10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2018

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                     to                     

Commission file number 1-5975

HUMANA INC.

(Exact name of registrant as specified in its charter)

Delaware	61-0647538
(State of incorporation)	(I.R.S. Employer Identification Number)
500 West Main Street Louisville, Kentucky	40202
(Address of principal executive offices)	(Zip Code)
Registrant’s telephone number, including area code: (502) 580-1000 Securities registered pursuant to Section 12(b) of the Act:
Title of each class	Name of exchange on which registered
Common stock, $0.16 2/3 par value	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  þ    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  þ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  þ    No  ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes  þ    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,”and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer   þ Accelerated filer  ¨   Non-accelerated filer  ¨ Smaller reporting company  ¨ Emerging growth company  ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  þ

The aggregate market value of voting stock held by non-affiliates of the Registrant as of June 30, 2018 was $41,129,697,151 calculated using the average price on June 30, 2018 of $299.02.

The number of shares outstanding of the Registrant’s Common Stock as of January 31, 2019 was 135,566,909.

DOCUMENTS INCORPORATED BY REFERENCE

Parts II and III incorporate herein by reference portions of the Registrant’s Proxy Statement to be filed pursuant to Regulation 14A with respect to the Annual Meeting of Stockholders scheduled to be held on April 18, 2019.

HUMANA INC.

INDEX TO ANNUAL REPORT ON FORM 10-K

For the Year Ended December 31, 2018

		Page
	Part I
Item 1.	Business	3
Item 1A.	Risk Factors	17
Item 1B.	Unresolved Staff Comments	31
Item 2.	Properties	32
Item 3.	Legal Proceedings	33
Item 4.	Mine Safety Disclosures	33
	Part II
Item 5.	Market for the Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	34
Item 6.	Selected Financial Data	37
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	38
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk	76
Item 8.	Financial Statements and Supplementary Data	78
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	136
Item 9A.	Controls and Procedures	136
Item 9B.	Other Information	137
	Part III
Item 10.	Directors, Executive Officers and Corporate Governance	138
Item 11.	Executive Compensation	141
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	141
Item 13.	Certain Relationships and Related Transactions, and Director Independence	142
Item 14.	Principal Accounting Fees and Services	142
	Part IV
Item 15.	Exhibits, Financial Statement Schedules	143
Item 16.	Form 10-K Summary	155
	Signatures and Certifications	156

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Forward-Looking Statements

Some of the statements under “Business,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and elsewhere in this report may contain forward-looking statements which reflect our current views with respect to future events and financial performance. These forward-looking statements are made within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, or the Exchange Act. We intend such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995, and we are including this statement for purposes of complying with these safe harbor provisions. We have based these forward-looking statements on our current expectations and projections about future events, trends and uncertainties. These forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties and assumptions, including the information discussed under the section entitled “Risk Factors” in this report. In making these statements, we are not undertaking to address or update them in future filings or communications regarding our business or results. Our business is highly complicated, regulated and competitive with many different factors affecting results.

PART I

ITEM 1. BUSINESS

General

Headquartered in Louisville, Kentucky, Humana Inc. and its subsidiaries, referred to throughout this document as “we,” “us,” “our,” the “Company” or “Humana,” is a leading health and well-being company committed to helping our millions of medical and specialty members achieve their best health. Our successful history in care delivery and health plan administration is helping us create a new kind of integrated care with the power to improve health and well‐being and lower costs. Our efforts are leading to a better quality of life for people with Medicare, families, individuals, military service personnel, and communities at large. To accomplish that, we support physicians and other health care professionals as they work to deliver the right care in the right place for their patients, our members. Our range of clinical capabilities, resources and tools, such as in‐home care, behavioral health, pharmacy services, data analytics and wellness solutions, combine to produce a simplified experience that makes health care easier to navigate and more effective.

As of December 31, 2018, we had approximately 17 million members in our medical benefit plans, as well as approximately 6 million members in our specialty products. During 2018, 81% of our total premiums and services revenue were derived from contracts with the federal government, including 15% derived from our individual Medicare Advantage contracts in Florida with the Centers for Medicare and Medicaid Services, or CMS, under which we provide health insurance coverage to approximately 636,800 members as of December 31, 2018.

Humana Inc. was organized as a Delaware corporation in 1964. Our principal executive offices are located at 500 West Main Street, Louisville, Kentucky 40202, the telephone number at that address is (502) 580-1000, and our website address is www.humana.com. We have made available free of charge through the Investor Relations section of our web site our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, proxy statements, and, if applicable, amendments to those reports filed or furnished pursuant to Section 13(a) of the Exchange Act, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission.

This Annual Report on Form 10-K, or 2018 Form 10-K, contains both historical and forward-looking information. See Item 1A. – Risk Factors in this 2018 Form 10-K for a description of a number of factors that may adversely affect our results or business.

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Business Segments

We manage our business with four reportable segments: Retail, Group and Specialty, Healthcare Services, and Individual Commercial. In addition, the Other Businesses category includes businesses that are not individually reportable because they do not meet the quantitative thresholds required by generally accepted accounting principles. These segments are based on a combination of the type of health plan customer and adjacent businesses centered on well-being solutions for our health plans and other customers, as described below. These segment groupings are consistent with information used by our Chief Executive Officer to assess performance and allocate resources. See Note 17 to the consolidated financial statements included in Item 8. - Financial Statements and Supplementary Data for segment financial information.

Our Products

Our medical and specialty insurance products allow members to access health care services primarily through our networks of health care providers with whom we have contracted. These products may vary in the degree to which members have coverage. Health maintenance organizations, or HMOs, include comprehensive managed care benefits generally through a participating network of physicians, hospitals, and other providers. Preferred provider organizations, or PPOs, provide members the freedom to choose any health care provider. However PPOs generally require the member to pay a greater portion of the provider’s fee in the event the member chooses not to use a provider participating in the PPO’s network. Point of Service, or POS, plans combine the advantages of HMO plans with the flexibility of PPO plans. In general, POS plans allow members to choose, at the time medical services are needed, to seek care from a provider within the plan’s network or outside the network. In addition, we offer services to our health plan members as well as to third parties that promote health and wellness, including pharmacy solutions, provider, and clinical programs, as well as services and capabilities to advance population health. At the core of our strategy is our integrated care delivery model, which unites quality care, high member engagement, and sophisticated data analytics. Three core elements of the model are to improve the consumer experience by simplifying the interaction with us, engaging members in clinical programs, and offering assistance to providers in transitioning from a fee-for-service to a value-based arrangement. Our approach to primary, physician-directed care for our members aims to provide quality care that is consistent, integrated, cost-effective, and member-focused. The model is designed to improve health outcomes and affordability for individuals and for the health system as a whole, while offering our members a simple, seamless healthcare experience. The discussion that follows describes the products offered by each of our segments.

Our Retail Segment Products

This segment is comprised of products sold on a retail basis to individuals including medical and supplemental benefit plans described in the discussion that follows. The following table presents our premiums and services revenue for the Retail segment by product for the year ended December 31, 2018:

	Retail Segment Premiums and Services Revenue		Percent of Consolidated Premiums  and Services Revenue
	(dollars in millions)
Premiums:
Individual Medicare Advantage	$	35,656	63.2	%
Group Medicare Advantage	6,103		10.8	%
Medicare stand-alone PDP	3,584		6.4	%
Total Retail Medicare	45,343		80.4	%
State-based Medicaid	2,255		4.0	%
Medicare Supplement	510		0.9	%
Total premiums	48,108		85.3	%
Services	11		—	%
Total premiums and services revenue	$	48,119	85.3	%

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Medicare

We have participated in the Medicare program for private health plans for over 30 years and have established a national presence, offering at least one type of Medicare plan in all 50 states. We have a geographically diverse membership base that we believe provides us with greater ability to expand our network of PPO and HMO providers. We employ strategies including health assessments and clinical guidance programs such as lifestyle and fitness programs for seniors to guide Medicare beneficiaries in making cost-effective decisions with respect to their health care. We believe these strategies result in cost savings that occur from making positive behavior changes.

Medicare is a federal program that provides persons age 65 and over and some disabled persons under the age of 65 certain hospital and medical insurance benefits. CMS, an agency of the United States Department of Health and Human Services, administers the Medicare program. Hospitalization benefits are provided under Part A, without the payment of any premium, for up to 90 days per incident of illness plus a lifetime reserve aggregating 60 days. Eligible beneficiaries are required to pay an annually adjusted premium to the federal government to be eligible for physician care and other services under Part B. Beneficiaries eligible for Part A and Part B coverage under traditional fee-for-service Medicare are still required to pay out-of-pocket deductibles and coinsurance. Throughout this document this program is referred to as Medicare FFS. As an alternative to Medicare FFS, in geographic areas where a managed care organization has contracted with CMS pursuant to the Medicare Advantage program, Medicare beneficiaries may choose to receive benefits from a Medicare Advantage organization under Medicare Part C. Pursuant to Medicare Part C, Medicare Advantage organizations contract with CMS to offer Medicare Advantage plans to provide benefits at least comparable to those offered under Medicare FFS. Our Medicare Advantage, or MA, plans are discussed more fully below. Prescription drug benefits are provided under Part D.

Individual Medicare Advantage Products

We contract with CMS under the Medicare Advantage program to provide a comprehensive array of health insurance benefits, including wellness programs, chronic care management, and care coordination, to Medicare eligible persons under HMO, PPO, and Private Fee-For-Service, or PFFS, plans in exchange for contractual payments received from CMS, usually a fixed payment per member per month. With each of these products, the beneficiary receives benefits in excess of Medicare FFS, typically including reduced cost sharing, enhanced prescription drug benefits, care coordination, data analysis techniques to help identify member needs, complex case management, tools to guide members in their health care decisions, care management programs, wellness and prevention programs and, in some instances, a reduced monthly Part B premium. Most Medicare Advantage plans offer the prescription drug benefit under Part D as part of the basic plan, subject to cost sharing and other limitations. Accordingly, all of the provisions of the Medicare Part D program described in connection with our stand-alone prescription drug plans in the following section also are applicable to most of our Medicare Advantage plans. Medicare Advantage plans may charge beneficiaries monthly premiums and other copayments for Medicare-covered services or for certain extra benefits. Generally, Medicare-eligible individuals enroll in one of our plan choices between October 15 and December 7 for coverage that begins on the following January 1.

Our Medicare HMO and PPO plans, which cover Medicare-eligible individuals residing in certain counties, may eliminate or reduce coinsurance or the level of deductibles on many other medical services while seeking care from participating in-network providers or in emergency situations. Except in emergency situations or as specified by the plan, most HMO plans provide no out-of-network benefits. PPO plans carry an out-of network benefit that is subject to higher member cost-sharing. In some cases, these beneficiaries are required to pay a monthly premium to the HMO or PPO plan in addition to the monthly Part B premium they are required to pay the Medicare program.

Most of our Medicare PFFS plans are network-based products with in and out of network benefits due to a requirement that Medicare Advantage organizations establish adequate provider networks, except in geographic areas that CMS determines have fewer than two network-based Medicare Advantage plans. In these areas, we offer Medicare PFFS plans that have no preferred network. Individuals in these plans pay us a monthly premium to receive typical Medicare Advantage benefits along with the freedom to choose any health care provider that accepts individuals at rates equivalent to Medicare FFS payment rates.

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CMS uses monthly rates per person for each county to determine the fixed monthly payments per member to pay to health benefit plans. These rates are adjusted under CMS’s risk-adjustment model which uses health status indicators, or risk scores, to improve the accuracy of payment. The risk-adjustment model, which CMS implemented pursuant to the Balanced Budget Act of 1997 (BBA) and the Benefits Improvement and Protection Act of 2000 (BIPA), generally pays more for members with predictably higher costs and uses principal hospital inpatient diagnoses as well as diagnosis data from ambulatory treatment settings (hospital outpatient department and physician visits) to establish the risk-adjustment payments. Under the risk-adjustment methodology, all health benefit organizations must collect from providers and submit the necessary diagnosis code information to CMS within prescribed deadlines. CMS is phasing-in the process of calculating risk scores using diagnoses data from the Risk Adjustment Processing System, or RAPS, to diagnoses data from the Encounter Data System, or EDS. The RAPS process requires MA plans to apply a filter logic based on CMS guidelines and only submit diagnoses that satisfy those guidelines. For submissions through EDS, CMS requires MA plans to submit all the encounter data and CMS will apply the risk adjustment filtering logic to determine the risk scores. For 2018, 15% of the risk score was calculated from claims data submitted through EDS. In 2019 and 2020 CMS will increase that percentage to 25% and 50%, respectively. For more information refer to Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data and Item 1A. - Risk Factors.

At December 31, 2018, we provided health insurance coverage under CMS contracts to approximately 3,064,000 individual Medicare Advantage members, including approximately 636,800 members in Florida. These Florida contracts accounted for premiums revenue of approximately $8.2 billion, which represented approximately 23.0% of our individual Medicare Advantage premiums revenue, or 14.6% of our consolidated premiums and services revenue for the year ended December 31, 2018.

Our HMO, PPO, and PFFS products covered under Medicare Advantage contracts with CMS are renewed generally for a calendar year term unless CMS notifies us of its decision not to renew by May 1 of the calendar year in which the contract would end, or we notify CMS of our decision not to renew by the first Monday in June of the calendar year in which the contract would end. All material contracts between Humana and CMS relating to our Medicare Advantage products have been renewed for 2019, and all of our product offerings filed with CMS for 2019 have been approved.

Individual Medicare Stand-Alone Prescription Drug Products

We offer stand-alone prescription drug plans, or PDPs, under Medicare Part D, including a PDP offering co-branded with Wal-Mart Stores, Inc., or the Humana-Walmart plan. Generally, Medicare-eligible individuals enroll in one of our plan choices between October 15 and December 7 for coverage that begins on the following January 1. Our stand-alone PDP offerings consist of plans offering basic coverage with benefits mandated by Congress, as well as plans providing enhanced coverage with varying degrees of out-of-pocket costs for premiums, deductibles, and co-insurance. Our revenues from CMS and the beneficiary are determined from our PDP bids submitted annually to CMS. These revenues also reflect the health status of the beneficiary and risk sharing provisions as more fully described in Note 2 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data, titled “Medicare Part D.” Our stand-alone PDP contracts with CMS are renewed generally for a calendar year term unless CMS notifies us of its decision not to renew by May 1 of the calendar year in which the contract would end, or we notify CMS of our decision not to renew by the first Monday in June of the calendar year in which the contract would end. All material contracts between Humana and CMS relating to our Medicare stand-alone PDP products have been renewed for 2019, and all of our product offerings filed with CMS for 2019 have been approved.

We have administered CMS’s Limited Income Newly Eligible Transition, or LI-NET, prescription drug plan program since 2010. This program allows individuals who receive Medicare’s low-income subsidy to also receive immediate prescription drug coverage at the point of sale if they are not already enrolled in a Medicare Part D plan. CMS temporarily enrolls newly identified individuals with both Medicare and Medicaid into the LI-NET prescription drug plan program, and subsequently transitions each member into a Medicare Part D plan that may or may not be a Humana Medicare plan.

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Group Medicare Advantage and Medicare stand-alone PDP

We offer products that enable employers that provide post-retirement health care benefits to replace Medicare wrap or Medicare supplement products with Medicare Advantage or stand-alone PDPs from Humana. These products offer the same types of benefits and services available to members in our individual Medicare plans discussed previously and can be tailored to closely match an employer’s post-retirement benefit structure.

State-based Medicaid Contracts

Our state-based contracts allow us to serve members enrolled in state-based Medicaid programs including Temporary Assistance to Needy Families, or TANF, Aged, Blind, and Disabled, or ABD, Long-Term Support Services, or LTSS, and the CMS Financial Alignment dual eligible demonstration programs. TANF and ABD programs are traditional Medicaid programs that are state and federally funded and provide cash assistance and supportive services to assist qualifying aged, blind, or disabled individuals, as well as families with children under age 18, helping them achieve economic self-sufficiency. LTSS is a state and federally funded program that offers states a broad and flexible set of program design options and refers to the delivery of long-term support services for our members who receive home and community or institution-based services for long-term care. Our contracts are generally for three to five year terms.

We have contracts to serve Medicaid eligible members in Florida and Kentucky under traditional programs, as well as contracts in Florida under the LTSS program. Our Kentucky Medicaid contract is subject to a 100% coinsurance contract with CareSource Management Group Company, ceding all the risk to CareSource.

Medicare beneficiaries who also qualify for Medicaid due to low income or special needs are known as dual eligible beneficiaries, or dual eligibles. The dual eligible population represents a disproportionate share of Medicaid and Medicare costs. States require special coordinating contracts for plans to offer Medicare Advantage dual eligible special needs plans, or D-SNPs. These largely operate separate from traditional Medicaid and LTSS programs. Some states are moving to support the dual eligible population by linking D-SNP participation to enrollment in a plan that also participates in a state-based Medicaid program to coordinate and integrate both Medicare and Medicaid benefits. Beginning in 2021, based on new federal requirements, D-SNPs will be required to more fully integrate Medicare and Medicaid benefits and states will have authority to require linkages to state-based traditional Medicaid and/or LTSS contracts or alternatively, allow D-SNPs to operate without a link to such state-based contracts while meeting additional coordination standards; CMS has yet to finalize regulations.

We currently serve dual eligible members under the CMS stand-alone dual eligible demonstration program in Illinois, and continue to serve other dual eligible members enrolled in our Medicare Advantage and stand-alone prescription drug plans.

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Our Group and Specialty Segment Products

The Group and Specialty segment consists of employer group commercial fully-insured medical and specialty health insurance benefits marketed to individuals and employer groups, including dental, vision and life insurance benefits, as well as administrative services only, or ASO products as described in the discussion that follows. The following table presents our premiums and services revenue for the Group and Specialty segment by product for the year ended December 31, 2018:

	Group and Specialty Segment Premiums and Services Revenue		Percent of Consolidated Premiums  and Services Revenue
	(dollars in millions)
External Revenue:
Premiums:
Fully-insured commercial group	$	5,444	9.7	%
Specialty	1,359		2.4	%
Total premiums	6,803		12.1	%
Services	835		1.5	%
Total premiums and services revenue	$	7,638	13.6	%
Intersegment services revenue	$	18	n/a

n/a – not applicable

Group Commercial Coverage

Our commercial products sold to employer groups include a broad spectrum of major medical benefits with multiple in-network coinsurance levels and annual deductible choices that employers of all sizes can offer to their employees on either a fully-insured, through HMO, PPO, or POS plans, or self-funded basis. Our plans integrate clinical programs, plan designs, communication tools, and spending accounts. We participate in the Federal Employee Health Benefits Program, or FEHBP, primarily with our HMO offering in certain markets. FEHBP is the government’s health insurance program for Federal employees, retirees, former employees, family members, and spouses.

Our administrative services only, or ASO, products are offered to employers who self-insure their employee health plans. We receive fees to provide administrative services which generally include the processing of claims, offering access to our provider networks and clinical programs, and responding to customer service inquiries from members of self-funded employers. These products may include all of the same benefit and product design characteristics of our fully-insured HMO, PPO, or POS products described previously. Under ASO contracts, self-funded employers generally retain the risk of financing substantially all of the cost of health benefits. However, substantially all of our ASO customers purchase stop loss insurance coverage from us to cover catastrophic claims or to limit aggregate annual costs.

Employers can customize their offerings with optional benefits such as dental, vision, and life products. We also offer optional benefits such as dental and vision to individuals.

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Military Services

Under our TRICARE contracts with the United States Department of Defense, or DoD, we provide administrative services to arrange health care services for the dependents of active duty military personnel and for retired military personnel and their dependents. We have participated in the TRICARE program since 1996 under contracts with the DoD. Under our contracts, we provide administrative services while the federal government retains all of the risk of the cost of health benefits. Accordingly, we account for revenues under the current contract net of estimated health care costs similar to an administrative services fee only agreement. On January 1, 2018, we began to deliver services under the T2017 East Region contract. The T2017 East Region contract is a consolidation of the former T3 North and South Regions, comprising thirty-two states and approximately 6 million TRICARE beneficiaries. The T2017 East Region contract is a 5-year contract set to expire on December 31, 2022 and is subject to renewals on January 1 of each year during its term at the government's option.

Our Healthcare Services Segment Products

The products offered by our Healthcare Services segment are key to our integrated care delivery model. This segment is comprised of stand-alone businesses that offer services including pharmacy solutions, provider services, clinical care services, and predictive modeling and informatics services to other Humana businesses, as well as external health plan members, external health plans, and other employers or individuals and are described in the discussion that follows. Our intersegment revenue is described in Note 17 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data. The following table presents our services revenue for the Healthcare Services segment by line of business for the year ended December 31, 2018:

	Healthcare  Services Segment Services Revenue		Percent of Consolidated Premiums  and Services Revenue
	(dollars in millions)
Intersegment revenue:
Pharmacy solutions	$	20,514	n/a
Provider services	1,994		n/a
Clinical care services	662		n/a
Total intersegment revenue	$	23,170
External services revenue:
Pharmacy solutions	$	203	0.4	%
Provider services	228		0.4	%
Clinical care services	176		0.3	%
Total external services revenue	$	607	1.1	%

n/a – not applicable

Pharmacy solutions

Humana Pharmacy Solutions^®, or HPS, manages traditional prescription drug coverage for both individuals and employer groups in addition to providing a broad array of pharmacy solutions. HPS also operates prescription mail order services for brand, generic, and specialty drugs and diabetic supplies through Humana Pharmacy, Inc.

Provider services

We operate full-service, multi-specialty medical centers in a number of states, primarily in Florida and Texas, staffed by primary care providers and medical specialists practicing cardiology, endocrinology, geriatric medicine, internal medicine, ophthalmology, neurology, and podiatry. Our care delivery subsidiaries operate our medical center business through both employed physicians and care providers, and through third party management service organizations with whom we contract to arrange for and manage certain clinical services.

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We also operate Transcend, a Medical Services Organization, or MSO, that coordinates medical care for Medicare Advantage beneficiaries primarily in four states. Transcend provides resources in care coordination, financial risk management, clinical integration and patient engagement that help physicians improve the patient experience as well as care outcomes. Transcend collaborates with physicians, medical groups and integrated delivery systems to successfully transition to value-based care by engaging, partnering and offering practical services and solutions. Transcend represents a key component of our integrated care delivery model which we believe is scalable to new markets.

During 2018, we acquired the remaining equity interest in MCCI Holdings, LLC, or MCCI, a privately held management service organization and healthcare provider headquartered in Miami, Florida, that primarily coordinates medical care for Medicare Advantage beneficiaries in Florida and Texas. In addition, during 2018, we acquired Family Physicians Group, or FPG, which serves Medicare Advantage and Managed Medicaid HMO patients in Greater Orlando, Florida with a footprint that includes clinics located in Lake, Orange, Osceola and Seminole counties. See Note 3 to the consolidated financial statements included in Item 8. - Financial Statements and Supplementary Data.

Clinical care services

Via in-home care, telephonic health counseling/coaching, and remote monitoring, we are actively involved in the care management of our customers with the greatest needs. Clinical care services include the operations of Humana At Home, Inc., or Humana At Home^®. As a chronic-care provider of in-home care for seniors, we provide innovative and holistic care coordination services for individuals living with multiple chronic conditions, individuals with disabilities, fragile and aging-in-place members and their care givers. We focus our deployment of these services in geographies with a high concentration of members living with multiple chronic conditions. The clinical support and care provided by Humana At Home is designed to improve health outcomes and result in a higher number of days members can spend at their homes instead of in an acute care facility. At December 31, 2018, we have enrolled approximately 716,000 members, with complex chronic conditions participating in a Humana Chronic Care Program,reflecting enhanced predictive modeling capabilities and focus on proactive clinical outreach and member engagement, particularly for our Medicare Advantage membership. These members may not be unique to each program since members have the ability to enroll in multiple programs. We believe these initiatives lead to better health outcomes for our members and lower health care costs.

We have committed additional investments in our home care capabilities with our acquisition of a 40% minority interest in Kindred at Home, Inc., or Kindred at Home, and Curo Health Services, or Curo, which combined creates the nation's largest home health and hospice provider with 65% overlap with our individual Medicare Advantage business. See Note 3 to the consolidated financial statements included in Item 8. - Financial Statements and Supplementary Data.

We are committed to the integrated physical and mental health of our members. Accordingly, we take a holistic approach to healthcare, offering care management and wellness programs. These programs use our capabilities that enable us to create a more complete view of an individual’s health, designed to connect, coordinate and simplify health care while reducing costs. These capabilities include our health care analytics engine, which reviews billions of clinical data points on millions of patients each day to provide members, providers, and payers real-time clinical insights to identify evidence-based gaps-in-care, drug safety alerts and other critical health concerns to improve outcomes. Additionally, our technology connects Humana and disparate electronic health record systems to enable the exchange of essential health information in real-time to provide physicians and care teams with a single, comprehensive patient view.

Our care management programs take full advantage of the population health, wellness and clinical applications offered by CareHub, our clinical management tool used by providers and care managers across the company to help our members achieve their best health, to offer various levels of support, matching the intensity of the support to the needs of members with ongoing health challenges through telephonic and onsite programs. These programs include Personal Nurse, chronic condition management, and case management as well as programs supporting maternity, cancer, neonatal intensive care unit, and transplant services.

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Wellness

We offer wellness solutions including our Go365 wellness and loyalty rewards program, employee assistance program, and clinical programs. These programs, when offered collectively to employer customers as our Total Health product, turn any standard plan of the employer's choosing into an integrated health and well-being solution that encourages participation in these programs.

Our Go365 program provides our members with access to a science-based, actuarially driven wellness and loyalty program that features a wide range of well-being tools and rewards that are customized to an individual’s needs and wants. A key element of the program includes a sophisticated health-behavior-change model supported by an incentive program.

Our Individual Commercial Segment Products

Our individual health plans were marketed under the HumanaOne brand. We offered products both on and off of the public exchange.

We discontinued substantially all off-exchange individual commercial medical plans effective January 1, 2017, and we exited our remaining individual commercial medical business effective January 1, 2018.

Other Businesses

Other Businesses includes those businesses that do not align with the reportable segments previously described, primarily our closed-block long-term care insurance policies, which was sold in 2018. For a detailed discussion of the sale refer to Note 3 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

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Membership

The following table summarizes our total medical membership at December 31, 2018, by market and product:

	Retail Segment					Group and Specialty Segment
	(in thousands)
	Individual Medicare Advantage	Group Medicare Advantage	Medicare stand- alone PDP	Medicare Supplement	State- based contracts	Fully- insured commercial Group	ASO	Military services	Total	Percent of Total
Florida	636.8	9.9	234.2	11.4	333.4	125.7	36.2	—	1,387.6	8.4	%
Texas	246.9	241.9	305.1	10.6	—	171.6	30.4	—	1,006.5	6.1	%
Kentucky	89.0	63.7	215.6	5.8	—	112.6	138.5	—	625.2	3.8	%
California	70.9	0.2	484.4	20.3	—	—	—	—	575.8	3.5	%
Georgia	114.2	2.2	124.5	11.1	—	158.5	45.2	—	455.7	2.7	%
Illinois	108.7	23.3	185.2	5.7	7.7	46.0	76.8	—	453.4	2.7	%
Ohio	128.6	22.1	184.3	45.8	—	44.6	27.5	—	452.9	2.7	%
Missouri/Kansas	82.5	4.9	227.2	9.1	—	45.0	17.4	—	386.1	2.3	%
North Carolina	149.5	0.5	172.6	6.0	—	—	—	—	328.6	2.0	%
Tennessee	144.3	4.3	117.2	4.9	—	41.4	12.9	—	325.0	2.0	%
Louisiana	161.1	12.1	61.3	2.2	—	59.6	13.5	—	309.8	1.9	%
Wisconsin	58.7	10.0	121.6	6.3	—	68.7	36.8	—	302.1	1.8	%
Indiana	103.5	6.8	145.8	9.0	—	21.2	12.6	—	298.9	1.8	%
Virginia	121.6	3.1	159.1	8.6	—	—	—	—	292.4	1.8	%
Michigan	52.9	12.9	140.2	3.4	—	2.8	0.4	—	212.6	1.3	%
Arizona	76.0	0.4	97.6	4.8	—	25.0	5.5	—	209.3	1.3	%
Pennsylvania	46.6	0.4	156.2	4.7	—	—	—	—	207.9	1.2	%
South Carolina	87.0	0.5	71.3	5.2	—	—	—	—	164.0	1.0	%
Military services	—	—	—	—	—	—	—	5,928.6	5,928.6	35.8	%
Others	585.2	78.6	1,800.9	79.4	—	82.0	28.2	—	2,654.3	15.9	%
Totals	3,064.0	497.8	5,004.3	254.3	341.1	1,004.7	481.9	5,928.6	16,576.7	100.0	%

Provider Arrangements

We provide our members with access to health care services through our networks of health care providers whom we employ or with whom we have contracted, including hospitals and other independent facilities such as outpatient surgery centers, primary care providers, specialist physicians, dentists, and providers of ancillary health care services and facilities. These ancillary services and facilities include laboratories, ambulance services, medical equipment services, home health agencies, mental health providers, rehabilitation facilities, nursing homes, optical services, and pharmacies. Our membership base and the ability to influence where our members seek care generally enable us to obtain contractual discounts with providers.

We use a variety of techniques to provide access to effective and efficient use of health care services for our members. These techniques include the coordination of care for our members, product and benefit designs, hospital inpatient management systems, the use of sophisticated analytics, and enrolling members into various care management programs. The focal point for health care services in many of our HMO networks is the primary care provider who, under contract with us, provides services to our members, and may control utilization of appropriate services by directing or approving hospitalization and referrals to specialists and other providers. Some physicians may have arrangements under which they can earn bonuses when certain target goals relating to the provision of quality patient care are met. We have available care management programs related to complex chronic conditions such as congestive heart failure and coronary artery disease. We also have programs for prenatal and premature infant care, asthma related illness, end stage renal disease, diabetes, cancer, and certain other conditions.

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We typically contract with hospitals on either (1) a per diem rate, which is an all-inclusive rate per day, (2) a case rate for diagnosis-related groups (DRG), which is an all-inclusive rate per admission, or (3) a discounted charge for inpatient hospital services. Outpatient hospital services generally are contracted at a flat rate by type of service, ambulatory payment classifications, or APCs, or at a discounted charge. APCs are similar to flat rates except multiple services and procedures may be aggregated into one fixed payment. These contracts are often multi-year agreements, with rates that are adjusted for inflation annually based on the consumer price index, other nationally recognized inflation indexes, or specific negotiations with the provider. Outpatient surgery centers and other ancillary providers typically are contracted at flat rates per service provided or are reimbursed based upon a nationally recognized fee schedule such as the Medicare allowable fee schedule.

Our contracts with physicians typically are renewed automatically each year, unless either party gives written notice, generally ranging from 90 to 120 days, to the other party of its intent to terminate the arrangement. Most of the physicians in our PPO networks and some of our physicians in our HMO networks are reimbursed based upon a fixed fee schedule, which typically provides for reimbursement based upon a percentage of the standard Medicare allowable fee schedule.

The terms of our contracts with hospitals and physicians may also vary between Medicare and commercial business. A significant portion of our Medicare network contracts, including those with both hospitals and physicians, are tied to Medicare reimbursement levels and methodologies.

Capitation

We offer providers a continuum of opportunities to increase the integration of care and offer assistance to providers in transitioning from a fee-for-service to a value-based arrangement. These include performance bonuses, shared savings and shared risk relationships. For some of our medical membership, we share risk with providers under capitation contracts where physicians and hospitals accept varying levels of financial risk for a defined set of membership, primarily HMO membership. Under the typical capitation arrangement, we prepay these providers a monthly fixed-fee per member, known as a capitation (per capita) payment, to cover all or a defined portion of the benefits provided to the capitated member.

We believe these risk-based models represent a key element of our integrated care delivery model at the core of our strategy. Our health plan subsidiaries may enter into these risk-based contracts with third party providers or our owned provider subsidiaries.

At December 31, 2018, approximately 1,128,500 members, or 6.8% of our medical membership, were covered under risk-based contracts, which provide all member benefits, including 942,000 individual Medicare Advantage members, or 30.7% of our total individual Medicare Advantage membership.

Physicians under capitation arrangements typically have stop loss coverage so that a physician’s financial risk for any single member is limited to a maximum amount on an annual basis. We typically process all claims and monitor the financial performance and solvency of our capitated providers. However, we delegated claim processing functions under capitation arrangements covering approximately 181,200 HMO members, including 168,900 individual Medicare Advantage members, or 17.9% of the 942,000 individual Medicare Advantage members covered under risk-based contracts at December 31, 2018, with the provider assuming substantially all the risk of coordinating the members’ health care benefits. Capitation expense under delegated arrangements for which we have a limited view of the underlying claims experience was approximately $1.5 billion, or 3.3% of total benefits expense, for the year ended December 31, 2018. We remain financially responsible for health care services to our members in the event our providers fail to provide such services.

Accreditation Assessment

Our accreditation assessment program consists of several internal programs, including those that credential providers and those designed to meet the audit standards of federal and state agencies as well as external accreditation standards. We also offer quality and outcome measurement and improvement programs such as the Health Care Effectiveness Data and Information Set, or HEDIS, which is used by employers, government purchasers and the National

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Committee for Quality Assurance (NCQA) to evaluate health plans based on various criteria, including effectiveness of care and member satisfaction.

Providers participating in our networks must satisfy specific criteria, including licensing, patient access, office standards, after-hours coverage, and other factors. Most participating hospitals also meet accreditation criteria established by CMS and/or The Joint Commission.

Recredentialing of participating providers occurs every three years, unless otherwise required by state or federal regulations. Recredentialing of participating providers includes verification of their medical licenses, review of their malpractice liability claims histories, review of their board certifications, if applicable, and review of applicable quality information. A committee composed of a peer group of providers reviews the applications of providers being considered for credentialing and recredentialing.

We maintain accreditation for certain of our health plans and/or departments from NCQA, the Accreditation Association for Ambulatory Health Care (AAAHC), and/or URAC. All Federal Employee Health Benefit Plans are required to be accredited. Certain commercial businesses, such as those impacted by a third-party labor agreement or those where a request is made by the employer, may require or prefer accredited health plans.

NCQA reviews our compliance based on standards for quality improvement, population health management, credentialing, utilization management, network management, member connections, and member rights and responsibilities. We have achieved and maintained NCQA accreditation in many of our commercial, Medicare and Medicaid HMO/POS and PPO markets and our wellness program, Go365. Humana’s pharmacy organization is accredited by URAC.

Sales and Marketing

We use various methods to market our products, including television, radio, the Internet, telemarketing, and direct mailings.

At December 31, 2018, we employed approximately 1,500 sales representatives, as well as approximately 1,400 telemarketing representatives who assisted in the marketing of Medicare, including Medicare Advantage and PDP, in our Retail segment and specialty products in our Group and Specialty segment, including making appointments for sales representatives with prospective members. We have a marketing arrangement with Wal-Mart Stores, Inc., or Wal-Mart, for our individual Medicare stand-alone PDP offering. We also sell group Medicare Advantage products through large employers. In addition, we market our Medicare and individual specialty products through licensed independent brokers and agents. For our Medicare products, commissions paid to employed sales representatives and independent brokers and agents are based on a per unit commission structure, regulated in structure and amount by CMS. For our individual specialty products, we generally pay brokers a commission based on premiums, with commissions varying by market and premium volume. In addition to a commission based directly on premium volume for sales to particular customers, we also have programs that pay brokers and agents based on other metrics. These include commission bonuses based on sales that attain certain levels or involve particular products. We also pay additional commissions based on aggregate volumes of sales involving multiple customers.

In our Group and Specialty segment, individuals may become members of our commercial HMOs and PPOs through their employers or other groups, which typically offer employees or members a selection of health insurance products, pay for all or part of the premiums, and make payroll deductions for any premiums payable by the employees. We attempt to become an employer’s or group’s exclusive source of health insurance benefits by offering a variety of HMO, PPO, and specialty products that provide cost-effective quality health care coverage consistent with the needs and expectations of their employees or members. We use licensed independent brokers, independent agents, digital insurance agencies, and employees to sell our group products. Many of our larger employer group customers are represented by insurance brokers and consultants who assist these groups in the design and purchase of health care products. We pay brokers and agents using the same commission structure described above for our specialty products.

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Underwriting

Since 2014, the Patient Protection and Affordability Care Act and The Health Care and Education Reconciliation Act of 2010, which we collectively refer to as the Health Care Reform Law, requires certain group health plans to guarantee issuance and renew coverage without pre-existing condition exclusions or health-status rating adjustments. Accordingly, certain group health plans are not subject to underwriting. Further, underwriting techniques are not employed in connection with our Medicare, military services, or Medicaid products because government regulations require us to accept all eligible applicants regardless of their health or prior medical history.

Competition

The health benefits industry is highly competitive. Our competitors vary by local market and include other managed care companies, national insurance companies, and other HMOs and PPOs. Many of our competitors have a larger membership base and/or greater financial resources than our health plans in the markets in which we compete. Our ability to sell our products and to retain customers may be influenced by such factors as those described in Item 1A. – Risk Factors in this 2018 Form 10-K.

Government Regulation

Diverse legislative and regulatory initiatives at both the federal and state levels continue to affect aspects of the nation’s health care system, including the Health Care Reform Law.

Our management works proactively to ensure compliance with all governmental laws and regulations affecting our business. We are unable to predict how existing federal or state laws and regulations may be changed or interpreted, what additional laws or regulations affecting our businesses may be enacted or proposed, when and which of the proposed laws will be adopted or what effect any such new laws and regulations will have on our results of operations, financial position, or cash flows.

For a description of certain material current activities in the federal and state legislative areas, see Item 1A. – Risk Factors in this 2018 Form 10-K.

Certain Other Services

Captive Insurance Company

We bear general business risks associated with operating our Company such as professional and general liability, employee workers’ compensation, cybersecurity, and officer and director errors and omissions risks. Professional and general liability risks may include, for example, medical malpractice claims and disputes with members regarding benefit coverage. We retain certain of these risks through our wholly-owned, captive insurance subsidiary. We reduce exposure to these risks by insuring levels of coverage for losses in excess of our retained limits with a number of third-party insurance companies. We remain liable in the event these insurance companies are unable to pay their portion of the losses.

Centralized Management Services

We provide centralized management services to each of our health plans and to our business segments from our headquarters and service centers. These services include management information systems, product development and administration, finance, human resources, accounting, law, public relations, marketing, insurance, purchasing, risk management, internal audit, actuarial, underwriting, claims processing, billing/enrollment, and customer service. Through intercompany service agreements approved, if required, by state regulatory authorities, Humana Inc., our parent company, charges a management fee for reimbursement of certain centralized services provided to its subsidiaries.

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Employees

As of December 31, 2018, we had approximately 41,600 employees and approximately 2,000 additional medical professionals working under management agreements primarily between us and affiliated physician-owned associations. We believe we have good relations with our employees and have not experienced any work stoppages.

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ITEM 1A. RISK FACTORS

Risks Relating to Our Business

If we do not design and price our products properly and competitively, if the premiums we charge are insufficient to cover the cost of health care services delivered to our members, if we are unable to implement clinical initiatives to provide a better health care experience for our members, lower costs and appropriately document the risk profile of our members, or if our estimates of benefits expense are inadequate, our profitability may be materially adversely affected. We estimate the costs of our benefits expense payments, and design and price our products accordingly, using actuarial methods and assumptions based upon, among other relevant factors, claim payment patterns, medical cost inflation, and historical developments such as claim inventory levels and claim receipt patterns. We continually review these estimates, however these estimates involve extensive judgment, and have considerable inherent variability because they are extremely sensitive to changes in claim payment patterns and medical cost trends. Any reserve, including a premium deficiency reserve, may be insufficient.

We use a substantial portion of our revenues to pay the costs of health care services delivered to our members. These costs include claims payments, capitation payments to providers (predetermined amounts paid to cover services), and various other costs incurred to provide health insurance coverage to our members. These costs also include estimates of future payments to hospitals and others for medical care provided to our members. Generally, premiums in the health care business are fixed for one-year periods. Accordingly, costs we incur in excess of our benefit cost projections generally are not recovered in the contract year through higher premiums. We estimate the costs of our future benefit claims and other expenses using actuarial methods and assumptions based upon claim payment patterns, medical inflation, historical developments, including claim inventory levels and claim receipt patterns, and other relevant factors. We also record benefits payable for future payments. We continually review estimates of future payments relating to benefit claims costs for services incurred in the current and prior periods and make necessary adjustments to our reserves, including premium deficiency reserves where appropriate. However, these estimates involve extensive judgment, and have considerable inherent variability that is sensitive to claim payment patterns and medical cost trends. Many factors may and often do cause actual health care costs to exceed what was estimated and used to set our premiums. These factors may include:

• increased use of medical facilities and services;

• increased cost of such services;

• increased use or cost of prescription drugs, including specialty prescription drugs;

• the introduction of new or costly treatments, including new technologies;

• our membership mix;

• variances in actual versus estimated levels of cost associated with new products, benefits or lines of business, product changes or benefit level changes;

• changes in the demographic characteristics of an account or market;

• changes or reductions of our utilization management functions such as preauthorization of services, concurrent review or requirements for physician referrals;

• changes in our pharmacy volume rebates received from drug manufacturers;

• catastrophes, including acts of terrorism, public health epidemics, or severe weather (e.g. hurricanes and earthquakes);

• medical cost inflation; and

• government mandated benefits or other regulatory changes, including any that result from the Health Care Reform Law.

Key to our operational strategy is the implementation of clinical initiatives that we believe provide a better health care experience for our members, lower the cost of healthcare services delivered to our members, and appropriately document the risk profile of our members. Our profitability and competitiveness depend in large part on our ability to

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appropriately manage health care costs through, among other things, the application of medical management programs such as our chronic care management program.

While we proactively attempt to effectively manage our operating expenses, increases or decreases in staff-related expenses, any costs associated with exiting products, additional investment in new products (including our opportunities in the Medicare programs, state-based contracts, and expansion of clinical capabilities as part of our integrated care delivery model), investments in health and well-being product offerings, acquisitions, new taxes and assessments (including the non-deductible health insurance industry fee), and implementation of regulatory requirements may increase our operating expenses.

Failure to adequately price our products or estimate sufficient benefits payable or effectively manage our operating expenses, may result in a material adverse effect on our results of operations, financial position, and cash flows.

We are in a highly competitive industry. Some of our competitors are more established in the health care industry in terms of a larger market share and have greater financial resources than we do in some markets. In addition, other companies may enter our markets in the future, including emerging competitors in the Medicare program or competitors in the delivery of health care services. We believe that barriers to entry in our markets are not substantial, so the addition of new competitors can occur relatively easily, and customers enjoy significant flexibility in moving between competitors. Contracts for the sale of commercial products are generally bid upon or renewed annually. While health plans compete on the basis of many factors, including service and the quality and depth of provider networks, we expect that price will continue to be a significant basis of competition. In addition to the challenge of controlling health care costs, we face intense competitive pressure to contain premium prices. Factors such as business consolidations, strategic alliances, legislative reform, and marketing practices create pressure to contain premium price increases, despite being faced with increasing medical costs.

The policies and decisions of the federal and state governments regarding the Medicare, military and Medicaid programs in which we participate have a substantial impact on our profitability. These governmental policies and decisions, which we cannot predict with certainty, directly shape the premiums or other revenues to us under the programs, the eligibility and enrollment of our members, the services we provide to our members, and our administrative, health care services, and other costs associated with these programs. Legislative or regulatory actions, such as those resulting in a reduction in premium payments to us, an increase in our cost of administrative and health care services, or additional fees, taxes or assessments, may have a material adverse effect on our results of operations, financial position, and cash flows.

Premium increases, introduction of new product designs, and our relationships with our providers in various markets, among other issues, could also affect our membership levels. Other actions that could affect membership levels include our possible exit from or entrance into Medicare or commercial markets, or the termination of a large contract.

If we do not compete effectively in our markets, if we set rates too high or too low in highly competitive markets to keep or increase our market share, if membership does not increase as we expect, if membership declines, or if we lose membership with favorable medical cost experience while retaining or increasing membership with unfavorable medical cost experience, our results of operations, financial position, and cash flows may be materially adversely affected.

If we fail to effectively implement our operational and strategic initiatives, including our Medicare initiatives and our state-based contracts strategy, our business may be materially adversely affected, which is of particular importance given the concentration of our revenues in these products. In addition, there can be no assurances that we will be successful in maintaining or improving our Star ratings in future years.

Our future performance depends in large part upon our ability to execute our strategy, including opportunities created by the expansion of our Medicare programs, the successful implementation of our integrated care delivery model and our strategy with respect to state-based contracts, including those covering members dually eligible for the Medicare and Medicaid programs.

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We have made substantial investments in the Medicare program to enhance our ability to participate in these programs. We have increased the size of our Medicare geographic reach through expanded Medicare product offerings. We offer both stand-alone Medicare prescription drug coverage and Medicare Advantage health plans with prescription drug coverage in addition to our other product offerings. We offer a Medicare prescription drug plan in 50 states as well as Puerto Rico and the District of Columbia. The growth of our Medicare products is an important part of our business strategy. Any failure to achieve this growth may have a material adverse effect on our results of operations, financial position, or cash flows. In addition, the expansion of our Medicare products in relation to our other businesses may intensify the risks to us inherent in Medicare products. There is significant concentration of our revenues in Medicare products, with approximately 80% of our total premiums and services revenue for the year ended December 31, 2018 generated from our Medicare products, including 15% derived from our individual Medicare Advantage contracts with CMS in Florida. These expansion efforts may result in less diversification of our revenue stream and increased risks associated with operating in a highly regulated industry, as discussed further below.

The Health Care Reform Law created a federal Medicare-Medicaid Coordination Office to serve dual eligibles. This Medicare-Medicaid Coordination Office has initiated a series of state demonstration projects to experiment with better coordination of care between Medicare and Medicaid. Depending upon the results of those demonstration projects, CMS may change the way in which dual eligibles are serviced. If we are unable to implement our strategic initiatives to address the dual eligibles opportunity, including our participation in state-based contracts, or if our initiatives are not successful at attracting or retaining dual eligible members, our business may be materially adversely affected.

The achievement of Star ratings of 4-Star or higher qualifies Medicare Advantage plans for premium bonuses. Our Medicare Advantage plans' operating results may be significantly affected by their star ratings. Despite our operational efforts to improve our star ratings, there can be no assurances that we will be successful in maintaining or improving our star ratings in future years. In addition, audits of our performance for past or future periods may result in downgrades to our Star ratings. Accordingly, our plans may not be eligible for full level quality bonuses, which could adversely affect the benefits such plans can offer, reduce membership and/or reduce profit margins.

If we fail to properly maintain the integrity of our data, to strategically implement new information systems, or to protect our proprietary rights to our systems, our business may be materially adversely affected.

Our business depends significantly on effective information systems and the integrity and timeliness of the data we use to run our business. Our business strategy involves providing members and providers with easy to use products that leverage our information to meet their needs. Our ability to adequately price our products and services, provide effective and efficient service to our customers, and to timely and accurately report our financial results depends significantly on the integrity of the data in our information systems. As a result of our past and on-going acquisition activities, we have acquired additional information systems. We have reduced the number of systems we operate, have upgraded and expanded our information systems capabilities, and are gradually migrating existing business to fewer systems. Our information systems require an ongoing commitment of significant resources to maintain, protect, and enhance existing systems and develop new systems to keep pace with continuing changes in information processing technology, evolving industry and regulatory standards, and changing customer preferences. If the information we rely upon to run our businesses was found to be inaccurate or unreliable or if we fail to maintain effectively our information systems and data integrity, we could have operational disruptions, have problems in determining medical cost estimates and establishing appropriate pricing, have customer and physician and other health care provider disputes, have regulatory or other legal problems, have increases in operating expenses, lose existing customers, have difficulty in attracting new customers, or suffer other adverse consequences.

We depend on independent third parties for significant portions of our systems-related support, equipment, facilities, and certain data, including data center operations, data network, voice communication services and pharmacy data processing. This dependence makes our operations vulnerable to such third parties' failure to perform adequately under the contract, due to internal or external factors. A change in service providers could result in a decline in service quality and effectiveness or less favorable contract terms which may adversely affect our operating results.

We rely on our agreements with customers, confidentiality agreements with employees, and our trade secrets and copyrights to protect our proprietary rights. These legal protections and precautions may not prevent misappropriation of our proprietary information. In addition, substantial litigation regarding intellectual property rights exists in the

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software industry, including litigation involving end users of software products. We expect software products to be increasingly subject to third-party infringement claims as the number of products and competitors in this area grows.

There can be no assurance that our information technology, or IT, process will successfully improve existing systems, develop new systems to support our expanding operations, integrate new systems, protect our proprietary information, defend against cybersecurity attacks, or improve service levels. In addition, there can be no assurance that additional systems issues will not arise in the future. Failure to adequately protect and maintain the integrity of our information systems and data, or to defend against cybersecurity attacks, may result in a material adverse effect on our results of operations, financial position, and cash flows.

If we are unable to defend our information technology security systems against cybersecurity attacks or prevent other privacy or data security incidents that result in security breaches that disrupt our operations or in the unintended dissemination of sensitive personal information or proprietary or confidential information, we could be exposed to significant regulatory fines or penalties, liability or reputational damage, or experience a material adverse effect on our results of operations, financial position, and cash flows.

In the ordinary course of our business, we process, store and transmit large amounts of data, including sensitive personal information as well as proprietary or confidential information relating to our business or a third-party. We have been, and will likely continue to be, regular targets of attempted cybersecurity attacks and other security threats and may be subject to breaches of our information technology security systems. Although the impact of such attacks has not been material to our operations or results of operations, financial position, or cash flow through December 31, 2018, we can provide no assurance that we will be able to detect, prevent, or contain the effects of such cybersecurity attacks or other information security risks or threats in the future. A cybersecurity attack may penetrate our layered security controls and misappropriate or compromise sensitive personal information or proprietary or confidential information or that of third-parties, create system disruptions, cause shutdowns, or deploy viruses, worms, and other malicious software programs that attack our systems. A cybersecurity attack that bypasses our IT security systems successfully could materially affect us due to the theft, destruction, loss, misappropriation or release of confidential data or intellectual property, operational or business delays resulting from the disruption of our IT systems, or negative publicity resulting in reputation or brand damage with our members, customers, providers, and other stakeholders. In certain circumstances we may rely on third party vendors to process, store and transmit large amounts of data for our businesses whose operations are subject to similar risks.

The costs to eliminate or address cybersecurity threats and vulnerabilities before or after an incident could be substantial. Our remediation efforts may not be successful and could result in interruptions, delays, or cessation of service, and loss of existing or potential members. In addition, breaches of our security measures and the unauthorized dissemination of sensitive personal information or proprietary or confidential information about us or our members or other third-parties, could expose our associates' or members’ private information and result in the risk of financial or medical identity theft, or expose us or other third-parties to a risk of loss or misuse of this information, result in significant regulatory fines or penalties, litigation and potential liability for us, damage our brand and reputation, or otherwise harm our business.

We are involved in various legal actions and governmental and internal investigations, any of which, if resolved unfavorably to us, could result in substantial monetary damages or changes in our business practices. Increased litigation and negative publicity could increase our cost of doing business.

We are or may become a party to a variety of legal actions that affect our business, including breach of contract actions, employment and employment discrimination-related suits, employee benefit claims, stockholder suits and other securities laws claims, and tort claims.

In addition, because of the nature of the health care business, we are subject to a variety of legal actions relating to our business operations, including the design, management, and offering of products and services. These include and could include in the future:

• claims relating to the methodologies for calculating premiums;

• claims relating to the denial of health care benefit payments;

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• claims relating to the denial or rescission of insurance coverage;

• challenges to the use of some software products used in administering claims;

• claims relating to our administration of our Medicare Part D offerings;

• medical malpractice actions based on our medical necessity decisions or brought against us on the theory that we are liable for providers' alleged malpractice;

• claims arising from any adverse medical consequences resulting from our recommendations about the appropriateness of providers’ proposed medical treatment plans for patients;

• allegations of anti-competitive and unfair business activities;

• provider disputes over compensation or non-acceptance or termination of provider contracts;

• disputes related to ASO business, including actions alleging claim administration errors;

• qui tam litigation brought by individuals who seek to sue on behalf of the government, alleging that we, as a government contractor, submitted false claims to the government including, among other allegations, resulting from coding and review practices under the Medicare risk-adjustment model;

• claims related to the failure to disclose some business practices;

• claims relating to customer audits and contract performance;

• claims relating to dispensing of drugs associated with our in-house mail-order pharmacy; and

• professional liability claims arising out of the delivery of healthcare and related services to the public.

In some cases, substantial non-economic or punitive damages as well as treble damages under the federal False Claims Act, Racketeer Influenced and Corrupt Organizations Act and other statutes may be sought.

While we currently have insurance coverage for some of these potential liabilities, other potential liabilities may not be covered by insurance, insurers may dispute coverage, or the amount of our insurance may not be enough to cover the damages awarded. In addition, some types of damages, like punitive damages, may not be covered by insurance. In some jurisdictions, coverage of punitive damages is prohibited. Insurance coverage for all or some forms of liability may become unavailable or prohibitively expensive in the future.

The health benefits industry continues to receive significant negative publicity reflecting the public perception of the industry. This publicity and perception have been accompanied by increased litigation, including some large jury awards, legislative activity, regulation, and governmental review of industry practices. These factors may materially adversely affect our ability to market our products or services, may require us to change our products or services or otherwise change our business practices, may increase the regulatory burdens under which we operate, and may require us to pay large judgments or fines. Any combination of these factors could further increase our cost of doing business and adversely affect our results of operations, financial position, and cash flows.

See "Legal Proceedings and Certain Regulatory Matters" in Note 16 to the consolidated financial statements included in Item 8. - Financial Statements and Supplementary Data. We cannot predict the outcome of these matters with certainty.

As a government contractor, we are exposed to risks that may materially adversely affect our business or our willingness or ability to participate in government health care programs.

A significant portion of our revenues relates to federal and state government health care coverage programs, including the Medicare, military, and Medicaid programs. These programs accounted for approximately 85% of our total premiums and services revenue for the year ended December 31, 2018. These programs involve various risks, as described further below.

• At December 31, 2018, under our contracts with CMS we provided health insurance coverage to approximately 636,800 individual Medicare Advantage members in Florida. These contracts accounted for

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approximately 15% of our total premiums and services revenue for the year ended December 31, 2018. The loss of these and other CMS contracts or significant changes in the Medicare program as a result of legislative or regulatory action, including reductions in premium payments to us or increases in member benefits without corresponding increases in premium payments to us, may have a material adverse effect on our results of operations, financial position, and cash flows.

• At December 31, 2018, our military services business, which accounted for approximately 1% of our total premiums and services revenue for the year ended December 31, 2018, primarily consisted of the TRICARE T2017 East Region contract replacing the 5-year T3 South Region contract that expired on December 31, 2017. The T2017 East Region contract is a consolidation of the former T3 North and South Regions, comprising thirty-two states and approximately 6 million TRICARE beneficiaries, under which delivery of health care services commenced on January 1, 2018. The T2017 East Region contract is a 5-year contract set to expire on December 31, 2022 and is subject to renewals on January 1 of each year during its term at the government's option. The loss of the TRICARE T2017 East Region contract may have a material adverse effect on our results of operations, financial position, and cash flows.

• There is a possibility of temporary or permanent suspension from participating in government health care programs, including Medicare and Medicaid, if we are convicted of fraud or other criminal conduct in the performance of a health care program or if there is an adverse decision against us under the federal False Claims Act. As a government contractor, we may be subject to qui tam litigation brought by individuals who seek to sue on behalf of the government, alleging that the government contractor submitted false claims to the government. Litigation of this nature is filed under seal to allow the government an opportunity to investigate and to decide if it wishes to intervene and assume control of the litigation. If the government does not intervene, the lawsuit is unsealed, and the individual may continue to prosecute the action on his or her own.

• CMS uses a risk-adjustment model which adjusts premiums paid to Medicare Advantage, or MA, plans according to health status of covered members. The risk-adjustment model, which CMS implemented pursuant to the Balanced Budget Act of 1997 (BBA) and the Benefits Improvement and Protection Act of 2000 (BIPA), generally pays more where a plan's membership has higher expected costs. Under this model, rates paid to MA plans are based on actuarially determined bids, which include a process whereby our prospective payments are based on our estimated cost of providing standard Medicare-covered benefits to an enrollee with a "national average risk profile." That baseline payment amount is adjusted to reflect the health status of our enrolled membership. Under the risk-adjustment methodology, all MA plans must collect and submit the necessary diagnosis code information from hospital inpatient, hospital outpatient, and physician providers to CMS within prescribed deadlines. The CMS risk-adjustment model uses the diagnosis data to calculate the risk-adjusted premium payment to MA plans, which CMS adjusts for coding pattern differences between the health plans and the government fee-for-service program. We generally rely on providers, including certain providers in our network who are our employees, to code their claim submissions with appropriate diagnoses, which we send to CMS as the basis for our payment received from CMS under the actuarial risk-adjustment model. We also rely on these providers to document appropriately all medical data, including the diagnosis data submitted with claims. In addition, we conduct medical record reviews as part of our data and payment accuracy compliance efforts, to more accurately reflect diagnosis conditions under the risk adjustment model. These compliance efforts include the internal contract level audits described in more detail below, as well as ordinary course reviews of our internal business processes.

CMS is phasing-in the process of calculating risk scores using diagnoses data from the Risk Adjustment Processing System, or RAPS, to diagnoses data from the Encounter Data System, or EDS. The RAPS process requires MA plans to apply a filter logic based on CMS guidelines and only submit diagnoses that satisfy those guidelines. For submissions through EDS, CMS requires MA plans to submit all the encounter data and CMS will apply the risk adjustment filtering logic to determine the risk scores. For 2018, 15% of the risk score was calculated from claims data submitted through EDS. In 2019 and 2020 CMS will increase that percentage to 25% and 50%, respectively.The phase-in from RAPS to EDS could result in different risk scores from each dataset as a result of plan processing issues, CMS processing issues, or filtering logic

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differences between RAPS and EDS, and could have a material adverse effect on our results of operations, financial position, or cash flows.

CMS and the Office of the Inspector General of Health and Human Services, or HHS-OIG, are continuing to perform audits of various companies’ selected MA contracts related to this risk adjustment diagnosis data. We refer to these audits as Risk-Adjustment Data Validation Audits, or RADV audits. RADV audits review medical records in an attempt to validate provider medical record documentation and coding practices which influence the calculation of premium payments to MA plans.

In 2012, CMS released a “Notice of Final Payment Error Calculation Methodology for Part C Medicare Advantage Risk Adjustment Data Validation (RADV) Contract-Level Audits.” The payment error calculation methodology provided that, in calculating the economic impact of audit results for an MA contract, if any, the results of the RADV audit sample would be extrapolated to the entire MA contract after a comparison of the audit results to a similar audit of Medicare FFS (we refer to the process of accounting for errors in FFS claims as the "FFS Adjuster"). This comparison of RADV audit results to the FFS error rate is necessary to determine the economic impact, if any, of RADV audit results because the government used the Medicare FFS program data set, including any attendant errors that are present in that data set, to estimate the costs of various health status conditions and to set the resulting adjustments to MA plans’ payment rates in order to establish actuarial equivalence in payment rates as required under the Medicare statute. CMS already makes other adjustments to payment rates based on a comparison of coding pattern differences between MA plans and Medicare FFS data (such as for frequency of coding for certain diagnoses in MA plan data versus the Medicare FFS program dataset).

The final RADV extrapolation methodology, including the first application of extrapolated audit results to determine audit settlements, is expected to be applied to CMS RADV contract level audits conducted for contract year 2011 and subsequent years. CMS is currently conducting RADV contract level audits for certain of our Medicare Advantage plans.

Estimated audit settlements are recorded as a reduction of premiums revenue in our consolidated statements of income, based upon available information. We perform internal contract level audits based on the RADV audit methodology prescribed by CMS. Included in these internal contract level audits is an audit of our Private Fee-For Service business which we used to represent a proxy of the FFS Adjuster which has not yet been finalized. We based our accrual of estimated audit settlements for each contract year on the results of these internal contract level audits and update our estimates as each audit is completed. Estimates derived from these results were not material to our results of operations, financial position, or cash flows. We report the results of these internal contract level audits to CMS, including identified overpayments, if any.

On October 26, 2018, CMS issued a proposed rule and accompanying materials (which we refer to as the “Proposed Rule”) related to, among other things, the RADV audit methodology described above. If implemented, the Proposed Rule would use extrapolation in RADV audits applicable to payment year 2011 contract-level audits and all subsequent audits, without the application of a FFS Adjuster to audit findings. We are studying the Proposed Rule and CMS’ underlying analysis contained therein. We believe, however, that the Proposed Rule fails to address adequately the statutory requirement of actuarial equivalence, and we expect to provide substantive comments to CMS on the Proposed Rule as part of the notice-and-comment rulemaking process. We are also evaluating the potential impact of the Proposed Rule, and any related regulatory, industry or company reactions, all or any of which could have a material adverse effect on our results of operations, financial position, or cash flows.

In addition, as part of our internal compliance efforts, we routinely perform ordinary course reviews of our internal business processes related to, among other things, our risk coding and data submissions in connection with the risk- adjustment model. These reviews may also result in the identification of errors and the submission of corrections to CMS, that may, either individually or in the aggregate, be material. As such, the result of these reviews may have a material adverse effect on our results of operations, financial position, or cash flows.

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We believe that CMS' statements and policies regarding the requirement to report and return identified overpayments received by MA plans are inconsistent with CMS' 2012 RADV audit methodology, and the Medicare statute's requirements. These statements and policies, such as certain statements contained in the preamble to CMS’ final rule release regarding Medicare Advantage and Part D prescription drug benefit program regulations for Contract Year 2015 (which we refer to as the "Overpayment Rule"), and the Proposed Rule, appear to equate each Medicare Advantage risk adjustment data error with an “overpayment” without addressing the principles underlying the FFS Adjuster referenced above. On September 7, 2018, the Federal District Court for the District of Columbia vacated CMS's Overpayment Rule, concluding that it violated the Medicare statute, including the requirement for actuarial equivalence, and that the Overpayment Rule was also arbitrary and capricious in departing from CMS's RADV methodology without adequate explanation (among other reasons). CMS has filed a motion for reconsideration related to certain aspects of the Federal District Court's opinion and has simultaneously filed a notice to appeal the decision to the Circuit Court of Appeals.

We will continue to work with CMS to ensure that MA plans are paid accurately and that payment model principles are in accordance with the requirements of the Social Security Act, which, if not implemented correctly could have a material adverse effect on our results of operations, financial position, or cash flows.

• Our CMS contracts which cover members’ prescription drugs under Medicare Part D contain provisions for risk sharing and certain payments for prescription drug costs for which we are not at risk. These provisions, certain of which are described below, affect our ultimate payments from CMS.

The premiums from CMS are subject to risk corridor provisions which compare costs targeted in our annual bids to actual prescription drug costs, limited to actual costs that would have been incurred under the standard coverage as defined by CMS. Variances exceeding certain thresholds may result in CMS making additional payments to us or require us to refund to CMS a portion of the premiums we received (known as a “risk corridor”). We estimate and recognize an adjustment to premiums revenue related to the risk corridor payment settlement based upon pharmacy claims experience. The estimate of the settlement associated with these risk corridor provisions requires us to consider factors that may not be certain, including member eligibility differences with CMS. Our estimate of the settlement associated with the Medicare Part D risk corridor provisions was a net payable of $170 million and $279 million at December 31, 2018 and 2017, respectively.

Reinsurance and low-income cost subsidies represent payments from CMS in connection with the Medicare Part D program for which we assume no risk. Reinsurance subsidies represent payments for CMS’s portion of claims costs which exceed the member’s out-of-pocket threshold, or the catastrophic coverage level. Low-income cost subsidies represent payments from CMS for all or a portion of the deductible, the coinsurance and co-payment amounts above the out-of-pocket threshold for low-income beneficiaries. Monthly prospective payments from CMS for reinsurance and low-income cost subsidies are based on assumptions submitted with our annual bid. A reconciliation and settlement of CMS’s prospective subsidies against actual prescription drug costs we paid is made after the end of the applicable year.

Settlement of the reinsurance and low-income cost subsidies as well as the risk corridor payment is based on a reconciliation made approximately9months after the close of each calendar year. This reconciliation process requires us to submit claims data necessary for CMS to administer the program. Our claims data may not pass CMS’s claims edit processes due to various reasons, including discrepancies in eligibility or classification of low-income members. To the extent our data does not pass CMS’s claim edit processes, we may bear the risk for all or a portion of the claim which otherwise may have been subject to the risk corridor provision or payment which we would have otherwise received as a low-income subsidy or reinsurance claim. In addition, in the event the settlement represents an amount CMS owes us, there is a negative impact on our cash flows and financial condition as a result of financing CMS’s share of the risk. The opposite is true in the event the settlement represents an amount we owe CMS.

• We are also subject to various other governmental audits and investigations. Under state laws, our HMOs and health insurance companies are audited by state departments of insurance for financial and contractual compliance. Our HMOs are audited for compliance with health services by state departments of health. Audits and investigations, including audits of risk adjustment data, are also conducted by state attorneys

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general, CMS, HHS-OIG, the Office of Personnel Management, the Department of Justice, the Department of Labor, and the Defense Contract Audit Agency. All of these activities could result in the loss of licensure or the right to participate in various programs, including a limitation on our ability to market or sell products, the imposition of fines, penalties and other civil and criminal sanctions, or changes in our business practices. The outcome of any current or future governmental or internal investigations cannot be accurately predicted, nor can we predict any resulting penalties, fines or other sanctions that may be imposed at the discretion of federal or state regulatory authorities. Nevertheless, it is reasonably possible that any such outcome of litigation, penalties, fines or other sanctions could be substantial, and the outcome of these matters may have a material adverse effect on our results of operations, financial position, and cash flows. Certain of these matters could also affect our reputation. In addition, disclosure of any adverse investigation or audit results or sanctions could negatively affect our industry or our reputation in various markets and make it more difficult for us to sell our products and services.

The Health Care Reform Law could have a material adverse effect on our results of operations (including restricting revenue, enrollment and premium growth in certain products and market segments, restricting our ability to expand into new markets, increasing our medical and operating costs by, among other things, requiring a minimum benefit ratio on insured products, lowering our Medicare payment rates and increasing our expenses associated with a non-deductible health insurance industry fee and other assessments); our financial position (including our ability to maintain the value of our goodwill); and our cash flows.

The Patient Protection and Affordable Care Act and The Health Care and Education Reconciliation Act of 2010 (which we collectively refer to as the Health Care Reform Law) enacted significant reforms to various aspects of the U.S. health insurance industry. The provisions of the Health Care Reform Law include, among others, imposing a significant new non-deductible health insurance industry fee and other assessments on health insurers, limiting Medicare Advantage payment rates, stipulating a prescribed minimum ratio for the amount of premiums revenue to be expended on medical costs for insured products, additional mandated benefits and guarantee issuance associated with commercial medical insurance, requirements that limit the ability of health plans to vary premiums based on assessments of underlying risk, and heightened scrutiny by state and federal regulators of our business practices, including our Medicare bid and pricing practices. The Health Care Reform Law also specifies benefit design guidelines, limits rating and pricing practices, encourages additional competition (including potential incentives for new market entrants), establishes federally-facilitated or state-based exchanges for individuals and small employers (with up to 100 employees) coupled with programs designed to spread risk among insurers (subject to federal administrative action), and expands eligibility for Medicaid programs (subject to state-by-state implementation of this expansion). Financing for these reforms come, in part, from material additional fees and taxes on us and other health plans and individuals which began in 2014, as well as reductions in certain levels of payments to us and other health plans under Medicare. If we fail to effectively implement our operational and strategic initiatives with respect to the implementation of the Health Care Reform Law, our business may be materially adversely affected. Additionally, potential legislative changes or judicial determinations, including activities to repeal or replace the Health Care Reform Law or declare all or certain portions of the Health Care Reform Law unconstitutional, creates uncertainty for our business, and we cannot predict when, or in what form, such legislative changes or judicial determinations may occur.

For additional information, please refer to the section entitled, “Health Care Reform” in “Item 7 - Management’s Discussion and Analysis of Financial Condition and Results of Operations” appearing in this annual report.

Our business activities are subject to substantial government regulation. New laws or regulations, or changes in existing laws or regulations or their manner of application, including reductions in Medicare Advantage payment rates, could increase our cost of doing business and may adversely affect our business, profitability, financial condition, and cash flows.

In addition to the Health Care Reform Law, the health care industry in general and health insurance are subject to substantial federal and state government regulation:

Health Insurance Portability and Accountability Act (HIPAA) and the Health Information Technology for Economic and Clinical Health Act (HITECH Act)

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The use of individually identifiable health data by our business is regulated at federal and state levels. These laws and rules are changed frequently by legislation or administrative interpretation. Various state laws address the use and maintenance of individually identifiable health data. Most are derived from the privacy provisions in the federal Gramm-Leach-Bliley Act and the Health Insurance Portability and Accountability Act, or HIPAA. HIPAA includes administrative provisions directed at simplifying electronic data interchange through standardizing transactions, establishing uniform health care provider, payer, and employer identifiers, and seeking protections for confidentiality and security of patient data. The rules do not provide for complete federal preemption of state laws, but rather preempt all inconsistent state laws unless the state law is more stringent.

These regulations set standards for the security of electronic health information, including requirements that insurers provide customers with notice regarding how their non-public personal information is used, including an opportunity to "opt out" of certain disclosures. Violations of these rules could subject us to significant criminal and civil penalties, including significant monetary penalties. Compliance with HIPAA regulations requires significant systems enhancements, training and administrative effort. HIPAA can also expose us to additional liability for violations by our business associates (e.g., entities that provide services to health plans and providers).

The HITECH Act, one part of the American Recovery and Reinvestment Act of 2009, significantly broadened the scope of the privacy and security regulations of HIPAA. Among other requirements, the HITECH Act and HIPAA mandate individual notification in the event of a breach of unsecured, individually identifiable health information, provides enhanced penalties for HIPAA violations, requires business associates to comply with certain provisions of the HIPAA privacy and security rule, and grants enforcement authority to state attorneys general in addition to the HHS Office of Civil Rights.

In addition, there are numerous federal and state laws and regulations addressing patient and consumer privacy concerns, including unauthorized access or theft of personal information. State statutes and regulations vary from state to state and could impose additional penalties. Violations of HIPAA or applicable federal or state laws or regulations could subject us to significant criminal or civil penalties, including significant monetary penalties. Compliance with HIPAA and other privacy regulations requires significant systems enhancements, training and administrative effort.

American Recovery and Reinvestment Act of 2009 (ARRA)

On February 17, 2009, the American Recovery and Reinvestment Act of 2009, or ARRA, was enacted into law. In addition to including a temporary subsidy for health care continuation coverage issued pursuant to the Consolidated Omnibus Budget Reconciliation Act, or COBRA, ARRA also expands and strengthens the privacy and security provisions of HIPAA and imposes additional limits on the use and disclosure of protected health information, or PHI. Among other things, ARRA requires us and other covered entities to report any unauthorized release or use of or access to PHI to any impacted individuals and to HHS in those instances where the unauthorized activity poses a significant risk of financial, reputational or other harm to the individuals, and to notify the media in any states where 500 or more people are impacted by any unauthorized release or use of or access to PHI. ARRA also requires business associates to comply with certain HIPAA provisions. ARRA also establishes higher civil and criminal penalties for covered entities and business associates who fail to comply with HIPAA’s provisions and requires HHS to issue regulations implementing its privacy and security enhancements. 

Corporate Practice of Medicine and Other Laws

As a corporate entity, Humana Inc. is not licensed to practice medicine. Many states in which we operate through our subsidiaries limit the practice of medicine to licensed individuals or professional organizations comprised of licensed individuals, and business corporations generally may not exercise control over the medical decisions of physicians. Statutes and regulations relating to the practice of medicine, fee-splitting between physicians and referral sources, and similar issues vary widely from state to state. Under management agreements between certain of our subsidiaries and affiliated physician-owned professional groups, these groups retain sole responsibility for all medical decisions, as well as for hiring and managing physicians and other licensed healthcare providers, developing operating policies and procedures, implementing professional standards and controls, and maintaining malpractice insurance. We believe that our health services operations comply with applicable state statutes regarding corporate practice of medicine, fee-

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splitting, and similar issues. However, any enforcement actions by governmental officials alleging non-compliance with these statutes, which could subject us to penalties or restructuring or reorganization of our business, may result in a material adverse effect on our results of operations, financial position, or cash flows.

Anti-Kickback, Physician Self-Referral, and Other Fraud and Abuse Laws

A federal law commonly referred to as the “Anti-Kickback Statute” prohibits the offer, payment, solicitation, or receipt of any form of remuneration to induce, or in return for, the referral of Medicare or other governmental health program patients or patient care opportunities, or in return for the purchase, lease, or order of items or services that are covered by Medicare or other federal governmental health programs. Because the prohibitions contained in the Anti-Kickback Statute apply to the furnishing of items or services for which payment is made in “whole or in part,” the Anti-Kickback Statute could be implicated if any portion of an item or service we provide is covered by any of the state or federal health benefit programs described above. Violation of these provisions constitutes a felony criminal offense and applicable sanctions could include exclusion from the Medicare and Medicaid programs.

Section 1877 of the Social Security Act, commonly known as the “Stark Law,” prohibits physicians, subject to certain exceptions described below, from referring Medicare or Medicaid patients to an entity providing “designated health services” in which the physician, or an immediate family member, has an ownership or investment interest or with which the physician, or an immediate family member, has entered into a compensation arrangement. These prohibitions, contained in the Omnibus Budget Reconciliation Act of 1993, commonly known as “Stark II,” amended prior federal physician self-referral legislation known as “Stark I” by expanding the list of designated health services to a total of 11 categories of health services. The professional groups with which we are affiliated provide one or more of these designated health services. Persons or entities found to be in violation of the Stark Law are subject to denial of payment for services furnished pursuant to an improper referral, civil monetary penalties, and exclusion from the Medicare and Medicaid programs.

Many states also have enacted laws similar in scope and purpose to the Anti-Kickback Statute and, in more limited instances, the Stark Law, that are not limited to services for which Medicare or Medicaid payment is made. In addition, most states have statutes, regulations, or professional codes that restrict a physician from accepting various kinds of remuneration in exchange for making referrals. These laws vary from state to state and have seldom been interpreted by the courts or regulatory agencies. In states that have enacted these statutes, we believe that regulatory authorities and state courts interpreting these statutes may regard federal law under the Anti-Kickback Statute and the Stark Law as persuasive.

We believe that our operations comply with the Anti-Kickback Statute, the Stark Law, and similar federal or state laws addressing fraud and abuse. These laws are subject to modification and changes in interpretation, and are enforced by authorities vested with broad discretion. We continually monitor developments in this area. If these laws are interpreted in a manner contrary to our interpretation or are reinterpreted or amended, or if new legislation is enacted with respect to healthcare fraud and abuse, illegal remuneration, or similar issues, we may be required to restructure our affected operations to maintain compliance with applicable law. There can be no assurances that any such restructuring will be possible or, if possible, would not have a material adverse effect on our results of operations, financial position, or cash flows.

Environmental

We are subject to various federal, state, and local laws and regulations relating to the protection of human health and the environment. If an environmental regulatory agency finds any of our facilities to be in violation of environmental laws, penalties and fines may be imposed for each day of violation and the affected facility could be forced to cease operations. We could also incur other significant costs, such as cleanup costs or claims by third parties, as a result of violations of, or liabilities under, environmental laws. Although we believe that our environmental practices, including waste handling and disposal practices, are in material compliance with applicable laws, future claims or violations, or changes in environmental laws, could have a material adverse effect on our results of operations, financial position or cash flows.

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State Regulation of Insurance-Related Products

Laws in each of the states (and Puerto Rico) in which we operate our HMOs, PPOs and other health insurance-related services regulate our operations including: capital adequacy and other licensing requirements, policy language describing benefits, mandated benefits and processes, entry, withdrawal or re-entry into a state or market, rate increases, delivery systems, utilization review procedures, quality assurance, complaint systems, enrollment requirements, claim payments, marketing, and advertising. The HMO, PPO, and other health insurance-related products we offer are sold under licenses issued by the applicable insurance regulators.

Our licensed insurance subsidiaries are also subject to regulation under state insurance holding company and Puerto Rico regulations. These regulations generally require, among other things, prior approval and/or notice of new products, rates, benefit changes, and certain material transactions, including dividend payments, purchases or sales of assets, intercompany agreements, and the filing of various financial and operational reports.

Any failure by us to manage acquisitions, divestitures and other significant transactions successfully may have a material adverse effect on our results of operations, financial position, and cash flows.

As part of our business strategy, we frequently engage in discussions with third parties regarding possible investments, acquisitions, divestitures, strategic alliances, joint ventures, and outsourcing transactions and often enter into agreements relating to such transactions in order to further our business objectives. In order to pursue our acquisition strategy successfully, we must identify suitable candidates for and successfully complete transactions, some of which may be large and complex, and manage post-closing issues such as the integration of acquired companies or employees. Integration and other risks can be more pronounced for larger and more complicated transactions, transactions outside of our core business space, or if multiple transactions are pursued simultaneously. The failure to successfully integrate acquired entities and businesses or failure to produce results consistent with the financial model used in the analysis of our acquisitions, investments, joint ventures or strategic alliances may cause asset write-offs, restructuring costs or other expenses and may have a material adverse effect on our results of operations, financial position, and cash flows. If we fail to identify and complete successfully transactions that further our strategic objectives, we may be required to expend resources to develop products and technology internally. In addition, from time to time, we evaluate alternatives for our businesses that do not meet our strategic, growth or profitability objectives, and we may divest or wind down such businesses. There can be no assurance that we will be able to complete any such divestiture on terms favorable to us. The divestiture of certain businesses could result, individually or in the aggregate, in the recognition of material losses and a material adverse effect on our results of operations. In addition, divestitures may result in continued financial exposure to the divested businesses following the completion of the transaction. For example, in connection with a disposition, we may enter into transition or administrative service agreements, coinsurance arrangements, vendor relationships or other strategic relationships with the divested business, or we may agree to provide certain indemnities to the purchaser in any such transaction, each of which may result in additional expense and could have a material adverse effect on our result of operations.

If we fail to develop and maintain satisfactory relationships with the providers of care to our members, our business may be adversely affected.

We employ or contract with physicians, hospitals and other providers to deliver health care to our members. Our products encourage or require our customers to use these contracted providers. A key component of our integrated care delivery strategy is to increase the number of providers who share medical cost risk with us or have financial incentives to deliver quality medical services in a cost-effective manner.

In any particular market, providers could refuse to contract with us, demand higher payments, or take other actions that could result in higher health care costs for us, less desirable products for customers and members or difficulty meeting regulatory or accreditation requirements. In some markets, some providers, particularly hospitals, physician specialty groups, physician/hospital organizations, or multi-specialty physician groups, may have significant market positions and negotiating power. In addition, physician or practice management companies, which aggregate physician practices for administrative efficiency and marketing leverage, may compete directly with us. If these providers refuse to contract with us, use their market position to negotiate unfavorable contracts with us or place us at a competitive

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disadvantage, or do not enter into contracts with us that encourage the delivery of quality medical services in a cost-effective manner, our ability to market products or to be profitable in those areas may be adversely affected.

In some situations, we have contracts with individual or groups of primary care providers for an actuarially determined, fixed fee per month to provide a basket of required medical services to our members. This type of contract is referred to as a “capitation” contract. The inability of providers to properly manage costs under these capitation arrangements can result in the financial instability of these providers and the termination of their relationship with us. In addition, payment or other disputes between a primary care provider and specialists with whom the primary care provider contracts can result in a disruption in the provision of services to our members or a reduction in the services available to our members. The financial instability or failure of a primary care provider to pay other providers for services rendered could lead those other providers to demand payment from us even though we have made our regular fixed payments to the primary provider. There can be no assurance that providers with whom we contract will properly manage the costs of services, maintain financial solvency or avoid disputes with other providers. Any of these events may have a material adverse effect on the provision of services to our members and our results of operations, financial position, and cash flows.

Our pharmacy business is highly competitive and subjects us to regulations in addition to those we face with our core health benefits businesses.

Our pharmacy mail order business competes with locally owned drugstores, retail drugstore chains, supermarkets, discount retailers, membership clubs, internet companies and other mail-order and long-term care pharmacies. Our pharmacy business also subjects us to extensive federal, state, and local regulation. The practice of pharmacy is generally regulated at the state level by state boards of pharmacy. Many of the states where we deliver pharmaceuticals, including controlled substances, have laws and regulations that require out-of-state mail-order pharmacies to register with that state’s board of pharmacy. Federal agencies further regulate our pharmacy operations, requiring registration with the U.S. Drug Enforcement Administration and individual state controlled substance authorities in order to dispense controlled substances. In addition, the FDA inspects facilities in connection with procedures to effect recalls of prescription drugs. The Federal Trade Commission also has requirements for mail-order sellers of goods. The U.S. Postal Service, or USPS, has statutory authority to restrict the transmission of drugs and medicines through the mail to a degree that may have an adverse effect on our mail-order operations. The USPS historically has exercised this statutory authority only with respect to controlled substances. If the USPS restricts our ability to deliver drugs through the mail, alternative means of delivery are available to us. However, alternative means of delivery could be significantly more expensive. The U.S. Department of Transportation has regulatory authority to impose restrictions on drugs inserted in the stream of commerce. These regulations generally do not apply to the USPS and its operations. In addition, we are subject to CMS rules regarding the administration of our PDP plans and intercompany pricing between our PDP plans and our pharmacy business.

We are also subject to risks inherent in the packaging and distribution of pharmaceuticals and other health care products, and the application of state laws related to the operation of internet and mail-order pharmacies. The failure to adhere to these laws and regulations may expose us to civil and criminal penalties.

Changes in the prescription drug industry pricing benchmarks may adversely affect our financial performance.

Contracts in the prescription drug industry generally use certain published benchmarks to establish pricing for prescription drugs. These benchmarks include average wholesale price, which is referred to as “AWP,” average selling price, which is referred to as “ASP,” and wholesale acquisition cost. It is uncertain whether payors, pharmacy providers, pharmacy benefit managers, or PBMs, and others in the prescription drug industry will continue to utilize AWP as it has previously been calculated, or whether other pricing benchmarks will be adopted for establishing prices within the industry. Legislation may lead to changes in the pricing for Medicare and Medicaid programs. Regulators have conducted investigations into the use of AWP for federal program payment, and whether the use of AWP has inflated drug expenditures by the Medicare and Medicaid programs. Federal and state proposals have sought to change the basis for calculating payment of certain drugs by the Medicare and Medicaid programs. Adoption of ASP in lieu of AWP as the measure for determining payment by Medicare or Medicaid programs for the drugs sold in our mail-order pharmacy

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business may reduce the revenues and gross margins of this business which may result in a material adverse effect on our results of operations, financial position, and cash flows.

If we do not continue to earn and retain purchase discounts and volume rebates from pharmaceutical manufacturers at current levels, our gross margins may decline.

We have contractual relationships with pharmaceutical manufacturers or wholesalers that provide us with purchase discounts and volume rebates on certain prescription drugs dispensed through our mail-order and specialty pharmacies. These discounts and volume rebates are generally passed on to clients in the form of steeper price discounts. Changes in existing federal or state laws or regulations or in their interpretation by courts and agencies or the adoption of new laws or regulations relating to patent term extensions, and purchase discount and volume rebate arrangements with pharmaceutical manufacturers, may reduce the discounts or volume rebates we receive and materially adversely impact our results of operations, financial position, and cash flows.

Our ability to obtain funds from certain of our licensed subsidiaries is restricted by state insurance regulations.

Because we operate as a holding company, we are dependent upon dividends and administrative expense reimbursements from our subsidiaries to fund the obligations of Humana Inc., our parent company. Certain of our insurance subsidiaries operate in states that regulate the payment of dividends, loans, administrative expense reimbursements or other cash transfers to Humana Inc., and require minimum levels of equity as well as limit investments to approved securities. The amount of dividends that may be paid to Humana Inc. by these insurance subsidiaries, without prior approval by state regulatory authorities, or ordinary dividends, is limited based on the entity's level of statutory income and statutory capital and surplus. In most states, prior notification is provided before paying a dividend even if approval is not required. Actual dividends paid may vary due to consideration of excess statutory capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix. Dividends from our non-insurance companies such as in our Healthcare Services segment are generally not restricted by Departments of Insurance. In the event that we are unable to provide sufficient capital to fund the obligations of Humana Inc., our results of operations, financial position, and cash flows may be materially adversely affected.

Downgrades in our debt ratings, should they occur, may adversely affect our business, results of operations, and financial condition.

Claims paying ability, financial strength, and debt ratings by recognized rating organizations are an increasingly important factor in establishing the competitive position of insurance companies. Ratings information is broadly disseminated and generally used throughout the industry. We believe our claims paying ability and financial strength ratings are an important factor in marketing our products to certain of our customers. In addition, our debt ratings impact both the cost and availability of future borrowings. Each of the rating agencies reviews its ratings periodically and there can be no assurance that current ratings will be maintained in the future. Our ratings reflect each rating agency’s opinion of our financial strength, operating performance, and ability to meet our debt obligations or obligations to policyholders, but are not evaluations directed toward the protection of investors in our common stock and should not be relied upon as such.

Historically, rating agencies take action to lower ratings due to, among other things, perceived concerns about liquidity or solvency, the competitive environment in the insurance industry, the inherent uncertainty in determining reserves for future claims, the outcome of pending litigation and regulatory investigations, and possible changes in the methodology or criteria applied by the rating agencies. In addition, rating agencies have come under regulatory and public scrutiny over the ratings assigned to various fixed-income products. As a result, rating agencies may (i) become more conservative in their methodology and criteria, (ii) increase the frequency or scope of their credit reviews, (iii) request additional information from the companies that they rate, or (iv) adjust upward the capital and other requirements employed in the rating agency models for maintenance of certain ratings levels.

We believe that some of our customers place importance on our credit ratings, and we may lose customers and compete less successfully if our ratings were to be downgraded. In addition, our credit ratings affect our ability to obtain investment capital on favorable terms. If our credit ratings were to be lowered, our cost of borrowing likely would

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increase, our sales and earnings could decrease, and our results of operations, financial position, and cash flows may be materially adversely affected.

The securities and credit markets may experience volatility and disruption, which may adversely affect our business.

Volatility or disruption in the securities and credit markets could impact our investment portfolio. We evaluate our investment securities for impairment on a quarterly basis. This review is subjective and requires a high degree of judgment. For the purpose of determining gross realized gains and losses, the cost of investment securities sold is based upon specific identification. For debt securities held, we recognize an impairment loss in income when the fair value of the debt security is less than the carrying value and we have the intent to sell the debt security or it is more likely than not that we will be required to sell the debt security before recovery of our amortized cost basis, or if a credit loss has occurred. When we do not intend to sell a security in an unrealized loss position, potential other-than-temporary impairments are considered using variety of factors, including the length of time and extent to which the fair value has been less than cost; adverse conditions specifically related to the industry, geographic area or financial condition of the issuer or underlying collateral of a security; payment structure of the security; changes in credit rating of the security by the rating agencies; the volatility of the fair value changes; and changes in fair value of the security after the balance sheet date. For debt securities, we take into account expectations of relevant market and economic data. We continuously review our investment portfolios and there is a continuing risk that declines in fair value may occur and additional material realized losses from sales or other-than-temporary impairments may be recorded in future periods.

We believe our cash balances, investment securities, operating cash flows, and funds available under our credit agreement or from other public or private financing sources, taken together, provide adequate resources to fund ongoing operating and regulatory requirements, acquisitions, future expansion opportunities, and capital expenditures for at least the next twelve months, as well as to refinance or repay debt, and repurchase shares. However, continuing adverse securities and credit market conditions may significantly affect the availability of credit. While there is no assurance in the current economic environment, we have no reason to believe the lenders participating in our credit agreement will not be willing and able to provide financing in accordance with the terms of the agreement.

Our access to additional credit will depend on a variety of factors such as market conditions, the general availability of credit, both to the overall market and our industry, our credit ratings and debt capacity, as well as the possibility that customers or lenders could develop a negative perception of our long or short-term financial prospects. Similarly, our access to funds could be limited if regulatory authorities or rating agencies were to take negative actions against us. If a combination of these factors were to occur, we may not be able to successfully obtain additional financing on favorable terms or at all.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

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ITEM 2. PROPERTIES

The following table lists, by state, the number of medical centers and administrative offices we owned or leased at December 31, 2018:

	Medical Centers		Administrative Offices
	Owned	Leased	Owned	Leased	Total
Florida	13	207	—	69	289
Texas	1	17	2	14	34
Kentucky	2	3	15	12	32
Arizona	—	17	—	6	23
Louisiana	—	6	—	10	16
Virginia	—	8	—	7	15
Illinois	—	5	—	10	15
California	—	2	—	12	14
Ohio	—	1	—	13	14
South Carolina	—	6	—	6	12
New York	—	—	—	13	13
Nevada	—	7	—	5	12
Puerto Rico	—	1	—	10	11
Indiana	—	5	—	5	10
Georgia	—	8	—	3	11
Washington	—	7	—	4	11
Tennessee	—	—	—	9	9
New Jersey	—	—	—	9	9
Colorado	—	5	—	3	8
Michigan	—	5	—	3	8
North Carolina	—	2	—	4	6
Others	—	9	1	38	48
Total	16	321	18	265	620

The medical centers we operate are primarily located in Florida and Texas, including full-service, multi-specialty medical centers staffed by primary care providers and medical specialists. Of the medical centers included in the table above, approximately 44 of these facilities are leased or subleased to our contracted providers to operate.

Our principal executive office is located in the Humana Building, 500 West Main Street, Louisville, Kentucky 40202. In addition to the headquarters in Louisville, Kentucky, we maintain other principal operating facilities used for customer service, enrollment, and/or claims processing and certain other corporate functions in Louisville, Kentucky; Green Bay, Wisconsin; Tampa, Florida; Cincinnati, Ohio; San Antonio, Texas; and San Juan, Puerto Rico.

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ITEM 3. LEGAL PROCEEDINGS

We are party to a variety of legal actions in the ordinary course of business, certain of which may be styled as class-action lawsuits. Among other matters, this litigation may include employment matters, claims of medical malpractice, bad faith, nonacceptance or termination of providers, anticompetitive practices, improper rate setting, provider contract rate disputes, qui tam litigation brought by individuals seeking to sue on behalf of the government, failure to disclose network discounts and various other provider arrangements, general contractual matters, intellectual property matters, and challenges to subrogation practices. For a discussion of our material legal actions, including those not in the ordinary course of business, see “Legal Proceedings and Certain Regulatory Matters” in Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data. We cannot predict the outcome of these suits with certainty.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5. MARKET FOR THE REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Information

Our common stock trades on the New York Stock Exchange under the symbol HUM.

Holders of our Capital Stock

As of January 31, 2019, there were approximately 2,300 holders of record of our common stock and approximately 244,700 beneficial holders of our common stock.

Dividends

The following table provides details of dividend payments, excluding dividend equivalent rights, in 2017 and 2018, under our Board approved quarterly cash dividend policy:

Record Date	Payment Date	Amount per Share	Total Amount
			(in millions)
2017 payments
1/12/2017	1/27/2017	$0.29	$43
3/31/2017	4/28/2017	$0.40	$58
6/30/2017	7/31/2017	$0.40	$58
9/29/2017	10/27/2017	$0.40	$57
2018 payments
12/29/2017	1/26/2018	$0.40	$55
3/30/2018	4/27/2018	$0.50	$69
6/29/2018	7/27/2018	$0.50	$69
9/28/2018	10/26/2018	$0.50	$69

On November 2, 2018, the Board declared a cash dividend of $0.50 per share that was paid on January 25, 2019 to stockholders of record on December 31, 2018, for an aggregate amount of $68 million. Declaration and payment of future quarterly dividends is at the discretion of our Board and may be adjusted as business needs or market conditions change.

In February 2019, the Board declared a cash dividend of$0.55 per share payable on April 26, 2019 to stockholders of record on March 29, 2019.

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Stock Total Return Performance

The following graph compares our total return to stockholders with the returns of the Standard & Poor’s Composite 500 Index (“S&P 500”) and the Dow Jones US Select Health Care Providers Index (“Peer Group”) for the five years ended December 31, 2018. The graph assumes an investment of $100 in each of our common stock, the S&P 500, and the Peer Group on December 31, 2013, and that dividends were reinvested when paid.

	12/31/2013		12/31/2014		12/31/2015		12/31/2016		12/31/2017		12/31/2018
HUM	$	100	$	140	$	176	$	202	$	247	$	287
S&P 500	$	100	$	114	$	115	$	129	$	157	$	150
Peer Group	$	100	$	128	$	135	$	137	$	173	$	191

The stock price performance included in this graph is not necessarily indicative of future stock price performance.

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Issuer Purchases of Equity Securities

The following table provides information about purchases by us during the three months ended December 31, 2018 of equity securities that are registered by us pursuant to Section 12 of the Exchange Act:

Period	Total Number of Shares Purchased (1)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (1)(2)	Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (1) (2)
October 2018	—	$	—	—	$	1,776,354,011
November 2018	1,937,797	309.63		1,937,797	1,176,354,010
December 2018	—	—		—	1,176,354,010
Total	1,937,797	$	309.63	1,937,797

(1) On December 14, 2017, our Board of Directors authorized the repurchase of up to $3.0 billion of our common shares expiring on December 31, 2020, exclusive of shares repurchased in connection with employee stock plans. Under the share repurchase authorization, shares may be purchased from time to time at prevailing prices in the open market, by block purchases, through plans designed to comply with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, or in privately-negotiated transactions, including pursuant to accelerated share repurchase agreements with investment banks, subject to certain regulatory restrictions on volume, pricing, and timing. On November 28, 2018, we entered into an accelerated stock repurchase agreement, the November 2018 ASR, with Goldman, Sachs & Co. LLC, or Goldman Sachs, to repurchase $750 million of our common stock as part of the$3.0 billionshare repurchase program authorized by the Board of Directors on December 14, 2017. On November 29, 2018, we made a payment of $750 million to Goldman Sachs from available cash on hand and received an initial delivery of 1.94 million shares of our common stock from Goldman Sachs. The payment to Goldman Sachs was recorded as a reduction to stockholders’ equity, consisting of an $600 million increase in treasury stock, which reflects the value of the initial 1.94 million shares received upon initial settlement, and a $150 million decrease in capital in excess of par value, which reflected the value of stock held back by Goldman Sachs pending final settlement of the November 2018 ASR. Our remaining repurchase authorization was approximately $1,176 million as of February 21, 2019, excluding the $150 million pending final settlement of our November 2018 ASR.

(2) Excludes 0.15 million shares repurchased in connection with employee stock plans.

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ITEM 6. SELECTED FINANCIAL DATA

	2018			2017			2016 (a)			2015			2014
	(dollars in millions, except per common share results)
Summary of Operating Results:
Revenues:
Premiums	$	54,941		$	52,380		$	53,021		$	52,409		$	45,959
Services	1,457			982			969			1,406			2,164
Investment income	514			405			389			474			377
Total revenues	56,912			53,767			54,379			54,289			48,500
Operating expenses:
Benefits	45,882			43,496			45,007			44,269			38,166
Operating costs	7,525			6,567			7,173			7,295			7,639
Merger termination fee and related costs, net	—			(936		)	104			23			—
Depreciation and amortization	405			378			354			355			333
Total operating expenses	53,812			49,505			52,638			51,942			46,138
Income from operations	3,100			4,262			1,741			2,347			2,362
Loss (gain) on sale of business	786			—			—			(270		)	—
Interest expense	218			242			189			186			192
Other expense, net	33			—			—			—			—
Income before income taxes and equity in net earnings	2,063			4,020			1,552			2,431			2,170
Provision for income taxes	391			1,572			938			1,155			1,023
Equity in net earnings of Kindred at Home	11			—			—			—			—
Net income	$	1,683		$	2,448		$	614		$	1,276		$	1,147
Basic earnings per common share	$	12.24		$	16.94		$	4.11		$	8.54		$	7.44
Diluted earnings per common share	$	12.16		$	16.81		$	4.07		$	8.44		$	7.36
Dividends declared per common share	$	2.00		$	1.60		$	1.16		$	1.15		$	1.11
Financial Position:
Cash and investments	$	12,780		$	16,344		$	13,675		$	11,681		$	11,482
Total assets	25,413			27,178			25,396			24,678			23,497
Benefits payable	4,862			4,668			4,563			4,976			4,475
Debt	6,069			4,920			4,092			4,093			3,795
Stockholders’ equity	10,161			9,842			10,685			10,346			9,646
Cash flows from operations	$	2,173		$	4,051		$	1,936		$	868		$	1,618
Key Financial Indicators:
Benefit ratio	83.5		%	83.0		%	84.9		%	84.5		%	83.0		%
Operating cost ratio	13.3		%	12.3		%	13.3		%	13.6		%	15.9		%
Membership by Segment:
Retail segment:
Medical membership	9,161,500			9,206,300			8,751,300			8,327,700			7,360,300
Group and Specialty segment:
Medical membership	7,415,200			4,638,200			4,793,300			4,963,400			5,430,200
Specialty membership	6,072,300			6,986,000			6,961,200			7,221,800			7,668,500
Individual commercial segment:
Medical membership	—			128,800			654,800			899,100			1,016,200
Other Businesses:
Medical membership	—			29,800			30,800			32,600			35,000
Consolidated:
Total medical membership	16,576,700			14,003,100			14,230,200			14,222,800			13,841,700
Total specialty membership	6,072,300			6,986,000			6,961,200			7,221,800			7,668,500

(a) Includes a reduction in premiums revenue of $583 million ($367 million after tax, or $2.43 per diluted common share) associated with the write-off of commercial risk corridor receivables. Also includes benefits expense of $505 million ($318 million after tax, or $2.11 per diluted common share) for reserve strengthening associated with our non-strategic closed block of long-term care insurance policies, which were sold in 2018.

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Executive Overview

General

Humana Inc., headquartered in Louisville, Kentucky, is a leading health and well-being company committed to helping our millions of medical and specialty members achieve their best health. Our successful history in care delivery and health plan administration is helping us create a new kind of integrated care with the power to improve health and well‐being and lower costs. Our efforts are leading to a better quality of life for people with Medicare, families, individuals, military service personnel, and communities at large. To accomplish that, we support physicians and other health care professionals as they work to deliver the right care in the right place for their patients, our members. Our range of clinical capabilities, resources and tools, such as in‐home care, behavioral health, pharmacy services, data analytics and wellness solutions, combine to produce a simplified experience that makes health care easier to navigate and more effective.

