10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

[x] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2016

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 1-5823

CNA FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization) 36-6169860 (I.R.S. Employer Identification No.)

333 S. Wabash Chicago, Illinois (Address of principal executive offices) 60604 (Zip Code)

(312) 822-5000

(Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Common Stock with a par value of $2.50 per share Name of each exchange on which registered New York Stock Exchange Chicago 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 [x] 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 [x]

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 [x] No [ ]

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files). Yes [x] 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. [x]

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

Large accelerated filer [x] Accelerated filer [ ] Non-accelerated filer (Do not check if a smaller reporting company) [ ] Smaller reporting company [ ]

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

As of February 10, 2017, 270,621,400 shares of common stock were outstanding. The aggregate market value of the common stock held by non-affiliates of the registrant as of June 30, 2016 was approximately $844 million based on the closing price of $31.42 per share of the common stock on the New York Stock Exchange on June 30, 2016.

DOCUMENTS INCORPORATED BY REFERENCE:

Portions of the CNA Financial Corporation Proxy Statement prepared for the 2017 annual meeting of shareholders, pursuant to Regulation 14A, are incorporated by reference into Part III of this report.

Item Number		Page Number
	PART I
1.	Business	3
1A.	Risk Factors	6
1B.	Unresolved Staff Comments	14
2.	Properties	14
3.	Legal Proceedings	14
4.	Mine Safety Disclosures	14
	PART II
5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	15
6.	Selected Financial Data	16
7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	17
7A.	Quantitative and Qualitative Disclosures About Market Risk	50
8.	Financial Statements and Supplementary Data	55
9.	Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	138
9A.	Controls and Procedures	138
9B.	Other Information	138
	PART III
10.	Directors, Executive Officers and Corporate Governance	139
11.	Executive Compensation	140
12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	140
13.	Certain Relationships and Related Transactions, and Director Independence	140
14.	Principal Accounting Fees and Services	140
	PART IV
15.	Exhibits, Financial Statement Schedules	141

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PART I

ITEM 1. BUSINESS

CNA Financial Corporation (CNAF) was incorporated in 1967 and is an insurance holding company. References to “CNA,” “the Company,” “we,” “our,” “us” or like terms refer to the business of CNAF and its subsidiaries. CNA's property and casualty and remaining life and group insurance operations are primarily conducted by Continental Casualty Company (CCC), The Continental Insurance Company, Western Surety Company, CNA Insurance Company Limited and Hardy Underwriting Bermuda Limited and its subsidiaries (Hardy). Loews Corporation (Loews) owned approximately 90% of our outstanding common stock as of December 31, 2016.

Our insurance products primarily include commercial property and casualty coverages, including surety. Our services include risk management, information services, warranty and claims administration. Our products and services are primarily marketed through independent agents, brokers and managing general underwriters to a wide variety of customers, including small, medium and large businesses, insurance companies, associations, professionals and other groups.

Our core business, commercial property and casualty insurance operations, is reported in three business segments: Specialty, Commercial and International. Our non-core businesses are reported in two business segments: Life & Group Non-Core and Corporate & Other Non-Core. Each segment is managed separately due to differences in their markets and product mix. Discussion of each segment, including the products offered, customers served and distribution channels used, are set forth in the Management's Discussion and Analysis (MD&A) included under Item 7 and in Note O to the Consolidated Financial Statements included under Item 8.

Competition

The property and casualty insurance industry is highly competitive both as to rate and service. We compete with a large number of stock and mutual insurance companies and other entities for both distributors and customers. Insurers compete on the basis of factors including products, price, services, ratings and financial strength. Accordingly, we must continuously allocate resources to refine and improve our insurance products and services.

There are approximately 2,700 individual companies that sell property and casualty insurance in the United States. Based on 2015 statutory net written premiums, we are the eighth largest commercial insurance writer and the 14^th largest property and casualty insurance organization in the United States.

Regulation

The insurance industry is subject to comprehensive and detailed regulation and supervision. Regulatory oversight by applicable agencies is exercised through review of submitted filings and information, examinations (both financial and market conduct), direct inquiries and interviews. Each domestic and foreign jurisdiction has established supervisory agencies with broad administrative powers relative to licensing insurers and agents, approving policy forms, establishing reserve requirements, prescribing the form and content of statutory financial reports and regulating capital adequacy and the type, quality and amount of investments permitted. Such regulatory powers also extend to premium rate regulations, which require that rates not be excessive, inadequate or unfairly discriminatory, governance requirements and risk assessment practice and disclosure. In addition to regulation of dividends by insurance subsidiaries, intercompany transfers of assets may be subject to prior notice or approval by insurance regulators, depending on the size of such transfers and payments in relation to the financial position of the insurance subsidiaries making the transfer or payment.

Domestic insurers are also required by state insurance regulators to provide coverage to certain insureds who would not otherwise be considered eligible by the insurers. Each state dictates the types of insurance and the level of coverage that must be provided to such involuntary risks. Our share of these involuntary risks is mandatory and generally a function of our respective share of the voluntary market by line of insurance in each state.

Further, domestic insurance companies are subject to state guaranty fund and other insurance-related assessments. Guaranty funds are governed by state insurance guaranty associations which levy assessments to meet the funding needs of insolvent insurer estates. Other insurance-related assessments are generally levied by state agencies to fund various organizations, including disaster relief funds, rating bureaus, insurance departments and workers'

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compensation second injury funds, or by industry organizations that assist in the statistical analysis and ratemaking process, and we have the ability to recoup certain of these assessments from policyholders.

As our insurance operations are conducted in a multitude of both domestic and foreign jurisdictions, we are subject to a number of regulatory agency requirements applicable to a portion, or all, of our operations. These include, among other things, the State of Illinois Department of Insurance (which is our global group-wide supervisor), the U.K. Prudential Regulatory Authority and Financial Conduct Authority, the Bermuda Monetary Authority and the Office of Superintendent of Financial Institutions in Canada.

Hardy, a specialized Lloyd's of London (Lloyd's) underwriter, is also supervised by the Council of Lloyd's, which is the franchisor for all Lloyd's operations. The Council of Lloyd's has wide discretionary powers to regulate Lloyd's underwriting, such as establishing the capital requirements for syndicate participation. In addition, the annual business plans of each syndicate are subject to the review and approval of the Lloyd's Franchise Board, which is responsible for business planning and monitoring for all syndicates.

Capital adequacy and risk management regulations, referred to as Solvency II, apply to our European operations and are enacted by the European Union's executive body, the European Commission. Additionally, the International Association of Insurance Supervisors (IAIS) continues to consider regulatory proposals addressing group supervision, capital requirements and enterprise risk management. The U.S. Federal Reserve, the U.S. Federal Insurance Office and the National Association of Insurance Commissioners are working with other global regulators to define such proposals. It is not currently clear to what extent the IAIS activities will impact the Company as any final proposal would ultimately need to be legislated or regulated by each individual country or state.

Although the U.S. federal government does not currently directly regulate the business of insurance, federal legislative and regulatory initiatives can impact the insurance industry. These initiatives and legislation include proposals relating to potential federal oversight of certain insurers; terrorism and natural catastrophe exposures; cybersecurity risk management; federal financial services reforms; and certain tax reforms.

The Terrorism Risk Insurance Program Reauthorization Act of 2015 provides for a federal government backstop for insured terrorism risks through 2020. The mitigating effect of such law is part of the analysis of our overall risk posture for terrorism and, accordingly, our risk positioning may change if such law were modified. We also continue to invest in the security network of our systems on an enterprise-wide basis, especially considering the implications of data and privacy breaches. This requires an investment of a significant amount of resources by us on an ongoing basis. Potential implications of possible cybersecurity legislation on such current investment, if any, are uncertain. The foregoing laws and proposals, either separately or in the aggregate, create a regulatory and legal environment that may require changes in our business plan or significant investment of resources in order to operate in an effective and compliant manner.

Additionally, various legislative and regulatory efforts to reform the tort liability system have, and will continue to, impact our industry. Although there has been some tort reform with positive impact to the insurance industry, new causes of action and theories of damages continue to be proposed in court actions and by federal and state legislatures that continue to expand liability for insurers and their policyholders.

Employee Relations

As of December 31, 2016, we had approximately 6,700 employees and have experienced satisfactory labor relations. We have never had work stoppages due to labor disputes.

We have comprehensive benefit plans for substantially all of our employees, including retirement plans, savings plans, disability programs, group life programs and group health care programs. See Note I to the Consolidated Financial Statements included under Item 8 for further discussion of our benefit plans.

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Direct Written Premiums by Geographic Concentration

Set forth below is the distribution of our direct written premiums by geographic concentration.

Years ended December 31	Percent of Total
	2016		2015		2014
California	9.5	%	9.1	%	9.1	%
Texas	8.2		8.1		8.1
Illinois	7.6		7.5		6.7
New York	6.9		7.1		7.2
Florida	5.8		5.7		5.7
Pennsylvania	3.7		3.8		3.7
New Jersey	3.1		3.2		3.4
Canada	1.9		2.2		2.6
All other states, countries or political subdivisions	53.3		53.3		53.5
Total	100.0	%	100.0	%	100.0	%

Approximately 7.9%, 8.0% and 8.8% of our direct written premiums were derived from outside of the United States for the years ended December 31, 2016, 2015 and 2014.

Available Information

We file annual, quarterly and current reports, proxy statements and other documents with the Securities and Exchange Commission (SEC) under the Securities Exchange Act of 1934 (Exchange Act). The public may read and copy any materials that we file with the SEC at the SEC's Reading Rooms at 100 F Street NE, Washington, D.C. 20549. The public may obtain information on the operation of the Reading Rooms by calling the SEC at 1-202-551-8090. The SEC also maintains an internet site that contains reports, proxy and information statements and other information regarding issuers, including CNA, that file electronically with the SEC. The public can obtain any documents that we file with the SEC at www.sec.gov.

We also make available free of charge on or through our internet website at www.cna.com our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. Copies of these reports may also be obtained, free of charge, upon written request to: CNA Financial Corporation, 333 S. Wabash Avenue, Chicago, IL 60604, Attn: Jonathan D. Kantor, Executive Vice President, General Counsel and Secretary.

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ITEM 1A. RISK FACTORS

Our business faces many risks and uncertainties. These risks and uncertainties could lead to events or circumstances that have a material adverse effect on our results of operations, equity, business and insurer financial strength and corporate debt ratings. We have described below the most significant risks facing us. There may be additional risks that we do not yet know of or that we do not currently perceive to be as significant that may also impact our business. You should carefully consider and evaluate all of the information included in this report and any subsequent reports we may file with the SEC or make available to the public before investing in any securities we issue.

If we determine that our recorded insurance reserves are insufficient to cover our estimated ultimate unpaid liability for claim and claim adjustment expenses, we may need to increase our insurance reserves which would result in a charge to our earnings.

We maintain insurance reserves to cover our estimated ultimate unpaid liability for claim and claim adjustment expenses, including the estimated cost of the claims adjudication process, for reported and unreported claims. Insurance reserves are not an exact calculation of liability but instead are complex management estimates developed utilizing a variety of actuarial reserve estimation techniques as of a given reporting date. The reserve estimation process involves a high degree of judgment and variability and is subject to a number of factors which are highly uncertain. These variables can be affected by both changes in internal processes and external events. Key variables include claims severity, frequency of claims, mortality, morbidity, discount rates, inflation, claims handling policies and procedures, case reserving approach, underwriting and pricing policies, changes in the legal and regulatory environment and the lag time between the occurrence of an insured event and the time of its ultimate settlement. Mortality is the relative incidence of death. Morbidity is the frequency and severity of injury, illness, sickness and diseases contracted.

There is generally a higher degree of variability in estimating required reserves for long-tail coverages, such as general liability and workers' compensation, as they require a relatively longer period of time for claims to be reported and settled. The impact of changes in inflation and medical costs are also more pronounced for long-tail coverages due to the longer settlement period.

We are subject to the uncertain effects of emerging or potential claims and coverage issues that arise as industry practices and legal, judicial, social, economic and other environmental conditions change. These issues have had, and may continue to have, a negative effect on our business by either extending coverage beyond the original underwriting intent or by increasing the number or size of claims, resulting in further increases in our reserves. The effects of unforeseen emerging claim and coverage issues are extremely difficult to predict.

Emerging or potential claims and coverage issues include, but are not limited to, uncertainty in future medical costs in workers' compensation. In particular, medical cost inflation could be greater than expected due to new treatments, drugs and devices; increased healthcare utilization; and/or the future costs of healthcare facilities. In addition, the relationship between workers' compensation and government and private healthcare providers could change, potentially shifting costs to workers' compensation.

In light of the many uncertainties associated with establishing the estimates and making the judgments necessary to establish reserve levels, we continually review and change our reserve estimates in a regular and ongoing process as experience develops from the actual reporting and settlement of claims and as the legal, regulatory and economic environment evolves. If our recorded reserves are insufficient for any reason, the required increase in reserves would be recorded as a charge against our earnings in the period in which reserves are determined to be insufficient. These charges could be substantial.

Our actual experience could vary from the key assumptions used to determine active life reserves for long term care policies.

Our active life reserves for long term care policies are based on our best estimate assumptions as of December 31, 2015, due to an unlocking at that date. Key assumptions include morbidity, persistency (the percentage of policies remaining in force), discount rate and future premium rate increases. These assumptions, which are critical bases for our reserve estimates, are inherently uncertain. If actual experience varies from these assumptions or the future outlook for these assumptions changes, we may be required to increase our reserves. See the Life & Group Non-

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Core Policyholder Reserves portion of Reserves - Estimates and Uncertainties section of MD&A in Item 7 for more information.

Estimating future experience for long term care policies is highly uncertain, because the required projection period is very long and there is limited historical and industry data available to us, as only a small portion of the long term care policies which have been written to date are in claims paying status. Morbidity and persistency trends can be volatile and may be negatively affected by many factors including, but not limited to, policyholder behavior, judicial decisions regarding policy terms, socioeconomic factors, cost of care inflation, changes in health trends and advances in medical care.

A prolonged period during which interest rates remain at levels lower than those anticipated in our reserving would result in shortfalls in investment income on assets supporting our obligations under long term care policies, which may require changes to our reserves. This risk is more significant for our long term care products because the long potential duration of the policy obligations exceeds the duration of the supporting investment assets. Further, changes to the corporate tax code may also impact the rate at which we discount our reserves. In addition, we may not receive regulatory approval for the level of premium rate increases we request. Any adverse deviation between the level of future premium rate increases approved and the level included in our reserving assumptions may require an increase to our reserves.

If our estimated reserves are insufficient for any reason, including changes in assumptions, the required increase in reserves would be recorded as a charge against our earnings in the period in which reserves are determined to be insufficient. These charges could be substantial.

Catastrophe losses are unpredictable and could result in material losses.

Catastrophe losses are an inevitable part of our business. Various events can cause catastrophe losses. These events can be natural or man-made, and may include hurricanes, windstorms, earthquakes, hail, severe winter weather, fires, floods, riots, strikes, civil commotion and acts of terrorism. The frequency and severity of these catastrophe events are inherently unpredictable. In addition, longer-term natural catastrophe trends may be changing and new types of catastrophe losses may be developing due to climate change, a phenomenon that has been associated with extreme weather events linked to rising temperatures and includes effects on global weather patterns, greenhouse gases, sea, land and air temperatures, sea levels, rain, hail and snow.

The extent of our losses from catastrophes is a function of the total amount of our insured exposures in the affected areas, the frequency and severity of the events themselves, the level of reinsurance assumed and ceded, reinsurance reinstatement premiums and state residual market assessments, if any. It can take a long time for the ultimate cost of any catastrophe losses to us to be finally determined, as a multitude of factors contribute to such costs, including evaluation of general liability and pollution exposures, infrastructure disruption, business interruption and reinsurance collectibility. Reinsurance coverage for terrorism events is provided only in limited circumstances, especially in regard to “unconventional” terrorism acts, such as nuclear, biological, chemical or radiological attacks. As a result of the items discussed above, catastrophe losses are particularly difficult to estimate.

Additionally, claim frequency and severity for some lines of business can be correlated to an external factor such as economic activity, financial market volatility, increasing health care costs or changes in the legal or regulatory environment. Claim frequency and severity can also be correlated to insureds' use of common business practices, equipment, vendors or software. This can result in multiple insured losses emanating out of the same underlying cause. In these instances, we may be subject to increased claim frequency and severity across multiple policies or lines of business concurrently. While we do not define such instances as catastrophes for financial reporting purposes, they are similar to catastrophes in terms of the uncertainty and potential impact on our results.

We have exposures related to asbestos and environmental pollution (A&EP) claims, which could result in material losses.

Our property and casualty insurance subsidiaries have exposures related to A&EP claims. Our experience has been that establishing claim and claim adjustment expense reserves for casualty coverages relating to A&EP claims is subject to uncertainties that are greater than those presented by other claims. Additionally, traditional actuarial methods and techniques employed to estimate the ultimate cost of claims for more traditional property and casualty exposures are less precise in estimating claim and claim adjustment expense reserves for A&EP. As a result,

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estimating the ultimate cost of both reported and unreported A&EP claims is subject to a higher degree of variability. On August 31, 2010, we completed a retroactive reinsurance transaction under which substantially all of our legacy A&EP liabilities were ceded to National Indemnity Company (NICO), a subsidiary of Berkshire Hathaway Inc., subject to an aggregate limit of $4 billion (Loss Portfolio Transfer). The cumulative amount ceded under the Loss Portfolio Transfer as of December 31, 2016 is $2.8 billion. If the other parties to the Loss Portfolio Transfer do not fully perform their obligations, net losses incurred on A&EP claims covered by the Loss Portfolio Transfer exceed the aggregate limit of $4 billion, or we determine we have exposures to A&EP claims not covered by the Loss Portfolio Transfer, we may need to increase our recorded net reserves which would result in a charge against our earnings. These charges could be substantial.

We use analytical models to assist our decision making in key areas such as pricing, reserving and capital modeling and may be adversely affected if actual results differ materially from the model outputs and related analyses.

We use various modeling techniques and data analytics (e.g., scenarios, predictive, stochastic and/or forecasting) to analyze and estimate exposures, loss trends and other risks associated with our assets and liabilities. This includes both proprietary and third party modeled outputs and related analyses to assist us in decision-making related to underwriting, pricing, capital allocation, reserving, investing, reinsurance and catastrophe risk, among other things. We incorporate numerous assumptions and forecasts about the future level and variability of policyholder behavior, loss frequency and severity, interest rates, equity markets, inflation, capital requirements, and currency exchange rates, among others. The modeled outputs and related analyses from both proprietary and third parties are subject to the inherent limitations of any statistical analysis, including those arising from the use of historical internal and industry data and assumptions.

In addition, the effectiveness of any model can be degraded by operational risks including, but not limited to, the improper use of the model, including input errors, data errors and human error. As a result, actual results may differ materially from our modeled results. The profitability and financial condition of the Company substantially depends on the extent to which our actual experience is consistent with assumptions we use in our models and ultimate model outputs. If, based upon these models or other factors, we misprice our products or fail to appropriately estimate the risks we are exposed to, our business, financial condition, results of operations or liquidity may be adversely affected.

We face intense competition in our industry; we may be adversely affected by the cyclical nature of the property and casualty business, the evolving landscape of our distribution network, as well as the availability and cost of reinsurance.

All aspects of the insurance industry are highly competitive and we must continuously allocate resources to refine and improve our insurance products and services to remain competitive. We compete with a large number of stock and mutual insurance companies and other entities, some of which may be larger or have greater financial or other resources than we do, for both distributors and customers. This includes agents and brokers who may increasingly compete with us to the extent that markets continue to provide them with direct access to providers of capital seeking exposure to insurance risk. Insurers compete on the basis of many factors, including products, price, services, ratings and financial strength. The competitor insurer landscape has evolved substantially in recent years, with significant consolidation and new market entrants, resulting in increased pressures on our ability to remain competitive, particularly in implementing pricing that is both attractive to our customer base and risk-appropriate to the Company.

In addition, the property and casualty market is cyclical and has experienced periods characterized by relatively high levels of price competition, resulting in less restrictive underwriting standards and relatively low premium rates, followed by periods of relatively lower levels of competition, more selective underwriting standards and relatively high premium rates. During periods in which price competition is high, we may lose business to competitors offering competitive insurance products at lower prices. As a result, our premium levels and expense ratio could be materially adversely impacted.

We market our insurance products worldwide primarily through independent insurance agents and insurance brokers, who also promote and distribute the products of our competitors. Any change in our relationships with our distribution network agents and brokers, including as a result of consolidation and their increased promotion

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and distribution of our competitors' products, could adversely affect our ability to sell our products. As a result, our business volume and results of operations could be materially adversely impacted.

We purchase reinsurance to help manage our exposure to risk. Under our ceded reinsurance arrangements, another insurer assumes a specified portion of our exposure in exchange for a specified portion of policy premiums. Market conditions determine the availability and cost of the reinsurance protection we purchase, which affects the level of our business and profitability, as well as the level and types of risk we retain. If we are unable to obtain sufficient reinsurance at a cost we deem acceptable, we may be unwilling to bear the increased risk and would reduce the level of our underwriting commitments.

We may be adversely affected by technological changes or disruptions in the insurance marketplace.

Technological changes in the way insurance transactions are completed in the marketplace, and our ability to react effectively to such change, may present significant competitive risks. For example, more insurers are utilizing "big data" analytics to make underwriting and other decisions that impact product design and pricing. If such utilization is more effective than how we use similar data and information, we will be at a competitive disadvantage. There can be no assurance that we will continue to compete effectively with our industry peers due to technological changes; accordingly, this may have a material adverse effect on our business and results of operations.

In addition, agents and brokers, technology companies, or other third parties may create alternate distribution channels for commercial business that may adversely impact product differentiation and pricing. For example, they may create a digitally enabled distribution channel that may adversely impact our competitive position. Our efforts or the efforts of agents and brokers with respect to new products or alternate distribution channels, as well as changes in the way agents and brokers utilize greater levels of data and technology, could adversely impact our business relationship with independent agents and brokers who currently market our products, resulting in a lower volume and/or profitability of business generated from these sources.

We may not be able to collect amounts owed to us by reinsurers, which could result in higher net incurred losses.

We have significant amounts recoverable from reinsurers which are reported as receivables on our Consolidated Balance Sheets and are estimated in a manner consistent with claim and claim adjustment expense reserves or future policy benefits reserves. The ceding of insurance does not, however, discharge our primary liability for claims. As a result, we are subject to credit risk relating to our ability to recover amounts due from reinsurers. Certain of our reinsurance carriers have experienced credit downgrades by rating agencies within the term of our contractual relationship, which indicates an increase in the likelihood that we will not be able to recover amounts due. In addition, reinsurers could dispute amounts which we believe are due to us. If the amounts due from reinsurers that we are able to collect are less than the amount recorded by us with respect to such amounts due, our net incurred losses will be higher.

We may not be able to collect amounts owed to us by policyholders who hold deductible policies and/or who purchase retrospectively rated policies, which could result in higher net incurred losses.

A portion of our business is written under deductible policies. Under these policies, we are obligated to pay the related insurance claims and are reimbursed by the policyholder to the extent of the deductible, which may be significant.

Moreover, certain policyholders purchase retrospectively rated workers' compensation policies (i.e., policies in which premiums are adjusted after the policy period based on the actual loss experience of the policyholder during the policy period). Retrospectively rated policies expose us to additional credit risk to the extent that the adjusted premium is greater than the original premium, which may be significant. As a result, we are exposed to policyholder credit risk. If the amounts due from policyholders that we are able to collect are less than the amounts recorded with respect to such amounts due, our incurred losses will be higher.

We may incur significant realized and unrealized investment losses and volatility in net investment income arising from changes in the financial markets.

Our investment portfolio is exposed to various risks, such as interest rate, credit spread, issuer default, equity prices and foreign currency, which are unpredictable. Financial markets are highly sensitive to changes in economic

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conditions, monetary policies, tax policies, domestic and international geopolitical issues and many other factors. Changes in financial markets including fluctuations in interest rates, credit, equity prices and foreign currency prices and many other factors beyond our control can adversely affect the value of our investments, the realization of investment income and the rate at which we discount certain liabilities.

We have significant holdings in fixed maturity investments that are sensitive to changes in interest rates. A decline in interest rates may reduce the returns earned on new fixed maturity investments, thereby reducing our net investment income, while an increase in interest rates may reduce the value of our existing fixed maturity investments. The value of our fixed maturity investments is also subject to risk that certain investments may default or become impaired due to deterioration in the financial condition of issuers of the investments we hold or in the underlying collateral of the security. Any such impairments which we deem to be other-than-temporary would result in a charge to our earnings.

In addition, we invest a portion of our assets in equity securities and limited partnerships which are subject to greater market volatility than our fixed maturity investments. Limited partnership investments generally provide a lower level of liquidity than fixed maturity or equity investments which may also limit our ability to withdraw assets.

Further, we hold a portfolio of commercial mortgage loans. We are subject to credit risk relating to our ability to recover amounts due from the borrowers as a result of the creditworthiness of the borrowers or tenants of credit tenant loan properties. If the amounts we collect from the borrowers are less than the amount recorded, it would result in a charge to our earnings.

As a result of all of these factors, we may not earn an adequate return on our investments, may be required to write down the value of our investments and may incur losses on the disposition of our investments.

Changes in tax laws of jurisdictions in which we operate could adversely impact our results of operations.

Federal, state or foreign tax legislation that would lessen or eliminate some or all of the tax attributes currently affecting us could materially and adversely impact our results of operations, in particular, changes to tax laws governing tax credits. Other potential tax law changes, including modification of the corporate tax rate and the taxation of interest from municipal bonds, could also adversely affect the value of the tax benefit received on tax exempt municipal investments and thus the rate at which we discount our long term care active life reserves.

Any significant interruption in the operation of our facilities, systems and business functions or breach in our data security infrastructure could result in a materially adverse effect on our operations.

Our business is highly dependent upon our ability to perform, in an efficient and uninterrupted manner, through our employees or vendor relationships, necessary business functions (such as internet support and 24-hour call centers), processing new and renewal business and processing and paying claims and other obligations. Our facilities and systems could become unavailable, inoperable, or otherwise impaired from a variety of causes, including, without limitation, natural events, such as hurricanes, tornadoes, windstorms, earthquakes, severe winter weather and fires, or other events, such as explosions, terrorist attacks, computer security breaches or cyber attacks, riots, hazardous material releases, medical epidemics, utility outages, interruptions of our data processing and storage systems or the systems of third-party vendors, or unavailability of communications facilities. Likewise, we could experience a significant failure or corruption of one or more of our information technology, telecommunications, or other systems for various reasons, including significant failures that might occur as existing systems are replaced or upgraded.

The shut-down or unavailability of one or more of our systems or facilities for any reason could significantly impair our ability to perform critical business functions on a timely basis. In addition, because our information technology and telecommunications systems interface with and depend on third-party systems, we could experience service denials if demand for such service exceeds capacity or a third-party system fails or experiences an interruption. If sustained or repeated, such events could result in a deterioration of our ability to write and process new and renewal business, provide customer service, pay claims in a timely manner, or perform other necessary business functions, including the ability to issue financial statements in a timely manner. This could result in a materially adverse effect on our business results, prospects and liquidity, as well as damage to customer goodwill.

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A significant breach of our data security infrastructure, resulting from actions by our employees, vendors, third-party administrators or by unknown third parties, that impacts our data framework or causes a failure to protect personal information of our customers, claimants or employees may result in operational impairments and financial losses, as well as significant harm to our reputation.

The foregoing risks relating to disruption of service, interruption of operations and data loss could expose us to monetary and reputational damages. In addition, potential exposures include substantially increased compliance costs and required computer system upgrades and security-related investments. The breach of confidential information also could give rise to legal liability and regulatory action under data protection and privacy laws and regulations, both in the U.S. and foreign jurisdictions. Any such legal or regulatory action could have a material adverse effect on our operations.

Inability to detect and prevent significant employee or third party service provider misconduct or inadvertent errors and omissions could result in a materially adverse effect on our operations.

We may incur losses which arise from employees or third party service providers engaging in intentional misconduct, fraud, errors and omissions, failure to comply with internal guidelines, including with respect to underwriting authority, or failure to comply with regulatory requirements. Our controls may not be able to detect all possible circumstances of employee and third party service provider non-compliant activity and the internal structures in place to prevent this activity may not be effective in all cases. Any losses relating to such non-compliant activity could adversely affect our results of operations.

Loss of key vendor relationships, issues relating to the transitioning of vendor relationships or exposure relating to functions performed by a vendor could result in a materially adverse effect on our operations.

In the event that one or more of our vendors suffers a bankruptcy, is sold to another entity, sustains a significant business interruption or otherwise becomes unable to continue to provide products or services at the requisite level, we may be adversely affected. We may suffer operational impairments and financial losses associated with transferring business to a new vendor, assisting a vendor with rectifying operational difficulties, failure by vendors to properly perform service functions or assuming previously outsourced operations ourselves. Our inability to provide for appropriate servicing if a vendor becomes unable to fulfill its contractual obligations to us, either through transitioning to another service provider temporarily or permanently or assuming servicing internally, may have a materially adverse effect on our operations.

Additionally, we rely on certain third-party claims administrators, including the administrators of our long term care claims, to perform significant claim administration and claim adjudication functions. Any failure by such administrator to properly perform service functions may result in losses as a result of over-payment of claims, legal claims against us and adverse regulatory enforcement exposure.

We face considerable competition within our industry for qualified, specialized talent and any significant inability to attract and retain talent may adversely affect the execution of our business strategies.

The successful execution of our business plan depends on our ability to attract and retain qualified talent. Due to the intense competition in our industry for qualified employees with specialized industry experience, we may encounter obstacles to our ability to attract and retain such employees, which could adversely impact our results of operations.

We are subject to capital adequacy requirements and, if we are unable to maintain or raise sufficient capital to meet these requirements, regulatory agencies may restrict or prohibit us from operating our business.

Insurance companies such as ours are subject to capital adequacy standards set by regulators to help identify companies that merit further regulatory attention. These standards apply specified risk factors to various asset, premium and reserve components of our legal entity statutory basis of accounting financial statements. Current rules, including those promulgated by insurance regulators and specialized markets, such as Lloyd's, require companies to maintain statutory capital and surplus at a specified minimum level determined using the applicable jurisdiction's regulatory capital adequacy formula. If we do not meet these minimum requirements, we may be restricted or prohibited from operating our business in the applicable jurisdictions and specialized markets. If we are required to record a material charge against earnings in connection with a change in estimated insurance reserves, the occurrence of a catastrophic event, or if we incur significant losses related to our investment portfolio, which

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severely deteriorate our capital position, we may violate these minimum capital adequacy requirements unless we are able to raise sufficient additional capital. We may be limited in our ability to raise significant amounts of capital on favorable terms or at all.

Globally, insurance regulators are working cooperatively to develop a common framework for the supervision of internationally active insurance groups. Finalization and adoption of this framework could increase our minimum regulatory capital requirement as well as significantly increase our cost of regulatory compliance.

Our insurance subsidiaries, upon whom we depend for dividends in order to fund our corporate obligations, are limited by insurance regulators in their ability to pay dividends.

We are a holding company and are dependent upon dividends, loans and other sources of cash from our subsidiaries in order to meet our obligations. Ordinary dividend payments, or dividends that do not require prior approval by the insurance subsidiaries' domiciliary insurance regulator, are generally limited to amounts determined by formulas that vary by jurisdiction. If we are restricted from paying or receiving intercompany dividends, by regulatory rule or otherwise, we may not be able to fund our corporate obligations and debt service requirements from available cash. As a result, we would need to look to other sources of capital which may be more expensive or may not be available at all.

Rating agencies may downgrade their ratings of us and thereby adversely affect our ability to write insurance at competitive rates or at all.

Ratings are an important factor in establishing the competitive position of insurance companies. Our insurance company subsidiaries, as well as our public debt, are rated by rating agencies, including, A.M. Best Company (A.M. Best), Moody's Investors Service, Inc. (Moody's) and Standard & Poor's (S&P). Ratings reflect the rating agency's opinions of an insurance company's or insurance holding company's financial strength, capital adequacy, operating performance, strategic position and ability to meet its obligations to policyholders and debt holders.

The rating agencies may take action to lower our ratings in the future as a result of any significant financial loss or possible changes in the methodology or criteria applied by the rating agencies. The severity of the impact on our business is dependent on the level of downgrade and, for certain products, which rating agency takes the rating action. Among the adverse effects in the event of such downgrades would be the inability to obtain a material volume of business from certain major insurance brokers, the inability to sell a material volume of our insurance products to certain markets and the required collateralization of certain future payment obligations or reserves.

In addition, it is possible that a significant lowering of the corporate debt ratings of Loews by certain of the rating agencies could result in an adverse impact on our ratings, independent of any change in our circumstances.

We are subject to extensive existing state, local, federal and foreign governmental regulations that restrict our ability to do business and generate revenues; additional regulation or significant modification to existing regulations or failure to comply with regulatory requirements may have a materially adverse effect on our business, our operations and financial condition.

The insurance industry is subject to comprehensive and detailed regulation and supervision. Most insurance regulations are designed to protect the interests of our policyholders and third-party claimants, rather than our investors. Each jurisdiction in which we do business has established supervisory agencies that regulate the manner in which we do business. Any changes in regulation could also impose significant burdens on us. In addition, the Lloyd's marketplace sets rules under which its members, including our Hardy syndicate, operate.

These rules and regulations relate to, among other things, the standards of solvency (including risk-based capital measures), government-supported backstops for certain catastrophic events (including terrorism), investment restrictions, accounting and reporting methodology, establishment of reserves and potential assessments of funds to settle covered claims against impaired, insolvent or failed private or quasi-governmental insurers.

Regulatory powers also extend to premium rate regulations which require that rates not be excessive, inadequate or unfairly discriminatory. State jurisdictions ensure compliance with such regulations through market conduct exams, which may result in losses to the extent non-compliance is ascertained, either as a result of failure to document transactions properly or failure to comply with internal guidelines, or otherwise. The jurisdictions in which we do business may also require us to provide coverage to persons whom we would not otherwise consider

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eligible or restrict us from withdrawing from unprofitable lines of business or unprofitable market areas. Each jurisdiction dictates the types of insurance and the level of coverage that must be provided to such involuntary risks. Our share of these involuntary risks is mandatory and generally a function of our respective share of the voluntary market by line of insurance in each jurisdiction.

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ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 2. PROPERTIES

Our Chicago location houses our principal executive offices. We lease office space in various cities throughout the United States and in other countries. The following table sets forth certain information with respect to our principal office locations.

Location	Amount (Square Feet) of Space Leased and Occupied by CNA	Principal Usage
333 S. Wabash Avenue, Chicago, Illinois	602,483	Principal executive offices of CNAF
2405 Lucien Way, Maitland, Florida	108,062	Property and casualty insurance offices
125 S. Broad Street, New York, New York	66,810	Property and casualty insurance offices
1 Meridian Boulevard, Wyomissing, Pennsylvania	59,161	Property and casualty insurance offices
101 S. Reid Street, Sioux Falls, South Dakota	58,917	Property and casualty insurance offices
4150 N. Drinkwater Boulevard, Scottsdale, Arizona	56,281	Property and casualty insurance offices
700 N. Pearl Street, Dallas, Texas	35,316	Property and casualty insurance offices
1249 S. River Road, Cranbury, New Jersey	34,666	Property and casualty insurance offices
555 Mission Street, San Francisco, California	32,892	Property and casualty insurance offices
10375 Park Meadows Drive, Littleton, Colorado	28,589	Property and casualty insurance offices

We lease all of the office space described above, including the building in Chicago, Illinois, which was sold by CCC during the first quarter of 2016. We consider our properties to be in generally good condition, well maintained and suitable and adequate to carry on our business.

ITEM 3. LEGAL PROCEEDINGS

Information on our legal proceedings is set forth in Note F to the Consolidated Financial Statements included under Item 8.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

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PART II

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

Our common stock is listed on the New York Stock Exchange and the Chicago Stock Exchange under the symbol CNA.

As of February 10, 2017, we had 270,621,400 shares of common stock outstanding and approximately 90% of our outstanding common stock was owned by Loews. We had 1,042 stockholders of record as of February 10, 2017 according to the records maintained by our transfer agent.

Our Board of Directors has approved an authorization to purchase, in the open market or through privately negotiated transactions, our outstanding common stock, as our management deems appropriate. No repurchases were made in 2016 or 2015.

The table below shows the high and low closing prices for our common stock based on the New York Stock Exchange Composite Transactions, as well as the dividends declared on our common stock.

	2016						2015
Quarter:	High		Low		Dividends Declared		High		Low		Dividends Declared
First	$	34.60	$	28.21	$	2.25	$	43.40	$	36.61	$	2.25
Second	33.07		29.42		0.25		41.82		37.91		0.25
Third	34.86		30.37		0.25		40.43		34.29		0.25
Fourth	42.07		34.04		0.25		37.05		34.24		0.25

The following graph compares the five-year total return of our common stock, the Standard & Poor's 500 (S&P 500) Index and the S&P 500 Property & Casualty Insurance Index. The graph assumes that the value of the investment in our common stock and each index was $100 at the base period, January 1, 2012, and that dividends, if any, were reinvested.

Company / Index	Base Period		2012		2013		2014		2015		2016
CNA Financial Corporation	$	100.00	$	107.00	$	167.58	$	158.80	$	155.04	$	201.57
S&P 500 Index	100.00		116.00		153.57		174.60		177.01		198.18
S&P 500 Property & Casualty Insurance Index	100.00		120.11		166.10		192.25		210.57		243.65

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ITEM 6. SELECTED FINANCIAL DATA

The following table presents selected financial data. On July 2, 2012, we acquired Hardy. The results of Hardy are included from the date of acquisition. The table should be read in conjunction with Item 7 Management's Discussion and Analysis of Financial Condition and Results of Operations and Item 8 Financial Statements and Supplementary Data of this Form 10-K. The comparative period Financial Condition data through 2013 includes CAC assets and liabilities.

As of or for the years ended December 31
(In millions, except per share data)	2016		2015		2014			2013		2012
Results of Operations:
Revenues	$	9,366	$	9,101	$	9,692		$	9,932	$	9,364
Income (loss) from continuing operations, net of tax	$	859	$	479	$	888		$	915	$	620
(Loss) income from discontinued operations, net of tax	—		—		(197		)	22		8
Net income (loss) attributable to CNA	$	859	$	479	$	691		$	937	$	628
Basic Earnings (Loss) Per Share:
Income (loss) from continuing operations	$	3.18	$	1.77	$	3.29		$	3.39	$	2.30
(Loss) income from discontinued operations	—		—		(0.73		)	0.09		0.03
Basic earnings (loss) per share	$	3.18	$	1.77	$	2.56		$	3.48	$	2.33
Diluted Earnings (Loss) Per Share:
Income (loss) from continuing operations	$	3.17	$	1.77	$	3.28		$	3.39	$	2.30
(Loss) income from discontinued operations	—		—		(0.73		)	0.08		0.03
Diluted earnings (loss) per share	$	3.17	$	1.77	$	2.55		$	3.47	$	2.33
Dividends declared per common share	$	3.00	$	3.00	$	2.00		$	0.80	$	0.60
Financial Condition:
Total investments	$	45,420	$	44,699	$	46,262		$	46,107	$	47,636
Total assets	55,233		55,045		55,564			57,192		58,520
Insurance reserves	36,431		36,486		36,380			38,394		40,005
Long and short term debt	2,710		2,560		2,557			2,558		2,568
Total CNA stockholders' equity	11,969		11,756		12,794			12,651		12,314
Book value per common share	$	44.25	$	43.49	$	47.39		$	46.91	$	45.71

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

Index to this MD&A

Management's discussion and analysis of financial condition and results of operations is comprised of the following sections:

	Page No.
Overview	18
Critical Accounting Estimates	18
Reserves - Estimates and Uncertainties	21
Consolidated Operations	27
Segment Results	29
Specialty	30
Commercial	33
International	35
Life & Group Non-Core	38
Corporate & Other Non-Core	40
Investments	41
Net Investment Income	41
Net Realized Investment Gains (Losses)	42
Portfolio Quality	43
Duration	44
Short Term Investments	44
Liquidity and Capital Resources	45
Cash Flows	45
Liquidity	45
Common Stock Dividends	46
Commitments, Contingencies and Guarantees	46
Ratings	47
Accounting Standards Updates	48
Forward-Looking Statements	48

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OVERVIEW

The following discussion should be read in conjunction with Item 1A Risk Factors, Item 6 Selected Financial Data and Item 8 Financial Statements and Supplementary Data of this Form 10-K.

CRITICAL ACCOUNTING ESTIMATES

The preparation of Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America (GAAP) requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the amount of revenues and expenses reported during the period. Actual results may differ from those estimates.

Our Consolidated Financial Statements and accompanying notes have been prepared in accordance with GAAP applied on a consistent basis. We continually evaluate the accounting policies and estimates used to prepare the Consolidated Financial Statements. In general, our estimates are based on historical experience, evaluation of current trends, information from third-party professionals and various other assumptions that are believed to be reasonable under the known facts and circumstances.

The accounting estimates discussed below are considered by us to be critical to an understanding of our Consolidated Financial Statements as their application places the most significant demands on our judgment. Note A to the Consolidated Financial Statements included under Item 8 should be read in conjunction with this section to assist with obtaining an understanding of the underlying accounting policies related to these estimates. Due to the inherent uncertainties involved with these types of judgments, actual results could differ significantly from estimates and may have a material adverse impact on our results of operations, equity, business, and insurer financial strength and corporate debt ratings.

Insurance Reserves

Insurance reserves are established for both short and long-duration insurance contracts. Short-duration contracts are primarily related to property and casualty insurance policies where the reserving process is based on actuarial estimates of the amount of loss, including amounts for known and unknown claims. Long-duration contracts are primarily related to long term care policies and are estimated using actuarial estimates about morbidity and persistency as well as assumptions about expected investment returns and future premium rate increases. The reserve for unearned premiums on property and casualty contracts represents the portion of premiums written related to the unexpired terms of coverage. The reserving process is discussed in further detail in the Reserves-Estimates and Uncertainties section below.

Reinsurance and Insurance Receivables

Exposure exists with respect to the collectibility of ceded property and casualty and life reinsurance to the extent that any reinsurer is unable to meet its obligations or disputes the liabilities we have ceded under reinsurance agreements. An allowance for uncollectible reinsurance is recorded on the basis of periodic evaluations of balances due from reinsurers, reinsurer solvency, our past experience and current economic conditions. Further information on our reinsurance receivables is in Note G to the Consolidated Financial Statements included under Item 8.

Additionally, exposure exists with respect to the collectibility of amounts due from policyholders related to insurance contracts, including amounts due from insureds under high deductible policies and retrospectively rated policies. An allowance for uncollectible insurance receivables is recorded on the basis of periodic evaluations of balances due from insureds, currently as well as in the future, management's experience and current economic conditions.

If actual experience differs from the estimates made by management in determining the allowances for uncollectible reinsurance and insurance receivables, net receivables as reflected on our Consolidated Balance Sheets may not be collected. Therefore, our results of operations or equity could be materially adversely affected.

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Valuation of Investments and Impairment of Securities

We classify our fixed maturity securities and equity securities as either available-for-sale or trading, which are both carried at fair value on the balance sheet. Fair value represents the price that would be received in a sale of an asset in an orderly transaction between market participants on the measurement date, the determination of which requires us to make a significant number of assumptions and judgments. Securities with the greatest level of subjectivity around valuation are those that rely on inputs that are significant to the estimated fair value and that are not observable in the market or cannot be derived principally from or corroborated by observable market data. These unobservable inputs are based on assumptions consistent with what we believe other market participants would use to price such securities. Further information on our fair value measurements is in Note C to the Consolidated Financial Statements included under Item 8.

Our investment portfolio is subject to market declines below amortized cost that may be other-than-temporary and therefore result in the recognition of impairment losses in earnings. Factors considered in the determination of whether or not a decline is other-than-temporary include a current intention or need to sell the security or an indication that a credit loss exists. Significant judgment exists regarding the evaluation of the financial condition and expected near-term and long-term prospects of the issuer, the relevant industry conditions and trends and whether we expect to receive cash flows sufficient to recover the entire amortized cost basis of the security. Further information on our process for evaluating impairments is in Note A to the Consolidated Financial Statements included under Item 8.

Long Term Care Policies

Future policy benefits reserves for our long term care policies are based on certain assumptions, including morbidity, persistency, discount rates and future premium rate increases. The adequacy of the reserves is contingent upon actual experience and our future expectations related to these key assumptions. If actual or expected future experience differs from these assumptions, the reserves may not be adequate, requiring us to add to reserves.

A prolonged period during which interest rates remain at levels lower than those anticipated in our reserving discount rate assumption could result in shortfalls in investment income on assets supporting our obligations under long term care policies, which may also require an increase to our reserves. In addition, we may not receive regulatory approval for the premium rate increases we request.

These changes to our reserves could materially adversely impact our results of operations and equity. The reserving process is discussed in further detail in the Reserves - Estimates and Uncertainties section below.

Pension and Postretirement Benefit Obligations

We make a significant number of assumptions in estimating the liabilities and costs related to our pension and postretirement benefit obligations. The assumptions that most affect these costs are the discount rate and the expected long term rate of return on plan assets. These assumptions are based on, among other things, current economic factors such as inflation, interest rates and broader capital market expectations. Changes in these assumptions can have a material impact on pension obligations and pension expense.

To determine the discount rate assumption as of the year-end measurement date for our CNA Retirement Plan and CNA Health and Group Benefits Program, we considered the estimated timing of plan benefit payments and available yields on high quality fixed income debt securities. For this purpose, high quality is considered a rating of Aa or better by Moody's or a rating of AA or better from S&P. We reviewed several yield curves constructed using the cash flow characteristics of the plans as well as bond indices as of the measurement date. The trend of those data points was also considered.

In determining the expected long term rate of return on plan assets assumption for our CNA Retirement Plan, we considered the historical performance of the investment portfolio as well as the long term market return expectations based on the investment mix of the portfolio and the expected investment horizon.

Further information on our pension and postretirement benefit obligations is in Note I to the Consolidated Financial Statements included under Item 8.

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Income Taxes

We account for income taxes under the asset and liability method. Under this method, deferred income taxes are recognized for temporary differences between the financial statement and tax return basis of assets and liabilities. Any resulting future tax benefits are recognized to the extent that realization of such benefits is more likely than not, and a valuation allowance is established for any portion of a deferred tax asset that management believes will not be realized. The assessment of the need for a valuation allowance requires management to make estimates and assumptions about future earnings, reversal of existing temporary differences and available tax planning strategies. If actual experience differs from these estimates and assumptions, the recorded deferred tax asset may not be fully realized resulting in an increase to income tax expense in our results of operations. In addition, the ability to record deferred tax assets in the future could be limited, resulting in a higher effective tax rate in that future period.

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RESERVES - ESTIMATES AND UNCERTAINTIES

The level of reserves we maintain represents our best estimate, as of a particular point in time, of what the ultimate settlement and administration of claims will cost based on our assessment of facts and circumstances known at that time. Reserves are not an exact calculation of liability but instead are complex estimates that we derive, generally utilizing a variety of actuarial reserve estimation techniques, from numerous assumptions and expectations about future events, both internal and external, many of which are highly uncertain. As noted below, we review our reserves for each segment of our business periodically, and any such review could result in the need to increase reserves in amounts which could be material and could adversely affect our results of operations, equity, business and insurer financial strength and corporate debt ratings. Further information on reserves is provided in Note E to the Consolidated Financial Statements included under Item 8.

Property and Casualty Claim and Claim Adjustment Expense Reserves

We maintain loss reserves to cover our estimated ultimate unpaid liability for claim and claim adjustment expenses, including the estimated cost of the claims adjudication process, for claims that have been reported but not yet settled (case reserves) and claims that have been incurred but not reported (IBNR). IBNR includes a provision for development on known cases as well as a provision for late reported incurred claims. Claim and claim adjustment expense reserves are reflected as liabilities and are included on the Consolidated Balance Sheets under the heading “Insurance Reserves.” Adjustments to prior year reserve estimates, if necessary, are reflected in results of operations in the period that the need for such adjustments is determined. The carried case and IBNR reserves as of each balance sheet date are provided in the Segment Results section of this MD&A and in Note E to the Consolidated Financial Statements included under Item 8.

As discussed in the Risk Factors discussion within Item 1A, there is a risk that our recorded reserves are insufficient to cover our estimated ultimate unpaid liability for claims and claim adjustment expenses. Unforeseen emerging or potential claims and coverage issues are difficult to predict and could materially adversely affect the adequacy of our claim and claim adjustment expense reserves and could lead to future reserve additions.

In addition, our property and casualty insurance subsidiaries also have actual and potential exposures related to A&EP claims, which could result in material losses. To mitigate the risks posed by our exposure to A&EP claims and claim adjustment expenses, we completed a transaction with NICO under which substantially all of our legacy A&EP liabilities were ceded to NICO effective January 1, 2010. See Note E to the Consolidated Financial Statements included under Item 8 for further discussion about the transaction with NICO, its impact on our results of operations and the deferred retroactive reinsurance gain.

Establishing Property & Casualty Reserve Estimates

In developing claim and claim adjustment expense (“loss” or “losses”) reserve estimates, our actuaries perform detailed reserve analyses that are staggered throughout the year. The data is organized at a reserve group level. A reserve group can be a line of business covering a subset of insureds such as commercial automobile liability for small or middle market customers, it can encompass several lines of business provided to a specific set of customers such as dentists, or it can be a particular type of claim such as construction defect. Every reserve group is reviewed at least once during the year. The analyses generally review losses gross of ceded reinsurance and apply the ceded reinsurance terms to the gross estimates to establish estimates net of reinsurance. In addition to the detailed analyses, we review actual loss emergence for all products each quarter.

Most of our business can be characterized as long-tail. For long-tail business, it will generally be several years between the time the business is written and the time when all claims are settled. Our long-tail exposures include commercial automobile liability, workers' compensation, general liability, medical professional liability, other professional liability and management liability coverages, assumed reinsurance run-off and products liability. Short-tail exposures include property, commercial automobile physical damage, marine, surety and warranty. Specialty, Commercial and International contain both long-tail and short-tail exposures. Corporate & Other Non-Core contains long-tail exposures.

Various methods are used to project ultimate losses for both long-tail and short-tail exposures.

The paid development method estimates ultimate losses by reviewing paid loss patterns and applying them to accident or policy years with further expected changes in paid losses. Selection of the paid loss pattern may require

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consideration of several factors, including the impact of inflation on claims costs, the rate at which claims professionals make claim payments and close claims, the impact of judicial decisions, the impact of underwriting changes, the impact of large claim payments and other factors. Claim cost inflation itself may require evaluation of changes in the cost of repairing or replacing property, changes in the cost of medical care, changes in the cost of wage replacement, judicial decisions, legislative changes and other factors. Because this method assumes that losses are paid at a consistent rate, changes in any of these factors can impact the results. Since the method does not rely on case reserves, it is not directly influenced by changes in their adequacy.

For many reserve groups, paid loss data for recent periods may be too immature or erratic for accurate predictions. This situation often exists for long-tail exposures. In addition, changes in the factors described above may result in inconsistent payment patterns. Finally, estimating the paid loss pattern subsequent to the most mature point available in the data analyzed often involves considerable uncertainty for long-tail products such as workers' compensation.

The incurred development method is similar to the paid development method, but it uses case incurred losses instead of paid losses.  Since the method uses more data (case reserves in addition to paid losses) than the paid development method, the incurred development patterns may be less variable than paid patterns. However, selection of the incurred loss pattern typically requires analysis of all of the same factors described above. In addition, the inclusion of case reserves can lead to distortions if changes in case reserving practices have taken place, and the use of case incurred losses may not eliminate the issues associated with estimating the incurred loss pattern subsequent to the most mature point available.

The loss ratio method multiplies earned premiums by an expected loss ratio to produce ultimate loss estimates for each accident or policy year. This method may be useful for immature accident or policy periods or if loss development patterns are inconsistent, losses emerge very slowly or there is relatively little loss history from which to estimate future losses. The selection of the expected loss ratio typically requires analysis of loss ratios from earlier accident or policy years or pricing studies and analysis of inflationary trends, frequency trends, rate changes, underwriting changes and other applicable factors.

The Bornhuetter-Ferguson method using paid loss is a combination of the paid development method and the loss ratio method. This method normally determines expected loss ratios similar to the approach used to estimate the expected loss ratio for the loss ratio method and typically requires analysis of the same factors described above. This method assumes that future losses will develop at the expected loss ratio level. The percent of paid loss to ultimate loss implied from the paid development method is used to determine what percentage of ultimate loss is yet to be paid. The use of the pattern from the paid development method typically requires consideration of the same factors listed in the description of the paid development method. The estimate of losses yet to be paid is added to current paid losses to estimate the ultimate loss for each year. For long-tail lines, this method will react very slowly if actual ultimate loss ratios are different from expectations due to changes not accounted for by the expected loss ratio calculation.

The Bornhuetter-Ferguson method using incurred loss is similar to the Bornhuetter-Ferguson method using paid loss except that it uses case incurred losses. The use of case incurred losses instead of paid losses can result in development patterns that are less variable than paid patterns. However, the inclusion of case reserves can lead to distortions if changes in case reserving have taken place, and the method typically requires analysis of the same factors that need to be reviewed for the loss ratio and incurred development methods.

The frequency times severity method multiplies a projected number of ultimate claims by an estimated ultimate average loss for each accident or policy year to produce ultimate loss estimates. Since projections of the ultimate number of claims are often less variable than projections of ultimate loss, this method can provide more reliable results for reserve groups where loss development patterns are inconsistent or too variable to be relied on exclusively. In addition, this method can more directly account for changes in coverage that impact the number and size of claims. However, this method can be difficult to apply to situations where very large claims or a substantial number of unusual claims result in volatile average claim sizes. Projecting the ultimate number of claims may require analysis of several factors, including the rate at which policyholders report claims to us, the impact of judicial decisions, the impact of underwriting changes and other factors. Estimating the ultimate average loss may require analysis of the impact of large losses and claim cost trends based on changes in the cost of repairing or replacing

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property, changes in the cost of medical care, changes in the cost of wage replacement, judicial decisions, legislative changes and other factors.

Stochastic modeling produces a range of possible outcomes based on varying assumptions related to the particular reserve group being modeled. For some reserve groups, we use models which rely on historical development patterns at an aggregate level, while other reserve groups are modeled using individual claim variability assumptions supplied by the claims department. In either case, multiple simulations using varying assumptions are run and the results are analyzed to produce a range of potential outcomes. The results will typically include a mean and percentiles of the possible reserve distribution which aid in the selection of a point estimate.

For many exposures, especially those that can be considered long-tail, a particular accident or policy year may not have a sufficient volume of paid losses to produce a statistically reliable estimate of ultimate losses. In such a case, our actuaries typically assign more weight to the incurred development method than to the paid development method. As claims continue to settle and the volume of paid loss increases, the actuaries may assign additional weight to the paid development method.  For most of our products, even the incurred losses for accident or policy years that are early in the claim settlement process will not be of sufficient volume to produce a reliable estimate of ultimate losses. In these cases, we may not assign any weight to the paid and incurred development methods. We will use the loss ratio, Bornhuetter-Ferguson and frequency times severity methods.  For short-tail exposures, the paid and incurred development methods can often be relied on sooner, primarily because our history includes a sufficient number of years to cover the entire period over which paid and incurred losses are expected to change. However, we may also use the loss ratio, Bornhuetter-Ferguson and frequency times severity methods for short-tail exposures.

For other more complex reserve groups where the above methods may not produce reliable indications, we use additional methods tailored to the characteristics of the specific situation.

Periodic Reserve Reviews

The reserve analyses performed by our actuaries result in point estimates. Each quarter, the results of the detailed reserve reviews are summarized and discussed with senior management to determine the best estimate of reserves. Senior management considers many factors in making this decision. Our recorded reserves reflect our best estimate as of a particular point in time based upon known facts and circumstances, consideration of the factors cited above and our judgment. The carried reserve may differ from the actuarial point estimate. See Note E to the Consolidated Financial Statements included under Item 8 for further discussion of the factors considered in determining management’s best estimate.

Currently, our recorded reserves are modestly higher than the actuarial point estimate. For Commercial, Specialty and International, the difference between our reserves and the actuarial point estimate is primarily driven by uncertainty with respect to immature accident years,claim cost inflation, changes in claims handling, changes to the tort environment which may adversely impact claim costs and the effects from the economy. For Corporate & Other Non-Core, the difference between our reserves and the actuarial point estimate is primarily driven by the potential tail volatility of run-off exposures.

The key assumptions fundamental to the reserving process are often different for various reserve groups and accident or policy years. Some of these assumptions are explicit assumptions that are required of a particular method, but most of the assumptions are implicit and cannot be precisely quantified. An example of an explicit assumption is the pattern employed in the paid development method. However, the assumed pattern is itself based on several implicit assumptions such as the impact of inflation on medical costs and the rate at which claim professionals close claims. As a result, the effect on reserve estimates of a particular change in assumptions typically cannot be specifically quantified, and changes in these assumptions cannot be tracked over time.

Our recorded reserves are management's best estimate. In order to provide an indication of the variability associated with our net reserves, the following discussion provides a sensitivity analysis that shows the approximate estimated impact of variations in significant factors affecting our reserve estimates for particular types of business. These significant factors are the ones that we believe could most likely materially affect the reserves. This discussion covers the major types of business for which we believe a material deviation to our reserves is reasonably possible. There can be no assurance that actual experience will be consistent with the current assumptions or with the variation

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indicated by the discussion. In addition, there can be no assurance that other factors and assumptions will not have a material impact on our reserves.

The three areas for which we believe a significant deviation to our net reserves is reasonably possible are (i) professional liability, management liability and surety products; (ii) workers' compensation; and (iii) general liability.

Professional liability, management liability and surety products include professional liability coverages provided to various professional firms, including architects, real estate agents, small and mid-sized accounting firms, law firms and other professional firms. They also include directors and officers (D&O), employment practices, fiduciary, fidelity and surety coverages, as well as insurance products serving the healthcare delivery system. The most significant factor affecting reserve estimates for these liability coverages is claim severity. Claim severity is driven by the cost of medical care, the cost of wage replacement, legal fees, judicial decisions, legislative changes and other factors. Underwriting and claim handling decisions such as the classes of business written and individual claim settlement decisions can also impact claim severity. If the estimated claim severity increases by 9%, we estimate that net reserves would increase by approximately $450 million. If the estimated claim severity decreases by 3%, we estimate that net reserves would decrease by approximately $150 million. Our net reserves for these products were approximately $5.2 billion as of December 31, 2016.

For workers' compensation, since many years will pass from the time the business is written until all claim payments have been made, the most significant factor affecting workers' compensation reserve estimates is claim cost inflation on claim payments. Workers' compensation claim cost inflation is driven by the cost of medical care, the cost of wage replacement, expected claimant lifetimes, judicial decisions, legislative changes and other factors. If estimated workers' compensation claim cost inflation increases by 100 basis points for the entire period over which claim payments will be made, we estimate that our net reserves would increase by approximately $400 million. If estimated workers' compensation claim cost inflation decreases by 100 basis points for the entire period over which claim payments will be made, we estimate that our net reserves would decrease by approximately $350 million. Our net reserves for workers' compensation were approximately $4.3 billion as of December 31, 2016.

For general liability, the most significant factor affecting reserve estimates is claim severity. Claim severity is driven by changes in the cost of repairing or replacing property, the cost of medical care, the cost of wage replacement, judicial decisions, legislation and other factors. If the estimated claim severity for general liability increases by 6%, we estimate that our net reserves would increase by approximately $200 million. If the estimated claim severity for general liability decreases by 3%, we estimate that our net reserves would decrease by approximately $100 million. Our net reserves for general liability were approximately $3.4 billion as of December 31, 2016.

Given the factors described above, it is not possible to quantify precisely the ultimate exposure represented by claims and related litigation. As a result, we regularly review the adequacy of our reserves and reassess our reserve estimates as historical loss experience develops, additional claims are reported and settled and additional information becomes available in subsequent periods. In reviewing our reserve estimates, we make adjustments in the period that the need for such adjustments is determined. These reviews have resulted in our identification of information and trends that have caused us to change our reserves in prior periods and could lead to our identification of a need for additional material increases or decreases in claim and claim adjustment expense reserves, which could materially affect our results of operations, equity, business and insurer financial strength and corporate debt ratings positively or negatively. See discussion within Note E to the Consolidated Financial Statements included under Item 8 for additional information about reserve development and the Ratings section of this MD&A for further information regarding our financial strength and corporate debt ratings.

Life & Group Non-Core Policyholder Reserves

Our Life and Group Non-Core segment includes our run-off long term care business as well as structured settlement obligations related to certain property and casualty claimants not funded by annuities. Long term care policies provide benefits for nursing homes, assisted living and home health care subject to various daily and lifetime caps. Policyholders must continue to make periodic premium payments to keep the policy in force. Generally we have the ability to increase policy premiums, subject to state regulatory approval.

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We maintain both claim and claim adjustment expense reserves as well as future policy benefits reserves for policyholder benefits for our Life & Group Non-Core segment. Claim and claim adjustment expense reserves consist of estimated reserves for long term care policyholders that are currently receiving benefits, including claims that have been incurred but are not yet reported. In developing the claim and claim adjustment expense reserve estimates for our long term care policies, our actuaries perform a detailed claim experience study on an annual basis. The study reviews the sufficiency of existing reserves for policyholders currently on claim and includes an evaluation of expected benefit utilization and claim duration. Our recorded claim and claim adjustment expense reserves reflect management's best estimate after incorporating the results of the most recent study. In addition, claim and claim adjustment expense reserves are also maintained for the structured settlement obligations. Future policy benefits reserves represent the active life reserves related to our long term care policies and are the present value of expected future benefit payments and expenses less expected future premium. The determination of these reserves is fundamental to our financial results and requires management to make estimates and assumptions about expected investment and policyholder experience over the life of the contract. Since many of these contracts may be in force for several decades, these assumptions are subject to significant estimation risk.

The actuarial assumptions that management believes are subject to the most variability are morbidity, persistency, discount rate and anticipated future premium rate increases. Persistency can be affected by policy lapses and death. Discount rate is influenced by the investment yield on assets supporting long term care reserves which is subject to interest rate and market volatility and may also be impacted by changes to the corporate tax code. There is limited historical company and industry data available to us for long term care morbidity and mortality, as only a portion of the policies written to date are in claims paying status. As a result of this variability, our long term care reserves may be subject to material increases if actual experience develops adversely to our expectations.

Annually, management assesses the adequacy of its GAAP long term care future policy benefits reserves as well as the claim and claim adjustment expense reserves for structured settlement obligations by performing a gross premium valuation (GPV) to determine if there is a premium deficiency. Under the GPV, management estimates required reserves using best estimate assumptions as of the date of the assessment without provisions for adverse deviation. The GPV reserves are then compared to the recorded reserves. If the GPV reserves are greater than the existing net GAAP reserves (i.e. reserves net of any deferred acquisition costs asset), the existing net GAAP reserves are unlocked and are increased to the greater amount. Any such increase is reflected in our results of operations in the period in which the need for such adjustment is determined, and could materially adversely affect our results of operations, equity and business and insurer financial strength and corporate debt ratings.

The December 31, 2016 GPV indicated carried reserves included a margin of approximately $255 million. A summary of the changes in the GPV results is presented in the table below:

Long Term Care Active Life Reserve - Change in GPV (In millions)
December 31, 2015 Margin	$	—
Changes in underlying morbidity assumptions	(130		)
Changes in underlying persistency assumptions	25
Changes in underlying discount rate assumptions	(45		)
Changes in underlying premium rate action assumptions	350
Changes in underlying expense and other assumptions	55
December 31, 2016 Margin	$	255

The increase in the margin in 2016 was driven by expected rate increases from near-term future rate filings on segments of our individual long term care block of business as well as higher than expected premium rate increase achievement on rate filings related to our group long term care block.  This improvement from rate actions was partially offset by minor changes in morbidity assumptions. The effects of persistency and discount rates were relatively small and largely offset one another.  Additionally, in 2016 our annual experience study of long term care claim reserves resulted in a release of $30 million due to favorable severity relative to expectations.

The December 31, 2015 GPV indicated a premium deficiency of $296 million resulting in the unlocking of reserves and the resetting of actuarial assumptions to best estimate assumptions at that date. The indicated premium deficiency necessitated a charge to income of $296 million. In addition to the premium deficiency, our annual

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experience study of claim reserves resulted in reserve strengthening of $9 million. The total after-tax impact of the premium deficiency and claim reserve strengthening was $198 million.

The table below summarizes the estimated pretax impact on our results of operations from various hypothetical revisions to our active life reserve assumptions. We have assumed that revisions to such assumptions would occur in each policy type, age and duration within each policy group and would occur absent any changes, mitigating or otherwise, in the other assumptions. Although such hypothetical revisions are not currently required or anticipated, we believe they could occur based on past variances in experience and our expectations of the ranges of future experience that could reasonably occur. Any required increase in the net GAAP reserves resulting from the hypothetical revision in the table below would first reduce the margin in our carried reserves before it would affect results of operations. The estimated impacts to results of operations in the table below are after consideration of the existing margin.

December 31, 2016
	Estimated reduction to pretax income
Hypothetical revisions (In millions)
Morbidity:
5% increase in morbidity	$	372
10% increase in morbidity	999
Persistency:
5% decrease in active life mortality and lapse	$	—
10% decrease in active life mortality and lapse	163
Discount Rates:
50 basis point decline in future interest rates	$	156
100 basis point decline in future interest rates	664
Premium Rate Actions:
25% decrease in anticipated future rate increases premium	$	—
50% decrease in anticipated future rate increases premium	142

As referenced in Item 1A Risk Factors, modification of the corporate tax rate could adversely affect the value of the tax benefit received on tax exempt municipal investments and thus the rate at which we discount our long term care active life reserves. For illustrative reference, absent a change in investment strategy, a reduction in the corporate tax rate to 20% would require an increase to our existing net GAAP reserves for the LTC business and an estimated reduction to pretax income of approximately $700 million.

Any actual adjustment would be dependent on the specific policies affected and, therefore, may differ from the estimates summarized above.

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CONSOLIDATED OPERATIONS

Results of Operations

The following table includes the consolidated results of our operations. For more detailed components of our business operations and the net operating income financial measure, see the segment discussions within this MD&A. For further discussion of Net investment income and Net realized investment results, see the Investments section of this MD&A.

Years ended December 31
(In millions)	2016			2015			2014
Operating Revenues
Net earned premiums	$	6,924		$	6,921		$	7,212
Net investment income	1,988			1,840			2,067
Other revenues	404			407			356
Total operating revenues	9,316			9,168			9,635
Claims, Benefits and Expenses
Net incurred claims and benefits	5,270			5,372			5,577
Policyholders' dividends	13			12			14
Amortization of deferred acquisition costs	1,235			1,540			1,317
Other insurance related expenses	1,122			1,093			1,029
Other expenses	589			535			548
Total claims, benefits and expenses	8,229			8,552			8,485
Operating income before income tax	1,087			616			1,150
Income tax expense on operating income	(263		)	(101		)	(301		)
Net operating income	824			515			849
Net realized investment gains (losses)	50			(67		)	57
Income tax (expense) benefit on net realized investment gains (losses)	(15		)	31			(18		)
Net realized investment gains (losses), after tax	35			(36		)	39
Income from continuing operations	859			479			888
Loss from discontinued operations, net of tax	—			—			(197		)
Net income	$	859		$	479		$	691

2016 Compared with 2015

Net operating income increased $309 million in 2016 as compared with 2015. Net operating results increased $293 million for our non-core segments primarily as a result of a $198 million after-tax charge in 2015 related to increasing long term care active life and claim reserves. As our active life reserve assumptions were unlocked in 2015, long term care results in 2016 improved significantly. Net operating income increased $16 million for our core segments due to higher favorable net prior year reserve development and net investment income, partially offset by an increase in the current accident year loss ratio and higher underwriting expenses. Catastrophe losses were $111 million after tax in 2016 as compared to $95 million after tax in 2015.

Favorable net prior year development of $314 million and $218 million was recorded in 2016 and 2015 related to our Specialty, Commercial, International and Corporate & Other Non-Core segments. Further information on net prior year development is in Note E to the Consolidated Financial Statements included under Item 8.

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2015 Compared with 2014

Net operating income decreased $334 million in 2015 as compared with 2014. Net operating income decreased $44 million for our core segments due to a decrease in net investment income driven by lower limited partnership returns, partially offset by improved underwriting results. Catastrophe losses were $95 million after tax in 2015 as compared to $102 million after tax in 2014. Net operating results decreased $290 million for our non-core segments driven by a $198 million after-tax charge related to recognition of a premium deficiency and a small deficiency in claim reserves in our long term care business, as further discussed in Reserves-Estimates and Uncertainties within this MD&A, as well as in Note A to the Consolidated Financial Statements included under Item 8. Additionally, results in 2015 decreased $51 million as compared to 2014 as a result of the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer, as further discussed at Note E to the Consolidated Financial Statements included under Item 8.

Favorable net prior year development of $218 million and $53 million was recorded in 2015 and 2014 related to our Specialty, Commercial, International and Corporate & Other Non-Core segments. Further information on net prior year development is in Note E to the Consolidated Financial Statements included under Item 8.

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SEGMENT RESULTS

The following discusses the results of operations for our business segments.

Our core property and casualty commercial insurance operations are managed and reported in three business segments: Specialty, Commercial and International. Specialty provides a broad array of professional, financial and specialty property and casualty products and services through a network of independent agents, brokers and managing general underwriters. Commercial includes property and casualty coverages sold to small businesses and middle market entities and organizations primarily through an independent agency distribution system. Commercial also includes commercial insurance and risk management products sold to large corporations primarily through insurance brokers. International provides management and professional liability coverages as well as a broad range of other property and casualty insurance products and services abroad through a network of brokers, independent agencies and managing general underwriters, as well as the Lloyd’s marketplace.

Our non-core operations are managed and reported in two segments: Life & Group Non-Core and Corporate & Other Non-Core. Life & Group Non-Core primarily includes the results of our long term care business that is in run-off. Corporate & Other Non-Core primarily includes certain corporate expenses, including interest on corporate debt, and the results of certain property and casualty business in run-off, including CNA Re and A&EP. Intersegment eliminations are also included in this segment.

Our property and casualty field structure consists of 49 underwriting locations across the United States. In addition, there are five centralized processing operations which handle policy processing, billing and collection activities and also act as call centers to optimize service. The claims structure consists of a national claim center designed to efficiently handle the high volume of low severity claims, including property damage, liability and workers' compensation medical only claims, and 16 principal claim offices handling the more complex claims. We also have a presence in Canada, Europe, China and Singapore consisting of 17 branch operations and access to business placed at Lloyd's of London through Hardy Syndicate 382.

We utilize the net operating income (loss) financial measure to monitor our operations. Net operating income (loss) is calculated by excluding from net income (loss) the after-tax effects of 1) net realized investment gains or losses, 2) income or loss from discontinued operations and 3) any cumulative effects of changes in accounting guidance. The calculation of net operating income (loss) excludes net realized investment gains or losses because net realized investment gains or losses are largely discretionary, except for some losses related to other-than-temporary impairment (OTTI) losses, and are generally driven by economic factors that are not necessarily consistent with key drivers of underwriting performance, and are therefore not considered an indication of trends in insurance operations. Management monitors net operating income (loss) for each business segment to assess segment performance. Presentation of consolidated net operating income (loss) is deemed to be a non-GAAP financial measure. See further discussion regarding how we manage our business and reconciliations of non-GAAP measures to the most comparable GAAP measures and other information in Note O to the Consolidated Financial Statements included under Item 8.

In evaluating the results of our Specialty, Commercial and International segments, we utilize the loss ratio, the expense ratio, the dividend ratio and the combined ratio. These ratios are calculated using GAAP financial results. The loss ratio is the percentage of net incurred claim and claim adjustment expenses to net earned premiums. The expense ratio is the percentage of insurance underwriting and acquisition expenses, including the amortization of deferred acquisition costs, to net earned premiums. The dividend ratio is the ratio of policyholders' dividends incurred to net earned premiums. The combined ratio is the sum of the loss, expense and dividend ratios. In addition we also utilize rate, retention and new business in evaluating operating trends. Rate represents the average change in price on policies that renew excluding exposure change. Retention represents the percentage of premium dollars renewed in comparison to the expiring premium dollars from policies available to renew. New business represents premiums from policies written with new customers and additional policies written with existing customers.

Changes in estimates of claim and allocated claim adjustment expense reserves and premium accruals, net of reinsurance, for prior years are defined as net prior year development within this MD&A. These changes can be favorable or unfavorable. Net prior year development does not include the impact of related acquisition expenses. Further information on our reserves is provided in Note E to the Consolidated Financial Statements included under Item 8.

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Specialty

Specialty provides management and professional liability and other coverages through property and casualty products and services using a network of brokers, independent agencies and managing general underwriters. Specialty includes the following business groups:

Management & Professional Liability provides management and professional liability insurance and risk management services and other specialized property and casualty coverages. This group provides professional liability coverages to various professional firms, including architects, real estate agents, accounting firms, law firms and other professional firms. Management & Professional Liability also provides D&O, employment practices, fiduciary and fidelity coverages. Specific areas of focus include small and mid-size firms, public as well as privately held firms and not-for-profit organizations, where tailored products for these client segments are offered. Products within Management & Professional Liability are distributed through brokers, independent agents and managing general underwriters. Management & Professional Liability, through CNA HealthCare, alsooffers insurance products to serve the healthcare industry. Products include professional and general liability as well as associated standard property and casualty coverages, and are distributed on a national basis through brokers, independent agents and managing general underwriters. Key customer groups include aging services, allied medical facilities, life sciences, dentists, physicians, hospitals and nurses and other medical practitioners.

Surety offers small, medium and large contract and commercial surety bonds. Surety provides surety and fidelity bonds in all 50 states through a network of independent agencies and brokers.

Warranty and Alternative Risks provides extended service contracts and related products that provide protection from the financial burden associated with mechanical breakdown and other related losses, primarily for vehicles and portable electronic communication devices.

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The following table details the results of operations for Specialty.

Years ended December 31
(In millions, except ratios, rate and retention)	2016			2015			2014
Net written premiums	$	2,780		$	2,781		$	2,839
Net earned premiums	2,779			2,782			2,838
Net investment income	516			474			560
Net operating income	650			560			634
Net realized investment gains (losses), after tax	3			(22		)	10
Net income	653			538			644
Other performance metrics:
Loss and loss adjustment expense ratio	52.8		%	57.4		%	57.3		%
Expense ratio	32.0			31.1			30.1
Dividend ratio	0.2			0.2			0.2
Combined ratio	85.0		%	88.7		%	87.6		%
Rate	1		%	1		%	3		%
Retention	87		%	87		%	87		%
New Business	$	252		$	279		$	309

2016 Compared with 2015

Net written premiums for Specialty in 2016 were consistent with 2015 as growth in warranty was offset by a decrease in management and professional liability and healthcare due to underwriting actions undertaken in certain business lines. The trend in net earned premiums was consistent with net written premiums.

Net operating income increased $90 million in 2016 as compared with 2015, primarily due to higher favorable net prior year reserve development and net investment income partially offset by higher underwriting expenses and current accident year net loss and loss adjustment expenses.

The combined ratio decreased 3.7 points in 2016 as compared with 2015. The loss ratio decreased 4.6 points due to higher favorable net prior year reserve development partially offset by a higher current accident year loss ratio. Catastrophe losses were $18 million, or 0.6 points of the loss ratio, for 2016, as compared to $13 million, or 0.4 points of the loss ratio, for 2015. The expense ratio increased 0.9 points in 2016 as compared with 2015, due to higher employee costs and higher IT spending primarily related to new underwriting platforms.

Favorable net prior year development of $305 million and $152 million was recorded in 2016 and 2015. Further information on net prior year development is in Note E to the Consolidated Financial Statements included under Item 8.

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The following table summarizes the gross and net carried reserves for Specialty.

December 31
(In millions)	2016		2015
Gross case reserves	$	1,871	$	2,011
Gross IBNR reserves	4,278		4,258
Total gross carried claim and claim adjustment expense reserves	$	6,149	$	6,269
Net case reserves	$	1,681	$	1,810
Net IBNR reserves	3,723		3,758
Total net carried claim and claim adjustment expense reserves	$	5,404	$	5,568

2015 Compared with 2014

Net written premiums for Specialty decreased $58 million in 2015 as compared with 2014, driven by lower new business. The decrease in net earned premiums was consistent with the trend in net written premiums.

Net operating income decreased $74 million in 2015 as compared with 2014, primarily due to lower net investment income.

The combined ratio increased 1.1 points in 2015 as compared with 2014. The loss ratio increased 0.1 points due to deterioration in the current accident year loss ratio, primarily offset by higher net favorable prior year development. Catastrophe losses were $13 million, or 0.4 points of the loss ratio, for 2015 as compared to $21 million, or 0.7 points of the loss ratio, for 2014. The expense ratio increased 1.0 point in 2015 as compared with 2014, driven by increased underwriting expenses and the unfavorable effect of lower net earned premiums.

Favorable net prior year development of $152 million and $149 million was recorded in 2015 and 2014. Further information on net prior year development is in Note E to the Consolidated Financial Statements included under Item 8.

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Commercial

Commercial works with a network of brokers and independent agents to market a broad range of property and casualty insurance products and services to small, middle-market and large businesses. Property products include standard and excess property, marine and boiler and machinery coverages. Casualty products include standard casualty insurance products such as workers' compensation, general and product liability, commercial auto and umbrella coverages. Most insurance programs are provided on a guaranteed cost basis; however, we also offer specialized loss-sensitive insurance programs and total risk management services relating to claim and information services to the large commercial insurance marketplace through a wholly-owned subsidiary, CNA ClaimPlus, Inc., a third-party administrator.

These property and casualtyproducts are offered through our Middle Market, Small Business and Other Commercial insurance groups.

The following table details the results of operations for Commercial.

Years ended December 31
(In millions, except ratios, rate and retention)	2016			2015			2014
Net written premiums	$	2,841		$	2,818		$	2,817
Net earned premiums	2,804			2,788			2,906
Net investment income	638			593			723
Net operating income	311			369			307
Net realized investment gains (losses), after tax	2			(31		)	10
Net income	313			338			317
Other performance metrics:
Loss and loss adjustment expense ratio	68.7		%	65.1		%	75.3		%
Expense ratio	36.8			36.1			33.7
Dividend ratio	0.3			0.3			0.3
Combined ratio	105.8		%	101.5		%	109.3		%
Rate	(2		)%	1		%	5		%
Retention	84		%	78		%	73		%
New Business	$	524		$	552		$	491

2016 Compared with 2015

Net written premiums for Commercial increased $23 million in 2016 as compared with 2015, driven by strong retention in middle markets partially offset by a decrease in small business, which included a premium rate adjustment more fully discussed in Note F to the Consolidated Financial Statements under Item 8.  The increase in net earned premium was consistent with the trend in net written premiums.

Net operating income decreased $58 million in 2016 as compared with 2015, due to a higher underwriting loss partially offset by an increase in net investment income.

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The combined ratio increased 4.3 points in 2016 as compared to 2015. The loss ratio increased 3.6 points due to the unfavorable period over period effect of net prior year reserve development and a higher current accident year loss ratio due to higher large losses. Catastrophe losses were $116 million, or 4.1 points of the loss ratio, for 2016 primarily driven by U.S. weather-related events, as compared to $101 million, or 3.6 points of the loss ratio, for 2015. The expense ratio increased 0.7 points in 2016 as compared with 2015, due to higher employee costs and higher IT spending primarily related to a new underwriting platform.

Unfavorable net prior year development of $53 million was recorded in 2016 as compared with favorable net prior year development of $30 million in 2015. Further information on net prior year development is in Note E to the Consolidated Financial Statements included under Item 8.

The following table summarizes the gross and net carried reserves for Commercial.

December 31
(In millions)	2016		2015
Gross case reserves	$	4,661	$	4,975
Gross IBNR reserves	4,233		4,208
Total gross carried claim and claim adjustment expense reserves	$	8,894	$	9,183
Net case reserves	$	4,353	$	4,651
Net IBNR reserves	3,952		3,925
Total net carried claim and claim adjustment expense reserves	$	8,305	$	8,576

2015 Compared with 2014

Net written premiums for Commercial were consistent in 2015 as compared with 2014. Positive rate and higher retention and new business were offset by the residual effect of previous underwriting actions undertaken in certain business classes. Net earned premiums decreased $118 million in 2015 as compared with 2014, consistent with the trend in recent quarters in net written premiums.

Net operating income increased $62 million in 2015 as compared with 2014. This increase was primarily due to improved underwriting results partially offset by lower net investment income.

The combined ratio improved 7.8 points in 2015 as compared to 2014. The loss ratio improved 10.2 points, due to favorable net prior year development for 2015 as compared to unfavorable net prior year development for 2014 and an improved current accident year loss ratio. Catastrophe losses were $101 million, or 3.6 points of the loss ratio, for 2015, as compared to $125 million, or 4.4 points of the loss ratio, for 2014. The expense ratio increased 2.4 points in 2015 as compared with 2014, due to higher expenses, including increased commissions, the favorable impact in 2014 of recoveries on insurance receivables written off in prior years and the unfavorable effect of lower net earned premiums.

Favorable net prior year development of $30 million was recorded in 2015 as compared with unfavorable net prior year development of $156 million in 2014. Further information on net prior year development is in Note E to the Consolidated Financial Statements included under Item 8.

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International

International provides property and casualty and specialty coverages on a global basis through its operations in Canada, the United Kingdom, Continental Europe, China and Singapore, as well as through its presence at Lloyd’s of London.

The International business is grouped into broad business units which include Energy & Marine, Property, Casualty, Specialty, and Healthcare & Technology. International is managed across three territorial platforms from Head Offices in London and Toronto.

Canada provides standard commercial and specialty insurance products, primarily in the marine, oil & gas, construction, manufacturing and life science industries.

CNA Europe provides a diverse range of specialty products as well as commercial insurance products primarily in the marine, property, financial services and healthcare & technology industries throughout Europe on both a domestic and cross border basis.

Hardy operates through Lloyd’s Syndicate 382 underwriting primarily short-tail exposures in energy, marine, property, casualty and specialty lines with risks located in many countries around the world. The capacity of and results from the syndicate are 100% attributable to CNA.

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The following table details the results of operations for International.

Years ended December 31
(In millions, except ratios, rate and retention)	2016			2015			2014
Net written premiums	$	821		$	822		$	880
Net earned premiums	806			804			913
Net investment income	51			52			61
Net operating income	21			37			69
Net realized investment gains, after tax	15			1			—
Net income	36			38			69
Other performance metrics:
Loss and loss adjustment expense ratio	61.0		%	59.5		%	53.5		%
Expense ratio	38.1			38.1			38.9
Combined ratio	99.1		%	97.6		%	92.4		%
Rate	(1		)%	(1		)%	(1		)%
Retention	76		%	76		%	74		%
New Business(1)	$	240		$	111		$	115

(1) Beginning in 2016, new business includes Hardy. New business for Hardy was $133 million for the year ended December 31, 2016.

2016 Compared with 2015

Net written premiums for International in 2016 were consistent with 2015 and includes favorable period over period premium development of $24 million. Excluding the effect of foreign currency exchange rates and premium development, net written premiums increased 1.4% in 2016. Excluding the effect of foreign currency exchange rates and premium development, the increase in net earned premiums was consistent with the trend in net written premiums.

Net operating income decreased $16 million in 2016 as compared with 2015, primarily due to a lower underwriting profit and foreign currency exchange losses.

The combined ratio increased 1.5 points in 2016 as compared with 2015. The loss ratio increased 1.5 points, primarily due to an increase in the current accident year loss ratio driven by a higher level of large losses related to political risk, property and financial institutions, partially offset by higher favorable net prior year development. Catastrophe losses were $31 million, or 3.9 points of the loss ratio, for 2016 primarily driven by the Fort McMurray wildfires, as compared to $27 million, or 3.3 point of the loss ratio, for 2015. The expense ratio was consistent with 2015.

Favorable net prior year development of $64 million and $36 million was recorded in 2016 and 2015. Further information on net prior year development is in Note E to the Consolidated Financial Statements included under Item 8.

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The following table summarizes the gross and net carried reserves for International.

December 31
(In millions)	2016		2015
Gross case reserves	$	632	$	622
Gross IBNR reserves	696		725
Total gross carried claim and claim adjustment expense reserves	$	1,328	$	1,347
Net case reserves	$	548	$	531
Net IBNR reserves	653		688
Total net carried claim and claim adjustment expense reserves	$	1,201	$	1,219

2015 Compared with 2014

Net written premiums for International decreased $58 million in 2015 as compared with 2014, driven by the unfavorable effect of foreign currency exchange rates, the 2014 termination of a specialty product managing general underwriter relationship in Canada and unfavorable premium development at Hardy. Excluding the effect of foreign currency exchange rates, net written premiums increased 2.4% in 2015 as compared with 2014. Net earned premiums decreased $109 million in 2015 as compared with 2014, consistent with the trend in net written premiums.

Net operating income decreased $32 million in 2015 as compared with 2014. This decrease was due to less favorable underwriting results, partially offset by less unfavorable effects of foreign currency exchange rates.

The combined ratio increased 5.2 points in 2015 as compared with 2014. The loss ratio increased 6.0 points, primarily due to less favorable net prior year development and an increase in the current accident year loss ratio driven by large losses. Catastrophe losses were $27 million, or 3.3 points of the loss ratio, for 2015, as compared to $10 million, or 1.0 point of the loss ratio, for 2014. The expense ratio improved 0.8 points in 2015 as compared with 2014 due to lower expenses, partially offset by the unfavorable effect of lower net earned premiums.

Favorable net prior year development of $36 million and $57 million was recorded in 2015 and 2014. Further information on net prior year development is in Note E to the Consolidated Financial Statements included under Item 8.

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Life & Group Non-Core

The Life & Group Non-Core segment primarily includes the results of our long term care business that is in run-off. Long term care policies were sold on both an individual and group basis. While considered non-core, new enrollees in existing groups were accepted through February 1, 2016.

On August 1, 2014, we closed the sale of the common stock of CAC, our life insurance subsidiary. In connection with the sale, we recorded an after-tax loss on sale of $211 million, which is reflected in Loss from discontinued operations. Further information is provided in Notes A and P to the Consolidated Financial Statements included under Item 8.

In connection with the sale of CAC, we entered into a 100% coinsurance agreement on a separate small block of annuity business outside of CAC. As a result of the funds withheld basis used in this transaction, we recognized an after-tax operating loss of $34 million in 2014. Further information is provided in Note A to the Consolidated Financial Statements under Item 8.

The following table summarizes the results of operations for Life & Group Non-Core.

Years ended December 31
(In millions)	2016		2015			2014
Net earned premiums	$	536	$	548		$	556
Net investment income	767		704			700
Net operating income (loss)	20		(314		)	(69		)
Net realized investment gains, after tax	16		8			7
Net income (loss)	36		(306		)	(62		)

In 2015, we recognized a $198 million after-tax charge relating to a premium deficiency and claim reserve strengthening. The December 31, 2015 GPV indicated a premium deficiency of $296 million. The indicated premium deficiency necessitated a charge to income that was affected by the write off of the entire long term care deferred acquisition cost of $289 million and an increase to active life reserves of $7 million. Due to the recognition of the premium deficiency and resetting of actuarial assumptions in the fourth quarter of 2015, the operating results of our long term care business in 2016 reflect the variance between actual experience and the expected results contemplated in our best estimate reserves. In 2015, results of our long term care business reflected variances between actual experience and actuarial assumptions that were locked-in at policy issuance. As a result of the reserve assumption unlocking, the 2016 and 2015 results are not comparable.

2016

Net operating income of $20 million was driven by a favorable release of claim reserves resulting from the annual claims experience study and higher net investment income due to an increase in the invested asset base. The long term care results were generally in line with expectations, as the impact of favorable morbidity was partially offset by unfavorable persistency.

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The following table summarizes policyholder reserves for Life & Group Non-Core.

December 31, 2016
(In millions)	Claim and claim adjustment expenses		Future policy benefits		Total
Long term care	$	2,426	$	8,654	$	11,080
Structured settlement annuities	565		—		565
Other	17		—		17
Total	3,008		8,654		11,662
Shadow adjustments (1)	101		1,459		1,560
Ceded reserves (2)	249		213		462
Total gross reserves	$	3,358	$	10,326	$	13,684

December 31, 2015
(In millions)	Claim and claim adjustment expenses		Future policy benefits		Total
Long term care	$	2,229	$	8,335	$	10,564
Structured settlement annuities	581		—		581
Other	21		—		21
Total	2,831		8,335		11,166
Shadow adjustments (1)	99		1,610		1,709
Ceded reserves (2)	290		207		497
Total gross reserves	$	3,220	$	10,152	$	13,372

(1) To the extent that unrealized gains on fixed income securities supporting long term care products and annuity contracts would result in a premium deficiency if those gains were realized, an increase in Insurance reserves is recorded, net of tax, as a reduction of net unrealized gains through Other comprehensive income (loss) (Shadow Adjustments).

