10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

[ X ]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2018

or

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

For the transition period from to

Commission File Number: 001-07434

Aflac Incorporated

_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

(Exact name of registrant as specified in its charter)

Georgia	58-1167100
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1932 Wynnton Road, Columbus, Georgia	31999
(Address of principal executive offices)	(ZIP Code)

706.323.3431

(Registrant's telephone number, including area code)

(Former name, former address and former fiscal year, if changed since last report)

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.  þ  Yes  ¨  No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, 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).            þ  Yes  ¨  No

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

Large accelerated filer  þ	Accelerated filer ¨
Non-accelerated filer    ¨ (Do not check if a smaller reporting company)	Smaller reporting company  ¨
	Emerging growth company  ¨

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

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

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Class	April 25, 2018
Common Stock, $.10 Par Value	774,167,054

Aflac Incorporated and Subsidiaries

Quarterly Report on Form 10-Q

For the Quarter Ended March 31, 2018

Table of Contents

		Page
PART I.	FINANCIAL INFORMATION:
Item 1.	Financial Statements (Unaudited)
	Review by Independent Registered Public Accounting Firm	1
	Report of Independent Registered Public Accounting Firm	2
	Consolidated Statements of Earnings   Three Months Ended March 31, 2018 and 2017	3
	Consolidated Statements of Comprehensive Income (Loss)   Three Months Ended March 31, 2018 and 2017	4
	Consolidated Balance Sheets   March 31, 2018, and December 31, 2017	5
	Consolidated Statements of Shareholders' Equity   Three Months Ended March 31, 2018 and 2017	7
	Consolidated Statements of Cash Flows   Three Months Ended March 31, 2018 and 2017	8
	Notes to the Consolidated Financial Statements	9
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	62
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	89
Item 4.	Controls and Procedures	89
PART II.	OTHER INFORMATION:	90
Item 1.	Legal Proceedings	90
Item 1A.	Risk Factors	90
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	92
Item 6.	Exhibits	93

Items other than those listed above are omitted because they are not required or are not applicable.

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements.

Review by Independent Registered Public Accounting Firm

The March 31, 2018, and 2017, consolidated financial statements included in this filing have been reviewed by KPMG LLP, an independent registered public accounting firm, in accordance with established professional standards and procedures for such a review.

The report of KPMG LLP commenting upon its review is included on the following page.

1

Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Directors

Aflac Incorporated:

Results of Review of Interim Financial Information

We have reviewed the consolidated balance sheet of Aflac Incorporated and subsidiaries (the Company) as of March 31, 2018, the related consolidated statements of earnings, comprehensive income (loss), shareholders' equity, and cash flows for the three-month periods ended March 31, 2018 and 2017, and the related notes (collectively, the consolidated interim financial information). Based on our reviews, we are not aware of any material modifications that should be made to the consolidated interim financial information for it to be in conformity with U.S. generally accepted accounting principles.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheet of the Company as of December 31, 2017, and the related consolidated statements of earnings, comprehensive income (loss), shareholders’ equity, and cash flows for the year then ended (not presented herein); and in our report dated February 22, 2018, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying consolidated balance sheet as of December 31, 2017, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

Basis for Review Results

This consolidated interim financial information is the responsibility of the Company’s management. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our reviews in accordance with the standards of the PCAOB. A review of consolidated interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the PCAOB, the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

/s/ KPMG LLP

Atlanta, Georgia

May 3, 2018

2

Aflac Incorporated and Subsidiaries

Consolidated Statements of Earnings

	Three Months Ended March 31,
(In millions, except for share and per-share amounts - Unaudited)	2018				2017
Revenues:
Net premiums, principally supplemental health insurance		$	4,745			$	4,638
Net investment income		837				794
Realized investment gains (losses):
Other-than-temporary impairment losses realized		(7		)		(10		)
Other gains (losses) (1)		(127		)		(130		)
Total realized investment gains (losses)		(134		)		(140		)
Other income (loss)		16				17
Total revenues		5,464				5,309
Benefits and expenses:
Benefits and claims, net		3,042				3,052
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs		314				294
Insurance commissions		337				328
Insurance and other expenses		733				675
Interest expense		56				62
Total acquisition and operating expenses		1,440				1,359
Total benefits and expenses		4,482				4,411
Earnings before income taxes		982				898
Income taxes		265				306
Net earnings		$	717			$	592
Net earnings per share:
Basic		$	.92			$	.74
Diluted		.91				.73
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic		778,550				802,259
Diluted		783,852				808,138
Cash dividends per share		$	.26			$	.22

⁽¹⁾ See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

See the accompanying Notes to the Consolidated Financial Statements.

3

Aflac Incorporated and Subsidiaries

Consolidated Statements of Comprehensive Income (Loss)

	Three Months Ended March 31,
(In millions - Unaudited)	2018				2017
Net earnings		$	717			$	592
Other comprehensive income (loss) before income taxes:
Unrealized foreign currency translation gains (losses) during period		824				375
Unrealized gains (losses) on fixed maturity securities: (1)
Unrealized holding gains (losses) on fixed maturity securities during period		(1,931		)		(526		)
Reclassification adjustment for realized (gains) losses on fixed maturity securities included in net earnings		(2		)		16
Unrealized gains (losses) on derivatives during period		6				2
Pension liability adjustment during period		(3		)		(2		)
Total other comprehensive income (loss) before income taxes		(1,106		)		(135		)
Income tax expense (benefit) related to items of other comprehensive income (loss)		(763		)		(137		)
Other comprehensive income (loss), net of income taxes		(343		)		2
Total comprehensive income (loss)		$	374			$	594

⁽¹⁾ See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

See the accompanying Notes to the Consolidated Financial Statements.

4

Aflac Incorporated and Subsidiaries

Consolidated Balance Sheets

(In millions)	March 31, 2018 (Unaudited)			December 31, 2017
Assets:
Investments and cash:
Securities available for sale, at fair value:
Fixed maturity securities (amortized cost $76,912 in 2018 and $70,594 in 2017) (1)		$	83,602		$	78,804
Fixed maturity securities - consolidated variable interest entities (amortized cost $4,695 in 2018 and $4,538 in 2017) (1)		5,431			5,509
Securities held to maturity, at amortized cost:
Fixed maturity securities (fair value $40,468 in 2018 and $38,072 in 2017)		33,377			31,430
Equity securities, at fair value:
Equity securities (1)		348			270
Equity securities - consolidated variable interest entities		760			753
Other investments (2)		5,073			3,402
Cash and cash equivalents		4,080			3,491
Total investments and cash		132,671			123,659
Receivables		906			827
Accrued investment income		745			769
Deferred policy acquisition costs		9,933			9,505
Property and equipment, at cost less accumulated depreciation		448			434
Other (3)		2,653			2,023
Total assets		$	147,356		$	137,217

⁽¹⁾ Includes perpetual securities, see Notes 1 and 3 of the Notes to the Consolidated Financial Statements

⁽²⁾ Includes $3,994 in 2018 and $2,341 in 2017 of loan receivables and limited partnerships from consolidated variable interest entities

⁽³⁾ Includes $241 in 2018 and $151 in 2017 of derivatives from consolidated variable interest entities

See the accompanying Notes to the Consolidated Financial Statements.

(continued)

5

Aflac Incorporated and Subsidiaries

Consolidated Balance Sheets (continued)

(In millions, except for share and per-share amounts)	March 31, 2018 (Unaudited)				December 31, 2017
Liabilities and shareholders’ equity:
Liabilities:
Policy liabilities:
Future policy benefits		$	87,268			$	81,857
Unpaid policy claims		4,630				4,392
Unearned premiums		6,084				5,959
Other policyholders’ funds		7,417				6,939
Total policy liabilities		105,399				99,147
Income taxes		4,407				4,745
Payables for return of cash collateral on loaned securities		5,368				606
Notes payable		5,372				5,289
Other (4)		2,523				2,832
Total liabilities		123,069				112,619
Commitments and contingent liabilities (Note 13)
Shareholders’ equity:
Common stock of $.10 par value. In thousands: authorized 3,800,000 shares in 2018 and 2017; issued 1,346,776 shares in 2018 and 1,345,762 shares in 2017		135				135
Additional paid-in capital		2,089				2,052
Retained earnings		30,183				29,895
Accumulated other comprehensive income (loss):
Unrealized foreign currency translation gains (losses)		(1,303		)		(1,750		)
Unrealized gains (losses) on fixed maturity securities (5)		5,206				5,964
Unrealized gains (losses) on derivatives		(21		)		(23		)
Pension liability adjustment		(197		)		(163		)
Treasury stock, at average cost		(11,805		)		(11,512		)
Total shareholders’ equity		24,287				24,598
Total liabilities and shareholders’ equity		$	147,356			$	137,217

⁽⁴⁾ Includes $86 in 2018 and $128 in 2017 of derivatives from consolidated variable interest entities

⁽⁵⁾ See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

See the accompanying Notes to the Consolidated Financial Statements.

6

Aflac Incorporated and Subsidiaries

Consolidated Statements of Shareholders’ Equity

	Three Months Ended March 31,
(In millions - Unaudited)		2018			2017
Common stock:
Balance, beginning of period		$	135		$	135
Balance, end of period		135			135
Additional paid-in capital:
Balance, beginning of period		2,052			1,908
Exercise of stock options		14			10
Share-based compensation		10			12
Gain (loss) on treasury stock reissued		13			10
Balance, end of period		2,089			1,940
Retained earnings:
Balance, beginning of period		29,895			25,981
Cumulative effect of change in accounting principle - financial instruments, net of income taxes (1)		148			0
Cumulative effect of change in accounting principle - tax effects from tax reform (1)		(374		)	0
Net earnings		717			592
Dividends to shareholders		(203		)	(173		)
Balance, end of period		30,183			26,400
Accumulated other comprehensive income (loss):
Balance, beginning of period		4,028			2,630
Cumulative effect of change in accounting principle - financial instruments, net of income taxes (1)		(148		)	0
Cumulative effect of change in accounting principle - tax effects from tax reform (1)		374			0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		447			333
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments (1)		(984		)	(331		)
Unrealized gains (losses) on derivatives during period, net of income taxes		2			2
Pension liability adjustment during period, net of income taxes		(34		)	(2		)
Balance, end of period		3,685			2,632
Treasury stock:
Balance, beginning of period		(11,512		)	(10,172		)
Purchases of treasury stock		(309		)	(610		)
Cost of shares issued		16			15
Balance, end of period		(11,805		)	(10,767		)
Total shareholders’ equity		$	24,287		$	20,340

⁽¹⁾ See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018.

See the accompanying Notes to the Consolidated Financial Statements.

7

Aflac Incorporated and Subsidiaries

Consolidated Statements of Cash Flows

	Three Months Ended March 31,
(In millions - Unaudited)	2018				2017
Cash flows from operating activities:
Net earnings		$	717			$	592
Adjustments to reconcile net earnings to net cash provided by operating activities:
Change in receivables and advance premiums		14				106
Capitalization of deferred policy acquisition costs		(349		)		(335		)
Amortization of deferred policy acquisition costs		314				294
Increase in policy liabilities		572				666
Change in income tax liabilities		(131		)		271
Realized investment (gains) losses		134				140
Other, net		(33		)		23
Net cash provided (used) by operating activities		1,238				1,757
Cash flows from investing activities:
Proceeds from investments sold or matured:
Securities available for sale:
Fixed maturity securities sold		433				1,385
Fixed maturity securities matured or called		510				204
Equity securities sold		157				155
Securities held to maturity:
Fixed maturity securities matured or called		50				228
Other investments - loan receivables		146				34
Costs of investments acquired:
Available-for-sale fixed maturity securities		(3,975		)		(3,726		)
Equity securities		(166		)		(157		)
Other investments - loan receivables		(1,772		)		(123		)
Other investments, excluding loan receivables, net		(125		)		(114		)
Settlement of derivatives, net		(1		)		(44		)
Cash received (pledged or returned) as collateral, net		4,578				654
Other, net		(34		)		(23		)
Net cash provided (used) by investing activities		(199		)		(1,527		)
Cash flows from financing activities:
Purchases of treasury stock		(296		)		(610		)
Proceeds from borrowings		2				524
Principal payments under debt obligations		0				(654		)
Dividends paid to shareholders		(195		)		(166		)
Change in investment-type contracts, net		7				18
Treasury stock reissued		14				11
Other, net		(5		)		1
Net cash provided (used) by financing activities		(473		)		(876		)
Effect of exchange rate changes on cash and cash equivalents		23				(8		)
Net change in cash and cash equivalents		589				(654		)
Cash and cash equivalents, beginning of period		3,491				4,859
Cash and cash equivalents, end of period		$	4,080			$	4,205
Supplemental disclosures of cash flow information:
Income taxes paid		$	396			$	58
Interest paid		36				47
Noncash interest		21				15
Impairment losses included in realized investment losses		7				10
Noncash financing activities:
Capital lease obligations		1				2
Treasury stock issued for:
Associate stock bonus		5				6
Shareholder dividend reinvestment		8				7
Share-based compensation grants		2				1

See the accompanying Notes to the Consolidated Financial Statements.

8

Aflac Incorporated and Subsidiaries

Notes to the Consolidated Financial Statements

(Interim period data – Unaudited)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Description of Business

Aflac Incorporated (the Parent Company) and its subsidiaries (collectively, the Company) primarily sell supplemental health and life insurance in the United States and Japan. The Company's insurance business is marketed and administered through American Family Life Assurance Company of Columbus (Aflac) in the United States (Aflac U.S.) and as a branch in Japan (Aflac Japan). The conversion of Aflac Japan from a branch to a legal subsidiary was completed on April 1, 2018 (see Note 14), after which date the Company's insurance business is marketed and administered through American Family Life Assurance Company of Columbus (Aflac) in the United States (Aflac U.S.) and through Aflac Life Insurance Japan Ltd. in Japan (Aflac Japan). American Family Life Assurance Company of New York (Aflac New York) is a wholly owned subsidiary of Aflac. Most of Aflac's policies are individually underwritten and marketed through independent agents. Additionally, Aflac U.S. markets and administers group products through Continental American Insurance Company (CAIC), branded as Aflac Group Insurance. The Company's insurance operations in the United States and Japan service the two markets for the Company's insurance business. Aflac Japan's revenues, including realized gains and losses on its investment portfolio, accounted for 71% and 69% of the Company's total revenues in the three-month periods ended March 31, 2018 and 2017, respectively. The percentage of the Company's total assets attributable to Aflac Japan was 85% at March 31, 2018, compared with 83% at December 31, 2017.

Basis of Presentation

The Company prepares its financial statements in accordance with U.S. generally accepted accounting principles (GAAP). These principles are established primarily by the Financial Accounting Standards Board (FASB). In these Notes to the Consolidated Financial Statements, references to U.S. GAAP issued by the FASB are derived from the FASB Accounting Standards Codification^TM (ASC). The preparation of financial statements in conformity with U.S. GAAP requires the Company to make estimates based on currently available information when recording transactions resulting from business operations. The most significant items on the Company's balance sheet that involve a greater degree of accounting estimates and actuarial determinations subject to changes in the future are the valuation of investments and derivatives, deferred policy acquisition costs (DAC), liabilities for future policy benefits and unpaid policy claims, and income taxes. These accounting estimates and actuarial determinations are sensitive to market conditions, investment yields, mortality, morbidity, commission and other acquisition expenses, and terminations by policyholders. As additional information becomes available, or actual amounts are determinable, the recorded estimates will be revised and reflected in operating results. Although some variability is inherent in these estimates, the Company believes the amounts provided are adequate.

The unaudited consolidated financial statements include the accounts of the Parent Company, its subsidiaries and those entities required to be consolidated under applicable accounting standards. All material intercompany accounts and transactions have been eliminated.

In the opinion of management, the accompanying unaudited consolidated financial statements of the Company contain all adjustments, consisting of normal recurring accruals, which are necessary to fairly present the consolidated balance sheets as of March 31, 2018, and December 31, 2017, the consolidated statements of earnings and comprehensive income (loss), shareholders' equity and cash flows for the three-month periods ended March 31, 2018 and 2017. Results of operations for interim periods are not necessarily indicative of results for the entire year. As a result, these financial statements should be read in conjunction with the financial statements and notes thereto included in the Company's annual report on Form 10-K for the year ended December 31, 2017 (2017 Annual Report).

Stock split: On February 13, 2018, the Board of Directors of the Parent Company declared a two-for-one stock split of the Company’s common stock in the form of a 100% stock dividend payable on March 16, 2018 to shareholders of record at the close of business on March 2, 2018. The stock split was payable in the form of one additional common stock share for every share of common stock held. All equity and share-based data, including the number of shares outstanding and per share amounts, have been adjusted to reflect the stock split for all periods presented in this Quarterly Report on Form 10-Q.

Reclassifications: Certain reclassifications have been made to prior-year amounts to conform to current-year reporting classifications. These reclassifications had no impact on net earnings or total shareholders' equity.

9

Perpetual securities have been reclassified in prior periods from a separate line item to fixed maturity securities to conform to current period reporting classifications. This reclassification had no impact on net earnings or total shareholder’s equity.

New Accounting Pronouncements

Recently Adopted Accounting Pronouncements

Technical Corrections and Improvements to Financial Instruments - Overall: In February 2018, the FASB issued amendments to clarify certain aspects of the guidance issued in the original Financial Instruments - Overall - Recognition and Measurement pronouncement summarized below. Specifically, for entities who have chosen the measurement alternative approach for equity securities without readily determinable fair values, the amendments clarify that entities may change from a measurement alternative approach to a fair value method through an irrevocable election that would apply to a specific equity security and all identical or similar investments of the same issuer; entities should use an observable price at the date of the transaction rather than reporting date for the measurement alternative calculation; and insurance companies should use a prospective transition method when applying the measurement alternative. The amendments are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years beginning after June 15, 2018. All entities may early adopt these amendments for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, as long as they have adopted the Financial Instruments - Overall - Recognition and Measurement guidance discussed below. The Company elected to early adopt this technical correction and improvement guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company’s financial position, results of operations, or disclosures.

Income Statement - Reporting Comprehensive Income - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income: In February 2018, the FASB issued amendments which allow a reclassification from accumulated other comprehensive income (AOCI) to retained earnings of the effects of the change in the U.S. federal income tax rate resulting from the Tax Cuts and Jobs Act (Tax Act) on the gross deferred tax amounts and the corresponding valuation allowances related to items remaining in AOCI. The amendments eliminate the stranded tax effects resulting from the Tax Act and also require certain disclosures about the reclassified tax effects. The amendments are effective for all entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Public business entities may early adopt this guidance in any interim reporting period for which financial statements have not yet been issued. The amendments should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Act is recognized. The Company elected to early adopt this guidance as of January 1, 2018. The amounts reclassified from AOCI to retained earnings include the income tax effects of the change in the federal corporate tax rate enacted by the Tax Act. The Company’s policy is to follow the portfolio approach for releasing income tax effects from AOCI. The adoption of this guidance resulted in an increase to beginning 2018 AOCI of $374 million with a corresponding decrease to beginning 2018 retained earnings as of January 1, 2018.

Compensation - Stock Compensation - Scope of Modification Accounting: In May 2017, the FASB issued amendments to provide guidance clarifying when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. An entity should apply modification accounting if the fair value, vesting conditions or classification of the award (as an equity instrument or liability instrument) changes as a result of the change in terms or conditions of the award. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Compensation - Retirement Benefit - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost: In March 2017, the FASB issued amendments requiring that an employer report the service cost component of net periodic pension cost and net periodic postretirement benefit cost in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net periodic pension cost and net periodic postretirement benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. If a separate line item or items are used to present the other components of net benefit cost, that line item or items must be appropriately described. If a separate line item or items are not used, the line item or items used in the income statement to present the other components of net benefit cost must be disclosed. The amendments in this update also allow only the service cost component to be eligible for capitalization when applicable. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

10

Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets - Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets: In February 2017, the FASB issued amendments that clarify the scope and accounting guidance for the derecognition of a nonfinancial asset or a financial asset that meets the definition of an "in substance nonfinancial asset." The amendments define an "in substance nonfinancial asset" and provide additional accounting guidance for partial sales of nonfinancial assets. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

Business Combinations - Clarifying the Definition of a Business: In January 2017, the FASB issued amendments clarifying when a set of assets and activities is a business. The amendments provide a screen to exclude transactions where substantially all the fair value of the transferred set is concentrated in a single asset, or group of similar assets, from being evaluated as a business. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Statement of Cash Flows - Restricted Cash: In November 2016, the FASB issued amendments requiring that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory: In October 2016, the FASB issued amendments that require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments: In August 2016, the FASB issued amendments that provide guidance on eight specific statement of cash flows classification issues. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

Financial Instruments - Overall - Recognition and Measurement of Financial Assets and Financial Liabilities: In January 2016, the FASB issued guidance to address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The main provisions of this guidance require certain equity investments to be measured at fair value with changes in fair value recognized in net earnings; separate presentation in other comprehensive income for changes in fair value of financial liabilities measured under the fair value option that are due to instrument-specific credit risk; and changes in disclosures associated with the fair value of financial instruments. The guidance also clarifies that entities should evaluate the need for a valuation allowance on a deferred tax asset (DTA) related to available-for-sale (AFS) securities in combination with the entity's other DTAs. The Company adopted this guidance as of January 1, 2018. The Company recorded a cumulative effect adjustment with an increase to beginning 2018 retained earnings and a decrease to beginning 2018 AOCI of $148 million, net of taxes.

Revenue from Contracts with Customers: In May 2014, the FASB issued updated guidance that affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (e.g., insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Accounting Pronouncements Pending Adoption

Leases - Land Easement Practical Expedient for Transition to Topic 842: In January 2018, FASB issued guidance which provides an entity with the option to elect a transition practical expedient to not evaluate, under Topic 842, land easements that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. The amendments clarify that new or modified land easements should be evaluated under the new leases standard once an entity has adopted the new standard. The amendments are effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is

11

permitted. The adoption of this guidance is not expected to have a significant impact on the Company's financial position, results of operations, or disclosures.

Derivatives and Hedging - Targeted Improvements to Accounting for Hedging Activities: In August 2017, FASB issued guidance which improves and simplifies the accounting rules around hedge accounting and will create more transparency around how economic results are presented on financial statements. Issues addressed in this new guidance include: 1) risk component hedging, 2) accounting for the hedged item in fair value hedges of interest rate risk, 3) recognition and presentation of the effects of hedging instruments, and 4) amounts excluded from the assessment of hedge effectiveness. The amendments are effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted in any interim period after issuance of the guidance. The adoption of this guidance is not expected to have a significant impact on the Company's financial position, results of operations, or disclosures.

Receivables - Nonrefundable Fees and Other Costs - Premium Amortization on Purchased Callable Debt Securities: In March 2017, the FASB issued amendments to shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount. The amendments are effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The adoption of this guidance is not expected to have a significant impact on the Company's financial position, results of operations, or disclosures.

Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment: In January 2017, the FASB issued amendments simplifying the subsequent measurement of goodwill. An entity, under this update, is no longer required to perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, the entity should perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. The amendments are effective for public business entities that are SEC filers for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for any goodwill impairment tests performed on testing dates after January 1, 2017. The Company does not expect the adoption of this guidance to have a significant impact on its financial position, results of operations, or disclosures.

Financial Instruments - Credit Losses - Measurement of Credit Losses on Financial Instruments: In June 2016, the FASB issued amendments that require a financial asset (or a group of financial assets) measured on an amortized cost basis to be presented net of an allowance for credit losses in order to reflect the amount expected to be collected on the financial asset(s). The measurement of expected credit losses is amended by replacing the incurred loss impairment methodology in current U.S. GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform about a credit loss. Credit losses on available-for-sale debt securities will continue to be measured in a manner similar to current U.S. GAAP; however, the amendments require that credit losses be presented as an allowance rather than as a write-down. Other amendments include changes to the balance sheet presentation and interest income recognition of purchased financial assets with a more-than-insignificant amount of credit deterioration since origination (PCD financial assets).

The amendments are effective for public companies for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Companies may early adopt this guidance as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The amendments will be adopted following a modified-retrospective approach resulting in a cumulative effect adjustment in retained earnings as of the beginning of the year of adoption. Two exceptions to this adoption method are for PCD financial assets and debt securities for which other-than-temporary impairment (OTTI) will have been recognized before the effective date. Loans purchased with credit deterioration accounted for under current U.S. GAAP as "purchased credit impaired" (PCI) financial assets will be classified as PCD financial assets at transition and PCD guidance will be applied prospectively. Debt securities that have experienced OTTI before the effective date will follow a prospective adoption method which allows an entity to maintain the same amortized cost basis before and after the effective date.

The Company has identified certain financial instruments in scope of this guidance to include certain fixed maturity securities, loan and loan receivables and reinsurance recoverables (See Notes 3 and 7 for current balances of instruments in scope). The Company is continuing its progress towards updating its credit loss projection models and accounting systems in order to comply with the required changes in measurement of credit losses. The Company currently expects loans and loan receivables and held-to-maturity fixed maturity securities to be the asset classes most significantly impacted upon adoption of the guidance. The Company continues to evaluate the impact of adoption of this guidance on its financial position, results of operations, and disclosures.

12

Leases: In February 2016, the FASB issued updated guidance for accounting for leases. Per the amendments, lessees will be required to recognize all leases on the balance sheet with the exception of short-term leases. A lease liability will be recorded for the obligation of a lessee to make lease payments arising from a lease. A right-of-use asset will be recorded which represents the lessee’s right to use, or to control the use of, a specified asset for a lease term. Under the new guidance, lessor accounting is largely unchanged. The amendments are effective for public companies for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The Company has identified certain operating leases in scope of this guidance to include office space and equipment leases (See Note 15 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report for current balances of leases in scope). The leases within scope of this guidance will increase the Company's right-of-use assets and lease liabilities recorded on its statement of financial position, however the Company estimates leases within scope of the guidance to represent less than 1% of its total assets as of March 31, 2018. The Company estimates that the adoption of this guidance will not have a significant impact on its financial position, results of operations, or disclosures.

Recent accounting guidance not discussed above is not applicable, did not have, or is not expected to have a material impact to the Company's business. 

For additional information on new accounting pronouncements and recent accounting guidance and their impact, if any, on the Company's financial position or results of operations, see Note 1 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

2. BUSINESS SEGMENT INFORMATION

The Company consists of two reportable insurance business segments: Aflac Japan and Aflac U.S., both of which sell supplemental health and life insurance. Operating business segments that are not individually reportable and business activities, including reinsurance retrocession activities, not included in Aflac Japan or Aflac U.S. are included in the "Corporate and other" category.

The Company does not allocate corporate overhead expenses to business segments. Consistent with U.S. GAAP accounting guidance for segment reporting, the Company evaluates and manages its business segments using a financial performance measure called pretax adjusted earnings. Adjusted earnings are adjusted revenues less benefits and adjusted expenses. The adjustments to both revenues and expenses account for certain items that cannot be predicted or that are outside management’s control. Adjusted revenues are U.S. GAAP total revenues excluding realized investment gains and losses, except for amortized hedge costs related to foreign currency denominated investments. Adjusted expenses are U.S. GAAP total acquisition and operating expenses including the impact of interest cash flows from derivatives associated with notes payable but excluding any nonrecurring or other items not associated with the normal course of the Company’s insurance operations and that do not reflect Aflac’s underlying business performance. The Company excludes income taxes related to operations to arrive at pretax adjusted earnings. Information regarding operations by segment follows:

13

	Three Months Ended March 31,
(In millions)	2018			2017
Revenues:
Aflac Japan:
Net earned premiums	$	3,263		$	3,194
Net investment income, less amortized hedge costs (1)	588			557
Other income	12			10
Total Aflac Japan	3,863			3,761
Aflac U.S.:
Net earned premiums	1,427			1,390
Net investment income	175			178
Other income	2			1
Total Aflac U.S.	1,604			1,569
Corporate and other (2)	79			67
Total adjusted revenues	5,546			5,397
Realized investment gains (losses) (1),(2)	(82		)	(88		)
Total revenues	$	5,464		$	5,309

⁽¹⁾ Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $52 for the three-month periods ended March 31, 2018, and 2017, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from net investment income when analyzing segment operations.

⁽²⁾ Amortized hedge costs in Aflac Japan were offset by derivatives entered into as part of corporate activities and resulted in a benefit of $2 for the three-month period ended March 31, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in net investment income when analyzing operations.

	Three Months Ended March 31,
(In millions)	2018			2017
Pretax earnings:
Aflac Japan (1)	$	818		$	769
Aflac U.S.	337			310
Corporate and other (2)	(46		)	(52		)
Pretax adjusted earnings	1,109			1,027
Realized investment gains (losses) (1),(2),(3)	(98		)	(109		)
Other income (loss)	(29		)	(20		)
Total earnings before income taxes	$	982		$	898
Income taxes applicable to pretax adjusted earnings	$	289		$	351
Effect of foreign currency translation on after-tax adjusted earnings	21			5

⁽¹⁾ Amortizedhedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $52 for the three-month periods ended March 31, 2018, and 2017, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from pretax adjusted earnings when analyzing segment operations.

⁽²⁾ Amortized hedge costs in Aflac Japan were offset by derivatives entered into as part of corporate activities and resulted in a benefit of $2 for the three-month period ended March 31, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in pretax adjusted earnings when analyzing operations.

⁽³⁾ Excluding a gain of $17 and $21 for the three-month periods ended March 31, 2018, and 2017, respectively, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable which is included in adjusted earnings when analyzing segment operations

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Assets were as follows:

(In millions)	March 31, 2018			December 31, 2017
Assets:
Aflac Japan		$	125,174		$	114,402
Aflac U.S.		19,706			19,893
Corporate and other		2,476			2,922
Total assets		$	147,356		$	137,217

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3. INVESTMENTS

Investment Holdings

The amortized cost for the Company's investments in debt securities, the cost for equity securities and the fair values of these investments are shown in the following tables.

	March 31, 2018
(In millions)	Cost or Amortized Cost				Gross Unrealized Gains			Gross Unrealized Losses			Fair   Value
Securities available for sale, carried at fair value through other comprehensive income:
Fixed maturity securities: (1)
Yen-denominated:
Japan government and agencies		$	32,961			$	3,811		$	192		$	36,580
Municipalities		350				33			11			372
Mortgage- and asset-backed securities		254				30			0			284
Public utilities		1,739				325			4			2,060
Sovereign and supranational		1,348				212			27			1,533
Banks/financial institutions		5,157				799			76			5,880
Other corporate		4,345				754			8			5,091
Total yen-denominated		46,154				5,964			318			51,800
U.S. dollar-denominated:
U.S. government and agencies		148				9			1			156
Municipalities		866				135			0			1,001
Mortgage- and asset-backed securities		165				7			1			171
Public utilities		5,223				631			107			5,747
Sovereign and supranational		274				59			0			333
Banks/financial institutions		2,841				457			34			3,264
Other corporate		25,936				1,736			1,111			26,561
Total U.S. dollar-denominated		35,453				3,034			1,254			37,233
Total securities available for sale		$	81,607	(1)		$	8,998		$	1,572		$	89,033	(1)

⁽¹⁾ Includes perpetual securities ($1,506 at amortized cost and $1,774 at fair value)

	March 31, 2018
(In millions)	Cost or Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair   Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Yen-denominated:
Japan government and agencies		$	22,686		$	5,631		$	0		$	28,317
Municipalities		379			114			0			493
Mortgage- and asset-backed securities		26			2			0			28
Public utilities		3,508			383			0			3,891
Sovereign and supranational		1,620			299			0			1,919
Banks/financial institutions		2,300			190			13			2,477
Other corporate		2,858			485			0			3,343
Total yen-denominated		33,377			7,104			13			40,468
Total securities held to maturity		$	33,377		$	7,104		$	13		$	40,468

16

	March 31, 2018
(In millions)		Fair   Value
Equity securities, carried at fair value through   net earnings:
Equity securities: (1)
Yen-denominated			$	711
U.S. dollar-denominated			397
Total equity securities			$	1,108	(1)

⁽¹⁾ Includes perpetual securities ($71 at fair value)

	December 31, 2017
(In millions)	Cost or Amortized Cost				Gross Unrealized Gains			Gross Unrealized Losses			Fair   Value
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Yen-denominated:
Japan government and agencies		$	27,980			$	3,363		$	271		$	31,072
Municipalities		314				28			12			330
Mortgage- and asset-backed securities		242				29			0			271
Public utilities		1,635				352			6			1,981
Sovereign and supranational		1,380				190			1			1,569
Banks/financial institutions		4,742				811			53			5,500
Other corporate		4,085				809			7			4,887
Total yen-denominated		40,378				5,582			350			45,610
U.S dollar-denominated:
U.S. government and agencies		146				13			1			158
Municipalities		872				168			0			1,040
Mortgage- and asset-backed securities		161				12			0			173
Public utilities		5,116				884			27			5,973
Sovereign and supranational		267				73			0			340
Banks/financial institutions		2,808				633			8			3,433
Other corporate		25,384				2,620			418			27,586
Total U.S. dollar-denominated		34,754				4,403			454			38,703
Total securities available for sale		$	75,132	(1)		$	9,985		$	804		$	84,313	(1)

⁽¹⁾ Includes perpetual securities ($1,462 at amortized cost and $1,789 at fair value)

17

	December 31, 2017
(In millions)	Cost or Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Yen-denominated:
Japan government and agencies		$	21,331		$	5,160		$	0		$	26,491
Municipalities		357			105			0			462
Mortgage- and asset-backed securities		26			1			0			27
Public utilities		3,300			398			0			3,698
Sovereign and supranational		1,523			312			0			1,835
Banks/financial institutions		2,206			190			9			2,387
Other corporate		2,687			485			0			3,172
Total yen-denominated		31,430			6,651			9			38,072
Total securities held to maturity		$	31,430		$	6,651		$	9		$	38,072

	December 31, 2017
(In millions)		Fair Value
Equity securities, carried at fair value:
Equity securities:
Yen-denominated			$	695
U.S. dollar-denominated			328
Total equity securities			$	1,023

The methods of determining the fair values of the Company's investments in fixed maturity securities and equity securities are described in Note 5.

During the first quarter of 2018 and 2017, respectively, the Company did not reclassify any investments from the held-to-maturity category to the available-for-sale category.

Contractual and Economic Maturities

The contractual and economic maturities of the Company's investments in fixed maturity securities at March 31, 2018, were as follows:

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(In millions)	Amortized Cost			Fair Value
Available for sale: (1)
Due in one year or less		$	485		$	502
Due after one year through five years		9,685			9,551
Due after five years through 10 years		10,637			11,143
Due after 10 years		60,381			67,382
Mortgage- and asset-backed securities		419			455
Total fixed maturity securities available for sale		$	81,607		$	89,033
Held to maturity:
Due in one year or less		$	1,036		$	1,049
Due after one year through five years		508			527
Due after five years through 10 years		1,597			1,754
Due after 10 years		30,210			37,110
Mortgage- and asset-backed securities		26			28
Total fixed maturity securities held to maturity		$	33,377		$	40,468

⁽¹⁾ Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)

Expected maturities may differ from contractual maturities because some issuers have the right to call or prepay obligations with or without call or prepayment penalties.

Investment Concentrations

The Company's process for investing in credit-related investments begins with an independent approach to underwriting each issuer's fundamental credit quality. The Company evaluates independently those factors that it believes could influence an issuer's ability to make payments under the contractual terms of the Company's instruments. This includes a thorough analysis of a variety of items including the issuer's country of domicile (including political, legal, and financial considerations); the industry in which the issuer competes (with an analysis of industry structure, end-market dynamics, and regulation); company specific issues (such as management, assets, earnings, cash generation, and capital needs); and contractual provisions of the instrument (such as financial covenants and position in the capital structure). The Company further evaluates the investment considering broad business and portfolio management objectives, including asset/liability needs, portfolio diversification, and expected income.

Investment exposures that individually exceeded 10% of shareholders' equity were as follows:

	March 31, 2018			December 31, 2017
(In millions)	Credit Rating	Amortized Cost	Fair Value	Credit Rating	Amortized Cost	Fair Value
Japan National Government(1)	A	$54,465	$63,576	A	$48,399	$56,532

⁽¹⁾Japan Government Bonds (JGBs) or JGB-backed securities

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Realized Investment Gains and Losses

Information regarding pretax realized gains and losses from investments is as follows:

	Three Months Ended March 31,
(In millions)	2018				2017
Realized investment gains (losses):
Fixed maturity securities: (1)
Available for sale:
Gross gains from sales	$	9			$	12
Gross losses from sales	(4		)		(15		)
Net gains (losses) from redemptions	(2		)		(28		)
Other-than-temporary impairment losses	0				(4		)
Total fixed maturity securities	3				(35		)
Equity securities (2)	(46		)	(1)	19			(3)
Loan loss reserves	(7		)		(1		)
Derivatives and other:
Derivative gains (losses)	144				(52		)
Foreign currency gains (losses)	(228		)		(71		)
Total derivatives and other	(84		)		(123		)
Total realized investment gains (losses)	$	(134	)		$	(140	)

⁽¹⁾ Includes perpetual securities

⁽²⁾ See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

⁽³⁾ Includes $6 of impairments

The unrealized holding losses, net of gains, recorded as a component of realized investment gains and losses for the three-month period ended March 31, 2018, that relates to equity securities still held at the March 31, 2018, reporting date was $43 million.

Unrealized Investment Gains and Losses

Effect on Shareholders’ Equity

The net effect on shareholders’ equity of unrealized gains and losses from investment securities was as follows:

(In millions)	March 31, 2018				December 31, 2017
Unrealized gains (losses) on securities available for sale		$	7,426			$	9,358
Deferred income taxes		(2,220		)		(3,394		)
Shareholders’ equity, unrealized gains (losses) on investment securities		$	5,206			$	5,964

See Note 1 for discussion of the accounting treatment of tax on amounts recorded in accumulated other comprehensive income pursuant to the Tax Act and for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

Gross Unrealized Loss Aging

The following tables show the fair values and gross unrealized losses of the Company's available-for-sale and held-to-maturity investments that were in an unrealized loss position, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.

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	March 31, 2018
	Total						Less than 12 months						12 months or longer
(In millions)	Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value			Unrealized Losses
Fixed maturity securities: (1)
U.S. government and agencies:
U.S. dollar-denominated		$	79		$	1		$	71		$	1		$	8		$	0
Japan government and agencies:
Yen-denominated		4,054			192			128			0			3,926			192
Municipalities:
Yen-denominated		128			11			0			0			128			11
Mortgage- and asset- backed securities:
U.S. dollar-denominated		91			1			71			1			20			0
Public utilities:
U.S. dollar-denominated		1,649			107			1,095			52			554			55
Yen-denominated		90			4			0			0			90			4
Sovereign and supranational:
Yen-denominated		302			27			302			27			0			0
Banks/financial institutions:
U.S. dollar-denominated		685			34			596			28			89			6
Yen-denominated		1,467			89			645			14			822			75
Other corporate:
U.S. dollar-denominated		13,730			1,111			8,903			420			4,827			691
Yen-denominated		302			8			276			6			26			2
Total		$	22,577		$	1,585		$	12,087		$	549		$	10,490		$	1,036

⁽¹⁾ Includes perpetual securities

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	December 31, 2017
	Total						Less than 12 months						12 months or longer
(In millions)	Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value			Unrealized Losses
Fixed maturity securities: (1)
U.S. government and agencies:
U.S. dollar-denominated		$	74		$	1		$	74		$	1		$	0		$	0
Japan government and agencies:
Yen-denominated		5,255			271			1,264			9			3,991			262
Municipalities:
Yen-denominated		129			12			10			0			119			12
Public utilities:
U.S. dollar-denominated		785			27			221			3			564			24
Yen-denominated		83			6			0			0			83			6
Sovereign and supranational:
Yen-denominated		309			1			309			1			0			0
Banks/financial institutions:
U.S. dollar-denominated		362			8			316			5			46			3
Yen-denominated		1,507			62			394			4			1,113			58
Other corporate:
U.S. dollar-denominated		7,741			418			2,839			50			4,902			368
Yen-denominated		440			7			349			4			91			3
Total		$	16,685		$	813		$	5,776		$	77		$	10,909		$	736

⁽¹⁾ Includes perpetual securities

Analysis of Securities in Unrealized Loss Positions

The unrealized losses on the Company's fixed maturity securities investments have been primarily related to general market changes in interest rates, foreign exchange rates, and/or the levels of credit spreads rather than specific concerns with the issuer's ability to pay interest and repay principal.

For any significant declines in fair value of its fixed maturity securities, the Company performs a more focused review of the related issuers' credit profile. For corporate issuers, the Company evaluates their assets, business profile including industry dynamics and competitive positioning, financial statements and other available financial data. For non-corporate issuers, the Company analyzes all sources of credit support, including issuer-specific factors. The Company utilizes information available in the public domain and, for certain private placement issuers, from consultations with the issuers directly. The Company also considers ratings from Nationally Recognized Statistical Rating Organizations (NRSROs), as well as the specific characteristics of the security it owns including seniority in the issuer's capital structure, covenant predictions, or other relevant features. From these reviews, the Company evaluates the issuers' continued ability to service the Company's investment through payment of interest and principal.

Assuming no credit-related factors develop, unrealized gains and losses on fixed maturity securities are expected to diminish as investments near maturity. Based on its credit analysis, the Company believes that the issuers of its fixed maturity investments in the sectors shown in the table above have the ability to service their obligations to the Company.

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Other Investments

The table below reflects the composition of the carrying value for other investments as of the periods presented.

(In millions)	March 31, 2018			December 31, 2017
Other investments:
Transitional real estate loans		$	2,719		$	1,235
Commercial mortgage loans		917			908
Middle market loans		957			859
Policy loans		227			210
Short-term investments		0			57
Other		253			133
Total other investments		$	5,073		$	3,402

Loans and Loan Receivables

The Company classifies its transitional real estate loans (TREs), commercial mortgage loans (CMLs) and middle market loans (MMLs) as held-for-investment and includes them in the other investments line on the consolidated balance sheets. The Company carries them on the balance sheet at amortized cost less an estimated allowance for loan losses. The Company's allowance for loan losses is established using both general and specific allowances. The general allowance is used for loans grouped by similar risk characteristics where a loan-specific or market-specific risk has not been identified, but for which the Company estimates probable incurred losses. The specific allowance is used on an individual loan basis when it is probable that a loss has been incurred. As of March 31, 2018, and December 31, 2017, the Company's allowance for loan losses was $18 million and $11 million, respectively. As of March 31, 2018, and December 31, 2017, the Company had no loans that were past due in regards to principal and/or interest payments. Additionally, the Company held no loans that were on nonaccrual status or considered impaired as of March 31, 2018, and December 31, 2017. The Company had no troubled debt restructurings during the three months ended March 31, 2018 and 2017.

Transitional Real Estate Loans

Transitional real estate loans are commercial mortgage loans that are typically relatively short-term floating rate instruments secured by a first lien on the property. These loans provide funding for properties undergoing a change in their physical characteristics and/or economic profile. As of March 31, 2018, the Company had $436 million in outstanding commitments to fund transitional real estate loans. These commitments are contingent on the final underwriting and due diligence to be performed.

Commercial Mortgage Loans

As of March 31, 2018, the Company had $54 million in outstanding commitments to fund commercial mortgage loans. These commitments are contingent on the final underwriting and due diligence to be performed.

Middle Market Loans

Middle market loans are generally considered to be below investment grade. The carrying value for middle market loans included an unfunded amount of $76 million and $109 million, as of March 31, 2018, and December 31, 2017, respectively, that is reflected in other liabilities on the consolidated balance sheets.

As of March 31, 2018, the Company had commitments of approximately $985 million to fund potential future loan originations related to this investment program. These commitments are contingent upon the availability of middle market loans that meet the Company's underwriting criteria.

Other

Other investments primarily includes investments in limited partnerships. As of March 31, 2018, the Company had $763 million in outstanding commitments to fund alternative investments in limited partnerships.

23

Variable Interest Entities (VIEs)

As a condition of its involvement or investment in a VIE, the Company enters into certain protective rights and covenants that preclude changes in the structure of the VIE that would alter the creditworthiness of the Company's investment or its beneficial interest in the VIE.

For those VIEs other than certain unit trust structures, the Company's involvement is passive in nature. The Company has not, nor has it been, required to purchase any securities issued in the future by these VIEs.

The Company's ownership interest in VIEs is limited to holding the obligations issued by them. The Company has no direct or contingent obligations to fund the limited activities of these VIEs, nor does it have any direct or indirect financial guarantees related to the limited activities of these VIEs. The Company has not provided any assistance or any other type of financing support to any of the VIEs it invests in, nor does it have any intention to do so in the future. For those VIEs in which the Company holds debt obligations, the weighted-average lives of the Company's notes are very similar to the underlying collateral held by these VIEs where applicable.

The Company's risk of loss related to its interests in any of its VIEs is limited to the carrying value of the related investments held in the VIE.

VIEs - Consolidated

The following table presents the cost or amortized cost, fair value and balance sheet caption in which the assets and liabilities of consolidated VIEs are reported.

Investments in Consolidated Variable Interest Entities

	March 31, 2018						December 31, 2017
(In millions)	Cost or Amortized Cost			Fair Value			Cost or Amortized Cost			Fair Value
Assets:
Fixed maturity securities, available for sale (1)		$	4,695		$	5,431		$	4,538		$	5,509
Equity securities		760			760			606			753
Other investments (2)		3,994			3,974			2,341			2,328
Other assets (3)		241			241			151			151
Total assets of consolidated VIEs		$	9,690		$	10,406		$	7,636		$	8,741
Liabilities:
Other liabilities (3)		$	86		$	86		$	128		$	128
Total liabilities of consolidated VIEs		$	86		$	86		$	128		$	128

⁽¹⁾ Includes perpetual securities

⁽²⁾ Consists of TREs, CMLs, MMLs, and alternative investments in limited partnerships

⁽³⁾ Consists entirely of derivatives

The Company is substantively the only investor in the consolidated VIEs listed in the table above. As the sole investor in these VIEs, the Company has the power to direct the activities of a variable interest entity that most significantly impact the entity's economic performance and is therefore considered to be the primary beneficiary of the VIEs that it consolidates. The Company also participates in substantially all of the variability created by these VIEs. The activities of these VIEs are limited to holding invested assets and foreign currency, and/or credit default swaps (CDS), as appropriate, and utilizing the cash flows from these securities to service its investment. Neither the Company nor any of its creditors are able to obtain the underlying collateral of the VIEs unless there is an event of default or other specified event. For those VIEs that contain a swap, the Company is not a direct counterparty to the swap contracts and has no control over them. The Company's loss exposure to these VIEs is limited to its original investment. The Company's consolidated VIEs do not rely on outside or ongoing sources of funding to support their activities beyond the underlying collateral and swap contracts, if applicable. With the exception of its investment in unit trust structures, the underlying collateral assets and funding of the Company's consolidated VIEs are generally static in nature and the underlying collateral and the reference corporate entities covered by any CDS contracts were all investment grade at the time of issuance.

24

Investments in Unit Trust Structures

The Company also utilizes unit trust structures in its Aflac Japan segment to invest in various asset classes. As the sole investor of these VIEs, the Company is required to consolidate these trusts under U.S. GAAP.

VIEs-Not Consolidated

The table below reflects the amortized cost, fair value and balance sheet caption in which the Company's investment in VIEs not consolidated are reported.

Investments in Variable Interest Entities Not Consolidated

	March 31, 2018						December 31, 2017
(In millions)	Amortized Cost			Fair Value			Amortized Cost			Fair Value
Assets:
Fixed maturity securities, available for sale (1)		$	5,194		$	5,749		$	5,004		$	5,724
Fixed maturity securities, held to maturity		2,711			3,077			2,549			2,929
Other investments		110			108			55			55
Total investments in VIEs not consolidated		$	8,015		$	8,934		$	7,608		$	8,708

⁽¹⁾ Includes perpetual securities

The Company holds alternative investments in limited partnerships that have been determined to be VIEs. These partnerships invest in private equity and structured investments. The Company’s maximum exposure to loss on these investments is limited to the amount of its investment. The Company is not the primary beneficiary of these VIEs and is therefore not required to consolidate them. The Company classifies these investments as Other investments in the consolidated balance sheets.

Certain investments in VIEs that the Company is not required to consolidate are investments that are in the form of debt obligations from the VIEs that are irrevocably and unconditionally guaranteed by their corporate parents or sponsors. These VIEs are the primary financing vehicles used by their corporate sponsors to raise financing in the capital markets. The variable interests created by these VIEs are principally or solely a result of the debt instruments issued by them. The Company does not have the power to direct the activities that most significantly impact the entity's economic performance, nor does it have the obligation to absorb losses of the entity or the right to receive benefits from the entity. As such, the Company is not the primary beneficiary of these VIEs and is therefore not required to consolidate them.

Securities Lending and Pledged Securities

The Company lends fixed maturity and public equity securities to financial institutions in short-term security-lending transactions. These short-term security-lending arrangements increase investment income with minimal risk. The Company's security lending policy requires that the fair value of the securities and/or unrestricted cash received as collateral be 102% or more of the fair value of the loaned securities. These securities continue to be carried as investment assets on the Company's balance sheet during the terms of the loans and are not reported as sales. The Company receives cash or other securities as collateral for such loans. For loans involving unrestricted cash or securities as collateral, the collateral is reported as an asset with a corresponding liability for the return of the collateral.

25

Details of the Company's securities lending activities were as follows:

Securities Lending Transactions Accounted for as Secured Borrowings
March 31, 2018
Remaining Contractual Maturity of the Agreements
(In millions)	Overnight and Continuous(1)		Up to 30 days		Total
Securities lending transactions:
Fixed maturity securities:
Japan government and agencies	$	0	$	4,894	$	4,894
Public utilities	30		0		30
Banks/financial institutions	52		0		52
Other corporate	384		0		384
Equity securities	8		0		8
Total borrowings	$	474	$	4,894	$	5,368
Gross amount of recognized liabilities for securities lending transactions					$	5,368
Amounts related to agreements not included in offsetting disclosure in Note 4					$	0

⁽¹⁾ These securities are pledged as collateral under the Company's U.S. securities lending program and can be called at its discretion; therefore, they are classified as Overnight and Continuous.

Securities Lending Transactions Accounted for as Secured Borrowings
December 31, 2017
Remaining Contractual Maturity of the Agreements
(In millions)	Overnight and Continuous(1)		Up to 30 days		Total
Securities lending transactions:
Fixed maturity securities:
Japan government and agencies	$	0	$	49	$	49
Public utilities	73		0		73
Banks/financial institutions	54		0		54
Other corporate	415		0		415
Equity securities	15		0		15
Total borrowings	$	557	$	49	$	606
Gross amount of recognized liabilities for securities lending transactions					$	606
Amounts related to agreements not included in offsetting disclosure in Note 4					$	0

⁽¹⁾ These securities are pledged as collateral under the Company's U.S. securities lending program and can be called at its discretion; therefore, they are classified as Overnight and Continuous.

The Company did not have any repurchase agreements or repurchase-to-maturity transactions outstanding as of March 31, 2018, and December 31, 2017, respectively.

Certain fixed maturity securities can be pledged as collateral as part of derivative transactions, or pledged to support state deposit requirements or certain investment programs. For additional information regarding pledged securities related to derivative transactions, see Note 4.

26

4. DERIVATIVE INSTRUMENTS

The Company's freestanding derivative financial instruments have historically consisted of: (1) foreign currency forwards and options used in hedging foreign exchange risk on U.S. dollar-denominated investments in Aflac Japan's portfolio; (2) foreign currency forwards and options used to hedge foreign exchange risk from the Company's net investment in Aflac Japan and economically hedge certain portions of forecasted cash flows denominated in yen; (3) swaps associated with the Company's notes payable, consisting of cross-currency interest rate swaps, also referred to as foreign currency swaps, associated with certain senior notes and its subordinated debentures; and (4) foreign currency swaps and credit default swaps that are associated with investments in special-purpose entities, including VIEs where the Company is the primary beneficiary. The Company does not use derivative financial instruments for trading purposes, nor does it engage in leveraged derivative transactions. Some of the Company's derivatives are designated as cash flow hedges, fair value hedges or net investment hedges; however, other derivatives do not qualify for hedge accounting or the Company elects not to designate them as an accounting hedge. The Company utilizes a net investment hedge to mitigate foreign exchange exposure resulting from its net investment in Aflac Japan. In addition to designating derivatives as hedging instruments, the Company has designated the majority of the Parent Company's yen-denominated liabilities (notes payable and loans) as nonderivative hedging instruments for this net investment hedge.

Derivative Types

Foreign currency forwards and options are executed for the Aflac Japan segment in order to hedge the currency risk on the carrying value of certain U.S. dollar-denominated investments. The average maturity of these forwards and options can change depending on factors such as market conditions and types of investments being held. In situations where the maturity of the forwards and options are shorter than the underlying investment being hedged, the Company may enter into new forwards and options near maturity of the existing derivative in order to continue hedging the underlying investment. In forward transactions, Aflac Japan agrees with another party to buy a fixed amount of yen and sell a corresponding amount of U.S. dollars at a specified future date. Aflac Japan also executes foreign currency option transactions in a collar strategy, where Aflac Japan agrees with another party to simultaneously purchase a fixed amount of U.S. dollar put options and sell U.S. dollar call options. The combination of these two actions results in no net premium being paid (i.e. a costless or zero-cost collar). The foreign currency forwards and options are used in fair value hedging relationships to mitigate the foreign exchange risk associated with U.S. dollar-denominated investments supporting yen-denominated liabilities.

Foreign currency forwards and options are also used to hedge the currency risk associated with the net investment in Aflac Japan. In these forward transactions, Aflac agrees with another party to buy a fixed amount of U.S. dollars and sell a corresponding amount of yen at a specified price at a specified future date. In the option transactions, the Company uses a combination of foreign currency options to protect expected future cash flows by simultaneously purchasing yen put options (options that protect against a weakening yen) and selling yen call options (options that limit participation in a strengthening yen). The combination of these two actions results in no net premium being paid (i.e. a costless or zero-cost collar).

The Company enters into foreign currency swaps pursuant to which it exchanges an initial principal amount in one currency for an initial principal amount of another currency, with an agreement to re-exchange the currencies at a future date at an agreed upon exchange rate. There may also be periodic exchanges of payments at specified intervals based on the agreed upon rates and notional amounts. Foreign currency swaps are used primarily in the consolidated VIEs in the Company's Aflac Japan portfolio to convert foreign-denominated cash flows to yen, the functional currency of Aflac Japan, in order to minimize cash flow fluctuations. The Company also uses foreign currency swaps to economically convert certain of its U.S. dollar-denominated senior note and subordinated debenture principal and interest obligations into yen-denominated obligations.

The only CDS that the Company currently holds relates to components of an investment in a VIE and is used to assume credit risk related to an individual security. This CDS contract entitles the consolidated VIE to receive periodic fees in exchange for an obligation to compensate the derivative counterparties should the referenced security issuer experience a credit event, as defined in the contract.

Periodically, the Company may enter into other derivative transactions depending on general economic conditions.