Our industry relies on two key statistics to measure performance. The benefit ratio, which is computed by taking total benefits expense as a percentage of premiums revenue, represents a statistic used to measure underwriting profitability. The operating cost ratio, which is computed by taking total operating costs, excluding Merger termination fee and related costs, net, and depreciation and amortization, as a percentage of total revenue less investment income, represents a statistic used to measure administrative spending efficiency.

Business Segments

We manage our business with four reportable segments: Retail, Group and Specialty, Healthcare Services, and Individual Commercial. In addition, the Other Businesses category includes businesses that are not individually reportable because they do not meet the quantitative thresholds required by generally accepted accounting principles. These segments are based on a combination of the type of health plan customer and adjacent businesses centered on well-being solutions for our health plans and other customers, as described below. These segment groupings are consistent with information used by our Chief Executive Officer to assess performance and allocate resources. See Note 17 to the consolidated financial statements included in Item 8. - Financial Statements and Supplementary Data for segment financial information.

The Retail segment consists of Medicare benefits, marketed to individuals or directly via group Medicare accounts. In addition, the Retail segment also includes our contract with CMS to administer the Limited Income Newly Eligible Transition, or LI-NET, prescription drug plan program and contracts with various states to provide Medicaid, dual eligible, and Long-Term Support Services benefits, which we refer to collectively as our state-based contracts. The Group and Specialty segment consists of employer group commercial fully-insured medical and specialty health insurance benefits marketed to individuals and employer groups, including dental, vision, and other supplemental health benefits, as well as administrative services only, or ASO products. In addition, our Group and Specialty segment includes military services business, primarily our TRICARE T2017 East Region contract. The Healthcare Services segment includes our services offered to our health plan members as well as to third parties, including pharmacy solutions, provider services, and clinical care service, such as home health and other services and capabilities to promote wellness and advance population health, including our investment in Kindred at Home. The Individual Commercial segment consisted of our individual commercial fully-insured medical health insurance business, which we exited beginning January 1, 2018. We report under the category of Other Businesses those businesses that do not align with the reportable segments described above, primarily our closed-block long-term care insurance policies, which were sold in 2018.

The results of each segment are measured by income before income taxes and equity in net earnings from Kindred at Home, or segment earnings. Transactions between reportable segments primarily consist of sales of services rendered by our Healthcare Services segment, primarily pharmacy, provider, and clinical care services, to our Retail and Group and Specialty segment customers. Intersegment sales and expenses are recorded at fair value and eliminated in consolidation. Members served by our segments often use the same provider networks, enabling us in some instances to obtain more favorable contract terms with providers. Our segments also share indirect costs and assets. As a result, the profitability of each segment is interdependent. We allocate most operating expenses to our segments. Assets and

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certain corporate income and expenses are not allocated to the segments, including the portion of investment income not supporting segment operations, interest expense on corporate debt, and certain other corporate expenses. These items are managed at a corporate level. These corporate amounts are reported separately from our reportable segments and are included with intersegment eliminations.

Seasonality

One of the product offerings of our Retail segment is Medicare stand-alone prescription drug plans, or PDPs, under the Medicare Part D program. Our quarterly Retail segment earnings and operating cash flows are impacted by the Medicare Part D benefit design and changes in the composition of our membership. The Medicare Part D benefit design results in coverage that varies as a member’s cumulative out-of-pocket costs pass through successive stages of a member’s plan period, which begins annually on January 1 for renewals. These plan designs generally result in us sharing a greater portion of the responsibility for total prescription drug costs in the early stages and less in the latter stages. As a result, the PDP benefit ratio generally decreases as the year progresses. In addition, the number of low income senior members as well as year-over-year changes in the mix of membership in our stand-alone PDP products affects the quarterly benefit ratio pattern.

In addition, the Retail segment also experiences seasonality in the operating cost ratio as a result of costs incurred in the second half of the year associated with the Medicare marketing season.

Our Group and Specialty segment also experiences seasonality in the benefit ratio pattern. However, the effect is opposite of Medicare stand-alone PDP in the Retail segment, with the Group and Specialty segment’s benefit ratio increasing as fully-insured members progress through their annual deductible and maximum out-of-pocket expenses.

Aetna Merger

On February 16, 2017, under the terms of the Agreement and Plan of Merger, or Merger Agreement, with Aetna Inc., and certain wholly owned subsidiaries of Aetna Inc., which we collectively refer to as Aetna, we received a breakup fee of $1 billion from Aetna, which is included in our consolidated statement of income in the line captioned "Merger termination fee and related costs, net."

Acquisitions and Divestitures

On August 9, 2018, we completed the sale of our wholly-owned subsidiary, KMG America Corporation, or KMG, to Continental General Insurance Company, or CGIC, a Texas-based insurance company wholly owned by HC2 Holdings, Inc., a diversified holding company. KMG's subsidiary, Kanawha Insurance Company, or KIC, includes our closed block of non-strategic commercial long-term care policies. Upon closing, we funded the transaction with approximately $190 million of parent company cash contributed into KMG, subject to customary adjustments, in addition to the transfer of approximately $160 million of statutory capital with the sale. In connection with the sale of KMG, we recognized a pretax loss, including transaction costs, of $786 million and a corresponding $452 million tax benefit. Prior to the sale of KMG, we entered into reinsurance contracts to transfer the risk associated with certain voluntary benefit and financial protection products previously issued primarily by KIC to a third party. We transferred approximately $245 millionof cash to the third party and recorded a commensurate reinsurance recoverable as a result of these transactions. The reinsurance recoverable was included as part of the net assets disposed. There was no material impact to operating results from these reinsurance transactions.

On July 2, 2018 and July 11, 2018, we along with TPG Capital, or TPG, and Welsh, Carson, Anderson & Stowe, or WCAS, collectively, the Sponsors, completed the acquisitions of Kindred and Curo, respectively, merging Curo with the hospice business of Kindred at Home. As part of these transactions, we acquired a 40% minority interest in the combined business, Kindred at Home, a for total cash consideration of approximately $1.1 billion.

On April 10, 2018, we acquired Family Physicians Group, or FPG, for cash consideration of approximately $185 million, net of cash received. FPG is one of the largest at-risk providers serving Medicare Advantage and Managed

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Medicaid HMO patients in Greater Orlando, Florida with a footprint that includes clinics located in Lake, Orange, Osceola and Seminole counties.

On March 1, 2018, we acquired the remaining equity interest in MCCI Holdings LLC, or MCCI, a privately held management service organization headquartered in Miami, Florida, that primarily coordinates medical care for Medicare Advantage beneficiaries in Florida and Texas. The purchase price consisted primarily of $169 million cash, as well as our existing investment in MCCI and a note receivable and a revolving note with an aggregate balance of $383 million.

These transactions are more fully discussed in Note 3 to the consolidated financial statements.

Highlights

Consolidated

• Our 2018 results reflect the continued implementation of our strategy to offer our members affordable health care combined with a positive consumer experience in growing markets. At the core of this strategy is our integrated care delivery model, which unites quality care, high member engagement, and sophisticated data analytics. Our approach to primary, physician-directed care for our members aims to provide quality care that is consistent, integrated, cost-effective, and member-focused, provided by both employed physicians and physicians with network contract arrangements. The model is designed to improve health outcomes and affordability for individuals and for the health system as a whole, while offering our members a simple, seamless healthcare experience. We believe this strategy is positioning us for long-term growth in both membership and earnings. We offer providers a continuum of opportunities to increase the integration of care and offer assistance to providers in transitioning from a fee-for-service to a value-based arrangement. These include performance bonuses, shared savings and shared risk relationships. At December 31, 2018, approximately 2,039,100 members, or 67%, of our individual Medicare Advantage members were in value-based relationships under our integrated care delivery model, as compared to 1,901,300 members, or 66%, at December 31, 2017.

• Our consolidated pretax income was $2.06 billion for 2018 compared to $4.02 billion in 2017. A number of significant items effected our year-over-year comparisons including the following:

◦ The net gain associated with the terminated Merger Agreement, mainly the break-up fee of $936 million in 2017.

◦ The loss on sale of KMG of $786 million in 2018.

◦ Charges in 2017 of $219 million associated with voluntary and involuntary workforce reduction programs, the Penn Treaty guaranty fund assessment and costs associated with the early retirement of debt.

◦ Lower year-over-year segment earnings in our Retail, Group and Specialty and Healthcare Services segments reflects the impact of investing the benefit of a lower tax rate from the 2017 Tax Reform Law into the establishment of an annual incentive compensation program for a broader range of employees, together with additional investments in the communities of our members, technology and our integrated care delivery model to drive more affordable healthcare and better clinical outcomes.

◦ Our year-over-year pretax comparisons were also favorably impacted by strong Medicare Advantage membership growth and operating efficiencies from productivity initiatives implemented in 2017. These increases were partially offset by enhanced 2018 Medicare Advantage benefits resulting from investing the better than expected 2017 individual Medicare Advantage pretax earnings, coupled with the return of the health insurance industry fee, and a more severe flu season in 2018.

• Year-over-year comparisons of diluted earnings per common share were also favorably impacted by a lower number of shares used to compute earnings per common share from share repurchases and the impact of a lower tax rate for the year ended December 31, 2018.The 2017 Tax Reform Law coupled with the tax benefit

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from the sale of KMG, partially offset by return of the nondeductible health insurance industry fee, drove the lower tax rate in 2018.

• We returned capital to our shareholders in the form of increased shareholder dividends and significant share repurchase.  In 2018, we increased our per share dividend by 25% and repurchased shares worth approximately $1.1 billion, including the accelerated share repurchase agreement, or ASR, that we entered into in November 2018.

• The annual health insurance industry fee was suspended for calendar year 2017, but resumed in 2018. Operating costs associated with the health insurance industry fee attributable to 2018 were $1.04 billion paid in October 2018. This fee is not deductible for tax purposes, which increases our effective income tax rate. The one-year suspension in 2017 of the health insurance industry fee significantly reduced our operating costs and effective tax rate during 2017. The annual health insurance industry fee is also suspended for calendar year 2019, but under current law is scheduled to resume for calendar year 2020.

Retail Segment

• Individual and Group Medicare Advantage membership increased  259,600 members, or 7.9%, in 2018 to 3,561,800 members December 31, 2018. 

• On January 30, 2019, after the stock market closed, the Centers for Medicare and Medicaid Services (CMS) issued its preliminary 2020 Medicare Advantage and Part D payment rates and proposed policy changes (collectively, the Advance Notice). CMS has invited public comment on the Advance Notice before publishing final rates on April 1, 2019 (the Final Notice). In the Advance Notice, CMS estimates Medicare Advantage plans across the sector will, on average, experience a 1.59 percent increase in benchmark funding based on proposals included therein. As indicated by CMS, its estimate excludes the impact of fee‐for‐service county rebasing/re‐pricing since the related impact is dependent upon finalization of certain data, which will be available with the publication of the Final Notice. Based on our preliminary analysis using the same factors CMS included in its estimate, the components of which are detailed on CMS’ website, we anticipate the proposals in the Advance Notice would result in a change to our benchmark funding relatively in line with CMS’ estimate. We will be drawing upon our program expertise to provide CMS formal commentary on the impact of the Advance Notice and the related impact upon Medicare beneficiaries’ quality of care and service to our members through the Medicare Advantage program.

• On April 24, 2018, we received a Notice of Intent to be Awarded a Comprehensive Medicaid Contract under Florida’s Statewide Managed Medicaid Program in all 11 regions, including the South Florida, Tampa, Jacksonville, and Orlando metro areas. The comprehensive program combines the traditional Medicaid, or TANF, and Long-Term Care programs. Phase-in under the new contract began December 2018 and was fully implemented February 1, 2019.

• In October 2018, CMS published its updated Star quality ratings for bonus year 2020. We received a 5-star rating on CMS' 5-star rating system for two MA contracts offered in Florida and Tennessee. In addition, we received a 4.5-star rating for two MA contracts offered in Florida, Illinois, Kentucky, Mississippi, North Carolina, and Oregon. We have 12 contracts rated 4-star or above and 3 million members in 4-star or above rated contracts to be offered in 2019, representing 84% of our MA membership as of July 2018. The achievement of a 5-star rating for two MA contracts in Florida and Tennessee provides us the ability to market for these contracts throughout the year, creating an opportunity for increased penetration in these important geographies. We cannot guarantee, however, our ability to maintain or improve our star ratings.

Group and Specialty Segment

• During 2018, we transitioned to the new, larger T2017 East Region contract increasing membership 2,846,800 or 92.4%.The T2017 East Region contract is a consolidation of the former T3 North and South Regions, comprising thirty-two states and approximately 6 million TRICARE beneficiaries, under which delivery of health care services commenced on January 1, 2018. The T2017 East Region contract is a 5-year contract set

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to expire on December 31, 2022 and is subject to renewals on January 1 of each year during its term at the government's option.

Healthcare Services Segment

• We continued to invest in our Healthcare Services segment necessary to drive effective care delivery and clinical outcomes with our acquisitions of MCCI and FPG and our 40% investment in Kindred at Home.

• Medicare Advantage and dual demonstration program membership enrolled in a Humana chronic care management program was 716,000 at December 31, 2018, a decrease of 9.9% from 794,900 at December 31, 2017. These members may not be unique to each program since members have the ability to enroll in multiple programs. We have undergone an optimization process that ensures the appropriate level of member interaction with clinicians to drive quality outcomes, which has resulted in improved Retail segment operating results.

Health Care Reform

The Health Care Reform Law enacted significant reforms to various aspects of the U.S. health insurance industry. Certain significant provisions of the Health Care Reform Law include, among others, mandated coverage requirements, mandated benefits and guarantee issuance associated with commercial medical insurance, rebates to policyholders based on minimum benefit ratios, adjustments to Medicare Advantage premiums, the establishment of federally facilitated or state-based exchanges coupled with programs designed to spread risk among insurers, and the introduction of plan designs based on set actuarial values. In addition, the Health Care Reform Law established insurance industry assessments, including an annual health insurance industry fee. The annual health insurance industry fee levied on the insurance industry is $14.3 billion in 2018 and is not deductible for income tax purposes, which significantly increases our effective income tax rate. A one year suspension of the health insurance industry fee, as we experienced in 2017 and are experiencing in 2019, significantly impacts our trend in key operating metrics including our operating cost and medical expense ratios, as well as our effective tax rate. The annual health insurance industry fee is scheduled to resume for calendar year 2020 under current law.

As noted above, the Health Care Reform Law required the establishment of health insurance exchanges for individuals and small employers to purchase health insurance that became effective January 1, 2014, with an annual

open enrollment period. Although we previously participated in these exchanges by offering on-exchange individual

commercial medical plans, effective January 1, 2018, we have exited our Individual Commercial medical business.

On November 2, 2017, we filed suit against the United States of America in the United States Court of Federal Claims, on behalf of our health plans seeking recovery from the federal government of approximately $611 million in payments under the risk corridor premium stabilization program established under the Health Care Reform Law, for years 2014, 2015 and 2016. Our case has been stayed by the Court, pending resolution of similar cases filed by other insurers.

It is reasonably possible that the Health Care Reform Law and related regulations, as well as future legislative, judicial or regulatory changes, including restrictions on our ability to manage our provider network or otherwise operate our business, or restrictions on profitability, including reviews by regulatory bodies that may compare our Medicare Advantage profitability to our non-Medicare Advantage business profitability, or compare the profitability of various products within our Medicare Advantage business, and require that they remain within certain ranges of each other, in the aggregate may have a material adverse effect on our results of operations (including restricting revenue, enrollment and premium growth in certain products and market segments, restricting our ability to expand into new markets, increasing our medical and operating costs, further lowering our Medicare payment rates and increasing our expenses associated with the non-deductible health insurance industry fee and other assessments); our financial position (including our ability to maintain the value of our goodwill); and our cash flows.

We intend for the discussion of our financial condition and results of operations that follows to assist in the understanding of our financial statements and related changes in certain key items in those financial statements from year to year, including the primary factors that accounted for those changes. Transactions between reportable segments primarily consist of sales of services rendered by our Healthcare Services segment, primarily pharmacy, provider, and

42

clinical care services, to our Retail and Group and Specialty segment customers and are described in Note 17to the consolidated financial statements included in Item 8. Financial Statements and Supplementary Data in this 2018 Form 10-K.

43

Comparison of Results of Operations for 2018 and 2017

Certain financial data on a consolidated basis and for our segments was as follows for the years ended December 31, 2018 and 2017:

Consolidated

							Change
	2018			2017			Dollars			Percentage
	(dollars in millions, except per common share results)
Revenues:
Premiums:
Retail	$	48,108		$	44,626		$	3,482		7.8	%
Group and Specialty	6,803			6,772			31			0.5	%
Individual Commercial	8			947			(939		)	(99.2	)%
Other Businesses	22			35			(13		)	(37.1	)%
Total premiums	54,941			52,380			2,561			4.9	%
Services:
Retail	11			10			1			10.0	%
Group and Specialty	835			626			209			33.4	%
Healthcare Services	607			338			269			79.6	%
Other Businesses	4			8			(4		)	(50.0	)%
Total services	1,457			982			475			48.4	%
Investment income	514			405			109			26.9	%
Total revenues	56,912			53,767			3,145			5.8	%
Operating expenses:
Benefits	45,882			43,496			2,386			5.5	%
Operating costs	7,525			6,567			958			14.6	%
Merger termination fee and related costs, net	—			(936		)	936			(100.0	)%
Depreciation and amortization	405			378			27			7.1	%
Total operating expenses	53,812			49,505			4,307			8.7	%
Income from operations	3,100			4,262			(1,162		)	(27.3	)%
Loss on sale of business	786			—			786			100.0	%
Interest expense	218			242			(24		)	(9.9	)%
Other expense, net	33			—			33			100.0	%
Income before income taxes and equity in net earnings	2,063			4,020			(1,957		)	(48.7	)%
Provision for income taxes	391			1,572			(1,181		)	(75.1	)%
Equity in net earnings of Kindred at Home	11			—			11			100.0	%
Net income	$	1,683		$	2,448		$	(765	)	(31.3	)%
Diluted earnings per common share	$	12.16		$	16.81		$	(4.65	)	(27.7	)%
Benefit ratio (a)	83.5		%	83.0		%				0.5	%
Operating cost ratio (b)	13.3		%	12.3		%				1.0	%
Effective tax rate	18.9		%	39.1		%				(20.2	)%

(a) Represents total benefits expense as a percentage of premiums revenue.

(b) Represents total operating costs, excluding depreciation and amortization, as a percentage of total revenues less investment income.

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Summary

Net income for 2018 was $1.7 billion, or $12.16 per diluted common share compared to $2.4 billion, or $16.81 per diluted common share, in 2017. This comparison was impacted by the loss on sale of KMG in 2018, the Merger Agreement break-up fee in 2017, the suspension of the health insurance industry fee for calendar year 2017, the exit out of the Individual Commercial business effective January 1, 2018, a lower tax rate due to the Tax Reform Law, charges associated with both voluntary and involuntary workforce reduction programs in 2017, and the estimated guaranty fund assessment expense to support the policyholders obligation of Penn Treaty in 2017. After consideration of these items, our earnings were favorably impacted by strong Medicare Advantage membership growth and significant operating efficiencies in 2018 driven by productivity initiatives implemented in 2017. These increases were partially offset by our offering of enhanced 2018 Medicare Advantage member benefits which resulted from the investment of the better than expected 2017 individual Medicare Advantage pretax earnings, coupled with the return of the health insurance industry fee and the more severe flu season during the first quarter of 2018.The comparison of diluted earnings per common share are also impacted by a lower number of shares from share repurchases.

Premiums Revenue

Consolidated premiums increased$2.6 billion, or 4.9%, from $52.4 billion for 2017 to $54.9 billion for 2018 primarily driven by higher Medicare Advantage revenues, partially offset by the impact of lower revenues from the exit of the Individual Commercial business.

Services Revenue

Consolidated services revenue increased$475 million, or 48.4%, from $982 million for 2017 to $1.5 billion for 2018, primarily due to an increase in services revenue in the Healthcare Services and Group and Specialty segments, as discussed in the detailed segment results discussion that follows.

Investment Income

Investment income was $514 million for 2018, increasing$109 million, or 26.9%, from 2017, primarily due to higher realized capital gains and higher interest rates in 2018, partially offset by lower average invested balances.

Benefits Expense

Consolidated benefits expense was $45.9 billion for 2018, an increase of $2.4 billion, or 5.5%, from 2017 reflecting an increase in the Retail and Group and Specialty segments benefits expense as discussed in the detailed segment results discussion that follows. These increases were partially offset by a decrease in the Individual Commercial segment benefits expense. As more fully described herein under the section entitled “Benefits Expense Recognition”, actuarial standards require the use of assumptions based on moderately adverse experience, which generally results in favorable reserve development, or reserves that are considered redundant. We experienced favorable medical claims reserve development related to prior fiscal years of $503 million in 2018 and $483 million in 2017.

The consolidated benefit ratio for 2018 was 83.5%, an increase of 50 basis points from 2017 primarily due to the enhanced 2018 Medicare Advantage member benefits resulting from the investment of the better than expected 2017 individual Medicare Advantage pretax earnings and a more severe flu season in the first quarter of 2018. These items were partially offset by the positive impact from the reinstatement of the health insurance industry fee in 2018, which was contemplated in the pricing and benefit design of our products and higher favorable prior-period reserve development. Favorable prior-period medical claims reserve development decreased the consolidated benefit ratio by approximately 90 basis points in both 2018 and 2017.

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Operating Costs

Our segments incur both direct and shared indirect operating costs. We allocate the indirect costs shared by the segments primarily as a function of revenues. As a result, the profitability of each segment is interdependent.

Consolidated operating costs increased$958 million, or 14.6%, from 2017 to $7.5 billion in 2018 reflecting an increase in the Retail and Group and Specialty segments discussed in the detailed segment results discussion that follows. These increases were partially offset by a decrease in the Individual Commercial segment operating costs.

The consolidated operating cost ratio for 2018 was 13.3%, increasing100 basis points from 12.3% in 2017 primarily due to the reinstatement of the health insurance industry fee in 2018, and long term sustainability investments made in 2018 as a result of the Tax Reform Law. Our long-term sustainability investments include the continuation of investments in our associate workforce, primarily the establishment of an annual incentive program for a broader range of employees, together with additional investments in the communities of our members, technology and our integrated care delivery model to drive more affordable healthcare and better clinical outcomes, and an increase in incentive compensation costs under the expanded program noted above. The ratio was further impacted by the growth in our military services business, which carries a higher operating ratio than our other products, due to the previously disclosed transition to the T2017 East Region contract effective January 1, 2018. These items were partially offset by the favorable impact of significant operating cost efficiencies in 2018 driven by productivity initiatives implemented in 2017, the impact of the charges recorded in 2017 associated with the voluntary and involuntary workforce reduction program, and the favorable year-over-year comparison of the impact of the guaranty fund assessment expense to support policyholder obligations of Penn Treaty in 2017, as well as the exit of the Individual Commercial business effective January 1, 2018, which carried a higher operating cost ratio than our other products. The nondeductible health insurance industry fee impacted the operating cost ratio by approximately 180 basis points in 2018.

Depreciation and Amortization

Depreciation and amortization in 2018 totaled $405 million compared to $378 million in 2017, an increase of 7.1%, primarily due to capital expenditures, the acquisitions of MCCI and FPG, and the write-off of a trade name value reflecting the re-branding of certain provider assets.

Interest Expense

Interest expense was $218 million for 2018 compared to $242 million for 2017, a decrease of $24 million, or 9.9%, primarily as a result of the early redemption of higher rate debt in December 2017.

Income Taxes

Our effective tax rate during 2018 was 18.9% compared to the effective tax rate of 39.1% in 2017. This decrease is primarily due to the Tax Reform Law and the tax benefit resulting from the sale of KMG, partially offset by the impact of the reinstatement of the non-deductible health insurance industry fee in 2018. See Note 11 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data for a complete reconciliation of the federal statutory rate to the effective tax rate.

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Retail Segment

			Change
	2018	2017	Members		Percentage
Membership:
Medical membership:
Individual Medicare Advantage	3,064,000	2,860,800	203,200		7.1	%
Group Medicare Advantage	497,800	441,400	56,400		12.8	%
Medicare stand-alone PDP	5,004,300	5,308,100	(303,800	)	(5.7	)%
Total Retail Medicare	8,566,100	8,610,300	(44,200	)	(0.5	)%
State-based Medicaid	341,100	360,100	(19,000	)	(5.3	)%
Medicare Supplement	254,300	235,900	18,400		7.8	%
Total Retail medical members	9,161,500	9,206,300	(44,800	)	(0.5	)%

							Change
	2018			2017			Dollars			Percentage
	(in millions)
Premiums and Services Revenue:
Premiums:
Individual Medicare Advantage	$	35,656		$	32,720		$	2,936		9.0	%
Group Medicare Advantage	6,103			5,155			948			18.4	%
Medicare stand-alone PDP	3,584			3,702			(118		)	(3.2	)%
Total Retail Medicare	45,343			41,577			3,766			9.1	%
State-based Medicaid	2,255			2,571			(316		)	(12.3	)%
Medicare Supplement	510			478			32			6.7	%
Total premiums	48,108			44,626			3,482			7.8	%
Services	11			10			1			10.0	%
Total premiums and services revenue	$	48,119		$	44,636		$	3,483		7.8	%
Segment earnings	$	1,733		$	1,978		$	(245	)	(12.4	)%
Benefit ratio	85.1		%	85.6		%				(0.5	)%
Operating cost ratio	11.1		%	9.6		%				1.5	%

Segment Earnings

• Retail segment earnings were $1.7 billion in 2018, a decrease of $245 million, or 12.4%, compared to 2017reflecting a higher operating cost ratio in 2018, partially offset by a lower benefit ratio.

Enrollment

• Individual Medicare Advantage membership increased203,200 members, or 7.1%, from December 31, 2017 to December 31, 2018 reflecting net membership additions associated with last year's Annual Election Period, or AEP, for Medicare beneficiaries. For full year 2019, we anticipate net membership growth in our individual Medicare Advantage offerings of 375,000 to 400,000.

• Group Medicare Advantage membership increased56,400 members, or 12.8%, from December 31, 2017 to December 31, 2018 reflecting increased sales to our existing group accounts during last year's AEP for Medicare beneficiaries. For full year 2019, we anticipate net membership growth in our group Medicare Advantage offerings of approximately 30,000.

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• Medicare stand-alone PDP membership decreased303,800 members, or 5.7%, from December 31, 2017 to December 31, 2018 reflecting net declines during last year's AEP for Medicare beneficiaries. These declines primarily resulted from the previously disclosed loss of auto assigned members in Florida and South Carolina due to pricing over the CMS low income benchmark and continued membership declines in our Enhanced Plan. In addition, growth in our co-branded Walmart plan was significantly lower than historical levels due to the introduction of additional low-priced competitor offerings in many regions. For the full year 2019, we anticipate a net membership decline in our Medicare stand-alone PDP offerings of 700,000 to 750,000.

• State-based Medicaid membership decreased19,000 members, or 5.3%, from December 31, 2017 to December 31, 2018, primarily driven by our election not to participate in Illinois' Medicaid Integrated Care Program and the Virginia Long Term Support Services contract that replaced the state's previous stand-alone dual eligible demonstration program in December 2017. Year-over-year decline was also impacted by lower membership associated with our Florida Medicaid contract due to overall strengthening economic conditions, partially offset by the addition of members associated with the new Florida Managed Medical Assistance program from the contract phase-in for certain regions that began December 1, 2018.

Premiums revenue

• Retail segment premiums increased$3.5 billion, or 7.8%, from 2017 to 2018 primarily reflecting individual and group Medicare Advantage membership growth in last year's AEP as well as increased per-member premiums for certain of the segment's products, partially offset by declines in stand-alone PDP and state-based contracts revenues resulting from year-over-year membership declines discussed above. Average group and individual Medicare Advantage membership increased7.6% in 2018. Average membership is calculated by summing the ending membership for each month in a period and dividing the result by the number of months in a period. Premiums revenue reflects changes in membership and average per-member premiums. Items impacting average per-member premiums include changes in premium rates as well as changes in the geographic mix of membership, the mix of product offerings, and the mix of benefit plans selected by our membership.

Benefits expense

• The Retail segment benefit ratio of 85.1% for 2018decreased50 basis points from 2017 primarily due to the reinstatement of the non-deductible health insurance industry fee in 2018 which was contemplated in the pricing and benefit design of our products, partially offset by the unfavorable impact from enhanced 2018 Medicare Advantage member benefits resulting from the investment of the better than expected 2017 individual Medicare Advantage pretax earnings. 2018 was also impacted by a more severe flu season.

• The Retail segment’s benefits expense for 2018 included the beneficial effect of $398 million in favorable prior-year medical claims reserve development versus $386 million in 2017. This favorable prior-year medical claims reserve development decreased the Retail segment benefit ratio by approximately 80 basis points in 2018 versus approximately 90 basis points in 2017.

Operating costs

• The Retail segment operating cost ratio of 11.1% for 2018increased150 basis points from 2017 primarily due to the reinstatement of the health insurance industry fee in 2018 and increase in incentive compensation costs under the expanded program, resulting from the strategic investments made in 2018 as a result of the Tax Reform Law. These items were partially offset by significant operating cost efficiencies in 2018 driven by productivity initiatives implemented in 2017.

• The non-deductible health insurance industry fee increased the operating cost ratio by approximately 190 basis points in 2018.

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Group and Specialty Segment

			Change
	2018	2017	Members		Percentage
Membership:
Medical membership:
Fully-insured commercial group	1,004,700	1,097,700	(93,000	)	(8.5	)%
ASO	481,900	458,700	23,200		5.1	%
Military services	5,928,600	3,081,800	2,846,800		92.4	%
Total group medical members	7,415,200	4,638,200	2,777,000		59.9	%
Specialty membership (a)	6,072,300	6,986,000	(913,700	)	(13.1	)%

(a) Specialty products include dental, vision, voluntary benefit products and other supplemental health benefits and financial protection products. Members included in these products may not be unique to each product since members have the ability to enroll in multiple products.

							Change
	2018			2017			Dollars			Percentage
	(in millions)
Premiums and Services Revenue:
Premiums:
Fully-insured commercial group	$	5,444		$	5,462		$	(18	)	(0.3	)%
Specialty	1,359			1,310			49			3.7	%
Total premiums	6,803			6,772			31			0.5	%
Services	835			626			209			33.4	%
Total premiums and services revenue	$	7,638		$	7,398		$	240		3.2	%
Segment earnings	$	361		$	412		$	(51	)	(12.4	)%
Benefit ratio	79.7		%	79.2		%				0.5	%
Operating cost ratio	23.6		%	21.4		%				2.2	%

Segment Earnings

• Group and Specialty segment earnings were $361 million in 2018, a decrease of $51 million, or 12.4%, from $412 million in 2017primarily reflecting higher benefit and operating cost ratios in 2018, partially offset by a favorable year-over-year earnings comparison for our group ASO commercial medical business.

Enrollment

• Fully-insured commercial group medical membership decreased93,000 members, or 8.5% from December 31, 2017 primarily reflecting lower membership in small group accounts due in part to more small group accounts selecting level-funded ASO products in 2018. The portion of group fully-insured commercial medical membership in small group accounts was approximately 61% at December 31, 2018 and 64% at December 31, 2017.

• Group ASO commercial medical membership increased23,200 members, or 5.1%, from December 31, 2017 to December 31, 2018 reflecting more small group accounts selecting level-funded ASO products in 2018, partially offset by the loss of certain large group accounts as a result of continued discipline in pricing of services for self-funded accounts amid a highly competitive environment.

• Specialty membership decreased913,700 members, or 13.1%, from December 31, 2017 to December 31, 2018 primarily resulted from the exit of our voluntary benefits and financial protection lines of business in connection

49

with the sale of KMG, as well as the loss of some large group accounts offering stand-alone dental and vision products. These decreases were partially offset by an increase in individual dental and vision membership.

Premiums revenue

• Group and Specialty segment premiums increased$31 million, or 0.5%, from 2017 to 2018 primarily due to higher stop-loss premiums related to our level funded ASO accounts resulting from membership growth in this product, and higher per-member premiums across the commercial fully-insured business, partially offset by the exit of our voluntary benefits and financial protection lines of business in connection with the sale of KMG, as well as declines in average group fully-insured commercial medical membership.

Services revenue

• Group and Specialty segment services revenue increased$209 million, or 33.4%, from 2017 to 2018 as a result of the transition to the TRICARE T2017 East Region contract on January 1, 2018.

Benefits expense

• The Group and Specialty segment benefit ratio increased50 basis points from 79.2% in 2017 to 79.7% in 2018 primarily due to retroactive contractual rate adjustments, membership mix, including the continued migration of healthier groups to level funded ASO products in 2018, and the impact of the exit of our voluntary benefits and financial protection lines of business in connection with the sale of KMG, which carried a very low benefit ratio. These factors were partially offset by the reinstatement of the health insurance industry fee in 2018 which was contemplated in the pricing of our products, and higher favorable prior-period reserve development.

• The Group and Specialty segment’s benefits expense included the beneficial effect of $46 million in favorable prior-year medical claims reserve development in 2018 versus $40 million in 2017. This favorable prior-year medical claims reserve development decreased the Group and Specialty segment benefit ratio by approximately 70 basis points in 2018 versus approximately 60 basis points in 2017.

Operating costs

• The Group and Specialty segment operating cost ratio of 23.6% for 2018increased220 basis points from 21.4% for 2017. These increases primarily were due to the reinstatement of the health insurance industry fee in 2018, growth in our military services business, which carries a higher operating cost ratio than other products within the segment, as a result of the transition to the TRICARE T2017 East Region contract, an increase in incentive compensation costs under the expanded program resulting from the strategic investments made in 2018 as a result of the Tax Reform Law. These items were partially offset by significant operating cost efficiencies driven by productivity initiatives implemented in 2017, and the impact of the exit of our voluntary benefits and financial protection lines of business in connection with the sale of KMG. The non-deductible health insurance industry fee increased the operating cost ratio by approximately 160 basis points in 2018.

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Healthcare Services Segment

							Change
	2018			2017			Dollars			Percentage
	(in millions)
Revenues:
Services:
Clinical care services	$	176		$	181		$	(5	)	(2.8	)%
Pharmacy solutions	203			80			123			153.8	%
Provider services	228			77			151			196.1	%
Total services revenues	607			338			269			79.6	%
Intersegment revenues:
Pharmacy solutions	20,514			20,881			(367		)	(1.8	)%
Provider services	1,994			1,593			401			25.2	%
Clinical care services	662			1,111			(449		)	(40.4	)%
Total intersegment revenues	23,170			23,585			(415		)	(1.8	)%
Total services and intersegment revenues	$	23,777		$	23,923		$	(146	)	(0.6	)%
Segment earnings	$	754		$	967		$	(213	)	(22.0	)%
Operating cost ratio	96.3		%	95.5		%				0.8	%

Segment Earnings

• Healthcare Services segment earnings were $754 million in 2018, a decrease of $213 million, or 22.0%, from 2017 primarily due to the impact of the optimization process associated with our chronic care management programs and investments made in 2018 as a result of the Tax Reform Law, partially offset by the impact of Kindred at Home.

Script Volume

• Humana Pharmacy Solutions^® script volumes for the Retail and Group and Specialty segment membership increased to approximately 440 million in 2018, up2% versus scripts of approximately 433 million in 2017. The increase primarily reflects growth associated with higher Individual Advantage Medicare membership, partially offset by the decline in stand-alone PDP and Individual Commercial membership.

Services revenue

• Services revenue increased$269 million, or 79.6%, from 2017 to $607 million for 2018 primarily due to service revenue growth from our provider services and pharmacy solutions business.

Intersegment revenues

• Intersegment revenues decreased$415 million, or 1.8%, from 2017 to $23.2 billion for 2018 primarily due to a decline in pharmacy solutions revenue due to lower stand-alone PDP membership, the loss of intersegment revenues associated with our exit from the Individual commercial business, the result of improving the effectiveness of our chronic care management programs, and the impact to our provider services business of the lower Medicare rates year-over-year in geographies where our provider assets are primarily located. These declines were partially offset by Medicare Advantage membership growth as well as higher intersegment revenues associated with our provider services business reflecting our acquisition of MCCI.

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Operating costs

• The Healthcare Services segment operating cost ratio of 96.3% for 2018 increased from 95.5% for 2017 primarily due to an increase in incentive compensation costs under the expanded program resulting from the strategic investments made in 2018 as a result of the Tax Reform Law and the lag in operating cost reduction associated with improving the effectiveness of our chronic care management programs as compared to the timing of reduction in revenue. These items were partially offset by significant operating cost efficiencies in 2018 driven by productivity initiatives implemented in 2017.

Individual Commercial Segment

• In 2018, our Individual Commercial segment pretax income was $74 million, a decrease of $119 million, from a pretax income of $193 million in 2017 primarily due to the impact of favorable prior-period reserve development from the run-out of this business. We exited this business effective January 1, 2018.

Other Businesses

As previously disclosed, in the third quarter of 2018, we completed the sale of our wholly-owned subsidiary KMG, as discussed further in Note 3 to the consolidated financial statements included in Item 8. Financial Statements and Supplementary Data in this 2018 Form 10-K.

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Comparison of Results of Operations for 2017 and 2016

Certain financial data on a consolidated basis and for our segments was as follows for the years ended December 31, 2017 and 2016:

Consolidated

							Change
	2017			2016			Dollars			Percentage
	(dollars in millions, except per common share results)
Revenues:
Premiums:
Retail	$	44,626		$	43,223		$	1,403		3.2	%
Group and Specialty	6,772			6,696			76			1.1	%
Individual Commercial	947			3,064			(2,117		)	(69.1	)%
Other Businesses	35			38			(3		)	(7.9	)%
Total premiums	52,380			53,021			(641		)	(1.2	)%
Services:
Retail	10			6			4			66.7	%
Group and Specialty	626			643			(17		)	(2.6	)%
Healthcare Services	338			310			28			9.0	%
Other Businesses	8			10			(2		)	(20.0	)%
Total services	982			969			13			1.3	%
Investment income	405			389			16			4.1	%
Total revenues	53,767			54,379			(612		)	(1.1	)%
Operating expenses:
Benefits	43,496			45,007			(1,511		)	(3.4	)%
Operating costs	6,567			7,173			(606		)	(8.4	)%
Merger termination fee and related costs, net	(936		)	104			(1,040		)	(1,000.0	)%
Depreciation and amortization	378			354			24			6.8	%
Total operating expenses	49,505			52,638			(3,133		)	(6.0	)%
Income from operations	4,262			1,741			2,521			144.8	%
Interest expense	242			189			53			28.0	%
Income before income taxes	4,020			1,552			2,468			159.0	%
Provision for income taxes	1,572			938			634			67.6	%
Net income	$	2,448		$	614		$	1,834		298.7	%
Diluted earnings per common share	$	16.81		$	4.07		$	12.74		313.0	%
Benefit ratio (a)	83.0		%	84.9		%				(1.9	)%
Operating cost ratio (b)	12.3		%	13.3		%				(1.0	)%
Effective tax rate	39.1		%	60.5		%				(21.4	)%

(a) Represents total benefits expense as a percentage of premiums revenue.

(b) Represents total operating costs, excluding depreciation and amortization, as a percentage of total revenues less investment income.

Summary

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Net income was $2.4 billion, or $16.81 per diluted common share, in 2017 compared to $614 million, or $4.07 per diluted common share, in 2016. Net income in 2017 includes a net gain of $4.31 per diluted common share associated with the terminated Merger Agreement consisting primarily of the break-up fee, and the beneficial effect of the lower effective tax rate in light of pricing and benefit design assumptions with the temporary suspension of the health insurance industry fee of $2.15 per diluted common share, excluding the Individual Commercial business impact. The year-over-year comparison was also favorably impacted by a write-off of $2.43 per diluted common share in receivables associated with the commercial risk corridor premium stabilization program, and the reserve strengthening for our non-strategic closed block of long-term care insurance business of $2.11 per common diluted share recorded in 2016. These items were partially offset by the impact of the tax reform law enacted on December 22, 2017, or the Tax Reform Law, which resulted in the reduction of our net income due to the remeasurement of deferred tax assets at lower enacted corporate tax rates of $0.92 per diluted common share, $0.64 per common diluted share in charges associated with both voluntary and involuntary workforce reduction programs in 2017, as well as the estimated guaranty fund assessment expense to support the policyholder obligations of Penn Treaty (an unaffiliated long-term care insurance company) of $0.24 per diluted common share. Excluding the impacts of the items above, the increase in net income primarily was due to year-over-year improvements in earnings for our Individual Commercial, Retail, and Group and Specialty segments, partially offset by lower earnings in the Healthcare Services segment.

Premiums Revenue

Consolidated premiums decreased$641 million, or 1.2%, from 2016 to $52.4 billion for 2017 primarily due to lower premiums in the Individual Commercial segment, partially offset by higher premiums in the Retail segment, primarily resulting from growth in our Medicare Advantage business, and higher premiums in the Group and Specialty segment, as discussed in the detailed segment results discussion that follows.

Services Revenue

Consolidated services revenue increased$13 million, or 1.3%, from 2016 for 2017 primarily due to an increase in services revenue in the Healthcare Services segment, partially offset by a decrease in services revenue in the Group and Specialty segment as discussed in the detailed segment results discussion that follows.

Investment Income

Investment income totaled $405 million for 2017, increasing $16 million, or 4.1%, from 2016, primarily due to higher average invested balances and interest rates in 2017, partially offset by lower realized capital gains.

Benefits Expense

Consolidated benefits expense was $43.5 billion for 2017, a decrease of $1.5 billion, or 3.4%, from 2016 reflecting $505 million in incremental benefits expense for the reserve strengthening in our non-strategic closed block of long-term care insurance policies recorded in 2016. Excluding the long-term care reserve strengthening in 2016, the decrease primarily was due to a decrease in the Individual Commercial segment benefits expense, partially offset by an increase in the Retail and Group and Specialty segments benefits expense as discussed in the detailed segment results discussion that follows. As more fully described herein under the section entitled “Benefits Expense Recognition”, actuarial standards require the use of assumptions based on moderately adverse experience, which generally results in favorable reserve development, or reserves that are considered redundant. We experienced favorable medical claims reserve development related to prior fiscal years of $483 million in 2017 and $582 million in 2016.

The consolidated benefit ratio for 2017 was 83.0%, a decrease of 190 basis points from 2016 primarily due to the incremental benefits expense in 2016 for the reserve strengthening in our non-strategic closed block of long-term care insurance policies. Excluding the impact of the above, the decrease in the consolidated benefit ratio primarily was due to the decrease in the Individual Commercial segment benefit ratio, partially offset by the increase in the Retail and Group and Specialty segment benefit ratio as discussed in the segment results of operation discussion that follows. Favorable prior-period medical claims reserve development decreased the consolidated benefit ratio by approximately 90 basis points in 2017 versus approximately 110 basis points in 2016.

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Operating Costs

Our segments incur both direct and shared indirect operating costs. We allocate the indirect costs shared by the segments primarily as a function of revenues. As a result, the profitability of each segment is interdependent.

Consolidated operating costs decreased$606 million, or 8.4%, from 2016 to $6.6 billion in 2017 primarily due to the temporary suspension of the health insurance industry fee for the calendar year 2017 and lower Individual Commercial membership. This was partially offset by charges associated with both voluntary and involuntary workforce reduction programs, an increase in employee compensation costs resulting from the continued strong performance, increased spending associated with the Medicare Annual Election Period, or AEP, as well as the estimated guaranty fund assessment expense recorded to support the policyholder obligations of Penn Treaty (an unaffiliated long-term care insurance company).

The consolidated operating cost ratio for 2017 was 12.3%, decreasing100 basis points from 2016 primarily due to the temporary suspension of the health insurance industry fee for the calendar year 2017, the write-off of receivables associated with the commercial risk corridor premium stabilization program in 2016, as well as operating cost efficiencies, partially offset by the loss of scale efficiency from market exits in the 2017 period associated with the Individual Commercial product, the estimated charges associated with both voluntary and involuntary workforce reduction programs recorded in 2017, increased employee compensation costs resulting from the continued strong performance, as well as the impact of the estimated guaranty fund assessment expense recorded to support the policyholder obligations of Penn Treaty (an unaffiliated long-term care insurance company). The non-deductible health insurance industry fee impacted the operating cost ratio by 170 basis points in 2016.

Depreciation and Amortization

Depreciation and amortization for 2017 of $378 million was relatively unchanged from 2016.

Interest Expense

Interest expense was $242 million for 2017 compared to $189 million for 2016, an increase of $53 million, or 28.0% due to the issuance of $1.8 billion in senior notes, a portion of the proceeds which were used to redeem $800 million of senior notes scheduled to mature in 2018. We recognized a loss on extinguishment of debt of approximately $17 million in December 2017 for the redemption of these senior notes, which is included in interest expense.

Income Taxes

Our effective tax rate during 2017 was 39.1% compared to the effective tax rate of 60.5% in 2016 primarily reflecting the suspension of the annual health insurance industry fee in 2017, as well as previously non-deductible transaction costs that, as a result of termination of the Merger Agreement, became deductible for tax purposes and were recorded as such in the first quarter of 2017, partially offset by the Tax Reform Law, which increased our effective tax rate due to the remeasurement of deferred tax assets at lower enacted corporate tax rates. See Note 11 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data for a complete reconciliation of the federal statutory rate to the effective tax rate.

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Retail Segment

			Change
	2017	2016	Members		Percentage
Membership:
Medical membership:
Individual Medicare Advantage	2,860,800	2,837,600	23,200		0.8	%
Group Medicare Advantage	441,400	355,400	86,000		24.2	%
Medicare stand-alone PDP	5,308,100	4,951,400	356,700		7.2	%
Total Retail Medicare	8,610,300	8,144,400	465,900		5.7	%
State-based Medicaid	360,100	388,100	(28,000	)	(7.2	)%
Medicare Supplement	235,900	218,800	17,100		7.8	%
Total Retail medical members	9,206,300	8,751,300	455,000		5.2	%

							Change
	2017			2016			Dollars			Percentage
	(in millions)
Premiums and Services Revenue:
Premiums:
Individual Medicare Advantage	$	32,720		$	31,863		$	857		2.7	%
Group Medicare Advantage	5,155			4,283			872			20.4	%
Medicare stand-alone PDP	3,702			4,009			(307		)	(7.7	)%
Total Retail Medicare	41,577			40,155			1,422			3.5	%
State-based Medicaid	2,571			2,640			(69		)	(2.6	)%
Medicare Supplement	478			$	428		50			11.7	%
Total premiums	44,626			43,223			1,403			3.2	%
Services	10			6			4			66.7	%
Total premiums and services revenue	$	44,636		$	43,229		$	1,407		3.3	%
Segment earnings	$	1,978		$	1,690		$	288		17.0	%
Benefit ratio	85.6		%	85.1		%				0.5	%
Operating cost ratio	9.6		%	10.8		%				(1.2	)%

Segment Earnings

• Retail segment earnings were $2.0 billion in 2017, an increase of $288 million, or 17.0%, compared to 2016primarily driven by the year-over-year improvement in our Medicare Advantage business.

Enrollment

• Individual Medicare Advantage membership increased23,200 members, or 0.8%, from December 31, 2016 to December 31, 2017 reflecting net membership additions for Medicare beneficiaries including the effect of planned market and product exits in 2017. We decided certain markets and/or products were not meeting long term strategic and financial objectives. Additionally, membership growth was muted due to competitive actions including the uncertainty associated with the then-pending Merger transaction during last year's AEP.

• Group Medicare Advantage membership increased86,000 members, or 24.2%, from December 31, 2016 to December 31, 2017 reflecting the addition of a large account in January 2017.

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• Medicare stand-alone PDP membership increased356,700 members, or 7.2%, from December 31, 2016 to December 31, 2017 reflecting net membership additions, primarily for our Humana-Walmart plan offering, for the 2017 plan year.

• State-based Medicaid membership decreased28,000 members, or 7.2%, from December 31, 2016 to December 31, 2017 primarily driven by lower membership associated with our Florida contracts resulting from network realignments.

Premiums revenue

• Retail segment premiums increased$1.4 billion, or 3.2%, from 2016 to 2017 primarily due to Medicare Advantage membership growth and increased per-member premiums for certain of the segment's products. Average group and individual Medicare Advantage membership increased 3.4% in 2017. Average membership is calculated by summing the ending membership for each month in a period and dividing the result by the number of months in a period. Premiums revenue reflects changes in membership and average per-member premiums. Items impacting average per-member premiums include changes in premium rates as well as changes in the geographic mix of membership, the mix of product offerings, and the mix of benefit plans selected by our membership.

Benefits expense

• The Retail segment benefit ratio of 85.6% for 2017increased50 basis points from 2016 primarily due to the impact of the temporary suspension of the health insurance industry fee for calendar year 2017 which was contemplated in the pricing and benefit design of our products, margin compression associated with the competitive environment in the group Medicare Advantage business and slightly lower favorable prior-period medical claims reserve development. These increases were partially offset by the impact of planned exits from certain Medicare Advantage markets that carried a higher benefit ratio than other markets as well as lower than expected medical costs as compared to the assumptions used in the pricing of our individual Medicare Advantage business.

• The Retail segment’s benefits expense for 2017 included the beneficial effect of $386 million in favorable prior-year medical claims reserve development versus $429 million in 2016. This favorable prior-year medical claims reserve development decreased the Retail segment benefit ratio by approximately 90 basis points in 2017 versus approximately 100 basis points in 2016.

Operating costs

• The Retail segment operating cost ratio of 9.6% for 2017decreased120 basis points from 2016 primarily due to the temporary suspension of the health insurance industry fee for calendar year 2017, partially offset by increased spending associated with AEP, investments in our integrated care delivery model, and the increase in employee compensation costs resulting from the continued strong performance. The non-deductible health insurance industry fee increased the operating cost ratio by approximately 170 basis points in 2016.

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Group and Specialty Segment

			Change
	2017	2016	Members		Percentage
Membership:
Medical membership:
Fully-insured commercial group	1,097,700	1,136,000	(38,300	)	(3.4	)%
ASO	458,700	573,200	(114,500	)	(20.0	)%
Military services	3,081,800	3,084,100	(2,300	)	(0.1	)%
Total group medical members	4,638,200	4,793,300	(155,100	)	(3.2	)%
Specialty membership (a)	6,986,000	6,961,200	24,800		0.4	%

(a) Specialty products include dental, vision, voluntary benefit products and other supplemental health and financial protection products. Members included in these products may not be unique to each product since members have the ability to enroll in multiple products.

							Change
	2017			2016			Dollars			Percentage
	(in millions)
Premiums and Services Revenue:
Premiums:
Fully-insured commercial group	$	5,462		$	5,405		$	57		1.1	%
Specialty	1,310			1,279			31			2.4	%
Military services	—			12			(12		)	(100.0	)%
Total premiums	6,772			6,696			76			1.0	%
Services	626			643			(17		)	(2.6	)%
Total premiums and services revenue	$	7,398		$	7,339		$	59		0.8	%
Income before income taxes	$	412		$	344		$	68		19.8	%
Benefit ratio	79.2		%	78.2		%				1.0	%
Operating cost ratio	21.4		%	23.5		%				(2.1	)%

Segment Earnings

• Group and Specialty segment earnings were $412 million in 2017, an increase of $68 million, or 19.8%, from $344 million in 2016 primarily reflecting the impact of higher pretax earnings associated with our fully-insured commercial business as well as higher earnings from our military services business resulting from higher performance incentives earned under the TRICARE contract.

Enrollment

• Fully-insured commercial group medical membership decreased38,300 members, or 3.4% from December 31, 2016 reflecting lower membership in small group accounts due in part to more small group accounts selecting ASO products in 2017.

• Group ASO commercial medical membership decreased114,500 members, or 20.0%, from December 31, 2016 to December 31, 2017 primarily due to the loss of certain large group accounts as a result of continued discipline in pricing of services for self-funded accounts amid a highly competitive environment, partially offset by more small group accounts selecting ASO products in 2017.

• Specialty membership increased24,800 members, or 0.4%, from December 31, 2016 to December 31, 2017 primarily due to strong growth in vision products marketed to employer groups.

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Premiums revenue

• Group and Specialty segment premiums increased$76 million, or 1.1%, from 2016 to 2017 primarily due to an increase in group fully-insured commercial medical per-member premiums, partially offset by a decline in average group fully-insured commercial medical membership.

Services revenue

• Group and Specialty segment services revenue decreased$17 million, or 2.6%, from 2016 to 2017 primarily due to a decline in revenue in our group ASO commercial medical business mainly due to membership declines partially offset by higher revenue from our military services business resulting from higher performance incentives earned under the TRICARE contract.

Benefits expense

• The Group and Specialty segment benefit ratio increased100 basis points from 78.2% in 2016 to 79.2% in 2017 primarily due to the impact of the temporary suspension of the health insurance industry fee for calendar year 2017 which was contemplated in the pricing of our products. The increase was further impacted by an increased proportion of small group members transitioning to community rated plans that carry a higher benefit ratio. These increases were partially offset by lower utilization for the fully-insured commercial medical business in 2017, primarily associated with the large group business.

• The Group and Specialty segment’s benefits expense included the beneficial effect of $40 million in favorable prior-year medical claims reserve development in 2017 versus $46 million in 2016. This favorable prior-year medical claims reserve development decreased the Group and Specialty segment benefit ratio by approximately 60 basis points in 2017 versus approximately 70 basis points in 2016.

Operating costs

• The Group and Specialty segment operating cost ratio of 21.4% for 2017decreased210 basis points from 23.5% for 2016, primarily due to the temporary suspension of the health insurance industry fee for calendar year 2017 as well as operating cost efficiencies, partially offset by an increase in employee compensation costs resulting from the continued strong performance. The non-deductible health insurance industry fee increased the operating cost ratio by approximately 150 basis points in 2016.

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Healthcare Services Segment

							Change
	2017			2016			Dollars			Percentage
	(in millions)
Revenues:
Services:
Clinical care services	$	181		$	201		$	(20	)	(10.0	)%
Provider services	77			78			(1		)	(1.3	)%
Pharmacy solutions	80			31			49			158.1	%
Total services revenues	338			310			28			9.0	%
Intersegment revenues:
Pharmacy solutions	20,881			21,952			(1,071		)	(4.9	)%
Provider services	1,593			1,677			(84		)	(5.0	)%
Clinical care services	1,111			1,343			(232		)	(17.3	)%
Total intersegment revenues	23,585			24,972			(1,387		)	(5.6	)%
Total services and intersegment revenues	$	23,923		$	25,282		$	(1,359	)	(5.4	)%
Income before income taxes	$	967		$	1,096		$	(129	)	(11.8	)%
Operating cost ratio	95.5		%	95.2		%				0.3	%

Segment Earnings

• Healthcare Services segment earnings of $967 million for 2017, a decrease of $129 million, or 11.8%, from 2016 primarily due to the impact of the optimization process associated with our chronic care management programs, as well as lower earnings in our provider services business reflecting lower Medicare rates year-over-year in geographies where our provider assets are primarily located. The reductions in pharmacy solutions intersegment revenues were offset by similar reductions in operating costs associated with the pharmacy solutions business.

Script Volume

• Humana Pharmacy Solutions^® script volumes for the Retail and Group and Specialty segment membership increased to approximately 433 million in 2017, up2% versus scripts of approximately 426 million in 2016. The increase primarily reflects growth associated with higher Medicare membership for 2017 than in 2016, partially offset by the decline in Individual Commercial membership.

Services revenue

• Services revenue increased$28 million, or 9.0%, from 2016 to $338 million for 2017 primarily due to service revenue growth from our pharmacy solutions business.

Intersegment revenues

• Intersegment revenues decreased$1.4 billion, or 5.6%, from 2016 to $23.6 billion for 2017 primarily due to care management programs discussed previously, as well as lower revenue in our provider services business reflecting lower Medicare rates year-over-year in geographies where our provider assets are primarily located. Our pharmacy solutions business revenues were impacted by improvements in net pharmacy costs driven by our pharmacy benefit manager and an increase in the generic dispensing rate. These items were partially offset by higher year-over-year script volume from growth in our Medicare Advantage and standalone PDP membership, partially offset by the impact of lower Individual Commercial membership. Our generic dispensing rate improved to 91.3% during 2017 from 90.5% during 2016. The higher generic dispensing rate

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reduced revenues (and operating costs) for our pharmacy solutions business as generic drugs are generally priced lower than branded drugs.

Operating costs

• The Healthcare Services segment operating cost ratio of 95.5% for 2017 was relatively unchanged from 95.2% for 2016.

Individual Commercial Segment

• As announced on February 14, 2017, we exited our Individual Commercial medical business January 1, 2018.

• In 2017, our Individual Commercial segment pretax income was $193 million, an increase of $1.1 billion, from a pretax loss of $869 million in 2016 primarily due to the exit of certain markets in 2017, and per-member premium increases, as well as the reduction of premiums related to the write-off of receivables associated with the commercial risk corridor premium stabilization program.

• Individual commercial medical membership decreased 526,000 members, or 80.3%, from December 31, 2016 to December 31, 2017 reflecting the decline in the number of counties we offered on-exchange coverage and the discontinuance of offering off-exchange products.

• The Individual Commercial segment benefit ratio of 57.4% for 2017decreasedfrom 107.7% in 2016 primarily due to the reduction of premiums related to the write-off of receivables associated with the commercial risk corridor premium stabilization program, as well as the planned exits in 2017 in certain markets that carried a higher benefit ratio and per-member premium increases.

• The Individual Commercial segment operating cost ratio of 21.2% for 2017increased160 basis points from 2016 primarily due to the loss of scale efficiency from market exits in 2017, partially offset by the write-off of receivables associated with the commercial risk corridor premium stabilization program and the temporary suspension of the health insurance industry fee for calendar year 2017.

Other Businesses

As previously disclosed, in the fourth quarter of 2016, we increased future policy benefits expense by approximately $505 million for reserve strengthening associated with our closed block of long-term care insurance policies. This increase primarily was driven by emerging experience indicating longer claims duration, a prolonged lower interest rate environment, and an increase in policyholder life expectancies as discussed further in Note 18 to the consolidated financial statements included in Item 8. Financial Statements and Supplementary Data in this 2018 Form 10-K.

Liquidity

Historically, our primary sources of cash have included receipts of premiums, services revenue, and investment and other income, as well as proceeds from the sale or maturity of our investment securities, borrowings, and proceeds from sales of businesses. Our primary uses of cash historically have included disbursements for claims payments, operating costs, interest on borrowings, taxes, purchases of investment securities, acquisitions, capital expenditures, repayments on borrowings, dividends, and share repurchases. Because premiums generally are collected in advance of claim payments by a period of up to several months, our business normally should produce positive cash flows during periods of increasing premiums and enrollment. Conversely, cash flows would be negatively impacted during periods of decreasing premiums and enrollment. From period to period, our cash flows may also be affected by the timing of working capital items including premiums receivable, benefits payable, and other receivables and payables. Our cash flows are impacted by the timing of payments to and receipts from CMS associated with Medicare Part D subsidies for which we do not assume risk. The use of cash flows may be limited by regulatory requirements of state departments of insurance (or comparable state regulators) which require, among other items, that our regulated subsidiaries maintain minimum levels of capital and seek approval before paying dividends from the subsidiaries to the parent. Our use of cash flows derived from our non-insurance subsidiaries, such as in our Healthcare Services segment, is generally not restricted by state departments of insurance (or comparable state regulators).

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For additional information on our liquidity risk, please refer to Item 1A. – Risk Factors in this 2018 Form 10-K.

Cash and cash equivalents decreased to $2.3 billion at December 31, 2018 from $4.0 billion at December 31, 2017. The change in cash and cash equivalents for the years ended December 31, 2018, 2017 and 2016 is summarized as follows:

	2018			2017			2016
	(in millions)
Net cash provided by operating activities	$	2,173		$	4,051		$	1,936
Net cash used in investing activities	(3,087		)	(2,941		)	(1,362		)
Net cash (used in) provided by financing activities	(785		)	(945		)	732
(Decrease) increase in cash and cash equivalents	$	(1,699	)	$	165		$	1,306

Cash Flow from Operating Activities

The change in operating cash flows over the three year period primarily results from the corresponding change in the timing of working capital items, earnings, and enrollment activity as discussed below. The decrease in operating cash flows in 2018 primarily was due to the receipt of the merger termination fee in 2017, net of related expenses and taxes paid, funding the reinsurance of certain voluntary benefit and financial protection products to a third party in connection with the sale of KMG in 2018, and the timing of working capital items.

The increase in operating cash flows in 2017 primarily was due to the receipt of the merger termination fee, net of related expenses and taxes paid, higher earnings and the timing of working capital items.

The most significant drivers of changes in our working capital are typically the timing of payments of benefits expense and receipts for premiums. We illustrate these changes with the following summaries of benefits payable and receivables.

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The detail of benefits payable was as follows at December 31, 2018, 2017 and 2016:

							Change
	2018		2017		2016		2018			2017			2016
	(in millions)
IBNR (1)	$	3,361	$	3,154	$	3,422	$	207		$	(268	)	$	(308	)
Reported claims in process (2)	617		614		654		3			(40		)	54
Premium deficiency reserve (3)	—		—		—		—			—			(176		)
Other benefits payable (4)	884		900		487		(16		)	413			17
Total benefits payable	$	4,862	$	4,668	$	4,563	194			105			(413		)
Payables from disposition							58			—			—
Change in benefits payable per cash flow statement resulting in cash from operations							$	252		$	105		$	(413	)

(1) IBNR represents an estimate of benefits payable for claims incurred but not reported (IBNR) at the balance sheet date and includes unprocessed claim inventories. The level of IBNR is primarily impacted by membership levels, medical claim trends and the receipt cycle time, which represents the length of time between when a claim is initially incurred and when the claim form is received (i.e. a shorter time span results in a lower IBNR).

(2) Reported claims in process represents the estimated valuation of processed claims that are in the post claim adjudication process, which consists of administrative functions such as audit and check batching and handling, as well as amounts owed to our pharmacy benefit administrator which fluctuate due to bi-weekly payments and the month-end cutoff.

(3) Premium deficiency reserve recognized for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year.

(4) Other benefits payable include amounts owed to providers under capitated and risk sharing arrangements.

The increase in benefits payable in 2018 was primarily due to an increase in IBNR, mainly as a result of Medicare Advantage membership growth. The increase in benefits payable from 2016 to 2017 primarily was due to an increase in the amounts owed to providers under the capitated and risk sharing arrangements. This was partially offset by a decrease in IBNR primarily driven by declines in individual commercial medical membership in the 2017 period, partially offset by an increase in group Medicare Advantage membership. Benefits payable decreased in 2016 primarily due to a decrease in IBNR, as well as the application of 2016 results to the premium deficiency reserve liability recognized in 2015 associated with our individual commercial medical products compliant with the Health Care Reform Law for the 2016 coverage year.

IBNR decreased during 2017 and 2016 primarily due to declines in individual and fully-insured group commercial membership. The decrease in IBNR during 2016 was also impacted by declines in group Medicare Advantage membership.

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The detail of total net receivables was as follows at December 31, 2018, 2017 and 2016:

										Change
	2018			2017			2016			2018			2017			2016
	(in millions)
Medicare	$	836		$	511		$	787		$	325		$	(276	)	$	101
Commercial and other	135			273			579			(138		)	(306		)	39
Military services	123			166			32			(43		)	134			(29		)
Allowance for doubtful accounts	(79		)	(96		)	(118		)	17			22			(3		)
Total net receivables	$	1,015		$	854		$	1,280		161			(426		)	108
Reconciliation to cash flow statement:
Provision for doubtful accounts										36			20			39
Change in receivables disposed from sale of business										3			—			11
Change in receivables per cash flow statement resulting in cash from operations										$	200		$	(406	)	$	158

Medicare receivables are impacted by changes in revenue associated with individual and group Medicare membership changes as well as the timing of accruals and related collections associated with the CMS risk-adjustment model.

The decrease in commercial and other receivables in 2018 as compared to 2017, as well as the decrease in 2017 as compared to 2016, was due primarily to a decrease in our receivable associated with the commercial risk adjustment provision of the Health Care Reform Law. This decrease corresponds with our exit from the Individual Commercial business.

Military services receivables at December 31, 2018, 2017, and 2016 primarily consist of administrative services only fees owed from the federal government for administrative services provided under our TRICARE contracts. The 2017 balance also includes transition-in receivables under our T2017 East Region contract collected in 2018.

Many provisions of the Health Care Reform Law became effective in 2014, including the commercial risk adjustment, risk corridor, and reinsurance provisions as well as the non-deductible health insurance industry fee. The effect of the commercial risk adjustment, risk corridor, and reinsurance provisions of the Health Care Reform law, also known as the 3R's, has impacted our operating cash flows over the last three years, but more significantly in 2017 and 2016 as the temporary risk corridor and reinsurance program provisions phased out in 2016. The timing of payments and receipts associated with these provisions impacted our operating cash flows as we built receivables for each coverage year that were expected to be collected in subsequent coverage years. Net collections under the 3Rs associated with prior coverage years were $8 million in 2018, $440 million in 2017 and $383 million in 2016. The annual health insurance industry fee was suspended for the calendar year 2017, but resumed in calendar year 2018. The annual health insurance industry fee was also suspended for the calendar year 2019 and, under current law, is scheduled to resume in calendar year 2020. We paid the federal government annual health insurance industry fees of $1.04 billion in 2018 and $916 million in 2016.

In addition to the timing of payments of benefits expense, receipts for premiums and services revenues, and amounts due under the risk limiting and health insurance industry fee provisions of the Health Care Reform Law, other items impacting operating cash flows include income tax payments and the timing of payroll cycles.

Cash Flow from Investing Activities

Our ongoing capital expenditures primarily relate to our information technology initiatives, support of services in our provider services operations including medical and administrative facility improvements necessary for activities such as the provision of care to members, claims processing, billing and collections, wellness solutions, care

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coordination, regulatory compliance and customer service. Total capital expenditures, excluding acquisitions, were $612 million in 2018, $524 million in 2017, and $527 million in 2016.

In 2018, we completed the sale of our wholly-owned subsidiary KMG to CGIC. Upon closing, we funded the transaction with approximately $190 million of parent company cash contributed into KMG, subject to customary adjustments, in addition to the transfer of approximately $160 million of statutory capital with the sale. Total cash and cash equivalents, including parent company funding, disposed at the time of sale, was $805 million. See Note 3 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data

During 2018 we paid cash consideration of approximately $1.1 billion to acquire a 40% minority interest in Kindred at Home, $169 million to acquire the remaining interest in MCCI, and $185 million to acquire all of FPG, as discussed in Note 3 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

We reinvested a portion of our operating cash flows in investment securities, primarily investment-grade fixed income securities, totaling $221 million, $2.4 billion, and $828 million during 2018, 2017 and 2016 respectively.

Cash Flow from Financing Activities

Our financing cash flows are significantly impacted by the timing of claims payments and the related receipts from CMS associated with Medicare Part D claim subsidies for which we do not assume risk. Monthly prospective payments from CMS for reinsurance and low-income cost subsidies are based on assumptions submitted with our annual bid. Settlement of the reinsurance and low-income cost subsidies is based on a reconciliation made approximately 9 months after the close of each calendar year. Claims payments were$653 millionhigher than receipts from CMS associated with Medicare Part D claim subsidies for which we do not assume risk during 2018. Receipts from CMS associated with Medicare Part D claims subsidies for which we do not assume risk were $1.9 billion higher than claims payments during 2017 and were $1.1 billion higher than claims payments during 2016. Our net payable for CMS subsidies and brand name prescription drug discounts was $331 million at December 31, 2018 compared to a net payable of $1.0 billion at December 31, 2017.

Under our administrative services only TRICARE contract, reimbursements from the federal government exceeded health care cost payments for which we do not assume risk by $38 million in 2018 and by $11 million in 2017. Health care cost payments for which we do not assume risk exceeded reimbursements from the federal government by $25 million in 2016.

Claims payments associated with cost sharing provisions of the Health Care Reform Law for which we do not assume risk were $25 million in 2018. There were no reimbursements from HHS in 2018. Claims payments associated with cost sharing provisions of the Health Care Reform Law for which we do not assume risk were higher than reimbursements from HHS by $44 million in 2017 and by $28 million in 2016.

We repurchased common shares for $1.09 billion in 2018 and $3.37 billion in 2017 under share repurchase plans authorized by the Board of Directors and in connection with employee stock plans. We did not repurchase shares in 2016 due to restrictions under the Merger Agreement.

As discussed further below, we paid dividends to stockholders of $265 million in 2018, $220 million in 2017, and $177 million in 2016.

We entered into a commercial paper program in October 2014. Net proceeds from the issuance of commercial paper were $485 million in 2018 and the maximum principal amount outstanding at any one time during 2018 was $923 million. Net repayments of commercial paper were $153 million in 2017 and the maximum principal amount outstanding at any one time during 2017 was $500 million. Net repayments of commercial paper were $2 million in 2016 and the maximum principal amount outstanding at any one time during 2016 was $475 million.

In December 2017, we issued $400 million of 2.50% senior notes due December 15, 2020 and $400 million of 2.90% senior notes due December 15, 2022. Our net proceeds, reduced for the underwriters' discount and commission and offering expenses paid as of December 31, 2017, were $794 million. We used the net proceeds, together with

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available cash, to fund the redemption of our $300 million aggregate principal amount of 6.30% senior notes maturing in August 2018 and our $500 million aggregate principal amount of 7.20% senior notes maturing in June 2018 at 100% of the principal amount plus applicable premium for early redemption and accrued and unpaid interest to the redemption date, for cash totaling approximately $829 million.

The remainder of the cash used in or provided by financing activities in 2018, 2017, and 2016 primarily resulted from proceeds from stock option exercises and the change in book overdraft.

Future Sources and Uses of Liquidity

Dividends

For a detailed discussion of dividends to stockholders, please refer to Note 15 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Stock Repurchases

For a detailed discussion of stock repurchases, please refer to Note 15 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Debt

For a detailed discussion of our debt, including our senior notes, credit agreement and commercial paper program, please refer to Note 12 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Liquidity Requirements

We believe our cash balances, investment securities, operating cash flows, and funds available under our credit agreement and our commercial paper program or from other public or private financing sources, taken together, provide adequate resources to fund ongoing operating and regulatory requirements, acquisitions, future expansion opportunities, and capital expenditures for at least the next twelve months, as well as to refinance or repay debt, and repurchase shares.

Adverse changes in our credit rating may increase the rate of interest we pay and may impact the amount of credit available to us in the future. Our investment-grade credit rating at December 31, 2018 was BBB+ according to Standard & Poor’s Rating Services, or S&P, and Baa3 according to Moody’s Investors Services, Inc., or Moody’s. A downgrade by S&P to BB+ or by Moody’s to Ba1 triggers an interest rate increase of 25 basis points with respect to $250 million of our senior notes. Successive one notch downgrades increase the interest rate an additional 25 basis points, or annual interest expense by $1 million, up to a maximum 100 basis points, or annual interest expense by $3 million.

In addition, we operate as a holding company in a highly regulated industry. Humana Inc., our parent company, is dependent upon dividends and administrative expense reimbursements from our subsidiaries, most of which are subject to regulatory restrictions. We continue to maintain significant levels of aggregate excess statutory capital and surplus in our state-regulated operating subsidiaries. Cash, cash equivalents, and short-term investments at the parent company decreased to $578 million at December 31, 2018 from $688 million at December 31, 2017. This decrease primarily reflects acquisitions, common stock repurchases, insurance subsidiaries' capital contributions and capital expenditures, partially offset by insurance subsidiaries dividends, non-insurance subsidiaries' profits and net proceeds from debt issuance. Our use of operating cash derived from our non-insurance subsidiaries, such as our Healthcare Services segment, is generally not restricted by Departments of Insurance (or comparable state regulatory agencies). Our regulated insurance subsidiaries paid dividends to the parent of $2.3 billion in 2018, $1.4 billion in 2017, and $0.8 billion in 2016. Refer to our parent company financial statements and accompanying notes in Schedule I - Parent Company Financial Information. The amount of ordinary dividends that may be paid to our parent company in2019is approximately$1 billion, in the aggregate. Actual dividends paid may vary due to consideration of excess statutory

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capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix.

Regulatory Requirements

For a detailed discussion of our regulatory requirements, including aggregate statutory capital and surplus as well as dividends paid from the subsidiaries to the parent, please refer to Note 15 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Contractual Obligations

We are contractually obligated to make payments for years subsequent to December 31, 2018 as follows:

	Payments Due by Period
	Total		Less than 1 Year		1-3 Years		3-5 Years		More than 5 Years
	(in millions)
Debt	$	6,097	$	1,697	$	400	$	1,000	$	3,000
Interest (1)	8,955		1,926		1,161		914		4,954
Operating leases (2)	519		147		210		112		50
Purchase obligations (3)	736		240		337		159		—
Future policy benefits payable and other long-term liabilities (4)	724		53		444		68		159
Total	$	17,031	$	4,063	$	2,552	$	2,253	$	8,163

(1) Interest includes the estimated contractual interest payments under our debt agreements.

(2) We lease facilities, computer hardware, and other furniture and equipment under long-term operating leases that are noncancelable and expire on various dates through 2046. We sublease facilities or partial facilities to third party tenants for space not used in our operations which partially mitigates our operating lease commitments. See also Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

(3) Purchase obligations include agreements to purchase services, primarily information technology related services, or to make improvements to real estate, in each case that are enforceable and legally binding on us and that specify all significant terms, including: fixed or minimum levels of service to be purchased; fixed, minimum or variable price provisions; and the appropriate timing of the transaction. Purchase obligations exclude agreements that are cancelable without penalty.

(4) Includes future policy benefits payable ceded to third parties through 100% coinsurance agreements as more fully described in Note 19 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data. We expect the assuming reinsurance carriers to fund these obligations and reflected these amounts as reinsurance recoverables included in other long-term assets on our consolidated balance sheet. Amounts payable in less than one year are included in trade accounts payable and accrued expenses in the consolidated balance sheet.

Off-Balance Sheet Arrangements

As of December 31, 2018, we were not involved in any special purpose entity, or SPE, transactions. For a detailed discussion of off-balance sheet arrangements, please refer to Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Guarantees and Indemnifications

For a detailed discussion of our guarantees and indemnifications, please refer to Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

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Government Contracts

For a detailed discussion of our government contracts, including our Medicare, Military, and Medicaid contracts, please refer to Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Critical Accounting Policies and Estimates

The discussion and analysis of our financial condition and results of operations is based upon our consolidated financial statements and accompanying notes, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of these financial statements and accompanying notes requires us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. We continuously evaluate our estimates and those critical accounting policies primarily related to benefits expense and revenue recognition as well as accounting for impairments related to our investment securities, goodwill, and long-lived assets. These estimates are based on knowledge of current events and anticipated future events and, accordingly, actual results ultimately may differ from those estimates. We believe the following critical accounting policies involve the most significant judgments and estimates used in the preparation of our consolidated financial statements.

Benefits Expense Recognition

Benefits expense is recognized in the period in which services are provided and includes an estimate of the cost of services which have been incurred but not yet reported, or IBNR. IBNR represents a substantial portion of our benefits payable as follows:

	December 31, 2018		Percentage of Total		December 31, 2017		Percentage of Total
	(dollars in millions)
IBNR	$	3,361	69.1	%	$	3,154	67.6	%
Reported claims in process	617		12.7	%	614		13.1	%
Other benefits payable	884		18.2	%	900		19.3	%
Total benefits payable	$	4,862	100.0	%	$	4,668	100.0	%

Our reserving practice is to consistently recognize the actuarial best point estimate within a level of confidence required by actuarial standards. For further discussion of our reserving methodology, including our use of completion and claims per member per month trend factors to estimate IBNR, refer to Note 2 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

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The completion and claims per member per month trend factors are the most significant factors impacting the IBNR estimate. The portion of IBNR estimated using completion factors for claims incurred prior to the most recent two months is generally less variable than the portion of IBNR estimated using trend factors. The following table illustrates the sensitivity of these factors assuming moderately adverse experience and the estimated potential impact on our operating results caused by reasonably likely changes in these factors based on December 31, 2018 data:

Completion Factor (a):		Claims Trend Factor (b):
Factor Change (c)	Decrease in Benefits Payable	Factor Change (c)	Decrease in Benefits Payable
(dollars in millions)
0.70%	$(258)	(3.00)%	$(224)
0.60%	$(222)	(2.75)%	$(206)
0.50%	$(185)	(2.50)%	$(187)
0.40%	$(148)	(2.25)%	$(168)
0.30%	$(111)	(2.00)%	$(150)
0.20%	$(74)	(1.75)%	$(131)
0.10%	$(37)	(1.50)%	$(112)

(a) Reflects estimated potential changes in benefits payable at December 31, 2018 caused by changes in completion factors for incurred months prior to the most recent two months.

(b) Reflects estimated potential changes in benefits payable at December 31, 2018 caused by changes in annualized claims trend used for the estimation of per member per month incurred claims for the most recent two months.

(c) The factor change indicated represents the percentage point change.

The following table provides a historical perspective regarding the accrual and payment of our benefits payable, excluding military services. Components of the total incurred claims for each year include amounts accrued for current year estimated benefits expense as well as adjustments to prior year estimated accruals. Refer to Note 10 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data for Retail, Group and Specialty, and Individual Commercial segment tables including information about incurred and paid claims development as of December 31, 2018, net of reinsurance, as well as cumulative claim frequency and the total of IBNR included within the net incurred claims amounts.

	2018			2017			2016
	(in millions)
Balances at January 1	$	4,668		$	4,563		$	4,976
Less: Premium deficiency reserve	—			—			(176		)
Less: Reinsurance recoverables	(70		)	(76		)	(85		)
Balances at January 1, net	4,598			4,487			4,715
Incurred related to:
Current year	46,385			44,001			45,318
Prior years	(503		)	(483		)	(582		)
Total incurred	45,882			43,518			44,736
Paid related to:
Current year	(41,736		)	(39,496		)	(40,852		)
Prior years	(3,977		)	(3,911		)	(4,112		)
Total paid	(45,713		)	(43,407		)	(44,964		)
Reinsurance recoverable	95			70			76
Balances at December 31	$	4,862		$	4,668		$	4,563

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The following table summarizes the changes in estimate for incurred claims related to prior years attributable to our key assumptions. As previously described, our key assumptions consist of trend and completion factors estimated using an assumption of moderately adverse conditions. The amounts below represent the difference between our original estimates and the actual benefits expense ultimately incurred as determined from subsequent claim payments.

	Favorable Development by Changes in Key Assumptions
	2018					2017					2016
	Amount			Factor Change (a)		Amount			Factor Change (a)		Amount			Factor Change (a)
	(dollars in millions)
Trend factors	$	(229	)	(3.3	)%	$	(279	)	(2.7	)%	$	(316	)	(2.9	)%
Completion factors	(274		)	(0.8	)%	(204		)	(0.7	)%	(266		)	(0.9	)%
Total	$	(503	)			$	(483	)			$	(582	)

(a) The factor change indicated represents the percentage point change.

As previously discussed, our reserving practice is to consistently recognize the actuarial best estimate of our ultimate liability for claims. Actuarial standards require the use of assumptions based on moderately adverse experience, which generally results in favorable reserve development, or reserves that are considered redundant. We experienced favorable medical claims reserve development related to prior fiscal years of $503 million in 2018, $483 million in 2017, and $582 million in 2016. The table below details our favorable medical claims reserve development related to prior fiscal years by segment for 2018, 2017, and 2016.

	Favorable Medical Claims Reserve Development									Change
	2018			2017			2016			2018			2017
	(in millions)
Retail Segment	$	(398	)	$	(386	)	$	(429	)	$	(12	)	$	43
Group and Specialty Segment	(46		)	(40		)	(46		)	(6		)	6
Individual Commercial Segment	(57		)	(56		)	(106		)	(1		)	50
Other Businesses	(2		)	(1		)	(1		)	(1		)	—
Total	$	(503	)	$	(483	)	$	(582	)	$	(20	)	$	99

The favorable medical claims reserve development for 2018, 2017, and 2016 primarily reflects the consistent application of trend and completion factors estimated using an assumption of moderately adverse conditions. Our favorable development for each of the years presented above is discussed further in Note 10 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

We continually adjust our historical trend and completion factor experience with our knowledge of recent events that may impact current trends and completion factors when establishing our reserves. Because our reserving practice is to consistently recognize the actuarial best point estimate using an assumption of moderately adverse conditions as required by actuarial standards, there is a reasonable possibility that variances between actual trend and completion factors and those assumed in our December 31, 2018 estimates would fall towards the middle of the ranges previously presented in our sensitivity table.

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Benefits expense excluded from the previous table was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018		2017			2016
	(in millions)
Premium deficiency reserve for short-duration policies	$	—	$	—		$	(176	)
Military services	—		—			8
Future policy benefits	—		(22		)	439
Total	$	—	$	(22	)	$	271

In 2016, we increased our existing premium deficiency reserve, initially recorded in 2015, for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year.

The higher benefits expense associated with future policy benefits payable during 2016 primarily relates to reserve strengthening for our closed block of long-term care insurance policies, which were sold in 2018, as more fully described below and in Note 18 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Revenue Recognition

We generally establish one-year commercial membership contracts with employer groups, subject to cancellation by the employer group on 30-day written notice. Our Medicare contracts with CMS renew annually. Our military services contracts with the federal government and certain contracts with various state Medicaid programs generally are multi-year contracts subject to annual renewal provisions.

We receive monthly premiums from the federal government and various states according to government specified payment rates and various contractual terms. We bill and collect premium from employer groups and members in our Medicare and other individual products monthly. Changes in premium revenues resulting from the periodic changes in risk-adjustment scores derived from medical diagnoses for our membership are estimated by projecting the ultimate annual premium and recognized ratably during the year with adjustments each period to reflect changes in the ultimate premium.

Premiums revenue is estimated by multiplying the membership covered under the various contracts by the contractual rates. Premiums revenue is recognized as income in the period members are entitled to receive services, and is net of estimated uncollectible amounts, retroactive membership adjustments, and adjustments to recognize rebates under the minimum benefit ratios required under the Health Care Reform Law. We estimate policyholder rebates by projecting calendar year minimum benefit ratios for the small group and large group markets, as defined by the Health Care Reform Law using a methodology prescribed by HHS, separately by state and legal entity. Medicare Advantage products are also subject to minimum benefit ratio requirements under the Health Care Reform Law. Estimated calendar year rebates recognized ratably during the year are revised each period to reflect current experience. Retroactive membership adjustments result from enrollment changes not yet processed, or not yet reported by an employer group or the government. We routinely monitor the collectibility of specific accounts, the aging of receivables, historical retroactivity trends, estimated rebates, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. Premiums received prior to the service period are recorded as unearned revenues.

Medicare Risk-Adjustment Provisions

CMS utilizes a risk-adjustment model which apportions premiums paid to Medicare Advantage, or MA, plans according to health severity. The risk-adjustment model, which CMS implemented pursuant to the Balanced Budget Act of 1997(BBA) and the Benefits Improvement and Protection Act of 2000 (BIPA), generally pays more for enrollees with predictably higher costs. Under the risk-adjustment methodology, all MA plans must collect and submit the necessary diagnosis code information from hospital inpatient, hospital outpatient, and physician providers to CMS within prescribed deadlines. The CMS risk-adjustment model uses this diagnosis data to calculate the risk-adjusted premium payment to MA plans. Rates paid to MA plans are established under an actuarial bid model, including a process that bases our payments on a comparison of our beneficiaries’ risk scores, derived from medical diagnoses, to those

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enrolled in the government’s Medicare FFS program. We generally rely on providers, including certain providers in our network who are our employees, to code their claim submissions with appropriate diagnoses, which we send to CMS as the basis for our payment received from CMS under the actuarial risk-adjustment model. We also rely on providers to appropriately document all medical data, including the diagnosis data submitted with claims. CMS is phasing-in the process of calculating risk scores using diagnoses data from the Risk Adjustment Processing System, or RAPS, to diagnoses data from the Encounter Data System, or EDS. The RAPS process requires MA plans to apply a filter logic based on CMS guidelines and only submit diagnoses that satisfy those guidelines. For submissions through EDS, CMS requires MA plans to submit all the encounter data and CMS will apply the risk adjustment filtering logic to determine the risk scores. For 2018, 15% of the risk score was calculated from claims data submitted through EDS. In 2019 and 2020 CMS will increase that percentage to 25% and 50%, respectively.The phase-in from RAPS to EDS could result in different risk scores from each dataset as a result of plan processing issues, CMS processing issues, or filtering logic differences between RAPS and EDS, and could have a material adverse effect on our results of operations, financial position, or cash flows. We estimate risk-adjustment revenues based on medical diagnoses for our membership. The risk-adjustment model, including CMS changes to the submission process, is more fully described in Item 1. – Business under the section titled “Individual Medicare,” and in Item 1A. - Risk Factors.

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Investment Securities

Investment securities totaled $10.4 billion, or 41% of total assets at December 31, 2018, and $12.3 billion, or 45% of total assets at December 31, 2017. Debt securities, detailed below, comprised this entire investment portfolio at December 31, 2018 and 2017. The fair value of debt securities were as follows at December 31, 2018 and 2017:

	12/31/2018		Percentage of Total		12/31/2017		Percentage of Total
	(dollars in millions)
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	417	4.0	%	$	531	4.3	%
Mortgage-backed securities	2,544		24.4	%	1,610		13.1	%
Tax-exempt municipal securities	2,771		26.5	%	3,889		31.6	%
Mortgage-backed securities:
Residential	55		0.5	%	26		0.2	%
Commercial	523		5.0	%	456		3.7	%
Asset-backed securities	985		9.4	%	408		3.3	%
Corporate debt securities	3,142		30.2	%	5,382		43.8	%
Total debt securities	$	10,437	100.0	%	$	12,302	100.0	%

Approximately 97% of our debt securities were investment-grade quality, with a weighted average credit rating of AA by S&P at December 31, 2018. Most of the debt securities that were below investment-grade were rated BB, the higher end of the below investment-grade rating scale. Our investment policy limits investments in a single issuer and requires diversification among various asset types.

Tax-exempt municipal securities included pre-refunded bonds of $118 million at December 31, 2018 and $222 million at December 31, 2017. These pre-refunded bonds were secured by an escrow fund consisting of U.S. government obligations sufficient to pay off all amounts outstanding at maturity. The ratings of these pre-refunded bonds generally assume the rating of the government obligations at the time the fund is established. Tax-exempt municipal securities that were not pre-refunded were diversified among general obligation bonds of U.S. states and local municipalities as well as special revenue bonds. General obligation bonds, which are backed by the taxing power and full faith of the issuer, accounted for $1.4 billion of these municipals in the portfolio. Special revenue bonds, issued by a municipality to finance a specific public works project such as utilities, water and sewer, transportation, or education, and supported by the revenues of that project, accounted for $1.3 billion of these municipals. Our general obligation bonds are diversified across the U.S. with no individual state exceeding 9%.

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Gross unrealized losses and fair values aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows at December 31, 2018:

	Less than 12 months					12 months or more					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in millions)
December 31, 2018
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	179	$	(1	)	$	153	$	(2	)	$	332	$	(3	)
Mortgage-backed securities	956		(16		)	1,019		(38		)	1,975		(54		)
Tax-exempt municipal securities	809		(9		)	1,648		(28		)	2,457		(37		)
Mortgage-backed securities:
Residential	—		—			15		—			15		—
Commercial	372		(8		)	133		(6		)	505		(14		)
Asset-backed securities	824		(7		)	40		—			864		(7		)
Corporate debt securities	1,434		(35		)	1,439		(63		)	2,873		(98		)
Total debt securities	$	4,574	$	(76	)	$	4,447	$	(137	)	$	9,021	$	(213	)

Under the other-than-temporary impairment model for debt securities held, we recognize an impairment loss in income in an amount equal to the full difference between the amortized cost basis and the fair value when we have the intent to sell the debt security or it is more likely than not we will be required to sell the debt security before recovery of our amortized cost basis. However, if we do not intend to sell the debt security, we evaluate the expected cash flows to be received as compared to amortized cost and determine if a credit loss has occurred. In the event of a credit loss, only the amount of the impairment associated with the credit loss is recognized currently in income with the remainder of the loss recognized in other comprehensive income.

When we do not intend to sell a security in an unrealized loss position, potential other-than-temporary impairment is considered using a variety of factors, including the length of time and extent to which the fair value has been less than cost; adverse conditions specifically related to the industry, geographic area or financial condition of the issuer or underlying collateral of a security; payment structure of the security; changes in credit rating of the security by the rating agencies; the volatility of the fair value changes; and changes in fair value of the security after the balance sheet date. For debt securities, we take into account expectations of relevant market and economic data. For example, with respect to mortgage and asset-backed securities, such data includes underlying loan level data and structural features such as seniority and other forms of credit enhancements. A decline in fair value is considered other-than-temporary when we do not expect to recover the entire amortized cost basis of the security. We estimate the amount of the credit loss component of a debt security as the difference between the amortized cost and the present value of the expected cash flows of the security. The present value is determined using the best estimate of future cash flows discounted at the implicit interest rate at the date of purchase. The risks inherent in assessing the impairment of an investment include the risk that market factors may differ from our expectations, facts and circumstances factored into our assessment may change with the passage of time, or we may decide to subsequently sell the investment. The determination of whether a decline in the value of an investment is other than temporary requires us to exercise significant diligence and judgment. The discovery of new information and the passage of time can significantly change these judgments. The status of the general economic environment and significant changes in the national securities markets influence the determination of fair value and the assessment of investment impairment. There is a continuing risk that declines in fair value may occur and additional material realized losses from sales or other-than-temporary impairments may be recorded in future periods.

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All issuers of securities we own that were trading at an unrealized loss at December 31, 2018 remain current on all contractual payments. After taking into account these and other factors previously described, we believe these unrealized losses primarily were caused by an increase in market interest rates in the current markets since the time the securities were purchased. At December 31, 2018, we did not intend to sell the securities with an unrealized loss position in accumulated other comprehensive income, and it is not likely that we will be required to sell these securities before recovery of their amortized cost basis. As a result, we believe that the securities with an unrealized loss were not other-than-temporarily impaired at December 31, 2018. There were no material other-than-temporary impairments in 2018, 2017, or 2016.

Goodwill and Long-lived Assets

At December 31, 2018, goodwill and other long-lived assets represented 23% of total assets and 58% of total stockholders’ equity, compared to 19% and 52%, respectively, at December 31, 2017 with the increase due to our 2018 acquisitions.

We are required to test at least annually for impairment at a level of reporting referred to as the reporting unit, and more frequently if adverse events or changes in circumstances indicate that the asset may be impaired. A reporting unit either is our operating segments or one level below the operating segments, referred to as a component, which comprise our reportable segments. A component is considered a reporting unit if the component constitutes a business for which discrete financial information is available that is regularly reviewed by management. We are required to aggregate the components of an operating segment into one reporting unit if they have similar economic characteristics. Goodwill is assigned to the reporting unit that is expected to benefit from a specific acquisition.

We use the one-step process to review goodwill for impairment to determine both the existence and amount of goodwill impairment, if any. Our strategy, long-range business plan, and annual planning process support our goodwill impairment tests. These tests are performed, at a minimum, annually in the fourth quarter, and are based on an evaluation of future discounted cash flows. We rely on this discounted cash flow analysis to determine fair value. However outcomes from the discounted cash flow analysis are compared to other market approach valuation methodologies for reasonableness. We use discount rates that correspond to a market-based weighted-average cost of capital and terminal growth rates that correspond to long-term growth prospects, consistent with the long-term inflation rate. Key assumptions in our cash flow projections, including changes in membership, premium yields, medical and operating cost trends, and certain government contract extensions, are consistent with those utilized in our long-range business plan and annual planning process. If these assumptions differ from actual, including the impact of the Health Care Reform Law or changes in Government rates, the estimates underlying our goodwill impairment tests could be adversely affected. Goodwill impairment tests completed in each of the last three years did not result in an impairment loss. The fair value of our reporting units with significant goodwill exceeded carrying amounts by a substantial margin. A 100 basis point increase in the discount rate would not have a significant impact on the amount of margin for any of our reporting units with significant goodwill, with the exception of our clinical and provider reporting units in our Healthcare Services segment. The margin on the clinical reporting unit would decline to less than 10% after factoring in a 100 basis point increase in the discount rate. The provider reporting unit, while not falling beneath this threshold, was closer than any of our other reporting units. The clinical and provider reporting units account for $524 million and $730 million, respectively, of goodwill.

Long-lived assets consist of property and equipment and other finite-lived intangible assets. These assets are depreciated or amortized over their estimated useful life, and are subject to impairment reviews. We periodically review long-lived assets whenever adverse events or changes in circumstances indicate the carrying value of the asset may not be recoverable. In assessing recoverability, we must make assumptions regarding estimated future cash flows and other factors to determine if an impairment loss may exist, and, if so, estimate fair value. We also must estimate and make assumptions regarding the useful life we assign to our long-lived assets. If these estimates or their related assumptions change in the future, we may be required to record impairment losses or change the useful life, including accelerating depreciation or amortization for these assets. There were no material impairment losses in the last three years.

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ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our earnings and financial position are exposed to financial market risk, including those resulting from changes in interest rates.

The level of our pretax earnings is subject to market risk due to changes in interest rates and the resulting impact on investment income and interest expense. In the past we have, and in the future we may enter into interest rate swap agreements depending on market conditions and other factors. Amounts borrowed under the revolving credit portion of our $2.0 billion unsecured revolving credit agreement bear interest at either LIBOR plus a spread or the base rate plus a spread. There were no borrowings outstanding under our credit agreement at December 31, 2018 or December 31, 2017.

Interest rate risk also represents a market risk factor affecting our consolidated financial position due to our significant investment portfolio, consisting primarily of fixed maturity securities of investment-grade quality with a weighted average S&P credit rating of AA at December 31, 2018. Our net unrealized position decreased$402 million from a net unrealized gain position of $198 million at December 31, 2017 to a net unrealized loss position of $204 million at December 31, 2018. At December 31, 2018, we had gross unrealized losses of $213 million on our investment portfolio primarily due to an increase in market interest rates since the time the securities were purchased. There were no material other-than-temporary impairments during 2018. While we believe that these impairments are temporary and we currently do not have the intent to sell such securities, given the current market conditions and the significant judgments involved, there is a continuing risk that future declines in fair value may occur and material realized losses from sales or other-than-temporary impairments may be recorded in future periods.

Duration is the time-weighted average of the present value of the bond portfolio’s cash flow. Duration is indicative of the relationship between changes in fair value and changes in interest rates, providing a general indication of the sensitivity of the fair values of our fixed maturity securities to changes in interest rates. However, actual fair values may differ significantly from estimates based on duration. The average duration of our investment portfolio, including cash and cash equivalents, was approximately 2.9 years as of December 31, 2018 and 4.1 years as of December 31, 2017. Based on the duration including cash equivalents, a 1% increase in interest rates would generally decrease the fair value of our securities by approximately $365 million.

We have also evaluated the impact on our investment income and interest expense resulting from a hypothetical change in interest rates of 100, 200, and 300 basis points over the next twelve-month period, as reflected in the following table. The evaluation was based on our investment portfolio and our outstanding indebtedness at December 31, 2018 and 2017. Our investment portfolio consists of cash, cash equivalents, and investment securities. The modeling technique used to calculate the pro forma net change in pretax earnings considered the cash flows related to fixed income investments and debt, which are subject to interest rate changes during a prospective twelve-month period. This evaluation measures parallel shifts in interest rates and may not account for certain unpredictable events that may affect interest income, including unexpected changes of cash flows into and out of the portfolio, changes in the asset allocation, including shifts between taxable and tax-exempt securities, and spread changes specific to various investment categories. In the past ten years, changes in 3 month LIBOR rates during the year have not exceeded 300 basis points, have not changed between 200 and 300 basis points, have changed between 100 and 200 basis points twice, and have changed by less than 100 basis points eight times.

76

	Increase (decrease) in pretax earnings given an interest rate decrease of X basis points									Increase (decrease) in pretax earnings given an interest rate increase of X basis points
	(300)			(200)			(100)			100			200			300
	(in millions)
As of December 31, 2018
Investment income (a)	$	(154	)	$	(114	)	$	(57	)	$	58		$	116		$	175
Interest expense (b)	31			20			10			(10		)	(20		)	(31		)
Pretax	$	(123	)	$	(94	)	$	(47	)	$	48		$	96		$	144
As of December 31, 2017
Investment income (a)	$	(87	)	$	(83	)	$	(67	)	$	67		$	134		$	202
Interest expense (b)	2			2			2			(2		)	(3		)	(5		)
Pretax	$	(85	)	$	(81	)	$	(65	)	$	65		$	131		$	197

(a) As of December 31, 2018 and 2017, some of our investments had interest rates below 3% so the assumed hypothetical change in pretax earnings does not reflect the full 3% point reduction.

(b) The interest rate under our senior notes is fixed. There were no borrowings outstanding under the credit agreement at December 31, 2018 or December 31, 2017. There was $645 million and $150 million outstanding under our commercial paper program at December 31, 2018 and 2017, respectively. As of December 31, 2017, our interest rate under our commercial paper program was less than 2% so the assumed hypothetical change in pretax earnings does not reflect the full 2% point reduction.

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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Humana Inc.

CONSOLIDATED BALANCE SHEETS

	December 31,
	2018			2017
	(in millions, except share amounts)
ASSETS
Current assets:
Cash and cash equivalents	$	2,343		$	4,042
Investment securities	10,026			9,557
Receivables, less allowance for doubtful accounts of $79 in 2018 and $96 in 2017	1,015			854
Other current assets	3,564			2,949
Total current assets	16,948			17,402
Property and equipment, net	1,735			1,584
Long-term investment securities	411			2,745
Equity method investment in Kindred at Home	1,047			—
Goodwill	3,897			3,281
Other long-term assets	1,375			2,166
Total assets	$	25,413		$	27,178
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Benefits payable	$	4,862		$	4,668
Trade accounts payable and accrued expenses	3,067			4,069
Book overdraft	171			141
Unearned revenues	283			378
Short-term debt	1,694			150
Total current liabilities	10,077			9,406
Long-term debt	4,375			4,770
Future policy benefits payable	219			2,923
Other long-term liabilities	581			237
Total liabilities	15,252			17,336
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	—			—
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,594,841 shares issued at December 31, 2018 and 198,572,458 shares issued at December 31, 2017	33			33
Capital in excess of par value	2,535			2,445
Retained earnings	15,072			13,670
Accumulated other comprehensive (loss) income	(159		)	19
Treasury stock, at cost, 63,028,169 shares at December 31, 2018 and 60,893,762 shares at December 31, 2017	(7,320		)	(6,325		)
Total stockholders’ equity	10,161			9,842
Total liabilities and stockholders’ equity	$	25,413		$	27,178

The accompanying notes are an integral part of the consolidated financial statements.

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Humana Inc.