(2) Ceded reserves relate to claim or policy reserves fully reinsured in connection with a sale or exit from the underlying business.

2015 Compared with 2014

Net earned premiums for Life & Group Non-Core decreased $8 million in 2015 as compared with 2014. The effect of policy lapses was substantially offset by premium rate increases.

Net operating loss increased $245 million in 2015 as compared with 2014. The increase was driven by a $296 million charge related to recognition of a premium deficiency and a $9 million deficiency in claim reserves in our long term care business. The after-tax impact of both of these items was $198 million. Excluding the effects of these items, results in 2015 were also negatively affected by higher morbidity in our long term care business. Results in 2014 were negatively affected by a $34 million after-tax loss on a coinsurance transaction related to the sale of CAC. For further discussion of drivers of the premium deficiency, see the Reserves - Estimates and Uncertainties section of this MD&A.

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Corporate & Other Non-Core

Corporate & Other Non-Core primarily includes certain corporate expenses, including interest on corporate debt and the results of certain property and casualty business in run-off, including CNA Re and A&EP.

The following table summarizes the results of operations for the Corporate & Other Non-Core segment, including intersegment eliminations.

Years ended December 31
(In millions)	2016			2015			2014
Net investment income	$	16		$	17		$	23
Interest expense	155			154			182
Net operating loss	(178		)	(137		)	(92		)
Net realized investment (losses) gains, after tax	(1		)	8			12
Net loss	(179		)	(129		)	(80		)

2016 Compared with 2015

Net operating loss increased $41 million in 2016 as compared with 2015. Results in both periods were negatively affected by after-tax charges related to the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer. The Loss Portfolio Transfer drove $18 millionof the year over year change. This is further discussed in Note E to the Consolidated Financial Statements included under Item 8.

The following table summarizes the gross and net carried reserves for Corporate & Other Non-Core.

December 31
(In millions)	2016		2015
Gross case reserves	$	1,524	$	1,521
Gross IBNR reserves	1,090		1,123
Total gross carried claim and claim adjustment expense reserves	$	2,614	$	2,644
Net case reserves	$	94	$	130
Net IBNR reserves	136		153
Total net carried claim and claim adjustment expense reserves	$	230	$	283

2015 Compared with 2014

Net operating loss increased $45 million in 2015 as compared with 2014. Results in 2015 were negatively affected by an increase in gross A&EP claim reserves. While all of this reserve development is reinsured under the Loss Portfolio Transfer, only a portion of the reinsurance recovery is currently recognized because of the application of retroactive reinsurance accounting. As a result, the net operating loss comparison was negatively affected by $51 million, as further discussed in Note E to the Consolidated Financial Statements included under Item 8. Results in 2015 benefited from lower interest expense due to the maturity of higher coupon debt in the fourth quarter of 2014. Results in 2014 included a $56 million after-tax curtailment gain related to a change in postretirement benefits, substantially offset by a $55 million after-tax lump sum pension plan settlement, as further discussed in Note I to the Consolidated Financial Statements included under Item 8.

No net prior year development was recorded for the year ended December 31, 2015 as compared with favorable net prior year development of $3 million for the year ended December 31, 2014.

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INVESTMENTS

Net Investment Income

The significant components of Net investment income are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Fixed maturity securities:
Taxable	$	1,414		$	1,375		$	1,399
Tax-Exempt	405			376			404
Total fixed maturity securities	1,819			1,751			1,803
Limited partnership investments	155			92			263
Other, net of investment expense	14			(3		)	1
Net investment income	$	1,988		$	1,840		$	2,067
Net investment income, after tax	$	1,427		$	1,329		$	1,473
Effective income yield for the fixed maturity securities portfolio, pretax	4.8		%	4.7		%	4.8		%
Effective income yield for the fixed maturity securities portfolio, after tax	3.5		%	3.4		%	3.5		%

Net investment income, after tax, increased $98 million in 2016 as compared with 2015. The increase was driven by limited partnership investments, which returned 6.3% in 2016 as compared with 3.0% in the prior year. Income from fixed maturity securities, after tax, increased $44 million primarily due to an increase in the invested asset base and a charge in 2015 related to a change in estimate effected by a change in accounting principle.

Net investment income, after tax, decreased $144 million in 2015 as compared with 2014. The decrease was driven by limited partnership investments, which returned 3.0% in 2015 as compared with 9.7% in the prior year. Income from fixed maturity securities, after tax, decreased $34 million driven by a $25 million change in estimate effected by a change in accounting principle to better reflect the yield on fixed maturity securities that have call provisions. Additionally income from fixed maturity securities decreased due to lower reinvestment rates, partially offset by favorable changes in estimates for prepayments for asset-backed securities. See further discussion of the accounting change in Note A to the Consolidated Financial Statements included under Item 8.

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Net Realized Investment Gains (Losses)

The components of Net realized investment results are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Fixed maturity securities:
Corporate and other bonds	$	31		$	(55	)	$	67
States, municipalities and political subdivisions	29			(22		)	(7		)
Asset-backed	(2		)	10			(21		)
Foreign government	3			1			2
U.S. Treasury and obligations of government-sponsored enterprises	5			—			—
Total fixed maturity securities	66			(66		)	41
Equity securities	(5		)	(23		)	1
Derivative securities	(2		)	10			(1		)
Short term investments and other	(9		)	12			16
Net realized investment gains (losses)	50			(67		)	57
Income tax (expense) benefit on net realized investment gains (losses)	(15		)	31			(18		)
Net realized investment gains (losses), after tax	$	35		$	(36	)	$	39

Net realized investment results, after tax, increased $71 million for 2016 as compared with 2015, driven by lower OTTI losses recognized in earnings and higher net realized investment gains on sales of securities. Net realized investment results, after tax, decreased $75 million for 2015 as compared with 2014, driven by higher OTTI losses recognized in earnings and lower net realized investment gains on sales of securities.

Further information on our realized gains and losses, including our OTTI losses and derivative gains (losses), as well as our impairment decision process, is set forth in Notes A and B to the Consolidated Financial Statements included under Item 8.

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Portfolio Quality

The following table presents the estimated fair value and net unrealized gains (losses) of our fixed maturity securities by rating distribution.

December 31	2016				2015
(In millions)	Estimated Fair Value		Net Unrealized Gains (Losses)		Estimated Fair Value		Net Unrealized Gains (Losses)
U.S. Government, Government agencies and Government-sponsored enterprises	$	4,212	$	32	$	3,910	$	101
AAA	1,881		110		1,938		123
AA	8,911		750		8,919		900
A	9,866		832		10,044		904
BBB	12,802		664		11,595		307
Non-investment grade	3,233		156		3,166		(16		)
Total	$	40,905	$	2,544	$	39,572	$	2,319

As of December 31, 2016 and 2015, only 2% and 1% of our fixed maturity portfolio was rated internally.

The following table presents available-for-sale fixed maturity securities in a gross unrealized loss position by ratings distribution.

	December 31, 2016
(In millions)	Estimated Fair Value		Gross Unrealized Losses
U.S. Government, Government agencies and Government-sponsored enterprises	$	2,033	$	44
AAA	363		9
AA	744		20
A	851		22
BBB	2,791		74
Non-investment grade	766		23
Total	$	7,548	$	192

The following table presents the maturity profile for these available-for-sale fixed maturity securities. Securities not due to mature on a single date are allocated based on weighted average life.

	December 31, 2016
(In millions)	Estimated Fair Value		Gross Unrealized Losses
Due in one year or less	$	125	$	2
Due after one year through five years	909		12
Due after five years through ten years	4,775		109
Due after ten years	1,739		69
Total	$	7,548	$	192

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Duration

A primary objective in the management of the investment portfolio is to optimize return relative to corresponding liabilities and respective liquidity needs. Our views on the current interest rate environment, tax regulations, asset class valuations, specific security issuer and broader industry segment conditions and domestic and global economic conditions, are some of the factors that enter into an investment decision. We also continually monitor exposure to issuers of securities held and broader industry sector exposures and may from time to time adjust such exposures based on our views of a specific issuer or industry sector.

A further consideration in the management of the investment portfolio is the characteristics of the corresponding liabilities and the ability to align the duration of the portfolio to those liabilities and to meet future liquidity needs, minimize interest rate risk and maintain a level of income sufficient to support the underlying insurance liabilities. For portfolios where future liability cash flows are determinable and typically long term in nature, we segregate investments for asset/liability management purposes. The segregated investments support the long term care and structured settlement liabilities in the Life & Group Non-Core segment.

The effective durations of fixed maturity securities and short term investments are presented in following table. Amounts presented are net of payable and receivable amounts for securities purchased and sold, but not yet settled.

December 31	2016			2015
(In millions)	Estimated Fair Value		Effective Duration (In years)	Estimated Fair Value		Effective Duration (In years)
Investments supporting Life & Group Non-Core	$	15,724	8.7	$	14,879	9.6
Other interest sensitive investments	26,669		4.6	26,435		4.3
Total	$	42,393	6.1	$	41,314	6.2

The duration of the total fixed income portfolio is in line with portfolio targets. The duration of the assets supporting the Life and Group Non-Core business has declined, reflective of increases in expected bond call activity in our municipal bond portfolio and the low interest rate environment.

The investment portfolio is periodically analyzed for changes in duration and related price risk. Additionally, we periodically review the sensitivity of the portfolio to the level of foreign exchange rates and other factors that contribute to market price changes. A summary of these risks and specific analysis on changes is in Quantitative and Qualitative Disclosures About Market Risk included under Item 7A.

Short Term Investments

The carrying value of the components of the Short term investments are presented in the following table.

December 31
(In millions)	2016		2015
Short term investments:
Commercial paper	$	733	$	998
U.S. Treasury securities	433		411
Money market funds	44		60
Other	197		191
Total short term investments	$	1,407	$	1,660

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LIQUIDITY AND CAPITAL RESOURCES

Cash Flows

Our primary operating cash flow sources are premiums and investment income from our insurance subsidiaries. Our primary operating cash flow uses are payments for claims, policy benefits and operating expenses, including interest expense on corporate debt. Additionally, cash may be paid or received for income taxes.

For 2016, net cash provided by operating activities was $1,416 million as compared with $1,387 million and $1,440 million for 2015 and 2014, respectively. In 2016, cash provided by operating activities reflected lower income taxes paid and increased receipts relating to returns on limited partnerships offset by higher net claim and expense payments. Operating cash flows in 2015 reflected lower premiums collected and decreased receipts relating to returns on limited partnerships offset by lower net claim payments. Operating cash flows in 2014 reflected increased receipts relating to returns on limited partnerships and lower net claim payments, substantially offset by increased income tax payments.

Cash flows from investing activities include the purchase and disposition of available-for-sale financial instruments and may include the purchase and sale of businesses, land, buildings, equipment and other assets not generally held for resale.

Net cash used by investing activities was $846 million for 2016, as compared with $372 million and $918 million for 2015 and 2014. The cash flow from investing activities is affected by various factors such as the anticipated payment of claims, financing activity, asset/liability management and individual security buy and sell decisions made in the normal course of portfolio management. In the first quarter of 2016, we sold the principal executive offices of CNAF for $107 million.

Cash flows from financing activities may include proceeds from the issuance of debt and equity securities, outflows for stockholder dividends or repayment of debt and outlays to reacquire equity securities.

Net cash used by financing activities was $673 million, $807 million and $519 million for 2016, 2015 and 2014. In the first quarter of 2016, we issued $500 million of 4.50% senior notes due March 1, 2026 and redeemed the $350 million outstanding aggregate principal balance of our 6.50%senior notes due August 15, 2016.

Liquidity

We believe that our present cash flows from operations, investing activities and financing activities are sufficient to fund our current and expected working capital and debt obligation needs and we do not expect this to change in the near term. There are currently no amounts outstanding under our $250 million senior unsecured revolving credit facility and no borrowings outstanding through our membership in the Federal Home Loan Bank of Chicago (FHLBC).

CCC paid dividends of $765 million, $900 million and $650 million to CNAF during 2016, 2015 and 2014.

We have an effective automatic shelf registration statement under which we may publicly issue debt, equity or hybrid securities from time to time.

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Common Stock Dividends

Dividends of $3.00 per share on our common stock, including a special dividend of $2.00 per share, were declared and paid in 2016. On February 3, 2017, our Board of Directors declared a quarterly dividend of $0.25 per share and a special dividend of $2.00 per share, payable March 8, 2017 to stockholders of record on February 20, 2017. The declaration and payment of future dividends to holders of our common stock will be at the discretion of our Board of Directors and will depend on many factors, including our earnings, financial condition, business needs and regulatory constraints.

Our ability to pay dividends and other credit obligations is significantly dependent on receipt of dividends from our subsidiaries. The payment of dividends to us by our insurance subsidiaries without prior approval of the insurance department of each subsidiary's domiciliary jurisdiction is limited by formula. Dividends in excess of these amounts are subject to prior approval by the respective state insurance departments.

Further information on our dividends from subsidiaries is provided in Note M to the Consolidated Financial Statements included under Item 8.

Commitments, Contingencies and Guarantees

We have various commitments, contingencies and guarantees which arose in the ordinary course of business. The impact of these commitments, contingencies and guarantees should be considered when evaluating our liquidity and capital resources.

A summary of our commitments is presented in the following table.

December 31, 2016
(In millions)	Total		Less than 1 year			1-3 years			3-5 years		More than 5 years
Debt (a)	$	3,519	$	153		$	781		$	1,082	$	1,503
Lease obligations	426		48			67			67		244
Claim and claim adjustment expense reserves (b)	24,005		5,114			6,551			3,173		9,167
Future policy benefits reserves (c)	31,133		(422		)	(196		)	499		31,252
Total (d),(e)	$	59,083	$	4,893		$	7,203		$	4,821	$	42,166

(a) Includes estimated future interest payments.

(b) Claim and claim adjustment expense reserves are not discounted and represent our estimate of the amount and timing of the ultimate settlement and administration of gross claims based on our assessment of facts and circumstances known as of December 31, 2016. See the Reserves - Estimates and Uncertainties section of this MD&A for further information.

(c) Future policy benefits reserves are not discounted and represent our estimate of the ultimate amount and timing of the settlement of benefits based on our assessment of facts and circumstances known as of December 31, 2016. See the Reserves - Estimates and Uncertainties section of this MD&A for further information.

(d) Does not include expected estimated contribution of $15 million to our pension and postretirement plans in 2017.

(e) Does not include investment commitments of $530 million related to limited partnerships, privately placed debt securities and mortgage loans.

Further information on our commitments, contingencies and guarantees is provided in Notes A, B, E, F, H and I to the Consolidated Financial Statements included under Item 8.

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Ratings

Ratings are an important factor in establishing the competitive position of insurance companies. Our insurance company subsidiaries are rated by major rating agencies and these ratings reflect the rating agency's opinion of the insurance company's financial strength, operating performance, strategic position and ability to meet our obligations to policyholders. Agency ratings are not a recommendation to buy, sell or hold any security and may be revised or withdrawn at any time by the issuing organization. Each agency's rating should be evaluated independently of any other agency's rating. One or more of these agencies could take action in the future to change the ratings of our insurance subsidiaries.

The table below reflects the various group ratings issued by A.M. Best, Moody's and S&P. The table also includes the ratings for CNAF senior debt.

December 31, 2016	Insurance Financial Strength Ratings		Corporate Debt Ratings
	CCC Group	Western Surety Group	CNAF - Senior Debt
A.M. Best	A	A	bbb
Moody's	A3	Not rated	Baa2
S&P	A	A	BBB

A.M. Best, Moody’s and S&P each maintain a stable outlook on the Company.

CNA Insurance Company Limited is included within the CCC group as part of S&P’s rating. Hardy, through Syndicate 382, benefits from the collective financial strength of the Lloyd’s market, which is rated A+ by S&P with a stable outlook and A by A.M. Best with a stable outlook.

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ACCOUNTING STANDARDS UPDATE

For a discussion of Accounting Standards Updates adopted as of January 1, 2016 and that will be adopted in the future, see Note A to the Consolidated Financial Statements included under Item 8.

FORWARD-LOOKING STATEMENTS

This report contains a number of forward-looking statements which relate to anticipated future events rather than actual present conditions or historical events. These statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and generally include words such as “believes,” “expects,” “intends,” “anticipates,” “estimates,” and similar expressions. Forward-looking statements in this report include any and all statements regarding expected developments in our insurance business, including losses and loss reserves for A&EP and other mass tort claims which are more uncertain, and therefore more difficult to estimate than loss reserves respecting traditional property and casualty exposures; the impact of routine ongoing insurance reserve reviews we are conducting; our expectations concerning our revenues, earnings, expenses and investment activities; volatility in investment returns; expected cost savings and other results from our expense reduction activities; and our proposed actions in response to trends in our business. Forward-looking statements, by their nature, are subject to a variety of inherent risks and uncertainties that could cause actual results to differ materially from the results projected in the forward-looking statement. We cannot control many of these risks and uncertainties. These risks and uncertainties include, but are not limited to, the following:

Company-Specific Factors

• the risks and uncertainties associated with our insurance reserves, as outlined in the Critical Accounting Estimates and the Reserves - Estimates and Uncertainties sections of this report, including the sufficiency of the reserves and the possibility for future increases, which would be reflected in the results of operations in the period that the need for such adjustment is determined;

• the risk that the other parties to the transaction in which, subject to certain limitations, we ceded our legacy A&EP liabilities will not fully perform their obligations to CNA, the uncertainty in estimating loss reserves for A&EP liabilities and the possible continued exposure of CNA to liabilities for A&EP claims that are not covered under the terms of the transaction;

• the performance of reinsurance companies under reinsurance contracts with us; and

• the risks and uncertainties associated with potential acquisitions and divestitures, including the consummation of such transactions, the successful integration of acquired operations and the potential for subsequent impairment of goodwill or intangible assets.

Industry and General Market Factors

• the impact of competitive products, policies and pricing and the competitive environment in which we operate, including changes in our book of business;

• product and policy availability and demand and market responses, including the level of ability to obtain rate increases and decline or non-renew underpriced accounts, to achieve premium targets and profitability and to realize growth and retention estimates;

• general economic and business conditions, including recessionary conditions that may decrease the size and number of our insurance customers and create additional losses to our lines of business, especially those that provide management and professional liability insurance, as well as surety bonds, to businesses engaged in real estate, financial services and professional services and inflationary pressures on medical care costs, construction costs and other economic sectors that increase the severity of claims;

• conditions in the capital and credit markets, including continuing uncertainty and instability in these markets, as well as the overall economy, and their impact on the returns, types, liquidity and valuation of our investments;

• conditions in the capital and credit markets that may limit our ability to raise significant amounts of capital on favorable terms; and

• the possibility of changes in our ratings by ratings agencies, including the inability to access certain markets or distribution channels and the required collateralization of future payment obligations as a result of such changes, and changes in rating agency policies and practices.

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Regulatory Factors

• regulatory initiatives and compliance with governmental regulations, judicial interpretations within the regulatory framework, including interpretation of policy provisions, decisions regarding coverage and theories of liability, legislative actions that increase claimant activity, trends in litigation and the outcome of any litigation involving us and rulings and changes in tax laws and regulations;

• regulatory limitations, impositions and restrictions upon us, including with respect to our ability to increase premium rates, and the effects of assessments and other surcharges for guaranty funds and second-injury funds, other mandatory pooling arrangements and future assessments levied on insurance companies; and

• regulatory limitations and restrictions, including limitations upon our ability to receive dividends from our insurance subsidiaries, imposed by regulatory authorities, including regulatory capital adequacy standards.

Impact of Catastrophic Events and Related Developments

• weather and other natural physical events, including the severity and frequency of storms, hail, snowfall and other winter conditions, natural disasters such as hurricanes and earthquakes, as well as climate change, including effects on global weather patterns, greenhouse gases, sea, land and air temperatures, sea levels, rain, hail and snow;

• regulatory requirements imposed by coastal state regulators in the wake of hurricanes or other natural disasters, including limitations on the ability to exit markets or to non-renew, cancel or change terms and conditions in policies, as well as mandatory assessments to fund any shortfalls arising from the inability of quasi-governmental insurers to pay claims;

• man-made disasters, including the possible occurrence of terrorist attacks, the unpredictability of the nature, targets, severity or frequency of such events, and the effect of the absence or insufficiency of applicable terrorism legislation on coverages; and

• the occurrence of epidemics.

Referendum on the United Kingdom's Membership in the European Union

• on June 23, 2016, the United Kingdom (U.K.) held a referendum in which voters approved an exit from the European Union (E.U.), commonly referred to as "Brexit". As a result of the referendum, it is currently expected that the British government will formally commence the process to leave the E.U. and begin negotiating the terms of treaties that will govern the U.K.'s future relationship with the E.U. in the first quarter of 2017. Although the terms of any future treaties are unknown, changes in our international operating platform may be required to allow us to continue to write business in the E.U. after the completion of Brexit. As a result of these changes, the complexity and cost of regulatory compliance of our European business is likely to increase.

Our forward-looking statements speak only as of the date of the filing of this Annual Report on Form 10-K and we do not undertake any obligation to update or revise any forward-looking statement to reflect events or circumstances after the date of the statement, even if our expectations or any related events or circumstances change.

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ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our financial instruments are exposed to various market risks, such as interest rate risk, equity price risk and foreign currency risk. Due to the level of risk associated with certain invested assets and the level of uncertainty related to changes in the value of these assets, it is possible that changes in these risks in the near term could have a material adverse impact on our results of operations or equity.

Discussions herein regarding market risk focus on only one element of market risk, which is price risk. Price risk relates to changes in the level of prices due to changes in interest rates, equity prices, foreign exchange rates or other factors such as credit spreads. The fair value of our financial instruments is generally adversely affected when interest rates rise, equity markets decline or the dollar strengthens against foreign currency.

Active management of market risk is integral to our operations. We may take the following actions to manage our exposure to market risk within defined tolerance ranges: (1) change the character of future investments purchased or sold or (2) use derivatives to offset the market behavior of existing assets and liabilities or assets expected to be purchased and liabilities to be incurred.

Sensitivity Analysis

We monitor our sensitivity to interest rate changes by revaluing financial assets and liabilities using a variety of different interest rates. The Company uses duration and convexity at the security level to estimate the change in fair value that would result from a change in each security's yield. Duration measures the price sensitivity of an asset to changes in the yield rate. Convexity measures how the duration of the asset changes with interest rates. The duration and convexity analysis takes into account the unique characteristics (e.g., call and put options and prepayment expectations) of each security in determining the hypothetical change in fair value. The analysis is performed at the security level and aggregated up to the asset category levels for reporting in the tables below.

The evaluation is performed by applying an instantaneous change in yield rates of varying magnitudes on a static balance sheet to determine the effect such a change in rates would have on our fair value at risk and the resulting effect on stockholders' equity. The analysis presents the sensitivity of the fair value of our financial instruments to selected changes in capital market rates and index levels. The range of change chosen reflects our view of changes that are reasonably possible over a one-year period. The selection of the range of values chosen to represent changes in interest rates should not be construed as our prediction of future market events, but rather an illustration of the impact of such events.

The sensitivity analysis estimates the decline in the fair value of our interest sensitive assets and liabilities that were held as of December 31, 2016 and 2015 due to an instantaneous change in the yield of the security at the end of the period of 100 and 150 basis points, with all other variables held constant.

The sensitivity analysis also assumes an instantaneous 10% and 20% decline in the foreign currency exchange rates versus the United States dollar from their levels as of December 31, 2016 and 2015, with all other variables held constant.

Equity price risk was measured assuming an instantaneous 10% and 25% decline in the S&P 500 from its level as of December 31, 2016 and 2015, with all other variables held constant. Our equity holdings were assumed to be highly and positively correlated with the S&P 500 index.

The value of limited partnerships can be affected by changes in equity markets. A model was developed to analyze the observed changes in the value of limited partnerships held by the Company over a multiple year period along with the corresponding changes in the S&P 500 index. The result of the model allowed us to estimate the change in value of limited partnerships when equity markets decline by 10% and 25%, with all other variables held constant.

50

The following tables present the estimated effects on the fair value of our financial instruments as of December 31, 2016 and 2015, due to an increase in yield rates of 100 basis points, a 10% decline in foreign currency exchange rates and a 10% decline in the S&P 500, with all other variables held constant.

Market Risk Scenario 1

December 31, 2016			Increase (Decrease)
(In millions)	Estimated Fair Value		Interest Rate Risk			Foreign Currency Risk			Equity Price Risk
Assets:
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	18,958	$	(1,148	)	$	(151	)	$	—
States, municipalities and political subdivisions	13,240		(1,004		)	—			—
Asset-backed	8,138		(395		)	—			—
U.S. Treasury and obligations of government-sponsored enterprises	93		(2		)	—			—
Foreign government	445		(22		)	(38		)	—
Redeemable preferred stock	19		—			—			(1		)
Total fixed maturity securities available-for-sale	40,893		(2,571		)	(189		)	(1		)
Fixed maturity securities trading	12		—			—			—
Equity securities available-for-sale	110		(7		)	(1		)	(11		)
Limited partnership investments	2,371		—			—			(95		)
Other invested assets	36		—			(3		)	—
Mortgage loans (1)	594		(30		)	—			—
Short term investments	1,407		(1		)	(9		)	—
Total assets	45,423		(2,609		)	(202		)	(107		)
Derivative financial instruments, included in Other liabilities	3		13			—			—
Total securities	$	45,426	$	(2,596	)	$	(202	)	$	(107	)
Long term debt (1)	$	2,952	$	(137	)	$	—		$	—

(1)    Reported at amortized value in the Consolidated Balance Sheets included under Item 8 and not adjusted for fair value changes.

51

Market Risk Scenario 1

December 31, 2015			Increase (Decrease)
(In millions)	Estimated Fair Value		Interest Rate Risk			Foreign Currency Risk			Equity Price Risk
Assets:
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,757	$	(1,051	)	$	(153	)	$	—
States, municipalities and political subdivisions	13,174		(1,137		)	—			—
Asset-backed	8,190		(355		)	(2		)	—
U.S. Treasury and obligations of government-sponsored enterprises	67		(2		)	—			—
Foreign government	346		(16		)	(31		)	—
Redeemable preferred stock	35		—			—			(1		)
Total fixed maturity securities available-for-sale	39,569		(2,561		)	(186		)	(1		)
Fixed maturity securities trading	3		—			—			—
Equity securities available-for-sale	197		(8		)	(1		)	(20		)
Limited partnership investments	2,548		—			—			(115		)
Other invested assets	44		—			—			—
Mortgage loans (1)	688		(31		)	—			—
Short term investments	1,660		(2		)	(5		)	—
Total assets	44,709		(2,602		)	(192		)	(136		)
Derivative financial instruments, included in Other liabilities	5		13			—			—
Total securities	$	44,714	$	(2,589	)	$	(192	)	$	(136	)
Long term debt (1)	$	2,433	$	(117	)	$	—		$	—

(1)    Reported at amortized value in the Consolidated Balance Sheets included under Item 8 and not adjusted for fair value changes.

52

The following tables present the estimated effects on the fair value of our financial instruments as of December 31, 2016 and 2015, due to an increase in yield rates of 150 basis points, a 20% decline in foreign currency exchange rates and a 25% decline in the S&P 500, with all other variables held constant.

Market Risk Scenario 2

December 31, 2016			Increase (Decrease)
(In millions)	Estimated Fair Value		Interest Rate Risk			Foreign Currency Risk			Equity Price Risk
Assets:
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	18,958	$	(1,720	)	$	(302	)	$	—
States, municipalities and political subdivisions	13,240		(1,506		)	—			—
Asset-backed	8,138		(593		)	—			—
U.S. Treasury and obligations of government-sponsored enterprises	93		(3		)	—			—
Foreign government	445		(33		)	(77		)	—
Redeemable preferred stock	19		—			—			(2		)
Total fixed maturity securities available-for-sale	40,893		(3,855		)	(379		)	(2		)
Fixed maturity securities trading	12		—			—			—
Equity securities available-for-sale	110		(11		)	(3		)	(28		)
Limited partnership investments	2,371		—			—			(237		)
Other invested assets	36		—			(5		)	—
Mortgage loans (1)	594		(45		)	—			—
Short term investments	1,407		(2		)	(17		)	—
Total assets	45,423		(3,913		)	(404		)	(267		)
Derivative financial instruments, included in Other liabilities	3		20			—			—
Total securities	$	45,426	$	(3,893	)	$	(404	)	$	(267	)
Long term debt (1)	$	2,952	$	(205	)	$	—		$	—

(1)    Reported at amortized value in the Consolidated Balance Sheets included under Item 8 and not adjusted for fair value changes.

53

Market Risk Scenario 2

December 31, 2015			Increase (Decrease)
(In millions)	Estimated Fair Value		Interest Rate Risk			Foreign Currency Risk			Equity Price Risk
Assets:
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,757	$	(1,575	)	$	(307	)	$	—
States, municipalities and political subdivisions	13,174		(1,707		)	—			—
Asset-backed	8,190		(533		)	(3		)	—
U.S. Treasury and obligations of government-sponsored enterprises	67		(3		)	—			—
Foreign government	346		(24		)	(61		)	—
Redeemable preferred stock	35		(1		)	—			(4		)
Total fixed maturity securities available-for-sale	39,569		(3,843		)	(371		)	(4		)
Fixed maturity securities trading	3		—			—			—
Equity securities available-for-sale	197		(11		)	(3		)	(49		)
Limited partnership investments	2,548		—			—			(287		)
Other invested assets	44		—			—			—
Mortgage loans (1)	688		(47		)	—			—
Short term investments	1,660		(3		)	(9		)	—
Total assets	44,709		(3,904		)	(383		)	(340		)
Derivative financial instruments, included in Other liabilities	5		20			—			—
Total securities	$	44,714	$	(3,884	)	$	(383	)	$	(340	)
Long term debt (1)	$	2,433	$	(175	)	$	—		$	—

(1)    Reported at amortized value in the Consolidated Balance Sheets included under Item 8 and not adjusted for fair value changes.

54

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

CNA Financial Corporation

Consolidated Statements of Operations

Years ended December 31
(In millions, except per share data)	2016			2015			2014
Revenues
Net earned premiums	$	6,924		$	6,921		$	7,212
Net investment income	1,988			1,840			2,067
Net realized investment gains (losses):
Other-than-temporary impairment losses	(81		)	(156		)	(77		)
Other net realized investment gains	131			89			134
Net realized investment gains (losses)	50			(67		)	57
Other revenues	404			407			356
Total revenues	9,366			9,101			9,692
Claims, Benefits and Expenses
Insurance claims and policyholders’ benefits	5,283			5,384			5,591
Amortization of deferred acquisition costs	1,235			1,540			1,317
Other operating expenses	1,552			1,473			1,394
Interest	159			155			183
Total claims, benefits and expenses	8,229			8,552			8,485
Income from continuing operations before income tax	1,137			549			1,207
Income tax expense	(278		)	(70		)	(319		)
Income from continuing operations	859			479			888
Loss from discontinued operations, net of income tax benefit of$-, $- and $34	—			—			(197		)
Net income	$	859		$	479		$	691
Basic Earnings Per Share
Income from continuing operations	$	3.18		$	1.77		$	3.29
Loss from discontinued operations	—			—			(0.73		)
Basic earnings per share	$	3.18		$	1.77		$	2.56
Diluted Earnings Per Share
Income from continuing operations	$	3.17		$	1.77		$	3.28
Loss from discontinued operations	—			—			(0.73		)
Diluted earnings per share	$	3.17		$	1.77		$	2.55
Dividends declared per share	$	3.00		$	3.00		$	2.00
Weighted Average Outstanding Common Stock and Common Stock Equivalents
Basic	270.4			270.2			269.9
Diluted	271.1			270.7			270.6

The accompanying Notes are an integral part of these Consolidated Financial Statements.

55

CNA Financial Corporation

Consolidated Statements of Comprehensive Income (Loss)

Years ended December 31
(In millions)	2016			2015			2014
Comprehensive Income
Net income	$	859		$	479		$	691
Other Comprehensive Income (Loss), Net of Tax
Changes in:
Net unrealized gains on investments with other-than-temporary impairments	3			(9		)	15
Net unrealized gains on other investments	252			(552		)	267
Net unrealized gains on investments	255			(561		)	282
Net unrealized losses on discontinued operations	—			—			(22		)
Foreign currency translation adjustment	(114		)	(139		)	(95		)
Pension and postretirement benefits	1			(15		)	(207		)
Other comprehensive income (loss), net of tax	142			(715		)	(42		)
Total comprehensive income (loss)	$	1,001		$	(236	)	$	649

The accompanying Notes are an integral part of these Consolidated Financial Statements.

56

CNA Financial Corporation

Consolidated Balance Sheets

December 31
(In millions, except share data)	2016			2015
Assets
Investments:
Fixed maturity securities at fair value (amortized cost of $38,361 and $37,253)	$	40,905		$	39,572
Equity securities at fair value (cost of $106 and $191)	110			197
Limited partnership investments	2,371			2,548
Other invested assets	36			44
Mortgage loans	591			678
Short term investments	1,407			1,660
Total investments	45,420			44,699
Cash	271			387
Reinsurance receivables (less allowance for uncollectible receivables of $37 and $38)	4,416			4,453
Insurance receivables (less allowance for uncollectible receivables of $46 and $51)	2,209			2,078
Accrued investment income	405			404
Deferred acquisition costs	600			598
Deferred income taxes	379			638
Property and equipment at cost (less accumulated depreciation of $254 and $382)	310			343
Goodwill	145			150
Other assets	1,078			1,295
Total assets	$	55,233		$	55,045
Liabilities
Insurance reserves:
Claim and claim adjustment expenses	$	22,343		$	22,663
Unearned premiums	3,762			3,671
Future policy benefits	10,326			10,152
Short term debt	—			350
Long term debt	2,710			2,210
Other liabilities (includes $50 and $82 due to Loews Corporation)	4,123			4,243
Total liabilities	43,264			43,289
Commitments and contingencies (Notes B, F and L)
Stockholders' Equity
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,495,998 and 270,274,361 shares outstanding)	683			683
Additional paid-in capital	2,173			2,153
Retained earnings	9,359			9,313
Accumulated other comprehensive income	(173		)	(315		)
Treasury stock (2,544,245 and 2,765,882 shares), at cost	(73		)	(78		)
Total stockholders’ equity	11,969			11,756
Total liabilities and stockholders' equity	$	55,233		$	55,045

The accompanying Notes are an integral part of these Consolidated Financial Statements.

57

CNA Financial Corporation

Consolidated Statements of Cash Flows

Years ended December 31
(In millions)	2016			2015			2014
Cash Flows from Operating Activities
Net income	$	859		$	479		$	691
Adjustments to reconcile net income to net cash flows provided by operating activities:
Loss on sale of subsidiaries	—			—			251
Deferred income tax expense (benefit)	136			(150		)	3
Trading portfolio activity	(9		)	17			16
Net realized investment(gains) losses	(50		)	67			(60		)
Equity method investees	238			195			83
Net amortization of investments	(27		)	17			3
Depreciation and amortization	77			84			83
Changes in:
Receivables, net	(130		)	82			731
Accrued investment income	(3		)	(1		)	—
Deferred acquisition costs	(8		)	311			44
Insurance reserves	237			241			(363		)
Other assets	(95		)	(79		)	(48		)
Other liabilities	162			126			(48		)
Other, net	29			(2		)	54
Total adjustments	557			908			749
Net cash flows provided by operating activities	1,416			1,387			1,440
Cash Flows from Investing Activities
Dispositions:
Fixed maturity securities - sales	5,328			4,390			4,914
Fixed maturity securities - maturities, calls and redemptions	3,219			4,095			3,983
Equity securities	81			57			31
Limited partnerships	290			174			167
Mortgage loans	207			26			57
Purchases:
Fixed maturity securities	(9,827		)	(8,675		)	(9,365		)
Equity securities	—			(62		)	(67		)
Limited partnerships	(252		)	(188		)	(271		)
Mortgage loans	(120		)	(123		)	(137		)
Change in other investments	7			4			15
Change in short term investments	258			34			(388		)
Purchases of property and equipment	(146		)	(125		)	(71		)
Disposals of property and equipment	107			—			—
Proceeds from sale of subsidiaries	—			—			198
Other, net	2			21			16
Net cash flows (used) by investing activities	$	(846	)	$	(372	)	$	(918	)

The accompanying Notes are an integral part of these Consolidated Financial Statements.

58

Years ended December 31
(In millions)	2016			2015			2014
Cash Flows from Financing Activities
Dividends paid to common stockholders	$	(813	)	$	(811	)	$	(541	)
Proceeds from the issuance of debt	498			—			546
Repayment of debt	(358		)	—			(549		)
Other, net	—			4			25
Net cash flows (used) by financing activities	(673		)	(807		)	(519		)
Effect of foreign exchange rate changes on cash	(13		)	(11		)	(8		)
Net change in cash	(116		)	197			(5		)
Cash, beginning of year	387			190			195
Cash, end of year	$	271		$	387		$	190

The accompanying Notes are an integral part of these Consolidated Financial Statements.

59

CNA Financial Corporation

Consolidated Statements of Stockholders' Equity

Years ended December 31
(In millions)	2016			2015			2014
Common Stock
Balance, beginning of year	$	683		$	683		$	683
Balance, end of year	683			683			683
Additional Paid-in Capital
Balance, beginning of year	2,153			2,151			2,145
Stock-based compensation	20			2			6
Balance, end of year	2,173			2,153			2,151
Retained Earnings
Balance, beginning of year	9,313			9,645			9,495
Dividends paid to common stockholders	(813		)	(811		)	(541		)
Net income	859			479			691
Balance, end of year	9,359			9,313			9,645
Accumulated Other Comprehensive Income (Loss)
Balance, beginning of year	(315		)	400			442
Other comprehensive income (loss)	142			(715		)	(42		)
Balance, end of year	(173		)	(315		)	400
Treasury Stock
Balance, beginning of year	(78		)	(84		)	(91		)
Stock-based compensation	5			6			7
Balance, end of year	(73		)	(78		)	(84		)
Notes Receivable for the Issuance of Common Stock
Balance, beginning of year	—			(1		)	(23		)
Decreasein notes receivable for common stock	—			1			22
Balance, end of year	—			—			(1		)
Total stockholders' equity	$	11,969		$	11,756		$	12,794

The accompanying Notes are an integral part of these Consolidated Financial Statements.

60

CNA Financial Corporation

Notes to Consolidated Financial Statements

Note A. Summary of Significant Accounting Policies

Basis of Presentation

The Consolidated Financial Statements include the accounts of CNA Financial Corporation (CNAF) and its subsidiaries. Collectively, CNAF and its subsidiaries are referred to as CNA or the Company. Loews Corporation (Loews) owned approximately 90% of the outstanding common stock of CNAF as of December 31, 2016.

The accompanying Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). Intercompany amounts have been eliminated. The preparation of Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

Sale of Continental Assurance Company (CAC)

On August 1, 2014, the Company completed the sale of CAC. The business sold, which was previously reported within the Life & Group Non-Core segment, is reported as discontinued operations. The Company elected to include CAC cash flow activity in the comparative Consolidated Statements of Cash Flow. Further information related to the sale of CAC is provided in Note P to the Consolidated Financial Statements.

In connection with the sale of CAC, the Company entered into a 100% coinsurance agreement on a separate small block of annuity business outside of CAC. The coinsurance agreement required the transfer of assets with a book value equal to the ceded reserves on the inception date of the contract. Because a substantial portion of the assets supporting these liabilities are held in trust for the benefit of the original cedant, those assets were transferred on a funds withheld basis. Under this approach the Company maintains legal ownership of the assets, but the investment income and realized gains and losses on those assets inure to the reinsurer. As a result, the $34 million difference between market value and book value of the funds withheld assets at the coinsurance contract's inception was recognized as a loss in Other operating expenses in 2014. The funds withheld aspect of the agreement is considered an embedded derivative. The embedded derivative is separately accounted for at fair value and reported with the host contract in Other liabilities on the Company's Consolidated Balance Sheet. The Company recognizes Other operating expense equal to the Net investment income generated by these trust assets.

Insurance Operations

Premiums: Insurance premiums on property and casualty insurance contracts are recognized in proportion to the underlying risk insured and are principally earned ratably over the duration of the policies. Premiums on long term care contracts are earned ratably over the policy year in which they are due. The reserve for unearned premiums represents the portion of premiums written relating to the unexpired terms of coverage.

Insurance receivables include balances due currently or in the future, including amounts due from insureds related to losses under high deductible policies, and are presented at unpaid balances, net of an allowance for uncollectible receivables. Amounts are considered past due based on policy payment terms. The allowance is determined based on periodic evaluations of aged receivables, management's experience and current economic conditions. Insurance receivables and any related allowance are written off after collection efforts are exhausted or a negotiated settlement is reached.

Property and casualty contracts that are retrospectively rated contain provisions that result in an adjustment to the initial policy premium depending on the contract provisions and loss experience of the insured during the experience period. For such contracts, the Company estimates the amount of ultimate premiums that the Company may earn upon completion of the experience period and recognizes either an asset or a liability for the difference between the initial policy premium and the estimated ultimate premium. The Company adjusts such estimated ultimate premium amounts during the course of the experience period based on actual results to date. The resulting adjustment is recorded as either a reduction of or an increase to the earned premiums for the period.

61

Claim and claim adjustment expense reserves: Claim and claim adjustment expense reserves, except reserves for structured settlements not associated with asbestos and environmental pollution (A&EP), workers' compensation lifetime claims and long term care claims, are not discounted and are based on 1) case basis estimates for losses reported on direct business, adjusted in the aggregate for ultimate loss expectations; 2) estimates of incurred but not reported (IBNR) losses; 3) estimates of losses on assumed reinsurance; 4) estimates of future expenses to be incurred in the settlement of claims; 5) estimates of salvage and subrogation recoveries and 6) estimates of amounts due from insureds related to losses under high deductible policies. Management considers current conditions and trends as well as past Company and industry experience in establishing these estimates. The effects of inflation, which can be significant, are implicitly considered in the reserving process and are part of the recorded reserve balance. Ceded claim and claim adjustment expense reserves are reported as a component of Reinsurance receivables on the Consolidated Balance Sheets.

Claim and claim adjustment expense reserves are presented net of anticipated amounts due from insureds related to losses under deductible policies of $1.2 billion and $1.2 billion as of December 31, 2016 and 2015. A significant portion of these amounts are supported by collateral. The Company has an allowance for uncollectible deductible amounts, which is presented as a component of the allowance for doubtful accounts included in Insurance receivables onthe Consolidated Balance Sheets.

Structured settlements have been negotiated for certain property and casualty insurance claims. Structured settlements are agreements to provide fixed periodic payments to claimants. The Company's obligations for structured settlements not funded by annuities are included in claim and claim adjustment expense reserves and carried at present values determined using interest rates ranging from to 5.5% to 8.0% as of December 31, 2016 and 2015. As of December 31, 2016 and 2015, the discounted reserves for unfunded structured settlements were $544 million and $560 million, net of discount of $841 million and $880 million. For the years ended December 31, 2016, 2015 and 2014, the amount of interest recognized on the discounted reserves of unfunded structured settlements was $42 million, $42 million and $43 million, respectively. This interest accretion is presented as a component of Insurance claims and policyholders’ benefits on the Consolidated Statements of Operations, but is excluded from the Company’s disclosure of prior year development.

Workers' compensation lifetime claim reserves are calculated using mortality assumptions determined through statutory regulation and economic factors. At December 31, 2016 and 2015, workers' compensation lifetime claim reserves are discounted at a 3.5% interest rate. As of December 31, 2016 and 2015, the discounted reserves for workers’ compensation lifetime claim reserves were $371 million and $396 million, net of discount of $202 million and $218 million. For the years ended December 31, 2016, 2015 and 2014 the amount of interest accretion recognized on the discounted reserves of workers’ compensation lifetime claim reserves was $17 million, $20 million and $22 million, respectively.

Long term care claim reserves are calculated using mortality and morbidity assumptions based on Company and industry experience. Long term care claim reserves are discounted at interest rates ranging from 4.5% to 6.8% as of December 31, 2016 and 2015. As of December 31, 2016 and 2015, such discounted reserves totaled $2.2 billion and $2.2 billion, net of discount of $529 million and $435 million.

Future policy benefits reserves: Future policy benefits reserves represent the active life reserves related to the Company's long term care policies and are computed using the net level premium method, which incorporates actuarial assumptions as to morbidity, persistency, discount rate and expenses. Expense assumptions primarily relate to claim adjudication. Actuarial assumptions generally vary by plan, age at issue, policy duration and gender. The initial assumptions are determined at issuance, include a margin for adverse deviation and are locked in throughout the life of the contract unless a premium deficiency develops. If a premium deficiency emerges, the assumptions are unlocked and deferred acquisition costs, if any, and the future policy benefits reserves are adjusted. The December 31, 2015 gross premium valuation (GPV) indicated a premium deficiency of $296 million. The indicated premium deficiency necessitated a charge to income that was affected by the write off of the entire long term care deferred acquisition cost asset of $289 million and an increase to active life reserves of $7 million. As a result, the long term care active life reserves carried as of December 31, 2015 represent management’s best estimate assumptions at that date with no margin for adverse deviation. The December 31, 2016 GPV indicated the carried reserves were sufficient, therefore there was no unlocking of assumptions. Interest rates for long term care active life reserves range from 6.6% to 7.0% as of December 31, 2016 and 2015.

62

Guaranty fund and other insurance-related assessments: Liabilities for guaranty fund and other insurance-related assessments are accrued when an assessment is probable, when it can be reasonably estimated and when the event obligating the entity to pay an imposed or probable assessment has occurred. Liabilities for guaranty funds and other insurance-related assessments are not discounted and are included as part of Other liabilities on the Consolidated Balance Sheets. As of December 31, 2016 and 2015, the liability balances were $125 million and $129 million.

Reinsurance: Reinsurance accounting allows for contractual cash flows to be reflected as premiums and losses. To qualify for reinsurance accounting, reinsurance agreements must include risk transfer. To meet risk transfer requirements, a reinsurance contract must include both insurance risk, consisting of underwriting and timing risk, and a reasonable possibility of a significant loss for the assuming entity.

Reinsurance receivables related to paid losses are presented at unpaid balances. Reinsurance receivables related to unpaid losses are estimated in a manner consistent with claim and claim adjustment expense reserves or future policy benefits reserves. Reinsurance receivables are reported net of an allowance for uncollectible amounts on the Consolidated Balance Sheets. The cost of reinsurance is primarily accounted for over the life of the underlying reinsured policies using assumptions consistent with those used to account for the underlying policies or over the reinsurance contract period. The ceding of insurance does not discharge the primary liability of the Company.

The Company has established an allowance for uncollectible reinsurance receivables which relates to both amounts already billed on ceded paid losses as well as ceded reserves that will be billed when losses are paid in the future. The allowance for uncollectible reinsurance receivables is estimated on the basis of periodic evaluations of balances due from reinsurers, reinsurer solvency, management's experience and current economic conditions. Reinsurer financial strength ratings are updated and reviewed on an annual basis or sooner if the Company becomes aware of significant changes related to a reinsurer. Because billed receivables generally approximate 3% or less of total reinsurance receivables, the age of the reinsurance receivables related to paid losses is not a significant input into the allowance analysis. Changes in the allowance for uncollectible reinsurance receivables are presented as a component of Insurance claims and policyholders' benefits on the Consolidated Statements of Operations.

Amounts are considered past due based on the reinsurance contract terms. Reinsurance receivables related to paid losses and any related allowance are written off after collection efforts have been exhausted or a negotiated settlement is reached with the reinsurer. Reinsurance receivables related to paid losses from insolvent insurers are written off when the settlement due from the estate can be reasonably estimated. At the time reinsurance receivables related to paid losses are written off, any required adjustment to reinsurance receivables related to unpaid losses is recorded as a component of Insurance claims and policyholders' benefits on the Consolidated Statements of Operations.

Reinsurance contracts that do not effectively transfer the economic risk of loss on the underlying policies are recorded using the deposit method of accounting, which requires that premium paid or received by the ceding company or assuming company be accounted for as a deposit asset or liability. The Company had $3 million recorded as deposit assets as of December 31, 2016 and 2015, and $6 million and $8 million recorded as deposit liabilities as of December 31, 2016 and 2015. Income on reinsurance contracts accounted for under the deposit method is recognized using an effective yield based on the anticipated timing of payments and the remaining life of the contract. When the anticipated timing of payments changes, the effective yield is recalculated to reflect actual payments to date and the estimated timing of future payments. The deposit asset or liability is adjusted to the amount that would have existed had the new effective yield been applied since the inception of the contract.

A loss portfolio transfer is a retroactive reinsurance contract. If the cumulative claim and allocated claim adjustment expenses ceded under a loss portfolio transfer exceed the consideration paid, the resulting gain from such excess is deferred and amortized into earnings in future periods in proportion to actual recoveries under the loss portfolio transfer. In any period in which there is a gain position and a revised estimate of claim and allocated claim adjustment expenses, a portion of the deferred gain is cumulatively recognized in earnings as if the revised estimate was available at the inception date of the loss portfolio transfer.

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Deferred acquisition costs: Deferrable acquisition costs include commissions, premium taxes and certain underwriting and policy issuance costs which are incremental direct costs of successful contract acquisitions. Acquisition costs related to property and casualty business are deferred and amortized ratably over the period the related premiums are earned. Deferred acquisition costs are presented net of ceding commissions and other ceded acquisition costs.

The Company evaluates deferred acquisition costs for recoverability. Anticipated investment income is considered in the determination of the recoverability of deferred acquisition costs. Adjustments, if necessary, are recorded in current period results of operations.

Deferred acquisition costs related to long term care contracts issued prior to January 1, 2004 include costs which vary with and are primarily related to the acquisition of business. As noted under Future policy benefits reserves, all of the long term care deferred acquisition costs of $289 million were written off as of December 31, 2015 in recognition of a premium deficiency.

Investments in life settlement contracts and related revenue recognition: Prior to 2002, the Company purchased investments in life settlement contracts. The Company obtained the ownership and beneficiary rights of an underlying life insurance policy through a life settlement contract with the owner of the life insurance contract.

The Company accounts for its investments in life settlement contracts using the fair value method. Under the fair value method, each life settlement contract is carried at its fair value at the end of each reporting period. The change in fair value estimated through the Company's internal valuation process, life insurance proceeds received and periodic maintenance costs, such as premiums, necessary to keep the underlying policy in force, are recorded in Other revenues on the Consolidated Statements of Operations.

In December 2016, the Company reached agreement on terms to sell the entire portfolio of life settlement contracts to a third party. The Company expects to consummate this transaction in 2017. As a result, the portfolio, which is included within Life & Group Non-Core segment, was determined to be held for sale as of December 31, 2016. Therefore, the contracts were measured at the lower of the carrying amount or the fair value per the agreed terms. This resulted in a $10 million loss recognized within Net realized investment gains. The fair value of the Company's investments in life settlement contracts were $58 million and $74 million as of December 31, 2016 and 2015, and are included in Other assets on the Consolidated Balance Sheets. The cash receipts and payments related to life settlement contracts are included in Cash flows from operating activities on the Consolidated Statements of Cash Flows.

The following table details the values for life settlement contracts. The determination of fair value is discussed in Note C to the Consolidated Financial Statements.

December 31, 2016	Number of Life Settlement Contracts	Fair Value of Life Settlement Contracts (In millions)		Face Amount of Life Insurance Policies (In millions)
Estimated settlements during:
2017	63	$	10	$	34
2018	55	8		30
2019	49	7		26
2020	43	6		23
2021	36	4		19
Thereafter	280	23		153
Total	526	$	58	$	285

The Company uses an actuarial model to estimate the aggregate face amount of life insurance that are expected to settle in each future year and the corresponding fair value. This model projects the likelihood of the insured's death for each inforce policy based upon the Company's estimated mortality rates, which may vary due to the relatively small size of the portfolio of life settlement contracts. The number of life settlement contracts presented in the table above is based upon the average face amount of inforce policies estimated to settle in each future year.

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The increase in fair value recognized in Other revenues for the years ended December 31, 2016, 2015 and 2014 on contracts still held at each respective period-end was $7 million, $1 million and $8 million. The gains recognized during the years ended December 31, 2016, 2015 and 2014 on contracts that settled were $8 million, $24 million and $25 million.

Investments

The Company classifies its fixed maturity securities and its equity securities as either available-for-sale or trading, and as such, they are carried at fair value. Changes in fair value of trading securities are reported within Net investment income on the Consolidated Statements of Operations. Changes in fair value related to available-for-sale securities are reported as a component of Other comprehensive income. Losses may be recognized within Net realized investment gains (losses) on the Consolidated Statements of Operations when a decline in value is determined by the Company to be other-than-temporary.

The cost of fixed maturity securities classified as available-for-sale is adjusted for amortization of premiums and accretion of discounts, which are included in Net investment income on the Consolidated Statements of Operations. The amortization of premium and accretion of discount for fixed maturity securities takes into consideration call and maturity dates that produce the lowest yield. In 2015 the Company changed its accounting principle as previously the amortization of premiums was to maturity. This change in estimate effected by a change in accounting principle was adopted in the fourth quarter of 2015 and decreased Net investment income and the amortized cost of fixed maturity securities by $39 million in the Consolidated Statement of Operations for the year-ended December 31, 2015 and the Consolidated Balance Sheet as of December 31, 2015. The $39 million decrease to Net investment income included a $22 million cumulative adjustment relating to prior periods. The total adjustment decreased Basic and Diluted earnings per share by $0.09 for the year ended December 31, 2015.

To the extent that unrealized gains on fixed income securities supporting long term care products and structured settlements not funded by annuities would result in a premium deficiency if those gains were realized, a related increase in Insurance reserves is recorded, net of tax, as a reduction of net unrealized gains through Other comprehensive income (Shadow Adjustments). Shadow Adjustments, net of tax, decreased $97 million and $177 million for the years ended December 31, 2016 and 2015. As of December 31, 2016 and 2015, net unrealized gains on investments included in Accumulated other comprehensive income (AOCI) were correspondingly reduced by Shadow Adjustments of $1,014 million and $1,111 million.

For asset-backed securities included in fixed maturity securities, the Company recognizes income using an effective yield based on anticipated prepayments and the estimated economic life of the securities. When estimates of prepayments change, the effective yield is recalculated to reflect actual payments to date and anticipated future payments. The amortized cost of high credit quality fixed rate securities is adjusted to the amount that would have existed had the new effective yield been applied since the acquisition of the securities. Such adjustments are reflected in Net investment income on the Consolidated Statements of Operations. Interest income on lower rated and variable rate securities is determined using the prospective yield method.

The Company's carrying value of investments in limited partnerships is its share of the net asset value of each partnership, as determined by the general partner. Certain partnerships for which results are not available on a timely basis are reported on a lag, primarily three months or less. Changes in net asset values are accounted for under the equity method and recorded within Net investment income on the Consolidated Statements of Operations.

Mortgage loans are commercial in nature, are carried at unpaid principal balance, net of unamortized fees and any valuation allowance, and are recorded once funded. Mortgage loans are considered to be impaired loans when it is probable that contractual principal and interest payments will not be collected. A valuation allowance is established for impaired loans to the extent that the present value of expected future cash flows discounted at the loan's original effective interest rate is less than the carrying value of the loan. Interest income from mortgage loans is recognized on an accrual basis using the effective yield method. Accrual of income is generally suspended for mortgage loans that are impaired and collection of principal and interest payments is unlikely. Mortgage loans are considered past due when full principal or interest payments have not been received according to contractual terms.

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Other invested assets include overseas deposits and Federal Home Loan Bank of Chicago (FHLBC) stock. FHLBC stock is carried at fair value. Overseas deposits are valued using the net asset value per share (or equivalent) practical expedient. They are primarily short-term government securities, agency securities and corporate bonds held in trusts that are managed by Lloyd's of London. These funds are required of Lloyd's syndicates to protect policyholders in overseas markets and may be denominated in local currency.

Short term investments are carried at fair value, with the exception of cash accounts earning interest, which are carried at cost and approximate fair value. Changes in fair value are reported as a component of Other comprehensive income.

Purchases and sales of all securities are recorded on the trade date, except for private placement debt securities, including bank loan participations, which are recorded once funded. Realized investment gains and losses are determined on the basis of the cost or amortized cost of the specific securities sold.

In the normal course of investing activities, the Company enters into relationships with variable interest entities (VIEs), as both an investor in limited partnerships and asset-backed securities issued by third-party VIEs. The Company is not the primary beneficiary of these VIEs, and therefore does not consolidate them. The Company determines whether it is the primary beneficiary of a VIE based on a qualitative assessment of the relative power and benefits of the Company and our venture partners. The Company’s maximum exposure to loss with respect to these investments is limited to the investment carrying values included in the Company’s Consolidated Balance Sheets and any unfunded commitments.

A security is impaired if the fair value of the security is less than its cost adjusted for accretion, amortization and previously recorded other-than-temporary impairment (OTTI) losses, otherwise defined as an unrealized loss. When a security is impaired, the impairment is evaluated to determine whether it is temporary or other-than-temporary.

Significant judgment is required in the determination of whether an OTTI loss has occurred for a security. The Company follows a consistent and systematic process for determining and recording an OTTI loss. The Company has established a committee responsible for the OTTI process referred to as the Impairment Committee. The Impairment Committee is responsible for evaluating all securities in an unrealized loss position on at least a quarterly basis.

The Impairment Committee’s assessment of whether an OTTI loss has occurred incorporates both quantitative and qualitative information. Fixed maturity securities that the Company intends to sell, or it more likely than not will be required to sell before recovery of amortized cost, are considered to be other-than-temporarily impaired and the entire difference between the amortized cost basis and fair value of the security is recognized as an OTTI loss in earnings. The remaining fixed maturity securities in an unrealized loss position are evaluated to determine if a credit loss exists. The factors considered by the Impairment Committee include (a) the financial condition and near-term and long-term prospects of the issuer, (b) whether the debtor is current on interest and principal payments, (c) credit ratings of the securities and (d) general market conditions and industry or sector specific outlook. The Company also considers results and analysis of cash flow modeling for asset-backed securities, and when appropriate, other fixed maturity securities. The focus of the analysis for asset-backed securities is on assessing the sufficiency and quality of underlying collateral and timing of cash flows based on scenario tests. If the present value of the modeled expected cash flows equals or exceeds the amortized cost of a security, no credit loss is judged to exist and the asset-backed security is deemed to be temporarily impaired. If the present value of the expected cash flows is significantly less than amortized cost, the security is judged to be other-than-temporarily impaired for credit reasons and that shortfall, referred to as the credit component, is recognized as an OTTI loss in earnings. The difference between the adjusted amortized cost basis and fair value, referred to as the non-credit component, is recognized as OTTI in Other comprehensive income. In subsequent reporting periods, a change in intent to sell or further credit impairment on a security whose fair value has not deteriorated will cause the non-credit component originally recorded as OTTI in Other comprehensive income to be recognized as an OTTI loss in earnings. The Company performs the discounted cash flow analysis using stressed scenarios to determine future expectations regarding recoverability. Significant assumptions enter into these cash flow projections including delinquency rates, probable risk of default, loss severity upon a default, over collateralization and interest coverage triggers and credit support from lower level tranches.

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The Company applies the same impairment model as described above for the majority of its non-redeemable preferred stock securities on the basis that these securities possess characteristics similar to debt securities and that the issuers maintain their ability to pay dividends. For all other equity securities, in determining whether the security is other-than-temporarily impaired, the Impairment Committee considers a number of factors including, but not limited to: (a) the length of time and the extent to which the fair value has been less than amortized cost, (b) the financial condition and near term prospects of the issuer, (c) the intent and ability of the Company to retain its investment for a period of time sufficient to allow for an anticipated recovery in value and (d) general market conditions and industry or sector specific outlook.

Income Taxes

The Company and its eligible subsidiaries (CNA Tax Group) are included in the consolidated federal income tax return of Loews and its eligible subsidiaries. The Company accounts for income taxes under the asset and liability method. Under the asset and liability method, deferred income taxes are recognized for temporary differences between the financial statement and tax return bases of assets and liabilities, based on enacted tax rates and other provisions of the tax law. The effect of a change in tax laws or rates on deferred tax assets and liabilities is recognized in income in the period in which such change is enacted. Future tax benefits are recognized to the extent that realization of such benefits is more likely than not, and a valuation allowance is established for any portion of a deferred tax asset that management believes will not be realized.

Pension and Postretirement Benefits

The Company recognizes the overfunded or underfunded status of its defined benefit plans in Other assets or Other liabilities on the Consolidated Balance Sheets. Changes in funded status related to prior service costs and credits and actuarial gains and losses are recognized in the year in which the changes occur through Other comprehensive income. Annual service cost, interest cost, expected return on plan assets, amortization of prior service costs and credits and amortization of actuarial gains and losses are recognized in the Consolidated Statements of Operations. The vested benefit obligation for the CNA Retirement Plan is determined based on eligible compensation and accrued service for previously entitled employees. Effective June 30, 2015, future benefit accruals under the CNA Retirement Plan were eliminated and the benefit obligations were frozen.

Stock-Based Compensation

The Company records compensation expense using the fair value method for all awards it grants, modifies or cancels primarily on a straight-line basis over the requisite service period, generally three to four years.

Foreign Currency

Foreign currency translation gains and losses are reflected in Stockholders' equity as a component of AOCI. The Company's foreign subsidiaries' balance sheet accounts are translated at the exchange rates in effect at each reporting date and income statement accounts are either translated at the exchange rate on the date of the transaction or at the average exchange rates. Foreign currency transaction gains (losses) of $(9) million, $(11) million and $(25) million were included in determining Net income (loss) for the years ended December 31, 2016, 2015 and 2014.

Property and Equipment

Property and equipment are carried at cost less accumulated depreciation. Depreciation is based on the estimated useful lives of the various classes of property and equipment and is determined principally on the straight-line method. Furniture and fixtures are depreciated over seven years. Office equipment is depreciated over five years. The estimated lives for data processing equipment and software generally range from three to five years, but can be as long as ten years. Leasehold improvements are depreciated over the corresponding lease terms not to exceed the underlying asset life. The Company's previously owned building and related capital improvements were depreciated over periods not to exceed fifty years.

Goodwill

Goodwill represents the excess of purchase price over the fair value of the net assets of acquired entities and businesses. Goodwill in the International segment may change from period to period as a result of foreign currency translation.

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Goodwill is tested for impairment annually or when certain triggering events require such tests. As a result of reviews completed for the year ended December 31, 2016, the Company determined that the estimated fair value of the reporting units were in excess of their carrying value including Goodwill. Changes in future periods in assumptions about the level of economic capital, business growth, earnings projections or the weighted average cost of capital could result in a goodwill impairment.

Other Intangible Assets

Other intangible assets are reported within Other assets.Finite-lived intangible assets are amortized over their estimated useful lives. Indefinite-lived other intangible assets are tested for impairment annually or when certain triggering events require such tests.

Earnings (Loss) Per Share Data

Earnings (loss) per share is based on weighted average number of outstanding common shares. Basic earnings (loss) per share excludes the impact of dilutive securities and is computed by dividing Net income (loss) by the weighted average number of common shares outstanding for the period. Diluted earnings (loss) per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock.

For the years ended December 31, 2016, 2015 and 2014, approximately 678 thousand, 534 thousand and 675 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were included in the calculation of diluted earnings per share. For those same periods, approximately 102 thousand, 106 thousand and 170 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were not included in the calculation of diluted earnings per share because the effect would have been antidilutive.

Supplementary Cash Flow Information

Cash payments made for interest were $157 million, $152 million and $179 million for the years ended December 31, 2016, 2015 and 2014. Cash payments made for income taxes were $170 million, $310 million and $313 million for the years ended December 31, 2016, 2015 and 2014.

Recently Adopted Accounting Standards Updates (ASU)

In April 2015, the Financial Accounting Standards Board (FASB) issued ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The updated accounting guidance requires debt issuance costs to be presented as a deduction from the corresponding debt liability instead of the historical presentation as an unamortized debt issuance asset. As of January 1, 2016, the Company adopted the updated accounting guidance retrospectively. The Company adjusted its previously reported financial information included herein to reflect the change in accounting guidance for debt issuance costs. The impacts of adopting the new accounting standard on the Company’s Consolidated Balance Sheet as of December 31, 2015, were a decrease in Other assets and a decrease in Long term debt of $2 million.

In May 2015, the FASB issued ASU No. 2015-09, Financial Services-Insurance (Topic 944): Disclosures about Short-Duration Contracts. The updated accounting guidance requires enhanced disclosures to provide additional information about insurance liabilities for short-duration contracts. The updated guidance is effective for annual financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within the annual periods beginning after December 15, 2016. The Company has adopted the change in disclosure requirements for short-duration contracts.

In May 2015, the FASB issued ASU No. 2015-07, Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent). The updated accounting guidance removes the requirement to categorize assets measured at fair value utilizing the net asset value per share (or equivalent) practical expedient within the fair value hierarchy. As of January 1, 2016, the Company adopted the updated accounting guidance retrospectively. The Company adjusted its previously reported financial information included herein to reflect the change in accounting guidance for assets measured using the net asset value. The impact of adopting the new accounting standard resulted in excluding overseas deposits of $31 million and $27 million and limited partnership investments held within the pension plan of $876 million and $935 million from the fair value level disclosures as of December 31, 2016 and December 31, 2015.

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Accounting Standards Pending Adoption

In May 2014, the FASB issued ASU No. 2014-09, Revenue Recognition (Topic 606): Revenue from Contracts with Customers. The standard excludes from its scope the accounting for insurance contracts, financial instruments, and certain other agreements that are governed under other GAAP guidance. The updated guidance requires an entity to recognize revenue as performance obligations are met, in an amount that reflects the consideration the entity is entitled to receive for the transfer of the promised goods or services. The standard is effective for interim and annual reporting periods beginning after December 15, 2017 and may be applied retrospectively or through a cumulative effect adjustment to retained earnings at the date of adoption. The Company has not made a decision on the method of adoption and is currently evaluating the effect the updated guidance will have on the Company’s financial statements.  While the Company anticipates some changes to revenue recognition for certain of our warranty products and services, we do not currently believe ASU 2014-09 will have a material effect on our Consolidated Financial Statements.

In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The updated accounting guidance requires changes to the reporting model for financial instruments. The guidance is effective for interim and annual periods beginning after December 15, 2017. The Company is currently evaluating the effect the guidance will have on the Company's financial statements, and expects the primary change for the Company to be the requirement for equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842): Accounting for Leases. The updated accounting guidance requires lessees to recognize on the balance sheet the assets and liabilities for the rights and obligations created by all leases, including those historically accounted for as operating leases. The guidance is effective for interim and annual periods beginning after December 15, 2018. The Company is currently evaluating the effect the updated guidance will have on the Company's financial statements. It is expected that assets and liabilities will increase based on the present value of remaining lease payments for leases in place at the adoption date; however, this is not expected to be material to the Company's results of operations or financial position.

In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvementsto Employee Share-Based Payment Accounting. The updated accounting guidance simplifies the accounting for share-based payment award transactions, including income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance is effective for annual and interim periods beginning after December 15, 2016. The Company is currently evaluating the effect the updated guidance will have on the Company’s financial statements, but anticipates the primary change to be the recognition of excess tax benefits or deficiencies on vesting or settlement of awards as an income tax benefit or expense within net income and the related cash flows classified within operating activities.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurementof Credit Losses on Financial Instruments. The updated accounting guidance requires changes to the recognition of credit losses on financial instruments not accounted for at fair value through net income. The guidance is effective for interim and annual periods beginning after December 15, 2019. The Company is currently evaluating the effect the guidance will have on the Company's financial statements, but expects the primary changes to be the use of the expected credit loss model for its mortgage loan portfolio and reinsurance receivables and the presentation of credit losses within the available-for-sale fixed maturities portfolio through an allowance method rather than as a direct write-down. The expected credit loss model will require a financial asset to be presented at the net amount expected to be collected. The allowance method for available-for-sale debt securities will allow the Company to record reversals of credit losses if the estimate of credit losses declines.

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Note B. Investments

The significant components of Net investment income are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Fixed maturity securities	$	1,819		$	1,751		$	1,803
Equity securities	10			12			12
Limited partnership investments	155			92			263
Mortgage loans	41			33			31
Short term investments	8			6			3
Trading portfolio	10			8			10
Other	4			1			3
Gross investment income	2,047			1,903			2,125
Investment expense	(59		)	(63		)	(58		)
Net investment income	$	1,988		$	1,840		$	2,067

As of December 31, 2016, the Company held no non-income producing fixed maturity securities. As of December 31, 2015, the Company held $54 million of non-income producing fixed maturity securities. As of December 31, 2016 and 2015, no investments in a single issuer exceeded 10% of stockholders' equity, other than investments in securities issued by the U.S. Treasury and obligations of government-sponsored enterprises.

Net realized investment gains (losses) are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Net realized investment gains (losses):
Fixed maturity securities:
Gross realized gains	$	204		$	131		$	170
Gross realized losses	(138		)	(197		)	(129		)
Net realized investment gains (losses) on fixed maturity securities	66			(66		)	41
Equity securities:
Gross realized gains	5			2			8
Gross realized losses	(10		)	(25		)	(7		)
Net realized investment gains (losses) on equity securities	(5		)	(23		)	1
Derivatives	(2		)	10			(1		)
Short term investments and other	(9		)	12			16
Net realized investment gains (losses)	$	50		$	(67	)	$	57

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Net change in unrealized gains on investments is presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Net change in unrealized gains on investments:
Fixed maturity securities	$	225		$	(1,114	)	$	1,511
Equity securities	(2		)	(6		)	6
Other	1			1			—
Total net change in unrealized gains on investments	$	224		$	(1,119	)	$	1,517

The components of OTTI losses recognized in earnings by asset type are presented in the following table.

Years ended December 31
(In millions)	2016		2015		2014
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	59	$	104	$	18
States, municipalities and political subdivisions	—		18		46
Asset-backed:
Residential mortgage-backed	10		8		5
Other asset-backed	3		1		1
Total asset-backed	13		9		6
Total fixed maturity securities available-for-sale	72		131		70
Equity securities available-for-sale -- Common stock	9		25		7
OTTI losses recognized in earnings	$	81	$	156	$	77

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The following tables present a summary of fixed maturity and equity securities.

December 31, 2016	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,711	$	1,323	$	76	$	18,958	$	(1	)
States, municipalities and political subdivisions	12,060		1,213		33		13,240		(16		)
Asset-backed:
Residential mortgage-backed	5,004		120		51		5,073		(28		)
Commercial mortgage-backed	2,016		48		24		2,040		—
Other asset-backed	1,022		8		5		1,025		—
Total asset-backed	8,042		176		80		8,138		(28		)
U.S. Treasury and obligations of government-sponsored enterprises	83		10		—		93		—
Foreign government	435		13		3		445		—
Redeemable preferred stock	18		1		—		19		—
Total fixed maturity securities available-for-sale	38,349		2,736		192		40,893		$	(45	)
Total fixed maturity securities trading	12						12
Equity securities available-for-sale:
Common stock	13		6		—		19
Preferred stock	93		2		4		91
Total equity securities available-for-sale	106		8		4		110
Total	$	38,467	$	2,744	$	196	$	41,015

December 31, 2015	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,080	$	1,019	$	342	$	17,757	$	—
States, municipalities and political subdivisions	11,729		1,453		8		13,174		(4		)
Asset-backed:
Residential mortgage-backed	4,935		154		17		5,072		(37		)
Commercial mortgage-backed	2,154		55		12		2,197		—
Other asset-backed	923		6		8		921		—
Total asset-backed	8,012		215		37		8,190		(37		)
U.S. Treasury and obligations of government-sponsored enterprises	62		5		—		67		—
Foreign government	334		13		1		346		—
Redeemable preferred stock	33		2		—		35		—
Total fixed maturity securities available-for-sale	37,250		2,707		388		39,569		$	(41	)
Total fixed maturity securities trading	3						3
Equity securities available-for-sale:
Common stock	46		3		1		48
Preferred stock	145		7		3		149
Total equity securities available-for-sale	191		10		4		197
Total	$	37,444	$	2,717	$	392	$	39,769

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The following tables present the estimated fair value and gross unrealized losses of fixed maturity and equity securities in a gross unrealized loss position by the length of time in which the securities have continuously been in that position.

	Less than 12 Months				12 Months or Longer				Total
December 31, 2016	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	2,615	$	61	$	254	$	15	$	2,869	$	76
States, municipalities and political subdivisions	959		32		23		1		982		33
Asset-backed:
Residential mortgage-backed	2,136		44		201		7		2,337		51
Commercial mortgage-backed	756		22		69		2		825		24
Other asset-backed	398		5		24		—		422		5
Total asset-backed	3,290		71		294		9		3,584		80
U.S. Treasury and obligations of government-sponsored enterprises	5		—		—		—		5		—
Foreign government	108		3		—		—		108		3
Redeemable preferred stock	—		—		—		—		—		—
Total fixed maturity securities available-for-sale	6,977		167		571		25		7,548		192
Equity securities available-for-sale -- Preferred stock	12		—		13		4		25		4
Total	$	6,989	$	167	$	584	$	29	$	7,573	$	196

	Less than 12 Months				12 Months or Longer				Total
December 31, 2015	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	4,882	$	302	$	162	$	40	$	5,044	$	342
States, municipalities and political subdivisions	338		8		75		—		413		8
Asset-backed:
Residential mortgage-backed	963		9		164		8		1,127		17
Commercial mortgage-backed	652		10		96		2		748		12
Other asset-backed	552		8		5		—		557		8
Total asset-backed	2,167		27		265		10		2,432		37
U.S. Treasury and obligations of government-sponsored enterprises	4		—		—		—		4		—
Foreign government	54		1		—		—		54		1
Redeemable preferred stock	3		—		—		—		3		—
Total fixed maturity securities available-for-sale	7,448		338		502		50		7,950		388
Equity securities available-for-sale:
Common Stock	3		1		—		—		3		1
Preferred stock	13		3		—		—		13		3
Total equity securities available-for-sale	16		4		—		—		16		4
Total	$	7,464	$	342	$	502	$	50	$	7,966	$	392

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Based on current facts and circumstances, the Company believes the unrealized losses presented in the December 31, 2016 securities in a gross unrealized loss position table above are not indicative of the ultimate collectibility of the current amortized cost of the securities, but rather are attributable to changes in interest rates, credit spreads and other factors. The Company has no current intent to sell securities with unrealized losses, nor is it more likely than not that it will be required to sell prior to recovery of amortized cost; accordingly, the Company has determined that there are no additional OTTI losses to be recorded as of December 31, 2016.

The following table presents the activity related to the pretax credit loss component reflected in Retained earnings on fixed maturity securities still held as of December 31, 2016, 2015 and 2014 for which a portion of an OTTI loss was recognized in Other comprehensive income (loss).

Years ended December 31
(In millions)	2016			2015			2014
Beginning balance of credit losses on fixed maturity securities	$	53		$	62		$	74
Reductions for securities sold during the period	(16		)	(9		)	(9		)
Reductions for securities the Company intends to sell or more likely than not will be required to sell	(1		)	—			(3		)
Ending balance of credit losses on fixed maturity securities	$	36		$	53		$	62

Contractual Maturity

The following table presents available-for-sale fixed maturity securities by contractual maturity.

December 31	2016				2015
(In millions)	Cost or Amortized Cost		Estimated Fair Value		Cost or Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,779	$	1,828	$	1,574	$	1,595
Due after one year through five years	7,566		7,955		7,721		8,070
Due after five years through ten years	15,892		16,332		14,652		14,915
Due after ten years	13,112		14,778		13,303		14,989
Total	$	38,349	$	40,893	$	37,250	$	39,569

Actual maturities may differ from contractual maturities because certain securities may be called or prepaid. Securities not due at a single date are allocated based on weighted average life.

Limited Partnerships

The carrying value of limited partnerships as of December 31, 2016 and 2015 was $2,371 million and $2,548 million, which includes undistributed earnings of $523 million and $687 million. Limited partnerships comprising 60% of the total carrying value are reported on a current basis through December 31, 2016 with no reporting lag, 18% are reported on a one month lag and the remainder are reported on more than a one month lag. The number of limited partnerships held and the strategies employed provide diversification to the limited partnership portfolio and the overall invested asset portfolio.

Limited partnerships comprising 68% and 70% of the carrying value as of December 31, 2016 and 2015 employ hedge fund strategies. Limited partnerships comprising 27% and 26% of the carrying value as of December 31, 2016 and 2015 were invested in private debt and equity and the remainder were primarily invested in real estate strategies. Hedge fund strategies include both long and short positions in fixed income, equity and derivative instruments. These hedge fund strategies may seek to generate gains from mispriced or undervalued securities, price differentials between securities, distressed investments, sector rotation or various arbitrage disciplines. Within hedge fund strategies, approximately 55% were equity related, 26% pursued a multi-strategy approach, 17% were focused on distressed investments and 2% were fixed income related as of December 31, 2016.

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The ten largest limited partnership positions held totaled $1,168 million and $1,221 million as of December 31, 2016 and 2015. Based on the most recent information available regarding the Company’s percentage ownership of the individual limited partnerships, the carrying value reflected on the Consolidated Balance Sheets represents approximately 4% and 3% of the aggregate partnership equity as of December 31, 2016 and 2015, and the related income reflected on the Consolidated Statements of Operations represents approximately 4%, 3% and 4% of the changes in aggregate partnership equity for the years ended December 31, 2016, 2015 and 2014.

While the Company generally does not invest in highly leveraged partnerships, there are risks inherent in limited partnership investments which may result in losses due to short-selling, derivatives or other speculative investment practices. The use of leverage increases volatility generated by the underlying investment strategies.

The Company’s limited partnership investments contain withdrawal provisions that generally limit liquidity for a period of thirty days up to one year and in some cases do not permit withdrawals until the termination of the partnership. Typically, withdrawals require advance written notice of up to 90 days.

Derivative Financial Instruments

The Company may use derivatives in the normal course of business, primarily in an attempt to reduce its exposure to market risk (principally interest rate risk, credit risk, equity price risk and foreign currency risk) stemming from various assets and liabilities. The Company's principal objective under such strategies is to achieve the desired reduction in economic risk, even if the position does not receive hedge accounting treatment.

The Company may enter into interest rate swaps, futures and forward commitments to purchase securities to manage interest rate risk. The Company may use foreign currency forward contracts to manage foreign currency risk.

Credit exposure associated with non-performance by the counterparties to derivative instruments is generally limited to the uncollateralized fair value of the asset related to the instruments recognized on the Consolidated Balance Sheets. The Company generally requires that all over-the-counter derivative contracts be governed by an International Swaps and Derivatives Association Master Agreement, and exchanges collateral under the terms of these agreements with its derivative investment counterparties depending on the amount of the exposure and the credit rating of the counterparty. Gross estimated fair values of derivative positions are presented in Other invested assets and Other liabilities on the Consolidated Balance Sheet. The Company does not offset derivative positions against the fair value of collateral provided or positions subject to netting arrangements. There would be no significant difference in the balance included in such accounts if the estimated fair values were presented net for the periods ended December 31, 2016 and 2015.

There was no cash collateral provided by the Company as of December 31, 2016 or 2015. There was no cash collateral received from counterparties held as of December 31, 2016 or 2015.

The Company holds an embedded derivative on funds withheld liability with a notional value of $174 million and $179 million as of December 31, 2016 and 2015 and a fair value of $3 million and $5 million as of December 31, 2016 and 2015. The embedded derivative on funds withheld liability is accounted for separately and reported with the funds withheld liability in Other liabilities on the Consolidated Balance Sheets.

Commercial Mortgage Loans

Risks related to the recoverability of loan balances include declines in the estimated cash flows from underlying property leases, fair value of collateral and creditworthiness of tenants of credit tenant loan properties, where lease payments directly service the loan. The Company evaluates loans for impairment on a specific loan basis and identifies loans for evaluation of impairment based on the collection experience of each loan and other credit quality indicators such as debt service coverage ratio and the creditworthiness of the borrower or tenants of credit tenant loan properties. As of December 31, 2016 and 2015, there were no loans past due or in non-accrual status, and no valuation allowance was recorded.

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Investment Commitments

As of December 31, 2016, the Company had committed approximately $380 million to future capital calls from various third-party limited partnership investments in exchange for an ownership interest in the related partnerships.

As of December 31, 2016, the Company had mortgage loan commitments of $20 million representing signed loan applications received and accepted.

The Company invests in various privately placed debt securities, including bank loans, as part of its overall investment strategy and has committed to additional future purchases, sales and funding. Purchases and sales of privately placed debt securities are recorded once funded. As of December 31, 2016, the Company had commitments to purchase or fund additional amounts of $130 million and sell $121 million under the terms of such securities.

Investments on Deposit

Securities with carrying values of approximately $2.3 billion and $2.8 billion were deposited by the Company’s insurance subsidiaries under requirements of regulatory authorities and others as of December 31, 2016 and 2015.

Cash and securities with carrying values of approximately $514 million and $364 million were deposited with financial institutions as collateral for letters of credit as of December 31, 2016 and 2015. In addition, cash and securities were deposited in trusts with financial institutions to secure reinsurance and other obligations with various third parties. The carrying values of these deposits were approximately $261 million and $263 million as of December 31, 2016 and 2015.

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Note C. Fair Value

Fair value is the price that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The following fair value hierarchy is used in selecting inputs, with the highest priority given to Level 1, as these are the most transparent or reliable.

Level 1 - Quoted prices for identical instruments in active markets.

Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets.

Level 3 - Valuations derived from valuation techniques in which one or more significant inputs are not observable.

Prices may fall within Level 1, 2 or 3 depending upon the methodology and inputs used to estimate fair value for each specific security. In general the Company seeks to price securities using third-party pricing services. Securities not priced by pricing services are submitted to independent brokers for valuation and, if those are not available, internally developed pricing models are used to value assets using a methodology and inputs the Company believes market participants would use to value the assets. Prices obtained from third-party pricing services or brokers are not adjusted by the Company.

The Company performs control procedures over information obtained from pricing services and brokers to ensure prices received represent a reasonable estimate of fair value and to confirm representations regarding whether inputs are observable or unobservable. Procedures may include i) the review of pricing service methodologies or broker pricing qualifications, ii) back-testing, where past fair value estimates are compared to actual transactions executed in the market on similar dates, iii) exception reporting, where period-over-period changes in price are reviewed and challenged with the pricing service or broker based on exception criteria, iv) deep dives, where the Company performs an independent analysis of the inputs and assumptions used to price individual securities and v) pricing validation, where prices received are compared to prices independently estimated by the Company.

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Assets and Liabilities Measured at Fair Value

Assets and liabilities measured at fair value on a recurring basis are presented in the following tables.

December 31, 2016								Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2			Level 3
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	18,840		$	130	$	18,970
States, municipalities and political subdivisions	—		13,239			1		13,240
Asset-backed:
Residential mortgage-backed	—		4,944			129		5,073
Commercial mortgage-backed	—		2,027			13		2,040
Other asset-backed	—		968			57		1,025
Total asset-backed	—		7,939			199		8,138
U.S. Treasury and obligations of government-sponsored enterprises	93		—			—		93
Foreign government	—		445			—		445
Redeemable preferred stock	19		—			—		19
Total fixed maturity securities	112		40,463			330		40,905
Equity securities	91		—			19		110
Other invested assets	—		5			—		5
Short term investments	475		853			—		1,328
Life settlement contracts, included in Other assets	—		—			58		58
Total assets	$	678	$	41,321		$	407	$	42,406
Liabilities
Other liabilities	$	—	$	(3	)	$	—	$	(3	)
Total liabilities	$	—	$	(3	)	$	—	$	(3	)

December 31, 2015								Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2			Level 3
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	17,592		$	168	$	17,760
States, municipalities and political subdivisions	—		13,172			2		13,174
Asset-backed:
Residential mortgage-backed	—		4,938			134		5,072
Commercial mortgage-backed	—		2,175			22		2,197
Other asset-backed	—		868			53		921
Total asset-backed	—		7,981			209		8,190
U.S. Treasury and obligations of government-sponsored enterprises	66		1			—		67
Foreign government	—		346			—		346
Redeemable preferred stock	35		—			—		35
Total fixed maturity securities	101		39,092			379		39,572
Equity securities	177		—			20		197
Other invested assets	—		17			—		17
Short term investments	448		1,134			—		1,582
Life settlement contracts, included in Other assets	—		—			74		74
Total assets	$	726	$	40,243		$	473	$	41,442
Liabilities
Other liabilities	$	—	$	(5	)	$	—	$	(5	)
Total liabilities	$	—	$	(5	)	$	—	$	(5	)

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The tables below present a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

Level 3 (In millions)	Balance as of January 1, 2016		Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)*			Net change in unrealized appreciation (depreciation) included in Other comprehensive income (loss)			Purchases		Sales			Settlements			Transfers into Level 3		Transfers out of Level 3			Balance as of December 31, 2016		Unrealized gains (losses) on Level 3 assets and liabilities held as of December 31, 2016 recognized in Net income (loss)*
Fixed maturity securities:
Corporate and other bonds	$	168	$	1		$	1		$	163	$	(36	)	$	(103	)	$	—	$	(64	)	$	130	$	—
States, municipalities and political subdivisions	2		—			—			—		—			(1		)	—		—			1		—
Asset-backed:
Residential mortgage-backed	134		3			(5		)	15		—			(14		)	56		(60		)	129		—
Commercial mortgage-backed	22		(1		)	(1		)	32		—			(17		)	3		(25		)	13		—
Other asset-backed	53		(2		)	1			86		(25		)	(1		)	2		(57		)	57		—
Total asset-backed	209		—			(5		)	133		(25		)	(32		)	61		(142		)	199		—
Total fixed maturity securities	379		1			(4		)	296		(61		)	(136		)	61		(206		)	330		—
Equity securities	20		(1		)	—			—		—			—			—		—			19		(2		)
Life settlement contracts	74		5			—			—		—			(21		)	—		—			58		(3		)
Total	$	473	$	5		$	(4	)	$	296	$	(61	)	$	(157	)	$	61	$	(206	)	$	407	$	(5	)

79

Level 3 (In millions)	Balance as of January 1, 2015		Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)*			Net change in unrealized appreciation (depreciation) included in Other comprehensive income (loss)			Purchases		Sales			Settlements			Transfers into Level 3		Transfers out of Level 3			Balance as of December 31, 2015		Unrealized gains (losses) on Level 3 assets and liabilities held as of December 31, 2015 recognized in Net income (loss)*
Fixed maturity securities:
Corporate and other bonds	$	162	$	(2	)	$	(3	)	$	65	$	(13	)	$	(35	)	$	40	$	(46	)	$	168	$	(2	)
States, municipalities and political subdivisions	94		1			—			—		—			(10		)	—		(83		)	2		—
Asset-backed:
Residential mortgage-backed	189		5			(3		)	81		—			(35		)	14		(117		)	134		—
Commercial mortgage-backed	83		7			(4		)	23		—			(17		)	17		(87		)	22		—
Other asset-backed	655		3			3			130		(263		)	(52		)	7		(430		)	53		—
Total asset-backed	927		15			(4		)	234		(263		)	(104		)	38		(634		)	209		—
Total fixed maturity securities	1,183		14			(7		)	299		(276		)	(149		)	78		(763		)	379		(2		)
Equity securities	16		—			(1		)	4		—			—			1		—			20		—
Life settlement contracts	82		25			—			—		—			(33		)	—		—			74		1
Total	$	1,281	$	39		$	(8	)	$	303	$	(276	)	$	(182	)	$	79	$	(763	)	$	473	$	(1	)

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*Net realized and unrealized gains and losses from Level 3 securities and derivatives are reported in Net income (loss) as follows:

Major Category of Assets and Liabilities	Consolidated Statements of Operations Line Items
Fixed maturity securities available-for-sale (1)	Net realized investment gains (losses)
Fixed maturity securities trading	Net investment income
Equity securities (1)	Net realized investment gains (losses)
Other invested assets - Derivative financial instruments held in a trading portfolio	Net investment income
Other invested assets - Derivative financial instruments not held in a trading portfolio	Net realized investment gains (losses)
Life settlement contracts	Other revenues
Other liabilities - Derivative financial instruments	Net realized investment gains (losses)

(1) Unrealized gains and losses are reported within AOCI.

Securities shown on the previous page may be transferred in or out of levels within the fair value hierarchy based on the availability of observable market information and quoted prices used to determine the fair value of the security. The availability of observable market information and quoted prices varies based on market conditions and trading volume. During the year ended December 31, 2016 there were no transfers between Level 1 and Level 2. There were $63 million of transfers from Level 2 to Level 1 and $52 million from Level 1 to Level 2 during the year ended December 31, 2015. The Company's policy is to recognize transfers between levels at the beginning of quarterly reporting periods.

Valuation Methodologies and Inputs

The following section describes the valuation methodologies and relevant inputs used to measure different financial instruments at fair value, including an indication of the level in the fair value hierarchy in which the instruments are generally classified.