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Derivative Balance Sheet Classification

The tables below summarize the balance sheet classification of the Company's derivative fair value amounts, as well as the gross asset and liability fair value amounts. The fair value amounts presented do not include income accruals. The notional amount of derivative contracts represents the basis upon which pay or receive amounts are calculated and are not reflective of exposure or credit risk.

		March 31, 2018										December 31, 2017
(In millions)				Asset Derivatives			Liability Derivatives							Asset Derivatives			Liability Derivatives
Hedge Designation/ Derivative Type	Notional Amount			Fair Value			Fair Value				Notional Amount			Fair Value			Fair Value
Cash flow hedges:
Foreign currency swaps		$	75		$	1		$	(2	)		$	75		$	0		$	(8	)
Total cash flow hedges		75			1			(2		)		75			0			(8		)
Fair value hedges:
Foreign currency forwards		5,550			244			(5		)		7,640			2			(221		)
Foreign currency options		9,120			0			(3		)		7,670			0			(2		)
Total fair value hedges		14,670			244			(8		)		15,310			2			(223		)
Net investment hedge:
Foreign currency forwards		0			0			0				5			0			0
Foreign currency options		0			0			0				434			12			(1		)
Total net investment hedge		0			0			0				439			12			(1		)
Non-qualifying strategies:
Foreign currency swaps		5,426			369			(263		)		5,386			296			(189		)
Foreign currency forwards		6,656			182			(80		)		3,683			20			(53		)
Foreign currency options		299			0			0				770			0			0
Credit default swaps		94			1			0				88			1			0
Total non-qualifying strategies		12,475			552			(343		)		9,927			317			(242		)
Total derivatives		$	27,220		$	797		$	(353	)		$	25,751		$	331		$	(474	)
Balance Sheet Location
Other assets		$	18,248		$	797		$	0			$	10,948		$	331		$	0
Other liabilities		8,972			0			(353		)		14,803			0			(474		)
Total derivatives		$	27,220		$	797		$	(353	)		$	25,751		$	331		$	(474	)

Cash Flow Hedges

Certain of the Company's consolidated VIEs have foreign currency swaps that qualify for hedge accounting treatment. For those that have qualified, the Company has designated the derivative as a hedge of the variability in cash flows of a forecasted transaction or of amounts to be received or paid related to a recognized asset (“cash flow” hedge). The maximum length of time for which these cash flows are hedged is nine years. The remaining derivatives in the Company's consolidated VIEs that have not qualified for hedge accounting are included in “non-qualifying strategies.”

Fair Value Hedges

The Company designates and accounts for certain foreign currency forwards and options as fair value hedges when they meet the requirements for hedge accounting. These foreign currency forwards and options hedge the foreign currency exposure of certain U.S. dollar-denominated investments. The Company recognizes gains and losses on these derivatives and the related hedged items in current earnings within derivative and other gains (losses). The change in the fair value of the foreign currency forwards related to the changes in the difference between the spot rate and the forward price is excluded from the assessment of hedge effectiveness. The change in fair value of the foreign currency option related to the time value of the option is excluded from the assessment of hedge effectiveness.

28

The following table presents the gains and losses on derivatives and the related hedged items in fair value hedges.

Fair Value Hedging Relationships

(In millions)		Hedging Derivatives								Hedged Items
Hedging Derivatives	Hedged Items	Total Gains (Losses)			Gains (Losses) Excluded from Effectiveness Testing			Gains (Losses) Included in Effectiveness Testing		Gains (Losses)			Ineffectiveness Recognized for Fair Value Hedge
Three Months Ended March 31, 2018:
Foreign currency forwards	Fixed maturity securities	$	414		$	(39	)	$	453	$	(464	)	$	(11	)
Foreign currency options	Fixed maturity securities	(1		)	(1		)	0		0			0
Three Months Ended March 31, 2017:
Foreign currency forwards	Fixed maturity and equity securities	$	341		$	(48	)	$	389	$	(372	)	$	17
Foreign currency options	Fixed maturity securities	24			13			11		(10		)	1

Net Investment Hedge

The Company's investment in Aflac Japan is affected by changes in the yen/dollar exchange rate. To mitigate this exposure, the Parent Company's yen-denominated liabilities (see Note 8) have been designated as non-derivative hedges and foreign currency forwards and options have been designated as derivative hedges of the foreign currency exposure of the Company's net investment in Aflac Japan.

The Company's net investment hedge was effective during the three-month periods ended March 31, 2018 and 2017, respectively.

Non-qualifying Strategies

For the Company's derivative instruments in consolidated VIEs that do not qualify for hedge accounting treatment, all changes in their fair value are reported in current period earnings within derivative and other gains (losses). The amount of gain or loss recognized in earnings for the Company's VIEs is attributable to the derivatives in those investment structures. While the change in value of the swaps is recorded through current period earnings, the change in value of the available-for-sale fixed maturity securities associated with these swaps is recorded through other comprehensive income.

As of March 31, 2018, the Parent Company had cross-currency interest rate swap agreements related to its $550 million senior notes due March 2020, $350 million senior notes due February 2022, $700 million senior notes due June 2023, $750 million senior notes due November 2024 and $450 million senior notes due March 2025. Changes in the values of these swaps are recorded through current period earnings. For additional information regarding these swaps, see Note 8 in this report and Note 9 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

The Company uses foreign exchange forwards and options to mitigate the currency risk of some of its U.S. dollar-denominated loan receivables held within the Aflac Japan segment. The Company has not elected to apply hedge accounting for these loan receivables due to the change in fair value of the foreign exchange forwards and the foreign currency remeasurement of the loan receivables being recorded through current period earnings, and generally offsetting each other within realized investment gains (losses).

In order to economically mitigate currency risk of future yen dividends from Aflac Japan while lowering consolidated hedge costs associated with Aflac Japan's U.S. dollar investment hedging, starting in the first quarter of 2018, the Parent Company began entering into offsetting hedge positions using foreign exchange forwards and options. This activity is reported in the Corporate and other segment.

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Impact of Derivatives and Hedging Instruments

The following table summarizes the impact to realized investment gains (losses) and other comprehensive income (loss) from all derivatives and hedging instruments.

	Three Months Ended March 31,
	2018								2017
(In millions)	Realized Investment Gains (Losses)				Other Comprehensive Income (Loss)(1)				Realized Investment Gains (Losses)				Other Comprehensive Income (Loss)(1)
Qualifying hedges:
Cash flow hedges:
Foreign currency swaps		$	1			$	6			$	0			$	2
Total cash flow hedges		1				6				0				2
Fair value hedges:
Foreign currency forwards(2)		(50		)		0				(31		)		0
Foreign currency options(2)		(1		)		0				14				0
Total fair value hedges		(51		)		0				(17		)		0
Net investment hedge:
Non-derivative hedging instruments		0				(84		)		0				(17		)
Foreign currency forwards		0				0				0				(9		)
Foreign currency options		0				(8		)		0				(23		)
Total net investment hedge		0				(92		)		0				(49		)
Non-qualifying strategies:
Foreign currency swaps		14				0				(8		)		0
Foreign currency forwards		179				0				(27		)		0
Foreign currency options		1				0				0				0
Total non-qualifying strategies		194				0				(35		)		0
Total		$	144			$	(86	)		$	(52	)		$	(47	)

⁽¹⁾ Cash flow hedge items are recorded as unrealized gains (losses) on derivatives and net investment hedge items are recorded in the unrealized foreign currency translation gains (losses) line in the consolidated statement of comprehensive income (loss).

⁽²⁾ Impact shown net of effect of hedged items (see Fair Value Hedges section of this Note 4 for further detail)

The Company reclassified an immaterial amount related to its cash flow hedges from accumulated other comprehensive income (loss) into earnings for the three-month periods ended March 31, 2018 and 2017. There was no gain orloss reclassified from accumulated other comprehensive income (loss) into earnings related to the net investment hedge for the three-month periods ended March 31, 2018 and 2017. As of March 31, 2018, deferred gains and losses on derivative instruments recorded in accumulated other comprehensive income that are expected to be reclassified to earnings during the next twelve months were immaterial.

Credit Risk Assumed through Derivatives

For the foreign currency and credit default swaps associated with the Company's VIE investments for which it is the primary beneficiary, the Company bears the risk of loss due to counterparty default even though it is not a direct counterparty to those contracts.

The Company is a direct counterparty to the foreign currency swaps that it has entered into in connection with certain of its senior notes and subordinated debentures; foreign currency forwards; foreign currency options; and interest rate swaptions, and therefore the Company is exposed to credit risk in the event of nonperformance by the counterparties in those contracts. The risk of counterparty default for the Company's foreign currency swaps, certain foreign currency forwards, foreign currency options and interest rate swaptions is mitigated by collateral posting requirements that counterparties to those transactions must meet.

30

As of March 31, 2018, there were 15 counterparties to the Company's derivative agreements, with four comprising 59% of the aggregate notional amount. The counterparties to these derivatives are financial institutions with the following credit ratings:

	March 31, 2018										December 31, 2017
(In millions)	Notional Amount of Derivatives			Asset Derivatives Fair Value			Liability Derivatives Fair Value				Notional Amount of Derivatives			Asset Derivatives Fair Value			Liability Derivatives Fair Value
Counterparties' credit rating:
AA		$	4,685		$	123		$	(12	)		$	4,708		$	52		$	(37	)
A		22,081			673			(290		)		20,604			271			(370		)
BBB		454			1			(51		)		439			8			(67		)
Total		$	27,220		$	797		$	(353	)		$	25,751		$	331		$	(474	)

The Company engages in derivative transactions directly with unaffiliated third parties under International Swaps and Derivatives Association, Inc. (ISDA) agreements and other documentation. Most of the ISDA agreements also include Credit Support Annexes (CSAs) provisions, which generally provide for two-way collateral postings at the first dollar of exposure. The Company mitigates the risk that counterparties to transactions might be unable to fulfill their contractual obligations by monitoring counterparty credit exposure and collateral value while generally requiring that collateral be posted at the outset of the transaction. In addition, a significant portion of the derivative transactions have provisions that give the counterparty the right to terminate the transaction upon a downgrade of Aflac’s financial strength rating. The actual amount of payments that the Company could be required to make depends on market conditions, the fair value of outstanding affected transactions, and other factors prevailing at and after the time of the downgrade.

Collateral posted by the Company to third parties for derivative transactions can generally be repledged or resold by the counterparties. The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a net liability position by counterparty was approximately $154 million and $264 million as of March 31, 2018, and December 31, 2017, respectively. If the credit-risk-related contingent features underlying these agreements had been triggered on March 31, 2018, the Company estimates that it would be required to post a maximum of $5 million of additional collateral to these derivative counterparties. The Company is generally allowed to sell or repledge collateral obtained from its derivative counterparties, although it does not typically exercise such rights. (See the Offsetting tables below for collateral posted or received as of the reported balance sheet dates.)

Offsetting of Financial Instruments and Derivatives

Most of the Company's derivative instruments are subject to enforceable master netting arrangements that provide for the net settlement of all derivative contracts between the Parent Company or Aflac and its respective counterparty in the event of default or upon the occurrence of certain termination events. Collateral support agreements with the master netting arrangements generally provide that the Company will receive or pledge financial collateral at the first dollar of exposure.

The Company has securities lending agreements with unaffiliated financial institutions that post collateral to the Company in return for the use of its fixed maturity and public equity securities (see Note 3). When the Company has entered into securities lending agreements with the same counterparty, the agreements generally provide for net settlement in the event of default by the counterparty. This right of set-off allows the Company to keep and apply collateral received if the counterparty failed to return the securities borrowed from the Company as contractually agreed.

The tables below summarize the Company's derivatives and securities lending transactions, and as reflected in the tables, in accordance with U.S. GAAP, the Company's policy is to not offset these financial instruments in the Consolidated Balance Sheets.

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Offsetting of Financial Assets and Derivative Asset

March 31, 2018
										Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Assets			Gross Amount Offset in Balance Sheet			Net Amount of Assets Presented  in Balance Sheet			Financial Instruments				Securities Collateral			Cash Collateral Received				Net Amount
Derivative   assets:
Derivative       assets subject to a       master netting       agreement or       offsetting       arrangement		$	556		$	0		$	556		$	(116	)	$	(343	)		$	(67	)		$	30
Derivative       assets not subject       to a master netting       agreement or       offsetting       arrangement		241						241														241
Total derivative       assets		797			0			797			(116		)	(343		)		(67		)		271
Securities lending    and similar    arrangements		5,249			0			5,249			0			0				(5,249		)		0
Total		$	6,046		$	0		$	6,046		$	(116	)	$	(343	)		$	(5,316	)		$	271

32

December 31, 2017
										Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Assets			Gross Amount Offset in Balance Sheet			Net Amount of Assets Presented  in Balance Sheet			Financial Instruments				Securities Collateral		Cash Collateral Received				Net Amount
Derivative   assets:
Derivative       assets subject to a       master netting       agreement or       offsetting       arrangement		$	180		$	0		$	180		$	(82	)	$	0		$	(98	)		$	0
Derivative       assets not subject       to a master netting       agreement or       offsetting       arrangement		151						151													151
Total derivative       assets		331			0			331			(82		)	0			(98		)		151
Securities lending    and similar    arrangements		592			0			592			0			0			(592		)		0
Total		$	923		$	0		$	923		$	(82	)	$	0		$	(690	)		$	151

Offsetting of Financial Liabilities and Derivative Liabilities

March 31, 2018
												Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Liabilities				Gross Amount Offset in Balance Sheet			Net Amount of Liabilities Presented  in Balance Sheet				Financial Instruments			Securities Collateral		Cash Collateral Pledged			Net Amount
Derivative   liabilities:
Derivative       liabilities subject       to a master netting       agreement or       offsetting       arrangement		$	(267	)		$	0		$	(267	)		$	116	$	36		$	113		$	(2	)
Derivative       liabilities not       subject to a       master netting       agreement or       offsetting       arrangement		(86		)					(86		)										(86		)
Total derivative       liabilities		(353		)		0			(353		)		116		36			113			(88		)
Securities lending    and similar    arrangements		(5,368		)		0			(5,368		)		5,249		0			0			(119		)
Total		$	(5,721	)		$	0		$	(5,721	)		$	5,365	$	36		$	113		$	(207	)

33

December 31, 2017
												Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Liabilities				Gross Amount Offset in Balance Sheet			Net Amount of Liabilities Presented  in Balance Sheet				Financial Instruments			Securities Collateral		Cash Collateral Pledged			Net Amount
Derivative   liabilities:
Derivative       liabilities subject       to a master netting       agreement or       offsetting       arrangement		$	(346	)		$	0		$	(346	)		$	82	$	245		$	10		$	(9	)
Derivative       liabilities not       subject to a       master netting       agreement or       offsetting       arrangement		(128		)					(128		)										(128		)
Total derivative       liabilities		(474		)		0			(474		)		82		245			10			(137		)
Securities lending    and similar    arrangements		(606		)		0			(606		)		592		0			0			(14		)
Total		$	(1,080	)		$	0		$	(1,080	)		$	674	$	245		$	10		$	(151	)

For additional information on the Company's financial instruments, see the accompanying Notes 1, 3 and 5 and Notes 1, 3 and 5 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

5. FAIR VALUE MEASUREMENTS

Fair Value Hierarchy

U.S. GAAP specifies a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. These two types of inputs create three valuation hierarchy levels. Level 1 valuations reflect quoted market prices for identical assets or liabilities in active markets. Level 2 valuations reflect quoted market prices for similar assets or liabilities in an active market, quoted market prices for identical or similar assets or liabilities in non-active markets or model-derived valuations in which all significant valuation inputs are observable in active markets. Level 3 valuations reflect valuations in which one or more of the significant inputs are not observable in an active market.

34

The following tables present the fair value hierarchy levels of the Company's assets and liabilities that are measured and carried at fair value on a recurring basis.

	March 31, 2018
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities:(1)
Government and agencies		$	35,325		$	1,411		$	0		$	36,736
Municipalities		0			1,373			0			1,373
Mortgage- and asset-backed securities		0			269			186			455
Public utilities		0			7,724			83			7,807
Sovereign and supranational		0			1,866			0			1,866
Banks/financial institutions		0			9,120			24			9,144
Other corporate		0			31,509			143			31,652
Total fixed maturity securities		35,325			53,272			436			89,033		(1)
Equity securities (1)		1,015			77			16			1,108		(1)
Cash and cash equivalents		4,080			0			0			4,080
Other assets:
Foreign currency swaps		0			130			240			370
Foreign currency forwards		0			426			0			426
Credit default swaps		0			0			1			1
Total other assets		0			556			241			797
Total assets		$	40,420		$	53,905		$	693		$	95,018
Liabilities:
Other liabilities:
Foreign currency swaps		$	0		$	179		$	86		$	265
Foreign currency forwards		0			85			0			85
Foreign currency options		0			3			0			3
Total liabilities		$	0		$	267		$	86		$	353

⁽¹⁾ Includes perpetual securities

35

	December 31, 2017
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Government and agencies		$	30,109		$	1,121		$	0		$	31,230
Municipalities		0			1,370			0			1,370
Mortgage- and asset-backed securities		0			269			175			444
Public utilities		0			7,886			68			7,954
Sovereign and supranational		0			1,909			0			1,909
Banks/financial institutions		0			8,908			25			8,933
Other corporate		0			32,327			146			32,473
Total fixed maturity securities		30,109			53,790			414			84,313		(1)
Equity securities		1,001			6			16			1,023
Other investments		57			0			0			57
Cash and cash equivalents		3,491			0			0			3,491
Other assets:
Foreign currency swaps		0			146			150			296
Foreign currency forwards		0			22			0			22
Foreign currency options		0			12			0			12
Credit default swaps		0			0			1			1
Total other assets		0			180			151			331
Total assets		$	34,658		$	53,976		$	581		$	89,215
Liabilities:
Other liabilities:
Foreign currency swaps		$	0		$	69		$	128		$	197
Foreign currency forwards		0			274			0			274
Foreign currency options		0			3			0			3
Total liabilities		$	0		$	346		$	128		$	474

⁽¹⁾ Includes perpetual securities

36

The following tables present the carrying amount and fair value categorized by fair value hierarchy level for the Company's financial instruments that are not carried at fair value.

	March 31, 2018
(In millions)	Carrying Value			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies		$	22,686		$	28,317		$	0		$	0		$	28,317
Municipalities		379			0			493			0			493
Mortgage and asset-backed securities		26			0			9			19			28
Public utilities		3,508			0			3,891			0			3,891
Sovereign and supranational		1,620			0			1,919			0			1,919
Banks/financial institutions		2,300			0			2,477			0			2,477
Other corporate		2,858			0			3,343			0			3,343
Other investments (1)		4,608			0			15			4,575			4,590
Total assets		$	37,985		$	28,317		$	12,147		$	4,594		$	45,058
Liabilities:
Other policyholders’ funds		$	7,417		$	0		$	0		$	7,307		$	7,307
Notes payable (excluding capital leases)		5,352			0			5,146			281			5,427
Total liabilities		$	12,769		$	0		$	5,146		$	7,588		$	12,734

⁽¹⁾Excludes policy loans of $227 and equity method investments of $238, at carrying value

37

	December 31, 2017
(In millions)	Carrying Value			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies		$	21,331		$	26,491		$	0		$	0		$	26,491
Municipalities		357			0			462			0			462
Mortgage and asset-backed securities		26			0			8			19			27
Public utilities		3,300			0			3,698			0			3,698
Sovereign and supranational		1,523			0			1,835			0			1,835
Banks/financial institutions		2,206			0			2,387			0			2,387
Other corporate		2,687			0			3,172			0			3,172
Other investments (1)		3,017			0			15			2,987			3,002
Total assets		$	34,447		$	26,491		$	11,577		$	3,006		$	41,074
Liabilities:
Other policyholders’ funds		$	6,939		$	0		$	0		$	6,841		$	6,841
Notes payable (excluding capital leases)		5,267			0			5,288			265			5,553
Total liabilities		$	12,206		$	0		$	5,288		$	7,106		$	12,394

⁽¹⁾Excludes policy loans of $210 and equity method investments of $118, at carrying value

Fair Value of Financial Instruments

Fixed maturity and equity securities

The Company determines the fair values of fixed maturity securities and public and privately-issued equity securities using the following approaches or techniques: price quotes and valuations from third party pricing vendors (including quoted market prices readily available from public exchange markets) and non-binding price quotes the Company obtains from outside brokers.

A third party pricing vendor has developed valuation models to determine fair values of privately issued securities to reflect the impact of the persistent economic environment and the changing regulatory framework. These models are discounted cash flow (DCF) valuation models, but also use information from related markets, specifically the CDS market to estimate expected cash flows. These models take into consideration any unique characteristics of the securities and make various adjustments to arrive at an appropriate issuer-specific loss adjusted credit curve. This credit curve is then used with the relevant recovery rates to estimate expected cash flows and modeling of additional features, including illiquidity adjustments, if necessary, to price the security by discounting those loss adjusted cash flows. In cases where a credit curve cannot be developed from the specific security features, the valuation methodology takes into consideration other market observable inputs, including: 1) the most appropriate comparable security(ies) of the issuer; 2) issuer-specific CDS spreads; 3) bonds or CDS spreads of comparable issuers with similar characteristics such as rating, geography, or sector; or 4) bond indices that are comparative in rating, industry, maturity and region.

The pricing data and market quotes the Company obtains from outside sources, including third party pricing services, are reviewed internally for reasonableness. If a fair value appears unreasonable, the Company will re-examine the inputs and assess the reasonableness of the pricing data with the vendor. Additionally, the Company may compare the inputs to relevant market indices and other performance measurements. Based on management's analysis, the valuation is confirmed or may be revised if there is evidence of a more appropriate estimate of fair value based on available market

38

data. The Company has performed verification of the inputs and calculations in any valuation models to confirm that the valuations represent reasonable estimates of fair value.

The fixed maturity securities classified as Level 3 consist of securities with limited or no observable valuation inputs. For Level 3 securities, the Company estimates the fair value of these securities by obtaining non-binding broker quotes from a limited number of brokers. These brokers base their quotes on a combination of their knowledge of the current pricing environment and market conditions. The Company considers these inputs to be unobservable. The Company also considers a variety of significant valuation inputs in the valuation process, including forward exchange rates, yen swap rates, dollar swap rates, interest rate volatilities, credit spread data on specific issuers, assumed default and default recovery rates, and certain probability assumptions. In obtaining these valuation inputs, the Company has determined that certain pricing assumptions and data used by its pricing sources are difficult to validate or corroborate by the market and/or appear to be internally developed rather than observed in or corroborated by the market. The use of these unobservable valuation inputs causes more subjectivity in the valuation process for these securities.

For the periods presented, the Company has not adjusted the quotes or prices it obtains from the pricing services and brokers it uses.

The following tables present the pricing sources for the fair values of the Company's fixed maturity and equity securities.

39

	March 31, 2018
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Government and agencies:
Third party pricing vendor		$	35,325		$	1,411		$	0		$	36,736
Total government and agencies		35,325			1,411			0			36,736
Municipalities:
Third party pricing vendor		0			1,373			0			1,373
Total municipalities		0			1,373			0			1,373
Mortgage- and asset-backed securities:
Third party pricing vendor		0			269			0			269
Broker/other		0			0			186			186
Total mortgage- and asset-backed securities		0			269			186			455
Public utilities:
Third party pricing vendor		0			7,724			0			7,724
Broker/other		0			0			83			83
Total public utilities		0			7,724			83			7,807
Sovereign and supranational:
Third party pricing vendor		0			1,866			0			1,866
Total sovereign and supranational		0			1,866			0			1,866
Banks/financial institutions:
Third party pricing vendor		0			9,120			0			9,120
Broker/other		0			0			24			24
Total banks/financial institutions		0			9,120			24			9,144
Other corporate:
Third party pricing vendor		0			31,509			0			31,509
Broker/other		0			0			143			143
Total other corporate		0			31,509			143			31,652
Total securities available for sale		$	35,325		$	53,272		$	436		$	89,033	(1)
Equity securities, carried at fair value: (1)
Third party pricing vendor		$	1,015		$	77		$	0		$	1,092
Broker/other		0			0			16			16
Total equity securities		$	1,015		$	77		$	16		$	1,108	(1)

⁽¹⁾ Includes perpetual securities

40

	March 31, 2018
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies:
Third party pricing vendor		$	28,317		$	0		$	0		$	28,317
Total government and agencies		28,317			0			0			28,317
Municipalities:
Third party pricing vendor		0			493			0			493
Total municipalities		0			493			0			493
Mortgage- and asset-backed securities:
Third party pricing vendor		0			9			0			9
Broker/other		0			0			19			19
Total mortgage- and asset-backed securities		0			9			19			28
Public utilities:
Third party pricing vendor		0			3,891			0			3,891
Total public utilities		0			3,891			0			3,891
Sovereign and supranational:
Third party pricing vendor		0			1,919			0			1,919
Total sovereign and supranational		0			1,919			0			1,919
Banks/financial institutions:
Third party pricing vendor		0			2,477			0			2,477
Total banks/financial institutions		0			2,477			0			2,477
Other corporate:
Third party pricing vendor		0			3,343			0			3,343
Total other corporate		0			3,343			0			3,343
Total securities held to maturity		$	28,317		$	12,132		$	19		$	40,468

41

	December 31, 2017
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Government and agencies:
Third party pricing vendor		$	30,109		$	1,121		$	0		$	31,230
Total government and agencies		30,109			1,121			0			31,230
Municipalities:
Third party pricing vendor		0			1,370			0			1,370
Total municipalities		0			1,370			0			1,370
Mortgage- and asset-backed securities:
Third party pricing vendor		0			269			0			269
Broker/other		0			0			175			175
Total mortgage- and asset-backed securities		0			269			175			444
Public utilities:
Third party pricing vendor		0			7,886			0			7,886
Broker/other		0			0			68			68
Total public utilities		0			7,886			68			7,954
Sovereign and supranational:
Third party pricing vendor		0			1,807			0			1,807
Broker/other		0			102			0			102
Total sovereign and supranational		0			1,909			0			1,909
Banks/financial institutions:
Third party pricing vendor		0			8,908			0			8,908
Broker/other		0			0			25			25
Total banks/financial institutions		0			8,908			25			8,933
Other corporate:
Third party pricing vendor		0			32,327			0			32,327
Broker/other		0			0			146			146
Total other corporate		0			32,327			146			32,473
Total securities available for sale		$	30,109		$	53,790		$	414		$	84,313	(1)
Equity securities, carried at fair value:
Third party pricing vendor		$	1,001		$	6		$	0		$	1,007
Broker/other		0			0			16			16
Total equity securities		$	1,001		$	6		$	16		$	1,023

⁽¹⁾ Includes perpetual securities

42

	December 31, 2017
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies:
Third party pricing vendor		$	26,491		$	0		$	0		$	26,491
Total government and agencies		26,491			0			0			26,491
Municipalities:
Third party pricing vendor		0			462			0			462
Total municipalities		0			462			0			462
Mortgage- and asset-backed securities:
Third party pricing vendor		0			8			0			8
Broker/other		0			0			19			19
Total mortgage- and asset-backed securities		0			8			19			27
Public utilities:
Third party pricing vendor		0			3,698			0			3,698
Total public utilities		0			3,698			0			3,698
Sovereign and supranational:
Third party pricing vendor		0			1,835			0			1,835
Total sovereign and supranational		0			1,835			0			1,835
Banks/financial institutions:
Third party pricing vendor		0			2,387			0			2,387
Total banks/financial institutions		0			2,387			0			2,387
Other corporate:
Third party pricing vendor		0			3,172			0			3,172
Total other corporate		0			3,172			0			3,172
Total securities held to maturity		$	26,491		$	11,562		$	19		$	38,072

43

The following is a discussion of the determination of fair value of the Company's remaining financial instruments.

Derivatives

The Company uses derivative instruments to manage the risk associated with certain assets. However, the derivative instrument may not be classified in the same fair value hierarchy level as the associated asset. Inputs used to value derivatives include, but are not limited to, interest rates, credit spreads, foreign currency forward and spot rates, and interest volatility.

The fair values of the foreign currency forwards and options associated with certain investments; the foreign currency forwards and options used to hedge foreign exchange risk from the Company's net investment in Aflac Japan and economically hedge certain portions of forecasted cash flows denominated in yen; and the foreign currency swaps associated with certain senior notes and subordinated debentures are based on the amounts the Company would expect to receive or pay. The determination of the fair value of these derivatives is based on observable market inputs, therefore they are classified as Level 2.

For derivatives associated with VIEs where the Company is the primary beneficiary, the Company is not the direct counterparty to the swap contracts. As a result, the fair value measurements incorporate the credit risk of the collateral associated with the VIE. The Company receives valuations from a third party pricing vendor for these derivatives. Based on an analysis of these derivatives and a review of the methodology employed by the pricing vendor, the Company determined that due to the long duration of these swaps and the need to extrapolate from short-term observable data to derive and measure long-term inputs, certain inputs, assumptions and judgments are required to value future cash flows that cannot be corroborated by current inputs or current observable market data. As a result, the derivatives associated with the Company's consolidated VIEs are classified as Level 3 of the fair value hierarchy.

Other investments

Other investments where fair value is disclosed above include short-term investments and loan receivables. Loan receivables include transitional real estate loans, commercial mortgage loans and middle market loans. The Company's loan receivables do not have readily determinable market prices and generally lack market liquidity. Fair values for loan receivables are determined based on the present value of expected future cash flows discounted at the applicable U.S. Treasury or London Interbank Offered Rate (LIBOR) yield plus an appropriate spread that considers other risk factors, such as credit and liquidity risk. These spreads are provided by the applicable asset managers based on their knowledge of the current loan pricing environment and market conditions. The spreads are a significant component of the pricing inputs and are generally considered unobservable. Therefore, these investments have been assigned a Level 3 within the fair value hierarchy.

Other policyholders' funds

The largest component of the other policyholders' funds liability is the Company's annuity line of business in Aflac Japan. The Company's annuities have fixed benefits and premiums. For this product, the Company estimates the fair value to be equal to the cash surrender value. This is analogous to the value paid to policyholders on the valuation date if they were to surrender their policy. The Company periodically checks the cash value against discounted cash flow projections for reasonableness. The Company considers its inputs for this valuation to be unobservable and have accordingly classified this valuation as Level 3.

Notes payable

The fair values of the Company's publicly issued notes payable are determined by utilizing available sources of observable inputs from third party pricing vendors and are classified as Level 2. The fair values of the Company's yen-denominated loans approximate their carrying values and are classified as Level 3.

44

Transfers between Hierarchy Levels and Level 3 Rollforward

During the three-month periods ended March 31, 2018 and 2017, respectively, there were no transfers between Level 1 and 2 for assets and liabilities that are measured and carried at fair value on a recurring basis.

The following tables present the changes in fair value of the Company's investments and derivatives carried at fair value classified as Level 3.

Three Months Ended March 31, 2018
	Fixed Maturity Securities											Equity Securities		Derivatives (1)
(In millions)	Mortgage- and Asset- Backed Securities		Public Utilities			Banks/ Financial Institutions			Other Corporate					Foreign Currency Swaps		Credit Default Swaps		Total
Balance, beginning of period	$	175	$	68		$	25		$	146		$	16	$	22	$	1	$	453
Realized investment gains (losses) included in earnings	0		0			0			0			0		126		0		126
Unrealized gains (losses) included in other comprehensive income (loss)	11		(1		)	(1		)	(2		)	0		6		0		13
Purchases, issuances, sales and settlements:
Purchases	0		16			0			0			0		0		0		16
Issuances	0		0			0			0			0		0		0		0
Sales	0		0			0			0			0		0		0		0
Settlements	0		0			0			(1		)	0		0		0		(1		)
Transfers into Level 3	0		0			0			0			0		0		0		0
Transfers out of Level 3	0		0			0			0			0		0		0		0
Balance, end of period	$	186	$	83		$	24		$	143		$	16	$	154	$	1	$	607
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in realized investment gains (losses)	$	0	$	0		$	0		$	0		$	0	$	126	$	0	$	126

⁽¹⁾ Derivative assets and liabilities are presented net

Three Months Ended March 31, 2017
	Fixed Maturity Securities										Equity Securities			Derivatives (1)
(In millions)	Mortgage- and Asset- Backed Securities			Public Utilities		Banks/ Financial Institutions			Other Corporate					Foreign Currency Swaps			Credit Default Swaps		Total
Balance, beginning of period	$	198		$	16	$	25		$	0	$	3		$	(21	)	$	2	$	223
Realized investment gains (losses) included    in earnings	0			0		0			0		0			38			0		38
Unrealized gains (losses) included in other    comprehensive income (loss)	6			0		(1		)	0		0			2			0		7
Purchases, issuances, sales and settlements:
Purchases	0			0		0			35		2			0			0		37
Issuances	0			0		0			0		0			0			0		0
Sales	0			0		0			0		(1		)	0			0		(1		)
Settlements	(9		)	0		0			0		0			0			0		(9		)
Transfers into Level 3	0			0		0			0		0			0			0		0
Transfers out of Level 3	0			0		0			0		0			0			0		0
Balance, end of period	$	195		$	16	$	24		$	35	$	4		$	19		$	2	$	295
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in realized investment gains (losses)	$	0		$	0	$	0		$	0	$	0		$	38		$	0	$	38

⁽¹⁾ Derivative assets and liabilities are presented net

45

Fair Value Sensitivity

Level 3 Significant Unobservable Input Sensitivity

The following tables summarize the significant unobservable inputs used in the valuation of the Company's Level 3 investments and derivatives carried at fair value. Included in the tables are the inputs or range of possible inputs that have an effect on the overall valuation of the financial instruments.

March 31, 2018
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities:
Mortgage- and asset-backed securities		$	186	Consensus pricing	Offered quotes	N/A	(c)
Public utilities		83		Discounted cash flow	Credit spreads	N/A	(c)
Banks/financial institutions		24		Consensus pricing	Offered quotes	N/A	(c)
Other corporate		143		Discounted cash flow	Credit spreads	N/A	(c)
Equity securities		16		Net asset value	Offered quotes	N/A	(c)
Other assets:
Foreign currency swaps		185		Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	13 - 101 bps
		55		Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Credit default swaps		1		Discounted cash flow	Base correlation	49.98% - 54.13%	(d)
					CDS spreads	15 bps
					Recovery rate	37.24%
Total assets		$	693

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

(c) N/A represents securities where the Company receives unadjusted broker quotes and for which there is no transparency into the providers' valuation techniques or unobservable inputs.

(d) Range of base correlation for the Company's bespoke tranche for attachment and detachment points corresponding to market indices

46

March 31, 2018
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Liabilities:
Other liabilities:
Foreign currency swaps		$	84	Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	17 - 170 bps
		2		Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Total liabilities		$	86

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

47

December 31, 2017
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities:
Mortgage- and asset-backed securities		$	175	Consensus pricing	Offered quotes	N/A	(c)
Public utilities		68		Discounted cash flow	Credit spreads	N/A	(c)
Banks/financial institutions		25		Consensus pricing	Offered quotes	N/A	(c)
Other corporate		146		Discounted cash flow	Credit spreads	N/A	(c)
Equity securities		16		Net asset value	Offered quotes	N/A	(c)
Other assets:
Foreign currency swaps		80		Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	9 - 90 bps
		70		Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Credit default swaps		1		Discounted cash flow	Base correlation	46.33% - 49.65%	(d)
					CDS spreads	25 bps
					Recovery rate	37.24%
Total assets		$	581

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

(c) N/A represents securities where the Company receives unadjusted broker quotes and for which there is no transparency into the providers' valuation techniques or unobservable inputs.

(d) Range of base correlation for the Company's bespoke tranche for attachment and detachment points corresponding to market indices

48

December 31, 2017
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Liabilities:
Other liabilities:
Foreign currency swaps		$	120	Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	13 - 157 bps
		8		Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Total liabilities		$	128

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

49

The following is a discussion of the significant unobservable inputs or valuation techniques used in determining the fair value of securities and derivatives classified as Level 3.

Net Asset Value

The Company holds certain unlisted equity securities whose fair value is derived based on the financial statements published by the investee. These securities do not trade on an active market and the valuations derived are dependent on the availability of timely financial reporting of the investee. Net asset value is an unobservable input in the determination of fair value ofequity securities.

Offered Quotes

In circumstances where the Company's valuation model price is overridden because it implies a value that is not consistent with current market conditions, the Company will solicit bids from a limited number of brokers. The Company also receives unadjusted prices from brokers for its mortgage and asset-backed securities. These quotes are non-binding but are reflective of valuation best estimates at that particular point in time. Offered quotes are an unobservable input in the determination of fair value of mortgage- and asset-backed securities, certain banks/financial institutions, certain other corporate, and equity securities investments.

Interest Rates, CDS Spreads, Foreign Exchange Rates

The significant drivers of the valuation of the interest and foreign exchange swaps are interest rates, foreign exchange rates and CDS spreads. The Company's swaps have long maturities that increase the sensitivity of the swaps to interest rate fluctuations. Since most of the Company's yen-denominated cross currency swaps are in a net liability position, an increase in interest rates will decrease the liabilities and increase the value of the swap.

Foreign exchange swaps also have a lump-sum final settlement of foreign exchange principal receivables at the termination of the swap. An increase in yen interest rates will decrease the value of the final settlement foreign exchange receivables and decrease the value of the swap, and an increase in U.S. dollar interest rates will increase the swap value.

A similar sensitivity pattern is observed for the foreign exchange rates. When the spot U.S. dollar/Japanese yen (USD/JPY) foreign exchange rate decreases and the swap is receiving a final exchange payment in JPY, the swap value will increase due to the appreciation of the JPY. Most of the Company's swaps are designed to receive payments in JPY at the termination and will thus be impacted by the USD/JPY foreign exchange rate in this way. In cases where there is no final foreign exchange receivable in JPY and the Company is paying JPY as interest payments and receiving USD, a decrease in the foreign exchange rate will lead to a decrease in the swap value.

The extinguisher feature in most of the Company's VIE swaps results in a cessation of cash flows and no further payments between the parties to the swap in the event of a default on the referenced or underlying collateral. To price this feature, the Company applies the survival probability of the referenced entity to the projected cash flows. The survival probability uses the CDS spreads and recovery rates to adjust the present value of the cash flows. For extinguisher swaps with positive values, an increase in CDS spreads decreases the likelihood of receiving the final exchange payments and reduces the value of the swap.

Base Correlations, CDS Spreads, Recovery Rates

The Company's remaining collateralized debt obligation (CDO) is a tranche on a basket of single-name credit default swaps. The risk in this synthetic CDO comes from the single-name CDS risk and the correlations between the single names. The valuation of synthetic CDOs is dependent on the calibration of market prices for interest rates, single name CDS default probabilities and base correlation using financial modeling tools. Since there is limited or no observable data available for this tranche, the base correlations must be obtained from commonly traded market tranches such as the CDX and iTraxx indices. From the historical prices of these indices, base correlations can be obtained to develop a pricing curve of CDOs with different seniorities. Since the reference entities of the market indices do not match those in the portfolio underlying the synthetic CDO to be valued, several processing steps are taken to map the CDO in the Company's portfolio to the indices. With the base correlation determined and the appropriate spreads selected, a valuation is calculated. An increase in the CDS spreads in the underlying portfolio leads to a decrease in the value due to higher probability of defaults and losses. The impact on the valuation due to base correlation depends on a number of factors, including the riskiness between market tranches and the modeled tranche based on the Company's portfolio and the equivalence between detachment points in these tranches. Generally speaking, an increase in base correlation will

50

decrease the value of the senior tranches while increasing the value of junior tranches. This may result in a positive or negative value change.

The CDO tranche in the Company's portfolio is a senior mezzanine tranche and, due to the low level of credit support for this type of tranche, exhibits equity-like behavior. As a result, an increase in recovery rates tends to cause its value to decrease.

Base correlations, CDS spreads, and recovery rates are unobservable inputs in the determination of fair value of credit default swaps.

For additional information on the Company's investments and financial instruments, see the accompanying Notes 1, 3 and 4 and Notes 1, 3 and 4 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

6. POLICY LIABILITIES

Changes in the liability for unpaid policy claims were as follows:

	Three Months Ended March 31,
(In millions)		2018			2017
Unpaid supplemental health claims, beginning of period		$	3,884		$	3,707
Less reinsurance recoverables		30			27
Net balance, beginning of period		3,854			3,680
Add claims incurred during the period related to:
Current year		1,842			1,737
Prior years		(192		)	(111		)
Total incurred		1,650			1,626
Less claims paid during the period on claims incurred during:
Current year		518			505
Prior years		1,116			1,055
Total paid		1,634			1,560
Effect of foreign exchange rate changes on unpaid claims		142			80
Net balance, end of period		4,012			3,826
Add reinsurance recoverables		31			29
Unpaid supplemental health claims, end of period		4,043			3,855
Unpaid life claims, end of period		587			375
Total liability for unpaid policy claims		$	4,630		$	4,230

The incurred claims development related to prior years reflects favorable claims experience compared to previous estimates. The favorable claims development of $192 million for the three-month period ended March 31, 2018 comprises approximately $97 million from Japan, which represents approximately 51% of the total. Excluding the impact of foreign exchange of a loss of approximately $5 million from December 31, 2017 to March 31, 2018, the favorable claims development in Japan would have been approximately $92 million, representing approximately 48% of the total.

The Company has experienced continued favorable claim trends in 2018 for its core health products in Japan. The Company's experience in Japan related to the average length of stay in the hospital for cancer treatment has shown continued decline in the current period. In addition, cancer treatment patterns in Japan are continuing to be influenced by significant advances in early-detection techniques and by the increased use of pathological diagnosis rather than clinical exams. Additionally, follow-up radiation and chemotherapy treatments are occurring more often on an outpatient basis. Such changes in treatment not only increase the quality of life and initial outcomes for the patients, but also decrease the average length of each hospital stay, resulting in favorable claims development.

The remainder of the favorable claims development related to prior years for the three-month period ended March 31, 2018, reflects Aflac U.S. favorable claims experience compared to previous estimates, primarily in the cancer and accident lines of business.

51

7. REINSURANCE

The Company periodically enters into fixed quota-share coinsurance agreements with other companies in the normal course of business. For each of its reinsurance agreements, the Company determines whether the agreement provides indemnification against loss or liability relating to insurance risk in accordance with applicable accounting standards. Reinsurance premiums and benefits paid or provided are accounted for on bases consistent with those used in accounting for the original policies issued and the terms of the reinsurance contracts. Premiums and benefits are reported net of insurance ceded.

The Company has recorded a deferred profit liability related to reinsurance transactions. The remaining deferred profit liability of $1.0 billion, as of March 31, 2018, is included in future policy benefits in the consolidated balance sheet and is being amortized into income over the expected lives of the policies. The Company has also recorded a reinsurance recoverable for reinsurance transactions, which is included in other assets in the consolidated balance sheet and had a remaining balance of $969 million and $908 million as of March 31, 2018, and December 31, 2017, respectively. The increase in the reinsurance recoverable balance was driven by two aggregating factors: yen strengthening and the growth in reserves related to the business that has been reinsured as the policies age. The spot yen/dollar exchange rate strengthened by approximately 6.4%and ceded reserves increased approximately .4% from December 31, 2017, to March 31, 2018.

The following table reconciles direct premium income and direct benefits and claims to net amounts after the effect of reinsurance.

	Three Months Ended March 31,
(In millions)	2018				2017
Direct premium income		$	4,833			$	4,724
Ceded to other companies:
Ceded Aflac Japan closed blocks		(129		)		(130		)
Other		(15		)		(12		)
Assumed from other companies:
Retrocession activities		54				54
Other		2				2
Net premium income		$	4,745			$	4,638
Direct benefits and claims		$	3,119			$	3,129
Ceded benefits and change in reserves for future benefits:
Ceded Aflac Japan closed blocks		(117		)		(122		)
Eliminations		12				13
Other		(12		)		(11		)
Assumed from other companies:
Retrocession activities		52				54
Eliminations		(12		)		(13		)
Other		0				2
Benefits and claims, net		$	3,042			$	3,052

These reinsurance transactions are indemnity reinsurance that do not relieve the Company from its obligations to policyholders. In the event that the reinsurer is unable to meet their obligations, the Company remains liable for the reinsured claims.

As a part of its capital contingency plan, the Company entered into a committed reinsurance facility agreement on December 1, 2015 in the amount of approximately 110 billion yen. This reinsurance facility agreement was renewed in 2017 and is effective until December 31, 2018. There are also additional commitment periods of a one-year duration each which are automatically extended unless notification is received from the reinsurer within 60 days prior to the expiration.

52

The reinsurer can withdraw from the committed facility if Aflac‘s Standard and Poor's (S&P) rating drops below BBB-. As of March 31, 2018, the Company has not executed a reinsurance treaty under this committed reinsurance facility.

8. NOTES PAYABLE

A summary of notes payable follows:

(In millions)	March 31, 2018			December 31, 2017
2.40% senior notes due March 2020		$	548		$	548
4.00% senior notes due February 2022		348			348
3.625% senior notes due June 2023		697			697
3.625% senior notes due November 2024		746			745
3.25% senior notes due March 2025		446			446
2.875% senior notes due October 2026		297			297
6.90% senior notes due December 2039		220			220
6.45% senior notes due August 2040		254			254
4.00% senior notes due October 2046		394			394
Yen-denominated senior notes and subordinated debentures:
.932% senior notes due January 2027 (principal amount 60.0 billion yen)		562			528
2.108% subordinated debentures due October 2047 (principal amount 60.0 billion yen)		559			526
Yen-denominated loans:
Variable interest rate loan due September 2021 (.32% in 2018 and 2017, principal amount 5.0 billion yen)		47			44
Variable interest rate loan due September 2023 (.47% in 2018 and 2017, principal amount 25.0 billion yen)		234			220
Capitalized lease obligations payable through 2025		20			22
Total notes payable		$	5,372		$	5,289

Amounts in the table above are reported net of debt issuance costs and issuance premiums or discounts, if applicable, that are being amortized over the life of the notes.

53

A summary of the Company's lines of credit as of March 31, 2018 follows:

Borrower	Type	Original Term	Expiration Date	Capacity	Amount Outstanding	Interest Rate on Borrowed Amount	Maturity Period	Commitment Fee	Business Purpose
Aflac Incorporated and Aflac	uncommitted bilateral	364 days	November 30, 2018	$100 million	$0 million	The rate quoted by the bank and agreed upon at the time of borrowing	Up to 3 months	None	General corporate purposes
Aflac Incorporated	unsecured revolving	3 years	March 31, 2019, or the date commitments are terminated pursuant to an event of default	100.0 billion yen	0.0 billion yen	A rate per annum equal to (a) Tokyo interbank market rate (TIBOR) plus, the alternative applicable TIBOR margin during the availability period from the closing date to the commitment termination date or (b) the TIBOR rate offered by the agent to major banks in yen for the applicable period plus, the applicable alternative TIBOR margin during the term out period	No later than March 31, 2019	.30% to .50%, depending on the Parent Company's debt ratings as of the date of determination	General corporate purposes, including a capital contingency plan for the operations of the Parent Company
Aflac Incorporated and Aflac	unsecured revolving	5 years	September 18, 2020, or the date commitments are terminated pursuant to an event of default(1)	55.0 billion yen, or the equivalent amount in U.S. dollars	0.0 billion yen	A rate per annum equal to, at the Company's option, either, (a) London Interbank Offered Rate (LIBOR) adjusted for certain costs or (b) a base rate determined by reference to the highest of (1) the federal funds rate plus 1/2 of 1%, (2) the rate of interest for such day announced by Mizuho Bank, Ltd. as its prime rate, or (3) the eurocurrency rate for an interest period of one month plus 1.00%, in each case plus an applicable margin	No later than September 18, 2020(1)	.085% to .225%, depending on the Parent Company's debt ratings as of the date of determination	General corporate purposes, including a capital contingency plan for the operations of the Parent Company
Aflac Incorporated and Aflac	uncommitted bilateral	None specified	None specified	$50 million	$0 million	A rate per annum equal to, at the Parent Company's option, either (a) a eurocurrency rate determined by reference to the agent's LIBOR for the interest period relevant to such borrowing or (b) the base rate determined by reference to the greater of (i) the prime rate as determined by the agent, and (ii) the sum of 0.50% and the federal funds rate for such day	Up to 3 months	None	General corporate purposes
Aflac(2)	uncommitted revolving	364 days	November 30, 2018	$250 million	$0 million	USD three-month LIBOR plus 75 basis points per annum	3 months	None	General corporate purposes
Aflac Incorporated(2)	uncommitted revolving	364 days	April 2, 2018	37.5 billion yen	0.0 billion yen	Three-month TIBOR plus 80 basis points per annum	3 months	None	General corporate purposes

⁽¹⁾ Expiration and maturity period dates were updated in April 2018 to April 4, 2023

⁽²⁾Intercompany credit agreement

The Company was in compliance with all of the covenants of its notes payable and lines of credit at March 31, 2018. No events of default or defaults occurred during the three-month period ended March 31, 2018.

For additional information, see Notes 4 and 9 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

54

9. INCOME TAXES

For the United States, the Tax Cuts and Jobs Act (Tax Act) was signed into law on December 22, 2017. Effective January 1, 2018, the Tax Act imposes a broad number of changes in tax law, including the permanent reduction of the U.S. federal statutory corporate income tax rate from 35% to 21%.

The Company expects to complete its accounting for the effects of the Tax Act over the measurement period of up to one year from the enactment date, as permitted by SEC Staff Accounting Bulletin No. 118 (SAB 118). As of the enactment date, the Company estimated provisional amounts for its deferred taxes, including related valuation allowance, resulting in a reduction of its deferred tax assets (DTAs) by approximately $1.0 billion and its deferred tax liabilities (DTLs) by $2.9 billion, for a net DTL reduction of approximately $1.9 billion. The Company believes that these amounts represent reasonable estimates in accordance with SAB 118. The provisions of ASC 740-10, Income Taxes, require that the effects of changes in tax law on deferred taxes be recognized as a component of the income tax provision in the period the tax rate change was enacted. Therefore, the $1.9 billion provisional amount of net DTL reduction was recorded in the fourth quarter of 2017 as a reduction in the “Income tax expense, Deferred” line item of the Company’s consolidated statement of earnings. As of the first quarter of 2018, the Company has no update to this estimated benefit.

The following includes an overview of the existing current and deferred balances for which calculation of income tax effects of the Tax Act has not been completed:

Japan deferred tax balances: The Tax Act reduces the U.S. tax rate to 21%, effective January 1, 2018. Prior to the reduction in rate, the Japan deferred tax balances were completely offset by an anticipatory foreign tax credit. As a result of the rate reduction, the Japan deferred tax balance will no longer be offset by an anticipatory foreign tax credit as all of the foreign tax credits will be used to offset the U.S. deferred tax balance of the Aflac Japan branch.

The Company has not yet completed its analysis of the components of the Japan tax computation, including a complete validation of the Aflac Japan tax basis. Additional time is needed to collect, analyze, and validate the detailed data underlying the deferred tax amounts in the Aflac Japan branch. As of the fourth quarter of 2017, the Company had recorded a provisional amount of $4.5 billion of net DTL related to this item.

Valuation allowances: The Company must assess whether its valuation allowance analyses are impacted by various aspects of the Tax Act with a primary focus on any unused anticipatory foreign tax credits. As the Company has recorded provisional amounts related to the Japan deferred tax balances, any corresponding determination of the need for or change in a valuation allowance is also provisional. As of the fourth quarter of 2017, the Company had recorded a provisional valuation allowance of $.7 billion against its anticipatory foreign tax credit asset.

The impact of the Tax Act may differ, possibly materially, from the recorded provisional amounts.

10. SHAREHOLDERS’ EQUITY

See Note 1 for a discussion of the stock split that occurred in March 2018. All share and per-share amounts have been adjusted to reflect the stock split for any of the periods presented.

The following table is a reconciliation of the number of shares of the Company's common stock for the three-month periods ended March 31.

55

(In thousands of shares)	2018		2017
Common stock - issued:
Balance, beginning of period	1,345,762		1,342,498
Exercise of stock options and issuance of restricted shares	1,014		868
Balance, end of period	1,346,776		1,343,366
Treasury stock:
Balance, beginning of period	564,852		530,877
Purchases of treasury stock:
Open market	6,640		16,986
Other	315		288
Dispositions of treasury stock:
Shares issued to AFL Stock Plan	(384	)	(494	)
Exercise of stock options	(305	)	(256	)
Other	(99	)	(40	)
Balance, end of period	571,019		547,361
Shares outstanding, end of period	775,757		796,005

Outstanding share-based awards are excluded from the calculation of weighted-average shares used in the computation of basic earnings per share (EPS). The following table presents the approximate number of share-based awards to purchase shares, on a weighted-average basis, that were considered to be anti-dilutive and were excluded from the calculation of diluted earnings per share for the following periods.

	Three Months Ended March 31,
(In thousands)	2018		2017
Anti-dilutive share-based awards		9		642

Share Repurchase Program

During the first three months of 2018, the Company repurchased 6.6 million shares of its common stock in the open market for $296 million as part of its share repurchase program. During the first three months of 2017, the Company repurchased 17.0 million shares of its common stock in the open market for $600 million as part of its share repurchase program. In August 2017, the Company's board of directors authorized the purchase of an additional 80 million shares of its common stock. As of March 31, 2018, a remaining balance of 91.4 million shares of the Company's common stock was available for purchase under share repurchase authorizations by its board of directors.

56

Reclassifications from Accumulated Other Comprehensive Income

The tables below are reconciliations of accumulated other comprehensive income by component for the following periods.

Changes in Accumulated Other Comprehensive Income

Three Months Ended March 31, 2018
(In millions)	Unrealized Foreign Currency Translation Gains (Losses)				Unrealized Gains (Losses) on Investment Securities					Unrealized Gains (Losses) on Derivatives				Pension Liability Adjustment				Total
Balance, beginning of period		$	(1,750	)		$	5,964				$	(23	)		$	(163	)		$	4,028
Other comprehensive income (loss) before reclassification		447				(983		)			2				(37		)		(571		)
Amounts reclassified from accumulated other comprehensive income (loss)		0				225			(1)		0				3				228
Net current-period other comprehensive income (loss)		447				(758		)			2				(34		)		(343		)
Balance, end of period		$	(1,303	)		$	5,206				$	(21	)		$	(197	)		$	3,685

⁽¹⁾ Includes amounts reclassified due to changes in accounting principles of $(148) related to financial instruments and $374 related to tax effects from tax reform

All amounts in the table above are net of tax.

Three Months Ended March 31, 2017
(In millions)	Unrealized Foreign Currency Translation Gains (Losses)				Unrealized Gains (Losses) on Investment Securities				Unrealized Gains (Losses) on Derivatives				Pension Liability Adjustment				Total
Balance, beginning of period		$	(1,983	)		$	4,805			$	(24	)		$	(168	)		$	2,630
Other comprehensive income (loss) before reclassification		333				(341		)		2				(4		)		(10		)
Amounts reclassified from accumulated other comprehensive income (loss)		0				10				0				2				12
Net current-period other comprehensive income (loss)		333				(331		)		2				(2		)		2
Balance, end of period		$	(1,650	)		$	4,474			$	(22	)		$	(170	)		$	2,632

All amounts in the table above are net of tax.