CONSOLIDATED STATEMENTS OF INCOME

	For the year ended December 31,
	2018		2017			2016
	(in millions, except per share results)
Revenues:
Premiums	$	54,941	$	52,380		$	53,021
Services	1,457		982			969
Investment income	514		405			389
Total revenues	56,912		53,767			54,379
Operating expenses:
Benefits	45,882		43,496			45,007
Operating costs	7,525		6,567			7,173
Merger termination fee and related costs, net	—		(936		)	104
Depreciation and amortization	405		378			354
Total operating expenses	53,812		49,505			52,638
Income from operations	3,100		4,262			1,741
Loss on sale of business	786		—			—
Interest expense	218		242			189
Other expense, net	33		—			—
Income before income taxes and equity in net earnings	2,063		4,020			1,552
Provision for income taxes	391		1,572			938
Equity in net earnings of Kindred at Home	11		—			—
Net income	$	1,683	$	2,448		$	614
Basic earnings per common share	$	12.24	$	16.94		$	4.11
Diluted earnings per common share	$	12.16	$	16.81		$	4.07

The accompanying notes are an integral part of the consolidated financial statements.

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Humana Inc.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	For the year ended December 31,
	2018			2017			2016
	(in millions)
Net income	$	1,683		$	2,448		$	614
Other comprehensive income (loss):
Change in gross unrealized investment losses/gains	(189		)	149			(101		)
Effect of income taxes	51			(55		)	38
Total change in unrealized investment gains/losses, net of tax	(138		)	94			(63		)
Reclassification adjustment for net realized gains included in investment income	(53		)	(14		)	(96		)
Effect of income taxes	17			5			35
Total reclassification adjustment, net of tax	(36		)	(9		)	(61		)
Other comprehensive (loss) income, net of tax	(174		)	85			(124		)
Comprehensive income attributable to our equity method investment in Kindred at Home	(4		)	—			—
Comprehensive income	$	1,505		$	2,533		$	490

The accompanying notes are an integral part of the consolidated financial statements.

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Humana Inc.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

	Common Stock			Capital In Excess of Par Value			Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock			Total Stockholders’ Equity
	Issued Shares	Amount
	(dollars in millions, share amounts in thousands)
Balances, January 1, 2016	198,372	$	33	$	2,530		$	11,017		$	58		$	(3,292	)	$	10,346
Net income							614									614
Other comprehensive loss										(124		)				(124		)
Common stock repurchases				—									(104		)	(104		)
Dividends and dividend equivalents				—			(177		)							(177		)
Stock-based compensation				115												115
Restricted stock unit vesting	13	—		(98		)							98			—
Stock option exercises	110	—		13												13
Stock option and restricted stock tax benefit				2												2
Balances, December 31, 2016	198,495	33		2,562			11,454			(66		)	(3,298		)	10,685
Net income							2,448									2,448
Other comprehensive income										85						85
Common stock repurchases				(200		)							(3,165		)	(3,365		)
Dividends and dividend equivalents				—			(232		)							(232		)
Stock-based compensation				157												157
Restricted stock unit vesting	—	—		(138		)							138			—
Stock option exercises	77	—		64												64
Balances, December 31, 2017	198,572	33		2,445			13,670			19			(6,325		)	9,842
Net income							1,683									1,683
Other comprehensive loss							(4		)	(178		)				(182		)
Common stock repurchases				50									(1,140		)	(1,090		)
Dividends and dividend equivalents				—			(277		)							(277		)
Stock-based compensation				137												137
Restricted stock unit vesting	—	—		(145		)							145			—
Stock option exercises	23	—		48												48
Balances, December 31, 2018	198,595	$	33	$	2,535		$	15,072		$	(159	)	$	(7,320	)	$	10,161

The accompanying notes are an integral part of the consolidated financial statements.

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Humana Inc.

CONSOLIDATED STATEMENTS OF CASH FLOW

	For the year ended December 31,
	2018			2017			2016
	(in millions)
Cash flows from operating activities
Net income	$	1,683		$	2,448		$	614
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on sale of business	786			—			—
Net realized capital gains	(90		)	(14		)	(96		)
Equity in net earnings of Kindred at Home	(11		)	—			—
Stock-based compensation	137			157			115
Depreciation	444			410			388
Amortization	90			75			77
Provision (benefit) for deferred income taxes	194			132			(71		)
Provision for doubtful accounts	36			20			39
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	(200		)	406			(158		)
Other assets	(484		)	(582		)	426
Benefits payable	252			105			(413		)
Other liabilities	(676		)	641			937
Unearned revenues	(95		)	98			(84		)
Other	107			155			162
Net cash provided by operating activities	2,173			4,051			1,936
Cash flows from investing activities
Acquisitions, net of cash acquired	(354		)	(31		)	(7		)
Acquisition, equity method investment in Kindred at Home	(1,095		)	—			—
Cash transferred in sale of business	(805		)	—			—
Purchases of property and equipment	(612		)	(524		)	(527		)
Purchases of investment securities	(4,687		)	(6,265		)	(6,566		)
Maturities of investment securities	972			1,111			1,426
Proceeds from sales of investment securities	3,494			2,768			4,312
Net cash used in investing activities	(3,087		)	(2,941		)	(1,362		)
Cash flows from financing activities
(Withdrawals) receipts from contract deposits, net	(640		)	1,823			1,093
Proceeds from issuance of senior notes, net	—			1,779			—
Proceeds from issuance (repayments) of commercial paper, net	485			(153		)	(2		)
Proceeds from term loan	1,000			—			—
Repayment of term loan	(350		)	—			—
Repayment of long-term debt	—			(800		)	—
Common stock repurchases	(1,090		)	(3,365		)	(104		)
Dividends paid	(265		)	(220		)	(177		)
Change in book overdraft	30			(71		)	(89		)
Proceeds from stock option exercises and other, net	45			62			11
Net cash (used in) provided by financing activities	(785		)	(945		)	732
(Decrease) increase in cash and cash equivalents	(1,699		)	165			1,306
Cash and cash equivalents at beginning of year	4,042			3,877			2,571
Cash and cash equivalents at end of year	$	2,343		$	4,042		$	3,877

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Humana Inc.

CONSOLIDATED STATEMENTS OF CASH FLOW—(Continued)

	For the year ended December 31,
	2018			2017		2016
Supplemental cash flow disclosures:	(in millions)
Interest payments	$	195		$	216	$	185
Income tax payments, net	$	631		$	1,498	$	916
Details of businesses acquired in purchase transactions:
Fair value of assets acquired, net of cash acquired	$	392		$	31	$	7
Less: Fair value of liabilities assumed	(38		)	—		—
Cash paid for acquired businesses, net of cash acquired	$	354		$	31	$	7

The accompanying notes are an integral part of the consolidated financial statements.

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. REPORTING ENTITY

Nature of Operations

Humana Inc., headquartered in Louisville, Kentucky, is a leading health and well-being company committed to helping our millions of medical and specialty members achieve their best health. Our successful history in care delivery and health plan administration is helping us create a new kind of integrated care with the power to improve health and well‐being and lower costs. Our efforts are leading to a better quality of life for people with Medicare, families, individuals, military service personnel, and communities at large. To accomplish that, we support physicians and other health care professionals as they work to deliver the right care in the right place for their patients, our members. Our range of clinical capabilities, resources and tools, such as in‐home care, behavioral health, pharmacy services, data analytics and wellness solutions, combine to produce a simplified experience that makes health care easier to navigate and more effective. References throughout these notes to consolidated financial statements to “we,” “us,” “our,” “Company,” and “Humana,” mean Humana Inc. and its subsidiaries. We derived approximately 81% of our total premiums and services revenue from contracts with the federal government in 2018, including 15% related to our federal government contracts with the Centers for Medicare and Medicaid Services, or CMS, to provide health insurance coverage for individual Medicare Advantage members in Florida. CMS is the federal government’s agency responsible for administering the Medicare program.    

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

Our financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America. Our consolidated financial statements include the accounts of Humana Inc. and subsidiaries that the Company controls, including variable interest entities associated with medical practices for which we are the primary beneficiary. We do not own many of our medical practices but instead enter into exclusive management agreements with the affiliated Professional Associations, or P.A.s, that operate these medical practices. Based upon the provisions of these agreements, these affiliated P.A.s are variable interest entities and we are the primary beneficiary, and accordingly we consolidate the affiliated P.A.s. All significant intercompany balances and transactions have been eliminated.

The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America requires us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The areas involving the most significant use of estimates are the estimation of benefits payable, the impact of risk adjustment provisions related to our Medicare contracts, the valuation and related impairment recognition of investmentsecurities, and the valuation and related impairment recognition of long-lived assets, including goodwill. These estimates are based on knowledge of current events and anticipated future events, and accordingly, actual results may ultimately differ materially from those estimates.

Workforce Optimization

During the third quarter of 2017, we initiated a voluntary early retirement program and an involuntary workforce reduction program. These programs impacted approximately 3,600 associates, or 7.8% of our workforce. As a result, in 2017 we recorded charges of $148 million, or $0.64 per diluted common share. At December 31, 2017, $140 million was classified as a current liability, included in our consolidated balance sheet in the trade accounts payable and accrued expenses line. Payments under these programs are being made upon termination during the early retirement or severance pay period. The remaining workforce optimization liability at  December 31, 2018, was $12 million and is expected to be paid in 2019.

Aetna Merger

On February 16, 2017, under the terms of the Agreement and Plan of Merger, or Merger Agreement, with Aetna Inc., and certain wholly owned subsidiaries of Aetna Inc., which we collectively refer to as Aetna, we received a breakup fee of $1 billion from Aetna, which is included in our consolidated statement of income in the line captioned "Merger termination fee and related costs, net."

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Health Care Reform

The Patient Protection and Affordable Care Act and The Health Care and Education Reconciliation Act of 2010 (which we collectively refer to as the Health Care Reform Law) enacted significant reforms to various aspects of the U.S. health insurance industry. Certain of these reforms became effective January 1, 2014, including an annual insurance industry premium-based fee and the establishment of federally-facilitated or state-based exchanges. Operating results for our individual commercial medical business compliant with the Health Care Reform Law were challenged primarily due to unanticipated modifications in the program subsequent to the passing of the Health Care Reform Law, resulting in higher covered population morbidity and the ensuing enrollment and claims issues causing volatility in claims experience. As a result of these and other factors, we exited our individual commercial medical business effective January 1, 2018.

The annual premium-based fee on health insurers is not deductible for tax purposes. We estimate a liability for the health insurance industry fee and record it in full once qualifying insurance coverage is provided in the applicable calendar year in which the fee is payable with a corresponding deferred cost that is amortized ratably to expense over the same calendar year. We record the liability for the health insurance industry fee in trade accounts payable and accrued expenses and record the deferred cost in other current assets in our consolidated financial statements. We pay the health insurance industry fee in September or October of each year. The Consolidated Appropriations Act enacted on December 18, 2015, included a one-time one year suspension in 2017 of the health insurance industry fee. In 2018, we paid the federal government $1.04 billion for the annual health insurance industry fee attributed to calendar year 2018. In 2016, we paid the federal government $916 million for the annual health insurance industry fee attributed to calendar year 2016. The Continuing Resolution bill, H.R. 195, enacted on January 22, 2018, included a one year suspension in 2019 of the health insurance industry fee, but under current law, the fee is scheduled to resume in calendar year 2020.

Cash and Cash Equivalents

Cash and cash equivalents include cash, time deposits, money market funds, commercial paper, other money market instruments, and certain U.S. Government securities with an original maturity of three months or less. Carrying value approximates fair value due to the short-term maturity of the investments.

Investment Securities

Investment securities, which consist entirely of debt securities, have been categorized as available for sale and, as a result, are stated at fair value. Investment securities available for current operations are classified as current assets. Investment securities available for our long-term insurance products and professional liability funding requirements, as well as restricted statutory deposits, are classified as long-term assets. For the purpose of determining gross realized gains and losses, which are included as a component of investment income in the consolidated statements of income, the cost of investment securities sold is based upon specific identification. Unrealized holding gains and losses, net of applicable deferred taxes, are included as a component of stockholders’ equity and comprehensive income until realized from a sale or other-than-temporary impairment.

Under the other-than-temporary impairment model for debt securities held, we recognize an impairment loss in income in an amount equal to the full difference between the amortized cost basis and the fair value when we have the intent to sell the debt security or it is more likely than not we will be required to sell the debt security before recovery of our amortized cost basis. However, if we do not intend to sell the debt security, we evaluate the expected cash flows to be received as compared to amortized cost and determine if a credit loss has occurred. In the event of a credit loss, only the amount of the impairment associated with the credit loss is recognized currently in income with the remainder of the loss recognized in other comprehensive income.

When we do not intend to sell a security in an unrealized loss position, potential other-than-temporary impairment is considered using a variety of factors, including the length of time and extent to which the fair value has been less than cost; adverse conditions specifically related to the industry, geographic area or financial condition of the issuer or underlying collateral of a security; payment structure of the security; changes in credit rating of the security by the rating agencies; the volatility of the fair value changes; and changes in fair value of the security after the balance sheet date. For debt securities, we take into account expectations of relevant market and economic data. For example, with respect to mortgage and asset-backed securities, such data includes underlying loan level data and structural features such as seniority and other forms of

85

Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

credit enhancements. A decline in fair value is considered other-than-temporary when we do not expect to recover the entire amortized cost basis of the security. We estimate the amount of the credit loss component of a debt security as the difference between the amortized cost and the present value of the expected cash flows of the security. The present value is determined using the best estimate of future cash flows discounted at the implicit interest rate at the date of purchase.

Receivables and Revenue Recognition

We generally establish one-year commercial membership contracts with employer groups, subject to cancellation by the employer group on 30-day written notice. Our Medicare contracts with CMS renew annually. Our military services contracts with the federal government and certain contracts with various state Medicaid programs generally are multi-year contracts subject to annual renewal provisions.

Premiums Revenue

We receive monthly premiums from the federal government and various states according to government specified payment rates and various contractual terms. We bill and collect premium from employer groups and members in our Medicare and other individual products monthly. Changes in premium revenues resulting from the periodic changes in risk-adjustment scores derived from medical diagnoses for our membership are estimated by projecting the ultimate annual premium and are recognized ratably during the year, with adjustments each period to reflect changes in the ultimate premium. Receivables or payables are classified as current or long-term in our consolidated balance sheet based on the timing of the expected settlement.

Premiums revenue is estimated by multiplying the membership covered under the various contracts by the contractual rates. Premiums revenue is recognized as income in the period members are entitled to receive services, and is net of estimated uncollectible amounts, retroactive membership adjustments, and adjustments to recognize rebates under the minimum benefit ratios required under the Health Care Reform Law. We estimate policyholder rebates by projecting calendar year minimum benefit ratios for the small group and large group markets, as defined by the Health Care Reform Law using a methodology prescribed by HHS, separately by state and legal entity. Medicare Advantage products are also subject to minimum benefit ratio requirements under the Health Care Reform Law. Estimated calendar year rebates recognized ratably during the year are revised each period to reflect current experience. Retroactive membership adjustments result from enrollment changes not yet processed, or not yet reported by an employer group or the government. We routinely monitor the collectibility of specific accounts, the aging of receivables, historical retroactivity trends, estimated rebates, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. Premiums received prior to the service period are recorded as unearned revenues.

Medicare Part D

We cover prescription drug benefits in accordance with Medicare Part D under multiple contracts with CMS. The payments we receive monthly from CMS and members, which are determined from our annual bid, represent amounts for providing prescription drug insurance coverage. We recognize premiums revenue for providing this insurance coverage ratably over the term of our annual contract. Our CMS payment is subject to risk sharing through the Medicare Part D risk corridor provisions. In addition, receipts for reinsurance and low-income cost subsidies as well as receipts for certain discounts on brand name prescription drugs in the coverage gap represent payments for prescription drug costs for which we are not at risk.

The risk corridor provisions compare costs targeted in our bids to actual prescription drug costs, limited to actual costs that would have been incurred under the standard coverage as defined by CMS. Variances exceeding certain thresholds may result in CMS making additional payments to us or require us to refund to CMS a portion of the premiums we received. As risk corridor provisions are considered in our overall annual bid process, we estimate and recognize an adjustment to premiums revenue related to these provisions based upon pharmacy claims experience. We record a receivable or payable at the contract level and classify the amount as current or long-term in our consolidated balance sheets based on the timing of expected settlement.

Reinsurance and low-income cost subsidies represent funding from CMS in connection with the Medicare Part D program for which we assume no risk. Reinsurance subsidies represent funding from CMS for its portion of prescription drug costs which exceed the member’s out-of-pocket threshold, or the catastrophic coverage level. Low-income cost subsidies represent

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

funding from CMS for all or a portion of the deductible, the coinsurance and co-payment amounts above the out-of-pocket threshold for low-income beneficiaries. Monthly prospective payments from CMS for reinsurance and low-income cost subsidies are based on assumptions submitted with our annual bid. A reconciliation and related settlement of CMS’s prospective subsidies against actual prescription drug costs we paid is made after the end of the year. The Health Care Reform Law mandates consumer discounts of 50% on brand name prescription drugs for Part D plan participants in the coverage gap. These discounts are funded by CMS and pharmaceutical manufacturers while we administer the application of these funds. We account for these subsidies and discounts as a deposit in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2018, subsidy and discount payments of $10.3 billion exceeded reimbursements of $9.6 billion by $0.7 billion. For 2017, subsidy and discount reimbursements of $12.1 billion exceeded payments of $10.2 billion by $1.9 billion. For 2016, subsidy and discount reimbursements of $11.1 billion exceeded payments of $10.0 billion by $1.1 billion. We do not recognize premiums revenue or benefit expenses for these subsidies or discounts. Receipt and payment activity is accumulated at the contract level and recorded in our consolidated balance sheets in other current assets or trade accounts payable and accrued expenses depending on the contract balance at the end of the reporting period.

Settlement of the reinsurance and low-income cost subsidies as well as the risk corridor payment is based on a reconciliation made approximately9months after the close of each calendar year. Settlement with CMS for brand name prescription drug discounts is based on a reconciliation made approximately 14 to 18 months after the close of each calendar year. We continue to revise our estimates with respect to the risk corridor provisions based on subsequent period pharmacy claims data. See Note 7 for detail regarding amounts recorded to our consolidated balance sheets related to the risk corridor settlement and subsidies from CMS with respect to the Medicare Part D program.

Services Revenue

Patient services revenue

Patient services include injury and illness care and related services as well as other healthcare services related to customer needs or as required by law. Patient services revenues are recognized in the period services are provided to the customer and are net of contractual allowances.

Administrative services fees

Administrative services fees cover the processing of claims, offering access to our provider networks and clinical programs, and responding to customer service inquiries from members of self-funded groups. Revenues from providing administration services, also known as administrative services only, or ASO, are recognized in the period services are performed and are net of estimated uncollectible amounts. ASO fees are estimated by multiplying the membership covered under the various contracts by the contractual rates. Under ASO contracts, self-funded employers retain the risk of financing substantially all of the cost of health benefits. However, many ASO customers purchase stop loss insurance coverage from us to cover catastrophic claims or to limit aggregate annual costs. Accordingly, we have recorded premiums revenue and benefits expense related to these stop loss insurance contracts. We routinely monitor the collectibility of specific accounts, the aging of receivables, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. ASO fees received prior to the service period are recorded as unearned revenues.

Under our TRICARE contracts with the Department of Defense (DoD) we provide administrative services, including offering access to our provider networks and clinical programs, claim processing, customer service, enrollment, and other services, while the federal government retains all of the risk of the cost of health benefits. We account for revenues under our contracts net of estimated health care costs similar to an administrative services fee only agreement. Our contracts include fixed administrative services fees and incentive fees and penalties. Administrative services fees are recognized as services are performed. 

Our TRICARE members are served by both in-network and out-of-network providers in accordance with our contracts. We pay health care costs related to these services to the providers and are subsequently reimbursed by the DoD for such payments. We account for the payments of the federal government’s claims and the related reimbursements under deposit accounting in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2018, health care cost reimbursements and payments were each

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approximately $5.6 billion, with reimbursements exceeding payments by $38 million for the year. For 2017, health care cost reimbursements and payments were each approximately$3.4 billion, with reimbursements exceeding payments by $11 million for the year. For 2016, health care cost reimbursements and payments were each approximately $3.3 billion with payments exceeding reimbursements by $25 million for the year.

Receivables

Receivables, including premium receivables, patient services revenue receivables, and ASO fee receivables, are shown net of allowances for estimated uncollectible accounts, retroactive membership adjustments, and contractual allowances.

At December 31, 2018 and 2017, accounts receivable related to services were $123 million and $180 million, respectively. For the year ended December 31, 2018, we had no material bad-debt expense and there were no material contract assets, contract liabilities or deferred contract costs recorded on the consolidated balance sheet at December 31, 2018.

For the year ended December 31, 2018, revenue recognized from performance obligations related to prior periods (for example, due to changes in transaction price), was not material. Further, revenue expected to be recognized in any future year related to remaining performance obligations was not material.

Other Current Assets

Other current assets includes amounts associated with Medicare Part D as discussed above and in Note 7, rebates due from pharmaceutical manufacturers and other amounts due within one year. We accrue pharmaceutical rebates as they are earned based on contractual terms and usage of the product. The balance of pharmaceutical rebates receivable was $1.3 billion at December 31, 2018 and $1.2 billion at December 31, 2017.

Policy Acquisition Costs

Policy acquisition costs are those costs that relate directly to the successful acquisition of new and renewal insurance policies. Such costs include commissions, costs of policy issuance and underwriting, and other costs we incur to acquire new business or renew existing business. We expense policy acquisition costs related to our employer-group prepaid health services policies as incurred. These short-duration employer-group prepaid health services policies typically have a 1-year term and may be canceled upon 30 days notice by the employer group.

Life insurance, annuities, certain health and other supplemental, and, prior to the sale of our KMG subsidiary in 2018, long term care policies sold to individuals are accounted for as long-duration insurance products because they are expected to remain in force for an extended period beyond one year and premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. As a result, we defer policy acquisition costs, primarily consisting of commissions, and amortize them over the estimated life of the policies in proportion to premiums earned. Deferred acquisition costs are reviewed to determine if they are recoverable from future income. See Note 18.

Long-Lived Assets

Property and equipment is recorded at cost. Gains and losses on sales or disposals of property and equipment are included in operating costs. Certain costs related to the development or purchase of internal-use software are capitalized. Depreciation is computed using the straight-line method over estimated useful lives ranging from 3 to 10 years for equipment, 3 to 5 years for computer software, and 10 to 20 years for buildings. Improvements to leased facilities are depreciated over the shorter of the remaining lease term or the anticipated life of the improvement.

We periodically review long-lived assets, including property and equipment and definite-lived intangible assets, for impairment whenever adverse events or changes in circumstances indicate the carrying value of the asset may not be recoverable. Losses are recognized for a long-lived asset to be held and used in our operations when the undiscounted future cash flows expected to result from the use of the asset are less than its carrying value. We recognize an impairment loss based on the excess of the carrying value over the fair value of the asset. A long-lived asset held for sale is reported at the lower of the carrying amount or fair value less costs to sell. Depreciation expense is not recognized on assets held for sale. Losses are

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recognized for a long-lived asset to be abandoned when the asset ceases to be used. In addition, we periodically review the estimated lives of all long-lived assets for reasonableness.

Equity Method Investments

We use the equity method of accounting for equity investments in companies where we are able to exercise significant influence, but not control, over operating and financial policies of the investee. Judgment regarding the level of influence over each equity method investment includes considering key factors such as our ownership interest, representation on the board of directors, organizational structure, participation in policy-making decisions and material intra-entity transactions.

Generally, under the equity method, original investments in these entities are recorded at cost and subsequently adjusted by our share of equity in income or losses after the date of acquisition as well as capital contributions to and distributions from these companies. Our proportionate share of the net income or loss of these companies is included in consolidated net income. Investment amounts in excess of our share of an investee's net assets are amortized over the life of the related asset creating the excess. Excess goodwill is not amortized.

We evaluate equity method investments for impairment whenever events or changes in circumstances indicate that the carrying amount of the investment might not be recoverable. Factors considered by us when reviewing an equity method investment for impairment include the length of time (duration) and the extent (severity) to which the fair value of the equity method investment has been less than carrying value, the investee’s financial condition and near-term prospects and the intent and ability to hold the investment for a period of time sufficient to allow for anticipated recovery. An impairment that is other-than-temporary is recognized in the period identified.

See Note 4 for further information.

Goodwill and Definite-Lived Intangible Assets

Goodwill represents the unamortized excess of cost over the fair value of the net tangible and other intangible assets acquired. We are required to test at least annually for impairment at a level of reporting referred to as the reporting unit, and more frequently if adverse events or changes in circumstances indicate that the asset may be impaired. A reporting unit either is our operating segments or one level below the operating segments, referred to as a component, which comprise our reportable segments. A component is considered a reporting unit if the component constitutes a business for which discrete financial information is available that is regularly reviewed by management. We aggregate the components of an operating segment into one reporting unit if they have similar economic characteristics. Goodwill is assigned to the reporting units that are expected to benefit from the specific synergies of the business combination.

We use the one-step process to review goodwill for impairment to determine both the existence and amount of goodwill impairment, if any. Impairment tests are performed, at a minimum, in the fourth quarter of each year supported by our long-range business plan and annual planning process. We rely on an evaluation of future discounted cash flows to determine fair value of our reporting units. The fair value of our reporting units with significant goodwill exceeded carrying amounts by a substantial margin. A 100 basis point increase in the discount rate would not have a significant impact on the amount of margin for any of our reporting units with significant goodwill, with the exception of our clinical and provider reporting units in our Healthcare Services segment. The margin on the clinical reporting unit would decline to less than 10% after factoring in a 100 basis point increase in the discount rate. The provider reporting unit, while not falling beneath this threshold, was closer than any of our other reporting units. The clinical and provider reporting units account for $524 million and $730 million, respectively, of goodwill. Impairment tests completed for 2018, 2017, and 2016 did not result in an impairment loss.

Definite-lived intangible assets primarily relate to acquired customer contracts/relationships and are included with other long-term assets in the consolidated balance sheets. Definite-lived intangible assets are amortized over the useful life generally using the straight-line method. We review definite-lived intangible assets for impairment under our long-lived asset policy.

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Benefits Payable and Benefits Expense Recognition

Benefits expense includes claim payments, capitation payments, pharmacy costs net of rebates, allocations of certain centralized expenses and various other costs incurred to provide health insurance coverage to members, as well as estimates of future payments to hospitals and others for medical care and other supplemental benefits provided on or prior to the balance sheet date. Capitation payments represent monthly contractual fees disbursed to primary care and other providers who are responsible for providing medical care to members. Pharmacy costs represent payments for members’ prescription drug benefits, net of rebates from drug manufacturers. Receivables for such pharmacy rebates are included in other current assets in our consolidated balance sheets. Other supplemental benefits include dental, vision, and other supplemental health and financial protection products.

We estimate the costs of our benefits expense payments using actuarial methods and assumptions based upon claim payment patterns, medical cost inflation, historical developments such as claim inventory levels and claim receipt patterns, and other relevant factors, and record benefit reserves for future payments. We continually review estimates of future payments relating to claims costs for services incurred in the current and prior periods and make necessary adjustments to our reserves.

Benefits expense is recognized in the period in which services are provided and includes an estimate of the cost of services which have been incurred but not yet reported, or IBNR. Our reserving practice is to consistently recognize the actuarial best point estimate within a level of confidence required by actuarial standards. Actuarial standards of practice generally require a level of confidence such that the liabilities established for IBNR have a greater probability of being adequate versus being insufficient, or such that the liabilities established for IBNR are sufficient to cover obligations under an assumption of moderately adverse conditions. Adverse conditions are situations in which the actual claims are expected to be higher than the otherwise estimated value of such claims at the time of the estimate. Therefore, in many situations, the claim amounts ultimately settled will be less than the estimate that satisfies the actuarial standards of practice.

We develop our estimate for IBNR using actuarial methodologies and assumptions, primarily based upon historical claim experience. Depending on the period for which incurred claims are estimated, we apply a different method in determining our estimate. For periods prior to the most recent two months, the key assumption used in estimating our IBNR is that the completion factor pattern remains consistent over a rolling 12-month period after adjusting for known changes in claim inventory levels and known changes in claim payment processes. Completion factors result from the calculation of the percentage of claims incurred during a given period that have historically been adjudicated as of the reporting period. For the most recent two months, the incurred claims are estimated primarily from a trend analysis based upon per member per month claims trends developed from our historical experience in the preceding months, adjusted for known changes in estimates of recent hospital and drug utilization data, provider contracting changes, changes in benefit levels, changes in member cost sharing, changes in medical management processes, product mix, and weekday seasonality.

The completion factor method is used for the months of incurred claims prior to the most recent two months because the historical percentage of claims processed for those months is at a level sufficient to produce a consistently reliable result. Conversely, for the most recent two months of incurred claims, the volume of claims processed historically is not at a level sufficient to produce a reliable result, which therefore requires us to examine historical trend patterns as the primary method of evaluation. Changes in claim processes, including recoveries of overpayments, receipt cycle times, claim inventory levels, outsourcing, system conversions, and processing disruptions due to weather or other events affect views regarding the reasonable choice of completion factors. Claim payments to providers for services rendered are often net of overpayment recoveries for claims paid previously, as contractually allowed. Claim overpayment recoveries can result from many different factors, including retroactive enrollment activity, audits of provider billings, and/or payment errors. Changes in patterns of claim overpayment recoveries can be unpredictable and result in completion factor volatility, as they often impact older dates of service. The receipt cycle time measures the average length of time between when a medical claim was initially incurred and when the claim form was received. Increases in electronic claim submissions from providers decrease the receipt cycle time. If claims are submitted or processed on a faster (slower) pace than prior periods, the actual claim may be more (less) complete than originally estimated using our completion factors, which may result in reserves that are higher (lower) than required.

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Medical cost trends potentially are more volatile than other segments of the economy. The drivers of medical cost trends include increases in the utilization of hospital facilities, physician services, new higher priced technologies and medical procedures, and new prescription drugs and therapies, as well as the inflationary effect on the cost per unit of each of these expense components. Other external factors such as government-mandated benefits or other regulatory changes, the tort liability system, increases in medical services capacity, direct to consumer advertising for prescription drugs and medical services, an aging population, lifestyle changes including diet and smoking, catastrophes, and epidemics also may impact medical cost trends. Internal factors such as system conversions, claims processing cycle times, changes in medical management practices and changes in provider contracts also may impact our ability to accurately predict estimates of historical completion factors or medical cost trends. All of these factors are considered in estimating IBNR and in estimating the per member per month claims trend for purposes of determining the reserve for the most recent two months. Additionally, we continually prepare and review follow-up studies to assess the reasonableness of the estimates generated by our process and methods over time. The results of these studies are also considered in determining the reserve for the most recent two months. Each of these factors requires significant judgment by management.

We reassess the profitability of our contracts for providing insurance coverage to our members when current operating results or forecasts indicate probable future losses. We establish a premium deficiency reserve in current operations to the extent that the sum of expected future costs, claim adjustment expenses, and maintenance costs exceeds related future premiums under contracts without consideration of investment income. For purposes of determining premium deficiencies, contracts are grouped in a manner consistent with our method of acquiring, servicing, and measuring the profitability of such contracts. Losses recognized as a premium deficiency result in a beneficial effect in subsequent periods as operating losses under these contracts are charged to the liability previously established. Because the majority of our member contracts renew annually, we would not record a material premium deficiency reserve, except when unanticipated adverse events or changes in circumstances indicate otherwise. In 2016, we increased our existing $176 million premium deficiency reserve for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year by $208 million. During 2016, the $384 million current period losses were applied to the premium deficiency liability for the 2016 coverage year.

We believe our benefits payable are adequate to cover future claims payments required. However, such estimates are based on knowledge of current events and anticipated future events. Therefore, the actual liability could differ materially from the amounts provided.

Future policy benefits payable

Future policy benefits payable include liabilities for long-duration insurance policies including life insurance, annuities, certain health and other supplemental, and prior to its sale in 2018, long-term care policies sold to individuals for which some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years.At policy issuance, these reserves are recognized on a net level premium method based on interest rates, mortality, morbidity, and maintenance expense assumptions. Interest rates are based on our expected net investment returns on the investment portfolio supporting the reserves for these blocks of business. Mortality, a measure of expected death, and morbidity, a measure of health status, assumptions are based on industry actuarial tables, modified based upon actual experience. Changes in estimates of these reserves are recognized as an adjustment to benefits expense in the period the changes occur. We perform loss recognition tests at least annually in the fourth quarter, and more frequently if adverse events or changes in circumstances indicate that the level of the liability, together with the present value of future gross premiums, may not be adequate to provide for future expected policy benefits and maintenance costs. During 2016, we recorded a loss for a premium deficiency as discussed further in Note 18.

We adjust future policy benefits payable for the additional liability that would have been recorded if investment securities backing the liability had been sold at their stated aggregate fair value and the proceeds reinvested at current yields. We include the impact of this adjustment, if any, net of applicable deferred taxes, with the change in unrealized investment gain (loss) in accumulated other comprehensive income in stockholders’ equity. Health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model under which policy reserves are not established because premiums received in the current year are intended to pay anticipated benefits in that year. In addition, as previously underwritten members transition to plans compliant with the Health Care Reform Law, it results in policy lapses and the release of reserves for future policy benefits.

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Book Overdraft

Under our cash management system, checks issued but not yet presented to banks that would result in negative bank balances when presented are classified as a current liability in the consolidated balance sheets. Changes in book overdrafts from period to period are reported in the consolidated statement of cash flows as a financing activity.

Income Taxes

We recognize an asset or liability for the deferred tax consequences of temporary differences between the tax bases of assets or liabilities and their reported amounts in the consolidated financial statements. These temporary differences will result in taxable or deductible amounts in future years when the reported amounts of the assets or liabilities are recovered or settled. We also recognize the future tax benefits such as net operating and capital loss carryforwards as deferred tax assets. A valuation allowance is provided against these deferred tax assets if it is more likely than not that some portion or all of the deferred tax assets will not be realized. Future years’ tax expense may be increased or decreased by adjustments to the valuation allowance or to the estimated accrual for income taxes. Deferred tax assets and deferred tax liabilities are further adjusted for changes in the enacted tax rates.

We record tax benefits when it is more likely than not that the tax return position taken with respect to a particular transaction will be sustained. A liability, if recorded, is not considered resolved until the statute of limitations for the relevant taxing authority to examine and challenge the tax position has expired, or the tax position is ultimately settled through examination, negotiation, or litigation. We classify interest and penalties associated with uncertain tax positions in our provision for income taxes.

Stock-Based Compensation

We generally recognize stock-based compensation expense, as determined on the date of grant at fair value, on a straight-line basis over the period during which an employee is required to provide service in exchange for the award (the vesting period). In addition, for awards with both time and performance-based conditions, we generally recognize compensation expense on a straight line basis over the vesting period when it is probable that the performance condition will be achieved. We estimate expected forfeitures and recognize compensation expense only for those awards which are expected to vest. We estimate the grant-date fair value of stock options using the Black-Scholes option-pricing model.

Additional detail regarding our stock-based compensation plans is included in Note 13.

Earnings Per Common Share

We compute basic earnings per common share on the basis of the weighted-average number of unrestricted common shares outstanding. Diluted earnings per common share is computed on the basis of the weighted-average number of unrestricted common shares outstanding plus the dilutive effect of outstanding employee stock options and restricted shares, or units, using the treasury stock method.

Additional detail regarding earnings per common share is included in Note 14.

Fair Value

Assets and liabilities measured at fair value are categorized into a fair value hierarchy based on whether the inputs to valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own assumptions about the assumptions market participants would use. The fair value hierarchy includes three levels of inputs that may be used to measure fair value as described below.

Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt securities that are traded in an active exchange market.

Level 2 – Observable inputs other than Level 1 prices such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than

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exchange-traded instruments as well as debt securities whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data.

Level 3 – Unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. Level 3 includes assets and liabilities whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques reflecting our own assumptions about the assumptions market participants would use as well as those requiring significant management judgment.

Fair value of actively traded debt securities are based on quoted market prices. Fair value of other debt securities are based on quoted market prices of identical or similar securities or based on observable inputs like interest rates generally using a market valuation approach, or, less frequently, an income valuation approach and are generally classified as Level 2. We obtain at least one price for each security from a third party pricing service. These prices are generally derived from recently reported trades for identical or similar securities, including adjustments through the reporting date based upon observable market information. When quoted prices are not available, the third party pricing service may use quoted market prices of comparable securities or discounted cash flow analysis, incorporating inputs that are currently observable in the markets for similar securities. Inputs that are often used in the valuation methodologies include benchmark yields, reported trades, credit spreads, broker quotes, default rates, and prepayment speeds. We are responsible for the determination of fair value and as such we perform analysis on the prices received from the third party pricing service to determine whether the prices are reasonable estimates of fair value. Our analysis includes a review of monthly price fluctuations as well as a quarterly comparison of the prices received from the pricing service to prices reported by our third party investment adviser. In addition, on a quarterly basis we examine the underlying inputs and assumptions for a sample of individual securities across asset classes, credit rating levels, and various durations.

Fair value of privately held debt securities are estimated using a variety of valuation methodologies, including both market and income approaches, where an observable quoted market does not exist and are generally classified as Level 3. For privately-held debt securities, such methodologies include reviewing the value ascribed to the most recent financing, comparing the security with securities of publicly-traded companies in similar lines of business, and reviewing the underlying financial performance including estimating discounted cash flows.

Recently Issued Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board, or FASB, issued new guidance that amends the accounting for revenue recognition. The amendments are intended to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices, and improve disclosure requirements. Insurance contracts are not included in the scope of this new guidance. Accordingly, our premiums revenue and investment income, collectively representing approximately 97% of our consolidated external revenues for the year ended December 31, 2018, are not included in the scope of the new guidance. We adopted the new standard effective January 1, 2018, using the modified retrospective approach. As the majority of our revenues are not subject to the new guidance and the remaining revenues’ accounting treatment did not materially differ from pre-existing accounting treatment, the adoption of the new standard did not have a material impact on our consolidated results of operations, financial condition, cash flows, or related disclosures.

Accounting Pronouncements Effective in Future Periods

In February 2016, the FASB issued new guidance related to accounting for leases which requires lessees to record assets and liabilities reflecting the leased assets and lease obligations, respectively, while following the dual model for recognition in statements of income requiring leases to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) while finance leases will result in a front-loaded expense pattern (similar to current capital leases). We adopted the new standard effective January 1, 2019, as allowed, using the modified retrospective approach. We elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allows us to carryforward the historical lease classification without restating comparative prior periods. We made a permitted accounting policy election to not apply the new guidance to leases with an initial term of 12 months or less. We will recognize those lease payments in the Consolidated Statements of Operations on a straight-line basis over the lease term. The adoption of the standard resulted in recognition of additional lease assets and lease liabilities of

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approximately $470 million as of January 1, 2019. We believe the standard will not materially affect our consolidated net earnings, cash flows and liquidity.

In June 2016, the FASB issued guidance introducing a new model for recognizing credit losses on financial instruments based on an estimate of current expected credit losses. The guidance is effective for us beginning January 1, 2020. The new current expected credit losses (CECL) model generally calls for the immediate recognition of all expected credit losses and applies to loans, accounts and trade receivables as well as other financial assets measured at amortized cost, loan commitments and off-balance sheet credit exposures, debt securities and other financial assets measured at fair value through other comprehensive income, and beneficial interests in securitized financial assets. The new guidance replaces the current incurred loss model for measuring expected credit losses, requires expected losses on available for sale debt securities to be recognized through an allowance for credit losses rather than as reductions in the amortized cost of the securities, and provides for additional disclosure requirements. Our investment portfolio consists of available for sale debt securities. We are currently evaluating the impact on our results of operations, financial condition, and cash flows.

In March 2017, the FASB issued new guidance that amends the accounting for premium amortization on purchased callable debt securities by shortening the amortization period. This amended guidance requires the premium to be amortized to the earliest call date instead of maturity date. The new guidance is effective for us beginning with annual and interim periods in 2019. This guidance will not have a material impact on our results of operations, financial condition or cash flows.

In February 2018, the FASB issued guidance which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the December 22, 2017 enactment of the Tax Cuts and Jobs Act.  The new guidance is effective for us beginning January 1, 2019, with early adoption permitted.  We early adopted this guidance in the first quarter of 2018 and it did not have a material impact on our results of operations, financial condition or cash flows.

In September 2018, the FASB issued new guidance related to accounting for long-duration contracts of insurers which revises key elements of the measurement models and disclosure requirements for long-duration contracts issued by insurers and reinsurers. The new guidance is effective for us beginning with annual and interim periods in 2021, with earlier adoption permitted, and requires retrospective application to previously issued annual and interim financial statements. We are currently evaluating the impact on our results of operations, financial position and cash flows.

There are no other recently issued accounting standards that apply to us or that are expected to have a material impact on our results of operations, financial condition, or cash flows.

3. ACQUISITIONS AND DIVESTITURES

Acquisition of a 40% Minority Interest in Kindred’s Homecare Business

On July 2, 2018, we completed the acquisition of a 40%minority interest in the Kindred at Home Division, or Kindred at Home, of Kindred Healthcare, Inc., or Kindred, for cash consideration of approximately $850 million. TPG Capital, or TPG, and Welsh, Carson, Anderson & Stowe, or WCAS, collectively, the Sponsors, along with us jointly created a consortium to purchase all of the outstanding and issued securities of Kindred. Immediately following the closing of that transaction, Kindred at Home and the Specialty Hospital company were separated, with the result being that the Long Term Acute Care and Rehabilitation businesses (the Specialty Hospital Company) are owned by the Sponsors and Kindred at Home is owned by a joint venture owned by the Sponsors and us.

On July 11, 2018, we, along with the same Kindred at Home Sponsors, TPG and WCAS completed the acquisition of privately-held Curo Health Services, or Curo, one of the nation's leading hospice operators providing care to patients at 245 locations in 22 states. The transaction was structured as a merger of Curo with the hospice business of Kindred at Home, and we thereby purchased a 40%minority interest in Curo for cash consideration of approximately $250 million.

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We account for our 40% investment in Kindred at Home using the equity method of accounting. This investment is reflected as "Equity method investment in Kindred at Home" in our consolidated balance sheets, with our share of income or loss reported as "Equity in net earnings of Kindred at Home" in our consolidated statements of income.

We entered into a shareholders agreement with the Sponsors that provides for certain rights and obligations of each party. The shareholders agreement with the Sponsors includes a put option under which they have the right to require us to purchase their interest in the joint venture starting at the end of year three and ending at the end of year four following the closing. Likewise, we have a call option under which we have the right to require the Sponsors to sell their interest in the joint venture to Humana beginning at the end of 2022 and ending at the end of 2023 following the closing. The put and call options, which are exercisable at a fixed EBITDA multiple and provide a minimum return on the Sponsor's investment if exercised, are measured at fair value each period using a Monte Carlo simulation. The simulation relies on assumptions around Kindred at Home's equity value, risk free interest rates, volatility, and the details specific to the put and call options. The final purchase price allocation resulted in approximately $1 billion being allocated to the investment and $236 million and $291 million allocated to the put and call options, respectively. The fair values of the put option and call option were $224 million and $246 million, respectively, at December 31, 2018. The put option is included within other long-term liabilities and the call option is included within other long-term assets. The change in fair value of the put and call options is reflected as "Other expense, net" in our consolidated statements of income.

Sale of Closed Block of Commercial Long-Term Care Insurance Business

On August 9, 2018, we completed the sale of our wholly-owned subsidiary, KMG America Corporation, or KMG, to Continental General Insurance Company, or CGIC, a Texas-based insurance company wholly owned by HC2 Holdings, Inc., a diversified holding company. KMG's subsidiary, Kanawha Insurance Company, or KIC, includes our closed block of non-strategic commercial long-term care policies. Upon closing, we funded the transaction with approximately $190 million of parent company cash contributed into KMG, subject to customary adjustments, in addition to the transfer of approximately $160 million of statutory capital with the sale. In connection with the sale of KMG, we recognized a pretax loss, including transaction costs, of  $786 million and a corresponding $452 million tax benefit. 

Prior to the sale of KMG, we entered into reinsurance contracts to transfer the risk associated with certain voluntary benefit and financial protection products previously issued primarily by KIC to a third party. We transferred approximately $245 millionof cash to the third party and recorded a commensurate reinsurance recoverable as a result of these transactions. The reinsurance recoverable was included as part of the net assets disposed. There was no material impact to operating results from these reinsurance transactions.

KMG revenues and net income for the 2018 period prior to the date of sale was $182 million and $47 million, respectively. KMG revenues and net loss were $261 million and $117 million, respectively, for the year ended December 31, 2017 and $249 million and $336 million, respectively, for the year ended December 31, 2016.

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The assets and liabilities of KMG that were disposed of on August 9, 2018 were as follows:

	August 9, 2018
Assets	(in millions)
Cash and cash equivalents	$	805
Receivables, net	3
Investment securities	1,576
Other assets	1,085
Total assets disposed	$	3,469
Liabilities
Benefits payable	$	58
Trade accounts payable and accrued expenses	70
Future policy benefits payable	2,573
Total liabilities disposed	$	2,701

Other Acquisitions and Divestitures

On March 1, 2018, we acquired the remaining equity interest in MCCI Holdings, LLC, or MCCI, a privately held management service organization and healthcare provider headquartered in Miami, Florida, that primarily coordinates medical care for Medicare Advantage beneficiaries in Florida and Texas. The purchase price consisted primarily of $169 million cash, as well as our existing investment in MCCI and a note receivable and a revolving note with an aggregate balance of $383 million. This resulted in a preliminary purchase price allocation to goodwill of $483 million, definite-lived intangible assets of $80 million, and net tangible assets of $24 million. The goodwill was assigned to the Retail and Healthcare Services segments. The definite-lived intangible assets, which primarily consist of customer contracts, have an estimated weighted average useful life of 8 years.

On April 10, 2018, we acquired Family Physicians Group, or FPG, for cash consideration of approximately $185 million, net of cash received. FPG serves Medicare Advantage and Managed Medicaid HMO patients in Greater Orlando, Florida with a footprint that includes clinics located in Lake, Orange, Osceola and Seminole counties. This resulted in a preliminary purchase price allocation to goodwill of $133 million, definite-lived intangible assets of $38 million and net tangible assets of $14 million. The goodwill was assigned to the Retail and Healthcare Services segments. The other intangible assets, which primarily consist of customer contracts, have an estimated weighted average useful life of 5 years.

The purchase price allocations for MCCI and FPG are preliminary, subject to receipt and validation of certain tax related analyses.

During 2017 and 2016, we acquired certain other health and wellness related businesses which, individually or in the aggregate, have not had a material impact on our results of operations, financial condition, or cash flows. The results of operations and financial condition of these businesses have been included in our consolidated statements of income and consolidated balance sheets from the respective acquisition dates.

Acquisition-related costs recognized in each of 2018, 2017 and 2016 were not material to our results of operations. Goodwill and definite-lived intangible assets acquired are partially amortizable as deductible expenses for tax purposes. The pro forma financial information assuming the acquisitions had occurred as of the beginning of the calendar year prior to the year of acquisition, as well as the revenues and earnings generated during the year of acquisition, were not material for disclosure purposes.

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4. EQUITY METHOD INVESTMENT

The summarized balance sheet at December 31, 2018 and income statement for the period beginning July 2, 2018 through December 31, 2018 of Kindred at Home in which we hold a 40% equity interest was as follows:

Balance sheet	December 31, 2018
	(in millions)
Current assets	$	536
Non-current assets	4,955
Current liabilities	351
Non-current liabilities	2,708
Shareholders' equity	2,432
Statement of income
	July 2, 2018 through December 31, 2018
	(in millions)
Revenues	$	1,587
Expenses	1,451
Net income	27

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5. INVESTMENT SECURITIES

Investment securities classified as current and long-term were as follows at December 31, 2018 and 2017, respectively:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
December 31, 2018
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	419	$	1	$	(3	)	$	417
Mortgage-backed securities	2,595		3		(54		)	2,544
Tax-exempt municipal securities	2,805		3		(37		)	2,771
Mortgage-backed securities:
Residential	55		—		—			55
Commercial	537		—		(14		)	523
Asset-backed securities	991		1		(7		)	985
Corporate debt securities	3,239		1		(98		)	3,142
Total debt securities	$	10,641	$	9	$	(213	)	$	10,437
December 31, 2017
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	532	$	1	$	(2	)	$	531
Mortgage-backed securities	1,625		4		(19		)	1,610
Tax-exempt municipal securities	3,884		33		(28		)	3,889
Mortgage-backed securities:
Residential	26		—		—			26
Commercial	455		3		(2		)	456
Asset-backed securities	407		1		—			408
Corporate debt securities	5,175		244		(37		)	5,382
Total debt securities	$	12,104	$	286	$	(88	)	$	12,302

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Gross unrealized losses and fair values aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows at December 31, 2018 and 2017, respectively:

	Less than 12 months					12 months or more					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in millions)
December 31, 2018
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	179	$	(1	)	$	153	$	(2	)	$	332	$	(3	)
Mortgage-backed securities	956		(16		)	1,019		(38		)	1,975		(54		)
Tax-exempt municipal securities	809		(9		)	1,648		(28		)	2,457		(37		)
Mortgage-backed securities:
Residential	—		—			15		—			15		—
Commercial	372		(8		)	133		(6		)	505		(14		)
Asset-backed securities	824		(7		)	40		—			864		(7		)
Corporate debt securities	1,434		(35		)	1,439		(63		)	2,873		(98		)
Total debt securities	$	4,574	$	(76	)	$	4,447	$	(137	)	$	9,021	$	(213	)
December 31, 2017
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	273	$	(1	)	$	130	$	(1	)	$	403	$	(2	)
Mortgage-backed securities	581		(2		)	672		(17		)	1,253		(19		)
Tax-exempt municipal securities	1,590		(16		)	661		(12		)	2,251		(28		)
Mortgage-backed securities:
Residential	20		—			3		—			23		—
Commercial	131		(1		)	28		(1		)	159		(2		)
Asset-backed securities	107		—			10		—			117		—
Corporate debt securities	1,297		(10		)	804		(27		)	2,101		(37		)
Total debt securities	$	3,999	$	(30	)	$	2,308	$	(58	)	$	6,307	$	(88	)

Approximately 97% of our debt securities were investment-grade quality, with a weighted average credit rating of AA by S&P at December 31, 2018. Most of the debt securities that were below investment-grade were rated BB, the higher end of the below investment-grade rating scale. Tax-exempt municipal securities were diversified among general obligation bonds of states and local municipalities in the United States as well as special revenue bonds issued by municipalities to finance specific public works projects such as utilities, water and sewer, transportation, or education. Our general obligation bonds are diversified across the United States with no individual state exceeding 9%. Our investment policy limits investments in a single issuer and requires diversification among various asset types.

Our unrealized loss from all securities was generated from approximately 1,210 positions out of a total of approximately 1,500 positions at December 31, 2018. All issuers of securities we own that were trading at an unrealized loss at December 31, 2018 remain current on all contractual payments. After taking into account these and other factors previously described, we believe these unrealized losses primarily were caused by an increase in market interest rates in the current markets since the time the securities were purchased. At December 31, 2018, we did not intend to sell the securities with an unrealized loss position in accumulated other comprehensive income, and it is not likely that we

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will be required to sell these securities before recovery of their amortized cost basis. As a result, we believe that the securities with an unrealized loss were not other-than-temporarily impaired at December 31, 2018.

The detail of realized gains (losses) related to investment securities and included within investment income was as follows for the years ended December 31, 2018, 2017, and 2016:

	2018			2017			2016
	(in millions)
Gross realized gains	$	106		$	35		$	120
Gross realized losses	(16		)	(21		)	(24		)
Net realized capital gains	$	90		$	14		$	96

There were no material other-than-temporary impairments in 2018, 2017, or 2016.

The contractual maturities of debt securities available for sale at December 31, 2018, regardless of their balance sheet classification, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
	(in millions)
Due within one year	$	943	$	941
Due after one year through five years	2,929		2,873
Due after five years through ten years	1,873		1,810
Due after ten years	718		706
Mortgage and asset-backed securities	4,178		4,107
Total debt securities	$	10,641	$	10,437

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6. FAIR VALUE

Financial Assets

The following table summarizes our fair value measurements at December 31, 2018 and 2017, respectively, for financial assets measured at fair value on a recurring basis:

			Fair Value Measurements Using
	Fair Value		Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
	(in millions)
December 31, 2018
Cash equivalents	$	2,024	$	2,024	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	417		—		417		—
Mortgage-backed securities	2,544		—		2,544		—
Tax-exempt municipal securities	2,771		—		2,771		—
Mortgage-backed securities:
Residential	55		—		55		—
Commercial	523		—		523		—
Asset-backed securities	985		—		985		—
Corporate debt securities	3,142		—		3,142		—
Total debt securities	10,437		—		10,437		—
Total invested assets	$	12,461	$	2,024	$	10,437	$	—
December 31, 2017
Cash equivalents	$	4,564	$	4,564	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	531		—		531		—
Mortgage-backed securities	1,610		—		1,610		—
Tax-exempt municipal securities	3,889		—		3,889		—
Mortgage-backed securities:
Residential	26		—		26		—
Commercial	456		—		456		—
Asset-backed securities	408		—		408		—
Corporate debt securities	5,382		—		5,381		1
Total debt securities	12,302		—		12,301		1
Total invested assets	$	16,866	$	4,564	$	12,301	$	1

The table above does not include the fair value of the put and call options associated with our equity investment in Kindred at Home. See Note 3 for further information.

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Financial Liabilities

Our debt is recorded at carrying value in our consolidated balance sheets. The carrying value of our senior notes debt outstanding, net of unamortized debt issuance costs, was $4,774 million at December 31, 2018 and $4,770 million at December 31, 2017. The fair value of our senior note debt was $4,885 million at December 31, 2018 and $5,191 million at December 31, 2017. The fair value of our senior note debt is determined based on Level 2 inputs, including quoted market prices for the same or similar debt, or if no quoted market prices are available, on the current prices estimated to be available to us for debt with similar terms and remaining maturities. Due to the short-term nature, carrying value approximates fair value for our term note and commercial paper borrowings. The term loan outstanding and commercial paper borrowings were $1,295 million at December 31, 2018, compared to $150 million at December 31, 2017.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

As disclosed in Note 3, we acquired MCCI, FPG, and other health and wellness related businesses during 2018, 2017, and 2016. The values of net tangible assets acquired and the resulting goodwill and other intangible assets were recorded at fair value using Level 3 inputs. The majority of the tangible assets acquired and liabilities assumed were recorded at their carrying values as of the respective dates of acquisition, as their carrying values approximated their fair values due to their short-term nature. The fair values of goodwill and other intangible assets acquired in these acquisitions were internally estimated primarily based on the income approach. The income approach estimates fair value based on the present value of the cash flows that the assets are expected to generate in the future. We developed internal estimates for the expected future cash flows and discount rates used in the present value calculations. Other than assets acquired and liabilities assumed in these acquisitions, there were no material assets or liabilities measured at fair value on a nonrecurring basis during 2018, 2017, or 2016.

7. MEDICARE PART D

As discussed in Note 2, we cover prescription drug benefits in accordance with Medicare Part D under multiple contracts with CMS. The accompanying consolidated balance sheets include the following amounts associated with Medicare Part D as of December 31, 2018 and 2017. CMS subsidies/discounts in the table below include the reinsurance and low-income cost subsidies funded by CMS for which we assume no risk as well as brand name prescription drug discounts for Part D plan participants in the coverage gap funded by CMS and pharmaceutical manufacturers.

	2018						2017
	Risk Corridor Settlement			CMS Subsidies/ Discounts			Risk Corridor Settlement			CMS Subsidies/ Discounts
	(in millions)
Other current assets	$	15		$	172		$	4		$	101
Trade accounts payable and accrued expenses	(103		)	(503		)	(255		)	(1,085		)
Net current liability	(88		)	(331		)	(251		)	$	(984	)
Other long-term assets	7			—			—			—
Other long-term liabilities	(89		)	—			(28		)	—
Net long-term liability	(82		)	—			(28		)	—
Total net liability	$	(170	)	$	(331	)	$	(279	)	$	(984	)

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8. PROPERTY AND EQUIPMENT, NET

Property and equipment was comprised of the following at December 31, 2018 and 2017.

	2018			2017
	(in millions)
Land	$	20		$	20
Buildings and leasehold improvements	766			713
Equipment	890			824
Computer software	2,372			2,003
	4,048			3,560
Accumulated depreciation	(2,313		)	(1,976		)
Property and equipment, net	$	1,735		$	1,584

Depreciation expense was $444 million in 2018, $410 million in 2017, and $388 million in 2016, including amortization expense for capitalized internally developed and purchased software of $298 million in 2018, $287 million in 2017, and $255 million in 2016.

9. GOODWILL AND OTHER INTANGIBLE ASSETS

Changes in the carrying amount of goodwill for our reportable segments for the years ended December 31, 2018 and 2017 were as follows:

	Retail		Group and Specialty		Healthcare Services		Total
	(in millions)
Balance at January 1, 2017	$	1,059	$	261	$	1,952	$	3,272
Acquisitions	—		—		9		9
Balance at December 31, 2017	1,059		261		1,961		3,281
Acquisitions	476		—		140		616
Balance at December 31, 2018	$	1,535	$	261	$	2,101	$	3,897

The following table presents details of our other intangible assets included in other long-term assets in the accompanying consolidated balance sheets at December 31, 2018 and 2017.

	Weighted Average Life	2018						2017
		Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
		(in millions)
Other intangible assets:
Customer contracts/relationships	8.7 years	$	646	$	434	$	212	$	566	$	401	$	165
Trade names and technology	6.4 years	84		83		1		104		84		20
Provider contracts	11.8 years	68		37		31		68		30		38
Noncompetes and other	7.3 years	29		28		1		32		29		3
Total other intangible assets	8.7 years	$	827	$	582	$	245	$	770	$	544	$	226

Amortization expense for other intangible assets was approximately $90 million in 2018, $75 million in 2017, and $77 million in 2016. Amortization expense for 2018 included $12 million associated with the write-off of a trade name value reflecting the re-branding of certain provider assets.

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The following table presents our estimate of amortization expense for each of the five next succeeding fiscal years:

	(in millions)
For the years ending December 31,
2019	$	70
2020	67
2021	34
2022	31
2023	18

10. BENEFITS PAYABLE

On a consolidated basis, activity in benefits payable, excluding military services, was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	4,668		$	4,563		$	4,976
Less: Premium deficiency reserve	—			—			(176		)
Less: Reinsurance recoverables	(70		)	(76		)	(85		)
Balances at January 1, net	4,598			4,487			4,715
Incurred related to:
Current year	46,385			44,001			45,318
Prior years	(503		)	(483		)	(582		)
Total incurred	45,882			43,518			44,736
Paid related to:
Current year	(41,736		)	(39,496		)	(40,852		)
Prior years	(3,977		)	(3,911		)	(4,112		)
Total paid	(45,713		)	(43,407		)	(44,964		)
Reinsurance recoverable	95			70			76
Balances at December 31	$	4,862		$	4,668		$	4,563

Amounts incurred related to prior years vary from previously estimated liabilities as the claims ultimately are settled. Negative amounts reported for incurred related to prior years result from claims being ultimately settled for amounts less than originally estimated (favorable development).

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As previously discussed, our reserving practice is to consistently recognize the actuarial best estimate of our ultimate liability for claims. Actuarial standards require the use of assumptions based on moderately adverse experience, which generally results in favorable reserve development, or reserves that are considered redundant. We experienced favorable medical claims reserve development related to prior fiscal years of $503 million in 2018, $483 million in 2017, and $582 million in 2016. The table below details our favorable medical claims reserve development related to prior fiscal years by segment for 2018, 2017, and 2016.

	Favorable Medical Claims Reserve Development
	2018			2017			2016
Retail Segment	$	(398	)	$	(386	)	$	(429	)
Group and Specialty Segment	(46		)	(40		)	(46		)
Individual Commercial Segment	(57		)	(56		)	(106		)
Other Businesses	(2		)	(1		)	(1		)
Total	$	(503	)	$	(483	)	$	(582	)

The favorable medical claims reserve development for 2018, 2017, and 2016 primarily reflects the consistent application of trend and completion factors estimated using an assumption of moderately adverse conditions. Favorable prior period development primarily resulted from our Medicare Advantage and individual commercial medical businesses.

Benefits expense excluded from the previous table was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018		2017			2016
	(in millions)
Premium deficiency reserve for short-duration policies	$	—	$	—		$	(176	)
Military services	—		—			8
Future policy benefits	—		(22		)	439
Total	$	—	$	(22	)	$	271

Military services benefits expense for 2016 in the table above reflect expenses associated with our contracts with the Veterans Administration.

The higher benefits expense associated with future policy benefits payable during 2016 primarily relates to reserve strengthening for our closed block of long-term care insurance policies, which were sold in 2018, as more fully described in Note 18.

Incurred and Paid Claims Development

The following discussion provides information about incurred and paid claims development for our segments as of December 31, 2018, net of reinsurance, as well as cumulative claim frequency and the total of IBNR included within the net incurred claims amounts. The information about incurred and paid claims development for the years ended December 31,2016 and 2017 is presented as supplementary information.

Claims frequency is measured as medical fee-for-service claims for each service encounter with a unique provider identification number. Our claims frequency measure includes claims covered by deductibles as well as claims under capitated arrangements. Claim counts may vary based on product mix and the percentage of delegated capitation arrangements.

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Retail Segment

Activity in benefits payable for our Retail segment was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	3,963		$	3,506		$	3,600
Less: Reinsurance recoverables	(70		)	(76		)	(85		)
Balances at January 1, net	3,893			3,430			3,515
Incurred related to:
Current year	41,323			38,604			37,212
Prior years	(398		)	(386		)	(429		)
Total incurred	40,925			38,218			36,783
Paid related to:
Current year	(37,189		)	(34,781		)	(33,784		)
Prior years	(3,386		)	(2,974		)	(3,084		)
Total paid	(40,575		)	(37,755		)	(36,868		)
Reinsurance recoverable	95			70			76
Balances at December 31	$	4,338		$	3,963		$	3,506

At December 31, 2018, benefits payable for our Retail segment included IBNR of approximately $2.9 billion, primarily associated with claims incurred in 2018. The cumulative number of reported claims as of December 31, 2018 was approximately 104.3 million for claims incurred in 2018, 102.1 million for claims incurred in 2017, and 96.2 million for claims incurred in 2016.

The following tables provide information about incurred and paid claims development for the Retail segment as of December 31, 2018, net of reinsurance.

	Incurred Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	37,212	$	36,891	$	36,811
2017			38,604		38,341
2018					41,323
Total					$	116,475

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	Cumulative Paid Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	33,784	$	36,841	$	36,811
2017			34,781		38,232
2018					37,189
Total					$	112,232
All outstanding benefit liabilities before 2015, net of reinsurance					N/A
Benefits payable, net of reinsurance					$	4,243

Group and Specialty Segment

Activity in benefits payable for our Group and Specialty segment, excluding military services, was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	568		$	579		$	616
Less: Reinsurance recoverables	—			—			—
Balances at January 1, net	568			579			616
Incurred related to:
Current year	5,466			5,403			5,271
Prior years	(46		)	(40		)	(46		)
Total incurred	5,420			5,363			5,225
Paid related to:
Current year	(4,957		)	(4,843		)	(4,700		)
Prior years	(514		)	(531		)	(562		)
Total paid	(5,471		)	(5,374		)	(5,262		)
Balances at December 31	$	517		$	568		$	579

At December 31, 2018, benefits payable for our Group and Specialty segment included IBNR of approximately $448 million, primarily associated with claims incurred in 2018. The cumulative number of reported claims as of December 31, 2018 was approximately 10.4 million for claims incurred in 2018, 11.1 million for claims incurred in 2017, and 12.9 million for claims incurred in 2016.

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The following tables provide information about incurred and paid claims development for the Group and Specialty segment as of December 31, 2018, net of reinsurance.

	Incurred Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	5,271	$	5,234	$	5,235
2017			5,403		5,358
2018					5,466
Total					$	16,059

	Cumulative Paid Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	4,700	$	5,226	$	5,234
2017			4,843		5,351
2018					4,957
Total					$	15,542
All outstanding benefit liabilities before 2015, net of reinsurance					N/A
Benefits payable, net of reinsurance					$	517

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Individual Commercial Segment

Activity in benefits payable for ourIndividual Commercial segment, was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	101		$	454		$	741
Less: Premium deficiency reserve	—			—			(176		)
Balances at January 1, net	101			454			565
Incurred related to:
Current year	—			669			3,677
Prior years	(56		)	(56		)	(106		)
Total incurred	(56		)	613			3,571
Paid related to:
Current year	—			(583		)	(3,233		)
Prior years	(38		)	(383		)	(449		)
Total paid	(38		)	(966		)	(3,682		)
Balances at December 31	$	7		$	101		$	454

At December 31, 2018, benefits payable for our Individual Commercial segment included IBNR of approximately $1 million, associated with claims prior to 2018. The cumulative number of reported claims as of December 31, 2017 was approximately 2.2 million for claims incurred in 2017 and 9.5 million for claims incurred in 2016.

The following tables provide information about incurred and paid claims development for the Individual Commercial segment as of December 31, 2018, net of reinsurance.

	Incurred Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	3,677	$	3,621	$	3,609
2017			669		627
2018					—
Total					$	4,236

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	Cumulative Paid Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	3,233	$	3,606	$	3,609
2017			583		620
2018					—
Total					$	4,229
All outstanding benefit liabilities before 2015, net of reinsurance					N/A
Benefits payable, net of reinsurance					$	7

Reconciliation to Consolidated

The reconciliation of the net incurred and paid claims development tables to benefits payable in the consolidated statement of financial position is as follows:    

	December 31, 2018
Net outstanding liabilities
Retail	$	4,243
Group and Specialty	517
Individual Commercial	7
Benefits payable, net of reinsurance	4,767
Reinsurance recoverable on unpaid claims
Retail	95
Total benefits payable, gross	$	4,862

11. INCOME TAXES

The provision for income taxes consisted of the following for the years ended December 31, 2018, 2017 and 2016:

	2018		2017		2016
	(in millions)
Current provision:
Federal	$	139	$	1,324	$	921
States and Puerto Rico	58		116		88
Total current provision	197		1,440		1,009
Deferred expense (benefit)	194		132		(71		)
Provision for income taxes	$	391	$	1,572	$	938

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The provision for income taxes was different from the amount computed using the federal statutory rate for the years ended December 31, 2018, 2017 and 2016 due to the following:

	2018			2017			2016
	(in millions)
Income tax provision at federal statutory rate	$	436		$	1,407		$	543
States, net of federal benefit, and Puerto Rico	42			80			41
Tax exempt investment income	(11		)	(22		)	(20		)
Health insurance industry fee	243			—			336
Nondeductible executive compensation	17			36			30
Tax reform	(39		)	133			—
KMG sale	(272		)	—			—
Other, net	(25		)	(62		)	8
Provision for income taxes	$	391		$	1,572		$	938

The tax reform law enacted on December 22, 2017 (the "Tax Reform Law") reduced the statutory federal corporate income tax rate to 21 percent from 35 percent, beginning in 2018, and required a mandatory deemed repatriation of undistributed foreign earnings. The rate reduction required a remeasurement of our net deferred tax asset. These items resulted in an estimated increase in our 2017 tax provision of approximately $133 million, including approximately $10 million for the deemed repatriation tax imposed on the undistributed earnings of our Puerto Rico operations. Revisions to our prior estimate for the income tax effects of the Tax Reform Law decreased our 2018 tax provision by approximately $39 million.

The incremental tax benefit on the sale of KMG of $272 million resulted from a tax loss higher than the loss recorded in the statement of income for the year ended December 31, 2018 due to a higher tax basis in KMG than book basis. In addition, the amount reflects our ability to carryback the capital loss to tax years 2015, 2016 and 2017 at the historical tax rate of 35 percent instead of the current tax rate of 21 percent.

Deferred income tax balances reflect the impact of temporary differences between the tax bases of assets or liabilities and their reported amounts in our consolidated financial statements, and are stated at enacted tax rates expected to be in effect when the reported amounts are actually recovered or settled.

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Principal components of our net deferred tax balances at December 31, 2018 and 2017 were as follows:

	Assets (Liabilities)
	2018			2017
	(in millions)
Compensation and other accrued expense	$	89		$	138
Benefits payable	79			113
Investment securities	44			—
Net operating loss carryforward	38			53
Capital loss carryforward	15			—
Deferred acquisition costs	17			48
Unearned revenues	9			12
Other	8			1
Future policy benefits payable	—			231
Total deferred income tax assets	299			596
Valuation allowance	(54		)	(49		)
Total deferred income tax assets, net of valuation allowance	245			547
Depreciable property and intangible assets	(273		)	(237		)
Prepaid expenses	(52		)	(44		)
Future policy benefits payable	(5		)	—
Investment securities	—			(49		)
Total deferred income tax liabilities	(330		)	(330		)
Total net deferred income tax assets/(liabilities)	$	(85	)	$	217

All deferred tax liabilities and assets are classified as noncurrent in our consolidated balance sheets as other long-term liabilities at December 31, 2018 and as other long-term assets at December 31, 2017.

At December 31, 2018, we had approximately $104 million of net operating losses and $64 million of capital losses to carry forward. These loss carryforwards, if not used to offset future taxable income or capital gain, will expire from 2019 through 2037. Due to limitations and uncertainty regarding our ability to use some of the loss carryforwards and certain other deferred tax assets, a valuation allowance of $54 million was established. For the remainder of the net operating loss carryforwards and other cumulative temporary differences, based on our historical record of producing taxable income and profitability, we have concluded that future operating income will be sufficient to give rise to tax expense to recover these deferred tax assets.

We file income tax returns in the United States and Puerto Rico. The U.S. Internal Revenue Service, or IRS, has completed its examinations of our consolidated income tax returns for 2016 and prior years. Our 2017 tax return is in the post-filing review period under the Compliance Assurance Process, or CAP. Our 2018 tax return is under advance review by the IRS under CAP. With a few exceptions, which are immaterial in the aggregate, we no longer are subject to state, local and foreign tax examinations for years before 2015. We are not aware of any material adjustments that may be proposed as a result of any ongoing or future examinations. We do not have material uncertain tax positions reflected in our consolidated balance sheets.

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12. DEBT

The carrying value of debt outstanding was as follows at December 31, 2018 and 2017:

	2018		2017
	(in millions)
Short-term debt:
Commercial paper	$	645	150
Term note	650		—
Senior note:
$400 million, 2.625% due October 1, 2019	399		—
Total short-term debt	$	1,694	$	150
Long-term debt:
Senior notes:
$400 million, 2.625% due October 1, 2019	$	—	$	399
$400 million, 2.50% due December 15, 2020	398		397
$400 million, 2.90% due December 15, 2022	396		396
$600 million, 3.15% due December 1, 2022	596		595
$600 million, 3.85% due October 1, 2024	597		595
$600 million, 3.95% due March 15, 2027	594		594
$250 million, 8.15% due June 15, 2038	263		263
$400 million, 4.625% due December 1, 2042	396		396
$750 million, 4.95% due October 1, 2044	739		739
$400 million, 4.80% due March 15, 2047	396		396
Total long-term debt	$	4,375	$	4,770

Maturities of the short-term and long-term debt for the years ending December 31, are as follows:

For the years ending December 31,	(in millions)
2019	$	1,697
2020	400
2021	—
2022	1,000
2023	—
Thereafter	3,000

Senior Notes

Our senior notes, which are unsecured, may be redeemed at our option at any time at 100% of the principal amount plus accrued interest and a specified make-whole amount. The 8.15% senior notes are subject to an interest rate adjustment if the debt ratings assigned to the notes are downgraded (or subsequently upgraded). In addition, our senior notes contain a change of control provision that may require us to purchase the notes under certain circumstances. We recognized a loss on extinguishment of debt of approximately$17 million in 2017 for the early redemption of senior notes, which is included in interest expense in the consolidated statements of income.

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Credit Agreement

Our 5-year, $2.0 billion unsecured revolving credit agreement expires May 2022. Under the credit agreement, at our option, we can borrow on either a competitive advance basis or a revolving credit basis. The revolving credit portion bears interest at either LIBOR plus a spread or the base rate plus a spread. The LIBOR spread, currently 110.0 basis points, varies depending on our credit ratings ranging from 91.0 to 150.0 basis points. We also pay an annual facility fee regardless of utilization. This facility fee, currently 15.0 basis points, may fluctuate between 9.0 and 25.0 basis points, depending upon our credit ratings. The competitive advance portion of any borrowings will bear interest at market rates prevailing at the time of borrowing on either a fixed rate or a floating rate based on LIBOR, at our option.

The terms of the credit agreement include standard provisions related to conditions of borrowing which could limit our ability to borrow additional funds. In addition, the credit agreement contains customary restrictive covenants and a financial covenant regarding maximum debt to capitalization of 50% as well as customary events of default. We are in compliance with this financial covenant, with an actual debt to capitalization of 37% as measured in accordance with the credit agreement as of December 31, 2018. Upon our agreement with one or more financial institutions, we may expand the aggregate commitments under the credit agreement to a maximum of $2.5 billion, through a $500 million incremental loan facility.

At December 31, 2018, we had no borrowings and no letters of credit outstanding under the credit agreement. Accordingly, as of December 31, 2018, we had $2 billionof remaining borrowing capacity (which excludes the uncommitted $500 million incremental loan facility under the credit agreement), none of which would be restricted by our financial covenant compliance requirement. We have other customary, arms-length relationships, including financial advisory and banking, with some parties to the credit agreement.

Commercial Paper

    Under our commercial paper program we may issue short-term, unsecured commercial paper notes privately placed on a discount basis through certain broker dealers at any time not to exceed $2 billion. Amounts available under the program may be borrowed, repaid and re-borrowed from time to time. The net proceeds of issuances have been and are expected to be used for general corporate purposes. The maximum principal amount outstanding at any one time during the year endedDecember 31, 2018 was $923 million, with $645 million outstanding at December 31, 2018 compared to $150 million outstanding at December 31, 2017. The outstanding commercial paper at December 31, 2018 had a weighted average annual interest rate of 3.06%.

Term Note

In November 2018, we entered into a $1.0 billion term note agreement with a bank at a variable rate of interest due within one year. We may elect to incur interest at either the bank's base rate or LIBOR plus 115 basis points. The base rate is defined as the higher of the daily federal funds rate plus 50 basis points; or the bank's prime rate; or LIBOR plus 100 basis points. The interest rate in effect at December 31, 2018 was 3.67%. The note is prepayable without penalty. Proceeds were primarily used to fund the November 2018 accelerated stock repurchase agreement. We repaid $350 million prior to December 31, 2018. The term note shares the customary terms and provisions as well as financial covenants of our Credit Agreement, as discussed above.

13. EMPLOYEE BENEFIT PLANS

Employee Savings Plan

We have defined contribution retirement savings plans covering eligible employees which include matching contributions based on the amount of our employees’ contributions to the plans. The cost of these plans amounted to approximately $197 million in 2018, $217 million in 2017, and $196 million in 2016. The Company’s cash match is invested pursuant to the participant’s contribution direction. Based on the closing price of our common stock of $286.48 on December 31, 2018, approximately 12% of the retirement and savings plan’s assets were invested in our common stock, or approximately 1.8 million shares, representing approximately 1.3% of the shares outstanding as of

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December 31, 2018. At December 31, 2018, approximately 2.0 million shares of our common stock were reserved for issuance under our defined contribution retirement savings plans.

Stock-Based Compensation

We have plans under which options to purchase our common stock and restricted stock units have been granted to executive officers, directors and key employees. Awards generally require both a change in control and termination of employment within 2 years of the date of the change in control to accelerate the vesting, including those granted to retirement-eligible participants.

The terms and vesting schedules for stock-based awards vary by type of grant. Generally, the awards vest upon time-based conditions. We have also granted awards to certain employees that vest upon a combination of time and performance-based conditions. The stock awards of retirement-eligible participants are generally earned ratably over the service period for each tranche. Accordingly, upon retirement the earned portion of the current tranche will continue to vest on the originally scheduled vest date and any remaining unearned portion of the award will be forfeited. Our equity award program includes a retirement provision that generally treats employees with a combination of age and years of services with the Company totaling 65 or greater, with a minimum required age of 55 and a minimum requirement of 5 years of service, as retirement-eligible. Upon exercise, stock-based compensation awards are settled with authorized but unissued company stock or treasury stock.

The compensation expense that has been charged against income for these plans was as follows for the years ended December 31,2018, 2017, and 2016:

	2018			2017			2016
	(in millions)
Stock-based compensation expense by type:
Restricted stock	$	124		$	145		$	106
Stock options	13			12			9
Total stock-based compensation expense	137			157			115
Tax benefit recognized	(21		)	(32		)	(20		)
Stock-based compensation expense, net of tax	$	116		$	125		$	95

Stock-based compensation expense for certain restricted stock in 2017 included a $29 million modification expense for certain awards.

The tax benefit recognized in our consolidated financial statements is based on the amount of compensation expense recorded for book purposes, subject to limitations on the deductibility of annual compensation in excess of $500,000 per employee as mandated by the Health Care Reform Law. The actual tax benefit realized in our tax return is based on the intrinsic value, or the excess of the market value over the exercise or purchase price, of stock options exercised and restricted stock vested during the period, subject to limitations on the deductibility of annual compensation in excess of $500,000 per employee as mandated by the Health Care Reform Law. The actual tax benefit realized for the deductions taken on our tax returns from option exercises and restricted stock vesting totaled $49 million in 2018, $68 million in 2017, and $53 million in 2016. There was no capitalized stock-based compensation expense during these years.

At December 31, 2018, there were 13.1 million shares reserved for stock award plans. These reserved shares included giving effect to, under the 2011 Plan, 4.7 million shares of common stock available for future grants assuming all stock options were granted or 2.0 million shares available for future grants assuming all restricted stock were granted. Shares may be issued from authorized but unissued company stock or treasury stock.

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Restricted Stock

Restricted stock is granted with a fair value equal to the market price of our common stock on the date of grant and generally vests in equal annual tranches over a three year period from the date of grant. Certain of our restricted stock grants also include performance-based conditions generally associated with return on invested capital and strategic membership growth. Restricted stock units have forfeitable dividend equivalent rights equal to the dividend paid on common stock. The weighted-average grant date fair value of our restricted stock was $276.62 in 2018, $222.35 in 2017, and $168.12 in 2016. Activity for our restricted stock was as follows for the year ended December 31, 2018:

	Shares		Weighted- Average Grant-Date Fair Value
	(shares in thousands)
Nonvested restricted stock at December 31, 2017	1,653		$	171.68
Granted	576		276.62
Vested	(1,045	)	185.82
Forfeited	(220	)	180.83
Nonvested restricted stock at December 31, 2018	964		$	213.99

Approximately 12% of the nonvested restricted stock at December 31, 2018 included performance-based conditions.

The fair value of shares vested was $298 million during 2018, $306 million during 2017, and $253 million during 2016. Total compensation expense not yet recognized related to nonvested restricted stock was $156 million at December 31, 2018. We expect to recognize this compensation expense over a weighted-average period of approximately 1.8 years. There are no other contractual terms covering restricted stock once vested.

Stock Options

Stock options are granted with an exercise price equal to the fair market value of the underlying common stock on the date of grant. Our stock plans, as approved by the Board of Directors and stockholders, define fair market value as the average of the highest and lowest stock prices reported on the composite tape by the New York Stock Exchange on a given date. Exercise provisions vary, but most options vest in whole or in part 1 to 3 years after grant and expire 7 years after grant.

The weighted-average fair value of each option granted during 2018, 2017, and 2016 is provided below. The fair value was estimated on the date of grant using the Black-Scholes pricing model with the weighted-average assumptions indicated below:

	2018			2017			2016
Weighted-average fair value at grant date	$	63.67		$	49.81		$	37.12
Expected option life (years)	4.1 years			4.1 years			4.2 years
Expected volatility	26.1		%	27.1		%	27.6		%
Risk-free interest rate at grant date	2.5		%	2.0		%	1.1		%
Dividend yield	0.7		%	0.7		%	0.7		%

When valuing employee stock options, we stratify the employee population into three homogeneous groups that historically have exhibited similar exercise behaviors. These groups are executive officers, directors, and all other employees. We value the stock options based on the unique assumptions for each of these employee groups.

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We calculate the expected term for our employee stock options based on historical employee exercise behavior and base the risk-free interest rate on a traded zero-coupon U.S. Treasury bond with a term substantially equal to the option’s expected term.

The volatility used to value employee stock options is based on historical volatility. We calculate historical volatility using a simple-average calculation methodology based on daily price intervals as measured over the expected term of the option.

Activity for our option plans was as follows for the year ended December 31, 2018:

	Shares  Under Option		Weighted-Average Exercise Price
	(shares in thousands)
Options outstanding at December 31, 2017	863		$	181.44
Granted	143		276.01
Exercised	(320	)	157.44
Forfeited	(9	)	150.59
Options outstanding at December 31, 2018	677		$	213.17
Options exercisable at December 31, 2018	178		$	180.76

As of December 31, 2018, outstanding stock options, substantially all of which are expected to vest, had an aggregate intrinsic value of $48 million, and a weighted-average remaining contractual term of 5 years. As of December 31, 2018, exercisable stock options had an aggregate intrinsic value of $19 million, and a weighted-average remaining contractual term of 4.1 years. The total intrinsic value of stock options exercised during 2018 was $43 million, compared with $44 million during 2017 and $18 million during 2016. Cash received from stock option exercises totaled $50 million in 2018, $63 million in 2017, and $14 million in 2016.

Total compensation expense not yet recognized related to nonvested options was $14 million at December 31, 2018. We expect to recognize this compensation expense over a weighted-average period of approximately 1.7 years.

14. EARNINGS PER COMMON SHARE COMPUTATION

Detail supporting the computation of basic and diluted earnings per common share was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018		2017		2016
	(dollars in millions, except per common share results, number of shares/options in thousands)
Net income available for common stockholders	$	1,683	$	2,448	$	614
Weighted-average outstanding shares of common stock used to compute basic earnings per common share	137,486		144,493		149,375
Dilutive effect of:
Employee stock options	194		172		219
Restricted stock	723		920		1,323
Shares used to compute diluted earnings per common share	138,403		145,585		150,917
Basic earnings per common share	$	12.24	$	16.94	$	4.11
Diluted earnings per common share	$	12.16	$	16.81	$	4.07
Number of antidilutive stock options and restricted stock awards excluded from computation	223		539		748

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15. STOCKHOLDERS’ EQUITY

Dividends

The following table provides details of dividend payments, excluding dividend equivalent rights, in 2016, 2017, and 2018 under our Board approved quarterly cash dividend policy:

Payment Date	Amount per Share	Total Amount
		(in millions)
2016	$1.16	$172
2017	$1.49	$216
2018	$1.90	$262

On November 2, 2018, the Board declared a cash dividend of $0.50 per share that was paid on January 25, 2019 to stockholders of record on December 31, 2018, for an aggregate amount of $68 million. Declaration and payment of future quarterly dividends is at the discretion of our Board and may be adjusted as business needs or market conditions change.

In February 2019, the Board declared a cash dividend of$0.55 per share payable on April 26, 2019 to stockholders of record on March 29, 2019.

Stock Repurchases

Our Board of Directors may authorize the purchase of our common shares. Under our share repurchase authorization, shares may have been purchased from time to time at prevailing prices in the open market, by block purchases, through plans designed to comply with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, or in privately-negotiated transactions (including pursuant to accelerated share repurchase agreements with investment banks), subject to certain regulatory restrictions on volume, pricing, and timing.

On February 14, 2017, our Board of Directors authorized the repurchase of up to $2.25 billion of our common shares expiring on December 31, 2017, exclusive of shares repurchased in connection with employee stock plans.

On February 16, 2017, we entered into an accelerated share repurchase agreement, the February 2017 ASR, with Goldman, Sachs & Co. LLC, or Goldman Sachs, to repurchase $1.5 billion of our common stock as part of the $2.25 billion share repurchase authorized on February 14, 2017. On February 22, 2017, we made a payment of $1.5 billion to Goldman Sachs from available cash on hand and received an initial delivery of 5.83 million shares of our common stock from Goldman Sachs based on the then current market price of Humana common stock. The payment to Goldman Sachs was recorded as a reduction to stockholders’ equity, consisting of a $1.2 billion increase in treasury stock, which reflected the value of the initial 5.83 million shares received upon initial settlement, and a $300 million decrease in capital in excess of par value, which reflected the value of stock held back by Goldman Sachs pending final settlement of the February 2017 ASR. Upon settlement of the February 2017 ASR on August 28, 2017, we received an additional 0.84 million shares as determined by the average daily volume weighted-average share price of our common stock during the term of the agreement of $224.81, less a discount and subject to adjustments pursuant to the terms and conditions of the February 2017 ASR, bringing the total shares received under this program to 6.67 million. In addition, upon settlement we reclassified the $300 million value of stock initially held back by Goldman Sachs from capital in excess of par value to treasury stock. Subsequent to settlement of the February 2017 ASR, we repurchased an additional 3.04 million shares in the open market, utilizing the remaining $750 million of the $2.25 billion authorization prior to expiration.

On December 14, 2017, our Board of Directors authorized the repurchase of up to $3.0 billion of our common shares expiring on December 31, 2020, exclusive of shares repurchased in connection with employee stock plans.

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On December 21, 2017, we entered into an accelerated stock repurchase agreement, the December 2017 ASR, with Bank of America, N.A., or BofA, to repurchase $1.0 billion of our common stock as part of the $3.0 billion share repurchase program authorized on December 14, 2017. On December 22, 2017, we made a payment of $1.0 billion to BofA from available cash on hand and received an initial delivery of 3.28 million shares of our common stock from BofA based on the then current market price of Humana common stock. The payment to BofA was recorded as a reduction to stockholders’ equity, consisting of an $800 million increase in treasury stock, which reflected the value of the initial 3.28 million shares received upon initial settlement, and a $200 million decrease in capital in excess of par value, which reflected the value of stock held back by BofA pending final settlement of the December 2017 ASR. Upon settlement of the ASR on March 26, 2018, we received an additional 0.46 million shares as determined by the average daily volume weighted-average share price of our common stock during the term of the ASR Agreement of $267.55, bringing the total shares received under this program to 3.74 million. In addition, upon settlement we reclassified the $200 million value of stock initially held back by BofA from capital in excess of par value to treasury stock.

On November 28, 2018, we entered into an accelerated stock repurchase agreement, the November 2018 ASR, with Goldman Sachs to repurchase $750 millionof our common stock as part of the$3.0 billionshare repurchase program authorized by the Board of Directors on December 14, 2017. On November 29, 2018, we made a payment of $750 million to Goldman Sachs from available cash on hand and received an initial delivery of 1.94 million shares of our common stock from Goldman Sachs. The payment to Goldman Sachs was recorded as a reduction to stockholders’ equity, consisting of a $600 million increase in treasury stock, which reflects the value of the initial 1.94 million shares received upon initial settlement, and a $150 million decrease in capital in excess of par value, which reflected the value of stock held back by Goldman Sachs pending final settlement of the November 2018 ASR. The final number of shares that we may receive, or be required to remit, under the agreement will be determined based on the daily volume-weighted average share price of our common stock over the term of the agreement, less a discount and subject to adjustments pursuant to the terms and conditions of the agreement. Final settlement under the November 2018 ASR is expected to occur by the end of the first quarter of 2019. The agreement contains provisions customary for agreements of this type, including provisions for adjustments to the transaction terms upon certain specified events, the circumstances generally under which final settlement may be accelerated or extended or the agreement may be terminated early by Goldman Sachs or Humana, and various acknowledgments and representations made by the parties to each other. At final settlement, under certain circumstances, we may be entitled to receive additional shares of our common stock from Goldman Sachs or we may be required to make a payment. If we are obligated to make payment, we may elect to satisfy such obligation in cash or shares of our common stock.

Our remaining repurchase authorization was approximately $1,176 million as of February 21, 2019, excluding the $150 million pending final settlement of our November 28, 2018 ASR.

Excluding shares acquired in connection with employee stock plans, share repurchases were as follows during the years ended December 31, 2018, 2017 and 2016.

		2018			2017			2016
Authorization Date	Purchase Not to Exceed	Shares	Cost		Shares	Cost		Shares	Cost
	(in millions)
February 2017	2,250	—	—		9.71	2,250		—	—
December 2017	3,000	3.07	1,024		3.28	800		—	—
Total repurchases		3.07	$	1,024	12.99	$	3,050	—	$	—

In connection with employee stock plans, we acquired 0.4 million common shares for $116 million in 2018, 0.5 million common shares for $115 million in 2017, and 0.6 million common shares for $104 million in 2016.

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Regulatory Requirements

Certain of our subsidiaries operate in states that regulate the payment of dividends, loans, or other cash transfers to Humana Inc., our parent company, and require minimum levels of equity as well as limit investments to approved securities. The amount of dividends that may be paid to Humana Inc. by these subsidiaries, without prior approval by state regulatory authorities, or ordinary dividends, is limited based on the entity’s level of statutory income and statutory capital and surplus. If the dividend, together with other dividends paid within the preceding twelve months, exceeds a specified statutory limit or is paid from sources other than earned surplus, it is generally considered an extraordinary dividend requiring prior regulatory approval. In most states, prior notification is provided before paying a dividend even if approval is not required.

Although minimum required levels of equity are largely based on premium volume, product mix, and the quality of assets held, minimum requirements vary significantly at the state level. Our state regulated insurances subsidiaries had aggregate statutory capital and surplus of approximately$7.6 billion and $8.0 billion as of December 31, 2018 and 2017, respectively, which exceeded aggregate minimum regulatory requirements of$5.2 billion and $4.8 billion, respectively. The amount of ordinary dividends that may be paid to our parent company in2019is approximately$1 billionin the aggregate. The amount, timing and mix of ordinary and extraordinary dividend payments will vary due to state regulatory requirements, the level of excess statutory capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix. Actual dividends that were paid to our parent company were approximately$2.3 billion in 2018, $1.4 billion in 2017, and $0.8 billion in 2016.

16. COMMITMENTS, GUARANTEES AND CONTINGENCIES

Leases

We lease facilities, computer hardware, and other furniture and equipment under long-term operating leases that are noncancelable and expire on various dates through 2046. We sublease facilities or partial facilities to third party tenants for space not used in our operations. Rent with scheduled escalation terms are accounted for on a straight-line basis over the lease term. Rent expense and sublease rental income, which are recorded net as an operating cost, for all operating leases were as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Rent expense	$	167		$	204		$	179
Sublease rental income	(32		)	(33		)	(26		)
Net rent expense	$	135		$	171		$	153

Future annual minimum payments due subsequent to December 31, 2018 under all of our noncancelable operating leases with initial terms in excess of one year are as follows:

	Minimum Lease Payments		Sublease Rental Receipts			Net  Lease Commitments
	(in millions)
For the years ending December 31,:
2019	$	147	$	(13	)	$	134
2020	113		(12		)	101
2021	96		(10		)	86
2022	79		(9		)	70
2023	34		(9		)	25
Thereafter	50		(23		)	27
Total	$	519	$	(76	)	$	443

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Purchase Obligations

We have agreements to purchase services, primarily information technology related services, or to make improvements to real estate, in each case that are enforceable and legally binding on us and that specify all significant terms, including: fixed or minimum levels of service to be purchased; fixed, minimum or variable price provisions; and the appropriate timing of the transaction. We have purchase obligation commitments of $240 million in 2019, $201 million in 2020, $136 million in 2021, $98 million in 2022, and $61 million in 2023. Purchase obligations exclude agreements that are cancelable without penalty.

Off-Balance Sheet Arrangements

As part of our ongoing business, we do not participate or knowingly seek to participate in transactions that generate relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, or SPEs, which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. As of December 31, 2018, we were not involved in any SPE transactions.

Guarantees and Indemnifications

Through indemnity agreements approved by the state regulatory authorities, certain of our regulated subsidiaries generally are guaranteed by Humana Inc., our parent company, in the event of insolvency for (1) member coverage for which premium payment has been made prior to insolvency; (2) benefits for members then hospitalized until discharged; and (3) payment to providers for services rendered prior to insolvency. Our parent also has guaranteed the obligations of our military services subsidiaries and funding to maintain required statutory capital levels of certain regulated subsidiaries.

In the ordinary course of business, we enter into contractual arrangements under which we may agree to indemnify a third party to such arrangement from any losses incurred relating to the services they perform on behalf of us, or for losses arising from certain events as defined within the particular contract, which may include, for example, litigation or claims relating to past performance. Such indemnification obligations may not be subject to maximum loss clauses. Historically, payments made related to these indemnifications have been immaterial.

Government Contracts

Our Medicare products, which accounted for approximately 80% of our total premiums and services revenue for the year ended December 31, 2018, primarily consisted of products covered under the Medicare Advantage and Medicare Part D Prescription Drug Plan contracts with the federal government. These contracts are renewed generally for a calendar year term unless CMS notifies us of its decision not to renew by May 1 of the calendar year in which the contract would end, or we notify CMS of our decision not to renew by the first Monday in June of the calendar year in which the contract would end. All material contracts between Humana and CMS relating to our Medicare products have been renewed for 2019, and all of our product offerings filed with CMS for 2019 have been approved.

CMS uses a risk-adjustment model which adjusts premiums paid to Medicare Advantage, or MA, plans according to health status of covered members. The risk-adjustment model, which CMS implemented pursuant to the Balanced Budget Act of 1997 (BBA) and the Benefits Improvement and Protection Act of 2000 (BIPA), generally pays more where a plan's membership has higher expected costs. Under this model, rates paid to MA plans are based on actuarially determined bids, which include a process whereby our prospective payments are based on our estimated cost of providing standard Medicare-covered benefits to an enrollee with a "national average risk profile." That baseline payment amount is adjusted to reflect the health status of our enrolled membership. Under the risk-adjustment methodology, all MA plans must collect and submit the necessary diagnosis code information from hospital inpatient, hospital outpatient, and physician providers to CMS within prescribed deadlines. The CMS risk-adjustment model uses the diagnosis data to calculate the risk-adjusted premium payment to MA plans, which CMS adjusts for coding pattern differences between the health plans and the government fee-for-service program. We generally rely on providers, including certain providers in our network who are our employees, to code their claim submissions with appropriate diagnoses, which we send to CMS as the basis for our payment received from CMS under the actuarial risk-adjustment model. We also rely on these

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providers to document appropriately all medical data, including the diagnosis data submitted with claims. In addition, we conduct medical record reviews as part of our data and payment accuracy compliance efforts, to more accurately reflect diagnosis conditions under the risk adjustment model. These compliance efforts include the internal contract level audits described in more detail below, as well as ordinary course reviews of our internal business processes.

CMS is phasing-in the process of calculating risk scores using diagnoses data from the Risk Adjustment Processing System, or RAPS, to diagnoses data from the Encounter Data System, or EDS. The RAPS process requires MA plans to apply a filter logic based on CMS guidelines and only submit diagnoses that satisfy those guidelines. For submissions through EDS, CMS requires MA plans to submit all the encounter data and CMS will apply the risk adjustment filtering logic to determine the risk scores. For 2018, 15% of the risk score was calculated from claims data submitted through EDS. In 2019 and 2020 CMS will increase that percentage to 25% and 50%, respectively.The phase-in from RAPS to EDS could result in different risk scores from each dataset as a result of plan processing issues, CMS processing issues, or filtering logic differences between RAPS and EDS, and could have a material adverse effect on our results of operations, financial position, or cash flows.

CMS and the Office of the Inspector General of Health and Human Services, or HHS-OIG, are continuing to perform audits of various companies’ selected MA contracts related to this risk adjustment diagnosis data. We refer to these audits as Risk-Adjustment Data Validation Audits, or RADV audits. RADV audits review medical records in an attempt to validate provider medical record documentation and coding practices which influence the calculation of premium payments to MA plans.

In 2012, CMS released a “Notice of Final Payment Error Calculation Methodology for Part C Medicare Advantage Risk Adjustment Data Validation (RADV) Contract-Level Audits.” The payment error calculation methodology provided that, in calculating the economic impact of audit results for an MA contract, if any, the results of the RADV audit sample would be extrapolated to the entire MA contract after a comparison of the audit results to a similar audit of Medicare FFS (we refer to the process of accounting for errors in FFS claims as the "FFS Adjuster"). This comparison of RADV audit results to the FFS error rate is necessary to determine the economic impact, if any, of RADV audit results because the government used the Medicare FFS program data set, including any attendant errors that are present in that data set, to estimate the costs of various health status conditions and to set the resulting adjustments to MA plans’ payment rates in order to establish actuarial equivalence in payment rates as required under the Medicare statute. CMS already makes other adjustments to payment rates based on a comparison of coding pattern differences between MA plans and Medicare FFS data (such as for frequency of coding for certain diagnoses in MA plan data versus the Medicare FFS program dataset).

The final RADV extrapolation methodology, including the first application of extrapolated audit results to determine audit settlements, is expected to be applied to CMS RADV contract level audits conducted for contract year 2011 and subsequent years. CMS is currently conducting RADV contract level audits for certain of our Medicare Advantage plans.

Estimated audit settlements are recorded as a reduction of premiums revenue in our consolidated statements of income, based upon available information. We perform internal contract level audits based on the RADV audit methodology prescribed by CMS. Included in these internal contract level audits is an audit of our Private Fee-For Service business which we used to represent a proxy of the FFS Adjuster which has not yet been finalized. We based our accrual of estimated audit settlements for each contract year on the results of these internal contract level audits and update our estimates as each audit is completed. Estimates derived from these results were not material to our results of operations, financial position, or cash flows. We report the results of these internal contract level audits to CMS, including identified overpayments, if any.

On October 26, 2018, CMS issued a proposed rule and accompanying materials (which we refer to as the “Proposed Rule”) related to, among other things, the RADV audit methodology described above. If implemented, the Proposed Rule would use extrapolation in RADV audits applicable to payment year 2011 contract-level audits and all subsequent audits, without the application of a FFS Adjuster to audit findings. We are studying the Proposed Rule and CMS’ underlying analysis contained therein. We believe, however, that the Proposed Rule fails to address adequately the statutory requirement of actuarial equivalence, and we expect to provide substantive comments to CMS on the Proposed

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Rule as part of the notice-and-comment rulemaking process. We are also evaluating the potential impact of the Proposed Rule, and any related regulatory, industry or company reactions, all or any of which could have a material adverse effect on our results of operations, financial position, or cash flows.

In addition, as part of our internal compliance efforts, we routinely perform ordinary course reviews of our internal business processes related to, among other things, our risk coding and data submissions in connection with the risk- adjustment model. These reviews may also result in the identification of errors and the submission of corrections to CMS, that may, either individually or in the aggregate, be material. As such, the result of these reviews may have a material adverse effect on our results of operations, financial position, or cash flows.