Fixed Maturity Securities

Level 1 securities include highly liquid and exchange traded bonds and redeemable preferred stock, valued using quoted market prices. Level 2 securities include most other fixed maturity securities as the significant inputs are observable in the marketplace. All classes of Level 2 fixed maturity securities are valued using a methodology based on information generated by market transactions involving identical or comparable assets, a discounted cash flow methodology, or a combination of both when necessary. Common inputs for all classes of fixed maturity securities include prices from recently executed transactions of similar securities, marketplace quotes, benchmark yields, spreads off benchmark yields, interest rates and U.S. Treasury or swap curves. Specifically for asset-backed securities, key inputs include prepayment and default projections based on past performance of the underlying collateral and current market data. Fixed maturity securities are primarily assigned to Level 3 in cases where broker/dealer quotes are significant inputs to the valuation and there is a lack of transparency as to whether these quotes are based on information that is observable in the marketplace. Level 3 securities also include private placement debt securities whose fair value is determined using internal models with inputs that are not market observable.

Equity Securities

Level 1 equity securities include publicly traded securities valued using quoted market prices. Level 2 securities are primarily non-redeemable preferred stocks and common stocks valued using pricing for similar securities, recently executed transactions and other pricing models utilizing market observable inputs. Level 3 securities are primarily priced using broker/dealer quotes and internal models with inputs that are not market observable.

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Other Invested Assets

The fair value of Federal Home Loan Bank of Chicago (FHLBC) stock is equal to par because it can only be redeemed by the FHLBC at par or sold to another member of the FHLBC at par and is classified as Level 2.

As of December 31, 2016 and December 31, 2015, there were approximately $31 million and $27 million respectively of overseas deposits within other invested assets, which can be redeemed at net asset value in 90 days or less. Overseas deposits are excluded from the fair value hierarchy because their fair value is recorded using the net asset value per share (or equivalent) practical expedient.

Short Term Investments

Securities that are actively traded or have quoted prices are classified as Level 1. These securities include money market funds and treasury bills. Level 2 primarily includes commercial paper, for which all inputs are market observable. Fixed maturity securities purchased within one year of maturity are classified consistent with fixed maturity securities discussed above. Short term investments as presented in the tables above differ from the amounts presented on the Consolidated Balance Sheets because certain short term investments, such as time deposits, are not measured at fair value.

Life Settlement Contracts

Historically, the fair values of life settlement contracts were determined as the present value of the anticipated death benefits less anticipated premium payments based on contract terms that are distinct for each insured, as well as the Company's own assumptions for mortality, premium expense and the rate of return that a buyer would require on the contracts. As discussed in Note A, Summary of Significant Accounting Policies, because the Company has reached agreement on terms to sell the portfolio of life settlement contracts to a third party, the fair value was written down to reflect the value determined per the agreed terms of sale. Despite the pending sale, as there is not an active market for life settlement contracts, they have been classified as Level 3.

Derivative Financial Investments

Level 2 securities primarily include the embedded derivative on funds withheld liability. The embedded derivative on funds withheld liability is valued using the change in fair value of the assets supporting the funds withheld liability, which are fixed maturity securities valued with observable inputs.

Significant Unobservable Inputs

The following tables present quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurements of Level 3 assets. Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company. The valuation of life settlement contracts as of December 31, 2016 was based on the terms of the pending sale of the contracts to a third party, therefore the contracts are not included in the table below.

December 31, 2016	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	106	Discounted cash flow	Credit spread	2% - 40% (4%)

December 31, 2015	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	138	Discounted cash flow	Credit spread	3% - 184% (6%)
Life settlement contracts	74		Discounted cash flow	Discount rate risk premium	9%
				Mortality assumption	55% - 1676% (164%)

For fixed maturity securities, an increase to the credit spread assumptions would result in a lower fair value measurement. For life settlement contracts, an increase in the discount rate risk premium or decrease in the mortality assumption would result in a lower fair value measurement.

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Financial Assets and Liabilities Not Measured at Fair Value

The carrying amount and estimated fair value of the Company's financial assets and liabilities which are not measured at fair value on the Consolidated Balance Sheets are presented in the following tables.

December 31, 2016	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	591	$	—	$	—	$	594	$	594
Liabilities
Long term debt	$	2,710	$	—	$	2,952	$	—	$	2,952

December 31, 2015	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	678	$	—	$	—	$	688	$	688
Liabilities
Short term debt	$	350	$	—	$	360	$	—	$	360
Long term debt	2,210		—		2,433		—		2,433

The following methods and assumptions were used to estimate the fair value of these financial assets and liabilities.

The fair values of mortgage loans were based on the present value of the expected future cash flows discounted at the current interest rate for origination of similar quality loans, adjusted for specific loan risk.

The Company's senior notes and debentures were valued based on observable market prices. The fair value for other debt was estimated using discounted cash flows based on current incremental borrowing rates for similar borrowing arrangements.

The carrying amounts reported on the Consolidated Balance Sheets for Cash, Short term investments not carried at fair value, Accrued investment income and certain Other assets and Other liabilities approximate fair value due to the short term nature of these items. These assets and liabilities are not listed in the tables above.

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Note D. Income Taxes

The CNA Tax Group is included in the consolidated federal income tax return of Loews and its eligible subsidiaries. Loews and the Company have agreed that for each taxable year, the Company will 1) be paid by Loews the amount, if any, by which the Loews consolidated federal income tax liability is reduced by virtue of the inclusion of the CNA Tax Group in the Loews consolidated federal income tax return, or 2) pay to Loews an amount, if any, equal to the federal income tax that would have been payable by the CNA Tax Group filing a separate consolidated tax return. In the event that Loews should have a net operating loss in the future computed on the basis of filing a separate consolidated tax return without the CNA Tax Group, the Company may be required to repay tax recoveries previously received from Loews. This agreement may be canceled by either party upon 30 days written notice.

For the years ended December 31, 2016, 2015 and 2014, the Company paid $142 million, $256 million and $287 million to Loews related to federal income taxes.

For 2014 through 2016, the Internal Revenue Service (IRS) has accepted Loews and the Company into the Compliance Assurance Process (CAP), which is a voluntary program for large corporations. Under CAP, the IRS conducts a real-time audit and works contemporaneously with the Company to resolve any issues prior to the filing of the tax return. The Company believes that this approach should reduce tax-related uncertainties, if any.

As of December 31, 2016 and 2015, there were no unrecognized tax benefits.

The Company recognizes interest accrued related to: 1) unrecognized tax benefits in Interest expense and 2) tax refund claims in Other revenues on the Consolidated Statements of Operations. The Company recognizes penalties (if any) in Income tax (expense) benefit on the Consolidated Statements of Operations. During 2016, 2015 and 2014 the Company recognized no interest and no penalties. There were no amounts accrued for interest or penalties as of December 31, 2016 or 2015.

The following table presents a reconciliation between the Company's federal income tax expense at statutory rates and the recorded income tax expense, excluding discontinued operations.

Years ended December 31
(In millions)	2016			2015			2014
Income tax expense at statutory rates	$	(398	)	$	(192	)	$	(423	)
Tax benefit from tax exempt income	124			123			119
Foreign taxes and credits	3			9			(6		)
Other tax expense	(7		)	(10		)	(9		)
Income tax expense	$	(278	)	$	(70	)	$	(319	)

Provision has not been made for the Company's investment in certain subsidiaries for which the Company intends to invest the undistributed earnings indefinitely. As of December 31, 2016, the Company has not provided deferred taxes of $1 million on $3 million of undistributed earnings related to a foreign subsidiary.

The following table presents the current and deferred components of the Company's income tax expense, excluding discontinued operations.

Years ended December 31
(In millions)	2016			2015			2014
Current tax expense	$	(142	)	$	(220	)	$	(318	)
Deferred tax benefit (expense)	(136		)	150			(1		)
Total income tax expense	$	(278	)	$	(70	)	$	(319	)

Total income tax presented above includes foreign tax expense of approximately $9 million, $14 million and $24 million related to income from continuing foreign operations of approximately $51 million, $71 million and $66 million for the years ended December 31, 2016, 2015 and 2014.

84

The deferred tax effects of the significant components of the Company's deferred tax assets and liabilities are presented in the following table.

December 31
(In millions)	2016		2015
Deferred Tax Assets:
Insurance reserves:
Property and casualty claim and claim adjustment expense reserves	$	125	$	178
Unearned premium reserves	206		230
Receivables	27		29
Employee benefits	272		281
Life settlement contracts	56		48
Deferred retroactive reinsurance benefit	117		84
Investment valuation differences	—		29
Other assets	148		142
Gross deferred tax assets	951		1,021
Deferred Tax Liabilities:
Investment valuation differences	57		—
Deferred acquisition costs	120		117
Net unrealized gains	309		202
Other liabilities	86		64
Gross deferred tax liabilities	572		383
Net deferred tax asset	$	379	$	638

As of December 31, 2016, the CNA Tax Group had no loss carryforwards or tax credit carryforwards.

Although realization of deferred tax assets is not assured, management believes it is more likely than not that the recognized net deferred tax asset will be realized through recoupment of ordinary and capital taxes paid in prior carryback years and through future earnings, reversal of existing temporary differences and available tax planning strategies. As a result, no valuation allowance was recorded as of December 31, 2016 or 2015.

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Note E. Claim and Claim Adjustment Expense Reserves

The Company's property and casualty insurance claim and claim adjustment expense reserves represent the estimated amounts necessary to resolve all outstanding claims, including IBNR claims as of the reporting date. The Company's reserve projections are based primarily on detailed analysis of the facts in each case, the Company's experience with similar cases and various historical development patterns. Consideration is given to such historical patterns as claim reserving trends and settlement practices, loss payments, pending levels of unpaid claims and product mix, as well as court decisions, economic conditions, including inflation, and public attitudes. All of these factors can affect the estimation of claim and claim adjustment expense reserves.

Establishing claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves for catastrophic events that have occurred, is an estimation process. Many factors can ultimately affect the final settlement of a claim and, therefore, the necessary reserve. Changes in the law, results of litigation, medical costs, the cost of repair materials and labor rates can all affect ultimate claim costs. In addition, time can be a critical part of reserving determinations since the longer the span between the incidence of a loss and the payment or settlement of the claim, the more variable the ultimate settlement amount can be. Accordingly, short-tail claims, such as property damage claims, tend to be more reasonably estimable than long-tail claims, such as workers' compensation, general liability and professional liability claims. Adjustments to prior year reserve estimates, if necessary, are reflected in the results of operations in the period that the need for such adjustments is determined. There can be no assurance that the Company's ultimate cost for insurance losses will not exceed current estimates.

Catastrophes are an inherent risk of the property and casualty insurance business and have contributed to material period-to-period fluctuations in the Company's results of operations and/or equity. The Company reported catastrophe losses, net of reinsurance, of $165 million, $141 million and $156 million for the years ended December 31, 2016, 2015 and 2014. Catastrophe losses in 2016 related primarily to U.S. weather-related events and the Fort McMurray wildfires.

In developing claim and claim adjustment expense (“loss” or “losses”) reserve estimates, our actuaries perform detailed reserve analyses that are staggered throughout the year. Every reserve group is reviewed at least once during the year. The analyses generally review losses gross of ceded reinsurance and apply the ceded reinsurance terms to the gross estimates to establish estimates net of reinsurance. In addition to the detailed analyses, we review actual loss emergence for all products each quarter. In developing the loss reserve estimates for property and casualty contracts, we generally project ultimate losses using several common actuarial methods as listed below. We review the various indications from the various methods and apply judgment to select an actuarial point estimate. The indicated required reserve is the difference between the selected ultimate loss and the inception-to-date paid losses. The difference between the selected ultimate loss and the case incurred or reported loss is IBNR. IBNR includes a provision for development on known cases as well as a provision for late reported incurred claims. Further, the Company does not establish case reserves for allocated loss adjustment expenses (ALAE), therefore all ALAE reserves are included in our estimate of IBNR. The most frequently utilized methods to project ultimate losses include the following:

•paid development;

•incurred development;

•loss ratio;

•Bornhuetter-Ferguson using premiums and paid loss;

•Bornhuetter-Ferguson using premiums and incurred loss;

•frequency times severity; and

•stochastic modeling.

The paid development method estimates ultimate losses by reviewing paid loss patterns and applying them to accident years with further expected changes in paid loss. The incurred development method is similar to the paid development method, but it uses case incurred losses instead of paid losses. The loss ratio method multiplies premiums by an expected loss ratio to produce ultimate loss estimates for each accident year. The Bornhuetter-Ferguson using premiums and paid loss method is a combination of the paid development approach and the loss ratio approach. This method normally determines expected loss ratios similar to the approach used to estimate the expected loss ratio for the loss ratio method. The Bornhuetter-Ferguson using premiums and incurred loss method

86

is similar to the Bornhuetter-Ferguson using premiums and paid loss method except that it uses case incurred losses. The frequency times severity method multiplies a projected number of ultimate claims by an estimated ultimate average loss for each accident year to produce ultimate loss estimates. Stochastic modeling produces a range of possible outcomes based on varying assumptions related to the particular product being modeled.

For many exposures, especially those that can be considered long-tail, a particular accident or policy year may not have a sufficient volume of paid losses to produce a statistically reliable estimate of ultimate losses. In such a case, our actuaries typically assign more weight to the incurred development method than to the paid development method. As claims continue to settle and the volume of paid loss increases, the actuaries may assign additional weight to the paid development method. For most of our products, even the incurred losses for accident or policy years that are early in the claim settlement process will not be of sufficient volume to produce a reliable estimate of ultimate losses. In these cases, we may not assign any weight to the paid and incurred development methods. We will use the loss ratio, Bornhuetter-Ferguson and frequency times severity methods. For short-tail exposures, the paid and incurred development methods can often be relied on sooner, primarily because our history includes a sufficient number of years to cover the entire period over which paid and incurred losses are expected to change. However, we may also use the loss ratio, Bornhuetter-Ferguson and frequency times severity methods for short-tail exposures. For other more complex reserve groups where the above methods may not produce reliable indications, we use additional methods tailored to the characteristics of the specific situation.

Reserves for policyholder benefits for our Life & Group Non-Core segment, which primarily includes long term care, are based on actuarial assumptions which include estimates of morbidity, persistency, discount rates and expenses over the life of the contracts. Under GAAP, the best estimates of the actuarial assumptions at the date the contract was issued are locked-in throughout the life of the contract, unless a premium deficiency develops, which occurred in 2015. As a result, the Company updated the assumptions to represent management’s best estimates at the time of the premium deficiency and these revised assumptions are locked-in unless another premium deficiency is identified.

Certain claim liabilities are more difficult to estimate and have differing methodologies and considerations which are described below.

Our mass tort and A&EP reserving methodologies are similar as both are based on detailed account reviews of all large accounts with estimates based on ultimate payments considering the applicable law and coverage litigation. These reserves are subject to greater inherent variability than is typical of the remainder of the Company’s reserves due to, among other things, a general lack of sufficiently detailed data, expansion of the population being held responsible for these exposures and significant unresolved legal issues such as the existence of coverage and the definition of an occurrence.

Our actuarial reserve analyses result in point estimates. Each quarter, the results of detailed reserve reviews are summarized and discussed with our senior management to determine management's best estimate of reserves. Senior management considers many factors in making this decision. The factors include, but are not limited to, the historical pattern and volatility of the actuarial indications, the sensitivity of the actuarial indications to changes in paid and incurred loss patterns, the consistency of claims handling processes, the consistency of case reserving practices, changes in our pricing and underwriting, pricing and underwriting trends in the insurance market and legal, judicial, social and economic trends. Our recorded reserves reflect our best estimate as of a particular point in time based upon known facts, consideration of the factors cited above and our judgment. The carried reserve may differ from the actuarial point estimate as the result of our consideration of the factors noted above as well as the potential volatility of the projections associated with the specific product being analyzed and other factors affecting claims costs that may not be quantifiable through traditional actuarial analysis.

The loss reserve development tables presented herein illustrate the change over time of reserves established for claim and allocated claim adjustment expenses arising from short duration insurance contracts for certain lines of business within our property & casualty segments. Not all lines of business or segments are presented based on their context to the Company's overall loss reserves, calendar year reserve development, or calendar year net earned premiums. Insurance contracts are considered to be short duration contracts when the contracts are not expected to remain in force for an extended period of time. The Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses tables, reading across, show the cumulative net incurred claim and allocated claim adjustment expenses relating to each accident year at the end of the stated calendar year. Changes in the cumulative amount

87

across time are the result of the Company's expanded awareness of additional facts and circumstances that pertain to the unsettled claims. The Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses tables, reading across, show the cumulative amount paid for claims in each accident year as of the end of the stated calendar year. The Net Strengthening or (Releases) of Prior Accident Year Reserves tables, reading across, show the net increase or decrease in the cumulative net incurred accident year claim and allocated claim adjustment expenses during each stated calendar year and indicates whether the reserves for that accident year were strengthened or released.

The information in the tables is reported on a net basis after reinsurance and does not include unallocated claim and claim adjustment expenses or the effects of discounting. The information contained in the years preceding the current calendar year is unaudited. Information contained in the tables pertaining to our International segment has been presented at the year-end 2016 foreign currency exchange rates for all periods presented to remove the effects of foreign currency exchange rate changes between calendar years. The Company has presented development information for the Hardy business prospectively from the date of acquisition and is presented as a separate table within our International segment. To the extent the Company enters into a commutation, the transaction is reported on a prospective basis. To the extent that the Company enters into a disposition, the effects of the disposition are reported on a retrospective basis by removing the balances associated with the disposed of business.

The amounts reported for the cumulative number of reported claims include direct and assumed open and closed claims by accident year at the claimant level. The number excludes claim counts for claims within a policy deductible where the insured is responsible for payment of losses in the deductible layer. Claim count data for certain assumed reinsurance contracts is unavailable.

In the loss reserve development tables, IBNR includes reserves for incurred but not reported losses and expected development on case reserves. The Company does not case reserve ALAE, therefore all ALAE reserves are also included in the estimate of IBNR.

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Liability for Unpaid Claim and Claim Adjustment Expenses Rollforward

The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves of the Life & Group Non-Core segment.

As of or for the years ended December 31
(In millions)	2016			2015			2014
Reserves, beginning of year:
Gross	$	22,663		$	23,271		$	24,089
Ceded	4,087			4,344			4,972
Net reserves, beginning of year	18,576			18,927			19,117
Change in net reserves due to acquisition (disposition) of subsidiaries	—			—			(13		)
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year	5,025			4,934			5,043
Decrease in provision for insured events of prior years	(342		)	(255		)	(36		)
Amortization of discount	175			166			161
Total net incurred (1)	4,858			4,845			5,168
Net payments attributable to:
Current year events	(967		)	(856		)	(945		)
Prior year events	(4,167		)	(4,089		)	(4,355		)
Total net payments	(5,134		)	(4,945		)	(5,300		)
Foreign currency translation adjustment and other	(51		)	(251		)	(45		)
Net reserves, end of year	18,249			18,576			18,927
Ceded reserves, end of year	4,094			4,087			4,344
Gross reserves, end of year	$	22,343		$	22,663		$	23,271

(1) Total net incurred above does not agree to Insurance claims and policyholders' benefits as reflected on the Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance and loss deductible receivables, and benefit expenses related to future policy benefits, which are not reflected in the table above.

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The following tables present the gross and net carried reserves.

December 31, 2016	Specialty		Commercial		International		Life & Group Non-Core		Corporate & Other Non-Core		Total
(In millions)
Gross Case Reserves	$	1,871	$	4,661	$	632	$	3,172	$	1,524	$	11,860
Gross IBNR Reserves	4,278		4,233		696		186		1,090		10,483
Total Gross Carried Claim and Claim Adjustment Expense Reserves	$	6,149	$	8,894	$	1,328	$	3,358	$	2,614	$	22,343
Net Case Reserves	$	1,681	$	4,353	$	548	$	2,951	$	94	$	9,627
Net IBNR Reserves	3,723		3,952		653		158		136		8,622
Total Net Carried Claim and Claim Adjustment Expense Reserves	$	5,404	$	8,305	$	1,201	$	3,109	$	230	$	18,249

December 31, 2015	Specialty		Commercial		International		Life & Group Non-Core		Corporate & Other Non-Core		Total
(In millions)
Gross Case Reserves	$	2,011	$	4,975	$	622	$	2,973	$	1,521	$	12,102
Gross IBNR Reserves	4,258		4,208		725		247		1,123		10,561
Total Gross Carried Claim and Claim Adjustment Expense Reserves	$	6,269	$	9,183	$	1,347	$	3,220	$	2,644	$	22,663
Net Case Reserves	$	1,810	$	4,651	$	531	$	2,714	$	130	$	9,836
Net IBNR Reserves	3,758		3,925		688		216		153		8,740
Total Net Carried Claim and Claim Adjustment Expense Reserves	$	5,568	$	8,576	$	1,219	$	2,930	$	283	$	18,576

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Net Prior Year Development

Changes in estimates of claim and allocated claim adjustment expense reserves and premium accruals, net of reinsurance, for prior years are defined as net prior year development. These changes can be favorable or unfavorable. The following tables and discussion present the net prior year development recorded for Specialty, Commercial, International and Corporate & Other Non-Core segments.

Year ended December 31, 2016
(In millions)	Specialty			Commercial			International			Corporate & Other Non-Core		Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(287	)	$	55		$	(58	)	$	2	$	(288	)
Pretax (favorable) unfavorable premium development	(18		)	(2		)	(6		)	—		(26		)
Total pretax (favorable) unfavorable net prior year development	$	(305	)	$	53		$	(64	)	$	2	$	(314	)

Year ended December 31, 2015
(In millions)	Specialty			Commercial			International			Corporate & Other Non-Core		Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(141	)	$	(15	)	$	(54	)	$	—	$	(210	)
Pretax (favorable) unfavorable premium development	(11		)	(15		)	18			—		(8		)
Total pretax (favorable) unfavorable net prior year development	$	(152	)	$	(30	)	$	(36	)	$	—	$	(218	)

Year ended December 31, 2014
(In millions)	Specialty			Commercial			International			Corporate & Other Non-Core			Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(136	)	$	176		$	(59	)	$	(2	)	$	(21	)
Pretax (favorable) unfavorable premium development	(13		)	(20		)	2			(1		)	(32		)
Total pretax (favorable) unfavorable net prior year development	$	(149	)	$	156		$	(57	)	$	(3	)	$	(53	)

Favorable net prior year development of $45 million, $50 million and $14 million was recorded in the Life & Group Non-Core segment for the years ended December 31, 2016, 2015 and 2014. The favorable net prior year development for the year ended December 31, 2016 was driven by a reserve release resulting from the annual experience study of long term care claim reserves which indicated lower than expected claim severity.

Premium development can occur in the property and casualty business when there is a change in exposure on auditable policies or when premium accruals differ from processed premium.  Audits on policies usually occur in a period after the expiration date of the policy.

91

Specialty

The following table presents further detail of the net prior year claim and allocated claim adjustment expense reserve development (development) recorded for the Specialty segment.

Years ended December 31
(In millions)	2016			2015			2014
Pretax (favorable) unfavorable development:
Medical Professional Liability	$	(37	)	$	(43	)	$	39
Other Professional Liability and Management Liability	(130		)	—			(87		)
Surety	(63		)	(69		)	(82		)
Warranty	4			(2		)	(2		)
Other	(61		)	(27		)	(4		)
Total pretax (favorable) unfavorable development	$	(287	)	$	(141	)	$	(136	)

2016

Favorable development for medical professional liability was primarily due to lower than expected severities for individual healthcare professionals, allied facilities and hospitals in accident years 2011 and prior and better than expected severity in medical products liability in accident years 2010 through 2015. This was partially offset by unfavorable development in accident years 2012 and 2013 related to higher than expected large loss emergence in hospitals and higher than expected frequency and severity in accident years 2014 and 2015 in our aging services business.

Favorable development in other professional liability and management liability was primarily due to favorable settlements on closed claims and lower than expected frequency of claims in accident years 2010 through 2014 related to professional services and financial institutions. This was partially offset by unfavorable development related to a specific financial institutions claim in accident year 2014, higher management liability severities in accident year 2015, and deterioration on credit crises-related claims in accident year 2009.

Favorable development in surety coverages was primarily due to lower than expected frequency of large losses in accident years 2014 and prior.

Favorable development for other coverages provided to Specialty customers was due to better than expected claim frequency and claim severity in commercial lines coverages in accident years 2010 through 2015.

2015

Overall, favorable development for medical professional liability was related to lower than expected severity in accident years 2012 and prior. Unfavorable development was recorded related to increased claim frequency and severity in the aging services business in accident years 2013 and 2014.

Favorable development in other professional liability and management liability related to better than expected large loss emergence in financial institutions primarily in accident years 2011 through 2014. Additional favorable development related to lower than expected severity for professional services in accident years 2011 and prior. Unfavorable development was recorded related to increased frequency of large claims on public company management liability in accident years 2012 through 2014.

Favorable development for surety coverages was primarily due to lower than expected frequency of large losses in accident years 2013 and prior.

Favorable development for other coverages was due to better than expected claim frequency in property coverages provided to Specialty customers in accident year 2014.

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2014

Unfavorable development for medical professional liability was primarily related to increased frequency of large medical products liability class action lawsuits in accident years 2012 and prior and increased frequency of other large medical professional liability losses in accident years 2011 through 2013.

Overall, favorable development for other professional liability and management liability was related to better than expected severity in accident years 2008 through 2011, including favorable outcomes on individual large claims. Additional favorable development related to lower than expected frequency in accident years 2011 through 2013. Unfavorable development was recorded due to higher than expected severity in financial institution and professional service coverages in accident years 2009 through 2011.

Favorable development for surety coverages was primarily due to better than expected large loss emergence in accident years 2012 and prior.

Specialty - Line of Business Composition

The table below provides the line of business composition of the net liability for unpaid claim and claim adjustment expenses for the Specialty segment.

As of December 31
(In millions)	2016
Net liability for unpaid claim and claim adjustment expenses:
Medical Professional Liability	$	1,779
Other Professional Liability and Management Liability	3,063
Surety	394
Warranty	37
Other	131
Total net liability for unpaid claim and claim adjustment expenses	$	5,404

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Specialty - Medical Professional Liability

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	448	$	452	$	444	$	427	$	395	$	391	$	390	$	401	$	399	$	385	$	9	12,122
2008			426		451		496		480		468		468		467		455		442		9		14,094
2009					462		469		494		506		480		471		463		432		12		15,573
2010							483		478		478		486		470		446		403		16		15,206
2011									486		492		507		533		501		491		23		17,428
2012											526		529		575		567		559		47		18,375
2013													534		540		560		567		95		19,565
2014															511		548		585		165		19,286
2015																	480		539		278		16,798
2016																			469		400		11,600
																	Total		$	4,872	$	1,054

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	11	$	68	$	134	$	201	$	247	$	296	$	326	$	352	$	364	$	365
2008			9		90		207		282		332		377		395		409		428
2009					9		75		180		278		328		353		377		396
2010							11		93		186		273		338		361		371
2011									18		121		225		315		379		407
2012											15		121		236		359		428
2013													18		121		259		364
2014															25		149		274
2015																	22		105
2016																			18
																	Total		$	3,156
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	1,716
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			30
Liability for unallocated claim adjustment expenses for accident years presented																			33
Total net liability for unpaid claim and claim adjustment expenses																			$	1,779

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	4	$	(8	)	$	(17	)	$	(32	)	$	(4	)	$	(1	)	$	11		$	(2	)	$	(14	)	$	(63	)
2008			25			45			(16		)	(12		)	—			(1		)	(12		)	(13		)	16
2009						7			25			12			(26		)	(9		)	(8		)	(31		)	(30		)
2010									(5		)	—			8			(16		)	(24		)	(43		)	(80		)
2011												6			15			26			(32		)	(10		)	5
2012															3			46			(8		)	(8		)	33
2013																		6			20			7			33
2014																					37			37			74
2015																								59			59
Total net development for the accident years presented above																		$	63		$	(29	)	$	(16	)
Total net development for accident years prior to 2007																		(24		)	(14		)	(21		)
Total																		$	39		$	(43	)	$	(37	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

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Specialty - Other Professional Liability and Management Liability

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	804	$	817	$	806	$	754	$	734	$	724	$	704	$	681	$	662	$	662	$	13	16,011
2008			916		933		954		924		915		880		850		845		827		35		16,326
2009					829		873		903		898		891		900		895		903		50		17,263
2010							825		827		850		848		846		836		823		39		17,796
2011									876		904		933		948		944		910		107		18,620
2012											907		894		876		870		833		107		18,228
2013													844		841		879		840		137		17,324
2014															841		859		854		306		16,886
2015																	847		851		478		16,391
2016																			859		742		15,045
																	Total		$	8,362	$	2,014

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	32	$	162	$	307	$	397	$	472	$	524	$	564	$	585	$	593	$	614
2008			39		181		376		515		600		641		678		719		741
2009					37		195		358		550		638		719		769		798
2010							31		203		404		541		630		670		721
2011									71		313		502		604		682		726
2012											57		248		398		570		648
2013													51		240		426		583
2014															51		212		375
2015																	48		209
2016																			60
																	Total		$	5,475
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	2,887
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			104
Liability for unallocated claim adjustment expenses for accident years presented																			72
Total net liability for unpaid claim and claim adjustment expenses																			$	3,063

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	13	$	(11	)	$	(52	)	$	(20	)	$	(10	)	$	(20	)	$	(23	)	$	(19	)	$	—		$	(142	)
2008			17			21			(30		)	(9		)	(35		)	(30		)	(5		)	(18		)	(89		)
2009						44			30			(5		)	(7		)	9			(5		)	8			74
2010									2			23			(2		)	(2		)	(10		)	(13		)	(2		)
2011												28			29			15			(4		)	(34		)	34
2012															(13		)	(18		)	(6		)	(37		)	(74		)
2013																		(3		)	38			(39		)	(4		)
2014																					18			(5		)	13
2015																								4			4
Total net development for the accident years presented above																		$	(52	)	$	7		$	(134	)
Total net development for accident years prior to 2007																		(35		)	(7		)	4
Total																		$	(87	)	$	—		$	(130	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

95

Specialty - Surety

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	98	$	107	$	81	$	57	$	59	$	56	$	51	$	49	$	49	$	50	$	—	6,270
2008			114		114		73		68		61		52		48		45		44		—		7,153
2009					114		114		103		85		68		59		52		53		1		6,654
2010							112		112		111		84		76		66		63		8		5,943
2011									120		121		116		87		75		70		9		5,760
2012											120		122		98		70		52		16		5,473
2013													120		121		115		106		24		4,890
2014															123		124		94		51		4,737
2015																	131		131		100		4,279
2016																			124		110		2,902
																	Total		$	787	$	319

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	12	$	30	$	40	$	45	$	46	$	46	$	46	$	48	$	49	$	50
2008			9		27		35		39		42		43		43		43		43
2009					13		24		34		41		43		45		46		47
2010							13		34		50		55		57		58		55
2011									19		42		55		58		60		60
2012											5		32		34		35		35
2013													16		40		69		78
2014															7		30		38
2015																	7		26
2016																			5
																	Total		$	437
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	350
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			16
Liability for unallocated claim adjustment expenses for accident years presented																			28
Total net liability for unpaid claim and claim adjustment expenses																			$	394

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	9	$	(26	)	$	(24	)	$	2		$	(3	)	$	(5	)	$	(2	)	$	—		$	1		$	(48	)
2008			—			(41		)	(5		)	(7		)	(9		)	(4		)	(3		)	(1		)	(70		)
2009						—			(11		)	(18		)	(17		)	(9		)	(7		)	1			(61		)
2010									—			(1		)	(27		)	(8		)	(10		)	(3		)	(49		)
2011												1			(5		)	(29		)	(12		)	(5		)	(50		)
2012															2			(24		)	(28		)	(18		)	(68		)
2013																		1			(6		)	(9		)	(14		)
2014																					1			(30		)	(29		)
2015																								—			—
Total net development for the accident years presented above																		$	(75	)	$	(65	)	$	(64	)
Total net development for accident years prior to 2007																		(7		)	(4		)	1
Total																		$	(82	)	$	(69	)	$	(63	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

96

Commercial

The following table presents further detail of the development recorded for the Commercial segment.

Years ended December 31
(In millions)	2016			2015			2014
Pretax (favorable) unfavorable development:
Commercial Auto	$	(46	)	$	(22	)	$	31
General Liability	(28		)	(33		)	45
Workers' Compensation	150			80			139
Property and Other	(21		)	(40		)	(39		)
Total pretax (favorable) unfavorable development	$	55		$	(15	)	$	176

2016

Favorable development for commercial auto was primarily due to favorable settlements on claims in accident years 2010 through 2014 and lower than expected severities in accident years 2012 through 2015.

Favorable development for general liability was primarily due to better than expected claim settlements in accident years 2012 through 2014 and better than expected severity on umbrella claims in accident years 2010 through 2013. This was partially offset by unfavorable development related to an increase in reported claims prior to the closing of the three year window set forth by the Minnesota Child Victims Act in accident years 2006 and prior.

Unfavorable development for workers' compensation was primarily due to higher than expected severity for Defense Base Act contractors that largely resulted from a reduction of expected future recoveries from the US Department of Labor under the War Hazard Act. Further unfavorable development was due to the impact of recent Florida court rulings for accident years 2008 through 2015. These were partially offset by favorable development related to lower than expected frequencies related to our ongoing Middle Market and Small Business results for accident years 2009 through 2014.

Favorable development for property and other was primarily due to better than expected loss frequency in accident years 2013 through 2015. This was partially offset by unfavorable development related to higher than expected severity from a fourth quarter 2015 catastrophe event.

2015

Favorable development for commercial auto was primarily due to lower than expected severity in accident years 2009 through 2014.

Favorable development for general liability was primarily due to favorable settlements on claims in accident years 2010 through 2013.

Unfavorable development for workers’ compensation was primarily due to higher than expected severity related to Defense Base Act contractors in accident years 2008 through 2014.

Favorable development for property and other was primarily due to better than expected claim emergence from 2012 and 2014 catastrophe events and better than expected frequency of large claims in accident year 2014.

The year ended December 31, 2015 also included unfavorable loss development related to extra contractual obligation losses and losses associated with premium development.

97

2014

Unfavorable development for commercial auto was primarily related to higher than expected frequency in accident years 2012 and 2013 and higher than expected severity for liability coverages in accident years 2010 through 2013. Favorable development was recorded related to fewer large claims than expected in accident years 2008 and 2009.

Overall, unfavorable development for general liability was primarily related to higher than expected severity in accident years 2010 through 2013. Favorable development was recorded primarily related to lower than expected frequency of large losses in accident years 2005 through 2009.

Overall, unfavorable development for workers’ compensation was primarily due to increased medical severity in accident years 2010 and prior, higher than expected severity related to Defense Base Act contractors in accident years 2010 through 2013 and the recognition of losses related to favorable premium development in accident year 2013. Favorable development of $26 million was recorded in accident years 1996 and prior related to the commutation of a workers’ compensation reinsurance pool.

Favorable development for property and other first-party coverages was recorded in accident years 2013 and prior, primarily related to fewer claims than expected and favorable individual claim settlements.

Commercial - Line of Business Composition

The table below provides the line of business composition of the net liability for unpaid claim and claim adjustment expenses for the Commercial segment.

As of December 31
(In millions)	2016
Net Claim and claim adjustment expenses:
Commercial Auto	$	424
General Liability	3,248
Workers' Compensation	4,306
Property and Other	327
Total net liability for claim and claim adjustment expenses	$	8,305

98

Commercial - Commercial Auto

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	348	$	367	$	368	$	360	$	355	$	358	$	356	$	355	$	354	$	352	$	—	67,473
2008			322		323		316		306		309		305		298		298		296		—		56,407
2009					287		272		274		278		281		277		275		272		—		47,325
2010							262		274		279		283		291		286		281		1		46,324
2011									262		273		279		293		290		285		5		46,676
2012											270		282		292		296		300		11		45,279
2013													242		259		257		241		20		38,513
2014															231		221		210		40		32,958
2015																	199		197		65		29,714
2016																			196		105		25,196
																	Total		$	2,630	$	247

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	93	$	185	$	250	$	295	$	329	$	340	$	348	$	349	$	350	$	351
2008			83		158		210		244		274		289		291		292		293
2009					72		128		188		229		257		269		270		270
2010							72		137		197		240		265		274		279
2011									78		141		193		241		264		275
2012											77		157		214		253		276
2013													73		132		164		195
2014															63		100		135
2015																	52		95
2016																			51
																	Total		$	2,220
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	410
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			4
Liability for unallocated claim adjustment expenses for accident years presented																			10
Total net liability for unpaid claim and claim adjustment expenses																			$	424

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)		2010(1)			2011(1)			2012(1)		2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	19	$	1	$	(8	)	$	(5	)	$	3	$	(2	)	$	(1	)	$	(1	)	$	(2	)	$	4
2008			1		(7		)	(10		)	3		(4		)	(7		)	—			(2		)	(26		)
2009					(15		)	2			4		3			(4		)	(2		)	(3		)	(15		)
2010								12			5		4			8			(5		)	(5		)	19
2011											11		6			14			(3		)	(5		)	23
2012													12			10			4			4			30
2013																17			(2		)	(16		)	(1		)
2014																			(10		)	(11		)	(21		)
2015																						(2		)	(2		)
Total net development for the accident years presented above																$	37		$	(19	)	$	(42	)
Total net development for accident years prior to 2007																(6		)	(3		)	(4		)
Total																$	31		$	(22	)	$	(46	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

99

Commercial - General Liability

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	774	$	673	$	678	$	639	$	610	$	600	$	559	$	545	$	548	$	540	$	28	53,553
2008			611		604		630		647		633		632		613		600		591		18		44,586
2009					591		637		634		633		629		623		619		622		16		43,955
2010							566		597		599		649		695		675		659		25		43,378
2011									537		534		564		610		611		621		41		38,101
2012											539		563		579		570		558		63		34,037
2013													615		645		634		643		142		32,897
2014															627		634		635		224		26,744
2015																	573		574		330		21,687
2016																			622		495		16,720
																	Total		$	6,065	$	1,382

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	30	$	130	$	236	$	328	$	413	$	458	$	481	$	492	$	497	$	504
2008			31		129		261		390		473		528		550		560		567
2009					33		112		270		392		486		532		557		584
2010							27		139		267		414		530		577		608
2011									27		135		253		389		484		534
2012											27		127		233		340		417
2013													33		135		257		377
2014															29		115		245
2015																	31		132
2016																			34
																	Total		$	4,002
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	2,063
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			1,130
Liability for unallocated claim adjustment expenses for accident years presented																			55
Total net liability for unpaid claim and claim adjustment expenses																			$	3,248

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)			2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	(101	)	$	5		$	(39	)	$	(29	)	$	(10	)	$	(41	)	$	(14	)	$	3		$	(8	)	$	(234	)
2008				(7		)	26			17			(14		)	(1		)	(19		)	(13		)	(9		)	(20		)
2009							46			(3		)	(1		)	(4		)	(6		)	(4		)	3			31
2010										31			2			50			46			(20		)	(16		)	93
2011													(3		)	30			46			1			10			84
2012																24			16			(9		)	(12		)	19
2013																			30			(11		)	9			28
2014																						7			1			8
2015																									1			1
Total net development for the accident years presented above																			$	99		$	(46	)	$	(21	)
Total net development for accident years prior to 2007																			(54		)	13			(7		)
Total																			$	45		$	(33	)	$	(28	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

100

Commercial - Workers' Compensation

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	568	$	580	$	596	$	604	$	603	$	603	$	604	$	610	$	608	$	627	$	32	71,049
2008			558		575		593		606		608		612		622		630		638		36		59,883
2009					583		587		594		596		600		611		617		625		46		51,111
2010							576		619		641		663		683		697		717		45		48,056
2011									593		628		637		648		642		666		52		44,571
2012											589		616		648		661		671		86		41,683
2013													528		563		584		610		121		38,102
2014															459		474		474		157		32,996
2015																	416		426		206		31,296
2016																			421		287		27,042
																	Total		$	5,875	$	1,068

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	100	$	246	$	337	$	390	$	429	$	471	$	502	$	522	$	533	$	535
2008			92		233		323		381		425		461		489		505		520
2009					88		223		315		381		435		468		495		516
2010							94		245		352		433		500		531		565
2011									97		245		353		432		471		515
2012											86		229		338		411		465
2013													79		211		297		366
2014															60		157		213
2015																	50		130
2016																			52
																	Total		$	3,877
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	1,998
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			2,334
Other (2)																			(30		)
Liability for unallocated claim adjustment expenses for accident years presented																			4
Total net liability for unpaid claim and claim adjustment expenses																			$	4,306

(2) Other includes the effect of discounting lifetime claim reserves.

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)		2010(1)		2011(1)			2012(1)		2013(1)		2014(1)		2015(1)			2016		Total
Accident Year
2007	$	12	$	16	$	8	$	(1	)	$	—	$	1	$	6	$	(2	)	$	19	$	59
2008			17		18		13			2		4		10		8			8		80
2009					4		7			2		4		11		6			8		42
2010							43			22		22		20		14			20		141
2011										35		9		11		(6		)	24		73
2012												27		32		13			10		82
2013														35		21			26		82
2014																15			—		15
2015																			10		10
Total net development for the accident years presented above														$	125	$	69		$	125
Adjustment for development on a discounted basis														1		(4		)	1
Total net development for accident years prior to 2007														13		15			24
Total														$	139	$	80		$	150

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

101

International

The following table presents further detail of the development recorded for the International segment.

Years ended December 31
(In millions)	2016			2015			2014
Pretax (favorable) unfavorable development:
Medical Professional Liability	$	(5	)	$	(9	)	$	(7	)
Other Professional Liability	12			(16		)	(26		)
Liability	(30		)	(17		)	(13		)
Property & Marine	(34		)	(29		)	(4		)
Other	(1		)	17			(9		)
Total pretax (favorable) unfavorable development	$	(58	)	$	(54	)	$	(59	)

2016

Unfavorable development for other professional liability was primarily due to higher than expected large loss emergence in accident years 2011 through 2015 associated with our Commercial Institutions business, partially offset by favorable settlements on claims in accident years 2013 and prior.

Favorable development for liability was primarily due to favorable settlements on claims in accident years 2013 and prior related to our Canadian package business. Additional favorable development in accident years 2013 and 2015 was primarily due to lower than expected frequency of large losses related to our Europe business.

Favorable development for property and marine was due to better than expected severity on the December 2015 UK Floods and better than expected attritional losses and large loss experience on accident years 2013 through 2015 for Hardy business. Additional favorable development was due to a commutation of exposures in marine run-off classes on our Europe business.

2015

Favorable development in medical professional liability was due to better than expected frequency of losses in accident years 2011 to 2013.

Favorable development in other professional liability was due to better than expected large loss emergence in accident years 2011 and prior.

Favorable development in liability was due to better than expected large loss emergence in accident years 2012 and prior.

Favorable development in property and marine was due to better than expected individual large loss emergence and favorable settlements on large claims in accident years 2013 and 2014.

Unfavorable development in other is due to higher than expected large losses in financial institutions and political risk, primarily in accident year 2014.

102

2014

Overall, favorable development for other professional liability was primarily related to better than expected severity in accident years 2012 and prior. Unfavorable development was recorded in accident year 2008 due to financial crisis claims.

Favorable development for liability was primarily related to better than expected frequency and severity in accident years 2009 and subsequent.

Favorable development for property and marine coverages primarily related to better than expected frequency of large claims in accident years 2012 and prior. Reinsurance commutations in the first quarter of 2014 reduced ceded losses from prior years. Overall the commutations increased net operating income because of the release of the related allowance for uncollectible reinsurance.

Favorable development for other coverages was a result of better than expected frequency in Hardy, primarily in financial institution coverages.

International - Line of Business Composition

The table below provides the composition of the net liability for unpaid claim and claim adjustment expenses for the International segment.

As of December 31
(In millions)	2016
Net Claim and claim adjustment expenses:
International excluding Hardy	$	881
Hardy	320
Total net liability for claim and claim adjustment expenses	$	1,201

103

International - Excluding Hardy

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	204	$	219	$	213	$	194	$	181	$	172	$	164	$	162	$	160	$	159	$	4	27,149
2008			223		226		214		207		207		200		209		210		207		7		25,119
2009					249		245		247		247		234		231		222		213		13		21,362
2010							226		223		217		211		203		196		190		18		22,877
2011									259		260		253		233		223		216		14		25,361
2012											259		266		252		245		244		34		25,306
2013													281		282		275		256		56		23,999
2014															269		284		284		82		24,859
2015																	282		297		107		22,873
2016																			276		149		15,564
																	Total		$	2,342	$	484

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	31	$	99	$	112	$	124	$	133	$	140	$	144	$	148	$	150	$	152
2008			34		84		126		135		143		151		165		172		190
2009					38		90		119		134		149		159		170		181
2010							47		93		115		130		143		151		160
2011									44		111		133		146		159		171
2012											42		109		142		161		176
2013													49		109		135		152
2014															51		119		145
2015																	55		130
2016																			64
Total																			$	1,521
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	821
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			38
Liability for unallocated claim adjustment expenses for accident years presented																			22
Total net liability for unpaid claim and claim adjustment expenses																			$	881

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total (2)
Accident Year
2007	$	15	$	(6	)	$	(19	)	$	(13	)	$	(9	)	$	(8	)	$	(2	)	$	(2	)	$	(1	)	$	(45	)
2008			3			(12		)	(7		)	—			(7		)	9			1			(3		)	(16		)
2009						(4		)	2			—			(13		)	(3		)	(9		)	(9		)	(36		)
2010									(3		)	(6		)	(6		)	(8		)	(7		)	(6		)	(36		)
2011												1			(7		)	(20		)	(10		)	(7		)	(43		)
2012															7			(14		)	(7		)	(1		)	(15		)
2013																		1			(7		)	(19		)	(25		)
2014																					15			—			15
2015																								15			15

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

(2) The amounts included in the loss reserve development tables above are presented at the year-end 2016 foreign currency exchange rates for all periods presented to remove the effects of foreign currency exchange rate fluctuations between calendar years. The amounts included within the table on page 102 presenting the detail of the development recorded within the International segment include the impact of fluctuations in foreign currency exchange rates.

104

International - Hardy

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31								Calendar Year										As of December 31, 2016
(In millions, except reported claims data)	Net Claim and Allocated Claim Adjustment Expense Reserves at Acquisition		Net Incurred Claim and Allocated Claim Adjustment Expenses in 2012(1)(2)			Total Acquired Net Claim and Allocated Claim Adjustment Expense Reserves and 2012 Incurreds		2013(1)		2014(1)			2015(1)		2016			IBNR			Cumulative Number of Claims
Accident Year
2007	$	5	$	7		$	12	$	11	$	16		$	10	$	15		$	—		4,249
2008	18		(4		)	14		11		12			13		13			—			4,234
2009	11		1			12		6		(4		)	1		(2		)	—			3,840
2010	46		(10		)	36		46		50			44		50			—			4,495
2011	121		—			121		130		130			134		132			(2		)	6,193
2012	33		69			102		102		110			117		110			(1		)	6,758
2013								127		144			136		137			—			7,392
2014										182			180		174			7			7,656
2015													187		176			18			7,669
2016															225			101			5,274
													Total		$	1,030		$	123

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2012(1)(2)		2013(1)			2014(1)			2015(1)			2016
Accident Year
2007	$	3	$	14		$	14		$	14		$	14
2008	3		14			10			10			11
2009	1		(2		)	(4		)	(4		)	(4		)
2010	19		34			41			43			45
2011	29		80			119			123			127
2012	14		78			98			107			104
2013			37			100			119			125
2014						55			121			139
2015									29			97
2016												62
Total												$	720
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented												$	310
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007												3
Liability for unallocated claim adjustment expenses for accident years presented												7
Total net liability for unpaid claim and claim adjustment expenses												$	320

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2012(1)(2)			2013(1)			2014(1)			2015(1)			2016			Total (3)
Accident Year
2007	$	7		$	(1	)	$	5		$	(6	)	$	5		$	10
2008	(4		)	(3		)	1			1			—			(5		)
2009	1			(6		)	(10		)	5			(3		)	(13		)
2010	(10		)	10			4			(6		)	6			4
2011	—			9			—			4			(2		)	11
2012				—			8			7			(7		)	8
2013							17			(8		)	1			10
2014										(2		)	(6		)	(8		)
2015													(11		)	(11		)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

(2) Data presented for this calendar year is post-acquisition of Hardy.

(3) The amounts included in the loss reserve development tables above are presented at the year-end 2016 foreign currency exchange rates for all periods presented to remove the effects of foreign currency exchange rate fluctuations between calendar years. The amounts included within the table on page 102 presenting the detail of the development recorded within the International segment include the impact of fluctuations in foreign currency exchange rates.

105

The table below reconciles the net liability for unpaid claim and claim adjustment expenses for the property and casualty segments to the amount presented in the Consolidated Balance Sheets.

As of December 31
(In millions)	2016
Net liability for unpaid claim and claim adjustment expenses
Specialty	$	5,404
Commercial	8,305
International	1,201
Corporate & Other Non-Core	230
Life & Group Non-Core (1)	3,109
Total net claim and claim adjustment expenses	18,249
Reinsurance receivables (2)
Specialty	745
Commercial	589
International	127
Corporate & Other Non-Core	2,384
Life & Group Non-Core	249
Total reinsurance receivables	4,094
Total gross liability for unpaid claim and claim adjustment expenses	$	22,343

(1) The Life & Group Non-Core segment amount is primarily related to long term care claim reserves, but does include amounts related to unfunded structured settlements arising from short duration contracts. Long term care policies are long duration contracts.

(2) Reinsurance receivables presented do not include reinsurance receivables related to paid losses.

106

The table below presents information about average historical claims duration as of December 31, 2016 and is presented as required supplementary information, which is unaudited.

Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses in Year:
	1		2		3		4		5		6		7		8		9		10		Total
Specialty
Medical Professional Liability	3.1	%	18.2	%	22.3	%	19.6	%	12.7	%	8.0	%	5.0	%	4.8	%	3.7	%	0.3	%	97.7	%
Other Professional Liability and Management Liability	5.7	%	20.6	%	21.0	%	17.0	%	10.0	%	6.3	%	5.6	%	3.8	%	1.9	%	3.2	%	95.1	%
Surety(1)	23.4	%	32.8	%	20.2	%	8.9	%	3.7	%	1.5	%	(0.7	)%	2.0	%	1.0	%	2.0	%	94.8	%
Commercial
Commercial Auto	27.2	%	23.1	%	18.3	%	13.9	%	9.1	%	3.9	%	1.3	%	0.2	%	0.3	%	0.3	%	97.6	%
General Liability	5.0	%	16.3	%	20.5	%	20.1	%	15.3	%	8.0	%	4.2	%	2.7	%	1.1	%	1.3	%	94.5	%
Workers' Compensation	13.5	%	21.4	%	14.6	%	10.5	%	7.5	%	5.7	%	4.6	%	3.0	%	2.1	%	0.3	%	83.2	%
International
International - Excluding Hardy	19.5	%	27.4	%	12.1	%	6.8	%	5.9	%	4.5	%	4.8	%	3.7	%	5.0	%	1.3	%	91.0	%
International - Hardy (2)	25.7	%	40.9	%	12.1	%	4.4	%													83.1	%

(1) Due to the nature of the Surety business, average annual percentage payout of ultimate net incurred claim and allocated claim adjustment expenses has been calculated using only the payouts of mature accident years presented in the loss reserve development tables.

(2) Average historical claims duration for Hardy is presented prospectively beginning with the first full year subsequent to acquisition, 2013.

107

A&EP Reserves

In 2010, Continental Casualty Company (CCC) together with several of the Company’s insurance subsidiaries completed a transaction with National Indemnity Company (NICO), a subsidiary of Berkshire Hathaway Inc., under which substantially all of the Company’s legacy A&EP liabilities were ceded to NICO through a Loss Portfolio Transfer (LPT). At the effective date of the transaction, the Company ceded approximately $1.6 billion of net A&EP claim and allocated claim adjustment expense reserves to NICO under a retroactive reinsurance agreement with an aggregate limit of $4 billion. The $1.6 billion of claim and allocated claim adjustment expense reserves ceded to NICO was net of $1.2 billion of ceded claim and allocated claim adjustment expense reserves under existing third-party reinsurance contracts. The NICO LPT aggregate reinsurance limit also covers credit risk on the existing third-party reinsurance related to these liabilities. The Company paid NICO a reinsurance premium of $2 billion and transferred to NICO billed third-party reinsurance receivables related to A&EP claims with a net book value of $215 million, resulting in total consideration of $2.2 billion.

Subsequent to the effective date of the LPT, the Company recognized adverse prior year development on its A&EP reserves which resulted in additional amounts ceded under the LPT. As a result, the cumulative amounts ceded under the LPT exceeded the $2.2 billion consideration paid, resulting in the NICO LPT moving into a gain position, requiring retroactive reinsurance accounting. Under retroactive reinsurance accounting, this gain is deferred and only recognized in earnings in proportion to actual paid recoveries under the LPT. Over the life of the contract, there is no economic impact as long as any additional losses incurred are within the limit of the LPT. In a period in which the Company recognizes a change in the estimate of A&EP reserves that increases the amounts ceded under the LPT, the proportion of actual paid recoveries to total ceded losses is impacted and the change in the deferred gain is recognized in earnings as if the revised estimate of ceded losses was available at the effective date of the LPT. The effect of the deferred retroactive reinsurance benefit is recorded in Insurance claims and policyholders' benefits in the Consolidated Statement of Operations.

The following table presents the impact of the Loss Portfolio Transfer on the Consolidated Statements of Operations.

Years ended December 31
(In millions)	2016			2015			2014
Net A&EP adverse development before consideration of LPT	$	200		$	150		$	—
Retroactive reinsurance benefit recognized	(107		)	(85		)	(13		)
Pretax impact of A&EP reserve development and the LPT	$	93		$	65		$	(13	)

Based upon the Company's 2016 A&EP reserve review, net unfavorable prior year development of $200 million was recognized before consideration of cessions to the LPT. The unfavorable development was driven by an increase in anticipated future expenses associated with determination of coverage, higher anticipated payouts associated with a limited number of historical accounts having significant asbestos exposures and higher than expected severity on pollution claims. An A&EP reserve review was not completed in 2014 because additional information and analysis on inuring third-party reinsurance recoveries were needed to finalize the review. The review was finalized in the second quarter of 2015 and management has adopted the first quarter of the year as the timing for all future annual A&EP claims actuarial reviews, subject to the timing of the corresponding review performed by NICO. Unfavorable development of $150 million was recorded in 2015 to reflect a decrease in anticipated future reinsurance recoveries related to asbestos claims and higher than expected severity on pollution claims. While this unfavorable development was ceded to NICO in 2016 and 2015 under the LPT, the Company’s Net income in both periods was negatively affected due to the application of retroactive reinsurance accounting.

As of December 31, 2016 and 2015, the cumulative amounts ceded under the LPT were $2.8 billion and $2.6 billion. The unrecognized deferred retroactive reinsurance benefit was $334 million and $241 million as of December 31, 2016 and 2015.

NICO established a collateral trust account as security for its obligations to the Company. The fair value of the collateral trust account was $2.8 billion as of December 31, 2016 and 2015. In addition, Berkshire Hathaway Inc. guaranteed the payment obligations of NICO up to the aggregate reinsurance limit as well as certain of NICO’s performance obligations under the trust agreement. NICO is responsible for claims handling and billing and collection from third-party reinsurers related to the Company’s A&EP claims.

108

Note F. Legal Proceedings, Commitments and Contingencies, and Guarantees

CNA 401(k) Plus Plan Litigation

In September 2016, a class action lawsuit was filed against CCC, Continental Assurance Company (CAC), CNAF, the Investment Committee of the CNA 401(k) Plus Plan, The Northern Trust Company and John Does 1-10 (collectively Defendants) over the CNA 401(k) Plus Plan. The complaint alleges that defendants breached fiduciary duties to the CNA 401(k) Plus Plan and caused prohibited transactions in violation of the Employee Retirement Income Security Act of 1974 when the CNA 401(k) Plus Plan's Fixed Income Fund’s annuity contract with CAC was canceled. The plaintiff alleges he and a proposed class of the CNA 401(k) Plus Plan participants who had invested in the Fixed Income Fund suffered lower returns in their CNA 401(k) Plus Plan investments as a consequence of these alleged violations and seeks relief on behalf of the putative class. Management has only recently begun evaluating the lawsuit as this litigation is in its preliminary stages, and as of yet no class has been certified. CCC and the other defendants are contesting the case and management currently is unable to predict the final outcome or the impact on the Company’s financial condition, results of operations, or cash flows. As of December 31, 2016, the likelihood of loss is reasonably possible, but the amount of loss, if any, cannot be estimated at this stage of the litigation.

Small Business Premium Rate Adjustment Contingency

The Company recently identified rating errors related to its multi-peril package product within its Small Business unit.  The Company recorded a charge which reduced Earned premium by $16 million in anticipation of voluntarily issuing $30 million of premium refunds related to affected policies written from December 1, 2015 through December 31, 2016.  Earned premium in 2017 will be negatively impacted by the portion of the $30 million that has not yet been earned through December 31, 2016 and the expected refund amount will increase further because of premium written in 2017 prior to the Company’s actions to correct its rating process. The Company is currently in dialogue with state regulators and providing them with details regarding the anticipated premium refunds and other corrective actions.  The Company is reviewing other business lines to determine whether other similar issues exist. Fines or penalties related to the foregoing or further refunds which may be required are reasonably possible, but the amount of such losses, if any, cannot be estimated at this time.

Other Litigation

The Company is a party to other routine litigation incidental to its business, which, based on the facts and circumstances currently known, is not material to the Consolidated Financial Statements.

Commitments and Contingencies

The Company holds an investment in a real estate joint venture in which the Company, on a joint and several basis with the other unrelated shareholders, guaranteed to fund operating deficits of the joint venture and an operating lease for an office building entered into by the venture. The lease was terminated in March 2016. In the event that the other parties to the joint venture are unable to meet their commitments in funding this joint venture, the Company would be required to assume future obligations, primarily related to the wind-down of the lease and joint venture. The Company does not believe it is likely that it will be required to do so. However, as of December 31, 2016, the maximum potential loss that the Company could be required to pay under this guarantee, in excess of amounts already recorded, was approximately $11 million. If the Company were required to assume future obligations, the Company would have the right to pursue reimbursement from the other shareholders.

109

Guarantees

As of December 31, 2016 and December 31, 2015, the Company had recorded liabilities of approximately $5 million related to guarantee and indemnification agreements. Management believes that it is not likely that any future indemnity claims will be significantly greater than the amounts recorded.

In the course of selling business entities and assets to third parties, the Company agreed to guarantee the performance of certain obligations of a previously owned subsidiary and to indemnify purchasers for losses arising out of breaches of representation and warranties with respect to the business entities or assets sold, including, in certain cases, losses arising from undisclosed liabilities or certain named litigation. Such guarantee and indemnification agreements in effect for sales of business entities, assets and third-party loans may include provisions that survive indefinitely. As of December 31, 2016, the aggregate amount related to quantifiable guarantees was $375 million and the aggregate amount related to quantifiable indemnification agreements was $258 million. Should the Company be required to make payments under the guarantee, it would have the right to seek reimbursement in certain cases from an affiliate of a previously owned subsidiary.

In addition, the Company has agreed to provide indemnification to third-party purchasers for certain losses associated with sold business entities or assets that are not limited by a contractual monetary amount. As of December 31, 2016, the Company had outstanding unlimited indemnifications in connection with the sales of certain of its business entities or assets that included tax liabilities arising prior to a purchaser's ownership of an entity or asset, defects in title at the time of sale, employee claims arising prior to closing and in some cases losses arising from certain litigation and undisclosed liabilities. Certain provisions of the indemnification agreements survive indefinitely, while others survive until the applicable statutes of limitation expire, or until the agreed-upon contract terms expire.

The Company also provided guarantees, if the primary obligor fails to perform, to holders of structured settlement annuities provided by a previously owned subsidiary. As of December 31, 2016, the potential amount of future payments the Company could be required to pay under these guarantees was approximately $1.9 billion, which will be paid over the lifetime of the annuitants. The Company does not believe any payment is likely under these guarantees, as the Company is the beneficiary of a trust that must be maintained at a level that approximates the discounted reserves for these annuities.

110

Note G. Reinsurance

The Company cedes insurance to reinsurers to limit its maximum loss, provide greater diversification of risk, minimize exposures on larger risks and to exit certain lines of business. The ceding of insurance does not discharge the primary liability of the Company. A credit exposure exists with respect to reinsurance ceded to the extent that any reinsurer is unable to meet its obligations. A collectibility exposure also exists to the extent that the reinsurer disputes the liabilities assumed under reinsurance agreements. Property and casualty reinsurance coverages are tailored to the specific risk characteristics of each product line and the Company's retained amount varies by type of coverage. Reinsurance contracts are purchased to protect specific lines of business such as property and workers' compensation. Corporate catastrophe reinsurance is also purchased for property and workers' compensation exposure. Currently, most reinsurance contracts are purchased on an excess of loss basis. The Company also utilizes facultative reinsurance in certain lines. In addition, the Company assumes reinsurance, primarily through Hardy and as a member of various reinsurance pools and associations.

The following table presents the amounts receivable from reinsurers.

December 31
(In millions)	2016			2015
Reinsurance receivables related to insurance reserves:
Ceded claim and claim adjustment expenses	$	4,094		$	4,087
Ceded future policy benefits	212			207
Reinsurance receivables related to paid losses	147			197
Reinsurance receivables	4,453			4,491
Allowance for uncollectible reinsurance	(37		)	(38		)
Reinsurance receivables, net of allowance for uncollectible reinsurance	$	4,416		$	4,453

The Company has established an allowance for uncollectible reinsurance receivables related to credit risk. The Company reviews the allowance quarterly and adjusts the allowance as necessary to reflect changes in estimates of uncollectible balances. The allowance may also be reduced by write-offs of reinsurance receivable balances.

The Company attempts to mitigate its credit risk related to reinsurance by entering into reinsurance arrangements with reinsurers that have credit ratings above certain levels and by obtaining collateral. On a limited basis, the Company may enter into reinsurance agreements with reinsurers that are not rated, primarily captive reinsurers. The primary methods of obtaining collateral are through reinsurance trusts, letters of credit and funds withheld balances. Such collateral was approximately $3.0 billion and $3.2 billion as of December 31, 2016 and 2015.

The Company's largest recoverables from a single reinsurer including ceded unearned premium reserves, as of December 31, 2016, were approximately $2,353 million from a subsidiary of Berkshire Hathaway Group, $350 million from the Gateway Rivers Insurance Company and $212 million from subsidiaries of Wilton Re. These amounts are substantially collateralized. The recoverable from the Berkshire Hathaway Group includes amounts related to third-party reinsurance for which NICO has assumed the credit risk under the terms of the Loss Portfolio Transfer as discussed in Note E to the Consolidated Financial Statements.

111

The effects of reinsurance on earned premiums and written premiums are presented in the following tables.

(In millions)	Direct		Assumed		Ceded		Net		Assumed/ Net %
2016 Earned Premiums
Property and casualty	$	10,400	$	258	$	4,270	$	6,388	4.0	%
Long term care	486		50		—		536		9.3	%
Total earned premiums	$	10,886	$	308	$	4,270	$	6,924	4.4	%
2015 Earned Premiums
Property and casualty	$	9,853	$	274	$	3,754	$	6,373	4.3	%
Long term care	498		50		—		548		9.1	%
Total earned premiums	$	10,351	$	324	$	3,754	$	6,921	4.7	%
2014 Earned Premiums
Property and casualty	$	9,452	$	277	$	3,073	$	6,656	4.2	%
Long term care	508		48		—		556		8.6	%
Total earned premiums	$	9,960	$	325	$	3,073	$	7,212	4.5	%

(In millions)	Direct		Assumed		Ceded		Net		Assumed/ Net %
2016 Written Premiums
Property and casualty	$	10,451	$	245	$	4,255	$	6,441	3.8	%
Long term care	495		52		—		547		9.5	%
Total written premiums	$	10,946	$	297	$	4,255	$	6,988	4.3	%
2015 Written Premiums
Property and casualty	$	9,852	$	270	$	3,702	$	6,420	4.2	%
Long term care	493		49		—		542		9.0	%
Total written premiums	$	10,345	$	319	$	3,702	$	6,962	4.6	%
2014 Written Premiums
Property and casualty	$	9,283	$	276	$	3,024	$	6,535	4.2	%
Long term care	504		49		—		553		8.9	%
Total written premiums	$	9,787	$	325	$	3,024	$	7,088	4.6	%

Included in the direct and ceded earned premiums for the years ended December 31, 2016, 2015 and 2014 are $3,865 million, $3,344 million and $2,643 million related to property business that is 100% reinsured under a significant third-party captive program. The third-party captives that participate in this program are affiliated with the non-insurance company policyholders, therefore this program provides a means for the policyholders to self-insure this property risk. The Company receives and retains a ceding commission.

Long term care premiums are from long duration contracts; property and casualty premiums are from short duration contracts.

Insurance claims and policyholders' benefits reported on the Consolidated Statements of Operations are net of reinsurance recoveries of $3,016 million, $2,601 million and $1,379 million for the years ended December 31, 2016, 2015 and 2014, including $2,621 million, $2,282 million and $1,458 million, respectively, related to the significant third-party captive program discussed above. Reinsurance recoveries in 2014 were unfavorably affected by the commutation of a workers’ compensation reinsurance pool.

112

Note H. Debt

Debt is composed of the following obligations.

December 31
(In millions)	2016		2015
Short term debt:
Senior notes of CNAF, 6.500%, face amount of $350, due August 15, 2016	$	—	$	350
Long term debt:
Senior notes of CNAF:
6.950%, face amount of $150, due January 15, 2018	150		150
7.350%, face amount of $350, due November 15, 2019	349		349
5.875%, face amount of $500, due August 15, 2020	498		497
5.750%, face amount of $400, due August 15, 2021	398		397
3.950%, face amount of $550, due May 15, 2024	546		546
4.500%, face amount of $500, due March 1, 2026	498		—
Debenture of CNAF, 7.250%, face amount of $243, due November 15, 2023	241		241
Subordinated variable rate debt of Hardy, face amount of $30, due September 15, 2036	30		30
Total long term debt	2,710		2,210
Total debt	$	2,710	$	2,560

CCC is a member of the FHLBC. FHLBC membership provides participants with access to additional sources of liquidity through various programs and services. As a requirement of membership in the FHLBC, CCC held $5 million of FHLBC stock as of December 31, 2016 giving it access to approximately $111 million of additional liquidity. As of December 31, 2016 and 2015, CCC had no outstanding borrowings from the FHLBC.

During 2015, the Company entered into a five-year $250 million senior unsecured revolving credit facility with a syndicate of banks which may be used for general corporate purposes. At the Company's election, the commitments under the credit agreement may be increased from time to time up to an additional aggregate amount of $100 million and the credit agreement includes two optional one-year extensions prior to the first and second anniversary of the closing date, subject to applicable consents. Under the credit agreement, the Company is required to pay a facility fee which would adjust automatically in the event of a change in the Company's financial ratings. The credit agreement includes several covenants, including maintenance of a minimum consolidated net worth and a defined ratio of consolidated indebtedness to consolidated total capitalization. The minimum consolidated net worth, as defined as of December 31, 2016, was $8.7 billion. As of December 31, 2016 and 2015, the Company had no outstanding borrowings under the credit agreements.

The Company's debt obligations contain customary covenants for investment grade issuers. The Company was in compliance with all covenants as of and for the years ended December 31, 2016 and 2015.

The combined aggregate maturities for debt as of December 31, 2016 are presented in the following table.

(In millions)
2017	$	—
2018	150
2019	350
2020	500
2021	400
Thereafter	1,323
Less discount	(13		)
Total	$	2,710

113

Note I. Benefit Plans

Pension and Postretirement Health Care Benefit Plans

CNA sponsors noncontributory defined benefit pension plans, primarily through the CNA Retirement Plan, covering certain eligible employees. These plans were closed to new entrants. CNA's funding policy for defined benefit pension plans is to make contributions in accordance with applicable governmental regulatory requirements with consideration of the funded status of the plans.

Effective January 1, 2000, the CNA Retirement Plan was closed to new participants. Existing participants at that time were given a choice to either continue to accrue benefits under the CNA Retirement Plan or to cease accruals effective December 31, 1999. Employees who chose to continue to accrue benefits under the plan received benefits in accordance with plan provisions through June 30, 2015 as discussed further below. Employees who elected to cease accruals effective December 31, 1999 received the present value of their accrued benefit in an accrued pension account that is credited with interest based on the annual rate of interest on 30-year Treasury securities. These employees also receive certain enhanced employer contributions in the CNA 401(k) Plus Plan.

In 2016, the CNA Retirement Plan paid $88 million to settle its obligation to certain retirees through the purchase of a group annuity contract from a third party insurance company. This transaction reduced the plan’s projected benefit obligation by $86 million.

In the second quarter of 2015, the Company eliminated future benefit accruals associated with the CNA Retirement Plan effective June 30, 2015.  Employees who were continuing to accrue under the CNA Retirement Plan up until that date are entitled to an accrued benefit payable based on their eligible compensation and accrued service through June 30, 2015, in accordance with the terms of the CNA Retirement Plan. Starting with the first pay period after July 1, 2015, affected employees began receiving enhanced employer contributions in the CNA 401(k) Plus Plan similar to employees who elected to cease accruals effective December 31, 1999. Employees who elected to cease accruals effective December 31, 1999 are not affected by this curtailment. This curtailment resulted in a $55 million decrease in the CNA Retirement Plan benefit obligation liability and a reduction of the unrecognized actuarial losses included in AOCI. In connection with the curtailment, the Company remeasured the plan benefit obligation which resulted in an increase in the discount rate used to determine the benefit obligation from 3.85% to 4.00%.

During 2014, the CNA Retirement Plan offered a limited-time lump sum settlement payment opportunity to the majority of the terminated vested participants of the plan. The lump sum settlements reduced the Company’s risk and volatility related to funding the CNA Retirement Plan. The number of participants that elected to accept the lump sum opportunity was approximately 20% of the then total participants in the plan. Settlement payments of $253 million were made from CNA Retirement Plan assets. The $84 million settlement charge recorded by the Company in the fourth quarter of 2014 represents recognition of a portion of the unrecognized actuarial losses previously reflected in AOCI. This settlement charge is included in Other operating expenses within the Corporate & Other Non-Core segment.

CNA provides certain health care benefits to eligible retired employees, their covered dependents and their beneficiaries primarily through the CNA Health and Group Benefits Program. These postretirement benefits have largely been eliminated for active employees.

In the second quarter of 2014, the Company eliminated certain postretirement medical benefits associated with the CNA Health and Group Benefits Program. This change was a negative plan amendment which resulted in an $86 million curtailment gain reported in Other operating expenses within the Corporate & Other Non-Core segment. In connection with the plan amendment, the Company remeasured the plan benefit obligation which resulted in a decrease in the discount rate used to determine the benefit obligation from 3.60% to 3.10%.

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The following table presents a reconciliation of benefit obligations and plan assets.

	Pension Benefits						Postretirement Benefits
(In millions)	2016			2015			2016			2015
Benefit obligation as of January 1	$	2,821		$	3,019		$	23		$	29
Changes in benefit obligation:
Service cost	—			4			—			—
Interest cost	113			112			—			1
Participants' contributions	—			—			4			4
Plan amendments	—			(55		)	—			—
Actuarial (gain) loss	68			(79		)	(6		)	(3		)
Benefits paid	(173		)	(173		)	(7		)	(8		)
Foreign currency translation and other	(14		)	(7		)	1			—
Settlement through group annuity purchase	(86		)	—			—			—
Benefit obligation as of December 31	2,729			2,821			15			23
Fair value of plan assets as of January 1	2,267			2,456			—			—
Change in plan assets:
Actual return on plan assets	193			(18		)	—			—
Company contributions	9			10			3			4
Participants' contributions	—			—			4			4
Benefits paid	(173		)	(173		)	(7		)	(8		)
Foreign currency translation and other	(15		)	(8		)	—			—
Settlement through group annuity purchase	(88		)	—			—			—
Fair value of plan assets as of December 31	2,193			2,267			—			—
Funded status	$	(536	)	$	(554	)	$	(15	)	$	(23	)
Amounts recognized on the Consolidated Balance Sheets as of December 31:
Other assets	$	4		$	12		$	—		$	—
Other liabilities	(540		)	(566		)	(15		)	(23		)
Net amount recognized	$	(536	)	$	(554	)	$	(15	)	$	(23	)
Amounts recognized in Accumulated other comprehensive income, not yet recognized in net periodic cost (benefit):
Prior service credit	$	—		$	—		$	(4	)	$	(6	)
Net actuarial loss	999			999			(3		)	3
Net amount recognized	$	999		$	999		$	(7	)	$	(3	)

The accumulated benefit obligation for all defined benefit pension plans was $2,729 million and $2,821 million as of December 31, 2016 and 2015.

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The components of net periodic cost (benefit) are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Pension cost (benefit)
Service cost	$	—		$	4		$	9
Interest cost on projected benefit obligation	113			112			132
Expected return on plan assets	(160		)	(174		)	(191		)
Amortization of net actuarial loss	37			34			25
Settlement loss	—			—			84
Net periodic pension cost (benefit)	$	(10	)	$	(24	)	$	59
Postretirement cost (benefit)
Interest cost on projected benefit obligation	$	—		$	1		$	1
Amortization of prior service credit	(2		)	(3		)	(10		)
Amortization of net actuarial loss	—			1			1
Curtailment gain	—			—			(86		)
Net periodic postretirement cost (benefit)	$	(2	)	$	(1	)	$	(94	)

The amounts recognized in Other comprehensive income are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Pension and postretirement benefits
Amounts arising during the period	$	(29	)	$	(111	)	$	(337	)
Curtailment and other	—			56			(81		)
Settlement	—			—			84
Reclassification adjustment relating to prior service credit	(2		)	(3		)	(10		)
Reclassification adjustment relating to actuarial loss	37			35			26
Settlement through group annuity purchase	(2		)	—			—
Total increase (decrease) in Other comprehensive income	$	4		$	(23	)	$	(318	)

The table below presents the estimated amounts to be recognized from AOCI into net periodic cost (benefit) during 2017.

(In millions)	Pension Benefits		Postretirement Benefits
Amortization of prior service credit	$	—	$	(2	)
Amortization of net actuarial loss	36		—
Total estimated amounts to be recognized	$	36	$	(2	)

116

Actuarial assumptions used for the CNA Retirement Plan and CNA Health and Group Benefits Program to determine benefit obligations are presented in the following table.

December 31	2016		2015
Pension benefits
Discount rate	3.950	%	4.150	%
Expected long term rate of return	7.500		7.500
Postretirement benefits
Discount rate	2.750	%	2.750	%

Actuarial assumptions used for the CNA Retirement Plan and CNA Health and Group Benefits Program to determine net cost or benefit are presented in the following table.

Years ended December 31	2016		2015		2014
Pension benefits
Discount rate	4.150	%	3.850%/4.000%		4.650	%
Expected long term rate of return	7.500		7.500		7.500
Rate of compensation increases	N/A		3.920		3.990
Postretirement benefits
Discount rate	2.750	%	2.500	%	3.600%/3.100%

In determining the expected long term rate of return on plan assets assumption for the CNA Retirement Plan, CNA considered the historical performance of the benefit plan investment portfolio as well as long term market return expectations based on the investment mix of the portfolio and the expected investment horizon.

The CNA Health and Group Benefits Program has limited its share of the health care trend rate to a cost-of-living adjustment of 4% per year. For all participants, the employer subsidy on health care costs will not increase by more than 4% per year. As a result, the assumed health care cost trend rate used in measuring the accumulated postretirement benefit obligation for the CNA Health and Group Benefits Program was 4% per year in 2016, 2015 and 2014.

CNA employs a total return approach whereby a mix of equity, limited partnerships and fixed maturity securities are used to maximize the long term return of retirement plan assets for a prudent level of risk and to manage cash flows according to plan requirements. The target allocation of plan assets is 40% to 60% invested in equity securities and limited partnerships, with the remainder primarily invested in fixed maturity securities. Alternative investments, including limited partnerships, are used to enhance risk adjusted long term returns while improving portfolio diversification. The intent of this strategy is to minimize the Company's expense related to funding the plan by generating investment returns that exceed the growth of the plan liabilities over the long run. Risk tolerance is established after careful consideration of the plan liabilities, plan funded status and corporate financial conditions.

As of December 31, 2016, the plan had committed approximately $113 million to future capital calls from various third-party limited partnership investments in exchange for an ownership interest in the related partnerships. Derivatives may be used to gain market exposure in an efficient and timely manner. Investment risk is measured and monitored on an ongoing basis through annual liability measurements, periodic asset/liability studies and quarterly investment portfolio reviews.

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Pension plan assets measured at fair value on a recurring basis as well as cash are presented in the following tables.

December 31, 2016
(In millions)	Level 1		Level 2		Level 3		Total
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	500	$	10	$	510
States, municipalities and political subdivisions	—		63		—		63
Asset-backed:
Residential mortgage-backed	—		109		—		109
Commercial mortgage-backed	—		66		—		66
Other asset-backed	—		4		—		4
Total asset-backed	—		179		—		179
Total fixed maturity securities	—		742		10		752
Equity securities	363		105		—		468
Derivative financial instruments	—		—		—		—
Short term investments	11		35		—		46
Other assets	—		37		—		37
Cash	14		—		—		14
Total assets measured at fair value	$	388	$	919	$	10	1,317
Total limited partnerships measured at net asset value (1)							876
Total plan assets							$	2,193

December 31, 2015
(In millions)	Level 1		Level 2		Level 3		Total Assets
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	455	$	10	$	465
States, municipalities and political subdivisions	—		106		—		106
Asset-backed:
Residential mortgage-backed	—		133		—		133
Commercial mortgage-backed	—		69		—		69
Other asset-backed	—		11		—		11
Total asset-backed	—		213		—		213
Total fixed maturity securities	—		774		10		784
Equity securities	336		107		—		443
Derivative financial instruments	1		—		—		1
Short term investments	24		28		—		52
Other assets	—		52		—		52
Total assets measured at fair value	$	361	$	961	$	10	1,332
Total limited partnerships measured at net asset value (1)							935
Total plan assets							$	2,267

(1) In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.

118

The limited partnership investments held within the plan are recorded at fair value, which represents the plan's share of net asset value of each partnership, as determined by the general partner. Limited partnerships comprising 86% and 87% of the carrying value as of December 31, 2016 and 2015 employ hedge fund strategies that generate returns through investing in marketable securities in the public fixed income and equity markets and the remainder were primarily invested in private debt and equity. Within hedge fund strategies, approximately 57% were equity related, 38% pursued a multi-strategy approach and 5% were focused on distressed investments as of December 31, 2016.

For a discussion of the fair value levels and the valuation methodologies used to measure fixed maturity securities, equities, derivatives and short term investments, see Note C to the Consolidated Financial Statements.

119

The tables below present a reconciliation for all pension plan assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

Level 3 (In millions)	Balance as of January 1, 2016		Actual return on assets still held as of December 31, 2016		Actual return on assets sold during the year ended December 31, 2016		Purchases, sales and settlements		Net transfers into (out of) Level 3		Balance as of December 31, 2016
Fixed maturity securities:
Corporate and other bonds	$	10	$	—	$	—	$	—	$	—	$	10
Total	$	10	$	—	$	—	$	—	$	—	$	10

Level 3 (In millions)	Balance as of January 1, 2015		Actual return on assets still held as of December 31, 2015		Actual return on assets sold during the year ended December 31, 2015		Purchases, sales and settlements		Net transfers into (out of) Level 3			Balance as of December 31, 2015
Fixed maturity securities:
Corporate and other bonds	$	15	$	—	$	—	$	—	$	(5	)	$	10
Total	$	15	$	—	$	—	$	—	$	(5	)	$	10

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The table below presents the estimated future minimum benefit payments to participants as of December 31, 2016.

(In millions)	Pension Benefits		Postretirement Benefits
2017	$	178	$	3
2018	178		2
2019	177		2
2020	178		2
2021	178		2
2022-2026	883		3

In 2017, CNA expects to contribute $12 million to its pension plans and $3 million to its postretirement health care benefit plans.

Savings Plans

CNA sponsors savings plans, which are generally contributory plans that allow most employees to contribute a maximum of 50% of their eligible compensation, subject to certain limitations prescribed by the IRS. The Company contributes matching amounts to participants, amounting to 70% of the first 6% (35% of the first 6% in the first year of employment) of eligible compensation contributed by the employee. Matching contributions vest ratably over participants first five years of service.

Eligible employees also receive a Company contribution of 3% or 5% of their eligible compensation, depending on their age. In addition, these employees are eligible to receive additional discretionary contributions of up to 2% of eligible compensation and an additional Company match of up to 80% of the first 6% of eligible compensation contributed by the employee. These additional contributions are made at the discretion of management and are contributed to participant accounts in the first quarter of the year following management's determination of the discretionary amounts. Matching contributions vest ratably over participants first five years of service.

Benefit expense for the Company's savings plans was $75 million, $71 million and $69 million for the years ended December 31, 2016, 2015 and 2014.

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Note J. Stock-Based Compensation

The CNAF Incentive Compensation Plan (the Plan), as amended and restated on January 1, 2010, as amended, authorizes the grant of stock-based compensation to certain management personnel for up to 11 million shares of CNAF's common stock. The Plan currently provides for awards of stock options, stock appreciation rights (SARs), restricted shares, restricted stock units (RSUs), performance-based RSUs and performance share units. The number of shares available for the granting of stock-based compensation under the Plan as of December 31, 2016 was approximately 3.7 million.

The Company recorded stock-based compensation expense related to the Plan of $36 million, $14 million and $11 million for the years ended December 31, 2016, 2015 and 2014. The related income tax benefit recognized was $12 million, $5 million and $4 million for the years ended December 31, 2016, 2015, and 2014. The compensation cost related to non-vested awards not yet recognized was $32 million, and the weighted average period over which it is expected to be recognized is 1.9 years as of December 31, 2016.

Equity based compensation that is not fully vested prior to termination is generally forfeited upon termination, except in cases of retirement, death or disability, and as otherwise provided by contractual obligations.

Share Awards

The fair value of share awards is based on the market value of the Company's common stock as of the date of grant. Share awards currently granted under the Plan include RSUs, performance-based RSUs and performance share units. Generally, RSU's vest over a two or three year service period following the date of grant. Performance-based RSUs generally become payable within a range of 0% to 100% of the number of shares initially granted based upon the attainment of specific annual performance goals and vest ratably over a four-year service period following the date of grant.

In 2016, CNA adopted the Annual Performance Share Plan (PSP). The PSP provides officers with an opportunity to earn an award based upon attainment of specific performance goals achieved over a one-year performance period. Awards are granted at the beginning of each performance year and are subject to a two-year cliff vesting period after the Company’s annual performance has been determined. Prior to the PSP, CNA issued performance share units under the Long Term Incentive Plan (LTI). The LTI Plan has a three year performance period and will continue to have outstanding awards through 2017. In both plans, the performance share units become payable within a range of 0% to 200% of the number of performance share units initially granted.

In 2016, CNA granted Special Supplemental Equity Awards (SSE). The awards consist of restricted stock units subject to both Company performance in 2016 and service-based vesting up to two years. Payments made under the PSP and SSE are made entirely in shares of common stock, except for awards made to non-U.S. participants, which are paid in cash.

The following table presents activity for non-vested RSUs, performance-based RSUs and performance share units under the Plan in 2016.

	Number of Awards		Weighted-Average Grant Date Fair Value
Balance as of January 1, 2016	735,263		$	36.53
Awards granted	2,545,624		32.27
Awards vested	(371,443	)	33.33
Awards forfeited, canceled or expired	(186,932	)	32.80
Performance-based adjustment	(590,730	)	33.10
Balance as of December 31, 2016	2,131,782		$	33.28

SARs

The exercise price of all SARs granted is based on the market value of the Company's common stock as of the date of grant. SARs generally vest ratably over a four-year service period following date of grant and have a maximum term of ten years.

122

The fair value of granted SARs was estimated at the grant date using the Black-Scholes option-pricing model. The Black-Scholes model incorporates a risk free rate of return and various assumptions regarding the underlying common stock and the expected life of the securities granted. Different interest rates and assumptions were used for each grant, as appropriate based on date of grant.

There were no SARs granted for the years ended December 31, 2016 and 2015. As of December 31, 2016, there were approximately 1 million awards outstanding, fully vested or expected to vest and be exercisable. The grant date fair value of SARs vested was $1 million for the year ended December 31, 2014.

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Note K. Other Intangible Assets

Other intangible assets are presented in the following table.

December 31		2016				2015
(In millions)	Economic Useful Life	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Value of business acquired	1 - 4 years	$	48	$	48	$	57	$	57
Trade name	8 years	6		3		7		3
Distribution channel	15 years	10		3		12		3
Total finite-lived intangible assets		64		54		76		63
Indefinite-lived intangible assets:
Syndicate capacity		43				52
Agency force		16				16
Total indefinite-lived intangible assets		59				68
Total other intangible assets		$	123	$	54	$	144	$	63

The Company's other intangible assets primarily relate to the purchase of Hardy, and the amortization of these intangible assets is included in the Statement of Operations for the International segment. For the year ended December 31, 2014 amortization expense of $2 million was included in Amortization of deferred acquisition costs. For the years ended December 31, 2016, 2015 and 2014 amortization expense of $1 million was included in Other operating expenses. The gross carrying amounts and accumulated amortization in the table above may change from period to period as a result of foreign currency translation. Estimated future amortization expense for other intangible assets is $1 million annually in 2017 through 2021.

Note L. Operating Leases

The Company occupies office facilities under lease agreements that expire at various dates. In addition, data processing, office and transportation equipment is leased under agreements that expire at various dates. Most leases contain renewal options that provide for rent increases based on prevailing market conditions. Lease expenses for the years ended December 31, 2016, 2015 and 2014 were $60 million, $46 million and $55 million. Sublease revenue for the year ended December 31, 2014 was $1 million.

The table below presents the expected future minimum lease payments to be made under non-cancelable operating leases as of December 31, 2016.

(In millions)	Future Minimum Lease Payments
2017	$	48
2018	37
2019	30
2020	33
2021	34
Thereafter	244
Total	$	426

In connection with the planned relocation of the Company's global headquarters, on March 24, 2016, the Company sold the building in which it maintains the current principal executive offices of CNAF. Concurrently, the Company agreed to lease back the current office space until the relocation of the global headquarters under a separate lease agreement, which is expected to occur in 2018. The sale-leaseback agreement includes expected future minimum lease payments of $10 million in 2017 and $4 million in 2018.

124

Note M. Stockholders’ Equity and Statutory Accounting Practices

Common Stock Dividends

There are no restrictions on the retained earnings or net income of CNAF with regard to payment of dividends to its stockholders. However, given the holding company nature of CNAF, its ability to pay a dividend is significantly dependent on the receipt of dividends from its subsidiaries, particularly CCC, which directly or indirectly owns all significant subsidiaries. See the Statutory Accounting Practices section below for a discussion of the regulatory restrictions on CCC's availability to pay dividends.

CNAF's ability to pay dividends is indirectly limited by the minimum consolidated net worth covenant in the Company's line of credit agreement. See Note H to the Consolidated Financial Statements for further discussion of the Company's debt obligations.

Statutory Accounting Practices

CNAF’s insurance subsidiaries are domiciled in various jurisdictions. These subsidiaries prepare statutory financial statements in accordance with accounting practices prescribed or permitted by the respective jurisdictions’ insurance regulators. Domestic prescribed statutory accounting practices are set forth in a variety of publications of the National Association of Insurance Commissioners (NAIC) as well as state laws, regulations and general administrative rules. These statutory accounting principles vary in certain respects from GAAP. In converting from statutory accounting principles to GAAP, the more significant adjustments include deferral of policy acquisition costs and the inclusion of net unrealized holding gains or losses in stockholders’ equity relating to certain fixed maturity securities.

The Company has a prescribed practice as it relates to the accounting under Statement of Statutory Accounting Principles No. 62R (SSAP No. 62R), Property and Casualty Reinsurance, paragraphs 67 and 68 in conjunction with the 2010 Loss Portfolio Transfer with NICO which is further discussed in Note E.  The prescribed practice allows the Company to aggregate all third party AE&P reinsurance balances administered by NICO in Schedule F and to utilize the Loss Portfolio Transfer as collateral for the underlying third party reinsurance balances for purposes of calculating the statutory reinsurance penalty. This prescribed practice increased statutory capital and surplus by $67 million and $90 million at December 31, 2016 and 2015.

The 2015 long term care premium deficiency discussed in Note A was recorded on a GAAP basis. There was no premium deficiency for statutory accounting purposes. Statutory accounting principles requires the use of prescribed discount rates in calculating the reserves for long term care future policy benefits which are lower than the discount rates used on a GAAP basis and results in higher carried reserves relative to GAAP reserves.

The payment of dividends by CNAF's insurance subsidiaries without prior approval of the insurance department of each subsidiary’s domiciliary jurisdiction is generally limited by formula. Dividends in excess of these amounts are subject to prior approval by the respective insurance regulator.