For the three-month period ended March 31, 2018, see Note 1 for discussion of the amounts reclassified between AOCI and retained earnings upon the adoption of new accounting pronouncements.

57

The tables below summarize the amounts reclassified from each component of accumulated other comprehensive income into net earnings for the following periods.

Reclassifications Out of Accumulated Other Comprehensive Income

(In millions)	Three Months Ended March 31, 2018
Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income				Affected Line Item in the Statements of Earnings
Unrealized gains (losses) on available-for-sale securities		$	2		Sales and redemptions
		0			Other-than-temporary impairment losses realized
		2			Total before tax
		(1		)	Tax (expense) or benefit(1)
		$	1		Net of tax
Amortization of defined benefit pension items:
Actuarial gains (losses)		$	(4	)	Acquisition and operating expenses(2)
Prior service (cost) credit		0			Acquisition and operating expenses(2)
		1			Tax (expense) or benefit(1)
		$	(3	)	Net of tax
Total reclassifications for the period		$	(2	)	Net of tax

⁽¹⁾ Based on 27% blended tax rate

⁽²⁾ These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 12 for additional details).

(In millions)	Three Months Ended March 31, 2017
Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income				Affected Line Item in the Statements of Earnings
Unrealized gains (losses) on available-for-sale securities		$	(6	)	Sales and redemptions
		(10		)	Other-than-temporary impairment losses realized
		(16		)	Total before tax
		6			Tax (expense) or benefit(1)
		$	(10	)	Net of tax
Amortization of defined benefit pension items:
Actuarial gains (losses)		$	(3	)	Acquisition and operating expenses(2)
Prior service (cost) credit		0			Acquisition and operating expenses(2)
		1			Tax (expense) or benefit(1)
		$	(2	)	Net of tax
Total reclassifications for the period		$	(12	)	Net of tax

⁽¹⁾ Based on 35% tax rate

⁽²⁾ These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 12 for additional details)

11.    SHARE-BASED COMPENSATION

See Note 1 for a discussion of the stock split that occurred in March 2018. All share and per-share amounts have been adjusted to reflect the stock split for any of the periods presented.

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As of March 31, 2018, the Company has outstanding share-based awards under the Aflac Incorporated Long-Term Incentive Plan (the “Plan”). Share-based awards are designed to reward employees for their long-term contributions to the Company and provide incentives for them to remain with the Company. The number and frequency of share-based awards are based on competitive practices, operating results of the Company, government regulations, and other factors.

The Plan, as amended on February 14, 2017, allows for a maximum number of shares issuable over its term of 75 million shares including 38 million shares that may be awarded in respect of awards other than options or stock appreciation rights. If any awards granted under the Plan are forfeited or are terminated before being exercised or settled for any reason other than tax forfeiture, then the shares underlying the awards will again be available under the Plan.

The Plan allows awards to Company employees for incentive stock options (ISOs), non-qualifying stock options (NQSOs), restricted stock, restricted stock units, and stock appreciation rights. Non-employee directors are eligible for grants of NQSOs, restricted stock, and stock appreciation rights. As of March 31, 2018, approximately 40.5 million shares were available for future grants under this plan. The ISOs and NQSOs have a term of 10 years, and the share-based awards generally vest upon time-based conditions or time and performance-based conditions. Time-based vesting generally occurs after three years. Performance-based vesting conditions generally include the attainment of goals related to Company financial performance. As of March 31, 2018, the only performance-based awards issued and outstanding were restricted stock awards.

Stock options and stock appreciation rights granted under the amended Plan have an exercise price of at least the fair market value of the underlying stock on the grant date and have an expiration date no later than 10 years from the grant date. Time-based restricted stock awards, restricted stock units and stock options granted after January 1, 2017 generally vest on a ratable basis over three years, and awards granted prior to the amendment vest on a three-year cliff basis. The Compensation Committee of the Board of Directors has the discretion to determine vesting schedules.

Share-based awards granted to U.S.-based grantees are settled with authorized but unissued Company stock, while those issued to Japan-based grantees are settled with treasury shares.

The following table provides information on stock options outstanding and exercisable at March 31, 2018.

	Stock Option Shares (in thousands)		Weighted-Average Remaining Term (in years)		Aggregate Intrinsic Value (in millions)			Weighted-Average Exercise Price Per Share
Outstanding		6,306		5.5		$	99		$	28.03
Exercisable		4,439		4.4		77			26.45

The Company received cash from the exercise of stock options in the amount of $23 million during the first three months of 2018, compared with $17 million in the first three months of 2017. The tax benefit realized as a result of stock option exercises and restricted stock releases was $12 million in the first three months of 2018, compared with $14 million in the first three months of 2017.

As of March 31, 2018, total compensation cost not yet recognized in the Company's financial statements related to restricted stock awards was $62 million, of which $30 million (826 thousand shares) was related to restricted stock awards with a performance-based vesting condition. The Company expects to recognize these amounts over a weighted-average period of approximately 1.5 years. There are no other contractual terms covering restricted stock awards once vested.

The following table summarizes restricted stock activity during the three-month period ended March 31.

(In thousands of shares)	Shares		Weighted-Average Grant-Date Fair Value Per Share
Restricted stock at December 31, 2017	3,635			$	32.40
Granted in 2018	918			44.12
Canceled in 2018	(56	)		33.18
Vested in 2018	(980	)		31.50
Restricted stock at March 31, 2018	3,517			$	35.70

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In February 2018, the Company granted 432 thousand performance-based stock awards, which are contingent on the achievement of the Company's financial performance metrics and its market-based conditions. On the date of grant, the Company estimated the fair value of restricted stock awards with market-based conditions using a Monte Carlo simulation model. The model discounts the value of the stock at the assumed vesting date based on the risk-free interest rate. Based on estimates of actual performance versus the vesting thresholds, the calculated fair value percentage pay-out estimate will be updated each quarter.

The Company uses third-party analyses to assist in developing the assumptions used in, as well as calibrating, a Monte Carlo simulation model. The Company is responsible for determining the assumptions used in estimating the fair value of its share-based payment awards.

For additional information on the Company's long-term share-based compensation plans and the types of share-based awards, see Note 12 of the Notes to the Consolidated Financial Statements included in the 2017 Annual Report.

12. BENEFIT PLANS

The Company has funded defined benefit plans in Japan and the United States, however the U.S. plan was frozen to new participants effective October 1, 2013. The Company also maintains non-qualified, unfunded supplemental retirement plans that provide defined pension benefits in excess of limits imposed by federal tax law for certain Japanese, U.S. and former employees, however the U.S. plan was frozen to new participants effective January 1, 2015. U.S. employees who are not participants in the defined benefit plan receive a nonelective 401(k) employer contribution.

The Company provides certain health care benefits for eligible U.S. retired employees, their beneficiaries and covered dependents ("other postretirement benefits"). The health care plan is contributory and unfunded. Effective January 1, 2014, employees eligible for benefits included the following: (1) active employees whose age plus service, in years, equaled or exceeded 80 (rule of 80); (2) active employees who were age 55 or older and have met the 15 years of service requirement; (3) active employees who would meet the rule of 80 in the next five years; (4) active employees who were age 55 or older and who would meet the 15 years of service requirement within the next five years; and (5) current retirees. For certain employees and former employees, additional coverage is provided for all medical expenses for life.

Pension and other postretirement benefit expenses are included in acquisition and operating expenses in the consolidated statement of earnings, which includes $5 million of other components of net periodic pension cost and postretirement costs (other than service costs) for the three months ended March 31, 2018 and 2017, respectively. Total net periodic cost includes the following components:

	Three Months Ended March 31,
	Pension Benefits																Other
	Japan								U.S.								Postretirement Benefits
(In millions)	2018				2017				2018				2017				2018			2017
Components of net periodic benefit cost:
Service cost		$	5			$	5			$	7			$	6			$	0		$	0
Interest cost		2				1				9				8				0			0
Expected return on plan assets		(2		)		(1		)		(7		)		(6		)		0			0
Amortization of net actuarial loss		0				0				4				3				0			0
Amortization of prior service cost (credit)		0				0				0				0				0			0
Net periodic (benefit) cost		$	5			$	5			$	13			$	11			$	0		$	0

During the three months ended March 31, 2018, Aflac Japan contributed approximately $6 million (using the weighted-average yen/dollar exchange rate for the three-month period ending March 31, 2018) to the Japanese funded defined benefit plan, and Aflac U.S. contributed $10 million to the U.S. funded defined benefit plan.

As a result of U.S. tax reform legislation enacted in December 2017, the Company announced it would make a one-time contribution of $500 to the U.S. 401(k) plan to all employees active on December 31, 2017. This contribution was

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made by January 31, 2018. The Company also announced that it would increase its matching contributions to 100% of each employee's contributions which were not in excess of 4% of the employee's annual cash compensation. This increase became effective on January 1, 2018.

For additional information regarding the Company's Japanese and U.S. benefit plans, see Note 14 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

13. COMMITMENTS AND CONTINGENT LIABILITIES

The Company is a defendant in various lawsuits considered to be in the normal course of business. Members of the Company's senior legal and financial management teams review litigation on a quarterly and annual basis. The final results of any litigation cannot be predicted with certainty. Although some of this litigation is pending in states where large punitive damages, bearing little relation to the actual damages sustained by plaintiffs, have been awarded in recent years, the Company believes the outcome of pending litigation will not have a material adverse effect on its financial position, results of operations, or cash flows.

See Note 3 of the Notes to the Consolidated Financial Statements for details on investment commitments.

Guaranty Fund Assessments

The United States insurance industry has a policyholder protection system that is monitored and regulated by state insurance departments. These life and health insurance guaranty associations are state entities (in all 50 states as well as Puerto Rico and the District of Columbia) created to protect policyholders of an insolvent insurance company. All insurance companies (with limited exceptions) licensed to sell life or health insurance in a state must be members of that state’s guaranty association. Under state guaranty association laws, certain insurance companies can be assessed (up to prescribed limits) for certain obligations to the policyholders and claimants of impaired or insolvent insurance companies that write the same line or similar lines of business.

In 2009, the Pennsylvania Insurance Commissioner placed long-term care insurer Penn Treaty Network America Insurance Company and its subsidiary American Network Insurance Company (collectively referred to as Penn Treaty), neither of which is affiliated with Aflac, in rehabilitation and petitioned a state court for approval to liquidate Penn Treaty. A final order of liquidation was granted by a recognized judicial authority on March 1, 2017, and as a result, Penn Treaty is in the process of liquidation. The Company estimated and recognized the impact of its share of guaranty fund assessments resulting from the liquidation using a discounted rate of 4.25%. The Company recognized a discounted liability for the assessments of $62 million (undiscounted $94 million), offset by discounted premium tax credits of $48 million (undiscounted $74 million), for a net $14 million impact to net income in the quarter ended March 31, 2017. The Company paid a majority of these assessments by March 31, 2018, and a majority of the tax credits will be realized over the next four years. The Company used the cost estimate provided as of the liquidation date by the National Organization of Life and Health Guaranty Associations (NOLHGA) to calculate its estimated assessments and tax credits.

Guaranty fund assessments for the three-month period ended March 31, 2018 were immaterial.

14. SUBSEQUENT EVENTS

On April 1, 2018, the Company completed the conversion of Aflac Japan from a branch structure to a legal subsidiary. The treatment of Aflac Japan as a branch for U.S. tax purposes did not change following the completion of this conversion.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

FORWARD-LOOKING INFORMATION

The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” to encourage companies to provide prospective information, so long as those informational statements are identified as forward-looking and are accompanied by meaningful cautionary statements identifying important factors that could cause actual results to differ materially from those included in the forward-looking statements. The Company desires to take advantage of these provisions. This report contains cautionary statements identifying important factors that could cause actual results to differ materially from those projected herein, and in any other statements made by Company officials in communications with the financial community and contained in documents filed with the Securities and Exchange Commission (SEC). Forward-looking statements are not based on historical information and relate to future operations, strategies, financial results or other developments. Furthermore, forward-looking information is subject to numerous assumptions, risks and uncertainties. In particular, statements containing words such as “expect,” “anticipate,” “believe,” “goal,” “objective,” “may,” “should,” “estimate,” “intends,” “projects,” “will,” “assumes,” “potential,” “target,” "outlook" or similar words as well as specific projections of future results, generally qualify as forward-looking. Aflac undertakes no obligation to update such forward-looking statements.

The Company cautions readers that the following factors, in addition to other factors mentioned from time to time, could cause actual results to differ materially from those contemplated by the forward-looking statements:

• difficult conditions in global capital markets and the economy

• exposure to significant interest rate risk

• concentration of business in Japan

• foreign currency fluctuations in the yen/dollar exchange rate

• failure to implement the conversion of the Japan branch to a legal subsidiary

• limited availability of acceptable yen-denominated investments

• deviations in actual experience from pricing and reserving assumptions

• ability to continue to develop and implement improvements in information technology systems

• governmental actions for the purpose of stabilizing the financial markets

• interruption in telecommunication, information technology and other operational systems, or a failure to maintain the security, confidentiality or privacy of sensitive data residing on such systems

• ongoing changes in the Company's industry

• failure to comply with restrictions on patient privacy and information security

• extensive regulation and changes in law or regulation by governmental authorities

• tax rates applicable to the Company may change

• defaults and credit downgrades of investments

• ability to attract and retain qualified sales associates, brokers, employees and distribution partners

• decline in creditworthiness of other financial institutions

• subsidiaries' ability to pay dividends to Aflac Incorporated

• decreases in the Company's financial strength or debt ratings

• inherent limitations to risk management policies and procedures

• concentration of the Company's investments in any particular single-issuer or sector

• differing judgments applied to investment valuations

• ability to effectively manage key executive succession

• significant valuation judgments in determination of amount of impairments taken on the Company's investments

• catastrophic events including, but not necessarily limited to, epidemics, pandemics, tornadoes, hurricanes, earthquakes, tsunamis, war or other military action, terrorism or other acts of violence, and damage incidental to such events

• changes in U.S. and/or Japanese accounting standards

• loss of consumer trust resulting from events external to the Company's operations

• increased expenses and reduced profitability resulting from changes in assumptions for pension and other postretirement benefit plans

• level and outcome of litigation

• failure of internal controls or corporate governance policies and procedures

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MD&A OVERVIEW

Management’s Discussion and Analysis of Financial Condition and Results of Operations (MD&A) is intended to inform the reader about matters affecting the financial condition and results of operations of Aflac Incorporated and its subsidiaries for the three-month periods ended March 31, 2018 and 2017, respectively. Results of operations for interim periods are not necessarily indicative of results for the entire year. As a result, the following discussion should be read in conjunction with the consolidated financial statements and notes that are included in the Company's annual report on Form 10-K for the year ended December 31, 2017 (2017 Annual Report). This MD&A is divided into the following sections:

• The Company's Business

• Performance Highlights

• Critical Accounting Estimates

• Results of Operations, consolidated and by segment

• Analysis of Financial Condition

• Capital Resources and Liquidity

THE COMPANY'S BUSINESS

Aflac Incorporated (the Parent Company) and its subsidiaries (collectively, the Company) primarily sell supplemental health and life insurance in the United States and Japan. The Company's insurance business is marketed and administered through American Family Life Assurance Company of Columbus (Aflac) in the United States (Aflac U.S.) and as a branch in Japan (Aflac Japan). The conversion of Aflac Japan from a branch to a legal subsidiary was completed on April 1, 2018, after which date the Company's insurance business is marketed and administered through American Family Life Assurance Company of Columbus (Aflac) in the United States (Aflac U.S.) and through Aflac Life Insurance Japan Ltd. in Japan (Aflac Japan). (For more information about the conversion of Aflac Japan to a legal subsidiary, see the Insurance Operations subsection of this MD&A). American Family Life Assurance Company of New York (Aflac New York) is a wholly owned subsidiary of Aflac. Most of Aflac’s policies are individually underwritten and marketed through independent agents. Additionally, Aflac U.S. markets and administers group products through Continental American Insurance Company (CAIC), branded as Aflac Group Insurance. The Company's insurance operations in the United States and Japan service the two markets for its insurance business.

PERFORMANCE HIGHLIGHTS

Yen-denominated income statement accounts are translated to U.S. dollars using a weighted-average Japanese yen/U.S. dollar foreign exchange rate, while yen-denominated balance sheet accounts are translated to U.S. dollars using a spot Japanese yen/U.S. dollar foreign exchange rate. The spot yen/dollar exchange rate at March 31, 2018 was 106.24, or 6.4%stronger than the spot yen/dollar exchange rate of 113.00 at December 31, 2017. The weighted-average yen/dollar exchange rate for the three-month period ended March 31, 2018 was 108.05, or 5.1%stronger than the weighted-average yen/dollar exchange rate of 113.56 for the same period in 2017.

Total revenues were $5.5 billion in the first quarter of 2018, compared with $5.3 billion in the first quarter of 2017. Net earnings were $717 million, or $.91 per diluted share in the first quarter of 2018, compared with $592 million, or $.73 per diluted share, in the first quarter of 2017.

Results in the firstquarter of 2018 included pretax net realized investment losses of $134 million, compared with net realized investment losses of $140 million in the firstquarter of 2017. Net investment losses in the firstquarter of 2018 included $7 million of other-than-temporary impairment losses and changes in loan loss reserves. Effective January 1, 2018 upon the adoption of new accounting guidance, changes in fair value of equity securities are recorded in earnings as a component of realized investment gains and losses. The Company reported net losses on equity securities of $46 million in the first quarter of 2018.

On February 13, 2018, the Board of Directors of the Parent Company declared a two-for-one stock split of the

Company’s common stock in the form of a 100% stock dividend payable on March 16, 2018 to shareholders of record at

the close of business on March 2, 2018. The stock split was paid in the form of one additional common stock share

for every share of common stock held. All equity and share-based data, including the number of shares outstanding and per share amounts, have been adjusted to reflect the stock split for all periods presented in this report.

In the first three months of 2018, the Company repurchased 6.6 million shares of its common stock in the open market for $296 million under its share repurchase program.

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CRITICAL ACCOUNTING ESTIMATES

The Company prepares its financial statements in accordance with U.S. generally accepted accounting principles (GAAP). These principles are established primarily by the Financial Accounting Standards Board (FASB). In this MD&A, references to U.S. GAAP issued by the FASB are derived from the FASB Accounting Standards Codification^™ (ASC). The preparation of financial statements in conformity with U.S. GAAP requires the Company to make estimates based on currently available information when recording transactions resulting from business operations. The estimates that the Company deems to be most critical to an understanding of Aflac’s results of operations and financial condition are those related to the valuation of investments and derivatives, deferred policy acquisition costs (DAC), liabilities for future policy benefits and unpaid policy claims, and income taxes. The preparation and evaluation of these critical accounting estimates involve the use of various assumptions developed from management’s analyses and judgments. The application of these critical accounting estimates determines the values at which 94% of the Company's assets and 78% of its liabilities are reported as of March 31, 2018, and thus has a direct effect on net earnings and shareholders’ equity. Subsequent experience or use of other assumptions could produce significantly different results.

There have been no changes in the items that the Company has identified as critical accounting estimates during the three months ended March 31, 2018. For additional information, see the Critical Accounting Estimates section of MD&A included in the 2017 Annual Report.

New Accounting Pronouncements

For information on new accounting pronouncements and the impact, if any, on the Company's financial position or results of operations, see Note 1 of the Notes to the Consolidated Financial Statements.

RESULTS OF OPERATIONS

The following discussion includes references to the Company's performance measures, adjusted earnings, adjusted earnings per diluted share, and amortized hedge costs, which are not calculated in accordance with U.S. GAAP. These measures exclude items that the Company believes may obscure the underlying fundamentals and trends in the Company's insurance operations because they tend to be driven by general economic conditions and events or related to infrequent activities not directly associated with its insurance operations. The Company's management uses adjusted earnings and adjusted earnings per diluted share to evaluate the financial performance of its insurance operations on a consolidated basis, and the Company believes that a presentation of these measures is vitally important to an understanding of its underlying profitability drivers and trends of its insurance business. The Company believes that amortized hedge costs, which are a component of adjusted earnings, measure the periodic currency risk management costs associated with hedging a portion of Aflac Japan’s U.S. dollar-denominated investments and are an important component of net investment income.

Beginning with the first quarter of 2018, the Company began utilizing the term “adjusted earnings” for the measure formerly referred to as "operating earnings" on both a pretax and after-tax basis, as well as an absolute and per-share basis. This change only pertained to the label of the measure and did not alter its definition or calculation.

Aflac defines adjusted earnings (a non-U.S. GAAP financial measure) as the profits derived from operations. The most comparative U.S. GAAP measure is net earnings. Adjusted earnings are adjusted revenues less benefits and adjusted expenses. The adjustments to both revenues and expenses account for certain items that cannot be predicted or that are outside management’s control. Adjusted revenues are U.S. GAAP total revenues excluding realized investment gains and losses, except for amortized hedge costs related to foreign currency denominated investments. Adjusted expenses are U.S. GAAP total acquisition and operating expenses including the impact of interest cash flows from derivatives associated with notes payable but excluding any nonrecurring or other items not associated with the normal course of the Company’s insurance operations and that do not reflect Aflac’s underlying business performance.

The Company defines adjusted earnings per share (basic or diluted) to be adjusted earnings for the period divided by the weighted average outstanding shares (basic or diluted) for the period presented. The most comparable U.S. GAAP measure is net earnings per share.

Amortized hedge costs represent costs incurred in using foreign currency forward contracts to hedge the foreign exchange risk of a portion of U.S. dollar-denominated assets in the Company’s Japan segment investment portfolio. These amortized hedge costs are derived from the difference between the foreign currency spot rate at time of trade inception and the contractual foreign currency forward rate, recognized on a straight line basis over the term of the hedge. There is no comparable U.S. GAAP financial measure for amortized hedge costs.

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Because a significant portion of the Company's business is conducted in Japan and foreign exchange rates are outside of management’s control, the Company believes it is important to understand the impact of translating Japanese yen into U.S. dollars. Adjusted earnings and adjusted earnings per diluted share excluding current period foreign currency impact are computed using the average yen/dollar exchange rate for the comparable prior year period, which eliminates dollar based fluctuations driven solely from currency rate changes.

The following table is a reconciliation of items impacting adjusted earnings and adjusted earnings per diluted share to the most directly comparable U.S. GAAP measures of net earnings and net earnings per diluted share, respectively.

Reconciliation of Net Earnings to Adjusted Earnings⁽¹⁾ 

	In Millions						Per Diluted Share
	Three Months Ended March 31,
	2018			2017			2018			2017
Net earnings	$	717		$	592		$	.91		$	.73
Items impacting net earnings:
Realized investment (gains) losses (2),(3),(4)	98			109			.13			.14
Other and non-recurring (income) loss	29			20			.04			.02
Income tax (benefit) expense on items excluded from adjusted earnings	(24		)	(45		)	(.03		)	(.05		)
Adjusted earnings	821			676			1.05			.84
Current period foreign currency impact (5)	(21		)	N/A			(.03		)	N/A
Adjusted earnings excluding current period foreign currency impact (6)	$	800		$	676		$	1.02		$	.84

⁽¹⁾ "Adjusted earnings" was formerly referred to as "operating earnings." Amounts may not foot due to rounding.

⁽²⁾ Excludes amortized hedge costs of $55 and $52 for the three-month periods ended March 31, 2018, and 2017, respectively, related to hedging U.S. dollar-denominated investments held in Aflac Japan which are classified as a component of adjusted earnings to conform to current year reporting. See "Hedge Costs" discussion below for further information.

⁽³⁾ Amortized hedge costs in Aflac Japan were offset by derivatives entered into as part of corporate activities and resulted in a benefit of $2 for the three-month period ended March 31, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in net investment income when analyzing operations.

⁽⁴⁾ Excludes a gain of $17 and $21 for the three-month periods ended March 31, 2018 and 2017, respectively, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable which is classified as an operating gain when analyzing segment operations

⁽⁵⁾ Prior period foreign currency impact reflected as “N/A” to isolate change for current period only.

⁽⁶⁾ Amounts excluding current period foreign currency impact are computed using the average yen/dollar exchange rate for the comparable prior-year period, which eliminates dollar-based fluctuations driven solely from currency rate changes.

Realized Investment Gains and Losses

The Company's investment strategy is to invest primarily in fixed maturity securities to provide a reliable stream of investment income, which is one of the drivers of the Company’s growth and profitability. This investment strategy incorporates asset-liability matching (ALM) to align the expected cash flows of the portfolio to the needs of the Company's liability structure. The Company does not purchase securities with the intent of generating capital gains or losses. However, investment gains and losses may be realized as a result of changes in the financial markets and the creditworthiness of specific issuers, tax planning strategies, and/or general portfolio management and rebalancing. The realization of investment gains and losses is independent of the underwriting and administration of the Company's insurance products. Realized investment gains and losses include securities transactions, impairments, changes in loan loss reserves, and derivative and foreign currency activities. Effective January 1, 2018, changes in fair value of equity securities are also included in earnings as a component of realized investment gains and losses.

Securities Transactions, Impairments, and Gains (Losses) on Equity Securities

Securities transactions include gains and losses from sales and redemptions of investments where the amount received is different from the amortized cost of the investment. Impairments include other-than-temporary-impairment losses on investment securities as well as changes in loan loss reserves for loan receivables. Starting in the first quarter of 2018, gains and losses from changes in fair value of equity securities are recorded in earnings.

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Certain Derivative and Foreign Currency Gains (Losses)

The Company's derivative activities include foreign currency forwards and options on certain fixed maturity securities; foreign currency forwards and options that economically hedge certain portions of forecasted cash flows denominated in yen; foreign currency swaps associated with certain senior notes and subordinated debentures; and foreign currency swaps and credit defaults swaps held in consolidated variable interest entities (VIEs). Gains and losses are recognized as a result of valuing these derivatives, net of the effects of hedge accounting. The Company also excludes the accounting impacts of remeasurement associated with changes in the yen/dollar exchange rate from adjusted earnings. Certain derivative and foreign currency gains (losses) exclude amortized hedge costs (see Hedge Cost section below) and the interest rate component of the change in fair value of foreign currency swaps on notes payable that are both included in adjusted earnings.

Hedge Costs

Effective January 1, 2017, adjusted earnings includes the impact of amortized hedge costs. Amortized hedge costs represent costs incurred in using foreign currency forward contracts to hedge the foreign exchange risk of a portion of U.S. dollar-denominated assets in the Company's Japan segment investment portfolio. These amortized hedge costs are derived from the difference between the foreign currency spot rate at time of trade inception and the contractual foreign currency forward rate, recognized on a straight line basis over the term of the hedge. There is no comparable U.S. GAAP financial measure for amortized hedge costs.

Hedge costs can fluctuate based upon many factors, including the derivative notional amount, the length of time of the derivative contract, changes in both U.S. and Japan interest rates, and supply and demand for dollar funding. Hedge costs have increased in recent periods due to changes in the previously mentioned factors. In late 2017, the Company

took steps to mitigate rising hedge costs by increasing the amount of unhedged U.S. dollar-denominated investments held

in Aflac Japan and to reduce hedge cost volatility by extending hedge duration. For additional information regarding

currency hedging, refer to Hedging Activities in the Analysis of Financial Condition section of this MD&A.

For additional information regarding realized investment gains and losses, including details of reported amounts for the periods presented, see Notes 3 and 4 of the Notes to the Consolidated Financial Statements.

Other and Non-recurring Items

The United States insurance industry has a policyholder protection system that provides funds for the policyholders of insolvent insurers. The system can result in periodic charges to the Company as a result of insolvencies/bankruptcies that occur with other companies in the life insurance industry. Some states permit member insurers to recover assessments paid through full or partial premium tax offsets. These charges neither relate to the ordinary course of the Company’s business nor reflect the Company’s underlying business performance, but result from external situations not controlled by the Company.

Based on the underlying nature of these assessments, effective January 1, 2017, the Company adopted a policy of excluding any charges associated with U.S. guaranty fund assessments and the corresponding tax benefit or expense from adjusted earnings.

For the Penn Treaty liquidation that was recognized by judicial authority in March 2017, the Company estimated and recognized a discounted liability for assessments of $62 million (undiscounted $94 million), offset by discounted premium tax credits of $48 million (undiscounted $74 million), for a net $14 million impact to net income in the quarter ended March 31, 2017. For additional information regarding guaranty fund assessments, see Note 13 of the Notes to the Consolidated Financial Statements.

Effective January 1, 2017, nonrecurring items also include conversion costs related to legally converting the Company's Japan business to a subsidiary; these costs primarily consist of expenditures for legal, accounting, consulting, integration of systems and processes and other similar services. These Japan branch conversion costs amounted to $29 million and $6 million for the three-month periods ended March 31, 2018 and 2017, respectively.

Tax Reform Adjustment

Among other changes, the U.S. Tax Cuts and Job Act (Tax Act) reduced the U.S. federal statutory corporate income tax rate from 35% to 21% effective January 1, 2018. Because changes to tax rates are accounted for in the period of enactment, the Company recognized a non-recurring estimated $1.9 billion benefit in the three-month period and full year

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ended December 31, 2017. While the Company believes that this estimate is reasonable, it is relying upon guidance provided by SEC Staff Accounting Bulletin No. 118 that provides a measurement period of up to one year from the enactment date of December 22, 2017 in order for the Company to complete the accounting for the effects of the Tax Act.

The estimated impact of tax reform, which was included in U.S. GAAP net income, but excluded from adjusted earnings as defined, for the year ended December 31, 2017, and is included in equity as of March 31, 2018, is a preliminary estimate and may be adjusted for the current and future periods, possibly materially, due to, among other things, further refinement of the Company’s calculations, changes in interpretations and assumptions the Company has made, tax guidance that may be issued and actions the Company may take as a result of tax reform.

For further information about the impact of tax reform, see the Critical Accounting Estimates - Income Taxes section of MD&A and Note 10 in the Notes to the Consolidated Financial Statements in the 2017 Annual Report, and Note 9 of the Notes to the Consolidated Financial Statements in this report.

Foreign Currency Translation

Aflac Japan’s premiums and a significant portion of its investment income are received in yen, and its claims and most expenses are paid in yen. Aflac Japan purchases yen-denominated assets and U.S. dollar-denominated assets, which may be hedged to yen, to support yen-denominated policy liabilities. These and other yen-denominated financial statement items are, however, translated into dollars for financial reporting purposes. The Company translates Aflac Japan’s yen-denominated income statement into dollars using the average exchange rate for the reporting period, and the Company translates its yen-denominated balance sheet using the exchange rate at the end of the period.

Due to the size of Aflac Japan, whose functional currency is the Japanese yen, fluctuations in the yen/dollar exchange rate can have a significant effect on the Company's reported results. In periods when the yen weakens, translating yen into dollars results in fewer dollars being reported. When the yen strengthens, translating yen into dollars results in more dollars being reported. Consequently, yen weakening has the effect of suppressing current period results in relation to the comparable prior period, while yen strengthening has the effect of magnifying current period results in relation to the comparable prior period. Management evaluates the Company's financial performance both including and excluding the impact of foreign currency translation to monitor, respectively, cumulative currency impacts on book value and the currency-neutral operating performance over time.

Income Taxes

The Company's combined U.S. and Japanese effective income tax rate on pretax earnings was 27.0% for the three-month period ended March 31, 2018, compared with 34.1% for the same period in 2017. The reduction in the tax rate for the three-month period ended March 31, 2018 was primarily due to the decrease in the U.S. federal statutory corporate income tax rate from 35% to 21% effective January 1, 2018. The impact of the Tax Act, including the Company's combined U.S. and Japanese effective income tax rate, may be adjusted in future periods due to, among other things, further refinement of the Company's calculations, changes in interpretations and assumptions the Company has made, tax guidance that may be issued and actions the Company make take as a result of the Tax Act.

INSURANCE OPERATIONS

Aflac's insurance business consists of two segments: Aflac Japan and Aflac U.S. Aflac Japan is the principal contributor to consolidated earnings. Operating business segments that are not individually reportable and business activities, including reinsurance retrocession activities, not included in the Aflac Japan or Aflac U.S. are included in the "Corporate and other" category.

On December 2, 2016, the Company publicly announced that it would pursue the conversion of Aflac Japan from a branch structure to a subsidiary structure, with the subsidiary incorporated as a “Kabushiki Kaisha,” or Japanese stock corporation. The conversion was completed on April 1, 2018. While the branch structure remains an acceptable legal form, the subsidiary structure has emerged as the more prevalent structure for both domestic and foreign companies operating in Japan. In addition, emerging global regulatory standards generally favor the subsidiary structure for foreign insurance and financial service companies. The adoption of this new organizational framework is expected to be tax-neutral and not to have a material impact on the daily operations of either Aflac Japan or Aflac U.S. as a result of this conversion. In addition, the Company expects to obtain enhanced flexibility in capital management and business development as a result of the conversion. Effective January 1, 2018, investments of Aflac U.S. as well as certain sub-advised assets of Aflac Japan, are managed by the Company’s U.S. asset management subsidiary, Aflac Asset Management LLC (AAM), and investments of Aflac Japan are managed pursuant to an investment advisory agreement

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between Aflac Japan and the Company's asset management subsidiary in Japan, Aflac Asset Management Japan Ltd. (AAMJ). AAMJ is licensed as a discretionary asset manager under the Japan Financial Instruments and Exchange Act and is subject to rules of the Japan Investment Advisors Association, a self-regulatory organization with mandatory membership for Japan investment managers. Beginning with the first quarter of 2018, AAM and AAMJ are reported in the "Other business segments" category; however, the assets that they manage will be reported in the respective Aflac Japan and Aflac U.S. business segments. Effective April 1, 2018, Aflac Life Insurance Japan Ltd., a Japanese stock corporation, has assumed the business of Aflac Japan. The Parent Company had also formed wholly-owned U.S. subsidiary Aflac Holdings LLC, which is the parent company of Aflac Life Insurance Japan Ltd.

U.S. GAAP financial reporting requires that a company report financial and descriptive information about operating

segments in its annual and interim period financial statements. Furthermore, the Company is required to report a measure

of segment profit or loss, certain revenue and expense items, and segment assets.

The Company evaluates its sales efforts using new annualized premium sales, an industry operating measure. New annualized premium sales, which include both new sales and the incremental increase in premiums due to conversions, generally represent the premiums that the Company would collect over a 12-month period, assuming the policies remain in force. For Aflac Japan, new annualized premium sales are determined by applications submitted during the reporting period. For Aflac U.S., new annualized premium sales are determined by applications that are issued during the reporting period. Premium income, or earned premiums, is a financial performance measure that reflects collected or due premiums that have been earned ratably on policies in force during the reporting period.

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AFLAC JAPAN SEGMENT

Aflac Japan Pretax Adjusted Earnings

Changes in Aflac Japan’s pretax adjusted earnings and profit margins are primarily affected by morbidity, mortality, expenses, persistency and investment yields. The following table presents a summary of operating results for Aflac Japan.

Aflac Japan Summary of Operating Results

	Three Months Ended March 31,
(In millions)	2018		2017
Net premium income	$	3,263	$	3,194
Net investment income:
Yen-denominated investment income	331		323
U.S. dollar-denominated investment income	312		286
Net investment income	643		609
Amortized hedge costs related to foreign currency denominated investments	55		52
Net investment income, less amortized hedge costs	588		557
Other income (loss)	12		10
Total adjusted revenues	3,863		3,761
Benefits and claims, net	2,294		2,288
Adjusted expenses:
Amortization of deferred policy acquisition costs	168		154
Insurance commissions	190		184
Insurance and other expenses	393		366
Total adjusted expenses	751		704
Total benefits and expenses	3,045		2,992
Pretax adjusted earnings(1)	$	818	$	769
Weighted-average yen/dollar exchange rate	108.05		113.56

	In Dollars				In Yen
Percentage change over  previous period:	Three Months Ended March 31,				Three Months Ended March 31,
	2018		2017		2018		2017
Net premium income	2.2	%	.5	%	(2.6	)%	(1.1	)%
Net investment income, less amortized hedge costs	5.6		(5.4	)	.0		(6.3	)
Total adjusted revenues	2.7		(.4	)	(2.2	)	(1.9	)
Pretax adjusted earnings(1)	6.4		(4.7	)	.9		(5.6	)

⁽¹⁾ Aflac defines pretax adjusted earnings (a non-U.S. GAAP financial measure) as adjusted earnings before the application of income taxes. See the Results of Operations section of this MD&A for the Company's definition of adjusted earnings.

In yen terms, Aflac Japan's net premium income decreased in the three-month period ended March 31, 2018, with growth in third sector premium more than offset by an anticipated reduction in first sector premium due to savings products reaching premium paid-up status. In dollar terms, net investment income, net of amortized hedge costs, increased largely due to higher-yielding U.S. dollar investments.

Annualized premiums in force decreased2.7% to 1.54 trillion yen as of March 31, 2018, compared with 1.59 trillion yen as of March 31, 2017. The decrease in annualized premiums in force in yen was driven primarily by limited-pay policies becoming paid-up during the year. Annualized premiums in force, translated into dollars at respective period-end exchange rates, were $14.5 billion at March 31, 2018, compared with $14.1 billion a year ago.

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Aflac Japan's investment portfolios include U.S. dollar-denominated securities and reverse-dual currency securities (yen-denominated debt securities with dollar coupon payments). In years when the yen strengthens in relation to the dollar, translating Aflac Japan's U.S. dollar-denominated investment income into yen lowers growth rates for net investment income, total adjusted revenues, and pretax adjusted earnings in yen terms. In years when the yen weakens, translating U.S. dollar-denominated investment income into yen magnifies growth rates for net investment income, total operating revenues, and pretax adjusted earnings in yen terms.

The following table illustrates the effect of translating Aflac Japan’s U.S. dollar-denominated investment income and related items into yen by comparing certain segment results with those that would have been reported had yen/dollar exchange rates remained unchanged from the comparable period in the prior year. In order to compare the current period to the prior period without the impact of foreign currency, the current period income statement is translated at the prior year's comparable period average exchange rate.

Aflac Japan Percentage Changes Over Previous Period

(Yen Operating Results)

For the Periods Ended March 31,

	Including Foreign Currency Changes						Excluding Foreign Currency Changes(2)
	Three Months						Three Months
	2018			2017			2018			2017
Net investment income, less amortized hedge costs	.0		%	(6.3	)	%	2.7		%	(5.5	)	%
Total adjusted revenues	(2.2	)		(1.9	)		(1.8	)		(1.8	)
Pretax adjusted earnings(1)	.9			(5.6	)		2.7			(5.1	)

⁽¹⁾ Aflac defines pretax adjusted earnings (a non-U.S. GAAP financial measure) as adjusted earnings before the application of income taxes. See the Results of Operations section of this MD&A for the Company's definition of adjusted earnings.

⁽²⁾ Amounts excluding foreign currency impact on U.S. dollar-denominated items (a non-U.S. GAAP measure) were determined using the same yen/dollar exchange rate for the current period as the comparable period in the prior year.

The following table presents a summary of operating ratios in yen terms for Aflac Japan.

	Three Months Ended March 31,
Ratios to total revenues:	2018		2017
Benefits and claims, net	59.4	%	60.8	%
Adjusted expenses:
Amortization of deferred policy acquisition costs	4.4		4.1
Insurance commissions	4.9		4.9
Insurance and other expenses	10.2		9.7
Total adjusted expenses	19.5		18.7
Pretax adjusted earnings(1)	21.1		20.5

⁽¹⁾ Aflac defines pretax adjusted earnings (a non-U.S. GAAP financial measure) as adjusted earnings before the application of income taxes. See the Results of Operations section of this MD&A for the Company's definition of adjusted earnings.

In the three-month period ended March 31, 2018, the benefit ratio decreased, compared with the same respective period in the prior year, primarily due to the change in mix of first and third sector business as first sector products become paid-up and a de-emphasis on sales of first sector savings products, as well as continued favorable claims experience.In the three-month period ended March 31, 2018, the operating expense ratio increased primarily due to lower premium income impacted by first sector products becoming paid-up, however expenses incurred remained consistent. In total, the pretax operating profit margin increased in the three-month period ended March 31, 2018, reflecting the decrease in the benefit ratio partially offset by a smaller increase in the expense ratio. For the full year of 2018, the Company anticipates the Aflac Japan pretax adjusted profit margin (calculated by dividing adjusted earnings by adjusted revenues) to remain stable.

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Aflac Japan Sales

The following table presents Aflac Japan’s new annualized premium sales for the periods ended March 31.

	In Dollars						In Yen
	Three Months						Three Months
(In millions of dollars and billions of yen)	2018			2017			2018		2017
New annualized premium sales	$	178		$	194		19.2		22.1
Increase (decrease) over prior period	(8.6		)%	(28.3		)%	(13.0	)%	(29.2	)%

The following table details the contributions to Aflac Japan's new annualized premium sales by major insurance product for the periods ended March 31.

	Three Months
	2018		2017
Cancer	55.5	%	50.2	%
Medical	34.0		36.8
Income support	2.1		2.0
Ordinary life:
WAYS	.5		.6
Child endowment	.5		.9
Other ordinary life (1)	6.3		8.3
Other	1.1		1.2
Total	100.0	%	100.0	%

⁽¹⁾ Includes term and whole life

The foundation of Aflac Japan's product portfolio has been, and continues to be, third sector products, which include cancer, medical and Income Support insurance products. Sales of third sector products on a yen basis decreased10.4% during the first quarter of 2018, compared with the same respective period in 2017. As expected, third sector sales faced difficult comparisons, due in part to the launch of Aflac Japan's refreshed medical insurance product in the first quarter of 2017 and the planned introduction of the new cancer insurance product following the completion of the Aflac Japan branch conversion. Aflac Japan has been focusing more on promotion of cancer and medical insurance products in this low-interest-rate environment. These products are less interest-rate sensitive and more profitable compared to first sector products. With continued cost pressure on Japan’s health care system, the Company expects the need for third sector products will continue to rise in the future and that the medical and cancer insurance products Aflac Japan provides will continue to be an important part of its product portfolio.

Independent corporate agencies and individual agencies contributed 43.3% of total new annualized premium sales for Aflac Japan in the first quarter of 2018, compared with 47.3% for the same period in 2017. Affiliated corporate agencies, which include Japan Post, contributed 52.0% of total new annualized premium sales in the first quarter of 2018, compared with 44.7% in the first quarter of 2017. Japan Post offers Aflac's cancer insurance products in more than 20,000 post offices. The Company believes this alliance with Japan Post has and will further benefit its cancer insurance sales. During the three-month period ended March 31, 2018, Aflac Japan recruited 28 new sales agencies. At March 31, 2018, Aflac Japan was represented by more than 10,600 sales agencies, with approximately 109,000 licensed sales associates employed by those agencies.

At March 31, 2018, Aflac Japan had agreements to sell its products at 372 banks, approximately 90% of the total number of banks in Japan. Bank channel sales accounted for 4.7% of new annualized premium sales in the first quarter of 2018 for Aflac Japan, compared with 8.0% during the first quarter of 2017.

Aflac Japan Investments

The level of investment income in yen is affected by available cash flow from operations, the timing of investing the cash flow, yields on new investments, the effect of yen/dollar exchange rates on U.S. dollar-denominated investment income, and other factors.

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As part of the Company's portfolio management and asset allocation process, Aflac Japan invests in yen and U.S. dollar-denominated investments. Yen-denominated investments primarily consist of JGBs and public and private fixed maturity securities. Aflac Japan's U.S. dollar-denominated investments include fixed maturity investments and growth assets, including public equity securities and alternative investments in limited partnerships or similar investment vehicles. Aflac Japan has been investing in both publicly-traded and privately originated U.S. dollar-denominated investment-grade and below-investment-grade fixed maturity securities and loans, and has entered into foreign currency forwards and options to hedge the currency risk on the fair value of a portion of the U.S. dollar investments.

The following table details the investment purchases for Aflac Japan.

	Three Months Ended March 31,
(In millions)	2018		2017
Yen-denominated:
Fixed maturity securities:
Japan government and agencies	$	3,187	$	2,541
Other fixed maturity securities	412		538
Equity securities	99		149
Total yen-denominated	$	3,698	$	3,228
U.S. dollar-denominated:
Fixed maturity securities:
Other fixed maturity securities	$	40	$	58
Infrastructure debt	0		30
Bank loans (1)	180		0
Equity securities	41		7
Other investments:
Transitional real estate loans	1,570		0
Commercial mortgage loans	13		48
Middle market loans	117		97
Limited partnerships	127		0
Total dollar-denominated	$	2,088	$	240
Total Aflac Japan purchases	$	5,786	$	3,468

⁽¹⁾ In 2017, represents funding made to unit trust structures

Aflac Japan's yen-denominated private placement portfolio had declined over the last several years as a result of call and maturity activity and no reinvestment activity. However, beginning in 2016 Aflac Japan began to selectively purchase yen-denominated private placements. In the first three months of 2018, Aflac Japan purchased $162 million of yen-denominated private placements, after purchasing $1.1 billion for the full year of 2017.

See the Analysis of Financial Condition section of this MD&A for further discussion of these investment programs, and see Notes 3 and 4 of the Notes to the Consolidated Financial Statements and Notes 1, 3 and 4 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report for more information regarding loans and loan receivables.

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The following table presents the results of Aflac Japan’s investment yields for the periods ended March 31.

	Three Months
	2018			2017
Total purchases for the period (in millions) (1)	$	5,659		$	3,468
New money yield (1), (2)	2.54		%	1.21		%
Return on average invested assets (3)	2.26			2.36
Portfolio book yield, including U.S. dollar-denominated investments, end of period (1)	2.55		%	2.57		%

⁽¹⁾ Includes fixed maturity securities, loan receivables, equity securities, and excludes alternative investments in limited partnerships

⁽²⁾ Reported on a gross yield basis; excludes investment expenses, external management fees, and amortized hedge costs

⁽³⁾ Net of investment expenses and amortized hedge costs, year-to-date number reflected on a quarterly average basis

The increase in the Aflac Japan new money yield in the three-month period ended March 31, 2018 was primarily due to increased allocations to higher yielding U.S. dollar denominated asset classes.

See Notes 3, 4 and 5 of the Notes to the Consolidated Financial Statements and the Analysis of Financial Condition section of this MD&A for additional information on the Company's investments and hedging strategies.

AFLAC U.S. SEGMENT

Aflac U.S. Pretax Adjusted Earnings

Changes in Aflac U.S. pretax adjusted earnings and profit margins are primarily affected by morbidity, mortality, expenses, persistency and investment yields. The following table presents a summary of operating results for Aflac U.S.

Aflac U.S. Summary of Operating Results

	Three Months Ended March 31,
(In millions)	2018				2017
Net premium income	$	1,427			$	1,390
Net investment income	175				178
Other income	2				1
Total adjusted revenues	1,604				1,569
Benefits and claims	697				710
Adjusted expenses:
Amortization of deferred policy acquisition costs	146				140
Insurance commissions	147				145
Insurance and other expenses	277				264
Total adjusted expenses	570				549
Total benefits and expenses	1,267				1,259
Pretax adjusted earnings(1)	$	337			$	310
Percentage change over previous period:
Net premium income	2.7			%	1.7			%
Net investment income	(1.7		)		2.0
Total adjusted revenues	2.2				1.7
Pretax adjusted earnings(1)	8.7				(6.7		)

⁽¹⁾ Aflac defines pretax adjusted earnings (a non-U.S. GAAP financial measure) as adjusted earnings before the application of income taxes. See the Results of Operations section of this MD&A for the Company's definition of adjusted earnings.

Annualized premiums in force increased2.7% to $6.0 billion at March 31, 2018, compared with $5.9 billion at March 31, 2017.

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The following table presents a summary of operating ratios for Aflac U.S.

	Three Months Ended March 31,
Ratios to total revenues:	2018		2017
Benefits and claims	43.5	%	45.2	%
Adjusted expenses:
Amortization of deferred policy acquisition costs	9.1		8.9
Insurance commissions	9.2		9.2
Insurance and other expenses	17.3		17.0
Total adjusted expenses	35.6		35.1
Pretax adjusted earnings(1)	21.0		19.7

⁽¹⁾ Aflac defines pretax adjusted earnings (a non-U.S. GAAP financial measure) as adjusted earnings before the application of income taxes. See the Results of Operations section of this MD&A for the Company's definition of adjusted earnings.

The benefit ratio in the three-month period ended March 31, 2018 decreased when compared with the same period in 2017 primarily due to slightly elevated lapses of older individual cancer policies and a few other, primarily cancer, reserve adjustments. For the three-month period ended March 31, 2018, the operating expense ratio increased compared with the same period in 2017, primarily due to planned spending increases reflecting elevated investments in the platform. The pretax adjusted profit margin (calculated by dividing adjusted earnings by adjusted revenues) increased slightly for the three-month period ended March 31, 2018, compared with the same period in 2017. For the full year of 2018, the Company expects benefit ratios to be relatively stable to 2017 levels, and expects somewhat higher expense ratios reflecting further investments in its U.S. platform. Note that all of these ratios-to-revenue reflect reduced net investment income due to the Company's planned drawdown of excess capital to lower Risk-Based Capital (RBC) ratios. (See the Capital Resources and Liquidity section of this MD&A for further discussion of the planned reduction of RBC.)

Aflac U.S. Sales

The following table presents Aflac's U.S. new annualized premium sales for the periods ended March 31.

	Three Months
(In millions)	2018			2017
New annualized premium sales	$	335		$	333
Increase (decrease) over prior period	.6		%	1.7		%

The following table details the contributions to Aflac's U.S. new annualized premium sales by major insurance product category for the periods ended March 31.

	Three Months
	2018		2017
Accident	29.3	%	29.2	%
Short-term disability	23.0		25.0
Critical care(1)	22.1		20.8
Hospital indemnity	14.9		13.8
Dental/vision	5.3		5.8
Life	5.4		5.4
Total	100.0	%	100.0	%

⁽¹⁾ Includes cancer, critical illness, and hospital intensive care products

New annualized premium sales for accident insurance, the Aflac U.S. leading product category, increased.6%; short-term disability sales decreased7.9%; critical care insurance sales (including cancer insurance) increased6.2%; and hospital indemnity insurance sales increased9.8% in the first quarter of 2018, compared with the same period in 2017.

The addition of group products has expanded Aflac U.S.'s reach and enabled Aflac U.S. to generate more sales opportunities with larger employers and through broker and sales agent channels. The Company anticipates that the appeal of Aflac U.S. group products will continue to enhance opportunities to connect with larger businesses and their

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employees. The Aflac U.S. portfolio of group and individual products offers businesses the opportunity to give their employees a more valuable and comprehensive selection of benefit options.

In the first quarter of 2018, the Aflac U.S. sales force included approximately 8,300 U.S. agents, including brokers, who were actively producing business on a weekly basis. The Company believes that this average weekly producer equivalent metric allows sales management to monitor progress and needs.

One Day Pay^SM is a claims initiative that Aflac U.S. has focused on to process, approve and pay eligible claims in just one day. The Company believes that this claims practice enhances the Aflac U.S. brand reputation and the trust policyholders have in Aflac, and it helps Aflac stand out from competitors.

Aflac U.S. products provide cash benefits that can be used to help with increasing out-of-pocket medical expenses, help cover household costs, or protect against income and asset loss. Group products and relationships with insurance brokers that handle the larger-case market are helping Aflac U.S. expand its reach by selling to larger businesses. Aflac U.S. is regularly evaluating the marketplace to identify opportunities to bring the most relevant, cost-effective products to customers. The Company believes the need for its products remains very strong, and Aflac U.S. continues to work on enhancing its distribution capabilities to access employers of all sizes, including initiatives that benefit the field force and the broker community. At the same time, the Company is seeking opportunities to leverage its brand strength and attractive product portfolio in the evolving health care environment.

U.S. Regulatory Environment

Healthcare Reform Legislation

The Affordable Care Act (ACA), federal health care legislation, was intended to give Americans of all ages and income levels access to comprehensive major medical health insurance and gave the U.S. federal government direct regulatory authority over the business of health insurance. While the ACA was enacted in 2010, the major elements of the law became effective on January 1, 2014. The ACA included major changes to the U.S. health care insurance marketplace. Among other changes, the ACA included an individual medical insurance coverage mandate (which has since been repealed effective 2019 by the Tax Act), provided for penalties on certain employers for failing to provide adequate coverage, created health insurance exchanges, and addressed coverage and exclusions as well as medical loss ratios. It also imposed an excise tax on certain high cost plans, known as the “Cadillac tax,” that is currently scheduled to begin in 2020. The ACA also included changes in government reimbursements and tax credits for individuals and employers and altered federal and state regulation of health insurers. The ACA, as enacted, does not require material changes in the design of the Company's insurance products. However, indirect consequences of the legislation and regulations could present challenges that could potentially have an impact on the Company's sales model, financial condition and results of operations. The United States Congress has considered and may continue to consider legislation that would repeal and replace key provisions of the ACA. There can be no assurance that any legislation affecting the ACA will be passed by Congress, nor as to the ultimate timing or provisions of any such legislation, nor as to the effect of any such legislation on the design or marketability of the Company's insurance products.

President Trump signed an Executive Order in October 2017 directing federal regulatory agencies to review and modify certain regulations issued under the ACA. The stated objectives of the Executive Order are to increase competition and consumer choices in health care markets, and to lower costs for health care, by making association health plans available to more employers, allowing employers to make better use of health reimbursement arrangements, and expanding coverage through short-term insurance. The Executive Order tasks three federal agencies, the Departments of Labor (DOL), Treasury, and Health and Human Services (HHS) with reviewing current rules and developing guidance to implement the order. While the details of any proposed modifications will not be known until further action by the agencies, the Company anticipates that the Executive Order will not have a significant impact on the availability or marketability of its products.

Tax Reform Legislation

The Tax Act was signed into law on December 22, 2017. Among other things, effective January 1, 2018, the Tax Act reduced the U.S. federal statutory corporate income tax rate from 35% to 21%, eliminated or reduced certain deductions and credits and limited the deductibility of interest expense and executive compensation.

The Tax Act also transitions international corporate taxation from a worldwide system to a modified territorial system, which in light of the current tax treatment of Aflac Japan as a branch has the effect of subjecting the earnings of Aflac Japan to Japan taxation and subjecting the Company's other earnings, including the consolidated earnings of the Parent

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Company, to U.S. taxation. The treatment of Aflac Japan as a branch for U.S. tax purposes did not change following the completion of its conversion from a branch structure to a subsidiary structure for legal purposes on April 1, 2018.

Aflac U.S. prices its business on an internal rate of return basis. The Aflac U.S. business has a financial structure that the Company expects to be neutral on a pricing basis from these tax changes. The Aflac U.S. products have high initial costs for marketing, underwriting and administration, which will have less tax relief under the changes and will increase the amount required to invest in new business. In addition, the Company expects that RBC requirements will increase on an after-tax basis, being another source of initial funding required for these products. The tax basis for reserves and DAC may also change the timing of tax payments in an accelerated or unfavorable direction. All of these effects will offset a favorable lower tax rate on income in later years. The overall impact is expected to be neutral on a pricing basis from these various effects.