We believe that CMS' statements and policies regarding the requirement to report and return identified overpayments received by MA plans are inconsistent with CMS' 2012 RADV audit methodology, and the Medicare statute's requirements. These statements and policies, such as certain statements contained in the preamble to CMS’ final rule release regarding Medicare Advantage and Part D prescription drug benefit program regulations for Contract Year 2015 (which we refer to as the "Overpayment Rule"), and the Proposed Rule, appear to equate each Medicare Advantage risk adjustment data error with an “overpayment” without addressing the principles underlying the FFS Adjuster referenced above. On September 7, 2018, the Federal District Court for the District of Columbia vacated CMS's Overpayment Rule, concluding that it violated the Medicare statute, including the requirement for actuarial equivalence, and that the Overpayment Rule was also arbitrary and capricious in departing from CMS's RADV methodology without adequate explanation (among other reasons). CMS has filed a motion for reconsideration related to certain aspects of the Federal District Court's opinion and has simultaneously filed a notice to appeal the decision to the Circuit Court of Appeals.

We will continue to work with CMS to ensure that MA plans are paid accurately and that payment model principles are in accordance with the requirements of the Social Security Act, which, if not implemented correctly could have a material adverse effect on our results of operations, financial position, or cash flows.

At December 31, 2018, our military services business, which accounted for approximately 1% of our total premiums and services revenue for the year ended December 31, 2018, primarily consisted of the TRICARE T2017 East Region contract replacing the 5-year T3 South Region contract that expired on December 31, 2017. The T2017 East Region contract is a consolidation of the former T3 North and South Regions, comprising thirty-two states and approximately 6 million TRICARE beneficiaries, under which delivery of health care services commenced on January 1, 2018. The T2017 East Region contract is a 5-year contract set to expire on December 31, 2022 and is subject to renewals on January 1 of each year during its term at the government's option.

Our state-based Medicaid business accounted for approximately 4% of our total premiums and services revenue for the year ended December 31, 2018. In addition to our state-based Temporary Assistance for Needy Families, or TANF, Medicaid contracts in Florida and Kentucky, we have contracts in Florida for Long Term Support Services (LTSS), and in Illinois for stand-alone dual eligible demonstration programs serving individuals dually eligible for both the federal Medicare program and the applicable state-based Medicaid program.

The loss of any of the contracts above or significant changes in these programs as a result of legislative or regulatory action, including reductions in premium payments to us, regulatory restrictions on profitability, including reviews by regulatory bodies that may compare our Medicare Advantage profitability to our non-Medicare Advantage business profitability, or compare the profitability of various products within our Medicare Advantage business, and require that they remain within certain ranges of each other, or increases in member benefits without corresponding increases in premium payments to us, may have a material adverse effect on our results of operations, financial position, and cash flows.

Legal Proceedings and Certain Regulatory Matters

As previously disclosed, the Civil Division of the United States Department of Justice provided us with an information request in December 2014, concerning our Medicare Part C risk adjustment practices. The request relates to our oversight and submission of risk adjustment data generated by providers in our Medicare Advantage network, as well as to our business and compliance practices related to risk adjustment data generated by our providers and by

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us, including medical record reviews conducted as part of our data and payment accuracy compliance efforts, the use of health and well-being assessments, and our fraud detection efforts. We believe that this request for information is in connection with a wider review of Medicare Risk Adjustment generally that includes a number of Medicare Advantage plans, providers and vendors. We continue to cooperate with and voluntarily respond to the information requests from the Department of Justice. These matters are expected to result in additional qui tam litigation.

As previously disclosed, on January 19, 2016, an individual filed a qui tam suit captioned United States of America ex rel. Steven Scott v. Humana, Inc., in United States District Court, Central District of California, Western Division. The complaint alleges certain civil violations by us in connection with the actuarial equivalence of the plan benefits under Humana’s Basic PDP plan, a prescription drug plan offered by us under Medicare Part D. The action seeks damages and penalties on behalf of the United States under the False Claims Act. The court ordered the qui tam action unsealed on September 13, 2017, so that the relator could proceed, following notice from the U.S. Government that it was not intervening at that time. On January 29, 2018, the suit was transferred to the United States District Court, Western District of Kentucky, Louisville Division. We take seriously our obligations to comply with applicable CMS requirements and actuarial standards of practice, and continue to vigorously defend against these allegations since the transfer to the Western District of Kentucky. We have engaged in active discovery with the relator who has pursed the matter on behalf of the United States for the past year, and expect that discovery process to conclude in the near future and for the Court to consider our motion for summary judgment.

On November 2, 2017, we filed suit against the United States of America in the United States Court of Federal Claims, on behalf of our health plans seeking recovery from the federal government of approximately$611 million in payments under the risk corridor premium stabilization program established under Health Care Reform , for years 2014, 2015 and 2016. Our case has been stayed by the Court, pending resolution of similar cases filed by other insurers. We have not recognized revenue, nor have we recorded a receivable, for any amount due from the federal government for unpaid risk corridor payments as of December 31, 2018. We have fully recognized all liabilities due to the federal government that we have incurred under the risk corridor program, and have paid all amounts due to the federal government as required. There is no assurance that we will prevail in the lawsuit.

Other Lawsuits and Regulatory Matters

Our current and past business practices are subject to review or other investigations by various state insurance and health care regulatory authorities and other state and federal regulatory authorities. These authorities regularly scrutinize the business practices of health insurance, health care delivery and benefits companies. These reviews focus on numerous facets of our business, including claims payment practices, statutory capital requirements, provider contracting, risk adjustment, competitive practices, commission payments, privacy issues, utilization management practices, pharmacy benefits, access to care, and sales practices, among others. Some of these reviews have historically resulted in fines imposed on us and some have required changes to some of our practices. We continue to be subject to these reviews, which could result in additional fines or other sanctions being imposed on us or additional changes in some of our practices.

We also are involved in various other lawsuits that arise, for the most part, in the ordinary course of our business

operations, certain of which may be styled as class-action lawsuits. Among other matters, this litigation may include employment matters, claims of medical malpractice, bad faith, nonacceptance or termination of providers, anticompetitive practices, improper rate setting, provider contract rate and payment disputes, including disputes over reimbursement rates required by statute, general contractual matters, intellectual property matters, and challenges to subrogation practices. Under state guaranty assessment laws, including those related to state cooperative failures in the industry, we may be assessed (up to prescribed limits) for certain obligations to the policyholders and claimants of insolvent insurance companies that write the same line or lines of business as we do.

As a government contractor, we may also be subject to qui tam litigation brought by individuals who seek to sue on behalf of the government, alleging that the government contractor submitted false claims to the government including, among other allegations, those resulting from coding and review practices under the Medicare risk adjustment model. Qui tam litigation is filed under seal to allow the government an opportunity to investigate and to decide if it wishes to intervene and assume control of the litigation. If the government does not intervene, the individual may continue to

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prosecute the action on his or her own, on behalf of the government. We also are subject to other allegations of non-performance of contractual obligations to providers, members, and others, including failure to properly pay claims, improper policy terminations, challenges to our implementation of the Medicare Part D prescription drug program and other litigation.

A limited number of the claims asserted against us are subject to insurance coverage. Personal injury claims, claims for extra contractual damages, care delivery malpractice, and claims arising from medical benefit denials are covered by insurance from our wholly owned captive insurance subsidiary and excess carriers, except to the extent that claimants seek punitive damages, which may not be covered by insurance in certain states in which insurance coverage for punitive damages is not permitted. In addition, insurance coverage for all or certain forms of liability has become increasingly costly and may become unavailable or prohibitively expensive in the future.

We record accruals for the contingencies discussed in the sections above to the extent that we conclude it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. No estimate of the possible loss or range of loss in excess of amounts accrued, if any, can be made at this time regarding the matters specifically described above because of the inherently unpredictable nature of legal proceedings, which also may be exacerbated by various factors, including: (i) the damages sought in the proceedings are unsubstantiated or indeterminate; (ii) discovery is not complete; (iii) the proceeding is in its early stages; (iv) the matters present legal uncertainties; (v) there are significant facts in dispute; (vi) there are a large number of parties (including where it is uncertain how liability, if any, will be shared among multiple defendants); or (vii) there is a wide range of potential outcomes.

The outcome of any current or future litigation or governmental or internal investigations, including the matters described above, cannot be accurately predicted, nor can we predict any resulting judgments, penalties, fines or other sanctions that may be imposed at the discretion of federal or state regulatory authorities or as a result of actions by third parties. Nevertheless, it is reasonably possible that any such outcome of litigation, judgments, penalties, fines or other sanctions could be substantial, and the outcome of these matters may have a material adverse effect on our results of operations, financial position, and cash flows, and may also affect our reputation.

17. SEGMENT INFORMATION

We manage our business with four reportable segments: Retail, Group and Specialty, Healthcare Services, and Individual Commercial. In addition, the Other Businesses category includes businesses that are not individually reportable because they do not meet the quantitative thresholds required by generally accepted accounting principles. These segments are based on a combination of the type of health plan customer and adjacent businesses centered on well-being solutions for our health plans and other customers, as described below. These segment groupings are consistent with information used by our Chief Executive Officer to assess performance and allocate resources.

The Retail segment consists of Medicare benefits, marketed to individuals or directly via group Medicare accounts. In addition, the Retail segment also includes our contract with CMS to administer the Limited Income Newly Eligible Transition, or LI-NET, prescription drug plan program and contracts with various states to provide Medicaid, dual eligible, and Long-Term Support Services benefits, which we refer to collectively as our state-based contracts. The Group and Specialty segment consists of employer group commercial fully-insured medical and specialty health insurance benefits marketed to individuals and employer groups, including dental, vision, and other supplemental health benefits, as well as administrative services only, or ASO products. In addition, our Group and Specialty segment includes military services business, primarily our TRICARE T2017 East Region contract. The Healthcare Services segment includes our services offered to our health plan members as well as to third parties, including pharmacy solutions, provider services, and clinical care service, such as home health and other services and capabilities to promote wellness and advance population health, including our investment in Kindred at Home. The Individual Commercial segment consisted of our individual commercial fully-insured medical health insurance business, which we exited beginning January 1, 2018. We report under the category of Other Businesses those businesses that do not align with the reportable segments described above, primarily our closed-block long-term care insurance policies, which were sold in 2018.

Our Healthcare Services intersegment revenues primarily relate to managing prescription drug coverage for members of our other segments through Humana Pharmacy Solutions®, or HPS, and includes the operations of Humana

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Pharmacy, Inc., our mail order pharmacy business. These revenues consist of the prescription price (ingredient cost plus dispensing fee), including the portion to be settled with the member (co-share) or with the government (subsidies), plus any associated administrative fees. Services revenues related to the distribution of prescriptions by third party retail pharmacies in our networks are recognized when the claim is processed and product revenues from dispensing prescriptions from our mail order pharmacies are recorded when the prescription or product is shipped. Our pharmacy operations, which are responsible for designing pharmacy benefits, including defining member co-share responsibilities, determining formulary listings, contracting with retail pharmacies, confirming member eligibility, reviewing drug utilization, and processing claims, act as a principal in the arrangement on behalf of members in our other segments. As principal, our Healthcare Services segment reports revenues on a gross basis, including co-share amounts from members collected by third party retail pharmacies at the point of service.

In addition, our Healthcare Services intersegment revenues include revenues earned by certain owned providers derived from risk-based and non-risk-based managed care agreements with our health plans. Under risk based agreements, the provider receives a monthly capitated fee that varies depending on the demographics and health status of the member, for each member assigned to these owned providers by our health plans. The owned provider assumes the economic risk of funding the assigned members’ healthcare services. Under non risk-based agreements, our health plans retain the economic risk of funding the assigned members' healthcare services. Our Healthcare Services segment reports provider services revenues associated with risk-based agreements on a gross basis, whereby capitation fee revenue is recognized in the period in which the assigned members are entitled to receive healthcare services. Provider services revenues associated with non-risk-based agreements are presented net of associated healthcare costs.

We present our consolidated results of operations from the perspective of the health plans. As a result, the cost of providing benefits to our members, whether provided via a third party provider or internally through a stand-alone subsidiary, is classified as benefits expense and excludes the portion of the cost for which the health plans do not bear responsibility, including member co-share amounts and government subsidies of $13.4 billion in 2018, $13.5 billion in 2017, and $13.4 billion in 2016. In addition, depreciation and amortization expense associated with certain businesses in our Healthcare Services segment delivering benefits to our members, primarily associated with our provider services and pharmacy operations, are included with benefits expense. The amount of this expense was $129 million in 2018, $107 million in 2017, and $111 million in 2016.

Other than those described previously, the accounting policies of each segment are the same and are described in Note 2. Transactions between reportable segments primarily consist of sales of services rendered by our Healthcare Services segment, primarily pharmacy, provider, and clinical care services, to our Retail and Group and Specialty segment customers. Intersegment sales and expenses are recorded at fair value and eliminated in consolidation. Members served by our segments often use the same provider networks, enabling us in some instances to obtain more favorable contract terms with providers. Our segments also share indirect costs and assets. As a result, the profitability of each segment is interdependent. We allocate most operating expenses to our segments. Assets and certain corporate income and expenses are not allocated to the segments, including the portion of investment income not supporting segment operations, interest expense on corporate debt, and certain other corporate expenses. These items are managed at a corporate level. These corporate amounts are reported separately from our reportable segments and are included with intersegment eliminations in the tables presenting segment results below.

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	Retail		Group and Specialty		Healthcare Services		Individual Commercial			Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
2018
External revenues
Premiums:
Individual Medicare Advantage	$	35,656	$	—	$	—	$	—		$	—	$	—		$	35,656
Group Medicare Advantage	6,103		—		—		—			—		—			6,103
Medicare stand-alone PDP	3,584		—		—		—			—		—			3,584
Total Medicare	45,343		—		—		—			—		—			45,343
Fully-insured	510		5,444		—		8			—		—			5,962
Specialty	—		1,359		—		—			—		—			1,359
Medicaid and other	2,255		—		—		—			22		—			2,277
Total premiums	48,108		6,803		—		8			22		—			54,941
Services revenue:
Provider	—		—		404		—			—		—			404
ASO and other	11		835		—		—			4		—			850
Pharmacy	—		—		203		—			—		—			203
Total services revenue	11		835		607		—			4		—			1,457
Total external revenues	48,119		7,638		607		8			26		—			56,398
Intersegment revenues
Services	—		18		16,840		—			—		(16,858		)	—
Products	—		—		6,330		—			—		(6,330		)	—
Total intersegment revenues	—		18		23,170		—			—		(23,188		)	—
Investment income	136		23		34		—			110		211			514
Total revenues	48,255		7,679		23,811		8			136		(22,977		)	56,912
Operating expenses:
Benefits	40,925		5,420		—		(70		)	77		(470		)	45,882
Operating costs	5,327		1,810		22,905		4			6		(22,527		)	7,525
Depreciation and amortization	270		88		163		—			—		(116		)	405
Total operating expenses	46,522		7,318		23,068		(66		)	83		(23,113		)	53,812
Income from operations	1,733		361		743		74			53		136			3,100
Loss on sale of business	—		—		—		—			—		786			786
Interest expense	—		—		—		—			—		218			218
Other expense, net	—		—		—		—			—		33			33
Income (loss) before income taxes and equity in earnings	1,733		361		743		74			53		(901		)	2,063
Equity in net earnings of Kindred at Home	—		—		11		—			—		—			11
Segment earnings (losses)	$	1,733	$	361	$	754	$	74		$	53	$	(901	)	$	2,074

Premium and services revenues derived from our contracts with the federal government, as a percentage of our total premium and services revenues, was approximately 81% for 2018, compared to 79% for 2017, and 75% for 2016.

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	Retail		Group and Specialty		Healthcare Services		Individual Commercial		Other Businesses			Eliminations/ Corporate			Consolidated
	(in millions)
2017
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	32,720	$	—	$	—	$	—	$	—		$	—		$	32,720
Group Medicare Advantage	5,155		—		—		—		—			—			5,155
Medicare stand-alone PDP	3,702		—		—		—		—			—			3,702
Total Medicare	41,577		—		—		—		—			—			41,577
Fully-insured	478		5,462		—		947		—			—			6,887
Specialty	—		1,310		—		—		—			—			1,310
Medicaid and other	2,571		—		—		—		35			—			2,606
Total premiums	44,626		6,772		—		947		35			—			52,380
Services revenue:
Provider	—		—		258		—		—			—			258
ASO and other	10		626		—		—		8			—			644
Pharmacy	—		—		80		—		—			—			80
Total services revenue	10		626		338		—		8			—			982
Total revenues—external customers	44,636		7,398		338		947		43			—			53,362
Intersegment revenues
Services	—		20		17,293		—		—			(17,313		)	—
Products	—		—		6,292		—		—			(6,292		)	—
Total intersegment revenues	—		20		23,585		—		—			(23,605		)	—
Investment income	90		31		35		4		87			158			405
Total revenues	44,726		7,449		23,958		951		130			(23,447		)	53,767
Operating expenses:
Benefits	38,218		5,363		—		544		131			(760		)	43,496
Operating costs	4,292		1,590		22,848		201		12			(22,376		)	6,567
Merger termination fee and related costs, net	—		—		—		—		—			(936		)	(936		)
Depreciation and amortization	238		84		143		13		—			(100		)	378
Total operating expenses	42,748		7,037		22,991		758		143			(24,172		)	49,505
Income (loss) from operations	1,978		412		967		193		(13		)	725			4,262
Interest expense	—		—		—		—		—			242			242
Income (loss) before income taxes and equity in earnings	1,978		412		967		193		(13		)	483			4,020
Equity in net earnings of Kindred at Home	—		—		—		—		—			—			—
Segment earnings (losses)	$	1,978	$	412	$	967	$	193	$	(13	)	$	483		$	4,020

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	Retail		Group and Specialty		Healthcare Services		Individual Commercial			Other Businesses			Eliminations/ Corporate			Consolidated
	(in millions)
2016
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	31,863	$	—	$	—	$	—		$	—		$	—		$	31,863
Group Medicare Advantage	4,283		—		—		—			—			—			4,283
Medicare stand-alone PDP	4,009		—		—		—			—			—			4,009
Total Medicare	40,155		—		—		—			—			—			40,155
Fully-insured	428		5,405		—		3,064			—			—			8,897
Specialty	—		1,279		—		—			—			—			1,279
Medicaid and other	2,640		12		—		—			38			—			2,690
Total premiums	43,223		6,696		—		3,064			38			—			53,021
Services revenue:
Provider	—		—		278		—			—			—			278
ASO and other	6		643		1		—			10			—			660
Pharmacy	—		—		31		—			—			—			31
Total services revenue	6		643		310		—			10			—			969
Total revenues—external customers	43,229		7,339		310		3,064			48			—			53,990
Intersegment revenues
Services	—		22		18,979		—			—			(19,001		)	—
Products	—		—		5,993		—			—			(5,993		)	—
Total intersegment revenues	—		22		24,972		—			—			(24,994		)	—
Investment income	90		25		30		5			66			173			389
Total revenues	43,319		7,386		25,312		3,069			114			(24,821		)	54,379
Operating expenses:
Benefits	36,783		5,233		—		3,301			617			(927		)	45,007
Operating costs	4,650		1,727		24,073		601			16			(23,894		)	7,173
Merger termination fee and related costs, net	—		—		—		—			—			104			104
Depreciation and amortization	196		82		143		36			1			(104		)	354
Total operating expenses	41,629		7,042		24,216		3,938			634			(24,821		)	52,638
Income (loss) from operations	1,690		344		1,096		(869		)	(520		)	—			1,741
Gain on sale of business	—		—		—		—			—			—			—
Interest expense	—		—		—		—			—			189			189
Income (loss) before income taxes and equity in earnings	1,690		344		1,096		(869		)	(520		)	(189		)	1,552
Equity in net earnings of Kindred at Home	—		—		—		—			—			—			—
Segment earnings (losses)	$	1,690	$	344	$	1,096	$	(869	)	$	(520	)	$	(189	)	$	1,552

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Premiums revenue for our Individual Commercial segment for 2016 includes a reduction of $583 million associated with the write-off of commercial risk corridor receivables.

Benefits expense for Other Businesses for 2016 includes $505 million for reserve strengthening associated with our closed block of long-term care insurance policies as discussed more fully in Note 18.

18. EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS

Premiums associated with our long-duration insurance products accounted for less than 1% of our consolidated premiums and services revenue for the year ended December 31, 2018 and 2017. We use long-duration accounting for life insurance, annuities, certain health and other supplemental products and, prior to its sale in 2018, long-term care policies sold to individuals because they are expected to remain in force for an extended period beyond one year and because premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. As a result, we defer policy acquisition costs, primarily consisting of commissions, and amortize them over the estimated life of the policies in proportion to premiums earned.

In addition, we establish reserves for future policy benefits in recognition of the fact that some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. At policy issuance, these reserves are recognized on a net level premium method based on premium rate increase, interest rate, mortality, morbidity, persistency (the percentage of policies remaining in-force), and maintenance expense assumptions. The assumptions used to determine the liability for future policy benefits are established and locked in at the time each contract is issued and only change if our expected future experience deteriorates to the point that the level of the liability, together with the present value of future gross premiums, are not adequate to provide for future expected policy benefits and maintenance costs (i.e. the loss recognition date). As discussed in Note 2, beginning in 2014, health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model because premiums received in the current year are intended to pay anticipated benefits in that year.

The table below presents deferred acquisition costs and future policy benefits payable associated with our long-duration insurance products for the years ended December 31, 2018 and 2017.

	2018					2017
	Deferred acquisition costs		Future policy benefits payable			Deferred acquisition costs		Future policy benefits payable
	(in millions)
Other long-term assets	$	36	$	—		$	103	$	—
Trade accounts payable and accrued expenses	—		—			—		(56		)
Long-term liabilities	—		(219		)	—		(2,923		)
Total asset (liability)	$	36	$	(219	)	$	103	$	(2,979	)

The decline in the balances of the deferred acquisition costs and future benefits payable reflects the sale of KMG on August 9, 2018. In addition, future policy benefits payable include amounts of $217 million at December 31, 2018 and $199 million at December 31, 2017 which are subject to 100% coinsurance agreements as more fully described in Note 19.

Benefit expense reflects no net increase in future policy benefit payable in 2018, a net reduction of $22 million in 2017 and a net increase of $439 million in 2016. The 2016 amount reflects the net change of $505 million associated with our closed block of long-term care insurance policies, which were sold in 2018 as discussed further below. Amortization of deferred acquisition costs included in operating costs was $48 million in 2018, $71 million in 2017, and $67 million in 2016.

All three years include the effect of the release of reserves and accelerating deferred acquisition amortization costs of existing previously underwritten individual commercial medical members transitioning to policies compliant with the Health Care Reform Law. Deferred acquisition costs included $3 million associated with our individual commercial

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

medical policies at December 31, 2017. Future policy benefits payable associated with our individual commercial medical policies were $19 million at December 31, 2017. There were no remaining balances at December 31, 2018. We have exited our individual commercial medical business effective January 1, 2018.

Future policy benefits payable included$2.3 billion at December 31, 2017associated with a non-strategic closed block of long-term care insurance policies acquired in connection with the 2007 acquisition of KMG. As described in Note 3, on August 9, 2018, we completed the sale of KMG. Future policy benefits payable included amounts charged to accumulated other comprehensive income for an additional liability that would exist on our closed-block of long-term care insurance policies if unrealized gains on the sale of the investments backing such products had been realized and the proceeds reinvested at then current yields. There was additional liability of $168 millionat December 31, 2017. Amounts charged to accumulated other comprehensive income are net of applicable deferred taxes.

Long-term care insurance policies provided nursing home and home health coverage for which premiums are collected many years in advance of benefits paid, if any. Therefore, our actual claims experience will emerge many years after assumptions have been established. The risk of a deviation of the actual premium rate increase, interest, morbidity, mortality, persistency, and maintenance expense assumptions from those assumed in our reserves were particularly significant to our closed block of long-term care insurance policies. We monitored the loss experience of these long-term care insurance policies and, when necessary, applied for premium rate increases through a regulatory filing and approval process in the jurisdictions in which such products were sold. To the extent premium rate increases, interest rates, and/or loss experience varied from our loss recognition date assumptions, material adjustments to reserves were required.

During 2016, we recorded a loss for a premium deficiency. The premium deficiency was based on current and anticipated experience that had deteriorated from our locked-in assumptions from the previous December 31, 2013 loss recognition date, particularly as they related to emerging experience indicating longer claims duration, a prolonged lower interest rate environment, and an increase in policyholder life expectancies. Based on this deterioration, we determined that our existing future policy benefits payable, together with the present value of future gross premiums, associated with our closed block of long-term care insurance policies were not adequate to provide for future policy benefits and maintenance costs under these policies; therefore we unlocked and modified our assumptions based on current expectations. Accordingly, during 2016 we recorded $505 million of additional benefits expense, with a corresponding increase in future policy benefits payable of $659 million partially offset by a related reinsurance recoverable of $154 million included in other long-term assets. During 2017, we performed loss recognition testing comparing our existing future policy benefits payable with the present value of future gross premiums associated with our closed block of long-term care insurance policies and determined that no premium deficiency existed at December 31, 2017.

19. REINSURANCE

Certain blocks of insurance assumed in acquisitions, primarily life, annuities in run-off status and, prior to its sale in 2018, long-term care, are subject to reinsurance where some or all of the underwriting risk related to these policies has been ceded to a third party. In addition, a large portion of our reinsurance takes the form of 100% coinsurance agreements where, in addition to all of the underwriting risk, all administrative responsibilities, including premium collections and claim payment, have also been ceded to a third party. We acquired these policies and related reinsurance agreements with the purchase of stock of companies in which the policies were originally written. We acquired these companies for business reasons unrelated to these particular policies, including the companies’ other products and licenses necessary to fulfill strategic plans.

A reinsurance agreement between two entities transfers the underwriting risk of policyholder liabilities to a reinsurer while the primary insurer retains the contractual relationship with the ultimate insured. As such, these reinsurance agreements do not completely relieve us of our potential liability to the ultimate insured. However, given the transfer of underwriting risk, our potential liability is limited to the credit exposure which exists should the reinsurer be unable to meet its obligations assumed under these reinsurance agreements.

Reinsurance recoverables represent the portion of future policy benefits payable and benefits payable that are covered by reinsurance. Amounts recoverable from reinsurers are estimated in a manner consistent with the methods

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

used to determine future policy benefits payable as detailed in Note 2. Reinsurance recoverables, included in other current and long-term assets, were $314 million at December 31, 2018 and $824 million at December 31, 2017. The decline in the balances reflects the sale of KMG on August 9, 2018. The percentage of these reinsurance recoverables resulting from 100% coinsurance agreements was approximately 99% at December 31, 2018 and approximately 33% at December 31, 2017. Premiums ceded were $976 million in 2018, $969 million in 2017 and $842 million in 2016. Benefits ceded were $980 million in 2018, $844 million in 2017, and $767 million in 2016. Ceded premium and benefits reflect the activity associated with ceding all risk under a Medicaid contract to a third party reinsurer.

We evaluate the financial condition of our reinsurers on a regular basis. Protective Life Insurance Company with $177 million in reinsurance recoverables is well-known and well-established with a AM Best rating of A+ (superior) at December 31, 2018 . The remaining reinsurance recoverables of $137 million are divided between 10 other reinsurers, with $110 million subject to funds withheld accounts or other financial guarantees supporting the repayment of these amounts.

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Report of Independent Registered Public Accounting Firm

To theBoard of Directors and Stockholders of Humana Inc.

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Humana Inc.and its subsidiaries(the “Company”) as of December 31, 2018and 2017,and the related consolidated statements of income, comprehensive income, stockholders’ equity and cash flowsfor each of the three years in the period ended December 31,2018, including the related notes and financial statement schedules listed in the index appearing under Item 15(a)(2) (collectively referred to as the “consolidated financial statements”).We also have audited the Company's internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework(2013)issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidatedfinancial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2018and 2017, and the results of itsoperations and itscash flows for each of the three years in the period ended December 31, 2018in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework(2013)issued by the COSO.

Basis for Opinions

The Company's management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in Management's Report on Internal Control Over Financial Reportingappearing under Item 9A. Our responsibility is to express opinions on the Company’s consolidatedfinancial statements and on the Company's internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidatedfinancial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidatedfinancial statements included performing procedures to assess the risks of material misstatement of the consolidatedfinancial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidatedfinancial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidatedfinancial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in

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accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP

Louisville, Kentucky

February 21, 2019

We have served as the Company’s auditor since 1968.

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Humana Inc.

QUARTERLY FINANCIAL INFORMATION

(Unaudited)

A summary of our quarterly unaudited results of operations for the years ended December 31, 2018 and 2017 follows:

	2018
	First		Second		Third		Fourth
	(in millions, except per share results)
Total revenues	$	14,279	$	14,259	$	14,206	$	14,168
Income before income taxes and equity in net earnings	707		19		901		436
Net income	491		193		644		355
Basic earnings per common share	$	3.56	$	1.40	$	4.68	$	2.60
Diluted earnings per common share (1)	$	3.53	$	1.39	$	4.65	$	2.58
	2017
	First		Second		Third		Fourth
	(in millions, except per share results)
Total revenues	$	13,762	$	13,534	$	13,282	$	13,189
Income before income taxes	1,689		1,042		799		490
Net income	1,115		650		499		184
Basic earnings per common share (1)	$	7.54	$	4.49	$	3.46	$	1.30
Diluted earnings per common share (1)	$	7.49	$	4.46	$	3.44	$	1.29

(1) The calculation of earnings per common share is based on the weighted average shares outstanding during each quarter and, accordingly, the sum may not equal the total for the year.

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ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

Not applicable.

ITEM 9A. CONTROLS AND PROCEDURES

Management’s Responsibility for Financial Statements and Other Information

We are responsible for the preparation and integrity of the consolidated financial statements appearing in our Annual Report. The consolidated financial statements were prepared in conformity with accounting principles generally accepted in the United States and include amounts based on our estimates and judgments. All other financial information in this report has been presented on a basis consistent with the information included in the financial statements.

Our control environment is the foundation for our system of internal control over financial reporting and is embodied in our Code of Ethics and Business Conduct, which we currently refer to as the Humana Inc. Ethics Every Day. It sets the tone of our organization and includes factors such as integrity and ethical values. Our internal control over financial reporting is supported by formal policies and procedures which are reviewed, modified and improved as changes occur in business conditions and operations.

The Audit Committee of the Board of Directors, which is composed solely of independent outside directors, meets periodically with members of management, the internal auditors and our independent registered public accounting firm to review and discuss internal controls over financial reporting and accounting and financial reporting matters. Our independent registered public accounting firm and internal auditors report to the Audit Committee and accordingly have full and free access to the Audit Committee at any time.

Evaluation of Disclosure Controls and Procedures

We have established disclosure controls and procedures to ensure that material information relating to the Company, including its consolidated subsidiaries, is made known to members of senior management and the Board of Directors.

Based on our evaluation as of December 31, 2018, we as the principal executive officer, the principal financial officer and the principal accounting officer of the Company have concluded that the Company’s disclosure controls and procedures (as defined in the Securities Exchange Act of 1934) are effective to ensure that the information required to be disclosed by the Company in the reports that it files or submits under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported as specified in Securities and Exchange Commission rules and forms.

Management’s Report on Internal Control Over Financial Reporting

We are responsible for establishing and maintaining effective internal control over financial reporting as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934. The Company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate or that the degree of compliance with the policies or procedures may deteriorate.

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We assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 2018. In making this assessment, we used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control – Integrated Framework (2013). Based on our assessment, we determined that, as of December 31, 2018, the Company’s internal control over financial reporting was effective based on those criteria.

The effectiveness of our internal control over financial reporting as of December 31, 2018 has been audited by PricewaterhouseCoopers LLP, our independent registered public accounting firm, who also audited the Company’s consolidated financial statements included in our Annual Report on Form 10-K, as stated in their report which appears on page 134.

Changes in Internal Control over Financial Reporting

There have been no changes in the Company’s internal control over financial reporting during the quarter ended December 31, 2018 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

ITEM 9B. OTHER INFORMATION

None.

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PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Directors

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 18, 2019 appearing under the caption “Proposal One: Election of Directors” in such Proxy Statement.

Executive Officers of the Registrant

Set forth below are names and ages of all of our current executive officers as of February 1, 2019, their positions, and the date first elected an officer:

Name	Age	Position	First Elected Officer
Bruce D. Broussard	56	President and Chief Executive Officer, Director	12/11	(1)
Vishal Agrawal, M.D.	44	Chief Strategy and Corporate Development Officer	12/18	(2)
Roy A. Beveridge, M.D.	61	Chief Medical Officer	06/13	(3)
Elizabeth D. Bierbower	60	Segment President	03/17	(4)
Jody L. Bilney	57	Chief Consumer Officer	04/13	(5)
Sam M. Deshpande	54	Chief Risk Officer	07/17	(6)
William K. Fleming, PharmD	51	Segment President, Healthcare Services	03/17	(7)
Christopher H. Hunter	50	Segment President, Group Business	01/14	(8)
Timothy S. Huval	52	Chief Human Resources Officer	12/12	(9)
Brian A. Kane	46	Chief Financial Officer	06/14	(10)
Brian P. LeClaire	58	Chief Information Officer	08/11	(11)
Joseph C. Ventura	42	Chief Legal Officer and Corporate Secretary	02/19	(12)
T. Alan Wheatley	51	Segment President, Retail	03/17	(13)
Cynthia H. Zipperle	56	Senior Vice President and Chief Accounting Officer	12/14	(14)

(1) Mr. Broussard currently serves as Director, President and Chief Executive Officer (Principal Executive Officer), having held these positions since January 1, 2013. Mr. Broussard was elected President upon joining the Company in December 2011 and served in that capacity through December 2012. Prior to joining the Company, Mr. Broussard was Chief Executive Officer of McKesson Specialty/US Oncology, Inc. US Oncology was purchased by McKesson in December 2010. At US Oncology, Mr. Broussard served in a number of senior executive roles, including Chief Financial Officer, Chief Executive Officer, and Chairman of the Board.

(2) Dr. Agrawal serves as Chief Strategy and Corporate Development Officer, having joined the company in December 2018.  Prior to joining the company, Dr. Agrawal was Senior Advisor for The Carlyle Group L.P., having held that position from October 2017 to December 2018.  Previously, Dr. Agrawal was President and Chief Growth Officer of Ciox Health, the largest health information exchange and release of information services

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organization in the U.S. from December of 2015 to October 2018.  Prior to joining Ciox Health, Dr. Agrawal served as President of Harris Healthcare Solutions from January 2013 to December 2015.

(3) Dr. Beveridge currently serves as Chief Medical Officer, having held this position since joining the Company in June 2013. Prior to joining the Company, Dr. Beveridge served as Chief Medical Officer for McKesson Specialty Health from December 2010 until June 2013. Prior to McKesson’s acquisition of US Oncology, Dr. Beveridge served as the Executive Vice President and Medical Director at US Oncology from September 2009 through December 2010.

(4) Ms. Bierbower currently serves as Segment President, having held this position since August 2018.  She is responsible for creating a new operating model and member experience that reduces friction in the system and helps members engage in and manage their health. Prior to that, she served as the Segment President, Group Business, and also previously led the Company’s Specialty Benefits area, including dental, vision, life, disability and workplace voluntary benefits.  Ms. Bierbower joined the Company in 2001.

(5) Ms. Bilney currently serves as Chief Consumer Officer, having held this position since joining the Company in April 2013. Prior to joining the Company, Ms. Bilney served as Executive Vice President and Chief Brand Officer for Bloomin’ Brands, Inc. from 2006 until April 2013.

(6) Mr. Deshpande currently serves as Chief Risk Officer, having held this position since joining the Company in July 2017. Before joining Humana, Mr. Deshpande spent 17 years at Capital One in key leadership positions, most recently as Business Chief Risk Officer for the U.S. and international card business. He previously served as the Business Chief Risk Officer and Head of Enterprise Services for the Financial Services Division, responsible for Business Risk, Data Science, Data Quality, Process Excellence and Project Management. He also led marketing and analysis for the Home Loans, Auto Finance, and Credit Card businesses, with responsibilities for business strategy, credit, product and marketing.

(7) Mr. Fleming currently serves as Segment President, Healthcare Services, where he is responsible for Humana’s clinical and pharmacy businesses that service all Humana segments, having held this position since March of 2017. Prior to that, he served as President of the Company’s pharmacy business. Mr. Fleming joined the Company in 1994.

(8) Mr. Hunter currently serves as Segment President, Group Business, having held this position since August 2018.  Prior to that, he served as Chief Strategy Officer from joining the company in January 2014 until August 2018.  Prior to joining the Company, Mr. Hunter served as President of Provider Markets at The TriZetto Group, Inc. from July 2012 until December 2013, and as Senior Vice President, Emerging Markets at BlueCross BlueShield of Tennessee from 2009 through July 2012. While at BlueCross BlueShield of Tennessee, Mr. Hunter was simultaneously President and Chief Executive Officer of Onlife Health, a national health and wellness subsidiary of BlueCross BlueShield of Tennessee.

(9) Mr. Huval currently serves as Chief Human Resources Officer, having been elected to this position in December 2012. Prior to joining the Company, Mr. Huval spent 10 years at Bank of America in multiple senior-level roles, including Human Resources executive and Chief Information Officer for Global Wealth & Investment Management, as well as Human Resources executive for both Global Treasury Services and Technology & Global Operations.

(10) Mr. Kane currently serves as Chief Financial Officer, having been elected to this position in June 2014. Prior to joining the Company, Mr. Kane spent nearly 17 years at Goldman, Sachs & Co. As a managing director, he was responsible for client relationships as well as for leading strategic and financing transactions for a number of companies in multiple industries.

(11) Mr. LeClaire currently serves as Chief Information Officer, having held this position since January 2014. Prior to that, he served as Senior Vice President and Chief Service and Information Officer from August 2011 to January 2014, and as Chief Technology Officer from 2002 to August 2011. Mr. LeClaire joined the Company in August 1999.

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(12) Mr. Ventura currently serves as Chief Legal Officer and Corporate Secretary. He joined the Company in January 2009 and since then has held various positions of increasing responsibility in the Company's Law Department, including most recently, Senior Vice President, Associate General Counsel & Corporate Secretary from July 2017 until February 2019.

(13) Mr. Wheatley currently serves as Segment President, Retail, having held this position since March 2017. During his 25-year career with the Company, Mr. Wheatley has served in a number of key leadership roles, including Vice President of Medicare Service Operations and President of the East Region, one of the Company’s key Medicare geographies.

(14) Mrs. Zipperle currently serves as Senior Vice President, Chief Accounting Officer, having held this position since December 2014. Mrs. Zipperle previously served as the Vice President - Finance from January 2013 until her election to her current role, and as the Assistant Controller from January 1998 until January 2013.

Executive officers are elected annually by our Board of Directors and serve until their successors are elected or until resignation or removal. There are no family relationships among any of our executive officers.

Section 16(a) Beneficial Ownership Reporting Compliance

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 18, 2019 appearing under the caption “Section 16(a) Beneficial Ownership Reporting Compliance” of such Proxy Statement.

Code of Conduct for Chief Executive Officer and Senior Financial Officers

We have adopted a Code of Conduct for the Chief Executive Officer and Senior Financial Officers, violations of which should be reported to the Audit Committee. The code may be viewed through the Investor Relations section of our web site at www.humana.com. Any amendment to or waiver of the application of the Code of Conduct for the Chief Executive Officer and Senior Financial Officers will be promptly disclosed through the Investor Relations section of our web site at www.humana.com.

Code of Business Conduct and Ethics

Since 1995, we have operated under an omnibus Code of Ethics and Business Conduct, currently known as the Humana Inc. Ethics Every Day. All employees and directors are required to annually affirm in writing their acceptance of the code. The Humana Inc. Ethics Every Day was adopted by our Board of Directors in June 2014, replacing a previous iteration of our Code of Ethics and Business Conduct – the Humana Inc. Principles of Business Ethics – as the document to comply with the New York Stock Exchange Corporate Governance Standard 303A.10. The Humana Inc. Ethics Every Day is available on our web site at www.humana.com, and any waiver of the application of the Ethics Every Day with respect to directors or executive officers must be made by the Board of Directors and will be promptly disclosed on our web site at www.humana.com.

Corporate Governance Items

We have made available free of charge on or through the Investor Relations section of our web site at www.humana.com our annual reports on Form 10-K, quarterly reports on Form 10-Q, proxy statements, and all of our other reports, and, if applicable, amendments to those reports filed or furnished pursuant to Section 13(a) of the Exchange Act, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. Also available on our Internet web site is information about our corporate governance, including:

• a determination of independence for each member of our Board of Directors;

• the name, membership, role, and charter of each of the various committees of our Board of Directors;

• the name(s) of the directors designated as a financial expert under rules and regulations promulgated by the SEC;

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• the responsibility of the Company’s Lead Independent Director, if applicable, to convene, set the agenda for, and lead executive sessions of the non-management directors;

• the pre-approval process of non-audit services provided by our independent accountants;

• our by-laws and Certificate of Incorporation;

• our Majority Vote policy;

• our Related Persons Transaction Policy;

• the process by which interested parties can communicate with directors;

• the process by which stockholders can make director nominations (pursuant to our By-laws);

• our Corporate Governance Guidelines;

• our Policy Regarding Transactions in Company Securities, Inside Information and Confidentiality;

• Stock Ownership Guidelines for directors and for executive officers;

• the Humana Inc. Ethics Every Day and any waivers thereto; and

• the Code of Conduct for the Chief Executive Officer and Senior Financial Officers and any waivers thereto.

Additional information about these items can be found in, and is incorporated by reference to, our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 18, 2019.

Material Changes to the Procedures by which Security Holders May Recommend Nominees to the Registrant’s Board of Directors

None.

Audit Committee Financial Expert

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 18, 2019 appearing under the caption “Corporate Governance – Audit Committee” of such Proxy Statement.

Audit Committee Composition and Independence

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 18, 2019 appearing under the caption “Corporate Governance – Committee Membership and Attendance” of such Proxy Statement.

ITEM 11. EXECUTIVE COMPENSATION

Additional information required by this Item is incorporated herein by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 18, 2019.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

Equity compensation plan information

We maintain plans under which options to purchase our common stock and awards of restricted stock may be made to officers, directors, key employees, and consultants. Stock options are granted with an exercise price equal to the fair market value of the underlying common stock on the date of grant. Our stock plans, as approved by the Board of Directors and stockholders, define fair market value as the average of the highest and lowest stock prices reported on the composite tape by the New York Stock Exchange on a given date. Exercise provisions vary, but most options vest in whole or in part 1 to 3 years after grant and expire up to 7 years after grant.

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Information concerning stock option awards and the number of securities remaining available for future issuance under our equity compensation plans in effect as of December 31, 2018 follows:

Plan category	(a) Number of  securities to be issued upon exercise of outstanding options, warrants and rights	(b) Weighted-average exercise price of outstanding options, warrants and rights		(c) Number of  securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column(a))
Equity compensation plans approved by     security holders (1)	677,648	$	213.171	4,673,360	(2)(3)
Equity compensation plans not approved     by security holders	—	—		—
Total	677,648	$	213.171	4,673,360

(1) The above table does not include awards of shares of restricted stock or restricted stock units. For information concerning these awards, see Note 13.

(2) The Humana Inc. 2011 Stock Incentive Plan was approved by stockholders at the Annual Meeting held on April 21, 2011. On July 5, 2011, 18.5 million shares were registered with the Securities and Exchange Commission on Form S-8.

(3) Of the number listed above, 2,040,768 can be issued as restricted stock at December 31, 2018 (giving effect to the provision that one restricted share is equivalent to 2.29 stock options in the 2011 Plan).

The information under the captions “Security Ownership of Certain Beneficial Owners of Company Common Stock” and “Security Ownership of Directors and Executive Officers” in our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 18, 2019, is herein incorporated by reference.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 18, 2019 appearing under the captions “Certain Transactions with Management and Others” and “Corporate Governance – Independent Directors” of such Proxy Statement.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 18, 2019 appearing under the caption “Audit Committee Report” of such Proxy Statement.

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PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a)	The financial statements, financial statement schedules and exhibits set forth below are filed as part of this report.
(1)	Financial Statements – The response to this portion of Item 15 is submitted as Item 8 of Part II of this report.
(2)	The following Consolidated Financial Statement Schedules are included herein:
	Schedule I	Parent Company Condensed Financial Information at December 31, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016
	Schedule II	Valuation and Qualifying Accounts for the years ended December 31, 2018, 2017 and 2016

All other schedules have been omitted because they are not applicable.

(3) Exhibits:

3(a)	Restated Certificate of Incorporation of Humana Inc. filed with the Secretary of State of Delaware on November 9, 1989, as restated to incorporate the amendment of January 9, 1992, and the correction of March 23, 1992 (incorporated herein by reference to Exhibit 4(i) to Humana Inc.’s Post-Effective Amendment No.1 to the Registration Statement on Form S-8 (Reg. No. 33-49305) filed February 2, 1994).
(b)	Humana Inc. Amended and Restated By-Laws of Humana Inc., effective as of December 14, 2017 (incorporated herein by reference to Exhibit 3(b) to Humana Inc.’s Current Report on Form 8-K filed on December 14, 2017).
4(a)	Indenture, dates as of August 5, 2003, by and between Humana Inc. and The Bank of New York, as trustee (incorporated herein by reference to Exhibit 4.1 to Humana Inc.'s Quarterly Report on Form 10-Q for the quarter ended September 30, 2003, File No. 001-05975).
(b)	First Supplemental Indenture, dated as of August 5, 2003, by and between Humana Inc. and The Bank of New York, as trustee (incorporated herein by reference to Exhibit 4.2 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2003, File No. 001-05975).
(c)	Second Supplemental Indenture, dated as of May 31, 2006, by and between Humana Inc. and The Bank of New York Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.1 to Humana Inc.’s Current Report on Form 8-K filed on May 31, 2006, File No.001-05975).
(d)	Third Supplemental Indenture, dated as of June 5, 2008, by and between Humana Inc. and The Bank of New York Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.1 to Humana Inc.’s Current Report on Form 8-K filed on June 5, 2008).
(e)	Fourth Supplemental Indenture, dated as of June 5, 2008, by and between Humana Inc. and The Bank of New York Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.3 to Humana Inc.’s Current Report on Form 8-K filed on June 5, 2008).
(f)	Indenture, dated as of March 30, 2006, by and between Humana Inc. and The Bank of New York Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.2 to Humana Inc.’s Registration Statement on Form S-3 filed on March 31, 2006, Req. No. 333-132878).

143

(g)	There are no instruments defining the rights of holders with respect to long-term debt in excess of 10 percent of the total assets of Humana Inc. on a consolidated basis. Other long-term indebtedness of Humana Inc. is described herein in Note 12 to Consolidated Financial Statements. Humana Inc. agrees to furnish copies of all such instruments defining the rights of the holders of such indebtedness not otherwise filed as an Exhibit to this Annual Report on Form 10-K to the Commission upon request.
(h)	Fifth Supplemental Indenture, dated as of December 10, 2012, by and between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.1 to Humana Inc.’s Current Report on Form 8-K filed on December 10, 2012).
(i)	Sixth Supplemental Indenture, dated as of December 10, 2012, by and between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.3 to Humana Inc.’s Current Report on Form 8-K filed on December 10, 2012).
(j)	Seventh Supplemental Indenture, dated as of September 19, 2014, by and between Humana Inc. and The Bank of New York, Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.2 to Humana Inc.’s Current Report on Form 8-K filed on September 19, 2014).
(k)	Eighth Supplemental Indenture, dated as of September 19, 2014, by and between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.4 to Humana Inc.’s Current Report on Form 8-K filed on September 19, 2014).
(l)	Ninth Supplemental Indenture, dated as of September 19, 2014, by and between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.6 to Humana Inc.’s Current Report on Form 8-K filed on September 19, 2014).
(m)	Tenth Supplemental Indenture, dated March 16, 2017, between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.2 to Humana Inc.’s Current Report on Form 8-K filed on March 16, 2017.
(n)	Eleventh Supplemental Indenture, dated March 16, 2017, between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.4 to Humana Inc.’s Current Report on Form 8-K filed on March 16, 2017.
(o)	Twelfth Supplemental Indenture, dated December 21, 2017, between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.2 to Humana Inc.’s Current Report on Form 8-K filed on December 21, 2017.
(p)	Thirteenth Supplemental Indenture, dated December 21, 2017, between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.4 to Humana Inc.’s Current Report on Form 8-K filed on December 21, 2017.
10(a)*	Form of Company’s Restricted Stock Unit Agreement and Agreement not to Compete or Solicit under the 2011 Stock Incentive Plan (with retirement provisions) (incorporated herein by reference to Exhibit 10(a) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015).
(b)*	Form of Company’s Restricted Stock Unit Agreement and Agreement not to Compete or Solicit under the 2011 Stock Incentive Plan (without retirement provisions) (incorporated herein by reference to Exhibit 10(b) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015).
(c)*	Humana Inc. Executive Management Incentive Compensation Plan, as amended and restated February 21, 2008 (incorporated herein by reference to Appendix A to Humana Inc.’s Proxy Statement with respect to the Annual Meeting of Stockholders held on April 24, 2008).
(d)*	Trust under Humana Inc. Deferred Compensation Plans (incorporated herein by reference to Exhibit 10(p) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 1999, File No. 001-05975).
(e)*	The Humana Inc. Deferred Compensation Plan for Non-Employee Directors (as amended on October 18, 2012) (incorporated herein by reference to Exhibit 10(m) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012).

144

(f)*†	Humana Inc. Executive Severance Policy, effective as of March 1, 2019.
(g)*	Humana Inc. Deferred Compensation Plan (incorporated herein by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-8 (Reg. No. 333-171616), filed on January 7, 2011).
(h)*	Humana Retirement Equalization Plan, as amended and restated as of January 1, 2011 (incorporated herein by reference to Exhibit 10(p) to Humana Inc.’s Annual Report on Form 10-K filed on February 18, 2011).
(i)*	Letter agreement with Humana Inc. officers concerning health insurance availability (incorporated herein by reference to Exhibit 10(mm) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 1994, File No. 001-05975).
(j)*	Executive Long-Term Disability Program (incorporated herein by reference to Exhibit 10(a) to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2004).
(k)*	Indemnity Agreement (incorporated herein by reference to Appendix B to Humana Inc.’s Proxy Statement with respect to the Annual Meeting of Stockholders held on January 8, 1987).
(l)*	Form of Company’s Restricted Stock Unit Agreement and Agreement not to Solicit under the 2011 Stock Incentive Plan (with retirement provisions) (incorporated herein by reference to Exhibit 10(o) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015).
(m)*	Summary of the Company’s Financial Planning Program for our executive officers (incorporated herein by reference to Exhibit 10(v) to Humana’s Inc.’s Annual Report on Form 10-K filed on February 22, 2013.
(n)*	Form of Company’s Restricted Stock Unit Agreement and Agreement not to Solicit under the 2011 Stock Incentive Plan (without retirement provisions) (incorporated herein by reference to Exhibit 10(q) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015).
(o)	Five-Year $2 Billion Amended and Restated Credit Agreement , dated as of May 22, 2017, among Humana Inc., and JPMorgan Chase Bank, N.A. as Agent and as CAF Loan Agent, Bank of America, N.A. as Syndication Agent, Citibank, N.A., PNC Bank, National Association, U.S. Bank National Association, and Wells Fargo Bank, National Association, as Documentation Agents, and J.P. Morgan Chase Bank, N.A., Merrill Lynch, Pierce, Fenner & Smith Incorporated, Citigroup Global Markets, Inc., PNC Capital Markets LLC, U.S. Bank National Association, and Wells Fargo Securities, LLC, as Joint-Lead Arrangers and Joint Bookrunners (incorporated herein by reference to Exhibit 10 to Humana Inc.’s Current Report on Form 8-K filed on May 22, 2017).
(p)	Form of CMS Coordinated Care Plan Agreement (incorporated herein by reference to Exhibit 10.1 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005, File No. 001-05975).
(q)	Form of CMS Private Fee for Service Agreement (incorporated herein by reference to Exhibit 10.2 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005, File No. 001-05975).
(r)	Addendum to Agreement Providing for the Operation of a Medicare Voluntary Prescription Drug Plan (incorporated herein by reference to Exhibit 10.3 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005, File No. 001-05975).
(s)	Addendum to Agreement Providing for the Operation of an Employer/Union-only Group Medicare Advantage Prescription Drug Plan (incorporated herein by reference to Exhibit 10.4 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005, File No. 001-05975).
(t)	Addendum to Agreement Providing for the Operation of an Employer/Union-only Group Medicare Advantage-Only Plan (incorporated herein by reference to Exhibit 10.5 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005, File No. 001-05975).
(u)	Addendum to Agreement Providing for the Operation of a Medicare Advantage Regional Coordinated Care Plan (incorporated herein by reference to Exhibit 10.6 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005, File No. 001-05975).

145

(v)	Explanatory Note regarding Medicare Prescription Drug Plan Contracts between Humana and CMS (incorporated herein by reference to Exhibit 10(nn) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005, File No. 001-05975).
(w)*	Humana Inc. 2011 Stock Incentive Plan (incorporated herein by reference to Appendix A to Humana Inc.’s Proxy Statement with respect to the Annual Meeting of Stockholders held on April 21, 2011).
(x)*	Amended and Restated Employment Agreement, dated as of February 27, 2014, by and between Humana Inc. and Bruce D. Broussard (incorporated herein by reference to Exhibit 10.1 to Humana Inc.’s current report on Form 8-K filed on February 28, 2014).
(y)*	Amendment to the Amended and Restated Employment Agreement between Humana Inc. and Bruce D. Broussard, dated July 2, 2015 (incorporated herein by reference to Exhibit 10.1 to Humana Inc.’s current report on Form 8-K filed on July 9, 2015).
(z)*	Amendment No. 2, dated as of August 16, 2018, to the Amended and Restated Employment Agreement between Humana Inc. and Bruce D. Broussard, dated as of February 27, 2014 (incorporated herein by reference to Exhibit 10.1 to Humana Inc.s Current Report on Form 8-K, filed on August 20, 2018).
(aa)*†	Humana Inc. Change in Control Policy, effective March 1, 2019.
(bb)	Form of Commercial Paper Dealer Agreement between Humana Inc., as Issuer, and the Dealer party thereto (incorporated herein by reference to Exhibit 10.1 to Humana Inc.’s current report on Form 8-K filed on October 7, 2014).
(cc)	Form of Company's Stock Option Agreement under the 2011 Stock Incentive Plan (Incentive Stock Options) (incorporated herein by reference to Exhibit 10(jj) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015).
(dd)*	Form of Company's Stock Option Agreement under the 2011 Stock Incentive Plan (Non-Qualified Stock Options with Non-Compete/Non-Solicit) (incorporated herein by reference to Exhibit 10(kk) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015).
(ee)*	Form of Company's Restricted Stock Unit Agreement with Performance Vesting and Agreementnot to Compete or Solicit under the 2011 Stock Incentive Plan (incorporated herein by reference to Exhibit 10(nn) to Humana Inc.’s Annual Report on Form 10-K filed on February 16, 2018).
(ff)*†	Form of Company’s Restricted Stock Unit Agreement and Agreement not to Compete or Solicit under the 2011 Stock Incentive Plan (with retirement provisions).
(gg)*†	Form of Company's Restricted Stock Unit Agreement with Performance Vesting and Agreement not to Compete or Solicit under the 2011 Stock Incentive Plan.
(hh)*†	Form of Company’s Incentive Stock Option Agreement and Agreement not to Compete or Solicit under the 2011 Stock Incentive Plan.
(ii)*†	Form of Company’s Stock Option Agreement and Agreement not to Compete or Solicit under the 2011 Stock Incentive Plan (Non-Qualified Stock Options).
(jj)*†	Humana Inc. Compensation Recoupment Policy, effective February 21, 2019.
14	Code of Conduct for Chief Executive Officer & Senior Financial Officers (incorporated herein by reference to Exhibit 14 to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2003).
21 †	List of subsidiaries.
23 †	Consent of PricewaterhouseCoopers LLP.
31.1 †	CEO certification pursuant to Rule 13a-14(a)/15d-14(a).

146

31.2 †	CFO certification pursuant to Rule 13a-14(a)/15d-14(a).
32 †	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes – Oxley Act of 2002.

101 The following materials from Humana Inc.'s Annual Report on Form 10-K formatted in XBRL (Extensible Business Reporting Language): (i) the Consolidated Balance Sheets at December 31, 2018 and 2017; (ii) the Consolidated Statements of Income for the years ended December 31, 2018, 2017 and 2016; (iii) the Consolidated Statements of Comprehensive Income for the years ended December 31, 2018, 2017 and 2016; (iv) the Consolidated Statements of Stockholders’ Equity as of December 31, 2018, 2017, and 2016; (v) the Consolidated Statements of Cash Flows for the years ended December 31, 2018, 2017 and 2016; and (vi) Notes to Consolidated Financial Statements.

*Exhibits 10(a) through and including 10(n), and Exhibits 10(w) through and including 10(aa), as well as Exhibits 10(cc) through and including Exhibit 10(jj) are compensatory plans or management contracts.

**Pursuant to Rule 24b-2 of the Exchange Act, confidential portions of this exhibit have been omitted and filed separately with the Securities and Exchange Commission pursuant to a request for confidential treatment.

†Submitted electronically with this report.

147

Humana Inc.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED BALANCE SHEETS

	December 31,
	2018			2017
	(in millions, except share amounts)
ASSETS
Current assets:
Cash and cash equivalents	$	265		$	383
Investment securities	313			305
Receivable from operating subsidiaries	1,306			1,042
Other current assets	628			245
Total current assets	2,512			1,975
Property and equipment, net	1,209			1,091
Investments in subsidiaries	16,951			16,810
Equity method investment in Kindred at Home	1,047			—
Other long-term assets	359			426
Total assets	$	22,078		$	20,302
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Payable to operating subsidiaries	$	4,487		$	4,311
Current portion of notes payable to operating subsidiaries	28			28
Book overdraft	38			41
Short-term debt	1,694			150
Other current liabilities	791			896
Total current liabilities	7,038			5,426
Long-term debt	4,375			4,770
Other long-term liabilities	504			264
Total liabilities	11,917			10,460
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	—			—
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,594,841 shares issued at December 31, 2018 and 198,572,458 shares issued at December 31, 2017	33			33
Capital in excess of par value	2,535			2,445
Retained earnings	15,072			13,670
Accumulated other comprehensive income (loss)	(159		)	19
Treasury stock, at cost, 63,028,169 shares at December 31, 2018 and 60,893,762 shares at December 31, 2017	(7,320		)	(6,325		)
Total stockholders’ equity	10,161			9,842
Total liabilities and stockholders’ equity	$	22,078		$	20,302

See accompanying notes to the parent company financial statements.

148

Humana Inc.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED STATEMENTS OF INCOME

	For the year ended December 31,
	2018			2017			2016
	(in millions)
Revenues:
Management fees charged to operating subsidiaries	$	1,666		$	1,864		$	1,683
Investment and other income, net	30			57			42
	1,696			1,921			1,725
Expenses:
Operating costs	1,468			1,801			1,519
Merger termination fee and related costs, net	—			(936		)	104
Depreciation	342			332			302
Interest	218			243			189
	2,028			1,440			2,114
Other expense, net	33			—			—
Loss on sale of business	782			—			—
(Loss) income before income taxes and equity in net earnings of subsidiaries	(1,147		)	481			(389		)
(Benefit) provision for income taxes	(542		)	61			(107		)
(Loss) income before equity in net earnings of subsidiaries	(605		)	420			(282		)
Equity in net earnings of subsidiaries	2,277			2,028			896
Equity in net earnings of Kindred at Home	11			—			—
Net income	$	1,683		$	2,448		$	614

See accompanying notes to the parent company financial statements.

149

Humana Inc.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED STATEMENTS OF COMPREHENSIVE INCOME

	For the year ended December 31,
	2018			2017			2016
	(in millions)
Net income	$	1,683		$	2,448		$	614
Other comprehensive income (loss):
Change in gross unrealized investment losses/gains	(189		)	149			(101		)
Effect of income taxes	51			(55		)	38
Total change in unrealized investment gains/losses, net of tax	(138		)	94			(63		)
Reclassification adjustment for net realized gains included in investment income	(53		)	(14		)	(96		)
Effect of income taxes	17			5			35
Total reclassification adjustment, net of tax	(36		)	(9		)	(61		)
Other comprehensive (loss) income, net of tax	(174		)	85			(124		)
Comprehensive income attributable to our equity method investment in Kindred at Home	(4		)	—			—
Comprehensive income	$	1,505		$	2,533		$	490

See accompanying notes to the parent company financial statements.

150

Humana Inc.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED STATEMENTS OF CASH FLOWS

	For the year ended December 31,
	2018			2017			2016
	(in millions)
Net cash provided by operating activities	$	2,719		$	2,423		$	1,848
Cash flows from investing activities:
Acquisitions, net of cash acquired	(354		)	—			—
Acquisitions, equity method investment in Kindred at Home	(1,095		)	—			—
Capital contributions to operating subsidiaries	(697		)	(695		)	(895		)
Purchases of investment securities	(145		)	(53		)	(151		)
Proceeds from sale of investment securities	35			—			25
Maturities of investment securities	59			51			143
Purchases of property and equipment, net	(465		)	(359		)	(382		)
Net cash used in investing activities	(2,662		)	(1,056		)	(1,260		)
Cash flows from financing activities:
Proceeds from issuance of senior notes, net	—			1,779			—
Proceeds from issuance (repayments) of commercial paper, net	485			(153		)	(2		)
Proceeds from term loan	1,000			—			—
Repayment of term loan	(350		)	—			—
Repayment of long-term debt	—			(800		)	—
Change in book overdraft	(3		)	3			5
Common stock repurchases	(1,090		)	(3,365		)	(104		)
Dividends paid	(265		)	(220		)	(177		)
Proceeds from stock option exercises and other	48			62			11
Net cash used in financing activities	(175		)	(2,694		)	(267		)
(Decrease) increase in cash and cash equivalents	(118		)	(1,327		)	321
Cash and cash equivalents at beginning of year	383			1,710			1,389
Cash and cash equivalents at end of year	$	265		$	383		$	1,710

See accompanying notes to the parent company financial statements.

151

Humana Inc.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

NOTES TO CONDENSED FINANCIAL STATEMENTS

1. BASIS OF PRESENTATION

Parent company financial information has been derived from our consolidated financial statements and excludes the accounts of all operating subsidiaries. This information should be read in conjunction with our consolidated financial statements.

2. TRANSACTIONS WITH SUBSIDIARIES

Management Fee

Through intercompany service agreements approved, if required, by state regulatory authorities, Humana Inc., our parent company, charges a management fee for reimbursement of certain centralized services provided to its subsidiaries including information systems, disbursement, investment and cash administration, marketing, legal, finance, and medical and executive management oversight.

Dividends

Cash dividends received from subsidiaries and included as a component of net cash provided by operating activities were $2.3 billion in 2018, $1.4 billion in 2017, and $0.8 billion in 2016.

Guarantee

Through indemnity agreements approved by state regulatory authorities, certain of our regulated subsidiaries generally are guaranteed by our parent company in the event of insolvency for: (1) member coverage for which premium payment has been made prior to insolvency; (2) benefits for members then hospitalized until discharged; and (3) payment to providers for services rendered prior to insolvency. Our parent has also guaranteed the obligations of our military services subsidiaries and funding to maintain required statutory capital levels of certain other regulated subsidiaries.

3. REGULATORY REQUIREMENTS

Certain of our subsidiaries operate in states that regulate the payment of dividends, loans, or other cash transfers to Humana Inc., our parent company, and require minimum levels of equity as well as limit investments to approved securities. The amount of dividends that may be paid to Humana Inc. by these subsidiaries, without prior approval by state regulatory authorities, or ordinary dividends, is limited based on the entity’s level of statutory income and statutory capital and surplus. If the dividend, together with other dividends paid within the preceding twelve months, exceeds a specified statutory limit or is paid from sources other than earned surplus, it is generally considered an extraordinary dividend requiring prior regulatory approval. In most states, prior notification is provided before paying a dividend even if approval is not required.

Although minimum required levels of equity are largely based on premium volume, product mix, and the quality of assets held, minimum requirements vary significantly at the state level. Our state regulated insurances subsidiaries had aggregate statutory capital and surplus of approximately$7.6 billion and $8.0 billion as of December 31, 2018 and 2017, respectively, which exceeded aggregate minimum regulatory requirements of$5.2 billion and $4.8 billion, respectively. The amount of ordinary dividends that may be paid to our parent company in2019is approximately$1 billionin the aggregate. The amount, timing and mix of ordinary and extraordinary dividend payments will vary due to state regulatory requirements, the level of excess statutory capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix. Actual dividends that were paid to our parent company were approximately$2.3 billion in 2018, $1.4 billion in 2017, and $0.8 billionin 2016.

Our use of operating cash flows derived from our non-insurance subsidiaries, such as in our Healthcare Services segment, is generally not restricted by state departments of insurance (or comparable state regulators).

152

4. ACQUISITIONS AND DIVESTITURES

Refer to Note 3 of the notes to consolidated financial statements in this Annual Report on Form 10-K for a description of certain acquisitions and divestitures. During 2018, 2017 and 2016, we funded certain non-regulated subsidiary acquisitions with contributions from Humana Inc., our parent company, included in capital contributions in the condensed statement of cash flows.

5. INCOME TAXES

Refer to Note 11 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of income taxes.

6. DEBT

Refer to Note 12 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of debt.

7. STOCKHOLDER’S EQUITY

Refer to Note 15 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of stockholders’ equity, including stock repurchases and stockholder dividends.

153

Humana Inc.

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS

For the Years Ended December 31, 2018, 2017, and 2016

(in millions)

						Additions
	Balance  at Beginning of Period			Acquired/(Disposed) Balances		Charged (Credited)  to Costs and Expenses			Charged  to Other Accounts (1)			Deductions or Write-offs			Balance at End  of Period
Allowance for loss on receivables:
2018	$	96		$	—	$	36		$	(29	)	$	(24	)	$	79
2017	118			—		20			(10		)	(32		)	96
2016	101			—		39			19			(41		)	118
Deferred tax asset valuation allowance:
2018	(49		)	—		(5		)	—			—			(54		)
2017	(49		)	—		—			—			—			(49		)
2016	(42		)	—		(7		)	—			—			(49		)

(1) Represents changes in retroactive membership adjustments to premiums revenue and contractual allowances adjustments to services revenue as more fully described in Note 2 to the consolidated financial statements included in this annual report on Form 10-K.

154

ITEM 16. FORM 10-K SUMMARY

None.

155

SIGNATURES

Pursuant to the requirements of Sections 13 or 15(d) of the Securities Exchange Act of 1934, the Company has duly caused this report to be signed on its behalf by the undersigned, thereto duly authorized.

HUMANA INC.
By:	/s/    BRIAN A. KANE
	Brian A. Kane
	Chief Financial Officer  (Principal Financial Officer)
Date:	February 21, 2019

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Company and in the capacities and on the date indicated.

Signature	Title	Date
/s/    BRIAN A. KANE	Chief Financial Officer (Principal Financial Officer)	February 21, 2019
Brian A. Kane
/s/    CYNTHIA H. ZIPPERLE	Senior Vice President and Chief Accounting Officer (Principal Accounting Officer)	February 21, 2019
Cynthia H. Zipperle
/s/    BRUCE D. BROUSSARD	President and Chief Executive Officer, Director (Principal Executive Officer)	February 21, 2019
Bruce D. Broussard
/s/    KURT J. HILZINGER	Chairman of the Board	February 21, 2019
Kurt J. Hilzinger
/s/    FRANK BISIGNANO	Director	February 21, 2019
Frank Bisignano
/s/    KAREN DESALVO MD, MPH, MSc	Director	February 21, 2019
Karen DeSalvo, MD, MPH, MSc
/s/    FRANK A. D’AMELIO	Director	February 21, 2019
Frank A. D’Amelio
/s/    W. ROY DUNBAR	Director	February 21, 2019
W. Roy Dunbar
/s/    DAVID A. JONES, JR.	Director	February 21, 2019
David A. Jones, Jr.
/s/    WILLIAM J. MCDONALD	Director	February 21, 2019
William J. McDonald
/s/    WILLIAM E. MITCHELL	Director	February 21, 2019
William E. Mitchell
/s/    DAVID B. NASH, M.D.	Director	February 21, 2019
David B. Nash, M.D.
/s/    JAMES J. O’BRIEN	Director	February 21, 2019
James J. O’Brien
/s/    MARISSA T. PETERSON	Director	February 21, 2019
Marissa T. Peterson

156

EX-10.AA

Exhibit 10(aa) HUMANA INC. CHANGE IN CONTROL POLICY This Humana Inc. Change in Control Policy (this “Policy”) has been adopted by the Organization & Compensation Committee (the “Committee”) of the Board of Directors of the Company to avoid the departure of and provide protection to Executives in the event of a Change in Control in order that they may act in the best interest of all shareholders and to reinforce and encourage their continued attention and dedication to their duties without the distraction and concern for the uncertainty that would result from the effects a Change in Control would have on their personal situations. This Policy shall be effective as of the Effective Date as provided herein, and shall apply to all Executives (as defined herein). Definitions. For purposes of this Policy, the following terms shall have the following meaning: “Annual Base Salary” shall mean an Executive’s stated annual compensation without regard to any bonus, perquisite or other benefits. “Board” means the Board of Directors of the Company. “Cause” shall mean a termination by reason of the conviction of Executive, by a court of competent jurisdiction and following the exhaustion of all possible appeals, of a criminal act involving the Company or its assets. “CEO” shall mean the Company’s President and Chief Executive Officer. “CEO Direct Reports” shall mean Executive Officers of the Company who are direct reports to the Company’s President and Chief Executive Officer. “Change in Control” shall have the meaning set forth in Exhibit A. “Code” means the Internal Revenue Code of 1986, as amended from time to time. “Company” means Humana Inc., a Delaware corporation, and any successor thereto. “Compensation Committee” means the Organization and Compensation Committee of the Board. “Date of Termination” shall mean the date specified in the Notice of Termination, not to exceed thirty (30) days from the date such Notice of Termination is given, or as otherwise agreed to by Executive and the Company.

“Executive” shall mean all eligible employees, which includes the CEO Direct Reports, other Executive Officers, and such other individuals as identified by the Compensation Committee who do not have separate agreements or arrangements that provide for payments and/or benefits upon a Change in Control (other than equity related agreements or arrangements). “Executive Officer” shall include those executive officers designated by the Board under Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended. “Good Reason” shall mean the occurrence after a Change in Control of any of the following events without Executive’s express written consent: (i) Any material reduction in Executive’s title, authority or responsibilities, including reporting responsibilities; (ii) A reduction by the Company in Executive’s Annual Base Salary as in effect on the date of the Change in Control or as the same may be increased from time to time; (iii) The relocation of Executive’s office at which Executive is to perform his or her duties to a location more than thirty (30) miles from the location at which Executive performed his or her duties prior to the Change in Control; (iv) The failure by the Company to continue in effect any incentive, bonus or other compensation plan in which Executive participates, unless the Company substitutes a substantially equivalent benefit; (v) The failure by the Company to continue in effect any Executive benefit plan (including any medical, hospitalization, life insurance, dental or disability benefit plan in which Executive participated) or any material fringe benefit or perquisite enjoyed by Executive at the time of the Change in Control, unless the Company substitutes benefits which, in the aggregate, are equivalent; or (vi) The failure of the Company to obtain a satisfactory agreement from any successor or assign of the Company to assume and agree to perform this Policy. A termination of employment by the Executive for Good Reason shall only be effectuated after giving the Company written notice of the termination, setting forth the conduct of the Company that constitutes Good Reason, within 30 days of the first date on which the Executive has knowledge of such conduct. The Executive shall further provide the Company with at least 30 days following the date on which such written notice is provided to cure such conduct. If the Company fails to cure such conduct, a termination of employment by the Executive for Good Reason shall be effective on the day following the expiration of such 30-day cure period. “Effective Date” means March 1, 2019, which is the date that this Policy is effective. 2

“Exchange Act” means the Securities Exchange Act of 1934, and any successor statute, as it may be amended from time to time. “Notice of Termination” shall mean a notice which shall indicate the specific termination provision in this Policy which is relied upon and shall set forth in reasonable detail the facts and circumstances claimed to provide a basis for termination of Executive’s employment under the provision so indicated. Any purported termination by the Company or by Executive hereunder shall not be effective until communicated by written Notice of Termination to the other party. “Payments” means any payment or distribution of any type to Executive or for Executive’s benefit by the Company, any affiliate of the Company, any Person who acquires ownership or effective control of the Company or ownership of a substantial portion of the Company’s assets (within the meaning of Section 280G of the Code and the regulations thereunder), or any affiliate of such Person, whether paid or payable or distributed or distributable pursuant to the terms of this Policy or otherwise. “Person” means any individual, corporation, partnership, limited liability company, association, trust or other entity or organization, including a government or political subdivision or an agency or instrumentality thereof. “Qualifying Termination” means (i) by the Company other than for Cause, or by Executive for Good Reason within twenty-four (24) months following a Change in Control and during the term of this Policy, or (ii) by the Company other than for Cause at any time prior to the date of a Change in Control and such termination occurred after the Company entered into a definitive agreement, the consummation of which would constitute a Change in Control. “Section 409A” shall mean Section 409A of the Code. “Separation from Service” means a termination of the employment relationship of Executive with the Company or an affiliate within the meaning of Section 409A and Treasury Regulation section 1.409A-1(h) or any successor thereto. “Severance Multiple” means (i) for the CEO, two and a half (2.5) times, (ii) for CEO Direct Reports, two (2) times, and (iii) for other Executives, no greater than one and a half (1.5) times. “Severance Period” means (i) for the CEO, thirty (30) months, (ii) for CEO Direct Reports, twenty-four (24) months, and (iii) for other Executives, no greater than eighteen (18) months or such other period as the Committee shall determine. “Severance Rate” means an amount equal to the sum of (A) Executive’s Annual Base Salary at the greater of the rate in effect at the time the Change in Control occurred, if applicable, or when the Notice of Termination was given plus (B) the target annual bonus or incentive compensation which could have been earned by Executive (including, but not limited to, any target sales incentive compensation, to the extent applicable) calculated as if all relevant goals had been met during the then-current fiscal year of the Company pursuant to the terms of the incentive compensation plan in which Executive participates. With respect to clause (B), If there 3

is no incentive compensation plan in effect at the time the Notice of Termination is given, then for purposes of clause (B) hereof it shall be assumed that the amount of incentive compensation to be paid to Executive shall be the target amount under any incentive compensation plan in which Executive participated at the date of the Change in Control, if applicable, or the most recent plan participated in, whichever would be greater. Benefits. (a) In the event of a Qualifying Termination, subject to Sections 3(d), 4 and 5 hereof, the Company shall pay to Executive in a lump sum within fifteen (15) business days after the Date of Termination: (i) Executive’s base salary earned but not yet paid through the Date of Termination at the greater of the rate in effect at the time the Change in Control occurred, if applicable, or when the Notice of Termination was given, plus any bonuses or incentive compensation which, pursuant to the terms of any compensation or benefit plan, have been earned and are payable as of the Date of Termination, but have not actually been paid by the Date of Termination. For purposes of this Policy, bonuses and incentive compensation shall be considered payable if all conditions for earning them have been met and any requirement that Executive be actively employed as of the date of payment shall be disregarded; (ii) A lump sum in an amount equal to (x) the applicable Severance Multiple for such Executive multiplied by (y) the Severance Rate. (b) In addition, in the event of a Qualifying Termination the Company shall, for the period stated below, maintain in full force and effect for the benefit of Executive and Executive’s dependents and beneficiaries, at the Company’s expense, all life insurance, health insurance, dental insurance, accidental death and dismemberment insurance and disability insurance under plans and programs in which Executive and/or Executive’s dependents and beneficiaries participated immediately prior to the Consummation of the Change in Control, provided that continued participation is possible under the general terms and provisions of such plans and programs (the “Extended Benefits”). The Extended Benefits shall be continued until the earlier of (A) the end of the applicable Severance Period for such Executive, and (B) the effective date of Executive’s coverage under equivalent benefits from a new employer (provided that no such equivalent benefits shall be considered effective unless and until all pre-existing condition limitations and waiting period restrictions have been waived or have otherwise lapsed). If participation in any such plan or program is barred, the Company shall arrange at its own expense to provide Executive with benefits substantially similar to those which Executive would have been entitled to receive under such plans and programs. At the end of the period of coverage, Executive shall have the right to have assigned to him or her, at no cost and with no apportionment of prepaid premiums, any assignable insurance policy relating specifically to him or her. At the conclusion of the coverage provided under this Section 3(b), Executive shall be entitled to the continuation for a period of 18 months of the health and dental insurance then being provided to him or her at a cost to him or her equal to the amount then being charged to employees of the Company for such coverage provided pursuant to the Consolidated Omnibus Budget Reconciliation Act (COBRA). The coverage provided pursuant to this Subsection shall be in satisfaction of the Company’s 4

obligation to provide coverage under COBRA. The Company will use all commercially reasonable efforts to provide for the continuation of benefits in a manner that (A) does not subject the benefits to Section 409A and (B) does not cause the benefits to be included in the taxable income of Executive. (c) In addition, upon a Qualifying Termination of employment, the Company will (i) provide an Executive who is the CEO or a CEO Direct Report with financial planning services during the one year period immediately following the Date of Termination on the same terms as the financial planning services were provided to such Executive immediately prior to the Change in Control and (ii) provide eligible individuals with outplacement services through an outplacement firm of the Company’s choosing at a level of services to be determined by the Company, with such services to extend until the earlier of (A) twelve months following the Date of Termination for the CEO or CEO Direct Reports, or six months following the Date of Termination for other Executives, or (B) the date Executive secures full time employment. (d) Benefits under this Policy shall not be duplicative of, and shall be offset by, the same type of benefit payable under an agreement between the Company and Executive or another plan, program or arrangement of the Company covering Executive. To the extent that benefits under this Policy are the same type of benefit payable under such agreement or plan, program or arrangement which is subject to, and not exempt from, the requirements of Section 409A, then the benefits payable under this Policy shall be payable at the same time and in the same form as the benefits payable under such agreement or plan, program or arrangement, but only to the extent that such other benefits are subject to and not exempt from Section 409A. 280G Considerations. Notwithstanding anything to the contrary contained in this Policy, (a) to the extent that any Payments constitute “parachute payments” (within the meaning of Section 280G of the Code), and if (b) such aggregate Payments would, if reduced by all federal, state and local taxes applicable thereto (including the excise tax imposed under Section 4999 of the Code (the “Excise Tax”)), be less than the amount that Executive would receive, after all taxes, if Executive received aggregate Payments equal (as valued under Section 280G of the Code) to only three times Executive’s “base amount” (within the meaning of Section 280G of the Code), less $1.00, then (c) such Payments will be reduced (but not below zero) if and to the extent necessary so that no Payments to be made or benefit to be provided to Executive will be subject to the Excise Tax. All determinations required to be made pursuant to this letter agreement will be made by a nationally recognized accounting firm selected by the Company (the “Accounting Firm”), which will provide detailed supporting calculations (which will include specific information about each Payment (including the amount of each Payment)). For purposes of making the calculations required by this Section 4, the Accounting Firm may make reasonable assumptions and approximations concerning applicable taxes and may rely on reasonable, good faith interpretations concerning the application of Sections 280G and 4999 of the Code. Executive and the Company will furnish to the Accounting Firm such information and documents as the Accounting Firm may reasonably request in order to make a determination under this letter agreement. The Company will bear all costs and make all payments for the Accounting Firm’s services relating to any calculations contemplated by this Section 4 and any such determination by the Accounting Firm will be binding upon Executive and the Company. If a determination is made to reduce the Payments, the Company will reduce or eliminate the Payments (i) by first reducing or eliminating the portion of the Payments relating to the provision of outplacement services, (ii) 5

then by reducing or eliminating cash payments (other than cash payments that are subject to clause (iv) hereof), (iii) then by reducing or eliminating the portion of the Payments which are not payable in cash and are attributable to equity awards (other than that portion of such Payments that are subject to clause (iv) hereof), and (iv) then by reducing or eliminating the portion of the Payments (whether payable in cash or not payable in cash) to which Treasury Regulation § 1.280G-1 Q/A 24(c) applies, in each case in reverse order beginning with payments or benefits which are to be paid the latest in time. It is possible that, after the determinations and selections pursuant to this letter agreement are made, Executive will receive Payments that are, in the aggregate, either more or less than the amount that should have been provided (hereafter referred to as an “Excess Payment” or “Underpayment,” respectively). If it is established, pursuant to a final determination of a court or an Internal Revenue Service proceeding that has been finally and conclusively resolved, that an Excess Payment has been made, then Executive will promptly pay an amount equal to the Excess Payment to the Company. In the event that it is determined (i) by a final determination of a court or (ii) by the Accounting Firm upon request by either Executive or the Company, that an Underpayment has occurred, the Company will promptly pay an amount equal to the Underpayment to Executive. Restrictive Covenants. In consideration of Executive’s employment by the Company and the rights and benefits of Executive provided by this Policy, Executive will enter into agreements that contain certain covenants regarding non-competition, non-solicitation, non- disparagement and specific enforcement with the restricted period for the non-competition and non-solicitation covenants to be the applicable Severance Period for such Executive, commencing upon the Date of Termination, with such covenants to be substantially in the form attached as Exhibit B hereto. Administration. The Compensation Committee is responsible for the administration of this Policy and shall have all powers and duties necessary to fulfill its responsibilities. The Compensation Committee shall determine any and all questions of fact, resolve all questions of interpretation of the Policy which may arise, and exercise all other powers and discretion necessary to be exercised under the terms of the Policy which it is herein given or for which no contrary provision is made. The Compensation Committee shall have full power and discretion to interpret the Policy and related documents, to resolve ambiguities, inconsistencies and omissions, to determine any question of fact, and to determine the rights and benefits, if any, of any Executive or other employee, in accordance with the provisions of the Policy. The Compensation Committee’s decision with respect to any matter shall be final and binding on all parties concerned. The validity of any such interpretation, construction, decision, or finding of fact shall not be given de novo review if challenged in court, by arbitration, or in any other forum, and shall be upheld unless clearly arbitrary or capricious. The Compensation Committee may, from time to time, by action of its appropriate officers, delegate to designated persons or entities the right to exercise any of its powers or the obligation to carry out its duties under the Policy. Section 409A (a) Compliance. To the extent applicable, it is intended that this Policy comply with the provisions of Section 409A, so as to prevent inclusion in gross income of any amounts payable or benefits provided hereunder in a taxable year that is prior to the taxable year or years in which such amounts or benefits would otherwise actually be distributed, provided or 6

otherwise made available to Executive. This Policy shall be construed, administered, and governed in a manner consistent with this intent. If and to the extent that any payment or benefit under this Policy is determined by the Company to constitute “non-qualified deferred compensation” subject to Section 409A and is payable to Executive by reason of Executive’s termination of employment, then such payment or benefit shall be made or provided to Executive only upon a Separation from Service as defined for purposes of Section 409A. Each severance payment under this Policy will be considered a “separate payment” and not one of a series of payments for purposes of Section 409A. To the extent that any benefits to be provided to Executive pursuant to this Policy are considered nonqualified deferred compensation and are reimbursements subject to Treasury Regulation Section 1.409A-3(i)(1)(iv), then (i) the reimbursement of eligible expenses related to such benefits shall be made on or before the last day of Executive’s taxable year following Executive’s taxable year in which the expense was incurred and (ii) notwithstanding anything to the contrary in this Policy or any plan providing for such benefits, the amount of expenses eligible for reimbursement during any taxable year of Executive shall not affect the expenses eligible for reimbursement in any other taxable year. Nothing in this Policy will provide a basis for any person to take action against the Company or its affiliates based on matters covered by Section 409A and in no event will the Company or its affiliates be liable for any additional tax, interest or penalties that may be imposed on Executive under Section 409A or any damages for failing to comply with Section 409A. (b) Six Month Delay for Specified Executives. To the extent that any amount payable or benefit to be provided under this Policy constitutes a nonexempt “nonqualified deferred compensation plan” (as defined in Section 409A) upon a Separation from Service, and to the extent an Executive is deemed to be a “specified employee” (as that term is defined in Section 409A and pursuant to procedures established by the Company) on the Date of Termination, notwithstanding any other provision in this Policy to the contrary, such payment or benefit provision will not be made to Executive during the six month period immediately following the Date of Termination. Instead, on the first business day of the seventh month following the Date of Termination, all amounts that otherwise would have been paid or provided to Executive during the six month period, but were not paid or provided because of this Section 7(b), will be paid or provided to Executive at such time without interest. This six month delay will cease to be applicable if Executive incurs a Separation from Service due to death or if Executive dies before the six month period has expired. Amendment and Termination. (a) This Policy may be amended by the Compensation Committee at any time, or the Compensation Committee may determine at any time that any Executive is no longer eligible to receive benefits under this Policy; provided, however, that any such amendment or determination of eligibility that would adversely affect an Executive will not be applicable without such Executive’s consent until the later of (i) one year following the date of such amendment, and (ii) two years following consummation of a transaction that constitutes a Change of Control if a definitive agreement pertaining to such transaction was entered into prior to the date of such amendment. (b) This Policy shall continue indefinitely after the Effective Date, unless the Compensation Committee shall decide to terminate this Policy by adopting resolutions 7

terminating this Policy; provided, however, that any such termination of the Policy shall (i) not be effective until the first anniversary after the action to terminate the Policy is taken by the Compensation Committee and (ii) not affect any payments or benefits already owed to Executive pursuant to the terms of the Policy at the time the termination of the Policy becomes effective. Miscellaneous. (a) The Company shall pay all reasonable legal fees and related expenses (including the costs of experts, evidence and counsel) incurred by Executive as a result of Executive seeking to obtain or enforce any right or benefit provided by this Policy, provided the Executive is successful on at least one material claim to obtain or enforce such rights or benefits. The reimbursement of the eligible expense must be made on or before the last day of Executive’s taxable year following Executive’s taxable year in which it was determined that such expense was incurred reimbursable. (b) This Policy shall be binding upon any successor in interest of the Company or an affiliate (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business or assets of the Company, and shall be enforceable by or on behalf of an Executive in the same manner and to the same extent as the Company is bound and as if no succession had taken place. As used in this Policy, the term “Company” shall include any successor to all or substantially all its business or assets or which becomes bound by the terms of this Policy by the terms hereof, by operation of law, or otherwise. It is intended that this Policy confer vested and nonforfeitable rights for each Executive to receive benefits to which Executive is entitled under the terms of this Policy with Executives being third party beneficiaries. (c) Except as otherwise provided herein, this Policy shall not affect any Executive's rights or entitlement to other accrued but unpaid compensation or benefits under any other employee benefit program offered to Executive by the Company or an affiliate as of the Date of Termination. (d) The various provisions of this Policy are severable and any determination of invalidity or unenforceability of any one provision shall not have any effect on the remaining provisions. (e) For the purposes of this Policy, notices and all other communications provided for in the Policy shall be in writing and shall be deemed to have been duly given when personally delivered or sent by electronic mail or certified mail, return receipt requested, postage prepaid, addressed to the respective addresses last given by each party to the other, provided that all notices to the Company shall be directed to the attention of the Chief Human Resources Officer and Corporate Secretary of the Company. All notices and communications shall be deemed to have been received on the date of delivery thereof or on the third business day after the mailing thereof, except that notice of change of address shall be effective only upon receipt. (f) Executive shall not be required to mitigate the amount of any payment provided under this Policy by seeking other employment or otherwise, nor shall the 8

amount of any payment provided under this Policy be reduced by any earnings of Executive after the Date of Termination from any subsequent employer or from any other source. (g) All payments made pursuant to this Policy shall be subject to withholding of required income and employment taxes. (h) This Policy shall be governed by and construed in accordance with the internal laws of the State of Kentucky. 9

Exhibit A “Change in Control” shall mean the occurrence of: 1) An acquisition (other than directly from the Company) of any voting securities of the Company (the “Voting Securities”) by any “Person” (as the term person is used for purposes of Section 13(d) or 14(d) of the Exchange Act), immediately after which such Person has “Beneficial Ownership” (within the meaning of Rule 13d-3 promulgated under the Exchange Act) of twenty percent (20%) or more of the combined voting power of the Company’s then outstanding Voting Securities; provided, however, in determining whether a Change in Control has occurred, Voting Securities which are acquired in a “Non-Control Acquisition” (as hereinafter defined) shall not constitute an acquisition which would cause a Change in Control. A “Non-Control Acquisition” shall mean an acquisition by (i) an employee benefit plan (or a trust forming a part thereof) maintained by (A) the Company or (B) any corporation or other Person of which a majority of its voting power or its equity securities or equity interest is owned, directly or indirectly, by the Company (for purposes of this definition, a “Subsidiary”) (ii) the Company or its Subsidiaries, or (iii) any Person in connection with a “Non-Control Transaction” (as hereinafter defined); 2) The individuals who, as of the Effective Date are members of the Board (the “Incumbent Board”), cease for any reason to constitute at least two-thirds of the members of the Board; provided, however, that if the election, or nomination for election by the Company’s common stockholders, of any new director was approved by a vote of at least two-thirds of the Incumbent Board, such new director shall, for purposes of this Policy, be considered as a member of the Incumbent Board; provided further, however, that no individual shall be considered a member of the Incumbent Board if such individual initially assumed office as a result of either an actual or threatened solicitation of proxies or consents by or on behalf of a Person other than the Board (a “Proxy Contest”) including by reason of any agreement intended to avoid or settle any Proxy Contest; or 3) The consummation of: a) A merger, consolidation or reorganization involving the Company, unless such merger, consolidation or reorganization is a “Non-Control Transaction.” A “Non-Control Transaction” shall mean a merger, consolidation or reorganization of the Company where: i) the stockholders of the Company, immediately before such merger, consolidation or reorganization, own directly or indirectly immediately following such merger, consolidation or reorganization, at least seventy-five percent (75%) of the combined voting power of the outstanding Voting Securities of the corporation resulting from such merger or consolidation or reorganization (the “Surviving Corporation”) in substantially the same proportion as their ownership of the Voting Securities immediately before such merger, consolidation or reorganization; ii) the individuals who were members of the Incumbent Board immediately prior to the execution of the agreement providing for such merger, consolidation or reorganization constitute at least two-thirds of the members of the board of directors of the Surviving 10

Corporation, or a corporation beneficially directly or indirectly owning a majority of the Voting Securities of the Surviving Corporation, and no agreement, plan or arrangement is in place to change the composition of the board of directors following the merger, consolidation or reorganization; and iii) no Person other than (i) the Company, (ii) any Subsidiary, (iii) any employee benefit plan (or any trust forming a part thereof) maintained by the Company, the Surviving Corporation, or any Subsidiary, or (iv) any Person who, immediately prior to such merger, consolidation or reorganization had Beneficial Ownership of twenty percent (20%) or more of the then outstanding Voting Securities, has Beneficial Ownership of twenty percent (20%) or more of the combined voting power of the Surviving Corporation’s then outstanding voting securities. b) A complete liquidation or dissolution of the Company; or c) The sale or other disposition of all or substantially all of the assets of the Company to any Person (other than a transfer to a Subsidiary). Notwithstanding the foregoing, a Change in Control shall not be deemed to occur solely because any Person (the “Subject Person”) acquired Beneficial Ownership of more than the permitted amount of the then outstanding Voting Securities as a result of the acquisition of Voting Securities by the Company which, by reducing the number of Voting Securities then outstanding, increases the proportional number of Shares Beneficially Owned by the Subject Persons, provided that if a Change in Control would occur (but for the operation of this sentence) as a result of the acquisition of Voting Securities by the Company, and after such share acquisition by the Company, the Subject Person becomes the Beneficial Owner of any additional Voting Securities which increases the percentage of the then outstanding Voting Securities Beneficially Owned by the Subject Person, then a Change in Control shall occur. It is the intent of the Company that, with respect to any amount payable or benefit to be provided under this Policy that is subject to, and not exempt from Section 409A, the definition of "Change in Control" satisfies, and be interpreted in a manner that satisfies, the applicable requirements of Section 409A. If the definition of "Change in Control" would otherwise frustrate or conflict with the intent expressed above, that definition to the extent possible shall be interpreted and deemed amended so as to avoid such conflict. 11

Exhibit B Restrictive Covenants Confidential Information and Trade Secrets The Executive recognizes that the Executive’s position with the Company requires considerable responsibility and trust, and, in reliance on the Executive’s loyalty, the Company may entrust the Executive with highly sensitive confidential, restricted and proprietary information involving Trade Secrets and Confidential Information. “Trade Secret” shall be defined as any scientific or technical information, design, process, procedure, formula or improvement that is valuable and not generally known to competitors of the Company. “Confidential Information” is any data or information, other than Trade Secrets, that is important, competitively sensitive, and not generally known by the public, including, but not limited to, the Company’s business plans, business prospects, training manuals, product development plans, bidding and pricing procedures, market strategies, internal performance statistics, financial data, confidential personnel information concerning employees of the Company, supplier data, operational or administrative plans, policy manuals, and terms and conditions of contracts and agreements. The terms “Trade Secrets” and “Confidential Information” shall not apply to information which is (i) already in the Executive’s possession (unless such information was used in connection with formulating the Company’s business plans, obtained by the Executive from the Company or was obtained by the Executive in the course of the Executive’s employment by the Company), or (ii) required to be disclosed by any applicable law. Except as may be required by law or legal process or an order of a court of competent jurisdiction, the Executive will not use or disclose any Trade Secrets or Confidential Information of the Company at any time after termination of employment and prior to such time as they cease to be Trade Secrets or Confidential Information through no act of the Executive in violation of this Section. Executive will surrender to the Company all memoranda, notes, records, plans, manuals or other documents pertaining to the Company’s business or the Executive’s employment (including all copies thereof). The Executive will also leave with the Company all materials involving Trade Secrets or Confidential Information of the Company. All such information and materials, whether or not made or developed by the Executive, shall be the sole and exclusive property of the Company, and the Executive hereby assigns to the Company all of the Executive’s right, title and interest in and to any and all of such information and materials. Agreement Not to Compete and Agreement Not to Solicit The Executive hereby covenants and agrees that during the Severance Period the Executive, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, stockholder, investor or principal of, or consultant or independent contractor with, another entity, shall not participate in any business which competes with the Company including, without limitation, health maintenance organizations, insurance companies or prepaid health plan businesses in which the Company has been actively engaged during any part of the two (2) year period immediately preceding the Executive’s employment Termination Date (“Company 12

Business”), in any Geographic Area (as defined below) in which the Company and/or any of its Affiliates is then doing business. For purposes of this Policy, “Geographic Area” means any state, commonwealth or territory of the United States or any equivalent entity in any foreign country. The Executive hereby covenants and agrees that during the Severance Period, the Executive, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, stockholder, investor or principal of, or consultant or independent contractor with, another entity, shall not: (1) interfere with the relationship of the Company and any of its employees, agents, representatives, consultants or advisors; (2) divert, or attempt to cause the diversion from the Company, any Company Business, nor interfere with relationships of the Company with its policyholders, agents, brokers, dealers, distributors, marketers, sources of supply or customers; or (3) solicit, recruit or otherwise induce or influence any employee of the Company to accept employment in any business which competes with the Company Business, in any Geographic Area in which the Company and/or any of its Affiliates is then doing business. 13