Dividends from CCC are subject to the insurance holding company laws of the State of Illinois, the domiciliary state of CCC. Under these laws, ordinary dividends, or dividends that do not require prior approval by the Illinois Department of Insurance (the Department), are determined based on the greater of the prior year's statutory net income or 10% of statutory surplus as of the end of the prior year, as well as timing and amount of dividends paid in the preceding twelve months. Additionally, ordinary dividends may only be paid from earned surplus, which is calculated by removing unrealized gains from unassigned surplus. As of December 31, 2016, CCC is in a positive earned surplus position. The maximum allowable dividend CCC could pay during 2017 that would not be subject to the Department’s prior approval is $1,075 million, less dividends paid during the preceding twelve months measured at that point in time. CCC paid dividends of $765 million in 2016. The actual level of dividends paid in any year is determined after an assessment of available dividend capacity, holding company liquidity and cash needs as well as the impact the dividends will have on the statutory surplus of the applicable insurance company.

125

Combined statutory capital and surplus and statutory net income (loss), determined in accordance with accounting practices prescribed or permitted by insurance and/or other regulatory authorities for the Combined Continental Casualty Companies, are presented in the table below.

	Statutory Capital and Surplus				Statutory Net Income (Loss)
	December 31				Years ended December 31
(In millions)	2016 (1)		2015		2016 (1)		2015		2014
Combined Continental Casualty Companies	$	10,748	$	10,723	$	1,033	$	1,148	$	914

(1) Information derived from the statutory-basis financial statements to be filed with insurance regulators.

CNAF’s domestic insurance subsidiaries are subject to risk-based capital (RBC) requirements. RBC is a method developed by the NAIC to determine the minimum amount of statutory capital appropriate for an insurance company to support its overall business operations in consideration of its size and risk profile. The formula for determining the amount of RBC specifies various factors, weighted based on the perceived degree of risk, which are applied to certain financial balances and financial activity. The adequacy of a company's actual capital is evaluated by a comparison to the RBC results, as determined by the formula. Companies below minimum RBC requirements are classified within certain levels, each of which requires specified corrective action.

The statutory capital and surplus presented above for CCC was approximately 270% and 266% of company action level RBC as of December 31, 2016 and 2015. Company action level RBC is the level of RBC which triggers a heightened level of regulatory supervision. The statutory capital and surplus of the Company's foreign insurance subsidiaries, which is not significant to the overall statutory capital and surplus, also met or exceeded their respective regulatory and other capital requirements.

126

Note N. Accumulated Other Comprehensive Income (Loss) by Component

The table below displays the changes in Accumulated other comprehensive income (loss) by component.

(In millions)	Net unrealized gains (losses) on investments with OTTI losses		Net unrealized gains (losses) on other investments		Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of December 31, 2015	$	27	$	390	$	(648	)	$	(84	)	$	(315	)
Other comprehensive income (loss) before reclassifications	9		290		(22		)	(114		)	163
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $(3), $(16), $12, $- and $(7)	6		38		(23		)	—			21
Other comprehensive income (loss) net of tax (expense) benefit of $(1), $(117), $(3), $- and $(121)	3		252		1			(114		)	142
Balance as of December 31, 2016	$	30	$	642	$	(647	)	$	(198	)	$	(173	)

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments			Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of December 31, 2014	$	36		$	942		$	(633	)	$	55		$	400
Other comprehensive income (loss) before reclassifications	(23		)	(595		)	(36		)	(139		)	(793		)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $8, $30, $11, $- and $49	(14		)	(43		)	(21		)	—			(78		)
Other comprehensive income (loss) net of tax (expense) benefit of $5, $282, $8, $- and $295	(9		)	(552		)	(15		)	(139		)	(715		)
Balance as of December 31, 2015	$	27		$	390		$	(648	)	$	(84	)	$	(315	)

Amounts reclassified from Accumulated other comprehensive income (loss) shown above are reported in Net income (loss) as follows:

Component of AOCI	Consolidated Statements of Operations Line Item Affected by Reclassifications
Net unrealized gains (losses) on investments with OTTI losses	Net realized investment gains (losses)
Net unrealized gains (losses) on other investments	Net realized investment gains (losses)
Pension and postretirement benefits	Other operating expenses

127

Note O. Business Segments

The Company's core property and casualty commercial insurance operations are managed and reported in three business segments: Specialty, Commercial and International. Specialty provides a broad array of professional, financial and specialty property and casualty products and services through a network of independent agents, brokers and managing general underwriters. Commercial includes property and casualty coverages sold to small businesses and middle market entities and organizations primarily through an independent agency distribution system. Commercial also includes commercial insurance and risk management products sold to large corporations primarily through insurance brokers. International provides management and professional liability coverages as well as a broad range of other property and casualty insurance products and services abroad through a network of brokers, independent agencies and managing general underwriters, as well as the Lloyd’s of London marketplace.

The Company's non-core operations are managed and reported in two segments: Life & Group Non-Core and Corporate & Other Non-Core. Life & Group Non-Core primarily includes the results of our individual and group long term care businesses that are in run-off. Corporate & Other Non-Core primarily includes certain corporate expenses, including interest on corporate debt, and the results of certain property and casualty business in run-off, including CNA Re and A&EP.

The accounting policies of the segments are the same as those described in Note A to the Consolidated Financial Statements. The Company manages most of its assets on a legal entity basis, while segment operations are generally conducted across legal entities. As such, only Insurance and Reinsurance receivables, Insurance reserves, Deferred acquisition costs and Goodwill are readily identifiable for all individual segments. Distinct investment portfolios are not maintained for every individual segment; accordingly, allocation of assets to each segment is not performed. Therefore, a significant portion of Net investment income and Realized investment gains or losses are allocated primarily based on each segment's net carried insurance reserves, as adjusted. All significant intersegment income and expense has been eliminated. Income taxes have been allocated on the basis of the taxable income of the segments.

Approximately 7.9%, 8.0% and 8.8% of the Company's direct written premiums were derived from outside the United States for the years ended December 31, 2016, 2015 and 2014.

In the following tables, certain financial measures are presented to provide information used by management to monitor the Company's operating performance. Management utilizes these financial measures to monitor the Company's insurance operations and investment portfolio. Net operating income (loss), which is derived from certain income statement amounts, is used by management to monitor performance of the Company's insurance operations. The Company's investment portfolio is monitored by management through analysis of various factors including unrealized gains and losses on securities, portfolio duration and exposure to market and credit risk. Based on such analyses, the Company may recognize an OTTI loss on an investment security in accordance with its policy, or sell a security, which may produce realized gains and losses.

Net operating income (loss) is calculated by excluding from net income (loss) the after-tax effects of i) net realized investment gains (losses) ii) income or loss from discontinued operations and iii) any cumulative effects of changes in accounting guidance. The calculation of net operating income excludes net realized investment gains (losses) because net realized investment gains (losses) are largely discretionary, except for some losses related to OTTI, and are generally driven by economic factors that are not necessarily consistent with key drivers of underwriting performance, and are therefore not considered an indication of trends in insurance operations.

128

The Company's results of continuing operations and selected balance sheet items by segment are presented in the following tables.

Year ended December 31, 2016	Specialty			Commercial			International			Life & Group Non-Core			Corporate & Other Non-Core
(In millions)																Eliminations			Total
Net written premiums	$	2,780		$	2,841		$	821		$	547		$	—		$	(1	)	$	6,988
Operating revenues
Net earned premiums	$	2,779		$	2,804		$	806		$	536		$	—		$	(1	)	$	6,924
Net investment income	516			638			51			767			16			—			1,988
Other revenues	362			32			—			(2		)	12			—			404
Total operating revenues	3,657			3,474			857			1,301			28			(1		)	9,316
Claims, Benefits and Expenses
Net incurred claims and benefits	1,467			1,927			492			1,286			98			—			5,270
Policyholders’ dividends	4			9			—			—			—			—			13
Amortization of deferred acquisition costs	591			470			174			—			—			—			1,235
Other insurance related expenses	301			560			133			132			(3		)	(1		)	1,122
Other expenses	312			36			24			8			209			—			589
Total claims, benefits and expenses	2,675			3,002			823			1,426			304			(1		)	8,229
Operating income (loss) before income tax	982			472			34			(125		)	(276		)	—			1,087
Income tax (expense) benefit on operating income (loss)	(332		)	(161		)	(13		)	145			98			—			(263		)
Net operating income (loss)	650			311			21			20			(178		)	—			824
Net realized investment gains (losses)	5			4			18			25			(2		)	—			50
Income tax (expense) benefit on net realized investment gains (losses)	(2		)	(2		)	(3		)	(9		)	1			—			(15		)
Net realized investment gains (losses), after tax	3			2			15			16			(1		)	—			35
Net income (loss) from continuing operations	$	653		$	313		$	36		$	36		$	(179	)	$	—		$	859

December 31, 2016
(In millions)
Reinsurance receivables	$	760	$	621	$	131	$	462	$	2,479	$	—	$	4,453
Insurance receivables	982		1,021		233		17		2		—		2,255
Deferred acquisition costs	310		214		76		—		—		—		600
Goodwill	117		—		28		—		—		—		145
Insurance reserves
Claim and claim adjustment expenses	6,149		8,894		1,328		3,358		2,614		—		22,343
Unearned premiums	1,911		1,323		396		132		—		—		3,762
Future policy benefits	—		—		—		10,326		—		—		10,326

129

Year ended December 31, 2015	Specialty			Commercial			International			Life & Group Non-Core			Corporate & Other Non-Core
(In millions)																Eliminations			Total
Net written premiums	$	2,781		$	2,818		$	822		$	542		$	1		$	(2	)	$	6,962
Operating revenues
Net earned premiums	$	2,782		$	2,788		$	804		$	548		$	1		$	(2	)	$	6,921
Net investment income	474			593			52			704			17			—			1,840
Other revenues	356			37			(1		)	7			11			(3		)	407
Total operating revenues	3,612			3,418			855			1,259			29			(5		)	9,168
Claims, Benefits and Expenses
Net incurred claims and benefits	1,597			1,814			479			1,421			61			—			5,372
Policyholders’ dividends	4			8			—			—			—			—			12
Amortization of deferred acquisition costs	589			469			168			314			—			—			1,540
Other insurance related expenses	278			538			138			142			(1		)	(2		)	1,093
Other expenses	301			28			12			11			186			(3		)	535
Total claims, benefits and expenses	2,769			2,857			797			1,888			246			(5		)	8,552
Operating income (loss) before income tax	843			561			58			(629		)	(217		)	—			616
Income tax (expense) benefit on operating income (loss)	(283		)	(192		)	(21		)	315			80			—			(101		)
Net operating income (loss)	560			369			37			(314		)	(137		)	—			515
Net realized investment gains (losses)	(33		)	(47		)	1			(1		)	13			—			(67		)
Income tax (expense) benefit on net realized investment gains (losses)	11			16			—			9			(5		)	—			31
Net realized investment gains (losses), after tax	(22		)	(31		)	1			8			8			—			(36		)
Net income (loss) from continuing operations	$	538		$	338		$	38		$	(306	)	$	(129	)	$	—		$	479

December 31, 2015
(In millions)
Reinsurance receivables	$	724	$	639	$	144	$	497	$	2,487	$	—	$	4,491
Insurance receivables	890		993		233		11		2		—		2,129
Deferred acquisition costs	307		213		78		—		—		—		598
Goodwill	117		—		33		—		—		—		150
Insurance reserves
Claim and claim adjustment expenses	6,269		9,183		1,347		3,220		2,644		—		22,663
Unearned premiums	1,839		1,297		415		120		—		—		3,671
Future policy benefits	—		—		—		10,152		—		—		10,152

130

Year ended December 31, 2014	Specialty			Commercial						Life & Group Non-Core			Corporate & Other Non-Core
(In millions)							International									Eliminations			Total
Net written premiums	$	2,839		$	2,817		$	880		$	553		$	1		$	(2	)	$	7,088
Operating revenues
Net earned premiums	$	2,838		$	2,906		$	913		$	556		$	1		$	(2	)	$	7,212
Net investment income	560			723			61			700			23			—			2,067
Other revenues	295			38			—			16			12			(5		)	356
Total operating revenues	3,693			3,667			974			1,272			36			(7		)	9,635
Claims, Benefits and Expenses
Net incurred claims and benefits	1,627			2,187			488			1,304			(29		)	—			5,577
Policyholders’ dividends	6			8			—			—			—			—			14
Amortization of deferred acquisition costs	592			493			204			28			—			—			1,317
Other insurance related expenses	262			487			151			130			1			(2		)	1,029
Other expenses	254			31			28			30			210			(5		)	548
Total claims, benefits and expenses	2,741			3,206			871			1,492			182			(7		)	8,485
Operating income (loss) before income tax	952			461			103			(220		)	(146		)	—			1,150
Income tax (expense) benefit on operating income (loss)	(318		)	(154		)	(34		)	151			54			—			(301		)
Net operating income (loss)	634			307			69			(69		)	(92		)	—			849
Net realized investment gains (losses)	15			16			(1		)	7			20			—			57
Income tax (expense) benefit on net realized investment gains (losses)	(5		)	(6		)	1			—			(8		)	—			(18		)
Net realized investment gains (losses), after tax	10			10			—			7			12			—			39
Net income (loss) from continuing operations	$	644		$	317		$	69		$	(62	)	$	(80	)	$	—		$	888

131

The following table presents revenue by line of business for each reportable segment. Revenues are comprised of operating revenues and net realized investment gains and losses.

Years ended December 31
(In millions)	2016			2015			2014
Specialty
Management & Professional Liability	$	2,620		$	2,617		$	2,818
Surety	532			502			509
Warranty & Alternative Risks	510			460			381
Specialty revenues	3,662			3,579			3,708
Commercial
Middle Market	1,769			1,623			1,631
Small Business	583			616			709
Other Commercial Insurance	1,126			1,132			1,343
Commercial revenues	3,478			3,371			3,683
International
Canada	203			214			273
CNA Europe	319			309			335
Hardy	353			333			365
International revenues	875			856			973
Life & Group Non-Core revenues	1,326			1,258			1,279
Corporate & Other Non-Core revenues	26			42			56
Eliminations	(1		)	(5		)	(7		)
Total revenues	$	9,366		$	9,101		$	9,692

132

Note P. Discontinued Operations

The results of discontinued operations reflected in the Consolidated Statements of Operations were as follows:

Year ended December 31
(In millions)	2014
Revenues
Net earned premiums	$	—
Net investment income	94
Net realized investment gains	3
Other revenues	—
Total revenues	97
Claims, Benefits and Expenses
Insurance claims and policyholders' benefits	75
Other operating expenses	2
Total claims, benefits and expenses	77
Income before income tax	20
Income tax expense	(6		)
Income from operations of discontinued operations, net of income tax	14
Loss on sale, net of income tax benefit of $40	(211		)
Loss from discontinued operations	$	(197	)

The disposal group included $3,550 million of assets and $3,297 million of liabilities as of August 1, 2014.

Note Q. Quarterly Financial Data (Unaudited)

The following tables present unaudited quarterly financial data.

2016
(In millions, except per share data)	First		Second		Third		Fourth		Full Year
Revenues	$	2,195	$	2,348	$	2,433	$	2,390	$	9,366
Net income (loss) (1)	$	66	$	209	$	343	$	241	$	859
Basic earnings (loss) per share	$	0.25	$	0.77	$	1.27	$	0.89	$	3.18
Diluted earnings (loss) per share	$	0.24	$	0.77	$	1.26	$	0.89	$	3.17

2015
(In millions, except per share data)	First		Second		Third		Fourth			Full Year
Revenues	$	2,352	$	2,327	$	2,153	$	2,269		$	9,101
Net income (loss) (1) (2)	$	233	$	138	$	178	$	(70	)	$	479
Basic earnings (loss) per share	$	0.86	$	0.51	$	0.66	$	(0.26	)	$	1.77
Diluted earnings (loss) per share	$	0.86	$	0.51	$	0.66	$	(0.26	)	$	1.77

(1) Net income (loss) in the first quarter of 2016 and the second quarter of 2015 included a charge related to the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer in our Corporate & Other Non-Core segment.

(2) Net income (loss) in the fourth quarter of 2015 included a charge related to recognition of a premium deficiency in our long term care business.

133

Note R. Related Party Transactions

The Company reimburses Loews for, or pays directly, fees and expenses of investment facilities and services provided to the Company. The amounts incurred by the Company for these fees and expenses were $43 million, $39 million and $39 million for the years ended December 31, 2016, 2015 and 2014 and amounts due to Loews, included in Other liabilities and payable in the first quarter of the subsequent year, were $23 million and $21 million as of December 31, 2016 and 2015. In addition, the Company reimbursed Loews for general corporate services and related travel expenses of $1 million for the year ended December 31, 2016. The CNA Tax Group is included in the consolidated federal income tax return of Loews and its eligible subsidiaries, and the related payable to Loews, included in Other liabilities, was $28 million and $61 million as of December 31, 2016 and 2015. For a detailed description of the income tax agreement with Loews see Note D to the Consolidated Financial Statements. In addition, the Company writes, at standard rates, a limited amount of insurance for Loews and its subsidiaries. The earned premiums for the years ended December 31, 2016, 2015 and 2014 were $2 million.

CNA previously sponsored a stock ownership plan whereby the Company financed the purchase of Company common stock by certain former officers, including executive officers. Interest charged on the principal amount of these outstanding stock purchase loans is generally equivalent to the short term applicable federal rate in effect on the disbursement date of the loan, compounded semi-annually. Loans made pursuant to the plan were full recourse and secured by the stock purchased.

Note S. Organization Review

In 2016, the Company completed a comprehensive organization review intended to improve effectiveness and efficiency. The review resulted in the elimination of approximately 370 positions. The Company incurred employee termination costs as a result of these actions totaling approximately $19 million during the year ended December 31, 2016. The costs incurred to date are included in Total claims, benefits, and expenses on the consolidated Statements of Operations and have been allocated to the Company's reportable segments in a manner consistent with the Company's current allocation of personnel costs. The costs by reportable segment for the year ended December 31, 2016, are presented in the following table.

Year ended December 31
(In millions)	2016
Specialty	$	4
Commercial	14
International	—
Life & Group Non-Core	1
Corporate & Other Non-Core	—
Total organization review costs	$	19

134

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

CNA Financial Corporation

Chicago, Illinois

We have audited the accompanying consolidated balance sheets of CNA Financial Corporation (an affiliate of Loews Corporation) and subsidiaries (the “Company”) as of December 31, 2016 and 2015, and the related consolidated statements of operations, comprehensive (loss) income, cash flows, and stockholders' equity for each of the three years in the period ended December 31, 2016. Our audits also included the financial statement schedules listed in the Index at Item 15. We also have audited the Company's internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. The Company's management is responsible for these financial statements and financial statement schedules, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on these financial statements and financial statement schedules and an opinion on the Company's internal control over financial reporting based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. 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.

A company's internal control over financial reporting is a process designed by, or under the supervision of, the company's principal executive and principal financial officers, or persons performing similar functions, and effected by the company's board of directors, management, and other personnel 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 (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) 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 (3) 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 the inherent limitations of internal control over financial reporting, including the possibility of collusion or improper management override of controls, material misstatements due to error or fraud may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

135

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2016 and 2015, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2016, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, such financial statement schedules, when considered in relation to the basic consolidated financial statements taken as a whole, present fairly, in all material respects, the information set forth therein. Also, in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2016, based on the criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

/s/ DELOITTE & TOUCHE LLP

Chicago, Illinois

February 15, 2017

136

MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

The management of CNA Financial Corporation (CNAF or the Company) is responsible for establishing and maintaining adequate internal control over financial reporting. CNAF's internal control system was designed to provide reasonable assurance to the Company's management, its Audit Committee and Board of Directors regarding the preparation and fair presentation of published financial statements.

There are inherent limitations to the effectiveness of any internal control or system of control, however well designed, including the possibility of human error and the possible circumvention or overriding of such controls or systems. Moreover, because of changing conditions the reliability of internal controls may vary over time. As a result even effective internal controls can provide no more than reasonable assurance with respect to the accuracy and completeness of financial statements and their process of preparation.

CNAF management assessed the effectiveness of the Company's internal control over financial reporting as of December 31, 2016. In making this assessment, it has used the criteria set forth by the 2013 Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control - Integrated Framework. Based on those criteria and our assessment we believe that, as of December 31, 2016, the Company's internal control over financial reporting was effective.

CNAF's independent registered public accountant, Deloitte & Touche LLP, has issued an audit report on the Company's internal control over financial reporting. This report appears on page 135.

CNA Financial Corporation

Chicago, Illinois

February 15, 2017

137

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

None.

ITEM 9A. CONTROLS AND PROCEDURES

As of December 31, 2016, the Company's management, including the Company's Chief Executive Officer (CEO) and Chief Financial Officer (CFO), conducted an evaluation of the effectiveness of the Company's disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)). Based on this evaluation, the CEO and CFO have concluded that the Company's disclosure controls and procedures are effective.

Pursuant to Section 404 of the Sarbanes-Oxley Act of 2002, and the implementing rules of the Securities and Exchange Commission, the Company included a report of management's assessment of the design and effectiveness of its internal controls as part of this Annual Report on Form 10-K for the fiscal year ended December 31, 2016. Management's report and the independent registered public accounting firm's attestation report are included in Part II, Item 8 under the captions entitled “Management's Report on Internal Control Over Financial Reporting” and “Report of Independent Registered Public Accounting Firm” and are incorporated herein by reference.

There has been no change in the Company’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended December 31, 2016 that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

ITEM 9B. OTHER INFORMATION

None.

138

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

EXECUTIVE OFFICERS OF THE REGISTRANT

NAME	POSITION AND OFFICES HELD WITH REGISTRANT	AGE	FIRST BECAME EXECUTIVE OFFICER OF CNA	PRINCIPAL OCCUPATION DURING PAST FIVE YEARS
Dino E. Robusto (1)	Chief Executive Officer, CNA Financial Corporation	58	2016	Chairman of the Board and Chief Executive Officer of CNA Financial Corporation since November 2016. President of Commercial and Specialty Lines of the Chubb Group of Insurance Companies and Executive Vice President of Chubb Limited from 2013 through November 2015. President of Personal Lines and Claims of Chubb Limited from 2011 through 2013.
D. Craig Mense	Executive Vice President & Chief Financial Officer, CNA Financial Corporation	65	2004	Executive Vice President and Chief Financial Officer of CNA Financial Corporation.
David Brosnan	Chief Executive, CNA Europe and Hardy	54	2015	Chief Executive of CNA Europe since August 2014 and Chief Executive of Hardy since February 2014. Senior Vice President, Commercial from May 2013 through February 2014. President and CEO, ACE INA Insurance Canada and ACE INA Life Insurance, Canada from 2008 through May 2013.
Larry A. Haefner	Executive Vice President & Chief Actuary of the CNA insurance companies	60	2008	Executive Vice President & Chief Actuary of the CNA insurance companies.
Mark I. Herman	President and Chief Operating Officer, Specialty of the CNA insurance companies	58	2013	President and Chief Operating Officer, Specialty of the CNA insurance companies since January 1, 2013. Insurance Industry Consultant from June 2011 to December 2012.
Jonathan D. Kantor	Executive Vice President, General Counsel and Secretary, CNA Financial Corporation	61	1997	Executive Vice President, General Counsel and Secretary of CNA Financial Corporation.
Kevin Leidwinger	President and Chief Operating Officer, Commercial of the CNA insurance companies	53	2015	President and Chief Operating Officer, Commercial of the CNA insurance companies since June 2015. Global Casualty Manager for Chubb Commercial Insurance from April 2013 to June 2015. Global Liability Product Line Manager for Chubb Commercial Insurance from 2002 to 2013.
Albert J. Miralles	President, Long Term Care of the CNA insurance companies	47	2014	President, Long Term Care of the CNA insurance companies since March 2014. Senior Vice President and Treasurer of the CNA insurance companies from 2011 to March 2014.
Andrew J. Pinkes	Executive Vice President, Worldwide Property & Casualty Claim of the CNA insurance companies	54	2015	Executive Vice President, Worldwide Property & Casualty Claim of the CNA insurance companies since May 2015. Executive Vice President, Global Head of Claims for the XL Group from May 2013 to May 2015. Executive Vice President, Claims for The Hartford Financial Services Group, Inc. and President, Heritage Holdings, Inc. for Hartford from 2008 to 2013.
Timothy J. Szerlong	President, Worldwide Field Operations of the CNA insurance companies	64	2010	President, Worldwide Field Operations of the CNA insurance companies.

(1) Mr. Robusto assumed this role on November 21, 2016. Prior to this date, Thomas F. Motamed held this office.

Officers are elected annually and hold office until their successors are elected and qualified, and are subject to removal by the Board of Directors.

Additional information required in Part III, Item 10 has been omitted as we intend to include such information in our definitive proxy statement which will be filed with the Securities and Exchange Commission not later than 120 days after December 31, 2016.

139

ITEM 11. EXECUTIVE COMPENSATION

Information required in Part III, Item 11 has been omitted as we intend to include such information in our definitive proxy statement which will be filed with the Securities and Exchange Commission not later than 120 days after December 31, 2016.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

Equity Compensation Plan

The table below presents the securities authorized for issuance under equity compensation plans. Performance share units are included at the maximum potential payout percentage.

December 31, 2016	Number of securities to be issued upon exercise of outstanding options, warrants and rights	Weighted average exercise price of outstanding options, warrants and rights		Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))
Plan Category	(a)	(b)		(c)
Equity compensation plans approved by security holders	3,797,239	$	32.84	3,669,736
Equity compensation plans not approved by security holders	—	—		—
Total	3,797,239	$	32.84	3,669,736

Additional information required in Part III, Item 12 has been omitted as we intend to include such information in our definitive proxy statement which will be filed with the Securities and Exchange Commission not later than 120 days after December 31, 2016.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

Information required in Part III, Item 13 has been omitted as we intend to include such information in our definitive proxy statement which will be filed with the Securities and Exchange Commission not later than 120 days after December 31, 2016.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

Information required in Part III, Item 14 has been omitted as we intend to include such information in our definitive proxy statement which will be filed with the Securities and Exchange Commission not later than 120 days after December 31, 2016.

140

PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(1)    FINANCIAL STATEMENTS:

	Page Number
Consolidated Statements of Operations - Years ended December 31, 2016, 2015 and 2014	55
Consolidated Statements of Comprehensive (Loss) Income - Years ended December 31, 2016, 2015 and 2014	56
Consolidated Balance Sheets - December 31, 2016 and 2015	57
Consolidated Statements of Cash Flows - Years ended December 31, 2016, 2015, and 2014	58
Consolidated Statements of Stockholders' Equity - Years ended December 31, 2016, 2015 and 2014	60
Notes to Consolidated Financial Statements	61
Report of Independent Registered Public Accounting Firm	135
Management's Report on Internal Control Over Financial Reporting	137

(2)    FINANCIAL STATEMENT SCHEDULES:

Schedule I	Summary of Investments	145
Schedule II	Condensed Financial Information of Registrant (Parent Company)	145
Schedule III	Supplementary Insurance Information	149
Schedule IV	Reinsurance	149
Schedule V	Valuation and Qualifying Accounts	149
Schedule VI	Supplemental Information Concerning Property and Casualty Insurance Operations	150

(3)    EXHIBITS:

		Description of Exhibit	Exhibit Number
(3	)	Articles of incorporation and by-laws:
		Certificate of Incorporation of CNA Financial Corporation, as amended May 6, 1987 (Exhibit 3.1 to Form S-8 filed October 9, 1998 incorporated herein by reference)	3.1
		Certificate of Amendment of Certificate of Incorporation, dated May 14, 1998 (Exhibit 3.1a to 2006 Form 10-K incorporated herein by reference)	3.1.1
		Certificate of Amendment of Certificate of Incorporation, dated May 10, 1999 (Exhibit 3.1 to 1999 Form 10-K incorporated herein by reference)	3.1.2
		By-Laws of CNA Financial Corporation, as amended October 24, 2012 (Exhibit 3.1 to Form 8-K filed October 24, 2012 incorporated herein by reference)	3.2
(4	)	Instruments defining the rights of security holders, including indentures:*
		Registration Rights Agreement, dated August 8, 2006, between CNA Financial Corporation and Loews Corporation (Exhibit 10.1 to August 8, 2006 Form 8-K incorporated herein by reference)	4.1

141

(10	)	Material contracts:
		Credit Agreement among CNA Financial Corporation, Wells Fargo Securities, LLC, J.P. Morgan Securities LLC, Wells Fargo Bank, National Association, JPMorgan Chase Bank, N.A., Citibank, N.A., The Northern Trust Company, U.S. Bank National Association and other lenders named therein, dated August 28, 2015 (Exhibit 99.1 to August 28, 2015 Form 8-K incorporated herein by reference)	10.1
		Federal Income Tax Allocation Agreement, dated February 29, 1980 between CNA Financial Corporation and Loews Corporation (Exhibit 10.2 to 1987 Form 10-K incorporated herein by reference)	10.2
		Investment Facilities and Services Agreement, dated January 1, 2006, by and among Loews/CNA Holdings, Inc., CNA Financial Corporation and the Participating Subsidiaries (Exhibit 10.3 to 2007 Form 10-K incorporated herein by reference)	10.3
		Amendment to Investment Facilities and Services Agreement, dated January 1, 2007, by and among Loews/CNA Holdings, Inc. and CNA Financial Corporation (Exhibit 10.3.1 to 2007 Form 10-K incorporated herein by reference)	10.3.1
		CNA Financial Corporation Incentive Compensation Plan, as amended and restated, effective as of January 1, 2010 (Exhibit A to Form DEF 14A, filed April 2, 2010, incorporated herein by reference)	10.4	+
		First Amendment to the CNA Financial Corporation Incentive Compensation Plan, effective as of April 27, 2016	10.4.1
		CNA Supplemental Executive Retirement Plan, restated as of January 1, 2015 (Exhibit 10.5 to June 30, 2015 Form 10-Q incorporated herein by reference)	10.5	+
		CNA Non-Qualified Savings Plan (formerly known as the CNA Supplemental Executive Savings and Capital Accumulation Plan), restated as of January 1, 2014 (Exhibit 10.6 to June 30, 2015 Form 10-Q incorporated herein by reference)	10.6	+
		First Amendment to the CNA Non-Qualified Savings Plan, dated May 28, 2015 (Exhibit 10.6.1 to June 30, 2015 Form 10-Q incorporated herein by reference)	10.6.1	+
		Second Amendment to the CNA Non-Qualified Savings Plan, dated July 22, 2015 (Exhibit 10.6.2 to September 30, 2015 Form 10-Q incorporated herein by reference)	10.6.2	+
		Award Letter and Award Terms to Thomas F. Motamed for Restricted Stock Units (Exhibit 10.10 to 2010 Form 10-K incorporated herein by reference)	10.7	+
		Form of Award Letter to Executive Officers, along with Form of Award Terms, for the Long-Term Incentive Cash Plan (Exhibit 10.1 to June 30, 2010 Form 10-Q incorporated herein by reference)	10.8	+
		Form of Award Letter to Executive Officers, along with Form of Award Terms, relating to Stock Appreciation Rights (Exhibit 10.11.2 to 2010 Form 10-K incorporated herein by reference)	10.9	+
		Employment Agreement, dated May 22, 2008, by and between CNA Financial Corporation and Thomas F. Motamed (Exhibit 10.1 to June 30, 2008 Form 10-Q incorporated herein by reference)	10.10	+
		First Amendment to Employment Agreement, dated October 24, 2008, by and between CNA Financial Corporation and Thomas F. Motamed (Exhibit 10.6 to September 30, 2008 Form 10-Q incorporated herein by reference)	10.10.1	+

142

		Second Amendment to Employment Agreement, dated March 3, 2010, by and between CNA Financial Corporation and Thomas F. Motamed (Exhibit 10.1 to March 31, 2010 Form 10-Q incorporated herein by reference)	10.10.2	+
		Third Amendment to Employment Agreement, dated September 8, 2011, by and between CNA Financial Corporation and Thomas F. Motamed (Exhibit 10.1 to Form 8-K filed September 8, 2011 incorporated herein by reference)	10.10.3	+
		Fourth Amendment to Employment Agreement, dated October 24, 2016, between CNA Financial Corporation and Thomas F. Motamed (Exhibit 99.2 to Form 8-K filed October 24, 2016 incorporated herein by reference)	10.10.4	+
		Employment Agreement, dated November 13, 2015, between CNA Financial Corporation and Dino E. Robusto (Exhibit 10.1 to Form 8-K filed November 16, 2015 incorporated herein by reference)	10.11	+
		Retention Agreement, dated February 4, 2016, between Continental Casualty Company and D. Craig Mense (Exhibit 10.1 to Form 8-K filed February 9, 2016 incorporated herein by reference)	10.12	+
		Master Transaction Agreement, dated July 14, 2010, among Continental Casualty Company, The Continental Insurance Company, Continental Reinsurance Corporation International, Ltd., CNA Insurance Company Limited, National Indemnity Company and, solely for purposes of Sections 5.19 and 7.3(b) thereof, Berkshire Hathaway Inc. (Exhibit 10.1 to Form 8-K filed July 16, 2010 incorporated herein by reference)	10.13
		Administrative Services Agreement, dated August 31, 2010, among Continental Casualty Company, The Continental Insurance Company, Continental Reinsurance Corporation International, Ltd., CNA Insurance Company Limited and National Indemnity Company (Exhibit 10.1 to Form 8-K filed September 1, 2010 incorporated herein by reference)	10.14
		Collateral Trust Agreement, dated August 31, 2010, among Continental Casualty Company, The Continental Insurance Company, Continental Reinsurance Corporation International, Ltd., CNA Insurance Company Limited, National Indemnity Company and Wells Fargo Bank, National Association (Exhibit 10.2 to Form 8-K filed September 1, 2010 incorporated herein by reference)	10.15
		Loss Portfolio Transfer Reinsurance Agreement, dated August 31, 2010, among Continental Casualty Company, The Continental Insurance Company, Continental Reinsurance Corporation International, Ltd., CNA Insurance Company Limited and National Indemnity Company (Exhibit 10.3 to Form 8-K filed September 1, 2010 incorporated herein by reference)	10.16
		Amendment No. 1 to the Master Transaction Agreement, dated August 31, 2010, among Continental Casualty Company, The Continental Insurance Company, Continental Reinsurance Corporation International, Ltd., CNA Insurance Company Limited and National Indemnity Company (Exhibit 10.4 to Form 8-K filed September 1, 2010 incorporated herein by reference)	10.17
		Parental Guarantee Agreement, dated August 31, 2010, made by Berkshire Hathaway Inc. in favor of Continental Casualty Company, The Continental Insurance Company, Continental Reinsurance Corporation International, Ltd. and CNA Insurance Company Limited (Exhibit 10.5 to Form 8-K filed September 1, 2010 incorporated herein by reference)	10.18
(21	)	Subsidiaries of the Registrant
		List of subsidiaries of the Registrant	21.1

143

(23	)	Consent of Experts and Counsel
		Consent of Independent Registered Public Accounting Firm	23.1
(31	)	Rule 13a-14(a)/15d-14(a) Certifications
		Certification of Chief Executive Officer	31.1
		Certification of Chief Financial Officer	31.2
(32	)	Section 1350 Certifications
		Written Statement of the Chief Executive Officer of CNA Financial Corporation Pursuant to 18 U.S.C. Section 1350 (As adopted by Section 906 of the Sarbanes-Oxley Act of 2002)	32.1
		Written Statement of the Chief Financial Officer of CNA Financial Corporation Pursuant to 18 U.S.C. Section 1350 (As adopted by Section 906 of the Sarbanes-Oxley Act of 2002)	32.2
(101	)	XBRL - Interactive Data File
		XBRL Instance Document	101.INS
		XBRL Taxonomy Extension Schema	101.SCH
		XBRL Taxonomy Extension Calculation Linkbase	101.CAL
		XBRL Taxonomy Extension Definition Linkbase	101.DEF
		XBRL Taxonomy Label Linkbase	101.LAB
		XBRL Taxonomy Extension Presentation Linkbase	101.PRE
		* CNA Financial Corporation hereby agrees to furnish to the Commission upon request copies of instruments with respect to long term debt, pursuant to Item 601(b)(4) (iii) of Regulation S-K.
		+ Management contract or compensatory plan or arrangement.
		Except for Exhibits 21.1, 23.1, 31.1, 31.2, 32.1, 32.2 and the XBRL documents as discussed in the note above, the exhibits above are not included in this report, but are on file with the SEC.

144

SCHEDULE I. SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES

Incorporated herein by reference to Note B to the Consolidated Financial Statements included under Item 8.

SCHEDULE II. CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY)

CNA Financial Corporation

Statements of Operations and Comprehensive Income (Loss)

Years ended December 31
(In millions)	2016			2015			2014
Revenues
Net investment income	$	3		$	1		$	1
Net realized investment (losses) gains	(7		)	5			4
Total revenues	(4		)	6			5
Expenses
Administrative and general	1			1			5
Interest	155			154			182
Total expenses	156			155			187
Loss from operations before income taxes and equity in net income of subsidiaries	(160		)	(149		)	(182		)
Income tax benefit	41			34			35
Loss before equity in net income of subsidiaries	(119		)	(115		)	(147		)
Equity in net income of subsidiaries	978			594			838
Net income	859			479			691
Equity in other comprehensive income of subsidiaries	142			(715		)	(42		)
Total Comprehensive Income (Loss)	$	1,001		$	(236	)	$	649

See accompanying Notes to Condensed Financial Information as well as the

Consolidated Financial Statements and accompanying Notes.

145

CNA Financial Corporation

Balance Sheets

December 31
(In millions, except share data)	2016			2015
Assets
Investment in subsidiaries	$	14,202		$	13,851
Cash	1			4
Short term investments	487			478
Amounts due from affiliates	6			—
Other assets	1			1
Total assets	$	14,697		$	14,334
Liabilities
Short term debt	$	—		$	350
Long term debt	2,680			2,180
Other liabilities	48			48
Total liabilities	2,728			2,578
Stockholders' Equity
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,495,998 and 270,274,361 shares outstanding)	683			683
Additional paid-in capital	2,173			2,153
Retained earnings	9,359			9,313
Accumulated other comprehensive income	(173		)	(315		)
Treasury stock (2,544,245 and 2,765,882 shares), at cost	(73		)	(78		)
Total stockholders' equity	11,969			11,756
Total liabilities and stockholders' equity	$	14,697		$	14,334

See accompanying Notes to Condensed Financial Information as well as the

Consolidated Financial Statements and accompanying Notes.

146

CNA Financial Corporation

Statements of Cash Flows

Years ended December 31
(In millions)	2016			2015			2014
Cash Flows from Operating Activities
Net income	$	859		$	479		$	691
Adjustments to reconcile net income to net cash flows provided by operating activities:
Equity in net income of subsidiaries	(978		)	(594		)	(838		)
Dividends received from subsidiaries	765			900			650
Net realized investment losses (gains)	7			(5		)	(4		)
Other, net	21			4			14
Total adjustments	(185		)	305			(178		)
Net cash flows provided by operating activities	674			784			513
Cash Flows from Investing Activities
Change in short term investments	(9		)	21			6
Capital contributions to subsidiaries	—			—			(10		)
Other, net	4			7			5
Net cash flows (used) provided by investing activities	(5		)	28			1
Cash Flows from Financing Activities
Dividends paid to common stockholders	(813		)	(811		)	(541		)
Proceeds from the issuance of debt	498			—			546
Repayment of debt	(358		)	—			(549		)
Stock options exercised	—			1			5
Other, net	1			1			25
Net cash flows used by financing activities	(672		)	(809		)	(514		)
Net change in cash	(3		)	3			—
Cash, beginning of year	4			1			1
Cash, end of year	$	1		$	4		$	1

See accompanying Notes to Condensed Financial Information as well as the

Consolidated Financial Statements and accompanying Notes.

147

Notes to Condensed Financial Information

A. Summary of Significant Accounting Policies

Basis of Presentation

The condensed financial information of CNA Financial Corporation (CNAF or the Parent Company) should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in Item 8 of this Form 10-K. CNAF’s subsidiaries are accounted for using the equity method of accounting. Equity in net income of these subsidiaries is presented on the Condensed Statements of Operations as Equity in net income of subsidiaries. Loews owned approximately 90% of the outstanding common stock of CNAF as of December 31, 2016.

Recently Adopted Accounting Standards Updates (ASU)

In April 2015, the Financial Accounting Standards Board (FASB) issued ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The updated accounting guidance requires debt issuance costs to be presented as a deduction from the corresponding debt liability instead of the historical presentation as an unamortized debt issuance asset. As of January 1, 2016, the Parent Company adopted the updated accounting guidance retrospectively. The Parent Company adjusted its previously reported financial information included herein to reflect the change in accounting guidance for debt issuance costs. The impacts of adopting the new accounting standard on the Parent Company’s Consolidated Balance Sheet as of December 31, 2015, were a decrease in Other assets and a decrease in Long term debt of $2 million.

B. Commitments, Contingencies and Guarantees

As of December 31, 2016 and 2015 CNAF had recorded liabilities of approximately $5 million related to guarantee agreements. The Parent Company believes that it is not likely that any future indemnity claims will be significantly greater than the amounts recorded.

In the course of selling business entities and assets to third parties, CNAF has agreed to guarantee the performance of certain obligations of both a previously owned subsidiary and a current subsidiary. Such obligations include agreement to indemnify purchasers for losses arising out of breaches of representation and warranties with respect to the business entities or assets sold, including, in certain cases, losses arising from undisclosed liabilities or certain named litigation. The guarantee agreements may include provisions that survive indefinitely. As of December 31, 2016, the aggregate amount of quantifiable guarantee agreements in effect for sales of business entities, assets and third-party loans was $625 million. Should the company be required to make payments under the guarantee, it would have the right to seek reimbursement in certain cases from an affiliate of a previously owned subsidiary.

In addition, CNAF has agreed to provide indemnification to third-party purchasers for certain losses associated with sold business entities or assets that are not limited by a contractual monetary amount. As of December 31, 2016, CNAF had outstanding unlimited indemnifications in connection with the sales of certain of its business entities or assets that included tax liabilities arising prior to a purchaser’s ownership of an entity or asset, defects in title at the time of sale, employee claims arising prior to closing and in some cases losses arising from certain litigation and undisclosed liabilities. These indemnification agreements survive until the applicable statutes of limitation expire or until the agreed upon contract terms expire.

CNAF also provided guarantees, if the primary obligor fails to perform, to holders of structured settlement annuities provided by a previously owned subsidiary. As of December 31, 2016, the potential amount of future payments CNAF could be required to pay under these guarantees was approximately $1.9 billion, which will be paid over the lifetime of the annuitants. The Parent Company does not believe a payable is likely under these guarantees, as it is the beneficiary of a trust that must be maintained at a level that approximates the discounted reserves for these annuities.

148

SCHEDULE III. SUPPLEMENTARY INSURANCE INFORMATION

Incorporated herein by reference to Note O to the Consolidated Financial Statements included under Item 8.

SCHEDULE IV. REINSURANCE

Incorporated herein by reference to Note G to the Consolidated Financial Statements included under Item 8.

SCHEDULE V. VALUATION AND QUALIFYING ACCOUNTS

(In millions)	Balance at Beginning of Period		Charged to Costs and Expenses			Charged to Other Accounts (1)			Deductions			Balance at End of Period
Year ended December 31, 2016
Deducted from assets:
Allowance for doubtful accounts:
Insurance and reinsurance receivables	$	89	$	(2	)	$	(1	)	$	(3	)	$	83
Year ended December 31, 2015
Deducted from assets:
Allowance for doubtful accounts:
Insurance and reinsurance receivables	$	109	$	(12	)	$	—		$	(8	)	$	89
Year ended December 31, 2014
Deducted from assets:
Allowance for doubtful accounts:
Insurance and reinsurance receivables	$	155	$	(40	)	$	(1	)	$	(5	)	$	109

(1)    Amount includes effects of foreign currency translation.

149

SCHEDULE VI. SUPPLEMENTAL INFORMATION CONCERNING PROPERTY AND CASUALTY INSURANCE OPERATIONS

As of and for the years ended December 31	Consolidated Property and Casualty Operations
(In millions)	2016			2015			2014
Balance Sheet Data
Deferred acquisition costs	$	599		$	597
Reserves for unpaid claim and claim adjustment expenses	22,343			22,663
Discount deducted from claim and claim adjustment expense reserves above (based on interest rates ranging from 3.5% to 8.0%)	1,572			1,534
Unearned premiums	3,762			3,671
Statement of Operations Data
Net written premiums	$	6,988		$	6,962		$	7,088
Net earned premiums	6,924			6,921			7,212
Net investment income	1,952			1,807			2,031
Incurred claim and claim adjustment expenses related to current year	5,025			4,934			5,043
Incurred claim and claim adjustment expenses related to prior years	(342		)	(255		)	(39		)
Amortization of deferred acquisition costs	1,235			1,540			1,317
Paid claim and claim adjustment expenses	5,134			4,945			5,297

150

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		CNA Financial Corporation
Dated: February 15, 2017	By	/s/ Dino E. Robusto
		Dino E. Robusto Chief Executive Officer (Principal Executive Officer)
Dated: February 15, 2017	By	/s/ D. Craig Mense
		D. Craig Mense Executive Vice President and Chief Financial Officer (Principal Financial & Accounting Officer)

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 registrant and in the capacities and on the date indicated.

Dated: February 15, 2017	By	/s/ Dino E. Robusto
		(Dino E. Robusto, Chief Executive Officer and Chairman of the Board of Directors)
Dated: February 15, 2017	By	/s/ Jose O. Montemayor
		(Jose O. Montemayor, Director)
Dated: February 15, 2017	By	/s/ Don M. Randel
		(Don M. Randel, Director)
Dated: February 15, 2017	By	/s/ Joseph Rosenberg
		(Joseph Rosenberg, Director)
Dated: February 15, 2017	By	/s/ Andrew H. Tisch
		(Andrew H. Tisch, Director)
Dated: February 15, 2017	By	/s/ James S. Tisch
		(James S. Tisch, Director)
Dated: February 15, 2017	By	/s/ Marvin Zonis
		(Marvin Zonis, Director)

151

EX-10.4.1

EXHIBIT 10.4.1

FIRST AMENDMENT TO THE

CNA FINANCIAL CORPORATION INCENTIVE COMPENSATION PLAN

The CNA FINANCIAL CORPORATION INCENTIVE COMPENSATION PLAN, as amended and restated effective January 1, 2010, is hereby amended as follows:

1. Section 3.3 is amended in its entirety to read as follows:

3.3. Grant of Awards by Chief Executive Officer. Unless otherwise determined by the Committee, and to the extent permitted by applicable law, the Chief Executive Officer of the Company shall have the power and authority to grant Awards to any Eligible Persons, so long as such Eligible Persons are not officers or directors with reporting obligations under Section 16 of the Securities Exchange Act of 1934, as amended, and to determine the terms and conditions of any such Awards. The Chief Executive Officer, or such other officer as the Chief Executive Officer may designate, may exercise in his or her sole discretion all power and authority of the Committee with respect to such Awards except as otherwise specified in this Plan or by the Committee. Awards granted by the Chief Executive Officer pursuant to this Section 3.3, or by any officer, committee or other person (including the Chief Executive Officer) pursuant to Section 3.2(j), shall be treated as Awards granted by the Committee for all purposes of this Plan, except as otherwise specified herein, and any action taken by the Committee with respect to all Awards, including any action taken pursuant to Section 4.2, shall apply to Awards granted pursuant to this Section 3.3 or Section 3.2(j), unless otherwise specified by the Committee.

2.    Section 4.1 is amended by replacing the first two sentences with the following:

Subject to Section 4.4 and to adjustment as provided in Section 4.2, the number of Shares reserved for delivery under this Plan shall be 11,000,000.

3.    Except as otherwise provided herein, the Plan shall remain in full force and effect.

IN WITNESS WHEREOF, CNA Financial Corporation has caused this First Amendment to be effective as of April 27, 2016.

CNA FINANCIAL CORPORATION

By	/s/ Jonathan D. Kantor
	Jonathan D. Kantor, Executive Vice President
	General Counsel and Secretary

EX-21.1

EXHIBIT 21.1

CNA FINANCIAL CORPORATION

Subsidiaries of the Registrant

As of December 31, 2016

Name of Subsidiary	Organized Under Laws of
American Casualty Company of Reading, Pennsylvania	Pennsylvania
CNA Insurance Company Limited	United Kingdom
Columbia Casualty Company	Illinois
Continental Casualty Company	Illinois
Continental Reinsurance Corporation International, Ltd	Bermuda
Hardy Guernsey Limited	Guernsey
National Fire Insurance Company of Hartford	Illinois
North Rock Insurance Company Limited	Bermuda
Surety Bonding Company of America	South Dakota
The Continental Corporation	New York
The Continental Insurance Company	Pennsylvania
The Continental Insurance Company of New Jersey	New Jersey
Transportation Insurance Company	Illinois
Universal Surety of America	South Dakota
Valley Forge Insurance Company	Pennsylvania
Western Surety Company	South Dakota

The names of certain subsidiaries which, if considered in the aggregate as a single subsidiary, would not constitute a “significant subsidiary” as defined in Regulation S-X, have been omitted.

EX-23.1

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-210531 on Form S-3 and Registration Statement Nos. 333-166360 and 333-211150 on Form S-8 of our report dated February 15, 2017, relating to the consolidated financial statements and financial statement schedules of CNA Financial Corporation and subsidiaries (the “Company”), and the effectiveness of the Company's internal control over financial reporting, appearing in this Annual Report on Form 10-K of the Company for the year ended December 31, 2016.

/s/ DELOITTE & TOUCHE LLP

Chicago, Illinois

February 15, 2017

EX-31.1

EXHIBIT 31.1

SARBANES-OXLEY ACT SECTION 302

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Dino E. Robusto, certify that:

1. I have reviewed this Annual Report on Form 10-K of CNA Financial Corporation;

2. Based on my knowledge, this 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 officers 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 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 officers 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 registrant’s board of directors (or persons performing the equivalent function):

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.

Dated:	February 15, 2017	By	/s/ Dino E. Robusto
			Dino E. Robusto
			Chief Executive Officer

EX-31.2

EXHIBIT 31.2

SARBANES-OXLEY ACT SECTION 302

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, D. Craig Mense, certify that:

1. I have reviewed this Annual Report on Form 10-K of CNA Financial Corporation;

2. Based on my knowledge, this 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 officers 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 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 officers 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 registrant’s board of directors (or persons performing the equivalent function):

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.

Dated:	February 15, 2017	By	/s/ D. Craig Mense
			D. Craig Mense
			Chief Financial Officer

EX-32.1

EXHIBIT 32.1

Written Statement of the Chief Executive Officer

of CNA Financial Corporation

Pursuant to 18 U.S.C. § 1350

(As adopted by Section 906 of the Sarbanes-Oxley Act of 2002)

The undersigned, the Chief Executive Officer of CNA Financial Corporation (the Company), hereby certifies that, to his knowledge:

• the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 filed on the date hereof with the Securities and Exchange Commission (the Report) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

• the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:	February 15, 2017	By	/s/ Dino E. Robusto
			Dino E. Robusto
			Chief Executive Officer

The foregoing certification is being furnished solely pursuant to 18 U.S.C. § 1350 and is not being filed as part of the Report or as a separate disclosure document.

EX-32.2

EXHIBIT 32.2

Written Statement of the Chief Financial Officer

of CNA Financial Corporation

Pursuant to 18 U.S.C. § 1350

(As adopted by Section 906 of the Sarbanes-Oxley Act of 2002)

The undersigned, the Chief Financial Officer of CNA Financial Corporation (the Company), hereby certifies that, to his knowledge:

• the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 filed on the date hereof with the Securities and Exchange Commission (the Report) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

• the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:	February 15, 2017	By	/s/ D. Craig Mense
			D. Craig Mense
			Chief Financial Officer

The foregoing certification is being furnished solely pursuant to 18 U.S.C. § 1350 and is not being filed as part of the Report or as a separate disclosure document.

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Document and Entity Information Document $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) shares
Document and Entity Information [Abstract]
Entity Registrant Name	CNA FINANCIAL CORP
Entity Central Index Key	0000021175
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding | shares	270,495,998
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float | $	$ 844

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Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Revenues
Net earned premiums	$ 6,924		$ 6,921		$ 7,212
Net Investment Income	1,988		1,840		2,067
Net realized investment gains (losses):
Other-than-temporary impairment losses	(81)		(156)		(77)
Other net realized investment gains (loss)	131		89		134
Net realized investment gains (losses)	50		(67)		57
Other revenues	404		407		356
Total revenues	9,366		9,101		9,692
Claims, Benefits and Expenses
Insurance claims and policyholders' benefits	5,283		5,384		5,591
Amortization of deferred acquisition costs	1,235		1,540		1,317
Other operating expenses	1,552		1,473		1,394
Interest	159		155		183
Total claims, benefits and expenses	8,229		8,552		8,485
Income (loss) from continuing operations before income tax	1,137		549		1,207
Income tax expense (benefit)	(278)		(70)		(319)
Net income (loss) from continuing operations	859		479		888
(Loss) income from discontinued operations, net of income tax benefit (expense)	0		0		(197)
Net income (loss)	$ 859	[1]	$ 479	[1],[2]	$ 691
Basic Earnings (Loss) Per Share Attributable to CNA
Income (loss) from continuing operations	$ 3.18		$ 1.77		$ 3.29
(Loss) income from discontinued operations	0.00		0.00		(0.73)
Basic earnings (loss) per share	3.18		1.77		2.56
Diluted Earnings (Loss) Per Share Attributable to CNA
Income (loss) from continuing operations	3.17		1.77		3.28
(Loss) income from discontinued operations	0.00		0.00		(0.73)
Diluted earnings (loss) per share	3.17		1.77		2.55
Dividends per share	$ 3.00		$ 3.00		$ 2.00
Weighted Average Outstanding Common Stock and Common Stock Equivalents
Basic	270.4		270.2		269.9
Diluted	271.1		270.7		270.6

[1] Net income (loss) in the first quarter of 2016 and the second quarter of 2015 included a charge related to the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer in our Corporate & Other Non-Core segment.

[2] Net income (loss) in the fourth quarter of 2015 included a charge related to recognition of a premium deficiency in our long term care business.

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Consolidated Statements of Operations Parenthetical (Parentheticals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Income tax benefit (expense) on discontinued operations	$ 0	$ 0	$ 34

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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 859	[1]	$ 479	[1],[2]	$ 691
Other Comprehensive Income (Loss), Net of Tax, Changes In:
Net unrealized gains (losses) on investments with other-than-temporary impairments	3		(9)		15
Net unrealized gains (losses) on other investments	252		(552)		267
Net unrealized gains (losses) on investments	255		(561)		282
Net unrealized losses on discontinued operations	0		0		(22)
Foreign currency translation adjustment	(114)		(139)		(95)
Pension and postretirement benefits	1		(15)		(207)
Other comprehensive income (loss), net of tax	142		(715)		(42)
Total comprehensive income (loss)	$ 1,001		$ (236)		$ 649

[1] Net income (loss) in the first quarter of 2016 and the second quarter of 2015 included a charge related to the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer in our Corporate & Other Non-Core segment.

[2] Net income (loss) in the fourth quarter of 2015 included a charge related to recognition of a premium deficiency in our long term care business.

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Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Assets
Fixed maturity securities at fair value (amortized cost of $38,361 and $37,253)	$ 40,905	$ 39,572
Equity securities at fair value (cost of $106 and $191)	110	197
Limited partnership investments	2,371	2,548
Other invested assets	36	44
Mortgage loans	591	678
Short term investments	1,407	1,660
Total investments	45,420	44,699
Cash	271	387
Reinsurance receivables (less allowance for uncollectible receivables of $37 and $38)	4,416	4,453
Insurance receivables (less allowance for uncollectible receivables of $46 and $51)	2,209	2,078
Accrued investment income	405	404
Deferred acquisition costs	600	598
Deferred income taxes	379	638
Property and equipment at cost (less accumulated depreciation of $254 and $382)	310	343
Goodwill	145	150
Other assets	1,078	1,295
Total assets	55,233	55,045
Liabilities
Claim and claim adjustment expenses	22,343	22,663
Unearned premiums	3,762	3,671
Future policy benefits	10,326	10,152
Short term debt	0	350
Long term debt	2,710	2,210
Other liabilities (includes $50 and $82 due to Loews Corporation)	4,123	4,243
Total liabilities	43,264	43,289
Stockholders' Equity
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,495,998 and 270,274,361 shares outstanding)	683	683
Additional paid-in capital	2,173	2,153
Retained earnings	9,359	9,313
Accumulated other comprehensive income (loss)	(173)	(315)
Treasury stock (2,544,245 and 2,765,882 shares), at cost	(73)	(78)
Total stockholders’ equity	11,969	11,756
Total liabilities and stockholders' equity	$ 55,233	$ 55,045

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Consolidated Balance Sheet Parentheticals (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Fixed maturities securities at amortized cost	$ 38,361	$ 37,253
Equity securities at cost	106	191
Allowance for uncollectible reinsurance receivables	37	38
Allowance for uncollectible insurance receivables	46	51
Accumulated depreciation on property and equipment	254	382
Due to Related Parties	$ 50	$ 82
Common stock, par value	$ 2.50	$ 2.50
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	273,040,243	273,040,243
Common stock, shares outstanding	270,495,998	270,274,361
Treasury stock, shares	2,544,245	2,765,882

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Cash Flows from Operating Activities
Net income (loss)	$ 859	[1]	$ 479	[1],[2]	$ 691
Adjustments to reconcile net income (loss) to net cash flows provided (used) by operating activities:
Loss on sale of subsidiaries	0		0		251
Deferred income tax expense (benefit)	136		(150)		3
Trading portfolio activity	(9)		17		16
Net Realized Investment Gains Losses Continuing And Discontinuing Operations	50		(67)		60
Equity method investees	238		195		83
Amortization of investments	(27)		17		3
Depreciation and amortization	77		84		83
Changes in:
Receivables, net	(130)		82		731
Accrued investment income	(3)		(1)		0
Deferred acquisition costs	(8)		311		44
Insurance reserves	237		241		(363)
Other assets	(95)		(79)		(48)
Other liabilities	162		126		(48)
Other, net	29		(2)		54
Total adjustments	557		908		749
Net cash flows provided (used) by operating activities	1,416		1,387		1,440
Dispositions:
Fixed maturity securities - sales	5,328		4,390		4,914
Fixed maturity securities - maturities, calls and redemptions	3,219		4,095		3,983
Equity securities	81		57		31
Limited partnerships	290		174		167
Mortgage loans	207		26		57
Purchases:
Fixed maturity securities	(9,827)		(8,675)		(9,365)
Equity securities	0		(62)		(67)
Limited partnerships	(252)		(188)		(271)
Mortgage loans	(120)		(123)		(137)
Change in other investments	7		4		15
Change in short term investments	258		34		(388)
Purchases of property and equipment	(146)		(125)		(71)
Proceeds from Sale of Property, Plant, and Equipment	107		0		0
Proceeds from sale of subsidiaries	0		0		198
Other, net	2		21		16
Net cash flows provided (used) by investing activities	(846)		(372)		(918)
Cash Flows from Financing Activities
Dividends paid to common stockholders	(813)		(811)		(541)
Proceeds from the issuance of debt	498		0		546
Repayment of debt	(358)		0		(549)
Other, net	0		4		25
Net cash flows provided (used) by financing activities	(673)		(807)		(519)
Effect of foreign exchange rate changes on cash	(13)		(11)		(8)
Net change in cash	(116)		197		(5)
Cash, beginning of year	387		190		195
Cash, end of year	$ 271		$ 387		$ 190

[1] Net income (loss) in the first quarter of 2016 and the second quarter of 2015 included a charge related to the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer in our Corporate & Other Non-Core segment.

[2] Net income (loss) in the fourth quarter of 2015 included a charge related to recognition of a premium deficiency in our long term care business.

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Consolidated Statements of Stockholders' Equity $ in Millions	USD ($)
Balance, beginning of year at Dec. 31, 2013	$ 683
Balance, end of year at Dec. 31, 2014	683
Balance, beginning of year at Dec. 31, 2013	2,145
Additional Paid-In Capital
Stock-based compensation	6
Balance, end of year at Dec. 31, 2014	2,151
Balance, beginning of year at Dec. 31, 2013	9,495
Retained Earnings (Accumulated Deficit)
Dividends paid to common stockholders	(541)
Net income (loss)	691
Balance, end of year at Dec. 31, 2014	9,645
Accumulated other comprehensive income (loss), beginning balance at Dec. 31, 2013	442
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	(42)
Accumulated other comprehensive income (loss), ending balance at Dec. 31, 2014	400
Balance, beginning of year at Dec. 31, 2013	(91)
Treasury Stock
Stock Based Compensation and Other	7
Balance, end of year at Dec. 31, 2014	(84)
Balance, beginning of year at Dec. 31, 2013	(23)
Notes Receivable for the Issuance of Common Stock
(Decrease) increase in notes receivable from the issuance of common stock	22
Balance, end of year at Dec. 31, 2014	(1)
Notes Receivable for the Issuance of Common Stock
Total stockholder's equty	12,794
Balance, end of year at Dec. 31, 2015	683
Additional Paid-In Capital
Stock-based compensation	2
Balance, end of year at Dec. 31, 2015	2,153
Retained Earnings (Accumulated Deficit)
Dividends paid to common stockholders	(811)
Net income (loss)	479	[1],[2]
Balance, end of year at Dec. 31, 2015	9,313
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	(715)
Accumulated other comprehensive income (loss), ending balance at Dec. 31, 2015	(315)
Treasury Stock
Stock Based Compensation and Other	6
Balance, end of year at Dec. 31, 2015	(78)
Notes Receivable for the Issuance of Common Stock
(Decrease) increase in notes receivable from the issuance of common stock	1
Balance, end of year at Dec. 31, 2015	0
Notes Receivable for the Issuance of Common Stock
Total stockholder's equty	11,756
Balance, end of year at Dec. 31, 2016	683
Additional Paid-In Capital
Stock-based compensation	20
Balance, end of year at Dec. 31, 2016	2,173
Retained Earnings (Accumulated Deficit)
Dividends paid to common stockholders	(813)
Net income (loss)	859	[1]
Balance, end of year at Dec. 31, 2016	9,359
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	142
Accumulated other comprehensive income (loss), ending balance at Dec. 31, 2016	(173)
Treasury Stock
Stock Based Compensation and Other	5
Balance, end of year at Dec. 31, 2016	(73)
Notes Receivable for the Issuance of Common Stock
(Decrease) increase in notes receivable from the issuance of common stock	0
Total stockholder's equty	$ 11,969

[1] Net income (loss) in the first quarter of 2016 and the second quarter of 2015 included a charge related to the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer in our Corporate & Other Non-Core segment.

[2] Net income (loss) in the fourth quarter of 2015 included a charge related to recognition of a premium deficiency in our long term care business.

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Notes)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

Note A. Summary of Significant Accounting Policies

Basis of Presentation

The Consolidated Financial Statements include the accounts of CNA Financial Corporation (CNAF) and its subsidiaries. Collectively, CNAF and its subsidiaries are referred to as CNA or the Company. Loews Corporation (Loews) owned approximately 90% of the outstanding common stock of CNAF as of December 31, 2016.

The accompanying Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). Intercompany amounts have been eliminated. The preparation of Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

Sale of Continental Assurance Company (CAC)

On August 1, 2014, the Company completed the sale of CAC. The business sold, which was previously reported within the Life & Group Non-Core segment, is reported as discontinued operations. The Company elected to include CAC cash flow activity in the comparative Consolidated Statements of Cash Flow. Further information related to the sale of CAC is provided in Note P to the Consolidated Financial Statements.

In connection with the sale of CAC, the Company entered into a 100% coinsurance agreement on a separate small block of annuity business outside of CAC. The coinsurance agreement required the transfer of assets with a book value equal to the ceded reserves on the inception date of the contract. Because a substantial portion of the assets supporting these liabilities are held in trust for the benefit of the original cedant, those assets were transferred on a funds withheld basis. Under this approach the Company maintains legal ownership of the assets, but the investment income and realized gains and losses on those assets inure to the reinsurer. As a result, the $34 million difference between market value and book value of the funds withheld assets at the coinsurance contract's inception was recognized as a loss in Other operating expenses in 2014. The funds withheld aspect of the agreement is considered an embedded derivative. The embedded derivative is separately accounted for at fair value and reported with the host contract in Other liabilities on the Company's Consolidated Balance Sheet. The Company recognizes Other operating expense equal to the Net investment income generated by these trust assets.

Insurance Operations

Premiums: Insurance premiums on property and casualty insurance contracts are recognized in proportion to the underlying risk insured and are principally earned ratably over the duration of the policies. Premiums on long term care contracts are earned ratably over the policy year in which they are due. The reserve for unearned premiums represents the portion of premiums written relating to the unexpired terms of coverage.

Insurance receivables include balances due currently or in the future, including amounts due from insureds related to losses under high deductible policies, and are presented at unpaid balances, net of an allowance for uncollectible receivables. Amounts are considered past due based on policy payment terms. The allowance is determined based on periodic evaluations of aged receivables, management's experience and current economic conditions. Insurance receivables and any related allowance are written off after collection efforts are exhausted or a negotiated settlement is reached.

Property and casualty contracts that are retrospectively rated contain provisions that result in an adjustment to the initial policy premium depending on the contract provisions and loss experience of the insured during the experience period. For such contracts, the Company estimates the amount of ultimate premiums that the Company may earn upon completion of the experience period and recognizes either an asset or a liability for the difference between the initial policy premium and the estimated ultimate premium. The Company adjusts such estimated ultimate premium amounts during the course of the experience period based on actual results to date. The resulting adjustment is recorded as either a reduction of or an increase to the earned premiums for the period.

Claim and claim adjustment expense reserves: Claim and claim adjustment expense reserves, except reserves for structured settlements not associated with asbestos and environmental pollution (A&EP), workers' compensation lifetime claims and long term care claims, are not discounted and are based on 1) case basis estimates for losses reported on direct business, adjusted in the aggregate for ultimate loss expectations; 2) estimates of incurred but not reported (IBNR) losses; 3) estimates of losses on assumed reinsurance; 4) estimates of future expenses to be incurred in the settlement of claims; 5) estimates of salvage and subrogation recoveries and 6) estimates of amounts due from insureds related to losses under high deductible policies. Management considers current conditions and trends as well as past Company and industry experience in establishing these estimates. The effects of inflation, which can be significant, are implicitly considered in the reserving process and are part of the recorded reserve balance. Ceded claim and claim adjustment expense reserves are reported as a component of Reinsurance receivables on the Consolidated Balance Sheets.

Claim and claim adjustment expense reserves are presented net of anticipated amounts due from insureds related to losses under deductible policies of $1.2 billion and $1.2 billion as of December 31, 2016 and 2015. A significant portion of these amounts are supported by collateral. The Company has an allowance for uncollectible deductible amounts, which is presented as a component of the allowance for doubtful accounts included in Insurance receivables onthe Consolidated Balance Sheets.

Structured settlements have been negotiated for certain property and casualty insurance claims. Structured settlements are agreements to provide fixed periodic payments to claimants. The Company's obligations for structured settlements not funded by annuities are included in claim and claim adjustment expense reserves and carried at present values determined using interest rates ranging from to 5.5% to 8.0% as of December 31, 2016 and 2015. As of December 31, 2016 and 2015, the discounted reserves for unfunded structured settlements were $544 million and $560 million, net of discount of $841 million and $880 million. For the years ended December 31, 2016, 2015 and 2014, the amount of interest recognized on the discounted reserves of unfunded structured settlements was $42 million, $42 million and $43 million, respectively. This interest accretion is presented as a component of Insurance claims and policyholders’ benefits on the Consolidated Statements of Operations, but is excluded from the Company’s disclosure of prior year development.

Workers' compensation lifetime claim reserves are calculated using mortality assumptions determined through statutory regulation and economic factors. At December 31, 2016 and 2015, workers' compensation lifetime claim reserves are discounted at a 3.5% interest rate. As of December 31, 2016 and 2015, the discounted reserves for workers’ compensation lifetime claim reserves were $371 million and $396 million, net of discount of $202 million and $218 million. For the years ended December 31, 2016, 2015 and 2014 the amount of interest accretion recognized on the discounted reserves of workers’ compensation lifetime claim reserves was $17 million, $20 million and $22 million, respectively.

Long term care claim reserves are calculated using mortality and morbidity assumptions based on Company and industry experience. Long term care claim reserves are discounted at interest rates ranging from 4.5% to 6.8% as of December 31, 2016 and 2015. As of December 31, 2016 and 2015, such discounted reserves totaled $2.2 billion and $2.2 billion, net of discount of $529 million and $435 million.

Future policy benefits reserves: Future policy benefits reserves represent the active life reserves related to the Company's long term care policies and are computed using the net level premium method, which incorporates actuarial assumptions as to morbidity, persistency, discount rate and expenses. Expense assumptions primarily relate to claim adjudication. Actuarial assumptions generally vary by plan, age at issue, policy duration and gender. The initial assumptions are determined at issuance, include a margin for adverse deviation and are locked in throughout the life of the contract unless a premium deficiency develops. If a premium deficiency emerges, the assumptions are unlocked and deferred acquisition costs, if any, and the future policy benefits reserves are adjusted. The December 31, 2015 gross premium valuation (GPV) indicated a premium deficiency of $296 million. The indicated premium deficiency necessitated a charge to income that was affected by the write off of the entire long term care deferred acquisition cost asset of $289 million and an increase to active life reserves of $7 million. As a result, the long term care active life reserves carried as of December 31, 2015 represent management’s best estimate assumptions at that date with no margin for adverse deviation. The December 31, 2016 GPV indicated the carried reserves were sufficient, therefore there was no unlocking of assumptions. Interest rates for long term care active life reserves range from 6.6% to 7.0% as of December 31, 2016 and 2015.

Guaranty fund and other insurance-related assessments: Liabilities for guaranty fund and other insurance-related assessments are accrued when an assessment is probable, when it can be reasonably estimated and when the event obligating the entity to pay an imposed or probable assessment has occurred. Liabilities for guaranty funds and other insurance-related assessments are not discounted and are included as part of Other liabilities on the Consolidated Balance Sheets. As of December 31, 2016 and 2015, the liability balances were $125 million and $129 million.

Reinsurance: Reinsurance accounting allows for contractual cash flows to be reflected as premiums and losses. To qualify for reinsurance accounting, reinsurance agreements must include risk transfer. To meet risk transfer requirements, a reinsurance contract must include both insurance risk, consisting of underwriting and timing risk, and a reasonable possibility of a significant loss for the assuming entity.

Reinsurance receivables related to paid losses are presented at unpaid balances. Reinsurance receivables related to unpaid losses are estimated in a manner consistent with claim and claim adjustment expense reserves or future policy benefits reserves. Reinsurance receivables are reported net of an allowance for uncollectible amounts on the Consolidated Balance Sheets. The cost of reinsurance is primarily accounted for over the life of the underlying reinsured policies using assumptions consistent with those used to account for the underlying policies or over the reinsurance contract period. The ceding of insurance does not discharge the primary liability of the Company.

The Company has established an allowance for uncollectible reinsurance receivables which relates to both amounts already billed on ceded paid losses as well as ceded reserves that will be billed when losses are paid in the future. The allowance for uncollectible reinsurance receivables is estimated on the basis of periodic evaluations of balances due from reinsurers, reinsurer solvency, management's experience and current economic conditions. Reinsurer financial strength ratings are updated and reviewed on an annual basis or sooner if the Company becomes aware of significant changes related to a reinsurer. Because billed receivables generally approximate 3% or less of total reinsurance receivables, the age of the reinsurance receivables related to paid losses is not a significant input into the allowance analysis. Changes in the allowance for uncollectible reinsurance receivables are presented as a component of Insurance claims and policyholders' benefits on the Consolidated Statements of Operations.

Amounts are considered past due based on the reinsurance contract terms. Reinsurance receivables related to paid losses and any related allowance are written off after collection efforts have been exhausted or a negotiated settlement is reached with the reinsurer. Reinsurance receivables related to paid losses from insolvent insurers are written off when the settlement due from the estate can be reasonably estimated. At the time reinsurance receivables related to paid losses are written off, any required adjustment to reinsurance receivables related to unpaid losses is recorded as a component of Insurance claims and policyholders' benefits on the Consolidated Statements of Operations.

Reinsurance contracts that do not effectively transfer the economic risk of loss on the underlying policies are recorded using the deposit method of accounting, which requires that premium paid or received by the ceding company or assuming company be accounted for as a deposit asset or liability. The Company had $3 million recorded as deposit assets as of December 31, 2016 and 2015, and $6 million and $8 million recorded as deposit liabilities as of December 31, 2016 and 2015. Income on reinsurance contracts accounted for under the deposit method is recognized using an effective yield based on the anticipated timing of payments and the remaining life of the contract. When the anticipated timing of payments changes, the effective yield is recalculated to reflect actual payments to date and the estimated timing of future payments. The deposit asset or liability is adjusted to the amount that would have existed had the new effective yield been applied since the inception of the contract.

A loss portfolio transfer is a retroactive reinsurance contract. If the cumulative claim and allocated claim adjustment expenses ceded under a loss portfolio transfer exceed the consideration paid, the resulting gain from such excess is deferred and amortized into earnings in future periods in proportion to actual recoveries under the loss portfolio transfer. In any period in which there is a gain position and a revised estimate of claim and allocated claim adjustment expenses, a portion of the deferred gain is cumulatively recognized in earnings as if the revised estimate was available at the inception date of the loss portfolio transfer.

Deferred acquisition costs: Deferrable acquisition costs include commissions, premium taxes and certain underwriting and policy issuance costs which are incremental direct costs of successful contract acquisitions. Acquisition costs related to property and casualty business are deferred and amortized ratably over the period the related premiums are earned. Deferred acquisition costs are presented net of ceding commissions and other ceded acquisition costs.

The Company evaluates deferred acquisition costs for recoverability. Anticipated investment income is considered in the determination of the recoverability of deferred acquisition costs. Adjustments, if necessary, are recorded in current period results of operations.

Deferred acquisition costs related to long term care contracts issued prior to January 1, 2004 include costs which vary with and are primarily related to the acquisition of business. As noted under Future policy benefits reserves, all of the long term care deferred acquisition costs of $289 million were written off as of December 31, 2015 in recognition of a premium deficiency.

Investments in life settlement contracts and related revenue recognition: Prior to 2002, the Company purchased investments in life settlement contracts. The Company obtained the ownership and beneficiary rights of an underlying life insurance policy through a life settlement contract with the owner of the life insurance contract.

The Company accounts for its investments in life settlement contracts using the fair value method. Under the fair value method, each life settlement contract is carried at its fair value at the end of each reporting period. The change in fair value estimated through the Company's internal valuation process, life insurance proceeds received and periodic maintenance costs, such as premiums, necessary to keep the underlying policy in force, are recorded in Other revenues on the Consolidated Statements of Operations.

In December 2016, the Company reached agreement on terms to sell the entire portfolio of life settlement contracts to a third party. The Company expects to consummate this transaction in 2017. As a result, the portfolio, which is included within Life & Group Non-Core segment, was determined to be held for sale as of December 31, 2016. Therefore, the contracts were measured at the lower of the carrying amount or the fair value per the agreed terms. This resulted in a $10 million loss recognized within Net realized investment gains. The fair value of the Company's investments in life settlement contracts were $58 million and $74 million as of December 31, 2016 and 2015, and are included in Other assets on the Consolidated Balance Sheets. The cash receipts and payments related to life settlement contracts are included in Cash flows from operating activities on the Consolidated Statements of Cash Flows.

The following table details the values for life settlement contracts. The determination of fair value is discussed in Note C to the Consolidated Financial Statements.

December 31, 2016	Number of Life Settlement Contracts	Fair Value of Life Settlement Contracts (In millions)		Face Amount of Life Insurance Policies (In millions)
Estimated settlements during:
2017	63	$	10	$	34
2018	55	8		30
2019	49	7		26
2020	43	6		23
2021	36	4		19
Thereafter	280	23		153
Total	526	$	58	$	285

The Company uses an actuarial model to estimate the aggregate face amount of life insurance that are expected to settle in each future year and the corresponding fair value. This model projects the likelihood of the insured's death for each inforce policy based upon the Company's estimated mortality rates, which may vary due to the relatively small size of the portfolio of life settlement contracts. The number of life settlement contracts presented in the table above is based upon the average face amount of inforce policies estimated to settle in each future year.

The increase in fair value recognized in Other revenues for the years ended December 31, 2016, 2015 and 2014 on contracts still held at each respective period-end was $7 million, $1 million and $8 million. The gains recognized during the years ended December 31, 2016, 2015 and 2014 on contracts that settled were $8 million, $24 million and $25 million.

Investments

The Company classifies its fixed maturity securities and its equity securities as either available-for-sale or trading, and as such, they are carried at fair value. Changes in fair value of trading securities are reported within Net investment income on the Consolidated Statements of Operations. Changes in fair value related to available-for-sale securities are reported as a component of Other comprehensive income. Losses may be recognized within Net realized investment gains (losses) on the Consolidated Statements of Operations when a decline in value is determined by the Company to be other-than-temporary.

The cost of fixed maturity securities classified as available-for-sale is adjusted for amortization of premiums and accretion of discounts, which are included in Net investment income on the Consolidated Statements of Operations. The amortization of premium and accretion of discount for fixed maturity securities takes into consideration call and maturity dates that produce the lowest yield. In 2015 the Company changed its accounting principle as previously the amortization of premiums was to maturity. This change in estimate effected by a change in accounting principle was adopted in the fourth quarter of 2015 and decreased Net investment income and the amortized cost of fixed maturity securities by $39 million in the Consolidated Statement of Operations for the year-ended December 31, 2015 and the Consolidated Balance Sheet as of December 31, 2015. The $39 million decrease to Net investment income included a $22 million cumulative adjustment relating to prior periods. The total adjustment decreased Basic and Diluted earnings per share by $0.09 for the year ended December 31, 2015.

To the extent that unrealized gains on fixed income securities supporting long term care products and structured settlements not funded by annuities would result in a premium deficiency if those gains were realized, a related increase in Insurance reserves is recorded, net of tax, as a reduction of net unrealized gains through Other comprehensive income (Shadow Adjustments). Shadow Adjustments, net of tax, decreased $97 million and $177 million for the years ended December 31, 2016 and 2015. As of December 31, 2016 and 2015, net unrealized gains on investments included in Accumulated other comprehensive income (AOCI) were correspondingly reduced by Shadow Adjustments of $1,014 million and $1,111 million.

For asset-backed securities included in fixed maturity securities, the Company recognizes income using an effective yield based on anticipated prepayments and the estimated economic life of the securities. When estimates of prepayments change, the effective yield is recalculated to reflect actual payments to date and anticipated future payments. The amortized cost of high credit quality fixed rate securities is adjusted to the amount that would have existed had the new effective yield been applied since the acquisition of the securities. Such adjustments are reflected in Net investment income on the Consolidated Statements of Operations. Interest income on lower rated and variable rate securities is determined using the prospective yield method.

The Company's carrying value of investments in limited partnerships is its share of the net asset value of each partnership, as determined by the general partner. Certain partnerships for which results are not available on a timely basis are reported on a lag, primarily three months or less. Changes in net asset values are accounted for under the equity method and recorded within Net investment income on the Consolidated Statements of Operations.

Mortgage loans are commercial in nature, are carried at unpaid principal balance, net of unamortized fees and any valuation allowance, and are recorded once funded. Mortgage loans are considered to be impaired loans when it is probable that contractual principal and interest payments will not be collected. A valuation allowance is established for impaired loans to the extent that the present value of expected future cash flows discounted at the loan's original effective interest rate is less than the carrying value of the loan. Interest income from mortgage loans is recognized on an accrual basis using the effective yield method. Accrual of income is generally suspended for mortgage loans that are impaired and collection of principal and interest payments is unlikely. Mortgage loans are considered past due when full principal or interest payments have not been received according to contractual terms.

Other invested assets include overseas deposits and Federal Home Loan Bank of Chicago (FHLBC) stock. FHLBC stock is carried at fair value. Overseas deposits are valued using the net asset value per share (or equivalent) practical expedient. They are primarily short-term government securities, agency securities and corporate bonds held in trusts that are managed by Lloyd's of London. These funds are required of Lloyd's syndicates to protect policyholders in overseas markets and may be denominated in local currency.

Short term investments are carried at fair value, with the exception of cash accounts earning interest, which are carried at cost and approximate fair value. Changes in fair value are reported as a component of Other comprehensive income.

Purchases and sales of all securities are recorded on the trade date, except for private placement debt securities, including bank loan participations, which are recorded once funded. Realized investment gains and losses are determined on the basis of the cost or amortized cost of the specific securities sold.

In the normal course of investing activities, the Company enters into relationships with variable interest entities (VIEs), as both an investor in limited partnerships and asset-backed securities issued by third-party VIEs. The Company is not the primary beneficiary of these VIEs, and therefore does not consolidate them. The Company determines whether it is the primary beneficiary of a VIE based on a qualitative assessment of the relative power and benefits of the Company and our venture partners. The Company’s maximum exposure to loss with respect to these investments is limited to the investment carrying values included in the Company’s Consolidated Balance Sheets and any unfunded commitments.

A security is impaired if the fair value of the security is less than its cost adjusted for accretion, amortization and previously recorded other-than-temporary impairment (OTTI) losses, otherwise defined as an unrealized loss. When a security is impaired, the impairment is evaluated to determine whether it is temporary or other-than-temporary.

Significant judgment is required in the determination of whether an OTTI loss has occurred for a security. The Company follows a consistent and systematic process for determining and recording an OTTI loss. The Company has established a committee responsible for the OTTI process referred to as the Impairment Committee. The Impairment Committee is responsible for evaluating all securities in an unrealized loss position on at least a quarterly basis.

The Impairment Committee’s assessment of whether an OTTI loss has occurred incorporates both quantitative and qualitative information. Fixed maturity securities that the Company intends to sell, or it more likely than not will be required to sell before recovery of amortized cost, are considered to be other-than-temporarily impaired and the entire difference between the amortized cost basis and fair value of the security is recognized as an OTTI loss in earnings. The remaining fixed maturity securities in an unrealized loss position are evaluated to determine if a credit loss exists. The factors considered by the Impairment Committee include (a) the financial condition and near-term and long-term prospects of the issuer, (b) whether the debtor is current on interest and principal payments, (c) credit ratings of the securities and (d) general market conditions and industry or sector specific outlook. The Company also considers results and analysis of cash flow modeling for asset-backed securities, and when appropriate, other fixed maturity securities. The focus of the analysis for asset-backed securities is on assessing the sufficiency and quality of underlying collateral and timing of cash flows based on scenario tests. If the present value of the modeled expected cash flows equals or exceeds the amortized cost of a security, no credit loss is judged to exist and the asset-backed security is deemed to be temporarily impaired. If the present value of the expected cash flows is significantly less than amortized cost, the security is judged to be other-than-temporarily impaired for credit reasons and that shortfall, referred to as the credit component, is recognized as an OTTI loss in earnings. The difference between the adjusted amortized cost basis and fair value, referred to as the non-credit component, is recognized as OTTI in Other comprehensive income. In subsequent reporting periods, a change in intent to sell or further credit impairment on a security whose fair value has not deteriorated will cause the non-credit component originally recorded as OTTI in Other comprehensive income to be recognized as an OTTI loss in earnings. The Company performs the discounted cash flow analysis using stressed scenarios to determine future expectations regarding recoverability. Significant assumptions enter into these cash flow projections including delinquency rates, probable risk of default, loss severity upon a default, over collateralization and interest coverage triggers and credit support from lower level tranches.

The Company applies the same impairment model as described above for the majority of its non-redeemable preferred stock securities on the basis that these securities possess characteristics similar to debt securities and that the issuers maintain their ability to pay dividends. For all other equity securities, in determining whether the security is other-than-temporarily impaired, the Impairment Committee considers a number of factors including, but not limited to: (a) the length of time and the extent to which the fair value has been less than amortized cost, (b) the financial condition and near term prospects of the issuer, (c) the intent and ability of the Company to retain its investment for a period of time sufficient to allow for an anticipated recovery in value and (d) general market conditions and industry or sector specific outlook.

Income Taxes

The Company and its eligible subsidiaries (CNA Tax Group) are included in the consolidated federal income tax return of Loews and its eligible subsidiaries. The Company accounts for income taxes under the asset and liability method. Under the asset and liability method, deferred income taxes are recognized for temporary differences between the financial statement and tax return bases of assets and liabilities, based on enacted tax rates and other provisions of the tax law. The effect of a change in tax laws or rates on deferred tax assets and liabilities is recognized in income in the period in which such change is enacted. Future tax benefits are recognized to the extent that realization of such benefits is more likely than not, and a valuation allowance is established for any portion of a deferred tax asset that management believes will not be realized.

Pension and Postretirement Benefits

The Company recognizes the overfunded or underfunded status of its defined benefit plans in Other assets or Other liabilities on the Consolidated Balance Sheets. Changes in funded status related to prior service costs and credits and actuarial gains and losses are recognized in the year in which the changes occur through Other comprehensive income. Annual service cost, interest cost, expected return on plan assets, amortization of prior service costs and credits and amortization of actuarial gains and losses are recognized in the Consolidated Statements of Operations. The vested benefit obligation for the CNA Retirement Plan is determined based on eligible compensation and accrued service for previously entitled employees. Effective June 30, 2015, future benefit accruals under the CNA Retirement Plan were eliminated and the benefit obligations were frozen.

Stock-Based Compensation

The Company records compensation expense using the fair value method for all awards it grants, modifies or cancels primarily on a straight-line basis over the requisite service period, generally three to four years.

Foreign Currency

Foreign currency translation gains and losses are reflected in Stockholders' equity as a component of AOCI. The Company's foreign subsidiaries' balance sheet accounts are translated at the exchange rates in effect at each reporting date and income statement accounts are either translated at the exchange rate on the date of the transaction or at the average exchange rates. Foreign currency transaction gains (losses) of $(9) million, $(11) million and $(25) million were included in determining Net income (loss) for the years ended December 31, 2016, 2015 and 2014.

Property and Equipment

Property and equipment are carried at cost less accumulated depreciation. Depreciation is based on the estimated useful lives of the various classes of property and equipment and is determined principally on the straight-line method. Furniture and fixtures are depreciated over seven years. Office equipment is depreciated over five years. The estimated lives for data processing equipment and software generally range from three to five years, but can be as long as ten years. Leasehold improvements are depreciated over the corresponding lease terms not to exceed the underlying asset life. The Company's previously owned building and related capital improvements were depreciated over periods not to exceed fifty years.

Goodwill

Goodwill represents the excess of purchase price over the fair value of the net assets of acquired entities and businesses. Goodwill in the International segment may change from period to period as a result of foreign currency translation.

Goodwill is tested for impairment annually or when certain triggering events require such tests. As a result of reviews completed for the year ended December 31, 2016, the Company determined that the estimated fair value of the reporting units were in excess of their carrying value including Goodwill. Changes in future periods in assumptions about the level of economic capital, business growth, earnings projections or the weighted average cost of capital could result in a goodwill impairment.

Other Intangible Assets

Other intangible assets are reported within Other assets.Finite-lived intangible assets are amortized over their estimated useful lives. Indefinite-lived other intangible assets are tested for impairment annually or when certain triggering events require such tests.

Earnings (Loss) Per Share Data

Earnings (loss) per share is based on weighted average number of outstanding common shares. Basic earnings (loss) per share excludes the impact of dilutive securities and is computed by dividing Net income (loss) by the weighted average number of common shares outstanding for the period. Diluted earnings (loss) per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock.

For the years ended December 31, 2016, 2015 and 2014, approximately 678 thousand, 534 thousand and 675 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were included in the calculation of diluted earnings per share. For those same periods, approximately 102 thousand, 106 thousand and 170 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were not included in the calculation of diluted earnings per share because the effect would have been antidilutive.

Supplementary Cash Flow Information

Cash payments made for interest were $157 million, $152 million and $179 million for the years ended December 31, 2016, 2015 and 2014. Cash payments made for income taxes were $170 million, $310 million and $313 million for the years ended December 31, 2016, 2015 and 2014.

Recently Adopted Accounting Standards Updates (ASU)

In April 2015, the Financial Accounting Standards Board (FASB) issued ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The updated accounting guidance requires debt issuance costs to be presented as a deduction from the corresponding debt liability instead of the historical presentation as an unamortized debt issuance asset. As of January 1, 2016, the Company adopted the updated accounting guidance retrospectively. The Company adjusted its previously reported financial information included herein to reflect the change in accounting guidance for debt issuance costs. The impacts of adopting the new accounting standard on the Company’s Consolidated Balance Sheet as of December 31, 2015, were a decrease in Other assets and a decrease in Long term debt of $2 million.

In May 2015, the FASB issued ASU No. 2015-09, Financial Services-Insurance (Topic 944): Disclosures about Short-Duration Contracts. The updated accounting guidance requires enhanced disclosures to provide additional information about insurance liabilities for short-duration contracts. The updated guidance is effective for annual financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within the annual periods beginning after December 15, 2016. The Company has adopted the change in disclosure requirements for short-duration contracts.