The Tax Act changes became effective on January 1, 2018. However, because changes to tax rates are accounted for in the period of enactment, during the period ended December 31, 2017, the Company revalued its deferred tax assets and liabilities and recorded, as its current reasonable estimate, a net deferred tax liability reduction of $1.9 billion as of that date. For information on the effects of the Tax Act during the period ended December 31, 2017, see Note 10 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report. For information on the conversion of Aflac Japan from a branch to a subsidiary, see General Business under Item 1, Business, in the 2017 Annual Report and the Insurance Operations subsection of this MD&A.

Dodd-Frank Act

Title VII of the Dodd-Frank Act and regulations issued thereunder, in particular rules to require central clearing for certain types of derivatives, may have an impact on Aflac's derivative activity, including activity on behalf of Aflac Japan. In addition, in 2015 and 2016, six U.S. financial regulators, including the U.S. Commodity Futures Trading Commission (CFTC), issued final rules regarding the exchange of initial margin (IM) and variation margin (VM) for uncleared swaps that impose greater obligations on swap dealers regarding uncleared swaps with certain counterparties, such as Aflac. The requirements of such rules with respect to VM, as well as similar regulations in Europe, became effective on March 1, 2017. Full compliance with respect to all counterparties was required by September 1, 2017. The requirements of such rules with respect to IM are currently being phased in and will be fully implemented by September 1, 2020. In October of 2017, the CFTC and the European Commission each finalized comparability determinations that permit certain swap dealers who are subject to both regulatory margin regimes to take advantage of substituted compliance by complying with one set of margin requirements. The margin requirements are expected to result in more stringent collateral requirements and to affect other aspects of Aflac's derivatives activity.

The Dodd-Frank Act also established a Federal Insurance Office (FIO) under the U.S. Treasury Department to monitor all aspects of the insurance industry and of lines of business other than certain health insurance, certain long-term care insurance and crop insurance. Traditionally, U.S. insurance companies have been regulated primarily by state insurance departments. The FIO does not directly regulate the insurance industry, but under Dodd-Frank it has the power to preempt state insurance regulations that are inconsistent with international agreements reached by the federal government, subject to certain requirements and restrictions. In December 2013, the FIO released a report entitled "How To Modernize And Improve The System Of Insurance Regulation In The United States." The report was required by the Dodd-Frank Act, and included 18 recommended areas of near-term reform for the states, including addressing capital adequacy and safety/soundness issues, reform of insurer resolution practices, and reform of marketplace regulation. The report also listed nine recommended areas for direct federal involvement in insurance regulation. Some of the recommendations outlined in the FIO report released in December 2013 have been implemented. The National Association of Registered Agents and Brokers Reform Act, signed into law in January 2015, simplifies the agent and broker licensing process across state lines. The FIO has also engaged with the supervisory colleges to monitor financial stability and identify regulatory gaps for large national and internationally active insurers. The President and Congress have stated proposals to reform or repeal certain provisions of the Dodd-Frank Act, some of which have been implemented. The Company cannot predict with any degree of certainty what impact, if any, such proposals will have on Aflac's business, financial condition, or results of operations.

Insurance Guaranty Laws

Under state insurance guaranty association laws and similar laws in international jurisdictions, Aflac is subject to assessments, based on the share of business it writes in the relevant jurisdiction, for certain obligations of insolvent insurance companies to policyholders and claimants. In the United States, some states permit member insurers to recover assessments paid through full or partial premium tax offsets. The Company's policy is to accrue assessments when the entity for which the insolvency relates has met its state of domicile's statutory definition of insolvency, the amount of the

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loss is reasonably estimable and the related premium upon which the assessment is based is written. In most states, the definition is met with a declaration of financial insolvency by a court of competent jurisdiction.

Aflac U.S. Investments

The level of investment income is affected by available cash flow from operations, the timing of investing the cash flow, yields on new investments, and other factors.

As part of the Company's portfolio management and asset allocation process, Aflac U.S. invests in fixed maturity investments and growth assets, including public equity securities and alternative investments in limited partnerships. Aflac U.S. has been investing in both publicly traded and privately originated investment-grade and below-investment-grade fixed maturity securities and loan receivables.

The following table details the investment purchases for Aflac U.S.

	Three Months Ended March 31,
(In millions)	2018		2017
Fixed maturity securities:
Other fixed maturity securities	$	119	$	260
Infrastructure debt	16		5
Equity securities	23		2
Other investments:
Transitional real estate loans	73		0
Middle market loans	31		51
Limited partnerships	23		0
Total Aflac U.S. Purchases	$	285	$	318

See Note 3 of the Notes to the Consolidated Financial Statements and Notes 1 and 3 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report for more information regarding loans and loans receivables.

The following table presents the results of Aflac's U.S. investment yields for the periods ended March 31.

	Three Months
	2018			2017
Total purchases for period (in millions) (1)	$	262		$	318
New money yield (1), (2)	4.69		%	4.33		%
Return on average invested assets (3)	5.04			4.99
Portfolio book yield, end of period (1)	5.52		%	5.56		%

⁽¹⁾ Includes fixed maturity securities, loan receivables, equity securities, and excludes alternative investments in limited partnerships

⁽²⁾ Reported on a gross yield basis; excludes investment expenses and external management fees

⁽³⁾ Net of investment expenses, year-to-date number reflected on a quarterly average basis

The increase in the Aflac U.S. new money yield for the three-month period ended March 31, 2018 was primarily due to increases in U.S. interest rates as well as increased allocations to higher yielding asset classes. See Notes 3 and 5 of the Notes to the Consolidated Financial Statements and the Analysis of Financial Condition section of this MD&A for additional information on the Company's investments.

CORPORATE AND OTHER

In the first quarter of 2018, total revenue increased 17.9% to $79 million, reflecting an increase in net investment income of $14 million primarily generated by assets transferred as part of the drawdown of excess capital in the U.S. Pretax adjusted earnings were a loss of $46 million, compared with a loss of $52 million a year ago.

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ANALYSIS OF FINANCIAL CONDITION

The Company's financial condition has remained strong in the functional currencies of its operations. The yen/dollar exchange rate at the end of each period is used to translate yen-denominated balance sheet items to U.S. dollars for reporting purposes.

Investments

The Company’s investment strategy utilizes disciplined asset and liability management while seeking long-term risk-adjusted investment returns and the delivery of stable income within regulatory and capital objectives, and preserving shareholder value. In attempting to optimally balance these objectives, the Company seeks to maintain on behalf of Aflac Japan a diversified portfolio of yen-denominated investment assets, U.S. dollar-denominated investment portfolio hedged back to yen and a portfolio of unhedged U.S. dollar-denominated assets. As part of the Company's portfolio management and asset allocation process, Aflac U.S. invests in fixed maturity investments and growth assets, including public equity securities and alternative investments in limited partnerships. Aflac U.S. has been investing in both publicly traded and privately originated investment-grade and below-investment-grade fixed maturity securities and loans.

The following table details investments by segment.

Investments by Segment

		Aflac Japan						Aflac U.S.
(In millions)	March 31, 2018			December 31, 2017			March 31, 2018			December 31, 2017
Available for sale, fixed maturity securities, at fair value (1)		$	74,587		$	69,338		$	13,081		$	13,606
Held to maturity, fixed maturity securities, at amortized cost		33,377			31,430			0			0
Equity securities (1)		895			868			149			92
Other investments:
Transitional real estate loans		2,461			986			258			249
Commercial mortgage loans		776			767			141			141
Middle market loans		622			527			335			332
Policy loans		215			198			12			12
Short-term investments		0			57			0			0
Other		199			98			46			31
Total other investments		4,273			2,633			792			765
Total investments		113,132			104,269			14,022			14,463
Cash and cash equivalents		1,399			636			1,254			1,011
Total investments and cash (2)		$	114,531		$	104,905		$	15,276		$	15,474

⁽¹⁾ Includes perpetual securities

⁽²⁾ Excludes investments and cash held by the Parent Company and other business segments of $2,864 in 2018 and $3,280 in 2017

Cash and cash equivalents totaled $4.1 billion, or 3.1% of total investments and cash, as of March 31, 2018, compared with $3.5 billion, or 2.8%, at December 31, 2017. For a discussion of the factors affecting the Company's cash balance, see the Operating Activities, Investing Activities and Financing Activities subsections of this MD&A.

In 2017, Aflac U.S. became a member of the Federal Home Loan Bank of Atlanta (FHLB). As a member, Aflac U.S. can obtain access to low-cost funding and also receive dividends on FHLB stock. Additional FHLB stock purchases are required based upon the amount of funds borrowed from the FHLB. Aflac U.S. will be required to post acceptable forms of collateral for any borrowings it makes from the FHLB. The FHLB stock purchased by the Company is classified as a restricted investment and is included in other investments in the consolidated balance sheets.

For additional information concerning the Company's investments, see Notes 3, 4, and 5 of the Notes to the Consolidated Financial Statements.

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The ratings of the Company's securities referenced in the table below are based on the ratings designations provided by major Nationally Recognized Statistical Rating Organizations (NRSROs) (Moody's, S&P and Fitch) or, if not rated, are determined based on the Company's internal analysis of such securities. When the ratings issued by the rating agencies differ, the Company utilizes the second lowest rating when three or more rating agency ratings are available or the lowest rating when only two rating agency ratings are available.

The distributions of debt securities the Company owns, by credit rating, were as follows:

Composition of Securities Portfolio by Credit Rating

		March 31, 2018						December 31, 2017
	Amortized Cost			Fair       Value			Amortized Cost			Fair       Value
AAA		1.1	%		1.0	%		1.0	%		.9	%
AA		3.8			3.8			3.9			4.0
A		67.5			68.9			65.8			66.9
BBB		22.9			21.9			24.0			23.3
BB or lower		4.7			4.4			5.3			4.9
Total		100.0	%		100.0	%		100.0	%		100.0	%

As of March 31, 2018, the Company's direct and indirect exposure to securities in its investment portfolio that were guaranteed by third parties was immaterial both individually and in the aggregate.

The following table presents the 10 largest unrealized loss positions in the Company's portfolio as of March 31, 2018.

(In millions)	Credit Rating		Amortized Cost			Fair Value			Unrealized     Loss
Diamond Offshore Drilling Inc.		B		$	144		$	97		$	(47	)
Noble Holdings International Ltd.		CCC		100			62			(38		)
AXA		BBB		304			274			(30		)
The Sultanate of Oman		BBB		329			302			(27		)
Time Warner Cable Inc.		BBB		123			105			(18		)
Microsoft Corp.		AAA		234			217			(17		)
Baker Hughes Inc.		A		124			108			(16		)
Chevron Corp.		AA		181			166			(15		)
Weatherford Bermuda		CCC		49			35			(14		)
Kraft Heinz Co.		BBB		139			125			(14		)

Generally, declines in fair values can be a result of changes in interest rates, yen/dollar exchange rate, and changes in net spreads driven by a broad market move or a change in the issuer's underlying credit quality. As the Company believes these issuers have the ability to continue making timely payments of principal and interest, the Company views these changes in fair value to be temporary and does not believe it is necessary to impair the carrying value of these securities. See the Unrealized Investment Gains and Losses section in Note 3 of the Notes to the Consolidated Financial Statements for further discussions of unrealized losses related to financial institutions and other corporate investments.

Below-Investment-Grade Securities

The Company's portfolio of below-investment-grade securities includes debt securities purchased while the issuer was rated investment grade plus other loans and bonds purchased as part of an allocation to that segment of the market. The following is the Company's below-investment-grade exposure.

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Below-Investment-Grade Investments

	March 31, 2018
(In millions)	Par Value		Amortized Cost		Fair Value		Unrealized Gain (Loss)
Republic of South Africa	$	471	$	471	$	500	$	29
Investcorp Capital Limited	398		398		413		15
Navient Corp.	312		165		241		76
KLM Royal Dutch Airlines	282		207		246		39
Republic of Tunisia	254		149		182		33
Barclays Bank PLC	188		116		171		55
Telecom Italia SpA	188		188		252		64
Generalitat de Catalunya	151		56		146		90
Transnet	141		141		143		2
Diamond Offshore Drilling Inc.	123		144		97		(47		)
IKB Deutsche Industriebank AG	122		52		111		59
Alcoa, Inc.	100		89		104		15
Noble Holdings International Ltd.	94		100		62		(38		)
Petrobras International Finance Company	84		87		85		(2		)
EMC Corp.	80		82		74		(8		)
Teva Pharmaceuticals	76		76		67		(9		)
Teck Resources Ltd.	70		79		67		(12		)
Transocean Inc.	68		73		60		(13		)
CF Industries Inc.	60		60		58		(2		)
Nabors Industries Inc.	59		57		60		3
National Gas Co. Trinidad and Tobago	52		50		54		4
Votorantim Overseas Trading IV Ltd.	50		49		54		5
Other Issuers (below $50 million in par value)	280		274		258		(16		)
Subtotal (1)	3,703		3,163		3,505		342
Senior secured bank loans	1,652		1,712		1,654		(58		)
High yield corporate bonds	528		544		527		(17		)
Middle market loans, net of reserves (2)	970		957		956		(1		)
Grand Total	$	6,853	$	6,376	$	6,642	$	266

⁽¹⁾ Securities initially purchased as investment grade, but have subsequently been downgraded to below investment grade

⁽²⁾ Middle market loans are carried at amortized cost

The Company invests in senior secured bank loans and middle market loans primarily to U.S. corporate borrowers, most of which have below-investment-grade ratings. The bank loan and middle market loan investment programs are managed externally by third party firms specializing in this asset class and require a minimum average portfolio rating of low BB and a minimum single investment rating of low B from one of the NRSROs. The objectives of these programs include enhancing the yield on invested assets, achieving further diversification of credit risk, and mitigating the risk of rising interest rates and hedge costs through the acquisition of floating rate assets.

The Company maintains an allocation to higher yielding corporate bonds within the Aflac Japan and Aflac U.S. portfolios. Most of these securities were rated below-investment-grade at the time of purchase, but the Company also purchased several that were rated investment grade which, because of market pricing, offer yields commensurate with below-investment-grade risk profiles. The objective of this allocation was to enhance the Company's yield on invested assets and further diversify credit risk. All investments must have a minimum rating of low BB using the Company's above described rating methodology and are managed by the Company's internal credit portfolio management team.

Securities by Type of Issuance

The Company has investments in both publicly and privately issued securities. The Company's ability to sell either type of security is a function of overall market liquidity which is impacted by, among other things, the amount of

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outstanding securities of a particular issuer or issuance, trading history of the issue or issuer, overall market conditions, and idiosyncratic events affecting the specific issue or issuer.

The following table details investment securities by type of issuance.

Investment Securities by Type of Issuance

		March 31, 2018						December 31, 2017
(In millions)	Amortized Cost			Fair    Value			Amortized Cost			Fair   Value
Publicly issued securities:
Fixed maturity securities (1)		$	88,739		$	99,449		$	81,454		$	93,025
Equity securities (1)		1,092			1,092			831			1,006
Total publicly issued		89,831			100,541			82,285			94,031
Privately issued securities: (2)
Fixed maturity securities (1)		26,245			30,052			25,108			29,360
Equity securities (1)		16			16			15			17
Total privately issued		26,261			30,068			25,123			29,377
Total investment securities		$	116,092		$	130,609		$	107,408		$	123,408

⁽¹⁾ Includes perpetual securities

⁽²⁾ Includes Rule 144A securities

The Company held $1,845 million and $1,789 million of perpetual securities at fair value ($1,577 million and $1,462 million at amortized cost) as of March 31, 2018 and December 31, 2017, respectively. The perpetual securities the Company holds were largely issued by banks that are systemically important to the financial markets of the sovereign country of domicile of the issuer. Generally, the Company believes regulatory changes made in the banking industry following the Global Financial Crisis and the European Sovereign Crisis, including increased capital and liquidity requirements and a reduction of business risk, have improved overall bank creditworthiness. However, bank capital securities may be subject to varying bail-in/resolution regimes in their home countries, which may include conversion or write-down provisions when bank regulators determine that the institution has reached the point of non-viability. Such actions could result in lower cash flows and ratings downgrades of the affected securities, which in turn could result in a reduction of fair value of the securities and increase the Company’s regulatory capital requirements. These factors are an integral part of the Company's credit review process.

The following table details the Company's privately issued investment securities.

Privately Issued Securities

(Amortized cost, in millions)	March 31, 2018				December 31, 2017
Privately issued securities as a percentage of total investment securities		22.6		%		23.4		%
Privately issued securities held by Aflac Japan		$	23,468			$	22,354
Privately issued securities held by Aflac Japan as a percentage of total investment securities		20.2		%		20.8		%

Reverse-Dual Currency Securities⁽¹⁾ 

(Amortized cost, in millions)	March 31, 2018				December 31, 2017
Privately issued reverse-dual currency securities		$	6,030			$	5,669
Publicly issued collateral structured as reverse-dual currency securities		1,478				1,390
Total reverse-dual currency securities		$	7,508			$	7,059
Reverse-dual currency securities as a percentage of total investment securities		6.5		%		6.6		%

⁽¹⁾ Principal payments in yen and interest payments in dollars

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Aflac Japan has a portfolio of privately issued securities to better match liability characteristics and secure higher yields than those available on Japanese government or other public corporate bonds.Aflac Japan’s investments in yen-denominated privately issued securities consist primarily of non-Japanese issuers, are rated investment grade at purchase and have longer maturities, thereby allowing the Company to improve asset/liability matching and overall investment returns. These securities are generally either privately negotiated arrangements or issued under medium-term note programs and have standard documentation commensurate with credit ratings of the issuer, except when internal credit analysis indicates that additional protective and/or event-risk covenants were required. Many of these investments have protective covenants appropriate to the specific investment. These may include a prohibition of certain activities by the borrower, maintenance of certain financial measures, and specific conditions impacting the payment of the Company's notes.

Hedging Activities

Aflac Japan’s U.S. Dollar-Denominated Investments

Most of Aflac Japan's cash, investments, and liabilities are yen-denominated. However, Aflac Japan also owns U.S. dollar-denominated investments, a portion of which Aflac Japan hedges with foreign currency forwards and options. The currency risk being hedged is generally based on fair value of hedged investments. The following table summarizes the U.S. dollar-denominated investments held by Aflac Japan.

	March 31, 2018				December 31, 2017
(In millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Available-for-sale securities:
Fixed maturity securities (excluding bank loans) (1)	$	20,329	$	20,928	$	19,622	$	21,863
Fixed maturity securities - bank loans (floating rate)	1,930		1,858		1,936		1,865
Equity securities(1)	185		185		147		173
Other investments:
Transitional real estate loans (floating rate)	2,461		2,470		986		984
Commercial mortgage loans	776		751		767		753
Middle market loans (floating rate)	622		625		527		530
Alternative investments	199		199		97		97
Total U.S. dollar-denominated investments in Aflac Japan	$	26,502	$	27,016	$	24,082	$	26,265

⁽¹⁾ Includes perpetual securities

As of March 31, 2018, Aflac Japan had $9.9 billion outstanding notional amounts of foreign currency forwards and $9.4 billion outstanding notional amounts of foreign currency options, of which none were in-the-money, hedging the U.S. dollar-denominated investments, resulting in the unhedged fair value of the U.S. dollar Japan portfolio of $15.0 billion, excluding certain U.S. dollar-denominated assets shown in the table above as a result of consolidation that have been economically converted to yen using derivatives.

Foreign exchange derivatives used for hedging are periodically settled, which results in cash receipt or payment at maturity or early termination. The Company had net cash settlements of $1 million and $163 million for the three-month periods ended March 31, 2018 and 2017, respectively, associated with the currency derivatives used for hedging Aflac Japan’s U.S. dollar-denominated investments.

For additional discussion of the risks associated with the foreign currency exposure refer to the Currency Risk section in Item 7A., Quantitative and Qualitative Disclosures about Market Risk, and the Risk Factor sections titled “The Company is exposed to foreign currency fluctuations in the yen/dollar exchange rate" and “Lack of availability of acceptable yen-denominated investments could adversely affect the Company's results of operations, financial position or liquidity" in the 2017 Annual Report. For discussion of the Company’s view on the stressed economic surplus in Aflac Japan, refer to the Investments subsection within Item 1., Business, in the 2017 Annual Report.

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The following table presents metrics related to hedge costs for the periods ended March 31.

Hedge Cost Metrics⁽¹⁾ 

	Three Months
	2018	2017
FX forward notional at end of period (in billions of dollars)(2)	9.9	10.7
Weighted average original tenor (in months)(3)	30.9	27.4
Weighted average remaining tenor (in months)(4)	23.6	23.8
Annualized amortized hedge costs (in basis points)(5)	225	184
Amortized hedge costs for period (in millions of dollars)	(55)	(52)

⁽¹⁾ See the Results of Operations section of this MD&A for the Company's definition of amortized hedge costs.

⁽²⁾ Notional is reported net of any offsetting positions

⁽³⁾ Tenor based on derivative's original execution date to settlement date

⁽⁴⁾ Tenor based on period reporting date to settlement date

⁽⁵⁾ Based on annualized amortized hedge costs divided by average FX forward notional for the period

Net Investment Hedge

The Company's investment in Aflac Japan is affected by changes in the yen/dollar exchange rate. To mitigate this exposure, the Company has taken several courses of action. First, Aflac Japan maintains certain unhedged U.S. dollar-denominated securities, which serve as an economic currency hedge of a portion of the Company's investment in Aflac Japan. Second, the Company has designated the majority of the Parent Company’s yen-denominated liabilities (notes payable and loans) as non-derivative hedging instruments and certain foreign currency forwards and options as derivative hedges of the Company's net investment in Aflac Japan. The Company makes its accounting designation of net investment hedge at the beginning of each quarter. If the total of the designated Parent Company non-derivative and derivative notional is equal to or less than the Company's net investment in Aflac Japan, the hedge is deemed to be effective, and the currency exchange effect on the yen-denominated liabilities and the change in estimated fair value of the derivatives are reported in the unrealized foreign currency component of other comprehensive income. The Company's net investment hedge was effective during the three-month periods ended March 31, 2018 and 2017, respectively.

For the hedge of the Company's net investment in Aflac Japan, the Company has designated certain of the Parent Company's yen-denominated liabilities and foreign currency forwards and options as accounting hedges of its net investment in Aflac Japan. The Company's consolidated yen-denominated net asset position was partially hedged at $1.4 billion as of March 31, 2018, with hedging instruments comprised completely of yen-denominated debt, compared with a hedge of $1.8 billion as of December 31, 2017, with hedging instruments comprised of $1.4 billion of yen-denominated debt and $.4 billion of foreign currency forwards and options.

See Note 4 of the Notes to the Consolidated Financial Statements for additional information on the Company's hedging activities.

Deferred Policy Acquisition Costs

The following table presents deferred policy acquisition costs by segment.

(In millions)	March 31, 2018			December 31, 2017			% Change
Aflac Japan		$	6,577		$	6,150		6.9	%	(1)
Aflac U.S.		3,356			3,355			0.0
Total		$	9,933		$	9,505		4.5	%

⁽¹⁾Aflac Japan’s deferred policy acquisition costs increased .5% in yen during the three months ended March 31, 2018.

See Note 6 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report for additional information on the Company's deferred policy acquisition costs.

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Policy Liabilities

The following table presents policy liabilities by segment.

(In millions)	March 31, 2018				December 31, 2017				% Change
Aflac Japan		$	95,351			$	89,132			7.0	%	(1)
Aflac U.S.		10,692				10,625				.6
Other		160				138				15.9
Intercompany eliminations(2)		(804		)		(748		)		7.5
Total		$	105,399			$	99,147			6.3	%

⁽¹⁾ Aflac Japan’s policy liabilities increased .6% in yen during the three months ended March 31, 2018.

⁽²⁾ Elimination entry necessary due to recapture of a portion of policy liabilities ceded externally, as a result of the reinsurance retrocession transaction as described in Note 7 of the Notes to the Consolidated Financial Statements.

Notes Payable

Notes payable totaled $5.4 billion at March 31, 2018, compared with $5.3 billion at December 31, 2017.

See Note 8 of the accompanying Notes to the Consolidated Financial Statements for additional information on the Company's notes payable.

Benefit Plans

Aflac Japan and Aflac U.S. have various benefit plans. For additional information on the Company's Japanese and U.S. plans, see Note 12 of the accompanying Notes to the Consolidated Financial Statements and Note 14 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

Policyholder Protection

Policyholder Protection Corporation

The Japanese insurance industry has a policyholder protection system that provides funds for the policyholders of insolvent insurers. Legislation enacted regarding the framework of the Life Insurance Policyholder Protection Corporation (LIPPC) included government fiscal measures supporting the LIPPC. On March 30, 2012, the Diet approved legislation to enhance the stability of the LIPPC by extending the government's fiscal support of the LIPPC through March 2017. On November 25, 2016, Japan's Diet passed legislation that again extends the government's fiscal support of the LIPPC through March 2022. Effective April 2014, the annual LIPPC contribution amount for the total life industry was lowered from 40 billion yen to 33 billion yen.

Guaranty Fund Assessments

Under state guaranty association laws, certain insurance companies can be assessed (up to prescribed limits) for certain obligations to the policyholders and claimants of impaired or insolvent insurance companies that write the same line or similar lines of business. The amount of the guaranty fund assessment that an insurer is assessed is based on its proportionate share of premiums in that state.

As of December 31, 2017, the Company has estimated and recognized the impact of its share of guaranty fund assessments resulting from the liquidation of a long-term care insurer. See Note 15 of the Notes to the Consolidated Financial Statements for further information on the assessment.

Off-Balance Sheet Arrangements

As of March 31, 2018, the Company had no material letters of credit, standby letters of credit, guarantees or standby repurchase obligations. See Note 15 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report for information on material unconditional purchase obligations that are not recorded on the Company's balance sheet.

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CAPITAL RESOURCES AND LIQUIDITY

Aflac provides the primary sources of liquidity to the Parent Company through dividends and management fees. The following table presents the amounts provided for the three-month periods ending March 31.

Liquidity Provided by Aflac to Parent Company

(In millions)	2018		2017
Dividends declared or paid by Aflac	$	100	$	400
Management fees paid by Aflac	96		80

The primary uses of cash by the Parent Company are shareholder dividends, the repurchase of its common stock and interest on its outstanding indebtedness and operating expenses. The Parent Company's sources and uses of cash are reasonably predictable and are not expected to change materially in the future. For additional information, see the Financing Activities subsection of this MD&A.

The Parent Company also accesses debt security markets to provide additional sources of capital. In August 2016, the Company filed a shelf registration statement with Japanese regulatory authorities that allows the Company to conduct public offerings of bonds in Japan, including yen-denominated Samurai notes, up to 200 billion yen or its equivalent through August 2018. The shelf registration statement is for possible public offerings in Japan, but the bonds issued under the shelf may be transferred by the bondholders to U.S. persons in compliance with U.S. law. The Company filed a shelf registration statement with the SEC in May 2015 that allows the Company to issue an indefinite amount of senior and subordinated debt, in one or more series, from time to time until May 2018. The Company believes outside sources for additional debt and equity capital, if needed, will continue to be available. For additional information, see Note 8 of the Notes to the Consolidated Financial Statements.

The principal sources of cash for the Company's insurance operations are premiums and investment income. The primary uses of cash by the Company's insurance operations are investments, policy claims, commissions, operating expenses, income taxes and payments to the Parent Company for management fees and dividends. Both the sources and uses of cash are reasonably predictable.

When making an investment decision, the Company's first consideration is based on product needs. The Company's investment objectives provide for liquidity through the purchase of investment-grade debt securities. These objectives also take into account duration matching, and because of the long-term nature of the Company's business, the Company has adequate time to react to changing cash flow needs.

As a result of policyholder aging, claims payments are expected to gradually increase over the life of a policy. Therefore, future policy benefit reserves are accumulated in the early years of a policy and are designed to help fund future claims payments. The Company expect its future cash flows from premiums and its investment portfolio to be sufficient to meet its cash needs for benefits and expenses.

As of March 31, 2018, the Parent Company and Aflac had four lines of credit with third parties as well as two intercompany lines of credit. For additional information on the Company's lines of credit, see Note 8 of the Notes to the Consolidated Financial Statements.

As part of the FHLB financing arrangement as discussed previously in the Analysis of Financial Condition section of this MD&A, Aflac U.S. borrowed and repaid $52 million during the first quarter of 2018.

The Company's financial statements convey its financing arrangements during the periods presented. The Company has not engaged in material intra-period short-term financings during the periods presented that are not otherwise reported in its balance sheet or disclosed therein. The Company was in compliance with all of the covenants of its notes payable and lines of credit at March 31, 2018. The Company has not entered into transactions involving the transfer of financial assets with an obligation to repurchase financial assets that have been accounted for as a sale under applicable accounting standards, including securities lending transactions. See Notes 3 and 4 of the Notes to the Consolidated Financial Statements and Notes 1, 3, and 4 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report for more information on the Company's securities lending and derivative activities. With the exception of disclosed activities in those referenced footnotes, the Company does not have a known trend, demand, commitment, event or uncertainty that would reasonably result in its liquidity increasing or decreasing by a material amount. The Company's

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cash and cash equivalents include unrestricted cash on hand, money market instruments, and other debt instruments with a maturity of 90 days or less when purchased, all of which has minimal market, settlement or other risk exposure.

Consolidated Cash Flows

The Company translates cash flows for Aflac Japan’s yen-denominated items into U.S. dollars using weighted-average exchange rates. In periods when the yen weakens, translating yen into dollars causes fewer dollars to be reported. When the yen strengthens, translating yen into dollars causes more dollars to be reported.

The following table summarizes consolidated cash flows by activity for the three-month periods ended March 31.

(In millions)	2018			2017
Operating activities	$	1,238		$	1,757
Investing activities	(199		)	(1,527		)
Financing activities	(473		)	(876		)
Exchange effect on cash and cash equivalents	23			(8		)
Net change in cash and cash equivalents	$	589		$	(654	)

Operating Activities

The following table summarizes operating cash flows by source for the three-month periods ended March 31. 

(In millions)	2018		2017
Aflac Japan	$	1,062	$	1,311
Aflac U.S. and other operations	176		446
Total	$	1,238	$	1,757

Investing Activities

Operating cash flow is primarily used to purchase investments to meet future policy obligations. The following table summarizes investing cash flows by source for the three-month periods ended March 31.

(In millions)	2018			2017
Aflac Japan	$	181		$	(1,191	)
Aflac U.S. and other operations	(380		)	(336		)
Total	$	(199	)	$	(1,527	)

The significant increase in cash inflows associated with Aflac Japan is driven by the inflows associated with cash collateral received from securities lending activities of over $4 billion which is only partially offset by the investment purchases of bonds and other investments.

Prudent portfolio management dictates that the Company attempts to match the duration of its assets with the duration of its liabilities. Currently, when the Company's fixed maturity securities mature, the proceeds may be reinvested at a yield below that required for the accretion of policy benefit liabilities on policies issued in earlier years. However, the long-term nature of the Company's business and its strong cash flows provide the Company with the ability to minimize the effect of mismatched durations and/or yields identified by various asset adequacy analyses. From time to time or when market opportunities arise, the Company disposes of selected fixed maturity securities that are available for sale to improve the duration matching of assets and liabilities, improve future investment yields, and/or re-balance its portfolio. As a result, dispositions before maturity can vary significantly from year to year.

Financing Activities

Consolidated cash used by financing activities was $473 million in the first three months of 2018, compared with consolidated cash used by financing activities of $876 million for the same period of 2017.

See the preceding discussion in this Capital Resources and Liquidity section of MD&A for details and any outstanding balances as of March 31, 2018, for the Company's lines of credit and FHLB financing arrangement.

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The Company was in compliance with all of the covenants of its notes payable and lines of credit at March 31, 2018.

Cash returned to shareholders through dividends and treasury stock purchases was $491 million during the three-month period ended March 31, 2018, compared with $776 million during the three-month period ended March 31, 2017.

The following tables present a summary of treasury stock activity during the three-month periods ended March 31.

Treasury Stock Purchased

(In millions of dollars and thousands of shares)	2018		2017
Treasury stock purchases	$	296	$	1,220
Number of shares purchased:
Open market	6,640		16,986
Other	315		288
Total shares purchased	6,955		17,274

Treasury Stock Issued

(In millions of dollars and thousands of shares)	2018		2017
Stock issued from treasury:
Cash financing	$	14	$	22
Noncash financing	15		28
Total stock issued from treasury	$	29	$	50
Number of shares issued	788		790

During the first three months of 2018, the Company repurchased 6.6 million shares of its common stock for $296 million as part of its share repurchase program. As of March 31, 2018, a remaining balance of 91.4 million shares of the Company's common stock was available for purchase under share repurchase authorizations by its board of directors. The Company currently plans to repurchase a total of $1.1 billion to $1.4 billion of its common stock in 2018, assuming stable capital conditions and the absence of compelling alternatives.

Cash dividends paid to shareholders were $.26 per share in the first quarter of 2018, compared with $.22 per share in the first quarter of 2017. The following table presents the dividend activity for the three-month periods ended March 31.

(In millions)	2018		2017
Dividends paid in cash	$	195	$	166
Dividends through issuance of treasury shares	8		7
Total dividends to shareholders	$	203	$	173

In April 2018, the board of directors declared the second quarter cash dividend of $.26 per share, an increase of 18.2% compared with the same period in 2017. The dividend is payable on June 1, 2018 to shareholders of record at the close of business on May 23, 2018.

Regulatory Restrictions

Aflac and CAIC are domiciled in Nebraska and are subject to its regulations. Subsequent to the Japan branch conversion to a subsidiary, Aflac Japan is domiciled in Japan and subject to local regulations. See further discussion below. A life insurance company’s statutory capital and surplus is determined according to rules prescribed by the National Association of Insurance Commissioners (NAIC), as modified by the insurance department in the insurance company’s state of domicile. Statutory accounting rules are different from U.S. GAAP and are intended to emphasize policyholder protection and company solvency. Similar laws apply in New York, the domiciliary jurisdiction of Aflac's New York insurance subsidiary.

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The continued long-term growth of the Company's business may require increases in the statutory capital and surplus of its insurance operations. Aflac’s insurance operations may secure additional statutory capital through various sources, such as internally generated statutory earnings, capital contributions by the Parent Company from funds generated through debt or equity offerings, or reinsurance transactions. The NAIC’s risk-based capital (RBC) formula is used by insurance regulators to help identify inadequately capitalized insurance companies. The RBC formula quantifies insurance risk, business risk, asset risk and interest rate risk by weighing the types and mixtures of risks inherent in the insurer’s operations. As of March 31, 2018, Aflac’s RBC ratio remains high and reflects a strong capital and surplus position. The U.S. Tax Act will have a negative impact on Aflac's U.S.-only RBC ratio. This reduction occurs as a result of writing down deferred tax assets and the increase in required capital due to the reduction in tax rates. However, Aflac expects to recover from this negative impact over a period of three to five years through additional statutory income, assuming that the additional income is fully retained.

The maximum amount of dividends that can be paid to the Parent Company by Aflac without prior approval of Nebraska's director of insurance is the greater of the net income from operations, which excludes net realized investment gains, for the previous year determined under statutory accounting principles, or 10% of statutory capital and surplus as of the previous year-end. Dividends declared by Aflac during 2018 in excess of $2.6 billion would be considered extraordinary and require such approval. Subsequent to the Japan branch conversion to a subsidiary, the Company intends to use extraordinary dividends as needed to actively manage to appropriate RBC levels that are lower yet sufficient to maintain ratings and support prudent capital management.

In addition to limitations and restrictions imposed by U.S. insurance regulators, after the Japan branch conversion as of April 1, 2018, the new Japan subsidiary is required to meet certain financial criteria as governed by Japanese corporate law in order to provide dividends to the Parent Company. Under these criteria, dividend capacity at the Japan subsidiary is defined as retained earnings plus other capital reserve less net after-tax unrealized losses on available-for-sale securities. These dividend capacity requirements are generally aligned with the solvency margin ratio (SMR). Japan's Financial Services Agency (FSA) maintains its own solvency standard which is quantified through the SMR. Aflac Japan's SMR is sensitive to interest rate, credit spread, and foreign exchange rate changes, therefore the Company continues to evaluate alternatives for reducing this sensitivity. In the event of a rapid change in market risk conditions causing SMR to decline, the Company has two senior unsecured revolving credit facilities in the amounts of 100 billion yen and 55 billion yen, respectively, and a committed reinsurance facility in the amount of approximately 110 billion yen as a capital contingency plan. (See Notes 7 and 8 of the Notes to the Consolidated Financial Statements for additional information.)

The Company has already undertaken various measures to mitigate the sensitivity of Aflac Japan's SMR. For example, the Company employs policy reserve matching (PRM) investment strategies, which is a Japan-specific accounting treatment that reduces SMR interest rate sensitivity since PRM-designated investments are carried at amortized cost consistent with corresponding liabilities. In order for a PRM-designated asset to be held at amortized cost, there are certain criteria that must be maintained. The primary criteria relates to maintaining the duration of designated assets and liabilities within a specified tolerance range. If the duration difference is not maintained within the specified range without rebalancing, then a certain portion of the assets must be re-classified as available for sale and held at fair value with any associated unrealized gain or loss recorded in surplus. To rebalance, assets may need to be sold in order to maintain the duration with the specified range, resulting in realizing a gain or loss from the sale. For U.S. GAAP, PRM investments are categorized as available-for-sale. The Company also uses foreign currency derivatives to hedge a portion of its U.S. dollar-denominated investments. (See Notes 3, 4 and 8 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report for additional information on the Company's investment strategies, hedging activities, and reinsurance, respectively.)

As of March 31, 2018, Aflac Japan's SMR remains high and reflects a strong capital and surplus position. As part of the conversion of Aflac Japan from a branch to a subsidiary on April 1, 2018, the Company expects an accounting-driven decline in the SMR of approximately 130 points, based on the SMR as of December 31, 2017. Subject to regulatory approval, the Company expects to be able to pay dividends out of certain accounts, thus restoring this accounting impact over an estimated three-year period. The FSA has been conducting field testing with the insurance industry concerning the introduction of an economic value-based solvency regime. The field testing will assist the FSA in determining if an economic value-based solvency regime in Japan will be appropriate for the insurance industry.

Payments are made from Aflac Japan to the Parent Company for management fees and to Aflac U.S. for allocated expenses and remittances of earnings. The following table details Aflac Japan remittances for the three-month periods ended March 31.

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Aflac Japan Remittances

(In millions of dollars and billions of yen)	2018		2017
Aflac Japan management fees paid to Parent Company	$	40	$	28
Expenses allocated to Aflac Japan (in dollars)	8		32
Aflac Japan profit remittances to Aflac U.S. (in dollars)	312		275
Aflac Japan profit remittances to Aflac U.S. (in yen)	33.4		31.3

The Company had foreign exchange forwards and options as part of an economic hedge of foreign exchange risk on 30.0 billion yen of profit repatriation received from Aflac Japan in the first quarter of 2018, resulting in $2 million more funds received when the yen were exchanged into dollars relative to what would have been received at the then-current exchange rate.

For additional information on regulatory restrictions on dividends, profit repatriations and other transfers, see Note 13 of the Notes to the Consolidated Financial Statements and the Regulatory Restrictions subsection of MD&A, both in the 2017 Annual Report.

Other

For information regarding commitments and contingent liabilities, see Note 13 of the Notes to the Consolidated Financial Statements.

Additional Information

Investors should note that the Company announces material financial information in its SEC filings, press releases and public conference calls. In accordance with SEC guidance, the Company may also use the Investor Relations section of the Company's website (http://investors.aflac.com) to communicate with investors about the Company. It is possible that the financial and other information the Company posts there could be deemed to be material information. The information on the Company's website is not part of this document.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

The Company is exposed primarily to the following types of market risks: currency risk, interest rate risk, credit risk and equity risk. The Company regularly monitors its market risks and uses a variety of strategies to manage its exposure to these market risks. A description of the Company's market risk exposures may be found under “Quantitative and Qualitative Disclosures About Market Risk” in Part II, Item 7A, of the 2017 Annual Report. There have been no material changes to the Company's market risk exposures from the market risk exposures previously disclosed in the 2017 Annual Report.

Item 4. Controls and Procedures

Disclosure Controls and Procedures

The Company’s management, with the participation of the Company’s Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures (as such term is defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) as of the end of the period covered by this quarterly report (the “Evaluation Date”). Based on such evaluation, the Company’s Chief Executive Officer and Chief Financial Officer have concluded that, as of the Evaluation Date, the Company’s disclosure controls and procedures are effective.

Changes in Internal Control Over Financial Reporting

There have not been any changes in the Company’s internal control over financial reporting (as such term is defined in Rule 13a-15(f) under the Exchange Act) during the first fiscal quarter of 2018 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting, with the exception of the new and revised internal controls related to the implementation of the upgrade to a newer version of the Company's financial accounting and reporting consolidation system effective January 2018. The Company's management believes that the implementation of this system has improved and enhanced its internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

On December 14, 2017, three former independent sales contractors filed a shareholders derivative complaint in the U.S. District Court for the Southern District of New York naming the Parent Company as nominal defendant and the Parent Company’s Chairman and Chief Executive Officer, several of its directors, and a former officer and director as defendants. The complaint alleges breaches of fiduciary duty, misstatements and omissions in the Company’s public disclosures, and insider trading. The Company’s Board of Directors had previously established a special litigation committee (SLC) in July 2017 to investigate certain allegations underlying the derivative action. The SLC issued a report of its investigation in September 2017 and another report in February 2018, each of which determined that it was not in the best interests of the Company to pursue the action demanded by the shareholders. An amended complaint was filed on January 31, 2018. On February 12, 2018, this litigation was transferred to the U.S. District Court for the Middle District of Georgia. The Company has filed a motion to dismiss based upon the conclusions of the special committee in its reports. The SLC issued a third report of its investigation in May 2018 regarding certain additional allegations raised in the amended complaint, in which the SLC also determined that it was not in the best interests of the Company to pursue the action demanded by the shareholders. The Company believes the outcome of this litigation will not have a material adverse effect on its financial position, results of operation or cash flows.

On February 9, 2018, a putative class action complaint was filed in the U.S. District Court for the Middle District of Georgia, purportedly on behalf of purchasers of Aflac Incorporated stock between February 27, 2013 and January 11, 2018. The complaint names the Parent Company and certain officers as defendants and alleges the Company’s public disclosures were misleading in relation to purported recruiting practices, misclassification of independent contractors, manipulation of a sales metric, and failure to adhere to the Company’s Code of Business Conduct and Ethics and corporate social responsibility standards. The complaint seeks class action certification, an unspecified amount for compensatory damages and interest, costs and expenses, and other unspecified equitable or injunctive relief. The Company believes that this lawsuit is without merit. The Company intends to vigorously defend against the allegations made in the complaint and to file a motion to dismiss the action. The Company believes the outcome of this litigation will not have a material adverse effect on its financial position, results of operation or cash flows.

The Company is a defendant in various lawsuits considered to be in the normal course of business. Members of the Company's senior legal and financial management teams review litigation on a quarterly and annual basis. The final results of any litigation cannot be predicted with certainty. Although some of this litigation is pending in states where large punitive damages, bearing little relation to the actual damages sustained by plaintiffs, have been awarded in recent years, the Company believes the outcome of pending litigation will not have a material adverse effect on its financial position, results of operations, or cash flows.

Item 1A. Risk Factors

The following should be read in conjunction with and supplements and amends the risk factors that may affect the

Company’s business or operations described under “Risk Factors” in Part I, Item 1A. of the Company's 2017 Annual Report on Form 10-K for the year ended December 31, 2017.

Failure to implement the planned conversion of the Japan branch to a legal subsidiary could adversely affect the Company's business, results of operations, or financial position.

The implementation of the Japan branch conversion to a legal subsidiary, which the Company executed in the second quarter of 2018, is a complex undertaking and involves a number of risks, including information technology-related delays and problems, personnel loss, regulatory law changes, legal and regulatory requirements, changes to the Company's operations, and management distraction. The transaction may entail modifications of certain aspects of the Company's operations, which could result in additional costs or reduce net earnings. Any of these risks, if realized, could result in a material adverse effect on the Company's business, results of operations or financial condition.

The Japan branch conversion is conditioned on the continued validity of a private letter ruling that the Company received from the U.S. Internal Revenue Service (IRS). Notwithstanding the receipt of the private letter ruling, the IRS could determine that the Japan branch conversion should be treated as a taxable transaction. For example, the IRS could conclude that the representations, assumptions and covenants on which the private letter ruling is based are untrue or not accurate. If the IRS made such a conclusion, the Japan branch conversion could be treated as a taxable transaction, and

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the Company could incur significant U.S. federal income tax liabilities or litigation costs to defend the tax treatment by the IRS.

Interruption in telecommunication, information technology and other operational systems, or a failure to maintain the security, confidentiality, integrity or privacy of sensitive data residing on such systems, could harm the Company's business.

The Company stores confidential policyholder, employee, agent, and other proprietary information on its information technology systems. In addition, the Company depends heavily on its telecommunication, information technology and other operational systems and on the integrity and timeliness of data it uses to run its businesses and service its customers. These systems may fail to operate properly or become disabled as a result of events or circumstances wholly or partly beyond the Company's control. Additionally, design flaws may exist in certain systems, processes, software, or configurations that in turn may result in system failure, data corruption, or compromise. Despite the Company's implementation of a variety of security measures to defend against threats incurred on a daily basis, its information technology and other systems, as well as those of third party providers and participants in the Company’s distribution channels, have been and will likely continue to be subject to physical or electronic break-ins, unauthorized tampering, security breaches or other cyber-attacks, resulting in a failure to maintain the security, confidentiality, integrity, or privacy of sensitive data, including personal information relating to customers and prospective customers, or in the misappropriation of the Company's intellectual property or proprietary information.

From time to time, the Company, its third party providers and participants in the Company’s distribution channels have experienced and will likely continue to experience such events. Although the minor data leakage issues the Company has experienced to date have not had a material effect on its business, there is no assurance that the Company's security systems or processes will prevent or mitigate future break-ins, tampering, security breaches or other cyber-attacks. Interruption in telecommunication, information technology and other operational systems, or a failure to maintain the security, confidentiality or privacy of sensitive data residing on such systems, whether due to actions by the Company or others, including third party providers and participants in the company’s distribution channels, could delay or disrupt the Company's ability to do business and service its customers, seriously harm the Company's brand and reputation as well as the Company's ability to compete effectively, subject it to regulatory sanctions and other claims, lead to a loss of customers and revenues and otherwise adversely affect the Company's business. In addition, the costs to address or remediate system interruptions or security threats and vulnerabilities, whether before or after an incident, could be significant.

While the Company continues to invest in the infrastructure of its data security programs, the Company, as well as its third party providers and participants in the Company’s distribution channels, have been, and will likely continue to be, the target of unauthorized access, social engineering, phishing, cyber-attacks, web application attacks, computer viruses or other malicious codes, or other computer-related penetrations. Although the Company attempts to manage its exposure to such events through the purchase of cyber liability insurance, such events are inherently unpredictable and insurance may not be sufficient to protect the Company against all losses. As a result, events such as these could adversely affect the Company's financial condition or results of operation.

If the Company fails to comply with restrictions on customer privacy and information security, including taking steps to ensure that its third-party service providers and business associates who access, store, process or transmit sensitive customer information maintain its security, integrity, confidentiality and availability, the Company's reputation and business operations could be materially adversely affected.

The collection, maintenance, use, protection, disclosure and disposal of individually identifiable data by the Company's businesses are regulated at the international, federal and state levels. These laws and rules are subject to change by legislation or administrative or judicial interpretation. Various state laws address the unauthorized access and acquisition of personal information and the use and disclosure of individually identifiable health data to the extent they are more restrictive than those contained in the privacy and security provisions in the federal Gramm-Leach-Bliley Act of 1999 (GLBA) and in the Health Insurance Portability and Accountability Act of 1996 (HIPAA). HIPAA also requires that the Company imposes privacy and security requirements on its business associates (as such term is defined in the HIPAA regulations).With regard to personal information obtained from policyholders, the insured, or others, Aflac Japan is regulated in Japan by the Act on the Protection of Personal Information (APPI) and guidelines issued by FSA and other governmental authorities.

The Company relies on third parties, and in some cases subcontractors, to provide information technology and data services. It also relies on various parties in its distribution channels including agencies, banks and Japan Post in Japan, as well as sales associates and brokers in the United States, to provide services to prospective and existing customers. Although

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the Company provides for appropriate protections through its contracts and performs information security risk assessments of its third-party service providers and business associates, the Company still has limited control over their actions and practices. In addition, despite the security measures the Company has in place to ensure compliance with applicable laws and rules, the Company's facilities and systems, and those of the Company's third-party providers and participants in its distribution channels may be vulnerable to security breaches, acts of vandalism or theft, computer viruses, misplaced or lost data, programming and/or human errors or other similar events. From time to time, the Company, its third party providers and participants in the Company’s distribution channels have experienced and will likely continue to experience such events. In such cases, notification to affected individuals, state and federal regulators, state attorneys general and media may be required, depending upon the number of affected individuals and whether personal information including health or financial data was subject to unauthorized access.

The U.S. Congress and many states are considering new privacy and security requirements that would apply to the Company's business. Compliance with new privacy and security laws, requirements, and new regulations may result in cost increases due to necessary systems changes, new limitations or constraints on the Company's business models, the development of new administrative processes, and the effects of potential noncompliance by the Company's business associates. They also may impose further restrictions on the Company's collection, disclosure and use of customer identifiable data that are housed in one or more of the Company's administrative databases. Noncompliance with any privacy laws or any security breach involving the misappropriation, loss, theft or other unauthorized disclosure of sensitive or confidential customer information, whether by the Company or by one of its third parties, could have a material adverse effect on the Company's business, reputation, brand and results of operations, including: material fines and penalties; compensatory, special, punitive and statutory damages; consent orders regarding the Company's privacy and security practices; adverse actions against the Company's licenses to do business; and injunctive relief.

In addition, under Japanese laws and regulations, including the APPI, if a leak or loss of personal information by Aflac Japan or its business associates should occur, depending on factors such as the volume of personal data involved and the likelihood of other secondary damage, Aflac Japan may be required to file reports to the FSA; issue public releases explaining such incident to the public; or become subject to an FSA business improvement order, which could pose a risk to the Company's reputation.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Purchases of Equity Securities

During the first three months of 2018, the Company repurchased shares of its common stock as follows:

Period	Total Number of Shares Purchased		Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum     Number of     Shares that     May Yet Be     Purchased     Under the     Plans or     Programs
January 1 - January 31	2,370,284		$	44.31	2,370,284	95,626,488
February 1 - February 28	2,349,600		44.70		2,349,600	93,276,888
March 1 - March 31	1,937,161		44.49		1,920,400	91,356,488
Total	6,657,045	(2)	$	44.50	6,640,284	91,356,488	(1)

⁽¹⁾The total remaining shares available for purchase at March 31, 2018, consisted of 11,356,488 shares related to an 80,000,000 share repurchase authorization by the board of directors announced in 2015 and 80,000,000 shares related to an 80,000,000 share repurchase authorization by the board of directors announced in 2017.

⁽²⁾During the first three months of 2018, 16,761 shares were purchased in connection with income tax withholding obligations related to the vesting of restricted-share-based awards during the period.

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Item 6. Exhibits

(a)	EXHIBIT INDEX
	3.0	-	Articles of Incorporation, as amended – incorporated by reference from Form 10-Q for June 30, 2008, Exhibit 3.0 (File No. 001-07434).
	3.1	-	Bylaws of the Corporation, as amended and restated – incorporated by reference from Form 8-K dated November 10, 2015, Exhibit 3.1 (File No. 001-07434).
	4.0	-	There are no instruments with respect to long-term debt not being registered in which the total amount of securities authorized exceeds 10% of the total assets of Aflac Incorporated and its subsidiaries on a consolidated basis. We agree to furnish a copy of any long-term debt instrument to the Securities and Exchange Commission upon request.
	4.1	-	Indenture, dated as of May 21, 2009, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee – incorporated by reference from Form 8-K dated May 21, 2009, Exhibit 4.1 (File No. 001-07434).
	4.2	-	Second Supplemental Indenture, dated as of December 17, 2009, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 6.900% Senior Note due 2039) – incorporated by reference from Form 8-K dated December 14, 2009, Exhibit 4.1 (File No. 001-07434).
	4.3	-	Third Supplemental Indenture, dated as of August 9, 2010, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 6.45% Senior Note due 2040) - incorporated by reference from Form 8-K dated August 4, 2010, Exhibit 4.1 (File No. 001-07434).
	4.4	-	Fifth Supplemental Indenture, dated as of February 10, 2012, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 2.65% Senior Note due 2017) - incorporated by reference from Form 8-K dated February 8, 2012, Exhibit 4.1 (File No. 001-07434).
	4.5	-	Sixth Supplemental Indenture, dated as of February 10, 2012, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 4.00% Senior Note due 2022) - incorporated by reference from Form 8-K dated February 8, 2012, Exhibit 4.2 (File No. 001-07434).
	4.6	-	Seventh Supplemental Indenture, dated as of July 31, 2012, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 2.65% Senior Note due 2017) - incorporated by reference from Form 8-K dated July 27, 2012, Exhibit 4.1 (File No. 001-07434).
	4.7	-	Eighth Supplemental Indenture, dated as of June 10, 2013, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 3.625% Senior Note due 2023) - incorporated by reference from Form 8-K dated June 10, 2013, Exhibit 4.1 (File No. 001-07434).
	4.8	-	Ninth Supplemental Indenture, dated as of November 7, 2014, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 3.625% Senior Note due 2024) - incorporated by reference from Form 8-K dated November 4, 2014, Exhibit 4.1 (File No. 001-07434).
	4.9	-	Tenth Supplemental Indenture, dated as of March 12, 2015, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 2.40% Senior Note due 2020) - incorporated by reference from Form 8-K dated March 9, 2015, Exhibit 4.1 (File No. 001-07434).
	4.10	-	Eleventh Supplemental Indenture, dated as of March 12, 2015, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 3.25% Senior Note due 2025) - incorporated by reference from Form 8-K dated March 9, 2015, Exhibit 4.2 (File No. 001-07434).
	4.11	-	Twelfth Supplemental Indenture, dated as of September 19, 2016, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 2.875% Senior Note due 2026) - incorporated by reference from Form 8-K dated September 19, 2016, Exhibit 4.1 (File No. 001-07434).
	4.12	-	Thirteenth Supplemental Indenture, dated as of September 19, 2016, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 4.000% Senior Note due 2046) - incorporated by reference from Form 8-K dated September 19, 2016, Exhibit 4.2 (File No. 001-07434).
	4.13	-	Fourteenth Supplemental Indenture, dated as of January 25, 2017, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of .932% Senior Note due 2027) – incorporated by reference from Form 8-K dated January 25, 2017, Exhibit 4.1 (File No. 001-07434).