EX-10.F

Exhibit 10(f) HUMANA INC. EXECUTIVE SEVERANCE POLICY This Humana Inc. Executive Severance Policy has been adopted by the Organization & Compensation Committee (the “Committee”) of the Board of Directors of the Company to apply to selected executive employees of the Company. Executives will be eligible for coverage under the Policy for the payment of severance benefits upon termination of employment under certain circumstances, subject to the conditions set forth below. This Policy shall be effective as of the Effective Date as provided herein. 1. Definitions. For purposes of this Policy, the following terms shall have the following meaning: “Annual Base Salary” shall mean an Executive’s stated annual compensation without regard to any bonus, perquisite or other benefits. “Annual Bonus” means the annual bonus or incentive compensation payable to Executive under the Company’s annual bonus or incentive compensation program in which Executive participates from time to time. “Cause” means (i) a felony conviction of Executive, (ii) the failure of Executive to contest prosecution for a felony, or (iii) Executive’s willful misconduct or dishonesty, any of which is determined by the Compensation Committee to be directly and materially harmful to the business or reputation of the Company or any of its subsidiaries. “CEO” shall mean the Company’s President and Chief Executive Officer. “CEO Direct Reports” shall mean Executive Officers of the Company who are direct reports to the Company’s President and Chief Executive Officer. “Company” means Humana Inc., a Delaware corporation. “Code” means the Internal Revenue Code of 1986, as amended. “Compensation Committee” means the Organization and Compensation Committee of the Board of Directors of the Company. “Date of Termination” means the effective date of the relevant Executive’s termination of employment with the Company. “Effective Date” means March 1, 2019, or such later date as determined by the Compensation Committee with respect to an Executive. “Executive” means Executive Officers of the Company (including the CEO) and such other individuals as identified by the Compensation Committee, in each case employed by 1 | Page

the Company or an affiliate of the Company on a full-time or part-time basis. Individuals will continue to be deemed an “Executive” eligible for the rights and benefits under this Policy for a period of twelve (12) months following a change in role or title at the Company that would otherwise have caused the individual to cease to be an eligible Executive Officer or other individual identified by the Compensation Committee as eligible. “Executive Officer” shall include those executive officers designated by the Board under Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended. “Policy” means this Humana Inc. Executive Severance Policy. “Separation from Service” means a termination of the employment relationship of the Executive with the Company or an affiliate within the meaning of Section 409A of the Code and Treasury Regulation section 1.409A-1(h) or any successor thereto. “Severance Period” means (i) for the CEO, twenty-four (24) months following the Date of Termination, (ii) for CEO Direct Reports, eighteen (18) months following the Date of Termination and (iii) for all other Executives, six (6) months plus two (2) weeks per year of completed service. “Severance Rate” means (i) for the CEO, the CEO’s then current Annual Base Salary plus the target annual bonus or incentive compensation which could have been earned by the CEO, calculated as if all relevant goals had been met during the Company’s then-current fiscal year pursuant to the terms of the incentive compensation plan in which the CEO participates, and (ii) for all of Executives, such Executive’s then current Annual Base Salary. 2. Term of Policy. The term of this Policy shall begin on the Effective Date and shall continue in effect until modified or terminated by the Company pursuant to Section 13 hereof. 3. Termination. The Company may terminate the employment of Executive for any reason and at any time. In the event that the Company terminates the employment of Executive without Cause, Executive shall be entitled to the following rights and benefits under this Section 3: 3.1 Severance Benefits. Subject to Executive’s compliance with all terms of this Policy, including, without limitation, Sections 5 and 6 hereof: (i) Salary Continuation Payments. The Company will pay Executive salary continuation through the Severance Period at an annual rate equal to such Executive’s Severance Rate; provided that any payments that would otherwise be paid during the Severance Period that remain outstanding as of March 15 of the year following the year during which the Date of Termination occurred shall be paid in a lump sum on such date. Salary continuation under this Section 3.1 shall be paid on a bi-weekly basis in accordance with the Company’s customary payroll practices with the first payment to be made in accordance with Section 5 hereof, subject to the accelerated payment of the remaining amounts in accordance with the prior sentence. (ii) Pro-Rata Bonus. The Company will pay Executive an amount equal to the product of (A) the Annual Bonus, if any, that Executive would have earned for the calendar year in which the Date of Termination occurs, based on achievement of the applicable performance 2 | Page

goals for each such calendar year, as uniformly applied to other Executives who remain employed through the end of the applicable performance period and (B) a fraction, the numerator of which is the number of days Executive was employed by the Company during the calendar year of termination, and the denominator of which is the number of days in such calendar year. This amount shall be paid on the date that Annual Bonuses are normally paid, but in no event later than March 15th of the year following the year in which the Date of Termination occurs. (iii) Continued Health Benefit Coverage. The Company will provide to each Executive and Executive’s eligible dependents, through the end of the (i) applicable Severance Period for such Executive, or (ii) the effective date of Executive’s coverage under equivalent benefits from a new employer (provided that no such equivalent benefits shall be considered effective unless and until all pre-existing condition limitations and waiting period restrictions have been waived or have otherwise lapsed), at the Compensation Committee’s option, either (A) continued medical and dental coverage under the Company’s health care plan at the same level of coverage to which such Executive was entitled on the Date of Termination, subject to eligibility requirements and other conditions contained in the plan, including the requirement that Executive continue to pay the “employee portion” of the cost thereof, or (B) equivalent benefits (or equivalent cash value, payable on an after-tax basis), as determined in the sole reasonable discretion of the Compensation Committee. The coverage provided pursuant to this Section 3.1(iii) shall be in satisfaction of the Company’s obligation to provide coverage under the Consolidated Omnibus Budget Reconciliation Act (COBRA). (iv) Outplacement Services; Financial Planning. The Company will provide an Executive who is the CEO or a CEO Direct Report or otherwise designated by the Committee (i) with financial planning services during the one year period immediately following the Date of Termination on the same terms as the financial planning services were provided to such Executive immediately prior to the Date of Termination, and (ii) with outplacement services through an outplacement firm of the Company’s choosing at a level of services to be determined by the Company, with such services to extend until the earlier of (A) one year following the Date of Termination or (B) the date Executive secures full time employment. 3.2 Accrued Rights. Within fifteen (15) business days following the Date of Termination, the Company will pay or provide Executive with (i) all accrued but unpaid base salary through the Date of Termination, (ii) vacation pay accrued but not used in accordance with the Company’s vacation pay policy, (iii) any previously awarded but unpaid Annual Bonus for a completed calendar year prior to the Date of Termination, (iv) any unreimbursed business expenses that are reimbursable under the Company’s business expense policy, and (v) all rights and benefits under the employee benefit plans of the Company in which Executive is then participating, (collectively, the “Accrued Rights”). 3.3 No Additional Rights. Except as provided in this Section 3, Executive’s participation under any benefit plan, program, policy or arrangement sponsored or maintained by the Company shall be treated in accordance with the terms of the applicable plan. Without limiting the generality of the foregoing, Executive’s eligibility for and active participation in any of the retirement plans maintained by the Company will end on the Date of Termination and Executive will earn no additional benefits, including, without limitation, any additional service credit, under those plans after that date. Executive shall be treated as a terminated employee for purposes of all 3 | Page

such benefit plans and programs effective as of the Date of Termination, and shall receive all payments and benefits due under such plans and programs in accordance with the terms and conditions thereof. 4. Other Terminations. The Company may terminate the employment of Executive for any reason and at any time. In the event that the Company terminates the employment of Executive during the term of the Policy, other than a termination of employment by the Company for Cause, the Company will pay or provide Executive with all Accrued Rights. Executive may terminate his or her employment for any reason and at any time and shall not be entitled to any payments or benefits under this Policy by reason of such termination of employment from the Company. This Policy shall have no effect on the rights and benefits to which an Executive is entitled upon retirement under (without limitation) any retirement or savings plan of the Company, which shall be governed exclusively by the terms of such plans and agreements, as applicable. 5. Release. 5.1 As a condition precedent to receiving the payments and benefits as provided herein, Executive will execute (and not revoke) a general release of claims (the “Release”), in a form provided by the Company. If Executive fails to execute and deliver the Release, or revokes the Release, Executive agrees that he shall not be entitled to receive the payments and benefits described herein. For purposes of this Policy, the Release shall be considered to have been executed by Executive if it is signed by Executive’s legal representative in the case of legal incompetence or on behalf of Executive’s estate in the case of Executive’s death. 5.2 Except as otherwise specified or agreed to by Executive and the Company, payment of any amounts described hereunder that are subject to the Release will begin on the 60th day following the Date of Termination, with the first such payment to include any amounts attributable to payroll intervals occurring prior to such date, provided, however, that, to the extent that the payments are exempt from Section 409A of the Code, such exempt payments shall be made beginning with the first payroll date following the effectiveness of the Release. 6. Restrictive Covenants. In consideration of Executive’s employment by the Company and the rights and benefits of Executive provided by this Policy, Executive will enter into agreements that contain certain covenants regarding non-competition, non-solicitation, non- disparagement and specific enforcement with the restricted period for the non-competition and non-solicitation covenants to be the applicable Severance Period for such Executive, commencing upon the Date of Termination, with such covenants to be substantially in the form attached as Exhibit A hereto and effective as of the Effective Date hereof (the “Restrictive Covenants Effective Date”). 7. Section 409A. 7.1 Compliance. It is intended that this Policy be exempt from the provisions of Section 409A of the Code and this Policy shall be construed, administered, and governed in a manner consistent with this intent. If and to the extent that any payment or benefit under this Policy is determined by the Company to constitute “non-qualified deferred compensation” subject to Section 409A of the Code and is payable to Executive by reason of Executive’s termination of 4 | Page

employment, then such payment or benefit shall be made or provided to Executive only upon a Separation from Service as defined for purposes of Section 409A of the Code. Each severance payment under this Policy will be considered a “separate payment” and not one of a series of payments for purposes of Section 409A of the Code. To the extent that any benefits to be provided to Executive pursuant to this Policy are considered nonqualified deferred compensation and are reimbursements subject to Treasury Regulation Section 1.409A-3(i)(1)(iv), then (i) the reimbursement of eligible expenses related to such benefits shall be made on or before the last day of the Executive’s taxable year following the Executive’s taxable year in which the expense was incurred and (ii) notwithstanding anything to the contrary in this Policy or any plan providing for such benefits, the amount of expenses eligible for reimbursement during any taxable year of the Executive shall not affect the expenses eligible for reimbursement in any other taxable year. Nothing in this Policy will provide a basis for any person to take action against the Company or its affiliates based on matters covered by Section 409A of the Code and in no event will the Company or its affiliates be liable for any additional tax, interest or penalties that may be imposed on Executive under Section 409A of the Code or any damages for failing to comply with Section 409A of the Code. 7.2 Six Month Delay for Specified Executives. To the extent that any amount payable or benefit to be provided under this Policy constitutes a nonexempt “nonqualified deferred compensation plan” (as defined in Section 409A of the Code) upon a Separation from Service, and to the extent an Executive is deemed to be a “specified employee” (as that term is defined in Section 409A of the Code and pursuant to procedures established by the Company) on the Date of Termination, notwithstanding any other provision in this Policy to the contrary, such payment or benefit provision will not be made to the Executive during the six month period immediately following the Date of Termination. Instead, on the first day of the seventh month following the Date of Termination, all amounts that otherwise would have been paid or provided to the Executive during the six month period, but were not paid or provided because of this Section 7.2, will be paid or provided to the Executive at such time without interest. This six month delay will cease to be applicable if the Executive incurs a Separation from Service due to death or if the Executive dies before the six month period has expired. 8. Withholding Taxes. All compensation payable pursuant to this Policy shall be subject to reduction by all applicable withholding, social security and other federal, state and local taxes and deductions, and the Company shall be authorized to make all such withholdings to the extent it determines necessary under applicable law. 9. Acknowledgment. Executive acknowledges that this Policy does not constitute a contract of employment or impose on the Company any obligation to retain Executive as an employee and that this Policy does not prevent Executive from terminating employment at any time. 10. Non-Duplication of Benefits; CIC Policy. The severance benefit under this Policy is not intended to duplicate any other benefits provided by the Company in connection with the termination of an employee’s employment, such as wage replacement benefits, pay-in-lieu-of- notice, severance pay, or similar benefits under any other benefit plans, severance programs, employment contracts, or applicable federal or state laws, such as the WARN Acts. Should such other benefits be payable, the severance benefit under this Policy will be reduced accordingly or, 5 | Page

alternatively, severance benefits previously paid under this Policy will be treated as having been paid to satisfy such other benefit obligations. In either case, the Company will determine how to apply this provision and may override other provisions in this Policy in doing so. In addition, and notwithstanding anything else provided herein, to the extent Executive is entitled to severance payments and benefits upon termination of employment pursuant to the Company’s Change in Control Policy or any other change in control arrangements, this Policy will cease to apply and Executive’s entitlement to severance benefits shall be governed solely by the Change in Control Policy. 11. Administration. The Compensation Committee is responsible for the administration of this Policy and shall have all powers and duties necessary to fulfill its responsibilities. The Compensation Committee shall determine any and all questions of fact, resolve all questions of interpretation of the Policy which may arise, and exercise all other powers and discretion necessary to be exercised under the terms of the Policy which it is herein given or for which no contrary provision is made. The Compensation Committee shall have full power and discretion to interpret the Policy and related documents, to resolve ambiguities, inconsistencies and omissions, to determine any question of fact, and to determine the rights and benefits, if any, of any Executive or other employee, in accordance with the provisions of the Policy. The Compensation Committee’s decision with respect to any matter shall be final and binding on all parties concerned. The validity of any such interpretation, construction, decision, or finding of fact shall not be given de novo review if challenged in court, by arbitration, or in any other forum, and shall be upheld unless clearly arbitrary or capricious. The Compensation Committee may, from time to time, by action of its appropriate officers, delegate to designated persons or entities the right to exercise any of its powers or the obligation to carry out its duties under the Policy. 12. Amendment and Termination. The Company reserves the right to amend or terminate this Policy at any time and in any manner, without consent or advance notice to Executives or other employees. No amendment or termination of the Policy shall affect the rights of an Executive whose Date of Termination has occurred prior to the date of such amendment or termination of the Policy and who remains entitled to severance payments or benefits under this Policy. 6 | Page

Exhibit A Restrictive Covenants Confidential Information and Trade Secrets The Executive recognizes that the Executive’s position with the Company requires considerable responsibility and trust, and, in reliance on the Executive’s loyalty, the Company may entrust the Executive with highly sensitive confidential, restricted and proprietary information involving Trade Secrets and Confidential Information. “Trade Secret” shall be defined as any scientific or technical information, design, process, procedure, formula or improvement that is valuable and not generally known to competitors of the Company. “Confidential Information” is any data or information, other than Trade Secrets, that is important, competitively sensitive, and not generally known by the public, including, but not limited to, the Company’s business plans, business prospects, training manuals, product development plans, bidding and pricing procedures, market strategies, internal performance statistics, financial data, confidential personnel information concerning employees of the Company, supplier data, operational or administrative plans, policy manuals, and terms and conditions of contracts and agreements. The terms “Trade Secrets” and “Confidential Information” shall not apply to information which is (i) already in the Executive’s possession (unless such information was used in connection with formulating the Company’s business plans, obtained by the Executive from the Company or was obtained by the Executive in the course of the Executive’s employment by the Company), or (ii) required to be disclosed by any applicable law. Except as may be required by law or legal process or an order of a court of competent jurisdiction, the Executive will not use or disclose any Trade Secrets or Confidential Information of the Company at any time after termination of employment and prior to such time as they cease to be Trade Secrets or Confidential Information through no act of the Executive in violation of this Section. Upon termination of employment, Executive will surrender to the Company all memoranda, notes, records, plans, manuals or other documents pertaining to the Company’s business or the Executive’s employment (including all copies thereof). The Executive will also leave with the Company all materials involving Trade Secrets or Confidential Information of the Company. All such information and materials, whether or not made or developed by the Executive, shall be the sole and exclusive property of the Company, and the Executive hereby assigns to the Company all of the Executive’s right, title and interest in and to any and all of such information and materials. Agreement Not to Compete and Agreement Not to Solicit The Executive hereby covenants and agrees that, for a period commencing on the Restrictive Covenants Effective Date and ending at the conclusion of the applicable Severance Period (as defined in the Humana Inc. Executive Severance Policy (the “Policy”)), the Executive, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, stockholder, investor or principal of, or consultant or independent contractor with, another entity, shall not participate in any business which competes with the Company including, without limitation, health maintenance organizations, insurance companies or prepaid health plan businesses in which the 7 | Page

Company has been actively engaged during any part of the two (2) year period immediately preceding the Date of Termination (as defined in the Policy) (“Company Business”), in any Geographic Area (as defined below) in which the Company and/or any of its Affiliates is then doing business. For purposes of this Policy, “Geographic Area” means any state, commonwealth or territory of the United States or any equivalent entity in any foreign country. The Executive hereby covenants and agrees that, for a period commencing on the Restrictive Covenants Effective Date and ending at the conclusion of the applicable Severance Period, the Executive, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, stockholder, investor or principal of, or consultant or independent contractor with, another entity, shall not: (1) interfere with the relationship of the Company and any of its employees, agents, representatives, consultants or advisors; (2) divert, or attempt to cause the diversion from the Company, any Company Business, nor interfere with relationships of the Company with its policyholders, agents, brokers, dealers, distributors, marketers, sources of supply or customers; or (3) solicit, recruit or otherwise induce or influence any employee of the Company to accept employment in any business which competes with the Company Business, in any Geographic Area in which the Company and/or any of its Affiliates is then doing business. 8 | Page

EX-10.FF

Exhibit 10(ff) HUMANA INC. RESTRICTED STOCK UNIT AGREEMENT AND AGREEMENT NOT TO COMPETE OR SOLICIT UNDER THE 2011 STOCK INCENTIVE PLAN THIS RESTRICTED STOCK UNIT AGREEMENT ("Agreement") made as of <award_date> (the “Date of Grant”) by and between HUMANA INC., a corporation duly organized and existing under the laws of the State of Delaware (hereinafter referred to as the "Company"), and <first_name> <middle_name> <last_name>, an employee of the Company (hereinafter referred to as "Grantee"). WITNESSETH: WHEREAS, the Humana Inc. 2011 Stock Incentive Plan (the "Plan") was approved by the Company's Board of Directors and stockholders; and WHEREAS, the Company desires to award to Grantee Restricted Stock Units in accordance with the Plan. NOW, THEREFORE, in consideration of the award of Restricted Stock Units to Grantee, the promises and mutual covenants hereinafter set forth, and other good and valuable consideration, the Company and Grantee agree as follows: I. RESTRICTED STOCK UNIT GRANT A. Grant. Subject to the terms and conditions hereinafter set forth, and in accordance with the provisions of the Plan, the Company hereby grants to Grantee, and Grantee hereby accepts from the Company <shares_awarded> Restricted Stock Units. Each Restricted Stock Unit represents the right of Grantee to receive (i) one (1) Share on the date of distribution provided for in Section I.E. In addition, Grantee shall also have the right to receive all of the cash or in-kind dividends that are paid with respect to the Shares represented by the Restricted Stock Units to which this award relates (“DERs”). Dividend equivalents with respect to any such Share shall be paid on the same date that such Share is issued to Grantee pursuant to Section I.E. hereof. The DERs shall be subject to the same terms and conditions applicable to the Restricted Stock Units, including, without limitation, the restrictions and non-transferability, vesting, forfeiture and distribution provisions contained in Sections I.B through I.E., inclusive, of this Agreement. In the event that the Restricted Stock Units are forfeited pursuant to Section I.D. hereof, the related DER shall also be forfeited. B. Restrictions and Non-Transferability. The Restricted Stock Units and DERs may not be sold, transferred, pledged, assigned or otherwise alienated or hypothecated. In addition, such Restricted Stock Units and DERs shall be subject to forfeiture in accordance with the provisions of Section I.D. C. Vesting of Restricted Stock Units. The Restricted Stock Units shall vest in three equal installments, with the first installment vesting on [December 15] of the year in which the Date of Grant occurs, and the next two installments vesting on [December 15] of each of the next two years (each such date, a “Vesting Date” and the period between each Vesting Date or between the Date of Grant and a - 1 - RSU – NCNS - RE

Vesting Date, as applicable, a “Vesting Period”) subject to Grantee’s continued employment with the Company through each such Vesting Date; provided, that, notwithstanding the foregoing, upon certain terminations (as set forth below), all or a portion of the unvested Restricted Stock Units and DERs will vest as follows: 1. Upon a termination of Grantee’s employment with the Company due to Grantee’s death or Disability, all of the unvested Restricted Stock Units and DERs will immediately vest; 2. In the event of a Change in Control Termination, all of the unvested Restricted Stock Units and DERs will immediately vest; 3. Upon the termination of Grantee’s employment due to Retirement, a prorated portion of the Restricted Stock Units (and related DERs) that would have vested on the next scheduled Vesting Date shall vest on the next scheduled Vesting Date, with the proration to be determined by calculating the product of (i) the quotient of (x) the number of completed months Grantee has been employed since the Date of Grant or the most recent Vesting Date, as applicable, divided by (y) the number of months in the current restricted Vesting Period, multiplied by (ii) the total number of Restricted Stock Units that were scheduled to vest on the next scheduled Vesting Date. For purposes of the foregoing calculation, a month is complete on the day in the following month that corresponds to the Date of Grant; 4. [In the event that Grantee’s employment with the Company terminates due to a Divestiture of the business to which Grantee provides services and (i) the Company maintains a strategic interest in the divested business, as determined by the Committee in its sole discretion, all outstanding Restricted Stock Units (and related DERs) shall continue to vest on the regular Vesting Dates in the same manner as if Grantee continued to be employed by the Company through the applicable Vesting Dates; provided that the Grantee must remain employed by the divested business on each of the applicable Vesting Dates. For the avoidance of doubt, if the Grantee’s employment with the aforementioned divested business terminates before a Vesting Date, the Grantee’s unvested Restricted Stock Units will no longer vest pursuant to this Section I.C.4 and will be forfeited upon such termination; or (ii) the Company does not maintain a strategic interest in the divested business, as determined by the Committee in its sole discretion, the portion of the unvested Restricted Stock Units (and related DERs) that would ordinarily vest within twelve (12) months of the termination of employment due to a Divestiture shall continue to vest and become vested on regular Vesting Date(s) as if Grantee had remained employed by the Company through such dates]1; 5. [In the event that Grantee’s employment with the Company terminates due to a Workforce Reduction or a Position Elimination, the portion of the unvested Restricted Stock Units (and related DERs) that would ordinarily vest within twelve (12) months of the termination of employment due to a Workforce Reduction or a Position Elimination shall continue to vest and become vested on regular Vesting Date(s) as if Grantee had remained employed by the Company through such Vesting Dates; and]2 1 NTD: Applicable for annual awards. Remove for new hires. 2 NTD: Applicable for annual awards. Remove for new hires. - 2 -

6. In the event that Grantee’s employment with the Company terminates due to a transfer to a Strategic Joint Venture, [due to a Divestiture of the business to which Grantee provides services, or due to a Workforce Reduction or a Position Elimination,]3 all outstanding Restricted Stock Units (and related DERs) shall continue to vest on the regular Vesting Date(s) in the same manner as if Grantee continued to be employed by the Company through the applicable Vesting Date(s)[; provided that, in the case of a termination due to a Divestiture of the business, if the Company maintains a strategic interest in the divested business, as determined by the Committee in its sole discretion, the Grantee must remain employed by the divested business on each of the applicable Vesting Dates. For the avoidance of doubt, if the Grantee’s employment with the aforementioned divested business terminates prior to a Vesting Date, the Grantee’s unvested Restricted Stock Units will no longer vest pursuant to this Section I.C.6 and will be forfeited upon such termination.]4 D. Forfeiture. Except as set forth in Section I.C, upon the termination of Grantee's employment with the Company prior to the time the Restricted Stock Units and DERs have vested, the Restricted Stock Units and DERs shall be forfeited immediately by Grantee. E. Distributions. The Company shall issue to Grantee (or, if applicable, Grantee’s estate or personal representative) Shares (or such other securities or other property into which the Shares have been converted, with any partial Shares or other securities to be settled in cash) with respect to Grantee’s Restricted Stock Units and dividend equivalents accrued pursuant to the DERs with respect to such Restricted Stock Units, within 30 days of the date that the Restricted Stock Units vest in accordance with Section I.C hereof; provided, however, that, to the extent that the Restricted Stock Units are considered deferred compensation subject to Section 409A of the Code and the Restricted Stock Units vest in connection with Grantee’s Change in Control Termination, then unless the Change in Control is a Section 409A Change in Control, the distribution of Shares (or such other securities or other property into which the Shares have been converted) shall not be accelerated to the vesting date but such distribution shall instead occur based on the Vesting Dates set forth in Section I.C. hereof. A “Section 409A Change in Control” shall mean a Change in Control that also constitutes a “change in ownership or effective control” of the Company or a “change in ownership of a substantial portion of the assets of” the Company, in each case within the meaning of Section 409A of the Code. Notwithstanding anything to the contrary contained herein, no Shares may be transferred to any person other than Grantee unless such other person demonstrates to the reasonable satisfaction of the Company such person’s right to the transfer. F. Taxes. Federal, state and local income and employment taxes and other amounts as may be required by law to be collected by the Company (“Withholding Taxes”) in connection with the distribution of Shares, cash or other property or, to the extent applicable, vesting of the Restricted Stock Units or DERs hereunder, shall be paid by Grantee at such time. Notwithstanding the foregoing, the 3 NTD: Applicable for new hires. Remove for annual awards. 4 NTD: Applicable for new hires. Remove for annual awards. - 3 -

Company shall withhold delivery of a number of Shares with a Fair Market Value as of the distribution date equal to the Withholding Taxes required to be withheld in connection with such distribution. II. AGREEMENT NOT TO COMPETE AND AGREEMENT NOT TO SOLICIT. Grantee agrees and understands that the Company’s business is a profit-generating business operating in a highly competitive business environment and that the Company has a legitimate business interest in, among other things, its confidential information and trade secrets (including as protected in other agreements and policies between the Company and Grantee) that it is providing Grantee, and in the significant time, money, training, team building and other efforts it expends to develop Grantee’s skills to assist in performing Grantee’s duties for the Company, including with respect to establishing, developing and maintaining the goodwill and business relationships with Protected Relationships (defined below) and employees, each of which Grantee agrees are valuable assets of the Company to which it has devoted substantial resources. Grantee acknowledges that the grant Grantee is receiving under the Plan is a meaningful way that the Company entrusts Grantee with its goodwill and aligns Grantee with the Company objective of increasing the value of the Company’s business. Accordingly, Grantee acknowledges the importance of protecting the value of the Company’s business through, among other things, covenants to restrict Grantee from engaging in activities that would adversely affect the value of the Company and its goodwill. A. Agreement Not to Compete. Grantee agrees that during the Restricted Period (defined below) and within the Restricted Geographic Area (defined below), Grantee will not, directly or indirectly, perform the same or similar responsibilities Grantee performed for the Company in connection with a Competitive Product or Service (defined below). Notwithstanding the foregoing, Grantee may accept employment with a Competitor (defined below) whose business is diversified, provided that: (1) Grantee will not be engaged in working on or providing Competitive Products or Services, or otherwise use or disclose the Company’s confidential information or trade secrets; and (2) the Company receives written assurances from the Competitor and Grantee that are satisfactory to the Company that Grantee will not work on or provide Competitive Products or Services, or otherwise use or disclose confidential information or trade secrets. In addition, nothing in this Agreement is intended to prevent Grantee from investing Grantee’s funds in securities of a person engaged in a business that is directly competitive with the Company if the securities of such a person are listed for trading on a registered securities exchange or actively traded in an over-the-counter market and Grantee’s holdings represent less than one percent (1%) of the total number of outstanding shares or principal amount of the securities of such a person. B. Agreement Not to Solicit Protected Relationships. During the Restricted Period and in connection with a Competitive Product or Service, Grantee shall not, individually or jointly with others, directly or indirectly: (1) solicit or attempt to solicit any Protected Relationships (defined below); or (2) induce or encourage any Protected Relationships to terminate a relationship with the Company or to otherwise cease to accept services or products from the Company. - 4 -

C. Agreement Not to Solicit Employees. During the Restricted Period, Grantee shall not, individually or jointly with others, directly or indirectly: (1) or by assisting others, solicit, recruit, hire, or encourage (or attempt to solicit, recruit, hire or encourage), any Company employees or former employees with whom Grantee worked, had business contact, or about whom Grantee gained non-public or confidential information (“Employees or Former Employees”); (2) contact or communicate with Employees or Former Employees for the purpose of inducing, assisting, encouraging and/or facilitating them to terminate their employment with the Company or find employment or work with another person or entity; (3) provide or pass along to any person or entity the name, contact and/or background information about any Employees or Former Employees or provide references or any other information about them; (4) provide or pass along to Employees or Former Employees any information regarding potential jobs or entities or persons to work for, including but not limited to job openings, job postings, or the names or contact information of individuals or companies hiring people or accepting job applications; and/or (5) offer employment or work to any Employees or Former Employees. For purposes of this covenant, “Former Employees” shall refer to employees who are not employed by the Company at the time of the attempted recruiting or hiring, but were employed by, or working for the Company in the three (3) months prior to the time of the attempted recruiting or hiring and/or interference. D. Effect of Termination of Employment other than a Change in Control Termination on Agreements Not to Compete and Not to Solicit. 1. In the event Grantee voluntarily resigns or is discharged by the Company with Cause at any time prior to the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth in Sections II.A, II.B and II.C. shall remain in full force and effect. 2. In the event Grantee is discharged by the Company other than with Cause, including in connection with a Workforce Reduction or Position Elimination, or certain divestiture related terminations, prior to the vesting of the Restricted Stock Unit, the prohibitions set forth in Section II.A shall remain in full force and effect during the period of time following Grantee’s termination equal to the lesser of (x) the Restricted Period or (y) the period of time during which Grantee is deemed to be entitled to severance measured by the sum of (i) the number of weeks Grantee is entitled to severance under the Company’s applicable severance policy, plus (ii) a number of weeks equal to (A) the value of the acceleration or continuation of the vesting of the Restricted Stock Unit as a result of Grantee’s termination under this Agreement or the Plan that would otherwise have been forfeited, with such value measured by multiplying the number of Shares underlying the Restricted Stock Units that vested as a result of the termination of employment by the per Share Fair Market Value on the Last Day, divided by (B) Grantee’s then-current weekly base salary, plus (iii) any additional period that the Company determines to provide severance to Grantee, in its discretion. 3. In the event Grantee is discharged by the Company other than with Cause prior to vesting herein of the Restricted Stock Units, the prohibitions set forth in Sections II.B and II. C above shall remain in full force and effect. - 5 -

4. After the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth herein shall remain in full force and effect, except as otherwise provided in Section II.E. E. Effect of a Change in Control Termination on Agreements Not to Compete and Not to Solicit. 1. Notwithstanding anything set forth in Section II.D, in the event of a Change in Control Termination, the prohibitions on Grantee set forth in Section II.A shall remain in full force and effect only if the acquirer or successor to the Company following the Change in Control shall, solely at its option, pay, within thirty (30) days following Grantee's employment termination date with the Company or its successor, to Grantee the Non-Compete Payment. Notwithstanding any previous agreement between Grantee and the Company relating to the prohibitions on Grantee set forth in Section II.A, the “Non-Compete Payment” shall be an amount at least equal to Grantee’s then current annual base salary. Such amount shall be in addition to any other amounts paid or payable to Grantee with respect to other severance plans or policies maintained by the Company. For the avoidance of doubt, the provisions of this Section II.E shall supersede any agreement between Grantee and the Company relating to the prohibitions on Grantee set forth in Section II.A, with the exception of any similar agreement contained in (i) any employment agreement between Grantee and the Company, (ii) any agreement between Grantee and the Company not related to the employment of Grantee by the Company, (iii) any severance plan or policy of the Company and (iv) any change in control severance plan or policy of the Company. 2. In the event of a Change in Control Termination, the prohibitions on Grantee set forth in Sections II.B. and II C. shall remain in full force and effect. F. Governing Law. Notwithstanding any other provision herein to the contrary, the provisions of this Section II of the Agreement shall be governed by, and construed in accordance with, the laws of the Commonwealth of Kentucky without regard to its conflicts or choice of laws rules or principles that might otherwise refer construction or interpretation of this Section II to the substantive law of another jurisdiction. G. Injunctive Relief; Invalidity of Any Provision. Grantee acknowledges that (1) his or her services to the Company are of a special, unique and extraordinary character, (2) his or her position with the Company will place him or her in a position of confidence and trust with respect to the operations of the Company, (3) he or she will benefit from continued employment with the Company, (4) the nature and periods of restrictions imposed by the covenants contained in this Section II are fair, reasonable and necessary to protect the Company, (5) the Company would sustain immediate and irreparable loss and damage if Grantee were to breach any of such covenants, and (6) the Company’s remedy at law for such a breach will be inadequate. Accordingly, Grantee agrees and consents that the Company, in addition to the recovery of damages and all other remedies available to it, at law or in equity, shall be entitled to seek both preliminary and permanent injunctions to prevent and/or halt a breach or threatened breach by Grantee of any covenant contained in Section II hereof. If any provision of this Section II is determined by a court of competent jurisdiction to be invalid in whole or in part, it shall be deemed to have been amended, whether as to time, area covered or otherwise, as and to the extent required for its validity under applicable law, and - 6 -

as so amended, shall be enforceable. The parties further agree to execute all documents necessary to evidence such amendment. III. MISCELLANEOUS PROVISIONS A. Binding Effect & Adjustment. This Agreement shall be binding and conclusive upon each successor and assign of the Company. Grantee’s obligations hereunder shall not be assignable to any other person or entity. It is the intent of the parties to this Agreement that the benefits of any appreciation of the underlying Shares during the term of the Award shall be preserved in any event, including but not limited to a recapitalization, merger, consolidation, reorganization, stock dividend, stock split, reverse stock split, spin-off or similar transaction, or other change in corporate structure affecting the Shares, as more fully described in Sections 4.6 and 11 of the Plan. All obligations imposed upon Grantee and all rights granted to Grantee and to the Company shall be binding upon Grantee's heirs and legal representatives. B. Amendment. This Agreement may only be amended by a writing executed by each of the parties hereto. C. Governing Law. Except as to matters of federal law and the provisions of Section II hereof, this Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware without regard to its conflict of laws rules. This Agreement shall also be governed by, and construed in accordance with, the terms of the Plan. D. No Employment Agreement. Nothing herein confers on Grantee any rights with respect to the continuance of employment or other service with the Company, nor will it interfere with any right the Company would otherwise have to terminate or modify the terms of Grantee's employment or other service at any time. E. Severability. If any provision of this Agreement is or becomes or is deemed invalid, illegal or unenforceable in any relevant jurisdiction, or would disqualify this Award under any law deemed applicable by the Committee, such provision shall be construed or deemed amended to conform to applicable laws or if it cannot be construed or deemed amended without, in the determination of the Committee, materially altering the intent of the Plan, it shall be stricken and the remainder of the Agreement shall remain in full force and effect. F. Defined Terms. 1. Any term used herein and not otherwise defined herein shall have the same meaning as in the Plan. Any conflict between this Agreement and the Plan will be resolved in favor of the Plan. Any disputes or questions of right or obligation which shall result from or relate to any interpretation of this Agreement shall be determined by the Committee. Any such determination shall be binding and conclusive upon Grantee and any person or persons claiming through Grantee as to any rights hereunder. 2. For the purposes of this Agreement, the following terms shall have the following meaning: (i) “Change in Control Termination” means, in the event unvested Restricted Stock Units and DERs are assumed, converted, continued or substituted in connection with a Change in - 7 -

Control, if the employment of Grantee is terminated within two (2) years following the Change in Control (i) by the Company or its acquirer or successor for any reason other than Cause or (ii) by Grantee with Good Reason. (ii) “Competitive Product or Service” means any product, process, system or service (in existence or under development) of any person or organization other than the Company that is the same as, similar to, or competes with, a product, process, system or service (in existence or under development) upon which Grantee worked or for which Grantee had responsibilities at the Company during the twenty-four (24) months prior to the Last Day (as defined below). (iii) “Competitor” means Grantee or any other person or organization engaged in, or about to become engaged in, research or development, production, marketing, leasing, selling, or servicing of a Competitive Product or Service. (iv) “Divestiture” means the sale or other transfer of equity securities of a Subsidiary to a person or entity other than the Company or an affiliate of the Company, or if a Subsidiary leases, exchanges or transfers all or any portion of its assets to such a person or entity, then the Committee may specify that such transaction or event constitutes a “Divestiture”. (v) “Good Reason” shall mean, unless otherwise defined in a written employment agreement in effect between the Company or any of its Subsidiaries and Grantee, the relocation of Grantee’s office at which Grantee is to perform his or her duties to a location more than thirty (30) miles from the location at which Grantee performed his or her duties prior to a Change in Control. (vi) “Last Day” means Grantee’s last day of employment with the Company regardless of the reason for Grantee’s separation. (vii) “Position Elimination” means the elimination of Grantee’s position. (viii) “Protected Relationship” means policyholders, agents, brokers, dealers, distributers, sources of supply or customers with whom, within twenty-four (24) months prior to the Last Day, Grantee, directly or indirectly (e.g., through employees whom Grantee supervised) had material business contact and/or about whom Grantee obtained confidential information and trade secrets. (ix) “Restricted Geographic Area” means the territory (i.e.: (i) state(s), (ii) county(ies), or (iii) city(ies)) in which, during the twenty-four (24) months prior to the Last Day, Grantee provided material services on behalf of the Company (or in which Grantee supervised directly, indirectly, in whole or in part, the servicing activities). (x) “Restricted Period” means the period of Grantee’s employment with the Company and a period of twelve (12) months after the Last Day. Grantee recognizes that the durational term is reasonably and narrowly tailored to the Company’s legitimate business interest and need for protection with each position. - 8 -

(xi) “Strategic Joint Venture” means a business arrangement entered into by the Company with one or more other parties to own and operate an entity in which the Company continues to have a strategic interest. (xii) “Workforce Reduction” means a reduction in force, as determined by the Company in accordance with its standard coding procedures. G. Execution. If Grantee shall fail to execute this Agreement, either manually with a paper document, or through the online grant agreement procedure with the Company’s designated broker–dealer, and, if manually executed, return the executed original to the Secretary of the Company, the Award shall be null and void. The choice of form will be at the Company’s discretion. H. Section 409A. All Restricted Stock Units granted pursuant to this Agreement are intended either to be exempt from Section 409A of the Code, or, if subject to Section 409A of the Code, to be administered, operated and construed in compliance with Section 409A of the Code and any guidance issued thereunder. This Agreement and the Plan shall be administered in a manner consistent with this intent and any provision that would cause the Agreement or Plan to fail to satisfy the first sentence of this section shall have no force and effect. Notwithstanding anything contained herein to the contrary, Restricted Stock Units (and related DERs) that (a) constitute “nonqualified deferred compensation” as defined under Section 409A of the Code and (b) vest as a consequence of Grantee’s termination of employment, shall not be delivered until the date that Grantee incurs a “separation from service” within the meaning of Section 409A of the Code (or, if Grantee is a “specified employee” within the meaning of Section 409A of the Code and any guidance issued thereunder, the date that is six months and one day following the date of such “separation from service” (or on the date of Grantee’s death, if earlier)). In addition, each amount to be paid or benefit to be provided to Grantee pursuant to this Agreement that constitutes deferred compensation subject to Section 409A of the Code, shall be construed as a separate identified payment for purposes of Section 409A of the Code. - 9 -

IN WITNESS WHEREOF, Company has caused this Agreement to be executed on its behalf by its duly authorized officer, and Grantee has executed this Agreement, each as of the day first above written. "Company" ATTEST: HUMANA INC. BY: BY: JOSEPH C. VENTURA BRUCE D. BROUSSARD Chief Legal Officer & Corporate Secretary President & Chief Executive Officer “Grantee” <first_name> <middle_name> <last_name> - 10 -

EX-10.GG

Exhibit 10(gg) HUMANA INC. RESTRICTED STOCK UNIT AGREEMENT WITH PERFORMANCE VESTING AND AGREEMENT NOT TO COMPETE OR SOLICIT UNDER THE 2011 STOCK INCENTIVE PLAN THIS RESTRICTED STOCK UNIT AGREEMENT ("Agreement") made as of <award_date> (the “Date of Grant”) by and between HUMANA INC., a corporation duly organized and existing under the laws of the State of Delaware (hereinafter referred to as the "Company"), and <first_name> <middle_name> <last_name>, an employee of the Company (hereinafter referred to as "Grantee"). WITNESSETH: WHEREAS, the Humana Inc. 2011 Stock Incentive Plan (the "Plan") was approved by the Company's Board of Directors and stockholders; and WHEREAS, the Company desires to award to Grantee Restricted Stock Units in accordance with the Plan. NOW, THEREFORE, in consideration of the award of Restricted Stock Units to Grantee, the promises and mutual covenants hereinafter set forth, and other good and valuable consideration, the Company and Grantee agree as follows: I. RESTRICTED STOCK UNIT GRANT A. Grant. Subject to the terms and conditions hereinafter set forth, and in accordance with the provisions of the Plan, the Company hereby grants to Grantee, and Grantee hereby accepts from the Company <shares_awarded> Performance-Based Restricted Stock Units (the “Restricted Stock Units”) (which represents the target amount of shares available as set out on Appendix A). Each Restricted Stock Unit represents the right of Grantee to receive (i) one (1) Share on the date of distribution provided for in Section I.E. In addition, Grantee shall also have the right to receive all of the cash or in-kind dividends that are paid with respect to the Shares represented by the Restricted Stock Units to which this award relates (“DERs”). Dividend equivalents with respect to any such Share shall be paid on the same date that such Share is issued to Grantee pursuant to Section I.E. hereof. The DERs shall be subject to the same terms and conditions applicable to the Restricted Stock Units, including, without limitation, the restrictions and non-transferability, vesting, forfeiture and distribution provisions contained in Sections I.B through I.E., inclusive, of this Agreement. In the event that the Restricted Stock Units are forfeited pursuant to Section I.D. hereof, the related DER shall also be forfeited. B. Restrictions and Non-Transferability. The Restricted Stock Units and DERs may not be sold, transferred, pledged, assigned or otherwise alienated or hypothecated. In addition, such Restricted Stock Units and DERs shall be subject to forfeiture in accordance with the provisions of Section I.D. C. Vesting of Shares. Subject to the terms set forth below, if as of the third anniversary of the Date of Grant (the “Vesting Date” and the period between the Date of Grant and the Vesting Date, a “Vesting Period”), Grantee and the Company have achieved the performance goals to be set forth in PSU – NCNS - RE

Appendix A, the Restricted Stock Units and related DERs shall vest to the extent such performance goals have been achieved. Effective on the Vesting Date, any portion of the Restricted Stock Units and the related DERs for which the performance goals set forth in Appendix A have not been satisfied shall be immediately forfeited; provided, however, notwithstanding the foregoing, upon certain terminations of employment (as set forth below), all or a portion of the unvested Restricted Stock Units and DERs will vest as follows: 1. Upon a termination of Grantee’s employment with the Company due to Grantee’s death or Disability, all of the unvested Restricted Stock Units and DERs will immediately vest at target level; 2. In the event of a Change in Control Termination, all of the unvested Restricted Stock Units and DERs will immediately vest at target levels; 3. Upon the termination of Grantee’s employment due to Retirement, [Position Elimination, Workforce Reduction]1 or a Divestiture of the business to which Grantee provides services if the Company does not maintain a strategic interest in the divested business, as determined by the Committee in its sole discretion, a prorated portion of the Restricted Stock Units (and related DERs) that would have vested on the next scheduled Vesting Date shall vest on the next scheduled Vesting Date, with the proration to be determined by calculating the product of (A) the quotient of (x) the number of completed months Grantee has been employed since the Date of Grant, divided by (y) the number of months in the current restricted Vesting Period, multiplied by (B) the total number of Restricted Stock Units that would have vested on the next scheduled Vesting Date (taking into account achievement of applicable performance goals). For purposes of the foregoing calculation, a month is complete on the day in the following month that corresponds to the Date of Grant; or 5. Upon the termination of Grantee’s employment due to [Position Elimination, Workforce Reduction]2 or a Divestiture of the business to which Grantee provides services if the Company maintains a strategic interest in the divested business, as determined by the Committee in its sole discretion, or due to a transfer to a Strategic Joint Venture, Grantee shall continue to vest in the Restricted Stock Units (and related DERs) as if Grantee remained employed through the applicable Vesting Date (taking into account achievement of applicable performance goals); provided that, in the case of a termination due to a Divestiture of the business, the Grantee must remain employed by the divested business on the applicable Vesting Dates. For the avoidance of doubt, if the Grantee’s employment with the aforementioned divested business terminates prior to a Vesting Date, the Grantee’s unvested Restricted Stock Units will no longer vest pursuant to this Section I.C.5 and will be forfeited upon such termination. D. Forfeiture. Except as set forth in Section I.C, upon the termination of Grantee's employment with the Company prior to the time the Restricted Stock Units and DERs have vested, the Restricted Stock Units and DERs shall be forfeited immediately by Grantee. 1 NTD: Applicable for annual awards. Remove for new hires. 2 NTD: Applicable for new hires. Remove for annual awards. - 2 -

E. Distributions. The Company shall issue to Grantee (or, if applicable, Grantee’s estate or personal representative) Shares (or such other securities or other property into which the Shares have been converted, with any partial Shares or other securities to be settled in cash) with respect to Grantee’s Restricted Stock Units and dividend equivalents accrued pursuant to the DERs with respect to such Restricted Stock Units, within 30 days of the date that the Restricted Stock Units vest in accordance with Section I.C hereof; provided, however, that, to the extent that the Restricted Stock Units are considered deferred compensation subject to Section 409A of the Code and the Restricted Stock Units vest in connection with Grantee’s Change in Control Termination (defined below), then unless the Change in Control is a Section 409A Change in Control, the distribution of Shares (or such other securities or other property into which the Shares have been converted) shall not be accelerated to the vesting date but such distribution shall instead occur based on the Vesting Dates set forth in Section I.C. hereof. A “Section 409A Change in Control” shall mean a Change in Control that also constitutes a “change in ownership or effective control” of the Company or a “change in ownership of a substantial portion of the assets of” the Company, in each case within the meaning of Section 409A of the Code. Notwithstanding anything to the contrary contained herein, no Shares may be transferred to any person other than Grantee unless such other person demonstrates to the reasonable satisfaction of the Company such person’s right to the transfer. F. Taxes. Federal, state and local income and employment taxes and other amounts as may be required by law to be collected by the Company (“Withholding Taxes”) in connection with the distribution of Shares, cash or other property or, to the extent applicable, vesting of the Restricted Stock Units or DERs hereunder, shall be paid by Grantee at such time. Notwithstanding the foregoing, the Company shall withhold delivery of a number of Shares with a Fair Market Value as of the distribution date equal to the Withholding Taxes required to be withheld in connection with such distribution. II. AGREEMENT NOT TO COMPETE AND AGREEMENT NOT TO SOLICIT. Grantee agrees and understands that the Company’s business is a profit-generating business operating in a highly competitive business environment and that the Company has a legitimate business interest in, among other things, its confidential information and trade secrets (including as protected in other agreements and policies between the Company and Grantee) that it is providing Grantee, and in the significant time, money, training, team building and other efforts it expends to develop Grantee’s skills to assist in performing Grantee’s duties for the Company, including with respect to establishing, developing and maintaining the goodwill and business relationships with Protected Relationships (defined below) and employees, each of which Grantee agrees are valuable assets of the Company to which it has devoted substantial resources. Grantee acknowledges that the grant Grantee is receiving under the Plan is a meaningful way that the Company entrusts Grantee with its goodwill and aligns Grantee with the Company objective of increasing the value of the Company’s business. Accordingly, Grantee acknowledges the importance of protecting the value of the Company’s business through, among other things, covenants to - 3 -

restrict Grantee from engaging in activities that would adversely affect the value of the Company and its goodwill. A. Agreement Not to Compete. Grantee agrees that during the Restricted Period (defined below) and within the Restricted Geographic Area (defined below), Grantee will not, directly or indirectly, perform the same or similar responsibilities Grantee performed for the Company in connection with a Competitive Product or Service (defined below). Notwithstanding the foregoing, Grantee may accept employment with a Competitor (defined below) whose business is diversified, provided that: (1) Grantee will not be engaged in working on or providing Competitive Products or Services, or otherwise use or disclose the Company’s confidential information or trade secrets; and (2) the Company receives written assurances from the Competitor and Grantee that are satisfactory to the Company that Grantee will not work on or provide Competitive Products or Services, or otherwise use or disclose confidential information or trade secrets. In addition, nothing in this Agreement is intended to prevent Grantee from investing Grantee’s funds in securities of a person engaged in a business that is directly competitive with the Company if the securities of such a person are listed for trading on a registered securities exchange or actively traded in an over-the-counter market and Grantee’s holdings represent less than one percent (1%) of the total number of outstanding shares or principal amount of the securities of such a person. B. Agreement Not to Solicit Protected Relationships. During the Restricted Period and in connection with a Competitive Product or Service, Grantee shall not, individually or jointly with others, directly or indirectly: (1) solicit or attempt to solicit any Protected Relationships (defined below); or (2) induce or encourage any Protected Relationships to terminate a relationship with the Company or to otherwise cease to accept services or products from the Company. C. Agreement Not to Solicit Employees. During the Restricted Period, Grantee shall not, individually or jointly with others, directly or indirectly: (1) or by assisting others, solicit, recruit, hire, or encourage (or attempt to solicit, recruit, hire or encourage), any Company employees or former employees with whom Grantee worked, had business contact, or about whom Grantee gained non-public or confidential information (“Employees or Former Employees”); (2) contact or communicate with Employees or Former Employees for the purpose of inducing, assisting, encouraging and/or facilitating them to terminate their employment with the Company or find employment or work with another person or entity; (3) provide or pass along to any person or entity the name, contact and/or background information about any Employees or Former Employees or provide references or any other information about them; (4) provide or pass along to Employees or Former Employees any information regarding potential jobs or entities or persons to work for, including but not limited to job openings, job postings, or the names or contact information of individuals or companies hiring people or accepting job applications; and/or (5) offer employment or work to any Employees or Former Employees. For purposes of this covenant, “Former Employees” shall refer to employees who are not employed by the Company at the time of the attempted recruiting or hiring, but were employed by, or working for the Company in the three (3) months prior to the time of the attempted recruiting or hiring and/or interference. - 4 -

D. Effect of Termination of Employment other than a Change in Control Termination on Agreements Not to Compete and Not to Solicit. 1. In the event Grantee voluntarily resigns or is discharged by the Company with Cause at any time prior to the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth in Sections II.A, II.B and II.C. shall remain in full force and effect. 2. In the event Grantee is discharged by the Company other than with Cause, including in connection with a Workforce Reduction or Position Elimination, or certain divestiture related terminations, prior to the vesting of the Restricted Stock Unit, the prohibitions set forth in Section II.A shall remain in full force and effect during the period of time following Grantee’s termination equal to the lesser of (x) the Restricted Period or (y) the period of time during which Grantee is deemed to be entitled to severance measured by the sum of (i) the number of weeks Grantee is entitled to severance under the Company’s applicable severance policy, plus (ii) a number of weeks equal to (A) the value of the Restricted Stock Units that would remain outstanding subject to the achievement of the performance goals (or the value of the acceleration, if any, of the vesting of any Restricted Stock Unit as a result of Grantee’s termination under this Agreement or the Plan that would otherwise have been forfeited), with such value measured by multiplying the number of Shares underlying the Restricted Stock Units. assuming target performance has been achieved (or by the number of Shares underlying the Restricted Stock Unit that become vested as a result of the acceleration of vesting, if any). by the per Share Fair Market Value on the Last Day, divided by (B) Grantee’s then-current weekly base salary, plus (iii) any additional period that the Company determines to provide severance to Grantee, in its discretion. 3. In the event Grantee is discharged by the Company other than with Cause prior to vesting herein of the Restricted Stock Units, the prohibitions set forth in Sections II.B and II. C above shall remain in full force and effect. 4. After the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth herein shall remain in full force and effect, except as otherwise provided in Section II.E. E. Effect of a Change in Control Termination on Agreements Not to Compete and Not to Solicit. 1. Notwithstanding anything set forth in Section II.D, in the event of a Change in Control Termination, the prohibitions on Grantee set forth in Section II.A shall remain in full force and effect only if the acquirer or successor to the Company following the Change in Control shall, solely at its option, pay, within thirty (30) days following Grantee's employment termination date with the Company or its successor, to Grantee the Non-Compete Payment. Notwithstanding any previous agreement between Grantee and the Company relating to the prohibitions on Grantee set forth in Section II.A, the “Non- Compete Payment” shall be an amount at least equal to Grantee’s then current annual base salary. Such amount shall be in addition to any other amounts paid or payable to Grantee with respect to other severance plans or policies maintained by the Company. For the avoidance of doubt, the provisions of this Section - 5 -

II.E shall supersede any agreement between Grantee and the Company relating to the prohibitions on Grantee set forth in Section II.A, with the exception of any similar agreement contained in (i) any employment agreement between Grantee and the Company, (ii) any agreement between Grantee and the Company not related to the employment of Grantee by the Company, (iii) any severance plan or policy of the Company and (iv) any change in control severance plan or policy of the Company. 2. In the event of a Change in Control Termination, the prohibitions on Grantee set forth in Sections II.B. and II.C. shall remain in full force and effect. F. Governing Law. Notwithstanding any other provision herein to the contrary, the provisions of this Section II of the Agreement shall be governed by, and construed in accordance with, the laws of the Commonwealth of Kentucky without regard to its conflicts or choice of laws rules or principles that might otherwise refer construction or interpretation of this Section II to the substantive law of another jurisdiction. G. Injunctive Relief; Invalidity of Any Provision. Grantee acknowledges that (1) his or her services to the Company are of a special, unique and extraordinary character, (2) his or her position with the Company will place him or her in a position of confidence and trust with respect to the operations of the Company, (3) he or she will benefit from continued employment with the Company, (4) the nature and periods of restrictions imposed by the covenants contained in this Section II are fair, reasonable and necessary to protect the Company, (5) the Company would sustain immediate and irreparable loss and damage if Grantee were to breach any of such covenants, and (6) the Company’s remedy at law for such a breach will be inadequate. Accordingly, Grantee agrees and consents that the Company, in addition to the recovery of damages and all other remedies available to it, at law or in equity, shall be entitled to seek both preliminary and permanent injunctions to prevent and/or halt a breach or threatened breach by Grantee of any covenant contained in Section II hereof. If any provision of this Section II is determined by a court of competent jurisdiction to be invalid in whole or in part, it shall be deemed to have been amended, whether as to time, area covered or otherwise, as and to the extent required for its validity under applicable law, and as so amended, shall be enforceable. The parties further agree to execute all documents necessary to evidence such amendment. III. MISCELLANEOUS PROVISIONS A. Binding Effect & Adjustment. This Agreement shall be binding and conclusive upon each successor and assign of the Company. Grantee’s obligations hereunder shall not be assignable to any other person or entity. It is the intent of the parties to this Agreement that the benefits of any appreciation of the underlying Shares during the term of the Award shall be preserved in any event, including but not limited to a recapitalization, merger, consolidation, reorganization, stock dividend, stock split, reverse stock split, spin-off or similar transaction, or other change in corporate structure affecting the Shares, as more fully described in Sections 4.6 and 11 of the Plan. All obligations imposed upon Grantee and all rights granted to Grantee and to the Company shall be binding upon Grantee's heirs and legal representatives. - 6 -

B. Amendment. This Agreement may only be amended by a writing executed by each of the parties hereto. C. Governing Law. Except as to matters of federal law and the provisions of Section II hereof, this Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware without regard to its conflict of laws rules. This Agreement shall also be governed by, and construed in accordance with, the terms of the Plan. D. No Employment Agreement. Nothing herein confers on Grantee any rights with respect to the continuance of employment or other service with the Company, nor will it interfere with any right the Company would otherwise have to terminate or modify the terms of Grantee's employment or other service at any time. E. Severability. If any provision of this Agreement is or becomes or is deemed invalid, illegal or unenforceable in any relevant jurisdiction, or would disqualify this Award under any law deemed applicable by the Committee, such provision shall be construed or deemed amended to conform to applicable laws or if it cannot be construed or deemed amended without, in the determination of the Committee, materially altering the intent of the Plan, it shall be stricken and the remainder of the Agreement shall remain in full force and effect. F. Defined Terms. 1. Any term used herein and not otherwise defined herein shall have the same meaning as in the Plan. Any conflict between this Agreement and the Plan will be resolved in favor of the Plan. Any disputes or questions of right or obligation which shall result from or relate to any interpretation of this Agreement shall be determined by the Committee. Any such determination shall be binding and conclusive upon Grantee and any person or persons claiming through Grantee as to any rights hereunder. 2. For the purposes of this Agreement, the following terms shall have the following meaning: (i) “Change in Control Termination” means, in the event unvested Restricted Stock Units and DERs are assumed, converted, continued or substituted in connection with a Change in Control, if the employment of Grantee is terminated within two (2) years following the Change in Control (i) by the Company or its acquirer or successor for any reason other than Cause or (ii) by Grantee with Good Reason. (ii) “Competitive Product or Service” means any product, process, system or service (in existence or under development) of any person or organization other than the Company that is the same as, similar to, or competes with, a product, process, system or service (in existence or under development) upon which Grantee worked or for which Grantee had responsibilities at the Company during the twenty-four (24) months prior to the Last Day (as defined below). (iii) “Competitor” means Grantee or any other person or organization engaged in, or about to become engaged in, research or development, production, marketing, leasing, selling, or servicing of a Competitive Product or Service. - 7 -

(iv) “Divestiture” means the sale or other transfer of equity securities of a Subsidiary to a person or entity other than the Company or an affiliate of the Company, or if a Subsidiary leases, exchanges or transfers all or any portion of its assets to such a person or entity, then the Committee may specify that such transaction or event constitutes a “Divestiture”. (v) “Good Reason” shall mean, unless otherwise defined in a written employment agreement in effect between the Company or any of its Subsidiaries and Grantee, the relocation of Grantee’s office at which Grantee is to perform his or her duties to a location more than thirty (30) miles from the location at which Grantee performed his or her duties prior to a Change in Control. (vi) “Last Day” means Grantee’s last day of employment with the Company regardless of the reason for Grantee’s separation. (vii) “Position Elimination” means the elimination of Grantee’s position. (viii) “Protected Relationship” means policyholders, agents, brokers, dealers, distributers, sources of supply or customers with whom, within twenty-four (24) months prior to the Last Day, Grantee, directly or indirectly (e.g., through employees whom Grantee supervised) had material business contact and/or about whom Grantee obtained confidential information and trade secrets. (ix) “Restricted Geographic Area” means the territory (i.e.: (i) state(s), (ii) county(ies), or (iii) city(ies)) in which, during the twenty-four (24) months prior to the Last Day, Grantee provided material services on behalf of the Company (or in which Grantee supervised directly, indirectly, in whole or in part, the servicing activities). (x) “Restricted Period” means the period of Grantee’s employment with the Company and a period of twelve (12) months after the Last Day. Grantee recognizes that the durational term is reasonably and narrowly tailored to the Company’s legitimate business interest and need for protection with each position. (xi) “Strategic Joint Venture” means a business arrangement entered into by the Company with one or more other parties to own and operate an entity in which the Company continues to have a strategic interest. (xii) “Workforce Reduction” means a reduction in force, as determined by the Company in accordance with its standard coding procedures. G. Execution. If Grantee shall fail to execute this Agreement, either manually with a paper document, or through the online grant agreement procedure with the Company’s designated broker–dealer, and, if manually executed, return the executed original to the Secretary of the Company, the Award shall be null and void. The choice of form will be at the Company’s discretion. H. Section 409A. All Restricted Stock Units granted pursuant to this Agreement are intended either to be exempt from Section 409A of the Code, or, if subject to Section 409A of the Code, to be administered, operated and construed in compliance with Section 409A of the Code and any guidance issued thereunder. This Agreement and the Plan shall be administered in a manner consistent with this - 8 -

intent and any provision that would cause the Agreement or Plan to fail to satisfy the first sentence of this section shall have no force and effect. Notwithstanding anything contained herein to the contrary, Restricted Stock Units (and related DERs) that (a) constitute “nonqualified deferred compensation” as defined under Section 409A of the Code and (b) vest as a consequence of Grantee’s termination of employment, shall not be delivered until the date that Grantee incurs a “separation from service” within the meaning of Section 409A of the Code (or, if Grantee is a “specified employee” within the meaning of Section 409A of the Code and any guidance issued thereunder, the date that is six months and one day following the date of such “separation from service” (or on the date of Grantee’s death, if earlier)). In addition, each amount to be paid or benefit to be provided to Grantee pursuant to this Agreement that constitutes deferred compensation subject to Section 409A of the Code, shall be construed as a separate identified payment for purposes of Section 409A of the Code. - 9 -

IN WITNESS WHEREOF, Company has caused this Agreement to be executed on its behalf by its duly authorized officer, and Grantee has executed this Agreement, each as of the day first above written. "Company" ATTEST: HUMANA INC. BY: BY: JOSEPH C. VENTURA BRUCE D. BROUSSARD Chief Legal Officer & Corporate Secretary President & Chief Executive Officer “Grantee” <first_name> <middle_name> <last_name> - 10 -

APPENDIX A Payout Matrix for Performance-Based Restricted Stock Units The <shares_awarded> Restricted Stock Units represent the target number of shares of common stock that could potentially be earned on the Vesting Date if the below strategic measure is achieved at the target level. Performance above or below the target level will yield vesting of a different amount of shares of common stock, according to the following matrix:

EX-10.HH

Exhibit 10(hh) HUMANA INC. INCENTIVE STOCK OPTION AGREEMENT AND AGREEMENT NOT TO COMPETE OR SOLICIT UNDER THE 2011 STOCK INCENTIVE PLAN THIS AGREEMENT (“Agreement”) made as of <award_date> (the “Date of Grant”) by and between HUMANA INC., a corporation duly organized and existing under the laws of the State of Delaware (hereinafter referred to as the "Company"), and <first_name> <middle_name> <last_name>, an employee of the Company (hereinafter referred to as "Optionee"). WITNESSETH WHEREAS, the Humana Inc. 2011 Stock Incentive Plan (the "Plan"), was approved by the Company’s Board of Directors and stockholders; and WHEREAS, the Company desires to grant to Optionee an option to purchase shares of common stock of the Company in accordance with the Plan; NOW, THEREFORE, in consideration of the premises and mutual covenants hereinafter set forth, and other good and valuable consideration, the Company and Optionee agree as follows: I. OPTION GRANT A. Grant of Option. The Company hereby grants to Optionee, as a matter of separate inducement and agreement and not in lieu of salary or other compensation for services, an Incentive Stock Option to purchase <shares_awarded> shares of the $.16-2/3 par value common stock of the Company ("Common Stock") at the purchase price of <award_price> per share (the "Option") exercisable on the terms and conditions set forth herein. B. Term. The term of the Option shall commence upon the Date of Grant, and shall expire on <expire_Date> (the “Expiration Date”). C. Vesting of Option. Except as otherwise set forth herein, the Option shall be exercisable by Optionee or his/her personal representative on and after the first anniversary of the Date of Grant in cumulative annual installments of one-third of the number of Shares covered hereby (each such date, a “Vesting Date” and the period between each Vesting Date or between the Date of Grant and a Vesting Date, as applicable, a “Vesting Period”), subject to Optionee’s continued employment with the Company through each Vesting Date, except as set forth in Section D below. D. Effect of Termination of Employment on Option. If the employment of Optionee is terminated for any reason, the Option shall vest and remain exercisable as follows, but in no event beyond the Expiration Date: 1. If the employment of Optionee is terminated by the Company for Cause, all the rights of Optionee under this Agreement, whether or not exercisable, shall terminate immediately. 2. In the event of Optionee’s Retirement, (i) to the extent that this Option (or portion hereof) is exercisable as of the date of such Retirement, this Option (or portion hereof) shall be exercisable NQ – NCNS - RE

at any time within two (2) years after the date of Retirement, but in no event beyond the Expiration Date, and only to the extent the Option (or portion hereof) was exercisable at the date of Retirement, and (ii) to the extent that this Option (or portion hereof) is not exercisable as of the date of such Retirement, a prorated portion of the Option that would have vested on the next scheduled Vesting Date shall vest and become exercisable upon the next scheduled Vesting Date, with the proration to be determined by calculating the product of (A) the quotient of (x) the number of completed months Optionee has been employed since the Date of Grant or the most recent Vesting Date, as applicable, divided by (y) the number of months in the current Vesting Period, multiplied by (B) the total number of Options that were scheduled to vest and become exercisable on the next scheduled Vesting Date. For purposes of the foregoing calculation, a month is complete on the day in the following month that corresponds to the Date of Grant. The portion of the Option that vests pursuant to clause (ii) of this Section I.D.2 shall be exercisable at any time within two (2) years following the date of Optionee’s Retirement, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of Optionee’s Retirement and could not become exercisable after taking into account the provisions of this Section I.D.2. shall be immediately forfeited upon Optionee’s Retirement. Any portion of the Option that is not exercisable on the date of Optionee’s Retirement and could not become exercisable after taking into account the provisions of this Section I.D.2. shall be immediately forfeited upon Optionee’s Retirement. 3. In the event of termination due to death or Disability of Optionee while in the employ of the Company, this Option shall become fully vested and exercisable of the termination due to death or Disability of Optionee and shall remain exercisable by Optionee or the person or the persons to whom those rights pass by will or by the laws of descent and distribution or, if appropriate, by the legal representative of Optionee or the estate of Optionee at any time within two (2) years after the date of such death or the date of determination of Disability, but in no event beyond the Expiration Date. 4. In the event that Optionee’s employment with the Company terminates due to a Divestiture of the business to which Optionee provides services, (i) to the extent that this Option (or portion hereof) is exercisable as of the date of such termination of employment, this Option (or portion hereof) shall be exercisable until the date that is ninety (90) days following the last date on which any portion of the Option is scheduled to vest, but in no event beyond the Expiration Date, and only to the extent the Option (or portion hereof) was exercisable at the date of such termination of employment, and (ii) to the extent that this Option (or portion hereof) is not exercisable as of the date of such termination of employment, [and (A) the Company maintains a strategic interest in the divested business, as determined by the Committee in its sole discretion,]1 the unvested portion of the Option shall continue to vest and become exercisable upon the regular Vesting Dates through the date that the Option would become fully vested; provided that[, in the event the Company maintains a strategic interest in the divested business, as determined by the Committee in its sole discretion,]2 the Optionee must remain employed by the divested business on each of the 1 NTD: Applicable only for annual award. Remove for new hire. 2 NTD: Applicable only for new hire. Remove for annual award. 2

applicable Vesting Dates. For the avoidance of doubt, if the Optionee’s employment with the aforementioned divested business terminates prior to a Vesting Date, the Optionee’s unvested Option will no longer vest pursuant to this Section I.D.4 and will be forfeited upon such termination; [or (B) the Company does not maintain a strategic interest in the divested business, as determined by the Committee in its sole discretion, the unvested portion of the Option shall continue to vest and become exercisable upon the regular Vesting Dates that would occur during the twelve (12) month period immediately following the termination of Optionee’s employment as if Optionee continued to be employed by the Company during such period,]3 and the portion of the Option that vests pursuant to this clause (ii) shall be exercisable for ninety (90) days following the last date on which any portion of the Option vests, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of Optionee’s termination of employment and could not become exercisable after taking into account the provisions of this Section I.D.4. shall be immediately forfeited upon Optionee’s termination of employment. 5. In the event that Optionee’s employment with the Company terminates due to a Workforce Reduction or a Position Elimination, (i) to the extent that this Option (or portion hereof) is exercisable as of the date of such termination of employment, this Option (or portion hereof) shall be exercisable until the date that is ninety (90) days following the last date on which any portion of the Option is scheduled to vest, but in no event beyond the Expiration Date, and only to the extent the Option (or portion hereof) was exercisable in accordance with this Section I.D.6, and (ii) to the extent that this Option (or portion hereof) is not exercisable as of the date of such termination of employment, the unvested portion of the Option shall continue to vest and become exercisable upon the regular Vesting Dates that would occur [during the twelve (12) month period immediately following the termination of Optionee’s employment]4 as if Optionee continued to be employed by the Company, and the portion of the Option that vests pursuant to this clause (ii) shall be exercisable for ninety (90) days following the last date on which any portion of the Option vests, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of Optionee’s termination of employment and could not become exercisable after taking into account the provisions of this Section I.D.5. shall be immediately forfeited upon Optionee’s termination of employment. 6. In the event that Optionee’s employment with the Company terminates due to a transfer to a Strategic Joint Venture, (i) to the extent that this Option (or portion hereof) is exercisable as of the date of such termination of employment, this Option (or portion hereof) shall be exercisable until the date that is ninety (90) days following the last date on which any portion of the Option is scheduled to vest, but in no event beyond the Expiration Date, and only to the extent the Option (or portion hereof) was exercisable at the date of such termination of employment, and (ii) to the extent that this Option (or portion hereof) is not exercisable as of the date of such termination of employment, the unvested portion of the Option shall continue to vest and become exercisable upon the regular Vesting Dates through the date that 3 NTD: Applicable only for annual award. Remove for new hire. 4 NTD: Applicable for annual awards. Remove for new hires. 3

the Option would become fully vested as if Optionee continued to be employed through such Vesting Date, and the portion of the Option that vests pursuant to this clause (ii) shall be exercisable for ninety (90) days following the last date on which any portion of the Option vests, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of Optionee’s termination of employment and could not become exercisable after taking into account the provisions of this Section I.D.6. shall be immediately forfeited upon Optionee’s termination of employment. 7. In the event of a Change in Control Termination, this Option (or any option or other award for which this Option is substituted or into which this Option is converted into in connection with the Change in Control) shall become fully vested and immediately exercisable in its entirety, and this Option (or any substitute or converted award) shall remain exercisable at any time within two (2) years after the date of termination of Optionee’s employment, but in no event beyond the Expiration Date. 8. If the employment of Optionee terminates for any reason other than for Cause, Retirement, death or Disability, Position Elimination, Workforce Reduction, Divestiture, due to a transfer to a Strategic Joint Venture or as a result of a Change in Control Termination, unless otherwise specified herein, all the rights of Optionee under this Agreement then exercisable shall remain exercisable at any time within ninety (90) days after the later of the date of such termination and the last date that the Option vests pursuant to the terms of this Agreement, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of the Optionee’s termination of employment and could not become exercisable after taking into account the provision of Section I.D. shall be immediately forfeited upon Optionee’s termination of employment. E. Exercise of Option. 1. The Option shall be exercisable only by written notice to the Secretary of the Company at the Company's principal executive offices, or through the online procedure to such broker- dealer as designated by the Company, Optionee or his/her legal representative as herein provided. Such notice shall state the number of Shares with respect to which the Option is being exercised and shall be signed, or authorized electronically, by Optionee or his/her legal representative, as applicable. 2. The purchase price shall be paid as follows: a) In full in cash upon the exercise of the Option; b) By tendering to the Company Shares owned by Optionee prior to the date of exercise and having an aggregate Fair Market Value equal to the cash exercise price applicable to the Option; or c) A combination of I.E.(2)(a) and I.E.(2)(b) above. 3. Federal, state and local income and employment taxes and other amounts as may be required by law to be collected by the Company (“Withholding Taxes”) in connection with the exercise of the Option shall be paid pursuant to the Plan by Optionee prior to the delivery of any Common Stock under this Agreement. The Company shall, at Optionee’s election, withhold delivery of a number of Shares with a Fair Market Value as of the exercise date equal to the Withholding Taxes in satisfaction of Optionee’s obligations hereunder. 4

II. AGREEMENT NOT TO COMPETE AND AGREEMENT NOT TO SOLICIT. Optionee agrees and understands that the Company’s business is a profit-generating business operating in a highly competitive business environment and that the Company has a legitimate business interest in, among other things, its confidential information and trade secrets (including as protected in other agreements and policies between the Company and Optionee) that it is providing Optionee, and in the significant time, money, training, team building and other efforts it expends to develop Optionee’s skills to assist in performing Optionee’s duties for the Company, including with respect to establishing, developing and maintaining the goodwill and business relationships with Protected Relationships (defined below) and employees, each of which Optionee agrees are valuable assets of the Company to which it has devoted substantial resources. Optionee acknowledges that the grant Optionee is receiving under the Plan is a meaningful way that the Company entrusts Optionee with its goodwill and aligns Optionee with the Company objective of increasing the value of the Company’s business. Accordingly, Optionee acknowledges the importance of protecting the value of the Company’s business through, among other things, covenants to restrict Optionee from engaging in activities that would adversely affect the value of the Company and its goodwill. A. Agreement Not to Compete. Optionee agrees that during the Restricted Period (defined below) and within the Restricted Geographic Area (defined below), Optionee will not, directly or indirectly, perform the same or similar responsibilities Optionee performed for the Company in connection with a Competitive Product or Service (defined below). Notwithstanding the foregoing, Optionee may accept employment with a Competitor (defined below) whose business is diversified, provided that: (1) Optionee will not be engaged in working on or providing Competitive Products or Services, or otherwise use or disclose the Company’s confidential information or trade secrets; and (2) the Company receives written assurances from the Competitor and Optionee that are satisfactory to the Company that Optionee will not work on or provide Competitive Products or Services, or otherwise use or disclose confidential information or trade secrets. In addition, nothing in this Agreement is intended to prevent Optionee from investing Optionee’s funds in securities of a person engaged in a business that is directly competitive with the Company if the securities of such a person are listed for trading on a registered securities exchange or actively traded in an over-the-counter market and Optionee’s holdings represent less than one percent (1%) of the total number of outstanding shares or principal amount of the securities of such a person. B. Agreement Not to Solicit Protected Relationships. During the Restricted Period and in connection with a Competitive Product or Service, Optionee shall not, individually or jointly with others, directly or indirectly: (1) solicit or attempt to solicit any Protected Relationships (defined below); or (2) induce or encourage any Protected Relationships to terminate a relationship with the Company or to otherwise cease to accept services or products from the Company. C. Agreement Not to Solicit Employees. During the Restricted Period, Optionee shall not, individually or jointly with others, directly or indirectly: (1) or by assisting others, solicit, recruit, hire, or encourage (or attempt to solicit, recruit, hire or encourage), any Company employees or former employees with whom Optionee worked, had business contact, or about whom Optionee gained non-public or 5

confidential information (“Employees or Former Employees”); (2) contact or communicate with Employees or Former Employees for the purpose of inducing, assisting, encouraging and/or facilitating them to terminate their employment with the Company or find employment or work with another person or entity; (3) provide or pass along to any person or entity the name, contact and/or background information about any Employees or Former Employees or provide references or any other information about them; (4) provide or pass along to Employees or Former Employees any information regarding potential jobs or entities or persons to work for, including but not limited to job openings, job postings, or the names or contact information of individuals or companies hiring people or accepting job applications; and/or (5) offer employment or work to any Employees or Former Employees. For purposes of this covenant, “Former Employees” shall refer to employees who are not employed by the Company at the time of the attempted recruiting or hiring, but were employed by, or working for the Company in the three (3) months prior to the time of the attempted recruiting or hiring and/or interference. D. Effect of Termination of Employment other than a Change in Control Termination on Agreements Not to Compete and Not to Solicit. 1. In the event Optionee voluntarily resigns or is discharged by the Company with Cause at any time prior to the vesting of the Option, the prohibitions on Optionee set forth in Sections II.A, II.B and II.C shall remain in full force and effect. 2. In the event Optionee is discharged by the Company other than with Cause, including in connection with a Workforce Reduction or Position Elimination, or certain divestiture related terminations, prior to the vesting of the Option, the prohibitions set forth in Section II.A shall remain in full force and effect during the period of time following Optionee’s termination equal to the lesser of (x) the Restricted Period or (y) the period of time during which Optionee is deemed to be entitled to severance measured by the sum of (i) the number of weeks Optionee is entitled to severance under the Company’s applicable severance policy, plus (ii) a number of weeks equal to (A) the value of the acceleration or continuation of the vesting of any Options as a result of Optionee’s termination under this Agreement or the Plan that would otherwise have been forfeited, with such value measured by multiplying the number of Shares underlying the Options that vested as a result of the termination of employment by the difference of the per Share Fair Market Value on the Last Day minus the applicable per Share exercise price, divided by (B) Optionee’s then-current weekly base salary, plus (iii) any additional period that the Company determines to provide severance to Optionee, in its discretion. 3. In the event Optionee is discharged by Company other than with Cause prior to vesting herein of the Option, the prohibitions set forth in Sections II.B and II.C above shall remain in full force and effect. 4. After the vesting of the Option, the prohibitions on Optionee set forth herein shall remain in full force and effect, except as otherwise provided in Section II.E. E. Effect of a Change in Control Termination on Agreements Not to Compete and Not to Solicit. 6

1. Notwithstanding anything set forth in Section II.D., in the event of a Change in Control Termination, the prohibitions on Optionee set forth in Section II.A shall remain in full force and effect only if the acquirer or successor to the Company following the Change in Control shall, solely at its option, pay, within thirty (30) days following Optionee's employment termination date with the Company or its successor, to Optionee the Non-Compete Payment. Notwithstanding any previous agreement between Optionee and the Company relating to the prohibitions set forth in Section II.A, the “Non-Compete Payment” shall be an amount at least equal to Optionee’s then current annual base salary. Such amount shall be in addition to any other amounts paid or payable to Optionee with respect to other severance plans or policies maintained by the Company. For the avoidance of doubt, the provisions of this Section II.E shall supersede any agreement between Optionee and the Company relating to the prohibitions on Optionee set forth in Section II.A, with the exception of any similar agreement contained in (i) any employment agreement between Optionee and the Company, (ii) any agreement between Optionee and the Company not related to the employment of Optionee by the Company, (iii) any severance plan or policy of the Company and (iv) any change in control severance plan or policy of the Company. 2. In the event of a Change in Control Termination, the prohibitions on Optionee set forth in Sections II.B. and II C. shall remain in full force and effect. F. Governing Law. Notwithstanding any other provision herein to the contrary, the provisions of this Section II of the Agreement shall be governed by, and construed in accordance with, the laws of the Commonwealth of Kentucky without regard to its conflicts or choice of laws rules or principles that might otherwise refer construction or interpretation of this Section II to the substantive law of another jurisdiction. G. Injunctive Relief; Invalidity of Any Provision. Optionee acknowledges that (1) his or her services to the Company are of a special, unique and extraordinary character, (2) his or her position with the Company will place him or her in a position of confidence and trust with respect to the operations of the Company, (3) he or she will benefit from continued employment with the Company, (4) the nature and periods of restrictions imposed by the covenants contained in this Section II are fair, reasonable and necessary to protect the Company, (5) the Company would sustain immediate and irreparable loss and damage if Optionee were to breach any of such covenants, and (6) the Company’s remedy at law for such a breach will be inadequate. Accordingly, Optionee agrees and consents that the Company, in addition to the recovery of damages and all other remedies available to it, at law or in equity, shall be entitled to seek both preliminary and permanent injunctions to prevent and/or halt a breach or threatened breach by Optionee of any covenant contained in Section II hereof. If any provision of this Section II is determined by a court of competent jurisdiction to be invalid in whole or in part, it shall be deemed to have been amended, whether as to time, area covered or otherwise, as and to the extent required for its validity under applicable law, and as so amended, shall be enforceable. The parties further agree to execute all documents necessary to evidence such amendment. 7

III. MISCELLANEOUS PROVISIONS A. Binding Effect & Adjustment. This Agreement shall be binding and conclusive upon each successor and assign of the Company. Optionee’s obligations hereunder shall not be assignable to any other person or entity. It is the intent of the parties to this Agreement that the benefits of any appreciation of the underlying Common Stock during the term of the Award shall be preserved in any event, including but not limited to a recapitalization, merger, consolidation, reorganization, stock dividend, stock split, reverse stock split, spin-off or similar transaction, or other change in corporate structure affecting the Shares, as more fully described in Sections 4.6 and 11 of the Plan. All obligations imposed upon Optionee and all rights granted to Optionee and to the Company shall be binding upon Optionee's heirs and legal representatives. B. Amendment. This Agreement may only be amended by a writing executed by each of the parties hereto. C. Governing Law. Except as to matters of federal law and the provisions of Section II hereof, this Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware without regard to its conflict of laws rules. This Agreement shall also be governed by, and construed in accordance with, the terms of the Plan. D. Jurisdiction; Service of Process. Any action or proceeding seeking to enforce any provision of, or based on any right arising out of, this Agreement may be brought against any of the parties in the courts of the Commonwealth of Kentucky, County of Jefferson, or, if it has or can acquire jurisdiction, in the United States District Court for the Western District of Kentucky, and each of the parties consents to the jurisdiction of such courts (and of the appropriate appellate courts) in any such action or proceeding and waives any objection to venue laid therein. Process in any action or proceeding referred to in the preceding sentence may be served on any party anywhere in the world. E. No Employment Agreement. Nothing herein confers on Optionee any rights with respect to the continuance of employment or other service with the Company, nor will it interfere with any right the Company would otherwise have to terminate or modify the terms of Optionee's employment or other service at any time. F. Severability. If any provision of this Agreement is or becomes or is deemed invalid, illegal or unenforceable in any relevant jurisdiction, or would disqualify this Award under any law deemed applicable by the Committee, such provision shall be construed or deemed amended to conform to applicable laws or if it cannot be construed or deemed amended without, in the determination of the Committee, materially altering the intent of the Plan, it shall be stricken and the remainder of the Agreement shall remain in full force and effect. Any provision in this Agreement determined by competent authority to be in conflict with 422 of the Internal Revenue Code of 1986, as amended, or its successor, in regard to qualifying this Option as an incentive stock option shall be ineffective ab initio to the extent of such conflict. G. Assignment. The Option granted under this Agreement to Optionee may not be assigned, transferred, pledged, alienated or hypothecated in any manner during Optionee's lifetime, but shall be solely and exclusively the right of Optionee to exercise during his/her lifetime. Should Optionee attempt to assign, 8

transfer, pledge, alienate or hypothecate the Option or any rights hereunder in any manner whatsoever, such action shall constitute a breach of the covenants hereunder and the Company may terminate the Option as to any then unexercised shares. H. Defined Terms. 1. Any term used herein and not otherwise defined herein shall have the same meaning as in the Plan. Any conflict between this Agreement and the Plan will be resolved in favor of the Plan. Any disputes or questions of right or obligation which shall result from or relate to any interpretation of this Agreement shall be determined by the Committee. Any such determination shall be binding and conclusive upon Optionee and any person or persons claiming through Optionee as to any rights hereunder. 2. For the purposes of this Agreement, the following terms shall have the following meaning: (i) “Change in Control Termination” means, in the event the Option is assumed, converted, continued or substituted in connection with a Change in Control, if the employment of Optionee is terminated within two (2) years following the Change in Control (i) by the Company or its acquirer or successor for any reason other than Cause or (ii) by Optionee with Good Reason. (ii) “Competitive Product or Service” means any product, process, system or service (in existence or under development) of any person or organization other than the Company that is the same as, similar to, or competes with, a product, process, system or service (in existence or under development) upon which Optionee worked or for which Optionee had responsibilities at the Company during the twenty-four (24) months prior to the Last Day (as defined below). (iii) “Competitor” means Optionee or any other person or organization engaged in, or about to become engaged in, research or development, production, marketing, leasing, selling, or servicing of a Competitive Product or Service. (iv) “Divestiture” means the sale or other transfer of equity securities of a Subsidiary to a person or entity other than the Company or an affiliate of the Company, or if a Subsidiary leases, exchanges or transfers all or any portion of its assets to such a person or entity, then the Committee may specify that such transaction or event constitutes a “Divestiture”. (v) “Good Reason” shall mean, unless otherwise defined in a written employment agreement in effect between the Company or any of its Subsidiaries and Optionee, the relocation of Optionee’s office at which Optionee is to perform his or her duties to a location more than thirty (30) miles from the location at which Optionee performed his or her duties prior to a Change in Control. (vi) “Last Day” means Optionee’s last day of employment with the Company regardless of the reason for Optionee’s separation. (vii) “Position Elimination” means the elimination of Optionee’s position. 9

(viii) “Protected Relationship” means policyholders, agents, brokers, dealers, distributers, sources of supply or customers with whom, within twenty-four (24) months prior to the Last Day, Optionee, directly or indirectly (e.g., through employees whom Optionee supervised) had material business contact and/or about whom Optionee obtained confidential information and trade secrets. (ix) “Restricted Geographic Area” means the territory (i.e.: (i) state(s), (ii) county(ies), or (iii) city(ies)) in which, during the twenty-four (24) months prior to the Last Day, Optionee provided material services on behalf of the Company (or in which Optionee supervised directly, indirectly, in whole or in part, the servicing activities). (x) “Restricted Period” means the period of Optionee’s employment with the Company and a period of twelve (12) months after the Last Day. Optionee recognizes that the durational term is reasonably and narrowly tailored to the Company’s legitimate business interest and need for protection with each position. (xi) “Strategic Joint Venture” means a business arrangement entered into by the Company with one or more other parties to own and operate an entity in which the Company continues to have a strategic interest. (xii) “Workforce Reduction” means a reduction in force, as determined by the Company in accordance with its standard coding procedures. I. Execution. If Optionee shall fail to execute this Agreement, either manually with a paper document, or through the online grant agreement procedure with the Company’s designated broker–dealer, and, if manually executed, return the executed original to the Secretary of the Company, the Award shall be null and void. The choice of form will be at the Company’s discretion. 10

IN WITNESS WHEREOF, Company has caused this Agreement to be executed on its behalf by its duly authorized officer, and Optionee has executed this Agreement, each as of the day first above written. "Company" ATTEST: HUMANA INC. BY: BY: JOSEPH C. VENTURA BRUCE D. BROUSSARD Chief Legal Officer & Corporate Secretary President & Chief Executive Officer “Optionee” <first_name> <middle_name> <last_name> 11

EX-10.II

Exhibit 10(ii) HUMANA INC. STOCK OPTION AGREEMENT AND AGREEMENT NOT TO COMPETE OR SOLICIT UNDER THE 2011 STOCK INCENTIVE PLAN THIS AGREEMENT (“Agreement”) made as of <award_date> (the “Date of Grant”) by and between HUMANA INC., a corporation duly organized and existing under the laws of the State of Delaware (hereinafter referred to as the "Company"), and <first_name> <middle_name> <last_name>, an employee of the Company (hereinafter referred to as "Optionee"). WITNESSETH WHEREAS, the Humana Inc. 2011 Stock Incentive Plan (the "Plan"), was approved by the Company’s Board of Directors and stockholders; and WHEREAS, the Company desires to grant to Optionee an option to purchase shares of common stock of the Company in accordance with the Plan; NOW, THEREFORE, in consideration of the premises and mutual covenants hereinafter set forth, and other good and valuable consideration, the Company and Optionee agree as follows: I. OPTION GRANT A. Grant of Option. The Company hereby grants to Optionee, as a matter of separate inducement and agreement and not in lieu of salary or other compensation for services, a Non-Qualified Stock Option to purchase <shares_awarded> shares of the $.16-2/3 par value common stock of the Company ("Common Stock") at the purchase price of <award_price> per share (the "Option") exercisable on the terms and conditions set forth herein. B. Term. The term of the Option shall commence upon the Date of Grant, and shall expire on <expire_Date> (the “Expiration Date”). C. Vesting of Option. Except as otherwise set forth herein, the Option shall be exercisable by Optionee or his/her personal representative on and after the first anniversary of the Date of Grant in cumulative annual installments of one-third of the number of Shares covered hereby (each such date, a “Vesting Date” and the period between each Vesting Date or between the Date of Grant and a Vesting Date, as applicable, a “Vesting Period”), subject to Optionee’s continued employment with the Company through each Vesting Date, except as set forth in Section D below. D. Effect of Termination of Employment on Option. If the employment of Optionee is terminated for any reason, the Option shall vest and remain exercisable as follows: 1. If the employment of Optionee is terminated by the Company for Cause, all the rights of Optionee under this Agreement, whether or not exercisable, shall terminate immediately. 2. In the event of Optionee’s Retirement, (i) to the extent that this Option (or portion hereof) is exercisable as of the date of such Retirement, this Option (or portion hereof) shall be exercisable NQ – NCNS - RE

at any time within two (2) years after the date of Retirement, but in no event beyond the Expiration Date, and only to the extent the Option (or portion hereof) was exercisable at the date of Retirement, and (ii) to the extent that this Option (or portion hereof) is not exercisable as of the date of such Retirement, a prorated portion of the Option that would have vested on the next scheduled Vesting Date shall vest and become exercisable upon the next scheduled Vesting Date, with the proration to be determined by calculating the product of (A) the quotient of (x) the number of completed months Optionee has been employed since the Date of Grant or the most recent Vesting Date, as applicable, divided by (y) the number of months in the current Vesting Period, multiplied by (B) the total number of Options that were scheduled to vest and become exercisable on the next scheduled Vesting Date. For purposes of the foregoing calculation, a month is complete on the day in the following month that corresponds to the Date of Grant. The portion of the Option that vests pursuant to clause (ii) of this Section I.D.2 shall be exercisable at any time within two (2) years following the date of Optionee’s Retirement, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of Optionee’s Retirement and could not become exercisable after taking into account the provisions of this Section I.D.2. shall be immediately forfeited upon Optionee’s Retirement. Any portion of the Option that is not exercisable on the date of Optionee’s Retirement and could not become exercisable after taking into account the provisions of this Section I.D.2. shall be immediately forfeited upon Optionee’s Retirement. 3. In the event of termination due to death or Disability of Optionee while in the employ of the Company, this Option shall become fully vested and exercisable of the termination due to death or Disability of Optionee and shall remain exercisable by Optionee or the person or the persons to whom those rights pass by will or by the laws of descent and distribution or, if appropriate, by the legal representative of Optionee or the estate of Optionee at any time within two (2) years after the date of such death or the date of determination of Disability, regardless of the Expiration Date. 4. In the event that Optionee’s employment with the Company terminates due to a Divestiture of the business to which Optionee provides services, (i) to the extent that this Option (or portion hereof) is exercisable as of the date of such termination of employment, this Option (or portion hereof) shall be exercisable until the date that is ninety (90) days following the last date on which any portion of the Option is scheduled to vest, but in no event beyond the Expiration Date, and only to the extent the Option (or portion hereof) was exercisable at the date of such termination of employment, and (ii) to the extent that this Option (or portion hereof) is not exercisable as of the date of such termination of employment, [and (A) the Company maintains a strategic interest in the divested business, as determined by the Committee in its sole discretion,]1 the unvested portion of the Option shall continue to vest and become exercisable upon the regular Vesting Dates through the date that the Option would become fully vested; provided that[, in the event the Company maintains a strategic interest in the divested business, as determined by the Committee in its sole discretion,]2 the Optionee must remain employed by the divested business on each of the 1 NTD: Applicable only for annual award. Remove for new hire. 2 NTD: Applicable only for new hire. Remove for annual award. 2

applicable Vesting Dates. For the avoidance of doubt, if the Optionee’s employment with the aforementioned divested business terminates prior to a Vesting Date, the Optionee’s unvested Option will no longer vest pursuant to this Section I.D.4 and will be forfeited upon such termination; [or (B) the Company does not maintain a strategic interest in the divested business, as determined by the Committee in its sole discretion, the unvested portion of the Option shall continue to vest and become exercisable upon the regular Vesting Dates that would occur during the twelve (12) month period immediately following the termination of Optionee’s employment as if Optionee continued to be employed by the Company during such period,]3 and the portion of the Option that vests pursuant to this clause (ii) shall be exercisable for ninety (90) days following the last date on which any portion of the Option vests, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of Optionee’s termination of employment and could not become exercisable after taking into account the provisions of this Section I.D.4. shall be immediately forfeited upon Optionee’s termination of employment. 5. In the event that Optionee’s employment with the Company terminates due to a Workforce Reduction or a Position Elimination, (i) to the extent that this Option (or portion hereof) is exercisable as of the date of such termination of employment, this Option (or portion hereof) shall be exercisable until the date that is ninety (90) days following the last date on which any portion of the Option is scheduled to vest, but in no event beyond the Expiration Date, and only to the extent the Option (or portion hereof) was exercisable in accordance with this Section I.D.6, and (ii) to the extent that this Option (or portion hereof) is not exercisable as of the date of such termination of employment, the unvested portion of the Option shall continue to vest and become exercisable upon the regular Vesting Dates that would occur [during the twelve (12) month period immediately following the termination of Optionee’s employment]4 as if Optionee continued to be employed by the Company, and the portion of the Option that vests pursuant to this clause (ii) shall be exercisable for ninety (90) days following the last date on which any portion of the Option vests, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of Optionee’s termination of employment and could not become exercisable after taking into account the provisions of this Section I.D.5. shall be immediately forfeited upon Optionee’s termination of employment. 6. In the event that Optionee’s employment with the Company terminates due to a transfer to a Strategic Joint Venture, (i) to the extent that this Option (or portion hereof) is exercisable as of the date of such termination of employment, this Option (or portion hereof) shall be exercisable until the date that is ninety (90) days following the last date on which any portion of the Option is scheduled to vest, but in no event beyond the Expiration Date, and only to the extent the Option (or portion hereof) was exercisable at the date of such termination of employment, and (ii) to the extent that this Option (or portion hereof) is not exercisable as of the date of such termination of employment, the unvested portion of the Option shall continue to vest and become exercisable upon the regular Vesting Dates through the date that 3 NTD: Applicable for annual awards. Remove for new hires. 4 NTD: Applicable for annual awards. Remove for new hires. 3

the Option would become fully vested as if Optionee continued to be employed through such Vesting Date, and the portion of the Option that vests pursuant to this clause (ii) shall be exercisable for ninety (90) days following the last date on which any portion of the Option vests, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of Optionee’s termination of employment and could not become exercisable after taking into account the provisions of this Section I.D.6. shall be immediately forfeited upon Optionee’s termination of employment. 7. In the event of a Change in Control Termination, this Option (or any option or other award for which this Option is substituted or into which this Option is converted into in connection with the Change in Control) shall become fully vested and immediately exercisable in its entirety, and this Option (or any substitute or converted award) shall remain exercisable at any time within two (2) years after the date of termination of Optionee’s employment, but in no event beyond the Expiration Date. 8. If the employment of Optionee terminates for any reason other than for Cause, Retirement, death or Disability, Position Elimination, Workforce Reduction, Divestiture, due to a transfer to a Strategic Joint Venture or as a result of a Change in Control Termination, unless otherwise specified herein, all the rights of Optionee under this Agreement then exercisable shall remain exercisable at any time within ninety (90) days after the later of the date of such termination and the last date that the Option vests pursuant to the terms of this Agreement, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of the Optionee’s termination of employment and could not become exercisable after taking into account the provision of Section I.D. shall be immediately forfeited upon Optionee’s termination of employment. E. Exercise of Option. 1. The Option shall be exercisable only by written notice to the Secretary of the Company at the Company's principal executive offices, or through the online procedure to such broker- dealer as designated by the Company, Optionee or his/her legal representative as herein provided. Such notice shall state the number of Shares with respect to which the Option is being exercised and shall be signed, or authorized electronically, by Optionee or his/her legal representative, as applicable. 2. The purchase price shall be paid as follows: a) In full in cash upon the exercise of the Option; b) By tendering to the Company Shares owned by Optionee prior to the date of exercise and having an aggregate Fair Market Value equal to the cash exercise price applicable to the Option; c) A combination of I.E.(2)(a) and I.E.(2)(b) above; or (d) Through the cashless exercise provisions of the designated broker-dealer as described in the procedures communicated to Optionee by the Company. 3. Federal, state and local income and employment taxes and other amounts as may be required by law to be collected by the Company (“Withholding Taxes”) in connection with the exercise of the Option shall be paid pursuant to the Plan by Optionee prior to the delivery of any Common Stock under this Agreement. The Company shall, at Optionee’s election, withhold delivery of a number of Shares 4

with a Fair Market Value as of the exercise date equal to the Withholding Taxes in satisfaction of Optionee’s obligations hereunder. II. AGREEMENT NOT TO COMPETE AND AGREEMENT NOT TO SOLICIT. Optionee agrees and understands that the Company’s business is a profit-generating business operating in a highly competitive business environment and that the Company has a legitimate business interest in, among other things, its confidential information and trade secrets (including as protected in other agreements and policies between the Company and Optionee) that it is providing Optionee, and in the significant time, money, training, team building and other efforts it expends to develop Optionee’s skills to assist in performing Optionee’s duties for the Company, including with respect to establishing, developing and maintaining the goodwill and business relationships with Protected Relationships (defined below) and employees, each of which Optionee agrees are valuable assets of the Company to which it has devoted substantial resources. Optionee acknowledges that the grant Optionee is receiving under the Plan is a meaningful way that the Company entrusts Optionee with its goodwill and aligns Optionee with the Company objective of increasing the value of the Company’s business. Accordingly, Optionee acknowledges the importance of protecting the value of the Company’s business through, among other things, covenants to restrict Optionee from engaging in activities that would adversely affect the value of the Company and its goodwill. A. Agreement Not to Compete. Optionee agrees that during the Restricted Period (defined below) and within the Restricted Geographic Area (defined below), Optionee will not, directly or indirectly, perform the same or similar responsibilities Optionee performed for the Company in connection with a Competitive Product or Service (defined below). Notwithstanding the foregoing, Optionee may accept employment with a Competitor (defined below) whose business is diversified, provided that: (1) Optionee will not be engaged in working on or providing Competitive Products or Services, or otherwise use or disclose the Company’s confidential information or trade secrets; and (2) the Company receives written assurances from the Competitor and Optionee that are satisfactory to the Company that Optionee will not work on or provide Competitive Products or Services, or otherwise use or disclose confidential information or trade secrets. In addition, nothing in this Agreement is intended to prevent Optionee from investing Optionee’s funds in securities of a person engaged in a business that is directly competitive with the Company if the securities of such a person are listed for trading on a registered securities exchange or actively traded in an over-the-counter market and Optionee’s holdings represent less than one percent (1%) of the total number of outstanding shares or principal amount of the securities of such a person. B. Agreement Not to Solicit Protected Relationships. During the Restricted Period and in connection with a Competitive Product or Service, Optionee shall not, individually or jointly with others, directly or indirectly: (1) solicit or attempt to solicit any Protected Relationships (defined below); or (2) induce or encourage any Protected Relationships to terminate a relationship with the Company or to otherwise cease to accept services or products from the Company. C. Agreement Not to Solicit Employees. During the Restricted Period, Optionee shall not, individually or jointly with others, directly or indirectly: (1) or by assisting others, solicit, recruit, hire, or 5

encourage (or attempt to solicit, recruit, hire or encourage), any Company employees or former employees with whom Optionee worked, had business contact, or about whom Optionee gained non-public or confidential information (“Employees or Former Employees”); (2) contact or communicate with Employees or Former Employees for the purpose of inducing, assisting, encouraging and/or facilitating them to terminate their employment with the Company or find employment or work with another person or entity; (3) provide or pass along to any person or entity the name, contact and/or background information about any Employees or Former Employees or provide references or any other information about them; (4) provide or pass along to Employees or Former Employees any information regarding potential jobs or entities or persons to work for, including but not limited to job openings, job postings, or the names or contact information of individuals or companies hiring people or accepting job applications; and/or (5) offer employment or work to any Employees or Former Employees. For purposes of this covenant, “Former Employees” shall refer to employees who are not employed by the Company at the time of the attempted recruiting or hiring, but were employed by, or working for the Company in the three (3) months prior to the time of the attempted recruiting or hiring and/or interference. D. Effect of Termination of Employment other than a Change in Control Termination on Agreements Not to Compete and Not to Solicit. 1. In the event Optionee voluntarily resigns or is discharged by the Company with Cause at any time prior to the vesting of the Option, the prohibitions on Optionee set forth in Sections II.A, II.B and II.C shall remain in full force and effect. 2. In the event Optionee is discharged by the Company other than with Cause, including in connection with a Workforce Reduction or Position Elimination, or certain divestiture related terminations, prior to the vesting of the Option, the prohibitions set forth in Section II.A shall remain in full force and effect during the period of time following Optionee’s termination equal to the lesser of (x) the Restricted Period or (y) the period of time during which Optionee is deemed to be entitled to severance measured by the sum of (i) the number of weeks Optionee is entitled to severance under the Company’s applicable severance policy, plus (ii) a number of weeks equal to (A) the value of the acceleration or continuation of the vesting of any Options as a result of Optionee’s termination under this Agreement or the Plan that would otherwise have been forfeited, with such value measured by multiplying the number of Shares underlying the Options that vested as a result of the termination of employment by the difference of the per Share Fair Market Value on the Last Day minus the applicable per Share exercise price, divided by (B) Optionee’s then-current weekly base salary, plus (iii) any additional period that the Company determines to provide severance to Optionee, in its discretion. 3. In the event Optionee is discharged by Company other than with Cause prior to vesting herein of the Option, the prohibitions set forth in Sections II.B and II.C above shall remain in full force and effect. 4. After the vesting of the Option, the prohibitions on Optionee set forth herein shall remain in full force and effect, except as otherwise provided in Section II.E. 6