In May 2015, the FASB issued ASU No. 2015-07, Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent). The updated accounting guidance removes the requirement to categorize assets measured at fair value utilizing the net asset value per share (or equivalent) practical expedient within the fair value hierarchy. As of January 1, 2016, the Company adopted the updated accounting guidance retrospectively. The Company adjusted its previously reported financial information included herein to reflect the change in accounting guidance for assets measured using the net asset value. The impact of adopting the new accounting standard resulted in excluding overseas deposits of $31 million and $27 million and limited partnership investments held within the pension plan of $876 million and $935 million from the fair value level disclosures as of December 31, 2016 and December 31, 2015.

Accounting Standards Pending Adoption

In May 2014, the FASB issued ASU No. 2014-09, Revenue Recognition (Topic 606): Revenue from Contracts with Customers. The standard excludes from its scope the accounting for insurance contracts, financial instruments, and certain other agreements that are governed under other GAAP guidance. The updated guidance requires an entity to recognize revenue as performance obligations are met, in an amount that reflects the consideration the entity is entitled to receive for the transfer of the promised goods or services. The standard is effective for interim and annual reporting periods beginning after December 15, 2017 and may be applied retrospectively or through a cumulative effect adjustment to retained earnings at the date of adoption. The Company has not made a decision on the method of adoption and is currently evaluating the effect the updated guidance will have on the Company’s financial statements.  While the Company anticipates some changes to revenue recognition for certain of our warranty products and services, we do not currently believe ASU 2014-09 will have a material effect on our Consolidated Financial Statements.

In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The updated accounting guidance requires changes to the reporting model for financial instruments. The guidance is effective for interim and annual periods beginning after December 15, 2017. The Company is currently evaluating the effect the guidance will have on the Company's financial statements, and expects the primary change for the Company to be the requirement for equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842): Accounting for Leases. The updated accounting guidance requires lessees to recognize on the balance sheet the assets and liabilities for the rights and obligations created by all leases, including those historically accounted for as operating leases. The guidance is effective for interim and annual periods beginning after December 15, 2018. The Company is currently evaluating the effect the updated guidance will have on the Company's financial statements. It is expected that assets and liabilities will increase based on the present value of remaining lease payments for leases in place at the adoption date; however, this is not expected to be material to the Company's results of operations or financial position.

In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvementsto Employee Share-Based Payment Accounting. The updated accounting guidance simplifies the accounting for share-based payment award transactions, including income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance is effective for annual and interim periods beginning after December 15, 2016. The Company is currently evaluating the effect the updated guidance will have on the Company’s financial statements, but anticipates the primary change to be the recognition of excess tax benefits or deficiencies on vesting or settlement of awards as an income tax benefit or expense within net income and the related cash flows classified within operating activities.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurementof Credit Losses on Financial Instruments. The updated accounting guidance requires changes to the recognition of credit losses on financial instruments not accounted for at fair value through net income. The guidance is effective for interim and annual periods beginning after December 15, 2019. The Company is currently evaluating the effect the guidance will have on the Company's financial statements, but expects the primary changes to be the use of the expected credit loss model for its mortgage loan portfolio and reinsurance receivables and the presentation of credit losses within the available-for-sale fixed maturities portfolio through an allowance method rather than as a direct write-down. The expected credit loss model will require a financial asset to be presented at the net amount expected to be collected. The allowance method for available-for-sale debt securities will allow the Company to record reversals of credit losses if the estimate of credit losses declines.

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Investments

12 Months Ended

Dec. 31, 2016

Investments [Abstract]

Investments

Note B. Investments

The significant components of Net investment income are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Fixed maturity securities	$	1,819		$	1,751		$	1,803
Equity securities	10			12			12
Limited partnership investments	155			92			263
Mortgage loans	41			33			31
Short term investments	8			6			3
Trading portfolio	10			8			10
Other	4			1			3
Gross investment income	2,047			1,903			2,125
Investment expense	(59		)	(63		)	(58		)
Net investment income	$	1,988		$	1,840		$	2,067

As of December 31, 2016, the Company held no non-income producing fixed maturity securities. As of December 31, 2015, the Company held $54 million of non-income producing fixed maturity securities. As of December 31, 2016 and 2015, no investments in a single issuer exceeded 10% of stockholders' equity, other than investments in securities issued by the U.S. Treasury and obligations of government-sponsored enterprises.

Net realized investment gains (losses) are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Net realized investment gains (losses):
Fixed maturity securities:
Gross realized gains	$	204		$	131		$	170
Gross realized losses	(138		)	(197		)	(129		)
Net realized investment gains (losses) on fixed maturity securities	66			(66		)	41
Equity securities:
Gross realized gains	5			2			8
Gross realized losses	(10		)	(25		)	(7		)
Net realized investment gains (losses) on equity securities	(5		)	(23		)	1
Derivatives	(2		)	10			(1		)
Short term investments and other	(9		)	12			16
Net realized investment gains (losses)	$	50		$	(67	)	$	57

Net change in unrealized gains on investments is presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Net change in unrealized gains on investments:
Fixed maturity securities	$	225		$	(1,114	)	$	1,511
Equity securities	(2		)	(6		)	6
Other	1			1			—
Total net change in unrealized gains on investments	$	224		$	(1,119	)	$	1,517

The components of OTTI losses recognized in earnings by asset type are presented in the following table.

Years ended December 31
(In millions)	2016		2015		2014
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	59	$	104	$	18
States, municipalities and political subdivisions	—		18		46
Asset-backed:
Residential mortgage-backed	10		8		5
Other asset-backed	3		1		1
Total asset-backed	13		9		6
Total fixed maturity securities available-for-sale	72		131		70
Equity securities available-for-sale -- Common stock	9		25		7
OTTI losses recognized in earnings	$	81	$	156	$	77

The following tables present a summary of fixed maturity and equity securities.

December 31, 2016	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,711	$	1,323	$	76	$	18,958	$	(1	)
States, municipalities and political subdivisions	12,060		1,213		33		13,240		(16		)
Asset-backed:
Residential mortgage-backed	5,004		120		51		5,073		(28		)
Commercial mortgage-backed	2,016		48		24		2,040		—
Other asset-backed	1,022		8		5		1,025		—
Total asset-backed	8,042		176		80		8,138		(28		)
U.S. Treasury and obligations of government-sponsored enterprises	83		10		—		93		—
Foreign government	435		13		3		445		—
Redeemable preferred stock	18		1		—		19		—
Total fixed maturity securities available-for-sale	38,349		2,736		192		40,893		$	(45	)
Total fixed maturity securities trading	12						12
Equity securities available-for-sale:
Common stock	13		6		—		19
Preferred stock	93		2		4		91
Total equity securities available-for-sale	106		8		4		110
Total	$	38,467	$	2,744	$	196	$	41,015

December 31, 2015	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,080	$	1,019	$	342	$	17,757	$	—
States, municipalities and political subdivisions	11,729		1,453		8		13,174		(4		)
Asset-backed:
Residential mortgage-backed	4,935		154		17		5,072		(37		)
Commercial mortgage-backed	2,154		55		12		2,197		—
Other asset-backed	923		6		8		921		—
Total asset-backed	8,012		215		37		8,190		(37		)
U.S. Treasury and obligations of government-sponsored enterprises	62		5		—		67		—
Foreign government	334		13		1		346		—
Redeemable preferred stock	33		2		—		35		—
Total fixed maturity securities available-for-sale	37,250		2,707		388		39,569		$	(41	)
Total fixed maturity securities trading	3						3
Equity securities available-for-sale:
Common stock	46		3		1		48
Preferred stock	145		7		3		149
Total equity securities available-for-sale	191		10		4		197
Total	$	37,444	$	2,717	$	392	$	39,769

The following tables present the estimated fair value and gross unrealized losses of fixed maturity and equity securities in a gross unrealized loss position by the length of time in which the securities have continuously been in that position.

	Less than 12 Months				12 Months or Longer				Total
December 31, 2016	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	2,615	$	61	$	254	$	15	$	2,869	$	76
States, municipalities and political subdivisions	959		32		23		1		982		33
Asset-backed:
Residential mortgage-backed	2,136		44		201		7		2,337		51
Commercial mortgage-backed	756		22		69		2		825		24
Other asset-backed	398		5		24		—		422		5
Total asset-backed	3,290		71		294		9		3,584		80
U.S. Treasury and obligations of government-sponsored enterprises	5		—		—		—		5		—
Foreign government	108		3		—		—		108		3
Redeemable preferred stock	—		—		—		—		—		—
Total fixed maturity securities available-for-sale	6,977		167		571		25		7,548		192
Equity securities available-for-sale -- Preferred stock	12		—		13		4		25		4
Total	$	6,989	$	167	$	584	$	29	$	7,573	$	196

	Less than 12 Months				12 Months or Longer				Total
December 31, 2015	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	4,882	$	302	$	162	$	40	$	5,044	$	342
States, municipalities and political subdivisions	338		8		75		—		413		8
Asset-backed:
Residential mortgage-backed	963		9		164		8		1,127		17
Commercial mortgage-backed	652		10		96		2		748		12
Other asset-backed	552		8		5		—		557		8
Total asset-backed	2,167		27		265		10		2,432		37
U.S. Treasury and obligations of government-sponsored enterprises	4		—		—		—		4		—
Foreign government	54		1		—		—		54		1
Redeemable preferred stock	3		—		—		—		3		—
Total fixed maturity securities available-for-sale	7,448		338		502		50		7,950		388
Equity securities available-for-sale:
Common Stock	3		1		—		—		3		1
Preferred stock	13		3		—		—		13		3
Total equity securities available-for-sale	16		4		—		—		16		4
Total	$	7,464	$	342	$	502	$	50	$	7,966	$	392

Based on current facts and circumstances, the Company believes the unrealized losses presented in the December 31, 2016 securities in a gross unrealized loss position table above are not indicative of the ultimate collectibility of the current amortized cost of the securities, but rather are attributable to changes in interest rates, credit spreads and other factors. The Company has no current intent to sell securities with unrealized losses, nor is it more likely than not that it will be required to sell prior to recovery of amortized cost; accordingly, the Company has determined that there are no additional OTTI losses to be recorded as of December 31, 2016.

The following table presents the activity related to the pretax credit loss component reflected in Retained earnings on fixed maturity securities still held as of December 31, 2016, 2015 and 2014 for which a portion of an OTTI loss was recognized in Other comprehensive income (loss).

Years ended December 31
(In millions)	2016			2015			2014
Beginning balance of credit losses on fixed maturity securities	$	53		$	62		$	74
Reductions for securities sold during the period	(16		)	(9		)	(9		)
Reductions for securities the Company intends to sell or more likely than not will be required to sell	(1		)	—			(3		)
Ending balance of credit losses on fixed maturity securities	$	36		$	53		$	62

Contractual Maturity

The following table presents available-for-sale fixed maturity securities by contractual maturity.

December 31	2016				2015
(In millions)	Cost or Amortized Cost		Estimated Fair Value		Cost or Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,779	$	1,828	$	1,574	$	1,595
Due after one year through five years	7,566		7,955		7,721		8,070
Due after five years through ten years	15,892		16,332		14,652		14,915
Due after ten years	13,112		14,778		13,303		14,989
Total	$	38,349	$	40,893	$	37,250	$	39,569

Actual maturities may differ from contractual maturities because certain securities may be called or prepaid. Securities not due at a single date are allocated based on weighted average life.

Limited Partnerships

The carrying value of limited partnerships as of December 31, 2016 and 2015 was $2,371 million and $2,548 million, which includes undistributed earnings of $523 million and $687 million. Limited partnerships comprising 60% of the total carrying value are reported on a current basis through December 31, 2016 with no reporting lag, 18% are reported on a one month lag and the remainder are reported on more than a one month lag. The number of limited partnerships held and the strategies employed provide diversification to the limited partnership portfolio and the overall invested asset portfolio.

Limited partnerships comprising 68% and 70% of the carrying value as of December 31, 2016 and 2015 employ hedge fund strategies. Limited partnerships comprising 27% and 26% of the carrying value as of December 31, 2016 and 2015 were invested in private debt and equity and the remainder were primarily invested in real estate strategies. Hedge fund strategies include both long and short positions in fixed income, equity and derivative instruments. These hedge fund strategies may seek to generate gains from mispriced or undervalued securities, price differentials between securities, distressed investments, sector rotation or various arbitrage disciplines. Within hedge fund strategies, approximately 55% were equity related, 26% pursued a multi-strategy approach, 17% were focused on distressed investments and 2% were fixed income related as of December 31, 2016.

The ten largest limited partnership positions held totaled $1,168 million and $1,221 million as of December 31, 2016 and 2015. Based on the most recent information available regarding the Company’s percentage ownership of the individual limited partnerships, the carrying value reflected on the Consolidated Balance Sheets represents approximately 4% and 3% of the aggregate partnership equity as of December 31, 2016 and 2015, and the related income reflected on the Consolidated Statements of Operations represents approximately 4%, 3% and 4% of the changes in aggregate partnership equity for the years ended December 31, 2016, 2015 and 2014.

While the Company generally does not invest in highly leveraged partnerships, there are risks inherent in limited partnership investments which may result in losses due to short-selling, derivatives or other speculative investment practices. The use of leverage increases volatility generated by the underlying investment strategies.

The Company’s limited partnership investments contain withdrawal provisions that generally limit liquidity for a period of thirty days up to one year and in some cases do not permit withdrawals until the termination of the partnership. Typically, withdrawals require advance written notice of up to 90 days.

Derivative Financial Instruments

The Company may use derivatives in the normal course of business, primarily in an attempt to reduce its exposure to market risk (principally interest rate risk, credit risk, equity price risk and foreign currency risk) stemming from various assets and liabilities. The Company's principal objective under such strategies is to achieve the desired reduction in economic risk, even if the position does not receive hedge accounting treatment.

The Company may enter into interest rate swaps, futures and forward commitments to purchase securities to manage interest rate risk. The Company may use foreign currency forward contracts to manage foreign currency risk.

Credit exposure associated with non-performance by the counterparties to derivative instruments is generally limited to the uncollateralized fair value of the asset related to the instruments recognized on the Consolidated Balance Sheets. The Company generally requires that all over-the-counter derivative contracts be governed by an International Swaps and Derivatives Association Master Agreement, and exchanges collateral under the terms of these agreements with its derivative investment counterparties depending on the amount of the exposure and the credit rating of the counterparty. Gross estimated fair values of derivative positions are presented in Other invested assets and Other liabilities on the Consolidated Balance Sheet. The Company does not offset derivative positions against the fair value of collateral provided or positions subject to netting arrangements. There would be no significant difference in the balance included in such accounts if the estimated fair values were presented net for the periods ended December 31, 2016 and 2015.

There was no cash collateral provided by the Company as of December 31, 2016 or 2015. There was no cash collateral received from counterparties held as of December 31, 2016 or 2015.

The Company holds an embedded derivative on funds withheld liability with a notional value of $174 million and $179 million as of December 31, 2016 and 2015 and a fair value of $3 million and $5 million as of December 31, 2016 and 2015. The embedded derivative on funds withheld liability is accounted for separately and reported with the funds withheld liability in Other liabilities on the Consolidated Balance Sheets.

Commercial Mortgage Loans

Risks related to the recoverability of loan balances include declines in the estimated cash flows from underlying property leases, fair value of collateral and creditworthiness of tenants of credit tenant loan properties, where lease payments directly service the loan. The Company evaluates loans for impairment on a specific loan basis and identifies loans for evaluation of impairment based on the collection experience of each loan and other credit quality indicators such as debt service coverage ratio and the creditworthiness of the borrower or tenants of credit tenant loan properties. As of December 31, 2016 and 2015, there were no loans past due or in non-accrual status, and no valuation allowance was recorded.

Investment Commitments

As of December 31, 2016, the Company had committed approximately $380 million to future capital calls from various third-party limited partnership investments in exchange for an ownership interest in the related partnerships.

As of December 31, 2016, the Company had mortgage loan commitments of $20 million representing signed loan applications received and accepted.

The Company invests in various privately placed debt securities, including bank loans, as part of its overall investment strategy and has committed to additional future purchases, sales and funding. Purchases and sales of privately placed debt securities are recorded once funded. As of December 31, 2016, the Company had commitments to purchase or fund additional amounts of $130 million and sell $121 million under the terms of such securities.

Investments on Deposit

Securities with carrying values of approximately $2.3 billion and $2.8 billion were deposited by the Company’s insurance subsidiaries under requirements of regulatory authorities and others as of December 31, 2016 and 2015.

Cash and securities with carrying values of approximately $514 million and $364 million were deposited with financial institutions as collateral for letters of credit as of December 31, 2016 and 2015. In addition, cash and securities were deposited in trusts with financial institutions to secure reinsurance and other obligations with various third parties. The carrying values of these deposits were approximately $261 million and $263 million as of December 31, 2016 and 2015.

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Fair Value

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value

Note C. Fair Value

Fair value is the price that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The following fair value hierarchy is used in selecting inputs, with the highest priority given to Level 1, as these are the most transparent or reliable.

Level 1 - Quoted prices for identical instruments in active markets.

Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets.

Level 3 - Valuations derived from valuation techniques in which one or more significant inputs are not observable.

Prices may fall within Level 1, 2 or 3 depending upon the methodology and inputs used to estimate fair value for each specific security. In general the Company seeks to price securities using third-party pricing services. Securities not priced by pricing services are submitted to independent brokers for valuation and, if those are not available, internally developed pricing models are used to value assets using a methodology and inputs the Company believes market participants would use to value the assets. Prices obtained from third-party pricing services or brokers are not adjusted by the Company.

The Company performs control procedures over information obtained from pricing services and brokers to ensure prices received represent a reasonable estimate of fair value and to confirm representations regarding whether inputs are observable or unobservable. Procedures may include i) the review of pricing service methodologies or broker pricing qualifications, ii) back-testing, where past fair value estimates are compared to actual transactions executed in the market on similar dates, iii) exception reporting, where period-over-period changes in price are reviewed and challenged with the pricing service or broker based on exception criteria, iv) deep dives, where the Company performs an independent analysis of the inputs and assumptions used to price individual securities and v) pricing validation, where prices received are compared to prices independently estimated by the Company.

Assets and Liabilities Measured at Fair Value

Assets and liabilities measured at fair value on a recurring basis are presented in the following tables.

December 31, 2016								Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2			Level 3
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	18,840		$	130	$	18,970
States, municipalities and political subdivisions	—		13,239			1		13,240
Asset-backed:
Residential mortgage-backed	—		4,944			129		5,073
Commercial mortgage-backed	—		2,027			13		2,040
Other asset-backed	—		968			57		1,025
Total asset-backed	—		7,939			199		8,138
U.S. Treasury and obligations of government-sponsored enterprises	93		—			—		93
Foreign government	—		445			—		445
Redeemable preferred stock	19		—			—		19
Total fixed maturity securities	112		40,463			330		40,905
Equity securities	91		—			19		110
Other invested assets	—		5			—		5
Short term investments	475		853			—		1,328
Life settlement contracts, included in Other assets	—		—			58		58
Total assets	$	678	$	41,321		$	407	$	42,406
Liabilities
Other liabilities	$	—	$	(3	)	$	—	$	(3	)
Total liabilities	$	—	$	(3	)	$	—	$	(3	)

December 31, 2015								Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2			Level 3
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	17,592		$	168	$	17,760
States, municipalities and political subdivisions	—		13,172			2		13,174
Asset-backed:
Residential mortgage-backed	—		4,938			134		5,072
Commercial mortgage-backed	—		2,175			22		2,197
Other asset-backed	—		868			53		921
Total asset-backed	—		7,981			209		8,190
U.S. Treasury and obligations of government-sponsored enterprises	66		1			—		67
Foreign government	—		346			—		346
Redeemable preferred stock	35		—			—		35
Total fixed maturity securities	101		39,092			379		39,572
Equity securities	177		—			20		197
Other invested assets	—		17			—		17
Short term investments	448		1,134			—		1,582
Life settlement contracts, included in Other assets	—		—			74		74
Total assets	$	726	$	40,243		$	473	$	41,442
Liabilities
Other liabilities	$	—	$	(5	)	$	—	$	(5	)
Total liabilities	$	—	$	(5	)	$	—	$	(5	)

The tables below present a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

Level 3 (In millions)	Balance as of January 1, 2016		Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)*			Net change in unrealized appreciation (depreciation) included in Other comprehensive income (loss)			Purchases		Sales			Settlements			Transfers into Level 3		Transfers out of Level 3			Balance as of December 31, 2016		Unrealized gains (losses) on Level 3 assets and liabilities held as of December 31, 2016 recognized in Net income (loss)*
Fixed maturity securities:
Corporate and other bonds	$	168	$	1		$	1		$	163	$	(36	)	$	(103	)	$	—	$	(64	)	$	130	$	—
States, municipalities and political subdivisions	2		—			—			—		—			(1		)	—		—			1		—
Asset-backed:
Residential mortgage-backed	134		3			(5		)	15		—			(14		)	56		(60		)	129		—
Commercial mortgage-backed	22		(1		)	(1		)	32		—			(17		)	3		(25		)	13		—
Other asset-backed	53		(2		)	1			86		(25		)	(1		)	2		(57		)	57		—
Total asset-backed	209		—			(5		)	133		(25		)	(32		)	61		(142		)	199		—
Total fixed maturity securities	379		1			(4		)	296		(61		)	(136		)	61		(206		)	330		—
Equity securities	20		(1		)	—			—		—			—			—		—			19		(2		)
Life settlement contracts	74		5			—			—		—			(21		)	—		—			58		(3		)
Total	$	473	$	5		$	(4	)	$	296	$	(61	)	$	(157	)	$	61	$	(206	)	$	407	$	(5	)

Level 3 (In millions)	Balance as of January 1, 2015		Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)*			Net change in unrealized appreciation (depreciation) included in Other comprehensive income (loss)			Purchases		Sales			Settlements			Transfers into Level 3		Transfers out of Level 3			Balance as of December 31, 2015		Unrealized gains (losses) on Level 3 assets and liabilities held as of December 31, 2015 recognized in Net income (loss)*
Fixed maturity securities:
Corporate and other bonds	$	162	$	(2	)	$	(3	)	$	65	$	(13	)	$	(35	)	$	40	$	(46	)	$	168	$	(2	)
States, municipalities and political subdivisions	94		1			—			—		—			(10		)	—		(83		)	2		—
Asset-backed:
Residential mortgage-backed	189		5			(3		)	81		—			(35		)	14		(117		)	134		—
Commercial mortgage-backed	83		7			(4		)	23		—			(17		)	17		(87		)	22		—
Other asset-backed	655		3			3			130		(263		)	(52		)	7		(430		)	53		—
Total asset-backed	927		15			(4		)	234		(263		)	(104		)	38		(634		)	209		—
Total fixed maturity securities	1,183		14			(7		)	299		(276		)	(149		)	78		(763		)	379		(2		)
Equity securities	16		—			(1		)	4		—			—			1		—			20		—
Life settlement contracts	82		25			—			—		—			(33		)	—		—			74		1
Total	$	1,281	$	39		$	(8	)	$	303	$	(276	)	$	(182	)	$	79	$	(763	)	$	473	$	(1	)

Major Category of Assets and Liabilities	Consolidated Statements of Operations Line Items
Fixed maturity securities available-for-sale (1)	Net realized investment gains (losses)
Fixed maturity securities trading	Net investment income
Equity securities (1)	Net realized investment gains (losses)
Other invested assets - Derivative financial instruments held in a trading portfolio	Net investment income
Other invested assets - Derivative financial instruments not held in a trading portfolio	Net realized investment gains (losses)
Life settlement contracts	Other revenues
Other liabilities - Derivative financial instruments	Net realized investment gains (losses)

(1) Unrealized gains and losses are reported within AOCI.

Securities shown on the previous page may be transferred in or out of levels within the fair value hierarchy based on the availability of observable market information and quoted prices used to determine the fair value of the security. The availability of observable market information and quoted prices varies based on market conditions and trading volume. During the year ended December 31, 2016 there were no transfers between Level 1 and Level 2. There were $63 million of transfers from Level 2 to Level 1 and $52 million from Level 1 to Level 2 during the year ended December 31, 2015. The Company's policy is to recognize transfers between levels at the beginning of quarterly reporting periods.

Valuation Methodologies and Inputs

The following section describes the valuation methodologies and relevant inputs used to measure different financial instruments at fair value, including an indication of the level in the fair value hierarchy in which the instruments are generally classified.

Fixed Maturity Securities

Level 1 securities include highly liquid and exchange traded bonds and redeemable preferred stock, valued using quoted market prices. Level 2 securities include most other fixed maturity securities as the significant inputs are observable in the marketplace. All classes of Level 2 fixed maturity securities are valued using a methodology based on information generated by market transactions involving identical or comparable assets, a discounted cash flow methodology, or a combination of both when necessary. Common inputs for all classes of fixed maturity securities include prices from recently executed transactions of similar securities, marketplace quotes, benchmark yields, spreads off benchmark yields, interest rates and U.S. Treasury or swap curves. Specifically for asset-backed securities, key inputs include prepayment and default projections based on past performance of the underlying collateral and current market data. Fixed maturity securities are primarily assigned to Level 3 in cases where broker/dealer quotes are significant inputs to the valuation and there is a lack of transparency as to whether these quotes are based on information that is observable in the marketplace. Level 3 securities also include private placement debt securities whose fair value is determined using internal models with inputs that are not market observable.

Equity Securities

Level 1 equity securities include publicly traded securities valued using quoted market prices. Level 2 securities are primarily non-redeemable preferred stocks and common stocks valued using pricing for similar securities, recently executed transactions and other pricing models utilizing market observable inputs. Level 3 securities are primarily priced using broker/dealer quotes and internal models with inputs that are not market observable.

Other Invested Assets

The fair value of Federal Home Loan Bank of Chicago (FHLBC) stock is equal to par because it can only be redeemed by the FHLBC at par or sold to another member of the FHLBC at par and is classified as Level 2.

As of December 31, 2016 and December 31, 2015, there were approximately $31 million and $27 million respectively of overseas deposits within other invested assets, which can be redeemed at net asset value in 90 days or less. Overseas deposits are excluded from the fair value hierarchy because their fair value is recorded using the net asset value per share (or equivalent) practical expedient.

Short Term Investments

Securities that are actively traded or have quoted prices are classified as Level 1. These securities include money market funds and treasury bills. Level 2 primarily includes commercial paper, for which all inputs are market observable. Fixed maturity securities purchased within one year of maturity are classified consistent with fixed maturity securities discussed above. Short term investments as presented in the tables above differ from the amounts presented on the Consolidated Balance Sheets because certain short term investments, such as time deposits, are not measured at fair value.

Life Settlement Contracts

Historically, the fair values of life settlement contracts were determined as the present value of the anticipated death benefits less anticipated premium payments based on contract terms that are distinct for each insured, as well as the Company's own assumptions for mortality, premium expense and the rate of return that a buyer would require on the contracts. As discussed in Note A, Summary of Significant Accounting Policies, because the Company has reached agreement on terms to sell the portfolio of life settlement contracts to a third party, the fair value was written down to reflect the value determined per the agreed terms of sale. Despite the pending sale, as there is not an active market for life settlement contracts, they have been classified as Level 3.

Derivative Financial Investments

Level 2 securities primarily include the embedded derivative on funds withheld liability. The embedded derivative on funds withheld liability is valued using the change in fair value of the assets supporting the funds withheld liability, which are fixed maturity securities valued with observable inputs.

Significant Unobservable Inputs

The following tables present quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurements of Level 3 assets. Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company. The valuation of life settlement contracts as of December 31, 2016 was based on the terms of the pending sale of the contracts to a third party, therefore the contracts are not included in the table below.

December 31, 2016	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	106	Discounted cash flow	Credit spread	2% - 40% (4%)

December 31, 2015	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	138	Discounted cash flow	Credit spread	3% - 184% (6%)
Life settlement contracts	74		Discounted cash flow	Discount rate risk premium	9%
				Mortality assumption	55% - 1676% (164%)

For fixed maturity securities, an increase to the credit spread assumptions would result in a lower fair value measurement. For life settlement contracts, an increase in the discount rate risk premium or decrease in the mortality assumption would result in a lower fair value measurement.

Financial Assets and Liabilities Not Measured at Fair Value

The carrying amount and estimated fair value of the Company's financial assets and liabilities which are not measured at fair value on the Consolidated Balance Sheets are presented in the following tables.

December 31, 2016	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	591	$	—	$	—	$	594	$	594
Liabilities
Long term debt	$	2,710	$	—	$	2,952	$	—	$	2,952

December 31, 2015	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	678	$	—	$	—	$	688	$	688
Liabilities
Short term debt	$	350	$	—	$	360	$	—	$	360
Long term debt	2,210		—		2,433		—		2,433

The following methods and assumptions were used to estimate the fair value of these financial assets and liabilities.

The fair values of mortgage loans were based on the present value of the expected future cash flows discounted at the current interest rate for origination of similar quality loans, adjusted for specific loan risk.

The Company's senior notes and debentures were valued based on observable market prices. The fair value for other debt was estimated using discounted cash flows based on current incremental borrowing rates for similar borrowing arrangements.

The carrying amounts reported on the Consolidated Balance Sheets for Cash, Short term investments not carried at fair value, Accrued investment income and certain Other assets and Other liabilities approximate fair value due to the short term nature of these items. These assets and liabilities are not listed in the tables above.

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Income Taxes

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Income Taxes

Note D. Income Taxes

The CNA Tax Group is included in the consolidated federal income tax return of Loews and its eligible subsidiaries. Loews and the Company have agreed that for each taxable year, the Company will 1) be paid by Loews the amount, if any, by which the Loews consolidated federal income tax liability is reduced by virtue of the inclusion of the CNA Tax Group in the Loews consolidated federal income tax return, or 2) pay to Loews an amount, if any, equal to the federal income tax that would have been payable by the CNA Tax Group filing a separate consolidated tax return. In the event that Loews should have a net operating loss in the future computed on the basis of filing a separate consolidated tax return without the CNA Tax Group, the Company may be required to repay tax recoveries previously received from Loews. This agreement may be canceled by either party upon 30 days written notice.

For the years ended December 31, 2016, 2015 and 2014, the Company paid $142 million, $256 million and $287 million to Loews related to federal income taxes.

For 2014 through 2016, the Internal Revenue Service (IRS) has accepted Loews and the Company into the Compliance Assurance Process (CAP), which is a voluntary program for large corporations. Under CAP, the IRS conducts a real-time audit and works contemporaneously with the Company to resolve any issues prior to the filing of the tax return. The Company believes that this approach should reduce tax-related uncertainties, if any.

As of December 31, 2016 and 2015, there were no unrecognized tax benefits.

The Company recognizes interest accrued related to: 1) unrecognized tax benefits in Interest expense and 2) tax refund claims in Other revenues on the Consolidated Statements of Operations. The Company recognizes penalties (if any) in Income tax (expense) benefit on the Consolidated Statements of Operations. During 2016, 2015 and 2014 the Company recognized no interest and no penalties. There were no amounts accrued for interest or penalties as of December 31, 2016 or 2015.

The following table presents a reconciliation between the Company's federal income tax expense at statutory rates and the recorded income tax expense, excluding discontinued operations.

Years ended December 31
(In millions)	2016			2015			2014
Income tax expense at statutory rates	$	(398	)	$	(192	)	$	(423	)
Tax benefit from tax exempt income	124			123			119
Foreign taxes and credits	3			9			(6		)
Other tax expense	(7		)	(10		)	(9		)
Income tax expense	$	(278	)	$	(70	)	$	(319	)

Provision has not been made for the Company's investment in certain subsidiaries for which the Company intends to invest the undistributed earnings indefinitely. As of December 31, 2016, the Company has not provided deferred taxes of $1 million on $3 million of undistributed earnings related to a foreign subsidiary.

The following table presents the current and deferred components of the Company's income tax expense, excluding discontinued operations.

Years ended December 31
(In millions)	2016			2015			2014
Current tax expense	$	(142	)	$	(220	)	$	(318	)
Deferred tax benefit (expense)	(136		)	150			(1		)
Total income tax expense	$	(278	)	$	(70	)	$	(319	)

Total income tax presented above includes foreign tax expense of approximately $9 million, $14 million and $24 million related to income from continuing foreign operations of approximately $51 million, $71 million and $66 million for the years ended December 31, 2016, 2015 and 2014.

The deferred tax effects of the significant components of the Company's deferred tax assets and liabilities are presented in the following table.

December 31
(In millions)	2016		2015
Deferred Tax Assets:
Insurance reserves:
Property and casualty claim and claim adjustment expense reserves	$	125	$	178
Unearned premium reserves	206		230
Receivables	27		29
Employee benefits	272		281
Life settlement contracts	56		48
Deferred retroactive reinsurance benefit	117		84
Investment valuation differences	—		29
Other assets	148		142
Gross deferred tax assets	951		1,021
Deferred Tax Liabilities:
Investment valuation differences	57		—
Deferred acquisition costs	120		117
Net unrealized gains	309		202
Other liabilities	86		64
Gross deferred tax liabilities	572		383
Net deferred tax asset	$	379	$	638

As of December 31, 2016, the CNA Tax Group had no loss carryforwards or tax credit carryforwards.

Although realization of deferred tax assets is not assured, management believes it is more likely than not that the recognized net deferred tax asset will be realized through recoupment of ordinary and capital taxes paid in prior carryback years and through future earnings, reversal of existing temporary differences and available tax planning strategies. As a result, no valuation allowance was recorded as of December 31, 2016 or 2015.

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Claim and Claim Adjustment Expense Reserves

12 Months Ended

Dec. 31, 2016

Liability for Claims and Claims Adjustment Expense [Abstract]

Claim and Claim Adjustment Expense Reserves

Note E. Claim and Claim Adjustment Expense Reserves

The Company's property and casualty insurance claim and claim adjustment expense reserves represent the estimated amounts necessary to resolve all outstanding claims, including IBNR claims as of the reporting date. The Company's reserve projections are based primarily on detailed analysis of the facts in each case, the Company's experience with similar cases and various historical development patterns. Consideration is given to such historical patterns as claim reserving trends and settlement practices, loss payments, pending levels of unpaid claims and product mix, as well as court decisions, economic conditions, including inflation, and public attitudes. All of these factors can affect the estimation of claim and claim adjustment expense reserves.

Establishing claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves for catastrophic events that have occurred, is an estimation process. Many factors can ultimately affect the final settlement of a claim and, therefore, the necessary reserve. Changes in the law, results of litigation, medical costs, the cost of repair materials and labor rates can all affect ultimate claim costs. In addition, time can be a critical part of reserving determinations since the longer the span between the incidence of a loss and the payment or settlement of the claim, the more variable the ultimate settlement amount can be. Accordingly, short-tail claims, such as property damage claims, tend to be more reasonably estimable than long-tail claims, such as workers' compensation, general liability and professional liability claims. Adjustments to prior year reserve estimates, if necessary, are reflected in the results of operations in the period that the need for such adjustments is determined. There can be no assurance that the Company's ultimate cost for insurance losses will not exceed current estimates.

Catastrophes are an inherent risk of the property and casualty insurance business and have contributed to material period-to-period fluctuations in the Company's results of operations and/or equity. The Company reported catastrophe losses, net of reinsurance, of $165 million, $141 million and $156 million for the years ended December 31, 2016, 2015 and 2014. Catastrophe losses in 2016 related primarily to U.S. weather-related events and the Fort McMurray wildfires.

In developing claim and claim adjustment expense (“loss” or “losses”) reserve estimates, our actuaries perform detailed reserve analyses that are staggered throughout the year. Every reserve group is reviewed at least once during the year. The analyses generally review losses gross of ceded reinsurance and apply the ceded reinsurance terms to the gross estimates to establish estimates net of reinsurance. In addition to the detailed analyses, we review actual loss emergence for all products each quarter. In developing the loss reserve estimates for property and casualty contracts, we generally project ultimate losses using several common actuarial methods as listed below. We review the various indications from the various methods and apply judgment to select an actuarial point estimate. The indicated required reserve is the difference between the selected ultimate loss and the inception-to-date paid losses. The difference between the selected ultimate loss and the case incurred or reported loss is IBNR. IBNR includes a provision for development on known cases as well as a provision for late reported incurred claims. Further, the Company does not establish case reserves for allocated loss adjustment expenses (ALAE), therefore all ALAE reserves are included in our estimate of IBNR. The most frequently utilized methods to project ultimate losses include the following:

•paid development;

•incurred development;

•loss ratio;

•Bornhuetter-Ferguson using premiums and paid loss;

•Bornhuetter-Ferguson using premiums and incurred loss;

•frequency times severity; and

•stochastic modeling.

The paid development method estimates ultimate losses by reviewing paid loss patterns and applying them to accident years with further expected changes in paid loss. The incurred development method is similar to the paid development method, but it uses case incurred losses instead of paid losses. The loss ratio method multiplies premiums by an expected loss ratio to produce ultimate loss estimates for each accident year. The Bornhuetter-Ferguson using premiums and paid loss method is a combination of the paid development approach and the loss ratio approach. This method normally determines expected loss ratios similar to the approach used to estimate the expected loss ratio for the loss ratio method. The Bornhuetter-Ferguson using premiums and incurred loss method is similar to the Bornhuetter-Ferguson using premiums and paid loss method except that it uses case incurred losses. The frequency times severity method multiplies a projected number of ultimate claims by an estimated ultimate average loss for each accident year to produce ultimate loss estimates. Stochastic modeling produces a range of possible outcomes based on varying assumptions related to the particular product being modeled.

For many exposures, especially those that can be considered long-tail, a particular accident or policy year may not have a sufficient volume of paid losses to produce a statistically reliable estimate of ultimate losses. In such a case, our actuaries typically assign more weight to the incurred development method than to the paid development method. As claims continue to settle and the volume of paid loss increases, the actuaries may assign additional weight to the paid development method. For most of our products, even the incurred losses for accident or policy years that are early in the claim settlement process will not be of sufficient volume to produce a reliable estimate of ultimate losses. In these cases, we may not assign any weight to the paid and incurred development methods. We will use the loss ratio, Bornhuetter-Ferguson and frequency times severity methods. For short-tail exposures, the paid and incurred development methods can often be relied on sooner, primarily because our history includes a sufficient number of years to cover the entire period over which paid and incurred losses are expected to change. However, we may also use the loss ratio, Bornhuetter-Ferguson and frequency times severity methods for short-tail exposures. For other more complex reserve groups where the above methods may not produce reliable indications, we use additional methods tailored to the characteristics of the specific situation.

Reserves for policyholder benefits for our Life & Group Non-Core segment, which primarily includes long term care, are based on actuarial assumptions which include estimates of morbidity, persistency, discount rates and expenses over the life of the contracts. Under GAAP, the best estimates of the actuarial assumptions at the date the contract was issued are locked-in throughout the life of the contract, unless a premium deficiency develops, which occurred in 2015. As a result, the Company updated the assumptions to represent management’s best estimates at the time of the premium deficiency and these revised assumptions are locked-in unless another premium deficiency is identified.

Certain claim liabilities are more difficult to estimate and have differing methodologies and considerations which are described below.

Our mass tort and A&EP reserving methodologies are similar as both are based on detailed account reviews of all large accounts with estimates based on ultimate payments considering the applicable law and coverage litigation. These reserves are subject to greater inherent variability than is typical of the remainder of the Company’s reserves due to, among other things, a general lack of sufficiently detailed data, expansion of the population being held responsible for these exposures and significant unresolved legal issues such as the existence of coverage and the definition of an occurrence.

Our actuarial reserve analyses result in point estimates. Each quarter, the results of detailed reserve reviews are summarized and discussed with our senior management to determine management's best estimate of reserves. Senior management considers many factors in making this decision. The factors include, but are not limited to, the historical pattern and volatility of the actuarial indications, the sensitivity of the actuarial indications to changes in paid and incurred loss patterns, the consistency of claims handling processes, the consistency of case reserving practices, changes in our pricing and underwriting, pricing and underwriting trends in the insurance market and legal, judicial, social and economic trends. Our recorded reserves reflect our best estimate as of a particular point in time based upon known facts, consideration of the factors cited above and our judgment. The carried reserve may differ from the actuarial point estimate as the result of our consideration of the factors noted above as well as the potential volatility of the projections associated with the specific product being analyzed and other factors affecting claims costs that may not be quantifiable through traditional actuarial analysis.

The loss reserve development tables presented herein illustrate the change over time of reserves established for claim and allocated claim adjustment expenses arising from short duration insurance contracts for certain lines of business within our property & casualty segments. Not all lines of business or segments are presented based on their context to the Company's overall loss reserves, calendar year reserve development, or calendar year net earned premiums. Insurance contracts are considered to be short duration contracts when the contracts are not expected to remain in force for an extended period of time. The Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses tables, reading across, show the cumulative net incurred claim and allocated claim adjustment expenses relating to each accident year at the end of the stated calendar year. Changes in the cumulative amount across time are the result of the Company's expanded awareness of additional facts and circumstances that pertain to the unsettled claims. The Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses tables, reading across, show the cumulative amount paid for claims in each accident year as of the end of the stated calendar year. The Net Strengthening or (Releases) of Prior Accident Year Reserves tables, reading across, show the net increase or decrease in the cumulative net incurred accident year claim and allocated claim adjustment expenses during each stated calendar year and indicates whether the reserves for that accident year were strengthened or released.

The information in the tables is reported on a net basis after reinsurance and does not include unallocated claim and claim adjustment expenses or the effects of discounting. The information contained in the years preceding the current calendar year is unaudited. Information contained in the tables pertaining to our International segment has been presented at the year-end 2016 foreign currency exchange rates for all periods presented to remove the effects of foreign currency exchange rate changes between calendar years. The Company has presented development information for the Hardy business prospectively from the date of acquisition and is presented as a separate table within our International segment. To the extent the Company enters into a commutation, the transaction is reported on a prospective basis. To the extent that the Company enters into a disposition, the effects of the disposition are reported on a retrospective basis by removing the balances associated with the disposed of business.

The amounts reported for the cumulative number of reported claims include direct and assumed open and closed claims by accident year at the claimant level. The number excludes claim counts for claims within a policy deductible where the insured is responsible for payment of losses in the deductible layer. Claim count data for certain assumed reinsurance contracts is unavailable.

In the loss reserve development tables, IBNR includes reserves for incurred but not reported losses and expected development on case reserves. The Company does not case reserve ALAE, therefore all ALAE reserves are also included in the estimate of IBNR.

Liability for Unpaid Claim and Claim Adjustment Expenses Rollforward

The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves of the Life & Group Non-Core segment.

As of or for the years ended December 31
(In millions)	2016			2015			2014
Reserves, beginning of year:
Gross	$	22,663		$	23,271		$	24,089
Ceded	4,087			4,344			4,972
Net reserves, beginning of year	18,576			18,927			19,117
Change in net reserves due to acquisition (disposition) of subsidiaries	—			—			(13		)
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year	5,025			4,934			5,043
Decrease in provision for insured events of prior years	(342		)	(255		)	(36		)
Amortization of discount	175			166			161
Total net incurred (1)	4,858			4,845			5,168
Net payments attributable to:
Current year events	(967		)	(856		)	(945		)
Prior year events	(4,167		)	(4,089		)	(4,355		)
Total net payments	(5,134		)	(4,945		)	(5,300		)
Foreign currency translation adjustment and other	(51		)	(251		)	(45		)
Net reserves, end of year	18,249			18,576			18,927
Ceded reserves, end of year	4,094			4,087			4,344
Gross reserves, end of year	$	22,343		$	22,663		$	23,271

(1) Total net incurred above does not agree to Insurance claims and policyholders' benefits as reflected on the Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance and loss deductible receivables, and benefit expenses related to future policy benefits, which are not reflected in the table above.

The following tables present the gross and net carried reserves.

December 31, 2016	Specialty		Commercial		International		Life & Group Non-Core		Corporate & Other Non-Core		Total
(In millions)
Gross Case Reserves	$	1,871	$	4,661	$	632	$	3,172	$	1,524	$	11,860
Gross IBNR Reserves	4,278		4,233		696		186		1,090		10,483
Total Gross Carried Claim and Claim Adjustment Expense Reserves	$	6,149	$	8,894	$	1,328	$	3,358	$	2,614	$	22,343
Net Case Reserves	$	1,681	$	4,353	$	548	$	2,951	$	94	$	9,627
Net IBNR Reserves	3,723		3,952		653		158		136		8,622
Total Net Carried Claim and Claim Adjustment Expense Reserves	$	5,404	$	8,305	$	1,201	$	3,109	$	230	$	18,249

December 31, 2015	Specialty		Commercial		International		Life & Group Non-Core		Corporate & Other Non-Core		Total
(In millions)
Gross Case Reserves	$	2,011	$	4,975	$	622	$	2,973	$	1,521	$	12,102
Gross IBNR Reserves	4,258		4,208		725		247		1,123		10,561
Total Gross Carried Claim and Claim Adjustment Expense Reserves	$	6,269	$	9,183	$	1,347	$	3,220	$	2,644	$	22,663
Net Case Reserves	$	1,810	$	4,651	$	531	$	2,714	$	130	$	9,836
Net IBNR Reserves	3,758		3,925		688		216		153		8,740
Total Net Carried Claim and Claim Adjustment Expense Reserves	$	5,568	$	8,576	$	1,219	$	2,930	$	283	$	18,576

Net Prior Year Development

Changes in estimates of claim and allocated claim adjustment expense reserves and premium accruals, net of reinsurance, for prior years are defined as net prior year development. These changes can be favorable or unfavorable. The following tables and discussion present the net prior year development recorded for Specialty, Commercial, International and Corporate & Other Non-Core segments.

Year ended December 31, 2016
(In millions)	Specialty			Commercial			International			Corporate & Other Non-Core		Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(287	)	$	55		$	(58	)	$	2	$	(288	)
Pretax (favorable) unfavorable premium development	(18		)	(2		)	(6		)	—		(26		)
Total pretax (favorable) unfavorable net prior year development	$	(305	)	$	53		$	(64	)	$	2	$	(314	)

Year ended December 31, 2015
(In millions)	Specialty			Commercial			International			Corporate & Other Non-Core		Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(141	)	$	(15	)	$	(54	)	$	—	$	(210	)
Pretax (favorable) unfavorable premium development	(11		)	(15		)	18			—		(8		)
Total pretax (favorable) unfavorable net prior year development	$	(152	)	$	(30	)	$	(36	)	$	—	$	(218	)

Year ended December 31, 2014
(In millions)	Specialty			Commercial			International			Corporate & Other Non-Core			Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(136	)	$	176		$	(59	)	$	(2	)	$	(21	)
Pretax (favorable) unfavorable premium development	(13		)	(20		)	2			(1		)	(32		)
Total pretax (favorable) unfavorable net prior year development	$	(149	)	$	156		$	(57	)	$	(3	)	$	(53	)

Favorable net prior year development of $45 million, $50 million and $14 million was recorded in the Life & Group Non-Core segment for the years ended December 31, 2016, 2015 and 2014. The favorable net prior year development for the year ended December 31, 2016 was driven by a reserve release resulting from the annual experience study of long term care claim reserves which indicated lower than expected claim severity.

Premium development can occur in the property and casualty business when there is a change in exposure on auditable policies or when premium accruals differ from processed premium.  Audits on policies usually occur in a period after the expiration date of the policy.

Specialty

The following table presents further detail of the net prior year claim and allocated claim adjustment expense reserve development (development) recorded for the Specialty segment.

Years ended December 31
(In millions)	2016			2015			2014
Pretax (favorable) unfavorable development:
Medical Professional Liability	$	(37	)	$	(43	)	$	39
Other Professional Liability and Management Liability	(130		)	—			(87		)
Surety	(63		)	(69		)	(82		)
Warranty	4			(2		)	(2		)
Other	(61		)	(27		)	(4		)
Total pretax (favorable) unfavorable development	$	(287	)	$	(141	)	$	(136	)

2016

Favorable development for medical professional liability was primarily due to lower than expected severities for individual healthcare professionals, allied facilities and hospitals in accident years 2011 and prior and better than expected severity in medical products liability in accident years 2010 through 2015. This was partially offset by unfavorable development in accident years 2012 and 2013 related to higher than expected large loss emergence in hospitals and higher than expected frequency and severity in accident years 2014 and 2015 in our aging services business.

Favorable development in other professional liability and management liability was primarily due to favorable settlements on closed claims and lower than expected frequency of claims in accident years 2010 through 2014 related to professional services and financial institutions. This was partially offset by unfavorable development related to a specific financial institutions claim in accident year 2014, higher management liability severities in accident year 2015, and deterioration on credit crises-related claims in accident year 2009.

Favorable development in surety coverages was primarily due to lower than expected frequency of large losses in accident years 2014 and prior.

Favorable development for other coverages provided to Specialty customers was due to better than expected claim frequency and claim severity in commercial lines coverages in accident years 2010 through 2015.

2015

Overall, favorable development for medical professional liability was related to lower than expected severity in accident years 2012 and prior. Unfavorable development was recorded related to increased claim frequency and severity in the aging services business in accident years 2013 and 2014.

Favorable development in other professional liability and management liability related to better than expected large loss emergence in financial institutions primarily in accident years 2011 through 2014. Additional favorable development related to lower than expected severity for professional services in accident years 2011 and prior. Unfavorable development was recorded related to increased frequency of large claims on public company management liability in accident years 2012 through 2014.

Favorable development for surety coverages was primarily due to lower than expected frequency of large losses in accident years 2013 and prior.

Favorable development for other coverages was due to better than expected claim frequency in property coverages provided to Specialty customers in accident year 2014.

2014

Unfavorable development for medical professional liability was primarily related to increased frequency of large medical products liability class action lawsuits in accident years 2012 and prior and increased frequency of other large medical professional liability losses in accident years 2011 through 2013.

Overall, favorable development for other professional liability and management liability was related to better than expected severity in accident years 2008 through 2011, including favorable outcomes on individual large claims. Additional favorable development related to lower than expected frequency in accident years 2011 through 2013. Unfavorable development was recorded due to higher than expected severity in financial institution and professional service coverages in accident years 2009 through 2011.

Favorable development for surety coverages was primarily due to better than expected large loss emergence in accident years 2012 and prior.

Specialty - Line of Business Composition

The table below provides the line of business composition of the net liability for unpaid claim and claim adjustment expenses for the Specialty segment.

As of December 31
(In millions)	2016
Net liability for unpaid claim and claim adjustment expenses:
Medical Professional Liability	$	1,779
Other Professional Liability and Management Liability	3,063
Surety	394
Warranty	37
Other	131
Total net liability for unpaid claim and claim adjustment expenses	$	5,404

Specialty - Medical Professional Liability

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	448	$	452	$	444	$	427	$	395	$	391	$	390	$	401	$	399	$	385	$	9	12,122
2008			426		451		496		480		468		468		467		455		442		9		14,094
2009					462		469		494		506		480		471		463		432		12		15,573
2010							483		478		478		486		470		446		403		16		15,206
2011									486		492		507		533		501		491		23		17,428
2012											526		529		575		567		559		47		18,375
2013													534		540		560		567		95		19,565
2014															511		548		585		165		19,286
2015																	480		539		278		16,798
2016																			469		400		11,600
																	Total		$	4,872	$	1,054

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	11	$	68	$	134	$	201	$	247	$	296	$	326	$	352	$	364	$	365
2008			9		90		207		282		332		377		395		409		428
2009					9		75		180		278		328		353		377		396
2010							11		93		186		273		338		361		371
2011									18		121		225		315		379		407
2012											15		121		236		359		428
2013													18		121		259		364
2014															25		149		274
2015																	22		105
2016																			18
																	Total		$	3,156
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	1,716
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			30
Liability for unallocated claim adjustment expenses for accident years presented																			33
Total net liability for unpaid claim and claim adjustment expenses																			$	1,779

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	4	$	(8	)	$	(17	)	$	(32	)	$	(4	)	$	(1	)	$	11		$	(2	)	$	(14	)	$	(63	)
2008			25			45			(16		)	(12		)	—			(1		)	(12		)	(13		)	16
2009						7			25			12			(26		)	(9		)	(8		)	(31		)	(30		)
2010									(5		)	—			8			(16		)	(24		)	(43		)	(80		)
2011												6			15			26			(32		)	(10		)	5
2012															3			46			(8		)	(8		)	33
2013																		6			20			7			33
2014																					37			37			74
2015																								59			59
Total net development for the accident years presented above																		$	63		$	(29	)	$	(16	)
Total net development for accident years prior to 2007																		(24		)	(14		)	(21		)
Total																		$	39		$	(43	)	$	(37	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

Specialty - Other Professional Liability and Management Liability

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	804	$	817	$	806	$	754	$	734	$	724	$	704	$	681	$	662	$	662	$	13	16,011
2008			916		933		954		924		915		880		850		845		827		35		16,326
2009					829		873		903		898		891		900		895		903		50		17,263
2010							825		827		850		848		846		836		823		39		17,796
2011									876		904		933		948		944		910		107		18,620
2012											907		894		876		870		833		107		18,228
2013													844		841		879		840		137		17,324
2014															841		859		854		306		16,886
2015																	847		851		478		16,391
2016																			859		742		15,045
																	Total		$	8,362	$	2,014

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	32	$	162	$	307	$	397	$	472	$	524	$	564	$	585	$	593	$	614
2008			39		181		376		515		600		641		678		719		741
2009					37		195		358		550		638		719		769		798
2010							31		203		404		541		630		670		721
2011									71		313		502		604		682		726
2012											57		248		398		570		648
2013													51		240		426		583
2014															51		212		375
2015																	48		209
2016																			60
																	Total		$	5,475
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	2,887
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			104
Liability for unallocated claim adjustment expenses for accident years presented																			72
Total net liability for unpaid claim and claim adjustment expenses																			$	3,063

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	13	$	(11	)	$	(52	)	$	(20	)	$	(10	)	$	(20	)	$	(23	)	$	(19	)	$	—		$	(142	)
2008			17			21			(30		)	(9		)	(35		)	(30		)	(5		)	(18		)	(89		)
2009						44			30			(5		)	(7		)	9			(5		)	8			74
2010									2			23			(2		)	(2		)	(10		)	(13		)	(2		)
2011												28			29			15			(4		)	(34		)	34
2012															(13		)	(18		)	(6		)	(37		)	(74		)
2013																		(3		)	38			(39		)	(4		)
2014																					18			(5		)	13
2015																								4			4
Total net development for the accident years presented above																		$	(52	)	$	7		$	(134	)
Total net development for accident years prior to 2007																		(35		)	(7		)	4
Total																		$	(87	)	$	—		$	(130	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

Specialty - Surety

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	98	$	107	$	81	$	57	$	59	$	56	$	51	$	49	$	49	$	50	$	—	6,270
2008			114		114		73		68		61		52		48		45		44		—		7,153
2009					114		114		103		85		68		59		52		53		1		6,654
2010							112		112		111		84		76		66		63		8		5,943
2011									120		121		116		87		75		70		9		5,760
2012											120		122		98		70		52		16		5,473
2013													120		121		115		106		24		4,890
2014															123		124		94		51		4,737
2015																	131		131		100		4,279
2016																			124		110		2,902
																	Total		$	787	$	319

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	12	$	30	$	40	$	45	$	46	$	46	$	46	$	48	$	49	$	50
2008			9		27		35		39		42		43		43		43		43
2009					13		24		34		41		43		45		46		47
2010							13		34		50		55		57		58		55
2011									19		42		55		58		60		60
2012											5		32		34		35		35
2013													16		40		69		78
2014															7		30		38
2015																	7		26
2016																			5
																	Total		$	437
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	350
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			16
Liability for unallocated claim adjustment expenses for accident years presented																			28
Total net liability for unpaid claim and claim adjustment expenses																			$	394

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	9	$	(26	)	$	(24	)	$	2		$	(3	)	$	(5	)	$	(2	)	$	—		$	1		$	(48	)
2008			—			(41		)	(5		)	(7		)	(9		)	(4		)	(3		)	(1		)	(70		)
2009						—			(11		)	(18		)	(17		)	(9		)	(7		)	1			(61		)
2010									—			(1		)	(27		)	(8		)	(10		)	(3		)	(49		)
2011												1			(5		)	(29		)	(12		)	(5		)	(50		)
2012															2			(24		)	(28		)	(18		)	(68		)
2013																		1			(6		)	(9		)	(14		)
2014																					1			(30		)	(29		)
2015																								—			—
Total net development for the accident years presented above																		$	(75	)	$	(65	)	$	(64	)
Total net development for accident years prior to 2007																		(7		)	(4		)	1
Total																		$	(82	)	$	(69	)	$	(63	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

Commercial

The following table presents further detail of the development recorded for the Commercial segment.

Years ended December 31
(In millions)	2016			2015			2014
Pretax (favorable) unfavorable development:
Commercial Auto	$	(46	)	$	(22	)	$	31
General Liability	(28		)	(33		)	45
Workers' Compensation	150			80			139
Property and Other	(21		)	(40		)	(39		)
Total pretax (favorable) unfavorable development	$	55		$	(15	)	$	176

2016

Favorable development for commercial auto was primarily due to favorable settlements on claims in accident years 2010 through 2014 and lower than expected severities in accident years 2012 through 2015.

Favorable development for general liability was primarily due to better than expected claim settlements in accident years 2012 through 2014 and better than expected severity on umbrella claims in accident years 2010 through 2013. This was partially offset by unfavorable development related to an increase in reported claims prior to the closing of the three year window set forth by the Minnesota Child Victims Act in accident years 2006 and prior.

Unfavorable development for workers' compensation was primarily due to higher than expected severity for Defense Base Act contractors that largely resulted from a reduction of expected future recoveries from the US Department of Labor under the War Hazard Act. Further unfavorable development was due to the impact of recent Florida court rulings for accident years 2008 through 2015. These were partially offset by favorable development related to lower than expected frequencies related to our ongoing Middle Market and Small Business results for accident years 2009 through 2014.

Favorable development for property and other was primarily due to better than expected loss frequency in accident years 2013 through 2015. This was partially offset by unfavorable development related to higher than expected severity from a fourth quarter 2015 catastrophe event.

2015

Favorable development for commercial auto was primarily due to lower than expected severity in accident years 2009 through 2014.

Favorable development for general liability was primarily due to favorable settlements on claims in accident years 2010 through 2013.

Unfavorable development for workers’ compensation was primarily due to higher than expected severity related to Defense Base Act contractors in accident years 2008 through 2014.

Favorable development for property and other was primarily due to better than expected claim emergence from 2012 and 2014 catastrophe events and better than expected frequency of large claims in accident year 2014.

The year ended December 31, 2015 also included unfavorable loss development related to extra contractual obligation losses and losses associated with premium development.

2014

Unfavorable development for commercial auto was primarily related to higher than expected frequency in accident years 2012 and 2013 and higher than expected severity for liability coverages in accident years 2010 through 2013. Favorable development was recorded related to fewer large claims than expected in accident years 2008 and 2009.

Overall, unfavorable development for general liability was primarily related to higher than expected severity in accident years 2010 through 2013. Favorable development was recorded primarily related to lower than expected frequency of large losses in accident years 2005 through 2009.

Overall, unfavorable development for workers’ compensation was primarily due to increased medical severity in accident years 2010 and prior, higher than expected severity related to Defense Base Act contractors in accident years 2010 through 2013 and the recognition of losses related to favorable premium development in accident year 2013. Favorable development of $26 million was recorded in accident years 1996 and prior related to the commutation of a workers’ compensation reinsurance pool.

Favorable development for property and other first-party coverages was recorded in accident years 2013 and prior, primarily related to fewer claims than expected and favorable individual claim settlements.

Commercial - Line of Business Composition

The table below provides the line of business composition of the net liability for unpaid claim and claim adjustment expenses for the Commercial segment.

As of December 31
(In millions)	2016
Net Claim and claim adjustment expenses:
Commercial Auto	$	424
General Liability	3,248
Workers' Compensation	4,306
Property and Other	327
Total net liability for claim and claim adjustment expenses	$	8,305

Commercial - Commercial Auto

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	348	$	367	$	368	$	360	$	355	$	358	$	356	$	355	$	354	$	352	$	—	67,473
2008			322		323		316		306		309		305		298		298		296		—		56,407
2009					287		272		274		278		281		277		275		272		—		47,325
2010							262		274		279		283		291		286		281		1		46,324
2011									262		273		279		293		290		285		5		46,676
2012											270		282		292		296		300		11		45,279
2013													242		259		257		241		20		38,513
2014															231		221		210		40		32,958
2015																	199		197		65		29,714
2016																			196		105		25,196
																	Total		$	2,630	$	247

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	93	$	185	$	250	$	295	$	329	$	340	$	348	$	349	$	350	$	351
2008			83		158		210		244		274		289		291		292		293
2009					72		128		188		229		257		269		270		270
2010							72		137		197		240		265		274		279
2011									78		141		193		241		264		275
2012											77		157		214		253		276
2013													73		132		164		195
2014															63		100		135
2015																	52		95
2016																			51
																	Total		$	2,220
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	410
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			4
Liability for unallocated claim adjustment expenses for accident years presented																			10
Total net liability for unpaid claim and claim adjustment expenses																			$	424

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)		2010(1)			2011(1)			2012(1)		2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	19	$	1	$	(8	)	$	(5	)	$	3	$	(2	)	$	(1	)	$	(1	)	$	(2	)	$	4
2008			1		(7		)	(10		)	3		(4		)	(7		)	—			(2		)	(26		)
2009					(15		)	2			4		3			(4		)	(2		)	(3		)	(15		)
2010								12			5		4			8			(5		)	(5		)	19
2011											11		6			14			(3		)	(5		)	23
2012													12			10			4			4			30
2013																17			(2		)	(16		)	(1		)
2014																			(10		)	(11		)	(21		)
2015																						(2		)	(2		)
Total net development for the accident years presented above																$	37		$	(19	)	$	(42	)
Total net development for accident years prior to 2007																(6		)	(3		)	(4		)
Total																$	31		$	(22	)	$	(46	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

Commercial - General Liability

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	774	$	673	$	678	$	639	$	610	$	600	$	559	$	545	$	548	$	540	$	28	53,553
2008			611		604		630		647		633		632		613		600		591		18		44,586
2009					591		637		634		633		629		623		619		622		16		43,955
2010							566		597		599		649		695		675		659		25		43,378
2011									537		534		564		610		611		621		41		38,101
2012											539		563		579		570		558		63		34,037
2013													615		645		634		643		142		32,897
2014															627		634		635		224		26,744
2015																	573		574		330		21,687
2016																			622		495		16,720
																	Total		$	6,065	$	1,382

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	30	$	130	$	236	$	328	$	413	$	458	$	481	$	492	$	497	$	504
2008			31		129		261		390		473		528		550		560		567
2009					33		112		270		392		486		532		557		584
2010							27		139		267		414		530		577		608
2011									27		135		253		389		484		534
2012											27		127		233		340		417
2013													33		135		257		377
2014															29		115		245
2015																	31		132
2016																			34
																	Total		$	4,002
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	2,063
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			1,130
Liability for unallocated claim adjustment expenses for accident years presented																			55
Total net liability for unpaid claim and claim adjustment expenses																			$	3,248

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)			2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	(101	)	$	5		$	(39	)	$	(29	)	$	(10	)	$	(41	)	$	(14	)	$	3		$	(8	)	$	(234	)
2008				(7		)	26			17			(14		)	(1		)	(19		)	(13		)	(9		)	(20		)
2009							46			(3		)	(1		)	(4		)	(6		)	(4		)	3			31
2010										31			2			50			46			(20		)	(16		)	93
2011													(3		)	30			46			1			10			84
2012																24			16			(9		)	(12		)	19
2013																			30			(11		)	9			28
2014																						7			1			8
2015																									1			1
Total net development for the accident years presented above																			$	99		$	(46	)	$	(21	)
Total net development for accident years prior to 2007																			(54		)	13			(7		)
Total																			$	45		$	(33	)	$	(28	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

Commercial - Workers' Compensation

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	568	$	580	$	596	$	604	$	603	$	603	$	604	$	610	$	608	$	627	$	32	71,049
2008			558		575		593		606		608		612		622		630		638		36		59,883
2009					583		587		594		596		600		611		617		625		46		51,111
2010							576		619		641		663		683		697		717		45		48,056
2011									593		628		637		648		642		666		52		44,571
2012											589		616		648		661		671		86		41,683
2013													528		563		584		610		121		38,102
2014															459		474		474		157		32,996
2015																	416		426		206		31,296
2016																			421		287		27,042
																	Total		$	5,875	$	1,068

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	100	$	246	$	337	$	390	$	429	$	471	$	502	$	522	$	533	$	535
2008			92		233		323		381		425		461		489		505		520
2009					88		223		315		381		435		468		495		516
2010							94		245		352		433		500		531		565
2011									97		245		353		432		471		515
2012											86		229		338		411		465
2013													79		211		297		366
2014															60		157		213
2015																	50		130
2016																			52
																	Total		$	3,877
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	1,998
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			2,334
Other (2)																			(30		)
Liability for unallocated claim adjustment expenses for accident years presented																			4
Total net liability for unpaid claim and claim adjustment expenses																			$	4,306

(2) Other includes the effect of discounting lifetime claim reserves.

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)		2010(1)		2011(1)			2012(1)		2013(1)		2014(1)		2015(1)			2016		Total
Accident Year
2007	$	12	$	16	$	8	$	(1	)	$	—	$	1	$	6	$	(2	)	$	19	$	59
2008			17		18		13			2		4		10		8			8		80
2009					4		7			2		4		11		6			8		42
2010							43			22		22		20		14			20		141
2011										35		9		11		(6		)	24		73
2012												27		32		13			10		82
2013														35		21			26		82
2014																15			—		15
2015																			10		10
Total net development for the accident years presented above														$	125	$	69		$	125
Adjustment for development on a discounted basis														1		(4		)	1
Total net development for accident years prior to 2007														13		15			24
Total														$	139	$	80		$	150

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

International

The following table presents further detail of the development recorded for the International segment.

Years ended December 31
(In millions)	2016			2015			2014
Pretax (favorable) unfavorable development:
Medical Professional Liability	$	(5	)	$	(9	)	$	(7	)
Other Professional Liability	12			(16		)	(26		)
Liability	(30		)	(17		)	(13		)
Property & Marine	(34		)	(29		)	(4		)
Other	(1		)	17			(9		)
Total pretax (favorable) unfavorable development	$	(58	)	$	(54	)	$	(59	)

2016

Unfavorable development for other professional liability was primarily due to higher than expected large loss emergence in accident years 2011 through 2015 associated with our Commercial Institutions business, partially offset by favorable settlements on claims in accident years 2013 and prior.

Favorable development for liability was primarily due to favorable settlements on claims in accident years 2013 and prior related to our Canadian package business. Additional favorable development in accident years 2013 and 2015 was primarily due to lower than expected frequency of large losses related to our Europe business.

Favorable development for property and marine was due to better than expected severity on the December 2015 UK Floods and better than expected attritional losses and large loss experience on accident years 2013 through 2015 for Hardy business. Additional favorable development was due to a commutation of exposures in marine run-off classes on our Europe business.

2015

Favorable development in medical professional liability was due to better than expected frequency of losses in accident years 2011 to 2013.

Favorable development in other professional liability was due to better than expected large loss emergence in accident years 2011 and prior.

Favorable development in liability was due to better than expected large loss emergence in accident years 2012 and prior.

Favorable development in property and marine was due to better than expected individual large loss emergence and favorable settlements on large claims in accident years 2013 and 2014.

Unfavorable development in other is due to higher than expected large losses in financial institutions and political risk, primarily in accident year 2014.

2014

Overall, favorable development for other professional liability was primarily related to better than expected severity in accident years 2012 and prior. Unfavorable development was recorded in accident year 2008 due to financial crisis claims.

Favorable development for liability was primarily related to better than expected frequency and severity in accident years 2009 and subsequent.

Favorable development for property and marine coverages primarily related to better than expected frequency of large claims in accident years 2012 and prior. Reinsurance commutations in the first quarter of 2014 reduced ceded losses from prior years. Overall the commutations increased net operating income because of the release of the related allowance for uncollectible reinsurance.

Favorable development for other coverages was a result of better than expected frequency in Hardy, primarily in financial institution coverages.

International - Line of Business Composition

The table below provides the composition of the net liability for unpaid claim and claim adjustment expenses for the International segment.

As of December 31
(In millions)	2016
Net Claim and claim adjustment expenses:
International excluding Hardy	$	881
Hardy	320
Total net liability for claim and claim adjustment expenses	$	1,201

International - Excluding Hardy

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	204	$	219	$	213	$	194	$	181	$	172	$	164	$	162	$	160	$	159	$	4	27,149
2008			223		226		214		207		207		200		209		210		207		7		25,119
2009					249		245		247		247		234		231		222		213		13		21,362
2010							226		223		217		211		203		196		190		18		22,877
2011									259		260		253		233		223		216		14		25,361
2012											259		266		252		245		244		34		25,306
2013													281		282		275		256		56		23,999
2014															269		284		284		82		24,859
2015																	282		297		107		22,873
2016																			276		149		15,564
																	Total		$	2,342	$	484

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	31	$	99	$	112	$	124	$	133	$	140	$	144	$	148	$	150	$	152
2008			34		84		126		135		143		151		165		172		190
2009					38		90		119		134		149		159		170		181
2010							47		93		115		130		143		151		160
2011									44		111		133		146		159		171
2012											42		109		142		161		176
2013													49		109		135		152
2014															51		119		145
2015																	55		130
2016																			64
Total																			$	1,521
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	821
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			38
Liability for unallocated claim adjustment expenses for accident years presented																			22
Total net liability for unpaid claim and claim adjustment expenses																			$	881

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total (2)
Accident Year
2007	$	15	$	(6	)	$	(19	)	$	(13	)	$	(9	)	$	(8	)	$	(2	)	$	(2	)	$	(1	)	$	(45	)
2008			3			(12		)	(7		)	—			(7		)	9			1			(3		)	(16		)
2009						(4		)	2			—			(13		)	(3		)	(9		)	(9		)	(36		)
2010									(3		)	(6		)	(6		)	(8		)	(7		)	(6		)	(36		)
2011												1			(7		)	(20		)	(10		)	(7		)	(43		)
2012															7			(14		)	(7		)	(1		)	(15		)
2013																		1			(7		)	(19		)	(25		)
2014																					15			—			15
2015																								15			15

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

(2) The amounts included in the loss reserve development tables above are presented at the year-end 2016 foreign currency exchange rates for all periods presented to remove the effects of foreign currency exchange rate fluctuations between calendar years. The amounts included within the table on page 102 presenting the detail of the development recorded within the International segment include the impact of fluctuations in foreign currency exchange rates.

International - Hardy

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31								Calendar Year										As of December 31, 2016
(In millions, except reported claims data)	Net Claim and Allocated Claim Adjustment Expense Reserves at Acquisition		Net Incurred Claim and Allocated Claim Adjustment Expenses in 2012(1)(2)			Total Acquired Net Claim and Allocated Claim Adjustment Expense Reserves and 2012 Incurreds		2013(1)		2014(1)			2015(1)		2016			IBNR			Cumulative Number of Claims
Accident Year
2007	$	5	$	7		$	12	$	11	$	16		$	10	$	15		$	—		4,249
2008	18		(4		)	14		11		12			13		13			—			4,234
2009	11		1			12		6		(4		)	1		(2		)	—			3,840
2010	46		(10		)	36		46		50			44		50			—			4,495
2011	121		—			121		130		130			134		132			(2		)	6,193
2012	33		69			102		102		110			117		110			(1		)	6,758
2013								127		144			136		137			—			7,392
2014										182			180		174			7			7,656
2015													187		176			18			7,669
2016															225			101			5,274
													Total		$	1,030		$	123

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2012(1)(2)		2013(1)			2014(1)			2015(1)			2016
Accident Year
2007	$	3	$	14		$	14		$	14		$	14
2008	3		14			10			10			11
2009	1		(2		)	(4		)	(4		)	(4		)
2010	19		34			41			43			45
2011	29		80			119			123			127
2012	14		78			98			107			104
2013			37			100			119			125
2014						55			121			139
2015									29			97
2016												62
Total												$	720
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented												$	310
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007												3
Liability for unallocated claim adjustment expenses for accident years presented												7
Total net liability for unpaid claim and claim adjustment expenses												$	320

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2012(1)(2)			2013(1)			2014(1)			2015(1)			2016			Total (3)
Accident Year
2007	$	7		$	(1	)	$	5		$	(6	)	$	5		$	10
2008	(4		)	(3		)	1			1			—			(5		)
2009	1			(6		)	(10		)	5			(3		)	(13		)
2010	(10		)	10			4			(6		)	6			4
2011	—			9			—			4			(2		)	11
2012				—			8			7			(7		)	8
2013							17			(8		)	1			10
2014										(2		)	(6		)	(8		)
2015													(11		)	(11		)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

(2) Data presented for this calendar year is post-acquisition of Hardy.

(3) The amounts included in the loss reserve development tables above are presented at the year-end 2016 foreign currency exchange rates for all periods presented to remove the effects of foreign currency exchange rate fluctuations between calendar years. The amounts included within the table on page 102 presenting the detail of the development recorded within the International segment include the impact of fluctuations in foreign currency exchange rates.

The table below reconciles the net liability for unpaid claim and claim adjustment expenses for the property and casualty segments to the amount presented in the Consolidated Balance Sheets.

As of December 31
(In millions)	2016
Net liability for unpaid claim and claim adjustment expenses
Specialty	$	5,404
Commercial	8,305
International	1,201
Corporate & Other Non-Core	230
Life & Group Non-Core (1)	3,109
Total net claim and claim adjustment expenses	18,249
Reinsurance receivables (2)
Specialty	745
Commercial	589
International	127
Corporate & Other Non-Core	2,384
Life & Group Non-Core	249
Total reinsurance receivables	4,094
Total gross liability for unpaid claim and claim adjustment expenses	$	22,343

(1) The Life & Group Non-Core segment amount is primarily related to long term care claim reserves, but does include amounts related to unfunded structured settlements arising from short duration contracts. Long term care policies are long duration contracts.

(2) Reinsurance receivables presented do not include reinsurance receivables related to paid losses.

The table below presents information about average historical claims duration as of December 31, 2016 and is presented as required supplementary information, which is unaudited.

Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses in Year:
	1		2		3		4		5		6		7		8		9		10		Total
Specialty
Medical Professional Liability	3.1	%	18.2	%	22.3	%	19.6	%	12.7	%	8.0	%	5.0	%	4.8	%	3.7	%	0.3	%	97.7	%
Other Professional Liability and Management Liability	5.7	%	20.6	%	21.0	%	17.0	%	10.0	%	6.3	%	5.6	%	3.8	%	1.9	%	3.2	%	95.1	%
Surety(1)	23.4	%	32.8	%	20.2	%	8.9	%	3.7	%	1.5	%	(0.7	)%	2.0	%	1.0	%	2.0	%	94.8	%
Commercial
Commercial Auto	27.2	%	23.1	%	18.3	%	13.9	%	9.1	%	3.9	%	1.3	%	0.2	%	0.3	%	0.3	%	97.6	%
General Liability	5.0	%	16.3	%	20.5	%	20.1	%	15.3	%	8.0	%	4.2	%	2.7	%	1.1	%	1.3	%	94.5	%
Workers' Compensation	13.5	%	21.4	%	14.6	%	10.5	%	7.5	%	5.7	%	4.6	%	3.0	%	2.1	%	0.3	%	83.2	%
International
International - Excluding Hardy	19.5	%	27.4	%	12.1	%	6.8	%	5.9	%	4.5	%	4.8	%	3.7	%	5.0	%	1.3	%	91.0	%
International - Hardy (2)	25.7	%	40.9	%	12.1	%	4.4	%													83.1	%

(1) Due to the nature of the Surety business, average annual percentage payout of ultimate net incurred claim and allocated claim adjustment expenses has been calculated using only the payouts of mature accident years presented in the loss reserve development tables.

(2) Average historical claims duration for Hardy is presented prospectively beginning with the first full year subsequent to acquisition, 2013.

A&EP Reserves

In 2010, Continental Casualty Company (CCC) together with several of the Company’s insurance subsidiaries completed a transaction with National Indemnity Company (NICO), a subsidiary of Berkshire Hathaway Inc., under which substantially all of the Company’s legacy A&EP liabilities were ceded to NICO through a Loss Portfolio Transfer (LPT). At the effective date of the transaction, the Company ceded approximately $1.6 billion of net A&EP claim and allocated claim adjustment expense reserves to NICO under a retroactive reinsurance agreement with an aggregate limit of $4 billion. The $1.6 billion of claim and allocated claim adjustment expense reserves ceded to NICO was net of $1.2 billion of ceded claim and allocated claim adjustment expense reserves under existing third-party reinsurance contracts. The NICO LPT aggregate reinsurance limit also covers credit risk on the existing third-party reinsurance related to these liabilities. The Company paid NICO a reinsurance premium of $2 billion and transferred to NICO billed third-party reinsurance receivables related to A&EP claims with a net book value of $215 million, resulting in total consideration of $2.2 billion.

Subsequent to the effective date of the LPT, the Company recognized adverse prior year development on its A&EP reserves which resulted in additional amounts ceded under the LPT. As a result, the cumulative amounts ceded under the LPT exceeded the $2.2 billion consideration paid, resulting in the NICO LPT moving into a gain position, requiring retroactive reinsurance accounting. Under retroactive reinsurance accounting, this gain is deferred and only recognized in earnings in proportion to actual paid recoveries under the LPT. Over the life of the contract, there is no economic impact as long as any additional losses incurred are within the limit of the LPT. In a period in which the Company recognizes a change in the estimate of A&EP reserves that increases the amounts ceded under the LPT, the proportion of actual paid recoveries to total ceded losses is impacted and the change in the deferred gain is recognized in earnings as if the revised estimate of ceded losses was available at the effective date of the LPT. The effect of the deferred retroactive reinsurance benefit is recorded in Insurance claims and policyholders' benefits in the Consolidated Statement of Operations.

The following table presents the impact of the Loss Portfolio Transfer on the Consolidated Statements of Operations.

Years ended December 31
(In millions)	2016			2015			2014
Net A&EP adverse development before consideration of LPT	$	200		$	150		$	—
Retroactive reinsurance benefit recognized	(107		)	(85		)	(13		)
Pretax impact of A&EP reserve development and the LPT	$	93		$	65		$	(13	)

Based upon the Company's 2016 A&EP reserve review, net unfavorable prior year development of $200 million was recognized before consideration of cessions to the LPT. The unfavorable development was driven by an increase in anticipated future expenses associated with determination of coverage, higher anticipated payouts associated with a limited number of historical accounts having significant asbestos exposures and higher than expected severity on pollution claims. An A&EP reserve review was not completed in 2014 because additional information and analysis on inuring third-party reinsurance recoveries were needed to finalize the review. The review was finalized in the second quarter of 2015 and management has adopted the first quarter of the year as the timing for all future annual A&EP claims actuarial reviews, subject to the timing of the corresponding review performed by NICO. Unfavorable development of $150 million was recorded in 2015 to reflect a decrease in anticipated future reinsurance recoveries related to asbestos claims and higher than expected severity on pollution claims. While this unfavorable development was ceded to NICO in 2016 and 2015 under the LPT, the Company’s Net income in both periods was negatively affected due to the application of retroactive reinsurance accounting.

As of December 31, 2016 and 2015, the cumulative amounts ceded under the LPT were $2.8 billion and $2.6 billion. The unrecognized deferred retroactive reinsurance benefit was $334 million and $241 million as of December 31, 2016 and 2015.

NICO established a collateral trust account as security for its obligations to the Company. The fair value of the collateral trust account was $2.8 billion as of December 31, 2016 and 2015. In addition, Berkshire Hathaway Inc. guaranteed the payment obligations of NICO up to the aggregate reinsurance limit as well as certain of NICO’s performance obligations under the trust agreement. NICO is responsible for claims handling and billing and collection from third-party reinsurers related to the Company’s A&EP claims.

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Legal Proceedings, Commitments and Contingencies, and Guarantees

12 Months Ended

Dec. 31, 2016

Legal Proceedings, Commitments and Contingencies, and Guarantees [Abstract]

Legal Proceedings, Commitments and Contingencies, and Guarantees [Text Block]

Note F. Legal Proceedings, Commitments and Contingencies, and Guarantees

CNA 401(k) Plus Plan Litigation

In September 2016, a class action lawsuit was filed against CCC, Continental Assurance Company (CAC), CNAF, the Investment Committee of the CNA 401(k) Plus Plan, The Northern Trust Company and John Does 1-10 (collectively Defendants) over the CNA 401(k) Plus Plan. The complaint alleges that defendants breached fiduciary duties to the CNA 401(k) Plus Plan and caused prohibited transactions in violation of the Employee Retirement Income Security Act of 1974 when the CNA 401(k) Plus Plan's Fixed Income Fund’s annuity contract with CAC was canceled. The plaintiff alleges he and a proposed class of the CNA 401(k) Plus Plan participants who had invested in the Fixed Income Fund suffered lower returns in their CNA 401(k) Plus Plan investments as a consequence of these alleged violations and seeks relief on behalf of the putative class. Management has only recently begun evaluating the lawsuit as this litigation is in its preliminary stages, and as of yet no class has been certified. CCC and the other defendants are contesting the case and management currently is unable to predict the final outcome or the impact on the Company’s financial condition, results of operations, or cash flows. As of December 31, 2016, the likelihood of loss is reasonably possible, but the amount of loss, if any, cannot be estimated at this stage of the litigation.

Small Business Premium Rate Adjustment Contingency

The Company recently identified rating errors related to its multi-peril package product within its Small Business unit.  The Company recorded a charge which reduced Earned premium by $16 million in anticipation of voluntarily issuing $30 million of premium refunds related to affected policies written from December 1, 2015 through December 31, 2016.  Earned premium in 2017 will be negatively impacted by the portion of the $30 million that has not yet been earned through December 31, 2016 and the expected refund amount will increase further because of premium written in 2017 prior to the Company’s actions to correct its rating process. The Company is currently in dialogue with state regulators and providing them with details regarding the anticipated premium refunds and other corrective actions.  The Company is reviewing other business lines to determine whether other similar issues exist. Fines or penalties related to the foregoing or further refunds which may be required are reasonably possible, but the amount of such losses, if any, cannot be estimated at this time.

Other Litigation

The Company is a party to other routine litigation incidental to its business, which, based on the facts and circumstances currently known, is not material to the Consolidated Financial Statements.

Commitments and Contingencies

The Company holds an investment in a real estate joint venture in which the Company, on a joint and several basis with the other unrelated shareholders, guaranteed to fund operating deficits of the joint venture and an operating lease for an office building entered into by the venture. The lease was terminated in March 2016. In the event that the other parties to the joint venture are unable to meet their commitments in funding this joint venture, the Company would be required to assume future obligations, primarily related to the wind-down of the lease and joint venture. The Company does not believe it is likely that it will be required to do so. However, as of December 31, 2016, the maximum potential loss that the Company could be required to pay under this guarantee, in excess of amounts already recorded, was approximately $11 million. If the Company were required to assume future obligations, the Company would have the right to pursue reimbursement from the other shareholders.

Guarantees

As of December 31, 2016 and December 31, 2015, the Company had recorded liabilities of approximately $5 million related to guarantee and indemnification agreements. Management believes that it is not likely that any future indemnity claims will be significantly greater than the amounts recorded.

In the course of selling business entities and assets to third parties, the Company agreed to guarantee the performance of certain obligations of a previously owned subsidiary and to indemnify purchasers for losses arising out of breaches of representation and warranties with respect to the business entities or assets sold, including, in certain cases, losses arising from undisclosed liabilities or certain named litigation. Such guarantee and indemnification agreements in effect for sales of business entities, assets and third-party loans may include provisions that survive indefinitely. As of December 31, 2016, the aggregate amount related to quantifiable guarantees was $375 million and the aggregate amount related to quantifiable indemnification agreements was $258 million. Should the Company be required to make payments under the guarantee, it would have the right to seek reimbursement in certain cases from an affiliate of a previously owned subsidiary.

In addition, the Company has agreed to provide indemnification to third-party purchasers for certain losses associated with sold business entities or assets that are not limited by a contractual monetary amount. As of December 31, 2016, the Company had outstanding unlimited indemnifications in connection with the sales of certain of its business entities or assets that included tax liabilities arising prior to a purchaser's ownership of an entity or asset, defects in title at the time of sale, employee claims arising prior to closing and in some cases losses arising from certain litigation and undisclosed liabilities. Certain provisions of the indemnification agreements survive indefinitely, while others survive until the applicable statutes of limitation expire, or until the agreed-upon contract terms expire.

The Company also provided guarantees, if the primary obligor fails to perform, to holders of structured settlement annuities provided by a previously owned subsidiary. As of December 31, 2016, the potential amount of future payments the Company could be required to pay under these guarantees was approximately $1.9 billion, which will be paid over the lifetime of the annuitants. The Company does not believe any payment is likely under these guarantees, as the Company is the beneficiary of a trust that must be maintained at a level that approximates the discounted reserves for these annuities.

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Reinsurance

12 Months Ended

Dec. 31, 2016

Reinsurance Disclosures [Abstract]

Reinsurance

Note G. Reinsurance

The Company cedes insurance to reinsurers to limit its maximum loss, provide greater diversification of risk, minimize exposures on larger risks and to exit certain lines of business. The ceding of insurance does not discharge the primary liability of the Company. A credit exposure exists with respect to reinsurance ceded to the extent that any reinsurer is unable to meet its obligations. A collectibility exposure also exists to the extent that the reinsurer disputes the liabilities assumed under reinsurance agreements. Property and casualty reinsurance coverages are tailored to the specific risk characteristics of each product line and the Company's retained amount varies by type of coverage. Reinsurance contracts are purchased to protect specific lines of business such as property and workers' compensation. Corporate catastrophe reinsurance is also purchased for property and workers' compensation exposure. Currently, most reinsurance contracts are purchased on an excess of loss basis. The Company also utilizes facultative reinsurance in certain lines. In addition, the Company assumes reinsurance, primarily through Hardy and as a member of various reinsurance pools and associations.

The following table presents the amounts receivable from reinsurers.

December 31
(In millions)	2016			2015
Reinsurance receivables related to insurance reserves:
Ceded claim and claim adjustment expenses	$	4,094		$	4,087
Ceded future policy benefits	212			207
Reinsurance receivables related to paid losses	147			197
Reinsurance receivables	4,453			4,491
Allowance for uncollectible reinsurance	(37		)	(38		)
Reinsurance receivables, net of allowance for uncollectible reinsurance	$	4,416		$	4,453

The Company has established an allowance for uncollectible reinsurance receivables related to credit risk. The Company reviews the allowance quarterly and adjusts the allowance as necessary to reflect changes in estimates of uncollectible balances. The allowance may also be reduced by write-offs of reinsurance receivable balances.

The Company attempts to mitigate its credit risk related to reinsurance by entering into reinsurance arrangements with reinsurers that have credit ratings above certain levels and by obtaining collateral. On a limited basis, the Company may enter into reinsurance agreements with reinsurers that are not rated, primarily captive reinsurers. The primary methods of obtaining collateral are through reinsurance trusts, letters of credit and funds withheld balances. Such collateral was approximately $3.0 billion and $3.2 billion as of December 31, 2016 and 2015.

The Company's largest recoverables from a single reinsurer including ceded unearned premium reserves, as of December 31, 2016, were approximately $2,353 million from a subsidiary of Berkshire Hathaway Group, $350 million from the Gateway Rivers Insurance Company and $212 million from subsidiaries of Wilton Re. These amounts are substantially collateralized. The recoverable from the Berkshire Hathaway Group includes amounts related to third-party reinsurance for which NICO has assumed the credit risk under the terms of the Loss Portfolio Transfer as discussed in Note E to the Consolidated Financial Statements.

The effects of reinsurance on earned premiums and written premiums are presented in the following tables.

(In millions)	Direct		Assumed		Ceded		Net		Assumed/ Net %
2016 Earned Premiums
Property and casualty	$	10,400	$	258	$	4,270	$	6,388	4.0	%
Long term care	486		50		—		536		9.3	%
Total earned premiums	$	10,886	$	308	$	4,270	$	6,924	4.4	%
2015 Earned Premiums
Property and casualty	$	9,853	$	274	$	3,754	$	6,373	4.3	%
Long term care	498		50		—		548		9.1	%
Total earned premiums	$	10,351	$	324	$	3,754	$	6,921	4.7	%
2014 Earned Premiums
Property and casualty	$	9,452	$	277	$	3,073	$	6,656	4.2	%
Long term care	508		48		—		556		8.6	%
Total earned premiums	$	9,960	$	325	$	3,073	$	7,212	4.5	%

(In millions)	Direct		Assumed		Ceded		Net		Assumed/ Net %
2016 Written Premiums
Property and casualty	$	10,451	$	245	$	4,255	$	6,441	3.8	%
Long term care	495		52		—		547		9.5	%
Total written premiums	$	10,946	$	297	$	4,255	$	6,988	4.3	%
2015 Written Premiums
Property and casualty	$	9,852	$	270	$	3,702	$	6,420	4.2	%
Long term care	493		49		—		542		9.0	%
Total written premiums	$	10,345	$	319	$	3,702	$	6,962	4.6	%
2014 Written Premiums
Property and casualty	$	9,283	$	276	$	3,024	$	6,535	4.2	%
Long term care	504		49		—		553		8.9	%
Total written premiums	$	9,787	$	325	$	3,024	$	7,088	4.6	%

Included in the direct and ceded earned premiums for the years ended December 31, 2016, 2015 and 2014 are $3,865 million, $3,344 million and $2,643 million related to property business that is 100% reinsured under a significant third-party captive program. The third-party captives that participate in this program are affiliated with the non-insurance company policyholders, therefore this program provides a means for the policyholders to self-insure this property risk. The Company receives and retains a ceding commission.