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4.14	-	Subordinated Indenture, dated as of September 26, 2012, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee - incorporated by reference from Form 8-K dated September 26, 2012, Exhibit 4.1 (File No. 001-07434).
4.15	-	First Supplemental Indenture, dated as of September 26, 2012, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 5.50% Subordinated Debenture due 2052) - incorporated by reference from Form 8-K dated September 26, 2012, Exhibit 4.2 (File No. 001-07434).
4.16	-	Second Supplemental Indenture, dated as of October 23, 2017, between Aflac Incorporated and The Bank of New York Mellon Trust Company, N.A., as trustee (including the form of 2.108% Subordinated Debenture due 2047) - incorporated by reference from Form 8-K dated October 23, 2017, Exhibit 4.1 (File No. 001-07434).
10.1	-	Notice of time based restricted stock unit and restricted stock unit agreement under the 2004 Aflac Incorporated Long-Term Incentive Plan, as amended and restated March 14, 2012.
10.2	-	2017 Notice of performance based restricted stock and restricted stock award agreement under the 2004 Aflac Incorporated Long-Term Incentive Plan, as amended and restated March 14, 2012.
10.3	-	Notice of time based restricted stock unit and restricted stock unit agreement under the Aflac Incorporated Long-Term Incentive Plan, as amended and restated February 14, 2017.
10.4	-	2018 Notice of performance based restricted stock and restricted stock award agreement under the Aflac Incorporated Long-Term Incentive Plan, as amended and restated February 14, 2017.
10.5	-	Aflac Incorporated Employment Agreement with Charles D. Lake II, dated January 1, 2018.
10.6	-	Aflac Incorporated Employment Agreement with Audrey Boone Tillman, dated June 11, 2015.
15	-	Letter from KPMG LLP regarding unaudited interim financial information.
31.1	-	Certification of CEO dated May 3, 2018, required by Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934.
31.2	-	Certification of CFO dated May 3, 2018, required by Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934.
32	-	Certification of CEO and CFO dated May 3, 2018, pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	-	XBRL Instance Document.(1)
101.SCH	-	XBRL Taxonomy Extension Schema.
101.CAL	-	XBRL Taxonomy Extension Calculation Linkbase.
101.DEF	-	XBRL Taxonomy Extension Definition Linkbase.
101.LAB	-	XBRL Taxonomy Extension Label Linkbase.
101.PRE	-	XBRL Taxonomy Extension Presentation Linkbase.

(1)

Includes the following materials contained in this Quarterly Report on Form 10-Q for the period ended March 31, 2018, formatted in XBRL (eXtensible Business Reporting Language): (i) Consolidated Statements of Earnings, (ii) Consolidated Statements of Comprehensive Income (Loss), (iii) Consolidated Balance Sheets, (iv) Consolidated Statements of Shareholders’ Equity, (v) Consolidated Statements of Cash Flows, (vi) Notes to the Consolidated Financial Statements

*

Management contract or compensatory plan or arrangement required to be filed as an exhibit pursuant to Item 6 of this report

94

SIGNATURES

Pursuant to the requirements 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.

	Aflac Incorporated
May 3, 2018	/s/ Frederick J. Crawford
	(Frederick J. Crawford)
	Executive Vice President, Chief Financial Officer
May 3, 2018	/s/ June Howard
	(June Howard)
	Senior Vice President, Financial Services; Chief Accounting Officer

95

EX-10.1

Aflac Incorporated 1st Quarter 2018 10-Q

Exhibit 10.1

NOTICE OF GRANT OF TIME BASED	AFLAC INCORPORATED
RESTRICTED STOCK UNIT AND	Worldwide Headquarters
RESTRICTED STOCK UNIT AGREEMENT	1932 Wynnton Road
	Columbus, Georgia 31999

%%FIRST_NAME%-% %%MIDDLE_NAME%-% %%LAST_NAME%-%	Option Number:	%OPTION_NUMBER%-%
%%ADDRESS_LINE_1%-% %%ADDRESS_LINE_2%-% %%ADDRESS_LINE_3%-% %%CITY%-%, %%STATE%-% %%ZIPCODE%-%	Plan:	%%EQUITY_PLAN%-%

____________________________________________________________________________________________

Effective %%OPTION_DATE,’MM/DD/YYYY’%-%, you have been granted an award of

%%TOTAL_SHARES_GRANTED,'999,999,999'%-% shares of Aflac Incorporated (the Company) common stock.

These award shares are restricted until the dates shown below.

Shares	Full Vest
%%SHARES_PERIOD1,'999,999,999'%-%	%%VEST_DATE_PERIOD1,'MM/DD/YYYY'%-%
%%SHARES_PERIOD2,'999,999,999'%-%	%%VEST_DATE_PERIOD2,'MM/DD/YYYY'%-%
%%SHARES_PERIOD3,'999,999,999'%-%	%%VEST_DATE_PERIOD3,'MM/DD/YYYY'%-%

Summary of Award Terms:

Dividends are paid in the form of shares rather than cash. The number of Stock Units shall be increased by the number of shares that would have been received as a dividend had the Stock Units been outstanding shares. Additional Stock Units credited under the Section shall vest or be forfeited, and shares shall be delivered to participants, at the same time as the Stock Units to which they relate.

By your acceptance of the terms through ETrade.com and the Company's signature below, you and the Company agree that this award is granted under and governed by the terms and conditions of the Company's 2004 Long-Term Incentive Plan (as Amended and Restated March 14, 2012) and the Restricted Stock Award Agreement relating to this award, which is attached to and made a part of this document.

/s/ Dan Amos

By: Daniel P. Amos

Aflac Incorporated

EMPLOYEE RESTRICTED STOCK UNIT AWARD AGREEMENT

AFLAC INCORPORATED

Columbus, Georgia 31999

(hereinafter called “the Company”)

%%FIRST_NAME%-% %%MIDDLE_NAME%-% %%LAST_NAME%-%

This Employee Restricted Stock Unit Award Agreement (the “Agreement”) is made effective as of %%OPTION_DATE,’MM/DD/YYYY’%-%, by and between the “Company” and %%FIRST_NAME%-% %%MIDDLE_NAME%-% %%LAST_NAME%-% (the “Participant”), subject to the terms and conditions of this Agreement, the attached Notice of Grant of Restricted Stock Units (the “Notice of Grant”), which forms a part hereof, and the Aflac Incorporated 2004 Long-Term Incentive Plan (as Amended and Restated March 14, 2012) (the “Plan”).

A. Award. The Company hereby grants to the Participant an Award of

%%TOTAL_SHARES_GRANTED,'999,999,999'%-% Restricted Stock Units (“Stock Units”), each representing the right to receive a share of Aflac Incorporated Common Stock, par value $.10 per share (a “share”), subject to the terms and conditions set forth herein and in the Plan.

B. Forfeiture. Except as otherwise provided in Paragraph C, below, upon termination of the Participant’s employment with the Company and all of its Affiliates, any Stock Units which shall not already have vested pursuant to Paragraph C, below, or as otherwise provided in the Plan, shall be immediately forfeited by the Participant. In the case of a Participant who served as a non-employee sales associate of an Affiliate of the Company immediately before becoming an employee, if such Participant voluntarily terminates employment with the Company or an Affiliate but continues immediately thereafter to perform bona fide services for an Affiliate as a sales associate, the Participant shall be treated as continuing employment with the Company or an Affiliate for purposes of this Agreement. If the Committee or its delegate determines, in its sole discretion, that such a Participant is no longer providing bona fide services to an Affiliate as a sales associate, the Participant shall be deemed to have terminated employment for purposes of this Agreement on the date as of which such services are determined to have ceased. The Committee may require the Participant to provide such evidence of continuing services as it deems appropriate. The Committee may establish policies and procedures to be followed by the Committee or its delegate in determining whether a Participant is providing bona fide services as a sales associate, and such policies (including any amendments or modifications thereto) shall be considered part of this Agreement and shall be binding on the Participant.

C. Vesting. The Stock Units shall vest on one or more calendar dates as set forth in the Notice of Grant; provided that upon the death or disability of the Participant while employed by the Company or an Affiliate, all outstanding Stock Units shall become immediately fully vested. For the purposes of this Paragraph C, “Disability” means a physical or mental condition that qualifies the Grantee for long-term disability benefits under a long-term disability plan maintained by the Company or an Affiliate employing the Grantee.

D. Delivery of Shares. Within 74 days of the calendar vesting date set forth in the Notice of Grant, the Company shall deliver a number of shares equal to the number of vested shares. In the event that any Stock Units vest prior to the applicable calendar vesting date set forth in the Notice of Grant due to the Participant’s disability or voluntary retirement after attaining age 60, the shares subject to such Stock Units shall not be delivered to the Participant until the applicable calendar vesting date. Notwithstanding the foregoing provisions of this Paragraph D, if any Restricted Stock Units become vested upon a Participant’s death, or if the Participant dies after becoming vested in Stock Units due to retirement or disability, shares

in respect of such Stock Unit shall be delivered to the Participant’s beneficiary within 74 days after the Participant’s death.

E. Dividends. Dividends are paid in the form of shares rather than cash, The number of Stock Units shall be increased by the number of shares that would have been received as a dividend had the Stock Units been outstanding shares. Additional Stock Units credited under the Section shall vest or be forfeited, and shares shall be delivered to Participants, at the same time as the Stock Units to which they relate.

F. Miscellaneous.

1. No Rights as a Stockholder. Prior to delivery of shares pursuant to Paragraph E, the Participant shall have no rights of a stockholder of the Company, including the right to vote such shares or to receive any cash dividends.

2. No Additional Rights. Neither this Agreement nor any of the transactions contemplated hereby shall affect any right of the Participant to continue as an employee of the Company or any Affiliate or otherwise to provide services to the Company or any Affiliate or any of the terms or conditions of any such service.

3. Restriction on Transfer. Except as otherwise provided in the Plan, the Participant may not transfer or assign any of the Participant’s rights with respect to this Award, whether voluntary or involuntary, by operation of law or otherwise. Unless the Committee determines otherwise, if a Participant makes any attempt to transfer or assign the rights with respect to this Award, the Award shall be immediately forfeited by the Participant without consideration at any time.

4. Notices. All notices or other communications hereunder shall be in writing and shall be deemed to have been duly given (a) when delivered personally, (b) by mail, or (c) by electronic communication. The addresses for such notices shall be set out in the Notice of Grant. Either party hereto may change such party’s address for notices by notice duly given pursuant hereto.

5. Securities Laws Requirements. The Company shall not be obligated to transfer any shares to the Participant free of restrictions on transfer if such transfer, in the opinion of counsel for the Company, would violate the Securities Act of 1933, as amended (or any other federal or state statutes having similar requirements as may be in effect at the time transfer otherwise would be made).

6. Failure to Enforce Not a Waiver. The failure of the Company to enforce at any time any provision of this Agreement shall in no way be construed to be a waiver of such provision or of any other provision hereof.

7. Incorporation of Plan. The Plan is hereby incorporated by reference into this Agreement and made a part hereof, and the shares and this Agreement shall be subject to all terms and conditions of the Plan.

8. Amendments. The Committee may amend the terms of this Agreement prospectively or retroactively at any time, but no such amendment shall impair the rights of the Participant hereunder without the Participant’s consent.

9. Survival of Terms. This Agreement shall apply to and bind the Participant and the Company and their respective permitted assignees and transferees, heirs, legatees, executors, administrators and legal successors.

10. Authority of the Board. The Committee shall have full authority to interpret and construe the terms of the Plan and this Agreement. The determination of the Committee as to any such matter of interpretation or construction shall be final, binding and conclusive.

2

11. Representations. The Participant hereby acknowledges that the Participant has reviewed with the Participant’s own tax advisors the Federal, state, local and foreign tax consequences of the transactions contemplated by this Agreement. The Participant is relying solely on such advisors and not on any statements or representations of the Company or any of its agents. The Participant understands that the Participant (and not the Company) shall be responsible for any tax liability that may arise as a result of the transactions contemplated by this Agreement.

12. Acceptance. The Participant hereby acknowledges receipt of a copy of the Plan and this Agreement and that the Participant has read and understands the terms and provisions thereof, and accepts the shares subject to all the terms and conditions of the Plan and this Agreement. The Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Committee upon any questions arising under this Agreement.

13. Authorization. The Participant hereby authorizes and directs the Secretary of the Company, or such other person designated by the Company, to take such steps as may be necessary to carry out any of the transactions contemplated by this Agreement.

14. Withholding Requirements. The Company’s obligations under this Agreement shall be subject to all applicable tax and other withholding requirements, and the Company shall, to the extent permitted by law, have the right to deduct any withholding amounts from any payment or transfer of any kind otherwise due to the Participant (including the shares to be delivered upon vesting of Stock Units).

15. Certain Defined Terms. Capitalized terms used but not defined herein shall have the meaning ascribed to them in the Plan.

16. Interpretation. Headings to provisions of this Agreement are intended for convenience of reference only and shall have no effect on the interpretation of this Agreement.

17. Severability. If any provision of this Agreement is held to be invalid or unenforceable, the other provisions of this Agreement shall not be affected but shall be applied as if the invalid or unenforceable provision had not been included in this Agreement.

18. Applicable Law. This Agreement shall be governed by, and construed in accordance with, the laws of the State of Georgia, except to the extent that federal law is controlling.

AFLAC INCORPORATED

By: Daniel P. Amos

Title: Chairman and Chief Executive Officer

Acknowledgment:

The Participant acknowledges by his or her acceptance within ETrade.comthat the Participant has received a copy of the Aflac Incorporated 2004 Long-Term Incentive Plan (as Amended and Restated March 14, 2012) Prospectus, has read the same, and is familiar with its provisions and understands and agrees that they, as well as the terms stated herein and upon the attached notice, are part of this Agreement.

3

EX-10.2

Aflac Incorporated 1st Quarter 2018 10-Q

Exhibit 10.2

/s/ Dan Amos

By: Daniel P. Amos

Aflac Incorporated

EX-10.3

Aflac Incorporated 1st Quarter 2018 10-Q

Exhibit 10.3

NOTICE OF GRANT OF TIME BASED	AFLAC INCORPORATED
RESTRICTED STOCK UNIT AND	Worldwide Headquarters
RESTRICTED STOCK UNIT AGREEMENT	1932 Wynnton Road
	Columbus, Georgia 31999

%%FIRST_NAME%-% %%MIDDLE_NAME%-% %%LAST_NAME%-%	Option Number:	%OPTION_NUMBER%-%
%%ADDRESS_LINE_1%-% %%ADDRESS_LINE_2%-% %%ADDRESS_LINE_3%-% %%CITY%-%, %%STATE%-% %%ZIPCODE%-%	Plan:	%%EQUITY_PLAN%-%

____________________________________________________________________________________________

Effective %%OPTION_DATE,’MM/DD/YYYY’%-%, you have been granted an award of

%%TOTAL_SHARES_GRANTED,'999,999,999'%-% shares of Aflac Incorporated (the Company) common stock.

These award shares are restricted until the dates shown below.

Shares	Full Vest
%%SHARES_PERIOD1,'999,999,999'%-%	%%VEST_DATE_PERIOD1,'MM/DD/YYYY'%-%
%%SHARES_PERIOD2,'999,999,999'%-%	%%VEST_DATE_PERIOD2,'MM/DD/YYYY'%-%
%%SHARES_PERIOD3,'999,999,999'%-%	%%VEST_DATE_PERIOD3,'MM/DD/YYYY'%-%

Summary of Award Terms:

Dividends are paid in the form of shares rather than cash. The number of Stock Units shall be increased by the number of shares that would have been received as a dividend had the Stock Units been outstanding shares. Additional Stock Units credited under the Section shall vest or be forfeited, and shares shall be delivered to participants, at the same time as the Stock Units to which they relate.

By your acceptance of the terms through ETrade.com and the Company's signature below, you and the Company agree that this award is granted under and governed by the terms and conditions of the Company's Long-Term Incentive Plan (as Amended and Restated February 14, 2017) and the Restricted Stock Award Agreement relating to this award, which is attached to and made a part of this document.

/s/ Dan Amos

By: Daniel P. Amos

Aflac Incorporated

EMPLOYEE RESTRICTED STOCK UNIT AWARD AGREEMENT

AFLAC INCORPORATED

Columbus, Georgia 31999

(hereinafter called “the Company”)

%%FIRST_NAME%-% %%MIDDLE_NAME%-% %%LAST_NAME%-%

This Employee Restricted Stock Unit Award Agreement (the “Agreement”) is made effective as of %%OPTION_DATE,’MM/DD/YYYY’%-%, by and between the “Company” and %%FIRST_NAME%-% %%MIDDLE_NAME%-% %%LAST_NAME%-% (the “Participant”), subject to the terms and conditions of this Agreement, the attached Notice of Grant of Restricted Stock Units (the “Notice of Grant”), which forms a part hereof, and the Aflac Incorporated Long-Term Incentive Plan (as Amended and Restated February 14, 2017) (the “Plan”).

A. Award. The Company hereby grants to the Participant an Award of

%%TOTAL_SHARES_GRANTED,'999,999,999'%-% Restricted Stock Units (“Stock Units”), each representing the right to receive a share of Aflac Incorporated Common Stock, par value $.10 per share (a “share”), subject to the terms and conditions set forth herein and in the Plan.

B. Forfeiture. Except as otherwise provided in Paragraph C, below, upon termination of the Participant’s employment with the Company and all of its Affiliates, any Stock Units which shall not already have vested pursuant to Paragraph C, below, or as otherwise provided in the Plan, shall be immediately forfeited by the Participant. In the case of a Participant who served as a non-employee sales associate of an Affiliate of the Company immediately before becoming an employee, if such Participant voluntarily terminates employment with the Company or an Affiliate but continues immediately thereafter to perform bona fide services for an Affiliate as a sales associate, the Participant shall be treated as continuing employment with the Company or an Affiliate for purposes of this Agreement. If the Committee or its delegate determines, in its sole discretion, that such a Participant is no longer providing bona fide services to an Affiliate as a sales associate, the Participant shall be deemed to have terminated employment for purposes of this Agreement on the date as of which such services are determined to have ceased. The Committee may require the Participant to provide such evidence of continuing services as it deems appropriate. The Committee may establish policies and procedures to be followed by the Committee or its delegate in determining whether a Participant is providing bona fide services as a sales associate, and such policies (including any amendments or modifications thereto) shall be considered part of this Agreement and shall be binding on the Participant.

C. Vesting. The Stock Units shall vest on one or more calendar dates as set forth in the Notice of Grant; provided that upon the death or disability of the Participant while employed by the Company or an Affiliate, all outstanding Stock Units shall become immediately fully vested. For the purposes of this Paragraph C, “Disability” means a physical or mental condition that qualifies the Grantee for long-term disability benefits under a long-term disability plan maintained by the Company or an Affiliate employing the Grantee.

D. Delivery of Shares. Within 74 days of the calendar vesting date set forth in the Notice of Grant, the Company shall deliver a number of shares equal to the number of vested shares. In the event that any Stock Units vest prior to the applicable calendar vesting date set forth in the Notice of Grant due to the Participant’s disability or voluntary retirement after attaining age 60, the shares subject to such Stock Units shall not be delivered to the Participant until the applicable calendar vesting date. Notwithstanding the foregoing provisions of this Paragraph D, if any Restricted Stock Units become vested upon a Participant’s death, or if the Participant dies after becoming vested in Stock Units due to retirement or disability, shares

in respect of such Stock Unit shall be delivered to the Participant’s beneficiary within 74 days after the Participant’s death.

E. Dividends. Dividends are paid in the form of shares rather than cash, The number of Stock Units shall be increased by the number of shares that would have been received as a dividend had the Stock Units been outstanding shares. Additional Stock Units credited under the Section shall vest or be forfeited, and shares shall be delivered to Participants, at the same time as the Stock Units to which they relate.

F. Miscellaneous.

1. No Rights as a Stockholder. Prior to delivery of shares pursuant to Paragraph E, the Participant shall have no rights of a stockholder of the Company, including the right to vote such shares or to receive any cash dividends.

2. No Additional Rights. Neither this Agreement nor any of the transactions contemplated hereby shall affect any right of the Participant to continue as an employee of the Company or any Affiliate or otherwise to provide services to the Company or any Affiliate or any of the terms or conditions of any such service.

3. Restriction on Transfer. Except as otherwise provided in the Plan, the Participant may not transfer or assign any of the Participant’s rights with respect to this Award, whether voluntary or involuntary, by operation of law or otherwise. Unless the Committee determines otherwise, if a Participant makes any attempt to transfer or assign the rights with respect to this Award, the Award shall be immediately forfeited by the Participant without consideration at any time.

4. Notices. All notices or other communications hereunder shall be in writing and shall be deemed to have been duly given (a) when delivered personally, (b) by mail, or (c) by electronic communication. The addresses for such notices shall be set out in the Notice of Grant. Either party hereto may change such party’s address for notices by notice duly given pursuant hereto.

5. Securities Laws Requirements. The Company shall not be obligated to transfer any shares to the Participant free of restrictions on transfer if such transfer, in the opinion of counsel for the Company, would violate the Securities Act of 1933, as amended (or any other federal or state statutes having similar requirements as may be in effect at the time transfer otherwise would be made).

6. Failure to Enforce Not a Waiver. The failure of the Company to enforce at any time any provision of this Agreement shall in no way be construed to be a waiver of such provision or of any other provision hereof.

7. Incorporation of Plan. The Plan is hereby incorporated by reference into this Agreement and made a part hereof, and the shares and this Agreement shall be subject to all terms and conditions of the Plan.

8. Amendments. The Committee may amend the terms of this Agreement prospectively or retroactively at any time, but no such amendment shall impair the rights of the Participant hereunder without the Participant’s consent.

9. Survival of Terms. This Agreement shall apply to and bind the Participant and the Company and their respective permitted assignees and transferees, heirs, legatees, executors, administrators and legal successors.

10. Authority of the Board. The Committee shall have full authority to interpret and construe the terms of the Plan and this Agreement. The determination of the Committee as to any such matter of interpretation or construction shall be final, binding and conclusive.

2

11. Representations. The Participant hereby acknowledges that the Participant has reviewed with the Participant’s own tax advisors the Federal, state, local and foreign tax consequences of the transactions contemplated by this Agreement. The Participant is relying solely on such advisors and not on any statements or representations of the Company or any of its agents. The Participant understands that the Participant (and not the Company) shall be responsible for any tax liability that may arise as a result of the transactions contemplated by this Agreement.

12. Acceptance. The Participant hereby acknowledges receipt of a copy of the Plan and this Agreement and that the Participant has read and understands the terms and provisions thereof, and accepts the shares subject to all the terms and conditions of the Plan and this Agreement. The Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Committee upon any questions arising under this Agreement.

13. Authorization. The Participant hereby authorizes and directs the Secretary of the Company, or such other person designated by the Company, to take such steps as may be necessary to carry out any of the transactions contemplated by this Agreement.

14. Withholding Requirements. The Company’s obligations under this Agreement shall be subject to all applicable tax and other withholding requirements, and the Company shall, to the extent permitted by law, have the right to deduct any withholding amounts from any payment or transfer of any kind otherwise due to the Participant (including the shares to be delivered upon vesting of Stock Units).

15. Certain Defined Terms. Capitalized terms used but not defined herein shall have the meaning ascribed to them in the Plan.

16. Interpretation. Headings to provisions of this Agreement are intended for convenience of reference only and shall have no effect on the interpretation of this Agreement.

17. Severability. If any provision of this Agreement is held to be invalid or unenforceable, the other provisions of this Agreement shall not be affected but shall be applied as if the invalid or unenforceable provision had not been included in this Agreement.

18. Applicable Law. This Agreement shall be governed by, and construed in accordance with, the laws of the State of Georgia, except to the extent that federal law is controlling.

AFLAC INCORPORATED

By: Daniel P. Amos

Title: Chairman and Chief Executive Officer

Acknowledgment:

The Participant acknowledges by his or her acceptance within ETrade.comthat the Participant has received a copy of the Aflac Incorporated Long-Term Incentive Plan (as Amended and Restated February 14, 2017) Prospectus, has read the same, and is familiar with its provisions and understands and agrees that they, as well as the terms stated herein and upon the attached notice, are part of this Agreement.

3

EX-10.4

Aflac Incorporated 1st Quarter 2018 10-Q

Exhibit 10.4

/s/ Dan Amos

By: Daniel P. Amos

Aflac Incorporated

EX-10.5

Aflac Incorporated 1st Quarter 2018 10-Q

Exhibit 10.5

STATE OF GEORGIA

COUNTY OF MUSCOGEE:

EMPLOYMENT AGREEMENT

THIS AGREEMENT, made and entered into as of the 1^st day of January, 2018, by and between AFLAC INCORPORATED, a Georgia corporation, hereinafter referred to as “Corporation” and CHARLES D. LAKE II, a resident of Japan, hereinafter referred to as “Employee;”

WITNESSETH THAT:

WHEREAS, Employee has been and currently is employed by American Family Life Assurance Company of Columbus (“Aflac”), a wholly-owned subsidiary of Corporation, and more specifically, Aflac’s Japan Branch, which is Corporation’s insurance operation in Japan; and

WHEREAS, Employee and Aflac’s Japan Branch (acting on behalf of Aflac) previously entered into an employment agreement dated August 1, 2013, as subsequently amended by an agreement dated August 9, 2017 (the “2013 Agreement”); and

WHEREAS, Corporation and Employee desire to enter into this new employment Agreement, which will replace and be in lieu of the 2013 Agreement; and

WHEREAS, on or about April 2, 2018 (the “Insurance Effective Date”), as part of a reorganization of Corporation’s insurance business operated through Aflac’s Japan Branch, the business and assets of Corporation’s insurance operation in Japan will be transferred to Japan Life Incorporation Preparation K.K. or its successor (“Aflac Japan”), and employees (including Employee) working in Corporation’s insurance operation in Japan operated through Aflac’s Japan Branch will become employees of Aflac Japan; and

WHEREAS, under this new Agreement during the period prior to the Insurance Effective Date, Employee will continue to serve as an employee of Aflac’s Japan Branch with the title of Chairman and Representative in Japan of Aflac Japan, and to serve as President of Aflac International; and

WHEREAS, under this new Agreement during the period commencing on and after the Insurance Effective Date, Employee will serve as an employee of Aflac Japan with the title of Chairman and Representative Director of Aflac Japan, and will continue to serve as President of Aflac International; and

WHEREAS, for purposes of this Agreement, prior to the Insurance Effective Date, “Japan Operation” shall mean Aflac’s Japan Branch; and commencing on and after the Insurance Effective Date, “Japan Operation” shall mean Aflac Japan, which shall own and operate Aflac’s insurance operation in Japan;

NOW, THEREFORE, the parties, for and in consideration of the mutual covenants and agreements hereinafter contained, do contract and agree as follows, to-wit:

1.    Purpose and employment. The purpose of this Agreement is to define the relationship between Corporation, as the parent company of Aflac and Aflac Japan, which shall cause Japan Operation to serve as the employer of Employee with the responsibilities and rights set forth in this Agreement; and Employee to serve as an employee of Japan Operation with the titles set forth in the preamble to this Agreement. For clarity, Japan Operation and not Corporation is the employer of Employee. This Agreement replaces and supersedes the 2013 Agreement.

2.    Duties and Location.

A.Duties. Employee agrees to provide executive management services to Japan Operation and with regard to the development and implementation of strategies to address initiatives in international affairs with the titles set forth in the preamble on a full-time and exclusive basis; provided, however, nothing shall preclude Employee from engaging in charitable and community affairs or managing his own or his family’s personal investments. Employee agrees to perform duties as the Representative in Japan for Aflac pursuant to that certain Power of Attorney between Aflac and Employee dated December 21, 2007, which may be subsequently amended.

B.Location. Employee’s principal place of employment shall be in Japan Operation’s office in Tokyo, Japan (or such other location determined by Japan Operation after consultation with Employee). Employee acknowledges that his duties and responsibilities shall require him to travel on business to the extent reasonably necessary to fully perform his duties and responsibilities hereunder.

3.    Performance. Employee agrees to devote all necessary time and his best efforts in the performance of his duties on behalf of Corporation and its subsidiaries (i) before the Insurance Effective Date, as Chairman and Representative in Japan of Aflac Japan; (ii) commencing on and after the Insurance Effective Date, as Chairman and Representative Director of Aflac Japan; and (iii) as President of Aflac International.

4.    Term. The term of employment under this Agreement shall begin January 1, 2018, and shall continue for a period of three (3) years until December 31, 2020, unless extended or sooner terminated as hereinafter provided. On an annual basis beginning effective January 1, 2019, the scheduled term of this Agreement shall be extended for successive one (1)-year periods unless written notice of termination is given prior to such annual date by one party to the other party that the Agreement will not be extended by its terms.

5.    Base salary. For all the services rendered by Employee, Japan Operation shall pay Employee a base salary of sixty-six million yen (¥66.0 million) per year commencing January 1, 2018, said salary to be payable in accordance with Japan Operation’s normal payroll procedures. Employee’s base salary may be increased annually during the term of this Agreement and any

extensions hereof as determined by the Compensation Committee of the Board of Directors of Corporation (the “Compensation Committee of the Board”).

6.    Documentation of increase in base salary. Any increase in base salary determined by the Compensation Committee of the Board under Paragraph 5 shall be documented in Corporation’s and/or Japan Operation’s records and communicated to Employee, as the Compensation Committee of the Board may determine.

7.    Management Incentive Plan. In addition to the base salary paid to Employee in accordance with Paragraph 5, Japan Operation shall for each calendar year of Employee’s employment by Japan Operation, beginning with the calendar year 2018, pay Employee, as performance bonus compensation, an amount determined each year under the current Aflac Incorporated Management Incentive Plan (i.e., short-term incentive program) with a target level based on at least one hundred percent (100%) of base salary. Nothing in this Paragraph shall preclude Employee from receiving additional discretionary bonuses approved by the Chief Executive Officer of Corporation (the “Corporation Chief Executive Officer”) or the Compensation Committee of the Board. Amounts payable to Employee under the Management Incentive Plan (or any successor or other executive bonus program) shall be payable in such manner, at such times and in such forms, as prescribed by the terms of the Management Incentive Plan (or successor or other program).

8.    Employee benefits.

A.Common benefits applicable to employees of Japan Operation in general. Employee shall be eligible to participate with other employees of Japan Operation in all employee benefit programs applicable generally to similarly-situated employees of Japan Operation, which may be authorized and adopted from time to time by Japan Operation, including without limitation: Aflac Japan’s insurance, Japanese social insurance plan (including Japanese public pension, Japanese national health insurance, medical reimbursement, and hospitalization and major medical benefits), and a group life insurance plan.

As provided under the “Agreement Between the United States and Japan on Social Security,” Japan Operation shall not make U.S. social security contributions for Employee as he will be enrolled in the Japanese social insurance system. In addition, Employee may participate in any Japan Operation retirement plan for which he is eligible. Employee shall not be eligible to actively participate in any of the following U.S. benefits: qualified pension plan; qualified 401(k) and profit sharing plans; nonqualified deferred compensation plan; nonqualified supplemental executive retirement plan; group health benefits; disability income or sick pay plan; accident and health plan (including medical reimbursement and hospitalization and major medical benefits); group life insurance plan; or any such other “fringe” or employee benefits as are provided to U.S. employees of Corporation and its subsidiaries.

B.Special benefits provided specifically to Employee. Japan Operation shall furnish to Employee the following “fringe” or employee benefits:

(1)company paid premiums for a life insurance policy totaling ten million dollars ($10 million) until retirement, plus a tax gross-up on annual premiums;

(2)reimbursement of expenses related to tax return preparation incurred by Employee in connection with his employment up to a maximum of $10,000 per year;

(3)a retirement benefit to Employee in the total amount of (i) one hundred percent (100%) of base salary as in effect at the time of such retirement, and (ii) twelve (12) multiplied by one month’s base salary as in effect at the time of such retirement. Payment of such total amount shall be made in a lump sum upon the day after the six (6)-month anniversary of his separation from service.

(4)the amounts payable under the Tax Equalization Transition Agreement, dated August 1, 2013, between Aflac Incorporated and Employee, with the last day of the term of this Agreement (plus all extensions thereto) constituting the “Termination Date” for purposes of Section 2 of said Tax Equalization Transition Agreement;

(5)Japan Operation shall furnish to Employee such other “fringe” or employee benefits as are provided to similarly-situated key executive employees of Japan Operation and such additional employee benefits which the Compensation Committee of the Board or the Corporation Chief Executive Officer shall determine to be appropriate to Employee’s duties and responsibilities, including, without limitation, reimbursement of legal and accounting expenses incurred by Employee in connection with the preparation of his employment or other agreements with Corporation and its subsidiaries and any expenses for legal, accounting or financial services incurred by Employee in connection with his employment.

Any reimbursements made pursuant to this Paragraph 8 shall be paid as soon as practicable but no later than ninety (90) days after Employee submits evidence of such expenses to Japan Operation (which payment date shall in no event be later than the last day of the calendar year following the calendar year in which the expense was incurred). The amount of such reimbursements or in-kind benefits provided during any calendar year shall not affect the amount of reimbursements or in-kind benefits provided in any other calendar year, and the right to any such benefits shall not be subject to liquidation or exchange for another benefit.

9.    Equity award plans. Employee shall be eligible to be awarded stock options, restricted stock awards, and other equity awards (collectively, “Equity Awards”) to purchase Corporation common stock under the Aflac Incorporated Long-Term Incentive Plans for selected key employees and directors during the term of this Agreement. The target level for these Equity Awards shall be based on at least two hundred percent (200%) of Employee’s base salary.

10.    Working facilities and expenses. Employee shall be provided with an office, books, periodicals, stenographic and technical help, ground and air transportation, and such other facilities, equipment, supplies and services suitable to his position and adequate for the performance of his duties. Japan Operation shall pay Employee’s fees and dues in such social and country clubs, civic clubs and business societies and associations as shall be appropriate in facilitating Employee’s job performance and in the best interest of Japan Operation. Japan Operation shall also pay all

appropriate business liability insurance and any business licenses and fees pertaining to the services rendered by Employee hereunder.

Employee is encouraged and is expected, from time to time, to incur reasonable expenses for promoting the business of Japan Operation and developing and implementing strategies to address initiatives in international affairs, including expenses for social and civic club memberships and participation, entertainment, travel and other activities associated with Employee’s duties. Subject to specific approval of the Corporation Chief Executive Officer, Employee may accept positions (e.g., officer, director, etc.) in organizations outside of Japan Operation consistent with Japan Operation’s external relations activities and with the development and implementation of strategies to address initiatives in international affairs. The cost of all such activities shall be the expenses of Japan Operation unless the Compensation Committee of the Board shall determine in advance that any such expense of Employee should be paid by Employee.

Any expense reimbursements made to satisfy the terms of this Paragraph 10 shall be paid as soon as practicable but no later than ninety (90) days after Employee submits evidence of such expenses to Japan Operation (which payment date shall in no event be later than the last day of the calendar year following the calendar year in which the expense was incurred). The amount of such reimbursements during any calendar year shall not affect the benefits provided in any other calendar year, and the right to any benefits under this Paragraph shall not be subject to liquidation or exchange for another benefit.

11.    Home Leave and Vacation. Employee shall continue to be entitled to his vacation time with pay during each calendar year in accordance with Japan Operation’s vacation policy for senior executive employees. In addition to his vacation time with pay during each calendar year in accordance with Japan Operation’s vacation policy for senior executive employees, Employee shall be entitled to up to four (4) weeks of home leave for a total of six (6) weeks of paid vacation time. Employee shall be entitled to such holidays as Japan Operation shall recognize for its employees generally. Employee acknowledges and agrees that he shall not be entitled to reimbursement for any home leave expenses.

12.    Sickness and total disability. Employee’s absence from work because of sickness or accident (not resulting in Employee becoming “totally disabled,” as that term is hereinafter defined) shall not result in any adjustment in Employee’s compensation or other benefits under this Agreement.

Should Employee become totally disabled as a result of sickness or accident and unable to adequately perform his regular duties prescribed under this Agreement, his base salary (which shall continue to be adjusted as provided for in Paragraph 5), together with incentive bonuses under the Aflac Incorporated Management Incentive Plan and his participation in Japan Operation’s employee benefit programs and retirement plan shall continue without reduction except as hereinafter provided, during the continuance of such disability for a period not exceeding the earlier of (1) the end of the term of this Agreement or any extension hereof, or (2) a period of one and one-half (1-1/2) years (547 calendar days) for each continuous disability. Payments pursuant to this Paragraph 12 shall be reduced by any amounts paid to Employee during any such period of

disability from time to time under any disability programs, plans or policies maintained by Japan Operation.

Should Employee’s total disability continue for a period beyond the end of the term of this Agreement or in excess of five hundred and forty-seven (547) calendar days, this Agreement shall, at the end of such period which first occurs, be automatically terminated. If, however, prior to such time, Employee’s total disability shall have ceased and he shall have resumed the adequate performance of his duties hereunder, this Agreement shall continue in full force and effect and Employee shall be entitled to continue his employment hereunder and to receive his full compensation and other benefits as though he had not been disabled; provided, however, unless Employee shall adequately perform his duties hereunder for a continuous period of at least sixty (60) calendar days following a period of total disability before Employee again becomes totally disabled, he shall not be entitled to start a new 547-day period under this Paragraph, but instead may only continue under the remaining portion of the original 547-day period of total disability. In the event Employee shall not adequately perform his duties hereunder for a continuous period of at least sixty (60) calendar days following a period of total disability, the running of the original 547-day period shall cease during the time of Employee’s adequate performance of his duties hereunder before Employee again becomes totally disabled.

For the purpose of this Agreement, the term “totally disabled” or “total disability” shall mean Employee’s inability to adequately perform his executive and management duties hereunder on account of accident or illness. It is understood that Employee’s occasional sickness or other incapacity of short duration may not result in his being or becoming “totally disabled;” however, such illness or incapacity could constitute Employee’s being or becoming “totally disabled” if such illness or incapacity is prolonged or recurring.

13.    Termination of employment.

A.    Termination by Japan Operation. The Corporation Chief Executive Officer may terminate this Agreement and Employee’s employment (the date thereof being referred to as his “Actual Termination Date”), at any time, with or without “good cause” (“good cause” being hereinafter defined), (i) immediately upon giving written notice to Employee of his termination for “good cause,” and (ii) by giving at least thirty (30) days’ written notice to Employee of Japan Operation’s intention to terminate Employee’s employment without “good cause;” provided, however, with respect to termination without “good cause,” Japan Operation may, at its selection, terminate Employee’s actual employment (so that Employee no longer renders services on behalf of Japan Operation) at any time during said thirty (30) day period; and,

(1)    In the event such termination is for “good cause,” Japan Operation shall be obligated only to pay Employee his base salary earned under Paragraph 5 through his Actual Termination Date.

For purposes of this Agreement (including Paragraph 18 hereof), “good cause” shall mean: that, in the sole discretion of the Corporation Chief Executive Officer, any of the following have occurred or exist: (i) the willful and deliberate failure of Employee to substantially perform his executive and management duties hereunder for reasons other than Employee’s sickness, injury or disability;

(ii) the willful and deliberate conduct by Employee, which results in substantial injury or damage to Corporation or its subsidiaries; or (iii) the conviction or plea of guilty by Employee of a felony crime. A termination of Employee for “good cause” based on clause (i) or (ii) of the preceding sentence will take effect immediately, unless the Corporation Chief Executive Officer, in his sole discretion, allows Employee a right to cure, in which case such termination for “good cause” will take effect thirty (30) days (or such shorter period as determined by the Corporation Chief Executive Officer) after Employee receives from Japan Operation written notice of its intent to terminate Employee’s employment and Japan Operation’s description of the alleged cause, unless Employee, in the opinion of the Corporation Chief Executive Officer, during such permitted cure period, makes significant progress toward remedying (and as soon as practicable thereafter, substantially completes the remedy of) the events or circumstances constituting “good cause;” a termination of Employee for “good cause” based on clause (iii) of the preceding sentence will take effect immediately.

(2)    In the event such termination is without “good cause,” as defined in subparagraph (1) of this Paragraph and, if applicable, subject to the terms of Paragraph 18, and if Employee timely signs and does not revoke a release as provided in subparagraph G of Paragraph 13, Japan Operation shall be obligated to:

(a)    upon Employee’s separation from service, pay Employee his base salary as provided for in Paragraph 5 of this Agreement up to the end of the scheduled term of this Agreement. Such amount, if any, payable under this subparagraph (a) for the period after his Actual Termination Date will be paid in accordance with the regular payroll schedule applicable to all other similarly-situated active executive employees of Japan Operation commencing with the next regularly scheduled payday, with any portion of such amount that is not exempt from Section 409A and that is payable within the six (6)-month period beginning on the date of his separation from service being paid in a lump sum upon the day after the six (6)-month anniversary of his separation from service;

(b)    pay Employee an amount equal to a portion of his performance bonus compensation as provided for in Paragraph 7 of this Agreement prorated based on the number of days through the end of the scheduled term of this Agreement. The amount of such bonus payable under this subparagraph (b), if any, will be paid to Employee pursuant to the terms and customary operations of the Management Incentive Program (or other applicable bonus program) except that Employee’s performance will be deemed to be at target while actual performance of Corporation and/or its subsidiaries will be applied; provided, if the scheduled term of this Agreement ends after the calendar year in which the notice of termination is given, (i) the bonus payment for the calendar year in which such notice is given (and any other full calendar year that ends before the scheduled term of this Agreement ends) will be paid without any proration; and (ii) the amount of the bonus payment for the calendar year in which the scheduled term of this Agreement ends will be calculated on a pro rata basis, using the number of days elapsed during such calendar year through the end of the scheduled term of this Agreement, and will be paid upon Employee’s separation

from service in a lump sum between January 1 and March 15, inclusive, of the calendar year following the calendar year in which the scheduled term of this Agreement ends or, if later and the payment is not exempt from Section 409A, upon the day after the six (6)-month anniversary of his separation from service;

(c)    continue to honor all Equity Awards, subject to the terms thereof, granted to Employee prior to the termination date stated in said written notice, all of said awards to be or become fully vested as of the termination date stated in said written notice; provided, any Equity Awards that vest based on performance will remain subject to the applicable performance criteria, and Employee’s performance will be deemed to be at target while actual vesting based on performance of Corporation and/or its subsidiaries will be applied in the manner and at the time provided in the agreements for such Equity Awards;

(d)    upon Employee’s separation from service, continue to pay or provide to Employee all of the retirement, health, life and disability benefits, as are provided for in this Agreement or under any programs, plans or policies covering Employee at the time of any such notice of termination, up to the end of the scheduled term of this Agreement.

Notwithstanding the foregoing, after Employee’s Actual Termination Date, Employee shall not actively participate in any fully insured benefit for which the insurer does not allow post-employment participation, or any other plan or benefit that Japan Operation or the third-party insurer of such benefit reasonably determines is not suitable or available for post-employment participation.

B.    Termination by Employee. Employee may terminate this Agreement at any time by giving at least sixty (60) days’ written notice to Japan Operation of his intention to terminate his employment;

(1)    in the event such termination by Employee shall be without “good reason” (as defined in Paragraph 18 hereof) and with a bona fide intent either (i) to retire or (ii) not to work in, or engage in a business or activity that would be in a Competing Business (as defined in Paragraph 15) that would violate the covenant against competition as set forth in Paragraph 15, Japan Operation shall be obligated to:

(a)    pay Employee his base salary due him under Paragraph 5 of this Agreement up to his Actual Termination Date;

(b)    pay Employee an amount equal to any performance bonus compensation due him under Paragraph 7 of this Agreement for the period ending on the earlier of (i) the termination date stated in such written notice, or (ii) the last day of the calendar year in which written notice of termination is provided. The amount of said bonus, if any, will be paid to Employee pursuant to the terms and customary operations of the Management Incentive Program (or other

applicable bonus program) except that Employee’s performance will be deemed at target while actual performance of Corporation and/or its subsidiaries will be applied, and will be calculated on a pro rata basis, using the number of days Employee was actually employed by the Japan Operation during the calendar year in which Employee provides such written notice of termination; and

(c)    continue to honor all Equity Awards, subject to the terms thereof, which have been granted to Employee and are fully vested prior to the termination date stated in said written notice.

(2)    In the event such termination by Employee shall be for “good reason” (as defined in Paragraph 18 hereof), and if Employee timely signs and does not revoke a release as provided in subparagraph G of Paragraph 13, Japan Operation shall be obligated to provide Employee with the payments, benefits and rights in a manner, at such times and in such forms as specified in subparagraphs A(2)(a)-(d) of this Paragraph 13.

(3)    In the event (i) such termination by Employee shall be without “good reason” (as defined in Paragraph 18 hereof) and (ii) Japan Operation determines that Employee’s post-employment activities violate, or will be in violation of, the Covenants of Paragraphs 15 and/or 16, then the Japan Operation shall not be obligated to make or provide any further payments or benefits to Employee under this Agreement except as herein provided in this subparagraph.

(a)    subject to Japan Operation’s rights under Paragraphs 15 and 16, the Japan Operation shall pay Employee his base salary due him under Paragraph 5 of this Agreement up to his Actual Termination Date;

(b)    Subject to Japan Operation’s rights under Paragraphs 15 and 16 hereof, Japan Operation shall continue to honor all Equity Awards, subject to the terms thereof, which have been granted to Employee and are fully vested prior to the termination date stated in said written notice.

C.    Termination while disabled. If Employee is totally disabled at the time any such notice of termination is given, then notwithstanding the provisions of this Paragraph 13, Japan Operation shall nevertheless continue to pay Employee, as his sole compensation hereunder, the compensation and other benefits for the remaining period of Employee’s total disability as provided for in Paragraph 12 hereinabove. It is understood that in no event shall such disabled Employee be entitled to compensation under this Paragraph 13 in addition to the continuation of his compensation under Paragraph 12.

D.    Cooperation After Notice of Termination. Following any such notice of termination, Employee shall fully cooperate with Japan Operation in all matters relating to the winding up of his pending work on behalf of the Japan Operation and the orderly transfer of any such pending work to other employees of Japan Operation as may be designated by the Corporation Chief Executive Officer; and to that end, Japan Operation shall be entitled to full-time services of Employee through his Actual Termination Date and such full-time or part-time services of Employee as Japan Operation may reasonably require during all or any part of the

sixty (60)-day period that follows his Actual Termination Date; provided, the parties acknowledge that, depending on the level of services so required, the provision of such services may delay the timing of Employee’s separation from service.

E.    Separation from Service. The term “separation from service” when used in this Agreement shall mean that Employee separates from service with Japan Operation and all affiliates, as defined in Code Section 409A and guidance issued thereunder (“Section 409A”). As a general overview of Section 409A’s definition of “separation from service”, an employee separates from service if the employee dies, retires, or otherwise has a termination of employment with all affiliates, determined in accordance with the following:

(1)    Leaves of Absence. The employment relationship is treated as continuing intact while the employee is on military leave, sick leave, or other bona fide leave of absence if the period of such leave does not exceed six (6) months, or, if longer, so long as the employee retains a right to reemployment with an affiliate under an applicable statute or by contract. A leave of absence constitutes a bona fide leave of absence only while there is a reasonable expectation that the employee will return to perform services for an affiliate. If the period of leave exceeds six (6) months and the employee does not retain a right to reemployment under an applicable statute or by contract, the employment relationship is deemed to terminate on the first date immediately following such six (6)-month period. Notwithstanding the foregoing, where a leave of absence is due to any medically determinable physical or mental impairment that can be expected to result in death or can be expected to last for a continuous period of not less than six (6) months, where such impairment causes the employee to be unable to perform the duties of his position of employment or any substantially similar position of employment, a twenty-nine (29)-month period of absence shall be substituted for such six (6)-month period.

(2)    Status Change. Generally, if an employee performs services both as an employee and an independent contractor, the employee must separate from service both as an employee and as an independent contractor pursuant to standards set forth in Treasury Regulations to be treated as having a separation from service. However, if an employee provides services to affiliates as an employee and as a member of the Board of Directors, the services provided as a director are not taken into account in determining whether the employee has a separation from service as an employee for purposes of this Agreement.

(3)    Termination of Employment. Whether a termination of employment has occurred is determined based on whether the facts and circumstances indicate that the employer and the employee reasonably anticipate that (A) no further services will be performed after a certain date, or (B) the level of bona fide services the employee will perform after such date (whether as an employee or as an independent contractor) will permanently decrease to less than fifty percent (50%) of the average level of bona fide services performed (whether as an employee or an independent contractor) over the immediately preceding thirty-six (36)-month period. Facts and circumstances to be considered in making this determination include, but are not limited to, whether the employee continues to be treated as an employee for other purposes (such as continuation of salary and participation in employee benefit programs), whether similarly-situated service providers have been treated consistently, and whether the employee is permitted, and realistically available, to perform services for other service recipients

in the same line of business. For periods during which an employee is on a paid bona fide leave of absence and has not otherwise terminated employment as described in subparagraph (1) above, for purposes of this subparagraph, the employee is treated as providing bona fide services at a level equal to the level of services that the employee would have been required to perform to receive the compensation paid with respect to such leave of absence. Periods during which an employee is on an unpaid bona fide leave of absence and has not otherwise terminated employment are disregarded for purposes of this subsection (including for purposes of determining the applicable thirty-six (36)-month period).

F.    Separate Payments. Each payment made to Employee pursuant to this Paragraph 13 or Paragraph 18 shall be treated as a separate payment for purposes of Code Section 409A.

G.    Release Requirement. As a condition to Employee receiving any pay or benefits under subparagraph A(2) or B(2) of this Paragraph 13 or under Paragraph 18 (as applicable), Employee must sign (and not revoke) a written release agreement (“Release”) containing any terms specified by Corporation for (i) Employee’s release of the Corporation and its subsidiaries from all claims arising from Employee’s employment or termination, (ii) Employee’s non-revocation of that release during the seven (7)-day period applicable to age-based claims, and (iii) Employee’s promise to comply with specified confidentiality, noncompetition and/or nonsolicitation provisions. Japan Operation will terminate Employee’s eligibility for severance pay and benefits if he fails to sign, if he revokes, or if he fails to follow the terms of this Release and if it is not signed and returned to Japan Operation within the earlier of (i) the deadline specified by Japan Operation, or (ii) sixty (60) days after Employee’s Actual Termination Date (or Termination Date for purposes of Paragraph 18). Employee must sign the Release after his Actual Termination Date (or Termination Date for purposes of Paragraph 18). In the event that any payment under subparagraph A(2) or B(2) of this Paragraph 13 or under Paragraph 18 (as applicable) is not exempt from Code Section 409A, the payment timing is based on the signing of this Release, and the period in which Employee could timely sign and return the release spans two (2) calendar years, such payment shall in all events be made in the second such calendar year. Notwithstanding the foregoing, if the payment timing of any portion of payments or benefits, which rely solely on the short-term deferral rule to be exempt from Code Section 409A, would be delayed beyond the short-term deferral rule period due to Employee’s late signing of the Release, such portion shall be forfeited.

14.    Death of Employee. In the event of Employee’s death during the term of this agreement or any extension hereof, this Agreement shall terminate immediately, and Employee’s estate shall be entitled to receive terminal pay in an amount equal to the amount of Employee’s base salary and any performance bonus compensation actually paid by Japan Operation to Employee during the last thirty-six (36) months of his life, said terminal pay to be paid in thirty-six (36) equal monthly installments beginning on the first day of the month next following the month during which Employee’s death occurs. If the Employee’s death occurs before he has been employed for thirty-six (36) months, the terminal pay shall be based on an amount equal to the Employee’s base salary and any performance bonus actually paid by Japan Operation to Employee during the period of his employment plus the amount of base salary and performance bonus the Employee would have been paid had he survived for the full initial thirty-six (36)-month period. Terminal pay as

herein provided for in this Paragraph shall be in addition to amounts otherwise receivable by Employee or his estate under this or any other agreements with Japan Operation or under any employee benefits or retirement plans established by the Japan Operation and in which Employee is participating at the time of his death. In addition, Japan Operation shall honor all Equity Awards, subject to the terms thereof, granted to Employee prior to his death; and Employee or his estate shall, if not otherwise vested, become fully vested in said options as of the date of Employee’s death.

15.    Covenants not to compete and not to disclose confidential information and trade secrets.

A.    Covenant against competition. During employment and for a 24-month period after Employee’s Actual Termination Date (or Termination Date for purposes of Paragraph 18) resulting from (i) Employee’s voluntary termination without “good reason” (as defined in Paragraph 18), or (ii) Japan Operation’s termination of Employee for “good cause” (as defined in Paragraph 13), Employee will not, on his own behalf, or on behalf of any other person or entity, compete with Corporation and its affiliated companies (the “Aflac Companies”) by providing in the Restricted Territory (as defined in subparagraph A(3) of this Paragraph 15) to any Competing Business (as defined in subparagraph A(2) of this Paragraph 15), services similar to those Employee provided to the Aflac Companies with respect to the Aflac Business (as defined in subparagraph A(1) of this Paragraph 15), in circumstances in which Employee’s responsibilities and duties are substantially similar to those performed by him during the 24-month period ending on his Actual Termination Date.

(1)“Aflac Business” means the Aflac Companies’ insurance company business, which the Aflac Companies operate throughout the United States (including the District of Columbia, Puerto Rico, the U.S. Virgin Islands and Guam) and throughout Japan, and which includes but is not limited to (i) the development, underwriting marketing, distribution and sale of individual and group voluntary insurance products, including .accident, cancer and other specified diseases, dental, hospital confinement indemnity, hospital confinement sickness indemnity, hospital intensive care, life, annuities, lump sum cancer, lump sum cancer critical illness, specified health event, short term disability and vision; (ii) the offering of un-reimbursed medical, dependent care, and transportation flexible spending accounts; and (iii) operating a private medical and insurance product exchange and similar enrollment services. “Aflac Business” will also include any additional insurance and reimbursement account products and services, which become part of the business conducted by the Aflac Companies, whether through acquisition and/or development, and in which or to which Employee has had direct exposure in \ position with the Aflac Companies. Similarly, “Aflac Business” will not include any business operation, which formerly was part of the business conducted by the Aflac Companies and which ceased being a part thereof due to divestiture or discontinuation of that part of the business.

(2)“Competing Business” means any person, concern or entity, which is engaged in, or conducts a business substantially the same as, the Aflac Business or any part thereof.

(3)“Restricted Territory” means the area within the United States (including the District of Columbia, Puerto Rico, the U.S. Virgin Islands and Guam) and Japan.