E. Effect of a Change in Control Termination on Agreements Not to Compete and Not to Solicit. 1. Notwithstanding anything set forth in Section II.D., in the event of a Change in Control Termination, the prohibitions on Optionee set forth in Section II.A shall remain in full force and effect only if the acquirer or successor to the Company following the Change in Control shall, solely at its option, pay, within thirty (30) days following Optionee's employment termination date with the Company or its successor, to Optionee the Non-Compete Payment. Notwithstanding any previous agreement between Optionee and the Company relating to the prohibitions set forth in Section II.A, the “Non-Compete Payment” shall be an amount at least equal to Optionee’s then current annual base salary. Such amount shall be in addition to any other amounts paid or payable to Optionee with respect to other severance plans or policies maintained by the Company. For the avoidance of doubt, the provisions of this Section II.E shall supersede any agreement between Optionee and the Company relating to the prohibitions on Optionee set forth in Section II.A, with the exception of any similar agreement contained in (i) any employment agreement between Optionee and the Company, (ii) any agreement between Optionee and the Company not related to the employment of Optionee by the Company, (iii) any severance plan or policy of the Company and (iv) any change in control severance plan or policy of the Company. 2. In the event of a Change in Control Termination, the prohibitions on Optionee set forth in Sections II.B. and II C. shall remain in full force and effect. F. Governing Law. Notwithstanding any other provision herein to the contrary, the provisions of this Section II of the Agreement shall be governed by, and construed in accordance with, the laws of the Commonwealth of Kentucky without regard to its conflicts or choice of laws rules or principles that might otherwise refer construction or interpretation of this Section II to the substantive law of another jurisdiction. G. Injunctive Relief; Invalidity of Any Provision. Optionee acknowledges that (1) his or her services to the Company are of a special, unique and extraordinary character, (2) his or her position with the Company will place him or her in a position of confidence and trust with respect to the operations of the Company, (3) he or she will benefit from continued employment with the Company, (4) the nature and periods of restrictions imposed by the covenants contained in this Section II are fair, reasonable and necessary to protect the Company, (5) the Company would sustain immediate and irreparable loss and damage if Optionee were to breach any of such covenants, and (6) the Company’s remedy at law for such a breach will be inadequate. Accordingly, Optionee agrees and consents that the Company, in addition to the recovery of damages and all other remedies available to it, at law or in equity, shall be entitled to seek both preliminary and permanent injunctions to prevent and/or halt a breach or threatened breach by Optionee of any covenant contained in Section II hereof. If any provision of this Section II is determined by a court of competent jurisdiction to be invalid in whole or in part, it shall be deemed to have been amended, whether as to time, area covered or otherwise, as and to the extent required for its validity under applicable law, and as so amended, shall be enforceable. The parties further agree to execute all documents necessary to evidence such amendment. 7

III. MISCELLANEOUS PROVISIONS A. Binding Effect & Adjustment. This Agreement shall be binding and conclusive upon each successor and assign of the Company. Optionee’s obligations hereunder shall not be assignable to any other person or entity. It is the intent of the parties to this Agreement that the benefits of any appreciation of the underlying Common Stock during the term of the Award shall be preserved in any event, including but not limited to a recapitalization, merger, consolidation, reorganization, stock dividend, stock split, reverse stock split, spin-off or similar transaction, or other change in corporate structure affecting the Shares, as more fully described in Sections 4.6 and 11 of the Plan. All obligations imposed upon Optionee and all rights granted to Optionee and to the Company shall be binding upon Optionee's heirs and legal representatives. B. Amendment. This Agreement may only be amended by a writing executed by each of the parties hereto. C. Governing Law. Except as to matters of federal law and the provisions of Section II hereof, this Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware without regard to its conflict of laws rules. This Agreement shall also be governed by, and construed in accordance with, the terms of the Plan. D. Jurisdiction; Service of Process. Any action or proceeding seeking to enforce any provision of, or based on any right arising out of, this Agreement may be brought against any of the parties in the courts of the Commonwealth of Kentucky, County of Jefferson, or, if it has or can acquire jurisdiction, in the United States District Court for the Western District of Kentucky, and each of the parties consents to the jurisdiction of such courts (and of the appropriate appellate courts) in any such action or proceeding and waives any objection to venue laid therein. Process in any action or proceeding referred to in the preceding sentence may be served on any party anywhere in the world. E. No Employment Agreement. Nothing herein confers on Optionee any rights with respect to the continuance of employment or other service with the Company, nor will it interfere with any right the Company would otherwise have to terminate or modify the terms of Optionee's employment or other service at any time. F. Severability. If any provision of this Agreement is or becomes or is deemed invalid, illegal or unenforceable in any relevant jurisdiction, or would disqualify this Award under any law deemed applicable by the Committee, such provision shall be construed or deemed amended to conform to applicable laws or if it cannot be construed or deemed amended without, in the determination of the Committee, materially altering the intent of the Plan, it shall be stricken and the remainder of the Agreement shall remain in full force and effect. G. Assignment. The Option granted under this Agreement to Optionee may not be assigned, transferred, pledged, alienated or hypothecated in any manner during Optionee's lifetime, but shall be solely and exclusively the right of Optionee to exercise during his/her lifetime. Should Optionee attempt to assign, transfer, pledge, alienate or hypothecate the Option or any rights hereunder in any manner whatsoever, 8

such action shall constitute a breach of the covenants hereunder and the Company may terminate the Option as to any then unexercised shares. H. Defined Terms. 1. Any term used herein and not otherwise defined herein shall have the same meaning as in the Plan. Any conflict between this Agreement and the Plan will be resolved in favor of the Plan. Any disputes or questions of right or obligation which shall result from or relate to any interpretation of this Agreement shall be determined by the Committee. Any such determination shall be binding and conclusive upon Optionee and any person or persons claiming through Optionee as to any rights hereunder. 2. For the purposes of this Agreement, the following terms shall have the following meaning: (i) “Change in Control Termination” means, in the event the Option is assumed, converted, continued or substituted in connection with a Change in Control, if the employment of Optionee is terminated within two (2) years following the Change in Control (i) by the Company or its acquirer or successor for any reason other than Cause or (ii) by Optionee with Good Reason. (ii) “Competitive Product or Service” means any product, process, system or service (in existence or under development) of any person or organization other than the Company that is the same as, similar to, or competes with, a product, process, system or service (in existence or under development) upon which Optionee worked or for which Optionee had responsibilities at the Company during the twenty-four (24) months prior to the Last Day (as defined below). (iii) “Competitor” means Optionee or any other person or organization engaged in, or about to become engaged in, research or development, production, marketing, leasing, selling, or servicing of a Competitive Product or Service. (iv) “Divestiture” means the sale or other transfer of equity securities of a Subsidiary to a person or entity other than the Company or an affiliate of the Company, or if a Subsidiary leases, exchanges or transfers all or any portion of its assets to such a person or entity, then the Committee may specify that such transaction or event constitutes a “Divestiture”. (v) “Good Reason” shall mean, unless otherwise defined in a written employment agreement in effect between the Company or any of its Subsidiaries and Optionee, the relocation of Optionee’s office at which Optionee is to perform his or her duties to a location more than thirty (30) miles from the location at which Optionee performed his or her duties prior to a Change in Control. (vi) “Last Day” means Optionee’s last day of employment with the Company regardless of the reason for Optionee’s separation. (vii) “Position Elimination” means the elimination of Optionee’s position. (viii) “Protected Relationship” means policyholders, agents, brokers, dealers, distributers, sources of supply or customers with whom, within twenty-four (24) months prior to the Last 9

Day, Optionee, directly or indirectly (e.g., through employees whom Optionee supervised) had material business contact and/or about whom Optionee obtained confidential information and trade secrets. (ix) “Restricted Geographic Area” means the territory (i.e.: (i) state(s), (ii) county(ies), or (iii) city(ies)) in which, during the twenty-four (24) months prior to the Last Day, Optionee provided material services on behalf of the Company (or in which Optionee supervised directly, indirectly, in whole or in part, the servicing activities). (x) “Restricted Period” means the period of Optionee’s employment with the Company and a period of twelve (12) months after the Last Day. Optionee recognizes that the durational term is reasonably and narrowly tailored to the Company’s legitimate business interest and need for protection with each position. (xi) “Strategic Joint Venture” means a business arrangement entered into by the Company with one or more other parties to own and operate an entity in which the Company continues to have a strategic interest. (xii) “Workforce Reduction” means a reduction in force, as determined by the Company in accordance with its standard coding procedures. I. Execution. If Optionee shall fail to execute this Agreement, either manually with a paper document, or through the online grant agreement procedure with the Company’s designated broker–dealer, and, if manually executed, return the executed original to the Secretary of the Company, the Award shall be null and void. The choice of form will be at the Company’s discretion. 10

IN WITNESS WHEREOF, Company has caused this Agreement to be executed on its behalf by its duly authorized officer, and Optionee has executed this Agreement, each as of the day first above written. "Company" ATTEST: HUMANA INC. BY: BY: JOSEPH C. VENTURA BRUCE D. BROUSSARD Chief Legal Officer & Corporate Secretary President & Chief Executive Officer “Optionee” <first_name> <middle_name> <last_name> 11

EX-10.JJ

Exhibit 10(jj) HUMANA INC. COMPENSATION RECOUPMENT POLICY (Effective February 21, 2019) I. Policy and Scope The Board adopts this recoupment policy under which, upon the occurrence of certain events, the Company’s Officers may be required to repay to the Company certain cash and equity incentive-based compensation covered below. Upon the occurrence of a Triggering Event, the Administrator may, in its sole discretion, after evaluating the associated costs and benefits, recover all or any portion of the Recoverable Incentive paid to a Covered Employee during the Applicable Period. In addition, the Administrator may, in its sole discretion and in the reasonable exercise of its business judgment, determine whether and to what extent additional action is appropriate to address the circumstances surrounding such Triggering Event so as to minimize the likelihood of any recurrence and to impose such other discipline as it deems appropriate. II. Definitions For the purposes of this Policy, the following terms have the following meanings: A. “Administrator” means the Board, the Compensation Committee or such other committee of the Board that, at the relevant time, has authority for making determinations as to the compensation of senior executives. B. “Applicable Period” means (i) with respect to a Restatement, the three-year period preceding the date on which the Company is required to prepare a Restatement and (ii) with respect to Improper Conduct, the three-year period preceding the date on which the Administrator determines that Improper Conduct has occurred. C. “Board” means the Board of Directors of the Company. D. “Company” means Humana Inc. E. “Compensation Committee” means the Organization & Compensation Committee of the Board. F. “Covered Employee” means any Officer of the Company. G. “Improper Conduct” means the following conduct that, in the sole discretion of the Administrator, is likely to cause or has caused material financial, operational, or reputational harm to the Company, materially disrupt, damage, impair or interfere with the business of the Company or its affiliates, or have a significant, adverse reputational or economic impact on the Company or any of its affiliates or divisions: i. the commission of an act of fraud, misappropriation or embezzlement in the course of employment;

ii. the commission of a criminal act, whether or not in the workplace, that in the Administrator’s sole discretion, constitutes a felony or crime of comparable magnitude; iii. the material violation of a non-compete, non-solicitation, or confidentiality agreement; or iv. the willful and material breach of a Covered Employee’s obligations under the Company’s code of conduct relating to compliance with law or regulation H. “Incentive-Based Compensation” refers to each award of and payment (whether in cash, Company stock, or otherwise) of incentive compensation and other compensation the earning, payment or amount of which depends on the performance of the Company or any individual, product, service, or business unit, including but not limited to annual incentive compensation, awards under commission plans, and awards under the Company’s stock incentive plans, including but not limited to gains from the sale or disposition of securities. I. “Officer” shall include any individual who serves as a current or former “Officer” within the meaning set forth in Rule 16a-1(f) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as applied by the Administrator from time to time. J. “Policy” means this Humana Inc. Compensation Recoupment Policy. K. “Recoupment” means, to the extent permissible under law, offset from amounts otherwise credited, payable, or due, forfeiture or cancellation of awards or amounts deferred, and/or recovery or repayment, as applicable. L. “Recoverable Incentive” means (i) with respect to Recoupment relating to a Restatement, the amount of any Incentive-Based Compensation paid or provided during the Applicable Period that exceeds the amount or value that the Administrator determines, in its sole discretion, would have been payable or received in respect of Incentive-Based Compensation had the revised financial statement(s) reflected in the Restatement been applied to determine the Incentive-Based Compensation or been available to the market at the time such Incentive-Based Compensation was paid or (ii) with respect to Improper Conduct, any Incentive-Based Compensation received by the Covered Employee during and after the period in which such Improper Conduct occurred. In no event will the amount of the Recoverable Incentive exceed the total amount of Incentive- Based Compensation paid or granted during the Applicable Period. M. “Restatement” means the Company being required to undertake any material restatement (occurring after the effective date of this Policy) of any of its financial statements that have been filed with the Securities and Exchange Commission (the “SEC”) under the Exchange Act or the Securities Act of 1933, as amended. N. “Triggering Event” means either a Restatement or Improper Conduct by a Covered Employee. III. Administrator Discretion In exercising the discretion afforded to it under this Policy, the Administrator may consider any and all facts it considers relevant under all of the circumstances, including without limitation: (A) whether or not the Covered Employee engaged in Improper Conduct; (B) the likelihood of success of any recovery under this Policy under governing law as compared to the cost and effort involved; (C) whether the assertion of a claim may prejudice the interests of the Company, including in any related proceeding or investigation; (D) the passage of time since the occurrence of the Triggering Event; and (E) any pending legal proceeding

relating to the Triggering Event. Subject to applicable law, the Administrator may seek to recoup any Recoverable Incentive by requiring any affected Covered Employee to repay such amount to the Company, by set-off, by forfeiture, by reducing future compensation, or by such other means or combination of means as the Administrator, in its sole discretion, determines to be appropriate. The Administrator has sole and absolute discretion with respect to interpretation and enforcement of this Policy and any interpretations or determinations made by the Administrator shall be final and binding on all affected individuals. This Policy will be interpreted and enforced, and appropriate disclosures and filings will be made, in a manner that is consistent with any applicable rules or regulations adopted by the SEC and the New York Stock Exchange pursuant to Section 10D of the Exchange Act, and any other applicable law (collectively, the “Applicable Rules”). To the extent the Applicable Rules require the Company to recover Incentive-Based Compensation in additional circumstances besides those specified herein, nothing in this Policy shall be deemed to restrict the right of the Company to recover Incentive-Based Compensation to the fullest extent required by the Applicable Rules. This Policy shall be deemed to be automatically amended, as of the date the Applicable Rules become effective with respect to the Company, to allow the Company to recover Incentive-Based Compensation to the extent required for this Policy to comply with the Applicable Rules. IV. Recoupment A. Restatement: In the event of a Restatement, the Administrator may recover up to the amount of the Recoverable Incentive received during the Applicable Period if, in the Administrator’s judgment and determination, the Covered Employee engaged in fraud, negligence or other misconduct that contributed to the need for the Restatement. For the avoidance of doubt, Restatement does not include any restatement required due to changes in accounting rules or standards or changes in applicable law, or retrospective revisions or reclassifications made to reflect a change in the structure or operations of the Company. B. Improper Conduct: In the event that a Covered Employee engages in Improper Conduct, the Administrator may recover up to the amount of the Recoverable Incentive during the Applicable Period. V. Method of Recovery The Administrator may effect Recoupment in any manner consistent with applicable law including, but not limited to, (a) seeking reimbursement of all or part of an award previously paid, (b) cancelling prior awards, whether vested or unvested or paid or unpaid, (c) cancelling or setting-off against planned future grants, and (d) any other method authorized by applicable law or contract. VII. Amendment and Termination The Administrator may, from time to time, suspend, discontinue, revise, amend or terminate this Policy in any respect whatsoever. Nothing in this Policy will be deemed to limit or restrict the Company from providing for recoupment, repayment and/or forfeiture of compensation (including Incentive-Based Compensation) under circumstances not set forth in this Policy. In all events, this Policy shall immediately terminate upon the consummation of a Change in Control (as defined in the Company’s Change in Control Policy). VIII. Effective Date This Policy shall be effective as of the date it is adopted by the Board (the “Effective Date”) and shall apply to compensation that is awarded or granted to Covered Employees on or after that date (and shall not apply to compensation that is granted or awarded before that date)

EX-21

EXHIBIT 21

HUMANA INC.

SUBSIDIARY LIST

ARKANSAS

1. Humana Regional Health Plan, Inc.

CALIFORNIA

1. Humana EAP and Work-Life Services of California, Inc.

2. Humana Health Plan of California, Inc.

CONNECTICUT

1. SeniorBridge Family Companies (CT), Inc.

DELAWARE

1. Atlantis Physician Group, LLC

2. CDO 1, LLC

3. CDO 2, LLC

4. CompBenefits Corporation

5. CompBenefits Direct, Inc.

6. Emphesys, Inc.

7. Go365, LLC

8. Health Value Management, Inc.

9. HUM Provider Holdings, LLC

10. Humana at Home, Inc.

11. Humana Digital Health and Analytics Platform Services, Inc.

12. Humana Government Business, Inc.

13. Humana Inc.

14. Humana Innovation Enterprises, Inc.

15. Humana Pharmacy, Inc.

16. Humana Veterans Healthcare Services, Inc.

17. Humana WellWorks LLC

18. HumanaDental, Inc.

19. MCCI Group Holdings, LLC

20. MCCI Holdings, LLC

21. North Region Providers, LLC

22. Primary Care Holdings, Inc.

23. Primary Care Holdings II, LLC

24. Primary Care Specialists of the Palm Beaches, LLC

25. Transcend Population Health Management, LLC

26. Transcend Population Health Management II, LLC

FLORIDA

1. 154th Street Medical Plaza, Inc.

2. 54th Street Medical Plaza, Inc.

3. American Eldercare of North Florida, LLC

4. American Eldercare, Inc.

5. CAC Medical Center Holdings, Inc.

6. CAC-Florida Medical Centers, LLC

7. Care Partners Home Care, LLC

8. CarePlus Health Plans, Inc.

9. CompBenefits Company

10. Complex Clinical Management, Inc.

11. Continucare Corporation

12. Continucare MDHC, LLC

13. Continucare Medical Management, Inc.

14. Continucare MSO, Inc.

15. Family Physicians of Winter Park, Inc.

16. FPG Acquisition Corp.

17. FPG Acquisition Holdings Corp.

18. FPG Holding Company, LLC

19. FPG Senior Services, LLC

20. HUM-e-FL, Inc.

21. Humana At Home 1, Inc.

22. Humana Dental Company

23. Humana Health Insurance Company of Florida, Inc.

24. Humana Medical Plan, Inc.

25. MCCI Specialty, LLC

26. MCCI/Lifetime of Aventura, LLC

27. METCARE of Florida, Inc.

28. Metropolitan Health Networks, Inc.

29. Naples Health Care Specialists, LLC

30. Nursing Solutions, LLC

31. Partners in Integrated Care, Inc.

32. RMA Medical Centers of Florida, LLC

33. RMA Medical Group of Florida, LLC

34. SeniorBridge Family Companies (FL), Inc.

35. SeniorBridge-Florida, LLC

GEORGIA

1. Humana Employers Health Plan of Georgia, Inc.

ILLINOIS

1. CompBenefits Dental, Inc.

2. Dental Care Plus Management, Corp.

3. Humana Benefit Plan of Illinois, Inc.

4. Humana Healthcare Research, Inc.

INDIANA

1. SeniorBridge Family Companies (IN), Inc.

KENTUCKY

1. 516-526 West Main Street Condominium Council of Co-Owners, Inc.

2. CHA HMO, Inc.

3. CHA Service Company

4. Humana Active Outlook, Inc.

5. Humana Health Plan, Inc.

6. Humana Insurance Company of Kentucky

7. Humana MarketPOINT, Inc.

8. Humana Pharmacy Solutions, Inc.

9. Humco, Inc.

10. Preservation on Main, Inc.

11. The Dental Concern, Inc.

LOUISIANA

1. Humana Health Benefit Plan of Louisiana, Inc.

MICHIGAN

1. Humana Medical Plan of Michigan, Inc.

MISSOURI

1. SeniorBridge Family Companies (MO), Inc.

NEW YORK

1. Harris, Rothenberg International Inc.

2. Humana Health Company of New York, Inc.

3. Humana Insurance Company of New York

4. SeniorBridge Family Companies (NY), Inc.

OHIO

1. Humana Health Plan of Ohio, Inc.

2. Hummingbird Coaching Systems LLC

PENNSYLVANIA

1. Humana Medical Plan of Pennsylvania, Inc.

PUERTO RICO

1. Humana Health Plans of Puerto Rico, Inc.

2. Humana Insurance of Puerto Rico, Inc.

3. Humana Management Services of Puerto Rico, Inc.

4. Humana MarketPOINT of Puerto Rico, Inc.

TENNESSEE

1. Cariten Health Plan Inc.

2. PHP Companies, Inc.

3. Preferred Health Partnership, Inc.

TEXAS

1. CompBenefits Insurance Company

2. DentiCare, Inc.

3. Emphesys Insurance Company

4. Humana At Home (Dallas), Inc.

5. Humana At Home (Houston), Inc.

6. Humana At Home (San Antonio), Inc.

7. Humana At Home (TLC), Inc.

8. Humana Behavioral Health, Inc.

9. Humana Health Plan of Texas, Inc.

10. Medical Care Consortium Incorporated of Texas

11. ROHC, L.L.C.

12. Texas Dental Plans, Inc.

UTAH

1. Humana Medical Plan of Utah, Inc.

VERMONT

1. Managed Care Indemnity, Inc.

WASHINGTON

1. Arcadian Health Plan, Inc.

WISCONSIN

1. CareNetwork, Inc.

2. Humana Insurance Company

3. Humana Wisconsin Health Organization Insurance Corporation

4. HumanaDental Insurance Company

5. Independent Care Health Plan

EX-23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on FormS-8 (No.33-49305, No. 333-04435, No. 333-57095, No. 333-86801, No. 333-41408, No. 333-86280, No. 333-105622, No. 333-134887, No. 333-162747, No. 333-171616, and No. 333-175350) and S-3 (No. 333-223554) of Humana Inc. of our report dated February 21, 2019 relating to the financial statements and financial statement schedulesand the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Louisville, Kentucky

February 21, 2019

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO SECTION 302 OF SARBANES-OXLEY ACT OF 2002

I, Bruce D. Broussard, principal executive officer of Humana Inc., certify that:

1. I have reviewed this annual report on Form 10-K of Humana Inc.;

2. Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 21, 2019
Signature:	/s/ BRUCE D. BROUSSARD
	Bruce D. Broussard Principal Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO SECTION 302 OF SARBANES-OXLEY ACT OF 2002

I, Brian A. Kane, principal financial officer of Humana Inc., certify that:

1. I have reviewed this annual report on Form 10-K of Humana Inc.;

2. Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 21, 2019
Signature:	/s/ BRIAN A. KANE
	Brian A. Kane Principal Financial Officer

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Humana Inc. (the “Company”) on Form 10-K for the period ended December 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned hereby certifies, pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Sec. 906 of the Sarbanes-Oxley Act of 2002, in his capacity as an officer of Humana Inc., that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ BRUCE D. BROUSSARD

Bruce D. Broussard

President and Chief Executive Officer,

Director (Principal Executive Officer)

February 21, 2019

/s/ BRIAN A. KANE

Brian A. Kane

Chief Financial Officer
(Principal Financial Officer)

February 21, 2019

A signed original of this written statement required by Section 906 has been provided to Humana Inc. and will be retained by Humana Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Jan. 31, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	HUMANA INC
Trading Symbol	HUM
Entity Central Index Key	0000049071
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		135,566,909
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Public Float			$ 41,129,697,151

XML

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 2,343	$ 4,042
Investment securities	10,026	9,557
Receivables, less allowance for doubtful accounts of $79 in 2018 and $96 in 2017	1,015	854
Other current assets	3,564	2,949
Total current assets	16,948	17,402
Property and equipment, net	1,735	1,584
Long-term investment securities	411	2,745
Equity method investment in Kindred at Home	1,047	0
Goodwill	3,897	3,281
Other long-term assets	1,375	2,166
Total assets	25,413	27,178
Current liabilities:
Benefits payable	4,862	4,668
Trade accounts payable and accrued expenses	3,067	4,069
Book overdraft	171	141
Unearned revenues	283	378
Short-term debt	1,694	150
Total current liabilities	10,077	9,406
Long-term debt	4,375	4,770
Future policy benefits payable	219	2,923
Other long-term liabilities	581	237
Total liabilities	15,252	17,336
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	0	0
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,594,841 shares issued at December 31, 2018 and 198,572,458 shares issued at December 31, 2017	33	33
Capital in excess of par value	2,535	2,445
Retained earnings	15,072	13,670
Accumulated other comprehensive (loss) income	(159)	19
Treasury stock, at cost, 63,028,169 shares at December 31, 2018 and 60,893,762 shares at December 31, 2017	(7,320)	(6,325)
Total stockholders’ equity	10,161	9,842
Total liabilities and stockholders’ equity	$ 25,413	$ 27,178

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 79	$ 96
Preferred stock, par (in USD per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par (in USD per share)	$ 0.1667	$ 0.1667
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	198,594,841	198,572,458
Treasury stock (in shares)	63,028,169	60,893,762

XML

Consolidated Statements Of Income - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Premiums									$ 54,941	$ 52,380	$ 53,021
Services									1,457	982	969
Investment income									514	405	389
Total revenues	$ 14,168	$ 14,206	$ 14,259	$ 14,279	$ 13,189	$ 13,282	$ 13,534	$ 13,762	56,912	53,767	54,379
Operating expenses:
Benefits									45,882	43,496	45,007
Operating costs									7,525	6,567	7,173
Merger termination fee and related costs, net									0	(936)	104
Depreciation and amortization									405	378	354
Total operating expenses									53,812	49,505	52,638
Income from operations									3,100	4,262	1,741
Loss on sale of business									786	0	0
Interest expense									218	242	189
Other expense, net									33	0	0
Income (loss) before income taxes and equity in net earnings	436	901	19	707	490	799	1,042	1,689	2,063	4,020	1,552
Provision for income taxes									391	1,572	938
Equity in net earnings of Kindred at Home									11	0	0
Net income	$ 355	$ 644	$ 193	$ 491	$ 184	$ 499	$ 650	$ 1,115	$ 1,683	$ 2,448	$ 614
Basic earnings per common share (in USD per share)	$ 2.60	$ 4.68	$ 1.40	$ 3.56	$ 1.30	$ 3.46	$ 4.49	$ 7.54	$ 12.24	$ 16.94	$ 4.11
Diluted earnings per common share (in USD per share)	$ 2.58	$ 4.65	$ 1.39	$ 3.53	$ 1.29	$ 3.44	$ 4.46	$ 7.49	$ 12.16	$ 16.81	$ 4.07

XML

Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 355	$ 644	$ 193	$ 491	$ 184	$ 499	$ 650	$ 1,115	$ 1,683	$ 2,448	$ 614
Other comprehensive income (loss):
Change in gross unrealized investment losses/gains									(189)	149	(101)
Effect of income taxes									51	(55)	38
Total change in unrealized investment gains/losses, net of tax									(138)	94	(63)
Reclassification adjustment for net realized gains included in investment income									(53)	(14)	(96)
Effect of income taxes									17	5	35
Total reclassification adjustment, net of tax									(36)	(9)	(61)
Other comprehensive (loss) income, net of tax									(174)	85	(124)
Comprehensive income attributable to our equity method investment in Kindred at Home									(4)	0	0
Comprehensive income									$ 1,505	$ 2,533	$ 490

XML

Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Capital In Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balances at Dec. 31, 2015	$ 10,346	$ 33	$ 2,530	$ 11,017	$ 58	$ (3,292)
Balances (in shares) at Dec. 31, 2015		198,372
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	614			614
Other comprehensive income (loss)	(124)				(124)
Common stock repurchases	(104)					(104)
Dividends and dividend equivalents	(177)			(177)
Stock-based compensation	115		115
Restricted stock unit vesting	0		(98)			98
Restricted stock unit vesting (in shares)		13
Stock option exercises	13		13
Stock option exercises (in shares)		110
Stock option and restricted stock tax benefit	2		2
Balances at Dec. 31, 2016	10,685	$ 33	2,562	11,454	(66)	(3,298)
Balances (in shares) at Dec. 31, 2016		198,495
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,448			2,448
Other comprehensive income (loss)	85				85
Common stock repurchases	(3,365)		(200)			(3,165)
Dividends and dividend equivalents	(232)			(232)
Stock-based compensation	157		157
Restricted stock unit vesting	0		(138)			138
Restricted stock unit vesting (in shares)		0
Stock option exercises	64		64
Stock option exercises (in shares)		77
Balances at Dec. 31, 2017	9,842	$ 33	2,445	13,670	19	(6,325)
Balances (in shares) at Dec. 31, 2017		198,572
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,683			1,683
Other comprehensive income (loss)	(174)
Other comprehensive loss	(182)			(4)	(178)
Common stock repurchases	(1,090)		50			(1,140)
Dividends and dividend equivalents	(277)			(277)
Stock-based compensation	137		137
Restricted stock unit vesting	0		(145)			145
Stock option exercises	$ 48		48
Stock option exercises (in shares)	320	23
Balances at Dec. 31, 2018	$ 10,161	$ 33	$ 2,535	$ 15,072	$ (159)	$ (7,320)
Balances (in shares) at Dec. 31, 2018		198,595

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Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 1,683	$ 2,448	$ 614
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on sale of business	786	0	0
Net realized capital gains	(90)	(14)	(96)
Equity in net earnings of Kindred at Home	(11)	0	0
Stock-based compensation	137	157	115
Depreciation	444	410	388
Amortization	90	75	77
Provision (benefit) for deferred income taxes	194	132	(71)
Provision for doubtful accounts	36	20	39
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	(200)	406	(158)
Other assets	(484)	(582)	426
Benefits payable	252	105	(413)
Other liabilities	(676)	641	937
Unearned revenues	(95)	98	(84)
Other	107	155	162
Net cash provided by operating activities	2,173	4,051	1,936
Cash flows from investing activities
Acquisitions, net of cash acquired	(354)	(31)	(7)
Acquisition, equity method investment in Kindred at Home	(1,095)	0	0
Cash transferred in sale of business	(805)	0	0
Purchases of property and equipment	(612)	(524)	(527)
Purchases of investment securities	(4,687)	(6,265)	(6,566)
Maturities of investment securities	972	1,111	1,426
Proceeds from sales of investment securities	3,494	2,768	4,312
Net cash used in investing activities	(3,087)	(2,941)	(1,362)
Cash flows from financing activities
(Withdrawals) receipts from contract deposits, net	(640)	1,823	1,093
Proceeds from issuance of senior notes, net	0	1,779	0
Proceeds from issuance (repayments) of commercial paper, net	485	(153)	(2)
Proceeds from term loan	1,000	0	0
Repayment of term loan	(350)	0	0
Repayment of long-term debt	0	(800)	0
Common stock repurchases	(1,090)	(3,365)	(104)
Dividends paid	(265)	(220)	(177)
Change in book overdraft	30	(71)	(89)
Proceeds from stock option exercises and other, net	45	62	11
Net cash (used in) provided by financing activities	(785)	(945)	732
(Decrease) increase in cash and cash equivalents	(1,699)	165	1,306
Cash and cash equivalents at beginning of year	4,042	3,877	2,571
Cash and cash equivalents at end of year	2,343	4,042	3,877
Supplemental cash flow disclosures:
Interest payments	195	216	185
Income tax payments, net	631	1,498	916
Details of businesses acquired in purchase transactions:
Fair value of assets acquired, net of cash acquired	392	31	7
Less: Fair value of liabilities assumed	(38)	0	0
Cash paid for acquired businesses, net of cash acquired	$ 354	$ 31	$ 7

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REPORTING ENTITY

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

REPORTING ENTITY

REPORTING ENTITY

Nature of Operations

Humana Inc., headquartered in Louisville, Kentucky, is a leading health and well-being company committed to helping our millions of medical and specialty members achieve their best health. Our successful history in care delivery and health plan administration is helping us create a new kind of integrated care with the power to improve health and well‐being and lower costs. Our efforts are leading to a better quality of life for people with Medicare, families, individuals, military service personnel, and communities at large. To accomplish that, we support physicians and other health care professionals as they work to deliver the right care in the right place for their patients, our members. Our range of clinical capabilities, resources and tools, such as in‐home care, behavioral health, pharmacy services, data analytics and wellness solutions, combine to produce a simplified experience that makes health care easier to navigate and more effective. References throughout these notes to consolidated financial statements to “we,” “us,” “our,” “Company,” and “Humana,” mean Humana Inc. and its subsidiaries. We derived approximately 81% of our total premiums and services revenue from contracts with the federal government in 2018, including 15% related to our federal government contracts with the Centers for Medicare and Medicaid Services, or CMS, to provide health insurance coverage for individual Medicare Advantage members in Florida. CMS is the federal government’s agency responsible for administering the Medicare program.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

Our financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America. Our consolidated financial statements include the accounts of Humana Inc. and subsidiaries that the Company controls, including variable interest entities associated with medical practices for which we are the primary beneficiary. We do not own many of our medical practices but instead enter into exclusive management agreements with the affiliated Professional Associations, or P.A.s, that operate these medical practices. Based upon the provisions of these agreements, these affiliated P.A.s are variable interest entities and we are the primary beneficiary, and accordingly we consolidate the affiliated P.A.s. All significant intercompany balances and transactions have been eliminated.

The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America requires us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The areas involving the most significant use of estimates are the estimation of benefits payable, the impact of risk adjustment provisions related to our Medicare contracts, the valuation and related impairment recognition of investmentsecurities, and the valuation and related impairment recognition of long-lived assets, including goodwill. These estimates are based on knowledge of current events and anticipated future events, and accordingly, actual results may ultimately differ materially from those estimates.

Workforce Optimization

During the third quarter of 2017, we initiated a voluntary early retirement program and an involuntary workforce reduction program. These programs impacted approximately 3,600 associates, or 7.8% of our workforce. As a result, in 2017 we recorded charges of $148 million, or $0.64 per diluted common share. At December 31, 2017, $140 million was classified as a current liability, included in our consolidated balance sheet in the trade accounts payable and accrued expenses line. Payments under these programs are being made upon termination during the early retirement or severance pay period. The remaining workforce optimization liability at  December 31, 2018, was $12 million and is expected to be paid in 2019.

Aetna Merger

On February 16, 2017, under the terms of the Agreement and Plan of Merger, or Merger Agreement, with Aetna Inc., and certain wholly owned subsidiaries of Aetna Inc., which we collectively refer to as Aetna, we received a breakup fee of $1 billion from Aetna, which is included in our consolidated statement of income in the line captioned "Merger termination fee and related costs, net."

Health Care Reform

The Patient Protection and Affordable Care Act and The Health Care and Education Reconciliation Act of 2010 (which we collectively refer to as the Health Care Reform Law) enacted significant reforms to various aspects of the U.S. health insurance industry. Certain of these reforms became effective January 1, 2014, including an annual insurance industry premium-based fee and the establishment of federally-facilitated or state-based exchanges. Operating results for our individual commercial medical business compliant with the Health Care Reform Law were challenged primarily due to unanticipated modifications in the program subsequent to the passing of the Health Care Reform Law, resulting in higher covered population morbidity and the ensuing enrollment and claims issues causing volatility in claims experience. As a result of these and other factors, we exited our individual commercial medical business effective January 1, 2018.

The annual premium-based fee on health insurers is not deductible for tax purposes. We estimate a liability for the health insurance industry fee and record it in full once qualifying insurance coverage is provided in the applicable calendar year in which the fee is payable with a corresponding deferred cost that is amortized ratably to expense over the same calendar year. We record the liability for the health insurance industry fee in trade accounts payable and accrued expenses and record the deferred cost in other current assets in our consolidated financial statements. We pay the health insurance industry fee in September or October of each year. The Consolidated Appropriations Act enacted on December 18, 2015, included a one-time one year suspension in 2017 of the health insurance industry fee. In 2018, we paid the federal government $1.04 billion for the annual health insurance industry fee attributed to calendar year 2018. In 2016, we paid the federal government $916 million for the annual health insurance industry fee attributed to calendar year 2016. The Continuing Resolution bill, H.R. 195, enacted on January 22, 2018, included a one year suspension in 2019 of the health insurance industry fee, but under current law, the fee is scheduled to resume in calendar year 2020.

Cash and Cash Equivalents

Cash and cash equivalents include cash, time deposits, money market funds, commercial paper, other money market instruments, and certain U.S. Government securities with an original maturity of three months or less. Carrying value approximates fair value due to the short-term maturity of the investments.

Investment Securities

Investment securities, which consist entirely of debt securities, have been categorized as available for sale and, as a result, are stated at fair value. Investment securities available for current operations are classified as current assets. Investment securities available for our long-term insurance products and professional liability funding requirements, as well as restricted statutory deposits, are classified as long-term assets. For the purpose of determining gross realized gains and losses, which are included as a component of investment income in the consolidated statements of income, the cost of investment securities sold is based upon specific identification. Unrealized holding gains and losses, net of applicable deferred taxes, are included as a component of stockholders’ equity and comprehensive income until realized from a sale or other-than-temporary impairment.

Under the other-than-temporary impairment model for debt securities held, we recognize an impairment loss in income in an amount equal to the full difference between the amortized cost basis and the fair value when we have the intent to sell the debt security or it is more likely than not we will be required to sell the debt security before recovery of our amortized cost basis. However, if we do not intend to sell the debt security, we evaluate the expected cash flows to be received as compared to amortized cost and determine if a credit loss has occurred. In the event of a credit loss, only the amount of the impairment associated with the credit loss is recognized currently in income with the remainder of the loss recognized in other comprehensive income.

When we do not intend to sell a security in an unrealized loss position, potential other-than-temporary impairment is considered using a variety of factors, including the length of time and extent to which the fair value has been less than cost; adverse conditions specifically related to the industry, geographic area or financial condition of the issuer or underlying collateral of a security; payment structure of the security; changes in credit rating of the security by the rating agencies; the volatility of the fair value changes; and changes in fair value of the security after the balance sheet date. For debt securities, we take into account expectations of relevant market and economic data. For example, with respect to mortgage and asset-backed securities, such data includes underlying loan level data and structural features such as seniority and other forms of credit enhancements. A decline in fair value is considered other-than-temporary when we do not expect to recover the entire amortized cost basis of the security. We estimate the amount of the credit loss component of a debt security as the difference between the amortized cost and the present value of the expected cash flows of the security. The present value is determined using the best estimate of future cash flows discounted at the implicit interest rate at the date of purchase.

Receivables and Revenue Recognition

We generally establish one-year commercial membership contracts with employer groups, subject to cancellation by the employer group on 30-day written notice. Our Medicare contracts with CMS renew annually. Our military services contracts with the federal government and certain contracts with various state Medicaid programs generally are multi-year contracts subject to annual renewal provisions.

Premiums Revenue

We receive monthly premiums from the federal government and various states according to government specified payment rates and various contractual terms. We bill and collect premium from employer groups and members in our Medicare and other individual products monthly. Changes in premium revenues resulting from the periodic changes in risk-adjustment scores derived from medical diagnoses for our membership are estimated by projecting the ultimate annual premium and are recognized ratably during the year, with adjustments each period to reflect changes in the ultimate premium. Receivables or payables are classified as current or long-term in our consolidated balance sheet based on the timing of the expected settlement.

Premiums revenue is estimated by multiplying the membership covered under the various contracts by the contractual rates. Premiums revenue is recognized as income in the period members are entitled to receive services, and is net of estimated uncollectible amounts, retroactive membership adjustments, and adjustments to recognize rebates under the minimum benefit ratios required under the Health Care Reform Law. We estimate policyholder rebates by projecting calendar year minimum benefit ratios for the small group and large group markets, as defined by the Health Care Reform Law using a methodology prescribed by HHS, separately by state and legal entity. Medicare Advantage products are also subject to minimum benefit ratio requirements under the Health Care Reform Law. Estimated calendar year rebates recognized ratably during the year are revised each period to reflect current experience. Retroactive membership adjustments result from enrollment changes not yet processed, or not yet reported by an employer group or the government. We routinely monitor the collectibility of specific accounts, the aging of receivables, historical retroactivity trends, estimated rebates, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. Premiums received prior to the service period are recorded as unearned revenues.

Medicare Part D

We cover prescription drug benefits in accordance with Medicare Part D under multiple contracts with CMS. The payments we receive monthly from CMS and members, which are determined from our annual bid, represent amounts for providing prescription drug insurance coverage. We recognize premiums revenue for providing this insurance coverage ratably over the term of our annual contract. Our CMS payment is subject to risk sharing through the Medicare Part D risk corridor provisions. In addition, receipts for reinsurance and low-income cost subsidies as well as receipts for certain discounts on brand name prescription drugs in the coverage gap represent payments for prescription drug costs for which we are not at risk.

The risk corridor provisions compare costs targeted in our bids to actual prescription drug costs, limited to actual costs that would have been incurred under the standard coverage as defined by CMS. Variances exceeding certain thresholds may result in CMS making additional payments to us or require us to refund to CMS a portion of the premiums we received. As risk corridor provisions are considered in our overall annual bid process, we estimate and recognize an adjustment to premiums revenue related to these provisions based upon pharmacy claims experience. We record a receivable or payable at the contract level and classify the amount as current or long-term in our consolidated balance sheets based on the timing of expected settlement.

Reinsurance and low-income cost subsidies represent funding from CMS in connection with the Medicare Part D program for which we assume no risk. Reinsurance subsidies represent funding from CMS for its portion of prescription drug costs which exceed the member’s out-of-pocket threshold, or the catastrophic coverage level. Low-income cost subsidies represent funding from CMS for all or a portion of the deductible, the coinsurance and co-payment amounts above the out-of-pocket threshold for low-income beneficiaries. Monthly prospective payments from CMS for reinsurance and low-income cost subsidies are based on assumptions submitted with our annual bid. A reconciliation and related settlement of CMS’s prospective subsidies against actual prescription drug costs we paid is made after the end of the year. The Health Care Reform Law mandates consumer discounts of 50% on brand name prescription drugs for Part D plan participants in the coverage gap. These discounts are funded by CMS and pharmaceutical manufacturers while we administer the application of these funds. We account for these subsidies and discounts as a deposit in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2018, subsidy and discount payments of $10.3 billion exceeded reimbursements of $9.6 billion by $0.7 billion. For 2017, subsidy and discount reimbursements of $12.1 billion exceeded payments of $10.2 billion by $1.9 billion. For 2016, subsidy and discount reimbursements of $11.1 billion exceeded payments of $10.0 billion by $1.1 billion. We do not recognize premiums revenue or benefit expenses for these subsidies or discounts. Receipt and payment activity is accumulated at the contract level and recorded in our consolidated balance sheets in other current assets or trade accounts payable and accrued expenses depending on the contract balance at the end of the reporting period.

Settlement of the reinsurance and low-income cost subsidies as well as the risk corridor payment is based on a reconciliation made approximately9months after the close of each calendar year. Settlement with CMS for brand name prescription drug discounts is based on a reconciliation made approximately 14 to 18 months after the close of each calendar year. We continue to revise our estimates with respect to the risk corridor provisions based on subsequent period pharmacy claims data. See Note 7 for detail regarding amounts recorded to our consolidated balance sheets related to the risk corridor settlement and subsidies from CMS with respect to the Medicare Part D program.

Services Revenue

Patient services revenue

Patient services include injury and illness care and related services as well as other healthcare services related to customer needs or as required by law. Patient services revenues are recognized in the period services are provided to the customer and are net of contractual allowances.

Administrative services fees

Administrative services fees cover the processing of claims, offering access to our provider networks and clinical programs, and responding to customer service inquiries from members of self-funded groups. Revenues from providing administration services, also known as administrative services only, or ASO, are recognized in the period services are performed and are net of estimated uncollectible amounts. ASO fees are estimated by multiplying the membership covered under the various contracts by the contractual rates. Under ASO contracts, self-funded employers retain the risk of financing substantially all of the cost of health benefits. However, many ASO customers purchase stop loss insurance coverage from us to cover catastrophic claims or to limit aggregate annual costs. Accordingly, we have recorded premiums revenue and benefits expense related to these stop loss insurance contracts. We routinely monitor the collectibility of specific accounts, the aging of receivables, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. ASO fees received prior to the service period are recorded as unearned revenues.

Under our TRICARE contracts with the Department of Defense (DoD) we provide administrative services, including offering access to our provider networks and clinical programs, claim processing, customer service, enrollment, and other services, while the federal government retains all of the risk of the cost of health benefits. We account for revenues under our contracts net of estimated health care costs similar to an administrative services fee only agreement. Our contracts include fixed administrative services fees and incentive fees and penalties. Administrative services fees are recognized as services are performed. 

Our TRICARE members are served by both in-network and out-of-network providers in accordance with our contracts. We pay health care costs related to these services to the providers and are subsequently reimbursed by the DoD for such payments. We account for the payments of the federal government’s claims and the related reimbursements under deposit accounting in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2018, health care cost reimbursements and payments were each approximately $5.6 billion, with reimbursements exceeding payments by $38 million for the year. For 2017, health care cost reimbursements and payments were each approximately$3.4 billion, with reimbursements exceeding payments by $11 million for the year. For 2016, health care cost reimbursements and payments were each approximately $3.3 billion with payments exceeding reimbursements by $25 million for the year.

Receivables

Receivables, including premium receivables, patient services revenue receivables, and ASO fee receivables, are shown net of allowances for estimated uncollectible accounts, retroactive membership adjustments, and contractual allowances.

At December 31, 2018 and 2017, accounts receivable related to services were $123 million and $180 million, respectively. For the year ended December 31, 2018, we had no material bad-debt expense and there were no material contract assets, contract liabilities or deferred contract costs recorded on the consolidated balance sheet at December 31, 2018.

For the year ended December 31, 2018, revenue recognized from performance obligations related to prior periods (for example, due to changes in transaction price), was not material. Further, revenue expected to be recognized in any future year related to remaining performance obligations was not material.

Other Current Assets

Other current assets includes amounts associated with Medicare Part D as discussed above and in Note 7, rebates due from pharmaceutical manufacturers and other amounts due within one year. We accrue pharmaceutical rebates as they are earned based on contractual terms and usage of the product. The balance of pharmaceutical rebates receivable was $1.3 billion at December 31, 2018 and $1.2 billion at December 31, 2017.

Policy Acquisition Costs

Policy acquisition costs are those costs that relate directly to the successful acquisition of new and renewal insurance policies. Such costs include commissions, costs of policy issuance and underwriting, and other costs we incur to acquire new business or renew existing business. We expense policy acquisition costs related to our employer-group prepaid health services policies as incurred. These short-duration employer-group prepaid health services policies typically have a 1-year term and may be canceled upon 30 days notice by the employer group.

Life insurance, annuities, certain health and other supplemental, and, prior to the sale of our KMG subsidiary in 2018, long term care policies sold to individuals are accounted for as long-duration insurance products because they are expected to remain in force for an extended period beyond one year and premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. As a result, we defer policy acquisition costs, primarily consisting of commissions, and amortize them over the estimated life of the policies in proportion to premiums earned. Deferred acquisition costs are reviewed to determine if they are recoverable from future income. See Note 18.

Long-Lived Assets

Property and equipment is recorded at cost. Gains and losses on sales or disposals of property and equipment are included in operating costs. Certain costs related to the development or purchase of internal-use software are capitalized. Depreciation is computed using the straight-line method over estimated useful lives ranging from 3 to 10 years for equipment, 3 to 5 years for computer software, and 10 to 20 years for buildings. Improvements to leased facilities are depreciated over the shorter of the remaining lease term or the anticipated life of the improvement.

We periodically review long-lived assets, including property and equipment and definite-lived intangible assets, for impairment whenever adverse events or changes in circumstances indicate the carrying value of the asset may not be recoverable. Losses are recognized for a long-lived asset to be held and used in our operations when the undiscounted future cash flows expected to result from the use of the asset are less than its carrying value. We recognize an impairment loss based on the excess of the carrying value over the fair value of the asset. A long-lived asset held for sale is reported at the lower of the carrying amount or fair value less costs to sell. Depreciation expense is not recognized on assets held for sale. Losses are recognized for a long-lived asset to be abandoned when the asset ceases to be used. In addition, we periodically review the estimated lives of all long-lived assets for reasonableness.

Equity Method Investments

We use the equity method of accounting for equity investments in companies where we are able to exercise significant influence, but not control, over operating and financial policies of the investee. Judgment regarding the level of influence over each equity method investment includes considering key factors such as our ownership interest, representation on the board of directors, organizational structure, participation in policy-making decisions and material intra-entity transactions.

Generally, under the equity method, original investments in these entities are recorded at cost and subsequently adjusted by our share of equity in income or losses after the date of acquisition as well as capital contributions to and distributions from these companies. Our proportionate share of the net income or loss of these companies is included in consolidated net income. Investment amounts in excess of our share of an investee's net assets are amortized over the life of the related asset creating the excess. Excess goodwill is not amortized.

We evaluate equity method investments for impairment whenever events or changes in circumstances indicate that the carrying amount of the investment might not be recoverable. Factors considered by us when reviewing an equity method investment for impairment include the length of time (duration) and the extent (severity) to which the fair value of the equity method investment has been less than carrying value, the investee’s financial condition and near-term prospects and the intent and ability to hold the investment for a period of time sufficient to allow for anticipated recovery. An impairment that is other-than-temporary is recognized in the period identified.

See Note 4 for further information.

Goodwill and Definite-Lived Intangible Assets

Goodwill represents the unamortized excess of cost over the fair value of the net tangible and other intangible assets acquired. We are required to test at least annually for impairment at a level of reporting referred to as the reporting unit, and more frequently if adverse events or changes in circumstances indicate that the asset may be impaired. A reporting unit either is our operating segments or one level below the operating segments, referred to as a component, which comprise our reportable segments. A component is considered a reporting unit if the component constitutes a business for which discrete financial information is available that is regularly reviewed by management. We aggregate the components of an operating segment into one reporting unit if they have similar economic characteristics. Goodwill is assigned to the reporting units that are expected to benefit from the specific synergies of the business combination.

We use the one-step process to review goodwill for impairment to determine both the existence and amount of goodwill impairment, if any. Impairment tests are performed, at a minimum, in the fourth quarter of each year supported by our long-range business plan and annual planning process. We rely on an evaluation of future discounted cash flows to determine fair value of our reporting units. The fair value of our reporting units with significant goodwill exceeded carrying amounts by a substantial margin. A 100 basis point increase in the discount rate would not have a significant impact on the amount of margin for any of our reporting units with significant goodwill, with the exception of our clinical and provider reporting units in our Healthcare Services segment. The margin on the clinical reporting unit would decline to less than 10% after factoring in a 100 basis point increase in the discount rate. The provider reporting unit, while not falling beneath this threshold, was closer than any of our other reporting units. The clinical and provider reporting units account for $524 million and $730 million, respectively, of goodwill. Impairment tests completed for 2018, 2017, and 2016 did not result in an impairment loss.

Definite-lived intangible assets primarily relate to acquired customer contracts/relationships and are included with other long-term assets in the consolidated balance sheets. Definite-lived intangible assets are amortized over the useful life generally using the straight-line method. We review definite-lived intangible assets for impairment under our long-lived asset policy.

Benefits Payable and Benefits Expense Recognition

Benefits expense includes claim payments, capitation payments, pharmacy costs net of rebates, allocations of certain centralized expenses and various other costs incurred to provide health insurance coverage to members, as well as estimates of future payments to hospitals and others for medical care and other supplemental benefits provided on or prior to the balance sheet date. Capitation payments represent monthly contractual fees disbursed to primary care and other providers who are responsible for providing medical care to members. Pharmacy costs represent payments for members’ prescription drug benefits, net of rebates from drug manufacturers. Receivables for such pharmacy rebates are included in other current assets in our consolidated balance sheets. Other supplemental benefits include dental, vision, and other supplemental health and financial protection products.

We estimate the costs of our benefits expense payments using actuarial methods and assumptions based upon claim payment patterns, medical cost inflation, historical developments such as claim inventory levels and claim receipt patterns, and other relevant factors, and record benefit reserves for future payments. We continually review estimates of future payments relating to claims costs for services incurred in the current and prior periods and make necessary adjustments to our reserves.

Benefits expense is recognized in the period in which services are provided and includes an estimate of the cost of services which have been incurred but not yet reported, or IBNR. Our reserving practice is to consistently recognize the actuarial best point estimate within a level of confidence required by actuarial standards. Actuarial standards of practice generally require a level of confidence such that the liabilities established for IBNR have a greater probability of being adequate versus being insufficient, or such that the liabilities established for IBNR are sufficient to cover obligations under an assumption of moderately adverse conditions. Adverse conditions are situations in which the actual claims are expected to be higher than the otherwise estimated value of such claims at the time of the estimate. Therefore, in many situations, the claim amounts ultimately settled will be less than the estimate that satisfies the actuarial standards of practice.

We develop our estimate for IBNR using actuarial methodologies and assumptions, primarily based upon historical claim experience. Depending on the period for which incurred claims are estimated, we apply a different method in determining our estimate. For periods prior to the most recent two months, the key assumption used in estimating our IBNR is that the completion factor pattern remains consistent over a rolling 12-month period after adjusting for known changes in claim inventory levels and known changes in claim payment processes. Completion factors result from the calculation of the percentage of claims incurred during a given period that have historically been adjudicated as of the reporting period. For the most recent two months, the incurred claims are estimated primarily from a trend analysis based upon per member per month claims trends developed from our historical experience in the preceding months, adjusted for known changes in estimates of recent hospital and drug utilization data, provider contracting changes, changes in benefit levels, changes in member cost sharing, changes in medical management processes, product mix, and weekday seasonality.

The completion factor method is used for the months of incurred claims prior to the most recent two months because the historical percentage of claims processed for those months is at a level sufficient to produce a consistently reliable result. Conversely, for the most recent two months of incurred claims, the volume of claims processed historically is not at a level sufficient to produce a reliable result, which therefore requires us to examine historical trend patterns as the primary method of evaluation. Changes in claim processes, including recoveries of overpayments, receipt cycle times, claim inventory levels, outsourcing, system conversions, and processing disruptions due to weather or other events affect views regarding the reasonable choice of completion factors. Claim payments to providers for services rendered are often net of overpayment recoveries for claims paid previously, as contractually allowed. Claim overpayment recoveries can result from many different factors, including retroactive enrollment activity, audits of provider billings, and/or payment errors. Changes in patterns of claim overpayment recoveries can be unpredictable and result in completion factor volatility, as they often impact older dates of service. The receipt cycle time measures the average length of time between when a medical claim was initially incurred and when the claim form was received. Increases in electronic claim submissions from providers decrease the receipt cycle time. If claims are submitted or processed on a faster (slower) pace than prior periods, the actual claim may be more (less) complete than originally estimated using our completion factors, which may result in reserves that are higher (lower) than required.

Medical cost trends potentially are more volatile than other segments of the economy. The drivers of medical cost trends include increases in the utilization of hospital facilities, physician services, new higher priced technologies and medical procedures, and new prescription drugs and therapies, as well as the inflationary effect on the cost per unit of each of these expense components. Other external factors such as government-mandated benefits or other regulatory changes, the tort liability system, increases in medical services capacity, direct to consumer advertising for prescription drugs and medical services, an aging population, lifestyle changes including diet and smoking, catastrophes, and epidemics also may impact medical cost trends. Internal factors such as system conversions, claims processing cycle times, changes in medical management practices and changes in provider contracts also may impact our ability to accurately predict estimates of historical completion factors or medical cost trends. All of these factors are considered in estimating IBNR and in estimating the per member per month claims trend for purposes of determining the reserve for the most recent two months. Additionally, we continually prepare and review follow-up studies to assess the reasonableness of the estimates generated by our process and methods over time. The results of these studies are also considered in determining the reserve for the most recent two months. Each of these factors requires significant judgment by management.

We reassess the profitability of our contracts for providing insurance coverage to our members when current operating results or forecasts indicate probable future losses. We establish a premium deficiency reserve in current operations to the extent that the sum of expected future costs, claim adjustment expenses, and maintenance costs exceeds related future premiums under contracts without consideration of investment income. For purposes of determining premium deficiencies, contracts are grouped in a manner consistent with our method of acquiring, servicing, and measuring the profitability of such contracts. Losses recognized as a premium deficiency result in a beneficial effect in subsequent periods as operating losses under these contracts are charged to the liability previously established. Because the majority of our member contracts renew annually, we would not record a material premium deficiency reserve, except when unanticipated adverse events or changes in circumstances indicate otherwise. In 2016, we increased our existing $176 million premium deficiency reserve for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year by $208 million. During 2016, the $384 million current period losses were applied to the premium deficiency liability for the 2016 coverage year.

We believe our benefits payable are adequate to cover future claims payments required. However, such estimates are based on knowledge of current events and anticipated future events. Therefore, the actual liability could differ materially from the amounts provided.

Future policy benefits payable

Future policy benefits payable include liabilities for long-duration insurance policies including life insurance, annuities, certain health and other supplemental, and prior to its sale in 2018, long-term care policies sold to individuals for which some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years.At policy issuance, these reserves are recognized on a net level premium method based on interest rates, mortality, morbidity, and maintenance expense assumptions. Interest rates are based on our expected net investment returns on the investment portfolio supporting the reserves for these blocks of business. Mortality, a measure of expected death, and morbidity, a measure of health status, assumptions are based on industry actuarial tables, modified based upon actual experience. Changes in estimates of these reserves are recognized as an adjustment to benefits expense in the period the changes occur. We perform loss recognition tests at least annually in the fourth quarter, and more frequently if adverse events or changes in circumstances indicate that the level of the liability, together with the present value of future gross premiums, may not be adequate to provide for future expected policy benefits and maintenance costs. During 2016, we recorded a loss for a premium deficiency as discussed further in Note 18.

We adjust future policy benefits payable for the additional liability that would have been recorded if investment securities backing the liability had been sold at their stated aggregate fair value and the proceeds reinvested at current yields. We include the impact of this adjustment, if any, net of applicable deferred taxes, with the change in unrealized investment gain (loss) in accumulated other comprehensive income in stockholders’ equity. Health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model under which policy reserves are not established because premiums received in the current year are intended to pay anticipated benefits in that year. In addition, as previously underwritten members transition to plans compliant with the Health Care Reform Law, it results in policy lapses and the release of reserves for future policy benefits.

Book Overdraft

Under our cash management system, checks issued but not yet presented to banks that would result in negative bank balances when presented are classified as a current liability in the consolidated balance sheets. Changes in book overdrafts from period to period are reported in the consolidated statement of cash flows as a financing activity.

Income Taxes

We recognize an asset or liability for the deferred tax consequences of temporary differences between the tax bases of assets or liabilities and their reported amounts in the consolidated financial statements. These temporary differences will result in taxable or deductible amounts in future years when the reported amounts of the assets or liabilities are recovered or settled. We also recognize the future tax benefits such as net operating and capital loss carryforwards as deferred tax assets. A valuation allowance is provided against these deferred tax assets if it is more likely than not that some portion or all of the deferred tax assets will not be realized. Future years’ tax expense may be increased or decreased by adjustments to the valuation allowance or to the estimated accrual for income taxes. Deferred tax assets and deferred tax liabilities are further adjusted for changes in the enacted tax rates.

We record tax benefits when it is more likely than not that the tax return position taken with respect to a particular transaction will be sustained. A liability, if recorded, is not considered resolved until the statute of limitations for the relevant taxing authority to examine and challenge the tax position has expired, or the tax position is ultimately settled through examination, negotiation, or litigation. We classify interest and penalties associated with uncertain tax positions in our provision for income taxes.

Stock-Based Compensation

We generally recognize stock-based compensation expense, as determined on the date of grant at fair value, on a straight-line basis over the period during which an employee is required to provide service in exchange for the award (the vesting period). In addition, for awards with both time and performance-based conditions, we generally recognize compensation expense on a straight line basis over the vesting period when it is probable that the performance condition will be achieved. We estimate expected forfeitures and recognize compensation expense only for those awards which are expected to vest. We estimate the grant-date fair value of stock options using the Black-Scholes option-pricing model.

Additional detail regarding our stock-based compensation plans is included in Note 13.

Earnings Per Common Share

We compute basic earnings per common share on the basis of the weighted-average number of unrestricted common shares outstanding. Diluted earnings per common share is computed on the basis of the weighted-average number of unrestricted common shares outstanding plus the dilutive effect of outstanding employee stock options and restricted shares, or units, using the treasury stock method.

Additional detail regarding earnings per common share is included in Note 14.

Fair Value

Assets and liabilities measured at fair value are categorized into a fair value hierarchy based on whether the inputs to valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own assumptions about the assumptions market participants would use. The fair value hierarchy includes three levels of inputs that may be used to measure fair value as described below.

Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt securities that are traded in an active exchange market.

Level 2 – Observable inputs other than Level 1 prices such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments as well as debt securities whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data.

Level 3 – Unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. Level 3 includes assets and liabilities whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques reflecting our own assumptions about the assumptions market participants would use as well as those requiring significant management judgment.

Fair value of actively traded debt securities are based on quoted market prices. Fair value of other debt securities are based on quoted market prices of identical or similar securities or based on observable inputs like interest rates generally using a market valuation approach, or, less frequently, an income valuation approach and are generally classified as Level 2. We obtain at least one price for each security from a third party pricing service. These prices are generally derived from recently reported trades for identical or similar securities, including adjustments through the reporting date based upon observable market information. When quoted prices are not available, the third party pricing service may use quoted market prices of comparable securities or discounted cash flow analysis, incorporating inputs that are currently observable in the markets for similar securities. Inputs that are often used in the valuation methodologies include benchmark yields, reported trades, credit spreads, broker quotes, default rates, and prepayment speeds. We are responsible for the determination of fair value and as such we perform analysis on the prices received from the third party pricing service to determine whether the prices are reasonable estimates of fair value. Our analysis includes a review of monthly price fluctuations as well as a quarterly comparison of the prices received from the pricing service to prices reported by our third party investment adviser. In addition, on a quarterly basis we examine the underlying inputs and assumptions for a sample of individual securities across asset classes, credit rating levels, and various durations.

Fair value of privately held debt securities are estimated using a variety of valuation methodologies, including both market and income approaches, where an observable quoted market does not exist and are generally classified as Level 3. For privately-held debt securities, such methodologies include reviewing the value ascribed to the most recent financing, comparing the security with securities of publicly-traded companies in similar lines of business, and reviewing the underlying financial performance including estimating discounted cash flows.

Recently Issued Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board, or FASB, issued new guidance that amends the accounting for revenue recognition. The amendments are intended to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices, and improve disclosure requirements. Insurance contracts are not included in the scope of this new guidance. Accordingly, our premiums revenue and investment income, collectively representing approximately 97% of our consolidated external revenues for the year ended December 31, 2018, are not included in the scope of the new guidance. We adopted the new standard effective January 1, 2018, using the modified retrospective approach. As the majority of our revenues are not subject to the new guidance and the remaining revenues’ accounting treatment did not materially differ from pre-existing accounting treatment, the adoption of the new standard did not have a material impact on our consolidated results of operations, financial condition, cash flows, or related disclosures.

Accounting Pronouncements Effective in Future Periods

In February 2016, the FASB issued new guidance related to accounting for leases which requires lessees to record assets and liabilities reflecting the leased assets and lease obligations, respectively, while following the dual model for recognition in statements of income requiring leases to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) while finance leases will result in a front-loaded expense pattern (similar to current capital leases). We adopted the new standard effective January 1, 2019, as allowed, using the modified retrospective approach. We elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allows us to carryforward the historical lease classification without restating comparative prior periods. We made a permitted accounting policy election to not apply the new guidance to leases with an initial term of 12 months or less. We will recognize those lease payments in the Consolidated Statements of Operations on a straight-line basis over the lease term. The adoption of the standard resulted in recognition of additional lease assets and lease liabilities of approximately $470 million as of January 1, 2019. We believe the standard will not materially affect our consolidated net earnings, cash flows and liquidity.

In June 2016, the FASB issued guidance introducing a new model for recognizing credit losses on financial instruments based on an estimate of current expected credit losses. The guidance is effective for us beginning January 1, 2020. The new current expected credit losses (CECL) model generally calls for the immediate recognition of all expected credit losses and applies to loans, accounts and trade receivables as well as other financial assets measured at amortized cost, loan commitments and off-balance sheet credit exposures, debt securities and other financial assets measured at fair value through other comprehensive income, and beneficial interests in securitized financial assets. The new guidance replaces the current incurred loss model for measuring expected credit losses, requires expected losses on available for sale debt securities to be recognized through an allowance for credit losses rather than as reductions in the amortized cost of the securities, and provides for additional disclosure requirements. Our investment portfolio consists of available for sale debt securities. We are currently evaluating the impact on our results of operations, financial condition, and cash flows.

In March 2017, the FASB issued new guidance that amends the accounting for premium amortization on purchased callable debt securities by shortening the amortization period. This amended guidance requires the premium to be amortized to the earliest call date instead of maturity date. The new guidance is effective for us beginning with annual and interim periods in 2019. This guidance will not have a material impact on our results of operations, financial condition or cash flows.

In February 2018, the FASB issued guidance which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the December 22, 2017 enactment of the Tax Cuts and Jobs Act.  The new guidance is effective for us beginning January 1, 2019, with early adoption permitted.  We early adopted this guidance in the first quarter of 2018 and it did not have a material impact on our results of operations, financial condition or cash flows.

In September 2018, the FASB issued new guidance related to accounting for long-duration contracts of insurers which revises key elements of the measurement models and disclosure requirements for long-duration contracts issued by insurers and reinsurers. The new guidance is effective for us beginning with annual and interim periods in 2021, with earlier adoption permitted, and requires retrospective application to previously issued annual and interim financial statements. We are currently evaluating the impact on our results of operations, financial position and cash flows.

There are no other recently issued accounting standards that apply to us or that are expected to have a material impact on our results of operations, financial condition, or cash flows.

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ACQUISITIONS AND DIVESTITURES

12 Months Ended

Dec. 31, 2018

Business Combinations [Abstract]

ACQUISITIONS AND DIVESTITURES

ACQUISITIONS AND DIVESTITURES

Acquisition of a 40% Minority Interest in Kindred’s Homecare Business

On July 2, 2018, we completed the acquisition of a 40%minority interest in the Kindred at Home Division, or Kindred at Home, of Kindred Healthcare, Inc., or Kindred, for cash consideration of approximately $850 million. TPG Capital, or TPG, and Welsh, Carson, Anderson & Stowe, or WCAS, collectively, the Sponsors, along with us jointly created a consortium to purchase all of the outstanding and issued securities of Kindred. Immediately following the closing of that transaction, Kindred at Home and the Specialty Hospital company were separated, with the result being that the Long Term Acute Care and Rehabilitation businesses (the Specialty Hospital Company) are owned by the Sponsors and Kindred at Home is owned by a joint venture owned by the Sponsors and us.

On July 11, 2018, we, along with the same Kindred at Home Sponsors, TPG and WCAS completed the acquisition of privately-held Curo Health Services, or Curo, one of the nation's leading hospice operators providing care to patients at 245 locations in 22 states. The transaction was structured as a merger of Curo with the hospice business of Kindred at Home, and we thereby purchased a 40%minority interest in Curo for cash consideration of approximately $250 million.

We account for our 40% investment in Kindred at Home using the equity method of accounting. This investment is reflected as "Equity method investment in Kindred at Home" in our consolidated balance sheets, with our share of income or loss reported as "Equity in net earnings of Kindred at Home" in our consolidated statements of income.

We entered into a shareholders agreement with the Sponsors that provides for certain rights and obligations of each party. The shareholders agreement with the Sponsors includes a put option under which they have the right to require us to purchase their interest in the joint venture starting at the end of year three and ending at the end of year four following the closing. Likewise, we have a call option under which we have the right to require the Sponsors to sell their interest in the joint venture to Humana beginning at the end of 2022 and ending at the end of 2023 following the closing. The put and call options, which are exercisable at a fixed EBITDA multiple and provide a minimum return on the Sponsor's investment if exercised, are measured at fair value each period using a Monte Carlo simulation. The simulation relies on assumptions around Kindred at Home's equity value, risk free interest rates, volatility, and the details specific to the put and call options. The final purchase price allocation resulted in approximately $1 billion being allocated to the investment and $236 million and $291 million allocated to the put and call options, respectively. The fair values of the put option and call option were $224 million and $246 million, respectively, at December 31, 2018. The put option is included within other long-term liabilities and the call option is included within other long-term assets. The change in fair value of the put and call options is reflected as "Other expense, net" in our consolidated statements of income.

Sale of Closed Block of Commercial Long-Term Care Insurance Business

On August 9, 2018, we completed the sale of our wholly-owned subsidiary, KMG America Corporation, or KMG, to Continental General Insurance Company, or CGIC, a Texas-based insurance company wholly owned by HC2 Holdings, Inc., a diversified holding company. KMG's subsidiary, Kanawha Insurance Company, or KIC, includes our closed block of non-strategic commercial long-term care policies. Upon closing, we funded the transaction with approximately $190 million of parent company cash contributed into KMG, subject to customary adjustments, in addition to the transfer of approximately $160 million of statutory capital with the sale. In connection with the sale of KMG, we recognized a pretax loss, including transaction costs, of  $786 million and a corresponding $452 million tax benefit. 

Prior to the sale of KMG, we entered into reinsurance contracts to transfer the risk associated with certain voluntary benefit and financial protection products previously issued primarily by KIC to a third party. We transferred approximately $245 millionof cash to the third party and recorded a commensurate reinsurance recoverable as a result of these transactions. The reinsurance recoverable was included as part of the net assets disposed. There was no material impact to operating results from these reinsurance transactions.

KMG revenues and net income for the 2018 period prior to the date of sale was $182 million and $47 million, respectively. KMG revenues and net loss were $261 million and $117 million, respectively, for the year ended December 31, 2017 and $249 million and $336 million, respectively, for the year ended December 31, 2016.

The assets and liabilities of KMG that were disposed of on August 9, 2018 were as follows:

	August 9, 2018
Assets	(in millions)
Cash and cash equivalents	$	805
Receivables, net	3
Investment securities	1,576
Other assets	1,085
Total assets disposed	$	3,469
Liabilities
Benefits payable	$	58
Trade accounts payable and accrued expenses	70
Future policy benefits payable	2,573
Total liabilities disposed	$	2,701

Other Acquisitions and Divestitures

On March 1, 2018, we acquired the remaining equity interest in MCCI Holdings, LLC, or MCCI, a privately held management service organization and healthcare provider headquartered in Miami, Florida, that primarily coordinates medical care for Medicare Advantage beneficiaries in Florida and Texas. The purchase price consisted primarily of $169 million cash, as well as our existing investment in MCCI and a note receivable and a revolving note with an aggregate balance of $383 million. This resulted in a preliminary purchase price allocation to goodwill of $483 million, definite-lived intangible assets of $80 million, and net tangible assets of $24 million. The goodwill was assigned to the Retail and Healthcare Services segments. The definite-lived intangible assets, which primarily consist of customer contracts, have an estimated weighted average useful life of 8 years.

On April 10, 2018, we acquired Family Physicians Group, or FPG, for cash consideration of approximately $185 million, net of cash received. FPG serves Medicare Advantage and Managed Medicaid HMO patients in Greater Orlando, Florida with a footprint that includes clinics located in Lake, Orange, Osceola and Seminole counties. This resulted in a preliminary purchase price allocation to goodwill of $133 million, definite-lived intangible assets of $38 million and net tangible assets of $14 million. The goodwill was assigned to the Retail and Healthcare Services segments. The other intangible assets, which primarily consist of customer contracts, have an estimated weighted average useful life of 5 years.

The purchase price allocations for MCCI and FPG are preliminary, subject to receipt and validation of certain tax related analyses.

During 2017 and 2016, we acquired certain other health and wellness related businesses which, individually or in the aggregate, have not had a material impact on our results of operations, financial condition, or cash flows. The results of operations and financial condition of these businesses have been included in our consolidated statements of income and consolidated balance sheets from the respective acquisition dates.

Acquisition-related costs recognized in each of 2018, 2017 and 2016 were not material to our results of operations. Goodwill and definite-lived intangible assets acquired are partially amortizable as deductible expenses for tax purposes. The pro forma financial information assuming the acquisitions had occurred as of the beginning of the calendar year prior to the year of acquisition, as well as the revenues and earnings generated during the year of acquisition, were not material for disclosure purposes.

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EQUITY METHOD INVESTMENT

12 Months Ended

Dec. 31, 2018

Equity Method Investments and Joint Ventures [Abstract]

EQUITY METHOD INVESTMENT

EQUITY METHOD INVESTMENT

The summarized balance sheet at December 31, 2018 and income statement for the period beginning July 2, 2018 through December 31, 2018 of Kindred at Home in which we hold a 40% equity interest was as follows:

Balance sheet	December 31, 2018
	(in millions)
Current assets	$	536
Non-current assets	4,955
Current liabilities	351
Non-current liabilities	2,708
Shareholders' equity	2,432
Statement of income
	July 2, 2018 through December 31, 2018
	(in millions)
Revenues	$	1,587
Expenses	1,451
Net income	27

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INVESTMENT SECURITIES

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

INVESTMENT SECURITIES

INVESTMENT SECURITIES

Investment securities classified as current and long-term were as follows at December 31, 2018 and 2017, respectively:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
December 31, 2018
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	419	$	1	$	(3	)	$	417
Mortgage-backed securities	2,595		3		(54		)	2,544
Tax-exempt municipal securities	2,805		3		(37		)	2,771
Mortgage-backed securities:
Residential	55		—		—			55
Commercial	537		—		(14		)	523
Asset-backed securities	991		1		(7		)	985
Corporate debt securities	3,239		1		(98		)	3,142
Total debt securities	$	10,641	$	9	$	(213	)	$	10,437
December 31, 2017
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	532	$	1	$	(2	)	$	531
Mortgage-backed securities	1,625		4		(19		)	1,610
Tax-exempt municipal securities	3,884		33		(28		)	3,889
Mortgage-backed securities:
Residential	26		—		—			26
Commercial	455		3		(2		)	456
Asset-backed securities	407		1		—			408
Corporate debt securities	5,175		244		(37		)	5,382
Total debt securities	$	12,104	$	286	$	(88	)	$	12,302

Gross unrealized losses and fair values aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows at December 31, 2018 and 2017, respectively:

	Less than 12 months					12 months or more					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in millions)
December 31, 2018
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	179	$	(1	)	$	153	$	(2	)	$	332	$	(3	)
Mortgage-backed securities	956		(16		)	1,019		(38		)	1,975		(54		)
Tax-exempt municipal securities	809		(9		)	1,648		(28		)	2,457		(37		)
Mortgage-backed securities:
Residential	—		—			15		—			15		—
Commercial	372		(8		)	133		(6		)	505		(14		)
Asset-backed securities	824		(7		)	40		—			864		(7		)
Corporate debt securities	1,434		(35		)	1,439		(63		)	2,873		(98		)
Total debt securities	$	4,574	$	(76	)	$	4,447	$	(137	)	$	9,021	$	(213	)
December 31, 2017
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	273	$	(1	)	$	130	$	(1	)	$	403	$	(2	)
Mortgage-backed securities	581		(2		)	672		(17		)	1,253		(19		)
Tax-exempt municipal securities	1,590		(16		)	661		(12		)	2,251		(28		)
Mortgage-backed securities:
Residential	20		—			3		—			23		—
Commercial	131		(1		)	28		(1		)	159		(2		)
Asset-backed securities	107		—			10		—			117		—
Corporate debt securities	1,297		(10		)	804		(27		)	2,101		(37		)
Total debt securities	$	3,999	$	(30	)	$	2,308	$	(58	)	$	6,307	$	(88	)

Approximately 97% of our debt securities were investment-grade quality, with a weighted average credit rating of AA by S&P at December 31, 2018. Most of the debt securities that were below investment-grade were rated BB, the higher end of the below investment-grade rating scale. Tax-exempt municipal securities were diversified among general obligation bonds of states and local municipalities in the United States as well as special revenue bonds issued by municipalities to finance specific public works projects such as utilities, water and sewer, transportation, or education. Our general obligation bonds are diversified across the United States with no individual state exceeding 9%. Our investment policy limits investments in a single issuer and requires diversification among various asset types.

Our unrealized loss from all securities was generated from approximately 1,210 positions out of a total of approximately 1,500 positions at December 31, 2018. All issuers of securities we own that were trading at an unrealized loss at December 31, 2018 remain current on all contractual payments. After taking into account these and other factors previously described, we believe these unrealized losses primarily were caused by an increase in market interest rates in the current markets since the time the securities were purchased. At December 31, 2018, we did not intend to sell the securities with an unrealized loss position in accumulated other comprehensive income, and it is not likely that we will be required to sell these securities before recovery of their amortized cost basis. As a result, we believe that the securities with an unrealized loss were not other-than-temporarily impaired at December 31, 2018.

The detail of realized gains (losses) related to investment securities and included within investment income was as follows for the years ended December 31, 2018, 2017, and 2016:

	2018			2017			2016
	(in millions)
Gross realized gains	$	106		$	35		$	120
Gross realized losses	(16		)	(21		)	(24		)
Net realized capital gains	$	90		$	14		$	96

There were no material other-than-temporary impairments in 2018, 2017, or 2016.

The contractual maturities of debt securities available for sale at December 31, 2018, regardless of their balance sheet classification, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
	(in millions)
Due within one year	$	943	$	941
Due after one year through five years	2,929		2,873
Due after five years through ten years	1,873		1,810
Due after ten years	718		706
Mortgage and asset-backed securities	4,178		4,107
Total debt securities	$	10,641	$	10,437

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FAIR VALUE

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

FAIR VALUE

FAIR VALUE

Financial Assets

The following table summarizes our fair value measurements at December 31, 2018 and 2017, respectively, for financial assets measured at fair value on a recurring basis:

			Fair Value Measurements Using
	Fair Value		Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
	(in millions)
December 31, 2018
Cash equivalents	$	2,024	$	2,024	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	417		—		417		—
Mortgage-backed securities	2,544		—		2,544		—
Tax-exempt municipal securities	2,771		—		2,771		—
Mortgage-backed securities:
Residential	55		—		55		—
Commercial	523		—		523		—
Asset-backed securities	985		—		985		—
Corporate debt securities	3,142		—		3,142		—
Total debt securities	10,437		—		10,437		—
Total invested assets	$	12,461	$	2,024	$	10,437	$	—
December 31, 2017
Cash equivalents	$	4,564	$	4,564	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	531		—		531		—
Mortgage-backed securities	1,610		—		1,610		—
Tax-exempt municipal securities	3,889		—		3,889		—
Mortgage-backed securities:
Residential	26		—		26		—
Commercial	456		—		456		—
Asset-backed securities	408		—		408		—
Corporate debt securities	5,382		—		5,381		1
Total debt securities	12,302		—		12,301		1
Total invested assets	$	16,866	$	4,564	$	12,301	$	1

The table above does not include the fair value of the put and call options associated with our equity investment in Kindred at Home. See Note 3 for further information.

Financial Liabilities

Our debt is recorded at carrying value in our consolidated balance sheets. The carrying value of our senior notes debt outstanding, net of unamortized debt issuance costs, was $4,774 million at December 31, 2018 and $4,770 million at December 31, 2017. The fair value of our senior note debt was $4,885 million at December 31, 2018 and $5,191 million at December 31, 2017. The fair value of our senior note debt is determined based on Level 2 inputs, including quoted market prices for the same or similar debt, or if no quoted market prices are available, on the current prices estimated to be available to us for debt with similar terms and remaining maturities. Due to the short-term nature, carrying value approximates fair value for our term note and commercial paper borrowings. The term loan outstanding and commercial paper borrowings were $1,295 million at December 31, 2018, compared to $150 million at December 31, 2017.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

As disclosed in Note 3, we acquired MCCI, FPG, and other health and wellness related businesses during 2018, 2017, and 2016. The values of net tangible assets acquired and the resulting goodwill and other intangible assets were recorded at fair value using Level 3 inputs. The majority of the tangible assets acquired and liabilities assumed were recorded at their carrying values as of the respective dates of acquisition, as their carrying values approximated their fair values due to their short-term nature. The fair values of goodwill and other intangible assets acquired in these acquisitions were internally estimated primarily based on the income approach. The income approach estimates fair value based on the present value of the cash flows that the assets are expected to generate in the future. We developed internal estimates for the expected future cash flows and discount rates used in the present value calculations. Other than assets acquired and liabilities assumed in these acquisitions, there were no material assets or liabilities measured at fair value on a nonrecurring basis during 2018, 2017, or 2016.

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MEDICARE PART D

12 Months Ended

Dec. 31, 2018

Insurance [Abstract]

MEDICARE PART D

MEDICARE PART D

As discussed in Note 2, we cover prescription drug benefits in accordance with Medicare Part D under multiple contracts with CMS. The accompanying consolidated balance sheets include the following amounts associated with Medicare Part D as of December 31, 2018 and 2017. CMS subsidies/discounts in the table below include the reinsurance and low-income cost subsidies funded by CMS for which we assume no risk as well as brand name prescription drug discounts for Part D plan participants in the coverage gap funded by CMS and pharmaceutical manufacturers.

	2018						2017
	Risk Corridor Settlement			CMS Subsidies/ Discounts			Risk Corridor Settlement			CMS Subsidies/ Discounts
	(in millions)
Other current assets	$	15		$	172		$	4		$	101
Trade accounts payable and accrued expenses	(103		)	(503		)	(255		)	(1,085		)
Net current liability	(88		)	(331		)	(251		)	$	(984	)
Other long-term assets	7			—			—			—
Other long-term liabilities	(89		)	—			(28		)	—
Net long-term liability	(82		)	—			(28		)	—
Total net liability	$	(170	)	$	(331	)	$	(279	)	$	(984	)

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PROPERTY AND EQUIPMENT, NET

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT, NET

PROPERTY AND EQUIPMENT, NET

Property and equipment was comprised of the following at December 31, 2018 and 2017.

	2018			2017
	(in millions)
Land	$	20		$	20
Buildings and leasehold improvements	766			713
Equipment	890			824
Computer software	2,372			2,003
	4,048			3,560
Accumulated depreciation	(2,313		)	(1,976		)
Property and equipment, net	$	1,735		$	1,584

Depreciation expense was $444 million in 2018, $410 million in 2017, and $388 million in 2016, including amortization expense for capitalized internally developed and purchased software of $298 million in 2018, $287 million in 2017, and $255 million in 2016.

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GOODWILL AND OTHER INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

GOODWILL AND OTHER INTANGIBLE ASSETS

Changes in the carrying amount of goodwill for our reportable segments for the years ended December 31, 2018 and 2017 were as follows:

	Retail		Group and Specialty		Healthcare Services		Total
	(in millions)
Balance at January 1, 2017	$	1,059	$	261	$	1,952	$	3,272
Acquisitions	—		—		9		9
Balance at December 31, 2017	1,059		261		1,961		3,281
Acquisitions	476		—		140		616
Balance at December 31, 2018	$	1,535	$	261	$	2,101	$	3,897

The following table presents details of our other intangible assets included in other long-term assets in the accompanying consolidated balance sheets at December 31, 2018 and 2017.

	Weighted Average Life	2018						2017
		Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
		(in millions)
Other intangible assets:
Customer contracts/relationships	8.7 years	$	646	$	434	$	212	$	566	$	401	$	165
Trade names and technology	6.4 years	84		83		1		104		84		20
Provider contracts	11.8 years	68		37		31		68		30		38
Noncompetes and other	7.3 years	29		28		1		32		29		3
Total other intangible assets	8.7 years	$	827	$	582	$	245	$	770	$	544	$	226

Amortization expense for other intangible assets was approximately $90 million in 2018, $75 million in 2017, and $77 million in 2016. Amortization expense for 2018 included $12 million associated with the write-off of a trade name value reflecting the re-branding of certain provider assets.

The following table presents our estimate of amortization expense for each of the five next succeeding fiscal years:

	(in millions)
For the years ending December 31,
2019	$	70
2020	67
2021	34
2022	31
2023	18

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BENEFITS PAYABLE

12 Months Ended

Dec. 31, 2018

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

BENEFITS PAYABLE

BENEFITS PAYABLE

On a consolidated basis, activity in benefits payable, excluding military services, was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	4,668		$	4,563		$	4,976
Less: Premium deficiency reserve	—			—			(176		)
Less: Reinsurance recoverables	(70		)	(76		)	(85		)
Balances at January 1, net	4,598			4,487			4,715
Incurred related to:
Current year	46,385			44,001			45,318
Prior years	(503		)	(483		)	(582		)
Total incurred	45,882			43,518			44,736
Paid related to:
Current year	(41,736		)	(39,496		)	(40,852		)
Prior years	(3,977		)	(3,911		)	(4,112		)
Total paid	(45,713		)	(43,407		)	(44,964		)
Reinsurance recoverable	95			70			76
Balances at December 31	$	4,862		$	4,668		$	4,563

Amounts incurred related to prior years vary from previously estimated liabilities as the claims ultimately are settled. Negative amounts reported for incurred related to prior years result from claims being ultimately settled for amounts less than originally estimated (favorable development).

As previously discussed, our reserving practice is to consistently recognize the actuarial best estimate of our ultimate liability for claims. Actuarial standards require the use of assumptions based on moderately adverse experience, which generally results in favorable reserve development, or reserves that are considered redundant. We experienced favorable medical claims reserve development related to prior fiscal years of $503 million in 2018, $483 million in 2017, and $582 million in 2016. The table below details our favorable medical claims reserve development related to prior fiscal years by segment for 2018, 2017, and 2016.

	Favorable Medical Claims Reserve Development
	2018			2017			2016
Retail Segment	$	(398	)	$	(386	)	$	(429	)
Group and Specialty Segment	(46		)	(40		)	(46		)
Individual Commercial Segment	(57		)	(56		)	(106		)
Other Businesses	(2		)	(1		)	(1		)
Total	$	(503	)	$	(483	)	$	(582	)

The favorable medical claims reserve development for 2018, 2017, and 2016 primarily reflects the consistent application of trend and completion factors estimated using an assumption of moderately adverse conditions. Favorable prior period development primarily resulted from our Medicare Advantage and individual commercial medical businesses.

Benefits expense excluded from the previous table was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018		2017			2016
	(in millions)
Premium deficiency reserve for short-duration policies	$	—	$	—		$	(176	)
Military services	—		—			8
Future policy benefits	—		(22		)	439
Total	$	—	$	(22	)	$	271

Military services benefits expense for 2016 in the table above reflect expenses associated with our contracts with the Veterans Administration.

The higher benefits expense associated with future policy benefits payable during 2016 primarily relates to reserve strengthening for our closed block of long-term care insurance policies, which were sold in 2018, as more fully described in Note 18.

Incurred and Paid Claims Development

The following discussion provides information about incurred and paid claims development for our segments as of December 31, 2018, net of reinsurance, as well as cumulative claim frequency and the total of IBNR included within the net incurred claims amounts. The information about incurred and paid claims development for the years ended December 31,2016 and 2017 is presented as supplementary information.

Claims frequency is measured as medical fee-for-service claims for each service encounter with a unique provider identification number. Our claims frequency measure includes claims covered by deductibles as well as claims under capitated arrangements. Claim counts may vary based on product mix and the percentage of delegated capitation arrangements.

Retail Segment

Activity in benefits payable for our Retail segment was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	3,963		$	3,506		$	3,600
Less: Reinsurance recoverables	(70		)	(76		)	(85		)
Balances at January 1, net	3,893			3,430			3,515
Incurred related to:
Current year	41,323			38,604			37,212
Prior years	(398		)	(386		)	(429		)
Total incurred	40,925			38,218			36,783
Paid related to:
Current year	(37,189		)	(34,781		)	(33,784		)
Prior years	(3,386		)	(2,974		)	(3,084		)
Total paid	(40,575		)	(37,755		)	(36,868		)
Reinsurance recoverable	95			70			76
Balances at December 31	$	4,338		$	3,963		$	3,506

At December 31, 2018, benefits payable for our Retail segment included IBNR of approximately $2.9 billion, primarily associated with claims incurred in 2018. The cumulative number of reported claims as of December 31, 2018 was approximately 104.3 million for claims incurred in 2018, 102.1 million for claims incurred in 2017, and 96.2 million for claims incurred in 2016.

The following tables provide information about incurred and paid claims development for the Retail segment as of December 31, 2018, net of reinsurance.

	Incurred Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	37,212	$	36,891	$	36,811
2017			38,604		38,341
2018					41,323
Total					$	116,475

	Cumulative Paid Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	33,784	$	36,841	$	36,811
2017			34,781		38,232
2018					37,189
Total					$	112,232
All outstanding benefit liabilities before 2015, net of reinsurance					N/A
Benefits payable, net of reinsurance					$	4,243

Group and Specialty Segment

Activity in benefits payable for our Group and Specialty segment, excluding military services, was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	568		$	579		$	616
Less: Reinsurance recoverables	—			—			—
Balances at January 1, net	568			579			616
Incurred related to:
Current year	5,466			5,403			5,271
Prior years	(46		)	(40		)	(46		)
Total incurred	5,420			5,363			5,225
Paid related to:
Current year	(4,957		)	(4,843		)	(4,700		)
Prior years	(514		)	(531		)	(562		)
Total paid	(5,471		)	(5,374		)	(5,262		)
Balances at December 31	$	517		$	568		$	579

At December 31, 2018, benefits payable for our Group and Specialty segment included IBNR of approximately $448 million, primarily associated with claims incurred in 2018. The cumulative number of reported claims as of December 31, 2018 was approximately 10.4 million for claims incurred in 2018, 11.1 million for claims incurred in 2017, and 12.9 million for claims incurred in 2016.

The following tables provide information about incurred and paid claims development for the Group and Specialty segment as of December 31, 2018, net of reinsurance.

	Incurred Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	5,271	$	5,234	$	5,235
2017			5,403		5,358
2018					5,466
Total					$	16,059

	Cumulative Paid Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	4,700	$	5,226	$	5,234
2017			4,843		5,351
2018					4,957
Total					$	15,542
All outstanding benefit liabilities before 2015, net of reinsurance					N/A
Benefits payable, net of reinsurance					$	517

Individual Commercial Segment

Activity in benefits payable for ourIndividual Commercial segment, was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	101		$	454		$	741
Less: Premium deficiency reserve	—			—			(176		)
Balances at January 1, net	101			454			565
Incurred related to:
Current year	—			669			3,677
Prior years	(56		)	(56		)	(106		)
Total incurred	(56		)	613			3,571
Paid related to:
Current year	—			(583		)	(3,233		)
Prior years	(38		)	(383		)	(449		)
Total paid	(38		)	(966		)	(3,682		)
Balances at December 31	$	7		$	101		$	454

At December 31, 2018, benefits payable for our Individual Commercial segment included IBNR of approximately $1 million, associated with claims prior to 2018. The cumulative number of reported claims as of December 31, 2017 was approximately 2.2 million for claims incurred in 2017 and 9.5 million for claims incurred in 2016.

The following tables provide information about incurred and paid claims development for the Individual Commercial segment as of December 31, 2018, net of reinsurance.

	Incurred Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	3,677	$	3,621	$	3,609
2017			669		627
2018					—
Total					$	4,236

	Cumulative Paid Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	3,233	$	3,606	$	3,609
2017			583		620
2018					—
Total					$	4,229
All outstanding benefit liabilities before 2015, net of reinsurance					N/A
Benefits payable, net of reinsurance					$	7

Reconciliation to Consolidated

The reconciliation of the net incurred and paid claims development tables to benefits payable in the consolidated statement of financial position is as follows:    

	December 31, 2018
Net outstanding liabilities
Retail	$	4,243
Group and Specialty	517
Individual Commercial	7
Benefits payable, net of reinsurance	4,767
Reinsurance recoverable on unpaid claims
Retail	95
Total benefits payable, gross	$	4,862

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INCOME TAXES

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The provision for income taxes consisted of the following for the years ended December 31, 2018, 2017 and 2016:

	2018		2017		2016
	(in millions)
Current provision:
Federal	$	139	$	1,324	$	921
States and Puerto Rico	58		116		88
Total current provision	197		1,440		1,009
Deferred expense (benefit)	194		132		(71		)
Provision for income taxes	$	391	$	1,572	$	938

The provision for income taxes was different from the amount computed using the federal statutory rate for the years ended December 31, 2018, 2017 and 2016 due to the following:

	2018			2017			2016
	(in millions)
Income tax provision at federal statutory rate	$	436		$	1,407		$	543
States, net of federal benefit, and Puerto Rico	42			80			41
Tax exempt investment income	(11		)	(22		)	(20		)
Health insurance industry fee	243			—			336
Nondeductible executive compensation	17			36			30
Tax reform	(39		)	133			—
KMG sale	(272		)	—			—
Other, net	(25		)	(62		)	8
Provision for income taxes	$	391		$	1,572		$	938

The tax reform law enacted on December 22, 2017 (the "Tax Reform Law") reduced the statutory federal corporate income tax rate to 21 percent from 35 percent, beginning in 2018, and required a mandatory deemed repatriation of undistributed foreign earnings. The rate reduction required a remeasurement of our net deferred tax asset. These items resulted in an estimated increase in our 2017 tax provision of approximately $133 million, including approximately $10 million for the deemed repatriation tax imposed on the undistributed earnings of our Puerto Rico operations. Revisions to our prior estimate for the income tax effects of the Tax Reform Law decreased our 2018 tax provision by approximately $39 million.

The incremental tax benefit on the sale of KMG of $272 million resulted from a tax loss higher than the loss recorded in the statement of income for the year ended December 31, 2018 due to a higher tax basis in KMG than book basis. In addition, the amount reflects our ability to carryback the capital loss to tax years 2015, 2016 and 2017 at the historical tax rate of 35 percent instead of the current tax rate of 21 percent.

Deferred income tax balances reflect the impact of temporary differences between the tax bases of assets or liabilities and their reported amounts in our consolidated financial statements, and are stated at enacted tax rates expected to be in effect when the reported amounts are actually recovered or settled.

Principal components of our net deferred tax balances at December 31, 2018 and 2017 were as follows:

	Assets (Liabilities)
	2018			2017
	(in millions)
Compensation and other accrued expense	$	89		$	138
Benefits payable	79			113
Investment securities	44			—
Net operating loss carryforward	38			53
Capital loss carryforward	15			—
Deferred acquisition costs	17			48
Unearned revenues	9			12
Other	8			1
Future policy benefits payable	—			231
Total deferred income tax assets	299			596
Valuation allowance	(54		)	(49		)
Total deferred income tax assets, net of valuation allowance	245			547
Depreciable property and intangible assets	(273		)	(237		)
Prepaid expenses	(52		)	(44		)
Future policy benefits payable	(5		)	—
Investment securities	—			(49		)
Total deferred income tax liabilities	(330		)	(330		)
Total net deferred income tax assets/(liabilities)	$	(85	)	$	217

All deferred tax liabilities and assets are classified as noncurrent in our consolidated balance sheets as other long-term liabilities at December 31, 2018 and as other long-term assets at December 31, 2017.

At December 31, 2018, we had approximately $104 million of net operating losses and $64 million of capital losses to carry forward. These loss carryforwards, if not used to offset future taxable income or capital gain, will expire from 2019 through 2037. Due to limitations and uncertainty regarding our ability to use some of the loss carryforwards and certain other deferred tax assets, a valuation allowance of $54 million was established. For the remainder of the net operating loss carryforwards and other cumulative temporary differences, based on our historical record of producing taxable income and profitability, we have concluded that future operating income will be sufficient to give rise to tax expense to recover these deferred tax assets.

We file income tax returns in the United States and Puerto Rico. The U.S. Internal Revenue Service, or IRS, has completed its examinations of our consolidated income tax returns for 2016 and prior years. Our 2017 tax return is in the post-filing review period under the Compliance Assurance Process, or CAP. Our 2018 tax return is under advance review by the IRS under CAP. With a few exceptions, which are immaterial in the aggregate, we no longer are subject to state, local and foreign tax examinations for years before 2015. We are not aware of any material adjustments that may be proposed as a result of any ongoing or future examinations. We do not have material uncertain tax positions reflected in our consolidated balance sheets.

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DEBT

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

DEBT

DEBT

The carrying value of debt outstanding was as follows at December 31, 2018 and 2017:

	2018		2017
	(in millions)
Short-term debt:
Commercial paper	$	645	150
Term note	650		—
Senior note:
$400 million, 2.625% due October 1, 2019	399		—
Total short-term debt	$	1,694	$	150
Long-term debt:
Senior notes:
$400 million, 2.625% due October 1, 2019	$	—	$	399
$400 million, 2.50% due December 15, 2020	398		397
$400 million, 2.90% due December 15, 2022	396		396
$600 million, 3.15% due December 1, 2022	596		595
$600 million, 3.85% due October 1, 2024	597		595
$600 million, 3.95% due March 15, 2027	594		594
$250 million, 8.15% due June 15, 2038	263		263
$400 million, 4.625% due December 1, 2042	396		396
$750 million, 4.95% due October 1, 2044	739		739
$400 million, 4.80% due March 15, 2047	396		396
Total long-term debt	$	4,375	$	4,770

Maturities of the short-term and long-term debt for the years ending December 31, are as follows:

For the years ending December 31,	(in millions)
2019	$	1,697
2020	400
2021	—
2022	1,000
2023	—
Thereafter	3,000

Senior Notes

Our senior notes, which are unsecured, may be redeemed at our option at any time at 100% of the principal amount plus accrued interest and a specified make-whole amount. The 8.15% senior notes are subject to an interest rate adjustment if the debt ratings assigned to the notes are downgraded (or subsequently upgraded). In addition, our senior notes contain a change of control provision that may require us to purchase the notes under certain circumstances. We recognized a loss on extinguishment of debt of approximately$17 million in 2017 for the early redemption of senior notes, which is included in interest expense in the consolidated statements of income.

Credit Agreement

Our 5-year, $2.0 billion unsecured revolving credit agreement expires May 2022. Under the credit agreement, at our option, we can borrow on either a competitive advance basis or a revolving credit basis. The revolving credit portion bears interest at either LIBOR plus a spread or the base rate plus a spread. The LIBOR spread, currently 110.0 basis points, varies depending on our credit ratings ranging from 91.0 to 150.0 basis points. We also pay an annual facility fee regardless of utilization. This facility fee, currently 15.0 basis points, may fluctuate between 9.0 and 25.0 basis points, depending upon our credit ratings. The competitive advance portion of any borrowings will bear interest at market rates prevailing at the time of borrowing on either a fixed rate or a floating rate based on LIBOR, at our option.

The terms of the credit agreement include standard provisions related to conditions of borrowing which could limit our ability to borrow additional funds. In addition, the credit agreement contains customary restrictive covenants and a financial covenant regarding maximum debt to capitalization of 50% as well as customary events of default. We are in compliance with this financial covenant, with an actual debt to capitalization of 37% as measured in accordance with the credit agreement as of December 31, 2018. Upon our agreement with one or more financial institutions, we may expand the aggregate commitments under the credit agreement to a maximum of $2.5 billion, through a $500 million incremental loan facility.

At December 31, 2018, we had no borrowings and no letters of credit outstanding under the credit agreement. Accordingly, as of December 31, 2018, we had $2 billionof remaining borrowing capacity (which excludes the uncommitted $500 million incremental loan facility under the credit agreement), none of which would be restricted by our financial covenant compliance requirement. We have other customary, arms-length relationships, including financial advisory and banking, with some parties to the credit agreement.

Commercial Paper

    Under our commercial paper program we may issue short-term, unsecured commercial paper notes privately placed on a discount basis through certain broker dealers at any time not to exceed $2 billion. Amounts available under the program may be borrowed, repaid and re-borrowed from time to time. The net proceeds of issuances have been and are expected to be used for general corporate purposes. The maximum principal amount outstanding at any one time during the year endedDecember 31, 2018 was $923 million, with $645 million outstanding at December 31, 2018 compared to $150 million outstanding at December 31, 2017. The outstanding commercial paper at December 31, 2018 had a weighted average annual interest rate of 3.06%.