Long term care premiums are from long duration contracts; property and casualty premiums are from short duration contracts.

Insurance claims and policyholders' benefits reported on the Consolidated Statements of Operations are net of reinsurance recoveries of $3,016 million, $2,601 million and $1,379 million for the years ended December 31, 2016, 2015 and 2014, including $2,621 million, $2,282 million and $1,458 million, respectively, related to the significant third-party captive program discussed above. Reinsurance recoveries in 2014 were unfavorably affected by the commutation of a workers’ compensation reinsurance pool.

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Debt

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Debt Disclosure [Text Block]

Note H. Debt

Debt is composed of the following obligations.

December 31
(In millions)	2016		2015
Short term debt:
Senior notes of CNAF, 6.500%, face amount of $350, due August 15, 2016	$	—	$	350
Long term debt:
Senior notes of CNAF:
6.950%, face amount of $150, due January 15, 2018	150		150
7.350%, face amount of $350, due November 15, 2019	349		349
5.875%, face amount of $500, due August 15, 2020	498		497
5.750%, face amount of $400, due August 15, 2021	398		397
3.950%, face amount of $550, due May 15, 2024	546		546
4.500%, face amount of $500, due March 1, 2026	498		—
Debenture of CNAF, 7.250%, face amount of $243, due November 15, 2023	241		241
Subordinated variable rate debt of Hardy, face amount of $30, due September 15, 2036	30		30
Total long term debt	2,710		2,210
Total debt	$	2,710	$	2,560

CCC is a member of the FHLBC. FHLBC membership provides participants with access to additional sources of liquidity through various programs and services. As a requirement of membership in the FHLBC, CCC held $5 million of FHLBC stock as of December 31, 2016 giving it access to approximately $111 million of additional liquidity. As of December 31, 2016 and 2015, CCC had no outstanding borrowings from the FHLBC.

During 2015, the Company entered into a five-year $250 million senior unsecured revolving credit facility with a syndicate of banks which may be used for general corporate purposes. At the Company's election, the commitments under the credit agreement may be increased from time to time up to an additional aggregate amount of $100 million and the credit agreement includes two optional one-year extensions prior to the first and second anniversary of the closing date, subject to applicable consents. Under the credit agreement, the Company is required to pay a facility fee which would adjust automatically in the event of a change in the Company's financial ratings. The credit agreement includes several covenants, including maintenance of a minimum consolidated net worth and a defined ratio of consolidated indebtedness to consolidated total capitalization. The minimum consolidated net worth, as defined as of December 31, 2016, was $8.7 billion. As of December 31, 2016 and 2015, the Company had no outstanding borrowings under the credit agreements.

The Company's debt obligations contain customary covenants for investment grade issuers. The Company was in compliance with all covenants as of and for the years ended December 31, 2016 and 2015.

The combined aggregate maturities for debt as of December 31, 2016 are presented in the following table.

(In millions)
2017	$	—
2018	150
2019	350
2020	500
2021	400
Thereafter	1,323
Less discount	(13		)
Total	$	2,710

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Benefit Plans

12 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Benefit Plans

Note I. Benefit Plans

Pension and Postretirement Health Care Benefit Plans

CNA sponsors noncontributory defined benefit pension plans, primarily through the CNA Retirement Plan, covering certain eligible employees. These plans were closed to new entrants. CNA's funding policy for defined benefit pension plans is to make contributions in accordance with applicable governmental regulatory requirements with consideration of the funded status of the plans.

Effective January 1, 2000, the CNA Retirement Plan was closed to new participants. Existing participants at that time were given a choice to either continue to accrue benefits under the CNA Retirement Plan or to cease accruals effective December 31, 1999. Employees who chose to continue to accrue benefits under the plan received benefits in accordance with plan provisions through June 30, 2015 as discussed further below. Employees who elected to cease accruals effective December 31, 1999 received the present value of their accrued benefit in an accrued pension account that is credited with interest based on the annual rate of interest on 30-year Treasury securities. These employees also receive certain enhanced employer contributions in the CNA 401(k) Plus Plan.

In 2016, the CNA Retirement Plan paid $88 million to settle its obligation to certain retirees through the purchase of a group annuity contract from a third party insurance company. This transaction reduced the plan’s projected benefit obligation by $86 million.

In the second quarter of 2015, the Company eliminated future benefit accruals associated with the CNA Retirement Plan effective June 30, 2015.  Employees who were continuing to accrue under the CNA Retirement Plan up until that date are entitled to an accrued benefit payable based on their eligible compensation and accrued service through June 30, 2015, in accordance with the terms of the CNA Retirement Plan. Starting with the first pay period after July 1, 2015, affected employees began receiving enhanced employer contributions in the CNA 401(k) Plus Plan similar to employees who elected to cease accruals effective December 31, 1999. Employees who elected to cease accruals effective December 31, 1999 are not affected by this curtailment. This curtailment resulted in a $55 million decrease in the CNA Retirement Plan benefit obligation liability and a reduction of the unrecognized actuarial losses included in AOCI. In connection with the curtailment, the Company remeasured the plan benefit obligation which resulted in an increase in the discount rate used to determine the benefit obligation from 3.85% to 4.00%.

During 2014, the CNA Retirement Plan offered a limited-time lump sum settlement payment opportunity to the majority of the terminated vested participants of the plan. The lump sum settlements reduced the Company’s risk and volatility related to funding the CNA Retirement Plan. The number of participants that elected to accept the lump sum opportunity was approximately 20% of the then total participants in the plan. Settlement payments of $253 million were made from CNA Retirement Plan assets. The $84 million settlement charge recorded by the Company in the fourth quarter of 2014 represents recognition of a portion of the unrecognized actuarial losses previously reflected in AOCI. This settlement charge is included in Other operating expenses within the Corporate & Other Non-Core segment.

CNA provides certain health care benefits to eligible retired employees, their covered dependents and their beneficiaries primarily through the CNA Health and Group Benefits Program. These postretirement benefits have largely been eliminated for active employees.

In the second quarter of 2014, the Company eliminated certain postretirement medical benefits associated with the CNA Health and Group Benefits Program. This change was a negative plan amendment which resulted in an $86 million curtailment gain reported in Other operating expenses within the Corporate & Other Non-Core segment. In connection with the plan amendment, the Company remeasured the plan benefit obligation which resulted in a decrease in the discount rate used to determine the benefit obligation from 3.60% to 3.10%.

The following table presents a reconciliation of benefit obligations and plan assets.

	Pension Benefits						Postretirement Benefits
(In millions)	2016			2015			2016			2015
Benefit obligation as of January 1	$	2,821		$	3,019		$	23		$	29
Changes in benefit obligation:
Service cost	—			4			—			—
Interest cost	113			112			—			1
Participants' contributions	—			—			4			4
Plan amendments	—			(55		)	—			—
Actuarial (gain) loss	68			(79		)	(6		)	(3		)
Benefits paid	(173		)	(173		)	(7		)	(8		)
Foreign currency translation and other	(14		)	(7		)	1			—
Settlement through group annuity purchase	(86		)	—			—			—
Benefit obligation as of December 31	2,729			2,821			15			23
Fair value of plan assets as of January 1	2,267			2,456			—			—
Change in plan assets:
Actual return on plan assets	193			(18		)	—			—
Company contributions	9			10			3			4
Participants' contributions	—			—			4			4
Benefits paid	(173		)	(173		)	(7		)	(8		)
Foreign currency translation and other	(15		)	(8		)	—			—
Settlement through group annuity purchase	(88		)	—			—			—
Fair value of plan assets as of December 31	2,193			2,267			—			—
Funded status	$	(536	)	$	(554	)	$	(15	)	$	(23	)
Amounts recognized on the Consolidated Balance Sheets as of December 31:
Other assets	$	4		$	12		$	—		$	—
Other liabilities	(540		)	(566		)	(15		)	(23		)
Net amount recognized	$	(536	)	$	(554	)	$	(15	)	$	(23	)
Amounts recognized in Accumulated other comprehensive income, not yet recognized in net periodic cost (benefit):
Prior service credit	$	—		$	—		$	(4	)	$	(6	)
Net actuarial loss	999			999			(3		)	3
Net amount recognized	$	999		$	999		$	(7	)	$	(3	)

The accumulated benefit obligation for all defined benefit pension plans was $2,729 million and $2,821 million as of December 31, 2016 and 2015.

The components of net periodic cost (benefit) are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Pension cost (benefit)
Service cost	$	—		$	4		$	9
Interest cost on projected benefit obligation	113			112			132
Expected return on plan assets	(160		)	(174		)	(191		)
Amortization of net actuarial loss	37			34			25
Settlement loss	—			—			84
Net periodic pension cost (benefit)	$	(10	)	$	(24	)	$	59
Postretirement cost (benefit)
Interest cost on projected benefit obligation	$	—		$	1		$	1
Amortization of prior service credit	(2		)	(3		)	(10		)
Amortization of net actuarial loss	—			1			1
Curtailment gain	—			—			(86		)
Net periodic postretirement cost (benefit)	$	(2	)	$	(1	)	$	(94	)

The amounts recognized in Other comprehensive income are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Pension and postretirement benefits
Amounts arising during the period	$	(29	)	$	(111	)	$	(337	)
Curtailment and other	—			56			(81		)
Settlement	—			—			84
Reclassification adjustment relating to prior service credit	(2		)	(3		)	(10		)
Reclassification adjustment relating to actuarial loss	37			35			26
Settlement through group annuity purchase	(2		)	—			—
Total increase (decrease) in Other comprehensive income	$	4		$	(23	)	$	(318	)

The table below presents the estimated amounts to be recognized from AOCI into net periodic cost (benefit) during 2017.

(In millions)	Pension Benefits		Postretirement Benefits
Amortization of prior service credit	$	—	$	(2	)
Amortization of net actuarial loss	36		—
Total estimated amounts to be recognized	$	36	$	(2	)

Actuarial assumptions used for the CNA Retirement Plan and CNA Health and Group Benefits Program to determine benefit obligations are presented in the following table.

December 31	2016		2015
Pension benefits
Discount rate	3.950	%	4.150	%
Expected long term rate of return	7.500		7.500
Postretirement benefits
Discount rate	2.750	%	2.750	%

Actuarial assumptions used for the CNA Retirement Plan and CNA Health and Group Benefits Program to determine net cost or benefit are presented in the following table.

Years ended December 31	2016		2015		2014
Pension benefits
Discount rate	4.150	%	3.850%/4.000%		4.650	%
Expected long term rate of return	7.500		7.500		7.500
Rate of compensation increases	N/A		3.920		3.990
Postretirement benefits
Discount rate	2.750	%	2.500	%	3.600%/3.100%

In determining the expected long term rate of return on plan assets assumption for the CNA Retirement Plan, CNA considered the historical performance of the benefit plan investment portfolio as well as long term market return expectations based on the investment mix of the portfolio and the expected investment horizon.

The CNA Health and Group Benefits Program has limited its share of the health care trend rate to a cost-of-living adjustment of 4% per year. For all participants, the employer subsidy on health care costs will not increase by more than 4% per year. As a result, the assumed health care cost trend rate used in measuring the accumulated postretirement benefit obligation for the CNA Health and Group Benefits Program was 4% per year in 2016, 2015 and 2014.

CNA employs a total return approach whereby a mix of equity, limited partnerships and fixed maturity securities are used to maximize the long term return of retirement plan assets for a prudent level of risk and to manage cash flows according to plan requirements. The target allocation of plan assets is 40% to 60% invested in equity securities and limited partnerships, with the remainder primarily invested in fixed maturity securities. Alternative investments, including limited partnerships, are used to enhance risk adjusted long term returns while improving portfolio diversification. The intent of this strategy is to minimize the Company's expense related to funding the plan by generating investment returns that exceed the growth of the plan liabilities over the long run. Risk tolerance is established after careful consideration of the plan liabilities, plan funded status and corporate financial conditions.

As of December 31, 2016, the plan had committed approximately $113 million to future capital calls from various third-party limited partnership investments in exchange for an ownership interest in the related partnerships. Derivatives may be used to gain market exposure in an efficient and timely manner. Investment risk is measured and monitored on an ongoing basis through annual liability measurements, periodic asset/liability studies and quarterly investment portfolio reviews.

Pension plan assets measured at fair value on a recurring basis as well as cash are presented in the following tables.

December 31, 2016
(In millions)	Level 1		Level 2		Level 3		Total
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	500	$	10	$	510
States, municipalities and political subdivisions	—		63		—		63
Asset-backed:
Residential mortgage-backed	—		109		—		109
Commercial mortgage-backed	—		66		—		66
Other asset-backed	—		4		—		4
Total asset-backed	—		179		—		179
Total fixed maturity securities	—		742		10		752
Equity securities	363		105		—		468
Derivative financial instruments	—		—		—		—
Short term investments	11		35		—		46
Other assets	—		37		—		37
Cash	14		—		—		14
Total assets measured at fair value	$	388	$	919	$	10	1,317
Total limited partnerships measured at net asset value (1)							876
Total plan assets							$	2,193

December 31, 2015
(In millions)	Level 1		Level 2		Level 3		Total Assets
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	455	$	10	$	465
States, municipalities and political subdivisions	—		106		—		106
Asset-backed:
Residential mortgage-backed	—		133		—		133
Commercial mortgage-backed	—		69		—		69
Other asset-backed	—		11		—		11
Total asset-backed	—		213		—		213
Total fixed maturity securities	—		774		10		784
Equity securities	336		107		—		443
Derivative financial instruments	1		—		—		1
Short term investments	24		28		—		52
Other assets	—		52		—		52
Total assets measured at fair value	$	361	$	961	$	10	1,332
Total limited partnerships measured at net asset value (1)							935
Total plan assets							$	2,267

(1) In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.

The limited partnership investments held within the plan are recorded at fair value, which represents the plan's share of net asset value of each partnership, as determined by the general partner. Limited partnerships comprising 86% and 87% of the carrying value as of December 31, 2016 and 2015 employ hedge fund strategies that generate returns through investing in marketable securities in the public fixed income and equity markets and the remainder were primarily invested in private debt and equity. Within hedge fund strategies, approximately 57% were equity related, 38% pursued a multi-strategy approach and 5% were focused on distressed investments as of December 31, 2016.

For a discussion of the fair value levels and the valuation methodologies used to measure fixed maturity securities, equities, derivatives and short term investments, see Note C to the Consolidated Financial Statements.

The tables below present a reconciliation for all pension plan assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

Level 3 (In millions)	Balance as of January 1, 2016		Actual return on assets still held as of December 31, 2016		Actual return on assets sold during the year ended December 31, 2016		Purchases, sales and settlements		Net transfers into (out of) Level 3		Balance as of December 31, 2016
Fixed maturity securities:
Corporate and other bonds	$	10	$	—	$	—	$	—	$	—	$	10
Total	$	10	$	—	$	—	$	—	$	—	$	10

Level 3 (In millions)	Balance as of January 1, 2015		Actual return on assets still held as of December 31, 2015		Actual return on assets sold during the year ended December 31, 2015		Purchases, sales and settlements		Net transfers into (out of) Level 3			Balance as of December 31, 2015
Fixed maturity securities:
Corporate and other bonds	$	15	$	—	$	—	$	—	$	(5	)	$	10
Total	$	15	$	—	$	—	$	—	$	(5	)	$	10

The table below presents the estimated future minimum benefit payments to participants as of December 31, 2016.

(In millions)	Pension Benefits		Postretirement Benefits
2017	$	178	$	3
2018	178		2
2019	177		2
2020	178		2
2021	178		2
2022-2026	883		3

In 2017, CNA expects to contribute $12 million to its pension plans and $3 million to its postretirement health care benefit plans.

Savings Plans

CNA sponsors savings plans, which are generally contributory plans that allow most employees to contribute a maximum of 50% of their eligible compensation, subject to certain limitations prescribed by the IRS. The Company contributes matching amounts to participants, amounting to 70% of the first 6% (35% of the first 6% in the first year of employment) of eligible compensation contributed by the employee. Matching contributions vest ratably over participants first five years of service.

Eligible employees also receive a Company contribution of 3% or 5% of their eligible compensation, depending on their age. In addition, these employees are eligible to receive additional discretionary contributions of up to 2% of eligible compensation and an additional Company match of up to 80% of the first 6% of eligible compensation contributed by the employee. These additional contributions are made at the discretion of management and are contributed to participant accounts in the first quarter of the year following management's determination of the discretionary amounts. Matching contributions vest ratably over participants first five years of service.

Benefit expense for the Company's savings plans was $75 million, $71 million and $69 million for the years ended December 31, 2016, 2015 and 2014.

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Stock-Based Compensation

12 Months Ended

Dec. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation [Text Block]

Note J. Stock-Based Compensation

The CNAF Incentive Compensation Plan (the Plan), as amended and restated on January 1, 2010, as amended, authorizes the grant of stock-based compensation to certain management personnel for up to 11 million shares of CNAF's common stock. The Plan currently provides for awards of stock options, stock appreciation rights (SARs), restricted shares, restricted stock units (RSUs), performance-based RSUs and performance share units. The number of shares available for the granting of stock-based compensation under the Plan as of December 31, 2016 was approximately 3.7 million.

The Company recorded stock-based compensation expense related to the Plan of $36 million, $14 million and $11 million for the years ended December 31, 2016, 2015 and 2014. The related income tax benefit recognized was $12 million, $5 million and $4 million for the years ended December 31, 2016, 2015, and 2014. The compensation cost related to non-vested awards not yet recognized was $32 million, and the weighted average period over which it is expected to be recognized is 1.9 years as of December 31, 2016.

Equity based compensation that is not fully vested prior to termination is generally forfeited upon termination, except in cases of retirement, death or disability, and as otherwise provided by contractual obligations.

Share Awards

The fair value of share awards is based on the market value of the Company's common stock as of the date of grant. Share awards currently granted under the Plan include RSUs, performance-based RSUs and performance share units. Generally, RSU's vest over a two or three year service period following the date of grant. Performance-based RSUs generally become payable within a range of 0% to 100% of the number of shares initially granted based upon the attainment of specific annual performance goals and vest ratably over a four-year service period following the date of grant.

In 2016, CNA adopted the Annual Performance Share Plan (PSP). The PSP provides officers with an opportunity to earn an award based upon attainment of specific performance goals achieved over a one-year performance period. Awards are granted at the beginning of each performance year and are subject to a two-year cliff vesting period after the Company’s annual performance has been determined. Prior to the PSP, CNA issued performance share units under the Long Term Incentive Plan (LTI). The LTI Plan has a three year performance period and will continue to have outstanding awards through 2017. In both plans, the performance share units become payable within a range of 0% to 200% of the number of performance share units initially granted.

In 2016, CNA granted Special Supplemental Equity Awards (SSE). The awards consist of restricted stock units subject to both Company performance in 2016 and service-based vesting up to two years. Payments made under the PSP and SSE are made entirely in shares of common stock, except for awards made to non-U.S. participants, which are paid in cash.

The following table presents activity for non-vested RSUs, performance-based RSUs and performance share units under the Plan in 2016.

	Number of Awards		Weighted-Average Grant Date Fair Value
Balance as of January 1, 2016	735,263		$	36.53
Awards granted	2,545,624		32.27
Awards vested	(371,443	)	33.33
Awards forfeited, canceled or expired	(186,932	)	32.80
Performance-based adjustment	(590,730	)	33.10
Balance as of December 31, 2016	2,131,782		$	33.28

SARs

The exercise price of all SARs granted is based on the market value of the Company's common stock as of the date of grant. SARs generally vest ratably over a four-year service period following date of grant and have a maximum term of ten years.

The fair value of granted SARs was estimated at the grant date using the Black-Scholes option-pricing model. The Black-Scholes model incorporates a risk free rate of return and various assumptions regarding the underlying common stock and the expected life of the securities granted. Different interest rates and assumptions were used for each grant, as appropriate based on date of grant.

There were no SARs granted for the years ended December 31, 2016 and 2015. As of December 31, 2016, there were approximately 1 million awards outstanding, fully vested or expected to vest and be exercisable. The grant date fair value of SARs vested was $1 million for the year ended December 31, 2014.

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Other Intangible Assets

12 Months Ended

Dec. 31, 2016

Intangible Assets, Gross (Excluding Goodwill) [Abstract]

Other Intangible Assets

Note K. Other Intangible Assets

Other intangible assets are presented in the following table.

December 31		2016				2015
(In millions)	Economic Useful Life	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Value of business acquired	1 - 4 years	$	48	$	48	$	57	$	57
Trade name	8 years	6		3		7		3
Distribution channel	15 years	10		3		12		3
Total finite-lived intangible assets		64		54		76		63
Indefinite-lived intangible assets:
Syndicate capacity		43				52
Agency force		16				16
Total indefinite-lived intangible assets		59				68
Total other intangible assets		$	123	$	54	$	144	$	63

The Company's other intangible assets primarily relate to the purchase of Hardy, and the amortization of these intangible assets is included in the Statement of Operations for the International segment. For the year ended December 31, 2014 amortization expense of $2 million was included in Amortization of deferred acquisition costs. For the years ended December 31, 2016, 2015 and 2014 amortization expense of $1 million was included in Other operating expenses. The gross carrying amounts and accumulated amortization in the table above may change from period to period as a result of foreign currency translation. Estimated future amortization expense for other intangible assets is $1 million annually in 2017 through 2021.

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Operating Leases [Text Block]

12 Months Ended

Dec. 31, 2016

Leases, Operating [Abstract]

Operating Leases [Text Block]

Note L. Operating Leases

The Company occupies office facilities under lease agreements that expire at various dates. In addition, data processing, office and transportation equipment is leased under agreements that expire at various dates. Most leases contain renewal options that provide for rent increases based on prevailing market conditions. Lease expenses for the years ended December 31, 2016, 2015 and 2014 were $60 million, $46 million and $55 million. Sublease revenue for the year ended December 31, 2014 was $1 million.

The table below presents the expected future minimum lease payments to be made under non-cancelable operating leases as of December 31, 2016.

(In millions)	Future Minimum Lease Payments
2017	$	48
2018	37
2019	30
2020	33
2021	34
Thereafter	244
Total	$	426

In connection with the planned relocation of the Company's global headquarters, on March 24, 2016, the Company sold the building in which it maintains the current principal executive offices of CNAF. Concurrently, the Company agreed to lease back the current office space until the relocation of the global headquarters under a separate lease agreement, which is expected to occur in 2018. The sale-leaseback agreement includes expected future minimum lease payments of $10 million in 2017 and $4 million in 2018.

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Stockholders' Equity and Statutory Accounting Practices

12 Months Ended

Dec. 31, 2016

Stockholders' Equity and Statutory Accounting Practices [Abstract]

Stockholders' Equity And Statutory Accounting Practices

Note M. Stockholders’ Equity and Statutory Accounting Practices

Common Stock Dividends

There are no restrictions on the retained earnings or net income of CNAF with regard to payment of dividends to its stockholders. However, given the holding company nature of CNAF, its ability to pay a dividend is significantly dependent on the receipt of dividends from its subsidiaries, particularly CCC, which directly or indirectly owns all significant subsidiaries. See the Statutory Accounting Practices section below for a discussion of the regulatory restrictions on CCC's availability to pay dividends.

CNAF's ability to pay dividends is indirectly limited by the minimum consolidated net worth covenant in the Company's line of credit agreement. See Note H to the Consolidated Financial Statements for further discussion of the Company's debt obligations.

Statutory Accounting Practices

CNAF’s insurance subsidiaries are domiciled in various jurisdictions. These subsidiaries prepare statutory financial statements in accordance with accounting practices prescribed or permitted by the respective jurisdictions’ insurance regulators. Domestic prescribed statutory accounting practices are set forth in a variety of publications of the National Association of Insurance Commissioners (NAIC) as well as state laws, regulations and general administrative rules. These statutory accounting principles vary in certain respects from GAAP. In converting from statutory accounting principles to GAAP, the more significant adjustments include deferral of policy acquisition costs and the inclusion of net unrealized holding gains or losses in stockholders’ equity relating to certain fixed maturity securities.

The Company has a prescribed practice as it relates to the accounting under Statement of Statutory Accounting Principles No. 62R (SSAP No. 62R), Property and Casualty Reinsurance, paragraphs 67 and 68 in conjunction with the 2010 Loss Portfolio Transfer with NICO which is further discussed in Note E.  The prescribed practice allows the Company to aggregate all third party AE&P reinsurance balances administered by NICO in Schedule F and to utilize the Loss Portfolio Transfer as collateral for the underlying third party reinsurance balances for purposes of calculating the statutory reinsurance penalty. This prescribed practice increased statutory capital and surplus by $67 million and $90 million at December 31, 2016 and 2015.

The 2015 long term care premium deficiency discussed in Note A was recorded on a GAAP basis. There was no premium deficiency for statutory accounting purposes. Statutory accounting principles requires the use of prescribed discount rates in calculating the reserves for long term care future policy benefits which are lower than the discount rates used on a GAAP basis and results in higher carried reserves relative to GAAP reserves.

The payment of dividends by CNAF's insurance subsidiaries without prior approval of the insurance department of each subsidiary’s domiciliary jurisdiction is generally limited by formula. Dividends in excess of these amounts are subject to prior approval by the respective insurance regulator.

Dividends from CCC are subject to the insurance holding company laws of the State of Illinois, the domiciliary state of CCC. Under these laws, ordinary dividends, or dividends that do not require prior approval by the Illinois Department of Insurance (the Department), are determined based on the greater of the prior year's statutory net income or 10% of statutory surplus as of the end of the prior year, as well as timing and amount of dividends paid in the preceding twelve months. Additionally, ordinary dividends may only be paid from earned surplus, which is calculated by removing unrealized gains from unassigned surplus. As of December 31, 2016, CCC is in a positive earned surplus position. The maximum allowable dividend CCC could pay during 2017 that would not be subject to the Department’s prior approval is $1,075 million, less dividends paid during the preceding twelve months measured at that point in time. CCC paid dividends of $765 million in 2016. The actual level of dividends paid in any year is determined after an assessment of available dividend capacity, holding company liquidity and cash needs as well as the impact the dividends will have on the statutory surplus of the applicable insurance company.

Combined statutory capital and surplus and statutory net income (loss), determined in accordance with accounting practices prescribed or permitted by insurance and/or other regulatory authorities for the Combined Continental Casualty Companies, are presented in the table below.

	Statutory Capital and Surplus				Statutory Net Income (Loss)
	December 31				Years ended December 31
(In millions)	2016 (1)		2015		2016 (1)		2015		2014
Combined Continental Casualty Companies	$	10,748	$	10,723	$	1,033	$	1,148	$	914

(1) Information derived from the statutory-basis financial statements to be filed with insurance regulators.

CNAF’s domestic insurance subsidiaries are subject to risk-based capital (RBC) requirements. RBC is a method developed by the NAIC to determine the minimum amount of statutory capital appropriate for an insurance company to support its overall business operations in consideration of its size and risk profile. The formula for determining the amount of RBC specifies various factors, weighted based on the perceived degree of risk, which are applied to certain financial balances and financial activity. The adequacy of a company's actual capital is evaluated by a comparison to the RBC results, as determined by the formula. Companies below minimum RBC requirements are classified within certain levels, each of which requires specified corrective action.

The statutory capital and surplus presented above for CCC was approximately 270% and 266% of company action level RBC as of December 31, 2016 and 2015. Company action level RBC is the level of RBC which triggers a heightened level of regulatory supervision. The statutory capital and surplus of the Company's foreign insurance subsidiaries, which is not significant to the overall statutory capital and surplus, also met or exceeded their respective regulatory and other capital requirements.

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Accumulated Other Comprehensive Income (Loss) by Component

12 Months Ended

Dec. 31, 2016

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss) by Component

Note N. Accumulated Other Comprehensive Income (Loss) by Component

The table below displays the changes in Accumulated other comprehensive income (loss) by component.

(In millions)	Net unrealized gains (losses) on investments with OTTI losses		Net unrealized gains (losses) on other investments		Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of December 31, 2015	$	27	$	390	$	(648	)	$	(84	)	$	(315	)
Other comprehensive income (loss) before reclassifications	9		290		(22		)	(114		)	163
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $(3), $(16), $12, $- and $(7)	6		38		(23		)	—			21
Other comprehensive income (loss) net of tax (expense) benefit of $(1), $(117), $(3), $- and $(121)	3		252		1			(114		)	142
Balance as of December 31, 2016	$	30	$	642	$	(647	)	$	(198	)	$	(173	)

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments			Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of December 31, 2014	$	36		$	942		$	(633	)	$	55		$	400
Other comprehensive income (loss) before reclassifications	(23		)	(595		)	(36		)	(139		)	(793		)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $8, $30, $11, $- and $49	(14		)	(43		)	(21		)	—			(78		)
Other comprehensive income (loss) net of tax (expense) benefit of $5, $282, $8, $- and $295	(9		)	(552		)	(15		)	(139		)	(715		)
Balance as of December 31, 2015	$	27		$	390		$	(648	)	$	(84	)	$	(315	)

Amounts reclassified from Accumulated other comprehensive income (loss) shown above are reported in Net income (loss) as follows:

Component of AOCI	Consolidated Statements of Operations Line Item Affected by Reclassifications
Net unrealized gains (losses) on investments with OTTI losses	Net realized investment gains (losses)
Net unrealized gains (losses) on other investments	Net realized investment gains (losses)
Pension and postretirement benefits	Other operating expenses

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Business Segments

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Business Segments

Note O. Business Segments

The Company's core property and casualty commercial insurance operations are managed and reported in three business segments: Specialty, Commercial and International. Specialty provides a broad array of professional, financial and specialty property and casualty products and services through a network of independent agents, brokers and managing general underwriters. Commercial includes property and casualty coverages sold to small businesses and middle market entities and organizations primarily through an independent agency distribution system. Commercial also includes commercial insurance and risk management products sold to large corporations primarily through insurance brokers. International provides management and professional liability coverages as well as a broad range of other property and casualty insurance products and services abroad through a network of brokers, independent agencies and managing general underwriters, as well as the Lloyd’s of London marketplace.

The Company's non-core operations are managed and reported in two segments: Life & Group Non-Core and Corporate & Other Non-Core. Life & Group Non-Core primarily includes the results of our individual and group long term care businesses that are in run-off. Corporate & Other Non-Core primarily includes certain corporate expenses, including interest on corporate debt, and the results of certain property and casualty business in run-off, including CNA Re and A&EP.

The accounting policies of the segments are the same as those described in Note A to the Consolidated Financial Statements. The Company manages most of its assets on a legal entity basis, while segment operations are generally conducted across legal entities. As such, only Insurance and Reinsurance receivables, Insurance reserves, Deferred acquisition costs and Goodwill are readily identifiable for all individual segments. Distinct investment portfolios are not maintained for every individual segment; accordingly, allocation of assets to each segment is not performed. Therefore, a significant portion of Net investment income and Realized investment gains or losses are allocated primarily based on each segment's net carried insurance reserves, as adjusted. All significant intersegment income and expense has been eliminated. Income taxes have been allocated on the basis of the taxable income of the segments.

Approximately 7.9%, 8.0% and 8.8% of the Company's direct written premiums were derived from outside the United States for the years ended December 31, 2016, 2015 and 2014.

In the following tables, certain financial measures are presented to provide information used by management to monitor the Company's operating performance. Management utilizes these financial measures to monitor the Company's insurance operations and investment portfolio. Net operating income (loss), which is derived from certain income statement amounts, is used by management to monitor performance of the Company's insurance operations. The Company's investment portfolio is monitored by management through analysis of various factors including unrealized gains and losses on securities, portfolio duration and exposure to market and credit risk. Based on such analyses, the Company may recognize an OTTI loss on an investment security in accordance with its policy, or sell a security, which may produce realized gains and losses.

Net operating income (loss) is calculated by excluding from net income (loss) the after-tax effects of i) net realized investment gains (losses) ii) income or loss from discontinued operations and iii) any cumulative effects of changes in accounting guidance. The calculation of net operating income excludes net realized investment gains (losses) because net realized investment gains (losses) are largely discretionary, except for some losses related to OTTI, and are generally driven by economic factors that are not necessarily consistent with key drivers of underwriting performance, and are therefore not considered an indication of trends in insurance operations.

The Company's results of continuing operations and selected balance sheet items by segment are presented in the following tables.

Year ended December 31, 2016	Specialty			Commercial			International			Life & Group Non-Core			Corporate & Other Non-Core
(In millions)																Eliminations			Total
Net written premiums	$	2,780		$	2,841		$	821		$	547		$	—		$	(1	)	$	6,988
Operating revenues
Net earned premiums	$	2,779		$	2,804		$	806		$	536		$	—		$	(1	)	$	6,924
Net investment income	516			638			51			767			16			—			1,988
Other revenues	362			32			—			(2		)	12			—			404
Total operating revenues	3,657			3,474			857			1,301			28			(1		)	9,316
Claims, Benefits and Expenses
Net incurred claims and benefits	1,467			1,927			492			1,286			98			—			5,270
Policyholders’ dividends	4			9			—			—			—			—			13
Amortization of deferred acquisition costs	591			470			174			—			—			—			1,235
Other insurance related expenses	301			560			133			132			(3		)	(1		)	1,122
Other expenses	312			36			24			8			209			—			589
Total claims, benefits and expenses	2,675			3,002			823			1,426			304			(1		)	8,229
Operating income (loss) before income tax	982			472			34			(125		)	(276		)	—			1,087
Income tax (expense) benefit on operating income (loss)	(332		)	(161		)	(13		)	145			98			—			(263		)
Net operating income (loss)	650			311			21			20			(178		)	—			824
Net realized investment gains (losses)	5			4			18			25			(2		)	—			50
Income tax (expense) benefit on net realized investment gains (losses)	(2		)	(2		)	(3		)	(9		)	1			—			(15		)
Net realized investment gains (losses), after tax	3			2			15			16			(1		)	—			35
Net income (loss) from continuing operations	$	653		$	313		$	36		$	36		$	(179	)	$	—		$	859

December 31, 2016
(In millions)
Reinsurance receivables	$	760	$	621	$	131	$	462	$	2,479	$	—	$	4,453
Insurance receivables	982		1,021		233		17		2		—		2,255
Deferred acquisition costs	310		214		76		—		—		—		600
Goodwill	117		—		28		—		—		—		145
Insurance reserves
Claim and claim adjustment expenses	6,149		8,894		1,328		3,358		2,614		—		22,343
Unearned premiums	1,911		1,323		396		132		—		—		3,762
Future policy benefits	—		—		—		10,326		—		—		10,326

Year ended December 31, 2015	Specialty			Commercial			International			Life & Group Non-Core			Corporate & Other Non-Core
(In millions)																Eliminations			Total
Net written premiums	$	2,781		$	2,818		$	822		$	542		$	1		$	(2	)	$	6,962
Operating revenues
Net earned premiums	$	2,782		$	2,788		$	804		$	548		$	1		$	(2	)	$	6,921
Net investment income	474			593			52			704			17			—			1,840
Other revenues	356			37			(1		)	7			11			(3		)	407
Total operating revenues	3,612			3,418			855			1,259			29			(5		)	9,168
Claims, Benefits and Expenses
Net incurred claims and benefits	1,597			1,814			479			1,421			61			—			5,372
Policyholders’ dividends	4			8			—			—			—			—			12
Amortization of deferred acquisition costs	589			469			168			314			—			—			1,540
Other insurance related expenses	278			538			138			142			(1		)	(2		)	1,093
Other expenses	301			28			12			11			186			(3		)	535
Total claims, benefits and expenses	2,769			2,857			797			1,888			246			(5		)	8,552
Operating income (loss) before income tax	843			561			58			(629		)	(217		)	—			616
Income tax (expense) benefit on operating income (loss)	(283		)	(192		)	(21		)	315			80			—			(101		)
Net operating income (loss)	560			369			37			(314		)	(137		)	—			515
Net realized investment gains (losses)	(33		)	(47		)	1			(1		)	13			—			(67		)
Income tax (expense) benefit on net realized investment gains (losses)	11			16			—			9			(5		)	—			31
Net realized investment gains (losses), after tax	(22		)	(31		)	1			8			8			—			(36		)
Net income (loss) from continuing operations	$	538		$	338		$	38		$	(306	)	$	(129	)	$	—		$	479

December 31, 2015
(In millions)
Reinsurance receivables	$	724	$	639	$	144	$	497	$	2,487	$	—	$	4,491
Insurance receivables	890		993		233		11		2		—		2,129
Deferred acquisition costs	307		213		78		—		—		—		598
Goodwill	117		—		33		—		—		—		150
Insurance reserves
Claim and claim adjustment expenses	6,269		9,183		1,347		3,220		2,644		—		22,663
Unearned premiums	1,839		1,297		415		120		—		—		3,671
Future policy benefits	—		—		—		10,152		—		—		10,152

Year ended December 31, 2014	Specialty			Commercial						Life & Group Non-Core			Corporate & Other Non-Core
(In millions)							International									Eliminations			Total
Net written premiums	$	2,839		$	2,817		$	880		$	553		$	1		$	(2	)	$	7,088
Operating revenues
Net earned premiums	$	2,838		$	2,906		$	913		$	556		$	1		$	(2	)	$	7,212
Net investment income	560			723			61			700			23			—			2,067
Other revenues	295			38			—			16			12			(5		)	356
Total operating revenues	3,693			3,667			974			1,272			36			(7		)	9,635
Claims, Benefits and Expenses
Net incurred claims and benefits	1,627			2,187			488			1,304			(29		)	—			5,577
Policyholders’ dividends	6			8			—			—			—			—			14
Amortization of deferred acquisition costs	592			493			204			28			—			—			1,317
Other insurance related expenses	262			487			151			130			1			(2		)	1,029
Other expenses	254			31			28			30			210			(5		)	548
Total claims, benefits and expenses	2,741			3,206			871			1,492			182			(7		)	8,485
Operating income (loss) before income tax	952			461			103			(220		)	(146		)	—			1,150
Income tax (expense) benefit on operating income (loss)	(318		)	(154		)	(34		)	151			54			—			(301		)
Net operating income (loss)	634			307			69			(69		)	(92		)	—			849
Net realized investment gains (losses)	15			16			(1		)	7			20			—			57
Income tax (expense) benefit on net realized investment gains (losses)	(5		)	(6		)	1			—			(8		)	—			(18		)
Net realized investment gains (losses), after tax	10			10			—			7			12			—			39
Net income (loss) from continuing operations	$	644		$	317		$	69		$	(62	)	$	(80	)	$	—		$	888

The following table presents revenue by line of business for each reportable segment. Revenues are comprised of operating revenues and net realized investment gains and losses.

Years ended December 31
(In millions)	2016			2015			2014
Specialty
Management & Professional Liability	$	2,620		$	2,617		$	2,818
Surety	532			502			509
Warranty & Alternative Risks	510			460			381
Specialty revenues	3,662			3,579			3,708
Commercial
Middle Market	1,769			1,623			1,631
Small Business	583			616			709
Other Commercial Insurance	1,126			1,132			1,343
Commercial revenues	3,478			3,371			3,683
International
Canada	203			214			273
CNA Europe	319			309			335
Hardy	353			333			365
International revenues	875			856			973
Life & Group Non-Core revenues	1,326			1,258			1,279
Corporate & Other Non-Core revenues	26			42			56
Eliminations	(1		)	(5		)	(7		)
Total revenues	$	9,366		$	9,101		$	9,692

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Discontinued Operations

12 Months Ended

Dec. 31, 2016

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

Note P. Discontinued Operations

The results of discontinued operations reflected in the Consolidated Statements of Operations were as follows:

Year ended December 31
(In millions)	2014
Revenues
Net earned premiums	$	—
Net investment income	94
Net realized investment gains	3
Other revenues	—
Total revenues	97
Claims, Benefits and Expenses
Insurance claims and policyholders' benefits	75
Other operating expenses	2
Total claims, benefits and expenses	77
Income before income tax	20
Income tax expense	(6		)
Income from operations of discontinued operations, net of income tax	14
Loss on sale, net of income tax benefit of $40	(211		)
Loss from discontinued operations	$	(197	)

The disposal group included $3,550 million of assets and $3,297 million of liabilities as of August 1, 2014.

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Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Data [Abstract]

Quarterly Financial Data (Unaudited)

Note Q. Quarterly Financial Data (Unaudited)

The following tables present unaudited quarterly financial data.

2016
(In millions, except per share data)	First		Second		Third		Fourth		Full Year
Revenues	$	2,195	$	2,348	$	2,433	$	2,390	$	9,366
Net income (loss) (1)	$	66	$	209	$	343	$	241	$	859
Basic earnings (loss) per share	$	0.25	$	0.77	$	1.27	$	0.89	$	3.18
Diluted earnings (loss) per share	$	0.24	$	0.77	$	1.26	$	0.89	$	3.17

2015
(In millions, except per share data)	First		Second		Third		Fourth			Full Year
Revenues	$	2,352	$	2,327	$	2,153	$	2,269		$	9,101
Net income (loss) (1) (2)	$	233	$	138	$	178	$	(70	)	$	479
Basic earnings (loss) per share	$	0.86	$	0.51	$	0.66	$	(0.26	)	$	1.77
Diluted earnings (loss) per share	$	0.86	$	0.51	$	0.66	$	(0.26	)	$	1.77

(1) Net income (loss) in the first quarter of 2016 and the second quarter of 2015 included a charge related to the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer in our Corporate & Other Non-Core segment.

(2) Net income (loss) in the fourth quarter of 2015 included a charge related to recognition of a premium deficiency in our long term care business.

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Related Party Transactions

12 Months Ended

Dec. 31, 2016

Related Party Transactions [Abstract]

Related Party Transactions

Note R. Related Party Transactions

The Company reimburses Loews for, or pays directly, fees and expenses of investment facilities and services provided to the Company. The amounts incurred by the Company for these fees and expenses were $43 million, $39 million and $39 million for the years ended December 31, 2016, 2015 and 2014 and amounts due to Loews, included in Other liabilities and payable in the first quarter of the subsequent year, were $23 million and $21 million as of December 31, 2016 and 2015. In addition, the Company reimbursed Loews for general corporate services and related travel expenses of $1 million for the year ended December 31, 2016. The CNA Tax Group is included in the consolidated federal income tax return of Loews and its eligible subsidiaries, and the related payable to Loews, included in Other liabilities, was $28 million and $61 million as of December 31, 2016 and 2015. For a detailed description of the income tax agreement with Loews see Note D to the Consolidated Financial Statements. In addition, the Company writes, at standard rates, a limited amount of insurance for Loews and its subsidiaries. The earned premiums for the years ended December 31, 2016, 2015 and 2014 were $2 million.

CNA previously sponsored a stock ownership plan whereby the Company financed the purchase of Company common stock by certain former officers, including executive officers. Interest charged on the principal amount of these outstanding stock purchase loans is generally equivalent to the short term applicable federal rate in effect on the disbursement date of the loan, compounded semi-annually. Loans made pursuant to the plan were full recourse and secured by the stock purchased.

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Organization Review

12 Months Ended

Dec. 31, 2016

Restructuring and Related Activities [Abstract]

Restructuring and Related Activities Disclosure [Text Block]

Note S. Organization Review

In 2016, the Company completed a comprehensive organization review intended to improve effectiveness and efficiency. The review resulted in the elimination of approximately 370 positions. The Company incurred employee termination costs as a result of these actions totaling approximately $19 million during the year ended December 31, 2016. The costs incurred to date are included in Total claims, benefits, and expenses on the consolidated Statements of Operations and have been allocated to the Company's reportable segments in a manner consistent with the Company's current allocation of personnel costs. The costs by reportable segment for the year ended December 31, 2016, are presented in the following table.

Year ended December 31
(In millions)	2016
Specialty	$	4
Commercial	14
International	—
Life & Group Non-Core	1
Corporate & Other Non-Core	—
Total organization review costs	$	19

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Schedule I. Summary of Investments - Other Than Investments in Related Parties

12 Months Ended

Dec. 31, 2016

Summary of Investments, Other than Investments in Related Parties [Abstract]

Schedule I. Summary of Investments - Other than Investments in Related Parties

SCHEDULE I. SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES

Incorporated herein by reference to Note B to the Consolidated Financial Statements included under Item 8.

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Schedule II. Condensed Financial Information of Registrant (Parent Company)

12 Months Ended

Dec. 31, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Schedule II. Condensed Financial Information of Registrant (Parent Company)

SCHEDULE II. CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY)

CNA Financial Corporation

Statements of Operations and Comprehensive Income (Loss)

Years ended December 31
(In millions)	2016			2015			2014
Revenues
Net investment income	$	3		$	1		$	1
Net realized investment (losses) gains	(7		)	5			4
Total revenues	(4		)	6			5
Expenses
Administrative and general	1			1			5
Interest	155			154			182
Total expenses	156			155			187
Loss from operations before income taxes and equity in net income of subsidiaries	(160		)	(149		)	(182		)
Income tax benefit	41			34			35
Loss before equity in net income of subsidiaries	(119		)	(115		)	(147		)
Equity in net income of subsidiaries	978			594			838
Net income	859			479			691
Equity in other comprehensive income of subsidiaries	142			(715		)	(42		)
Total Comprehensive Income (Loss)	$	1,001		$	(236	)	$	649

See accompanying Notes to Condensed Financial Information as well as the

Consolidated Financial Statements and accompanying Notes.

CNA Financial Corporation

Balance Sheets

December 31
(In millions, except share data)	2016			2015
Assets
Investment in subsidiaries	$	14,202		$	13,851
Cash	1			4
Short term investments	487			478
Amounts due from affiliates	6			—
Other assets	1			1
Total assets	$	14,697		$	14,334
Liabilities
Short term debt	$	—		$	350
Long term debt	2,680			2,180
Other liabilities	48			48
Total liabilities	2,728			2,578
Stockholders' Equity
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,495,998 and 270,274,361 shares outstanding)	683			683
Additional paid-in capital	2,173			2,153
Retained earnings	9,359			9,313
Accumulated other comprehensive income	(173		)	(315		)
Treasury stock (2,544,245 and 2,765,882 shares), at cost	(73		)	(78		)
Total stockholders' equity	11,969			11,756
Total liabilities and stockholders' equity	$	14,697		$	14,334

See accompanying Notes to Condensed Financial Information as well as the

Consolidated Financial Statements and accompanying Notes.

CNA Financial Corporation

Statements of Cash Flows

Years ended December 31
(In millions)	2016			2015			2014
Cash Flows from Operating Activities
Net income	$	859		$	479		$	691
Adjustments to reconcile net income to net cash flows provided by operating activities:
Equity in net income of subsidiaries	(978		)	(594		)	(838		)
Dividends received from subsidiaries	765			900			650
Net realized investment losses (gains)	7			(5		)	(4		)
Other, net	21			4			14
Total adjustments	(185		)	305			(178		)
Net cash flows provided by operating activities	674			784			513
Cash Flows from Investing Activities
Change in short term investments	(9		)	21			6
Capital contributions to subsidiaries	—			—			(10		)
Other, net	4			7			5
Net cash flows (used) provided by investing activities	(5		)	28			1
Cash Flows from Financing Activities
Dividends paid to common stockholders	(813		)	(811		)	(541		)
Proceeds from the issuance of debt	498			—			546
Repayment of debt	(358		)	—			(549		)
Stock options exercised	—			1			5
Other, net	1			1			25
Net cash flows used by financing activities	(672		)	(809		)	(514		)
Net change in cash	(3		)	3			—
Cash, beginning of year	4			1			1
Cash, end of year	$	1		$	4		$	1

See accompanying Notes to Condensed Financial Information as well as the

Consolidated Financial Statements and accompanying Notes.

Notes to Condensed Financial Information

A. Summary of Significant Accounting Policies

Basis of Presentation

The condensed financial information of CNA Financial Corporation (CNAF or the Parent Company) should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in Item 8 of this Form 10-K. CNAF’s subsidiaries are accounted for using the equity method of accounting. Equity in net income of these subsidiaries is presented on the Condensed Statements of Operations as Equity in net income of subsidiaries. Loews owned approximately 90% of the outstanding common stock of CNAF as of December 31, 2016.

Recently Adopted Accounting Standards Updates (ASU)

In April 2015, the Financial Accounting Standards Board (FASB) issued ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The updated accounting guidance requires debt issuance costs to be presented as a deduction from the corresponding debt liability instead of the historical presentation as an unamortized debt issuance asset. As of January 1, 2016, the Parent Company adopted the updated accounting guidance retrospectively. The Parent Company adjusted its previously reported financial information included herein to reflect the change in accounting guidance for debt issuance costs. The impacts of adopting the new accounting standard on the Parent Company’s Consolidated Balance Sheet as of December 31, 2015, were a decrease in Other assets and a decrease in Long term debt of $2 million.

B. Commitments, Contingencies and Guarantees

As of December 31, 2016 and 2015 CNAF had recorded liabilities of approximately $5 million related to guarantee agreements. The Parent Company believes that it is not likely that any future indemnity claims will be significantly greater than the amounts recorded.

In the course of selling business entities and assets to third parties, CNAF has agreed to guarantee the performance of certain obligations of both a previously owned subsidiary and a current subsidiary. Such obligations include agreement to indemnify purchasers for losses arising out of breaches of representation and warranties with respect to the business entities or assets sold, including, in certain cases, losses arising from undisclosed liabilities or certain named litigation. The guarantee agreements may include provisions that survive indefinitely. As of December 31, 2016, the aggregate amount of quantifiable guarantee agreements in effect for sales of business entities, assets and third-party loans was $625 million. Should the company be required to make payments under the guarantee, it would have the right to seek reimbursement in certain cases from an affiliate of a previously owned subsidiary.

In addition, CNAF has agreed to provide indemnification to third-party purchasers for certain losses associated with sold business entities or assets that are not limited by a contractual monetary amount. As of December 31, 2016, CNAF had outstanding unlimited indemnifications in connection with the sales of certain of its business entities or assets that included tax liabilities arising prior to a purchaser’s ownership of an entity or asset, defects in title at the time of sale, employee claims arising prior to closing and in some cases losses arising from certain litigation and undisclosed liabilities. These indemnification agreements survive until the applicable statutes of limitation expire or until the agreed upon contract terms expire.

CNAF also provided guarantees, if the primary obligor fails to perform, to holders of structured settlement annuities provided by a previously owned subsidiary. As of December 31, 2016, the potential amount of future payments CNAF could be required to pay under these guarantees was approximately $1.9 billion, which will be paid over the lifetime of the annuitants. The Parent Company does not believe a payable is likely under these guarantees, as it is the beneficiary of a trust that must be maintained at a level that approximates the discounted reserves for these annuities.

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Schedule III. Supplementary Insurance Information

12 Months Ended

Dec. 31, 2016

Supplementary Insurance Information [Abstract]

Schedule III. Supplementary Insurance Information

SCHEDULE III. SUPPLEMENTARY INSURANCE INFORMATION

Incorporated herein by reference to Note O to the Consolidated Financial Statements included under Item 8.

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Schedule IV. Reinsurance

12 Months Ended

Dec. 31, 2016

Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]

Schedule IV. Reinsurance

SCHEDULE IV. REINSURANCE

Incorporated herein by reference to Note G to the Consolidated Financial Statements included under Item 8.

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Schedule V. Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2016

Valuation and Qualifying Accounts [Abstract]

Schedule V. Valuation and Qualifying Accounts

SCHEDULE V. VALUATION AND QUALIFYING ACCOUNTS

(In millions)	Balance at Beginning of Period		Charged to Costs and Expenses			Charged to Other Accounts (1)			Deductions			Balance at End of Period
Year ended December 31, 2016
Deducted from assets:
Allowance for doubtful accounts:
Insurance and reinsurance receivables	$	89	$	(2	)	$	(1	)	$	(3	)	$	83
Year ended December 31, 2015
Deducted from assets:
Allowance for doubtful accounts:
Insurance and reinsurance receivables	$	109	$	(12	)	$	—		$	(8	)	$	89
Year ended December 31, 2014
Deducted from assets:
Allowance for doubtful accounts:
Insurance and reinsurance receivables	$	155	$	(40	)	$	(1	)	$	(5	)	$	109

(1)    Amount includes effects of foreign currency translation.

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Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations

12 Months Ended

Dec. 31, 2016

Supplemental Information for Property, Casualty Insurance Underwriters [Abstract]

Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations

SCHEDULE VI. SUPPLEMENTAL INFORMATION CONCERNING PROPERTY AND CASUALTY INSURANCE OPERATIONS

As of and for the years ended December 31	Consolidated Property and Casualty Operations
(In millions)	2016			2015			2014
Balance Sheet Data
Deferred acquisition costs	$	599		$	597
Reserves for unpaid claim and claim adjustment expenses	22,343			22,663
Discount deducted from claim and claim adjustment expense reserves above (based on interest rates ranging from 3.5% to 8.0%)	1,572			1,534
Unearned premiums	3,762			3,671
Statement of Operations Data
Net written premiums	$	6,988		$	6,962		$	7,088
Net earned premiums	6,924			6,921			7,212
Net investment income	1,952			1,807			2,031
Incurred claim and claim adjustment expenses related to current year	5,025			4,934			5,043
Incurred claim and claim adjustment expenses related to prior years	(342		)	(255		)	(39		)
Amortization of deferred acquisition costs	1,235			1,540			1,317
Paid claim and claim adjustment expenses	5,134			4,945			5,297

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Consolidation

The accompanying Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). Intercompany amounts have been eliminated.

Use of Estimates

The preparation of Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

Premiums

Premiums: Insurance premiums on property and casualty insurance contracts are recognized in proportion to the underlying risk insured and are principally earned ratably over the duration of the policies. Premiums on long term care contracts are earned ratably over the policy year in which they are due. The reserve for unearned premiums represents the portion of premiums written relating to the unexpired terms of coverage.

Insurance receivables include balances due currently or in the future, including amounts due from insureds related to losses under high deductible policies, and are presented at unpaid balances, net of an allowance for uncollectible receivables. Amounts are considered past due based on policy payment terms. The allowance is determined based on periodic evaluations of aged receivables, management's experience and current economic conditions. Insurance receivables and any related allowance are written off after collection efforts are exhausted or a negotiated settlement is reached.

Property and casualty contracts that are retrospectively rated contain provisions that result in an adjustment to the initial policy premium depending on the contract provisions and loss experience of the insured during the experience period. For such contracts, the Company estimates the amount of ultimate premiums that the Company may earn upon completion of the experience period and recognizes either an asset or a liability for the difference between the initial policy premium and the estimated ultimate premium. The Company adjusts such estimated ultimate premium amounts during the course of the experience period based on actual results to date. The resulting adjustment is recorded as either a reduction of or an increase to the earned premiums for the period.

Claim and claim adjustment expense reserves

Claim and claim adjustment expense reserves: Claim and claim adjustment expense reserves, except reserves for structured settlements not associated with asbestos and environmental pollution (A&EP), workers' compensation lifetime claims and long term care claims, are not discounted and are based on 1) case basis estimates for losses reported on direct business, adjusted in the aggregate for ultimate loss expectations; 2) estimates of incurred but not reported (IBNR) losses; 3) estimates of losses on assumed reinsurance; 4) estimates of future expenses to be incurred in the settlement of claims; 5) estimates of salvage and subrogation recoveries and 6) estimates of amounts due from insureds related to losses under high deductible policies. Management considers current conditions and trends as well as past Company and industry experience in establishing these estimates. The effects of inflation, which can be significant, are implicitly considered in the reserving process and are part of the recorded reserve balance. Ceded claim and claim adjustment expense reserves are reported as a component of Reinsurance receivables on the Consolidated Balance Sheets.

Claim and claim adjustment expense reserves are presented net of anticipated amounts due from insureds related to losses under deductible policies of $1.2 billion and $1.2 billion as of December 31, 2016 and 2015. A significant portion of these amounts are supported by collateral. The Company has an allowance for uncollectible deductible amounts, which is presented as a component of the allowance for doubtful accounts included in Insurance receivables onthe Consolidated Balance Sheets.

Structured settlements have been negotiated for certain property and casualty insurance claims. Structured settlements are agreements to provide fixed periodic payments to claimants. The Company's obligations for structured settlements not funded by annuities are included in claim and claim adjustment expense reserves and carried at present values determined using interest rates ranging from to 5.5% to 8.0% as of December 31, 2016 and 2015. As of December 31, 2016 and 2015, the discounted reserves for unfunded structured settlements were $544 million and $560 million, net of discount of $841 million and $880 million. For the years ended December 31, 2016, 2015 and 2014, the amount of interest recognized on the discounted reserves of unfunded structured settlements was $42 million, $42 million and $43 million, respectively. This interest accretion is presented as a component of Insurance claims and policyholders’ benefits on the Consolidated Statements of Operations, but is excluded from the Company’s disclosure of prior year development.

Workers' compensation lifetime claim reserves are calculated using mortality assumptions determined through statutory regulation and economic factors. At December 31, 2016 and 2015, workers' compensation lifetime claim reserves are discounted at a 3.5% interest rate. As of December 31, 2016 and 2015, the discounted reserves for workers’ compensation lifetime claim reserves were $371 million and $396 million, net of discount of $202 million and $218 million. For the years ended December 31, 2016, 2015 and 2014 the amount of interest accretion recognized on the discounted reserves of workers’ compensation lifetime claim reserves was $17 million, $20 million and $22 million, respectively.

Long term care claim reserves are calculated using mortality and morbidity assumptions based on Company and industry experience. Long term care claim reserves are discounted at interest rates ranging from 4.5% to 6.8% as of December 31, 2016 and 2015. As of December 31, 2016 and 2015, such discounted reserves totaled $2.2 billion and $2.2 billion, net of discount of $529 million and $435 million.

Future policy benefits reserves

Future policy benefits reserves: Future policy benefits reserves represent the active life reserves related to the Company's long term care policies and are computed using the net level premium method, which incorporates actuarial assumptions as to morbidity, persistency, discount rate and expenses. Expense assumptions primarily relate to claim adjudication. Actuarial assumptions generally vary by plan, age at issue, policy duration and gender. The initial assumptions are determined at issuance, include a margin for adverse deviation and are locked in throughout the life of the contract unless a premium deficiency develops. If a premium deficiency emerges, the assumptions are unlocked and deferred acquisition costs, if any, and the future policy benefits reserves are adjusted. The December 31, 2015 gross premium valuation (GPV) indicated a premium deficiency of $296 million. The indicated premium deficiency necessitated a charge to income that was affected by the write off of the entire long term care deferred acquisition cost asset of $289 million and an increase to active life reserves of $7 million. As a result, the long term care active life reserves carried as of December 31, 2015 represent management’s best estimate assumptions at that date with no margin for adverse deviation. The December 31, 2016 GPV indicated the carried reserves were sufficient, therefore there was no unlocking of assumptions. Interest rates for long term care active life reserves range from 6.6% to 7.0% as of December 31, 2016 and 2015.

Guaranty fund and other insurance-related assessments

Guaranty fund and other insurance-related assessments: Liabilities for guaranty fund and other insurance-related assessments are accrued when an assessment is probable, when it can be reasonably estimated and when the event obligating the entity to pay an imposed or probable assessment has occurred. Liabilities for guaranty funds and other insurance-related assessments are not discounted and are included as part of Other liabilities on the Consolidated Balance Sheets. As of December 31, 2016 and 2015, the liability balances were $125 million and $129 million.

Reinsurance

Reinsurance: Reinsurance accounting allows for contractual cash flows to be reflected as premiums and losses. To qualify for reinsurance accounting, reinsurance agreements must include risk transfer. To meet risk transfer requirements, a reinsurance contract must include both insurance risk, consisting of underwriting and timing risk, and a reasonable possibility of a significant loss for the assuming entity.

Reinsurance receivables related to paid losses are presented at unpaid balances. Reinsurance receivables related to unpaid losses are estimated in a manner consistent with claim and claim adjustment expense reserves or future policy benefits reserves. Reinsurance receivables are reported net of an allowance for uncollectible amounts on the Consolidated Balance Sheets. The cost of reinsurance is primarily accounted for over the life of the underlying reinsured policies using assumptions consistent with those used to account for the underlying policies or over the reinsurance contract period. The ceding of insurance does not discharge the primary liability of the Company.

The Company has established an allowance for uncollectible reinsurance receivables which relates to both amounts already billed on ceded paid losses as well as ceded reserves that will be billed when losses are paid in the future. The allowance for uncollectible reinsurance receivables is estimated on the basis of periodic evaluations of balances due from reinsurers, reinsurer solvency, management's experience and current economic conditions. Reinsurer financial strength ratings are updated and reviewed on an annual basis or sooner if the Company becomes aware of significant changes related to a reinsurer. Because billed receivables generally approximate 3% or less of total reinsurance receivables, the age of the reinsurance receivables related to paid losses is not a significant input into the allowance analysis. Changes in the allowance for uncollectible reinsurance receivables are presented as a component of Insurance claims and policyholders' benefits on the Consolidated Statements of Operations.

Amounts are considered past due based on the reinsurance contract terms. Reinsurance receivables related to paid losses and any related allowance are written off after collection efforts have been exhausted or a negotiated settlement is reached with the reinsurer. Reinsurance receivables related to paid losses from insolvent insurers are written off when the settlement due from the estate can be reasonably estimated. At the time reinsurance receivables related to paid losses are written off, any required adjustment to reinsurance receivables related to unpaid losses is recorded as a component of Insurance claims and policyholders' benefits on the Consolidated Statements of Operations.

Reinsurance contracts that do not effectively transfer the economic risk of loss on the underlying policies are recorded using the deposit method of accounting, which requires that premium paid or received by the ceding company or assuming company be accounted for as a deposit asset or liability. The Company had $3 million recorded as deposit assets as of December 31, 2016 and 2015, and $6 million and $8 million recorded as deposit liabilities as of December 31, 2016 and 2015. Income on reinsurance contracts accounted for under the deposit method is recognized using an effective yield based on the anticipated timing of payments and the remaining life of the contract. When the anticipated timing of payments changes, the effective yield is recalculated to reflect actual payments to date and the estimated timing of future payments. The deposit asset or liability is adjusted to the amount that would have existed had the new effective yield been applied since the inception of the contract.

A loss portfolio transfer is a retroactive reinsurance contract. If the cumulative claim and allocated claim adjustment expenses ceded under a loss portfolio transfer exceed the consideration paid, the resulting gain from such excess is deferred and amortized into earnings in future periods in proportion to actual recoveries under the loss portfolio transfer. In any period in which there is a gain position and a revised estimate of claim and allocated claim adjustment expenses, a portion of the deferred gain is cumulatively recognized in earnings as if the revised estimate was available at the inception date of the loss portfolio transfer.

Deferred acquisition costs

Deferred acquisition costs: Deferrable acquisition costs include commissions, premium taxes and certain underwriting and policy issuance costs which are incremental direct costs of successful contract acquisitions. Acquisition costs related to property and casualty business are deferred and amortized ratably over the period the related premiums are earned. Deferred acquisition costs are presented net of ceding commissions and other ceded acquisition costs.

The Company evaluates deferred acquisition costs for recoverability. Anticipated investment income is considered in the determination of the recoverability of deferred acquisition costs. Adjustments, if necessary, are recorded in current period results of operations.

Deferred acquisition costs related to long term care contracts issued prior to January 1, 2004 include costs which vary with and are primarily related to the acquisition of business. As noted under Future policy benefits reserves, all of the long term care deferred acquisition costs of $289 million were written off as of December 31, 2015 in recognition of a premium deficiency.

Investments in life settlement contracts and related revenue recognition

Investments in life settlement contracts and related revenue recognition: Prior to 2002, the Company purchased investments in life settlement contracts. The Company obtained the ownership and beneficiary rights of an underlying life insurance policy through a life settlement contract with the owner of the life insurance contract.

The Company accounts for its investments in life settlement contracts using the fair value method. Under the fair value method, each life settlement contract is carried at its fair value at the end of each reporting period. The change in fair value estimated through the Company's internal valuation process, life insurance proceeds received and periodic maintenance costs, such as premiums, necessary to keep the underlying policy in force, are recorded in Other revenues on the Consolidated Statements of Operations.

In December 2016, the Company reached agreement on terms to sell the entire portfolio of life settlement contracts to a third party. The Company expects to consummate this transaction in 2017. As a result, the portfolio, which is included within Life & Group Non-Core segment, was determined to be held for sale as of December 31, 2016. Therefore, the contracts were measured at the lower of the carrying amount or the fair value per the agreed terms. This resulted in a $10 million loss recognized within Net realized investment gains. The fair value of the Company's investments in life settlement contracts were $58 million and $74 million as of December 31, 2016 and 2015, and are included in Other assets on the Consolidated Balance Sheets. The cash receipts and payments related to life settlement contracts are included in Cash flows from operating activities on the Consolidated Statements of Cash Flows.

The following table details the values for life settlement contracts. The determination of fair value is discussed in Note C to the Consolidated Financial Statements.

December 31, 2016	Number of Life Settlement Contracts	Fair Value of Life Settlement Contracts (In millions)		Face Amount of Life Insurance Policies (In millions)
Estimated settlements during:
2017	63	$	10	$	34
2018	55	8		30
2019	49	7		26
2020	43	6		23
2021	36	4		19
Thereafter	280	23		153
Total	526	$	58	$	285

The Company uses an actuarial model to estimate the aggregate face amount of life insurance that are expected to settle in each future year and the corresponding fair value. This model projects the likelihood of the insured's death for each inforce policy based upon the Company's estimated mortality rates, which may vary due to the relatively small size of the portfolio of life settlement contracts. The number of life settlement contracts presented in the table above is based upon the average face amount of inforce policies estimated to settle in each future year.

The increase in fair value recognized in Other revenues for the years ended December 31, 2016, 2015 and 2014 on contracts still held at each respective period-end was $7 million, $1 million and $8 million. The gains recognized during the years ended December 31, 2016, 2015 and 2014 on contracts that settled were $8 million, $24 million and $25 million.

Investments

Investments

The Company classifies its fixed maturity securities and its equity securities as either available-for-sale or trading, and as such, they are carried at fair value. Changes in fair value of trading securities are reported within Net investment income on the Consolidated Statements of Operations. Changes in fair value related to available-for-sale securities are reported as a component of Other comprehensive income. Losses may be recognized within Net realized investment gains (losses) on the Consolidated Statements of Operations when a decline in value is determined by the Company to be other-than-temporary.

The cost of fixed maturity securities classified as available-for-sale is adjusted for amortization of premiums and accretion of discounts, which are included in Net investment income on the Consolidated Statements of Operations. The amortization of premium and accretion of discount for fixed maturity securities takes into consideration call and maturity dates that produce the lowest yield. In 2015 the Company changed its accounting principle as previously the amortization of premiums was to maturity. This change in estimate effected by a change in accounting principle was adopted in the fourth quarter of 2015 and decreased Net investment income and the amortized cost of fixed maturity securities by $39 million in the Consolidated Statement of Operations for the year-ended December 31, 2015 and the Consolidated Balance Sheet as of December 31, 2015. The $39 million decrease to Net investment income included a $22 million cumulative adjustment relating to prior periods. The total adjustment decreased Basic and Diluted earnings per share by $0.09 for the year ended December 31, 2015.

To the extent that unrealized gains on fixed income securities supporting long term care products and structured settlements not funded by annuities would result in a premium deficiency if those gains were realized, a related increase in Insurance reserves is recorded, net of tax, as a reduction of net unrealized gains through Other comprehensive income (Shadow Adjustments). Shadow Adjustments, net of tax, decreased $97 million and $177 million for the years ended December 31, 2016 and 2015. As of December 31, 2016 and 2015, net unrealized gains on investments included in Accumulated other comprehensive income (AOCI) were correspondingly reduced by Shadow Adjustments of $1,014 million and $1,111 million.

For asset-backed securities included in fixed maturity securities, the Company recognizes income using an effective yield based on anticipated prepayments and the estimated economic life of the securities. When estimates of prepayments change, the effective yield is recalculated to reflect actual payments to date and anticipated future payments. The amortized cost of high credit quality fixed rate securities is adjusted to the amount that would have existed had the new effective yield been applied since the acquisition of the securities. Such adjustments are reflected in Net investment income on the Consolidated Statements of Operations. Interest income on lower rated and variable rate securities is determined using the prospective yield method.

The Company's carrying value of investments in limited partnerships is its share of the net asset value of each partnership, as determined by the general partner. Certain partnerships for which results are not available on a timely basis are reported on a lag, primarily three months or less. Changes in net asset values are accounted for under the equity method and recorded within Net investment income on the Consolidated Statements of Operations.

Mortgage loans are commercial in nature, are carried at unpaid principal balance, net of unamortized fees and any valuation allowance, and are recorded once funded. Mortgage loans are considered to be impaired loans when it is probable that contractual principal and interest payments will not be collected. A valuation allowance is established for impaired loans to the extent that the present value of expected future cash flows discounted at the loan's original effective interest rate is less than the carrying value of the loan. Interest income from mortgage loans is recognized on an accrual basis using the effective yield method. Accrual of income is generally suspended for mortgage loans that are impaired and collection of principal and interest payments is unlikely. Mortgage loans are considered past due when full principal or interest payments have not been received according to contractual terms.

Other invested assets include overseas deposits and Federal Home Loan Bank of Chicago (FHLBC) stock. FHLBC stock is carried at fair value. Overseas deposits are valued using the net asset value per share (or equivalent) practical expedient. They are primarily short-term government securities, agency securities and corporate bonds held in trusts that are managed by Lloyd's of London. These funds are required of Lloyd's syndicates to protect policyholders in overseas markets and may be denominated in local currency.

Short term investments are carried at fair value, with the exception of cash accounts earning interest, which are carried at cost and approximate fair value. Changes in fair value are reported as a component of Other comprehensive income.

Purchases and sales of all securities are recorded on the trade date, except for private placement debt securities, including bank loan participations, which are recorded once funded. Realized investment gains and losses are determined on the basis of the cost or amortized cost of the specific securities sold.

Variable Interest Entities

In the normal course of investing activities, the Company enters into relationships with variable interest entities (VIEs), as both an investor in limited partnerships and asset-backed securities issued by third-party VIEs. The Company is not the primary beneficiary of these VIEs, and therefore does not consolidate them. The Company determines whether it is the primary beneficiary of a VIE based on a qualitative assessment of the relative power and benefits of the Company and our venture partners. The Company’s maximum exposure to loss with respect to these investments is limited to the investment carrying values included in the Company’s Consolidated Balance Sheets and any unfunded commitments.

Impairments, Other Than Temporary

A security is impaired if the fair value of the security is less than its cost adjusted for accretion, amortization and previously recorded other-than-temporary impairment (OTTI) losses, otherwise defined as an unrealized loss. When a security is impaired, the impairment is evaluated to determine whether it is temporary or other-than-temporary.

Significant judgment is required in the determination of whether an OTTI loss has occurred for a security. The Company follows a consistent and systematic process for determining and recording an OTTI loss. The Company has established a committee responsible for the OTTI process referred to as the Impairment Committee. The Impairment Committee is responsible for evaluating all securities in an unrealized loss position on at least a quarterly basis.

The Impairment Committee’s assessment of whether an OTTI loss has occurred incorporates both quantitative and qualitative information. Fixed maturity securities that the Company intends to sell, or it more likely than not will be required to sell before recovery of amortized cost, are considered to be other-than-temporarily impaired and the entire difference between the amortized cost basis and fair value of the security is recognized as an OTTI loss in earnings. The remaining fixed maturity securities in an unrealized loss position are evaluated to determine if a credit loss exists. The factors considered by the Impairment Committee include (a) the financial condition and near-term and long-term prospects of the issuer, (b) whether the debtor is current on interest and principal payments, (c) credit ratings of the securities and (d) general market conditions and industry or sector specific outlook. The Company also considers results and analysis of cash flow modeling for asset-backed securities, and when appropriate, other fixed maturity securities. The focus of the analysis for asset-backed securities is on assessing the sufficiency and quality of underlying collateral and timing of cash flows based on scenario tests. If the present value of the modeled expected cash flows equals or exceeds the amortized cost of a security, no credit loss is judged to exist and the asset-backed security is deemed to be temporarily impaired. If the present value of the expected cash flows is significantly less than amortized cost, the security is judged to be other-than-temporarily impaired for credit reasons and that shortfall, referred to as the credit component, is recognized as an OTTI loss in earnings. The difference between the adjusted amortized cost basis and fair value, referred to as the non-credit component, is recognized as OTTI in Other comprehensive income. In subsequent reporting periods, a change in intent to sell or further credit impairment on a security whose fair value has not deteriorated will cause the non-credit component originally recorded as OTTI in Other comprehensive income to be recognized as an OTTI loss in earnings. The Company performs the discounted cash flow analysis using stressed scenarios to determine future expectations regarding recoverability. Significant assumptions enter into these cash flow projections including delinquency rates, probable risk of default, loss severity upon a default, over collateralization and interest coverage triggers and credit support from lower level tranches.

The Company applies the same impairment model as described above for the majority of its non-redeemable preferred stock securities on the basis that these securities possess characteristics similar to debt securities and that the issuers maintain their ability to pay dividends. For all other equity securities, in determining whether the security is other-than-temporarily impaired, the Impairment Committee considers a number of factors including, but not limited to: (a) the length of time and the extent to which the fair value has been less than amortized cost, (b) the financial condition and near term prospects of the issuer, (c) the intent and ability of the Company to retain its investment for a period of time sufficient to allow for an anticipated recovery in value and (d) general market conditions and industry or sector specific outlook.

Income Taxes

Income Taxes

The Company and its eligible subsidiaries (CNA Tax Group) are included in the consolidated federal income tax return of Loews and its eligible subsidiaries. The Company accounts for income taxes under the asset and liability method. Under the asset and liability method, deferred income taxes are recognized for temporary differences between the financial statement and tax return bases of assets and liabilities, based on enacted tax rates and other provisions of the tax law. The effect of a change in tax laws or rates on deferred tax assets and liabilities is recognized in income in the period in which such change is enacted. Future tax benefits are recognized to the extent that realization of such benefits is more likely than not, and a valuation allowance is established for any portion of a deferred tax asset that management believes will not be realized.

Pension and Postretirement Benefits

Pension and Postretirement Benefits

The Company recognizes the overfunded or underfunded status of its defined benefit plans in Other assets or Other liabilities on the Consolidated Balance Sheets. Changes in funded status related to prior service costs and credits and actuarial gains and losses are recognized in the year in which the changes occur through Other comprehensive income. Annual service cost, interest cost, expected return on plan assets, amortization of prior service costs and credits and amortization of actuarial gains and losses are recognized in the Consolidated Statements of Operations. The vested benefit obligation for the CNA Retirement Plan is determined based on eligible compensation and accrued service for previously entitled employees. Effective June 30, 2015, future benefit accruals under the CNA Retirement Plan were eliminated and the benefit obligations were frozen.

Stock-Based Compensation

Stock-Based Compensation

The Company records compensation expense using the fair value method for all awards it grants, modifies or cancels primarily on a straight-line basis over the requisite service period, generally three to four years.

Foreign Currency

Foreign Currency

Foreign currency translation gains and losses are reflected in Stockholders' equity as a component of AOCI. The Company's foreign subsidiaries' balance sheet accounts are translated at the exchange rates in effect at each reporting date and income statement accounts are either translated at the exchange rate on the date of the transaction or at the average exchange rates. Foreign currency transaction gains (losses) of $(9) million, $(11) million and $(25) million were included in determining Net income (loss) for the years ended December 31, 2016, 2015 and 2014.

Property and Equipment

Property and Equipment

Property and equipment are carried at cost less accumulated depreciation. Depreciation is based on the estimated useful lives of the various classes of property and equipment and is determined principally on the straight-line method. Furniture and fixtures are depreciated over seven years. Office equipment is depreciated over five years. The estimated lives for data processing equipment and software generally range from three to five years, but can be as long as ten years. Leasehold improvements are depreciated over the corresponding lease terms not to exceed the underlying asset life. The Company's previously owned building and related capital improvements were depreciated over periods not to exceed fifty years.

Goodwill

Goodwill

Goodwill represents the excess of purchase price over the fair value of the net assets of acquired entities and businesses. Goodwill in the International segment may change from period to period as a result of foreign currency translation.

Goodwill is tested for impairment annually or when certain triggering events require such tests. As a result of reviews completed for the year ended December 31, 2016, the Company determined that the estimated fair value of the reporting units were in excess of their carrying value including Goodwill. Changes in future periods in assumptions about the level of economic capital, business growth, earnings projections or the weighted average cost of capital could result in a goodwill impairment.

Other Intangible Assets

Other Intangible Assets

Other intangible assets are reported within Other assets.Finite-lived intangible assets are amortized over their estimated useful lives. Indefinite-lived other intangible assets are tested for impairment annually or when certain triggering events require such tests.

Earnings (Loss) Per Share Data

Earnings (Loss) Per Share Data

Earnings (loss) per share is based on weighted average number of outstanding common shares. Basic earnings (loss) per share excludes the impact of dilutive securities and is computed by dividing Net income (loss) by the weighted average number of common shares outstanding for the period. Diluted earnings (loss) per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock.

For the years ended December 31, 2016, 2015 and 2014, approximately 678 thousand, 534 thousand and 675 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were included in the calculation of diluted earnings per share. For those same periods, approximately 102 thousand, 106 thousand and 170 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were not included in the calculation of diluted earnings per share because the effect would have been antidilutive.

New Accounting Pronouncements and Changes in Accounting Principles [Text Block]

Recently Adopted Accounting Standards Updates (ASU)

In April 2015, the Financial Accounting Standards Board (FASB) issued ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The updated accounting guidance requires debt issuance costs to be presented as a deduction from the corresponding debt liability instead of the historical presentation as an unamortized debt issuance asset. As of January 1, 2016, the Company adopted the updated accounting guidance retrospectively. The Company adjusted its previously reported financial information included herein to reflect the change in accounting guidance for debt issuance costs. The impacts of adopting the new accounting standard on the Company’s Consolidated Balance Sheet as of December 31, 2015, were a decrease in Other assets and a decrease in Long term debt of $2 million.

In May 2015, the FASB issued ASU No. 2015-09, Financial Services-Insurance (Topic 944): Disclosures about Short-Duration Contracts. The updated accounting guidance requires enhanced disclosures to provide additional information about insurance liabilities for short-duration contracts. The updated guidance is effective for annual financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within the annual periods beginning after December 15, 2016. The Company has adopted the change in disclosure requirements for short-duration contracts.

In May 2015, the FASB issued ASU No. 2015-07, Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent). The updated accounting guidance removes the requirement to categorize assets measured at fair value utilizing the net asset value per share (or equivalent) practical expedient within the fair value hierarchy. As of January 1, 2016, the Company adopted the updated accounting guidance retrospectively. The Company adjusted its previously reported financial information included herein to reflect the change in accounting guidance for assets measured using the net asset value. The impact of adopting the new accounting standard resulted in excluding overseas deposits of $31 million and $27 million and limited partnership investments held within the pension plan of $876 million and $935 million from the fair value level disclosures as of December 31, 2016 and December 31, 2015.

Recently Issued Accounting Standard Update

Accounting Standards Pending Adoption

In May 2014, the FASB issued ASU No. 2014-09, Revenue Recognition (Topic 606): Revenue from Contracts with Customers. The standard excludes from its scope the accounting for insurance contracts, financial instruments, and certain other agreements that are governed under other GAAP guidance. The updated guidance requires an entity to recognize revenue as performance obligations are met, in an amount that reflects the consideration the entity is entitled to receive for the transfer of the promised goods or services. The standard is effective for interim and annual reporting periods beginning after December 15, 2017 and may be applied retrospectively or through a cumulative effect adjustment to retained earnings at the date of adoption. The Company has not made a decision on the method of adoption and is currently evaluating the effect the updated guidance will have on the Company’s financial statements.  While the Company anticipates some changes to revenue recognition for certain of our warranty products and services, we do not currently believe ASU 2014-09 will have a material effect on our Consolidated Financial Statements.

In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The updated accounting guidance requires changes to the reporting model for financial instruments. The guidance is effective for interim and annual periods beginning after December 15, 2017. The Company is currently evaluating the effect the guidance will have on the Company's financial statements, and expects the primary change for the Company to be the requirement for equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842): Accounting for Leases. The updated accounting guidance requires lessees to recognize on the balance sheet the assets and liabilities for the rights and obligations created by all leases, including those historically accounted for as operating leases. The guidance is effective for interim and annual periods beginning after December 15, 2018. The Company is currently evaluating the effect the updated guidance will have on the Company's financial statements. It is expected that assets and liabilities will increase based on the present value of remaining lease payments for leases in place at the adoption date; however, this is not expected to be material to the Company's results of operations or financial position.

In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvementsto Employee Share-Based Payment Accounting. The updated accounting guidance simplifies the accounting for share-based payment award transactions, including income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance is effective for annual and interim periods beginning after December 15, 2016. The Company is currently evaluating the effect the updated guidance will have on the Company’s financial statements, but anticipates the primary change to be the recognition of excess tax benefits or deficiencies on vesting or settlement of awards as an income tax benefit or expense within net income and the related cash flows classified within operating activities.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurementof Credit Losses on Financial Instruments. The updated accounting guidance requires changes to the recognition of credit losses on financial instruments not accounted for at fair value through net income. The guidance is effective for interim and annual periods beginning after December 15, 2019. The Company is currently evaluating the effect the guidance will have on the Company's financial statements, but expects the primary changes to be the use of the expected credit loss model for its mortgage loan portfolio and reinsurance receivables and the presentation of credit losses within the available-for-sale fixed maturities portfolio through an allowance method rather than as a direct write-down. The expected credit loss model will require a financial asset to be presented at the net amount expected to be collected. The allowance method for available-for-sale debt securities will allow the Company to record reversals of credit losses if the estimate of credit losses declines.

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Summary of Significant Accounting Policies (Life Settlement Contracts) (Tables)

12 Months Ended

Dec. 31, 2016

Life Settlement Contracts, Fair Value Method, Number of Contracts, Fiscal Year Maturity [Abstract]

Life settlement contracts

The following table details the values for life settlement contracts. The determination of fair value is discussed in Note C to the Consolidated Financial Statements.

December 31, 2016	Number of Life Settlement Contracts	Fair Value of Life Settlement Contracts (In millions)		Face Amount of Life Insurance Policies (In millions)
Estimated settlements during:
2017	63	$	10	$	34
2018	55	8		30
2019	49	7		26
2020	43	6		23
2021	36	4		19
Thereafter	280	23		153
Total	526	$	58	$	285

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Investments (Tables)

12 Months Ended

Dec. 31, 2016

Investments [Abstract]

Net investment income

The significant components of Net investment income are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Fixed maturity securities	$	1,819		$	1,751		$	1,803
Equity securities	10			12			12
Limited partnership investments	155			92			263
Mortgage loans	41			33			31
Short term investments	8			6			3
Trading portfolio	10			8			10
Other	4			1			3
Gross investment income	2,047			1,903			2,125
Investment expense	(59		)	(63		)	(58		)
Net investment income	$	1,988		$	1,840		$	2,067

Net realized investment gains (losses)

Net realized investment gains (losses) are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Net realized investment gains (losses):
Fixed maturity securities:
Gross realized gains	$	204		$	131		$	170
Gross realized losses	(138		)	(197		)	(129		)
Net realized investment gains (losses) on fixed maturity securities	66			(66		)	41
Equity securities:
Gross realized gains	5			2			8
Gross realized losses	(10		)	(25		)	(7		)
Net realized investment gains (losses) on equity securities	(5		)	(23		)	1
Derivatives	(2		)	10			(1		)
Short term investments and other	(9		)	12			16
Net realized investment gains (losses)	$	50		$	(67	)	$	57

Net change in unrealized gains (losses) on investments

Net change in unrealized gains on investments is presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Net change in unrealized gains on investments:
Fixed maturity securities	$	225		$	(1,114	)	$	1,511
Equity securities	(2		)	(6		)	6
Other	1			1			—
Total net change in unrealized gains on investments	$	224		$	(1,119	)	$	1,517

Components of net other than temporary impairment losses recognized in earnings by asset type

The components of OTTI losses recognized in earnings by asset type are presented in the following table.

Years ended December 31
(In millions)	2016		2015		2014
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	59	$	104	$	18
States, municipalities and political subdivisions	—		18		46
Asset-backed:
Residential mortgage-backed	10		8		5
Other asset-backed	3		1		1
Total asset-backed	13		9		6
Total fixed maturity securities available-for-sale	72		131		70
Equity securities available-for-sale -- Common stock	9		25		7
OTTI losses recognized in earnings	$	81	$	156	$	77

Summary of fixed maturity and equity securities

The following tables present a summary of fixed maturity and equity securities.

December 31, 2016	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,711	$	1,323	$	76	$	18,958	$	(1	)
States, municipalities and political subdivisions	12,060		1,213		33		13,240		(16		)
Asset-backed:
Residential mortgage-backed	5,004		120		51		5,073		(28		)
Commercial mortgage-backed	2,016		48		24		2,040		—
Other asset-backed	1,022		8		5		1,025		—
Total asset-backed	8,042		176		80		8,138		(28		)
U.S. Treasury and obligations of government-sponsored enterprises	83		10		—		93		—
Foreign government	435		13		3		445		—
Redeemable preferred stock	18		1		—		19		—
Total fixed maturity securities available-for-sale	38,349		2,736		192		40,893		$	(45	)
Total fixed maturity securities trading	12						12
Equity securities available-for-sale:
Common stock	13		6		—		19
Preferred stock	93		2		4		91
Total equity securities available-for-sale	106		8		4		110
Total	$	38,467	$	2,744	$	196	$	41,015

December 31, 2015	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,080	$	1,019	$	342	$	17,757	$	—
States, municipalities and political subdivisions	11,729		1,453		8		13,174		(4		)
Asset-backed:
Residential mortgage-backed	4,935		154		17		5,072		(37		)
Commercial mortgage-backed	2,154		55		12		2,197		—
Other asset-backed	923		6		8		921		—
Total asset-backed	8,012		215		37		8,190		(37		)
U.S. Treasury and obligations of government-sponsored enterprises	62		5		—		67		—
Foreign government	334		13		1		346		—
Redeemable preferred stock	33		2		—		35		—
Total fixed maturity securities available-for-sale	37,250		2,707		388		39,569		$	(41	)
Total fixed maturity securities trading	3						3
Equity securities available-for-sale:
Common stock	46		3		1		48
Preferred stock	145		7		3		149
Total equity securities available-for-sale	191		10		4		197
Total	$	37,444	$	2,717	$	392	$	39,769

Securities in a gross unrealized loss position

The following tables present the estimated fair value and gross unrealized losses of fixed maturity and equity securities in a gross unrealized loss position by the length of time in which the securities have continuously been in that position.

	Less than 12 Months				12 Months or Longer				Total
December 31, 2016	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	2,615	$	61	$	254	$	15	$	2,869	$	76
States, municipalities and political subdivisions	959		32		23		1		982		33
Asset-backed:
Residential mortgage-backed	2,136		44		201		7		2,337		51
Commercial mortgage-backed	756		22		69		2		825		24
Other asset-backed	398		5		24		—		422		5
Total asset-backed	3,290		71		294		9		3,584		80
U.S. Treasury and obligations of government-sponsored enterprises	5		—		—		—		5		—
Foreign government	108		3		—		—		108		3
Redeemable preferred stock	—		—		—		—		—		—
Total fixed maturity securities available-for-sale	6,977		167		571		25		7,548		192
Equity securities available-for-sale -- Preferred stock	12		—		13		4		25		4
Total	$	6,989	$	167	$	584	$	29	$	7,573	$	196

	Less than 12 Months				12 Months or Longer				Total
December 31, 2015	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	4,882	$	302	$	162	$	40	$	5,044	$	342
States, municipalities and political subdivisions	338		8		75		—		413		8
Asset-backed:
Residential mortgage-backed	963		9		164		8		1,127		17
Commercial mortgage-backed	652		10		96		2		748		12
Other asset-backed	552		8		5		—		557		8
Total asset-backed	2,167		27		265		10		2,432		37
U.S. Treasury and obligations of government-sponsored enterprises	4		—		—		—		4		—
Foreign government	54		1		—		—		54		1
Redeemable preferred stock	3		—		—		—		3		—
Total fixed maturity securities available-for-sale	7,448		338		502		50		7,950		388
Equity securities available-for-sale:
Common Stock	3		1		—		—		3		1
Preferred stock	13		3		—		—		13		3
Total equity securities available-for-sale	16		4		—		—		16		4
Total	$	7,464	$	342	$	502	$	50	$	7,966	$	392

Activity related to the pretax fixed maturity credit loss component reflected within retained earnings for securities still held for which a portion of an OTTI loss was recognized in OCI

The following table presents the activity related to the pretax credit loss component reflected in Retained earnings on fixed maturity securities still held as of December 31, 2016, 2015 and 2014 for which a portion of an OTTI loss was recognized in Other comprehensive income (loss).