B.    Covenant against disclosure of confidential information and trade secrets. Employee acknowledges that, during the term of his employment under this Agreement, Employee will be privy to (i) certain confidential and proprietary information of Aflac Companies, which constitutes trade secrets as defined in the Georgia Trade Secret Act of 1990 (the “Trade Secret Act”), and (ii) certain other confidential and proprietary information of Aflac Companies that may not constitute trade secrets as so defined. With respect to such Trade Secrets and other confidential and proprietary information, Employee covenants and agrees, as follows:

(1)    Employee agrees to not disclose to any third party, without the prior written consent of the Corporation Chief Executive Officer or unless necessary to perform his duties and responsibilities hereunder, the processes, machines, technical documentation, computer programs, customer lists, identity of customers, business plans, marketing plans and techniques, pricing data, financial data, marketing programs, customer files, financial institution files, technical expertise and know how, and other confidential and proprietary information and trade secrets, whether as defined in the Trade Secret Act or which may lie beyond it (collectively, the “Property”), which have been or will be provided to Employee by any of the Aflac Companies and are confidential and proprietary property of any of the Aflac Companies. Employee further agrees not to use any Property to his personal benefit or the benefit of any third party. Employee also agrees to return to Japan Operation all such Property which is tangible upon or before his Actual Termination Date. Notwithstanding the foregoing, the Property protected hereunder will not include any data or information that has been disclosed to the public (except where such public disclosure has been made by Employee without authorization), that has been independently developed and disclosed by others, or that otherwise enters the public domain through lawful means. The restrictions in this Paragraph are in addition to, and not in lieu of, any rights or remedies Corporation or any of its subsidiaries may have available pursuant to the laws of the State of Georgia to prevent the disclosure of trade secrets and proprietary information, with such laws including but not limited to the Trade Secrets Act.

(2)    Employee’s obligations under the nondisclosure provisions in this Paragraph 15.B (i) will apply to Property that does not constitute trade secrets during the term of Employee’s employment hereunder and for as long as the Property remains confidential, and (ii) will apply to Property that constitutes trade secrets until such Property no longer constitutes trade secrets and is no longer confidential.

16.    Enforcement of restrictive covenants.

A.Blue Penciling. The parties agree that if any court finds that any provision in Paragraph 15 or this Paragraph 16 is overly broad such that it is unenforceable under applicable state law, the court may reform that provision to narrow its scope to the extent necessary to render it enforceable.

B.Severability. Employee acknowledges and agrees that the covenant against competition and the covenant against disclosure contained in Paragraphs 15.A and 15.B, respectively, are reasonable and valid and do not impose limitations greater than those that are necessary to protect the business interests and confidential information of the Aflac Companies.

The parties agree that the invalidity or unenforceability of any one or more of such covenants, other provisions, or parts thereof (collectively the “Covenants”) will not affect the validity or enforceability of the other Covenants, all of which are inserted conditionally on there being valid in law. In the event one or more Covenants contained herein are ruled invalid (after application of subparagraph A of this Paragraph), this Agreement will be construed as if such invalid Covenant had not been inserted. The parties hereto agree that the Covenants contained in this Agreement are severable and divisible; that none of such Covenants depends on any other Covenant for its enforceability; that such Covenants constitute enforceable obligations between the parties; that each such Covenant will be construed as an agreement independent of any other Covenant of this Agreement; and that the existence of any claim or cause of action by one party to this Agreement against the other party to this Agreement, whether predicated on this Agreement or otherwise, will not constitute a defense to the enforcement by any party to this Agreement of any such Covenant.

C.Injunctive Relief. Employee hereby agrees that any remedy at law for any breach of the Covenants will be inadequate and that any of the Aflac Companies will be entitled to apply for injunctive relief in addition to any other remedy the Aflac Companies might have under this Agreement.

D.Claim for Damages. Employee acknowledges that, in addition to seeking injunctive relief, any of the Aflac Companies may bring a cause of action against him for any and all losses, liabilities, damages, deficiencies, costs (including, without limitation, court costs), and expenses (including, without limitation, reasonable attorneys’ fees), incurred by the Aflac Companies and arising out of or due to my breach of any Covenant or agreement contained in Paragraph 15. Notwithstanding anything herein to the contrary, the breach of any Covenant will cause Employee to forfeit any and all payments otherwise due under subparagraphs A(1), B(1) and B(3) (as applicable) of Paragraph 13, and the breach of the nondisclosure Covenant set forth in Paragraph 15.B will cause Employee to forfeit any and all payments otherwise due under subparagraphs A(2) and B(2) (as applicable) of Paragraph 13; and Employee agrees to repay to the Aflac Companies any amount already paid under such applicable subparagraph.

E.Survival. Paragraph 15 and this Paragraph 16, to the extent applicable, will survive the termination of this Agreement and Employee’s employment. In addition, neither the termination of this Agreement nor Employee’ employment will terminate any other obligations or rights that, by the specific terms of this Agreement, extend beyond such termination.

17.    Right to acquire insurance. If Employee shall terminate his employment hereunder for any reason other than death, he may, at his election, acquire any insurance policies upon his life owned by the Japan Operation by giving written notice of his election to Japan Operation within ninety (90) days after his termination of employment. Such policies shall be transferred to the Employee upon his payment to Japan Operation of the then interpolated terminal reserve value of said insurance. In the event any policies transferred to Employee as herein provided shall not have an interpolated terminal reserve value, then the amount to be paid by Employee shall be its then fair market value.

18.    Change in control.

A.    In general. In the event there is a Change in Control (as defined in this Paragraph), this Agreement shall, in order to help eliminate the uncertainties and concerns which may arise at such time, be automatically extended upon all of the same terms and provisions contained herein, for an additional period of three (3) years, beginning on the first day of the month during which such Change in Control shall occur.

B.    Notwithstanding the term of subparagraph A(2) and (B)(2) of Paragraph 13, and in lieu of the obligations of Japan Operation under such paragraph, if, after a Change in Control Employee’s employment is terminated by the Japan Operation without “good cause” (as defined in Paragraph 13), or is terminated by Employee for “good reason” (as defined in Paragraph 18), any such termination by Japan Operation to be made only in accordance with the requirements specified by Paragraph 13.A, Employee shall be entitled to the following if Employee timely signs and does not revoke a release as provided in subparagraph G of Paragraph 13:

(1)    In a manner, at such times and in such forms as provided in Paragraph13.A(1)) Japan Operation shall pay Employee’s full base salary to Employee through the date of termination stated in Japan Operation’s written notice required pursuant to Paragraph 13.A hereof (hereinafter in this Paragraph the “Termination Date”) at the rate in effect on the date such notice is given and, additionally, shall pay Employee all compensation and benefits payable to Employee under the terms of any compensation or benefit plan, program or arrangement maintained by Japan Operation during such period through the Termination Date.

(2)    Japan Operation shall pay Employee all compensation and benefits due Employee under Japan Operation’s retirement, insurance and other compensation or benefit plans, programs of arrangements as such payments become due. The amount of such compensation and benefits shall be determined under, and paid in accordance with, Japan Operation’s retirement, insurance and other compensation or benefit plans, programs and arrangements.

(3)    In lieu of any further salary payments to Employee for periods subsequent to the Termination Date, Japan Operation shall pay to Employee, immediately after the Termination Date, a lump sum payment, in cash, equal to three (3) times the sum of (i) Employee’s annual base salary in effect immediately prior to the Change in Control and (ii) the higher of the amount paid to Employee pursuant to the Aflac Incorporated Management Incentive Plan (or any successor plan thereto) for the year preceding the year in which the Termination Date occurs or paid in the year preceding the year in which the Change in Control occurs; provided, if Employee’s separation from service occurs more than twenty-four (24) months after the Change in Control, only the portion of such lump-sum severance payment in excess of the total amount that would have been payable under Paragraphs 13.A(2)(a) and (b) shall be paid pursuant to the terms hereinabove, and the remainder shall be paid pursuant to the terms of Paragraphs 13.A(2)(a) and (b) as if no Change in Control had occurred; and, provided further, to the extent any amount of such lump-sum amount payable after the Termination Date is not exempt from section 409A, such amount will be paid upon the day after the six (6)-month anniversary of Employee’s separation from service.

(4)    Japan Operation shall pay to Employee, immediately after the Termination Date, a lump sum amount, in cash, equal to a prorata portion (based on the number of days Employee is an employee during the year in which the Termination Date occurs) of the aggregate value of the maximum annual amount of all contingent incentive compensation awards to Employee for all uncompleted periods under the Aflac Incorporated Management Incentive Plan (or successor plan thereto); provided, to the extent any amount of such lump sum payable after the Termination Date is not exempt from Section 409A, such amount will be paid upon the day after the six (6)-month anniversary of Employee’s separation from service.

(5)    For a thirty-six (36)-month period after Employee’s separation from service, Japan Operation shall provide Employee with life, disability, accident and health insurance benefits substantially similar to and equal or greater in economic value than such benefits which Employee is receiving immediately prior to the Termination Date (without giving effect to any reduction in such benefits subsequent to a Change in Control which reduction in benefits would constitute “good reason” as defined in this Paragraph). Benefits required to be provided to Employee pursuant to this subparagraph B(5) shall be reduced to the extent comparable benefits are actually received by or made available to Employee without cost during such thirty-six (36)-month period and any such benefit actually received by Employee shall be reported to Japan Operation by Employee.

Notwithstanding the foregoing, with respect to any of such life and/or disability benefits that are fully insured, in lieu of providing such benefits for such period, Japan Operation shall pay Employee a lump-sum amount equal to the cost of such benefits on a post-employment basis for such thirty-six (36)-month period; provided, any such cash payment shall be made as soon as practicable after Employee’s separation from service, with any amount that is not exempt from Section 409A and that is otherwise payable within the six (6)-month period beginning on the date of his separation from service being paid upon the day after the six (6)-month anniversary of his separation from service.

C.    In addition to the payments provided for in subparagraph B of this Paragraph 18, in the event that after a Change in Control Employee’s employment by the Japan Operation is terminated by the Japan Operation without “good cause” or by Employee for “good reason,” Japan Operation shall continue to honor all Equity Awards granted to Employee (subject to the terms of such awards) prior to the Termination Date, and all Equity Awards granted to Employee prior to his Actual Termination Date shall become fully vested and exercisable (and to the extent applicable, e.g., with respect to any restricted stock units or similar awards) payable, as of the Termination Date; provided, any Equity Awards that vest based on performance will vest as if the maximum performance under the performance criteria had been satisfied.

D.    Notwithstanding any other provisions of this Agreement, in the event that any payment or benefit received or to be received by Employee in connection with a Change in Control or the termination of Employee’s employment (whether pursuant to the terms of this Agreement or any other plan, arrangement or agreement with Corporation or Japan Operation, any person whose actions result in a Change in Control or any person affiliated with the Japan Operation or such person) (all such payments and benefits being hereinafter called “Total Payments”) would not be deductible (in whole or in part) by the Japan Operation, an affiliate or

person making such payment or providing such benefit as a result of Section 280G of the Internal Revenue Code of 1986 (the “Code”) then, to the extent necessary to make such portion of the Total Payments deductible (and after taking into account any reduction in the Total Payments provided by reason of Section 280G of the Code in such other plan, arrangement or agreement), adjustments in such payments shall be made as follows: (i) the cash payments provided pursuant to subparagraph B.(3) and B.(4) of this Paragraph 18 that are exempt from Section 409A shall first be reduced (if necessary, to zero); (ii) then, if further reductions are necessary, benefits provided under subparagraph B.(5) of this Paragraph 18 that are exempt from Section 409A shall be reduced (if necessary, to zero); (iii) then, if still further reductions are necessary, the cash payments provided pursuant to subparagraph B.(3) and B.(4) of this Paragraph 18 that are not exempt from Section 409A shall be reduced (if necessary, to zero); and (iv) finally, if still further reductions are necessary, all of the benefits provided under subparagraph B.(5) of this Paragraph 18 that are not exempt from Section 409A shall be forfeited. For purposes of this limitation (i) no portion of the Total Payments, the receipt or enjoyment of which Employee shall have effectively waived in writing prior to the date of termination of employment shall be taken into account (provided that, in no event will any such waiver impermissibly affect any portion of the Total Payments that is subject to Section 409A), (ii) no portion of the Total Payments shall be taken into account which in the opinion of the tax counsel selected by the Corporation’s independent auditors and reasonably acceptable to Employee does not constitute a “parachute payment” within the meaning of Section 280G(b)(2) of the Code, including by reason of Section 280G(b)(4)(A) of the Code, (iii) except as provided in clause (iv) above, the payments and benefits shall be reduced only to the extent necessary so that the Total Payments (other than those referred to in clauses (i) or (ii)) in their entirety constitute reasonable compensation for services actually rendered within the meaning of Section 280G(b)(4)(B) of the Code or are otherwise not subject to disallowance as deductions, in the opinion of the tax counsel referred to in clause (ii); and (iv) the value of any non-cash benefit or any deferred payment or benefit included in the Total Payments shall be determined by the Corporation’s independent auditors in accordance with the principles of Sections 280G(d)(3) and (4) of the Code. In no event shall Japan Operation’s obligation to continue to honor all Equity Awards granted to Employee prior to the Termination Date nor the vesting of Equity Awards in accordance with Paragraph 18.C hereof be affected by this Paragraph 18.D.

E.    Definitions.

(1)    “Change in Control” means a change in ownership or effective control of the Japan Operation, Corporation or any other “relevant corporation” within the meaning of Treas. Reg. §1.409A-3(i)(5)(ii) (each a “Relevant Corporation”) or a change in the ownership of a substantial portion of the assets of a Relevant Corporation, all within the meaning of Section 409A. As a general overview, Section 409A’s definition of these terms, and the dates as of which they occur, are as follows:

(a)    The date any one person, or more than one person acting as a group, acquires ownership of stock of a Relevant Corporation that, together with stock held by such person or group constitutes more than fifty percent (50%) of the total voting power of the stock of a Relevant Corporation. However, if any one person, or more than one person acting as a group, is considered to own more

than fifty percent (50%) of the total fair market value or total voting power of the stock of a Relevant Corporation, the acquisition of additional stock by the same person or persons is not considered to cause a change in the ownership of a Relevant Corporation or to cause a change in the effective control of a Relevant Corporation.

(b)    The date any one person, or more than one person acting as a group, acquires (or has acquired during the twelve (12)-month period ending on the date of the most recent acquisition by such person or persons) ownership of stock of a Relevant Corporation possessing thirty percent (30%) or more of the total voting power of the stock of a Relevant Corporation.

(c)    The date that any one person, or more than one person acting as a group acquires (or has acquired during the twelve (12)-month period ending on the date of the most recent acquisition by such person or persons) assets from a Relevant Corporation that have a total gross fair market value equal to or more than forty percent (40%) of the total gross fair market value of all of the assets of a Relevant Corporation immediately before such acquisition or acquisitions.

(d)    The date a majority of the board of directors of a Relevant Corporation for which no other corporation is a majority shareholder is replaced during any twelve (12)-month period by directors whose appointment or election is not endorsed by a majority of the members of such Relevant Corporation’s board of directors before the date of the appointment or election.

(2)    “Good reason” shall mean the termination of employment by Employee upon the occurrence of any one or more of the following events to the extent that there is, or would be if not corrected, a material negative change in Employee’s employment relationship with Japan Operation:

(a)    A material breach by Japan Operation of the terms and conditions of this Agreement affecting Employee’s salary and bonus compensation, any employee benefit, Equity Awards or the loss of any of Employee’s titles or positions with Japan Operation;

(b)    A significant diminution of Employee’s duties and responsibilities;

(c)    The assignment to Employee of duties significantly inconsistent with or different from his duties and responsibilities existing at the time of a Change in Control;

(d)    A purported termination of Employee’s employment by Japan Operation other than as permitted by this Agreement;

(e)    The relocation of Japan Operation’s principal office or of Employee’s own office to any place beyond twenty-five (25) miles from the current principal office of Japan Operation; and

(f)    The failure of any successor to Japan Operation to expressly assume and agree to discharge Japan Operation’s obligations to Employee under this Agreement as extended under this Paragraph, in form and substance satisfactory to Employee.

Notwithstanding the foregoing, Employee shall have good reason under this Agreement only if (i) Employee provides Japan Operation and Corporation, within ninety (90) days of the occurrence of the event giving rise to the notice, a written notice indicating the specific good reason provision(s) in this Agreement relied upon, setting forth in reasonable detail the facts and circumstances claimed to provide a basis for good reason, and indicating a date of termination of employment (not less than thirty (30) nor more than sixty (60) days after the date such notice is given); and (ii) such facts and circumstances are not substantially corrected by Japan Operation prior to the date of termination specified by Employee in such notice. Any failure by Employee to set forth in a notice of good reason any facts or circumstances which contribute to the showing of good reason shall not waive any right of Employee hereunder or preclude Employee from asserting such fact or circumstances in enforcing his rights hereunder.

19.    No requirement to see employment and no offset. Corporation agrees that, if Employee’s employment is terminated by Japan Operation during the term of this Agreement or by Employee for “good reason” during the term of this Agreement, Employee is not required to seek other employment or attempt in any way to reduce the amounts payable to Employee by Japan Operation pursuant to the applicable terms of this Agreement; it being understood and agreed that the amount of any payment or benefit to Employee provided for hereunder shall not be reduced by any compensation or other benefits earned by Employee as a result of his employment by another employer or, after a Change in Control, by Japan Operation’s attempt to offset any amount claimed to be owed by Employee to Japan Operation or otherwise.

20.    Waiver of breach or violation not deemed continuing. The waiver by either party of a breach or violation of any provision of this Agreement shall not operate as or be construed to be a waiver of any subsequent breach hereof.

21.    Notices. Any and all notices required or permitted to be given under this Agreement will be sufficient if furnished in writing, sent by registered or certified mail to his last known residence in the case of Employee or to Japan Operation’s principal office in Japan with a copy to Corporation’s principal office in Columbus, Georgia, Attention Senior Human Resources Officer, in the case of the Japan Operation.

22.    Authority. The provisions of this Agreement required to be approved by the Board of Directors of Corporation or the Compensation Committee of the Board have been so approved and authorized.

23.    Arbitration. From time-to-time, Employee agrees to sign and become a party to any arbitration agreement with such terms as Corporation may provide, and the terms of such arbitration agreement shall be incorporated herein by this reference and shall apply to all claims under this Agreement; provided, notwithstanding the foregoing, any claims or actions, whether for damages, injunctive relief or other relief, for any violation or breach of the Covenants set forth in Paragraphs 15 and 16, including but not limited to the actions described in subparagraphs C and D of Paragraph 16, (i) shall excluded from the arbitration agreement and its applicability, and (ii) shall be subject to the jurisdiction of the applicable court as set forth in Paragraph 24.

/s/ DPA	/s/ CL
Initials for Corporation	Initials of Employee

24.    Governing Law. This Agreement shall be interpreted, construed and governed according to the laws of the State of Georgia. Any legal action brought in regard to this Agreement, which is not subject to arbitration as provided in Paragraph 23 or is brought to enforce the finding of the arbitrator, shall be brought in the Superior Court of Muscogee County, Georgia, or the United States District Court of the Southern District of Georgia, whichever applies, and the parties waive jurisdiction and venue in any other court.

25.    Paragraph Headings. The paragraph headings contained in this Agreement are for convenience only and shall in no manner be construed as part of this Agreement.

26.    Two originals. This Agreement is executed in two (2) originals, each of which shall be deemed an original and together shall constitute one and the same Agreement, with one original being delivered to each party hereto.

27.    Code Section 409A. This Agreement is intended to comply with the requirements of Code Section 409A and shall be construed accordingly. Any payments or distributions to be made to Employee under this Agreement upon a “separation from service” (as defined above) of amounts classified as “nonqualified deferred compensation” for purposes of Code Section 409A, payable due to a separation from service and not exempt from Section 409A, shall in no event be made or commence until six (6) months after such separation from service. Each payment of nonqualified deferred compensation under this Agreement shall be treated as a separate payment for purposes of Code Section 409A. Notwithstanding the foregoing, neither Aflac nor Japan Operation shall be liable to Employee or any other person if the Internal Revenue Service or any court determines for any reason that any payments under this Agreement are subject to taxes or penalties under Section 409A.

28.    Tax Withholding. Japan Operation shall withhold all applicable taxes from any amounts payable under this Agreement, including, but not limited to, any federal, foreign, state and local taxes; and all such amounts described in this Agreement shall be paid net of such taxes.

29.    Amendments and Waivers. Except as otherwise specified herein, this Agreement may be amended, and the observance of any term of this Agreement may be waived (either

generally or in a particular instance and either retroactively or prospectively), only with the written consent of Corporation and Employee.

30.    Assignment. This Agreement is personal to Employee and without the prior written consent of Corporation shall not be assignable by Employee, and any assignment in violation of this Agreement shall be void. Employee hereby consents to Corporation assigning this Agreement and its rights and obligations hereunder to any other subsidiary or an affiliate of Corporation and Japan Operation, provided that any such assignee agrees to assume and perform all obligations of Corporation and Japan Operation hereunder.

IN WITNESS WHEREOF, Corporation has hereunto caused its name to be signed and its seal to be affixed by its duly authorized officers, and Employee has hereunto set his hand and seal, all being done in duplicate originals, with one original being delivered to each party as of the 28^th day of November, 2017.

	AFLAC INCORPORATED
/s/ Charles D. Lake	BY:	/s/ Daniel P. Amos
CHARLES D. LAKE		DANIEL P. AMOS
Employee		Chairman and Chief Executive Officer
/s/ Andy Conrad	ATTEST:	/s/ J. Matthew Loudermilk
Witness		J. MATTHEW LOUDERMILK
		VP, Corporate Secretary

EX-10.6

Aflac Incorporated 1st Quarter 2018 10-Q

Exhibit 10.6

STATE OF GEORGIA

COUNTY OF MUSCOGEE:

EMPLOYMENT AGREEMENT

THIS AGREEMENT, made and entered into as of the 11th day of June, 2015, by and between Aflac Incorporated, a Georgia corporation, hereinafter referred to as "Corporation," and AUDREY BOONE TILLMAN, a resident of said State and County, hereinafter referred to as "Employee";

W I T N E S S E T H T H A T:

WHEREAS, Corporation and Employee desire to enter into an Employment Agreement and to set forth the terms and conditions of Employee's employment by Corporation as its Executive Vice President, General Counsel;

NOW, THEREFORE, the parties, for and in consideration of the mutual covenants and agreements hereinafter contained, do contract and agree as follows, to-wit:

1.Purpose and employment. The purpose of this Agreement is to define the relationship between Corporation as an employer and Employee as an employee and Executive Vice President, General Counsel of Corporation.

2.Duties. Employee agrees to provide executive management services as Executive Vice President, General Counsel of Corporation to Corporation and its subsidiaries and affiliates on a full-time and exclusive basis; provided, however, nothing shall preclude Employee from engaging in charitable and community affairs or managing her own or her family's personal investments.

3.Performance. Employee agrees to devote all necessary time and her best efforts in the performance of her duties as Executive Vice President, General Counsel of Corporation on behalf of Corporation and its subsidiaries and affiliates.

4.Term. The term of employment under this Agreement shall begin June 11, 2015, and shall continue for a period of three (3) years until June 10, 2018, unless extended or sooner terminated as hereinafter provided. On an annual basis beginning effective June 11, 2016, the scheduled term of this Agreement shall be extended for successive one (1)-year periods unless written notice of termination is given prior to such annual date by one party to the other party that the Agreement will not be extended by its terms.

5.Base salary. For all the services rendered by Employee, Corporation shall continue to pay Employee a base salary of five hundred thousand dollars ($500,000.00) per year commencing January 1, 2015, said salary to be payable in accordance with Corporation's normal payroll procedures. Employee's base salary may be increased annually during the term of this Agreement and any extensions hereof as determined by the Compensation Committee of the Board of Directors (the “Compensation Committee of the Board”).

6.Documentation of increase in base salary. Any increase in base salary determined by the Compensation Committee of the Board under Paragraph 5 shall be documented in the Corporation’s records and communicated to Employee, as the Compensation Committee of the Board may determine.

7.Management Incentive Plan. In addition to the base salary paid to Employee in accordance with Paragraph 5, Corporation shall for each calendar year of Employee's employment by Corporation, beginning with the calendar year 2015, continue to pay Employee, as performance bonus compensation, an amount determined each year under Corporation's current Management Incentive Plan (i.e., short-term incentive program) with a target level based on at least eighty percent (80%) of base salary. Nothing in this Paragraph shall preclude Employee from receiving additional discretionary bonuses approved by the Chief Executive Officer or the Compensation Committee of the Board. Amounts payable to Employee under the Management Incentive Plan (or any successor or other executive bonus program) shall be payable in such manner, at such times and in such forms, as prescribed by the terms of the Management Incentive Plan (or successor or other program).

8.Employee benefits. Employee shall be eligible to participate with other employees of Corporation in all fringe benefit programs applicable to similarly-situated employees generally which may be authorized and adopted from time to time by the Board, including without limitation: a qualified pension plan, a qualified 401(k) and profit sharing plan, a disability income or sick pay plan, an accident and health plan (including medical reimbursement and hospitalization and major medical benefits), and a group life insurance plan. In addition, Corporation shall furnish to Employee such other "fringe" or employee benefits as are provided to similarly-situated key executive employees of Corporation and such additional employee benefits which the Compensation Committee of the Board or the Corporation’s Chief Executive Officer shall determine to be appropriate to Employee's duties and responsibilities as Executive Vice President, General Counsel of Corporation, including, without limitation, reimbursement of legal and accounting expenses incurred by Employee in connection with the preparation of her employment or other agreements with Corporation and any expenses for legal, accounting or financial services incurred by Employee in connection with her employment. Any reimbursements made pursuant to the preceding sentence shall be paid as soon as practicable but no later than ninety (90) days after Employee submits evidence of such expenses to Corporation (which payment date shall in no event be later than the last day of the calendar year following the calendar year in which the expense was incurred). The amount of such reimbursements during any calendar year shall not affect the benefits provided in any other calendar year, and the right to any such benefits shall not be subject to liquidation or exchange for another benefit.

9.Equity award plans. Employee shall be eligible to be awarded stock options, restricted stock awards, and other equity awards (collectively, “Equity Awards”) to purchase Corporation's common stock under Corporation's Long-Term Incentive Plans for selected key employees and directors during the term of this Agreement.

10.Working facilities and expenses. Employee shall be provided with an office, books, periodicals, stenographic and technical help, ground and air transportation, and such other facilities,

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equipment, supplies and services suitable to her position and adequate for the performance of her duties. Corporation shall pay Employee's fees and dues in such social and country clubs, civic clubs and business societies and associations as shall be appropriate in facilitating Employee's job performance and in the best interest of Corporation. Corporation shall also pay all appropriate business liability insurance and any business licenses and fees pertaining to the services rendered by Employee hereunder.

Employee is encouraged and is expected, from time to time, to incur reasonable expenses for promoting the business of Corporation, including expenses for social and civic club memberships and participation, entertainment, travel and other activities associated with Employee's duties. The cost of all such activities shall be the expenses of Corporation unless the Compensation Committee of the Board shall determine in advance that any such expense of Employee should be paid by Employee.

Any expense reimbursements made to satisfy the terms of this Paragraph 10 shall be paid as soon as practicable but no later than ninety (90) days after Employee submits evidence of such expenses to Corporation (which payment date shall in no event be later than the last day of the calendar year following the calendar year in which the expense was incurred). The amount of such reimbursements during any calendar year shall not affect the benefits provided in any other calendar year, and the right to any benefits under this Paragraph shall not be subject to liquidation or exchange for another benefit.

11.Vacation. Employee shall continue to be entitled to her vacation time with pay during each calendar year in accordance with Corporation's vacation policy for senior executive employees. In addition, Employee shall be entitled to such holidays as Corporation shall recognize for its employees generally.

12.Sickness and total disability. Employee's absence from work because of sickness or accident (not resulting in Employee becoming "totally disabled," as that term is hereinafter defined) shall not result in any adjustment in Employee's compensation or other benefits under this Agreement.

Should Employee become totally disabled as a result of sickness or accident and unable to adequately perform her regular duties prescribed under this Agreement, her base salary (which shall continue to be adjusted as provided for in Paragraph 5), together with incentive bonuses under Corporation's Management Incentive Plan and her participation in Corporation's employee benefit programs and retirement plan shall continue without reduction except as hereinafter provided, during the continuance of such disability for a period not exceeding the earlier of (1) the end of the term of this Agreement or any extension hereof, or (2) a period of one and one-half (1-1/2) years (547 calendar days) for each continuous disability. Payments pursuant to this Paragraph 12 shall be reduced by any amounts paid to Employee during any such period of disability from time to time under any disability programs, plans or policies maintained by Corporation, its subsidiaries or affiliates. In addition, if during, or on the first day of, the period Employee is receiving such disability pay and benefits, (i) Employee reaches or has reached the date upon which she satisfies the criteria to receive the maximum percentage of retirement benefits available under the Aflac Incorporated Supplemental Executive Retirement Plan (the “Maximum Retirement Benefit Date”);

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and (ii) upon or after the Maximum Retirement Benefit Date, there ceases to be a reasonable expectation that she will return to perform services for Corporation, such that Employee has a separation from service (as defined below) and her Benefit Commencement Date under the Aflac Incorporated Supplemental Executive Retirement Plan (the “SERP”) has occurred (whether or not the SERP benefit payments are to actually commence on her Benefit Commencement Date or are to be delayed by six (6) months as may be required under the SERP to satisfy the requirements of Section 409A of the Internal Revenue Code of 1986, as amended (“Section 409A”)); the amount of disability pay consisting of base salary and cash incentive bonuses being paid or payable under this Paragraph 12 shall be reduced effective as of the date of such separation from service to an amount that is forty percent (40%) of the amount being paid or payable immediately before such date.

Should Employee's total disability continue for a period beyond the end of the term of this Agreement or in excess of five hundred and forty-seven (547) calendar days, this Agreement shall, at the end of such period which first occurs, be automatically terminated. If, however, prior to such time, Employee's total disability shall have ceased and she shall have resumed the adequate performance of her duties hereunder, this Agreement shall continue in full force and effect and Employee shall be entitled to continue her employment hereunder and to receive her full compensation and other benefits as though she had not been disabled; provided, however, unless Employee shall adequately perform her duties hereunder for a continuous period of at least sixty (60) calendar days following a period of total disability before Employee again becomes totally disabled, she shall not be entitled to start a new five hundred and forty-seven (547)-day period under this Paragraph, but instead may only continue under the remaining portion of the original five hundred and forty-seven (547)-day period of total disability. In the event Employee shall not adequately perform her duties hereunder for a continuous period of at least sixty (60) calendar days following a period of total disability, the running of the original five hundred and forty-seven (547)-day period shall cease during the time of Employee's adequate performance of her duties hereunder before Employee again becomes totally disabled.

If, following Employee’s becoming totally disabled, this Agreement shall be terminated (as provided in the preceding paragraph) and Employee’s employment with Corporation terminated, Employee shall be one hundred percent (100%) vested in, and entitled to, benefits under the SERP determined as if Employee’s “Years of Participation” and “Years of Employment” (as such terms (or similar terms) are defined in the SERP) include the period of time before such termination date during which Employee was totally disabled. Furthermore, if on such termination date Employee is not yet eligible for an early retirement benefit under the SERP, Employee will be entitled to benefits under the SERP the amount of which shall be determined as if her termination date was Employee’s Early Retirement Date (as such term is defined in the SERP); provided, these provisions shall not affect the timing or form of her SERP distributions, which shall be determined solely under the terms of the SERP.

For the purpose of this Agreement, the term "totally disabled" or "total disability" shall mean Employee's inability to adequately perform her executive and management duties hereunder on account of accident or illness. It is understood that Employee's occasional sickness or other incapacity of short duration may not result in her being or becoming "totally disabled"; however, such illness or incapacity could constitute Employee's being or becoming "totally disabled" if such illness or incapacity is prolonged or recurring.

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13.Termination of employment.

A.Termination by Corporation. The Corporation's Chief Executive Officer may terminate this Agreement and Employee’s employment (the date thereof being referred to as her “Actual Termination Date”), at any time, with or without "good cause" ("good cause" being hereinafter defined), (i) immediately upon giving written notice to Employee of her termination for “good cause,” and (ii) by giving at least thirty (30) days' written notice to Employee of Corporation’s intention to terminate Employee's employment without "good cause"; provided, however, with respect to termination without “good cause,” Corporation may, at its selection, terminate Employee's actual employment (so that Employee no longer renders services on behalf of Corporation) at any time during said thirty (30) day period; and,

(1)In the event such termination is for "good cause," Corporation shall be obligated only to pay Employee her base salary earned under Paragraph 5 through her Actual Termination Date.

For purposes of this Agreement (including Paragraph 18 hereof), "good cause" shall mean: that, in the sole discretion of the Corporation’s Chief Executive Officer, any of the following have occurred or exist: (i) the willful and deliberate failure of Employee to substantially perform her executive and management duties hereunder for reasons other than Employee's sickness, injury or disability; (ii) the willful and deliberate conduct by Employee, which results in substantial injury or damage to Corporation; or (iii) the conviction or plea of guilty by Employee of a felony crime. A termination of Employee for “good cause” based on clause (i) or (ii) of the preceding sentence will take effect immediately, unless Corporation’s Chief Executive Officer, in his sole discretion, allows Employee a right to cure, in which case such termination for “good cause” will take effect thirty (30) days (or such shorter period as determined by the Chief Executive Officer) after Employee receives from Corporation written notice of its intent to terminate Employee’s employment and Corporation’s description of the alleged cause, unless Employee, in the opinion of the Corporation’s Chief Executive Officer, during such permitted cure period, makes significant progress toward remedying (and as soon as practicable thereafter, substantially completes the remedy of) the events or circumstances constituting “good cause”; a termination of Employee for “good cause” based on clause (iii) of the preceding sentence will take effect immediately.

(2)In the event such termination is without "good cause," as defined in subparagraph (1) of this Paragraph and, if applicable, subject to the terms of Paragraph 18, and if Employee timely signs and does not revoke a release as provided in subparagraph G of Paragraph 13, Corporation shall be obligated to:

(a)upon Employee’s separation from service, pay Employee her base salary as provided for in Paragraph 5 of this Agreement up to the end of the scheduled term of this Agreement; provided, if at the time Employee has a separation from service (such that her Benefit Commencement Date under the SERP has occurred) Employee has attained her Maximum Retirement Benefit Date, all payments being paid or payable under this subparagraph (a) shall cease or not commence, as applicable. Such amount, if any, payable under this

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subparagraph (a) for the period after her Actual Termination Date will be paid in accordance with the regular payroll schedule applicable to all other similarly-situated active executive employees of Corporation commencing with the next regularly scheduled payday, with any portion of such amount that is payable within the six (6)-month period beginning on the date of her separation from service being paid in a lump sum upon the day after the six (6)-month anniversary of her separation from service;

(b)pay Employee an amount equal to a portion of her performance bonus compensation as provided for in Paragraph 7 of this Agreement prorated based on the number of days through the end of the scheduled term of this Agreement; provided, if at the time Employee has a separation from service (such that her Benefit Commencement Date under the SERP has occurred) Employee has attained her Maximum Retirement Benefit Date, all payments being paid or payable under this subparagraph (b) shall cease or not commence, as applicable. The amount of such bonus payable under this subparagraph (b), if any, will be paid to Employee pursuant to the terms and customary operations of the Management Incentive Program (or other applicable bonus program) except that Employee’s performance will be deemed to be at target while actual performance of Corporation will be applied; provided, if the scheduled term of this Agreement ends after the calendar year in which the notice of termination is given, (i) the bonus payment for the calendar year in which such notice is given (and any other full calendar year that ends before the scheduled term of this Agreement ends) will be paid without any proration; and (ii) the amount of the bonus payment for the calendar year in which the scheduled term of this Agreement ends will be calculated on a pro rata basis, using the number of days elapsed during such calendar year through the end of the scheduled term of this Agreement, and will be paid upon Employee’s separation from service in a lump sum between January 1 and March 15, inclusive, of the calendar year following the calendar year in which the scheduled term of this Agreement ends or, if later, upon the day after the six (6)-month anniversary of her separation from service;

(c)continue to honor all Equity Awards, subject to the terms thereof, granted to Employee prior to the termination date stated in said written notice, all of said options to be or become fully vested as of the termination date stated in said written notice; provided, any Equity Awards that vest based on performance will remain subject to the applicable performance criteria, and Employee’s performance will be deemed to be at target while actual vesting based on performance of Corporation will be applied in the manner and at the time provided in the agreements for such Equity Awards;

(d)upon Employee’s separation from service, continue to pay or provide to Employee all of the retirement, health, life and disability benefits, as are provided for in this Agreement or under any programs, plans or policies covering Employee at the time of any such notice of termination, up to the end of the scheduled term of this Agreement.

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Notwithstanding the foregoing, after Employee’s Actual Termination Date, Employee shall not actively participate in any retirement plan qualified under Code Section 401(a), any employee stock purchase plan under Code Section 423, any fully insured benefit for which the insurer does not allow post-employment participation, or any other plan or benefit (other than Corporation’s self-insured group health plan) that Corporation or the third-party insurer of such benefit reasonably determines is not suitable or available for post-employment participation. In such event, Employee shall be entitled to the benefits described in the next succeeding paragraph, to the extent applicable, up to the end of the scheduled term of this Agreement.

(i)After Employee’s Actual Termination Date, Employee shall no longer actively participate in the Aflac Incorporated 401(k) Savings and Profit Sharing Plan (the “401(k) Plan”). Corporation shall pay to Employee an amount equal to the dollar amount of matching contributions, if any, that would have been made to Employee’s account(s) under the 401(k) Plan if Employee had continued to actively participate in such plan for the period from Employee’s Actual Termination Date through the end of the scheduled term of this Agreement, and had made Employee deferrals at the deferral rate necessary to receive the maximum matching contribution (if any) available to her under the terms of the 401(k) Plan with such amount being calculated as if Employee’s compensation and the limits applicable under the 401(k) plan all remained at the levels in effect as of the date the notice of termination is given. This payment shall be made to Employee in a lump sum upon the day after the six (6)-month anniversary of her separation from service.

(ii)If, following Employee’s separation from service, Employee does not qualify for retiree health benefits (if any) under Corporation’s group health plan, then upon Employee’s separation from service, Corporation shall allow Employee to continue to participate in Corporation’s group health plan for the remainder of the stated term of this Agreement as if she remained an active employee; provided, Employee pays the full premium cost for such coverage; and provided further, Corporation shall reimburse Employee for the employer portion of the cost of such coverage (such that Employee shall pay in net terms only the active employee cost of such coverage) within sixty (60) days after the end of each calendar month in which Employee maintains such coverage.

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B.Termination by Employee. Employee may terminate this Agreement at any time by giving at least sixty (60) days' written notice to Corporation of her intention to terminate her employment;

(1)in the event such termination by Employee shall be without "good reason" (as defined in Paragraph 18 hereof) and with a bona fide intent either (i) to retire or (ii) not to work in, or engage in a business or activity that would be in a Competing Business (as defined in Paragraph 15) that would violate the covenant against competition as set forth in Paragraph 15, Corporation shall be obligated to:

(a)pay Employee her base salary due her under Paragraph 5 of this Agreement up to her Actual Termination Date;

(b)pay Employee an amount equal to any performance bonus compensation due her under Paragraph 7 of this Agreement for the period ending on the earlier of (i) the termination date stated in such written notice, or (ii) the last day of the calendar year in which written notice of termination is provided. The amount of said bonus, if any, will be paid to Employee pursuant to the terms and customary operations of the Management Incentive Program (or other applicable bonus program) except that Employee’s performance will be deemed at target while actual performance of Corporation will be applied, and will be calculated on a pro rata basis, using the number of days Employee was actually employed by Corporation during the calendar year in which Employee provides such written notice of termination;

(c)continue to honor all Equity Awards, subject to the terms thereof, which have been granted to Employee and are fully vested prior to the termination date stated in said written notice;

(d)pay Employee, and if elected by Employee, her spouse such retirement benefits as are provided for in the Supplemental Executive Retirement Plan (the “SERP”) under Paragraph 9 thereof. For purposes of this subparagraph, Employee shall continue to accrue “credited service” as an employee under the SERP up through her Actual Termination Date; provided, these provisions shall not affect the timing or form of her SERP distributions, which shall be determined solely under the terms of the SERP.

(2)In the event such termination by Employee shall be for "good reason" (as defined in Paragraph 18 hereof), and if Employee timely signs and does not revoke a release as provided in subparagraph G of Paragraph 13, Corporation shall be obligated to provide Employee with the payments, benefits and rights in a manner, at such times and in such forms as specified in subparagraphs A(2)(a)-(d) of this Paragraph 13.

(3)In the event (i) such termination by Employee shall be without "good reason" (as defined in Paragraph 18 hereof) and (ii) Corporation determines that Employee’s post-employment activities violate, or will be in violation of, the Covenants of Paragraphs 15 and/or 16,

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then Corporation shall not be obligated to make or provide any further payments or benefits to Employee under this Agreement except as herein provided in this subparagraph.

(a)subject to Corporation's rights under Paragraphs 15 and 16, Corporation shall pay Employee her base salary due her under Paragraph 5 of this Agreement up to her Actual Termination Date;

(b)Subject to Corporation's rights under Paragraphs 15 and 16 hereof, Corporation shall continue to honor all Equity Awards, subject to the terms thereof, which have been granted to Employee and are fully vested prior to the termination date stated in said written notice.

C.Termination while disabled. If Employee is totally disabled at the time any such notice of termination is given, then notwithstanding the provisions of this Paragraph 13, Corporation shall nevertheless continue to pay Employee, as her sole compensation hereunder, the compensation and other benefits for the remaining period of Employee's total disability as provided for in Paragraph 12 hereinabove. It is understood that in no event shall such disabled Employee be entitled to compensation under this Paragraph 13 in addition to the continuation of her compensation under Paragraph 12.

D.Cooperation After Notice of Termination. Following any such notice of termination, Employee shall fully cooperate with Corporation in all matters relating to the winding up of her pending work on behalf of Corporation and the orderly transfer of any such pending work to other employees of Corporation as may be designated by the Corporation’s Chief Executive Officer; and to that end, Corporation shall be entitled to full-time services of Employee through her Actual Termination Date and such full-time or part-time services of Employee as Corporation may reasonably require during all or any part of the sixty (60)-day period that follows her Actual Termination Date; provided, the parties acknowledge that, depending on the level of services so required, the provision of such services may delay the timing of Employee’s separation from service.

E.Separation from Service. The term “separation from service” when used in this Agreement shall mean that Employee separates from service with Corporation and all affiliates, as defined in Code Section 409A and guidance issued thereunder (“Section 409A”). As a general overview of Section 409A’s definition of “separation from service”, an employee separates from service if the employee dies, retires, or otherwise has a termination of employment with all affiliates, determined in accordance with the following:

(1)Leaves of Absence. The employment relationship is treated as continuing intact while the employee is on military leave, sick leave, or other bona fide leave of absence if the period of such leave does not exceed six (6) months, or, if longer, so long as the employee retains a right to reemployment with an affiliate under an applicable statute or by contract. A leave of absence constitutes a bona fide leave of absence only while there is a reasonable expectation that the employee will return to perform services for an affiliate. If the period of leave exceeds six (6) months and the employee does not retain a right to reemployment under an applicable statute or by contract, the employment relationship is deemed to terminate on

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the first date immediately following such six (6)-month period. Notwithstanding the foregoing, where a leave of absence is due to any medically determinable physical or mental impairment that can be expected to result in death or can be expected to last for a continuous period of not less than six (6) months, where such impairment causes the employee to be unable to perform the duties of his or her position of employment or any substantially similar position of employment, a twenty-nine (29)-month period of absence shall be substituted for such six (6)-month period.

(2)Status Change. Generally, if an employee performs services both as an employee and an independent contractor, the employee must separate from service both as an employee and as an independent contractor pursuant to standards set forth in Treasury Regulations to be treated as having a separation from service. However, if an employee provides services to affiliates as an employee and as a member of the Board of Directors, the services provided as a director are not taken into account in determining whether the employee has a separation from service as an employee for purposes of this Agreement.

(3)Termination of Employment. Whether a termination of employment has occurred is determined based on whether the facts and circumstances indicate that the employer and the employee reasonably anticipate that (A) no further services will be performed after a certain date, or (B) the level of bona fide services the employee will perform after such date (whether as an employee or as an independent contractor) will permanently decrease to less than fifty percent (50%) of the average level of bona fide services performed (whether as an employee or an independent contractor) over the immediately preceding thirty-six (36)-month period. Facts and circumstances to be considered in making this determination include, but are not limited to, whether the employee continues to be treated as an employee for other purposes (such as continuation of salary and participation in employee benefit programs), whether similarly-situated service providers have been treated consistently, and whether the employee is permitted, and realistically available, to perform services for other service recipients in the same line of business. For periods during which an employee is on a paid bona fide leave of absence and has not otherwise terminated employment as described in subparagraph (1) above, for purposes of this subparagraph, the employee is treated as providing bona fide services at a level equal to the level of services that the employee would have been required to perform to receive the compensation paid with respect to such leave of absence. Periods during which an employee is on an unpaid bona fide leave of absence and has not otherwise terminated employment are disregarded for purposes of this subsection (including for purposes of determining the applicable thirty-six (36)-month period).

F.Separate Payments. Each payment made to Employee pursuant to this Paragraph 13 or Paragraph 18 shall be treated as a separate payment for purposes of Code Section 409A.

G.Release Requirement. As a condition to Employee receiving any pay or benefits under subparagraph A(2) or B(2) of this Paragraph 13 or under Paragraph 18 (as applicable), Employee must sign (and not revoke) a written release agreement (“Release”) containing any terms specified by Corporation for (i) Employee’s release of Corporation and its affiliates from all claims arising from Employee’s employment or termination, (ii) Employee’s non-revocation of that release during the seven (7)-day period applicable to age-based claims,

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and (iii) Employee’s promise to comply with specified confidentiality, noncompetition and/or nonsolicitation provisions. Corporation will terminate Employee’s eligibility for severance pay and benefits if she fails to sign, if she revokes, or if she fails to follow the terms of this Release and if it is not signed and returned to Corporation within the earlier of (i) the deadline specified by Corporation, or (ii) sixty (60) days after Employee’s Actual Termination Date (or Termination Date for purposes of Paragraph 18). Employee must sign the Release after her Actual Termination Date (or Termination Date for purposes of Paragraph 18). In the event that any payment under subparagraph A(2) or B(2) of this Paragraph 13 or under Paragraph 18 (as applicable) is not exempt from Code Section 409A, the payment timing is based on the signing of this Release, and the period in which Employee could timely sign and return the release spans two (2) calendar years, such payment shall in all events be made in the second such calendar year. Notwithstanding the foregoing, if the payment timing of any portion of payments or benefits, which rely solely on the short-term deferral rule to be exempt from Code Section 409A, would be delayed beyond the short-term deferral rule period due to Employee’s late signing of the Release, such portion shall be forfeited.

14.Death of Employee. In the event of Employee's death during the term of this agreement or any extension hereof, this Agreement shall terminate immediately, and Employee's estate shall be entitled to receive terminal pay in an amount equal to the amount of Employee's base salary and any performance bonus compensation actually paid by Corporation to Employee during the last thirty-six (36) months of her life, said terminal pay to be paid in thirty-six (36) equal monthly installments beginning on the first day of the month next following the month during which Employee's death occurs. If the Employee's death occurs before she has been employed for thirty-six (36) months, the terminal pay shall be based on an amount equal to the Employee's base salary and any performance bonus actually paid by Corporation to Employee during the period of her employment plus the amount of base salary and performance bonus the Employee would have been paid had she survived for the full initial thirty-six (36)-month period. Terminal pay as herein provided for in this Paragraph shall be in addition to amounts otherwise receivable by Employee or her estate under this or any other agreements with Corporation or under any employee benefits or retirement plans established by Corporation and in which Employee is participating at the time of her death. In addition, Corporation shall honor all Equity Awards, subject to the terms thereof, granted to Employee prior to her death; and Employee or her estate shall, if not otherwise vested, become fully vested in said options as of the date of Employee's death. For purposes of this Paragraph, Employee shall, upon her death, be given such additional "credited service" as necessary to fully qualify Employee under Corporation's Supplemental Executive Retirement Plan (SERP) and to provide a survivor annuity to Employee's spouse under the Plan. If upon Employee’s death Employee was not eligible for (at least) an early retirement benefit under SERP, benefits will be payable under the SERP the amount of which shall be determined as if Employee’s date of death was her Early Retirement Date (as such term is defined in SERP); provided, these provisions shall not affect the timing or form of her SERP distributions, which shall be determined solely under the terms of the SERP.

15.Covenants not to compete and not to disclose confidential information and trade secrets.

A.Covenant against competition. During employment and for a twenty-four (24)-month period after Employee’s Actual Termination Date (or Termination Date for purposes of Paragraph 18) resulting from (i) Employee’s voluntary termination without “good reason” (as

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defined in Paragraph 18), or (ii) Corporation’s termination of Employee for “good cause” (as defined in Paragraph13), Employee will not, on her own behalf, or on behalf of any other person or entity, compete with Aflac and its affiliated companies (the ”Aflac Companies”) by providing in the Restricted Territory (as defined in subparagraph A(3) of this Paragraph 15) to any Competing Business (as defined in subparagraph A(2) of this Paragraph 15), services similar to those Employee provided to the Aflac Companies with respect to the Aflac Business (as defined in subparagraph A(1) of this Paragraph 15), in circumstances in which Employee’s responsibilities and duties are substantially similar to those performed by her during the 24-month period ending on her Actual Termination Date.

(1)“Aflac Business” means the Aflac Companies’ insurance company business, which the Aflac Companies operate throughout the United States (including the District of Columbia, Puerto Rico, the U.S. Virgin Islands and Guam) and throughout Japan, and which includes but is not limited to (i) the development, underwriting marketing, distribution and sale of individual and group voluntary insurance products, including .accident, cancer and other specified diseases, dental, hospital confinement indemnity, hospital confinement sickness indemnity, hospital intensive care, life, annuities, lump sum cancer, lump sum cancer critical illness, specified health event, short term disability and vision; (ii) the offering of un-reimbursed medical, dependent care, and transportation flexible spending accounts; and (iii) operating a private medical and insurance product exchange and similar enrollment services. “Aflac Business” will also include any additional insurance and reimbursement account products and services, which become part of the business conducted by the Aflac Companies, whether through acquisition and/or development, and in which or to which Employee has had direct exposure in her position with the Aflac Companies. Similarly, “Aflac Business” will not include any business operation, which formerly was part of the business conducted by the Aflac Companies and which ceased being a part thereof due to divestiture or discontinuation of that part of the business.

(2)“Competing Business” means any person, concern or entity, which is engaged in, or conducts a business substantially the same as, the Aflac Business or any part thereof.

(3)“Restricted Territory” means the area within the United States (including the District of Columbia, Puerto Rico, the U.S. Virgin Islands and Guam) and Japan.

B.Covenant against disclosure of confidential information and trade secrets. Employee acknowledges that, during the term of her employment under this Agreement, Employee will be privy to (i) certain confidential and proprietary information of Aflac Companies, which constitutes trade secrets as defined in the Georgia Trade Secret Act of 1990 (the “Trade Secret Act”), and (ii) certain other confidential and proprietary information of Corporation that may not constitute trade secrets as so defined. With respect to such Trade Secrets and other confidential and proprietary information, Employee covenants and agrees, as follows:

(1)Employee agrees to not disclose to any third party, without the prior written consent of Corporation’s Chief Executive Officer or unless necessary to perform her duties and responsibilities hereunder, the processes, machines, technical documentation,

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computer programs, customer lists, identity of customers, business plans, marketing plans and techniques, pricing data, financial data, marketing programs, customer files, financial institution files, technical expertise and know how, and other confidential and proprietary information and trade secrets, whether as defined in the Trade Secret Act or which may lie beyond it (collectively, the “Property”), which have been or will be provided to Employee by any of the Aflac Companies and are confidential and proprietary property of any of the Aflac Companies. Employee further agrees not to use any Property to her personal benefit or the benefit of any third party. Employee also agrees to return to Corporation all such Property which is tangible upon or before her Actual Termination Date. Notwithstanding the foregoing, the Property protected hereunder will not include any data or information that has been disclosed to the public (except where such public disclosure has been made by Employee without authorization), that has been independently developed and disclosed by others, or that otherwise enters the public domain through lawful means. The restrictions in this Paragraph are in addition to, and not in lieu of, any rights or remedies Corporation may have available pursuant to the laws of the State of Georgia to prevent the disclosure of trade secrets and proprietary information, with such laws including but not limited to the Trade Secrets Act.

(2)Employee’s obligations under the nondisclosure provisions in this Paragraph 15.B (i) will apply to Property that does not constitute trade secrets during the term of Employee’s employment hereunder and for as long as the Property remains confidential, and (ii) will apply to Property that constitutes trade secrets until such Property no longer constitutes trade secrets and is no longer confidential.

16.Enforcement of restrictive covenants.

A.Blue Penciling. The parties agree that if any court finds that any provision in Paragraph 15 or this Paragraph 16 is overly broad such that it is unenforceable under applicable state law, the court may reform that provision to narrow its scope to the extent necessary to render it enforceable.

B.Severability. Employee acknowledges and agrees that the covenant against competition and the covenant against disclosure contained in Paragraphs 15.A and 15.B, respectively, are reasonable and valid and do not impose limitations greater than those that are necessary to protect the business interests and confidential information of the Aflac Companies. The parties agree that the invalidity or unenforceability of any one or more of such covenants, other provisions, or parts thereof (collectively the “Covenants”) will not affect the validity or enforceability of the other Covenants, all of which are inserted conditionally on their being valid in law. In the event one or more Covenants contained herein are ruled invalid (after application of subparagraph A of this Paragraph), this Agreement will be construed as if such invalid Covenant had not been inserted. The parties hereto agree that the Covenants contained in this Agreement are severable and divisible; that none of such Covenants depends on any other Covenant for its enforceability; that such Covenants constitute enforceable obligations between the parties; that each such Covenant will be construed as an agreement independent of any other Covenant of this Agreement; and that the existence of any claim or cause of action by one party to this Agreement against the other party to this Agreement, whether predicated on this

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Agreement or otherwise, will not constitute a defense to the enforcement by any party to this Agreement of any such Covenant.

C.Injunctive Relief. Employee hereby agrees that any remedy at law for any breach of the Covenants will be inadequate and that any of the Aflac Companies will be entitled to apply for injunctive relief in addition to any other remedy the Aflac Companies might have under this Agreement.

D.Claim for Damages. Employee acknowledges that, in addition to seeking injunctive relief, any of the Aflac Companies may bring a cause of action against her for any and all losses, liabilities, damages, deficiencies, costs (including, without limitation, court costs), and expenses (including, without limitation, reasonable attorneys’ fees), incurred by the Aflac Companies and arising out of or due to my breach of any Covenant or agreement contained in Paragraph 15. Notwithstanding anything herein to the contrary, the breach of any Covenant will cause Employee to forfeit any and all payments otherwise due under subparagraphs A(1), B(1) and B(3) (as applicable) of Paragraph 13, and the breach of the nondisclosure Covenant set forth in Paragraph 15.B will cause Employee to forfeit any and all payments otherwise due under subparagraphs A(2) and B(2) (as applicable) of Paragraph 13; and Employee agrees to repay to the Aflac Companies any amount already paid under such applicable subparagraph.

E.Survival. Paragraph 15 and this Paragraph 16, to the extent applicable, will survive the termination of this Agreement and Employee’s employment. In addition, neither the termination of this Agreement nor Employee’s employment will terminate any other obligations or rights that, by the specific terms of this Agreement, extend beyond such termination.