Term Note

In November 2018, we entered into a $1.0 billion term note agreement with a bank at a variable rate of interest due within one year. We may elect to incur interest at either the bank's base rate or LIBOR plus 115 basis points. The base rate is defined as the higher of the daily federal funds rate plus 50 basis points; or the bank's prime rate; or LIBOR plus 100 basis points. The interest rate in effect at December 31, 2018 was 3.67%. The note is prepayable without penalty. Proceeds were primarily used to fund the November 2018 accelerated stock repurchase agreement. We repaid $350 million prior to December 31, 2018. The term note shares the customary terms and provisions as well as financial covenants of our Credit Agreement, as discussed above.

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EMPLOYEE BENEFIT PLANS

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS

Employee Savings Plan

We have defined contribution retirement savings plans covering eligible employees which include matching contributions based on the amount of our employees’ contributions to the plans. The cost of these plans amounted to approximately $197 million in 2018, $217 million in 2017, and $196 million in 2016. The Company’s cash match is invested pursuant to the participant’s contribution direction. Based on the closing price of our common stock of $286.48 on December 31, 2018, approximately 12% of the retirement and savings plan’s assets were invested in our common stock, or approximately 1.8 million shares, representing approximately 1.3% of the shares outstanding as of December 31, 2018. At December 31, 2018, approximately 2.0 million shares of our common stock were reserved for issuance under our defined contribution retirement savings plans.

Stock-Based Compensation

We have plans under which options to purchase our common stock and restricted stock units have been granted to executive officers, directors and key employees. Awards generally require both a change in control and termination of employment within 2 years of the date of the change in control to accelerate the vesting, including those granted to retirement-eligible participants.

The terms and vesting schedules for stock-based awards vary by type of grant. Generally, the awards vest upon time-based conditions. We have also granted awards to certain employees that vest upon a combination of time and performance-based conditions. The stock awards of retirement-eligible participants are generally earned ratably over the service period for each tranche. Accordingly, upon retirement the earned portion of the current tranche will continue to vest on the originally scheduled vest date and any remaining unearned portion of the award will be forfeited. Our equity award program includes a retirement provision that generally treats employees with a combination of age and years of services with the Company totaling 65 or greater, with a minimum required age of 55 and a minimum requirement of 5 years of service, as retirement-eligible. Upon exercise, stock-based compensation awards are settled with authorized but unissued company stock or treasury stock.

The compensation expense that has been charged against income for these plans was as follows for the years ended December 31,2018, 2017, and 2016:

	2018			2017			2016
	(in millions)
Stock-based compensation expense by type:
Restricted stock	$	124		$	145		$	106
Stock options	13			12			9
Total stock-based compensation expense	137			157			115
Tax benefit recognized	(21		)	(32		)	(20		)
Stock-based compensation expense, net of tax	$	116		$	125		$	95

Stock-based compensation expense for certain restricted stock in 2017 included a $29 million modification expense for certain awards.

The tax benefit recognized in our consolidated financial statements is based on the amount of compensation expense recorded for book purposes, subject to limitations on the deductibility of annual compensation in excess of $500,000 per employee as mandated by the Health Care Reform Law. The actual tax benefit realized in our tax return is based on the intrinsic value, or the excess of the market value over the exercise or purchase price, of stock options exercised and restricted stock vested during the period, subject to limitations on the deductibility of annual compensation in excess of $500,000 per employee as mandated by the Health Care Reform Law. The actual tax benefit realized for the deductions taken on our tax returns from option exercises and restricted stock vesting totaled $49 million in 2018, $68 million in 2017, and $53 million in 2016. There was no capitalized stock-based compensation expense during these years.

At December 31, 2018, there were 13.1 million shares reserved for stock award plans. These reserved shares included giving effect to, under the 2011 Plan, 4.7 million shares of common stock available for future grants assuming all stock options were granted or 2.0 million shares available for future grants assuming all restricted stock were granted. Shares may be issued from authorized but unissued company stock or treasury stock.

Restricted Stock

Restricted stock is granted with a fair value equal to the market price of our common stock on the date of grant and generally vests in equal annual tranches over a three year period from the date of grant. Certain of our restricted stock grants also include performance-based conditions generally associated with return on invested capital and strategic membership growth. Restricted stock units have forfeitable dividend equivalent rights equal to the dividend paid on common stock. The weighted-average grant date fair value of our restricted stock was $276.62 in 2018, $222.35 in 2017, and $168.12 in 2016. Activity for our restricted stock was as follows for the year ended December 31, 2018:

	Shares		Weighted- Average Grant-Date Fair Value
	(shares in thousands)
Nonvested restricted stock at December 31, 2017	1,653		$	171.68
Granted	576		276.62
Vested	(1,045	)	185.82
Forfeited	(220	)	180.83
Nonvested restricted stock at December 31, 2018	964		$	213.99

Approximately 12% of the nonvested restricted stock at December 31, 2018 included performance-based conditions.

The fair value of shares vested was $298 million during 2018, $306 million during 2017, and $253 million during 2016. Total compensation expense not yet recognized related to nonvested restricted stock was $156 million at December 31, 2018. We expect to recognize this compensation expense over a weighted-average period of approximately 1.8 years. There are no other contractual terms covering restricted stock once vested.

Stock Options

Stock options are granted with an exercise price equal to the fair market value of the underlying common stock on the date of grant. Our stock plans, as approved by the Board of Directors and stockholders, define fair market value as the average of the highest and lowest stock prices reported on the composite tape by the New York Stock Exchange on a given date. Exercise provisions vary, but most options vest in whole or in part 1 to 3 years after grant and expire 7 years after grant.

The weighted-average fair value of each option granted during 2018, 2017, and 2016 is provided below. The fair value was estimated on the date of grant using the Black-Scholes pricing model with the weighted-average assumptions indicated below:

	2018			2017			2016
Weighted-average fair value at grant date	$	63.67		$	49.81		$	37.12
Expected option life (years)	4.1 years			4.1 years			4.2 years
Expected volatility	26.1		%	27.1		%	27.6		%
Risk-free interest rate at grant date	2.5		%	2.0		%	1.1		%
Dividend yield	0.7		%	0.7		%	0.7		%

When valuing employee stock options, we stratify the employee population into three homogeneous groups that historically have exhibited similar exercise behaviors. These groups are executive officers, directors, and all other employees. We value the stock options based on the unique assumptions for each of these employee groups.

We calculate the expected term for our employee stock options based on historical employee exercise behavior and base the risk-free interest rate on a traded zero-coupon U.S. Treasury bond with a term substantially equal to the option’s expected term.

The volatility used to value employee stock options is based on historical volatility. We calculate historical volatility using a simple-average calculation methodology based on daily price intervals as measured over the expected term of the option.

Activity for our option plans was as follows for the year ended December 31, 2018:

	Shares  Under Option		Weighted-Average Exercise Price
	(shares in thousands)
Options outstanding at December 31, 2017	863		$	181.44
Granted	143		276.01
Exercised	(320	)	157.44
Forfeited	(9	)	150.59
Options outstanding at December 31, 2018	677		$	213.17
Options exercisable at December 31, 2018	178		$	180.76

As of December 31, 2018, outstanding stock options, substantially all of which are expected to vest, had an aggregate intrinsic value of $48 million, and a weighted-average remaining contractual term of 5 years. As of December 31, 2018, exercisable stock options had an aggregate intrinsic value of $19 million, and a weighted-average remaining contractual term of 4.1 years. The total intrinsic value of stock options exercised during 2018 was $43 million, compared with $44 million during 2017 and $18 million during 2016. Cash received from stock option exercises totaled $50 million in 2018, $63 million in 2017, and $14 million in 2016.

Total compensation expense not yet recognized related to nonvested options was $14 million at December 31, 2018. We expect to recognize this compensation expense over a weighted-average period of approximately 1.7 years.

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EARNINGS PER COMMON SHARE COMPUTATION

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

EARNINGS PER COMMON SHARE COMPUTATION

EARNINGS PER COMMON SHARE COMPUTATION

Detail supporting the computation of basic and diluted earnings per common share was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018		2017		2016
	(dollars in millions, except per common share results, number of shares/options in thousands)
Net income available for common stockholders	$	1,683	$	2,448	$	614
Weighted-average outstanding shares of common stock used to compute basic earnings per common share	137,486		144,493		149,375
Dilutive effect of:
Employee stock options	194		172		219
Restricted stock	723		920		1,323
Shares used to compute diluted earnings per common share	138,403		145,585		150,917
Basic earnings per common share	$	12.24	$	16.94	$	4.11
Diluted earnings per common share	$	12.16	$	16.81	$	4.07
Number of antidilutive stock options and restricted stock awards excluded from computation	223		539		748

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STOCKHOLDERS' EQUITY

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

STOCKHOLDERS' EQUITY

STOCKHOLDERS’ EQUITY

Dividends

The following table provides details of dividend payments, excluding dividend equivalent rights, in 2016, 2017, and 2018 under our Board approved quarterly cash dividend policy:

Payment Date	Amount per Share	Total Amount
		(in millions)
2016	$1.16	$172
2017	$1.49	$216
2018	$1.90	$262

On November 2, 2018, the Board declared a cash dividend of $0.50 per share that was paid on January 25, 2019 to stockholders of record on December 31, 2018, for an aggregate amount of $68 million. Declaration and payment of future quarterly dividends is at the discretion of our Board and may be adjusted as business needs or market conditions change.

In February 2019, the Board declared a cash dividend of$0.55 per share payable on April 26, 2019 to stockholders of record on March 29, 2019.

Stock Repurchases

Our Board of Directors may authorize the purchase of our common shares. Under our share repurchase authorization, shares may have been purchased from time to time at prevailing prices in the open market, by block purchases, through plans designed to comply with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, or in privately-negotiated transactions (including pursuant to accelerated share repurchase agreements with investment banks), subject to certain regulatory restrictions on volume, pricing, and timing.

On February 14, 2017, our Board of Directors authorized the repurchase of up to $2.25 billion of our common shares expiring on December 31, 2017, exclusive of shares repurchased in connection with employee stock plans.

On February 16, 2017, we entered into an accelerated share repurchase agreement, the February 2017 ASR, with Goldman, Sachs & Co. LLC, or Goldman Sachs, to repurchase $1.5 billion of our common stock as part of the $2.25 billion share repurchase authorized on February 14, 2017. On February 22, 2017, we made a payment of $1.5 billion to Goldman Sachs from available cash on hand and received an initial delivery of 5.83 million shares of our common stock from Goldman Sachs based on the then current market price of Humana common stock. The payment to Goldman Sachs was recorded as a reduction to stockholders’ equity, consisting of a $1.2 billion increase in treasury stock, which reflected the value of the initial 5.83 million shares received upon initial settlement, and a $300 million decrease in capital in excess of par value, which reflected the value of stock held back by Goldman Sachs pending final settlement of the February 2017 ASR. Upon settlement of the February 2017 ASR on August 28, 2017, we received an additional 0.84 million shares as determined by the average daily volume weighted-average share price of our common stock during the term of the agreement of $224.81, less a discount and subject to adjustments pursuant to the terms and conditions of the February 2017 ASR, bringing the total shares received under this program to 6.67 million. In addition, upon settlement we reclassified the $300 million value of stock initially held back by Goldman Sachs from capital in excess of par value to treasury stock. Subsequent to settlement of the February 2017 ASR, we repurchased an additional 3.04 million shares in the open market, utilizing the remaining $750 million of the $2.25 billion authorization prior to expiration.

On December 14, 2017, our Board of Directors authorized the repurchase of up to $3.0 billion of our common shares expiring on December 31, 2020, exclusive of shares repurchased in connection with employee stock plans.

On December 21, 2017, we entered into an accelerated stock repurchase agreement, the December 2017 ASR, with Bank of America, N.A., or BofA, to repurchase $1.0 billion of our common stock as part of the $3.0 billion share repurchase program authorized on December 14, 2017. On December 22, 2017, we made a payment of $1.0 billion to BofA from available cash on hand and received an initial delivery of 3.28 million shares of our common stock from BofA based on the then current market price of Humana common stock. The payment to BofA was recorded as a reduction to stockholders’ equity, consisting of an $800 million increase in treasury stock, which reflected the value of the initial 3.28 million shares received upon initial settlement, and a $200 million decrease in capital in excess of par value, which reflected the value of stock held back by BofA pending final settlement of the December 2017 ASR. Upon settlement of the ASR on March 26, 2018, we received an additional 0.46 million shares as determined by the average daily volume weighted-average share price of our common stock during the term of the ASR Agreement of $267.55, bringing the total shares received under this program to 3.74 million. In addition, upon settlement we reclassified the $200 million value of stock initially held back by BofA from capital in excess of par value to treasury stock.

On November 28, 2018, we entered into an accelerated stock repurchase agreement, the November 2018 ASR, with Goldman Sachs to repurchase $750 millionof our common stock as part of the$3.0 billionshare repurchase program authorized by the Board of Directors on December 14, 2017. On November 29, 2018, we made a payment of $750 million to Goldman Sachs from available cash on hand and received an initial delivery of 1.94 million shares of our common stock from Goldman Sachs. The payment to Goldman Sachs was recorded as a reduction to stockholders’ equity, consisting of a $600 million increase in treasury stock, which reflects the value of the initial 1.94 million shares received upon initial settlement, and a $150 million decrease in capital in excess of par value, which reflected the value of stock held back by Goldman Sachs pending final settlement of the November 2018 ASR. The final number of shares that we may receive, or be required to remit, under the agreement will be determined based on the daily volume-weighted average share price of our common stock over the term of the agreement, less a discount and subject to adjustments pursuant to the terms and conditions of the agreement. Final settlement under the November 2018 ASR is expected to occur by the end of the first quarter of 2019. The agreement contains provisions customary for agreements of this type, including provisions for adjustments to the transaction terms upon certain specified events, the circumstances generally under which final settlement may be accelerated or extended or the agreement may be terminated early by Goldman Sachs or Humana, and various acknowledgments and representations made by the parties to each other. At final settlement, under certain circumstances, we may be entitled to receive additional shares of our common stock from Goldman Sachs or we may be required to make a payment. If we are obligated to make payment, we may elect to satisfy such obligation in cash or shares of our common stock.

Our remaining repurchase authorization was approximately $1,176 million as of February 21, 2019, excluding the $150 million pending final settlement of our November 28, 2018 ASR.

Excluding shares acquired in connection with employee stock plans, share repurchases were as follows during the years ended December 31, 2018, 2017 and 2016.

		2018			2017			2016
Authorization Date	Purchase Not to Exceed	Shares	Cost		Shares	Cost		Shares	Cost
	(in millions)
February 2017	2,250	—	—		9.71	2,250		—	—
December 2017	3,000	3.07	1,024		3.28	800		—	—
Total repurchases		3.07	$	1,024	12.99	$	3,050	—	$	—

In connection with employee stock plans, we acquired 0.4 million common shares for $116 million in 2018, 0.5 million common shares for $115 million in 2017, and 0.6 million common shares for $104 million in 2016.

Regulatory Requirements

Certain of our subsidiaries operate in states that regulate the payment of dividends, loans, or other cash transfers to Humana Inc., our parent company, and require minimum levels of equity as well as limit investments to approved securities. The amount of dividends that may be paid to Humana Inc. by these subsidiaries, without prior approval by state regulatory authorities, or ordinary dividends, is limited based on the entity’s level of statutory income and statutory capital and surplus. If the dividend, together with other dividends paid within the preceding twelve months, exceeds a specified statutory limit or is paid from sources other than earned surplus, it is generally considered an extraordinary dividend requiring prior regulatory approval. In most states, prior notification is provided before paying a dividend even if approval is not required.

Although minimum required levels of equity are largely based on premium volume, product mix, and the quality of assets held, minimum requirements vary significantly at the state level. Our state regulated insurances subsidiaries had aggregate statutory capital and surplus of approximately$7.6 billion and $8.0 billion as of December 31, 2018 and 2017, respectively, which exceeded aggregate minimum regulatory requirements of$5.2 billion and $4.8 billion, respectively. The amount of ordinary dividends that may be paid to our parent company in2019is approximately$1 billionin the aggregate. The amount, timing and mix of ordinary and extraordinary dividend payments will vary due to state regulatory requirements, the level of excess statutory capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix. Actual dividends that were paid to our parent company were approximately$2.3 billion in 2018, $1.4 billion in 2017, and $0.8 billion in 2016.

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COMMITMENTS, GUARANTEES AND CONTINGENCIES

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS, GUARANTEES AND CONTINGENCIES

COMMITMENTS, GUARANTEES AND CONTINGENCIES

Leases

We lease facilities, computer hardware, and other furniture and equipment under long-term operating leases that are noncancelable and expire on various dates through 2046. We sublease facilities or partial facilities to third party tenants for space not used in our operations. Rent with scheduled escalation terms are accounted for on a straight-line basis over the lease term. Rent expense and sublease rental income, which are recorded net as an operating cost, for all operating leases were as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Rent expense	$	167		$	204		$	179
Sublease rental income	(32		)	(33		)	(26		)
Net rent expense	$	135		$	171		$	153

Future annual minimum payments due subsequent to December 31, 2018 under all of our noncancelable operating leases with initial terms in excess of one year are as follows:

	Minimum Lease Payments		Sublease Rental Receipts			Net  Lease Commitments
	(in millions)
For the years ending December 31,:
2019	$	147	$	(13	)	$	134
2020	113		(12		)	101
2021	96		(10		)	86
2022	79		(9		)	70
2023	34		(9		)	25
Thereafter	50		(23		)	27
Total	$	519	$	(76	)	$	443

Purchase Obligations

We have agreements to purchase services, primarily information technology related services, or to make improvements to real estate, in each case that are enforceable and legally binding on us and that specify all significant terms, including: fixed or minimum levels of service to be purchased; fixed, minimum or variable price provisions; and the appropriate timing of the transaction. We have purchase obligation commitments of $240 million in 2019, $201 million in 2020, $136 million in 2021, $98 million in 2022, and $61 million in 2023. Purchase obligations exclude agreements that are cancelable without penalty.

Off-Balance Sheet Arrangements

As part of our ongoing business, we do not participate or knowingly seek to participate in transactions that generate relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, or SPEs, which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. As of December 31, 2018, we were not involved in any SPE transactions.

Guarantees and Indemnifications

Through indemnity agreements approved by the state regulatory authorities, certain of our regulated subsidiaries generally are guaranteed by Humana Inc., our parent company, in the event of insolvency for (1) member coverage for which premium payment has been made prior to insolvency; (2) benefits for members then hospitalized until discharged; and (3) payment to providers for services rendered prior to insolvency. Our parent also has guaranteed the obligations of our military services subsidiaries and funding to maintain required statutory capital levels of certain regulated subsidiaries.

In the ordinary course of business, we enter into contractual arrangements under which we may agree to indemnify a third party to such arrangement from any losses incurred relating to the services they perform on behalf of us, or for losses arising from certain events as defined within the particular contract, which may include, for example, litigation or claims relating to past performance. Such indemnification obligations may not be subject to maximum loss clauses. Historically, payments made related to these indemnifications have been immaterial.

Government Contracts

Our Medicare products, which accounted for approximately 80% of our total premiums and services revenue for the year ended December 31, 2018, primarily consisted of products covered under the Medicare Advantage and Medicare Part D Prescription Drug Plan contracts with the federal government. These contracts are renewed generally for a calendar year term unless CMS notifies us of its decision not to renew by May 1 of the calendar year in which the contract would end, or we notify CMS of our decision not to renew by the first Monday in June of the calendar year in which the contract would end. All material contracts between Humana and CMS relating to our Medicare products have been renewed for 2019, and all of our product offerings filed with CMS for 2019 have been approved.

CMS uses a risk-adjustment model which adjusts premiums paid to Medicare Advantage, or MA, plans according to health status of covered members. The risk-adjustment model, which CMS implemented pursuant to the Balanced Budget Act of 1997 (BBA) and the Benefits Improvement and Protection Act of 2000 (BIPA), generally pays more where a plan's membership has higher expected costs. Under this model, rates paid to MA plans are based on actuarially determined bids, which include a process whereby our prospective payments are based on our estimated cost of providing standard Medicare-covered benefits to an enrollee with a "national average risk profile." That baseline payment amount is adjusted to reflect the health status of our enrolled membership. Under the risk-adjustment methodology, all MA plans must collect and submit the necessary diagnosis code information from hospital inpatient, hospital outpatient, and physician providers to CMS within prescribed deadlines. The CMS risk-adjustment model uses the diagnosis data to calculate the risk-adjusted premium payment to MA plans, which CMS adjusts for coding pattern differences between the health plans and the government fee-for-service program. We generally rely on providers, including certain providers in our network who are our employees, to code their claim submissions with appropriate diagnoses, which we send to CMS as the basis for our payment received from CMS under the actuarial risk-adjustment model. We also rely on these providers to document appropriately all medical data, including the diagnosis data submitted with claims. In addition, we conduct medical record reviews as part of our data and payment accuracy compliance efforts, to more accurately reflect diagnosis conditions under the risk adjustment model. These compliance efforts include the internal contract level audits described in more detail below, as well as ordinary course reviews of our internal business processes.

CMS is phasing-in the process of calculating risk scores using diagnoses data from the Risk Adjustment Processing System, or RAPS, to diagnoses data from the Encounter Data System, or EDS. The RAPS process requires MA plans to apply a filter logic based on CMS guidelines and only submit diagnoses that satisfy those guidelines. For submissions through EDS, CMS requires MA plans to submit all the encounter data and CMS will apply the risk adjustment filtering logic to determine the risk scores. For 2018, 15% of the risk score was calculated from claims data submitted through EDS. In 2019 and 2020 CMS will increase that percentage to 25% and 50%, respectively.The phase-in from RAPS to EDS could result in different risk scores from each dataset as a result of plan processing issues, CMS processing issues, or filtering logic differences between RAPS and EDS, and could have a material adverse effect on our results of operations, financial position, or cash flows.

CMS and the Office of the Inspector General of Health and Human Services, or HHS-OIG, are continuing to perform audits of various companies’ selected MA contracts related to this risk adjustment diagnosis data. We refer to these audits as Risk-Adjustment Data Validation Audits, or RADV audits. RADV audits review medical records in an attempt to validate provider medical record documentation and coding practices which influence the calculation of premium payments to MA plans.

In 2012, CMS released a “Notice of Final Payment Error Calculation Methodology for Part C Medicare Advantage Risk Adjustment Data Validation (RADV) Contract-Level Audits.” The payment error calculation methodology provided that, in calculating the economic impact of audit results for an MA contract, if any, the results of the RADV audit sample would be extrapolated to the entire MA contract after a comparison of the audit results to a similar audit of Medicare FFS (we refer to the process of accounting for errors in FFS claims as the "FFS Adjuster"). This comparison of RADV audit results to the FFS error rate is necessary to determine the economic impact, if any, of RADV audit results because the government used the Medicare FFS program data set, including any attendant errors that are present in that data set, to estimate the costs of various health status conditions and to set the resulting adjustments to MA plans’ payment rates in order to establish actuarial equivalence in payment rates as required under the Medicare statute. CMS already makes other adjustments to payment rates based on a comparison of coding pattern differences between MA plans and Medicare FFS data (such as for frequency of coding for certain diagnoses in MA plan data versus the Medicare FFS program dataset).

The final RADV extrapolation methodology, including the first application of extrapolated audit results to determine audit settlements, is expected to be applied to CMS RADV contract level audits conducted for contract year 2011 and subsequent years. CMS is currently conducting RADV contract level audits for certain of our Medicare Advantage plans.

Estimated audit settlements are recorded as a reduction of premiums revenue in our consolidated statements of income, based upon available information. We perform internal contract level audits based on the RADV audit methodology prescribed by CMS. Included in these internal contract level audits is an audit of our Private Fee-For Service business which we used to represent a proxy of the FFS Adjuster which has not yet been finalized. We based our accrual of estimated audit settlements for each contract year on the results of these internal contract level audits and update our estimates as each audit is completed. Estimates derived from these results were not material to our results of operations, financial position, or cash flows. We report the results of these internal contract level audits to CMS, including identified overpayments, if any.

On October 26, 2018, CMS issued a proposed rule and accompanying materials (which we refer to as the “Proposed Rule”) related to, among other things, the RADV audit methodology described above. If implemented, the Proposed Rule would use extrapolation in RADV audits applicable to payment year 2011 contract-level audits and all subsequent audits, without the application of a FFS Adjuster to audit findings. We are studying the Proposed Rule and CMS’ underlying analysis contained therein. We believe, however, that the Proposed Rule fails to address adequately the statutory requirement of actuarial equivalence, and we expect to provide substantive comments to CMS on the Proposed Rule as part of the notice-and-comment rulemaking process. We are also evaluating the potential impact of the Proposed Rule, and any related regulatory, industry or company reactions, all or any of which could have a material adverse effect on our results of operations, financial position, or cash flows.

In addition, as part of our internal compliance efforts, we routinely perform ordinary course reviews of our internal business processes related to, among other things, our risk coding and data submissions in connection with the risk- adjustment model. These reviews may also result in the identification of errors and the submission of corrections to CMS, that may, either individually or in the aggregate, be material. As such, the result of these reviews may have a material adverse effect on our results of operations, financial position, or cash flows.

We believe that CMS' statements and policies regarding the requirement to report and return identified overpayments received by MA plans are inconsistent with CMS' 2012 RADV audit methodology, and the Medicare statute's requirements. These statements and policies, such as certain statements contained in the preamble to CMS’ final rule release regarding Medicare Advantage and Part D prescription drug benefit program regulations for Contract Year 2015 (which we refer to as the "Overpayment Rule"), and the Proposed Rule, appear to equate each Medicare Advantage risk adjustment data error with an “overpayment” without addressing the principles underlying the FFS Adjuster referenced above. On September 7, 2018, the Federal District Court for the District of Columbia vacated CMS's Overpayment Rule, concluding that it violated the Medicare statute, including the requirement for actuarial equivalence, and that the Overpayment Rule was also arbitrary and capricious in departing from CMS's RADV methodology without adequate explanation (among other reasons). CMS has filed a motion for reconsideration related to certain aspects of the Federal District Court's opinion and has simultaneously filed a notice to appeal the decision to the Circuit Court of Appeals.

We will continue to work with CMS to ensure that MA plans are paid accurately and that payment model principles are in accordance with the requirements of the Social Security Act, which, if not implemented correctly could have a material adverse effect on our results of operations, financial position, or cash flows.

At December 31, 2018, our military services business, which accounted for approximately 1% of our total premiums and services revenue for the year ended December 31, 2018, primarily consisted of the TRICARE T2017 East Region contract replacing the 5-year T3 South Region contract that expired on December 31, 2017. The T2017 East Region contract is a consolidation of the former T3 North and South Regions, comprising thirty-two states and approximately 6 million TRICARE beneficiaries, under which delivery of health care services commenced on January 1, 2018. The T2017 East Region contract is a 5-year contract set to expire on December 31, 2022 and is subject to renewals on January 1 of each year during its term at the government's option.

Our state-based Medicaid business accounted for approximately 4% of our total premiums and services revenue for the year ended December 31, 2018. In addition to our state-based Temporary Assistance for Needy Families, or TANF, Medicaid contracts in Florida and Kentucky, we have contracts in Florida for Long Term Support Services (LTSS), and in Illinois for stand-alone dual eligible demonstration programs serving individuals dually eligible for both the federal Medicare program and the applicable state-based Medicaid program.

The loss of any of the contracts above or significant changes in these programs as a result of legislative or regulatory action, including reductions in premium payments to us, regulatory restrictions on profitability, including reviews by regulatory bodies that may compare our Medicare Advantage profitability to our non-Medicare Advantage business profitability, or compare the profitability of various products within our Medicare Advantage business, and require that they remain within certain ranges of each other, or increases in member benefits without corresponding increases in premium payments to us, may have a material adverse effect on our results of operations, financial position, and cash flows.

Legal Proceedings and Certain Regulatory Matters

As previously disclosed, the Civil Division of the United States Department of Justice provided us with an information request in December 2014, concerning our Medicare Part C risk adjustment practices. The request relates to our oversight and submission of risk adjustment data generated by providers in our Medicare Advantage network, as well as to our business and compliance practices related to risk adjustment data generated by our providers and by us, including medical record reviews conducted as part of our data and payment accuracy compliance efforts, the use of health and well-being assessments, and our fraud detection efforts. We believe that this request for information is in connection with a wider review of Medicare Risk Adjustment generally that includes a number of Medicare Advantage plans, providers and vendors. We continue to cooperate with and voluntarily respond to the information requests from the Department of Justice. These matters are expected to result in additional qui tam litigation.

As previously disclosed, on January 19, 2016, an individual filed a qui tam suit captioned United States of America ex rel. Steven Scott v. Humana, Inc., in United States District Court, Central District of California, Western Division. The complaint alleges certain civil violations by us in connection with the actuarial equivalence of the plan benefits under Humana’s Basic PDP plan, a prescription drug plan offered by us under Medicare Part D. The action seeks damages and penalties on behalf of the United States under the False Claims Act. The court ordered the qui tam action unsealed on September 13, 2017, so that the relator could proceed, following notice from the U.S. Government that it was not intervening at that time. On January 29, 2018, the suit was transferred to the United States District Court, Western District of Kentucky, Louisville Division. We take seriously our obligations to comply with applicable CMS requirements and actuarial standards of practice, and continue to vigorously defend against these allegations since the transfer to the Western District of Kentucky. We have engaged in active discovery with the relator who has pursed the matter on behalf of the United States for the past year, and expect that discovery process to conclude in the near future and for the Court to consider our motion for summary judgment.

On November 2, 2017, we filed suit against the United States of America in the United States Court of Federal Claims, on behalf of our health plans seeking recovery from the federal government of approximately$611 million in payments under the risk corridor premium stabilization program established under Health Care Reform , for years 2014, 2015 and 2016. Our case has been stayed by the Court, pending resolution of similar cases filed by other insurers. We have not recognized revenue, nor have we recorded a receivable, for any amount due from the federal government for unpaid risk corridor payments as of December 31, 2018. We have fully recognized all liabilities due to the federal government that we have incurred under the risk corridor program, and have paid all amounts due to the federal government as required. There is no assurance that we will prevail in the lawsuit.

Other Lawsuits and Regulatory Matters

Our current and past business practices are subject to review or other investigations by various state insurance and health care regulatory authorities and other state and federal regulatory authorities. These authorities regularly scrutinize the business practices of health insurance, health care delivery and benefits companies. These reviews focus on numerous facets of our business, including claims payment practices, statutory capital requirements, provider contracting, risk adjustment, competitive practices, commission payments, privacy issues, utilization management practices, pharmacy benefits, access to care, and sales practices, among others. Some of these reviews have historically resulted in fines imposed on us and some have required changes to some of our practices. We continue to be subject to these reviews, which could result in additional fines or other sanctions being imposed on us or additional changes in some of our practices.

We also are involved in various other lawsuits that arise, for the most part, in the ordinary course of our business

operations, certain of which may be styled as class-action lawsuits. Among other matters, this litigation may include employment matters, claims of medical malpractice, bad faith, nonacceptance or termination of providers, anticompetitive practices, improper rate setting, provider contract rate and payment disputes, including disputes over reimbursement rates required by statute, general contractual matters, intellectual property matters, and challenges to subrogation practices. Under state guaranty assessment laws, including those related to state cooperative failures in the industry, we may be assessed (up to prescribed limits) for certain obligations to the policyholders and claimants of insolvent insurance companies that write the same line or lines of business as we do.

As a government contractor, we may also be subject to qui tam litigation brought by individuals who seek to sue on behalf of the government, alleging that the government contractor submitted false claims to the government including, among other allegations, those resulting from coding and review practices under the Medicare risk adjustment model. Qui tam litigation is filed under seal to allow the government an opportunity to investigate and to decide if it wishes to intervene and assume control of the litigation. If the government does not intervene, the individual may continue to prosecute the action on his or her own, on behalf of the government. We also are subject to other allegations of non-performance of contractual obligations to providers, members, and others, including failure to properly pay claims, improper policy terminations, challenges to our implementation of the Medicare Part D prescription drug program and other litigation.

A limited number of the claims asserted against us are subject to insurance coverage. Personal injury claims, claims for extra contractual damages, care delivery malpractice, and claims arising from medical benefit denials are covered by insurance from our wholly owned captive insurance subsidiary and excess carriers, except to the extent that claimants seek punitive damages, which may not be covered by insurance in certain states in which insurance coverage for punitive damages is not permitted. In addition, insurance coverage for all or certain forms of liability has become increasingly costly and may become unavailable or prohibitively expensive in the future.

We record accruals for the contingencies discussed in the sections above to the extent that we conclude it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. No estimate of the possible loss or range of loss in excess of amounts accrued, if any, can be made at this time regarding the matters specifically described above because of the inherently unpredictable nature of legal proceedings, which also may be exacerbated by various factors, including: (i) the damages sought in the proceedings are unsubstantiated or indeterminate; (ii) discovery is not complete; (iii) the proceeding is in its early stages; (iv) the matters present legal uncertainties; (v) there are significant facts in dispute; (vi) there are a large number of parties (including where it is uncertain how liability, if any, will be shared among multiple defendants); or (vii) there is a wide range of potential outcomes.

The outcome of any current or future litigation or governmental or internal investigations, including the matters described above, cannot be accurately predicted, nor can we predict any resulting judgments, penalties, fines or other sanctions that may be imposed at the discretion of federal or state regulatory authorities or as a result of actions by third parties. Nevertheless, it is reasonably possible that any such outcome of litigation, judgments, penalties, fines or other sanctions could be substantial, and the outcome of these matters may have a material adverse effect on our results of operations, financial position, and cash flows, and may also affect our reputation.

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SEGMENT INFORMATION

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

We manage our business with four reportable segments: Retail, Group and Specialty, Healthcare Services, and Individual Commercial. In addition, the Other Businesses category includes businesses that are not individually reportable because they do not meet the quantitative thresholds required by generally accepted accounting principles. These segments are based on a combination of the type of health plan customer and adjacent businesses centered on well-being solutions for our health plans and other customers, as described below. These segment groupings are consistent with information used by our Chief Executive Officer to assess performance and allocate resources.

The Retail segment consists of Medicare benefits, marketed to individuals or directly via group Medicare accounts. In addition, the Retail segment also includes our contract with CMS to administer the Limited Income Newly Eligible Transition, or LI-NET, prescription drug plan program and contracts with various states to provide Medicaid, dual eligible, and Long-Term Support Services benefits, which we refer to collectively as our state-based contracts. The Group and Specialty segment consists of employer group commercial fully-insured medical and specialty health insurance benefits marketed to individuals and employer groups, including dental, vision, and other supplemental health benefits, as well as administrative services only, or ASO products. In addition, our Group and Specialty segment includes military services business, primarily our TRICARE T2017 East Region contract. The Healthcare Services segment includes our services offered to our health plan members as well as to third parties, including pharmacy solutions, provider services, and clinical care service, such as home health and other services and capabilities to promote wellness and advance population health, including our investment in Kindred at Home. The Individual Commercial segment consisted of our individual commercial fully-insured medical health insurance business, which we exited beginning January 1, 2018. We report under the category of Other Businesses those businesses that do not align with the reportable segments described above, primarily our closed-block long-term care insurance policies, which were sold in 2018.

Our Healthcare Services intersegment revenues primarily relate to managing prescription drug coverage for members of our other segments through Humana Pharmacy Solutions®, or HPS, and includes the operations of Humana Pharmacy, Inc., our mail order pharmacy business. These revenues consist of the prescription price (ingredient cost plus dispensing fee), including the portion to be settled with the member (co-share) or with the government (subsidies), plus any associated administrative fees. Services revenues related to the distribution of prescriptions by third party retail pharmacies in our networks are recognized when the claim is processed and product revenues from dispensing prescriptions from our mail order pharmacies are recorded when the prescription or product is shipped. Our pharmacy operations, which are responsible for designing pharmacy benefits, including defining member co-share responsibilities, determining formulary listings, contracting with retail pharmacies, confirming member eligibility, reviewing drug utilization, and processing claims, act as a principal in the arrangement on behalf of members in our other segments. As principal, our Healthcare Services segment reports revenues on a gross basis, including co-share amounts from members collected by third party retail pharmacies at the point of service.

In addition, our Healthcare Services intersegment revenues include revenues earned by certain owned providers derived from risk-based and non-risk-based managed care agreements with our health plans. Under risk based agreements, the provider receives a monthly capitated fee that varies depending on the demographics and health status of the member, for each member assigned to these owned providers by our health plans. The owned provider assumes the economic risk of funding the assigned members’ healthcare services. Under non risk-based agreements, our health plans retain the economic risk of funding the assigned members' healthcare services. Our Healthcare Services segment reports provider services revenues associated with risk-based agreements on a gross basis, whereby capitation fee revenue is recognized in the period in which the assigned members are entitled to receive healthcare services. Provider services revenues associated with non-risk-based agreements are presented net of associated healthcare costs.

We present our consolidated results of operations from the perspective of the health plans. As a result, the cost of providing benefits to our members, whether provided via a third party provider or internally through a stand-alone subsidiary, is classified as benefits expense and excludes the portion of the cost for which the health plans do not bear responsibility, including member co-share amounts and government subsidies of $13.4 billion in 2018, $13.5 billion in 2017, and $13.4 billion in 2016. In addition, depreciation and amortization expense associated with certain businesses in our Healthcare Services segment delivering benefits to our members, primarily associated with our provider services and pharmacy operations, are included with benefits expense. The amount of this expense was $129 million in 2018, $107 million in 2017, and $111 million in 2016.

Other than those described previously, the accounting policies of each segment are the same and are described in Note 2. Transactions between reportable segments primarily consist of sales of services rendered by our Healthcare Services segment, primarily pharmacy, provider, and clinical care services, to our Retail and Group and Specialty segment customers. Intersegment sales and expenses are recorded at fair value and eliminated in consolidation. Members served by our segments often use the same provider networks, enabling us in some instances to obtain more favorable contract terms with providers. Our segments also share indirect costs and assets. As a result, the profitability of each segment is interdependent. We allocate most operating expenses to our segments. Assets and certain corporate income and expenses are not allocated to the segments, including the portion of investment income not supporting segment operations, interest expense on corporate debt, and certain other corporate expenses. These items are managed at a corporate level. These corporate amounts are reported separately from our reportable segments and are included with intersegment eliminations in the tables presenting segment results below.

	Retail		Group and Specialty		Healthcare Services		Individual Commercial			Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
2018
External revenues
Premiums:
Individual Medicare Advantage	$	35,656	$	—	$	—	$	—		$	—	$	—		$	35,656
Group Medicare Advantage	6,103		—		—		—			—		—			6,103
Medicare stand-alone PDP	3,584		—		—		—			—		—			3,584
Total Medicare	45,343		—		—		—			—		—			45,343
Fully-insured	510		5,444		—		8			—		—			5,962
Specialty	—		1,359		—		—			—		—			1,359
Medicaid and other	2,255		—		—		—			22		—			2,277
Total premiums	48,108		6,803		—		8			22		—			54,941
Services revenue:
Provider	—		—		404		—			—		—			404
ASO and other	11		835		—		—			4		—			850
Pharmacy	—		—		203		—			—		—			203
Total services revenue	11		835		607		—			4		—			1,457
Total external revenues	48,119		7,638		607		8			26		—			56,398
Intersegment revenues
Services	—		18		16,840		—			—		(16,858		)	—
Products	—		—		6,330		—			—		(6,330		)	—
Total intersegment revenues	—		18		23,170		—			—		(23,188		)	—
Investment income	136		23		34		—			110		211			514
Total revenues	48,255		7,679		23,811		8			136		(22,977		)	56,912
Operating expenses:
Benefits	40,925		5,420		—		(70		)	77		(470		)	45,882
Operating costs	5,327		1,810		22,905		4			6		(22,527		)	7,525
Depreciation and amortization	270		88		163		—			—		(116		)	405
Total operating expenses	46,522		7,318		23,068		(66		)	83		(23,113		)	53,812
Income from operations	1,733		361		743		74			53		136			3,100
Loss on sale of business	—		—		—		—			—		786			786
Interest expense	—		—		—		—			—		218			218
Other expense, net	—		—		—		—			—		33			33
Income (loss) before income taxes and equity in earnings	1,733		361		743		74			53		(901		)	2,063
Equity in net earnings of Kindred at Home	—		—		11		—			—		—			11
Segment earnings (losses)	$	1,733	$	361	$	754	$	74		$	53	$	(901	)	$	2,074

Premium and services revenues derived from our contracts with the federal government, as a percentage of our total premium and services revenues, was approximately 81% for 2018, compared to 79% for 2017, and 75% for 2016.

	Retail		Group and Specialty		Healthcare Services		Individual Commercial		Other Businesses			Eliminations/ Corporate			Consolidated
	(in millions)
2017
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	32,720	$	—	$	—	$	—	$	—		$	—		$	32,720
Group Medicare Advantage	5,155		—		—		—		—			—			5,155
Medicare stand-alone PDP	3,702		—		—		—		—			—			3,702
Total Medicare	41,577		—		—		—		—			—			41,577
Fully-insured	478		5,462		—		947		—			—			6,887
Specialty	—		1,310		—		—		—			—			1,310
Medicaid and other	2,571		—		—		—		35			—			2,606
Total premiums	44,626		6,772		—		947		35			—			52,380
Services revenue:
Provider	—		—		258		—		—			—			258
ASO and other	10		626		—		—		8			—			644
Pharmacy	—		—		80		—		—			—			80
Total services revenue	10		626		338		—		8			—			982
Total revenues—external customers	44,636		7,398		338		947		43			—			53,362
Intersegment revenues
Services	—		20		17,293		—		—			(17,313		)	—
Products	—		—		6,292		—		—			(6,292		)	—
Total intersegment revenues	—		20		23,585		—		—			(23,605		)	—
Investment income	90		31		35		4		87			158			405
Total revenues	44,726		7,449		23,958		951		130			(23,447		)	53,767
Operating expenses:
Benefits	38,218		5,363		—		544		131			(760		)	43,496
Operating costs	4,292		1,590		22,848		201		12			(22,376		)	6,567
Merger termination fee and related costs, net	—		—		—		—		—			(936		)	(936		)
Depreciation and amortization	238		84		143		13		—			(100		)	378
Total operating expenses	42,748		7,037		22,991		758		143			(24,172		)	49,505
Income (loss) from operations	1,978		412		967		193		(13		)	725			4,262
Interest expense	—		—		—		—		—			242			242
Income (loss) before income taxes and equity in earnings	1,978		412		967		193		(13		)	483			4,020
Equity in net earnings of Kindred at Home	—		—		—		—		—			—			—
Segment earnings (losses)	$	1,978	$	412	$	967	$	193	$	(13	)	$	483		$	4,020

	Retail		Group and Specialty		Healthcare Services		Individual Commercial			Other Businesses			Eliminations/ Corporate			Consolidated
	(in millions)
2016
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	31,863	$	—	$	—	$	—		$	—		$	—		$	31,863
Group Medicare Advantage	4,283		—		—		—			—			—			4,283
Medicare stand-alone PDP	4,009		—		—		—			—			—			4,009
Total Medicare	40,155		—		—		—			—			—			40,155
Fully-insured	428		5,405		—		3,064			—			—			8,897
Specialty	—		1,279		—		—			—			—			1,279
Medicaid and other	2,640		12		—		—			38			—			2,690
Total premiums	43,223		6,696		—		3,064			38			—			53,021
Services revenue:
Provider	—		—		278		—			—			—			278
ASO and other	6		643		1		—			10			—			660
Pharmacy	—		—		31		—			—			—			31
Total services revenue	6		643		310		—			10			—			969
Total revenues—external customers	43,229		7,339		310		3,064			48			—			53,990
Intersegment revenues
Services	—		22		18,979		—			—			(19,001		)	—
Products	—		—		5,993		—			—			(5,993		)	—
Total intersegment revenues	—		22		24,972		—			—			(24,994		)	—
Investment income	90		25		30		5			66			173			389
Total revenues	43,319		7,386		25,312		3,069			114			(24,821		)	54,379
Operating expenses:
Benefits	36,783		5,233		—		3,301			617			(927		)	45,007
Operating costs	4,650		1,727		24,073		601			16			(23,894		)	7,173
Merger termination fee and related costs, net	—		—		—		—			—			104			104
Depreciation and amortization	196		82		143		36			1			(104		)	354
Total operating expenses	41,629		7,042		24,216		3,938			634			(24,821		)	52,638
Income (loss) from operations	1,690		344		1,096		(869		)	(520		)	—			1,741
Gain on sale of business	—		—		—		—			—			—			—
Interest expense	—		—		—		—			—			189			189
Income (loss) before income taxes and equity in earnings	1,690		344		1,096		(869		)	(520		)	(189		)	1,552
Equity in net earnings of Kindred at Home	—		—		—		—			—			—			—
Segment earnings (losses)	$	1,690	$	344	$	1,096	$	(869	)	$	(520	)	$	(189	)	$	1,552

Premiums revenue for our Individual Commercial segment for 2016 includes a reduction of $583 million associated with the write-off of commercial risk corridor receivables.

Benefits expense for Other Businesses for 2016 includes $505 million for reserve strengthening associated with our closed block of long-term care insurance policies as discussed more fully in Note 18.

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EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS

12 Months Ended

Dec. 31, 2018

Insurance [Abstract]

EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS

EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS

Premiums associated with our long-duration insurance products accounted for less than 1% of our consolidated premiums and services revenue for the year ended December 31, 2018 and 2017. We use long-duration accounting for life insurance, annuities, certain health and other supplemental products and, prior to its sale in 2018, long-term care policies sold to individuals because they are expected to remain in force for an extended period beyond one year and because premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. As a result, we defer policy acquisition costs, primarily consisting of commissions, and amortize them over the estimated life of the policies in proportion to premiums earned.

In addition, we establish reserves for future policy benefits in recognition of the fact that some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. At policy issuance, these reserves are recognized on a net level premium method based on premium rate increase, interest rate, mortality, morbidity, persistency (the percentage of policies remaining in-force), and maintenance expense assumptions. The assumptions used to determine the liability for future policy benefits are established and locked in at the time each contract is issued and only change if our expected future experience deteriorates to the point that the level of the liability, together with the present value of future gross premiums, are not adequate to provide for future expected policy benefits and maintenance costs (i.e. the loss recognition date). As discussed in Note 2, beginning in 2014, health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model because premiums received in the current year are intended to pay anticipated benefits in that year.

The table below presents deferred acquisition costs and future policy benefits payable associated with our long-duration insurance products for the years ended December 31, 2018 and 2017.

	2018					2017
	Deferred acquisition costs		Future policy benefits payable			Deferred acquisition costs		Future policy benefits payable
	(in millions)
Other long-term assets	$	36	$	—		$	103	$	—
Trade accounts payable and accrued expenses	—		—			—		(56		)
Long-term liabilities	—		(219		)	—		(2,923		)
Total asset (liability)	$	36	$	(219	)	$	103	$	(2,979	)

The decline in the balances of the deferred acquisition costs and future benefits payable reflects the sale of KMG on August 9, 2018. In addition, future policy benefits payable include amounts of $217 million at December 31, 2018 and $199 million at December 31, 2017 which are subject to 100% coinsurance agreements as more fully described in Note 19.

Benefit expense reflects no net increase in future policy benefit payable in 2018, a net reduction of $22 million in 2017 and a net increase of $439 million in 2016. The 2016 amount reflects the net change of $505 million associated with our closed block of long-term care insurance policies, which were sold in 2018 as discussed further below. Amortization of deferred acquisition costs included in operating costs was $48 million in 2018, $71 million in 2017, and $67 million in 2016.

All three years include the effect of the release of reserves and accelerating deferred acquisition amortization costs of existing previously underwritten individual commercial medical members transitioning to policies compliant with the Health Care Reform Law. Deferred acquisition costs included $3 million associated with our individual commercial medical policies at December 31, 2017. Future policy benefits payable associated with our individual commercial medical policies were $19 million at December 31, 2017. There were no remaining balances at December 31, 2018. We have exited our individual commercial medical business effective January 1, 2018.

Future policy benefits payable included$2.3 billion at December 31, 2017associated with a non-strategic closed block of long-term care insurance policies acquired in connection with the 2007 acquisition of KMG. As described in Note 3, on August 9, 2018, we completed the sale of KMG. Future policy benefits payable included amounts charged to accumulated other comprehensive income for an additional liability that would exist on our closed-block of long-term care insurance policies if unrealized gains on the sale of the investments backing such products had been realized and the proceeds reinvested at then current yields. There was additional liability of $168 millionat December 31, 2017. Amounts charged to accumulated other comprehensive income are net of applicable deferred taxes.

Long-term care insurance policies provided nursing home and home health coverage for which premiums are collected many years in advance of benefits paid, if any. Therefore, our actual claims experience will emerge many years after assumptions have been established. The risk of a deviation of the actual premium rate increase, interest, morbidity, mortality, persistency, and maintenance expense assumptions from those assumed in our reserves were particularly significant to our closed block of long-term care insurance policies. We monitored the loss experience of these long-term care insurance policies and, when necessary, applied for premium rate increases through a regulatory filing and approval process in the jurisdictions in which such products were sold. To the extent premium rate increases, interest rates, and/or loss experience varied from our loss recognition date assumptions, material adjustments to reserves were required.

During 2016, we recorded a loss for a premium deficiency. The premium deficiency was based on current and anticipated experience that had deteriorated from our locked-in assumptions from the previous December 31, 2013 loss recognition date, particularly as they related to emerging experience indicating longer claims duration, a prolonged lower interest rate environment, and an increase in policyholder life expectancies. Based on this deterioration, we determined that our existing future policy benefits payable, together with the present value of future gross premiums, associated with our closed block of long-term care insurance policies were not adequate to provide for future policy benefits and maintenance costs under these policies; therefore we unlocked and modified our assumptions based on current expectations. Accordingly, during 2016 we recorded $505 million of additional benefits expense, with a corresponding increase in future policy benefits payable of $659 million partially offset by a related reinsurance recoverable of $154 million included in other long-term assets. During 2017, we performed loss recognition testing comparing our existing future policy benefits payable with the present value of future gross premiums associated with our closed block of long-term care insurance policies and determined that no premium deficiency existed at December 31, 2017.

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REINSURANCE

12 Months Ended

Dec. 31, 2018

Insurance [Abstract]

REINSURANCE

REINSURANCE

Certain blocks of insurance assumed in acquisitions, primarily life, annuities in run-off status and, prior to its sale in 2018, long-term care, are subject to reinsurance where some or all of the underwriting risk related to these policies has been ceded to a third party. In addition, a large portion of our reinsurance takes the form of 100% coinsurance agreements where, in addition to all of the underwriting risk, all administrative responsibilities, including premium collections and claim payment, have also been ceded to a third party. We acquired these policies and related reinsurance agreements with the purchase of stock of companies in which the policies were originally written. We acquired these companies for business reasons unrelated to these particular policies, including the companies’ other products and licenses necessary to fulfill strategic plans.

A reinsurance agreement between two entities transfers the underwriting risk of policyholder liabilities to a reinsurer while the primary insurer retains the contractual relationship with the ultimate insured. As such, these reinsurance agreements do not completely relieve us of our potential liability to the ultimate insured. However, given the transfer of underwriting risk, our potential liability is limited to the credit exposure which exists should the reinsurer be unable to meet its obligations assumed under these reinsurance agreements.

Reinsurance recoverables represent the portion of future policy benefits payable and benefits payable that are covered by reinsurance. Amounts recoverable from reinsurers are estimated in a manner consistent with the methods used to determine future policy benefits payable as detailed in Note 2. Reinsurance recoverables, included in other current and long-term assets, were $314 million at December 31, 2018 and $824 million at December 31, 2017. The decline in the balances reflects the sale of KMG on August 9, 2018. The percentage of these reinsurance recoverables resulting from 100% coinsurance agreements was approximately 99% at December 31, 2018 and approximately 33% at December 31, 2017. Premiums ceded were $976 million in 2018, $969 million in 2017 and $842 million in 2016. Benefits ceded were $980 million in 2018, $844 million in 2017, and $767 million in 2016. Ceded premium and benefits reflect the activity associated with ceding all risk under a Medicaid contract to a third party reinsurer.

We evaluate the financial condition of our reinsurers on a regular basis. Protective Life Insurance Company with $177 million in reinsurance recoverables is well-known and well-established with a AM Best rating of A+ (superior) at December 31, 2018 . The remaining reinsurance recoverables of $137 million are divided between 10 other reinsurers, with $110 million subject to funds withheld accounts or other financial guarantees supporting the repayment of these amounts.

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QUARTERLY FINANCIAL INFORMATION (Unaudited)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

QUARTERLY FINANCIAL INFORMATION (Unaudited)

QUARTERLY FINANCIAL INFORMATION

(Unaudited)

A summary of our quarterly unaudited results of operations for the years ended December 31, 2018 and 2017 follows:

	2018
	First		Second		Third		Fourth
	(in millions, except per share results)
Total revenues	$	14,279	$	14,259	$	14,206	$	14,168
Income before income taxes and equity in net earnings	707		19		901		436
Net income	491		193		644		355
Basic earnings per common share	$	3.56	$	1.40	$	4.68	$	2.60
Diluted earnings per common share (1)	$	3.53	$	1.39	$	4.65	$	2.58
	2017
	First		Second		Third		Fourth
	(in millions, except per share results)
Total revenues	$	13,762	$	13,534	$	13,282	$	13,189
Income before income taxes	1,689		1,042		799		490
Net income	1,115		650		499		184
Basic earnings per common share (1)	$	7.54	$	4.49	$	3.46	$	1.30
Diluted earnings per common share (1)	$	7.49	$	4.46	$	3.44	$	1.29

(1) The calculation of earnings per common share is based on the weighted average shares outstanding during each quarter and, accordingly, the sum may not equal the total for the year.

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SCHEDULE I-PARENT COMPANY FINANCIAL INFORMATION

12 Months Ended

Dec. 31, 2018

Condensed Financial Information Disclosure [Abstract]

SCHEDULE I-PARENT COMPANY FINANCIAL INFORMATION

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED BALANCE SHEETS

	December 31,
	2018			2017
	(in millions, except share amounts)
ASSETS
Current assets:
Cash and cash equivalents	$	265		$	383
Investment securities	313			305
Receivable from operating subsidiaries	1,306			1,042
Other current assets	628			245
Total current assets	2,512			1,975
Property and equipment, net	1,209			1,091
Investments in subsidiaries	16,951			16,810
Equity method investment in Kindred at Home	1,047			—
Other long-term assets	359			426
Total assets	$	22,078		$	20,302
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Payable to operating subsidiaries	$	4,487		$	4,311
Current portion of notes payable to operating subsidiaries	28			28
Book overdraft	38			41
Short-term debt	1,694			150
Other current liabilities	791			896
Total current liabilities	7,038			5,426
Long-term debt	4,375			4,770
Other long-term liabilities	504			264
Total liabilities	11,917			10,460
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	—			—
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,594,841 shares issued at December 31, 2018 and 198,572,458 shares issued at December 31, 2017	33			33
Capital in excess of par value	2,535			2,445
Retained earnings	15,072			13,670
Accumulated other comprehensive income (loss)	(159		)	19
Treasury stock, at cost, 63,028,169 shares at December 31, 2018 and 60,893,762 shares at December 31, 2017	(7,320		)	(6,325		)
Total stockholders’ equity	10,161			9,842
Total liabilities and stockholders’ equity	$	22,078		$	20,302

See accompanying notes to the parent company financial statements.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED STATEMENTS OF INCOME

	For the year ended December 31,
	2018			2017			2016
	(in millions)
Revenues:
Management fees charged to operating subsidiaries	$	1,666		$	1,864		$	1,683
Investment and other income, net	30			57			42
	1,696			1,921			1,725
Expenses:
Operating costs	1,468			1,801			1,519
Merger termination fee and related costs, net	—			(936		)	104
Depreciation	342			332			302
Interest	218			243			189
	2,028			1,440			2,114
Other expense, net	33			—			—
Loss on sale of business	782			—			—
(Loss) income before income taxes and equity in net earnings of subsidiaries	(1,147		)	481			(389		)
(Benefit) provision for income taxes	(542		)	61			(107		)
(Loss) income before equity in net earnings of subsidiaries	(605		)	420			(282		)
Equity in net earnings of subsidiaries	2,277			2,028			896
Equity in net earnings of Kindred at Home	11			—			—
Net income	$	1,683		$	2,448		$	614

See accompanying notes to the parent company financial statements.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED STATEMENTS OF COMPREHENSIVE INCOME

	For the year ended December 31,
	2018			2017			2016
	(in millions)
Net income	$	1,683		$	2,448		$	614
Other comprehensive income (loss):
Change in gross unrealized investment losses/gains	(189		)	149			(101		)
Effect of income taxes	51			(55		)	38
Total change in unrealized investment gains/losses, net of tax	(138		)	94			(63		)
Reclassification adjustment for net realized gains included in investment income	(53		)	(14		)	(96		)
Effect of income taxes	17			5			35
Total reclassification adjustment, net of tax	(36		)	(9		)	(61		)
Other comprehensive (loss) income, net of tax	(174		)	85			(124		)
Comprehensive income attributable to our equity method investment in Kindred at Home	(4		)	—			—
Comprehensive income	$	1,505		$	2,533		$	490

See accompanying notes to the parent company financial statements.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED STATEMENTS OF CASH FLOWS

	For the year ended December 31,
	2018			2017			2016
	(in millions)
Net cash provided by operating activities	$	2,719		$	2,423		$	1,848
Cash flows from investing activities:
Acquisitions, net of cash acquired	(354		)	—			—
Acquisitions, equity method investment in Kindred at Home	(1,095		)	—			—
Capital contributions to operating subsidiaries	(697		)	(695		)	(895		)
Purchases of investment securities	(145		)	(53		)	(151		)
Proceeds from sale of investment securities	35			—			25
Maturities of investment securities	59			51			143
Purchases of property and equipment, net	(465		)	(359		)	(382		)
Net cash used in investing activities	(2,662		)	(1,056		)	(1,260		)
Cash flows from financing activities:
Proceeds from issuance of senior notes, net	—			1,779			—
Proceeds from issuance (repayments) of commercial paper, net	485			(153		)	(2		)
Proceeds from term loan	1,000			—			—
Repayment of term loan	(350		)	—			—
Repayment of long-term debt	—			(800		)	—
Change in book overdraft	(3		)	3			5
Common stock repurchases	(1,090		)	(3,365		)	(104		)
Dividends paid	(265		)	(220		)	(177		)
Proceeds from stock option exercises and other	48			62			11
Net cash used in financing activities	(175		)	(2,694		)	(267		)
(Decrease) increase in cash and cash equivalents	(118		)	(1,327		)	321
Cash and cash equivalents at beginning of year	383			1,710			1,389
Cash and cash equivalents at end of year	$	265		$	383		$	1,710

See accompanying notes to the parent company financial statements.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

NOTES TO CONDENSED FINANCIAL STATEMENTS

BASIS OF PRESENTATION

Parent company financial information has been derived from our consolidated financial statements and excludes the accounts of all operating subsidiaries. This information should be read in conjunction with our consolidated financial statements.

TRANSACTIONS WITH SUBSIDIARIES

Management Fee

Through intercompany service agreements approved, if required, by state regulatory authorities, Humana Inc., our parent company, charges a management fee for reimbursement of certain centralized services provided to its subsidiaries including information systems, disbursement, investment and cash administration, marketing, legal, finance, and medical and executive management oversight.

Dividends

Cash dividends received from subsidiaries and included as a component of net cash provided by operating activities were $2.3 billion in 2018, $1.4 billion in 2017, and $0.8 billion in 2016.

Guarantee

Through indemnity agreements approved by state regulatory authorities, certain of our regulated subsidiaries generally are guaranteed by our parent company in the event of insolvency for: (1) member coverage for which premium payment has been made prior to insolvency; (2) benefits for members then hospitalized until discharged; and (3) payment to providers for services rendered prior to insolvency. Our parent has also guaranteed the obligations of our military services subsidiaries and funding to maintain required statutory capital levels of certain other regulated subsidiaries.

REGULATORY REQUIREMENTS

Certain of our subsidiaries operate in states that regulate the payment of dividends, loans, or other cash transfers to Humana Inc., our parent company, and require minimum levels of equity as well as limit investments to approved securities. The amount of dividends that may be paid to Humana Inc. by these subsidiaries, without prior approval by state regulatory authorities, or ordinary dividends, is limited based on the entity’s level of statutory income and statutory capital and surplus. If the dividend, together with other dividends paid within the preceding twelve months, exceeds a specified statutory limit or is paid from sources other than earned surplus, it is generally considered an extraordinary dividend requiring prior regulatory approval. In most states, prior notification is provided before paying a dividend even if approval is not required.

Although minimum required levels of equity are largely based on premium volume, product mix, and the quality of assets held, minimum requirements vary significantly at the state level. Our state regulated insurances subsidiaries had aggregate statutory capital and surplus of approximately$7.6 billion and $8.0 billion as of December 31, 2018 and 2017, respectively, which exceeded aggregate minimum regulatory requirements of$5.2 billion and $4.8 billion, respectively. The amount of ordinary dividends that may be paid to our parent company in2019is approximately$1 billionin the aggregate. The amount, timing and mix of ordinary and extraordinary dividend payments will vary due to state regulatory requirements, the level of excess statutory capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix. Actual dividends that were paid to our parent company were approximately$2.3 billion in 2018, $1.4 billion in 2017, and $0.8 billionin 2016.

Our use of operating cash flows derived from our non-insurance subsidiaries, such as in our Healthcare Services segment, is generally not restricted by state departments of insurance (or comparable state regulators).

ACQUISITIONS AND DIVESTITURES

Refer to Note 3 of the notes to consolidated financial statements in this Annual Report on Form 10-K for a description of certain acquisitions and divestitures. During 2018, 2017 and 2016, we funded certain non-regulated subsidiary acquisitions with contributions from Humana Inc., our parent company, included in capital contributions in the condensed statement of cash flows.

INCOME TAXES

Refer to Note 11 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of income taxes.

DEBT

Refer to Note 12 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of debt.

STOCKHOLDER’S EQUITY

Refer to Note 15 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of stockholders’ equity, including stock repurchases and stockholder dividends.

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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2018

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS

For the Years Ended December 31, 2018, 2017, and 2016

(in millions)

						Additions
	Balance  at Beginning of Period			Acquired/(Disposed) Balances		Charged (Credited)  to Costs and Expenses			Charged  to Other Accounts (1)			Deductions or Write-offs			Balance at End  of Period
Allowance for loss on receivables:
2018	$	96		$	—	$	36		$	(29	)	$	(24	)	$	79
2017	118			—		20			(10		)	(32		)	96
2016	101			—		39			19			(41		)	118
Deferred tax asset valuation allowance:
2018	(49		)	—		(5		)	—			—			(54		)
2017	(49		)	—		—			—			—			(49		)
2016	(42		)	—		(7		)	—			—			(49		)

(1) Represents changes in retroactive membership adjustments to premiums revenue and contractual allowances adjustments to services revenue as more fully described in Note 2 to the consolidated financial statements included in this annual report on Form 10-K.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

Our financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America. Our consolidated financial statements include the accounts of Humana Inc. and subsidiaries that the Company controls, including variable interest entities associated with medical practices for which we are the primary beneficiary. We do not own many of our medical practices but instead enter into exclusive management agreements with the affiliated Professional Associations, or P.A.s, that operate these medical practices. Based upon the provisions of these agreements, these affiliated P.A.s are variable interest entities and we are the primary beneficiary, and accordingly we consolidate the affiliated P.A.s. All significant intercompany balances and transactions have been eliminated.

The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America requires us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The areas involving the most significant use of estimates are the estimation of benefits payable, the impact of risk adjustment provisions related to our Medicare contracts, the valuation and related impairment recognition of investmentsecurities, and the valuation and related impairment recognition of long-lived assets, including goodwill. These estimates are based on knowledge of current events and anticipated future events, and accordingly, actual results may ultimately differ materially from those estimates.

Health Care Reform

Health Care Reform

The Patient Protection and Affordable Care Act and The Health Care and Education Reconciliation Act of 2010 (which we collectively refer to as the Health Care Reform Law) enacted significant reforms to various aspects of the U.S. health insurance industry. Certain of these reforms became effective January 1, 2014, including an annual insurance industry premium-based fee and the establishment of federally-facilitated or state-based exchanges. Operating results for our individual commercial medical business compliant with the Health Care Reform Law were challenged primarily due to unanticipated modifications in the program subsequent to the passing of the Health Care Reform Law, resulting in higher covered population morbidity and the ensuing enrollment and claims issues causing volatility in claims experience. As a result of these and other factors, we exited our individual commercial medical business effective January 1, 2018.

The annual premium-based fee on health insurers is not deductible for tax purposes. We estimate a liability for the health insurance industry fee and record it in full once qualifying insurance coverage is provided in the applicable calendar year in which the fee is payable with a corresponding deferred cost that is amortized ratably to expense over the same calendar year. We record the liability for the health insurance industry fee in trade accounts payable and accrued expenses and record the deferred cost in other current assets in our consolidated financial statements. We pay the health insurance industry fee in September or October of each year. The Consolidated Appropriations Act enacted on December 18, 2015, included a one-time one year suspension in 2017 of the health insurance industry fee. In 2018, we paid the federal government $1.04 billion for the annual health insurance industry fee attributed to calendar year 2018. In 2016, we paid the federal government $916 million for the annual health insurance industry fee attributed to calendar year 2016. The Continuing Resolution bill, H.R. 195, enacted on January 22, 2018, included a one year suspension in 2019 of the health insurance industry fee, but under current law, the fee is scheduled to resume in calendar year 2020.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents include cash, time deposits, money market funds, commercial paper, other money market instruments, and certain U.S. Government securities with an original maturity of three months or less. Carrying value approximates fair value due to the short-term maturity of the investments.

Investment Securities

Investment Securities

Investment securities, which consist entirely of debt securities, have been categorized as available for sale and, as a result, are stated at fair value. Investment securities available for current operations are classified as current assets. Investment securities available for our long-term insurance products and professional liability funding requirements, as well as restricted statutory deposits, are classified as long-term assets. For the purpose of determining gross realized gains and losses, which are included as a component of investment income in the consolidated statements of income, the cost of investment securities sold is based upon specific identification. Unrealized holding gains and losses, net of applicable deferred taxes, are included as a component of stockholders’ equity and comprehensive income until realized from a sale or other-than-temporary impairment.

Under the other-than-temporary impairment model for debt securities held, we recognize an impairment loss in income in an amount equal to the full difference between the amortized cost basis and the fair value when we have the intent to sell the debt security or it is more likely than not we will be required to sell the debt security before recovery of our amortized cost basis. However, if we do not intend to sell the debt security, we evaluate the expected cash flows to be received as compared to amortized cost and determine if a credit loss has occurred. In the event of a credit loss, only the amount of the impairment associated with the credit loss is recognized currently in income with the remainder of the loss recognized in other comprehensive income.

When we do not intend to sell a security in an unrealized loss position, potential other-than-temporary impairment is considered using a variety of factors, including the length of time and extent to which the fair value has been less than cost; adverse conditions specifically related to the industry, geographic area or financial condition of the issuer or underlying collateral of a security; payment structure of the security; changes in credit rating of the security by the rating agencies; the volatility of the fair value changes; and changes in fair value of the security after the balance sheet date. For debt securities, we take into account expectations of relevant market and economic data. For example, with respect to mortgage and asset-backed securities, such data includes underlying loan level data and structural features such as seniority and other forms of credit enhancements. A decline in fair value is considered other-than-temporary when we do not expect to recover the entire amortized cost basis of the security. We estimate the amount of the credit loss component of a debt security as the difference between the amortized cost and the present value of the expected cash flows of the security. The present value is determined using the best estimate of future cash flows discounted at the implicit interest rate at the date of purchase.

Receivables and Revenue Recognition

Receivables and Revenue Recognition

We generally establish one-year commercial membership contracts with employer groups, subject to cancellation by the employer group on 30-day written notice. Our Medicare contracts with CMS renew annually. Our military services contracts with the federal government and certain contracts with various state Medicaid programs generally are multi-year contracts subject to annual renewal provisions.

Premiums Revenue

We receive monthly premiums from the federal government and various states according to government specified payment rates and various contractual terms. We bill and collect premium from employer groups and members in our Medicare and other individual products monthly. Changes in premium revenues resulting from the periodic changes in risk-adjustment scores derived from medical diagnoses for our membership are estimated by projecting the ultimate annual premium and are recognized ratably during the year, with adjustments each period to reflect changes in the ultimate premium. Receivables or payables are classified as current or long-term in our consolidated balance sheet based on the timing of the expected settlement.

Premiums revenue is estimated by multiplying the membership covered under the various contracts by the contractual rates. Premiums revenue is recognized as income in the period members are entitled to receive services, and is net of estimated uncollectible amounts, retroactive membership adjustments, and adjustments to recognize rebates under the minimum benefit ratios required under the Health Care Reform Law. We estimate policyholder rebates by projecting calendar year minimum benefit ratios for the small group and large group markets, as defined by the Health Care Reform Law using a methodology prescribed by HHS, separately by state and legal entity. Medicare Advantage products are also subject to minimum benefit ratio requirements under the Health Care Reform Law. Estimated calendar year rebates recognized ratably during the year are revised each period to reflect current experience. Retroactive membership adjustments result from enrollment changes not yet processed, or not yet reported by an employer group or the government. We routinely monitor the collectibility of specific accounts, the aging of receivables, historical retroactivity trends, estimated rebates, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. Premiums received prior to the service period are recorded as unearned revenues.

Medicare Part D

We cover prescription drug benefits in accordance with Medicare Part D under multiple contracts with CMS. The payments we receive monthly from CMS and members, which are determined from our annual bid, represent amounts for providing prescription drug insurance coverage. We recognize premiums revenue for providing this insurance coverage ratably over the term of our annual contract. Our CMS payment is subject to risk sharing through the Medicare Part D risk corridor provisions. In addition, receipts for reinsurance and low-income cost subsidies as well as receipts for certain discounts on brand name prescription drugs in the coverage gap represent payments for prescription drug costs for which we are not at risk.

The risk corridor provisions compare costs targeted in our bids to actual prescription drug costs, limited to actual costs that would have been incurred under the standard coverage as defined by CMS. Variances exceeding certain thresholds may result in CMS making additional payments to us or require us to refund to CMS a portion of the premiums we received. As risk corridor provisions are considered in our overall annual bid process, we estimate and recognize an adjustment to premiums revenue related to these provisions based upon pharmacy claims experience. We record a receivable or payable at the contract level and classify the amount as current or long-term in our consolidated balance sheets based on the timing of expected settlement.

Reinsurance and low-income cost subsidies represent funding from CMS in connection with the Medicare Part D program for which we assume no risk. Reinsurance subsidies represent funding from CMS for its portion of prescription drug costs which exceed the member’s out-of-pocket threshold, or the catastrophic coverage level. Low-income cost subsidies represent funding from CMS for all or a portion of the deductible, the coinsurance and co-payment amounts above the out-of-pocket threshold for low-income beneficiaries. Monthly prospective payments from CMS for reinsurance and low-income cost subsidies are based on assumptions submitted with our annual bid. A reconciliation and related settlement of CMS’s prospective subsidies against actual prescription drug costs we paid is made after the end of the year. The Health Care Reform Law mandates consumer discounts of 50% on brand name prescription drugs for Part D plan participants in the coverage gap. These discounts are funded by CMS and pharmaceutical manufacturers while we administer the application of these funds. We account for these subsidies and discounts as a deposit in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2018, subsidy and discount payments of $10.3 billion exceeded reimbursements of $9.6 billion by $0.7 billion. For 2017, subsidy and discount reimbursements of $12.1 billion exceeded payments of $10.2 billion by $1.9 billion. For 2016, subsidy and discount reimbursements of $11.1 billion exceeded payments of $10.0 billion by $1.1 billion. We do not recognize premiums revenue or benefit expenses for these subsidies or discounts. Receipt and payment activity is accumulated at the contract level and recorded in our consolidated balance sheets in other current assets or trade accounts payable and accrued expenses depending on the contract balance at the end of the reporting period.

Settlement of the reinsurance and low-income cost subsidies as well as the risk corridor payment is based on a reconciliation made approximately9months after the close of each calendar year. Settlement with CMS for brand name prescription drug discounts is based on a reconciliation made approximately 14 to 18 months after the close of each calendar year. We continue to revise our estimates with respect to the risk corridor provisions based on subsequent period pharmacy claims data. See Note 7 for detail regarding amounts recorded to our consolidated balance sheets related to the risk corridor settlement and subsidies from CMS with respect to the Medicare Part D program.

Services Revenue

Patient services revenue

Patient services include injury and illness care and related services as well as other healthcare services related to customer needs or as required by law. Patient services revenues are recognized in the period services are provided to the customer and are net of contractual allowances.

Administrative services fees

Administrative services fees cover the processing of claims, offering access to our provider networks and clinical programs, and responding to customer service inquiries from members of self-funded groups. Revenues from providing administration services, also known as administrative services only, or ASO, are recognized in the period services are performed and are net of estimated uncollectible amounts. ASO fees are estimated by multiplying the membership covered under the various contracts by the contractual rates. Under ASO contracts, self-funded employers retain the risk of financing substantially all of the cost of health benefits. However, many ASO customers purchase stop loss insurance coverage from us to cover catastrophic claims or to limit aggregate annual costs. Accordingly, we have recorded premiums revenue and benefits expense related to these stop loss insurance contracts. We routinely monitor the collectibility of specific accounts, the aging of receivables, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. ASO fees received prior to the service period are recorded as unearned revenues.

Under our TRICARE contracts with the Department of Defense (DoD) we provide administrative services, including offering access to our provider networks and clinical programs, claim processing, customer service, enrollment, and other services, while the federal government retains all of the risk of the cost of health benefits. We account for revenues under our contracts net of estimated health care costs similar to an administrative services fee only agreement. Our contracts include fixed administrative services fees and incentive fees and penalties. Administrative services fees are recognized as services are performed. 

Our TRICARE members are served by both in-network and out-of-network providers in accordance with our contracts. We pay health care costs related to these services to the providers and are subsequently reimbursed by the DoD for such payments. We account for the payments of the federal government’s claims and the related reimbursements under deposit accounting in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2018, health care cost reimbursements and payments were each approximately $5.6 billion, with reimbursements exceeding payments by $38 million for the year. For 2017, health care cost reimbursements and payments were each approximately$3.4 billion, with reimbursements exceeding payments by $11 million for the year. For 2016, health care cost reimbursements and payments were each approximately $3.3 billion with payments exceeding reimbursements by $25 million for the year.

Receivables

Receivables, including premium receivables, patient services revenue receivables, and ASO fee receivables, are shown net of allowances for estimated uncollectible accounts, retroactive membership adjustments, and contractual allowances.

Other Current Assets

Other Current Assets

Other current assets includes amounts associated with Medicare Part D as discussed above and in Note 7, rebates due from pharmaceutical manufacturers and other amounts due within one year. We accrue pharmaceutical rebates as they are earned based on contractual terms and usage of the product.

Policy Acquisition Costs

Policy Acquisition Costs

Policy acquisition costs are those costs that relate directly to the successful acquisition of new and renewal insurance policies. Such costs include commissions, costs of policy issuance and underwriting, and other costs we incur to acquire new business or renew existing business. We expense policy acquisition costs related to our employer-group prepaid health services policies as incurred. These short-duration employer-group prepaid health services policies typically have a 1-year term and may be canceled upon 30 days notice by the employer group.

Life insurance, annuities, certain health and other supplemental, and, prior to the sale of our KMG subsidiary in 2018, long term care policies sold to individuals are accounted for as long-duration insurance products because they are expected to remain in force for an extended period beyond one year and premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. As a result, we defer policy acquisition costs, primarily consisting of commissions, and amortize them over the estimated life of the policies in proportion to premiums earned. Deferred acquisition costs are reviewed to determine if they are recoverable from future income.

Long-Lived Assets

Long-Lived Assets

Property and equipment is recorded at cost. Gains and losses on sales or disposals of property and equipment are included in operating costs. Certain costs related to the development or purchase of internal-use software are capitalized. Depreciation is computed using the straight-line method over estimated useful lives ranging from 3 to 10 years for equipment, 3 to 5 years for computer software, and 10 to 20 years for buildings. Improvements to leased facilities are depreciated over the shorter of the remaining lease term or the anticipated life of the improvement.

We periodically review long-lived assets, including property and equipment and definite-lived intangible assets, for impairment whenever adverse events or changes in circumstances indicate the carrying value of the asset may not be recoverable. Losses are recognized for a long-lived asset to be held and used in our operations when the undiscounted future cash flows expected to result from the use of the asset are less than its carrying value. We recognize an impairment loss based on the excess of the carrying value over the fair value of the asset. A long-lived asset held for sale is reported at the lower of the carrying amount or fair value less costs to sell. Depreciation expense is not recognized on assets held for sale. Losses are recognized for a long-lived asset to be abandoned when the asset ceases to be used. In addition, we periodically review the estimated lives of all long-lived assets for reasonableness.

Equity Method Investments

Equity Method Investments

We use the equity method of accounting for equity investments in companies where we are able to exercise significant influence, but not control, over operating and financial policies of the investee. Judgment regarding the level of influence over each equity method investment includes considering key factors such as our ownership interest, representation on the board of directors, organizational structure, participation in policy-making decisions and material intra-entity transactions.

Generally, under the equity method, original investments in these entities are recorded at cost and subsequently adjusted by our share of equity in income or losses after the date of acquisition as well as capital contributions to and distributions from these companies. Our proportionate share of the net income or loss of these companies is included in consolidated net income. Investment amounts in excess of our share of an investee's net assets are amortized over the life of the related asset creating the excess. Excess goodwill is not amortized.

We evaluate equity method investments for impairment whenever events or changes in circumstances indicate that the carrying amount of the investment might not be recoverable. Factors considered by us when reviewing an equity method investment for impairment include the length of time (duration) and the extent (severity) to which the fair value of the equity method investment has been less than carrying value, the investee’s financial condition and near-term prospects and the intent and ability to hold the investment for a period of time sufficient to allow for anticipated recovery. An impairment that is other-than-temporary is recognized in the period identified.

Goodwill and Definite-Lived Intangible Assets

Goodwill and Definite-Lived Intangible Assets

Goodwill represents the unamortized excess of cost over the fair value of the net tangible and other intangible assets acquired. We are required to test at least annually for impairment at a level of reporting referred to as the reporting unit, and more frequently if adverse events or changes in circumstances indicate that the asset may be impaired. A reporting unit either is our operating segments or one level below the operating segments, referred to as a component, which comprise our reportable segments. A component is considered a reporting unit if the component constitutes a business for which discrete financial information is available that is regularly reviewed by management. We aggregate the components of an operating segment into one reporting unit if they have similar economic characteristics. Goodwill is assigned to the reporting units that are expected to benefit from the specific synergies of the business combination.

We use the one-step process to review goodwill for impairment to determine both the existence and amount of goodwill impairment, if any. Impairment tests are performed, at a minimum, in the fourth quarter of each year supported by our long-range business plan and annual planning process. We rely on an evaluation of future discounted cash flows to determine fair value of our reporting units. The fair value of our reporting units with significant goodwill exceeded carrying amounts by a substantial margin. A 100 basis point increase in the discount rate would not have a significant impact on the amount of margin for any of our reporting units with significant goodwill, with the exception of our clinical and provider reporting units in our Healthcare Services segment. The margin on the clinical reporting unit would decline to less than 10% after factoring in a 100 basis point increase in the discount rate. The provider reporting unit, while not falling beneath this threshold, was closer than any of our other reporting units. The clinical and provider reporting units account for $524 million and $730 million, respectively, of goodwill. Impairment tests completed for 2018, 2017, and 2016 did not result in an impairment loss.

Definite-lived intangible assets primarily relate to acquired customer contracts/relationships and are included with other long-term assets in the consolidated balance sheets. Definite-lived intangible assets are amortized over the useful life generally using the straight-line method. We review definite-lived intangible assets for impairment under our long-lived asset policy.

Benefits Payable and Benefits Expense Recognition

Benefits Payable and Benefits Expense Recognition

Benefits expense includes claim payments, capitation payments, pharmacy costs net of rebates, allocations of certain centralized expenses and various other costs incurred to provide health insurance coverage to members, as well as estimates of future payments to hospitals and others for medical care and other supplemental benefits provided on or prior to the balance sheet date. Capitation payments represent monthly contractual fees disbursed to primary care and other providers who are responsible for providing medical care to members. Pharmacy costs represent payments for members’ prescription drug benefits, net of rebates from drug manufacturers. Receivables for such pharmacy rebates are included in other current assets in our consolidated balance sheets. Other supplemental benefits include dental, vision, and other supplemental health and financial protection products.

We estimate the costs of our benefits expense payments using actuarial methods and assumptions based upon claim payment patterns, medical cost inflation, historical developments such as claim inventory levels and claim receipt patterns, and other relevant factors, and record benefit reserves for future payments. We continually review estimates of future payments relating to claims costs for services incurred in the current and prior periods and make necessary adjustments to our reserves.

Benefits expense is recognized in the period in which services are provided and includes an estimate of the cost of services which have been incurred but not yet reported, or IBNR. Our reserving practice is to consistently recognize the actuarial best point estimate within a level of confidence required by actuarial standards. Actuarial standards of practice generally require a level of confidence such that the liabilities established for IBNR have a greater probability of being adequate versus being insufficient, or such that the liabilities established for IBNR are sufficient to cover obligations under an assumption of moderately adverse conditions. Adverse conditions are situations in which the actual claims are expected to be higher than the otherwise estimated value of such claims at the time of the estimate. Therefore, in many situations, the claim amounts ultimately settled will be less than the estimate that satisfies the actuarial standards of practice.

We develop our estimate for IBNR using actuarial methodologies and assumptions, primarily based upon historical claim experience. Depending on the period for which incurred claims are estimated, we apply a different method in determining our estimate. For periods prior to the most recent two months, the key assumption used in estimating our IBNR is that the completion factor pattern remains consistent over a rolling 12-month period after adjusting for known changes in claim inventory levels and known changes in claim payment processes. Completion factors result from the calculation of the percentage of claims incurred during a given period that have historically been adjudicated as of the reporting period. For the most recent two months, the incurred claims are estimated primarily from a trend analysis based upon per member per month claims trends developed from our historical experience in the preceding months, adjusted for known changes in estimates of recent hospital and drug utilization data, provider contracting changes, changes in benefit levels, changes in member cost sharing, changes in medical management processes, product mix, and weekday seasonality.

The completion factor method is used for the months of incurred claims prior to the most recent two months because the historical percentage of claims processed for those months is at a level sufficient to produce a consistently reliable result. Conversely, for the most recent two months of incurred claims, the volume of claims processed historically is not at a level sufficient to produce a reliable result, which therefore requires us to examine historical trend patterns as the primary method of evaluation. Changes in claim processes, including recoveries of overpayments, receipt cycle times, claim inventory levels, outsourcing, system conversions, and processing disruptions due to weather or other events affect views regarding the reasonable choice of completion factors. Claim payments to providers for services rendered are often net of overpayment recoveries for claims paid previously, as contractually allowed. Claim overpayment recoveries can result from many different factors, including retroactive enrollment activity, audits of provider billings, and/or payment errors. Changes in patterns of claim overpayment recoveries can be unpredictable and result in completion factor volatility, as they often impact older dates of service. The receipt cycle time measures the average length of time between when a medical claim was initially incurred and when the claim form was received. Increases in electronic claim submissions from providers decrease the receipt cycle time. If claims are submitted or processed on a faster (slower) pace than prior periods, the actual claim may be more (less) complete than originally estimated using our completion factors, which may result in reserves that are higher (lower) than required.

Medical cost trends potentially are more volatile than other segments of the economy. The drivers of medical cost trends include increases in the utilization of hospital facilities, physician services, new higher priced technologies and medical procedures, and new prescription drugs and therapies, as well as the inflationary effect on the cost per unit of each of these expense components. Other external factors such as government-mandated benefits or other regulatory changes, the tort liability system, increases in medical services capacity, direct to consumer advertising for prescription drugs and medical services, an aging population, lifestyle changes including diet and smoking, catastrophes, and epidemics also may impact medical cost trends. Internal factors such as system conversions, claims processing cycle times, changes in medical management practices and changes in provider contracts also may impact our ability to accurately predict estimates of historical completion factors or medical cost trends. All of these factors are considered in estimating IBNR and in estimating the per member per month claims trend for purposes of determining the reserve for the most recent two months. Additionally, we continually prepare and review follow-up studies to assess the reasonableness of the estimates generated by our process and methods over time. The results of these studies are also considered in determining the reserve for the most recent two months. Each of these factors requires significant judgment by management.

We reassess the profitability of our contracts for providing insurance coverage to our members when current operating results or forecasts indicate probable future losses. We establish a premium deficiency reserve in current operations to the extent that the sum of expected future costs, claim adjustment expenses, and maintenance costs exceeds related future premiums under contracts without consideration of investment income. For purposes of determining premium deficiencies, contracts are grouped in a manner consistent with our method of acquiring, servicing, and measuring the profitability of such contracts. Losses recognized as a premium deficiency result in a beneficial effect in subsequent periods as operating losses under these contracts are charged to the liability previously established. Because the majority of our member contracts renew annually, we would not record a material premium deficiency reserve, except when unanticipated adverse events or changes in circumstances indicate otherwise. In 2016, we increased our existing $176 million premium deficiency reserve for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year by $208 million. During 2016, the $384 million current period losses were applied to the premium deficiency liability for the 2016 coverage year.

We believe our benefits payable are adequate to cover future claims payments required. However, such estimates are based on knowledge of current events and anticipated future events. Therefore, the actual liability could differ materially from the amounts provided.

Future policy benefits payable

Future policy benefits payable

Future policy benefits payable include liabilities for long-duration insurance policies including life insurance, annuities, certain health and other supplemental, and prior to its sale in 2018, long-term care policies sold to individuals for which some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years.At policy issuance, these reserves are recognized on a net level premium method based on interest rates, mortality, morbidity, and maintenance expense assumptions. Interest rates are based on our expected net investment returns on the investment portfolio supporting the reserves for these blocks of business. Mortality, a measure of expected death, and morbidity, a measure of health status, assumptions are based on industry actuarial tables, modified based upon actual experience. Changes in estimates of these reserves are recognized as an adjustment to benefits expense in the period the changes occur. We perform loss recognition tests at least annually in the fourth quarter, and more frequently if adverse events or changes in circumstances indicate that the level of the liability, together with the present value of future gross premiums, may not be adequate to provide for future expected policy benefits and maintenance costs. During 2016, we recorded a loss for a premium deficiency as discussed further in Note 18.

We adjust future policy benefits payable for the additional liability that would have been recorded if investment securities backing the liability had been sold at their stated aggregate fair value and the proceeds reinvested at current yields. We include the impact of this adjustment, if any, net of applicable deferred taxes, with the change in unrealized investment gain (loss) in accumulated other comprehensive income in stockholders’ equity. Health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model under which policy reserves are not established because premiums received in the current year are intended to pay anticipated benefits in that year. In addition, as previously underwritten members transition to plans compliant with the Health Care Reform Law, it results in policy lapses and the release of reserves for future policy benefits.

Book Overdraft

Book Overdraft

Under our cash management system, checks issued but not yet presented to banks that would result in negative bank balances when presented are classified as a current liability in the consolidated balance sheets. Changes in book overdrafts from period to period are reported in the consolidated statement of cash flows as a financing activity.

Income Taxes

Income Taxes

We recognize an asset or liability for the deferred tax consequences of temporary differences between the tax bases of assets or liabilities and their reported amounts in the consolidated financial statements. These temporary differences will result in taxable or deductible amounts in future years when the reported amounts of the assets or liabilities are recovered or settled. We also recognize the future tax benefits such as net operating and capital loss carryforwards as deferred tax assets. A valuation allowance is provided against these deferred tax assets if it is more likely than not that some portion or all of the deferred tax assets will not be realized. Future years’ tax expense may be increased or decreased by adjustments to the valuation allowance or to the estimated accrual for income taxes. Deferred tax assets and deferred tax liabilities are further adjusted for changes in the enacted tax rates.

We record tax benefits when it is more likely than not that the tax return position taken with respect to a particular transaction will be sustained. A liability, if recorded, is not considered resolved until the statute of limitations for the relevant taxing authority to examine and challenge the tax position has expired, or the tax position is ultimately settled through examination, negotiation, or litigation. We classify interest and penalties associated with uncertain tax positions in our provision for income taxes.

Stock-Based Compensation

Stock-Based Compensation

We generally recognize stock-based compensation expense, as determined on the date of grant at fair value, on a straight-line basis over the period during which an employee is required to provide service in exchange for the award (the vesting period). In addition, for awards with both time and performance-based conditions, we generally recognize compensation expense on a straight line basis over the vesting period when it is probable that the performance condition will be achieved. We estimate expected forfeitures and recognize compensation expense only for those awards which are expected to vest. We estimate the grant-date fair value of stock options using the Black-Scholes option-pricing model.

Earnings Per Common Share

Earnings Per Common Share

We compute basic earnings per common share on the basis of the weighted-average number of unrestricted common shares outstanding. Diluted earnings per common share is computed on the basis of the weighted-average number of unrestricted common shares outstanding plus the dilutive effect of outstanding employee stock options and restricted shares, or units, using the treasury stock method.

Fair Value

Fair Value

Assets and liabilities measured at fair value are categorized into a fair value hierarchy based on whether the inputs to valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own assumptions about the assumptions market participants would use. The fair value hierarchy includes three levels of inputs that may be used to measure fair value as described below.

Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt securities that are traded in an active exchange market.

Level 2 – Observable inputs other than Level 1 prices such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments as well as debt securities whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data.

Level 3 – Unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. Level 3 includes assets and liabilities whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques reflecting our own assumptions about the assumptions market participants would use as well as those requiring significant management judgment.

Fair value of actively traded debt securities are based on quoted market prices. Fair value of other debt securities are based on quoted market prices of identical or similar securities or based on observable inputs like interest rates generally using a market valuation approach, or, less frequently, an income valuation approach and are generally classified as Level 2. We obtain at least one price for each security from a third party pricing service. These prices are generally derived from recently reported trades for identical or similar securities, including adjustments through the reporting date based upon observable market information. When quoted prices are not available, the third party pricing service may use quoted market prices of comparable securities or discounted cash flow analysis, incorporating inputs that are currently observable in the markets for similar securities. Inputs that are often used in the valuation methodologies include benchmark yields, reported trades, credit spreads, broker quotes, default rates, and prepayment speeds. We are responsible for the determination of fair value and as such we perform analysis on the prices received from the third party pricing service to determine whether the prices are reasonable estimates of fair value. Our analysis includes a review of monthly price fluctuations as well as a quarterly comparison of the prices received from the pricing service to prices reported by our third party investment adviser. In addition, on a quarterly basis we examine the underlying inputs and assumptions for a sample of individual securities across asset classes, credit rating levels, and various durations.

Fair value of privately held debt securities are estimated using a variety of valuation methodologies, including both market and income approaches, where an observable quoted market does not exist and are generally classified as Level 3. For privately-held debt securities, such methodologies include reviewing the value ascribed to the most recent financing, comparing the security with securities of publicly-traded companies in similar lines of business, and reviewing the underlying financial performance including estimating discounted cash flows.

Recently Issued Accounting Pronouncements

Recently Issued Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board, or FASB, issued new guidance that amends the accounting for revenue recognition. The amendments are intended to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices, and improve disclosure requirements. Insurance contracts are not included in the scope of this new guidance. Accordingly, our premiums revenue and investment income, collectively representing approximately 97% of our consolidated external revenues for the year ended December 31, 2018, are not included in the scope of the new guidance. We adopted the new standard effective January 1, 2018, using the modified retrospective approach. As the majority of our revenues are not subject to the new guidance and the remaining revenues’ accounting treatment did not materially differ from pre-existing accounting treatment, the adoption of the new standard did not have a material impact on our consolidated results of operations, financial condition, cash flows, or related disclosures.

Accounting Pronouncements Effective in Future Periods

In February 2016, the FASB issued new guidance related to accounting for leases which requires lessees to record assets and liabilities reflecting the leased assets and lease obligations, respectively, while following the dual model for recognition in statements of income requiring leases to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) while finance leases will result in a front-loaded expense pattern (similar to current capital leases). We adopted the new standard effective January 1, 2019, as allowed, using the modified retrospective approach. We elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allows us to carryforward the historical lease classification without restating comparative prior periods. We made a permitted accounting policy election to not apply the new guidance to leases with an initial term of 12 months or less. We will recognize those lease payments in the Consolidated Statements of Operations on a straight-line basis over the lease term. The adoption of the standard resulted in recognition of additional lease assets and lease liabilities of approximately $470 million as of January 1, 2019. We believe the standard will not materially affect our consolidated net earnings, cash flows and liquidity.

In June 2016, the FASB issued guidance introducing a new model for recognizing credit losses on financial instruments based on an estimate of current expected credit losses. The guidance is effective for us beginning January 1, 2020. The new current expected credit losses (CECL) model generally calls for the immediate recognition of all expected credit losses and applies to loans, accounts and trade receivables as well as other financial assets measured at amortized cost, loan commitments and off-balance sheet credit exposures, debt securities and other financial assets measured at fair value through other comprehensive income, and beneficial interests in securitized financial assets. The new guidance replaces the current incurred loss model for measuring expected credit losses, requires expected losses on available for sale debt securities to be recognized through an allowance for credit losses rather than as reductions in the amortized cost of the securities, and provides for additional disclosure requirements. Our investment portfolio consists of available for sale debt securities. We are currently evaluating the impact on our results of operations, financial condition, and cash flows.

In March 2017, the FASB issued new guidance that amends the accounting for premium amortization on purchased callable debt securities by shortening the amortization period. This amended guidance requires the premium to be amortized to the earliest call date instead of maturity date. The new guidance is effective for us beginning with annual and interim periods in 2019. This guidance will not have a material impact on our results of operations, financial condition or cash flows.

In February 2018, the FASB issued guidance which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the December 22, 2017 enactment of the Tax Cuts and Jobs Act.  The new guidance is effective for us beginning January 1, 2019, with early adoption permitted.  We early adopted this guidance in the first quarter of 2018 and it did not have a material impact on our results of operations, financial condition or cash flows.

In September 2018, the FASB issued new guidance related to accounting for long-duration contracts of insurers which revises key elements of the measurement models and disclosure requirements for long-duration contracts issued by insurers and reinsurers. The new guidance is effective for us beginning with annual and interim periods in 2021, with earlier adoption permitted, and requires retrospective application to previously issued annual and interim financial statements. We are currently evaluating the impact on our results of operations, financial position and cash flows.

There are no other recently issued accounting standards that apply to us or that are expected to have a material impact on our results of operations, financial condition, or cash flows.

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ACQUISITIONS AND DIVESTITURES ACQUISITIONS AND DIVESTITURES (Tables)

12 Months Ended

Dec. 31, 2018

Business Combinations [Abstract]

Disposal Groups, Including Discontinued Operations

The assets and liabilities of KMG that were disposed of on August 9, 2018 were as follows:

	August 9, 2018
Assets	(in millions)
Cash and cash equivalents	$	805
Receivables, net	3
Investment securities	1,576
Other assets	1,085
Total assets disposed	$	3,469
Liabilities
Benefits payable	$	58
Trade accounts payable and accrued expenses	70
Future policy benefits payable	2,573
Total liabilities disposed	$	2,701

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EQUITY METHOD INVESTMENT (Tables)

12 Months Ended

Dec. 31, 2018

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments

The summarized balance sheet at December 31, 2018 and income statement for the period beginning July 2, 2018 through December 31, 2018 of Kindred at Home in which we hold a 40% equity interest was as follows:

Balance sheet	December 31, 2018
	(in millions)
Current assets	$	536
Non-current assets	4,955
Current liabilities	351
Non-current liabilities	2,708
Shareholders' equity	2,432
Statement of income
	July 2, 2018 through December 31, 2018
	(in millions)
Revenues	$	1,587
Expenses	1,451
Net income	27

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INVESTMENT SECURITIES (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Investment Securities Classified as Current and Long-Term

Investment securities classified as current and long-term were as follows at December 31, 2018 and 2017, respectively:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
December 31, 2018
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	419	$	1	$	(3	)	$	417
Mortgage-backed securities	2,595		3		(54		)	2,544
Tax-exempt municipal securities	2,805		3		(37		)	2,771
Mortgage-backed securities:
Residential	55		—		—			55
Commercial	537		—		(14		)	523
Asset-backed securities	991		1		(7		)	985
Corporate debt securities	3,239		1		(98		)	3,142
Total debt securities	$	10,641	$	9	$	(213	)	$	10,437
December 31, 2017
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	532	$	1	$	(2	)	$	531
Mortgage-backed securities	1,625		4		(19		)	1,610
Tax-exempt municipal securities	3,884		33		(28		)	3,889
Mortgage-backed securities:
Residential	26		—		—			26
Commercial	455		3		(2		)	456
Asset-backed securities	407		1		—			408
Corporate debt securities	5,175		244		(37		)	5,382
Total debt securities	$	12,104	$	286	$	(88	)	$	12,302

Schedule of Gross Unrealized Losses and Fair Value of Securities

Gross unrealized losses and fair values aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows at December 31, 2018 and 2017, respectively:

	Less than 12 months					12 months or more					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in millions)
December 31, 2018
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	179	$	(1	)	$	153	$	(2	)	$	332	$	(3	)
Mortgage-backed securities	956		(16		)	1,019		(38		)	1,975		(54		)
Tax-exempt municipal securities	809		(9		)	1,648		(28		)	2,457		(37		)
Mortgage-backed securities:
Residential	—		—			15		—			15		—
Commercial	372		(8		)	133		(6		)	505		(14		)
Asset-backed securities	824		(7		)	40		—			864		(7		)
Corporate debt securities	1,434		(35		)	1,439		(63		)	2,873		(98		)
Total debt securities	$	4,574	$	(76	)	$	4,447	$	(137	)	$	9,021	$	(213	)
December 31, 2017
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	273	$	(1	)	$	130	$	(1	)	$	403	$	(2	)
Mortgage-backed securities	581		(2		)	672		(17		)	1,253		(19		)
Tax-exempt municipal securities	1,590		(16		)	661		(12		)	2,251		(28		)
Mortgage-backed securities:
Residential	20		—			3		—			23		—
Commercial	131		(1		)	28		(1		)	159		(2		)
Asset-backed securities	107		—			10		—			117		—
Corporate debt securities	1,297		(10		)	804		(27		)	2,101		(37		)
Total debt securities	$	3,999	$	(30	)	$	2,308	$	(58	)	$	6,307	$	(88	)

Schedule of Realized Gains (Losses) Related to Investment Securities Included Within Investment Income

The detail of realized gains (losses) related to investment securities and included within investment income was as follows for the years ended December 31, 2018, 2017, and 2016:

	2018			2017			2016
	(in millions)
Gross realized gains	$	106		$	35		$	120
Gross realized losses	(16		)	(21		)	(24		)
Net realized capital gains	$	90		$	14		$	96

Schedule of Contractual Maturity of Debt Securities Available for Sale

The contractual maturities of debt securities available for sale at December 31, 2018, regardless of their balance sheet classification, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
	(in millions)
Due within one year	$	943	$	941
Due after one year through five years	2,929		2,873
Due after five years through ten years	1,873		1,810
Due after ten years	718		706
Mortgage and asset-backed securities	4,178		4,107
Total debt securities	$	10,641	$	10,437

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FAIR VALUE (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Financial Assets Measured at Fair Value on Recurring Basis

The following table summarizes our fair value measurements at December 31, 2018 and 2017, respectively, for financial assets measured at fair value on a recurring basis:

			Fair Value Measurements Using
	Fair Value		Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
	(in millions)
December 31, 2018
Cash equivalents	$	2,024	$	2,024	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	417		—		417		—
Mortgage-backed securities	2,544		—		2,544		—
Tax-exempt municipal securities	2,771		—		2,771		—
Mortgage-backed securities:
Residential	55		—		55		—
Commercial	523		—		523		—
Asset-backed securities	985		—		985		—
Corporate debt securities	3,142		—		3,142		—
Total debt securities	10,437		—		10,437		—
Total invested assets	$	12,461	$	2,024	$	10,437	$	—
December 31, 2017
Cash equivalents	$	4,564	$	4,564	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	531		—		531		—
Mortgage-backed securities	1,610		—		1,610		—
Tax-exempt municipal securities	3,889		—		3,889		—
Mortgage-backed securities:
Residential	26		—		26		—
Commercial	456		—		456		—
Asset-backed securities	408		—		408		—
Corporate debt securities	5,382		—		5,381		1
Total debt securities	12,302		—		12,301		1
Total invested assets	$	16,866	$	4,564	$	12,301	$	1

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MEDICARE PART D (Tables)

12 Months Ended

Dec. 31, 2018

Insurance [Abstract]

Balance Sheet Amounts Associated With Medicare Part D

The accompanying consolidated balance sheets include the following amounts associated with Medicare Part D as of December 31, 2018 and 2017. CMS subsidies/discounts in the table below include the reinsurance and low-income cost subsidies funded by CMS for which we assume no risk as well as brand name prescription drug discounts for Part D plan participants in the coverage gap funded by CMS and pharmaceutical manufacturers.