Years ended December 31
(In millions)	2016			2015			2014
Beginning balance of credit losses on fixed maturity securities	$	53		$	62		$	74
Reductions for securities sold during the period	(16		)	(9		)	(9		)
Reductions for securities the Company intends to sell or more likely than not will be required to sell	(1		)	—			(3		)
Ending balance of credit losses on fixed maturity securities	$	36		$	53		$	62

Contractual maturity

The following table presents available-for-sale fixed maturity securities by contractual maturity.

December 31	2016				2015
(In millions)	Cost or Amortized Cost		Estimated Fair Value		Cost or Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,779	$	1,828	$	1,574	$	1,595
Due after one year through five years	7,566		7,955		7,721		8,070
Due after five years through ten years	15,892		16,332		14,652		14,915
Due after ten years	13,112		14,778		13,303		14,989
Total	$	38,349	$	40,893	$	37,250	$	39,569

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Fair Value (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on a recurring basis

Assets and liabilities measured at fair value on a recurring basis are presented in the following tables.

December 31, 2016								Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2			Level 3
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	18,840		$	130	$	18,970
States, municipalities and political subdivisions	—		13,239			1		13,240
Asset-backed:
Residential mortgage-backed	—		4,944			129		5,073
Commercial mortgage-backed	—		2,027			13		2,040
Other asset-backed	—		968			57		1,025
Total asset-backed	—		7,939			199		8,138
U.S. Treasury and obligations of government-sponsored enterprises	93		—			—		93
Foreign government	—		445			—		445
Redeemable preferred stock	19		—			—		19
Total fixed maturity securities	112		40,463			330		40,905
Equity securities	91		—			19		110
Other invested assets	—		5			—		5
Short term investments	475		853			—		1,328
Life settlement contracts, included in Other assets	—		—			58		58
Total assets	$	678	$	41,321		$	407	$	42,406
Liabilities
Other liabilities	$	—	$	(3	)	$	—	$	(3	)
Total liabilities	$	—	$	(3	)	$	—	$	(3	)

December 31, 2015								Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2			Level 3
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	17,592		$	168	$	17,760
States, municipalities and political subdivisions	—		13,172			2		13,174
Asset-backed:
Residential mortgage-backed	—		4,938			134		5,072
Commercial mortgage-backed	—		2,175			22		2,197
Other asset-backed	—		868			53		921
Total asset-backed	—		7,981			209		8,190
U.S. Treasury and obligations of government-sponsored enterprises	66		1			—		67
Foreign government	—		346			—		346
Redeemable preferred stock	35		—			—		35
Total fixed maturity securities	101		39,092			379		39,572
Equity securities	177		—			20		197
Other invested assets	—		17			—		17
Short term investments	448		1,134			—		1,582
Life settlement contracts, included in Other assets	—		—			74		74
Total assets	$	726	$	40,243		$	473	$	41,442
Liabilities
Other liabilities	$	—	$	(5	)	$	—	$	(5	)
Total liabilities	$	—	$	(5	)	$	—	$	(5	)

Table of reconciliation for assets and liablities measured at fair value on a recurring basis using significant unobservable inputs

The tables below present a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

Level 3 (In millions)	Balance as of January 1, 2016		Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)*			Net change in unrealized appreciation (depreciation) included in Other comprehensive income (loss)			Purchases		Sales			Settlements			Transfers into Level 3		Transfers out of Level 3			Balance as of December 31, 2016		Unrealized gains (losses) on Level 3 assets and liabilities held as of December 31, 2016 recognized in Net income (loss)*
Fixed maturity securities:
Corporate and other bonds	$	168	$	1		$	1		$	163	$	(36	)	$	(103	)	$	—	$	(64	)	$	130	$	—
States, municipalities and political subdivisions	2		—			—			—		—			(1		)	—		—			1		—
Asset-backed:
Residential mortgage-backed	134		3			(5		)	15		—			(14		)	56		(60		)	129		—
Commercial mortgage-backed	22		(1		)	(1		)	32		—			(17		)	3		(25		)	13		—
Other asset-backed	53		(2		)	1			86		(25		)	(1		)	2		(57		)	57		—
Total asset-backed	209		—			(5		)	133		(25		)	(32		)	61		(142		)	199		—
Total fixed maturity securities	379		1			(4		)	296		(61		)	(136		)	61		(206		)	330		—
Equity securities	20		(1		)	—			—		—			—			—		—			19		(2		)
Life settlement contracts	74		5			—			—		—			(21		)	—		—			58		(3		)
Total	$	473	$	5		$	(4	)	$	296	$	(61	)	$	(157	)	$	61	$	(206	)	$	407	$	(5	)

Level 3 (In millions)	Balance as of January 1, 2015		Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)*			Net change in unrealized appreciation (depreciation) included in Other comprehensive income (loss)			Purchases		Sales			Settlements			Transfers into Level 3		Transfers out of Level 3			Balance as of December 31, 2015		Unrealized gains (losses) on Level 3 assets and liabilities held as of December 31, 2015 recognized in Net income (loss)*
Fixed maturity securities:
Corporate and other bonds	$	162	$	(2	)	$	(3	)	$	65	$	(13	)	$	(35	)	$	40	$	(46	)	$	168	$	(2	)
States, municipalities and political subdivisions	94		1			—			—		—			(10		)	—		(83		)	2		—
Asset-backed:
Residential mortgage-backed	189		5			(3		)	81		—			(35		)	14		(117		)	134		—
Commercial mortgage-backed	83		7			(4		)	23		—			(17		)	17		(87		)	22		—
Other asset-backed	655		3			3			130		(263		)	(52		)	7		(430		)	53		—
Total asset-backed	927		15			(4		)	234		(263		)	(104		)	38		(634		)	209		—
Total fixed maturity securities	1,183		14			(7		)	299		(276		)	(149		)	78		(763		)	379		(2		)
Equity securities	16		—			(1		)	4		—			—			1		—			20		—
Life settlement contracts	82		25			—			—		—			(33		)	—		—			74		1
Total	$	1,281	$	39		$	(8	)	$	303	$	(276	)	$	(182	)	$	79	$	(763	)	$	473	$	(1	)

Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets

The following tables present quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurements of Level 3 assets. Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company. The valuation of life settlement contracts as of December 31, 2016 was based on the terms of the pending sale of the contracts to a third party, therefore the contracts are not included in the table below.

December 31, 2016	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	106	Discounted cash flow	Credit spread	2% - 40% (4%)

December 31, 2015	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	138	Discounted cash flow	Credit spread	3% - 184% (6%)
Life settlement contracts	74		Discounted cash flow	Discount rate risk premium	9%
				Mortality assumption	55% - 1676% (164%)

Carrying amount and estimated fair value of financial instrument assets and liabilities not measured at fair value

The carrying amount and estimated fair value of the Company's financial assets and liabilities which are not measured at fair value on the Consolidated Balance Sheets are presented in the following tables.

December 31, 2016	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	591	$	—	$	—	$	594	$	594
Liabilities
Long term debt	$	2,710	$	—	$	2,952	$	—	$	2,952

December 31, 2015	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	678	$	—	$	—	$	688	$	688
Liabilities
Short term debt	$	350	$	—	$	360	$	—	$	360
Long term debt	2,210		—		2,433		—		2,433

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Reconcilliation between the Company's federal income tax (expense) benefit at statutory rates and the recorded income tax (expense) benefit

The following table presents a reconciliation between the Company's federal income tax expense at statutory rates and the recorded income tax expense, excluding discontinued operations.

Years ended December 31
(In millions)	2016			2015			2014
Income tax expense at statutory rates	$	(398	)	$	(192	)	$	(423	)
Tax benefit from tax exempt income	124			123			119
Foreign taxes and credits	3			9			(6		)
Other tax expense	(7		)	(10		)	(9		)
Income tax expense	$	(278	)	$	(70	)	$	(319	)

Current and deferred components of the Company's income tax (expense) benefit

The following table presents the current and deferred components of the Company's income tax expense, excluding discontinued operations.

Years ended December 31
(In millions)	2016			2015			2014
Current tax expense	$	(142	)	$	(220	)	$	(318	)
Deferred tax benefit (expense)	(136		)	150			(1		)
Total income tax expense	$	(278	)	$	(70	)	$	(319	)

Significant components of the Company's deferred tax assets and liabilities

The deferred tax effects of the significant components of the Company's deferred tax assets and liabilities are presented in the following table.

December 31
(In millions)	2016		2015
Deferred Tax Assets:
Insurance reserves:
Property and casualty claim and claim adjustment expense reserves	$	125	$	178
Unearned premium reserves	206		230
Receivables	27		29
Employee benefits	272		281
Life settlement contracts	56		48
Deferred retroactive reinsurance benefit	117		84
Investment valuation differences	—		29
Other assets	148		142
Gross deferred tax assets	951		1,021
Deferred Tax Liabilities:
Investment valuation differences	57		—
Deferred acquisition costs	120		117
Net unrealized gains	309		202
Other liabilities	86		64
Gross deferred tax liabilities	572		383
Net deferred tax asset	$	379	$	638

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Claim and Claim Adjustment Expense Reserves (Tables)

12 Months Ended

Dec. 31, 2016

Liability for Claims and Claims Adjustment Expense [Abstract]

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]

The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves of the Life & Group Non-Core segment.

As of or for the years ended December 31
(In millions)	2016			2015			2014
Reserves, beginning of year:
Gross	$	22,663		$	23,271		$	24,089
Ceded	4,087			4,344			4,972
Net reserves, beginning of year	18,576			18,927			19,117
Change in net reserves due to acquisition (disposition) of subsidiaries	—			—			(13		)
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year	5,025			4,934			5,043
Decrease in provision for insured events of prior years	(342		)	(255		)	(36		)
Amortization of discount	175			166			161
Total net incurred (1)	4,858			4,845			5,168
Net payments attributable to:
Current year events	(967		)	(856		)	(945		)
Prior year events	(4,167		)	(4,089		)	(4,355		)
Total net payments	(5,134		)	(4,945		)	(5,300		)
Foreign currency translation adjustment and other	(51		)	(251		)	(45		)
Net reserves, end of year	18,249			18,576			18,927
Ceded reserves, end of year	4,094			4,087			4,344
Gross reserves, end of year	$	22,343		$	22,663		$	23,271

(1) Total net incurred above does not agree to Insurance claims and policyholders' benefits as reflected on the Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance and loss deductible receivables, and benefit expenses related to future policy benefits, which are not reflected in the table above.

Gross and net carried claim and claim adjustment expense reserves

The following tables present the gross and net carried reserves.

December 31, 2016	Specialty		Commercial		International		Life & Group Non-Core		Corporate & Other Non-Core		Total
(In millions)
Gross Case Reserves	$	1,871	$	4,661	$	632	$	3,172	$	1,524	$	11,860
Gross IBNR Reserves	4,278		4,233		696		186		1,090		10,483
Total Gross Carried Claim and Claim Adjustment Expense Reserves	$	6,149	$	8,894	$	1,328	$	3,358	$	2,614	$	22,343
Net Case Reserves	$	1,681	$	4,353	$	548	$	2,951	$	94	$	9,627
Net IBNR Reserves	3,723		3,952		653		158		136		8,622
Total Net Carried Claim and Claim Adjustment Expense Reserves	$	5,404	$	8,305	$	1,201	$	3,109	$	230	$	18,249

December 31, 2015	Specialty		Commercial		International		Life & Group Non-Core		Corporate & Other Non-Core		Total
(In millions)
Gross Case Reserves	$	2,011	$	4,975	$	622	$	2,973	$	1,521	$	12,102
Gross IBNR Reserves	4,258		4,208		725		247		1,123		10,561
Total Gross Carried Claim and Claim Adjustment Expense Reserves	$	6,269	$	9,183	$	1,347	$	3,220	$	2,644	$	22,663
Net Case Reserves	$	1,810	$	4,651	$	531	$	2,714	$	130	$	9,836
Net IBNR Reserves	3,758		3,925		688		216		153		8,740
Total Net Carried Claim and Claim Adjustment Expense Reserves	$	5,568	$	8,576	$	1,219	$	2,930	$	283	$	18,576

Net prior year development

Changes in estimates of claim and allocated claim adjustment expense reserves and premium accruals, net of reinsurance, for prior years are defined as net prior year development. These changes can be favorable or unfavorable. The following tables and discussion present the net prior year development recorded for Specialty, Commercial, International and Corporate & Other Non-Core segments.

Year ended December 31, 2016
(In millions)	Specialty			Commercial			International			Corporate & Other Non-Core		Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(287	)	$	55		$	(58	)	$	2	$	(288	)
Pretax (favorable) unfavorable premium development	(18		)	(2		)	(6		)	—		(26		)
Total pretax (favorable) unfavorable net prior year development	$	(305	)	$	53		$	(64	)	$	2	$	(314	)

Year ended December 31, 2015
(In millions)	Specialty			Commercial			International			Corporate & Other Non-Core		Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(141	)	$	(15	)	$	(54	)	$	—	$	(210	)
Pretax (favorable) unfavorable premium development	(11		)	(15		)	18			—		(8		)
Total pretax (favorable) unfavorable net prior year development	$	(152	)	$	(30	)	$	(36	)	$	—	$	(218	)

Year ended December 31, 2014
(In millions)	Specialty			Commercial			International			Corporate & Other Non-Core			Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(136	)	$	176		$	(59	)	$	(2	)	$	(21	)
Pretax (favorable) unfavorable premium development	(13		)	(20		)	2			(1		)	(32		)
Total pretax (favorable) unfavorable net prior year development	$	(149	)	$	156		$	(57	)	$	(3	)	$	(53	)

Specialty [Member]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Net prior year claim and allocated claim adjustment expense reserve development

The following table presents further detail of the net prior year claim and allocated claim adjustment expense reserve development (development) recorded for the Specialty segment.

Years ended December 31
(In millions)	2016			2015			2014
Pretax (favorable) unfavorable development:
Medical Professional Liability	$	(37	)	$	(43	)	$	39
Other Professional Liability and Management Liability	(130		)	—			(87		)
Surety	(63		)	(69		)	(82		)
Warranty	4			(2		)	(2		)
Other	(61		)	(27		)	(4		)
Total pretax (favorable) unfavorable development	$	(287	)	$	(141	)	$	(136	)

Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block]

The table below provides the line of business composition of the net liability for unpaid claim and claim adjustment expenses for the Specialty segment.

As of December 31
(In millions)	2016
Net liability for unpaid claim and claim adjustment expenses:
Medical Professional Liability	$	1,779
Other Professional Liability and Management Liability	3,063
Surety	394
Warranty	37
Other	131
Total net liability for unpaid claim and claim adjustment expenses	$	5,404

Specialty - Medical Professional Liability [Member]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Short-Duration Contracts Net Incurred Claims and Allocated Claim Adjustment Expenses [Table Text Block]

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	448	$	452	$	444	$	427	$	395	$	391	$	390	$	401	$	399	$	385	$	9	12,122
2008			426		451		496		480		468		468		467		455		442		9		14,094
2009					462		469		494		506		480		471		463		432		12		15,573
2010							483		478		478		486		470		446		403		16		15,206
2011									486		492		507		533		501		491		23		17,428
2012											526		529		575		567		559		47		18,375
2013													534		540		560		567		95		19,565
2014															511		548		585		165		19,286
2015																	480		539		278		16,798
2016																			469		400		11,600
																	Total		$	4,872	$	1,054

Short-Duration Contracts Net Cumulative Paid Claim Adjustment Expenses Reconciliation of Total Liability for Unpaid Claim and Claim Adjustment Expense [Table Text Block]

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	11	$	68	$	134	$	201	$	247	$	296	$	326	$	352	$	364	$	365
2008			9		90		207		282		332		377		395		409		428
2009					9		75		180		278		328		353		377		396
2010							11		93		186		273		338		361		371
2011									18		121		225		315		379		407
2012											15		121		236		359		428
2013													18		121		259		364
2014															25		149		274
2015																	22		105
2016																			18
																	Total		$	3,156
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	1,716
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			30
Liability for unallocated claim adjustment expenses for accident years presented																			33
Total net liability for unpaid claim and claim adjustment expenses																			$	1,779

Short-Duration Contracts Reserve Development [Table Text Block]

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	4	$	(8	)	$	(17	)	$	(32	)	$	(4	)	$	(1	)	$	11		$	(2	)	$	(14	)	$	(63	)
2008			25			45			(16		)	(12		)	—			(1		)	(12		)	(13		)	16
2009						7			25			12			(26		)	(9		)	(8		)	(31		)	(30		)
2010									(5		)	—			8			(16		)	(24		)	(43		)	(80		)
2011												6			15			26			(32		)	(10		)	5
2012															3			46			(8		)	(8		)	33
2013																		6			20			7			33
2014																					37			37			74
2015																								59			59
Total net development for the accident years presented above																		$	63		$	(29	)	$	(16	)
Total net development for accident years prior to 2007																		(24		)	(14		)	(21		)
Total																		$	39		$	(43	)	$	(37	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

Specialty - Other Professional and Management Liability [Member]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Short-Duration Contracts Net Incurred Claims and Allocated Claim Adjustment Expenses [Table Text Block]

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	804	$	817	$	806	$	754	$	734	$	724	$	704	$	681	$	662	$	662	$	13	16,011
2008			916		933		954		924		915		880		850		845		827		35		16,326
2009					829		873		903		898		891		900		895		903		50		17,263
2010							825		827		850		848		846		836		823		39		17,796
2011									876		904		933		948		944		910		107		18,620
2012											907		894		876		870		833		107		18,228
2013													844		841		879		840		137		17,324
2014															841		859		854		306		16,886
2015																	847		851		478		16,391
2016																			859		742		15,045
																	Total		$	8,362	$	2,014

Short-Duration Contracts Net Cumulative Paid Claim Adjustment Expenses Reconciliation of Total Liability for Unpaid Claim and Claim Adjustment Expense [Table Text Block]

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	32	$	162	$	307	$	397	$	472	$	524	$	564	$	585	$	593	$	614
2008			39		181		376		515		600		641		678		719		741
2009					37		195		358		550		638		719		769		798
2010							31		203		404		541		630		670		721
2011									71		313		502		604		682		726
2012											57		248		398		570		648
2013													51		240		426		583
2014															51		212		375
2015																	48		209
2016																			60
																	Total		$	5,475
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	2,887
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			104
Liability for unallocated claim adjustment expenses for accident years presented																			72
Total net liability for unpaid claim and claim adjustment expenses																			$	3,063

Short-Duration Contracts Reserve Development [Table Text Block]

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	13	$	(11	)	$	(52	)	$	(20	)	$	(10	)	$	(20	)	$	(23	)	$	(19	)	$	—		$	(142	)
2008			17			21			(30		)	(9		)	(35		)	(30		)	(5		)	(18		)	(89		)
2009						44			30			(5		)	(7		)	9			(5		)	8			74
2010									2			23			(2		)	(2		)	(10		)	(13		)	(2		)
2011												28			29			15			(4		)	(34		)	34
2012															(13		)	(18		)	(6		)	(37		)	(74		)
2013																		(3		)	38			(39		)	(4		)
2014																					18			(5		)	13
2015																								4			4
Total net development for the accident years presented above																		$	(52	)	$	7		$	(134	)
Total net development for accident years prior to 2007																		(35		)	(7		)	4
Total																		$	(87	)	$	—		$	(130	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

Specialty - Surety [Member]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Short-Duration Contracts Net Incurred Claims and Allocated Claim Adjustment Expenses [Table Text Block]

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	98	$	107	$	81	$	57	$	59	$	56	$	51	$	49	$	49	$	50	$	—	6,270
2008			114		114		73		68		61		52		48		45		44		—		7,153
2009					114		114		103		85		68		59		52		53		1		6,654
2010							112		112		111		84		76		66		63		8		5,943
2011									120		121		116		87		75		70		9		5,760
2012											120		122		98		70		52		16		5,473
2013													120		121		115		106		24		4,890
2014															123		124		94		51		4,737
2015																	131		131		100		4,279
2016																			124		110		2,902
																	Total		$	787	$	319

Short-Duration Contracts Net Cumulative Paid Claim Adjustment Expenses Reconciliation of Total Liability for Unpaid Claim and Claim Adjustment Expense [Table Text Block]

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	12	$	30	$	40	$	45	$	46	$	46	$	46	$	48	$	49	$	50
2008			9		27		35		39		42		43		43		43		43
2009					13		24		34		41		43		45		46		47
2010							13		34		50		55		57		58		55
2011									19		42		55		58		60		60
2012											5		32		34		35		35
2013													16		40		69		78
2014															7		30		38
2015																	7		26
2016																			5
																	Total		$	437
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	350
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			16
Liability for unallocated claim adjustment expenses for accident years presented																			28
Total net liability for unpaid claim and claim adjustment expenses																			$	394

Short-Duration Contracts Reserve Development [Table Text Block]

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	9	$	(26	)	$	(24	)	$	2		$	(3	)	$	(5	)	$	(2	)	$	—		$	1		$	(48	)
2008			—			(41		)	(5		)	(7		)	(9		)	(4		)	(3		)	(1		)	(70		)
2009						—			(11		)	(18		)	(17		)	(9		)	(7		)	1			(61		)
2010									—			(1		)	(27		)	(8		)	(10		)	(3		)	(49		)
2011												1			(5		)	(29		)	(12		)	(5		)	(50		)
2012															2			(24		)	(28		)	(18		)	(68		)
2013																		1			(6		)	(9		)	(14		)
2014																					1			(30		)	(29		)
2015																								—			—
Total net development for the accident years presented above																		$	(75	)	$	(65	)	$	(64	)
Total net development for accident years prior to 2007																		(7		)	(4		)	1
Total																		$	(82	)	$	(69	)	$	(63	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

Commercial [Member]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Net prior year claim and allocated claim adjustment expense reserve development

The following table presents further detail of the development recorded for the Commercial segment.

Years ended December 31
(In millions)	2016			2015			2014
Pretax (favorable) unfavorable development:
Commercial Auto	$	(46	)	$	(22	)	$	31
General Liability	(28		)	(33		)	45
Workers' Compensation	150			80			139
Property and Other	(21		)	(40		)	(39		)
Total pretax (favorable) unfavorable development	$	55		$	(15	)	$	176

Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block]

The table below provides the line of business composition of the net liability for unpaid claim and claim adjustment expenses for the Commercial segment.

As of December 31
(In millions)	2016
Net Claim and claim adjustment expenses:
Commercial Auto	$	424
General Liability	3,248
Workers' Compensation	4,306
Property and Other	327
Total net liability for claim and claim adjustment expenses	$	8,305

Commercial - Auto [Member]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Short-Duration Contracts Net Incurred Claims and Allocated Claim Adjustment Expenses [Table Text Block]

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	348	$	367	$	368	$	360	$	355	$	358	$	356	$	355	$	354	$	352	$	—	67,473
2008			322		323		316		306		309		305		298		298		296		—		56,407
2009					287		272		274		278		281		277		275		272		—		47,325
2010							262		274		279		283		291		286		281		1		46,324
2011									262		273		279		293		290		285		5		46,676
2012											270		282		292		296		300		11		45,279
2013													242		259		257		241		20		38,513
2014															231		221		210		40		32,958
2015																	199		197		65		29,714
2016																			196		105		25,196
																	Total		$	2,630	$	247

Short-Duration Contracts Net Cumulative Paid Claim Adjustment Expenses Reconciliation of Total Liability for Unpaid Claim and Claim Adjustment Expense [Table Text Block]

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	93	$	185	$	250	$	295	$	329	$	340	$	348	$	349	$	350	$	351
2008			83		158		210		244		274		289		291		292		293
2009					72		128		188		229		257		269		270		270
2010							72		137		197		240		265		274		279
2011									78		141		193		241		264		275
2012											77		157		214		253		276
2013													73		132		164		195
2014															63		100		135
2015																	52		95
2016																			51
																	Total		$	2,220
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	410
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			4
Liability for unallocated claim adjustment expenses for accident years presented																			10
Total net liability for unpaid claim and claim adjustment expenses																			$	424

Short-Duration Contracts Reserve Development [Table Text Block]

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)		2010(1)			2011(1)			2012(1)		2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	19	$	1	$	(8	)	$	(5	)	$	3	$	(2	)	$	(1	)	$	(1	)	$	(2	)	$	4
2008			1		(7		)	(10		)	3		(4		)	(7		)	—			(2		)	(26		)
2009					(15		)	2			4		3			(4		)	(2		)	(3		)	(15		)
2010								12			5		4			8			(5		)	(5		)	19
2011											11		6			14			(3		)	(5		)	23
2012													12			10			4			4			30
2013																17			(2		)	(16		)	(1		)
2014																			(10		)	(11		)	(21		)
2015																						(2		)	(2		)
Total net development for the accident years presented above																$	37		$	(19	)	$	(42	)
Total net development for accident years prior to 2007																(6		)	(3		)	(4		)
Total																$	31		$	(22	)	$	(46	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

Commercial - General Liability [Member]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Short-Duration Contracts Net Incurred Claims and Allocated Claim Adjustment Expenses [Table Text Block]

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	774	$	673	$	678	$	639	$	610	$	600	$	559	$	545	$	548	$	540	$	28	53,553
2008			611		604		630		647		633		632		613		600		591		18		44,586
2009					591		637		634		633		629		623		619		622		16		43,955
2010							566		597		599		649		695		675		659		25		43,378
2011									537		534		564		610		611		621		41		38,101
2012											539		563		579		570		558		63		34,037
2013													615		645		634		643		142		32,897
2014															627		634		635		224		26,744
2015																	573		574		330		21,687
2016																			622		495		16,720
																	Total		$	6,065	$	1,382

Short-Duration Contracts Net Cumulative Paid Claim Adjustment Expenses Reconciliation of Total Liability for Unpaid Claim and Claim Adjustment Expense [Table Text Block]

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	30	$	130	$	236	$	328	$	413	$	458	$	481	$	492	$	497	$	504
2008			31		129		261		390		473		528		550		560		567
2009					33		112		270		392		486		532		557		584
2010							27		139		267		414		530		577		608
2011									27		135		253		389		484		534
2012											27		127		233		340		417
2013													33		135		257		377
2014															29		115		245
2015																	31		132
2016																			34
																	Total		$	4,002
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	2,063
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			1,130
Liability for unallocated claim adjustment expenses for accident years presented																			55
Total net liability for unpaid claim and claim adjustment expenses																			$	3,248

Short-Duration Contracts Reserve Development [Table Text Block]

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)			2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total
Accident Year
2007	$	(101	)	$	5		$	(39	)	$	(29	)	$	(10	)	$	(41	)	$	(14	)	$	3		$	(8	)	$	(234	)
2008				(7		)	26			17			(14		)	(1		)	(19		)	(13		)	(9		)	(20		)
2009							46			(3		)	(1		)	(4		)	(6		)	(4		)	3			31
2010										31			2			50			46			(20		)	(16		)	93
2011													(3		)	30			46			1			10			84
2012																24			16			(9		)	(12		)	19
2013																			30			(11		)	9			28
2014																						7			1			8
2015																									1			1
Total net development for the accident years presented above																			$	99		$	(46	)	$	(21	)
Total net development for accident years prior to 2007																			(54		)	13			(7		)
Total																			$	45		$	(33	)	$	(28	)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

Commercial - Workers Compensation [Member]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Short-Duration Contracts Net Incurred Claims and Allocated Claim Adjustment Expenses [Table Text Block]

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	568	$	580	$	596	$	604	$	603	$	603	$	604	$	610	$	608	$	627	$	32	71,049
2008			558		575		593		606		608		612		622		630		638		36		59,883
2009					583		587		594		596		600		611		617		625		46		51,111
2010							576		619		641		663		683		697		717		45		48,056
2011									593		628		637		648		642		666		52		44,571
2012											589		616		648		661		671		86		41,683
2013													528		563		584		610		121		38,102
2014															459		474		474		157		32,996
2015																	416		426		206		31,296
2016																			421		287		27,042
																	Total		$	5,875	$	1,068

Short-Duration Contracts Net Cumulative Paid Claim Adjustment Expenses Reconciliation of Total Liability for Unpaid Claim and Claim Adjustment Expense [Table Text Block]

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	100	$	246	$	337	$	390	$	429	$	471	$	502	$	522	$	533	$	535
2008			92		233		323		381		425		461		489		505		520
2009					88		223		315		381		435		468		495		516
2010							94		245		352		433		500		531		565
2011									97		245		353		432		471		515
2012											86		229		338		411		465
2013													79		211		297		366
2014															60		157		213
2015																	50		130
2016																			52
																	Total		$	3,877
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	1,998
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			2,334
Other (2)																			(30		)
Liability for unallocated claim adjustment expenses for accident years presented																			4
Total net liability for unpaid claim and claim adjustment expenses																			$	4,306

(2) Other includes the effect of discounting lifetime claim reserves.

Short-Duration Contracts Reserve Development [Table Text Block]

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)		2010(1)		2011(1)			2012(1)		2013(1)		2014(1)		2015(1)			2016		Total
Accident Year
2007	$	12	$	16	$	8	$	(1	)	$	—	$	1	$	6	$	(2	)	$	19	$	59
2008			17		18		13			2		4		10		8			8		80
2009					4		7			2		4		11		6			8		42
2010							43			22		22		20		14			20		141
2011										35		9		11		(6		)	24		73
2012												27		32		13			10		82
2013														35		21			26		82
2014																15			—		15
2015																			10		10
Total net development for the accident years presented above														$	125	$	69		$	125
Adjustment for development on a discounted basis														1		(4		)	1
Total net development for accident years prior to 2007														13		15			24
Total														$	139	$	80		$	150

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

International [Member]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Net prior year claim and allocated claim adjustment expense reserve development

The following table presents further detail of the development recorded for the International segment.

Years ended December 31
(In millions)	2016			2015			2014
Pretax (favorable) unfavorable development:
Medical Professional Liability	$	(5	)	$	(9	)	$	(7	)
Other Professional Liability	12			(16		)	(26		)
Liability	(30		)	(17		)	(13		)
Property & Marine	(34		)	(29		)	(4		)
Other	(1		)	17			(9		)
Total pretax (favorable) unfavorable development	$	(58	)	$	(54	)	$	(59	)

Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block]

The table below provides the composition of the net liability for unpaid claim and claim adjustment expenses for the International segment.

As of December 31
(In millions)	2016
Net Claim and claim adjustment expenses:
International excluding Hardy	$	881
Hardy	320
Total net liability for claim and claim adjustment expenses	$	1,201

International Excluding Hardy [Member] [Domain]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Short-Duration Contracts Net Incurred Claims and Allocated Claim Adjustment Expenses [Table Text Block]

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year																				As of December 31, 2016
(In millions, except reported claims data)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016		IBNR		Cumulative Number of Claims
Accident Year
2007	$	204	$	219	$	213	$	194	$	181	$	172	$	164	$	162	$	160	$	159	$	4	27,149
2008			223		226		214		207		207		200		209		210		207		7		25,119
2009					249		245		247		247		234		231		222		213		13		21,362
2010							226		223		217		211		203		196		190		18		22,877
2011									259		260		253		233		223		216		14		25,361
2012											259		266		252		245		244		34		25,306
2013													281		282		275		256		56		23,999
2014															269		284		284		82		24,859
2015																	282		297		107		22,873
2016																			276		149		15,564
																	Total		$	2,342	$	484

Short-Duration Contracts Net Cumulative Paid Claim Adjustment Expenses Reconciliation of Total Liability for Unpaid Claim and Claim Adjustment Expense [Table Text Block]

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2007(1)		2008(1)		2009(1)		2010(1)		2011(1)		2012(1)		2013(1)		2014(1)		2015(1)		2016
Accident Year
2007	$	31	$	99	$	112	$	124	$	133	$	140	$	144	$	148	$	150	$	152
2008			34		84		126		135		143		151		165		172		190
2009					38		90		119		134		149		159		170		181
2010							47		93		115		130		143		151		160
2011									44		111		133		146		159		171
2012											42		109		142		161		176
2013													49		109		135		152
2014															51		119		145
2015																	55		130
2016																			64
Total																			$	1,521
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented																			$	821
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007																			38
Liability for unallocated claim adjustment expenses for accident years presented																			22
Total net liability for unpaid claim and claim adjustment expenses																			$	881

Short-Duration Contracts Reserve Development [Table Text Block]

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2008(1)		2009(1)			2010(1)			2011(1)			2012(1)			2013(1)			2014(1)			2015(1)			2016			Total (2)
Accident Year
2007	$	15	$	(6	)	$	(19	)	$	(13	)	$	(9	)	$	(8	)	$	(2	)	$	(2	)	$	(1	)	$	(45	)
2008			3			(12		)	(7		)	—			(7		)	9			1			(3		)	(16		)
2009						(4		)	2			—			(13		)	(3		)	(9		)	(9		)	(36		)
2010									(3		)	(6		)	(6		)	(8		)	(7		)	(6		)	(36		)
2011												1			(7		)	(20		)	(10		)	(7		)	(43		)
2012															7			(14		)	(7		)	(1		)	(15		)
2013																		1			(7		)	(19		)	(25		)
2014																					15			—			15
2015																								15			15

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

(2) The amounts included in the loss reserve development tables above are presented at the year-end 2016 foreign currency exchange rates for all periods presented to remove the effects of foreign currency exchange rate fluctuations between calendar years. The amounts included within the table on page 102 presenting the detail of the development recorded within the International segment include the impact of fluctuations in foreign currency exchange rates.

Hardy [Member]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Short-Duration Contracts Net Incurred Claims and Allocated Claim Adjustment Expenses [Table Text Block]

Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31								Calendar Year										As of December 31, 2016
(In millions, except reported claims data)	Net Claim and Allocated Claim Adjustment Expense Reserves at Acquisition		Net Incurred Claim and Allocated Claim Adjustment Expenses in 2012(1)(2)			Total Acquired Net Claim and Allocated Claim Adjustment Expense Reserves and 2012 Incurreds		2013(1)		2014(1)			2015(1)		2016			IBNR			Cumulative Number of Claims
Accident Year
2007	$	5	$	7		$	12	$	11	$	16		$	10	$	15		$	—		4,249
2008	18		(4		)	14		11		12			13		13			—			4,234
2009	11		1			12		6		(4		)	1		(2		)	—			3,840
2010	46		(10		)	36		46		50			44		50			—			4,495
2011	121		—			121		130		130			134		132			(2		)	6,193
2012	33		69			102		102		110			117		110			(1		)	6,758
2013								127		144			136		137			—			7,392
2014										182			180		174			7			7,656
2015													187		176			18			7,669
2016															225			101			5,274
													Total		$	1,030		$	123

Short-Duration Contracts Net Cumulative Paid Claim Adjustment Expenses Reconciliation of Total Liability for Unpaid Claim and Claim Adjustment Expense [Table Text Block]

Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.

As of December 31	Calendar Year
(In millions)	2012(1)(2)		2013(1)			2014(1)			2015(1)			2016
Accident Year
2007	$	3	$	14		$	14		$	14		$	14
2008	3		14			10			10			11
2009	1		(2		)	(4		)	(4		)	(4		)
2010	19		34			41			43			45
2011	29		80			119			123			127
2012	14		78			98			107			104
2013			37			100			119			125
2014						55			121			139
2015									29			97
2016												62
Total												$	720
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented												$	310
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2007												3
Liability for unallocated claim adjustment expenses for accident years presented												7
Total net liability for unpaid claim and claim adjustment expenses												$	320

Short-Duration Contracts Reserve Development [Table Text Block]

Net strengthening or (releases) of prior accident year reserves is presented in the following table.

For the years ended December 31	Calendar Year
(In millions)	2012(1)(2)			2013(1)			2014(1)			2015(1)			2016			Total (3)
Accident Year
2007	$	7		$	(1	)	$	5		$	(6	)	$	5		$	10
2008	(4		)	(3		)	1			1			—			(5		)
2009	1			(6		)	(10		)	5			(3		)	(13		)
2010	(10		)	10			4			(6		)	6			4
2011	—			9			—			4			(2		)	11
2012				—			8			7			(7		)	8
2013							17			(8		)	1			10
2014										(2		)	(6		)	(8		)
2015													(11		)	(11		)

(1) Data presented for these calendar years is required supplemental information, which is unaudited.

(2) Data presented for this calendar year is post-acquisition of Hardy.

(3) The amounts included in the loss reserve development tables above are presented at the year-end 2016 foreign currency exchange rates for all periods presented to remove the effects of foreign currency exchange rate fluctuations between calendar years. The amounts included within the table on page 102 presenting the detail of the development recorded within the International segment include the impact of fluctuations in foreign currency exchange rates.

CNAF Consolidated [Member]

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block]

The table below reconciles the net liability for unpaid claim and claim adjustment expenses for the property and casualty segments to the amount presented in the Consolidated Balance Sheets.

As of December 31
(In millions)	2016
Net liability for unpaid claim and claim adjustment expenses
Specialty	$	5,404
Commercial	8,305
International	1,201
Corporate & Other Non-Core	230
Life & Group Non-Core (1)	3,109
Total net claim and claim adjustment expenses	18,249
Reinsurance receivables (2)
Specialty	745
Commercial	589
International	127
Corporate & Other Non-Core	2,384
Life & Group Non-Core	249
Total reinsurance receivables	4,094
Total gross liability for unpaid claim and claim adjustment expenses	$	22,343

(1) The Life & Group Non-Core segment amount is primarily related to long term care claim reserves, but does include amounts related to unfunded structured settlements arising from short duration contracts. Long term care policies are long duration contracts.

(2) Reinsurance receivables presented do not include reinsurance receivables related to paid losses.

Short-duration Insurance Contracts, Schedule of Historical Claims Duration [Table Text Block]

The table below presents information about average historical claims duration as of December 31, 2016 and is presented as required supplementary information, which is unaudited.

Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses in Year:
	1		2		3		4		5		6		7		8		9		10		Total
Specialty
Medical Professional Liability	3.1	%	18.2	%	22.3	%	19.6	%	12.7	%	8.0	%	5.0	%	4.8	%	3.7	%	0.3	%	97.7	%
Other Professional Liability and Management Liability	5.7	%	20.6	%	21.0	%	17.0	%	10.0	%	6.3	%	5.6	%	3.8	%	1.9	%	3.2	%	95.1	%
Surety(1)	23.4	%	32.8	%	20.2	%	8.9	%	3.7	%	1.5	%	(0.7	)%	2.0	%	1.0	%	2.0	%	94.8	%
Commercial
Commercial Auto	27.2	%	23.1	%	18.3	%	13.9	%	9.1	%	3.9	%	1.3	%	0.2	%	0.3	%	0.3	%	97.6	%
General Liability	5.0	%	16.3	%	20.5	%	20.1	%	15.3	%	8.0	%	4.2	%	2.7	%	1.1	%	1.3	%	94.5	%
Workers' Compensation	13.5	%	21.4	%	14.6	%	10.5	%	7.5	%	5.7	%	4.6	%	3.0	%	2.1	%	0.3	%	83.2	%
International
International - Excluding Hardy	19.5	%	27.4	%	12.1	%	6.8	%	5.9	%	4.5	%	4.8	%	3.7	%	5.0	%	1.3	%	91.0	%
International - Hardy (2)	25.7	%	40.9	%	12.1	%	4.4	%													83.1	%

(1) Due to the nature of the Surety business, average annual percentage payout of ultimate net incurred claim and allocated claim adjustment expenses has been calculated using only the payouts of mature accident years presented in the loss reserve development tables.

(2) Average historical claims duration for Hardy is presented prospectively beginning with the first full year subsequent to acquisition, 2013.

Impact of loss portfolio transfer on the consolidated statement of operations

The following table presents the impact of the Loss Portfolio Transfer on the Consolidated Statements of Operations.

Years ended December 31
(In millions)	2016			2015			2014
Net A&EP adverse development before consideration of LPT	$	200		$	150		$	—
Retroactive reinsurance benefit recognized	(107		)	(85		)	(13		)
Pretax impact of A&EP reserve development and the LPT	$	93		$	65		$	(13	)

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Reinsurance (Tables)

12 Months Ended

Dec. 31, 2016

Reinsurance Disclosures [Abstract]

Components of Reinsurance Receivables

The following table presents the amounts receivable from reinsurers.

December 31
(In millions)	2016			2015
Reinsurance receivables related to insurance reserves:
Ceded claim and claim adjustment expenses	$	4,094		$	4,087
Ceded future policy benefits	212			207
Reinsurance receivables related to paid losses	147			197
Reinsurance receivables	4,453			4,491
Allowance for uncollectible reinsurance	(37		)	(38		)
Reinsurance receivables, net of allowance for uncollectible reinsurance	$	4,416		$	4,453

Components of Earned and Written Premiums

The effects of reinsurance on earned premiums and written premiums are presented in the following tables.

(In millions)	Direct		Assumed		Ceded		Net		Assumed/ Net %
2016 Earned Premiums
Property and casualty	$	10,400	$	258	$	4,270	$	6,388	4.0	%
Long term care	486		50		—		536		9.3	%
Total earned premiums	$	10,886	$	308	$	4,270	$	6,924	4.4	%
2015 Earned Premiums
Property and casualty	$	9,853	$	274	$	3,754	$	6,373	4.3	%
Long term care	498		50		—		548		9.1	%
Total earned premiums	$	10,351	$	324	$	3,754	$	6,921	4.7	%
2014 Earned Premiums
Property and casualty	$	9,452	$	277	$	3,073	$	6,656	4.2	%
Long term care	508		48		—		556		8.6	%
Total earned premiums	$	9,960	$	325	$	3,073	$	7,212	4.5	%

(In millions)	Direct		Assumed		Ceded		Net		Assumed/ Net %
2016 Written Premiums
Property and casualty	$	10,451	$	245	$	4,255	$	6,441	3.8	%
Long term care	495		52		—		547		9.5	%
Total written premiums	$	10,946	$	297	$	4,255	$	6,988	4.3	%
2015 Written Premiums
Property and casualty	$	9,852	$	270	$	3,702	$	6,420	4.2	%
Long term care	493		49		—		542		9.0	%
Total written premiums	$	10,345	$	319	$	3,702	$	6,962	4.6	%
2014 Written Premiums
Property and casualty	$	9,283	$	276	$	3,024	$	6,535	4.2	%
Long term care	504		49		—		553		8.9	%
Total written premiums	$	9,787	$	325	$	3,024	$	7,088	4.6	%

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Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Schedule of debt instruments

Debt is composed of the following obligations.

December 31
(In millions)	2016		2015
Short term debt:
Senior notes of CNAF, 6.500%, face amount of $350, due August 15, 2016	$	—	$	350
Long term debt:
Senior notes of CNAF:
6.950%, face amount of $150, due January 15, 2018	150		150
7.350%, face amount of $350, due November 15, 2019	349		349
5.875%, face amount of $500, due August 15, 2020	498		497
5.750%, face amount of $400, due August 15, 2021	398		397
3.950%, face amount of $550, due May 15, 2024	546		546
4.500%, face amount of $500, due March 1, 2026	498		—
Debenture of CNAF, 7.250%, face amount of $243, due November 15, 2023	241		241
Subordinated variable rate debt of Hardy, face amount of $30, due September 15, 2036	30		30
Total long term debt	2,710		2,210
Total debt	$	2,710	$	2,560

Maturity of debt

The combined aggregate maturities for debt as of December 31, 2016 are presented in the following table.

(In millions)
2017	$	—
2018	150
2019	350
2020	500
2021	400
Thereafter	1,323
Less discount	(13		)
Total	$	2,710

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Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Funded status

The following table presents a reconciliation of benefit obligations and plan assets.

	Pension Benefits						Postretirement Benefits
(In millions)	2016			2015			2016			2015
Benefit obligation as of January 1	$	2,821		$	3,019		$	23		$	29
Changes in benefit obligation:
Service cost	—			4			—			—
Interest cost	113			112			—			1
Participants' contributions	—			—			4			4
Plan amendments	—			(55		)	—			—
Actuarial (gain) loss	68			(79		)	(6		)	(3		)
Benefits paid	(173		)	(173		)	(7		)	(8		)
Foreign currency translation and other	(14		)	(7		)	1			—
Settlement through group annuity purchase	(86		)	—			—			—
Benefit obligation as of December 31	2,729			2,821			15			23
Fair value of plan assets as of January 1	2,267			2,456			—			—
Change in plan assets:
Actual return on plan assets	193			(18		)	—			—
Company contributions	9			10			3			4
Participants' contributions	—			—			4			4
Benefits paid	(173		)	(173		)	(7		)	(8		)
Foreign currency translation and other	(15		)	(8		)	—			—
Settlement through group annuity purchase	(88		)	—			—			—
Fair value of plan assets as of December 31	2,193			2,267			—			—
Funded status	$	(536	)	$	(554	)	$	(15	)	$	(23	)
Amounts recognized on the Consolidated Balance Sheets as of December 31:
Other assets	$	4		$	12		$	—		$	—
Other liabilities	(540		)	(566		)	(15		)	(23		)
Net amount recognized	$	(536	)	$	(554	)	$	(15	)	$	(23	)
Amounts recognized in Accumulated other comprehensive income, not yet recognized in net periodic cost (benefit):
Prior service credit	$	—		$	—		$	(4	)	$	(6	)
Net actuarial loss	999			999			(3		)	3
Net amount recognized	$	999		$	999		$	(7	)	$	(3	)

Components of net periodic cost (benefit)

The components of net periodic cost (benefit) are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Pension cost (benefit)
Service cost	$	—		$	4		$	9
Interest cost on projected benefit obligation	113			112			132
Expected return on plan assets	(160		)	(174		)	(191		)
Amortization of net actuarial loss	37			34			25
Settlement loss	—			—			84
Net periodic pension cost (benefit)	$	(10	)	$	(24	)	$	59
Postretirement cost (benefit)
Interest cost on projected benefit obligation	$	—		$	1		$	1
Amortization of prior service credit	(2		)	(3		)	(10		)
Amortization of net actuarial loss	—			1			1
Curtailment gain	—			—			(86		)
Net periodic postretirement cost (benefit)	$	(2	)	$	(1	)	$	(94	)

Schedule of amounts recognized in Other comprehensive income

The amounts recognized in Other comprehensive income are presented in the following table.

Years ended December 31
(In millions)	2016			2015			2014
Pension and postretirement benefits
Amounts arising during the period	$	(29	)	$	(111	)	$	(337	)
Curtailment and other	—			56			(81		)
Settlement	—			—			84
Reclassification adjustment relating to prior service credit	(2		)	(3		)	(10		)
Reclassification adjustment relating to actuarial loss	37			35			26
Settlement through group annuity purchase	(2		)	—			—
Total increase (decrease) in Other comprehensive income	$	4		$	(23	)	$	(318	)

Schedule of estimated amounts to be recognized from Accumulated other comprehensive income into net periodic cost (benefit) during next fiscal year

The table below presents the estimated amounts to be recognized from AOCI into net periodic cost (benefit) during 2017.

(In millions)	Pension Benefits		Postretirement Benefits
Amortization of prior service credit	$	—	$	(2	)
Amortization of net actuarial loss	36		—
Total estimated amounts to be recognized	$	36	$	(2	)

Actuarial assumptions for benefit obligations and for net cost or benefit

Actuarial assumptions used for the CNA Retirement Plan and CNA Health and Group Benefits Program to determine benefit obligations are presented in the following table.

December 31	2016		2015
Pension benefits
Discount rate	3.950	%	4.150	%
Expected long term rate of return	7.500		7.500
Postretirement benefits
Discount rate	2.750	%	2.750	%

Actuarial assumptions used for the CNA Retirement Plan and CNA Health and Group Benefits Program to determine net cost or benefit are presented in the following table.

Years ended December 31	2016		2015		2014
Pension benefits
Discount rate	4.150	%	3.850%/4.000%		4.650	%
Expected long term rate of return	7.500		7.500		7.500
Rate of compensation increases	N/A		3.920		3.990
Postretirement benefits
Discount rate	2.750	%	2.500	%	3.600%/3.100%

Fair value of plan assets measured on a recurring basis

Pension plan assets measured at fair value on a recurring basis as well as cash are presented in the following tables.

December 31, 2016
(In millions)	Level 1		Level 2		Level 3		Total
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	500	$	10	$	510
States, municipalities and political subdivisions	—		63		—		63
Asset-backed:
Residential mortgage-backed	—		109		—		109
Commercial mortgage-backed	—		66		—		66
Other asset-backed	—		4		—		4
Total asset-backed	—		179		—		179
Total fixed maturity securities	—		742		10		752
Equity securities	363		105		—		468
Derivative financial instruments	—		—		—		—
Short term investments	11		35		—		46
Other assets	—		37		—		37
Cash	14		—		—		14
Total assets measured at fair value	$	388	$	919	$	10	1,317
Total limited partnerships measured at net asset value (1)							876
Total plan assets							$	2,193

December 31, 2015
(In millions)	Level 1		Level 2		Level 3		Total Assets
Assets
Fixed maturity securities:
Corporate and other bonds	$	—	$	455	$	10	$	465
States, municipalities and political subdivisions	—		106		—		106
Asset-backed:
Residential mortgage-backed	—		133		—		133
Commercial mortgage-backed	—		69		—		69
Other asset-backed	—		11		—		11
Total asset-backed	—		213		—		213
Total fixed maturity securities	—		774		10		784
Equity securities	336		107		—		443
Derivative financial instruments	1		—		—		1
Short term investments	24		28		—		52
Other assets	—		52		—		52
Total assets measured at fair value	$	361	$	961	$	10	1,332
Total limited partnerships measured at net asset value (1)							935
Total plan assets							$	2,267

(1) In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.

Reconciliation of level 3 plan assets

The tables below present a reconciliation for all pension plan assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

Level 3 (In millions)	Balance as of January 1, 2016		Actual return on assets still held as of December 31, 2016		Actual return on assets sold during the year ended December 31, 2016		Purchases, sales and settlements		Net transfers into (out of) Level 3		Balance as of December 31, 2016
Fixed maturity securities:
Corporate and other bonds	$	10	$	—	$	—	$	—	$	—	$	10
Total	$	10	$	—	$	—	$	—	$	—	$	10

Level 3 (In millions)	Balance as of January 1, 2015		Actual return on assets still held as of December 31, 2015		Actual return on assets sold during the year ended December 31, 2015		Purchases, sales and settlements		Net transfers into (out of) Level 3			Balance as of December 31, 2015
Fixed maturity securities:
Corporate and other bonds	$	15	$	—	$	—	$	—	$	(5	)	$	10
Total	$	15	$	—	$	—	$	—	$	(5	)	$	10

Estimated future minimum benefit payments to participants

The table below presents the estimated future minimum benefit payments to participants as of December 31, 2016.

(In millions)	Pension Benefits		Postretirement Benefits
2017	$	178	$	3
2018	178		2
2019	177		2
2020	178		2
2021	178		2
2022-2026	883		3

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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Restricted shares, performance-based restricted share units and performance share unit activity

The following table presents activity for non-vested RSUs, performance-based RSUs and performance share units under the Plan in 2016.

	Number of Awards		Weighted-Average Grant Date Fair Value
Balance as of January 1, 2016	735,263		$	36.53
Awards granted	2,545,624		32.27
Awards vested	(371,443	)	33.33
Awards forfeited, canceled or expired	(186,932	)	32.80
Performance-based adjustment	(590,730	)	33.10
Balance as of December 31, 2016	2,131,782		$	33.28

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Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Intangible Assets, Gross (Excluding Goodwill) [Abstract]

Schedule of Other Intangible Assets

Other intangible assets are presented in the following table.

December 31		2016				2015
(In millions)	Economic Useful Life	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Value of business acquired	1 - 4 years	$	48	$	48	$	57	$	57
Trade name	8 years	6		3		7		3
Distribution channel	15 years	10		3		12		3
Total finite-lived intangible assets		64		54		76		63
Indefinite-lived intangible assets:
Syndicate capacity		43				52
Agency force		16				16
Total indefinite-lived intangible assets		59				68
Total other intangible assets		$	123	$	54	$	144	$	63

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Operating Leases (Tables)

12 Months Ended

Dec. 31, 2016

Leases, Operating [Abstract]

Future minimum lease payments

The table below presents the expected future minimum lease payments to be made under non-cancelable operating leases as of December 31, 2016.

(In millions)	Future Minimum Lease Payments
2017	$	48
2018	37
2019	30
2020	33
2021	34
Thereafter	244
Total	$	426

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Stockholders' Equity and Statutory Accounting Practices (Tables)

12 Months Ended

Dec. 31, 2016

Stockholders' Equity and Statutory Accounting Practices [Abstract]

Combined statutory capital and surplus and net income (loss)

Combined statutory capital and surplus and statutory net income (loss), determined in accordance with accounting practices prescribed or permitted by insurance and/or other regulatory authorities for the Combined Continental Casualty Companies, are presented in the table below.

	Statutory Capital and Surplus				Statutory Net Income (Loss)
	December 31				Years ended December 31
(In millions)	2016 (1)		2015		2016 (1)		2015		2014
Combined Continental Casualty Companies	$	10,748	$	10,723	$	1,033	$	1,148	$	914

(1) Information derived from the statutory-basis financial statements to be filed with insurance regulators.

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Accumulated Other Comprehensive Income (Loss) by Component (Tables)

12 Months Ended

Dec. 31, 2016

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss) by Component

The table below displays the changes in Accumulated other comprehensive income (loss) by component.

(In millions)	Net unrealized gains (losses) on investments with OTTI losses		Net unrealized gains (losses) on other investments		Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of December 31, 2015	$	27	$	390	$	(648	)	$	(84	)	$	(315	)
Other comprehensive income (loss) before reclassifications	9		290		(22		)	(114		)	163
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $(3), $(16), $12, $- and $(7)	6		38		(23		)	—			21
Other comprehensive income (loss) net of tax (expense) benefit of $(1), $(117), $(3), $- and $(121)	3		252		1			(114		)	142
Balance as of December 31, 2016	$	30	$	642	$	(647	)	$	(198	)	$	(173	)

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments			Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of December 31, 2014	$	36		$	942		$	(633	)	$	55		$	400
Other comprehensive income (loss) before reclassifications	(23		)	(595		)	(36		)	(139		)	(793		)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $8, $30, $11, $- and $49	(14		)	(43		)	(21		)	—			(78		)
Other comprehensive income (loss) net of tax (expense) benefit of $5, $282, $8, $- and $295	(9		)	(552		)	(15		)	(139		)	(715		)
Balance as of December 31, 2015	$	27		$	390		$	(648	)	$	(84	)	$	(315	)

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Business Segments (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Significant components of the Company's continuing operations and selected balance sheet items

The Company's results of continuing operations and selected balance sheet items by segment are presented in the following tables.

Year ended December 31, 2016	Specialty			Commercial			International			Life & Group Non-Core			Corporate & Other Non-Core
(In millions)																Eliminations			Total
Net written premiums	$	2,780		$	2,841		$	821		$	547		$	—		$	(1	)	$	6,988
Operating revenues
Net earned premiums	$	2,779		$	2,804		$	806		$	536		$	—		$	(1	)	$	6,924
Net investment income	516			638			51			767			16			—			1,988
Other revenues	362			32			—			(2		)	12			—			404
Total operating revenues	3,657			3,474			857			1,301			28			(1		)	9,316
Claims, Benefits and Expenses
Net incurred claims and benefits	1,467			1,927			492			1,286			98			—			5,270
Policyholders’ dividends	4			9			—			—			—			—			13
Amortization of deferred acquisition costs	591			470			174			—			—			—			1,235
Other insurance related expenses	301			560			133			132			(3		)	(1		)	1,122
Other expenses	312			36			24			8			209			—			589
Total claims, benefits and expenses	2,675			3,002			823			1,426			304			(1		)	8,229
Operating income (loss) before income tax	982			472			34			(125		)	(276		)	—			1,087
Income tax (expense) benefit on operating income (loss)	(332		)	(161		)	(13		)	145			98			—			(263		)
Net operating income (loss)	650			311			21			20			(178		)	—			824
Net realized investment gains (losses)	5			4			18			25			(2		)	—			50
Income tax (expense) benefit on net realized investment gains (losses)	(2		)	(2		)	(3		)	(9		)	1			—			(15		)
Net realized investment gains (losses), after tax	3			2			15			16			(1		)	—			35
Net income (loss) from continuing operations	$	653		$	313		$	36		$	36		$	(179	)	$	—		$	859

December 31, 2016
(In millions)
Reinsurance receivables	$	760	$	621	$	131	$	462	$	2,479	$	—	$	4,453
Insurance receivables	982		1,021		233		17		2		—		2,255
Deferred acquisition costs	310		214		76		—		—		—		600
Goodwill	117		—		28		—		—		—		145
Insurance reserves
Claim and claim adjustment expenses	6,149		8,894		1,328		3,358		2,614		—		22,343
Unearned premiums	1,911		1,323		396		132		—		—		3,762
Future policy benefits	—		—		—		10,326		—		—		10,326

Year ended December 31, 2015	Specialty			Commercial			International			Life & Group Non-Core			Corporate & Other Non-Core
(In millions)																Eliminations			Total
Net written premiums	$	2,781		$	2,818		$	822		$	542		$	1		$	(2	)	$	6,962
Operating revenues
Net earned premiums	$	2,782		$	2,788		$	804		$	548		$	1		$	(2	)	$	6,921
Net investment income	474			593			52			704			17			—			1,840
Other revenues	356			37			(1		)	7			11			(3		)	407
Total operating revenues	3,612			3,418			855			1,259			29			(5		)	9,168
Claims, Benefits and Expenses
Net incurred claims and benefits	1,597			1,814			479			1,421			61			—			5,372
Policyholders’ dividends	4			8			—			—			—			—			12
Amortization of deferred acquisition costs	589			469			168			314			—			—			1,540
Other insurance related expenses	278			538			138			142			(1		)	(2		)	1,093
Other expenses	301			28			12			11			186			(3		)	535
Total claims, benefits and expenses	2,769			2,857			797			1,888			246			(5		)	8,552
Operating income (loss) before income tax	843			561			58			(629		)	(217		)	—			616
Income tax (expense) benefit on operating income (loss)	(283		)	(192		)	(21		)	315			80			—			(101		)
Net operating income (loss)	560			369			37			(314		)	(137		)	—			515
Net realized investment gains (losses)	(33		)	(47		)	1			(1		)	13			—			(67		)
Income tax (expense) benefit on net realized investment gains (losses)	11			16			—			9			(5		)	—			31
Net realized investment gains (losses), after tax	(22		)	(31		)	1			8			8			—			(36		)
Net income (loss) from continuing operations	$	538		$	338		$	38		$	(306	)	$	(129	)	$	—		$	479

December 31, 2015
(In millions)
Reinsurance receivables	$	724	$	639	$	144	$	497	$	2,487	$	—	$	4,491
Insurance receivables	890		993		233		11		2		—		2,129
Deferred acquisition costs	307		213		78		—		—		—		598
Goodwill	117		—		33		—		—		—		150
Insurance reserves
Claim and claim adjustment expenses	6,269		9,183		1,347		3,220		2,644		—		22,663
Unearned premiums	1,839		1,297		415		120		—		—		3,671
Future policy benefits	—		—		—		10,152		—		—		10,152

Year ended December 31, 2014	Specialty			Commercial						Life & Group Non-Core			Corporate & Other Non-Core
(In millions)							International									Eliminations			Total
Net written premiums	$	2,839		$	2,817		$	880		$	553		$	1		$	(2	)	$	7,088
Operating revenues
Net earned premiums	$	2,838		$	2,906		$	913		$	556		$	1		$	(2	)	$	7,212
Net investment income	560			723			61			700			23			—			2,067
Other revenues	295			38			—			16			12			(5		)	356
Total operating revenues	3,693			3,667			974			1,272			36			(7		)	9,635
Claims, Benefits and Expenses
Net incurred claims and benefits	1,627			2,187			488			1,304			(29		)	—			5,577
Policyholders’ dividends	6			8			—			—			—			—			14
Amortization of deferred acquisition costs	592			493			204			28			—			—			1,317
Other insurance related expenses	262			487			151			130			1			(2		)	1,029
Other expenses	254			31			28			30			210			(5		)	548
Total claims, benefits and expenses	2,741			3,206			871			1,492			182			(7		)	8,485
Operating income (loss) before income tax	952			461			103			(220		)	(146		)	—			1,150
Income tax (expense) benefit on operating income (loss)	(318		)	(154		)	(34		)	151			54			—			(301		)
Net operating income (loss)	634			307			69			(69		)	(92		)	—			849
Net realized investment gains (losses)	15			16			(1		)	7			20			—			57
Income tax (expense) benefit on net realized investment gains (losses)	(5		)	(6		)	1			—			(8		)	—			(18		)
Net realized investment gains (losses), after tax	10			10			—			7			12			—			39
Net income (loss) from continuing operations	$	644		$	317		$	69		$	(62	)	$	(80	)	$	—		$	888

Revenues by line of business

The following table presents revenue by line of business for each reportable segment. Revenues are comprised of operating revenues and net realized investment gains and losses.

Years ended December 31
(In millions)	2016			2015			2014
Specialty
Management & Professional Liability	$	2,620		$	2,617		$	2,818
Surety	532			502			509
Warranty & Alternative Risks	510			460			381
Specialty revenues	3,662			3,579			3,708
Commercial
Middle Market	1,769			1,623			1,631
Small Business	583			616			709
Other Commercial Insurance	1,126			1,132			1,343
Commercial revenues	3,478			3,371			3,683
International
Canada	203			214			273
CNA Europe	319			309			335
Hardy	353			333			365
International revenues	875			856			973
Life & Group Non-Core revenues	1,326			1,258			1,279
Corporate & Other Non-Core revenues	26			42			56
Eliminations	(1		)	(5		)	(7		)
Total revenues	$	9,366		$	9,101		$	9,692

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Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2016

Discontinued Operations and Disposal Groups [Abstract]

Results of discontinued operations

The results of discontinued operations reflected in the Consolidated Statements of Operations were as follows:

Year ended December 31
(In millions)	2014
Revenues
Net earned premiums	$	—
Net investment income	94
Net realized investment gains	3
Other revenues	—
Total revenues	97
Claims, Benefits and Expenses
Insurance claims and policyholders' benefits	75
Other operating expenses	2
Total claims, benefits and expenses	77
Income before income tax	20
Income tax expense	(6		)
Income from operations of discontinued operations, net of income tax	14
Loss on sale, net of income tax benefit of $40	(211		)
Loss from discontinued operations	$	(197	)

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Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Data [Abstract]

Schedule of quarterly financial information

The following tables present unaudited quarterly financial data.

2016
(In millions, except per share data)	First		Second		Third		Fourth		Full Year
Revenues	$	2,195	$	2,348	$	2,433	$	2,390	$	9,366
Net income (loss) (1)	$	66	$	209	$	343	$	241	$	859
Basic earnings (loss) per share	$	0.25	$	0.77	$	1.27	$	0.89	$	3.18
Diluted earnings (loss) per share	$	0.24	$	0.77	$	1.26	$	0.89	$	3.17

2015
(In millions, except per share data)	First		Second		Third		Fourth			Full Year
Revenues	$	2,352	$	2,327	$	2,153	$	2,269		$	9,101
Net income (loss) (1) (2)	$	233	$	138	$	178	$	(70	)	$	479
Basic earnings (loss) per share	$	0.86	$	0.51	$	0.66	$	(0.26	)	$	1.77
Diluted earnings (loss) per share	$	0.86	$	0.51	$	0.66	$	(0.26	)	$	1.77

(1) Net income (loss) in the first quarter of 2016 and the second quarter of 2015 included a charge related to the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer in our Corporate & Other Non-Core segment.

(2) Net income (loss) in the fourth quarter of 2015 included a charge related to recognition of a premium deficiency in our long term care business.

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Organization Review (Tables)

12 Months Ended

Dec. 31, 2016

Restructuring and Related Activities [Abstract]

Restructuring and Related Costs [Table Text Block]

The costs by reportable segment for the year ended December 31, 2016, are presented in the following table.

Year ended December 31
(In millions)	2016
Specialty	$	4
Commercial	14
International	—
Life & Group Non-Core	1
Corporate & Other Non-Core	—
Total organization review costs	$	19

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Schedule II. Condensed Financial Information of Registrant (Parent Company) Schedule II. Condensed Financial Information of Registrant (Parent Company)

12 Months Ended

Dec. 31, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Statement of Comprehensive Income [Table Text Block]

CNA Financial Corporation

Statements of Operations and Comprehensive Income (Loss)

Years ended December 31
(In millions)	2016			2015			2014
Revenues
Net investment income	$	3		$	1		$	1
Net realized investment (losses) gains	(7		)	5			4
Total revenues	(4		)	6			5
Expenses
Administrative and general	1			1			5
Interest	155			154			182
Total expenses	156			155			187
Loss from operations before income taxes and equity in net income of subsidiaries	(160		)	(149		)	(182		)
Income tax benefit	41			34			35
Loss before equity in net income of subsidiaries	(119		)	(115		)	(147		)
Equity in net income of subsidiaries	978			594			838
Net income	859			479			691
Equity in other comprehensive income of subsidiaries	142			(715		)	(42		)
Total Comprehensive Income (Loss)	$	1,001		$	(236	)	$	649

Condensed Balance Sheet [Table Text Block]

CNA Financial Corporation

Balance Sheets

December 31
(In millions, except share data)	2016			2015
Assets
Investment in subsidiaries	$	14,202		$	13,851
Cash	1			4
Short term investments	487			478
Amounts due from affiliates	6			—
Other assets	1			1
Total assets	$	14,697		$	14,334
Liabilities
Short term debt	$	—		$	350
Long term debt	2,680			2,180
Other liabilities	48			48
Total liabilities	2,728			2,578
Stockholders' Equity
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,495,998 and 270,274,361 shares outstanding)	683			683
Additional paid-in capital	2,173			2,153
Retained earnings	9,359			9,313
Accumulated other comprehensive income	(173		)	(315		)
Treasury stock (2,544,245 and 2,765,882 shares), at cost	(73		)	(78		)
Total stockholders' equity	11,969			11,756
Total liabilities and stockholders' equity	$	14,697		$	14,334

Condensed Cash Flow Statement [Table Text Block]

CNA Financial Corporation

Statements of Cash Flows

Years ended December 31
(In millions)	2016			2015			2014
Cash Flows from Operating Activities
Net income	$	859		$	479		$	691
Adjustments to reconcile net income to net cash flows provided by operating activities:
Equity in net income of subsidiaries	(978		)	(594		)	(838		)
Dividends received from subsidiaries	765			900			650
Net realized investment losses (gains)	7			(5		)	(4		)
Other, net	21			4			14
Total adjustments	(185		)	305			(178		)
Net cash flows provided by operating activities	674			784			513
Cash Flows from Investing Activities
Change in short term investments	(9		)	21			6
Capital contributions to subsidiaries	—			—			(10		)
Other, net	4			7			5
Net cash flows (used) provided by investing activities	(5		)	28			1
Cash Flows from Financing Activities
Dividends paid to common stockholders	(813		)	(811		)	(541		)
Proceeds from the issuance of debt	498			—			546
Repayment of debt	(358		)	—			(549		)
Stock options exercised	—			1			5
Other, net	1			1			25
Net cash flows used by financing activities	(672		)	(809		)	(514		)
Net change in cash	(3		)	3			—
Cash, beginning of year	4			1			1
Cash, end of year	$	1		$	4		$	1

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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss on reinsurance transaction			$ 34
Anticipated amounts due from insureds related to losses under deductible policies	$ 1,200	$ 1,200
Structured Settlement Annuities, Interest Rate, Low End	5.50%	5.50%
Structured Settlement Annuities, Interest Rates, High End	8.00%	8.00%
Discounted reserves for unfunded structured settlements	$ 544	$ 560
Discounted reserves for unfunded structure settlements, discount amount	841	880
Amount of interest recognized on the discounted reserves of unfunded structured settlements	$ 42	$ 42	43
Interest rates at which workers' compensation lifetime claim reserves are discounted at	3.50%	3.50%
Workers' Compensation Liability	$ 371	$ 396
Discounted reserves for workers’ compensation lifetime claim reserves, discount amount	202	218
Amount of interest accretion recognized on the discounted reserves of workers’ compensation lifetime claim reserves	$ 17	$ 20	22
Minimum interest rate used to discount long term care claim reserves	4.50%	4.50%
Maximum interest rate used to discount long term care claim reserves	6.80%	6.80%
Discounted reserves for long term care claim reserves	$ 2,200	$ 2,200
Discounted reserves for long term care claim reserves, discount amount	$ 529	435
Long term care premium deficiency		296
Write off of deferred acquisition cost asset due to long term care premium deficiency		289
Adjustment to Active life reserves due to premium deficiency		7
Minimum interest rate used to calculate reserves for long term care products	6.60%
Maximum interest rate used to calculate reserves for long term care products	7.00%
Liability balance for guaranty fund	$ 125	129
Percentage of billed receivables compared to total reinsurance receivables	3% or less
Deposit assets	$ 3	3
Deposit liabilities	6	8
Loss on life settlement contracts, held for sale	10
Investments in life settlement contracts	58	74
Increase in fair value recognized on life settlement contracts	7	1	8
Gain recognized on matured life settlement contracts	8	24	25
Decreased Net Investment Income and amortized cost of fixed maturity securities due to a change in estimate effected by a change in accounting principle		39
Decreased Net Investment Income and amortized cost of fixed maturity securities due to a change in estimate effected by a change in accounting principle relating to 2014 and prior		$ 22
Decrease of Basic and Diluted Earnings per Share due to change in estimate effected by a change in accounting principle		$ 0.09
Decrease in shadow adjustment, net of tax	97	$ 177
Reduction of net unrealized gains on investments included in AOCI due to shadow adjustments	1,014	1,111
Foreign currency transaction gain (loss), before tax	$ (9)	$ (11)	$ (25)
Weighted average number diluted shares outstanding adjustment	678	534	675
Antidilutive securities excluded from computation of earnings per share, amount	102	106	170
Interest paid, net	$ 157	$ 152	$ 179
Income taxes paid	170	310	$ 313
Cumulative Effect of New Accounting Principle in Period of Adoption on Long Term Debt		(2)
Cumulative Effect of New Accounting Principle in Period of Adoption on Other Assets		(2)
Other Invested Assets Overseas Deposit	31	27
Limited partnership investments	$ 2,371	2,548
Furniture and Fixtures [Member]
Property, Plant and Equipment, Useful Life	7 years
Office Equipment [Member]
Property, Plant and Equipment, Useful Life	5 years
Building and Building Improvements [Member]
Property, Plant and Equipment, Useful Life	50 years
Minimum [Member]
Requisite service period for stock- based compensation expense	3 years
Minimum [Member] | Computer Software, Intangible Asset [Member]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member]
Requisite service period for stock- based compensation expense	4 years
Maximum [Member] | Computer Software, Intangible Asset [Member]
Property, Plant and Equipment, Useful Life	10 years
Pension Plans, Defined Benefit [Member]
Limited partnership investments	$ 876	$ 935

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Summary of Significant Accounting Policies (Life Settlement Contracts) (Details) $ in Millions	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Life Settlement Contracts, Fair Value Method, Number of Contracts, Fiscal Year Maturity [Abstract]
Life settlement contracts, fair value method, number of contracts, maturing in next twelve months	63
Life settlement contracts, fair value method, number of contracts, maturing in year two	55
Life settlement contracts, fair value method, number of contracts, maturing in year three	49
Life settlement contracts, fair value method, number of contracts, maturing in year four	43
Life settlement contracts, fair value method, number of contracts, maturing in year five	36
Life settlement contracts, fair value method, number of contracts, maturing after year five	280
Life settlement contracts, fair value method, number of contracts	526
Life settlement contracts, fair value, maturing in next twelve months	$ 10
Life settlement contracts, fair value, maturing in year two	8
Life settlement contracts, fair value, maturing in year three	7
Life settlement contracts, fair value, maturing in year four	6
Life settlement contracts, fair value, maturing in year five	4
Life settlement contracts, fair value, maturing after year five	23
Life settlement contracts, fair value	58	$ 74
Life settlement contracts, fair value method, face value, maturing in next twelve months	34
Life settlement contracts, fair value method, face value, maturing in year two	30
Life settlement contracts, fair value method, face value, maturing in year three	26
Life settlement contracts, fair value method, face value, maturing in year four	23
Life settlement contracts, fair value method, face value, maturing in year five	19
Life settlement contracts, fair value method, face value, maturing after year five	153
Life settlement contracts, fair value method, face value	$ 285

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Investments (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Non-income producing fixed maturity securities	$ 0	$ 54
Investments that exceed ten percent of stockholders' equity	0	0
Limited partnership investments	2,371	2,548
Undistributed earnings of limited partnership investments	$ 523	$ 687
Percentage of limited partnerships reported on a current basis	60.00%
Percentage of limited partnerships reported on a one month lag	18.00%
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments	68.00%	70.00%
Limited partnerships invested in private debt and equity	27.00%	26.00%
Percentage of equity related limited partnership hedge fund strategies	55.00%
Percentage of multistrategy approach limited partnership hedge fund strategies	26.00%
Percentage of distressed investments limited partnership hedge fund strategies	17.00%
Percentage of fixed income limited partnership hedge fund strategies	2.00%
Carrying value of ten largest limited partnerships	$ 1,168	$ 1,221
Carrying value of limited partnerships as percentage of aggregate partnership equity	4.00%	3.00%
Income As Percentage Of Change In Partnership Equity For All Limited Partnerships	4.00%	3.00%	4.00%
Derivative, Collateral, Right to Reclaim Cash	$ 0	$ 0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative, Notional Amount	174	179
Derivative Liability, Fair Value, Gross Liability	(3)	(5)
Commercial mortgage loans past due or in non-accrual status	0	0
Valuation allowances recorded on commercial mortgage loans	0	0
Future capital call commitments for limited partnership investments	380
Mortgage loan commitments	20
Commitments to purchase or fund privately placed debt securities	130
Commitments to sell various privately placed debt securities	121
Carrying value of securities deposited under requirements of regulatory authorities	2,300	2,800
Cash and securities deposited as collateral for letters of credit	514	364
Carrying value of assets deposited to secure reinsurance and third party obligations	$ 261	$ 263

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Investments (Net investment income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Investment Income [Line Items]
Gross investment income	$ 2,047	$ 1,903	$ 2,125
Investment expense	(59)	(63)	(58)
Net Investment Income	1,988	1,840	2,067
Fixed maturity securities [Member]
Net Investment Income [Line Items]
Gross investment income	1,819	1,751	1,803
Total equity securities available-for-sale [Member]
Net Investment Income [Line Items]
Gross investment income	10	12	12
Limited partnership investments [Member]
Net Investment Income [Line Items]
Gross investment income	155	92	263
Mortgage loans [Member]
Net Investment Income [Line Items]
Gross investment income	41	33	31
Short term investments [Member]
Net Investment Income [Line Items]
Gross investment income	8	6	3
Trading portfolio [Member]
Net Investment Income [Line Items]
Gross investment income	10	8	10
Other [Member]
Net Investment Income [Line Items]
Gross investment income	$ 4	$ 1	$ 3

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Investments (Net realized investment gains (losses)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net realized investment gains (losses)	$ 50	$ (67)	$ 57
Fixed maturity securities [Member]
Gross realized gains	204	131	170
Gross realized losses	(138)	(197)	(129)
Net realized investment gains (losses)	66	(66)	41
Total equity securities available-for-sale [Member]
Gross realized gains	5	2	8
Gross realized losses	(10)	(25)	(7)
Net realized investment gains (losses)	(5)	(23)	1
Derivative [Member]
Net realized investment gains (losses)	(2)	10	(1)
Short term investments and other [Member]
Net realized investment gains (losses)	$ (9)	$ 12	$ 16

XML

Investments (Net change in unrealized gains (losses) on investments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net change in unrealized gains (losses) on investments	$ 224	$ (1,119)	$ 1,517
Fixed maturity securities [Member]
Net change in unrealized gains (losses) on investments	225	(1,114)	1,511
Total equity securities available-for-sale [Member]
Net change in unrealized gains (losses) on investments	(2)	(6)	6
Other [Member]
Net change in unrealized gains (losses) on investments	$ 1	$ 1	$ 0

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Investments (Components of other-than-temporary impairment losses recognized in earnings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other-than-temporary impairment losses recognized in earnings	$ 81	$ 156	$ 77
Corporate and other bonds [Member]
Other-than-temporary impairment losses recognized in earnings	59	104	18
States, municipalities and political subdivisions [Member]
Other-than-temporary impairment losses recognized in earnings	0	18	46
Residential mortgage-backed [Member]
Other-than-temporary impairment losses recognized in earnings	10	8	5
Other asset-backed [Member]
Other-than-temporary impairment losses recognized in earnings	3	1	1
Total asset-backed [Member]
Other-than-temporary impairment losses recognized in earnings	13	9	6
Total fixed maturity securities available-for-sale [Member]
Other-than-temporary impairment losses recognized in earnings	72	131	70
Common stock [Member]
Other-than-temporary impairment losses recognized in earnings	$ 9	$ 25	$ 7

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Investments (Summary of fixed maturity and equity securities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Cost or Amortized Cost	$ 38,467	$ 37,444
Gross Unrealized Gain	2,744	2,717
Gross Unrealized Loss	196	392
Estimated fair value	41,015	39,769
Corporate and other bonds [Member]
Cost or Amortized Cost	17,711	17,080
Gross Unrealized Gain	1,323	1,019
Gross Unrealized Loss	76	342
Estimated fair value	18,958	17,757
Unrealized OTTI Losses (Gains)	(1)	0
States, municipalities and political subdivisions [Member]
Cost or Amortized Cost	12,060	11,729
Gross Unrealized Gain	1,213	1,453
Gross Unrealized Loss	33	8
Estimated fair value	13,240	13,174
Unrealized OTTI Losses (Gains)	(16)	(4)
Residential mortgage-backed [Member]
Cost or Amortized Cost	5,004	4,935
Gross Unrealized Gain	120	154
Gross Unrealized Loss	51	17
Estimated fair value	5,073	5,072
Unrealized OTTI Losses (Gains)	(28)	(37)
Commercial mortgage-backed [Member]
Cost or Amortized Cost	2,016	2,154
Gross Unrealized Gain	48	55
Gross Unrealized Loss	24	12
Estimated fair value	2,040	2,197
Unrealized OTTI Losses (Gains)	0	0
Other asset-backed [Member]
Cost or Amortized Cost	1,022	923
Gross Unrealized Gain	8	6
Gross Unrealized Loss	5	8
Estimated fair value	1,025	921
Unrealized OTTI Losses (Gains)	0	0
Total asset-backed [Member]
Cost or Amortized Cost	8,042	8,012
Gross Unrealized Gain	176	215
Gross Unrealized Loss	80	37
Estimated fair value	8,138	8,190
Unrealized OTTI Losses (Gains)	(28)	(37)
U.S. Treasury and obligations of government-sponsored enterprises [Member]
Cost or Amortized Cost	83	62
Gross Unrealized Gain	10	5
Gross Unrealized Loss	0	0
Estimated fair value	93	67
Unrealized OTTI Losses (Gains)	0	0
Foreign Government Debt Securities [Member]
Cost or Amortized Cost	435	334
Gross Unrealized Gain	13	13
Gross Unrealized Loss	3	1
Estimated fair value	445	346
Unrealized OTTI Losses (Gains)	0	0
Redeemable preferred stock [Member]
Cost or Amortized Cost	18	33
Gross Unrealized Gain	1	2
Gross Unrealized Loss	0	0
Estimated fair value	19	35
Unrealized OTTI Losses (Gains)	0	0
Total fixed maturity securities available-for-sale [Member]
Cost or Amortized Cost	38,349	37,250
Gross Unrealized Gain	2,736	2,707
Gross Unrealized Loss	192	388
Estimated fair value	40,893	39,569
Unrealized OTTI Losses (Gains)	(45)	(41)
Fixed Maturities [Member]
Cost or Amortized Cost, Trading Securities	12	3
Estimated Fair Value, Trading Securities	12	3
Common stock [Member]
Cost or Amortized Cost	13	46
Gross Unrealized Gain	6	3
Gross Unrealized Loss	0	1
Estimated fair value	19	48
Preferred stock [Member]
Cost or Amortized Cost	93	145
Gross Unrealized Gain	2	7
Gross Unrealized Loss	4	3
Estimated fair value	91	149
Total equity securities available-for-sale [Member]
Cost or Amortized Cost	106	191
Gross Unrealized Gain	8	10
Gross Unrealized Loss	4	4
Estimated fair value	$ 110	$ 197

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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	$ 6,989	$ 7,464
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	167	342
Estimated Fair Value, 12 Months or Longer	584	502
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	29	50
Estimated Fair Value, Total	7,573	7,966
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	196	392
Corporate and other bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	2,615	4,882
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	61	302
Estimated Fair Value, 12 Months or Longer	254	162
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	15	40
Estimated Fair Value, Total	2,869	5,044
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	76	342
States, municipalities and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	959	338
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	32	8
Estimated Fair Value, 12 Months or Longer	23	75
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	0
Estimated Fair Value, Total	982	413
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	33	8
Residential mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	2,136	963
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	44	9
Estimated Fair Value, 12 Months or Longer	201	164
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	7	8
Estimated Fair Value, Total	2,337	1,127
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	51	17
Commercial mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	756	652
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	22	10
Estimated Fair Value, 12 Months or Longer	69	96
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2	2
Estimated Fair Value, Total	825	748
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	24	12
Other asset-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	398	552
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5	8
Estimated Fair Value, 12 Months or Longer	24	5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Estimated Fair Value, Total	422	557
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	5	8
Total asset-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	3,290	2,167
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	71	27
Estimated Fair Value, 12 Months or Longer	294	265
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	9	10
Estimated Fair Value, Total	3,584	2,432
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	80	37
U.S. Treasury and obligations of government-sponsored enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	5	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Estimated Fair Value, 12 Months or Longer	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Estimated Fair Value, Total	5	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	0
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	108	54
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	1
Estimated Fair Value, 12 Months or Longer	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Estimated Fair Value, Total	108	54
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	3	1
Redeemable preferred stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	0	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Estimated Fair Value, 12 Months or Longer	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Estimated Fair Value, Total	0	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	0
Total fixed maturity securities available-for-sale [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	6,977	7,448
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	167	338
Estimated Fair Value, 12 Months or Longer	571	502
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	25	50
Estimated Fair Value, Total	7,548	7,950
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	192	388
Common stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months		3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		1
Estimated Fair Value, 12 Months or Longer		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Estimated Fair Value, Total		3
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		1
Preferred stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months	12	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	3
Estimated Fair Value, 12 Months or Longer	13	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4	0
Estimated Fair Value, Total	25	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 4	3
Total equity securities available-for-sale [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value, Less than 12 Months		16
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		4
Estimated Fair Value, 12 Months or Longer		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Estimated Fair Value, Total		16
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 4

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Investments (Activity related to the pretax fixed maturity credit loss component reflected within retained earnings for securities still held for which a portion of an OTTI loss was recognized in OCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance of credit losses on fixed maturity securities	$ 53	$ 62	$ 74
Reductions for securities sold during the period	(16)	(9)	(9)
Reductions for securities the Company intends to sell or more likely than not will be required to sell	(1)	0	(3)
Ending balance of credit losses on fixed maturity securities	$ 36	$ 53	$ 62

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Investments (Contractual maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Investments [Abstract]
Due in one year or less, cost or amortized cost	$ 1,779	$ 1,574
Due after one year through five years, cost or amortized cost	7,566	7,721
Due after five years through ten years, cost or amortized cost	15,892	14,652
Due after ten years, cost or amortized cost	13,112	13,303
Total Amortized Cost Basis	38,349	37,250
Due in one year or less, estimated fair value	1,828	1,595
Due after one year through five years, estimated fair value	7,955	8,070
Due after five years through ten years, estimated fair value	16,332	14,915
Due after ten years, estimated fair value	14,778	14,989
Total Estimated Fair Value	$ 40,893	$ 39,569

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Fair Value (Assets and liabilities measured at fair value on a recurring basis) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	$ 42,406	$ 41,442
Corporate and other bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	18,970	17,760
States, municipalities and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	13,240	13,174
Residential mortgage-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	5,073	5,072
Commercial mortgage-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	2,040	2,197
Other asset-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	1,025	921
Total asset-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	8,138	8,190
U.S. Treasury and obligations of government-sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	93	67
Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	445	346
Redeemable preferred stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	19	35
Fixed maturity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	40,905	39,572
Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	110	197
Other invested assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	5	17
Short term investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	1,328	1,582
Life settlement contracts, included in Other assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	58	74
Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities, measured on a recurring basis	(3)	(5)
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	678	726
Fair value of liabilities, measured on a recurring basis	0	0
Level 1 [Member] | Corporate and other bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 1 [Member] | States, municipalities and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 1 [Member] | Residential mortgage-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 1 [Member] | Commercial mortgage-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 1 [Member] | Other asset-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 1 [Member] | Total asset-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 1 [Member] | U.S. Treasury and obligations of government-sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	93	66
Level 1 [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 1 [Member] | Redeemable preferred stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	19	35
Level 1 [Member] | Fixed maturity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	112	101
Level 1 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	91	177
Level 1 [Member] | Other invested assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 1 [Member] | Short term investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	475	448
Level 1 [Member] | Life settlement contracts, included in Other assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 1 [Member] | Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities, measured on a recurring basis	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	41,321	40,243
Fair value of liabilities, measured on a recurring basis	(3)	(5)
Level 2 [Member] | Corporate and other bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	18,840	17,592
Level 2 [Member] | States, municipalities and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	13,239	13,172
Level 2 [Member] | Residential mortgage-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	4,944	4,938
Level 2 [Member] | Commercial mortgage-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	2,027	2,175
Level 2 [Member] | Other asset-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	968	868
Level 2 [Member] | Total asset-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	7,939	7,981
Level 2 [Member] | U.S. Treasury and obligations of government-sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	1
Level 2 [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	445	346
Level 2 [Member] | Redeemable preferred stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 2 [Member] | Fixed maturity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	40,463	39,092
Level 2 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 2 [Member] | Other invested assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	5	17
Level 2 [Member] | Short term investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	853	1,134
Level 2 [Member] | Life settlement contracts, included in Other assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 2 [Member] | Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities, measured on a recurring basis	(3)	(5)
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	407	473
Fair value of liabilities, measured on a recurring basis	0	0
Level 3 [Member] | Corporate and other bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	130	168
Level 3 [Member] | States, municipalities and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	1	2
Level 3 [Member] | Residential mortgage-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	129	134
Level 3 [Member] | Commercial mortgage-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	13	22
Level 3 [Member] | Other asset-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	57	53
Level 3 [Member] | Total asset-backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	199	209
Level 3 [Member] | U.S. Treasury and obligations of government-sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 3 [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 3 [Member] | Redeemable preferred stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 3 [Member] | Fixed maturity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	330	379
Level 3 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	19	20
Level 3 [Member] | Other invested assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 3 [Member] | Short term investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	0	0
Level 3 [Member] | Life settlement contracts, included in Other assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets, measured on a recurring basis	58	74
Level 3 [Member] | Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities, measured on a recurring basis	$ 0	$ 0

XML

Fair Value (Table of reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	$ 473	$ 1,281
Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)	5	39
Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)	(4)	(8)
Purchases	296	303
Sales	(61)	(276)
Settlements	(157)	(182)
Transfers into Level 3	61	79
Transfers out of Level 3	(206)	(763)
Balance, Ending, Assets	407	473
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(5)	(1)
Corporate and other bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	168	162
Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)	1	(2)
Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)	1	(3)
Purchases	163	65
Sales	(36)	(13)
Settlements	(103)	(35)
Transfers into Level 3	0	40
Transfers out of Level 3	(64)	(46)
Balance, Ending, Assets	130	168
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	(2)
States, municipalities and political subdivisions [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	2	94
Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)	0	1
Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)	0	0
Purchases	0	0
Sales	0	0
Settlements	(1)	(10)
Transfers into Level 3	0	0
Transfers out of Level 3	0	(83)
Balance, Ending, Assets	1	2
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Residential mortgage-backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	134	189
Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)	3	5
Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)	(5)	(3)
Purchases	15	81
Sales	0	0
Settlements	(14)	(35)
Transfers into Level 3	56	14
Transfers out of Level 3	(60)	(117)
Balance, Ending, Assets	129	134
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Commercial Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	22	83
Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)	(1)	7
Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)	(1)	(4)
Purchases	32	23
Sales	0	0
Settlements	(17)	(17)
Transfers into Level 3	3	17
Transfers out of Level 3	(25)	(87)
Balance, Ending, Assets	13	22
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Other asset-backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	53	655
Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)	(2)	3
Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)	1	3
Purchases	86	130
Sales	(25)	(263)
Settlements	(1)	(52)
Transfers into Level 3	2	7
Transfers out of Level 3	(57)	(430)
Balance, Ending, Assets	57	53
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Total asset-backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	209	927
Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)	0	15
Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)	(5)	(4)
Purchases	133	234
Sales	(25)	(263)
Settlements	(32)	(104)
Transfers into Level 3	61	38
Transfers out of Level 3	(142)	(634)
Balance, Ending, Assets	199	209
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Fixed maturity securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	379	1,183
Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)	1	14
Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)	(4)	(7)
Purchases	296	299
Sales	(61)	(276)
Settlements	(136)	(149)
Transfers into Level 3	61	78
Transfers out of Level 3	(206)	(763)
Balance, Ending, Assets	330	379
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	(2)
Equity securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	20	16
Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)	(1)	0
Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)	0	(1)
Purchases	0	4
Sales	0	0
Settlements	0	0
Transfers into Level 3	0	1
Transfers out of Level 3	0	0
Balance, Ending, Assets	19	20
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(2)	0
Life settlement contracts, included in Other assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	74	82
Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)	5	25
Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)	0	0
Purchases	0	0
Sales	0	0
Settlements	(21)	(33)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, Ending, Assets	58	74
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ (3)	$ 1

XML

Fair Value (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value, Assets, Level 2 to Level 1, Transfers	$ 0	$ 63
Fair Value, Assets, Level 1 to Level 2, Transfers	0	52
Other Invested Assets Overseas Deposit	$ 31	$ 27

XML

Fair Value (Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets) (Details) - Income Approach Valuation Technique [Member] - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fixed maturity securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 106	$ 138
Fixed maturity securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit Spread	2.00%	3.00%
Fixed maturity securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit Spread	40.00%	184.00%
Fixed maturity securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit Spread	4.00%	6.00%
Life settlement contracts, included in Other assets [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure		$ 74
Discount rate risk premium		9.00%
Life settlement contracts, included in Other assets [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortality assumption		55.00%
Life settlement contracts, included in Other assets [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortality assumption		1676.00%
Life settlement contracts, included in Other assets [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortality assumption		164.00%

XML

Fair Value (Carrying amount and estimated fair value of financial instrument assets and liabilities which are not measured at fair value) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Financial Assets [Abstract]
Mortgage loans	$ 591	$ 678
Financial Liabilities [Abstract]
Short term debt	0	350
Long term debt	2,710	2,210
Carrying Amount [Member]
Financial Assets [Abstract]
Mortgage loans	591	678
Financial Liabilities [Abstract]
Short term debt		350
Long term debt	2,710	2,210
Estimated Fair Value [Member]
Financial Assets [Abstract]
Mortgage loans	594	688
Financial Liabilities [Abstract]
Short term debt		360
Long term debt	2,952	2,433
Level 1 [Member] | Estimated Fair Value [Member]
Financial Assets [Abstract]
Mortgage loans	0	0
Financial Liabilities [Abstract]
Short term debt		0
Long term debt	0	0
Level 2 [Member] | Estimated Fair Value [Member]
Financial Assets [Abstract]
Mortgage loans	0	0
Financial Liabilities [Abstract]
Short term debt		360
Long term debt	2,952	2,433
Level 3 [Member] | Estimated Fair Value [Member]
Financial Assets [Abstract]
Mortgage loans	594	688
Financial Liabilities [Abstract]
Short term debt		0
Long term debt	$ 0	$ 0

XML

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal income taxes received from (paid to) Loews	$ (142)	$ (256)	$ (287)
Unrecognized tax benefits	0	0
Interest income (expense)	0	0	0
Unrecognized Tax Benefits, Income Tax Penalties Expense	0	0	0
Accrued interest and penalties	0	0
Deferred tax liability on undistributed income related to a foreign subsidiary	1
Undistributed Earnings from a Foreign Subsidiary	3
Foreign tax expense (benefit) on income from continuing operations	9	14	24
Income (loss) from continuing foreign operations	51	71	$ 66
Operating Loss Carryforwards	0
Tax Credit Carryforward, Amount	0
Valuation allowance	$ 0	$ 0

XML

Income Taxes (Reconciliation between the Company's federal income tax (expense) benefit at statutory rates and the recorded income tax (expense) benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense at statutory rates	$ (398)	$ (192)	$ (423)
Tax benefit from tax exempt income	124	123	119
Foreign taxes and credits	3	9	(6)
Other tax expense	(7)	(10)	(9)
Income tax (expense) benefit	$ (278)	$ (70)	$ (319)

XML

Income Taxes (Current and deferred components of the Company's income tax (expense) benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current tax (expense) benefit	$ (142)	$ (220)	$ (318)
Deferred income tax (expense) benefit	(136)	150	(1)
Income tax (expense) benefit	$ (278)	$ (70)	$ (319)

XML

Income Taxes (Significant components of the Company's deferred tax assets and liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets:
Property and casualty claim and claim adjustment expense reserves	$ 125	$ 178
Unearned premium reserves	206	230
Receivables	27	29
Employee benefits	272	281
Life settlement contracts	56	48
Deferred retroactive reinsurance benefit	117	84
Investment valuation differences	0	29
Other assets	148	142
Gross deferred tax assets	951	1,021
Deferred Tax Liabilities:
Investment valuation differences	57	0
Deferred acquisition costs	120	117
Net unrealized gains	309	202
Other liabilities	86	64
Deferred Tax Liabilities, Gross	572	383
Net deferred tax asset (liability)	$ 379	$ 638

XML

Claim and Claim Adjustment Expense Reserves (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2010
Catastrophe losses net of reinsurance		$ 165	$ 141	$ 156
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development Life & Group		(45)	(50)	(14)
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development, Workers' Compensation Reinsurance Pool				26
Loss Portfolio Transfer [Member]
Net A&EP claim and allocated claim adjustment expense reserves ceded to NICO					$ 1,600
Aggregate limit under A&EP Loss Portfolio Transfer					4,000
A&EP claim and allocated claim adjustment expense reserves ceded under existing third party reinsurance contracts transferred to NICO under A&EP Loss Portfolio Transfer					1,200
Reinsurance premium paid to NICO under A&EP Loss Portfolio Transfer					2,000
Net reinsurance receivables transferrred to NICO under A&EP Loss Portfolio Transfer					215
Total consideration paid to NICO under AEP Loss Portfolio Transfer					$ 2,200
Net AEP adverse development before consideration of LPT	$ 200	200	150	$ 0
Unfavorable Development related to Asbestos Claims and Higher than Expected Severity in Pollution Claims			150
Cumulative amounts ceded under AEP Loss Portfolio Transfer		2,800	2,600
Deferred reinsurance benefit yet to be recognized		334	$ 241
Fair value of collateral trust account established by NICO under A&EP Loss Portfolio Transfer		$ 2,800

XML

Claim and Claim Adjustment Expense Reserves (Reconcilliation of claim and claim adjustment expense reserves) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reserves, beginning of year: [Abstract]
Gross		$ 22,663	$ 23,271	$ 24,089
Ceded		4,087	4,344	4,972
Net reserves, beginning of year		18,576	18,927	19,117
Change in net reserves due to acquisition (disposition) of subsidiaries		0	0	(13)
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year		5,025	4,934	5,043
Decrease in provision for insured events of prior years		(342)	(255)	(36)
Amortization of discount		175	166	161
Total net incurred (1)	[1]	4,858	4,845	5,168
Net payments attributable to:
Current year events		(967)	(856)	(945)
Prior year events		(4,167)	(4,089)	(4,355)
Total net payments		(5,134)	(4,945)	(5,300)
Foreign currency translation adjustment and other		(51)	(251)	(45)
Net reserves, end of year		18,249	18,576	18,927
Ceded reserves, end of year		4,094	4,087	4,344
Gross reserves, end of year		$ 22,343	$ 22,663	$ 23,271

[1] Total net incurred above does not agree to Insurance claims and policyholders' benefits as reflected on the Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance and loss deductible receivables, and benefit expenses related to future policy benefits, which are not reflected in the table above.