17.Right to acquire insurance. If Employee shall terminate her employment hereunder for any reason other than death, she may, at her election, acquire any insurance policies upon her life owned by the Corporation by giving written notice of her election to Corporation within ninety (90) days after her termination of employment. Such policies shall be transferred to the Employee upon her payment to Corporation of the then interpolated terminal reserve value of said insurance. In the event any policies transferred to Employee as herein provided shall not have an interpolated terminal reserve value, then the amount to be paid by Employee shall be its then fair market value.

18.Change in control.

A.In general. In the event there is a Change in Control (as defined in this Paragraph) of Corporation, this Agreement shall, in order to help eliminate the uncertainties and concerns which may arise at such time, be automatically extended upon all of the same terms and provisions contained herein, for an additional period of three (3) years, beginning on the first day of the month during which such Change in Control shall occur.

B.Notwithstanding the term of subparagraph A(2) and (B)(2) of Paragraph 13, and in lieu of the obligations of the Corporation under such paragraph, if, after a Change in Control

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Employee's employment is terminated by Corporation without "good cause" (as defined in Paragraph 13), or is terminated by Employee for "good reason" (as defined in Paragraph 18), any such termination by Corporation to be made only in accordance with the requirements specified by Paragraph 13.A, Employee shall be entitled to the following if Employee timely signs and does not revoke a release as provided in subparagraph G of Paragraph 13:

(1)In a manner, at such times and in such forms as provided in Paragraph13.A(1) Corporation shall pay Employee’s full base salary to Employee through the date of termination stated in Corporation’s written notice required pursuant to Paragraph 13.A hereof (hereinafter in this Paragraph the “Termination Date”) at the rate in effect on the date such notice is given and, additionally, shall pay Employee all compensation and benefits payable to Employee under the terms of any compensation or benefit plan, program or arrangement maintained by Corporation during such period through the Termination Date.

(2)The Corporation shall pay Employee all compensation and benefits due Employee under Corporation's retirement, insurance and other compensation or benefit plans, programs of arrangements as such payments become due. The amount of such compensation and benefits shall be determined under, and paid in accordance with, Corporation's retirement, insurance and other compensation or benefit plans, programs and arrangements.

(3)In lieu of any further salary payments to Employee for periods subsequent to the Termination Date, the Corporation shall pay to Employee, immediately after the Termination Date, a lump sum payment, in cash, equal to three (3) times the sum of (i) Employee’s annual base salary in effect immediately prior to the Change in Control and (ii) the higher of the amount paid to Employee pursuant to the Corporation’s Management Incentive Plan (or any successor plan thereto) for the year preceding the year in which the Termination Date occurs or paid in the year preceding the year in which the Change in Control occurs; provided, if Employee’s separation from service occurs more than twenty-four (24) months after the Change in Control, only the portion of such lump-sum severance payment in excess of the total amount that would have been payable under Paragraphs 13.A(2)(a) and (b) shall be paid pursuant to the terms hereinabove, and the remainder shall be paid pursuant to the terms of Paragraphs 13.A(2)(a) and (b) as if no Change in Control had occurred; and, provided further, such amount will be paid upon the day after the six (6)-month anniversary of Employee’s separation from service; provided further, if upon her Termination Date Employee has attained her Maximum Retirement Benefit Date, no amount shall be payable under this subparagraph 3.

(4)The Corporation shall pay to Employee, immediately after the Termination Date, a lump sum amount, in cash, equal to a pro rata portion (based on the number of days Employee is an employee during the year in which the Termination Date occurs) of the aggregate value of the maximum annual amount of all contingent incentive compensation awards to Employee for all uncompleted periods under the Corporation's Management Incentive Plan (or successor plan thereto); provided, to the extent any amount of such lump sum payable after the Termination Date is not exempt from Section 409A, such amount will be paid upon the day after the six (6)-month anniversary of Employee’s separation from service.

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(5)For a thirty-six (36)-month period after Employee’s separation from service, Corporation shall provide Employee with life, disability, accident and health insurance benefits substantially similar to and equal or greater in economic value than such benefits which Employee is receiving immediately prior to the Termination Date (without giving effect to any reduction in such benefits subsequent to a Change in Control which reduction in benefits would constitute “good reason” as defined in this Paragraph). Benefits required to be provided to Employee pursuant to this subparagraph B(5) shall be reduced to the extent comparable benefits are actually received by or made available to Employee without cost during such thirty-six (36)-month period and any such benefit actually received by Employee shall be reported to Corporation by Employee.

Notwithstanding the foregoing, with respect to any of such life and/or disability benefits that are fully insured, in lieu of providing such benefits for such period, Corporation shall pay Employee a lump-sum amount equal to the cost of such benefits on a post-employment basis for such thirty-six (36)-month period; provided, any such cash payment shall be made as soon as practicable after Employee’s separation from service, with any amount that is not exempt from Section 409A and that is otherwise payable within the six (6)-month period beginning on the date of her separation from service being paid upon the day after the six (6)-month anniversary of her separation from service.

C.In addition to the payments provided for in subparagraph B of this Paragraph 18, in the event that after a Change in Control Employee's employment by the Corporation is terminated by the Corporation without "good cause" or by Employee for "good reason," the Corporation shall continue to honor all Equity Awards granted to Employee (subject to the terms of such awards) prior to the Termination Date, and all Equity Awards granted to Employee prior to her Actual Termination Date shall become fully vested and exercisable (and to the extent applicable (e.g., with respect to any restricted stock units or similar awards) payable, as of the Termination Date; provided, any Equity Awards that vest based on performance will vest as if the maximum performance under the performance criteria had been satisfied.

D.Notwithstanding any other provisions of this Agreement, in the event that any payment or benefit received or to be received by Employee in connection with a Change in Control or the termination of Employee’s employment (whether pursuant to the terms of this Agreement or any other plan, arrangement or agreement with the Corporation, any person whose actions result in a Change in Control or any person affiliated with the Corporation or such person) (all such payments and benefits being hereinafter called “Total Payments”) would not be deductible (in whole or in part) by the Corporation, an affiliate or person making such payment or providing such benefit as a result of Section 280G of the Internal Revenue Code of 1986 (the “Code”) then, to the extent necessary to make such portion of the Total Payments deductible (and after taking into account any reduction in the Total Payments provided by reason of Section 280G of the Code in such other plan, arrangement or agreement), adjustments in such payments shall be made as follows: (i) the cash payments provided pursuant to subparagraph B(3) and B(4) of this Paragraph 18 that are exempt from Section 409A shall first be reduced (if necessary, to zero); (ii) then, if further reductions are necessary, benefits provided under subparagraph B(5) of this Paragraph 18 that are exempt from Section 409A shall be reduced (if necessary, to zero);

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(iii) then, if still further reductions are necessary, the cash payments provided pursuant to subparagraph B(3) and B(4) of this Paragraph 18 that are not exempt from Section 409A shall be reduced (if necessary, to zero); and (iv) finally, if still further reductions are necessary, all of the benefits provided under subparagraph B(5) of this Paragraph 18 that are not exempt from Section 409A shall be forfeited. For purposes of this limitation (i) no portion of the Total Payments, the receipt or enjoyment of which Employee shall have effectively waived in writing prior to the date of termination of employment shall be taken into account (provided that, in no event will any such waiver impermissibly affect any portion of the Total Payments that is subject to Section 409A), (ii) no portion of the Total Payments shall be taken into account which in the opinion of the tax counsel selected by the Corporation’s independent auditors and reasonably acceptable to Employee does not constitute a “parachute payment” within the meaning of Section 280G(b)(2) of the Code, including by reason of Section 280G(b)(4)(A) of the Code, (iii) except as provided in clause (iv) above, the payments and benefits be reduced only to the extent necessary so that the Total Payments (other than those referred to in clauses (i) or (ii)) in their entirety constitute reasonable compensation for services actually rendered within the meaning of Section 280G(b)(4)(B) of the Code or are otherwise not subject to disallowance as deductions, in the opinion of the tax counsel referred to in clause (ii); and (iv) the value of any non-cash benefit or any deferred payment or benefit included in the Total Payments shall be determined by the Corporation’s independent auditors in accordance with the principles of Sections 280G(d)(3) and (4) of the Code. In no event shall the Corporation’s obligation to continue to honor all Equity Awards granted to Employee prior to the Termination Date nor the vesting of Equity Awards in accordance with Paragraph 18.C hereof be affected by this Paragraph 18.D.

E.Definitions.

(1)“Change in Control” means a change in ownership or effective control of Corporation or a change in the ownership of a substantial portion of the assets of Corporation, all within the meaning of Section 409A. As a general overview, Section 409A’s definition of these terms, and the dates as of which they occur, are as follows:

(a)The date any one person, or more than one person acting as a group, acquires ownership of stock of Corporation that, together with stock held by such person or group constitutes more than fifty percent (50%) of the total voting power of the stock of Corporation. However, if any one person, or more than one person acting as a group, is considered to own more than fifty percent (50%) of the total fair market value or total voting power of the stock of Corporation, the acquisition of additional stock by the same person or persons is not considered to cause a change in the ownership of Corporation or to cause a change in the effective control of Corporation.

(b)The date any one person, or more than one person acting as a group, acquires (or has acquired during the twelve (12)-month period ending on the date of the most recent acquisition by such person or persons) ownership of stock of Corporation possessing thirty percent (30%) or more of the total voting power of the stock of Corporation.

17

(c)The date that any one person, or more than one person acting as a group acquires (or has acquired during the twelve (12)-month period ending on the date of the most recent acquisition by such person or persons) assets from Corporation that have a total gross fair market value equal to or more than forty percent (40%) of the total gross fair market value of all of the assets of Corporation immediately before such acquisition or acquisitions.

(d)The date a majority Corporation’s board of directors is replaced during any twelve (12)-month period by directors whose appointment or election is not endorsed by a majority of the members of Corporation’s board of directors before the date of the appointment or election.

(2)“Good reason” shall mean the termination of employment by Employee upon the occurrence of any one or more of the following events to the extent that there is, or would be if not corrected, a material negative change in Employee’s employment relationship with Corporation:

(a)A material breach by Corporation of the terms and conditions of this Agreement affecting Employee’s salary and bonus compensation, any employee benefit, Equity Awards or the loss of any of Employee’s titles or positions with Corporation;

(b)A significant diminution of Employee’s duties and responsibilities;

(c)The assignment to Employee of duties significantly inconsistent with or different from her duties and responsibilities existing at the time of a Change in Control;

(d)A purported termination of Employee’s employment by Corporation other than as permitted by this Agreement;

(e)The relocation of Corporation’s principal office or of Employee’s own office to any place beyond twenty-five (25) miles from the current principal office of Corporation in Columbus, Georgia; and

(f)The failure of any successor to Corporation to expressly assume and agree to discharge Corporation’s obligations to Employee under this Agreement as extended under this Paragraph, in form and substance satisfactory to Employee.

Notwithstanding the foregoing, Employee shall have good reason under this Agreement only if (i) Employee provides Corporation, within ninety (90) days of the occurrence of the event giving rise to the notice, a written notice indicating the specific good reason provision(s) in this Agreement relied upon, setting forth in reasonable detail the facts and circumstances claimed to provide a basis for good reason, and indicating a date of termination of

18

employment (not less than thirty (30) nor more than sixty (60) days after the date such notice is given); and (ii) such facts and circumstances are not substantially corrected by Corporation prior to the date of termination specified by Employee in such notice. Any failure by Employee to set forth in a notice of good reason any facts or circumstances which contribute to the showing of good reason shall not waive any right of Employee hereunder or preclude Employee from asserting such fact or circumstances in enforcing her rights hereunder.

19.No requirement to seek employment and no offset. Corporation agrees that, if Employee's employment is terminated by Corporation during the term of this Agreement or by Employee for "good reason" during the term of this Agreement, Employee is not required to seek other employment or attempt in any way to reduce the amounts payable to Employee by Corporation pursuant to the applicable terms of this Agreement; it being understood and agreed that the amount of any payment or benefit to Employee provided for hereunder shall not be reduced by any compensation or other benefits earned by Employee as a result of her employment by another employer or, after a Change in Control, by Corporation's attempt to offset any amount claimed to be owed by Employee to Corporation or otherwise.

20.Waiver of breach or violation not deemed continuing. The waiver by either party of a breach or violation of any provision of this Agreement shall not operate as or be construed to be a waiver of any subsequent breach hereof.

21.Notices. Any and all notices required or permitted to be given under this Agreement will be sufficient if furnished in writing, sent by registered or certified mail to her last known residence in the case of Employee or to its principal office in Columbus, Georgia, in the case of the Corporation.

22.Authority. The provisions of this Agreement required to be approved by the Board of Directors of Corporation or the Compensation Committee of the Board have been so approved and authorized.

23.Arbitration. From time-to-time, Employee agrees to sign and become a party to any arbitration agreement with such terms as Corporation may provide, and the terms of such arbitration agreement shall be incorporated herein by this reference and shall apply to all claims under this Agreement; provided, notwithstanding the foregoing, any claims or actions, whether for damages, injunctive relief or other relief, for any violation or breach of the Covenants set forth in Paragraphs 15 and 16, including but not limited to the actions described in subparagraphs C and D of Paragraph 16, (i) shall be excluded from the arbitration agreement and its applicability, and (ii) shall be subject to the jurisdiction of the applicable court as set forth in Paragraph 24.

/s/ DPA	/s/ ABJ
Initials for Corporation	Initials of Employee

24.Governing Law. This Agreement shall be interpreted, construed and governed according to the laws of the State of Georgia. Any legal action brought in regard to this Agreement, which is not subject to arbitration as provided in Paragraph 23 or is brought to

19

enforce the finding of the arbitrator, shall be brought in the Superior Court of Muscogee County, Georgia, or the United States District Court of the Southern District of Georgia, whichever applies, and the parties waive jurisdiction and venue in any other court.

25.Paragraph Headings. The paragraph headings contained in this Agreement are for convenience only and shall in no manner be construed as part of this Agreement.

26.Two originals. This Agreement is executed in two (2) originals, each of which shall be deemed an original and together shall constitute one and the same Agreement, with one original being delivered to each party hereto.

27.Code Section 409A. This Agreement is intended to comply with the requirements of Code Section 409A and shall be construed accordingly. Any payments or distributions to be made to Employee under this Agreement upon a “separation from service” (as defined above) of amounts classified as “nonqualified deferred compensation” for purposes of Code Section 409A, payable due to a separation from service and not exempt from Section 409A, shall in no event be made or commence until six (6) months after such separation from service. Each payment of nonqualified deferred compensation under this Agreement shall be treated as a separate payment for purposes of Code Section 409A. Notwithstanding the foregoing, Corporation shall not be liable to Employee or any other person if the Internal Revenue Service or any court determines for any reason that any payments under this Agreement are subject to taxes or penalties under Section 409A.

28.Tax Withholding. Corporation shall withhold all applicable taxes from any amounts payable under this Agreement, including, but not limited to, any federal, foreign, state and local taxes; and all such amounts described in this Agreement shall be paid net of such taxes.

29.Amendments and Waivers. Except as otherwise specified herein, this Agreement may be amended, and the observance of any term of this Agreement may be waived (either generally or in a particular instance and either retroactively or prospectively), only with the written consent of Corporation and Employee.

20

IN WITNESS WHEREOF, Corporation has hereunto caused its name to be signed and its seal to be affixed by its duly authorized officers, and Employee has hereunto set her hand and seal, all being done in duplicate originals, with one original being delivered to each party as of the 11^th day of June, 2015.

	AFLAC INCORPORATED
/s/ Audrey Boone Tillman	BY:	/s/ Daniel P. Amos
AUDREY BOONE TILLMAN		DANIEL P. AMOS
Employee		Chairman and Chief Executive Officer
/s/ Susan Storey	ATTEST:	/s/ J. Matthew Loudermilk
Witness		J. MATTHEW LOUDERMILK
		VP, Corporate Secretary

21

EX-15

Aflac Incorporated 1st Quarter 2018 10-Q

EXHIBIT 15

May 3, 2018

Aflac Incorporated

Columbus, Georgia

Re: Registration Statement No. 333-219784, and 333-203839 on Form S-3; 333-135327, 333-161269, 333-202781, 333-158969, 333-27883, 333-200570, 333-115105, and 333-219888 on Form S-8

With respect to the subject registration statements, we acknowledge our awareness of the use therein of our report dated May 3, 2018 related to our review of interim financial information.

Pursuant to Rule 436 under the Securities Act of 1933 (the Act), such report is not considered part of a registration statement prepared or certified by an independent registered public accounting firm, or a report prepared or certified by an independent registered public accounting firm within the meaning of Sections 7 and 11 of the Act.

/s/ KPMG LLP

Atlanta, Georgia

EX-31.1

Aflac Incorporated 1st Quarter 2018 10-Q

EXHIBIT 31.1

Certification of Chief Executive Officer

I, Daniel P. Amos, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Aflac Incorporated;

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 officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	May 3, 2018	/s/ Daniel P. Amos
		Daniel P. Amos
		Chairman and Chief Executive Officer

EX-31.2

Aflac Incorporated 1st Quarter 2018 10-Q

EXHIBIT 31.2

Certification of Chief Financial Officer

I, Frederick J. Crawford, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Aflac Incorporated;

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 officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	May 3, 2018	/s/ Frederick J. Crawford
		Frederick J. Crawford
		Executive Vice President, Chief Financial Officer

EX-32

Aflac Incorporated 1st Quarter 2018 10-Q

EXHIBIT 32

Certification of CEO and CFO Pursuant to

18 U.S.C. Section 1350,

as Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q of Aflac Incorporated (the “Company”) for the quarterly period ended March 31, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Daniel P. Amos, as Chief Executive Officer of the Company, and Frederick J. Crawford, as Chief Financial Officer of the Company, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Daniel P. Amos
Name:	Daniel P. Amos
Title:	Chief Executive Officer
Date:	May 3, 2018

/s/ Frederick J. Crawford
Name:	Frederick J. Crawford
Title:	Chief Financial Officer
Date:	May 3, 2018

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 25, 2018
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	AFL
Entity Registrant Name	AFLAC INC
Entity Central Index Key	0000004977
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		774,167,054

XML

Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Revenues:
Net premiums, principally supplemental health insurance		$ 4,745	$ 4,638
Net investment income		837	794
Realized investment gains (losses):
Other-than-temporary impairment losses realized		(7)	(10)
Other gains (losses)	[1]	(127)	(130)
Total realized investment gains (losses)		(134)	(140)
Other income (loss)		16	17
Total revenues		5,464	5,309
Benefits and expenses:
Benefits and claims, net		3,042	3,052
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs		314	294
Insurance commissions		337	328
Insurance and other expenses		733	675
Interest expense		56	62
Total acquisition and operating expenses		1,440	1,359
Total benefits and expenses		4,482	4,411
Earnings before income taxes		982	898
Income taxes		265	306
Net earnings		$ 717	$ 592
Net earnings per share:
Basic (in dollars per share)		$ 0.92	$ 0.74
Diluted (in dollars per share)		$ 0.91	$ 0.73
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic (in shares)		778,550	802,259
Diluted (in shares)		783,852	808,138
Cash dividends per share		$ 0.26	$ 0.22

[1] See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

XML

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings		$ 717	$ 592
Other comprehensive income (loss) before income taxes:
Unrealized foreign currency translation gains (losses) during period		824	375
Unrealized gains (losses) on fixed maturity securities:
Unrealized holding gains (losses) on fixed maturity securities during period	[1]	(1,931)	(526)
Reclassification adjustment for realized (gains) losses on fixed maturity securities included in net earnings	[1]	(2)	16
Unrealized gains (losses) on derivatives during period		6	2
Pension liability adjustment during period		(3)	(2)
Total other comprehensive income (loss) before income taxes		(1,106)	(135)
Income tax expense (benefit) related to items of other comprehensive income (loss)		(763)	(137)
Other comprehensive income (loss), net of income taxes	[2]	(343)	2
Total comprehensive income (loss)		$ 374	$ 594

[1] See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

[2] All amounts in the table above are net of tax.

XML

Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Securities available for sale, at fair value:
Fixed maturities	[1]	$ 89,033
Securities held to maturity, at amortized cost:
Fixed maturities		33,377	$ 31,430
Equity securities, at fair value:
Equity securities	[2],[3]	1,108
Other investments	[4]	5,073	3,402
Cash and cash equivalents		4,080	3,491
Total investments and cash		132,671	123,659
Receivables		906	827
Accrued investment income		745	769
Deferred policy acquisition costs		9,933	9,505
Property and equipment, at cost less accumulated depreciation		448	434
Other	[5]	2,653	2,023
Total assets		147,356	137,217
Policy Liabilities:
Future policy benefits		87,268	81,857
Unpaid policy claims		4,630	4,392
Unearned premiums		6,084	5,959
Other policyholders’ funds		7,417	6,939
Total policy liabilities		105,399	99,147
Income taxes		4,407	4,745
Payables for return of cash collateral on loaned securities		5,368	606
Notes payable		5,372	5,289
Other	[6]	2,523	2,832
Total liabilities		123,069	112,619
Shareholders’ equity:
Common stock of $.10 par value. In thousands: authorized 3,800,000 shares in 2018 and 2017; issued 1,346,776 shares in 2018 and 1,345,762 shares in 2017		135	135
Additional paid-in capital		2,089	2,052
Retained earnings		30,183	29,895
Accumulated other comprehensive income (loss):
Unrealized foreign currency translation gains (losses)		(1,303)	(1,750)
Unrealized gain (losses) on fixed maturity securities	[7],[8]	5,206	5,964
Unrealized gains (losses) on derivatives		(21)	(23)
Pension liability adjustment		(197)	(163)
Treasury stock, at average cost		(11,805)	(11,512)
Total shareholders’ equity		24,287	24,598
Total liabilities and shareholders’ equity		147,356	137,217
Consolidated Entity Excluding Variable Interest Entities (VIE)
Securities available for sale, at fair value:
Fixed maturities	[9]	83,602	78,804
Securities held to maturity, at amortized cost:
Fixed maturities		33,377	31,430
Equity securities, at fair value:
Equity securities	[9]	348
Available-for-sale securities, equity securities	[9]		270
Variable Interest Entity, Consolidated
Securities available for sale, at fair value:
Fixed maturities	[9],[10]	5,431	5,509
Equity securities, at fair value:
Equity securities		760
Available-for-sale securities, equity securities			753
Other investments	[11]	3,994	2,341
Policy Liabilities:
Total liabilities		$ 86	$ 128

[1] Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)

[2] Includes perpetual securities

[3] Includes perpetual securities ($71 at fair value)

[4] Includes $3,994 in 2018 and $2,341 in 2017 of loan receivables and limited partnerships from consolidated variable interest entities

[5] Includes $241 in 2018 and $151 in 2017 of derivatives from consolidated variable interest entities

[6] Includes $86 in 2018 and $128 in 2017 of derivatives from consolidated variable interest entities

[7] See Note 1 for discussion of the accounting treatment of tax on amounts recorded in accumulated other comprehensive income pursuant to the Tax Act and for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

[8] See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

[9] Includes perpetual securities, see Notes 1 and 3 of the Notes to the Consolidated Financial Statements

[10] Includes perpetual securities

[11] Consists of TREs, CMLs, MMLs, and alternative investments in limited partnerships

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Securities available for sale, fixed maturities, amortized cost	[1]	$ 81,607
Securities held to maturity, fixed maturities, fair value		$ 40,468	$ 38,072
Common stock, par value (in dollars per share)		$ 0.1	$ 0.1
Common stock, shares authorized (in shares)		3,800,000,000	3,800,000,000
Common stock, shares issued (in shares)		1,346,776,000	1,345,762,000
Asset derivatives		$ 797	$ 331
Liability derivatives		353	474
Variable Interest Entity, Consolidated
Securities available for sale, fixed maturities, amortized cost	[2],[3]	4,695	4,538
Asset derivatives	[4]	241	151
Liability derivatives	[4]	86	128
Consolidated Entity Excluding Variable Interest Entities (VIE)
Securities available for sale, fixed maturities, amortized cost	[3]	76,912	70,594
Securities held to maturity, fixed maturities, fair value		40,468	38,072
Loan Receivables and Limited Partnerships | Variable Interest Entity, Consolidated
Other investments held in unit trust, net of reserves, amortized cost		$ 3,994	$ 2,341

[1] Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)

[2] Includes perpetual securities

[3] Includes perpetual securities, see Notes 1 and 3 of the Notes to the Consolidated Financial Statements

[4] Consists entirely of derivatives

XML

Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions		Total	Common stock:	Additional paid-in capital:	Retained earnings:	Accumulated other comprehensive income (loss):	Treasury stock:
Balance, beginning of period at Dec. 31, 2016			$ 135	$ 1,908	$ 25,981	$ 2,630	$ (10,172)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options				10
Share-based compensation				12
Treasury stock reissued				10			15
Net earnings		$ 592			592
Dividends to shareholders					(173)
Unrealized foreign currency translation gains (losses) during period, net of income taxes						333
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments	[1]					(331)
Unrealized gains (losses) on derivatives during period, net of income taxes						2
Pension liability adjustment during period, net of income taxes						(2)
Purchases of treasury stock							(610)
Balance, end of period at Mar. 31, 2017		20,340	135	1,940	26,400	2,632	(10,767)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle, net of income taxes | Accounting Standards Update 2016-01	[1]				0	0
Cumulative effect of change in accounting principle, net of income taxes | Accounting Standards Update 2018-02	[1]				0	0
Balance, beginning of period at Dec. 31, 2017		24,598	135	2,052	29,895	4,028	(11,512)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options				14
Share-based compensation				10
Treasury stock reissued				13			16
Net earnings		717			717
Dividends to shareholders					(203)
Unrealized foreign currency translation gains (losses) during period, net of income taxes						447
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments	[1]					(984)
Unrealized gains (losses) on derivatives during period, net of income taxes						2
Pension liability adjustment during period, net of income taxes						(34)
Purchases of treasury stock							(309)
Balance, end of period at Mar. 31, 2018		$ 24,287	$ 135	$ 2,089	30,183	3,685	$ (11,805)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle, net of income taxes | Accounting Standards Update 2016-01	[1]				148	(148)
Cumulative effect of change in accounting principle, net of income taxes | Accounting Standards Update 2018-02	[1]				$ (374)	$ 374

[1] See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018.

XML

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net earnings	$ 717	$ 592
Adjustments to reconcile net earnings to net cash provided by operating activities:
Change in receivables and advance premiums	14	106
Capitalization of deferred policy acquisition costs	(349)	(335)
Amortization of deferred policy acquisition costs	314	294
Increase in policy liabilities	572	666
Change in income tax liabilities	(131)	271
Realized investment (gains) losses	134	140
Other, net	(33)	23
Net cash provided (used) by operating activities	1,238	1,757
Securities available for sale:
Fixed maturity securities sold	433	1,385
Fixed maturity securities matured or called	510	204
Equity securities sold	157	155
Securities held to maturity:
Fixed maturity securities matured or called	50	228
Other investments - loan receivables proceeds	146	34
Costs of investments acquired:
Available for sale fixed maturity securities acquired	(3,975)	(3,726)
Equity securities acquired	(166)	(157)
Other investments, loan receivables acquired	(1,772)	(123)
Other investments, excluding loan receivables. net	(125)	(114)
Settlement of derivatives, net	(1)	(44)
Cash received (pledged or returned) as collateral, net	4,578	654
Other, net	(34)	(23)
Net cash provided (used) by investing activities	(199)	(1,527)
Cash flows from financing activities:
Purchases of treasury stock	(296)	(610)
Proceeds from borrowings	2	524
Principal payments under debt obligations	0	(654)
Dividends paid to shareholders	(195)	(166)
Change in investment-type contracts, net	7	18
Treasury stock reissued	14	11
Other, net	(5)	1
Net cash provided (used) by financing activities	(473)	(876)
Effect of exchange rate changes on cash and cash equivalents	23	(8)
Net change in cash and cash equivalents	589	(654)
Cash and cash equivalents, beginning of period	3,491	4,859
Cash and cash equivalents, end of period	4,080	4,205
Supplemental disclosures of cash flow information:
Income taxes paid	396	58
Interest paid	36	47
Noncash interest	21	15
Impairment losses included in realized investment losses	7	10
Noncash financing activities:
Capital lease obligations	1	2
Associate stock bonus
Treasury stock issued for:
Treasury stock issued	5	6
Shareholder dividend reinvestment
Treasury stock issued for:
Treasury stock issued	8	7
Share-based compensation grants
Treasury stock issued for:
Treasury stock issued	$ 2	$ 1

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Description of Business

Aflac Incorporated (the Parent Company) and its subsidiaries (collectively, the Company) primarily sell supplemental health and life insurance in the United States and Japan. The Company's insurance business is marketed and administered through American Family Life Assurance Company of Columbus (Aflac) in the United States (Aflac U.S.) and as a branch in Japan (Aflac Japan). The conversion of Aflac Japan from a branch to a legal subsidiary was completed on April 1, 2018 (see Note 14), after which date the Company's insurance business is marketed and administered through American Family Life Assurance Company of Columbus (Aflac) in the United States (Aflac U.S.) and through Aflac Life Insurance Japan Ltd. in Japan (Aflac Japan). American Family Life Assurance Company of New York (Aflac New York) is a wholly owned subsidiary of Aflac. Most of Aflac's policies are individually underwritten and marketed through independent agents. Additionally, Aflac U.S. markets and administers group products through Continental American Insurance Company (CAIC), branded as Aflac Group Insurance. The Company's insurance operations in the United States and Japan service the two markets for the Company's insurance business. Aflac Japan's revenues, including realized gains and losses on its investment portfolio, accounted for 71% and 69% of the Company's total revenues in the three-month periods ended March 31, 2018 and 2017, respectively. The percentage of the Company's total assets attributable to Aflac Japan was 85% at March 31, 2018, compared with 83% at December 31, 2017.

Basis of Presentation

The Company prepares its financial statements in accordance with U.S. generally accepted accounting principles (GAAP). These principles are established primarily by the Financial Accounting Standards Board (FASB). In these Notes to the Consolidated Financial Statements, references to U.S. GAAP issued by the FASB are derived from the FASB Accounting Standards Codification^TM (ASC). The preparation of financial statements in conformity with U.S. GAAP requires the Company to make estimates based on currently available information when recording transactions resulting from business operations. The most significant items on the Company's balance sheet that involve a greater degree of accounting estimates and actuarial determinations subject to changes in the future are the valuation of investments and derivatives, deferred policy acquisition costs (DAC), liabilities for future policy benefits and unpaid policy claims, and income taxes. These accounting estimates and actuarial determinations are sensitive to market conditions, investment yields, mortality, morbidity, commission and other acquisition expenses, and terminations by policyholders. As additional information becomes available, or actual amounts are determinable, the recorded estimates will be revised and reflected in operating results. Although some variability is inherent in these estimates, the Company believes the amounts provided are adequate.

The unaudited consolidated financial statements include the accounts of the Parent Company, its subsidiaries and those entities required to be consolidated under applicable accounting standards. All material intercompany accounts and transactions have been eliminated.

In the opinion of management, the accompanying unaudited consolidated financial statements of the Company contain all adjustments, consisting of normal recurring accruals, which are necessary to fairly present the consolidated balance sheets as of March 31, 2018, and December 31, 2017, the consolidated statements of earnings and comprehensive income (loss), shareholders' equity and cash flows for the three-month periods ended March 31, 2018 and 2017. Results of operations for interim periods are not necessarily indicative of results for the entire year. As a result, these financial statements should be read in conjunction with the financial statements and notes thereto included in the Company's annual report on Form 10-K for the year ended December 31, 2017 (2017 Annual Report).

Stock split: On February 13, 2018, the Board of Directors of the Parent Company declared a two-for-one stock split of the Company’s common stock in the form of a 100% stock dividend payable on March 16, 2018 to shareholders of record at the close of business on March 2, 2018. The stock split was payable in the form of one additional common stock share for every share of common stock held. All equity and share-based data, including the number of shares outstanding and per share amounts, have been adjusted to reflect the stock split for all periods presented in this Quarterly Report on Form 10-Q.

Reclassifications: Certain reclassifications have been made to prior-year amounts to conform to current-year reporting classifications. These reclassifications had no impact on net earnings or total shareholders' equity.

Perpetual securities have been reclassified in prior periods from a separate line item to fixed maturity securities to conform to current period reporting classifications. This reclassification had no impact on net earnings or total shareholder’s equity.

New Accounting Pronouncements

Recently Adopted Accounting Pronouncements

Technical Corrections and Improvements to Financial Instruments - Overall: In February 2018, the FASB issued amendments to clarify certain aspects of the guidance issued in the original Financial Instruments - Overall - Recognition and Measurement pronouncement summarized below. Specifically, for entities who have chosen the measurement alternative approach for equity securities without readily determinable fair values, the amendments clarify that entities may change from a measurement alternative approach to a fair value method through an irrevocable election that would apply to a specific equity security and all identical or similar investments of the same issuer; entities should use an observable price at the date of the transaction rather than reporting date for the measurement alternative calculation; and insurance companies should use a prospective transition method when applying the measurement alternative. The amendments are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years beginning after June 15, 2018. All entities may early adopt these amendments for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, as long as they have adopted the Financial Instruments - Overall - Recognition and Measurement guidance discussed below. The Company elected to early adopt this technical correction and improvement guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company’s financial position, results of operations, or disclosures.

Income Statement - Reporting Comprehensive Income - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income: In February 2018, the FASB issued amendments which allow a reclassification from accumulated other comprehensive income (AOCI) to retained earnings of the effects of the change in the U.S. federal income tax rate resulting from the Tax Cuts and Jobs Act (Tax Act) on the gross deferred tax amounts and the corresponding valuation allowances related to items remaining in AOCI. The amendments eliminate the stranded tax effects resulting from the Tax Act and also require certain disclosures about the reclassified tax effects. The amendments are effective for all entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Public business entities may early adopt this guidance in any interim reporting period for which financial statements have not yet been issued. The amendments should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Act is recognized. The Company elected to early adopt this guidance as of January 1, 2018. The amounts reclassified from AOCI to retained earnings include the income tax effects of the change in the federal corporate tax rate enacted by the Tax Act. The Company’s policy is to follow the portfolio approach for releasing income tax effects from AOCI. The adoption of this guidance resulted in an increase to beginning 2018 AOCI of $374 million with a corresponding decrease to beginning 2018 retained earnings as of January 1, 2018.

Compensation - Stock Compensation - Scope of Modification Accounting: In May 2017, the FASB issued amendments to provide guidance clarifying when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. An entity should apply modification accounting if the fair value, vesting conditions or classification of the award (as an equity instrument or liability instrument) changes as a result of the change in terms or conditions of the award. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Compensation - Retirement Benefit - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost: In March 2017, the FASB issued amendments requiring that an employer report the service cost component of net periodic pension cost and net periodic postretirement benefit cost in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net periodic pension cost and net periodic postretirement benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. If a separate line item or items are used to present the other components of net benefit cost, that line item or items must be appropriately described. If a separate line item or items are not used, the line item or items used in the income statement to present the other components of net benefit cost must be disclosed. The amendments in this update also allow only the service cost component to be eligible for capitalization when applicable. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets - Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets: In February 2017, the FASB issued amendments that clarify the scope and accounting guidance for the derecognition of a nonfinancial asset or a financial asset that meets the definition of an "in substance nonfinancial asset." The amendments define an "in substance nonfinancial asset" and provide additional accounting guidance for partial sales of nonfinancial assets. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

Business Combinations - Clarifying the Definition of a Business: In January 2017, the FASB issued amendments clarifying when a set of assets and activities is a business. The amendments provide a screen to exclude transactions where substantially all the fair value of the transferred set is concentrated in a single asset, or group of similar assets, from being evaluated as a business. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Statement of Cash Flows - Restricted Cash: In November 2016, the FASB issued amendments requiring that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory: In October 2016, the FASB issued amendments that require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments: In August 2016, the FASB issued amendments that provide guidance on eight specific statement of cash flows classification issues. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

Financial Instruments - Overall - Recognition and Measurement of Financial Assets and Financial Liabilities: In January 2016, the FASB issued guidance to address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The main provisions of this guidance require certain equity investments to be measured at fair value with changes in fair value recognized in net earnings; separate presentation in other comprehensive income for changes in fair value of financial liabilities measured under the fair value option that are due to instrument-specific credit risk; and changes in disclosures associated with the fair value of financial instruments. The guidance also clarifies that entities should evaluate the need for a valuation allowance on a deferred tax asset (DTA) related to available-for-sale (AFS) securities in combination with the entity's other DTAs. The Company adopted this guidance as of January 1, 2018. The Company recorded a cumulative effect adjustment with an increase to beginning 2018 retained earnings and a decrease to beginning 2018 AOCI of $148 million, net of taxes.

Revenue from Contracts with Customers: In May 2014, the FASB issued updated guidance that affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (e.g., insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Accounting Pronouncements Pending Adoption

Leases - Land Easement Practical Expedient for Transition to Topic 842: In January 2018, FASB issued guidance which provides an entity with the option to elect a transition practical expedient to not evaluate, under Topic 842, land easements that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. The amendments clarify that new or modified land easements should be evaluated under the new leases standard once an entity has adopted the new standard. The amendments are effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on the Company's financial position, results of operations, or disclosures.

Derivatives and Hedging - Targeted Improvements to Accounting for Hedging Activities: In August 2017, FASB issued guidance which improves and simplifies the accounting rules around hedge accounting and will create more transparency around how economic results are presented on financial statements. Issues addressed in this new guidance include: 1) risk component hedging, 2) accounting for the hedged item in fair value hedges of interest rate risk, 3) recognition and presentation of the effects of hedging instruments, and 4) amounts excluded from the assessment of hedge effectiveness. The amendments are effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted in any interim period after issuance of the guidance. The adoption of this guidance is not expected to have a significant impact on the Company's financial position, results of operations, or disclosures.

Receivables - Nonrefundable Fees and Other Costs - Premium Amortization on Purchased Callable Debt Securities: In March 2017, the FASB issued amendments to shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount. The amendments are effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The adoption of this guidance is not expected to have a significant impact on the Company's financial position, results of operations, or disclosures.

Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment: In January 2017, the FASB issued amendments simplifying the subsequent measurement of goodwill. An entity, under this update, is no longer required to perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, the entity should perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. The amendments are effective for public business entities that are SEC filers for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for any goodwill impairment tests performed on testing dates after January 1, 2017. The Company does not expect the adoption of this guidance to have a significant impact on its financial position, results of operations, or disclosures.

Financial Instruments - Credit Losses - Measurement of Credit Losses on Financial Instruments: In June 2016, the FASB issued amendments that require a financial asset (or a group of financial assets) measured on an amortized cost basis to be presented net of an allowance for credit losses in order to reflect the amount expected to be collected on the financial asset(s). The measurement of expected credit losses is amended by replacing the incurred loss impairment methodology in current U.S. GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform about a credit loss. Credit losses on available-for-sale debt securities will continue to be measured in a manner similar to current U.S. GAAP; however, the amendments require that credit losses be presented as an allowance rather than as a write-down. Other amendments include changes to the balance sheet presentation and interest income recognition of purchased financial assets with a more-than-insignificant amount of credit deterioration since origination (PCD financial assets).

The amendments are effective for public companies for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Companies may early adopt this guidance as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The amendments will be adopted following a modified-retrospective approach resulting in a cumulative effect adjustment in retained earnings as of the beginning of the year of adoption. Two exceptions to this adoption method are for PCD financial assets and debt securities for which other-than-temporary impairment (OTTI) will have been recognized before the effective date. Loans purchased with credit deterioration accounted for under current U.S. GAAP as "purchased credit impaired" (PCI) financial assets will be classified as PCD financial assets at transition and PCD guidance will be applied prospectively. Debt securities that have experienced OTTI before the effective date will follow a prospective adoption method which allows an entity to maintain the same amortized cost basis before and after the effective date.

The Company has identified certain financial instruments in scope of this guidance to include certain fixed maturity securities, loan and loan receivables and reinsurance recoverables (See Notes 3 and 7 for current balances of instruments in scope). The Company is continuing its progress towards updating its credit loss projection models and accounting systems in order to comply with the required changes in measurement of credit losses. The Company currently expects loans and loan receivables and held-to-maturity fixed maturity securities to be the asset classes most significantly impacted upon adoption of the guidance. The Company continues to evaluate the impact of adoption of this guidance on its financial position, results of operations, and disclosures.

Leases: In February 2016, the FASB issued updated guidance for accounting for leases. Per the amendments, lessees will be required to recognize all leases on the balance sheet with the exception of short-term leases. A lease liability will be recorded for the obligation of a lessee to make lease payments arising from a lease. A right-of-use asset will be recorded which represents the lessee’s right to use, or to control the use of, a specified asset for a lease term. Under the new guidance, lessor accounting is largely unchanged. The amendments are effective for public companies for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The Company has identified certain operating leases in scope of this guidance to include office space and equipment leases (See Note 15 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report for current balances of leases in scope). The leases within scope of this guidance will increase the Company's right-of-use assets and lease liabilities recorded on its statement of financial position, however the Company estimates leases within scope of the guidance to represent less than 1% of its total assets as of March 31, 2018. The Company estimates that the adoption of this guidance will not have a significant impact on its financial position, results of operations, or disclosures.

Recent accounting guidance not discussed above is not applicable, did not have, or is not expected to have a material impact to the Company's business. 

For additional information on new accounting pronouncements and recent accounting guidance and their impact, if any, on the Company's financial position or results of operations, see Note 1 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

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BUSINESS SEGMENT INFORMATION

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

BUSINESS SEGMENT INFORMATION

BUSINESS SEGMENT INFORMATION

The Company consists of two reportable insurance business segments: Aflac Japan and Aflac U.S., both of which sell supplemental health and life insurance. Operating business segments that are not individually reportable and business activities, including reinsurance retrocession activities, not included in Aflac Japan or Aflac U.S. are included in the "Corporate and other" category.

The Company does not allocate corporate overhead expenses to business segments. Consistent with U.S. GAAP accounting guidance for segment reporting, the Company evaluates and manages its business segments using a financial performance measure called pretax adjusted earnings. Adjusted earnings are adjusted revenues less benefits and adjusted expenses. The adjustments to both revenues and expenses account for certain items that cannot be predicted or that are outside management’s control. Adjusted revenues are U.S. GAAP total revenues excluding realized investment gains and losses, except for amortized hedge costs related to foreign currency denominated investments. Adjusted expenses are U.S. GAAP total acquisition and operating expenses including the impact of interest cash flows from derivatives associated with notes payable but excluding any nonrecurring or other items not associated with the normal course of the Company’s insurance operations and that do not reflect Aflac’s underlying business performance. The Company excludes income taxes related to operations to arrive at pretax adjusted earnings. Information regarding operations by segment follows:

	Three Months Ended March 31,
(In millions)	2018			2017
Revenues:
Aflac Japan:
Net earned premiums	$	3,263		$	3,194
Net investment income, less amortized hedge costs (1)	588			557
Other income	12			10
Total Aflac Japan	3,863			3,761
Aflac U.S.:
Net earned premiums	1,427			1,390
Net investment income	175			178
Other income	2			1
Total Aflac U.S.	1,604			1,569
Corporate and other (2)	79			67
Total adjusted revenues	5,546			5,397
Realized investment gains (losses) (1),(2)	(82		)	(88		)
Total revenues	$	5,464		$	5,309

⁽¹⁾ Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $52 for the three-month periods ended March 31, 2018, and 2017, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from net investment income when analyzing segment operations.

⁽²⁾ Amortized hedge costs in Aflac Japan were offset by derivatives entered into as part of corporate activities and resulted in a benefit of $2 for the three-month period ended March 31, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in net investment income when analyzing operations.

	Three Months Ended March 31,
(In millions)	2018			2017
Pretax earnings:
Aflac Japan (1)	$	818		$	769
Aflac U.S.	337			310
Corporate and other (2)	(46		)	(52		)
Pretax adjusted earnings	1,109			1,027
Realized investment gains (losses) (1),(2),(3)	(98		)	(109		)
Other income (loss)	(29		)	(20		)
Total earnings before income taxes	$	982		$	898
Income taxes applicable to pretax adjusted earnings	$	289		$	351
Effect of foreign currency translation on after-tax adjusted earnings	21			5

⁽¹⁾ Amortizedhedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $52 for the three-month periods ended March 31, 2018, and 2017, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from pretax adjusted earnings when analyzing segment operations.

⁽²⁾ Amortized hedge costs in Aflac Japan were offset by derivatives entered into as part of corporate activities and resulted in a benefit of $2 for the three-month period ended March 31, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in pretax adjusted earnings when analyzing operations.

⁽³⁾ Excluding a gain of $17 and $21 for the three-month periods ended March 31, 2018, and 2017, respectively, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable which is included in adjusted earnings when analyzing segment operations

Assets were as follows:

(In millions)	March 31, 2018			December 31, 2017
Assets:
Aflac Japan		$	125,174		$	114,402
Aflac U.S.		19,706			19,893
Corporate and other		2,476			2,922
Total assets		$	147,356		$	137,217

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INVESTMENTS

3 Months Ended

Mar. 31, 2018

Investments [Abstract]

INVESTMENTS

INVESTMENTS

Investment Holdings

The amortized cost for the Company's investments in debt securities, the cost for equity securities and the fair values of these investments are shown in the following tables.

	March 31, 2018
(In millions)	Cost or Amortized Cost				Gross Unrealized Gains			Gross Unrealized Losses			Fair   Value
Securities available for sale, carried at fair value through other comprehensive income:
Fixed maturity securities: (1)
Yen-denominated:
Japan government and agencies		$	32,961			$	3,811		$	192		$	36,580
Municipalities		350				33			11			372
Mortgage- and asset-backed securities		254				30			0			284
Public utilities		1,739				325			4			2,060
Sovereign and supranational		1,348				212			27			1,533
Banks/financial institutions		5,157				799			76			5,880
Other corporate		4,345				754			8			5,091
Total yen-denominated		46,154				5,964			318			51,800
U.S. dollar-denominated:
U.S. government and agencies		148				9			1			156
Municipalities		866				135			0			1,001
Mortgage- and asset-backed securities		165				7			1			171
Public utilities		5,223				631			107			5,747
Sovereign and supranational		274				59			0			333
Banks/financial institutions		2,841				457			34			3,264
Other corporate		25,936				1,736			1,111			26,561
Total U.S. dollar-denominated		35,453				3,034			1,254			37,233
Total securities available for sale		$	81,607	(1)		$	8,998		$	1,572		$	89,033	(1)

⁽¹⁾ Includes perpetual securities ($1,506 at amortized cost and $1,774 at fair value)

	March 31, 2018
(In millions)	Cost or Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair   Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Yen-denominated:
Japan government and agencies		$	22,686		$	5,631		$	0		$	28,317
Municipalities		379			114			0			493
Mortgage- and asset-backed securities		26			2			0			28
Public utilities		3,508			383			0			3,891
Sovereign and supranational		1,620			299			0			1,919
Banks/financial institutions		2,300			190			13			2,477
Other corporate		2,858			485			0			3,343
Total yen-denominated		33,377			7,104			13			40,468
Total securities held to maturity		$	33,377		$	7,104		$	13		$	40,468

	March 31, 2018
(In millions)		Fair   Value
Equity securities, carried at fair value through   net earnings:
Equity securities: (1)
Yen-denominated			$	711
U.S. dollar-denominated			397
Total equity securities			$	1,108	(1)

⁽¹⁾ Includes perpetual securities ($71 at fair value)

	December 31, 2017
(In millions)	Cost or Amortized Cost				Gross Unrealized Gains			Gross Unrealized Losses			Fair   Value
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Yen-denominated:
Japan government and agencies		$	27,980			$	3,363		$	271		$	31,072
Municipalities		314				28			12			330
Mortgage- and asset-backed securities		242				29			0			271
Public utilities		1,635				352			6			1,981
Sovereign and supranational		1,380				190			1			1,569
Banks/financial institutions		4,742				811			53			5,500
Other corporate		4,085				809			7			4,887
Total yen-denominated		40,378				5,582			350			45,610
U.S dollar-denominated:
U.S. government and agencies		146				13			1			158
Municipalities		872				168			0			1,040
Mortgage- and asset-backed securities		161				12			0			173
Public utilities		5,116				884			27			5,973
Sovereign and supranational		267				73			0			340
Banks/financial institutions		2,808				633			8			3,433
Other corporate		25,384				2,620			418			27,586
Total U.S. dollar-denominated		34,754				4,403			454			38,703
Total securities available for sale		$	75,132	(1)		$	9,985		$	804		$	84,313	(1)

⁽¹⁾ Includes perpetual securities ($1,462 at amortized cost and $1,789 at fair value)

	December 31, 2017
(In millions)	Cost or Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Yen-denominated:
Japan government and agencies		$	21,331		$	5,160		$	0		$	26,491
Municipalities		357			105			0			462
Mortgage- and asset-backed securities		26			1			0			27
Public utilities		3,300			398			0			3,698
Sovereign and supranational		1,523			312			0			1,835
Banks/financial institutions		2,206			190			9			2,387
Other corporate		2,687			485			0			3,172
Total yen-denominated		31,430			6,651			9			38,072
Total securities held to maturity		$	31,430		$	6,651		$	9		$	38,072

	December 31, 2017
(In millions)		Fair Value
Equity securities, carried at fair value:
Equity securities:
Yen-denominated			$	695
U.S. dollar-denominated			328
Total equity securities			$	1,023

The methods of determining the fair values of the Company's investments in fixed maturity securities and equity securities are described in Note 5.

During the first quarter of 2018 and 2017, respectively, the Company did not reclassify any investments from the held-to-maturity category to the available-for-sale category.

Contractual and Economic Maturities

The contractual and economic maturities of the Company's investments in fixed maturity securities at March 31, 2018, were as follows:

(In millions)	Amortized Cost			Fair Value
Available for sale: (1)
Due in one year or less		$	485		$	502
Due after one year through five years		9,685			9,551
Due after five years through 10 years		10,637			11,143
Due after 10 years		60,381			67,382
Mortgage- and asset-backed securities		419			455
Total fixed maturity securities available for sale		$	81,607		$	89,033
Held to maturity:
Due in one year or less		$	1,036		$	1,049
Due after one year through five years		508			527
Due after five years through 10 years		1,597			1,754
Due after 10 years		30,210			37,110
Mortgage- and asset-backed securities		26			28
Total fixed maturity securities held to maturity		$	33,377		$	40,468

⁽¹⁾ Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)

Expected maturities may differ from contractual maturities because some issuers have the right to call or prepay obligations with or without call or prepayment penalties.

Investment Concentrations

The Company's process for investing in credit-related investments begins with an independent approach to underwriting each issuer's fundamental credit quality. The Company evaluates independently those factors that it believes could influence an issuer's ability to make payments under the contractual terms of the Company's instruments. This includes a thorough analysis of a variety of items including the issuer's country of domicile (including political, legal, and financial considerations); the industry in which the issuer competes (with an analysis of industry structure, end-market dynamics, and regulation); company specific issues (such as management, assets, earnings, cash generation, and capital needs); and contractual provisions of the instrument (such as financial covenants and position in the capital structure). The Company further evaluates the investment considering broad business and portfolio management objectives, including asset/liability needs, portfolio diversification, and expected income.

Investment exposures that individually exceeded 10% of shareholders' equity were as follows:

	March 31, 2018			December 31, 2017
(In millions)	Credit Rating	Amortized Cost	Fair Value	Credit Rating	Amortized Cost	Fair Value
Japan National Government(1)	A	$54,465	$63,576	A	$48,399	$56,532

⁽¹⁾Japan Government Bonds (JGBs) or JGB-backed securities

Realized Investment Gains and Losses

Information regarding pretax realized gains and losses from investments is as follows:

	Three Months Ended March 31,
(In millions)	2018				2017
Realized investment gains (losses):
Fixed maturity securities: (1)
Available for sale:
Gross gains from sales	$	9			$	12
Gross losses from sales	(4		)		(15		)
Net gains (losses) from redemptions	(2		)		(28		)
Other-than-temporary impairment losses	0				(4		)
Total fixed maturity securities	3				(35		)
Equity securities (2)	(46		)	(1)	19			(3)
Loan loss reserves	(7		)		(1		)
Derivatives and other:
Derivative gains (losses)	144				(52		)
Foreign currency gains (losses)	(228		)		(71		)
Total derivatives and other	(84		)		(123		)
Total realized investment gains (losses)	$	(134	)		$	(140	)

⁽¹⁾ Includes perpetual securities

⁽²⁾ See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

⁽³⁾ Includes $6 of impairments

The unrealized holding losses, net of gains, recorded as a component of realized investment gains and losses for the three-month period ended March 31, 2018, that relates to equity securities still held at the March 31, 2018, reporting date was $43 million.

Unrealized Investment Gains and Losses

Effect on Shareholders’ Equity

The net effect on shareholders’ equity of unrealized gains and losses from investment securities was as follows:

(In millions)	March 31, 2018				December 31, 2017
Unrealized gains (losses) on securities available for sale		$	7,426			$	9,358
Deferred income taxes		(2,220		)		(3,394		)
Shareholders’ equity, unrealized gains (losses) on investment securities		$	5,206			$	5,964

See Note 1 for discussion of the accounting treatment of tax on amounts recorded in accumulated other comprehensive income pursuant to the Tax Act and for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

Gross Unrealized Loss Aging

The following tables show the fair values and gross unrealized losses of the Company's available-for-sale and held-to-maturity investments that were in an unrealized loss position, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.

	March 31, 2018
	Total						Less than 12 months						12 months or longer
(In millions)	Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value			Unrealized Losses
Fixed maturity securities: (1)
U.S. government and agencies:
U.S. dollar-denominated		$	79		$	1		$	71		$	1		$	8		$	0
Japan government and agencies:
Yen-denominated		4,054			192			128			0			3,926			192
Municipalities:
Yen-denominated		128			11			0			0			128			11
Mortgage- and asset- backed securities:
U.S. dollar-denominated		91			1			71			1			20			0
Public utilities:
U.S. dollar-denominated		1,649			107			1,095			52			554			55
Yen-denominated		90			4			0			0			90			4
Sovereign and supranational:
Yen-denominated		302			27			302			27			0			0
Banks/financial institutions:
U.S. dollar-denominated		685			34			596			28			89			6
Yen-denominated		1,467			89			645			14			822			75
Other corporate:
U.S. dollar-denominated		13,730			1,111			8,903			420			4,827			691
Yen-denominated		302			8			276			6			26			2
Total		$	22,577		$	1,585		$	12,087		$	549		$	10,490		$	1,036

⁽¹⁾ Includes perpetual securities

	December 31, 2017
	Total						Less than 12 months						12 months or longer
(In millions)	Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value			Unrealized Losses
Fixed maturity securities: (1)
U.S. government and agencies:
U.S. dollar-denominated		$	74		$	1		$	74		$	1		$	0		$	0
Japan government and agencies:
Yen-denominated		5,255			271			1,264			9			3,991			262
Municipalities:
Yen-denominated		129			12			10			0			119			12
Public utilities:
U.S. dollar-denominated		785			27			221			3			564			24
Yen-denominated		83			6			0			0			83			6
Sovereign and supranational:
Yen-denominated		309			1			309			1			0			0
Banks/financial institutions:
U.S. dollar-denominated		362			8			316			5			46			3
Yen-denominated		1,507			62			394			4			1,113			58
Other corporate:
U.S. dollar-denominated		7,741			418			2,839			50			4,902			368
Yen-denominated		440			7			349			4			91			3
Total		$	16,685		$	813		$	5,776		$	77		$	10,909		$	736

⁽¹⁾ Includes perpetual securities

Analysis of Securities in Unrealized Loss Positions

The unrealized losses on the Company's fixed maturity securities investments have been primarily related to general market changes in interest rates, foreign exchange rates, and/or the levels of credit spreads rather than specific concerns with the issuer's ability to pay interest and repay principal.