	2018						2017
	Risk Corridor Settlement			CMS Subsidies/ Discounts			Risk Corridor Settlement			CMS Subsidies/ Discounts
	(in millions)
Other current assets	$	15		$	172		$	4		$	101
Trade accounts payable and accrued expenses	(103		)	(503		)	(255		)	(1,085		)
Net current liability	(88		)	(331		)	(251		)	$	(984	)
Other long-term assets	7			—			—			—
Other long-term liabilities	(89		)	—			(28		)	—
Net long-term liability	(82		)	—			(28		)	—
Total net liability	$	(170	)	$	(331	)	$	(279	)	$	(984	)

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PROPERTY AND EQUIPMENT, NET (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT, NET

Property and equipment was comprised of the following at December 31, 2018 and 2017.

	2018			2017
	(in millions)
Land	$	20		$	20
Buildings and leasehold improvements	766			713
Equipment	890			824
Computer software	2,372			2,003
	4,048			3,560
Accumulated depreciation	(2,313		)	(1,976		)
Property and equipment, net	$	1,735		$	1,584

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill By Reportable Segments

Changes in the carrying amount of goodwill for our reportable segments for the years ended December 31, 2018 and 2017 were as follows:

	Retail		Group and Specialty		Healthcare Services		Total
	(in millions)
Balance at January 1, 2017	$	1,059	$	261	$	1,952	$	3,272
Acquisitions	—		—		9		9
Balance at December 31, 2017	1,059		261		1,961		3,281
Acquisitions	476		—		140		616
Balance at December 31, 2018	$	1,535	$	261	$	2,101	$	3,897

Details of Intangible Assets Included in Other Long-Term Assets

The following table presents details of our other intangible assets included in other long-term assets in the accompanying consolidated balance sheets at December 31, 2018 and 2017.

	Weighted Average Life	2018						2017
		Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
		(in millions)
Other intangible assets:
Customer contracts/relationships	8.7 years	$	646	$	434	$	212	$	566	$	401	$	165
Trade names and technology	6.4 years	84		83		1		104		84		20
Provider contracts	11.8 years	68		37		31		68		30		38
Noncompetes and other	7.3 years	29		28		1		32		29		3
Total other intangible assets	8.7 years	$	827	$	582	$	245	$	770	$	544	$	226

Schedule of Estimated Amortization Expense

The following table presents our estimate of amortization expense for each of the five next succeeding fiscal years:

	(in millions)
For the years ending December 31,
2019	$	70
2020	67
2021	34
2022	31
2023	18

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BENEFITS PAYABLE (Tables)

12 Months Ended

Dec. 31, 2018

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Activity in Benefits Payable

On a consolidated basis, activity in benefits payable, excluding military services, was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	4,668		$	4,563		$	4,976
Less: Premium deficiency reserve	—			—			(176		)
Less: Reinsurance recoverables	(70		)	(76		)	(85		)
Balances at January 1, net	4,598			4,487			4,715
Incurred related to:
Current year	46,385			44,001			45,318
Prior years	(503		)	(483		)	(582		)
Total incurred	45,882			43,518			44,736
Paid related to:
Current year	(41,736		)	(39,496		)	(40,852		)
Prior years	(3,977		)	(3,911		)	(4,112		)
Total paid	(45,713		)	(43,407		)	(44,964		)
Reinsurance recoverable	95			70			76
Balances at December 31	$	4,862		$	4,668		$	4,563

Schedule Of Favorable Medical Claims Reserve Development Related To Prior Fiscal Years By Segment

The table below details our favorable medical claims reserve development related to prior fiscal years by segment for 2018, 2017, and 2016.

	Favorable Medical Claims Reserve Development
	2018			2017			2016
Retail Segment	$	(398	)	$	(386	)	$	(429	)
Group and Specialty Segment	(46		)	(40		)	(46		)
Individual Commercial Segment	(57		)	(56		)	(106		)
Other Businesses	(2		)	(1		)	(1		)
Total	$	(503	)	$	(483	)	$	(582	)

Benefit Expenses Excluded From Activity in Benefits Payable

Benefits expense excluded from the previous table was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018		2017			2016
	(in millions)
Premium deficiency reserve for short-duration policies	$	—	$	—		$	(176	)
Military services	—		—			8
Future policy benefits	—		(22		)	439
Total	$	—	$	(22	)	$	271

Schedule Of Benefits Expense

Activity in benefits payable for our Group and Specialty segment, excluding military services, was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	568		$	579		$	616
Less: Reinsurance recoverables	—			—			—
Balances at January 1, net	568			579			616
Incurred related to:
Current year	5,466			5,403			5,271
Prior years	(46		)	(40		)	(46		)
Total incurred	5,420			5,363			5,225
Paid related to:
Current year	(4,957		)	(4,843		)	(4,700		)
Prior years	(514		)	(531		)	(562		)
Total paid	(5,471		)	(5,374		)	(5,262		)
Balances at December 31	$	517		$	568		$	579

Activity in benefits payable for ourIndividual Commercial segment, was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	101		$	454		$	741
Less: Premium deficiency reserve	—			—			(176		)
Balances at January 1, net	101			454			565
Incurred related to:
Current year	—			669			3,677
Prior years	(56		)	(56		)	(106		)
Total incurred	(56		)	613			3,571
Paid related to:
Current year	—			(583		)	(3,233		)
Prior years	(38		)	(383		)	(449		)
Total paid	(38		)	(966		)	(3,682		)
Balances at December 31	$	7		$	101		$	454

Activity in benefits payable for our Retail segment was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Balances at January 1	$	3,963		$	3,506		$	3,600
Less: Reinsurance recoverables	(70		)	(76		)	(85		)
Balances at January 1, net	3,893			3,430			3,515
Incurred related to:
Current year	41,323			38,604			37,212
Prior years	(398		)	(386		)	(429		)
Total incurred	40,925			38,218			36,783
Paid related to:
Current year	(37,189		)	(34,781		)	(33,784		)
Prior years	(3,386		)	(2,974		)	(3,084		)
Total paid	(40,575		)	(37,755		)	(36,868		)
Reinsurance recoverable	95			70			76
Balances at December 31	$	4,338		$	3,963		$	3,506

The reconciliation of the net incurred and paid claims development tables to benefits payable in the consolidated statement of financial position is as follows:    

	December 31, 2018
Net outstanding liabilities
Retail	$	4,243
Group and Specialty	517
Individual Commercial	7
Benefits payable, net of reinsurance	4,767
Reinsurance recoverable on unpaid claims
Retail	95
Total benefits payable, gross	$	4,862

The following tables provide information about incurred and paid claims development for the Individual Commercial segment as of December 31, 2018, net of reinsurance.

	Incurred Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	3,677	$	3,621	$	3,609
2017			669		627
2018					—
Total					$	4,236

	Cumulative Paid Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	3,233	$	3,606	$	3,609
2017			583		620
2018					—
Total					$	4,229
All outstanding benefit liabilities before 2015, net of reinsurance					N/A
Benefits payable, net of reinsurance					$	7

The following tables provide information about incurred and paid claims development for the Group and Specialty segment as of December 31, 2018, net of reinsurance.

	Incurred Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	5,271	$	5,234	$	5,235
2017			5,403		5,358
2018					5,466
Total					$	16,059

	Cumulative Paid Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	4,700	$	5,226	$	5,234
2017			4,843		5,351
2018					4,957
Total					$	15,542
All outstanding benefit liabilities before 2015, net of reinsurance					N/A
Benefits payable, net of reinsurance					$	517

The following tables provide information about incurred and paid claims development for the Retail segment as of December 31, 2018, net of reinsurance.

	Incurred Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	37,212	$	36,891	$	36,811
2017			38,604		38,341
2018					41,323
Total					$	116,475

	Cumulative Paid Claims, Net of Reinsurance
	For the Years Ended December 31,
Claims Incurred Year	2016 Unaudited		2017 Unaudited		2018
	(in millions)
2016	$	33,784	$	36,841	$	36,811
2017			34,781		38,232
2018					37,189
Total					$	112,232
All outstanding benefit liabilities before 2015, net of reinsurance					N/A
Benefits payable, net of reinsurance					$	4,243

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INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Provision for Income Taxes

The provision for income taxes consisted of the following for the years ended December 31, 2018, 2017 and 2016:

	2018		2017		2016
	(in millions)
Current provision:
Federal	$	139	$	1,324	$	921
States and Puerto Rico	58		116		88
Total current provision	197		1,440		1,009
Deferred expense (benefit)	194		132		(71		)
Provision for income taxes	$	391	$	1,572	$	938

Provision for Income Taxes Using Federal Statutory Rate

The provision for income taxes was different from the amount computed using the federal statutory rate for the years ended December 31, 2018, 2017 and 2016 due to the following:

	2018			2017			2016
	(in millions)
Income tax provision at federal statutory rate	$	436		$	1,407		$	543
States, net of federal benefit, and Puerto Rico	42			80			41
Tax exempt investment income	(11		)	(22		)	(20		)
Health insurance industry fee	243			—			336
Nondeductible executive compensation	17			36			30
Tax reform	(39		)	133			—
KMG sale	(272		)	—			—
Other, net	(25		)	(62		)	8
Provision for income taxes	$	391		$	1,572		$	938

Principal Components of Net Deferred Tax Balances

Principal components of our net deferred tax balances at December 31, 2018 and 2017 were as follows:

	Assets (Liabilities)
	2018			2017
	(in millions)
Compensation and other accrued expense	$	89		$	138
Benefits payable	79			113
Investment securities	44			—
Net operating loss carryforward	38			53
Capital loss carryforward	15			—
Deferred acquisition costs	17			48
Unearned revenues	9			12
Other	8			1
Future policy benefits payable	—			231
Total deferred income tax assets	299			596
Valuation allowance	(54		)	(49		)
Total deferred income tax assets, net of valuation allowance	245			547
Depreciable property and intangible assets	(273		)	(237		)
Prepaid expenses	(52		)	(44		)
Future policy benefits payable	(5		)	—
Investment securities	—			(49		)
Total deferred income tax liabilities	(330		)	(330		)
Total net deferred income tax assets/(liabilities)	$	(85	)	$	217

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DEBT (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Carrying Value of Long-Term Debt Outstanding

The carrying value of debt outstanding was as follows at December 31, 2018 and 2017:

	2018		2017
	(in millions)
Short-term debt:
Commercial paper	$	645	150
Term note	650		—
Senior note:
$400 million, 2.625% due October 1, 2019	399		—
Total short-term debt	$	1,694	$	150
Long-term debt:
Senior notes:
$400 million, 2.625% due October 1, 2019	$	—	$	399
$400 million, 2.50% due December 15, 2020	398		397
$400 million, 2.90% due December 15, 2022	396		396
$600 million, 3.15% due December 1, 2022	596		595
$600 million, 3.85% due October 1, 2024	597		595
$600 million, 3.95% due March 15, 2027	594		594
$250 million, 8.15% due June 15, 2038	263		263
$400 million, 4.625% due December 1, 2042	396		396
$750 million, 4.95% due October 1, 2044	739		739
$400 million, 4.80% due March 15, 2047	396		396
Total long-term debt	$	4,375	$	4,770

Schedule of Maturities of Long-term Debt

Maturities of the short-term and long-term debt for the years ending December 31, are as follows:

For the years ending December 31,	(in millions)
2019	$	1,697
2020	400
2021	—
2022	1,000
2023	—
Thereafter	3,000

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EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Stock-Based Compensation Expense

The compensation expense that has been charged against income for these plans was as follows for the years ended December 31,2018, 2017, and 2016:

	2018			2017			2016
	(in millions)
Stock-based compensation expense by type:
Restricted stock	$	124		$	145		$	106
Stock options	13			12			9
Total stock-based compensation expense	137			157			115
Tax benefit recognized	(21		)	(32		)	(20		)
Stock-based compensation expense, net of tax	$	116		$	125		$	95

Activity for Restricted Stock Awards

Activity for our restricted stock was as follows for the year ended December 31, 2018:

	Shares		Weighted- Average Grant-Date Fair Value
	(shares in thousands)
Nonvested restricted stock at December 31, 2017	1,653		$	171.68
Granted	576		276.62
Vested	(1,045	)	185.82
Forfeited	(220	)	180.83
Nonvested restricted stock at December 31, 2018	964		$	213.99

Weighted-Average Fair Value of Stock Options

The fair value was estimated on the date of grant using the Black-Scholes pricing model with the weighted-average assumptions indicated below:

	2018			2017			2016
Weighted-average fair value at grant date	$	63.67		$	49.81		$	37.12
Expected option life (years)	4.1 years			4.1 years			4.2 years
Expected volatility	26.1		%	27.1		%	27.6		%
Risk-free interest rate at grant date	2.5		%	2.0		%	1.1		%
Dividend yield	0.7		%	0.7		%	0.7		%

Activity for Option Plans

Activity for our option plans was as follows for the year ended December 31, 2018:

	Shares  Under Option		Weighted-Average Exercise Price
	(shares in thousands)
Options outstanding at December 31, 2017	863		$	181.44
Granted	143		276.01
Exercised	(320	)	157.44
Forfeited	(9	)	150.59
Options outstanding at December 31, 2018	677		$	213.17
Options exercisable at December 31, 2018	178		$	180.76

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EARNINGS PER COMMON SHARE COMPUTATION (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Details Supporting Computation of Earnings Per Share

Detail supporting the computation of basic and diluted earnings per common share was as follows for the years ended December 31, 2018, 2017 and 2016:

	2018		2017		2016
	(dollars in millions, except per common share results, number of shares/options in thousands)
Net income available for common stockholders	$	1,683	$	2,448	$	614
Weighted-average outstanding shares of common stock used to compute basic earnings per common share	137,486		144,493		149,375
Dilutive effect of:
Employee stock options	194		172		219
Restricted stock	723		920		1,323
Shares used to compute diluted earnings per common share	138,403		145,585		150,917
Basic earnings per common share	$	12.24	$	16.94	$	4.11
Diluted earnings per common share	$	12.16	$	16.81	$	4.07
Number of antidilutive stock options and restricted stock awards excluded from computation	223		539		748

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STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of Details of Dividend Payments

The following table provides details of dividend payments, excluding dividend equivalent rights, in 2016, 2017, and 2018 under our Board approved quarterly cash dividend policy:

Payment Date	Amount per Share	Total Amount
		(in millions)
2016	$1.16	$172
2017	$1.49	$216
2018	$1.90	$262

Class of Treasury Stock

ASR.

Excluding shares acquired in connection with employee stock plans, share repurchases were as follows during the years ended December 31, 2018, 2017 and 2016.

		2018			2017			2016
Authorization Date	Purchase Not to Exceed	Shares	Cost		Shares	Cost		Shares	Cost
	(in millions)
February 2017	2,250	—	—		9.71	2,250		—	—
December 2017	3,000	3.07	1,024		3.28	800		—	—
Total repurchases		3.07	$	1,024	12.99	$	3,050	—	$	—

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COMMITMENTS, GUARANTEES AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Rent Expense and Sublease Rental Income Associated With Operating Leases

Rent expense and sublease rental income, which are recorded net as an operating cost, for all operating leases were as follows for the years ended December 31, 2018, 2017 and 2016:

	2018			2017			2016
	(in millions)
Rent expense	$	167		$	204		$	179
Sublease rental income	(32		)	(33		)	(26		)
Net rent expense	$	135		$	171		$	153

Future Annual Minimum Payments Due

Future annual minimum payments due subsequent to December 31, 2018 under all of our noncancelable operating leases with initial terms in excess of one year are as follows:

	Minimum Lease Payments		Sublease Rental Receipts			Net  Lease Commitments
	(in millions)
For the years ending December 31,:
2019	$	147	$	(13	)	$	134
2020	113		(12		)	101
2021	96		(10		)	86
2022	79		(9		)	70
2023	34		(9		)	25
Thereafter	50		(23		)	27
Total	$	519	$	(76	)	$	443

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SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, By Segment

	Retail		Group and Specialty		Healthcare Services		Individual Commercial			Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
2018
External revenues
Premiums:
Individual Medicare Advantage	$	35,656	$	—	$	—	$	—		$	—	$	—		$	35,656
Group Medicare Advantage	6,103		—		—		—			—		—			6,103
Medicare stand-alone PDP	3,584		—		—		—			—		—			3,584
Total Medicare	45,343		—		—		—			—		—			45,343
Fully-insured	510		5,444		—		8			—		—			5,962
Specialty	—		1,359		—		—			—		—			1,359
Medicaid and other	2,255		—		—		—			22		—			2,277
Total premiums	48,108		6,803		—		8			22		—			54,941
Services revenue:
Provider	—		—		404		—			—		—			404
ASO and other	11		835		—		—			4		—			850
Pharmacy	—		—		203		—			—		—			203
Total services revenue	11		835		607		—			4		—			1,457
Total external revenues	48,119		7,638		607		8			26		—			56,398
Intersegment revenues
Services	—		18		16,840		—			—		(16,858		)	—
Products	—		—		6,330		—			—		(6,330		)	—
Total intersegment revenues	—		18		23,170		—			—		(23,188		)	—
Investment income	136		23		34		—			110		211			514
Total revenues	48,255		7,679		23,811		8			136		(22,977		)	56,912
Operating expenses:
Benefits	40,925		5,420		—		(70		)	77		(470		)	45,882
Operating costs	5,327		1,810		22,905		4			6		(22,527		)	7,525
Depreciation and amortization	270		88		163		—			—		(116		)	405
Total operating expenses	46,522		7,318		23,068		(66		)	83		(23,113		)	53,812
Income from operations	1,733		361		743		74			53		136			3,100
Loss on sale of business	—		—		—		—			—		786			786
Interest expense	—		—		—		—			—		218			218
Other expense, net	—		—		—		—			—		33			33
Income (loss) before income taxes and equity in earnings	1,733		361		743		74			53		(901		)	2,063
Equity in net earnings of Kindred at Home	—		—		11		—			—		—			11
Segment earnings (losses)	$	1,733	$	361	$	754	$	74		$	53	$	(901	)	$	2,074

Premium and services revenues derived from our contracts with the federal government, as a percentage of our total premium and services revenues, was approximately 81% for 2018, compared to 79% for 2017, and 75% for 2016.

	Retail		Group and Specialty		Healthcare Services		Individual Commercial		Other Businesses			Eliminations/ Corporate			Consolidated
	(in millions)
2017
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	32,720	$	—	$	—	$	—	$	—		$	—		$	32,720
Group Medicare Advantage	5,155		—		—		—		—			—			5,155
Medicare stand-alone PDP	3,702		—		—		—		—			—			3,702
Total Medicare	41,577		—		—		—		—			—			41,577
Fully-insured	478		5,462		—		947		—			—			6,887
Specialty	—		1,310		—		—		—			—			1,310
Medicaid and other	2,571		—		—		—		35			—			2,606
Total premiums	44,626		6,772		—		947		35			—			52,380
Services revenue:
Provider	—		—		258		—		—			—			258
ASO and other	10		626		—		—		8			—			644
Pharmacy	—		—		80		—		—			—			80
Total services revenue	10		626		338		—		8			—			982
Total revenues—external customers	44,636		7,398		338		947		43			—			53,362
Intersegment revenues
Services	—		20		17,293		—		—			(17,313		)	—
Products	—		—		6,292		—		—			(6,292		)	—
Total intersegment revenues	—		20		23,585		—		—			(23,605		)	—
Investment income	90		31		35		4		87			158			405
Total revenues	44,726		7,449		23,958		951		130			(23,447		)	53,767
Operating expenses:
Benefits	38,218		5,363		—		544		131			(760		)	43,496
Operating costs	4,292		1,590		22,848		201		12			(22,376		)	6,567
Merger termination fee and related costs, net	—		—		—		—		—			(936		)	(936		)
Depreciation and amortization	238		84		143		13		—			(100		)	378
Total operating expenses	42,748		7,037		22,991		758		143			(24,172		)	49,505
Income (loss) from operations	1,978		412		967		193		(13		)	725			4,262
Interest expense	—		—		—		—		—			242			242
Income (loss) before income taxes and equity in earnings	1,978		412		967		193		(13		)	483			4,020
Equity in net earnings of Kindred at Home	—		—		—		—		—			—			—
Segment earnings (losses)	$	1,978	$	412	$	967	$	193	$	(13	)	$	483		$	4,020

	Retail		Group and Specialty		Healthcare Services		Individual Commercial			Other Businesses			Eliminations/ Corporate			Consolidated
	(in millions)
2016
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	31,863	$	—	$	—	$	—		$	—		$	—		$	31,863
Group Medicare Advantage	4,283		—		—		—			—			—			4,283
Medicare stand-alone PDP	4,009		—		—		—			—			—			4,009
Total Medicare	40,155		—		—		—			—			—			40,155
Fully-insured	428		5,405		—		3,064			—			—			8,897
Specialty	—		1,279		—		—			—			—			1,279
Medicaid and other	2,640		12		—		—			38			—			2,690
Total premiums	43,223		6,696		—		3,064			38			—			53,021
Services revenue:
Provider	—		—		278		—			—			—			278
ASO and other	6		643		1		—			10			—			660
Pharmacy	—		—		31		—			—			—			31
Total services revenue	6		643		310		—			10			—			969
Total revenues—external customers	43,229		7,339		310		3,064			48			—			53,990
Intersegment revenues
Services	—		22		18,979		—			—			(19,001		)	—
Products	—		—		5,993		—			—			(5,993		)	—
Total intersegment revenues	—		22		24,972		—			—			(24,994		)	—
Investment income	90		25		30		5			66			173			389
Total revenues	43,319		7,386		25,312		3,069			114			(24,821		)	54,379
Operating expenses:
Benefits	36,783		5,233		—		3,301			617			(927		)	45,007
Operating costs	4,650		1,727		24,073		601			16			(23,894		)	7,173
Merger termination fee and related costs, net	—		—		—		—			—			104			104
Depreciation and amortization	196		82		143		36			1			(104		)	354
Total operating expenses	41,629		7,042		24,216		3,938			634			(24,821		)	52,638
Income (loss) from operations	1,690		344		1,096		(869		)	(520		)	—			1,741
Gain on sale of business	—		—		—		—			—			—			—
Interest expense	—		—		—		—			—			189			189
Income (loss) before income taxes and equity in earnings	1,690		344		1,096		(869		)	(520		)	(189		)	1,552
Equity in net earnings of Kindred at Home	—		—		—		—			—			—			—
Segment earnings (losses)	$	1,690	$	344	$	1,096	$	(869	)	$	(520	)	$	(189	)	$	1,552

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EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS (Tables)

12 Months Ended

Dec. 31, 2018

Insurance [Abstract]

Schedule of Deferred Acquisition Cost and Future Policy Benefits Payable With Our Long-Duration Insurance Products

The table below presents deferred acquisition costs and future policy benefits payable associated with our long-duration insurance products for the years ended December 31, 2018 and 2017.

	2018					2017
	Deferred acquisition costs		Future policy benefits payable			Deferred acquisition costs		Future policy benefits payable
	(in millions)
Other long-term assets	$	36	$	—		$	103	$	—
Trade accounts payable and accrued expenses	—		—			—		(56		)
Long-term liabilities	—		(219		)	—		(2,923		)
Total asset (liability)	$	36	$	(219	)	$	103	$	(2,979	)

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QUARTERLY FINANCIAL INFORMATION (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

A summary of our quarterly unaudited results of operations for the years ended December 31, 2018 and 2017 follows:

	2018
	First		Second		Third		Fourth
	(in millions, except per share results)
Total revenues	$	14,279	$	14,259	$	14,206	$	14,168
Income before income taxes and equity in net earnings	707		19		901		436
Net income	491		193		644		355
Basic earnings per common share	$	3.56	$	1.40	$	4.68	$	2.60
Diluted earnings per common share (1)	$	3.53	$	1.39	$	4.65	$	2.58
	2017
	First		Second		Third		Fourth
	(in millions, except per share results)
Total revenues	$	13,762	$	13,534	$	13,282	$	13,189
Income before income taxes	1,689		1,042		799		490
Net income	1,115		650		499		184
Basic earnings per common share (1)	$	7.54	$	4.49	$	3.46	$	1.30
Diluted earnings per common share (1)	$	7.49	$	4.46	$	3.44	$	1.29

(1) The calculation of earnings per common share is based on the weighted average shares outstanding during each quarter and, accordingly, the sum may not equal the total for the year.

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REPORTING ENTITY (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Entity Information [Line Items]
Percentage of total premium and services revenues derived from contracts with the federal government	81.00%	79.00%	75.00%
Florida
Entity Information [Line Items]
Percentage of premiums and services revenue related to contracts with CMS for Medicare Advantage members in Florida	15.00%

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Workforce Optimization (Details) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2017 employee	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
Expected number of associates impacted | employee	3,600
Expected percentage of workforce associates impacted	7.80%
Estimated charges		$ 148
Estimated charged per diluted share (in dollars per share) | $ / shares		$ 0.64
Workforce optimization liability		$ 140	$ 12

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Details (Detail) - USD ($)		12 Months Ended
	Feb. 16, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Significant Accounting Policies [Line Items]
Transaction costs (break up fee received)		$ 0	$ (936,000,000)	$ 104,000,000
Number of days notice for employer group to cancel short-duration prepaid health services policies		30 days
Consumer discounts on brand name prescription drugs		50.00%
TRICARE Health care cost payments		$ 5,600,000,000	3,400,000,000	3,300,000,000
Bad-debt expense		36,000,000	20,000,000	39,000,000
Contract liabilities		0
Deferred costs		0
Pharmaceutical rebates		$ 1,300,000,000	1,200,000,000
Typical term (in years) of short-duration employer-group prepaid health services policies		1 year
Goodwill		$ 3,897,000,000	3,281,000,000	3,272,000,000
Premium deficiency reserve				176,000,000
Health care reform, premium deficiency reserve, change in estimate				208,000,000
Health care reform, premium deficiency reserve, current period loss				384,000,000
Tricare South Region Contract
Significant Accounting Policies [Line Items]
TRICARE Health care cost reimbursements		5,600,000,000	3,400,000,000	3,300,000,000
Difference between TRICARE health care costs payments and reimbursements		$ 38,000,000	11,000,000	25,000,000
Equipment | Minimum
Significant Accounting Policies [Line Items]
Useful life		3 years
Equipment | Maximum
Significant Accounting Policies [Line Items]
Useful life		10 years
Computer Software | Minimum
Significant Accounting Policies [Line Items]
Useful life		3 years
Computer Software | Maximum
Significant Accounting Policies [Line Items]
Useful life		5 years
Building | Minimum
Significant Accounting Policies [Line Items]
Useful life		10 years
Building | Maximum
Significant Accounting Policies [Line Items]
Useful life		20 years
Health Care Reform
Significant Accounting Policies [Line Items]
Payment of annual health insurance industry fee		$ 1,040,000,000		916,000,000
CMS Reinsurance Subsidies Or Discounts
Significant Accounting Policies [Line Items]
Subsidy and discount reimbursements		9,600,000,000	12,100,000,000	11,100,000,000
Subsidy and discount payments		10,300,000,000	10,200,000,000	10,000,000,000
Subsidy and discount payments in excess of reimbursements		$ 700,000,000	1,900,000,000	$ 1,100,000,000
Settlement period after close		9 months
CMS Brand Name Prescription Drug Discounts | Minimum
Significant Accounting Policies [Line Items]
Settlement period after close		14 months
CMS Brand Name Prescription Drug Discounts | Maximum
Significant Accounting Policies [Line Items]
Settlement period after close		18 months
Settled Litigation | U.S. Department Of Justice vs. Humana And Aetna
Significant Accounting Policies [Line Items]
Transaction costs (break up fee received)	$ 1,000,000,000
Service
Significant Accounting Policies [Line Items]
Accounts receivable, net, current		$ 123,000,000	$ 180,000,000
Bad-debt expense		0
Contract with customer, asset, net		0
Subsequent Event | Accounting Standards Update 2016-02
Significant Accounting Policies [Line Items]
Operating lease, liability					$ 470,000,000
Operating lease, right-of-use asset					$ 470,000,000
Clinical
Significant Accounting Policies [Line Items]
Goodwill		524,000,000
Provider
Significant Accounting Policies [Line Items]
Goodwill		$ 730,000,000

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ACQUISITIONS AND DIVESTITURES (Detail) $ in Millions							7 Months Ended	12 Months Ended
	Aug. 09, 2018 USD ($)	Aug. 08, 2018 USD ($)	Jul. 11, 2018 USD ($) location State	Jul. 02, 2018 USD ($)	Apr. 10, 2018 USD ($)	Mar. 01, 2018 USD ($)	Aug. 08, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to acquire equity method investments								$ 1,095	$ 0	$ 0
Equity method investment in Kindred at Home								1,047	0
Disposal group, not discontinued operation, gain (loss) on disposal								786	0	0
Acquisitions								616	9
MCCI Holdings LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to acquire businesses, gross						$ 169
Acquisitions						483
Finite-lived intangible assets acquired						80
Business combination, recognized identifiable assets acquired and liabilities assumed, tangible assets						$ 24
Acquired finite-lived intangible assets, weighted average useful life						8 years
Family Physicians Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to acquire businesses, gross					$ 185
Acquisitions					133
Finite-lived intangible assets acquired					38
Business combination, recognized identifiable assets acquired and liabilities assumed, tangible assets					$ 14
Acquired finite-lived intangible assets, weighted average useful life					5 years
MCCI Holdings LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notes receivable, related parties						$ 383
Put Option | Equity Option
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, purchase price allocation, financial asset				$ 236
Call Option | Equity Option
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, purchase price allocation, financial liability				$ 291
Other long-term assets | Put Option | Equity Option
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Financial assets, fair value disclosure								224
Other Noncurrent Liabilities | Call Option | Equity Option
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Financial liabilities fair value disclosure								$ 246
Disposed of by Sale | KMG America Corporation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Parent company cash contributed to sale of subsidiary	$ 805
Disposal group, including discontinued operation, statutory capital	160
Disposal group, not discontinued operation, gain (loss) on disposal	786
Disposal group, not discontinued operation, tax expense (benefit) on disposal	(452)
Revenues							$ 182		261	249
Net income (loss)							$ 47		$ (117)	$ (336)
Disposed of by Sale | Other Noncurrent Liabilities | Call Option | Equity Option | KMG America Corporation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Parent company cash contributed to sale of subsidiary	$ 190
Kanawah Insurance Company
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments for reinsurance		$ 245
Kindred At Home
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage			40.00%	40.00%
Payments to acquire equity method investments				$ 850
Equity method investment in Kindred at Home				$ 1,000
Curo Health Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage			40.00%					40.00%
Payments to acquire equity method investments			$ 250
Equity method investment, number of locations | location			245
Equity method investment, number of states | State			22

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ACQUISITIONS AND DIVESTITURES - Assets and Liabilities Held For Sale (Details) - Disposed of by Sale - KMG America Corporation $ in Millions	Aug. 09, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 805
Receivables, net	3
Investment securities	1,576
Other assets	1,085
Total assets disposed	3,469
Benefits payable	58
Trade accounts payable and accrued expenses	70
Future policy benefits payable	2,573
Total liabilities disposed	$ 2,701

XML

EQUITY METHOD INVESTMENT - Narrative (Details)	Dec. 31, 2018	Jul. 11, 2018
Curo Health Services
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%	40.00%

XML

EQUITY METHOD INVESTMENT - Schedule Of Equity Method Investments (Details) - Kindred At Home $ in Millions	6 Months Ended
	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Current assets	$ 536
Non-current assets	4,955
Current liabilities	351
Non-current liabilities	2,708
Shareholders' equity	2,432
Total revenues	1,587
Expenses	1,451
Net income	$ 27

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INVESTMENT SECURITIES - Schedule of Investment Securities Classified as Current and Long-Term (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Amortized Cost	$ 10,641	$ 12,104
Gross Unrealized Gains	9	286
Gross Unrealized Losses	(213)	(88)
Fair Value	10,437	12,302
U.S. Treasury and agency obligations | U.S. Treasury and other U.S. government corporations and agencies
Investment [Line Items]
Amortized Cost	419	532
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(3)	(2)
Fair Value	417	531
Mortgage-backed securities | U.S. Treasury and other U.S. government corporations and agencies
Investment [Line Items]
Amortized Cost	2,595	1,625
Gross Unrealized Gains	3	4
Gross Unrealized Losses	(54)	(19)
Fair Value	2,544	1,610
Tax-exempt municipal securities
Investment [Line Items]
Amortized Cost	2,805	3,884
Gross Unrealized Gains	3	33
Gross Unrealized Losses	(37)	(28)
Fair Value	2,771	3,889
Residential Mortgage-backed securities
Investment [Line Items]
Amortized Cost	55	26
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	55	26
Commercial Mortgage-backed securities
Investment [Line Items]
Amortized Cost	537	455
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(14)	(2)
Fair Value	523	456
Asset-backed securities
Investment [Line Items]
Amortized Cost	991	407
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(7)	0
Fair Value	985	408
Corporate debt securities
Investment [Line Items]
Amortized Cost	3,239	5,175
Gross Unrealized Gains	1	244
Gross Unrealized Losses	(98)	(37)
Fair Value	$ 3,142	$ 5,382

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INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Values of Securities (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Fair Value	$ 4,574	$ 3,999
Gross Unrealized Losses	(76)	(30)
Fair Value	4,447	2,308
Gross Unrealized Losses	(137)	(58)
Fair Value	9,021	6,307
Gross Unrealized Losses	(213)	(88)
U.S. Treasury and agency obligations | U.S. Treasury and other U.S. government corporations and agencies
Investment [Line Items]
Fair Value	179	273
Gross Unrealized Losses	(1)	(1)
Fair Value	153	130
Gross Unrealized Losses	(2)	(1)
Fair Value	332	403
Gross Unrealized Losses	(3)	(2)
Mortgage-backed securities | U.S. Treasury and other U.S. government corporations and agencies
Investment [Line Items]
Fair Value	956	581
Gross Unrealized Losses	(16)	(2)
Fair Value	1,019	672
Gross Unrealized Losses	(38)	(17)
Fair Value	1,975	1,253
Gross Unrealized Losses	(54)	(19)
Tax-exempt municipal securities
Investment [Line Items]
Fair Value	809	1,590
Gross Unrealized Losses	(9)	(16)
Fair Value	1,648	661
Gross Unrealized Losses	(28)	(12)
Fair Value	2,457	2,251
Gross Unrealized Losses	(37)	(28)
Residential Mortgage-backed securities
Investment [Line Items]
Fair Value	0	20
Gross Unrealized Losses	0	0
Fair Value	15	3
Gross Unrealized Losses	0	0
Fair Value	15	23
Gross Unrealized Losses	0	0
Commercial Mortgage-backed securities
Investment [Line Items]
Fair Value	372	131
Gross Unrealized Losses	(8)	(1)
Fair Value	133	28
Gross Unrealized Losses	(6)	(1)
Fair Value	505	159
Gross Unrealized Losses	(14)	(2)
Asset-backed securities
Investment [Line Items]
Fair Value	824	107
Gross Unrealized Losses	(7)	0
Fair Value	40	10
Gross Unrealized Losses	0	0
Fair Value	864	117
Gross Unrealized Losses	(7)	0
Corporate debt securities
Investment [Line Items]
Fair Value	1,434	1,297
Gross Unrealized Losses	(35)	(10)
Fair Value	1,439	804
Gross Unrealized Losses	(63)	(27)
Fair Value	2,873	2,101
Gross Unrealized Losses	$ (98)	$ (37)

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INVESTMENT SECURITIES - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) position	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Investments, Debt and Equity Securities [Abstract]
Percentage of debt securities considered to be of investment-grade	97.00%
Maximum percentage of any general obligation bonds in one state	9.00%
Number of securities in loss position	1,210
Number of positions	1,500
Other-than-temporary impairments | $	$ 0	$ 0	$ 0

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INVESTMENT SECURITIES - Schedule of Realized Gains (Losses) Related to Investment Securities Included Within Investment Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 106	$ 35	$ 120
Gross realized losses	(16)	(21)	(24)
Net realized capital gains	$ 90	$ 14	$ 96

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INVESTMENT SECURITIES - Schedule of Contractual Maturities of Debt Securities Available for Sale (Detail) $ in Millions	Dec. 31, 2018 USD ($)
Amortized Cost
Due within one year	$ 943
Due after one year through five years	2,929
Due after five years through ten years	1,873
Due after ten years	718
Mortgage and asset-backed securities	4,178
Total debt securities	10,641
Fair Value
Due within one year	941
Due after one year through five years	2,873
Due after five years through ten years	1,810
Due after ten years	706
Mortgage and asset-backed securities	4,107
Total debt securities	$ 10,437

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FAIR VALUE - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	$ 10,437
Measured on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	2,024	$ 4,564
Debt securities	10,437	12,302
Total invested assets	12,461	16,866
Measured on Recurring Basis | Tax-exempt municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	2,771	3,889
Measured on Recurring Basis | Residential Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	55	26
Measured on Recurring Basis | Commercial Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	523	456
Measured on Recurring Basis | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	985	408
Measured on Recurring Basis | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	3,142	5,382
Measured on Recurring Basis | U.S. Treasury and other U.S. government corporations and agencies | U.S. Treasury and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	417	531
Measured on Recurring Basis | U.S. Treasury and other U.S. government corporations and agencies | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	2,544	1,610
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	2,024	4,564
Debt securities	0	0
Total invested assets	2,024	4,564
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | Tax-exempt municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | Residential Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | Commercial Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | U.S. Treasury and other U.S. government corporations and agencies | U.S. Treasury and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | U.S. Treasury and other U.S. government corporations and agencies | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Other Observable Inputs (Level 2) | Measured on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Debt securities	10,437	12,301
Total invested assets	10,437	12,301
Other Observable Inputs (Level 2) | Measured on Recurring Basis | Tax-exempt municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	2,771	3,889
Other Observable Inputs (Level 2) | Measured on Recurring Basis | Residential Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	55	26
Other Observable Inputs (Level 2) | Measured on Recurring Basis | Commercial Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	523	456
Other Observable Inputs (Level 2) | Measured on Recurring Basis | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	985	408
Other Observable Inputs (Level 2) | Measured on Recurring Basis | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	3,142	5,381
Other Observable Inputs (Level 2) | Measured on Recurring Basis | U.S. Treasury and other U.S. government corporations and agencies | U.S. Treasury and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	417	531
Other Observable Inputs (Level 2) | Measured on Recurring Basis | U.S. Treasury and other U.S. government corporations and agencies | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	2,544	1,610
Unobservable Inputs (Level 3) | Measured on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Debt securities	0	1
Total invested assets	0	1
Unobservable Inputs (Level 3) | Measured on Recurring Basis | Tax-exempt municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Unobservable Inputs (Level 3) | Measured on Recurring Basis | Residential Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Unobservable Inputs (Level 3) | Measured on Recurring Basis | Commercial Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Unobservable Inputs (Level 3) | Measured on Recurring Basis | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Unobservable Inputs (Level 3) | Measured on Recurring Basis | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	1
Unobservable Inputs (Level 3) | Measured on Recurring Basis | U.S. Treasury and other U.S. government corporations and agencies | U.S. Treasury and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	0	0
Unobservable Inputs (Level 3) | Measured on Recurring Basis | U.S. Treasury and other U.S. government corporations and agencies | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	$ 0	$ 0

XML

FAIR VALUE - Narrative (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Senior notes	$ 4,774	$ 4,770
Long-term debt, fair value	4,885	5,191
Short-term debt	1,694	150
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term debt	$ 1,295	$ 150

XML

MEDICARE PART D (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Other current assets	$ 3,564	$ 2,949
Trade accounts payable and accrued expenses	(3,067)	(4,069)
Other long-term assets	1,375	2,166
Other long-term liabilities	(581)	(237)
Risk Corridor Settlement
Segment Reporting Information [Line Items]
Other current assets	15	4
Trade accounts payable and accrued expenses	(103)	(255)
Net current liability	(88)	(251)
Other long-term assets	7	0
Other long-term liabilities	(89)	(28)
Net long-term liability	(82)	(28)
Total net liability	(170)	(279)
CMS Subsidies/ Discounts
Segment Reporting Information [Line Items]
Other current assets	172	101
Trade accounts payable and accrued expenses	(503)	(1,085)
Net current liability	(331)	(984)
Other long-term assets	0	0
Other long-term liabilities	0	0
Net long-term liability	0	0
Total net liability	$ (331)	$ (984)

XML

PROPERTY AND EQUIPMENT, NET (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Land	$ 20	$ 20
Buildings and leasehold improvements	766	713
Equipment	890	824
Computer software	2,372	2,003
Property and equipment, gross	4,048	3,560
Accumulated depreciation	(2,313)	(1,976)
Property and equipment, net	$ 1,735	$ 1,584

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PROPERTY AND EQUIPMENT, NET - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 444	$ 410	$ 388
Capitalized internally developed and purchased software amortization	$ 298	$ 287	$ 255

XML

GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill by Reportable Segments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning balance	$ 3,281	$ 3,272
Acquisitions	616	9
Ending balance	3,897	3,281
Retail
Goodwill [Roll Forward]
Beginning balance	1,059	1,059
Acquisitions	476	0
Ending balance	1,535	1,059
Group and Specialty
Goodwill [Roll Forward]
Beginning balance	261	261
Acquisitions	0	0
Ending balance	261	261
Healthcare Services
Goodwill [Roll Forward]
Beginning balance	1,961	1,952
Acquisitions	140	9
Ending balance	$ 2,101	$ 1,961

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GOODWILL AND OTHER INTANGIBLE ASSETS - Details of Intangible Assets Included in Other Long-Term Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	8 years 8 months 12 days
Cost	$ 827	$ 770
Accumulated Amortization	582	544
Net	$ 245	226
Customer contracts/relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	8 years 8 months 12 days
Cost	$ 646	566
Accumulated Amortization	434	401
Net	$ 212	165
Trade names and technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	6 years 4 months 24 days
Cost	$ 84	104
Accumulated Amortization	83	84
Net	$ 1	20
Provider contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	11 years 9 months 18 days
Cost	$ 68	68
Accumulated Amortization	37	30
Net	$ 31	38
Noncompetes and other
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	7 years 3 months 18 days
Cost	$ 29	32
Accumulated Amortization	28	29
Net	$ 1	$ 3

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GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for other intangible assets	$ 90	$ 75	$ 77
Impairment of intangible assets, finite-lived	$ 12

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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Estimated Amortization Expense (Detail) $ in Millions	Dec. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2019	$ 70
2020	67
2021	34
2022	31
2023	$ 18

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BENEFITS PAYABLE - Activity in Benefits Payable (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balances at January 1	$ 4,668	$ 4,563	$ 4,976
Less: Premium deficiency reserve	0	0	(176)
Less: Reinsurance recoverables	(70)	(76)	(85)
Balances at January 1, net		4,598	4,487	$ 4,715
Current year, Incurred	46,385	44,001	45,318
Prior years, Incurred	(503)	(483)	(582)
Total incurred	45,882	43,518	44,736
Current year, Paid	(41,736)	(39,496)	(40,852)
Prior years, Paid	(3,977)	(3,911)	(4,112)
Total paid	(45,713)	(43,407)	(44,964)
Reinsurance recoverable	95	70	76
Balances at December 31	4,862	4,668	4,563
Retail
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balances at January 1	3,963	3,506	3,600
Less: Reinsurance recoverables	(70)	(76)	(85)
Balances at January 1, net		3,893	3,430	3,515
Current year, Incurred	41,323	38,604	37,212
Prior years, Incurred	(398)	(386)	(429)
Total incurred	40,925	38,218	36,783
Current year, Paid	(37,189)	(34,781)	(33,784)
Prior years, Paid	(3,386)	(2,974)	(3,084)
Total paid	(40,575)	(37,755)	(36,868)
Reinsurance recoverable	95	70	76
Balances at December 31	4,338	3,963	3,506
Group and Specialty
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balances at January 1	568	579	616
Less: Reinsurance recoverables	0	0	0
Balances at January 1, net		568	579	616
Current year, Incurred	5,466	5,403	5,271
Prior years, Incurred	(46)	(40)	(46)
Total incurred	5,420	5,363	5,225
Current year, Paid	(4,957)	(4,843)	(4,700)
Prior years, Paid	(514)	(531)	(562)
Total paid	(5,471)	(5,374)	(5,262)
Reinsurance recoverable		0	0
Balances at December 31	517	568	579
Individual Commercial
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balances at January 1	101	454	741
Less: Premium deficiency reserve	0	0	(176)
Balances at January 1, net		101	454	$ 565
Current year, Incurred	0	669	3,677
Prior years, Incurred	(56)	(56)	(106)
Total incurred	(56)	613	3,571
Current year, Paid	0	(583)	(3,233)
Prior years, Paid	(38)	(383)	(449)
Total paid	(38)	(966)	(3,682)
Balances at December 31	$ 7	$ 101	$ 454

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BENEFITS PAYABLE - Favorable Medical Claims Reserve Development (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Favorable Medical Claims Reserve	$ (503)	$ (483)	$ (582)
Retail
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Favorable Medical Claims Reserve	(398)	(386)	(429)
Group and Specialty
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Favorable Medical Claims Reserve	(46)	(40)	(46)
Individual Commercial
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Favorable Medical Claims Reserve	(56)	(56)	(106)
Operating Segments | Retail
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Favorable Medical Claims Reserve	(398)	(386)	(429)
Operating Segments | Group and Specialty
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Favorable Medical Claims Reserve	(46)	(40)	(46)
Operating Segments | Individual Commercial
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Favorable Medical Claims Reserve	(57)	(56)	(106)
Other Businesses
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Favorable Medical Claims Reserve	$ (2)	$ (1)	$ (1)

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BENEFITS PAYABLE - Narrative (Detail) claim in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) claim	Dec. 31, 2017 USD ($) claim	Dec. 31, 2016 USD ($) claim
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Favorable Medical Claims Reserve Development | $	$ 503	$ 483	$ 582
Retail
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total IBNR | $	2,900
Group and Specialty
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total IBNR | $	448
Individual Commercial
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total IBNR | $	$ 1
2018 Claims Incurred Year | Retail
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cumulative Number of Reported Claims - Service Date	104.3
2018 Claims Incurred Year | Group and Specialty
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cumulative Number of Reported Claims - Service Date	10.4
2017 Claims Incurred Year | Retail
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cumulative Number of Reported Claims - Service Date		102.1
2017 Claims Incurred Year | Group and Specialty
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cumulative Number of Reported Claims - Service Date		11.1
2017 Claims Incurred Year | Individual Commercial
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cumulative Number of Reported Claims - Service Date		2.2
2016 Claims Incurred Year | Retail
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cumulative Number of Reported Claims - Service Date			96.2
2016 Claims Incurred Year | Group and Specialty
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cumulative Number of Reported Claims - Service Date			12.9
2016 Claims Incurred Year | Individual Commercial
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cumulative Number of Reported Claims - Service Date			9.5

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BENEFITS PAYABLE - Benefit Expenses Excluded From Activity in Benefits Payable (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Premium deficiency reserve for short-duration policies	$ 0	$ 0	$ (176)
Military services	0	0	8
Future policy benefits	0	(22)	439
Total	$ 0	$ (22)	$ 271

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BENEFITS PAYABLE - Benefits Expense (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefits payable, net of reinsurance	$ 4,767
Reinsurance recoverable on unpaid claims	95	$ 70	$ 76	$ 85
Total benefits payable, gross	4,862	4,668	4,563	4,976
Retail
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	116,475
Cumulative Paid Claims, Net of Reinsurance	112,232
Reinsurance recoverable on unpaid claims	95	70	76	85
Total benefits payable, gross	4,338	3,963	3,506	3,600
Group and Specialty
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	16,059
Cumulative Paid Claims, Net of Reinsurance	15,542
Reinsurance recoverable on unpaid claims		0	0	0
Total benefits payable, gross	517	568	579	616
Individual Commercial
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	4,236
Cumulative Paid Claims, Net of Reinsurance	4,229
Total benefits payable, gross	7	101	454	$ 741
Operating Segments | Retail
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefits payable, net of reinsurance	4,243
Reinsurance recoverable on unpaid claims	95
Operating Segments | Group and Specialty
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefits payable, net of reinsurance	517
Operating Segments | Individual Commercial
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefits payable, net of reinsurance	7
2016 Claims Incurred Year
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cumulative Paid Claims, Net of Reinsurance			33,784
2016 Claims Incurred Year | Retail
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	36,811	36,891	37,212
Cumulative Paid Claims, Net of Reinsurance	36,811	36,841
2016 Claims Incurred Year | Group and Specialty
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	5,235	5,234	5,271
Cumulative Paid Claims, Net of Reinsurance	5,234	5,226	4,700
2016 Claims Incurred Year | Individual Commercial
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	3,609	3,621	3,677
Cumulative Paid Claims, Net of Reinsurance	3,609	3,606	$ 3,233
2017 Claims Incurred Year | Retail
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	38,341	38,604
Cumulative Paid Claims, Net of Reinsurance	38,232	34,781
2017 Claims Incurred Year | Group and Specialty
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	5,358	5,403
Cumulative Paid Claims, Net of Reinsurance	5,351	4,843
2017 Claims Incurred Year | Individual Commercial
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	627	669
Cumulative Paid Claims, Net of Reinsurance	620	$ 583
2018 Claims Incurred Year | Retail
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	41,323
Cumulative Paid Claims, Net of Reinsurance	37,189
2018 Claims Incurred Year | Group and Specialty
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	5,466
Cumulative Paid Claims, Net of Reinsurance	4,957
2018 Claims Incurred Year | Individual Commercial
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incurred Claims, Net of Reinsurance	0
Cumulative Paid Claims, Net of Reinsurance	$ 0

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INCOME TAXES - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal	$ 139	$ 1,324	$ 921
States and Puerto Rico	58	116	88
Total current provision	197	1,440	1,009
Deferred expense (benefit)	194	132	(71)
Provision for income taxes	$ 391	$ 1,572	$ 938

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INCOME TAXES - Provision for Income Taxes Using Federal Statutory Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax provision at federal statutory rate	$ 436	$ 1,407	$ 543
States, net of federal benefit, and Puerto Rico	42	80	41
Tax exempt investment income	(11)	(22)	(20)
Health insurance industry fee	243	0	336
Nondeductible executive compensation	17	36	30
Tax reform	(39)	133	0
KMG sale	(272)	0	0
Other, net	(25)	(62)	8
Provision for income taxes	$ 391	$ 1,572	$ 938

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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Tax reform rate re-measurement		$ 133
Tax Cuts and Jobs Act of 2017, measurement period adjustment, income tax expense (benefit)	$ (39)
Benefit on sale of business	272	0	$ 0
Net operating losses to carryforward related to prior acquisitions	104
Valuation allowances on net operating loss carryforwards related to prior acquisitions	54	49
Puerto Rico
Operating Loss Carryforwards [Line Items]
Repatriation tax for undistributed foreign earnings		$ 10
Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Capital loss carryforward	$ 64

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INCOME TAXES - Principal Components of Net Deferred Tax Balances (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Compensation and other accrued expense	$ 89	$ 138
Benefits payable	79	113
Investment securities	44	0
Net operating loss carryforward	38	53
Capital loss carryforward	15	0
Deferred acquisition costs	17	48
Unearned revenues	9	12
Other	8	1
Future policy benefits payable	0	231
Total deferred income tax assets	299	596
Valuation allowance	(54)	(49)
Total deferred income tax assets, net of valuation allowance	245	547
Depreciable property and intangible assets	(273)	(237)
Prepaid expenses	(52)	(44)
Future policy benefits payable	(5)	0
Investment securities	0	(49)
Total deferred income tax liabilities	(330)	(330)
Total net deferred income tax assets/(liabilities)	$ (85)
Total net deferred income tax assets/(liabilities)		$ 217

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DEBT - Senior Notes (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Nov. 30, 2018
Debt Instrument [Line Items]
Short-term debt	$ 1,694,000,000	$ 150,000,000
Percentage of principal amount that may be redeemed	100.00%
Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 4,375,000,000	4,770,000,000
Loss on extinguishment of debt		17,000,000
Senior Notes | $400 million, 2.625% due October 1, 2019
Debt Instrument [Line Items]
Long-term debt	0	399,000,000
Face amount	$ 400,000,000
Debt instrument, stated interest rate	2.625%
Senior Notes | $400 million, 2.50% due December 15, 2020
Debt Instrument [Line Items]
Long-term debt	$ 398,000,000	397,000,000
Face amount	$ 400,000,000
Debt instrument, stated interest rate	2.50%
Senior Notes | $400 million, 2.90% due December 15, 2022
Debt Instrument [Line Items]
Long-term debt	$ 396,000,000	396,000,000
Face amount	$ 400,000,000
Debt instrument, stated interest rate	2.90%
Senior Notes | $600 million, 3.15% due December 1, 2022
Debt Instrument [Line Items]
Long-term debt	$ 596,000,000	595,000,000
Face amount	$ 600,000,000
Debt instrument, stated interest rate	3.15%
Senior Notes | $600 million, 3.85% due October 1, 2024
Debt Instrument [Line Items]
Long-term debt	$ 597,000,000	595,000,000
Face amount	$ 600,000,000
Debt instrument, stated interest rate	3.85%
Senior Notes | $600 million, 3.95% due March 15, 2027
Debt Instrument [Line Items]
Long-term debt	$ 594,000,000	594,000,000
Face amount	$ 600,000,000
Debt instrument, stated interest rate	3.95%
Senior Notes | $250 million, 8.15% due June 15, 2038
Debt Instrument [Line Items]
Long-term debt	$ 263,000,000	263,000,000
Face amount	$ 250,000,000
Debt instrument, stated interest rate	8.15%
Short-term debt, weighted average interest rate, at point in time	8.15%
Senior Notes | $400 million, 4.625% due December 1, 2042
Debt Instrument [Line Items]
Long-term debt	$ 396,000,000	396,000,000
Face amount	$ 400,000,000
Debt instrument, stated interest rate	4.625%
Senior Notes | $750 million, 4.95% due October 1, 2044
Debt Instrument [Line Items]
Long-term debt	$ 739,000,000	739,000,000
Face amount	$ 750,000,000
Debt instrument, stated interest rate	4.95%
Senior Notes | $400 million, 4.80% due March 15, 2047
Debt Instrument [Line Items]
Long-term debt	$ 396,000,000	396,000,000
Face amount	$ 400,000,000
Debt instrument, stated interest rate	4.80%
Commercial Paper
Debt Instrument [Line Items]
Short-term debt	$ 645,000,000	150,000,000
Notes Payable to Banks
Debt Instrument [Line Items]
Short-term debt	650,000,000	0
Face amount			$ 1,000,000,000.0
Senior Notes | $400 million, 2.625% due October 1, 2019
Debt Instrument [Line Items]
Short-term debt	399,000,000	$ 0
Face amount	$ 400,000,000
Debt instrument, stated interest rate	2.625%

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DEBT - Schedule of Debt Maturities (Details) $ in Millions	Dec. 31, 2018 USD ($)
Debt Disclosure [Abstract]
2019	$ 1,697
2020	400
2021	0
2022	1,000
2023	0
Thereafter	$ 3,000

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DEBT - Credit Agreement (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Short-term debt	$ 1,694,000,000		$ 150,000,000
Debt instrument, covenant, debt to capitalization percentage, maximum	50.00%
Debt instrument, covenant, debt to capitalization percentage	37.00%
Borrowings outstanding under credit agreement	$ 0
Outstanding letters of credit	0
Remaining borrowing capacity	$ 2,000,000,000
Revolving Credit Facility | Line of Credit | Unsecured Revolving Credit Agreement Expires May 2022
Debt Instrument [Line Items]
Term	5 years
Maximum borrowing capacity		$ 2,000,000,000.0
Revolving Credit Facility | Line of Credit | Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 2,500,000,000
Facility fee that is dependent upon credit rating, basis points	0.15%
Uncommitted incremental loan facility	$ 500,000,000
Revolving Credit Facility | Line of Credit | Credit Agreement | Minimum
Debt Instrument [Line Items]
Facility fee that is dependent upon credit rating, basis points	0.09%
Revolving Credit Facility | Line of Credit | Credit Agreement | Maximum
Debt Instrument [Line Items]
Facility fee that is dependent upon credit rating, basis points	0.25%
Revolving Credit Facility | Line of Credit | LIBOR | Credit Agreement
Debt Instrument [Line Items]
Basis points spread over LIBOR	1.10%
Revolving Credit Facility | Line of Credit | LIBOR | Credit Agreement | Minimum
Debt Instrument [Line Items]
Basis points spread over LIBOR	0.91%
Revolving Credit Facility | Line of Credit | LIBOR | Credit Agreement | Maximum
Debt Instrument [Line Items]
Basis points spread over LIBOR	1.50%

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DEBT - Commercial Paper (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Short-term debt	$ 1,694,000,000	$ 150,000,000
Commercial Paper
Short-term Debt [Line Items]
Maximum borrowing capacity	2,000,000,000
Maximum amount outstanding during period	923,000,000
Short-term debt	$ 1,295,000,000	$ 150,000,000
Debt instrument, stated interest rate	3.06%

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DEBT - Term Note (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2018
Short-term Debt [Line Items]
Repayments of short-term debt	$ 350,000,000	$ 0	$ 0
Notes Payable to Banks
Short-term Debt [Line Items]
Face amount				$ 1,000,000,000.0
Debt instrument, interest rate, effective percentage	3.67%
Repayments of short-term debt	$ 350,000,000
Base Rate | Notes Payable to Banks
Short-term Debt [Line Items]
Basis points spread over LIBOR	1.15%
Federal Funds Effective Swap Rate | Notes Payable to Banks
Short-term Debt [Line Items]
Basis points spread over LIBOR	0.50%
LIBOR | Notes Payable to Banks
Short-term Debt [Line Items]
Basis points spread over LIBOR	1.15%
Maximum | Prime Rate | Notes Payable to Banks
Short-term Debt [Line Items]
Basis points spread over LIBOR	1.00%

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EMPLOYEE BENEFIT PLANS - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee retirement and savings plan cost		$ 197,000,000	$ 217,000,000	$ 196,000,000
Closing stock price (in dollars per share)	$ 286.48
Percentage of retirement and savings plan's assets invested in our company common stock		12.00%
Shares of retirement and savings plans invested in company's common stock (in shares)	1.8	1.8
Percentage of the retirement and savings plan's assets invested in our common stock as compared to company's outstanding shares at year-end		1.30%
Number of shares of our common stock reserved for issuance (in shares)	2.0	2.0
Combination of age and years necessary for retirement provision as related to our equity award program		65 years
Minimum age required for retirement eligibility as related to our equity award program		55 years
Minimum number of years of service for retirement eligibility as related to our equity award program		5 years
Limitations on deductibility of excess annual employee compensation as mandated by health insurance reforms		$ 500,000
Employee service share based compensation tax benefit realized from exercise of stock options and restricted stock vesting		$ 49,000,000	68,000,000	53,000,000
Common stock shares reserved for stock award plans (in shares)	13.1	13.1
Fair value of shares vested		$ 298,000,000	306,000,000	253,000,000
Outstanding intrinsic value of stock options	$ 48,000,000	$ 48,000,000
Weighted-average remaining contractual term, years		5 years
Exercisable stock options intrinsic value	$ 19,000,000	$ 19,000,000
Exercisable stock options weighted-average remaining contractual term, years		4 years 1 month 6 days
Total intrinsic value of stock options exercised		$ 43,000,000	44,000,000	18,000,000
Cash received from stock options exercises		$ 50,000,000	63,000,000	$ 14,000,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation modification expense			$ 29,000,000
Weighted-average grant date fair value of restricted stock awards (in USD per share)		$ 276.62	$ 222.35	$ 168.12
Percent of stock with performance-based conditions	12.00%	12.00%
Total compensation expense not yet recognized related to nonvested restricted stock	$ 156,000,000	$ 156,000,000
Compensation expense over a weighted-average period, years		1 year 9 months 18 days
Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense not yet recognized related to nonvested restricted stock	$ 14,000,000	$ 14,000,000
Compensation expense over a weighted-average period, years		1 year 8 months 12 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of year for stock options to vest		1 year
Number of years for stock options to expire		7 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of year for stock options to vest		3 years
2011 Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares available for future grants if all grants are options (in shares)	2.0	2.0
2011 Plan | Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares available for future grants if all grants are options (in shares)	4.7	4.7

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EMPLOYEE BENEFIT PLANS - Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock-based compensation expense by type:
Restricted stock	$ 124	$ 145	$ 106
Stock options	13	12	9
Total stock-based compensation expense	137	157	115
Tax benefit recognized	(21)	(32)	(20)
Stock-based compensation expense, net of tax	$ 116	$ 125	$ 95

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EMPLOYEE BENEFIT PLANS - Weighted-Average Grant Date Fair Value of Restricted Stock Awards (Detail) - Restricted Stock - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shares
Nonvested restricted stock, beginning balance (in shares)	1,653
Granted (in shares)	576
Vested (in shares)	(1,045)
Forfeited (in shares)	(220)
Nonvested restricted stock, ending balance (in shares)	964	1,653
Weighted- Average Grant-Date Fair Value
Nonvested restricted stock, beginning balance (in USD per share)	$ 171.68
Granted (in USD per share)	276.62	$ 222.35	$ 168.12
Vested (in USD per share)	185.82
Forfeited (in USD per share)	180.83
Nonvested restricted stock, ending balance (in USD per share)	$ 213.99	$ 171.68

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EMPLOYEE BENEFIT PLANS - Weighted-Average Fair Value of Stock Options (Detail) - Employee Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value at grant date (in dollars per share)	$ 63.67	$ 49.81	$ 37.12
Expected option life (years)	4 years 1 month	4 years 1 month	4 years 2 months 1 day
Expected volatility	26.10%	27.10%	27.60%
Risk-free interest rate at grant date	2.50%	2.00%	1.10%
Dividend yield	0.70%	0.70%	0.70%

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EMPLOYEE BENEFIT PLANS - Activity for Option Plans (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Shares Under Option
Options outstanding, beginning balance (in shares) | shares	863
Granted (in shares) | shares	143
Exercised (in shares) | shares	(320)
Forfeited (in shares) | shares	(9)
Options outstanding, ending balance (in shares) | shares	677
Options exercisable, ending balance (in shares) | shares	178
Weighted-Average Exercise Price
Options outstanding, beginning balance (in dollars per share) | $ / shares	$ 181.44
Granted (in dollars per share) | $ / shares	276.01
Exercised (in dollars per share) | $ / shares	157.44
Forfeited (in dollars per share) | $ / shares	150.59
Options outstanding, ending balance (in dollars per share) | $ / shares	213.17
Options exercisable, ending balance (in dollars per share) | $ / shares	$ 180.76

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EARNINGS PER COMMON SHARE COMPUTATION - Schedule of Details Supporting Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available for common stockholders	$ 355	$ 644	$ 193	$ 491	$ 184	$ 499	$ 650	$ 1,115	$ 1,683	$ 2,448	$ 614
Weighted-average outstanding shares of common stock used to compute basic earnings per common share (in shares)									137,486	144,493	149,375
Shares used to compute diluted earnings per common share (in shares)									138,403	145,585	150,917
Basic earnings per common share (in USD per share)	$ 2.60	$ 4.68	$ 1.40	$ 3.56	$ 1.30	$ 3.46	$ 4.49	$ 7.54	$ 12.24	$ 16.94	$ 4.11
Diluted earnings per common share (in USD per share)	$ 2.58	$ 4.65	$ 1.39	$ 3.53	$ 1.29	$ 3.44	$ 4.46	$ 7.49	$ 12.16	$ 16.81	$ 4.07
Number of antidilutive stock options and restricted stock awards excluded from computation (in shares)									223	539	748
Employee stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of employee stock options and restricted stock (in shares)									194	172	219
Restricted stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of employee stock options and restricted stock (in shares)									723	920	1,323

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STOCKHOLDERS' EQUITY - Schedule of Details of Dividend Payments (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Amount per Share (in USD per share)	$ 1.9	$ 1.49	$ 1.16
Total Amount	$ 262	$ 216	$ 172

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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands								1 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended	12 Months Ended
	Nov. 29, 2018	Nov. 28, 2018	Nov. 02, 2018	Mar. 26, 2018	Dec. 22, 2017	Aug. 28, 2017	Feb. 22, 2017	Feb. 28, 2019	Mar. 26, 2018	Dec. 31, 2017	Aug. 28, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 21, 2019	Dec. 21, 2017	Dec. 14, 2017	Feb. 16, 2017	Feb. 14, 2017
Equity, Class of Treasury Stock [Line Items]
Cash dividend declared (in USD per share)			$ 0.5
Total amount												$ 262,000,000	$ 216,000,000	$ 172,000,000
Share repurchase authorization																	$ 3,000,000,000.0		$ 2,250,000,000.00
Value of shares repurchased												$ 1,090,000,000	$ 3,365,000,000	$ 104,000,000
Common shares acquired in connection with employee stock plans (in shares)												400	500	600
Common shares acquired in connection with employee stock plans, amount												$ 116,000,000	$ 115,000,000	$ 104,000,000
Aggregate statutory capital and surplus in our state regulated insurance subsidiaries										$ 8,000,000,000		7,600,000,000	8,000,000,000
Aggregate minimum regulatory requirements of statutory capital and surplus										$ 4,800,000,000		5,200,000,000	4,800,000,000
Dividends that may be paid to the parent company without prior approval by state regulatory authorities in 2014												1,000,000,000
Dividends that were paid to the parent company without prior approval by state regulatory authorities												2,300,000,000	$ 1,400,000,000	$ 800,000,000
Dividend Declared
Equity, Class of Treasury Stock [Line Items]
Total amount												68,000,000
February 2017 ASR
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization																		$ 1,500,000,000.0
Share repurchase payment							$ 1,500,000,000
Shares repurchased in open market (in shares)						840	5,830			3,040	6,670
Value of shares repurchased						$ 300,000,000	$ 1,200,000,000			$ 750,000,000
Decrease in capital in excess of par value							$ 300,000,000
Average cost per share (in USD per share)											$ 224.81
December 2017 ASR
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization		$ 3,000,000,000.0														$ 1,000,000,000.0
Share repurchase payment					$ 1,000,000,000
Shares repurchased in open market (in shares)				460	3,280				3,740
Value of shares repurchased				$ 200,000,000	$ 800,000,000
Decrease in capital in excess of par value		150,000,000			$ 200,000,000
Average cost per share (in USD per share)									$ 267.55
November 2018 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization		$ 750,000,000
Share repurchase payment	$ 750,000,000
Shares repurchased in open market (in shares)	1,940
Value of shares repurchased	$ 600,000,000
Decrease in capital in excess of par value	$ 150,000,000
February 2017 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization												$ 2,250,000,000
Shares repurchased in open market (in shares)												0	9,710	0
Value of shares repurchased												$ 0	$ 2,250,000,000	$ 0
December 2017 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization												$ 3,000,000,000
Shares repurchased in open market (in shares)												3,070	3,280	0
Value of shares repurchased												$ 1,024,000,000	$ 800,000,000	$ 0
Excluding Employee Stock Plans and ASR
Equity, Class of Treasury Stock [Line Items]
Shares repurchased in open market (in shares)												3,070	12,990	0
Value of shares repurchased												$ 1,024,000,000	$ 3,050,000,000	$ 0
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Remaining authorized amount															$ 1,176,000,000
Subsequent Event | Dividend Declared
Equity, Class of Treasury Stock [Line Items]
Cash dividend declared (in USD per share)								$ 0.55

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STOCKHOLDERS' EQUITY - Treasury Stock Schedule (Details) - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 14, 2017	Feb. 14, 2017
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization				$ 3,000,000,000.0	$ 2,250,000,000.00
Value of shares repurchased	$ 1,090,000,000	$ 3,365,000,000	$ 104,000,000
February 2017 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization	$ 2,250,000,000
Shares repurchased in open market (in shares)	0	9,710	0
Value of shares repurchased	$ 0	$ 2,250,000,000	$ 0
December 2017 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization	$ 3,000,000,000
Shares repurchased in open market (in shares)	3,070	3,280	0
Value of shares repurchased	$ 1,024,000,000	$ 800,000,000	$ 0
Excluding Employee Stock Plans and ASR
Equity, Class of Treasury Stock [Line Items]
Shares repurchased in open market (in shares)	3,070	12,990	0
Value of shares repurchased	$ 1,024,000,000	$ 3,050,000,000	$ 0

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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Rent Expense and Sublease Rental Income Associated With Operating Leases (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 167	$ 204	$ 179
Sublease rental income	(32)	(33)	(26)
Net rent expense	$ 135	$ 171	$ 153

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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Future Annual Minimum Payments Due (Detail) $ in Millions	Dec. 31, 2018 USD ($)
Minimum Lease Payments
2019	$ 147
2020	113
2021	96
2022	79
2023	34
Thereafter	50
Total	519
Sublease Rental Receipts
2019	(13)
2020	(12)
2021	(10)
2022	(9)
2023	(9)
Thereafter	(23)
Total	(76)
Net Lease Commitments
2019	134
2020	101
2021	86
2022	70
2023	25
Thereafter	27
Total	$ 443

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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Additional Information (Detail) beneficiary in Millions, $ in Millions		12 Months Ended
	Jan. 01, 2018 beneficiary	Dec. 31, 2018 USD ($) State	Nov. 02, 2017 USD ($)
Loss Contingencies [Line Items]
Purchase obligations in 2019		$ 240
Purchase obligations in 2020		201
Purchase obligations in 2021		136
Purchase obligations in 2022		98
Purchase obligations in 2023		$ 61
Number of states comprising TRICARE beneficiaries | State		32
Number of TRICARE beneficiaries | beneficiary	6
Litigation recoveries sought			$ 611
Tricare East Region Contract
Loss Contingencies [Line Items]
Contract term years		5 years
Total Medicare
Loss Contingencies [Line Items]
Percentage of premiums and services revenue		80.00%
Military services
Loss Contingencies [Line Items]
Percentage of premiums and services revenue		1.00%
Medicaid
Loss Contingencies [Line Items]
Percentage of premiums and services revenue		4.00%

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SEGMENT INFORMATION - Additional Information (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segment		4
Member co-share amounts and government subsidies		$ 13,400	$ 13,500	$ 13,400
Depreciation and amortization classified as benefit expense		$ 129	$ 107	$ 111
Percentage of total premium and services revenues derived from contracts with the federal government		81.00%	79.00%	75.00%
Premiums reduction, write off of risk corridor receivables	$ 583
Long-term insurance reserve strengthening expense				$ 505

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SEGMENT INFORMATION - Information by Segment (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Premiums									$ 54,941	$ 52,380	$ 53,021
Services									1,457	982	969
Investment income									514	405	389
Total revenues	$ 14,168	$ 14,206	$ 14,259	$ 14,279	$ 13,189	$ 13,282	$ 13,534	$ 13,762	56,912	53,767	54,379
Benefits									45,882	43,496	45,007
Operating costs									7,525	6,567	7,173
Merger termination fee and related costs, net									0	(936)	104
Depreciation and amortization									405	378	354
Total operating expenses									53,812	49,505	52,638
Income from operations									3,100	4,262	1,741
Loss on sale of business									786	0	0
Interest expense									218	242	189
Other expense, net									33	0	0
Income (loss) before income taxes and equity in net earnings	$ 436	$ 901	$ 19	$ 707	$ 490	$ 799	$ 1,042	$ 1,689	2,063	4,020	1,552
Equity in net earnings of Kindred at Home									11	0	0
Segment earnings (losses)									2,074	4,020	1,552
Individual Medicare Advantage
Segment Reporting Information [Line Items]
Premiums									35,656	32,720	31,863
Group Medicare Advantage
Segment Reporting Information [Line Items]
Premiums									6,103	5,155	4,283
Medicare stand-alone PDP
Segment Reporting Information [Line Items]
Premiums									3,584	3,702	4,009
Total Medicare
Segment Reporting Information [Line Items]
Premiums									45,343	41,577	40,155
Fully-insured
Segment Reporting Information [Line Items]
Premiums									5,962	6,887	8,897
Specialty
Segment Reporting Information [Line Items]
Premiums									1,359	1,310	1,279
Medicaid and other
Segment Reporting Information [Line Items]
Premiums									2,277	2,606	2,690
Provider
Segment Reporting Information [Line Items]
Services									404	258	278
ASO and other
Segment Reporting Information [Line Items]
Services									850	644	660
Pharmacy
Segment Reporting Information [Line Items]
Services									203	80	31
External Customers
Segment Reporting Information [Line Items]
Total revenues									56,398	53,362	53,990
Operating Segments | Retail
Segment Reporting Information [Line Items]
Premiums									48,108	44,626	43,223
Services									11	10	6
Investment income									136	90	90
Total revenues									48,255	44,726	43,319
Benefits									40,925	38,218	36,783
Operating costs									5,327	4,292	4,650
Merger termination fee and related costs, net										0	0
Depreciation and amortization									270	238	196
Total operating expenses									46,522	42,748	41,629
Income from operations									1,733	1,978	1,690
Loss on sale of business									0		0
Interest expense									0	0	0
Other expense, net									0
Income (loss) before income taxes and equity in net earnings									1,733	1,978	1,690
Equity in net earnings of Kindred at Home									0	0	0
Segment earnings (losses)									1,733	1,978	1,690
Operating Segments | Group and Specialty
Segment Reporting Information [Line Items]
Premiums									6,803	6,772	6,696
Services									835	626	643
Investment income									23	31	25
Total revenues									7,679	7,449	7,386
Benefits									5,420	5,363	5,233
Operating costs									1,810	1,590	1,727
Merger termination fee and related costs, net										0	0
Depreciation and amortization									88	84	82
Total operating expenses									7,318	7,037	7,042
Income from operations									361	412	344
Loss on sale of business									0		0
Interest expense									0	0	0
Other expense, net									0
Income (loss) before income taxes and equity in net earnings									361	412	344
Equity in net earnings of Kindred at Home									0	0	0
Segment earnings (losses)									361	412	344
Operating Segments | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Services									607	338	310
Investment income									34	35	30
Total revenues									23,811	23,958	25,312
Benefits									0	0	0
Operating costs									22,905	22,848	24,073
Merger termination fee and related costs, net										0	0
Depreciation and amortization									163	143	143
Total operating expenses									23,068	22,991	24,216
Income from operations									743	967	1,096
Loss on sale of business									0		0
Interest expense									0	0	0
Other expense, net									0
Income (loss) before income taxes and equity in net earnings									743	967	1,096
Equity in net earnings of Kindred at Home									11	0	0
Segment earnings (losses)									754	967	1,096
Operating Segments | Individual Commercial
Segment Reporting Information [Line Items]
Premiums									8	947	3,064
Services									0	0	0
Investment income									0	4	5
Total revenues									8	951	3,069
Benefits									(70)	544	3,301
Operating costs									4	201	601
Merger termination fee and related costs, net										0	0
Depreciation and amortization									0	13	36
Total operating expenses									(66)	758	3,938
Income from operations									74	193	(869)
Loss on sale of business									0		0
Interest expense									0	0	0
Other expense, net									0
Income (loss) before income taxes and equity in net earnings									74	193	(869)
Equity in net earnings of Kindred at Home									0	0	0
Segment earnings (losses)									74	193	(869)
Operating Segments | Individual Medicare Advantage | Retail
Segment Reporting Information [Line Items]
Premiums									35,656	32,720	31,863
Operating Segments | Individual Medicare Advantage | Group and Specialty
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Individual Medicare Advantage | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Individual Medicare Advantage | Individual Commercial
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Group Medicare Advantage | Retail
Segment Reporting Information [Line Items]
Premiums									6,103	5,155	4,283
Operating Segments | Group Medicare Advantage | Group and Specialty
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Group Medicare Advantage | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Group Medicare Advantage | Individual Commercial
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Medicare stand-alone PDP | Retail
Segment Reporting Information [Line Items]
Premiums									3,584	3,702	4,009
Operating Segments | Medicare stand-alone PDP | Group and Specialty
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Medicare stand-alone PDP | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Medicare stand-alone PDP | Individual Commercial
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Total Medicare | Retail
Segment Reporting Information [Line Items]
Premiums									45,343	41,577	40,155
Operating Segments | Total Medicare | Group and Specialty
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Total Medicare | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Total Medicare | Individual Commercial
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Fully-insured | Retail
Segment Reporting Information [Line Items]
Premiums									510	478	428
Operating Segments | Fully-insured | Group and Specialty
Segment Reporting Information [Line Items]
Premiums									5,444	5,462	5,405
Operating Segments | Fully-insured | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Fully-insured | Individual Commercial
Segment Reporting Information [Line Items]
Premiums									8	947	3,064
Operating Segments | Specialty | Retail
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Specialty | Group and Specialty
Segment Reporting Information [Line Items]
Premiums									1,359	1,310	1,279
Operating Segments | Specialty | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Specialty | Individual Commercial
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Medicaid and other | Retail
Segment Reporting Information [Line Items]
Premiums									2,255	2,571	2,640
Operating Segments | Medicaid and other | Group and Specialty
Segment Reporting Information [Line Items]
Premiums									0	0	12
Operating Segments | Medicaid and other | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Medicaid and other | Individual Commercial
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Provider | Retail
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | Provider | Group and Specialty
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | Provider | Healthcare Services
Segment Reporting Information [Line Items]
Services									404	258	278
Operating Segments | Provider | Individual Commercial
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | ASO and other | Retail
Segment Reporting Information [Line Items]
Services									11	10	6
Operating Segments | ASO and other | Group and Specialty
Segment Reporting Information [Line Items]
Services									835	626	643
Operating Segments | ASO and other | Healthcare Services
Segment Reporting Information [Line Items]
Services									0	0	1
Operating Segments | ASO and other | Individual Commercial
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | Pharmacy | Retail
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | Pharmacy | Group and Specialty
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | Pharmacy | Healthcare Services
Segment Reporting Information [Line Items]
Services									203	80	31
Operating Segments | Pharmacy | Individual Commercial
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | External Customers | Retail
Segment Reporting Information [Line Items]
Total revenues									48,119	44,636	43,229
Operating Segments | External Customers | Group and Specialty
Segment Reporting Information [Line Items]
Total revenues									7,638	7,398	7,339
Operating Segments | External Customers | Healthcare Services
Segment Reporting Information [Line Items]
Total revenues									607	338	310
Operating Segments | External Customers | Individual Commercial
Segment Reporting Information [Line Items]
Total revenues									8	947	3,064
Other Businesses
Segment Reporting Information [Line Items]
Premiums									22	35	38
Services									4	8	10
Investment income									110	87	66
Total revenues									136	130	114
Benefits									77	131	617
Operating costs									6	12	16
Merger termination fee and related costs, net										0	0
Depreciation and amortization									0	0	1
Total operating expenses									83	143	634
Income from operations									53	(13)	(520)
Loss on sale of business									0		0
Interest expense									0	0	0
Other expense, net									0
Income (loss) before income taxes and equity in net earnings									53	(13)	(520)
Equity in net earnings of Kindred at Home									0	0	0
Segment earnings (losses)									53	(13)	(520)
Other Businesses | Individual Medicare Advantage
Segment Reporting Information [Line Items]
Premiums									0	0	0
Other Businesses | Group Medicare Advantage
Segment Reporting Information [Line Items]
Premiums									0	0	0
Other Businesses | Medicare stand-alone PDP
Segment Reporting Information [Line Items]
Premiums									0	0	0
Other Businesses | Total Medicare
Segment Reporting Information [Line Items]
Premiums									0	0	0
Other Businesses | Fully-insured
Segment Reporting Information [Line Items]
Premiums									0	0	0
Other Businesses | Specialty
Segment Reporting Information [Line Items]
Premiums									0	0	0
Other Businesses | Medicaid and other
Segment Reporting Information [Line Items]
Premiums									22	35	38
Other Businesses | Provider
Segment Reporting Information [Line Items]
Services									0	0	0
Other Businesses | ASO and other
Segment Reporting Information [Line Items]
Services									4	8	10
Other Businesses | Pharmacy
Segment Reporting Information [Line Items]
Services									0	0	0
Other Businesses | External Customers
Segment Reporting Information [Line Items]
Total revenues									26	43	48
Corporate/Eliminations
Segment Reporting Information [Line Items]
Services										0
Investment income									211	158	173
Total revenues									(22,977)	(23,447)	(24,821)
Benefits									(470)	(760)	(927)
Operating costs									(22,527)	(22,376)	(23,894)
Merger termination fee and related costs, net										(936)	104
Depreciation and amortization									(116)	(100)	(104)
Total operating expenses									(23,113)	(24,172)	(24,821)
Income from operations									136	725	0
Loss on sale of business									(786)		0
Interest expense									218	242	189
Other expense, net									(33)
Income (loss) before income taxes and equity in net earnings									(901)	483	(189)
Equity in net earnings of Kindred at Home									0	0	0
Segment earnings (losses)									(901)	483	(189)
Corporate/Eliminations | Provider
Segment Reporting Information [Line Items]
Services										0
Corporate/Eliminations | ASO and other
Segment Reporting Information [Line Items]
Services										0
Corporate/Eliminations | Pharmacy
Segment Reporting Information [Line Items]
Services										0
Corporate/Eliminations | External Customers
Segment Reporting Information [Line Items]
Total revenues										0
Intersegment revenues
Segment Reporting Information [Line Items]
Total revenues									(23,188)	(23,605)	(24,994)
Intersegment revenues | Retail
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Group and Specialty
Segment Reporting Information [Line Items]
Total revenues									18	20	22
Intersegment revenues | Healthcare Services
Segment Reporting Information [Line Items]
Total revenues									23,170	23,585	24,972
Intersegment revenues | Individual Commercial
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Services
Segment Reporting Information [Line Items]
Total revenues									(16,858)	(17,313)	(19,001)
Intersegment revenues | Services | Retail
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Services | Group and Specialty
Segment Reporting Information [Line Items]
Total revenues									18	20	22
Intersegment revenues | Services | Healthcare Services
Segment Reporting Information [Line Items]
Total revenues									16,840	17,293	18,979
Intersegment revenues | Services | Individual Commercial
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Products
Segment Reporting Information [Line Items]
Total revenues									(6,330)	(6,292)	(5,993)
Intersegment revenues | Products | Retail
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Products | Group and Specialty
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Products | Healthcare Services
Segment Reporting Information [Line Items]
Total revenues									6,330	6,292	5,993
Intersegment revenues | Products | Individual Commercial
Segment Reporting Information [Line Items]
Total revenues									$ 0	$ 0	$ 0

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EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Long Duration Insurance Products [Line Items]
Percent of consolidated premiums and services revenues related to long-duration insurance products	1.00%	1.00%
Future policy benefits payable	$ 219,000,000	$ 2,923,000,000
Benefit expense with future policy benefits payable	0	(22,000,000)	$ 439,000,000
Long-term insurance reserve strengthening expense			505,000,000
Amortization of deferred acquisition costs	48,000,000	71,000,000	67,000,000
Deferred acquisition costs associated with our individual major medical policies		3,000,000
Adjustment to future policy benefits assuming unrealized gains on investments realized and reinvested at current yields		168,000,000
Increase in future policy benefits payable			659,000,000
Increase in reinsurance recoverable			154,000,000
Premium deficiency reserve	0	0	$ 0	$ 176,000,000
100% Coinsurance Agreements
Long Duration Insurance Products [Line Items]
Future policy benefits payable	$ 217,000,000	199,000,000
Percentage of coinsurance agreement	100.00%
Individual Major Medical Policies
Long Duration Insurance Products [Line Items]
Future policy benefits payable		19,000,000
Closed Block Long Term Care Policies
Long Duration Insurance Products [Line Items]
Future policy benefits payable		$ 2,300,000,000

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EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS - Schedule of Deferred Acquisition Cost and Future Policy Benefits Payable With Our Long-Duration Insurance Products (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Insurance [Abstract]
Other long-term assets, Deferred acquisition costs	$ 36	$ 103
Trade accounts payable and accrued expenses, Deferred acquisition cost	0	0
Long-term liabilities, Deferred acquisition cost	0	0
Total asset (liability), Deferred acquisition cost	36	103
Other long-term assets, Future policy benefits payable	0	0
Trade accounts payable and accrued expenses, Future policy benefits payable	0	(56)
Long-term liabilities, Future policy benefits payable	(219)	(2,923)
Total asset (liability), Future policy benefits payable	$ (219)	$ (2,979)

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REINSURANCE - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Reinsurer	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Effects of Reinsurance [Line Items]
Reinsurance recoverables included in other long-term assets	$ 314	$ 824
Premiums ceded	976	969	$ 842
Benefits ceded	$ 980	$ 844	$ 767
Number of reinsurers comprising other reinsurance recoverables balance | Reinsurer	10
Cash and securities in trusts held by certain reinsurers	$ 110
100% Coinsurance Agreements
Effects of Reinsurance [Line Items]
Percentage of coinsurance agreement	100.00%
Reinsurance Recoverables | Reinsurer Concentration Risk
Effects of Reinsurance [Line Items]
Percentage of reinsurance recoverables resulting from 100% coinsurance agreements	99.00%	33.00%
Protective Life Insurance Company
Effects of Reinsurance [Line Items]
Reinsurance recoverables included in other long-term assets	$ 177
All Others
Effects of Reinsurance [Line Items]
Reinsurance recoverables included in other long-term assets	$ 137

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QUARTERLY FINANCIAL INFORMATION (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 14,168	$ 14,206	$ 14,259	$ 14,279	$ 13,189	$ 13,282	$ 13,534	$ 13,762	$ 56,912	$ 53,767	$ 54,379
Income (loss) before income taxes	436	901	19	707	490	799	1,042	1,689	2,063	4,020	1,552
Net income	$ 355	$ 644	$ 193	$ 491	$ 184	$ 499	$ 650	$ 1,115	$ 1,683	$ 2,448	$ 614
Basic earnings per common share (in USD per share)	$ 2.60	$ 4.68	$ 1.40	$ 3.56	$ 1.30	$ 3.46	$ 4.49	$ 7.54	$ 12.24	$ 16.94	$ 4.11
Diluted earnings per common share (in USD per share)	$ 2.58	$ 4.65	$ 1.39	$ 3.53	$ 1.29	$ 3.44	$ 4.46	$ 7.49	$ 12.16	$ 16.81	$ 4.07

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SCHEDULE I-PARENT COMPANY FINANCIAL INFORMATION (Condensed Balance Sheets) (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 2,343	$ 4,042	$ 3,877	$ 2,571
Investment securities	10,026	9,557
Other current assets	3,564	2,949
Total current assets	16,948	17,402
Property and equipment, net	1,735	1,584
Equity method investment in Kindred at Home	1,047	0
Other long-term assets	1,375	2,166
Total assets	25,413	27,178
Current liabilities:
Book overdraft	171	141
Short-term debt	1,694	150
Total current liabilities	10,077	9,406
Long-term debt	4,375	4,770
Other long-term liabilities	581	237
Total liabilities	15,252	17,336
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	0	0
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,594,841 shares issued at December 31, 2018 and 198,572,458 shares issued at December 31, 2017	33	33
Capital in excess of par value	2,535	2,445
Retained earnings	15,072	13,670
Accumulated other comprehensive (loss) income	(159)	19
Treasury stock, at cost, 63,028,169 shares at December 31, 2018 and 60,893,762 shares at December 31, 2017	(7,320)	(6,325)
Total stockholders’ equity	10,161	9,842	10,685	10,346
Total liabilities and stockholders’ equity	25,413	27,178
Parent Company
Current assets:
Cash and cash equivalents	265	383	$ 1,710	$ 1,389
Investment securities	313	305
Receivable from operating subsidiaries	1,306	1,042
Other current assets	628	245
Total current assets	2,512	1,975
Property and equipment, net	1,209	1,091
Investments in subsidiaries	16,951	16,810
Equity method investment in Kindred at Home	1,047	0
Other long-term assets	359	426
Total assets	22,078	20,302
Current liabilities:
Payable to operating subsidiaries	4,487	4,311
Current portion of notes payable to operating subsidiaries	28	28
Book overdraft	38	41
Short-term debt	1,694	150
Other current liabilities	791	896
Total current liabilities	7,038	5,426
Long-term debt	4,375	4,770
Other long-term liabilities	504	264
Total liabilities	11,917	10,460
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	0	0
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,594,841 shares issued at December 31, 2018 and 198,572,458 shares issued at December 31, 2017	33	33
Capital in excess of par value	2,535	2,445
Retained earnings	15,072	13,670
Accumulated other comprehensive (loss) income	(159)	19
Treasury stock, at cost, 63,028,169 shares at December 31, 2018 and 60,893,762 shares at December 31, 2017	(7,320)	(6,325)
Total stockholders’ equity	10,161	9,842
Total liabilities and stockholders’ equity	$ 22,078	$ 20,302

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SCHEDULE I-PARENT COMPANY FINANCIAL INFORMATION (Condensed Balance Sheets) Phantom (Detail) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Preferred stock, par (in USD per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par (in USD per share)	$ 0.1667	$ 0.1667
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	198,594,841	198,572,458
Treasury stock (in shares)	63,028,169	60,893,762
Parent Company
Condensed Financial Statements, Captions [Line Items]
Preferred stock, par (in USD per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par (in USD per share)	$ 0.1667	$ 0.1667
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	198,594,841	198,572,458
Treasury stock (in shares)	63,028,169	60,893,762

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SCHEDULE I-PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Income) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Total revenues	$ 14,168	$ 14,206	$ 14,259	$ 14,279	$ 13,189	$ 13,282	$ 13,534	$ 13,762	$ 56,912	$ 53,767	$ 54,379
Expenses:
Operating costs									7,525	6,567	7,173
Merger termination fee and related costs, net									0	(936)	104
Depreciation									444	410	388
Interest									218	242	189
Total operating expenses									53,812	49,505	52,638
Other expense, net									33	0	0
Loss on sale of business									786	0	0
(Benefit) provision for income taxes									391	1,572	938
Equity in net earnings of Kindred at Home									11	0	0
Net income	$ 355	$ 644	$ 193	$ 491	$ 184	$ 499	$ 650	$ 1,115	1,683	2,448	614
Parent Company
Revenues:
Management fees charged to operating subsidiaries									1,666	1,864	1,683
Investment and other income, net									30	57	42
Total revenues									1,696	1,921	1,725
Expenses:
Operating costs									1,468	1,801	1,519
Merger termination fee and related costs, net									0	(936)	104
Depreciation									342	332	302
Interest									218	243	189
Total operating expenses									2,028	1,440	2,114
Other expense, net									33	0	0
Loss on sale of business									782	0	0
(Loss) income before income taxes and equity in net earnings of subsidiaries									(1,147)	481	(389)
(Benefit) provision for income taxes									(542)	61	(107)
(Loss) income before equity in net earnings of subsidiaries									(605)	420	(282)
Equity in net earnings of subsidiaries									2,277	2,028	896
Equity in net earnings of Kindred at Home									11	0	0
Net income									$ 1,683	$ 2,448	$ 614

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SCHEDULE I-PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Net income	$ 355	$ 644	$ 193	$ 491	$ 184	$ 499	$ 650	$ 1,115	$ 1,683	$ 2,448	$ 614
Other comprehensive income (loss):
Change in gross unrealized investment losses/gains									(189)	149	(101)
Effect of income taxes									51	(55)	38
Total change in unrealized investment gains/losses, net of tax									(138)	94	(63)
Reclassification adjustment for net realized gains included in investment income									(53)	(14)	(96)
Effect of income taxes									17	5	35
Total reclassification adjustment, net of tax									(36)	(9)	(61)
Other comprehensive (loss) income, net of tax									(174)	85	(124)
Comprehensive income attributable to our equity method investment in Kindred at Home									(4)	0	0
Comprehensive income									1,505	2,533	490
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income									1,683	2,448	614
Other comprehensive income (loss):
Change in gross unrealized investment losses/gains									(189)	149	(101)
Effect of income taxes									51	(55)	38
Total change in unrealized investment gains/losses, net of tax									(138)	94	(63)
Reclassification adjustment for net realized gains included in investment income									(53)	(14)	(96)
Effect of income taxes									17	5	35
Total reclassification adjustment, net of tax									(36)	(9)	(61)
Other comprehensive (loss) income, net of tax									(174)	85	(124)
Comprehensive income attributable to our equity method investment in Kindred at Home									(4)	0	0
Comprehensive income									$ 1,505	$ 2,533	$ 490

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SCHEDULE I-PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Cash Flows) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 2,173	$ 4,051	$ 1,936
Cash flows from investing activities:
Acquisitions, net of cash acquired	(354)	(31)	(7)
Acquisition, equity method investment in Kindred at Home	(1,095)	0	0
Purchases of investment securities	(4,687)	(6,265)	(6,566)
Proceeds from sale of investment securities	3,494	2,768	4,312
Maturities of investment securities	972	1,111	1,426
Purchases of property and equipment, net	(612)	(524)	(527)
Net cash used in investing activities	(3,087)	(2,941)	(1,362)
Cash flows from financing activities:
Proceeds from issuance of senior notes, net	0	1,779	0
Proceeds from issuance (repayments) of commercial paper, net	485	(153)	(2)
Proceeds from term loan	1,000	0	0
Repayment of term loan	(350)	0	0
Repayment of long-term debt	0	(800)	0
Change in book overdraft	30	(71)	(89)
Common stock repurchases	(1,090)	(3,365)	(104)
Dividends paid	(265)	(220)	(177)
Proceeds from stock option exercises and other, net	50	63	14
Net cash (used in) provided by financing activities	(785)	(945)	732
(Decrease) increase in cash and cash equivalents	(1,699)	165	1,306
Cash and cash equivalents at beginning of year	4,042	3,877	2,571
Cash and cash equivalents at end of year	2,343	4,042	3,877
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	2,719	2,423	1,848
Cash flows from investing activities:
Acquisitions, net of cash acquired	(354)	0	0
Acquisition, equity method investment in Kindred at Home	(1,095)	0	0
Capital contributions to operating subsidiaries	(697)	(695)	(895)
Purchases of investment securities	(145)	(53)	(151)
Proceeds from sale of investment securities	35	0	25
Maturities of investment securities	59	51	143
Purchases of property and equipment, net	(465)	(359)	(382)
Net cash used in investing activities	(2,662)	(1,056)	(1,260)
Cash flows from financing activities:
Proceeds from issuance of senior notes, net	0	1,779	0
Proceeds from issuance (repayments) of commercial paper, net	485	(153)	(2)
Proceeds from term loan	1,000	0	0
Repayment of term loan	(350)	0	0
Repayment of long-term debt	0	(800)	0
Change in book overdraft	(3)	3	5
Common stock repurchases	(1,090)	(3,365)	(104)
Dividends paid	(265)	(220)	(177)
Proceeds from stock option exercises and other, net	48	62	11
Net cash (used in) provided by financing activities	(175)	(2,694)	(267)
(Decrease) increase in cash and cash equivalents	(118)	(1,327)	321
Cash and cash equivalents at beginning of year	383	1,710	1,389
Cash and cash equivalents at end of year	$ 265	$ 383	$ 1,710

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SCHEDULE I-PARENT COMPANY FINANCIAL INFORMATION (Additional Information) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Cash dividends received from subsidiary	$ 2,300	$ 1,400	$ 800
Aggregate statutory capital and surplus in our state regulated insurance subsidiaries	7,600	8,000
Aggregate minimum regulatory requirements of statutory capital and surplus	5,200	4,800
Dividends that may be paid to the parent company without prior approval by state regulatory authorities in 2014	1,000
Dividends that were paid to the parent company without prior approval by state regulatory authorities	$ 2,300	1,400	800
Majority-Owned Subsidiary, Unconsolidated
Condensed Financial Statements, Captions [Line Items]
Interest expense on subsidiary notes payable		$ 1	$ 1

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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for loss on receivables:
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ (96)	$ (118)	$ (101)
Acquired/(Disposed) Balances	0	0	0
Charged (Credited) to Costs and Expenses	36	20	39
Charged to Other Accounts	(29)	(10)	19
Deductions or Write-offs	(24)	(32)	(41)
Balance at End of Period	(79)	(96)	(118)
Deferred tax asset valuation allowance:
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	(49)	(49)	(42)
Acquired/(Disposed) Balances	0	0	0
Charged (Credited) to Costs and Expenses	(5)	0	(7)
Charged to Other Accounts	0	0	0
Deductions or Write-offs	0	0	0
Balance at End of Period	$ (54)	$ (49)	$ (49)