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Claim and Claim Adjustment Expense Reserves (Gross and net carried claim and claim adjustment expense reserves) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gross Case Reserves	$ 11,860	$ 12,102
Gross IBNR Reserves	10,483	10,561
Total Gross Carried Claim and Claim Adjustment Expense Reserves	22,343	22,663	$ 23,271	$ 24,089
Net Case Reserves	9,627	9,836
Net IBNR Reserves	8,622	8,740
Total Net Carried Claim and Claim Adjustment Expense Reserves	18,249	18,576	$ 18,927	$ 19,117
Specialty [Member]
Gross Case Reserves	1,871	2,011
Gross IBNR Reserves	4,278	4,258
Total Gross Carried Claim and Claim Adjustment Expense Reserves	6,149	6,269
Net Case Reserves	1,681	1,810
Net IBNR Reserves	3,723	3,758
Total Net Carried Claim and Claim Adjustment Expense Reserves	5,404	5,568
Commercial [Member]
Gross Case Reserves	4,661	4,975
Gross IBNR Reserves	4,233	4,208
Total Gross Carried Claim and Claim Adjustment Expense Reserves	8,894	9,183
Net Case Reserves	4,353	4,651
Net IBNR Reserves	3,952	3,925
Total Net Carried Claim and Claim Adjustment Expense Reserves	8,305	8,576
International [Member]
Gross Case Reserves	632	622
Gross IBNR Reserves	696	725
Total Gross Carried Claim and Claim Adjustment Expense Reserves	1,328	1,347
Net Case Reserves	548	531
Net IBNR Reserves	653	688
Total Net Carried Claim and Claim Adjustment Expense Reserves	1,201	1,219
Life and Group Non-Core [Member]
Gross Case Reserves	3,172	2,973
Gross IBNR Reserves	186	247
Total Gross Carried Claim and Claim Adjustment Expense Reserves	3,358	3,220
Net Case Reserves	2,951	2,714
Net IBNR Reserves	158	216
Total Net Carried Claim and Claim Adjustment Expense Reserves	3,109	2,930
Corporate and Other [Member]
Gross Case Reserves	1,524	1,521
Gross IBNR Reserves	1,090	1,123
Total Gross Carried Claim and Claim Adjustment Expense Reserves	2,614	2,644
Net Case Reserves	94	130
Net IBNR Reserves	136	153
Total Net Carried Claim and Claim Adjustment Expense Reserves	$ 230	$ 283

XML

Claim and Claim Adjustment Expense Reserves (Net prior year development) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development, excluding Life & Group	$ (288)	$ (210)	$ (21)
Pretax (favorable) unfavorable premium development, excluding Life & Group	(26)	(8)	(32)
Total pretax (favorable) unfavorable net prior year development, excluding Life & Group	(314)	(218)	(53)
Specialty [Member]
Segment Reporting Information [Line Items]
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development, excluding Life & Group	(287)	(141)	(136)
Pretax (favorable) unfavorable premium development, excluding Life & Group	(18)	(11)	(13)
Total pretax (favorable) unfavorable net prior year development, excluding Life & Group	(305)	(152)	(149)
Commercial [Member]
Segment Reporting Information [Line Items]
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development, excluding Life & Group	55	(15)	176
Pretax (favorable) unfavorable premium development, excluding Life & Group	(2)	(15)	(20)
Total pretax (favorable) unfavorable net prior year development, excluding Life & Group	53	(30)	156
International [Member]
Segment Reporting Information [Line Items]
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development, excluding Life & Group	(58)	(54)	(59)
Pretax (favorable) unfavorable premium development, excluding Life & Group	(6)	18	2
Total pretax (favorable) unfavorable net prior year development, excluding Life & Group	(64)	(36)	(57)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development, excluding Life & Group	2	0	(2)
Pretax (favorable) unfavorable premium development, excluding Life & Group	0	0	(1)
Total pretax (favorable) unfavorable net prior year development, excluding Life & Group	$ 2	$ 0	$ (3)

XML

Claim and Claim Adjustment Expense Reserves (Net prior year claim and allocated claim adjustment expense reserve development for Specialty segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development, excluding Life & Group	$ (288)	$ (210)	$ (21)
Specialty [Member]
Net prior year claim and allocated claim adjustment expense reserve development, Medical Professional Liability	(37)	(43)	39
Net prior year claim and allocated claim adjustment expense reserve development, Other Professional Liability and Management Liability	(130)	0	(87)
Net prior year claim and allocated claim adjustment expense reserve development, Surety	(63)	(69)	(82)
Warranty	4	(2)	(2)
Net prior year claim and allocated claim adjustment expense reserve development, Other	(61)	(27)	(4)
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development, excluding Life & Group	$ (287)	$ (141)	$ (136)

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Specialty Reconciliation (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	$ 18,249	$ 18,576	$ 18,927	$ 19,117
Specialty - Medical Professional Liability [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	1,779
Specialty - Other Professional and Management Liability [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	3,063
Specialty - Surety [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	394
Specialty - Warranty [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	37
Specialty - Other [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	131
Specialty [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	$ 5,404	$ 5,568

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Incurred Claims and Allocated Claim Adjustment Expenses Specialty - Medical Professional Liability (Details) - Specialty - Medical Professional Liability [Member] $ in Millions	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2007 USD ($)
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1,054
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 4,872
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	12,122
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 9
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 385	$ 399	$ 401	$ 390	$ 391	$ 395	$ 427	$ 444	$ 452	$ 448
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	14,094
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 9
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 442	455	467	468	468	480	496	451	$ 426
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	15,573
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 12
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 432	463	471	480	506	494	469	$ 462
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	15,206
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 16
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 403	446	470	486	478	478	$ 483
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	17,428
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 23
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 491	501	533	507	492	$ 486
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	18,375
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 47
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 559	567	575	529	$ 526
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	19,565
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 95
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 567	560	540	$ 534
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	19,286
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 165
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 585	548	$ 511
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	16,798
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 278
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 539	$ 480
Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	11,600
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 400
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 469

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Cumulative Paid Claim and Claim Adjustment Expenses Specialty - Medical Professional Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	$ 4,167	$ 4,089	$ 4,355
Liability for Unpaid Claims and Claims Adjustment Expense, Net	18,249	18,576	18,927	$ 19,117
Specialty - Medical Professional Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	3,156
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	1,716
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	30
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense	33
Liability for Unpaid Claims and Claims Adjustment Expense, Net	1,779
Short-duration Insurance Contracts, Accident Year 2007 [Member] | Specialty - Medical Professional Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	365	364	352	326	$ 296	$ 247	$ 201	$ 134	$ 68	$ 11
Short-duration Insurance Contracts, Accident Year 2008 [Member] | Specialty - Medical Professional Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	428	409	395	377	332	282	207	90	$ 9
Short-duration Insurance Contracts, Accident Year 2009 [Member] | Specialty - Medical Professional Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	396	377	353	328	278	180	75	$ 9
Short-duration Insurance Contracts, Accident Year 2010 [Member] | Specialty - Medical Professional Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	371	361	338	273	186	93	$ 11
Short-duration Insurance Contracts, Accident Year 2011 [Member] | Specialty - Medical Professional Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	407	379	315	225	121	$ 18
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Specialty - Medical Professional Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	428	359	236	121	$ 15
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Specialty - Medical Professional Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	364	259	121	$ 18
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Specialty - Medical Professional Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	274	149	$ 25
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Specialty - Medical Professional Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	105	$ 22
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Specialty - Medical Professional Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 18

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Strengthening or Releasing of Prior Accident Year Reserves Specialty - Medical Professional Liability (Details) - Specialty - Medical Professional Liability [Member] - USD ($) $ in Millions	12 Months Ended									24 Months Ended	36 Months Ended	48 Months Ended	60 Months Ended	72 Months Ended	84 Months Ended	96 Months Ended	108 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ (16)	$ (29)	$ 63
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development Prior Years	(21)	(14)	(24)
Net prior year claim and allocated claim adjustment expense reserve development, Medical Professional Liability	(37)	(43)	39
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(14)	(2)	11	$ (1)	$ (4)	$ (32)	$ (17)	$ (8)	$ 4								$ (63)
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(13)	(12)	(1)	0	(12)	(16)	45	$ 25								$ 16
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(31)	(8)	(9)	(26)	12	25	$ 7								$ (30)
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(43)	(24)	(16)	8	0	$ (5)								$ (80)
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(10)	(32)	26	15	$ 6								$ 5
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(8)	(8)	46	$ 3								$ 33
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	7	20	$ 6								$ 33
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	37	$ 37								$ 74
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ 59

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Incurred Claims and Allocated Claim Adjustment Expenses Specialty - Other Professional and Management LIability (Details) - Specialty - Other Professional and Management Liability [Member] $ in Millions	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2007 USD ($)
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 2,014
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 8,362
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	16,011
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 13
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 662	$ 662	$ 681	$ 704	$ 724	$ 734	$ 754	$ 806	$ 817	$ 804
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	16,326
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 35
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 827	845	850	880	915	924	954	933	$ 916
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	17,263
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 50
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 903	895	900	891	898	903	873	$ 829
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	17,796
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 39
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 823	836	846	848	850	827	$ 825
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	18,620
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 107
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 910	944	948	933	904	$ 876
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	18,228
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 107
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 833	870	876	894	$ 907
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	17,324
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 137
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 840	879	841	$ 844
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	16,886
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 306
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 854	859	$ 841
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	16,391
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 478
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 851	$ 847
Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	15,045
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 742
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 859

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Cumulative Paid Claim and Claim Adjustment Expenses Specialty - Other Professional and Management Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	$ 4,167	$ 4,089	$ 4,355
Liability for Unpaid Claims and Claims Adjustment Expense, Net	18,249	18,576	18,927	$ 19,117
Specialty - Other Professional and Management Liability [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	5,475
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	2,887
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	104
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense	72
Liability for Unpaid Claims and Claims Adjustment Expense, Net	3,063
Short-duration Insurance Contracts, Accident Year 2007 [Member] | Specialty - Other Professional and Management Liability [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	614	593	585	564	$ 524	$ 472	$ 397	$ 307	$ 162	$ 32
Short-duration Insurance Contracts, Accident Year 2008 [Member] | Specialty - Other Professional and Management Liability [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	741	719	678	641	600	515	376	181	$ 39
Short-duration Insurance Contracts, Accident Year 2009 [Member] | Specialty - Other Professional and Management Liability [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	798	769	719	638	550	358	195	$ 37
Short-duration Insurance Contracts, Accident Year 2010 [Member] | Specialty - Other Professional and Management Liability [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	721	670	630	541	404	203	$ 31
Short-duration Insurance Contracts, Accident Year 2011 [Member] | Specialty - Other Professional and Management Liability [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	726	682	604	502	313	$ 71
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Specialty - Other Professional and Management Liability [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	648	570	398	248	$ 57
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Specialty - Other Professional and Management Liability [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	583	426	240	$ 51
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Specialty - Other Professional and Management Liability [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	375	212	$ 51
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Specialty - Other Professional and Management Liability [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	209	$ 48
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Specialty - Other Professional and Management Liability [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 60

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Strengthening or Releasing of Prior Accident Year Reserves Specialty - Other Professional and Management Liability (Details) - Specialty - Other Professional and Management Liability [Member] - USD ($) $ in Millions	12 Months Ended									24 Months Ended	36 Months Ended	48 Months Ended	60 Months Ended	72 Months Ended	84 Months Ended	96 Months Ended	108 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ (134)	$ 7	$ (52)
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development Prior Years	4	(7)	(35)
Net prior year claim and allocated claim adjustment expense reserve development, Other Professional Liability and Management Liability	(130)	0	(87)
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	0	(19)	(23)	$ (20)	$ (10)	$ (20)	$ (52)	$ (11)	$ 13								$ (142)
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(18)	(5)	(30)	(35)	(9)	(30)	21	$ 17								$ (89)
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	8	(5)	9	(7)	(5)	30	$ 44								$ 74
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(13)	(10)	(2)	(2)	23	$ 2								$ (2)
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(34)	(4)	15	29	$ 28								$ 34
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(37)	(6)	(18)	$ (13)								$ (74)
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(39)	38	$ (3)								$ (4)
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(5)	$ 18								$ 13
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ 4

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Incurred Claims and Allocated Claim Adjustment Expenses Specialty - Surety (Details) - Specialty - Surety [Member] $ in Millions	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2007 USD ($)
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 319
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 787
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	6,270
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 50	$ 49	$ 49	$ 51	$ 56	$ 59	$ 57	$ 81	$ 107	$ 98
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	7,153
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 44	45	48	52	61	68	73	114	$ 114
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	6,654
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 53	52	59	68	85	103	114	$ 114
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	5,943
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 8
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 63	66	76	84	111	112	$ 112
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	5,760
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 9
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 70	75	87	116	121	$ 120
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	5,473
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 16
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 52	70	98	122	$ 120
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	4,890
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 24
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 106	115	121	$ 120
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	4,737
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 51
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 94	124	$ 123
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	4,279
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 100
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 131	$ 131
Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	2,902
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 110
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 124

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Cumulative Paid Claim and Claim Adjustment Expenses Specialty - Surety (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	$ 4,167	$ 4,089	$ 4,355
Liability for Unpaid Claims and Claims Adjustment Expense, Net	18,249	18,576	18,927	$ 19,117
Specialty - Surety [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	437
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	350
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	16
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense	28
Liability for Unpaid Claims and Claims Adjustment Expense, Net	394
Specialty - Surety [Member] | Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	50	49	48	46	$ 46	$ 46	$ 45	$ 40	$ 30	$ 12
Specialty - Surety [Member] | Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	43	43	43	43	42	39	35	27	$ 9
Specialty - Surety [Member] | Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	47	46	45	43	41	34	24	$ 13
Specialty - Surety [Member] | Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	55	58	57	55	50	34	$ 13
Specialty - Surety [Member] | Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	60	60	58	55	42	$ 19
Specialty - Surety [Member] | Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	35	35	34	32	$ 5
Specialty - Surety [Member] | Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	78	69	40	$ 16
Specialty - Surety [Member] | Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	38	30	$ 7
Specialty - Surety [Member] | Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	26	$ 7
Specialty - Surety [Member] | Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 5

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Strengthening or Releasing of Prior Accident Year Reserves Specialty - Surety (Details) - Specialty - Surety [Member] - USD ($) $ in Millions	12 Months Ended										24 Months Ended	36 Months Ended	48 Months Ended	60 Months Ended	72 Months Ended	84 Months Ended	96 Months Ended	108 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ (64)	$ (65)	$ (75)
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development Prior Years	1	(4)	(7)
Net prior year claim and allocated claim adjustment expense reserve development, Surety	(63)	(69)	(82)
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	1	0	(2)	$ (5)	$ (3)	$ 2	$ (24)	$ (26)	$ 9									$ (48)
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(1)	(3)	(4)	(9)	(7)	(5)	(41)	0									$ (70)
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	1	(7)	(9)	(17)	(18)	(11)	0									$ (61)
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(3)	(10)	(8)	(27)	(1)	0									$ (49)
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(5)	(12)	(29)	(5)	1									$ (50)
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(18)	(28)	(24)	2									$ (68)
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(9)	(6)	1									$ (14)
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(30)	1									$ (29)
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Claims Development [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ 0

XML

Claim and Claim Adjustment Expense Reserves (Net prior year claim and allocated claim adjustment expense reserve development for Commercial segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development, excluding Life & Group	$ (288)	$ (210)	$ (21)
Commercial [Member]
Net prior year claim and allocated claim adjustment expense reserve development, Commercial Auto	(46)	(22)	31
Net prior year claim and allocated claim adjustment expense reserve development, General Liability	(28)	(33)	45
Net prior year claim and allocated claim adjustment expense reserve development, Workers' Compensation	150	80	139
Property and Other	(21)	(40)	(39)
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development, excluding Life & Group	$ 55	$ (15)	$ 176

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Commercial Reconciliation (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	$ 18,249	$ 18,576	$ 18,927	$ 19,117
Commercial - Auto [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	424
Commercial - General Liability [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	3,248
Commercial - Workers Compensation [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	4,306
Commercial - Property and Other [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	327
Commercial [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	$ 8,305	$ 8,576

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Incurred Claims and Allocated Claim Adjustment Expenses Commercial - Auto (Details) - Commercial - Auto [Member] $ in Millions	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2007 USD ($)
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 247
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 2,630
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	67,473
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 352	$ 354	$ 355	$ 356	$ 358	$ 355	$ 360	$ 368	$ 367	$ 348
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	56,407
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 296	298	298	305	309	306	316	323	$ 322
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	47,325
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 272	275	277	281	278	274	272	$ 287
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	46,324
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 281	286	291	283	279	274	$ 262
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	46,676
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 5
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 285	290	293	279	273	$ 262
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	45,279
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 11
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 300	296	292	282	$ 270
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	38,513
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 20
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 241	257	259	$ 242
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	32,958
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 40
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 210	221	$ 231
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	29,714
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 65
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 197	$ 199
Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	25,196
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 105
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 196

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Cumulative Paid Claim and Claim Adjustment Expenses Commercial - Auto (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	$ 4,167	$ 4,089	$ 4,355
Liability for Unpaid Claims and Claims Adjustment Expense, Net	18,249	18,576	18,927	$ 19,117
Commercial - Auto [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	2,220
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	410
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	4
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense	10
Liability for Unpaid Claims and Claims Adjustment Expense, Net	424
Commercial - Auto [Member] | Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	351	350	349	348	$ 340	$ 329	$ 295	$ 250	$ 185	$ 93
Commercial - Auto [Member] | Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	293	292	291	289	274	244	210	158	$ 83
Commercial - Auto [Member] | Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	270	270	269	257	229	188	128	$ 72
Commercial - Auto [Member] | Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	279	274	265	240	197	137	$ 72
Commercial - Auto [Member] | Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	275	264	241	193	141	$ 78
Commercial - Auto [Member] | Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	276	253	214	157	$ 77
Commercial - Auto [Member] | Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	195	164	132	$ 73
Commercial - Auto [Member] | Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	135	100	$ 63
Commercial - Auto [Member] | Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	95	$ 52
Commercial - Auto [Member] | Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 51

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Strengthening or Releasing of Prior Accident Year Reserves Commercial - Auto (Details) - Commercial - Auto [Member] - USD ($) $ in Millions	12 Months Ended									24 Months Ended	36 Months Ended	48 Months Ended	60 Months Ended	72 Months Ended	84 Months Ended	96 Months Ended	108 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ (42)	$ (19)	$ 37
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development Prior Years	(4)	(3)	(6)
Net prior year claim and allocated claim adjustment expense reserve development, Commercial Auto	(46)	(22)	31
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(2)	(1)	(1)	$ (2)	$ 3	$ (5)	$ (8)	$ 1	$ 19								$ 4
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(2)	0	(7)	(4)	3	(10)	(7)	$ 1								$ (26)
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(3)	(2)	(4)	3	4	2	$ (15)								$ (15)
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(5)	(5)	8	4	5	$ 12								$ 19
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(5)	(3)	14	6	$ 11								$ 23
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	4	4	10	$ 12								$ 30
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(16)	(2)	$ 17								$ (1)
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(11)	$ (10)								$ (21)
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ (2)

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Incurred Claims and Allocated Claim Adjustment Expenses Commercial - General Liability (Details) - Commercial - General Liability [Member] $ in Millions	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2007 USD ($)
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1,382
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 6,065
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	53,553
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 28
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 540	$ 548	$ 545	$ 559	$ 600	$ 610	$ 639	$ 678	$ 673	$ 774
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	44,586
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 18
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 591	600	613	632	633	647	630	604	$ 611
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	43,955
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 16
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 622	619	623	629	633	634	637	$ 591
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	43,378
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 25
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 659	675	695	649	599	597	$ 566
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	38,101
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 41
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 621	611	610	564	534	$ 537
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	34,037
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 63
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 558	570	579	563	$ 539
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	32,897
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 142
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 643	634	645	$ 615
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	26,744
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 224
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 635	634	$ 627
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	21,687
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 330
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 574	$ 573
Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	16,720
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 495
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 622

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Cumulative Paid Claim and Claim Adjustment Expenses Commercial - General Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	$ 4,167	$ 4,089	$ 4,355
Liability for Unpaid Claims and Claims Adjustment Expense, Net	18,249	18,576	18,927	$ 19,117
Commercial - General Liability [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	4,002
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	2,063
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	1,130
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense	55
Liability for Unpaid Claims and Claims Adjustment Expense, Net	3,248
Commercial - General Liability [Member] | Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	504	497	492	481	$ 458	$ 413	$ 328	$ 236	$ 130	$ 30
Commercial - General Liability [Member] | Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	567	560	550	528	473	390	261	129	$ 31
Commercial - General Liability [Member] | Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	584	557	532	486	392	270	112	$ 33
Commercial - General Liability [Member] | Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	608	577	530	414	267	139	$ 27
Commercial - General Liability [Member] | Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	534	484	389	253	135	$ 27
Commercial - General Liability [Member] | Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	417	340	233	127	$ 27
Commercial - General Liability [Member] | Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	377	257	135	$ 33
Commercial - General Liability [Member] | Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	245	115	$ 29
Commercial - General Liability [Member] | Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	132	$ 31
Commercial - General Liability [Member] | Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 34

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Strengthening or Releasing of Prior Accident Year Reserves Commercial - General Liability (Details) - Commercial - General Liability [Member] - USD ($) $ in Millions	12 Months Ended									24 Months Ended	36 Months Ended	48 Months Ended	60 Months Ended	72 Months Ended	84 Months Ended	96 Months Ended	108 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ (21)	$ (46)	$ 99
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development Prior Years	(7)	13	(54)
Net prior year claim and allocated claim adjustment expense reserve development, General Liability	(28)	(33)	45
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(8)	3	(14)	$ (41)	$ (10)	$ (29)	$ (39)	$ 5	$ (101)								$ (234)
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(9)	(13)	(19)	(1)	(14)	17	26	$ (7)								$ (20)
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	3	(4)	(6)	(4)	(1)	(3)	$ 46								$ 31
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(16)	(20)	46	50	2	$ 31								$ 93
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	10	1	46	30	$ (3)								$ 84
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(12)	(9)	16	$ 24								$ 19
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	9	(11)	$ 30								$ 28
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	1	$ 7								$ 8
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ 1

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Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Incurred Claims and Allocated Claim Adjustment Expenses Commercial - Workers Compensation (Details) - Commercial - Workers Compensation [Member] $ in Millions	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2007 USD ($)
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1,068
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 5,875
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	71,049
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 32
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 627	$ 608	$ 610	$ 604	$ 603	$ 603	$ 604	$ 596	$ 580	$ 568
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	59,883
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 36
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 638	630	622	612	608	606	593	575	$ 558
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	51,111
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 46
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 625	617	611	600	596	594	587	$ 583
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	48,056
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 45
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 717	697	683	663	641	619	$ 576
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	44,571
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 52
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 666	642	648	637	628	$ 593
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	41,683
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 86
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 671	661	648	616	$ 589
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	38,102
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 121
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 610	584	563	$ 528
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	32,996
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 157
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 474	474	$ 459
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	31,296
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 206
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 426	$ 416
Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	27,042
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 287
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 421

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Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Cumulative Paid Claim and Claim Adjustment Expenses Commercial - Workers Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	$ 4,167	$ 4,089	$ 4,355
Liability for Unpaid Claims and Claims Adjustment Expense, Net	18,249	18,576	18,927	$ 19,117
Commercial - Workers Compensation [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	3,877
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	1,998
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	2,334
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item	(30)
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense	4
Liability for Unpaid Claims and Claims Adjustment Expense, Net	4,306
Short-duration Insurance Contracts, Accident Year 2007 [Member] | Commercial - Workers Compensation [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	535	533	522	502	$ 471	$ 429	$ 390	$ 337	$ 246	$ 100
Short-duration Insurance Contracts, Accident Year 2008 [Member] | Commercial - Workers Compensation [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	520	505	489	461	425	381	323	233	$ 92
Short-duration Insurance Contracts, Accident Year 2009 [Member] | Commercial - Workers Compensation [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	516	495	468	435	381	315	223	$ 88
Short-duration Insurance Contracts, Accident Year 2010 [Member] | Commercial - Workers Compensation [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	565	531	500	433	352	245	$ 94
Short-duration Insurance Contracts, Accident Year 2011 [Member] | Commercial - Workers Compensation [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	515	471	432	353	245	$ 97
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Commercial - Workers Compensation [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	465	411	338	229	$ 86
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Commercial - Workers Compensation [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	366	297	211	$ 79
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Commercial - Workers Compensation [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	213	157	$ 60
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Commercial - Workers Compensation [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	130	$ 50
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Commercial - Workers Compensation [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 52

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Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Strengthening or Releasing of Prior Accident Year Reserves Commercial - Workers Compensation (Details) - Commercial - Workers Compensation [Member] - USD ($) $ in Millions	12 Months Ended									24 Months Ended	36 Months Ended	48 Months Ended	60 Months Ended	72 Months Ended	84 Months Ended	96 Months Ended	108 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ 125	$ 69	$ 125
Short-duration Insurance Contracts, Discounted Liabilities, Aggregate Discount	1	(4)	1
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development Prior Years	24	15	13
Net prior year claim and allocated claim adjustment expense reserve development, Workers' Compensation	150	80	139
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	19	(2)	6	$ 1	$ 0	$ (1)	$ 8	$ 16	$ 12								$ 59
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	8	8	10	4	2	13	18	$ 17								$ 80
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	8	6	11	4	2	7	$ 4								$ 42
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	20	14	20	22	22	$ 43								$ 141
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	24	(6)	11	9	$ 35								$ 73
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	10	13	32	$ 27								$ 82
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	26	21	$ 35								$ 82
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	0	$ 15								$ 15
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ 10

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Claim and Claim Adjustment Expense Reserves Net prior year claim and allocated claim adjustment expense reserve development for International segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development, excluding Life & Group	$ (288)	$ (210)	$ (21)
International [Member]
Net prior year claim and allocated claim adjustment expense reserve development, Medical Professional Liability	(5)	(9)	(7)
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development, Other Professional Liability	12	(16)	(26)
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development, Liability	(30)	(17)	(13)
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development, Property & Marine	(34)	(29)	(4)
Net prior year claim and allocated claim adjustment expense reserve development, Other	(1)	17	(9)
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development, excluding Life & Group	$ (58)	$ (54)	$ (59)

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Claim and Claim Adjustment Expense Reserves Short Duration Contracts - International Reconciliation (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	$ 18,249	$ 18,576	$ 18,927	$ 19,117
International Excluding Hardy [Member] [Domain]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	881
Hardy [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	320
International [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	$ 1,201	$ 1,219

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Incurred Claims and Allocated Claim Adjustment Expenses - International Excluding Hardy (Details) - International Excluding Hardy [Member] $ in Millions	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2007 USD ($)
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 484
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 2,342
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	27,149
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 4
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 159	$ 160	$ 162	$ 164	$ 172	$ 181	$ 194	$ 213	$ 219	$ 204
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	25,119
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 7
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 207	210	209	200	207	207	214	226	$ 223
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	21,362
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 13
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 213	222	231	234	247	247	245	$ 249
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	22,877
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 18
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 190	196	203	211	217	223	$ 226
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	25,361
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 14
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 216	223	233	253	260	$ 259
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	25,306
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 34
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 244	245	252	266	$ 259
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	23,999
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 56
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 256	275	282	$ 281
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	24,859
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 82
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 284	284	$ 269
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	22,873
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 107
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 297	$ 282
Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Number of Reported Claims per Million of Net Earned Premium	15,564
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 149
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 276

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Cumulative Paid Claim and Claim Adjustment Expenses International Excluding Hardy (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	$ 4,167	$ 4,089	$ 4,355
Liability for Unpaid Claims and Claims Adjustment Expense, Net	18,249	18,576	18,927	$ 19,117
International Excluding Hardy [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	1,521
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	821
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	38
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense	22
Liability for Unpaid Claims and Claims Adjustment Expense, Net	881
Short-duration Insurance Contracts, Accident Year 2007 [Member] | International Excluding Hardy [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	152	150	148	144	$ 140	$ 133	$ 124	$ 112	$ 99	$ 31
Short-duration Insurance Contracts, Accident Year 2008 [Member] | International Excluding Hardy [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	190	172	165	151	143	135	126	84	$ 34
Short-duration Insurance Contracts, Accident Year 2009 [Member] | International Excluding Hardy [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	181	170	159	149	134	119	90	$ 38
Short-duration Insurance Contracts, Accident Year 2010 [Member] | International Excluding Hardy [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	160	151	143	130	115	93	$ 47
Short-duration Insurance Contracts, Accident Year 2011 [Member] | International Excluding Hardy [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	171	159	146	133	111	$ 44
Short-duration Insurance Contracts, Accident Year 2012 [Member] | International Excluding Hardy [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	176	161	142	109	$ 42
Short-duration Insurance Contracts, Accident Year 2013 [Member] | International Excluding Hardy [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	152	135	109	$ 49
Short-duration Insurance Contracts, Accident Year 2014 [Member] | International Excluding Hardy [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	145	119	$ 51
Short-duration Insurance Contracts, Accident Year 2015 [Member] | International Excluding Hardy [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	130	$ 55
Short-duration Insurance Contracts, Accident Year 2016 [Member] | International Excluding Hardy [Member]
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 64

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Strengthening or Releasing of Prior Accident Year Reserves International Excluding Hardy (Details) - International Excluding Hardy [Member] - USD ($) $ in Millions	12 Months Ended									24 Months Ended	36 Months Ended	48 Months Ended	60 Months Ended	72 Months Ended	84 Months Ended	96 Months Ended	108 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ (1)	$ (2)	$ (2)	$ (8)	$ (9)	$ (13)	$ (19)	$ (6)	$ 15								$ (45)
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(3)	1	9	(7)	0	(7)	(12)	$ 3								$ (16)
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(9)	(9)	(3)	(13)	0	2	$ (4)								$ (36)
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(6)	(7)	(8)	(6)	(6)	$ (3)								$ (36)
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(7)	(10)	(20)	(7)	$ 1								$ (43)
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(1)	(7)	(14)	$ 7								$ (15)
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(19)	(7)	$ 1								$ (25)
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	0	$ 15								$ 15
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ 15

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Net Incurred Claims and Allocated Claim Adjustment Expenses - International - Hardy (Details) - Hardy [Member] $ in Millions	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 1,030
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	310
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	123
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	15	$ 10	$ 16	$ 11	$ 7
Net Claim and Claim Adjustment Expense Reserves at Acquisition					5
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					12
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Number of Reported Claims per Million of Net Earned Premium	4,249
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 13	13	12	11	(4)
Net Claim and Claim Adjustment Expense Reserves at Acquisition					18
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					14
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Number of Reported Claims per Million of Net Earned Premium	4,234
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ (2)	1	(4)	6	1
Net Claim and Claim Adjustment Expense Reserves at Acquisition					11
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					12
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Number of Reported Claims per Million of Net Earned Premium	3,840
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 50	44	50	46	(10)
Net Claim and Claim Adjustment Expense Reserves at Acquisition					46
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					36
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Number of Reported Claims per Million of Net Earned Premium	4,495
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 132	134	130	130	0
Net Claim and Claim Adjustment Expense Reserves at Acquisition					121
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					121
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ (2)
Number of Reported Claims per Million of Net Earned Premium	6,193
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 110	117	110	102	69
Net Claim and Claim Adjustment Expense Reserves at Acquisition					33
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					$ 102
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ (1)
Number of Reported Claims per Million of Net Earned Premium	6,758
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 137	136	144	$ 127
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Number of Reported Claims per Million of Net Earned Premium	7,392
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 174	180	$ 182
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 7
Number of Reported Claims per Million of Net Earned Premium	7,656
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 176	$ 187
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 18
Number of Reported Claims per Million of Net Earned Premium	7,669
Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 225
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 101
Number of Reported Claims per Million of Net Earned Premium	5,274

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts – Net Cumulative Paid Claim and Claim Adjustment Expenses - International - Hardy (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	$ 4,167	$ 4,089	$ 4,355
Liability for Unpaid Claims and Claims Adjustment Expense, Net	18,249	18,576	18,927	$ 19,117
Hardy [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	720
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	310
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	3
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense	7
Liability for Unpaid Claims and Claims Adjustment Expense, Net	320
Hardy [Member] | Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	14	14	14	14	$ 3
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					12
Hardy [Member] | Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	11	10	10	14	3
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					14
Hardy [Member] | Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	(4)	(4)	(4)	(2)	1
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					12
Hardy [Member] | Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	45	43	41	34	19
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					36
Hardy [Member] | Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	127	123	119	80	29
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					121
Hardy [Member] | Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	104	107	98	78	14
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net					$ 102
Hardy [Member] | Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	125	119	100	$ 37
Hardy [Member] | Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	139	121	$ 55
Hardy [Member] | Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	97	$ 29
Hardy [Member] | Short-duration Insurance Contracts, Accident Year 2016 [Member]
Short Duration Contracts Net Cumulative Paid Claim Adjustment Expenses [Line Items]
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 62

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts – Net Strengthening or Releasing of Prior Accident Year Reserves - International - Hardy (Details) - Hardy [Member] - USD ($) $ in Millions	12 Months Ended					24 Months Ended	36 Months Ended	48 Months Ended	60 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016
Short-duration Insurance Contracts, Accident Year 2007 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ 5	$ (6)	$ 5	$ (1)	$ 7				$ 10
Short-duration Insurance Contracts, Accident Year 2008 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	0	1	1	(3)	(4)				(5)
Short-duration Insurance Contracts, Accident Year 2009 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(3)	5	(10)	(6)	1				(13)
Short-duration Insurance Contracts, Accident Year 2010 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	6	(6)	4	10	(10)				4
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(2)	4	0	9	$ 0				$ 11
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(7)	7	8	$ 0				$ 8
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	1	(8)	$ 17				$ 10
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	(6)	$ (2)				$ (8)
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development	$ (11)

XML

Claim and Claim Adjustment Expense Reserves Short Duration Contracts - Consolidated Reconciliation (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	$ 18,249	$ 18,576	$ 18,927	$ 19,117
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	4,094
Total Gross Carried Claim and Claim Adjustment Expense Reserves	22,343	22,663	$ 23,271	$ 24,089
Specialty [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	5,404	5,568
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	745
Total Gross Carried Claim and Claim Adjustment Expense Reserves	6,149	6,269
Commercial [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	8,305	8,576
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	589
Total Gross Carried Claim and Claim Adjustment Expense Reserves	8,894	9,183
International [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	1,201	1,219
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	127
Total Gross Carried Claim and Claim Adjustment Expense Reserves	1,328	1,347
Corporate and Other [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	230	283
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	2,384
Total Gross Carried Claim and Claim Adjustment Expense Reserves	2,614	2,644
Life and Group Non-Core [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Net	3,109	2,930
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	249
Total Gross Carried Claim and Claim Adjustment Expense Reserves	$ 3,358	$ 3,220

XML

Claim and Claim Adjustment Expense Reserves Short-Duration Contracts - Historical Claims Duration (Details)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Specialty - Medical Professional Liability [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One										3.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two									18.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three								22.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four							19.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five						12.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six					8.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven				5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight			4.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine		3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.30%
Short-Duration Insurance Contracts, Historical Claims Duration, Net	97.70%
Specialty - Other Professional and Management Liability [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One										5.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two									20.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three								21.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four							17.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five						10.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six					6.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven				5.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight			3.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine		1.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	3.20%
Short-Duration Insurance Contracts, Historical Claims Duration, Net	95.10%
Specialty - Surety [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One										23.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two									32.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three								20.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four							8.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five						3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six					1.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven				(0.70%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight			2.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine		1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	2.00%
Short-Duration Insurance Contracts, Historical Claims Duration, Net	94.80%
Commercial - Auto [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One										27.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two									23.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three								18.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four							13.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five						9.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six					3.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven				1.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight			0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine		0.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.30%
Short-Duration Insurance Contracts, Historical Claims Duration, Net	97.60%
Commercial - General Liability [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One										5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two									16.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three								20.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four							20.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five						15.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six					8.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven				4.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight			2.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine		1.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	1.30%
Short-Duration Insurance Contracts, Historical Claims Duration, Net	94.50%
Commercial - Workers Compensation [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One										13.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two									21.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three								14.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four							10.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five						7.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six					5.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven				4.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight			3.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine		2.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.30%
Short-Duration Insurance Contracts, Historical Claims Duration, Net	83.20%
International Excluding Hardy [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One										19.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two									27.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three								12.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four							6.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five						5.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six					4.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven				4.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight			3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine		5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	1.30%
Short-Duration Insurance Contracts, Historical Claims Duration, Net	91.00%
Hardy [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One										25.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two									40.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three								12.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four							4.40%
Short-Duration Insurance Contracts, Historical Claims Duration, Net	83.10%

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Claim and Claim Adjustment Expense Reserves (Impact of Loss Portfolio Transfer on the Consolidated Statement of Operations) (Details) - Loss Portfolio Transfer [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net AEP adverse development before consideration of LPT	$ 200	$ 200	$ 150	$ 0
Retroactive reinsurance benefit recognized		(107)	(85)	(13)
Pretax impact of deferred retroactive reinsurance benefit		$ 93	$ 65	$ (13)

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Legal Proceedings, Commitments and Contingencies, and Guarantees (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Reduction to Earned Premium due to the Small Business Premium Rate Adjustment Contingency	$ 16
Expected Premium Refund Related to the Small Business Premium Rate Adjustment Contingency	30
Property Lease Guarantee [Member]
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	11
Guarantee and Indemnification [Member]
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Guarantor Obligations, Current Carrying Value	5	$ 5
Guarantee agreement [Member]
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	375
Indemnification Agreement [Member]
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	258
Guarantee Obligations [Member]
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 1,900

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Reinsurance (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Funds held under reinsurance agreements, liability	$ 3,000	$ 3,200
Reinsurance recoveries reported in insurance claims and policyholders' benefits reported on the Consolidated Statement of Operations	3,016	2,601	$ 1,379
Subsidiaries of Berkshire Hathaway Group [Member]
Largest Recoverables From Single Reinsurer	2,353
Gateway Rivers Insurance Company [Member]
Largest Recoverables From Single Reinsurer	350
Subsidiaries of Wilton Re[Member]
Largest Recoverables From Single Reinsurer	212
Significant Captive Program [Member]
Direct and ceded earned premiums	3,865	3,344	2,643
Reinsurance recoveries reported in insurance claims and policyholders' benefits reported on the Consolidated Statement of Operations	$ 2,621	$ 2,282	$ 1,458

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Reinsurance (Components of Reinsurance Receivables) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reinsurance receivables related to insurance reserves
Ceded claim and claim adjustment expenses	$ 4,094	$ 4,087	$ 4,344	$ 4,972
Ceded future policy benefits	212	207
Reinsurance receivables related to paid losses	147	197
Reinsurance receivables	4,453	4,491
Allowance for uncollectible reinsurance	(37)	(38)
Reinsurance receivables, net of allowance for uncollectible reinsurance	$ 4,416	$ 4,453

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Reinsurance (Components of Earned Premiums) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Direct premiums earned	$ 10,886	$ 10,351	$ 9,960
Assumed premiums earned	308	324	325
Ceded premiums earned	4,270	3,754	3,073
Net earned premiums	6,924	6,921	7,212
Property and Casualty Insurance [Member]
Direct premiums earned	10,400	9,853	9,452
Assumed premiums earned	258	274	277
Ceded premiums earned	4,270	3,754	3,073
Net earned premiums	6,388	6,373	6,656
Long term care Insurance Product Line [Member]
Direct premiums earned	486	498	508
Assumed premiums earned	50	50	48
Ceded premiums earned	0	0	0
Net earned premiums	$ 536	$ 548	$ 556
Percentage of assumed premiums earned to net premiums earned [Member]
Percentage of assumed premium earned to premium earned net	4.40%	4.70%	4.50%
Percentage of assumed premiums earned to net premiums earned [Member] | Property and Casualty Insurance [Member]
Percentage of assumed premium earned to premium earned net	4.00%	4.30%	4.20%
Percentage of assumed premiums earned to net premiums earned [Member] | Long term care Insurance Product Line [Member]
Percentage of assumed premium earned to premium earned net	9.30%	9.10%	8.60%

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Reinsurance (Components of Written Premiums) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Direct premiums written	$ 10,946	$ 10,345	$ 9,787
Assumed premiums written	297	319	325
Ceded premiums written	4,255	3,702	3,024
Net written premiums	6,988	6,962	7,088
Property and Casualty Insurance [Member]
Direct premiums written	10,451	9,852	9,283
Assumed premiums written	245	270	276
Ceded premiums written	4,255	3,702	3,024
Net written premiums	6,441	6,420	6,535
Long term care Insurance Product Line [Member]
Direct premiums written	495	493	504
Assumed premiums written	52	49	49
Ceded premiums written	0	0	0
Net written premiums	$ 547	$ 542	$ 553
Percentage of assumed premiums written to net premiums written [Member]
Percentage of assumed premium written to premium written net	4.30%	4.60%	4.60%
Percentage of assumed premiums written to net premiums written [Member] | Property and Casualty Insurance [Member]
Percentage of assumed premium written to premium written net	3.80%	4.20%	4.20%
Percentage of assumed premiums written to net premiums written [Member] | Long term care Insurance Product Line [Member]
Percentage of assumed premium written to premium written net	9.50%	9.00%	8.90%

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Debt (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Federal Home Loan Bank Stock	$ 5
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	111
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	0	$ 0
Line of Credit, Current borrowing capacity	250
Additional borrowing capacity available	100
Line of Credit, Minimum Net Worth Required for Compliance	8,700
Line of Credit, Amount Outstanding	$ 0	$ 0

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Debt (Schedule of debt instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Long term debt	$ 2,710	$ 2,210
Total debt	2,710	2,560
Senior notes 6.950%, face amount $150, due January 15, 2018
Long term debt	150	150
Senior notes 7.350%, face amount $350, due November 15, 2019
Long term debt	349	349
Senior notes 5.875%, face amount $500, due August 15, 2020
Long term debt	498	497
Senior notes 5.750%, face amount $400, due August 15, 2021
Long term debt	398	397
Senior Notes, 3.950%, face amount of $550, due May 15, 2024
Long term debt	546	546
Senior Notes, 4.500%, face amount of $500, due March 1, 2026
Long term debt	498	0
Debenture of CNAF, 7.250%, face amount of $243, due November 15, 2023
Long term debt	241	241
Subordinated variable rate debt of Hardy, face amount of $30, due September 15, 2036
Long term debt	30	30
Senior notes 6.500%, face amount of $350, due August 15, 2016 [Member]
Short term debt	$ 0	$ 350

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Debt (Maturity of debt) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Repayments of principal in the next twelve months	$ 0
Repayments of principal in year two	150
Repayments of principal in year three	350
Repayments of principal in year four	500
Repayments of principal in year five	400
Repayments of principal after year five	1,323
Less discount	(13)
Total debt	$ 2,710	$ 2,560

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Benefit Plans Benefit Plans (Narrative) (details) - USD ($) $ in Millions	6 Months Ended				12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Curtailments						$ 55
Lump sum settlement acceptance rate by retirement plan participants			20.00%				20.00%
Lump sum pension settlement payment							$ 253
Settlement loss							84
Curtailment gain							86
Future capital call commitments for limited partnership investments					$ 380
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments	70.00%				68.00%	70.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent					50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match					70.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay					6.00%
Defined Contribution Plan, Employers Matching Contribution, Vesting Period in Years					5 years
Company Contribution of Eligible Compensation, Depending on Age, Percent					3% or 5%
Benefit expense for the Company's savings plan					$ 75	$ 71	$ 69
Additional Contribution, Management Discretion [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match					80.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay					6.00%
Defined Contribution Plan, Employers Matching Contribution, Vesting Period in Years					5 years
Defined Contribution Plan, Employer Discretionary Contribution Amount, Percent					2.00%
First Year of Employment [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match					35.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay					6.00%
Pension Plans, Defined Benefit [Member]
Settlement through group annuity purchase					$ 88	0
Decrease in Benefit Obligation due to settlement					$ 86	0
Discount rate	4.00%	3.85%			4.15%		4.65%
Settlement loss					$ 0	0	$ 84
Defined benefit plan, accumulated benefit obligation	$ 2,821				2,729	$ 2,821
Future capital call commitments for limited partnership investments					$ 113
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments	87.00%				86.00%	87.00%
Limited partnership equity related hedge fund strategy plan assets					57.00%
Limited partnership hedge fund multi strategy plan assets					38.00%
Limited partnership hedge fund strategy distressed investments plan assets					5.00%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year					$ 12
Cost of Living Adjustment [Member]
Assumptions used in calculating assumed health care cost trend rate					4.00%
Employer Subsidy on Health Care Costs [Member]
Assumptions used in calculating assumed health care cost trend rate					4.00%
Other Postretirement Benefit Plan [Member]
Settlement through group annuity purchase					$ 0	$ 0
Decrease in Benefit Obligation due to settlement					$ 0	$ 0
Discount rate			3.10%	3.60%	2.75%	2.50%
Curtailment gain					$ 0	$ 0	$ 86
Defined benefit plan, health care cost trend rate assumed for next fiscal year					4.00%	4.00%	4.00%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year					$ 3
Equity securities [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum					40.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum					60.00%

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Benefit Plans (Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Defined Benefit Plan, Assets for Plan Benefits	$ 2,193	$ 2,267
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	2,821	3,019
Service cost	0	4	$ 9
Interest cost	113	112	132
Participants' contributions	0	0
Plan amendments	0	(55)
Actuarial (gain) loss	68	(79)
Benefits paid	(173)	(173)
Foreign currency translation and other	(14)	(7)
Decrease in Benefit Obligation due to settlement	(86)	0
Benefit obligation at December 31	2,729	2,821	3,019
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	2,267	2,456
Actual return on plan assets	193	(18)
Company contributions	9	10
Participants' contributions	0	0
Benefits paid	(173)	(173)
Foreign currency translation and other	(15)	(8)
Settlement through group annuity purchase	(88)	0
Fair value of plan assets at December 31	2,193	2,267	2,456
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status	(536)	(554)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Defined Benefit Plan, Assets for Plan Benefits	4	12
Other liabilities	(540)	(566)
Net amount recognized on balance sheets	(536)	(554)
Amounts recognized in Accumulated other comprehensive income not yet recognized in net periodic cost (benefit)[Abstract]
Prior service credit	0	0
Net actuarial (gain) loss	999	999
Net amount recognized in Accumulated other comprehensive income	999	999
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	23	29
Service cost	0	0
Interest cost	0	1	1
Participants' contributions	4	4
Plan amendments	0	0
Actuarial (gain) loss	(6)	(3)
Benefits paid	(7)	(8)
Foreign currency translation and other	1	0
Decrease in Benefit Obligation due to settlement	0	0
Benefit obligation at December 31	15	23	29
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Company contributions	3	4
Participants' contributions	4	4
Benefits paid	(7)	(8)
Foreign currency translation and other	0	0
Settlement through group annuity purchase	0	0
Fair value of plan assets at December 31	0	0	$ 0
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status	(15)	(23)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Defined Benefit Plan, Assets for Plan Benefits	0	0
Other liabilities	(15)	(23)
Net amount recognized on balance sheets	(15)	(23)
Amounts recognized in Accumulated other comprehensive income not yet recognized in net periodic cost (benefit)[Abstract]
Prior service credit	(4)	(6)
Net actuarial (gain) loss	(3)	3
Net amount recognized in Accumulated other comprehensive income	$ (7)	$ (3)

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Benefit Plans (Components of net periodic cost (benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Settlement loss			$ 84
Curtailment gain			(86)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 4	9
Interest cost on projected benefit obligation	113	112	132
Expected return on plan assets	(160)	(174)	(191)
Amortization of net actuarial (gain) loss	37	34	25
Settlement loss	0	0	84
Net periodic (benefit) cost	(10)	(24)	59
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost on projected benefit obligation	0	1	1
Amortization of prior service credit	(2)	(3)	(10)
Amortization of net actuarial (gain) loss	0	1	1
Curtailment gain	0	0	(86)
Net periodic (benefit) cost	$ (2)	$ (1)	$ (94)

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Benefit Plans (Schedule of amounts recognized in Other comprehensive income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Amounts arising during the period	$ (29)	$ (111)	$ (337)
Curtailment and other	0	56	(81)
Settlement through group annuity purchase	0	0	84
Reclassification adjustment relating to prior service cost (credit)	(2)	(3)	(10)
Reclassification adjustment relating to actuarial (gain) loss	37	35	26
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Settlements Through Group Annuity Purchase, before Tax	(2)	0	0
Total increase (decrease) in Other comprehensive income	$ 4	$ (23)	$ (318)

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Benefit Plans (Schedule of estimated amounts to be recognized from Accumulated other comprehensive income into net periodic cost (benefit) during next fiscal year) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)	$ 0
Amortization of net actuarial (gain) loss	36
Total estimated amounts to be recognized	36
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)	(2)
Amortization of net actuarial (gain) loss	0
Total estimated amounts to be recognized	$ (2)

XML

Benefit Plans (Actuarial Assumptions for Benefit Obligations) (Details)	Dec. 31, 2016	Dec. 31, 2015
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.95%	4.15%
Expected long term rate of return	7.50%	7.50%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.75%	2.75%

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Benefit Plans (Actuarial Assumptions for Net Cost or Benefit) (Details)	6 Months Ended				12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.00%	3.85%			4.15%		4.65%
Expected long term rate of return					7.50%	7.50%	7.50%
Rate of compensation increases						3.92%	3.99%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			3.10%	3.60%	2.75%	2.50%

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Benefit Plans (Fair Value of Plan Assets Measured on a Recurring Basis) (Details) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assets for Plan Benefits		$ 2,193	$ 2,267
Corporate and other bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		510	465
Corporate and other bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Corporate and other bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		500	455
Corporate and other bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		10	10	$ 15
States, municipalities and political subdivisions [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		63	106
States, municipalities and political subdivisions [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
States, municipalities and political subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		63	106
States, municipalities and political subdivisions [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Residential mortgage-backed [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		109	133
Residential mortgage-backed [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Residential mortgage-backed [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		109	133
Residential mortgage-backed [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Commercial Mortgage Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		66	69
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		66	69
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Other asset-backed [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4	11
Other asset-backed [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Other asset-backed [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4	11
Other asset-backed [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Total asset-backed [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		179	213
Total asset-backed [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Total asset-backed [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		179	213
Total asset-backed [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Fixed Maturities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		752	784
Fixed Maturities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Fixed Maturities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		742	774
Fixed Maturities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		10	10	15
Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		468	443
Equity securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		363	336
Equity securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		105	107
Equity securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Derivative Financial Instruments, Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	1
Derivative Financial Instruments, Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	1
Derivative Financial Instruments, Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Derivative Financial Instruments, Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Short-term Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		46	52
Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		11	24
Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		35	28
Short-term Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Other assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		37	52
Other assets [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Other assets [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		37	52
Other assets [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		14
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		14
Cash [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Cash [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Total assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1,317	1,332
Total assets [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		388	361
Total assets [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		919	961
Total assets [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		10	10	$ 15
Total limited partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assets for Plan Benefits	[1]	$ 876	$ 935

[1] (1) In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.

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Benefit Plans (Reconciliation of Level 3 Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fixed Maturities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	$ 784
Fair value of plan assets at December 31	752	$ 784
Corporate and other bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	465
Fair value of plan assets at December 31	510	465
Total assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	1,332
Fair value of plan assets at December 31	1,317	1,332
Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	10	15
Defined Benefit Plan, Actual Return on Plan Assets Still Held	0	0
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	0	0
Defined Benefit Plan, Purchases, Sales, and Settlements	0	0
Defined Benefit Plan, Net transfers into (out of) Level 3	0	(5)
Fair value of plan assets at December 31	10	10
Fair Value, Inputs, Level 3 [Member] | Corporate and other bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	10	15
Defined Benefit Plan, Actual Return on Plan Assets Still Held	0	0
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	0	0
Defined Benefit Plan, Purchases, Sales, and Settlements	0	0
Defined Benefit Plan, Net transfers into (out of) Level 3	0	(5)
Fair value of plan assets at December 31	10	10
Fair Value, Inputs, Level 3 [Member] | Total assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	10	15
Defined Benefit Plan, Actual Return on Plan Assets Still Held	0	0
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	0	0
Defined Benefit Plan, Purchases, Sales, and Settlements	0	0
Defined Benefit Plan, Net transfers into (out of) Level 3	0	(5)
Fair value of plan assets at December 31	$ 10	$ 10

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Benefit Plans (Estimated Future Minimum Benefit Payments to Participants) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	$ 178
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	178
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	177
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	178
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	178
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	883
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	3
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	2
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	2
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	2
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	2
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	$ 3

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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	11,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	3,700,000
Allocated Share-based Compensation Expense	$ 36	$ 14	$ 11
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	12	$ 5	4
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 32
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 10 months 24 days
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period Following Date of Grant, in Years	two or three
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period Following Date of Grant, in Years	4
Range of Shares Initially Granted Payable Based Upon Attainment of Specific Annual Performance Goals	0% to 100%
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period Following Date of Grant, in Years	4
Stock Options and SARs, Maximum Term Following Date of Grant, in Years	10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,000,000
Fair Value of Stock Based Awards Vested			$ 1
Long Term Incentive Plan [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Shares Initially Granted Payable Based Upon Attainment of Specific Annual Performance Goals	0% to 200%
Measurement Period of Specific Annual Performance Goals, in Years	3
Annual Performance Share Plan [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Shares Initially Granted Payable Based Upon Attainment of Specific Annual Performance Goals	0% to 200%
Measurement Period of Specific Annual Performance Goals, in Years	1
Cliff Vesting Period Following Date of Grant	2
Special Supplemental Equity Awards [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service Based Vesting Period	2

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Stock-Based Compensation (Restricted shares, performance-based restricted share units and performance share unit activity) (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of nonvested awards at January 1 | shares	735,263
Weighted average grant date fair value of nonvested awards at January 1 | $ / shares	$ 36.53
Number of awards granted | shares	2,545,624
Weighted average grant date fair value of awards granted | $ / shares	$ 32.27
Number of awards vested | shares	(371,443)
Weighted average grant date fair value of awards vested | $ / shares	$ 33.33
Number of awards forfeited, canceled or expired | shares	(186,932)
Weighted average grant date fair value of awards forfeited, canceled or expired | $ / shares	$ 32.80
Performance-based adjustment | shares	(590,730)
Weighted average grant date fair value of performance based adjustment | $ / shares	$ 33.10
Number of nonvested awards at December 31 | shares	2,131,782
Weighted average grant date fair value of nonvested awards at December 31 | $ / shares	$ 33.28

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Schedule of Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amortization of deferred acquisition costs	$ 1,235	$ 1,540	$ 1,317
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	1
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1
Finite-Lived Intangible Assets, Amortization Expense, Year Five	1
International [Member]
Amortization of deferred acquisition costs	174	168	204
International [Member] | Other Intangible Assets [Member]
Amortization of deferred acquisition costs			2
Amortization expense included in other operating expenses	$ 1	$ 1	$ 1

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Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets	$ 64	$ 76
Indefinite-lived intangible assets	59	68
Intangible Assets, Gross (Excluding Goodwill)	123	144
Accumulated Amortization	54	63
Lloyds syndicate capacity [Member]
Indefinite-lived intangible assets	43	52
Agency Force [Member]
Indefinite-lived intangible assets	16	16
Value of business acquired [Member]
Finite-Lived Intangible Assets	48	57
Accumulated Amortization	$ 48	57
Trade name [Member]
Economic useful life measured in years	8 years
Finite-Lived Intangible Assets	$ 6	7
Accumulated Amortization	$ 3	3
Distribution channel [Member]
Economic useful life measured in years	15 years
Finite-Lived Intangible Assets	$ 10	12
Accumulated Amortization	$ 3	$ 3
Minimum [Member] | Value of business acquired [Member]
Economic useful life measured in years	1 year
Maximum [Member] | Value of business acquired [Member]
Economic useful life measured in years	4 years

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Operating Leases (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Leases, Operating [Abstract]
Operating Leases, Rent Expense	$ 60	$ 46	$ 55
Operating Leases, Income Statement, Sublease Revenue			$ 1
Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months	10
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years	$ 4

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Operating Leases (Future Minimum Lease Payments) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Leases, Operating [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 48
Operating Leases, Future Minimum Payments, Due in Two Years	37
Operating Leases, Future Minimum Payments, Due in Three Years	30
Operating Leases, Future Minimum Payments, Due in Four Years	33
Operating Leases, Future Minimum Payments, Due in Five Years	34
Operating Leases, Future Minimum Payments, Due Thereafter	244
Operating Leases, Future Minimum Payments Due	$ 426

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Stockholders' Equity and Statutory Accounting Practices (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Stockholders' Equity and Statutory Accounting Practices [Abstract]
Increase in statutory capital and surplus due to prescribed practice	$ 67	$ 90
Statutory Accounting Practices, Statutory Amount Available for Dividend Payment Before Consideration of Statutory Dividends Paid in the preceding twelve months	1,075
Statutory Accounting Practices, Dividends Paid in the preceding twelve months	$ 765
Capital Required for Capital Adequacy to Risk Weighted Assets	270.00%	266.00%

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Stockholders' Equity and Statutory Accounting Practices Combined statutory capital and surplus and net income (loss) (Details) - Combined Continental Casualty Companies [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 10,748	$ 10,723
Statutory net income (loss)	$ 1,033	$ 1,148	$ 914

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Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	$ (315)	$ 400
Other comprehensive income (loss), before reclassifications	163	(793)
Amounts reclassified from accumulated other comprehensive income (loss) after tax (expense) benefit	21	(78)
Other comprehensive income (loss) after tax (expense) benefit	142	(715)
Accumulated other comprehensive income (loss), ending balance	(173)	(315)
Reclassification from AOCI, Current Period, Tax	(7)	49
Tax (expense) benefit on other comprehensive income (loss)	(121)	295
Net unrealized gains (losses) on investments with OTTI losses [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	27	36
Other comprehensive income (loss), before reclassifications	9	(23)
Amounts reclassified from accumulated other comprehensive income (loss) after tax (expense) benefit	6	(14)
Other comprehensive income (loss) after tax (expense) benefit	3	(9)
Accumulated other comprehensive income (loss), ending balance	30	27
Reclassification from AOCI, Current Period, Tax	(3)	8
Tax (expense) benefit on other comprehensive income (loss)	(1)	5
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	390	942
Other comprehensive income (loss), before reclassifications	290	(595)
Amounts reclassified from accumulated other comprehensive income (loss) after tax (expense) benefit	38	(43)
Other comprehensive income (loss) after tax (expense) benefit	252	(552)
Accumulated other comprehensive income (loss), ending balance	642	390
Reclassification from AOCI, Current Period, Tax	(16)	30
Tax (expense) benefit on other comprehensive income (loss)	(117)	282
Pension and postretirement benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(648)	(633)
Other comprehensive income (loss), before reclassifications	(22)	(36)
Amounts reclassified from accumulated other comprehensive income (loss) after tax (expense) benefit	(23)	(21)
Other comprehensive income (loss) after tax (expense) benefit	1	(15)
Accumulated other comprehensive income (loss), ending balance	(647)	(648)
Reclassification from AOCI, Current Period, Tax	12	11
Tax (expense) benefit on other comprehensive income (loss)	(3)	8
Cumulative foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(84)	55
Other comprehensive income (loss), before reclassifications	(114)	(139)
Amounts reclassified from accumulated other comprehensive income (loss) after tax (expense) benefit	0	0
Other comprehensive income (loss) after tax (expense) benefit	(114)	(139)
Accumulated other comprehensive income (loss), ending balance	(198)	(84)
Reclassification from AOCI, Current Period, Tax	0	0
Tax (expense) benefit on other comprehensive income (loss)	$ 0	$ 0

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Business Segments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting [Abstract]
Percentage of direct foreign written premiums	7.90%	8.00%	8.80%

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Business Segments (Income Statement Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net written premiums	$ 6,988	$ 6,962	$ 7,088
Operating Revenues
Net earned premiums	6,924	6,921	7,212
Net Investment Income	1,988	1,840	2,067
Other revenues	404	407	356
Total operating revenues	9,316	9,168	9,635
Claims, Benefits and Expenses
Net incurred claims and benefits	5,270	5,372	5,577
Policyholders' dividends	13	12	14
Amortization of deferred acquisition costs	1,235	1,540	1,317
Other insurance related expenses	1,122	1,093	1,029
Other expenses	589	535	548
Total claims, benefits and expenses	8,229	8,552	8,485
Operating income (loss) from continuing operations before income tax	1,087	616	1,150
Income tax (expense) benefit on operating income (loss)	(263)	(101)	(301)
Net operating income (loss) from continuing operations	824	515	849
Net realized investment gains (losses), pre-tax	50	(67)	57
Income tax (expense) benefit on net realized investment gains (losses)	(15)	31	(18)
Net realized investment gains (losses), after tax	35	(36)	39
Net income (loss) from continuing operations	859	479	888
Specialty [Member]
Segment Reporting Information [Line Items]
Net written premiums	2,780	2,781	2,839
Operating Revenues
Net earned premiums	2,779	2,782	2,838
Net Investment Income	516	474	560
Other revenues	362	356	295
Total operating revenues	3,657	3,612	3,693
Claims, Benefits and Expenses
Net incurred claims and benefits	1,467	1,597	1,627
Policyholders' dividends	4	4	6
Amortization of deferred acquisition costs	591	589	592
Other insurance related expenses	301	278	262
Other expenses	312	301	254
Total claims, benefits and expenses	2,675	2,769	2,741
Operating income (loss) from continuing operations before income tax	982	843	952
Income tax (expense) benefit on operating income (loss)	(332)	(283)	(318)
Net operating income (loss) from continuing operations	650	560	634
Net realized investment gains (losses), pre-tax	5	(33)	15
Income tax (expense) benefit on net realized investment gains (losses)	(2)	11	(5)
Net realized investment gains (losses), after tax	3	(22)	10
Net income (loss) from continuing operations	653	538	644
Commercial [Member]
Segment Reporting Information [Line Items]
Net written premiums	2,841	2,818	2,817
Operating Revenues
Net earned premiums	2,804	2,788	2,906
Net Investment Income	638	593	723
Other revenues	32	37	38
Total operating revenues	3,474	3,418	3,667
Claims, Benefits and Expenses
Net incurred claims and benefits	1,927	1,814	2,187
Policyholders' dividends	9	8	8
Amortization of deferred acquisition costs	470	469	493
Other insurance related expenses	560	538	487
Other expenses	36	28	31
Total claims, benefits and expenses	3,002	2,857	3,206
Operating income (loss) from continuing operations before income tax	472	561	461
Income tax (expense) benefit on operating income (loss)	(161)	(192)	(154)
Net operating income (loss) from continuing operations	311	369	307
Net realized investment gains (losses), pre-tax	4	(47)	16
Income tax (expense) benefit on net realized investment gains (losses)	(2)	16	(6)
Net realized investment gains (losses), after tax	2	(31)	10
Net income (loss) from continuing operations	313	338	317
International [Member]
Segment Reporting Information [Line Items]
Net written premiums	821	822	880
Operating Revenues
Net earned premiums	806	804	913
Net Investment Income	51	52	61
Other revenues	0	(1)	0
Total operating revenues	857	855	974
Claims, Benefits and Expenses
Net incurred claims and benefits	492	479	488
Policyholders' dividends	0	0	0
Amortization of deferred acquisition costs	174	168	204
Other insurance related expenses	133	138	151
Other expenses	24	12	28
Total claims, benefits and expenses	823	797	871
Operating income (loss) from continuing operations before income tax	34	58	103
Income tax (expense) benefit on operating income (loss)	(13)	(21)	(34)
Net operating income (loss) from continuing operations	21	37	69
Net realized investment gains (losses), pre-tax	18	1	(1)
Income tax (expense) benefit on net realized investment gains (losses)	(3)	0	1
Net realized investment gains (losses), after tax	15	1	0
Net income (loss) from continuing operations	36	38	69
Life and Group Non-Core [Member]
Segment Reporting Information [Line Items]
Net written premiums	547	542	553
Operating Revenues
Net earned premiums	536	548	556
Net Investment Income	767	704	700
Other revenues	(2)	7	16
Total operating revenues	1,301	1,259	1,272
Claims, Benefits and Expenses
Net incurred claims and benefits	1,286	1,421	1,304
Policyholders' dividends	0	0	0
Amortization of deferred acquisition costs	0	314	28
Other insurance related expenses	132	142	130
Other expenses	8	11	30
Total claims, benefits and expenses	1,426	1,888	1,492
Operating income (loss) from continuing operations before income tax	(125)	(629)	(220)
Income tax (expense) benefit on operating income (loss)	145	315	151
Net operating income (loss) from continuing operations	20	(314)	(69)
Net realized investment gains (losses), pre-tax	25	(1)	7
Income tax (expense) benefit on net realized investment gains (losses)	(9)	9	0
Net realized investment gains (losses), after tax	16	8	7
Net income (loss) from continuing operations	36	(306)	(62)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net written premiums	0	1	1
Operating Revenues
Net earned premiums	0	1	1
Net Investment Income	16	17	23
Other revenues	12	11	12
Total operating revenues	28	29	36
Claims, Benefits and Expenses
Net incurred claims and benefits	98	61	(29)
Policyholders' dividends	0	0	0
Amortization of deferred acquisition costs	0	0	0
Other insurance related expenses	(3)	(1)	1
Other expenses	209	186	210
Total claims, benefits and expenses	304	246	182
Operating income (loss) from continuing operations before income tax	(276)	(217)	(146)
Income tax (expense) benefit on operating income (loss)	98	80	54
Net operating income (loss) from continuing operations	(178)	(137)	(92)
Net realized investment gains (losses), pre-tax	(2)	13	20
Income tax (expense) benefit on net realized investment gains (losses)	1	(5)	(8)
Net realized investment gains (losses), after tax	(1)	8	12
Net income (loss) from continuing operations	(179)	(129)	(80)
Eliminations [Member]
Segment Reporting Information [Line Items]
Net written premiums	(1)	(2)	(2)
Operating Revenues
Net earned premiums	(1)	(2)	(2)
Net Investment Income	0	0	0
Other revenues	0	(3)	(5)
Total operating revenues	(1)	(5)	(7)
Claims, Benefits and Expenses
Net incurred claims and benefits	0	0	0
Policyholders' dividends	0	0	0
Amortization of deferred acquisition costs	0	0	0
Other insurance related expenses	(1)	(2)	(2)
Other expenses	0	(3)	(5)
Total claims, benefits and expenses	(1)	(5)	(7)
Operating income (loss) from continuing operations before income tax	0	0	0
Income tax (expense) benefit on operating income (loss)	0	0	0
Net operating income (loss) from continuing operations	0	0	0
Net realized investment gains (losses), pre-tax	0	0	0
Income tax (expense) benefit on net realized investment gains (losses)	0	0	0
Net realized investment gains (losses), after tax	0	0	0
Net income (loss) from continuing operations	$ 0	$ 0	$ 0

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Business Segments (Balance Sheet Information) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Reinsurance receivables	$ 4,453	$ 4,491
Insurance receivables	2,255	2,129
Deferred acquisition costs	600	598
Goodwill	145	150
Insurance reserves
Claim and claim adjustment expenses	22,343	22,663
Unearned premiums	3,762	3,671
Future policy benefits	10,326	10,152
Specialty [Member]
Segment Reporting Information [Line Items]
Reinsurance receivables	760	724
Insurance receivables	982	890
Deferred acquisition costs	310	307
Goodwill	117	117
Insurance reserves
Claim and claim adjustment expenses	6,149	6,269
Unearned premiums	1,911	1,839
Future policy benefits	0	0
Commercial [Member]
Segment Reporting Information [Line Items]
Reinsurance receivables	621	639
Insurance receivables	1,021	993
Deferred acquisition costs	214	213
Goodwill	0	0
Insurance reserves
Claim and claim adjustment expenses	8,894	9,183
Unearned premiums	1,323	1,297
Future policy benefits	0	0
International [Member]
Segment Reporting Information [Line Items]
Reinsurance receivables	131	144
Insurance receivables	233	233
Deferred acquisition costs	76	78
Goodwill	28	33
Insurance reserves
Claim and claim adjustment expenses	1,328	1,347
Unearned premiums	396	415
Future policy benefits	0	0
Life and Group Non-Core [Member]
Segment Reporting Information [Line Items]
Reinsurance receivables	462	497
Insurance receivables	17	11
Deferred acquisition costs	0	0
Goodwill	0	0
Insurance reserves
Claim and claim adjustment expenses	3,358	3,220
Unearned premiums	132	120
Future policy benefits	10,326	10,152
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Reinsurance receivables	2,479	2,487
Insurance receivables	2	2
Deferred acquisition costs	0	0
Goodwill	0	0
Insurance reserves
Claim and claim adjustment expenses	2,614	2,644
Unearned premiums	0	0
Future policy benefits	0	0
Eliminations [Member]
Segment Reporting Information [Line Items]
Reinsurance receivables	0	0
Insurance receivables	0	0
Deferred acquisition costs	0	0
Goodwill	0	0
Insurance reserves
Claim and claim adjustment expenses	0	0
Unearned premiums	0	0
Future policy benefits	$ 0	$ 0

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Business Segments (Revenues by Line of Business) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues	$ 2,390	$ 2,433	$ 2,348	$ 2,195	$ 2,269	$ 2,153	$ 2,327	$ 2,352	$ 9,366	$ 9,101	$ 9,692
Specialty [Domain]
Revenues									3,662	3,579	3,708
Management & Professional Liability [Member]
Revenues									2,620	2,617	2,818
Surety [Member]
Revenues									532	502	509
Warranty & Alternative Risks [Member]
Revenues									510	460	381
Commercial [Domain]
Revenues									3,478	3,371	3,683
Middle Markets [Member]
Revenues									1,769	1,623	1,631
Small Business [Member]
Revenues									583	616	709
Other Commercial Insurance [Member]
Revenues									1,126	1,132	1,343
International [Domain]
Revenues									875	856	973
Canada [Member]
Revenues									203	214	273
CNA Europe [Member]
Revenues									319	309	335
Hardy [Member]
Revenues									353	333	365
Life and Group Non-Core [Member]
Revenues									1,326	1,258	1,279
Corporate and Other [Member]
Revenues									26	42	56
Eliminations [Member]
Revenues									$ (1)	$ (5)	$ (7)

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Discontinued Operations Income Statement Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues
Net Earned Premium			$ 0
Net Investment Income			94
Net Realized Investment Gains (Losses)			3
Other Revenues			0
Total Revenues			97
Claims, Benefits and Expenses
Insurance Claims and Policyholders' Benefits			75
Other Operating Expenses			2
Total Claims, Benefits and Expenses			77
Income before Income Tax			20
Income tax (expense) benefit			(6)
Income from operations of discontinued operations, net of income tax			14
Loss on sale, net of income tax (expense) benefit of $40, - and -			(211)
Income tax benefit (expense) on impairment			40
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	$ 0	$ 0	$ (197)

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Discontinued Operations (Narrative) (Details) $ in Millions	Aug. 01, 2014 USD ($)
Discontinued Operations and Disposal Groups [Abstract]
Disposal Group, Including Discontinued Operation, Assets	$ 3,550
Disposal Group, Including Discontinued Operation, Liabilities	$ 3,297

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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended											12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016		Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015		Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Quarterly Financial Data [Abstract]
Revenues	$ 2,390	$ 2,433	$ 2,348	$ 2,195		$ 2,269		$ 2,153	$ 2,327		$ 2,352	$ 9,366		$ 9,101		$ 9,692
Net income (loss)	$ 241	$ 343	$ 209	$ 66	[1]	$ (70)	[2]	$ 178	$ 138	[1]	$ 233	$ 859	[1]	$ 479	[1],[2]	$ 691
Basic earnings (loss) per share	$ 0.89	$ 1.27	$ 0.77	$ 0.25		$ (0.26)		$ 0.66	$ 0.51		$ 0.86	$ 3.18		$ 1.77		$ 2.56
Diluted earnings (loss) per share	$ 0.89	$ 1.26	$ 0.77	$ 0.24		$ (0.26)		$ 0.66	$ 0.51		$ 0.86	$ 3.17		$ 1.77		$ 2.55

[1] Net income (loss) in the first quarter of 2016 and the second quarter of 2015 included a charge related to the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer in our Corporate & Other Non-Core segment.

[2] Net income (loss) in the fourth quarter of 2015 included a charge related to recognition of a premium deficiency in our long term care business.

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Related Party Transactions Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Due to Related Parties	$ 50	$ 82
Fees and expenses of investment facilities and services [Member]
Amounts reimbursed to Loews for services provided to the Company	43	39	$ 39
Due to Related Parties	23	21
Corporate Services and Related Travel Expenses [Member]
Amounts reimbursed to Loews for services provided to the Company	1
Taxes paid [Member]
Due to Related Parties	28	61
Loews [Member]
Amounts earned from Loews for insurance premiums	$ 2	$ 2	$ 2

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Organization Review Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Restructuring and Related Activities [Abstract]
Restructuring Costs	$ 19

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Organization Review Costs by Reportable Segment (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	$ 19
Specialty [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	4
Commercial [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	14
International [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	0
Life and Group Non-Core [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	1
Corporate and Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	$ 0

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Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended											12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016		Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015		Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Revenues
Net realized investment gains (losses)												$ 50		$ (67)		$ 57
Total revenues	$ 2,390	$ 2,433	$ 2,348	$ 2,195		$ 2,269		$ 2,153	$ 2,327		$ 2,352	9,366		9,101		9,692
Claims, Benefits and Expenses
Interest												159		155		183
Income tax expense (benefit)												(278)		(70)		(319)
Net income (loss)	$ 241	$ 343	$ 209	$ 66	[1]	$ (70)	[2]	$ 178	$ 138	[1]	$ 233	859	[1]	479	[1],[2]	691
Total comprehensive income (loss)												1,001		(236)		649
Parent Company [Member]
Revenues
Net investment income												3		1		1
Net realized investment gains (losses)												(7)		5		4
Total revenues												(4)		6		5
Claims, Benefits and Expenses
Administrative and general												1		1		5
Interest												155		154		182
Total expenses												156		155		187
Income (loss) from operations before income taxes and equity in net income of subsidiaries												(160)		(149)		(182)
Income tax expense (benefit)												41		34		35
Income (loss) before equity in net income (loss) of subsidiaries												(119)		(115)		(147)
Equity in net income of subsidiaries												978		594		838
Net income (loss)												859		479		691
Equity in other comprehensive income of subsidiaries												142		(715)		(42)
Total comprehensive income (loss)												$ 1,001		$ (236)		$ 649

[1] Net income (loss) in the first quarter of 2016 and the second quarter of 2015 included a charge related to the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer in our Corporate & Other Non-Core segment.

[2] Net income (loss) in the fourth quarter of 2015 included a charge related to recognition of a premium deficiency in our long term care business.

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Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Balance Sheets) (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash	$ 271	$ 387	$ 190	$ 195
Short term investments	1,407	1,660
Other assets	1,078	1,295
Total assets	55,233	55,045
Liabilities
Short term debt	0	350
Long term debt	2,710	2,210
Other liabilities	4,123	4,243
Total liabilities	43,264	43,289
Stockholders' Equity
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,495,998 and 270,274,361 shares outstanding)	683	683	683	683
Additional paid-in capital	2,173	2,153	2,151	2,145
Retained earnings	9,359	9,313	9,645	9,495
Accumulated other comprehensive income (loss)	(173)	(315)	400	442
Treasury stock (2,544,245 and 2,765,882 shares), at cost	(73)	(78)	(84)	(91)
Total stockholders’ equity	11,969	11,756	12,794
Total liabilities and stockholders' equity	$ 55,233	$ 55,045
Balance Sheet Parenthetical
Common stock, par value	$ 2.50	$ 2.50
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	273,040,243	273,040,243
Common stock, shares outstanding	270,495,998	270,274,361
Treasury stock, shares	2,544,245	2,765,882
Parent Company [Member]
Assets
Investment in subsidiaries	$ 14,202	$ 13,851
Cash	1	4	$ 1	$ 1
Short term investments	487	478
Due from Affiliates	6	0
Other assets	1	1
Total assets	14,697	14,334
Liabilities
Short term debt	0	350
Long term debt	2,680	2,180
Other liabilities	48	48
Total liabilities	2,728	2,578
Stockholders' Equity
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,495,998 and 270,274,361 shares outstanding)	683	683
Additional paid-in capital	2,173	2,153
Retained earnings	9,359	9,313
Accumulated other comprehensive income (loss)	(173)	(315)
Treasury stock (2,544,245 and 2,765,882 shares), at cost	(73)	(78)
Total stockholders’ equity	11,969	11,756
Total liabilities and stockholders' equity	$ 14,697	$ 14,334
Balance Sheet Parenthetical
Common stock, par value	$ 2.50	$ 2.50
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	273,040,243	273,040,243
Common stock, shares outstanding	270,495,998	270,274,361
Treasury stock, shares	2,544,245	2,765,882

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Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Statements of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended											12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016		Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015	[1]	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Cash Flows from Operating Activities
Net income (loss)	$ 241	$ 343	$ 209	$ 66	[1]	$ (70)	[2]	$ 178	$ 138		$ 233	$ 859	[1]	$ 479	[1],[2]	$ 691
Adjustments to reconcile net income (loss) to net cash flows provided (used) by operating activities:
Net realized investment (gains) losses												(50)		67		(57)
Other, net												29		(2)		54
Total adjustments												557		908		749
Net cash flows provided (used) by operating activities												1,416		1,387		1,440
Cash Flows from Investing Activities
Change in short term investments												258		34		(388)
Other, net												2		21		16
Net cash flows provided (used) by investing activities												(846)		(372)		(918)
Cash Flows from Financing Activities
Dividends paid to common stockholders												(813)		(811)		(541)
Proceeds from the issuance of debt												498		0		546
Repayment of debt												(358)		0		(549)
Other, net												0		4		25
Net cash flows provided (used) by financing activities												(673)		(807)		(519)
Net change in cash												(116)		197		(5)
Cash, beginning of year				387							190	387		190		195
Cash, end of year	271					387						271		387		190
Parent Company [Member]
Cash Flows from Operating Activities
Net income (loss)												859		479		691
Adjustments to reconcile net income (loss) to net cash flows provided (used) by operating activities:
Equity in net income (loss) of subsidiaries												(978)		(594)		(838)
Dividends received from subsidiaries												765		900		650
Net realized investment (gains) losses												7		(5)		(4)
Other, net												21		4		14
Total adjustments												(185)		305		(178)
Net cash flows provided (used) by operating activities												674		784		513
Cash Flows from Investing Activities
Change in short term investments												(9)		21		6
Capital contributions to subsidiaries												0		0		(10)
Other, net												4		7		5
Net cash flows provided (used) by investing activities												(5)		28		1
Cash Flows from Financing Activities
Dividends paid to common stockholders												(813)		(811)		(541)
Proceeds from the issuance of debt												498		0		546
Repayment of debt												(358)		0		(549)
Stock options exercised												0		1		5
Other, net												1		1		25
Net cash flows provided (used) by financing activities												(672)		(809)		(514)
Net change in cash												(3)		3		0
Cash, beginning of year				$ 4							$ 1	4		1		1
Cash, end of year	$ 1					$ 4						$ 1		$ 4		$ 1

[1] Net income (loss) in the first quarter of 2016 and the second quarter of 2015 included a charge related to the application of retroactive reinsurance accounting to adverse reserve development ceded under the 2010 A&EP Loss Portfolio Transfer in our Corporate & Other Non-Core segment.

[2] Net income (loss) in the fourth quarter of 2015 included a charge related to recognition of a premium deficiency in our long term care business.

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Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule II. Condensed Financial Information of Registrant (Narrative)) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Cumulative Effect of New Accounting Principle in Period of Adoption on Other Assets		$ (2)
Cumulative Effect of New Accounting Principle in Period of Adoption on Long Term Debt		(2)
Parent Company [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption on Other Assets		(2)
Cumulative Effect of New Accounting Principle in Period of Adoption on Long Term Debt		(2)
Guarantor Obligations, Current Carrying Value	$ 5	$ 5
Guarantor Obligations, Maximum Exposure, Undiscounted	1,900
Indemnification Agreement [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	258
Indemnification Agreement [Member] | Parent Company [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 625

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Schedule V. Valuation and Qualifying Accounts (Schedule of valuation and qualifying accounts) (Details) - Allowance for doubtful accounts, insurance and reinsurance receivables [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in valuation allowances and reserves [Roll Forward]
Balance at beginning of period		$ 89	$ 109	$ 155
Charged to costs and expenses		(2)	(12)	(40)
Charged to other accounts	[1]	(1)	0	(1)
Deductions		(3)	(8)	(5)
Balance at end of period		$ 83	$ 89	$ 109

[1] Amount includes effects of foreign currency translation.

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Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Incurred claim and claim adjustment expenses related to current year	$ 5,025	$ 4,934	$ 5,043
Incurred claim and claim adjustment expenses related to prior years	(342)	(255)	(36)
Consolidated Property and Casualty Insurance Entity [Member]
Deferred acquisition costs	599	597
Reserves for unpaid claim and claim adjustment expenses	22,343	22,663
Discount deducted from claim and claim adjustment expense reserves above (based on interest rates ranging from 3.5% to 8.0%)	1,572	1,534
Unearned Premiums	3,762	3,671
Net written premiums	6,988	6,962	7,088
Net earned premiums	6,924	6,921	7,212
Net investment income	1,952	1,807	2,031
Incurred claim and claim adjustment expenses related to current year	5,025	4,934	5,043
Incurred claim and claim adjustment expenses related to prior years	(342)	(255)	(39)
Amortization of deferred acquisition costs	1,235	1,540	1,317
Paid claim and claim adjustment expenses	$ 5,134	$ 4,945	$ 5,297
Consolidated Property and Casualty Insurance Entity [Member] | Minimum [Member]
Supplemental Information Parenthetical
Supplemental Information for Property, Casualty Insurance Underwriters, Interest Rate at which Discount Computed	3.50%	3.50%
Consolidated Property and Casualty Insurance Entity [Member] | Maximum [Member]
Supplemental Information Parenthetical
Supplemental Information for Property, Casualty Insurance Underwriters, Interest Rate at which Discount Computed	8.00%	8.00%