For any significant declines in fair value of its fixed maturity securities, the Company performs a more focused review of the related issuers' credit profile. For corporate issuers, the Company evaluates their assets, business profile including industry dynamics and competitive positioning, financial statements and other available financial data. For non-corporate issuers, the Company analyzes all sources of credit support, including issuer-specific factors. The Company utilizes information available in the public domain and, for certain private placement issuers, from consultations with the issuers directly. The Company also considers ratings from Nationally Recognized Statistical Rating Organizations (NRSROs), as well as the specific characteristics of the security it owns including seniority in the issuer's capital structure, covenant predictions, or other relevant features. From these reviews, the Company evaluates the issuers' continued ability to service the Company's investment through payment of interest and principal.

Assuming no credit-related factors develop, unrealized gains and losses on fixed maturity securities are expected to diminish as investments near maturity. Based on its credit analysis, the Company believes that the issuers of its fixed maturity investments in the sectors shown in the table above have the ability to service their obligations to the Company.

Other Investments

The table below reflects the composition of the carrying value for other investments as of the periods presented.

(In millions)	March 31, 2018			December 31, 2017
Other investments:
Transitional real estate loans		$	2,719		$	1,235
Commercial mortgage loans		917			908
Middle market loans		957			859
Policy loans		227			210
Short-term investments		0			57
Other		253			133
Total other investments		$	5,073		$	3,402

Loans and Loan Receivables

The Company classifies its transitional real estate loans (TREs), commercial mortgage loans (CMLs) and middle market loans (MMLs) as held-for-investment and includes them in the other investments line on the consolidated balance sheets. The Company carries them on the balance sheet at amortized cost less an estimated allowance for loan losses. The Company's allowance for loan losses is established using both general and specific allowances. The general allowance is used for loans grouped by similar risk characteristics where a loan-specific or market-specific risk has not been identified, but for which the Company estimates probable incurred losses. The specific allowance is used on an individual loan basis when it is probable that a loss has been incurred. As of March 31, 2018, and December 31, 2017, the Company's allowance for loan losses was $18 million and $11 million, respectively. As of March 31, 2018, and December 31, 2017, the Company had no loans that were past due in regards to principal and/or interest payments. Additionally, the Company held no loans that were on nonaccrual status or considered impaired as of March 31, 2018, and December 31, 2017. The Company had no troubled debt restructurings during the three months ended March 31, 2018 and 2017.

Transitional Real Estate Loans

Transitional real estate loans are commercial mortgage loans that are typically relatively short-term floating rate instruments secured by a first lien on the property. These loans provide funding for properties undergoing a change in their physical characteristics and/or economic profile. As of March 31, 2018, the Company had $436 million in outstanding commitments to fund transitional real estate loans. These commitments are contingent on the final underwriting and due diligence to be performed.

Commercial Mortgage Loans

As of March 31, 2018, the Company had $54 million in outstanding commitments to fund commercial mortgage loans. These commitments are contingent on the final underwriting and due diligence to be performed.

Middle Market Loans

Middle market loans are generally considered to be below investment grade. The carrying value for middle market loans included an unfunded amount of $76 million and $109 million, as of March 31, 2018, and December 31, 2017, respectively, that is reflected in other liabilities on the consolidated balance sheets.

As of March 31, 2018, the Company had commitments of approximately $985 million to fund potential future loan originations related to this investment program. These commitments are contingent upon the availability of middle market loans that meet the Company's underwriting criteria.

Other

Other investments primarily includes investments in limited partnerships. As of March 31, 2018, the Company had $763 million in outstanding commitments to fund alternative investments in limited partnerships.

Variable Interest Entities (VIEs)

As a condition of its involvement or investment in a VIE, the Company enters into certain protective rights and covenants that preclude changes in the structure of the VIE that would alter the creditworthiness of the Company's investment or its beneficial interest in the VIE.

For those VIEs other than certain unit trust structures, the Company's involvement is passive in nature. The Company has not, nor has it been, required to purchase any securities issued in the future by these VIEs.

The Company's ownership interest in VIEs is limited to holding the obligations issued by them. The Company has no direct or contingent obligations to fund the limited activities of these VIEs, nor does it have any direct or indirect financial guarantees related to the limited activities of these VIEs. The Company has not provided any assistance or any other type of financing support to any of the VIEs it invests in, nor does it have any intention to do so in the future. For those VIEs in which the Company holds debt obligations, the weighted-average lives of the Company's notes are very similar to the underlying collateral held by these VIEs where applicable.

The Company's risk of loss related to its interests in any of its VIEs is limited to the carrying value of the related investments held in the VIE.

VIEs - Consolidated

The following table presents the cost or amortized cost, fair value and balance sheet caption in which the assets and liabilities of consolidated VIEs are reported.

Investments in Consolidated Variable Interest Entities

	March 31, 2018						December 31, 2017
(In millions)	Cost or Amortized Cost			Fair Value			Cost or Amortized Cost			Fair Value
Assets:
Fixed maturity securities, available for sale (1)		$	4,695		$	5,431		$	4,538		$	5,509
Equity securities		760			760			606			753
Other investments (2)		3,994			3,974			2,341			2,328
Other assets (3)		241			241			151			151
Total assets of consolidated VIEs		$	9,690		$	10,406		$	7,636		$	8,741
Liabilities:
Other liabilities (3)		$	86		$	86		$	128		$	128
Total liabilities of consolidated VIEs		$	86		$	86		$	128		$	128

⁽¹⁾ Includes perpetual securities

⁽²⁾ Consists of TREs, CMLs, MMLs, and alternative investments in limited partnerships

⁽³⁾ Consists entirely of derivatives

The Company is substantively the only investor in the consolidated VIEs listed in the table above. As the sole investor in these VIEs, the Company has the power to direct the activities of a variable interest entity that most significantly impact the entity's economic performance and is therefore considered to be the primary beneficiary of the VIEs that it consolidates. The Company also participates in substantially all of the variability created by these VIEs. The activities of these VIEs are limited to holding invested assets and foreign currency, and/or credit default swaps (CDS), as appropriate, and utilizing the cash flows from these securities to service its investment. Neither the Company nor any of its creditors are able to obtain the underlying collateral of the VIEs unless there is an event of default or other specified event. For those VIEs that contain a swap, the Company is not a direct counterparty to the swap contracts and has no control over them. The Company's loss exposure to these VIEs is limited to its original investment. The Company's consolidated VIEs do not rely on outside or ongoing sources of funding to support their activities beyond the underlying collateral and swap contracts, if applicable. With the exception of its investment in unit trust structures, the underlying collateral assets and funding of the Company's consolidated VIEs are generally static in nature and the underlying collateral and the reference corporate entities covered by any CDS contracts were all investment grade at the time of issuance.

Investments in Unit Trust Structures

The Company also utilizes unit trust structures in its Aflac Japan segment to invest in various asset classes. As the sole investor of these VIEs, the Company is required to consolidate these trusts under U.S. GAAP.

VIEs-Not Consolidated

The table below reflects the amortized cost, fair value and balance sheet caption in which the Company's investment in VIEs not consolidated are reported.

Investments in Variable Interest Entities Not Consolidated

	March 31, 2018						December 31, 2017
(In millions)	Amortized Cost			Fair Value			Amortized Cost			Fair Value
Assets:
Fixed maturity securities, available for sale (1)		$	5,194		$	5,749		$	5,004		$	5,724
Fixed maturity securities, held to maturity		2,711			3,077			2,549			2,929
Other investments		110			108			55			55
Total investments in VIEs not consolidated		$	8,015		$	8,934		$	7,608		$	8,708

⁽¹⁾ Includes perpetual securities

The Company holds alternative investments in limited partnerships that have been determined to be VIEs. These partnerships invest in private equity and structured investments. The Company’s maximum exposure to loss on these investments is limited to the amount of its investment. The Company is not the primary beneficiary of these VIEs and is therefore not required to consolidate them. The Company classifies these investments as Other investments in the consolidated balance sheets.

Certain investments in VIEs that the Company is not required to consolidate are investments that are in the form of debt obligations from the VIEs that are irrevocably and unconditionally guaranteed by their corporate parents or sponsors. These VIEs are the primary financing vehicles used by their corporate sponsors to raise financing in the capital markets. The variable interests created by these VIEs are principally or solely a result of the debt instruments issued by them. The Company does not have the power to direct the activities that most significantly impact the entity's economic performance, nor does it have the obligation to absorb losses of the entity or the right to receive benefits from the entity. As such, the Company is not the primary beneficiary of these VIEs and is therefore not required to consolidate them.

Securities Lending and Pledged Securities

The Company lends fixed maturity and public equity securities to financial institutions in short-term security-lending transactions. These short-term security-lending arrangements increase investment income with minimal risk. The Company's security lending policy requires that the fair value of the securities and/or unrestricted cash received as collateral be 102% or more of the fair value of the loaned securities. These securities continue to be carried as investment assets on the Company's balance sheet during the terms of the loans and are not reported as sales. The Company receives cash or other securities as collateral for such loans. For loans involving unrestricted cash or securities as collateral, the collateral is reported as an asset with a corresponding liability for the return of the collateral.

Details of the Company's securities lending activities were as follows:

Securities Lending Transactions Accounted for as Secured Borrowings
March 31, 2018
Remaining Contractual Maturity of the Agreements
(In millions)	Overnight and Continuous(1)		Up to 30 days		Total
Securities lending transactions:
Fixed maturity securities:
Japan government and agencies	$	0	$	4,894	$	4,894
Public utilities	30		0		30
Banks/financial institutions	52		0		52
Other corporate	384		0		384
Equity securities	8		0		8
Total borrowings	$	474	$	4,894	$	5,368
Gross amount of recognized liabilities for securities lending transactions					$	5,368
Amounts related to agreements not included in offsetting disclosure in Note 4					$	0

⁽¹⁾ These securities are pledged as collateral under the Company's U.S. securities lending program and can be called at its discretion; therefore, they are classified as Overnight and Continuous.

Securities Lending Transactions Accounted for as Secured Borrowings
December 31, 2017
Remaining Contractual Maturity of the Agreements
(In millions)	Overnight and Continuous(1)		Up to 30 days		Total
Securities lending transactions:
Fixed maturity securities:
Japan government and agencies	$	0	$	49	$	49
Public utilities	73		0		73
Banks/financial institutions	54		0		54
Other corporate	415		0		415
Equity securities	15		0		15
Total borrowings	$	557	$	49	$	606
Gross amount of recognized liabilities for securities lending transactions					$	606
Amounts related to agreements not included in offsetting disclosure in Note 4					$	0

⁽¹⁾ These securities are pledged as collateral under the Company's U.S. securities lending program and can be called at its discretion; therefore, they are classified as Overnight and Continuous.

The Company did not have any repurchase agreements or repurchase-to-maturity transactions outstanding as of March 31, 2018, and December 31, 2017, respectively.

Certain fixed maturity securities can be pledged as collateral as part of derivative transactions, or pledged to support state deposit requirements or certain investment programs. For additional information regarding pledged securities related to derivative transactions, see Note 4.

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DERIVATIVE INSTRUMENTS

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS

The Company's freestanding derivative financial instruments have historically consisted of: (1) foreign currency forwards and options used in hedging foreign exchange risk on U.S. dollar-denominated investments in Aflac Japan's portfolio; (2) foreign currency forwards and options used to hedge foreign exchange risk from the Company's net investment in Aflac Japan and economically hedge certain portions of forecasted cash flows denominated in yen; (3) swaps associated with the Company's notes payable, consisting of cross-currency interest rate swaps, also referred to as foreign currency swaps, associated with certain senior notes and its subordinated debentures; and (4) foreign currency swaps and credit default swaps that are associated with investments in special-purpose entities, including VIEs where the Company is the primary beneficiary. The Company does not use derivative financial instruments for trading purposes, nor does it engage in leveraged derivative transactions. Some of the Company's derivatives are designated as cash flow hedges, fair value hedges or net investment hedges; however, other derivatives do not qualify for hedge accounting or the Company elects not to designate them as an accounting hedge. The Company utilizes a net investment hedge to mitigate foreign exchange exposure resulting from its net investment in Aflac Japan. In addition to designating derivatives as hedging instruments, the Company has designated the majority of the Parent Company's yen-denominated liabilities (notes payable and loans) as nonderivative hedging instruments for this net investment hedge.

Derivative Types

Foreign currency forwards and options are executed for the Aflac Japan segment in order to hedge the currency risk on the carrying value of certain U.S. dollar-denominated investments. The average maturity of these forwards and options can change depending on factors such as market conditions and types of investments being held. In situations where the maturity of the forwards and options are shorter than the underlying investment being hedged, the Company may enter into new forwards and options near maturity of the existing derivative in order to continue hedging the underlying investment. In forward transactions, Aflac Japan agrees with another party to buy a fixed amount of yen and sell a corresponding amount of U.S. dollars at a specified future date. Aflac Japan also executes foreign currency option transactions in a collar strategy, where Aflac Japan agrees with another party to simultaneously purchase a fixed amount of U.S. dollar put options and sell U.S. dollar call options. The combination of these two actions results in no net premium being paid (i.e. a costless or zero-cost collar). The foreign currency forwards and options are used in fair value hedging relationships to mitigate the foreign exchange risk associated with U.S. dollar-denominated investments supporting yen-denominated liabilities.

Foreign currency forwards and options are also used to hedge the currency risk associated with the net investment in Aflac Japan. In these forward transactions, Aflac agrees with another party to buy a fixed amount of U.S. dollars and sell a corresponding amount of yen at a specified price at a specified future date. In the option transactions, the Company uses a combination of foreign currency options to protect expected future cash flows by simultaneously purchasing yen put options (options that protect against a weakening yen) and selling yen call options (options that limit participation in a strengthening yen). The combination of these two actions results in no net premium being paid (i.e. a costless or zero-cost collar).

The Company enters into foreign currency swaps pursuant to which it exchanges an initial principal amount in one currency for an initial principal amount of another currency, with an agreement to re-exchange the currencies at a future date at an agreed upon exchange rate. There may also be periodic exchanges of payments at specified intervals based on the agreed upon rates and notional amounts. Foreign currency swaps are used primarily in the consolidated VIEs in the Company's Aflac Japan portfolio to convert foreign-denominated cash flows to yen, the functional currency of Aflac Japan, in order to minimize cash flow fluctuations. The Company also uses foreign currency swaps to economically convert certain of its U.S. dollar-denominated senior note and subordinated debenture principal and interest obligations into yen-denominated obligations.

The only CDS that the Company currently holds relates to components of an investment in a VIE and is used to assume credit risk related to an individual security. This CDS contract entitles the consolidated VIE to receive periodic fees in exchange for an obligation to compensate the derivative counterparties should the referenced security issuer experience a credit event, as defined in the contract.

Periodically, the Company may enter into other derivative transactions depending on general economic conditions.

Derivative Balance Sheet Classification

The tables below summarize the balance sheet classification of the Company's derivative fair value amounts, as well as the gross asset and liability fair value amounts. The fair value amounts presented do not include income accruals. The notional amount of derivative contracts represents the basis upon which pay or receive amounts are calculated and are not reflective of exposure or credit risk.

		March 31, 2018										December 31, 2017
(In millions)				Asset Derivatives			Liability Derivatives							Asset Derivatives			Liability Derivatives
Hedge Designation/ Derivative Type	Notional Amount			Fair Value			Fair Value				Notional Amount			Fair Value			Fair Value
Cash flow hedges:
Foreign currency swaps		$	75		$	1		$	(2	)		$	75		$	0		$	(8	)
Total cash flow hedges		75			1			(2		)		75			0			(8		)
Fair value hedges:
Foreign currency forwards		5,550			244			(5		)		7,640			2			(221		)
Foreign currency options		9,120			0			(3		)		7,670			0			(2		)
Total fair value hedges		14,670			244			(8		)		15,310			2			(223		)
Net investment hedge:
Foreign currency forwards		0			0			0				5			0			0
Foreign currency options		0			0			0				434			12			(1		)
Total net investment hedge		0			0			0				439			12			(1		)
Non-qualifying strategies:
Foreign currency swaps		5,426			369			(263		)		5,386			296			(189		)
Foreign currency forwards		6,656			182			(80		)		3,683			20			(53		)
Foreign currency options		299			0			0				770			0			0
Credit default swaps		94			1			0				88			1			0
Total non-qualifying strategies		12,475			552			(343		)		9,927			317			(242		)
Total derivatives		$	27,220		$	797		$	(353	)		$	25,751		$	331		$	(474	)
Balance Sheet Location
Other assets		$	18,248		$	797		$	0			$	10,948		$	331		$	0
Other liabilities		8,972			0			(353		)		14,803			0			(474		)
Total derivatives		$	27,220		$	797		$	(353	)		$	25,751		$	331		$	(474	)

Cash Flow Hedges

Certain of the Company's consolidated VIEs have foreign currency swaps that qualify for hedge accounting treatment. For those that have qualified, the Company has designated the derivative as a hedge of the variability in cash flows of a forecasted transaction or of amounts to be received or paid related to a recognized asset (“cash flow” hedge). The maximum length of time for which these cash flows are hedged is nine years. The remaining derivatives in the Company's consolidated VIEs that have not qualified for hedge accounting are included in “non-qualifying strategies.”

Fair Value Hedges

The Company designates and accounts for certain foreign currency forwards and options as fair value hedges when they meet the requirements for hedge accounting. These foreign currency forwards and options hedge the foreign currency exposure of certain U.S. dollar-denominated investments. The Company recognizes gains and losses on these derivatives and the related hedged items in current earnings within derivative and other gains (losses). The change in the fair value of the foreign currency forwards related to the changes in the difference between the spot rate and the forward price is excluded from the assessment of hedge effectiveness. The change in fair value of the foreign currency option related to the time value of the option is excluded from the assessment of hedge effectiveness.

The following table presents the gains and losses on derivatives and the related hedged items in fair value hedges.

Fair Value Hedging Relationships

(In millions)		Hedging Derivatives								Hedged Items
Hedging Derivatives	Hedged Items	Total Gains (Losses)			Gains (Losses) Excluded from Effectiveness Testing			Gains (Losses) Included in Effectiveness Testing		Gains (Losses)			Ineffectiveness Recognized for Fair Value Hedge
Three Months Ended March 31, 2018:
Foreign currency forwards	Fixed maturity securities	$	414		$	(39	)	$	453	$	(464	)	$	(11	)
Foreign currency options	Fixed maturity securities	(1		)	(1		)	0		0			0
Three Months Ended March 31, 2017:
Foreign currency forwards	Fixed maturity and equity securities	$	341		$	(48	)	$	389	$	(372	)	$	17
Foreign currency options	Fixed maturity securities	24			13			11		(10		)	1

Net Investment Hedge

The Company's investment in Aflac Japan is affected by changes in the yen/dollar exchange rate. To mitigate this exposure, the Parent Company's yen-denominated liabilities (see Note 8) have been designated as non-derivative hedges and foreign currency forwards and options have been designated as derivative hedges of the foreign currency exposure of the Company's net investment in Aflac Japan.

The Company's net investment hedge was effective during the three-month periods ended March 31, 2018 and 2017, respectively.

Non-qualifying Strategies

For the Company's derivative instruments in consolidated VIEs that do not qualify for hedge accounting treatment, all changes in their fair value are reported in current period earnings within derivative and other gains (losses). The amount of gain or loss recognized in earnings for the Company's VIEs is attributable to the derivatives in those investment structures. While the change in value of the swaps is recorded through current period earnings, the change in value of the available-for-sale fixed maturity securities associated with these swaps is recorded through other comprehensive income.

As of March 31, 2018, the Parent Company had cross-currency interest rate swap agreements related to its $550 million senior notes due March 2020, $350 million senior notes due February 2022, $700 million senior notes due June 2023, $750 million senior notes due November 2024 and $450 million senior notes due March 2025. Changes in the values of these swaps are recorded through current period earnings. For additional information regarding these swaps, see Note 8 in this report and Note 9 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

The Company uses foreign exchange forwards and options to mitigate the currency risk of some of its U.S. dollar-denominated loan receivables held within the Aflac Japan segment. The Company has not elected to apply hedge accounting for these loan receivables due to the change in fair value of the foreign exchange forwards and the foreign currency remeasurement of the loan receivables being recorded through current period earnings, and generally offsetting each other within realized investment gains (losses).

In order to economically mitigate currency risk of future yen dividends from Aflac Japan while lowering consolidated hedge costs associated with Aflac Japan's U.S. dollar investment hedging, starting in the first quarter of 2018, the Parent Company began entering into offsetting hedge positions using foreign exchange forwards and options. This activity is reported in the Corporate and other segment.

Impact of Derivatives and Hedging Instruments

The following table summarizes the impact to realized investment gains (losses) and other comprehensive income (loss) from all derivatives and hedging instruments.

	Three Months Ended March 31,
	2018								2017
(In millions)	Realized Investment Gains (Losses)				Other Comprehensive Income (Loss)(1)				Realized Investment Gains (Losses)				Other Comprehensive Income (Loss)(1)
Qualifying hedges:
Cash flow hedges:
Foreign currency swaps		$	1			$	6			$	0			$	2
Total cash flow hedges		1				6				0				2
Fair value hedges:
Foreign currency forwards(2)		(50		)		0				(31		)		0
Foreign currency options(2)		(1		)		0				14				0
Total fair value hedges		(51		)		0				(17		)		0
Net investment hedge:
Non-derivative hedging instruments		0				(84		)		0				(17		)
Foreign currency forwards		0				0				0				(9		)
Foreign currency options		0				(8		)		0				(23		)
Total net investment hedge		0				(92		)		0				(49		)
Non-qualifying strategies:
Foreign currency swaps		14				0				(8		)		0
Foreign currency forwards		179				0				(27		)		0
Foreign currency options		1				0				0				0
Total non-qualifying strategies		194				0				(35		)		0
Total		$	144			$	(86	)		$	(52	)		$	(47	)

⁽¹⁾ Cash flow hedge items are recorded as unrealized gains (losses) on derivatives and net investment hedge items are recorded in the unrealized foreign currency translation gains (losses) line in the consolidated statement of comprehensive income (loss).

⁽²⁾ Impact shown net of effect of hedged items (see Fair Value Hedges section of this Note 4 for further detail)

The Company reclassified an immaterial amount related to its cash flow hedges from accumulated other comprehensive income (loss) into earnings for the three-month periods ended March 31, 2018 and 2017. There was no gain orloss reclassified from accumulated other comprehensive income (loss) into earnings related to the net investment hedge for the three-month periods ended March 31, 2018 and 2017. As of March 31, 2018, deferred gains and losses on derivative instruments recorded in accumulated other comprehensive income that are expected to be reclassified to earnings during the next twelve months were immaterial.

Credit Risk Assumed through Derivatives

For the foreign currency and credit default swaps associated with the Company's VIE investments for which it is the primary beneficiary, the Company bears the risk of loss due to counterparty default even though it is not a direct counterparty to those contracts.

The Company is a direct counterparty to the foreign currency swaps that it has entered into in connection with certain of its senior notes and subordinated debentures; foreign currency forwards; foreign currency options; and interest rate swaptions, and therefore the Company is exposed to credit risk in the event of nonperformance by the counterparties in those contracts. The risk of counterparty default for the Company's foreign currency swaps, certain foreign currency forwards, foreign currency options and interest rate swaptions is mitigated by collateral posting requirements that counterparties to those transactions must meet.

As of March 31, 2018, there were 15 counterparties to the Company's derivative agreements, with four comprising 59% of the aggregate notional amount. The counterparties to these derivatives are financial institutions with the following credit ratings:

	March 31, 2018										December 31, 2017
(In millions)	Notional Amount of Derivatives			Asset Derivatives Fair Value			Liability Derivatives Fair Value				Notional Amount of Derivatives			Asset Derivatives Fair Value			Liability Derivatives Fair Value
Counterparties' credit rating:
AA		$	4,685		$	123		$	(12	)		$	4,708		$	52		$	(37	)
A		22,081			673			(290		)		20,604			271			(370		)
BBB		454			1			(51		)		439			8			(67		)
Total		$	27,220		$	797		$	(353	)		$	25,751		$	331		$	(474	)

The Company engages in derivative transactions directly with unaffiliated third parties under International Swaps and Derivatives Association, Inc. (ISDA) agreements and other documentation. Most of the ISDA agreements also include Credit Support Annexes (CSAs) provisions, which generally provide for two-way collateral postings at the first dollar of exposure. The Company mitigates the risk that counterparties to transactions might be unable to fulfill their contractual obligations by monitoring counterparty credit exposure and collateral value while generally requiring that collateral be posted at the outset of the transaction. In addition, a significant portion of the derivative transactions have provisions that give the counterparty the right to terminate the transaction upon a downgrade of Aflac’s financial strength rating. The actual amount of payments that the Company could be required to make depends on market conditions, the fair value of outstanding affected transactions, and other factors prevailing at and after the time of the downgrade.

Collateral posted by the Company to third parties for derivative transactions can generally be repledged or resold by the counterparties. The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a net liability position by counterparty was approximately $154 million and $264 million as of March 31, 2018, and December 31, 2017, respectively. If the credit-risk-related contingent features underlying these agreements had been triggered on March 31, 2018, the Company estimates that it would be required to post a maximum of $5 million of additional collateral to these derivative counterparties. The Company is generally allowed to sell or repledge collateral obtained from its derivative counterparties, although it does not typically exercise such rights. (See the Offsetting tables below for collateral posted or received as of the reported balance sheet dates.)

Offsetting of Financial Instruments and Derivatives

Most of the Company's derivative instruments are subject to enforceable master netting arrangements that provide for the net settlement of all derivative contracts between the Parent Company or Aflac and its respective counterparty in the event of default or upon the occurrence of certain termination events. Collateral support agreements with the master netting arrangements generally provide that the Company will receive or pledge financial collateral at the first dollar of exposure.

The Company has securities lending agreements with unaffiliated financial institutions that post collateral to the Company in return for the use of its fixed maturity and public equity securities (see Note 3). When the Company has entered into securities lending agreements with the same counterparty, the agreements generally provide for net settlement in the event of default by the counterparty. This right of set-off allows the Company to keep and apply collateral received if the counterparty failed to return the securities borrowed from the Company as contractually agreed.

The tables below summarize the Company's derivatives and securities lending transactions, and as reflected in the tables, in accordance with U.S. GAAP, the Company's policy is to not offset these financial instruments in the Consolidated Balance Sheets.

Offsetting of Financial Assets and Derivative Asset

March 31, 2018
										Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Assets			Gross Amount Offset in Balance Sheet			Net Amount of Assets Presented  in Balance Sheet			Financial Instruments				Securities Collateral			Cash Collateral Received				Net Amount
Derivative   assets:
Derivative       assets subject to a       master netting       agreement or       offsetting       arrangement		$	556		$	0		$	556		$	(116	)	$	(343	)		$	(67	)		$	30
Derivative       assets not subject       to a master netting       agreement or       offsetting       arrangement		241						241														241
Total derivative       assets		797			0			797			(116		)	(343		)		(67		)		271
Securities lending    and similar    arrangements		5,249			0			5,249			0			0				(5,249		)		0
Total		$	6,046		$	0		$	6,046		$	(116	)	$	(343	)		$	(5,316	)		$	271

December 31, 2017
										Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Assets			Gross Amount Offset in Balance Sheet			Net Amount of Assets Presented  in Balance Sheet			Financial Instruments				Securities Collateral		Cash Collateral Received				Net Amount
Derivative   assets:
Derivative       assets subject to a       master netting       agreement or       offsetting       arrangement		$	180		$	0		$	180		$	(82	)	$	0		$	(98	)		$	0
Derivative       assets not subject       to a master netting       agreement or       offsetting       arrangement		151						151													151
Total derivative       assets		331			0			331			(82		)	0			(98		)		151
Securities lending    and similar    arrangements		592			0			592			0			0			(592		)		0
Total		$	923		$	0		$	923		$	(82	)	$	0		$	(690	)		$	151

Offsetting of Financial Liabilities and Derivative Liabilities

March 31, 2018
												Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Liabilities				Gross Amount Offset in Balance Sheet			Net Amount of Liabilities Presented  in Balance Sheet				Financial Instruments			Securities Collateral		Cash Collateral Pledged			Net Amount
Derivative   liabilities:
Derivative       liabilities subject       to a master netting       agreement or       offsetting       arrangement		$	(267	)		$	0		$	(267	)		$	116	$	36		$	113		$	(2	)
Derivative       liabilities not       subject to a       master netting       agreement or       offsetting       arrangement		(86		)					(86		)										(86		)
Total derivative       liabilities		(353		)		0			(353		)		116		36			113			(88		)
Securities lending    and similar    arrangements		(5,368		)		0			(5,368		)		5,249		0			0			(119		)
Total		$	(5,721	)		$	0		$	(5,721	)		$	5,365	$	36		$	113		$	(207	)

December 31, 2017
												Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Liabilities				Gross Amount Offset in Balance Sheet			Net Amount of Liabilities Presented  in Balance Sheet				Financial Instruments			Securities Collateral		Cash Collateral Pledged			Net Amount
Derivative   liabilities:
Derivative       liabilities subject       to a master netting       agreement or       offsetting       arrangement		$	(346	)		$	0		$	(346	)		$	82	$	245		$	10		$	(9	)
Derivative       liabilities not       subject to a       master netting       agreement or       offsetting       arrangement		(128		)					(128		)										(128		)
Total derivative       liabilities		(474		)		0			(474		)		82		245			10			(137		)
Securities lending    and similar    arrangements		(606		)		0			(606		)		592		0			0			(14		)
Total		$	(1,080	)		$	0		$	(1,080	)		$	674	$	245		$	10		$	(151	)

For additional information on the Company's financial instruments, see the accompanying Notes 1, 3 and 5 and Notes 1, 3 and 5 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

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FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

Fair Value Hierarchy

U.S. GAAP specifies a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. These two types of inputs create three valuation hierarchy levels. Level 1 valuations reflect quoted market prices for identical assets or liabilities in active markets. Level 2 valuations reflect quoted market prices for similar assets or liabilities in an active market, quoted market prices for identical or similar assets or liabilities in non-active markets or model-derived valuations in which all significant valuation inputs are observable in active markets. Level 3 valuations reflect valuations in which one or more of the significant inputs are not observable in an active market.

The following tables present the fair value hierarchy levels of the Company's assets and liabilities that are measured and carried at fair value on a recurring basis.

	March 31, 2018
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities:(1)
Government and agencies		$	35,325		$	1,411		$	0		$	36,736
Municipalities		0			1,373			0			1,373
Mortgage- and asset-backed securities		0			269			186			455
Public utilities		0			7,724			83			7,807
Sovereign and supranational		0			1,866			0			1,866
Banks/financial institutions		0			9,120			24			9,144
Other corporate		0			31,509			143			31,652
Total fixed maturity securities		35,325			53,272			436			89,033		(1)
Equity securities (1)		1,015			77			16			1,108		(1)
Cash and cash equivalents		4,080			0			0			4,080
Other assets:
Foreign currency swaps		0			130			240			370
Foreign currency forwards		0			426			0			426
Credit default swaps		0			0			1			1
Total other assets		0			556			241			797
Total assets		$	40,420		$	53,905		$	693		$	95,018
Liabilities:
Other liabilities:
Foreign currency swaps		$	0		$	179		$	86		$	265
Foreign currency forwards		0			85			0			85
Foreign currency options		0			3			0			3
Total liabilities		$	0		$	267		$	86		$	353

⁽¹⁾ Includes perpetual securities

	December 31, 2017
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Government and agencies		$	30,109		$	1,121		$	0		$	31,230
Municipalities		0			1,370			0			1,370
Mortgage- and asset-backed securities		0			269			175			444
Public utilities		0			7,886			68			7,954
Sovereign and supranational		0			1,909			0			1,909
Banks/financial institutions		0			8,908			25			8,933
Other corporate		0			32,327			146			32,473
Total fixed maturity securities		30,109			53,790			414			84,313		(1)
Equity securities		1,001			6			16			1,023
Other investments		57			0			0			57
Cash and cash equivalents		3,491			0			0			3,491
Other assets:
Foreign currency swaps		0			146			150			296
Foreign currency forwards		0			22			0			22
Foreign currency options		0			12			0			12
Credit default swaps		0			0			1			1
Total other assets		0			180			151			331
Total assets		$	34,658		$	53,976		$	581		$	89,215
Liabilities:
Other liabilities:
Foreign currency swaps		$	0		$	69		$	128		$	197
Foreign currency forwards		0			274			0			274
Foreign currency options		0			3			0			3
Total liabilities		$	0		$	346		$	128		$	474

⁽¹⁾ Includes perpetual securities

The following tables present the carrying amount and fair value categorized by fair value hierarchy level for the Company's financial instruments that are not carried at fair value.

	March 31, 2018
(In millions)	Carrying Value			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies		$	22,686		$	28,317		$	0		$	0		$	28,317
Municipalities		379			0			493			0			493
Mortgage and asset-backed securities		26			0			9			19			28
Public utilities		3,508			0			3,891			0			3,891
Sovereign and supranational		1,620			0			1,919			0			1,919
Banks/financial institutions		2,300			0			2,477			0			2,477
Other corporate		2,858			0			3,343			0			3,343
Other investments (1)		4,608			0			15			4,575			4,590
Total assets		$	37,985		$	28,317		$	12,147		$	4,594		$	45,058
Liabilities:
Other policyholders’ funds		$	7,417		$	0		$	0		$	7,307		$	7,307
Notes payable (excluding capital leases)		5,352			0			5,146			281			5,427
Total liabilities		$	12,769		$	0		$	5,146		$	7,588		$	12,734

⁽¹⁾Excludes policy loans of $227 and equity method investments of $238, at carrying value

	December 31, 2017
(In millions)	Carrying Value			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies		$	21,331		$	26,491		$	0		$	0		$	26,491
Municipalities		357			0			462			0			462
Mortgage and asset-backed securities		26			0			8			19			27
Public utilities		3,300			0			3,698			0			3,698
Sovereign and supranational		1,523			0			1,835			0			1,835
Banks/financial institutions		2,206			0			2,387			0			2,387
Other corporate		2,687			0			3,172			0			3,172
Other investments (1)		3,017			0			15			2,987			3,002
Total assets		$	34,447		$	26,491		$	11,577		$	3,006		$	41,074
Liabilities:
Other policyholders’ funds		$	6,939		$	0		$	0		$	6,841		$	6,841
Notes payable (excluding capital leases)		5,267			0			5,288			265			5,553
Total liabilities		$	12,206		$	0		$	5,288		$	7,106		$	12,394

⁽¹⁾Excludes policy loans of $210 and equity method investments of $118, at carrying value

Fair Value of Financial Instruments

Fixed maturity and equity securities

The Company determines the fair values of fixed maturity securities and public and privately-issued equity securities using the following approaches or techniques: price quotes and valuations from third party pricing vendors (including quoted market prices readily available from public exchange markets) and non-binding price quotes the Company obtains from outside brokers.

A third party pricing vendor has developed valuation models to determine fair values of privately issued securities to reflect the impact of the persistent economic environment and the changing regulatory framework. These models are discounted cash flow (DCF) valuation models, but also use information from related markets, specifically the CDS market to estimate expected cash flows. These models take into consideration any unique characteristics of the securities and make various adjustments to arrive at an appropriate issuer-specific loss adjusted credit curve. This credit curve is then used with the relevant recovery rates to estimate expected cash flows and modeling of additional features, including illiquidity adjustments, if necessary, to price the security by discounting those loss adjusted cash flows. In cases where a credit curve cannot be developed from the specific security features, the valuation methodology takes into consideration other market observable inputs, including: 1) the most appropriate comparable security(ies) of the issuer; 2) issuer-specific CDS spreads; 3) bonds or CDS spreads of comparable issuers with similar characteristics such as rating, geography, or sector; or 4) bond indices that are comparative in rating, industry, maturity and region.

The pricing data and market quotes the Company obtains from outside sources, including third party pricing services, are reviewed internally for reasonableness. If a fair value appears unreasonable, the Company will re-examine the inputs and assess the reasonableness of the pricing data with the vendor. Additionally, the Company may compare the inputs to relevant market indices and other performance measurements. Based on management's analysis, the valuation is confirmed or may be revised if there is evidence of a more appropriate estimate of fair value based on available market data. The Company has performed verification of the inputs and calculations in any valuation models to confirm that the valuations represent reasonable estimates of fair value.

The fixed maturity securities classified as Level 3 consist of securities with limited or no observable valuation inputs. For Level 3 securities, the Company estimates the fair value of these securities by obtaining non-binding broker quotes from a limited number of brokers. These brokers base their quotes on a combination of their knowledge of the current pricing environment and market conditions. The Company considers these inputs to be unobservable. The Company also considers a variety of significant valuation inputs in the valuation process, including forward exchange rates, yen swap rates, dollar swap rates, interest rate volatilities, credit spread data on specific issuers, assumed default and default recovery rates, and certain probability assumptions. In obtaining these valuation inputs, the Company has determined that certain pricing assumptions and data used by its pricing sources are difficult to validate or corroborate by the market and/or appear to be internally developed rather than observed in or corroborated by the market. The use of these unobservable valuation inputs causes more subjectivity in the valuation process for these securities.

For the periods presented, the Company has not adjusted the quotes or prices it obtains from the pricing services and brokers it uses.

The following tables present the pricing sources for the fair values of the Company's fixed maturity and equity securities.

	March 31, 2018
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Government and agencies:
Third party pricing vendor		$	35,325		$	1,411		$	0		$	36,736
Total government and agencies		35,325			1,411			0			36,736
Municipalities:
Third party pricing vendor		0			1,373			0			1,373
Total municipalities		0			1,373			0			1,373
Mortgage- and asset-backed securities:
Third party pricing vendor		0			269			0			269
Broker/other		0			0			186			186
Total mortgage- and asset-backed securities		0			269			186			455
Public utilities:
Third party pricing vendor		0			7,724			0			7,724
Broker/other		0			0			83			83
Total public utilities		0			7,724			83			7,807
Sovereign and supranational:
Third party pricing vendor		0			1,866			0			1,866
Total sovereign and supranational		0			1,866			0			1,866
Banks/financial institutions:
Third party pricing vendor		0			9,120			0			9,120
Broker/other		0			0			24			24
Total banks/financial institutions		0			9,120			24			9,144
Other corporate:
Third party pricing vendor		0			31,509			0			31,509
Broker/other		0			0			143			143
Total other corporate		0			31,509			143			31,652
Total securities available for sale		$	35,325		$	53,272		$	436		$	89,033	(1)
Equity securities, carried at fair value: (1)
Third party pricing vendor		$	1,015		$	77		$	0		$	1,092
Broker/other		0			0			16			16
Total equity securities		$	1,015		$	77		$	16		$	1,108	(1)

⁽¹⁾ Includes perpetual securities

	March 31, 2018
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies:
Third party pricing vendor		$	28,317		$	0		$	0		$	28,317
Total government and agencies		28,317			0			0			28,317
Municipalities:
Third party pricing vendor		0			493			0			493
Total municipalities		0			493			0			493
Mortgage- and asset-backed securities:
Third party pricing vendor		0			9			0			9
Broker/other		0			0			19			19
Total mortgage- and asset-backed securities		0			9			19			28
Public utilities:
Third party pricing vendor		0			3,891			0			3,891
Total public utilities		0			3,891			0			3,891
Sovereign and supranational:
Third party pricing vendor		0			1,919			0			1,919
Total sovereign and supranational		0			1,919			0			1,919
Banks/financial institutions:
Third party pricing vendor		0			2,477			0			2,477
Total banks/financial institutions		0			2,477			0			2,477
Other corporate:
Third party pricing vendor		0			3,343			0			3,343
Total other corporate		0			3,343			0			3,343
Total securities held to maturity		$	28,317		$	12,132		$	19		$	40,468

	December 31, 2017
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Government and agencies:
Third party pricing vendor		$	30,109		$	1,121		$	0		$	31,230
Total government and agencies		30,109			1,121			0			31,230
Municipalities:
Third party pricing vendor		0			1,370			0			1,370
Total municipalities		0			1,370			0			1,370
Mortgage- and asset-backed securities:
Third party pricing vendor		0			269			0			269
Broker/other		0			0			175			175
Total mortgage- and asset-backed securities		0			269			175			444
Public utilities:
Third party pricing vendor		0			7,886			0			7,886
Broker/other		0			0			68			68
Total public utilities		0			7,886			68			7,954
Sovereign and supranational:
Third party pricing vendor		0			1,807			0			1,807
Broker/other		0			102			0			102
Total sovereign and supranational		0			1,909			0			1,909
Banks/financial institutions:
Third party pricing vendor		0			8,908			0			8,908
Broker/other		0			0			25			25
Total banks/financial institutions		0			8,908			25			8,933
Other corporate:
Third party pricing vendor		0			32,327			0			32,327
Broker/other		0			0			146			146
Total other corporate		0			32,327			146			32,473
Total securities available for sale		$	30,109		$	53,790		$	414		$	84,313	(1)
Equity securities, carried at fair value:
Third party pricing vendor		$	1,001		$	6		$	0		$	1,007
Broker/other		0			0			16			16
Total equity securities		$	1,001		$	6		$	16		$	1,023

⁽¹⁾ Includes perpetual securities

	December 31, 2017
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies:
Third party pricing vendor		$	26,491		$	0		$	0		$	26,491
Total government and agencies		26,491			0			0			26,491
Municipalities:
Third party pricing vendor		0			462			0			462
Total municipalities		0			462			0			462
Mortgage- and asset-backed securities:
Third party pricing vendor		0			8			0			8
Broker/other		0			0			19			19
Total mortgage- and asset-backed securities		0			8			19			27
Public utilities:
Third party pricing vendor		0			3,698			0			3,698
Total public utilities		0			3,698			0			3,698
Sovereign and supranational:
Third party pricing vendor		0			1,835			0			1,835
Total sovereign and supranational		0			1,835			0			1,835
Banks/financial institutions:
Third party pricing vendor		0			2,387			0			2,387
Total banks/financial institutions		0			2,387			0			2,387
Other corporate:
Third party pricing vendor		0			3,172			0			3,172
Total other corporate		0			3,172			0			3,172
Total securities held to maturity		$	26,491		$	11,562		$	19		$	38,072

The following is a discussion of the determination of fair value of the Company's remaining financial instruments.

Derivatives

The Company uses derivative instruments to manage the risk associated with certain assets. However, the derivative instrument may not be classified in the same fair value hierarchy level as the associated asset. Inputs used to value derivatives include, but are not limited to, interest rates, credit spreads, foreign currency forward and spot rates, and interest volatility.

The fair values of the foreign currency forwards and options associated with certain investments; the foreign currency forwards and options used to hedge foreign exchange risk from the Company's net investment in Aflac Japan and economically hedge certain portions of forecasted cash flows denominated in yen; and the foreign currency swaps associated with certain senior notes and subordinated debentures are based on the amounts the Company would expect to receive or pay. The determination of the fair value of these derivatives is based on observable market inputs, therefore they are classified as Level 2.

For derivatives associated with VIEs where the Company is the primary beneficiary, the Company is not the direct counterparty to the swap contracts. As a result, the fair value measurements incorporate the credit risk of the collateral associated with the VIE. The Company receives valuations from a third party pricing vendor for these derivatives. Based on an analysis of these derivatives and a review of the methodology employed by the pricing vendor, the Company determined that due to the long duration of these swaps and the need to extrapolate from short-term observable data to derive and measure long-term inputs, certain inputs, assumptions and judgments are required to value future cash flows that cannot be corroborated by current inputs or current observable market data. As a result, the derivatives associated with the Company's consolidated VIEs are classified as Level 3 of the fair value hierarchy.

Other investments

Other investments where fair value is disclosed above include short-term investments and loan receivables. Loan receivables include transitional real estate loans, commercial mortgage loans and middle market loans. The Company's loan receivables do not have readily determinable market prices and generally lack market liquidity. Fair values for loan receivables are determined based on the present value of expected future cash flows discounted at the applicable U.S. Treasury or London Interbank Offered Rate (LIBOR) yield plus an appropriate spread that considers other risk factors, such as credit and liquidity risk. These spreads are provided by the applicable asset managers based on their knowledge of the current loan pricing environment and market conditions. The spreads are a significant component of the pricing inputs and are generally considered unobservable. Therefore, these investments have been assigned a Level 3 within the fair value hierarchy.

Other policyholders' funds

The largest component of the other policyholders' funds liability is the Company's annuity line of business in Aflac Japan. The Company's annuities have fixed benefits and premiums. For this product, the Company estimates the fair value to be equal to the cash surrender value. This is analogous to the value paid to policyholders on the valuation date if they were to surrender their policy. The Company periodically checks the cash value against discounted cash flow projections for reasonableness. The Company considers its inputs for this valuation to be unobservable and have accordingly classified this valuation as Level 3.

Notes payable

The fair values of the Company's publicly issued notes payable are determined by utilizing available sources of observable inputs from third party pricing vendors and are classified as Level 2. The fair values of the Company's yen-denominated loans approximate their carrying values and are classified as Level 3.

Transfers between Hierarchy Levels and Level 3 Rollforward

During the three-month periods ended March 31, 2018 and 2017, respectively, there were no transfers between Level 1 and 2 for assets and liabilities that are measured and carried at fair value on a recurring basis.

The following tables present the changes in fair value of the Company's investments and derivatives carried at fair value classified as Level 3.

Three Months Ended March 31, 2018
	Fixed Maturity Securities											Equity Securities		Derivatives (1)
(In millions)	Mortgage- and Asset- Backed Securities		Public Utilities			Banks/ Financial Institutions			Other Corporate					Foreign Currency Swaps		Credit Default Swaps		Total
Balance, beginning of period	$	175	$	68		$	25		$	146		$	16	$	22	$	1	$	453
Realized investment gains (losses) included in earnings	0		0			0			0			0		126		0		126
Unrealized gains (losses) included in other comprehensive income (loss)	11		(1		)	(1		)	(2		)	0		6		0		13
Purchases, issuances, sales and settlements:
Purchases	0		16			0			0			0		0		0		16
Issuances	0		0			0			0			0		0		0		0
Sales	0		0			0			0			0		0		0		0
Settlements	0		0			0			(1		)	0		0		0		(1		)
Transfers into Level 3	0		0			0			0			0		0		0		0
Transfers out of Level 3	0		0			0			0			0		0		0		0
Balance, end of period	$	186	$	83		$	24		$	143		$	16	$	154	$	1	$	607
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in realized investment gains (losses)	$	0	$	0		$	0		$	0		$	0	$	126	$	0	$	126

⁽¹⁾ Derivative assets and liabilities are presented net

Three Months Ended March 31, 2017
	Fixed Maturity Securities										Equity Securities			Derivatives (1)
(In millions)	Mortgage- and Asset- Backed Securities			Public Utilities		Banks/ Financial Institutions			Other Corporate					Foreign Currency Swaps			Credit Default Swaps		Total
Balance, beginning of period	$	198		$	16	$	25		$	0	$	3		$	(21	)	$	2	$	223
Realized investment gains (losses) included    in earnings	0			0		0			0		0			38			0		38
Unrealized gains (losses) included in other    comprehensive income (loss)	6			0		(1		)	0		0			2			0		7
Purchases, issuances, sales and settlements:
Purchases	0			0		0			35		2			0			0		37
Issuances	0			0		0			0		0			0			0		0
Sales	0			0		0			0		(1		)	0			0		(1		)
Settlements	(9		)	0		0			0		0			0			0		(9		)
Transfers into Level 3	0			0		0			0		0			0			0		0
Transfers out of Level 3	0			0		0			0		0			0			0		0
Balance, end of period	$	195		$	16	$	24		$	35	$	4		$	19		$	2	$	295
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in realized investment gains (losses)	$	0		$	0	$	0		$	0	$	0		$	38		$	0	$	38

⁽¹⁾ Derivative assets and liabilities are presented net

Fair Value Sensitivity

Level 3 Significant Unobservable Input Sensitivity

The following tables summarize the significant unobservable inputs used in the valuation of the Company's Level 3 investments and derivatives carried at fair value. Included in the tables are the inputs or range of possible inputs that have an effect on the overall valuation of the financial instruments.

March 31, 2018
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities:
Mortgage- and asset-backed securities		$	186	Consensus pricing	Offered quotes	N/A	(c)
Public utilities		83		Discounted cash flow	Credit spreads	N/A	(c)
Banks/financial institutions		24		Consensus pricing	Offered quotes	N/A	(c)
Other corporate		143		Discounted cash flow	Credit spreads	N/A	(c)
Equity securities		16		Net asset value	Offered quotes	N/A	(c)
Other assets:
Foreign currency swaps		185		Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	13 - 101 bps
		55		Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Credit default swaps		1		Discounted cash flow	Base correlation	49.98% - 54.13%	(d)
					CDS spreads	15 bps
					Recovery rate	37.24%
Total assets		$	693

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

(c) N/A represents securities where the Company receives unadjusted broker quotes and for which there is no transparency into the providers' valuation techniques or unobservable inputs.

(d) Range of base correlation for the Company's bespoke tranche for attachment and detachment points corresponding to market indices

March 31, 2018
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Liabilities:
Other liabilities:
Foreign currency swaps		$	84	Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	17 - 170 bps
		2		Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Total liabilities		$	86

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

December 31, 2017
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities:
Mortgage- and asset-backed securities		$	175	Consensus pricing	Offered quotes	N/A	(c)
Public utilities		68		Discounted cash flow	Credit spreads	N/A	(c)
Banks/financial institutions		25		Consensus pricing	Offered quotes	N/A	(c)
Other corporate		146		Discounted cash flow	Credit spreads	N/A	(c)
Equity securities		16		Net asset value	Offered quotes	N/A	(c)
Other assets:
Foreign currency swaps		80		Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	9 - 90 bps
		70		Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Credit default swaps		1		Discounted cash flow	Base correlation	46.33% - 49.65%	(d)
					CDS spreads	25 bps
					Recovery rate	37.24%
Total assets		$	581

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

(c) N/A represents securities where the Company receives unadjusted broker quotes and for which there is no transparency into the providers' valuation techniques or unobservable inputs.

(d) Range of base correlation for the Company's bespoke tranche for attachment and detachment points corresponding to market indices

December 31, 2017
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Liabilities:
Other liabilities:
Foreign currency swaps		$	120	Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	13 - 157 bps
		8		Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Total liabilities		$	128

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

The following is a discussion of the significant unobservable inputs or valuation techniques used in determining the fair value of securities and derivatives classified as Level 3.

Net Asset Value

The Company holds certain unlisted equity securities whose fair value is derived based on the financial statements published by the investee. These securities do not trade on an active market and the valuations derived are dependent on the availability of timely financial reporting of the investee. Net asset value is an unobservable input in the determination of fair value ofequity securities.

Offered Quotes

In circumstances where the Company's valuation model price is overridden because it implies a value that is not consistent with current market conditions, the Company will solicit bids from a limited number of brokers. The Company also receives unadjusted prices from brokers for its mortgage and asset-backed securities. These quotes are non-binding but are reflective of valuation best estimates at that particular point in time. Offered quotes are an unobservable input in the determination of fair value of mortgage- and asset-backed securities, certain banks/financial institutions, certain other corporate, and equity securities investments.

Interest Rates, CDS Spreads, Foreign Exchange Rates

The significant drivers of the valuation of the interest and foreign exchange swaps are interest rates, foreign exchange rates and CDS spreads. The Company's swaps have long maturities that increase the sensitivity of the swaps to interest rate fluctuations. Since most of the Company's yen-denominated cross currency swaps are in a net liability position, an increase in interest rates will decrease the liabilities and increase the value of the swap.

Foreign exchange swaps also have a lump-sum final settlement of foreign exchange principal receivables at the termination of the swap. An increase in yen interest rates will decrease the value of the final settlement foreign exchange receivables and decrease the value of the swap, and an increase in U.S. dollar interest rates will increase the swap value.

A similar sensitivity pattern is observed for the foreign exchange rates. When the spot U.S. dollar/Japanese yen (USD/JPY) foreign exchange rate decreases and the swap is receiving a final exchange payment in JPY, the swap value will increase due to the appreciation of the JPY. Most of the Company's swaps are designed to receive payments in JPY at the termination and will thus be impacted by the USD/JPY foreign exchange rate in this way. In cases where there is no final foreign exchange receivable in JPY and the Company is paying JPY as interest payments and receiving USD, a decrease in the foreign exchange rate will lead to a decrease in the swap value.

The extinguisher feature in most of the Company's VIE swaps results in a cessation of cash flows and no further payments between the parties to the swap in the event of a default on the referenced or underlying collateral. To price this feature, the Company applies the survival probability of the referenced entity to the projected cash flows. The survival probability uses the CDS spreads and recovery rates to adjust the present value of the cash flows. For extinguisher swaps with positive values, an increase in CDS spreads decreases the likelihood of receiving the final exchange payments and reduces the value of the swap.

Base Correlations, CDS Spreads, Recovery Rates

The Company's remaining collateralized debt obligation (CDO) is a tranche on a basket of single-name credit default swaps. The risk in this synthetic CDO comes from the single-name CDS risk and the correlations between the single names. The valuation of synthetic CDOs is dependent on the calibration of market prices for interest rates, single name CDS default probabilities and base correlation using financial modeling tools. Since there is limited or no observable data available for this tranche, the base correlations must be obtained from commonly traded market tranches such as the CDX and iTraxx indices. From the historical prices of these indices, base correlations can be obtained to develop a pricing curve of CDOs with different seniorities. Since the reference entities of the market indices do not match those in the portfolio underlying the synthetic CDO to be valued, several processing steps are taken to map the CDO in the Company's portfolio to the indices. With the base correlation determined and the appropriate spreads selected, a valuation is calculated. An increase in the CDS spreads in the underlying portfolio leads to a decrease in the value due to higher probability of defaults and losses. The impact on the valuation due to base correlation depends on a number of factors, including the riskiness between market tranches and the modeled tranche based on the Company's portfolio and the equivalence between detachment points in these tranches. Generally speaking, an increase in base correlation will decrease the value of the senior tranches while increasing the value of junior tranches. This may result in a positive or negative value change.

The CDO tranche in the Company's portfolio is a senior mezzanine tranche and, due to the low level of credit support for this type of tranche, exhibits equity-like behavior. As a result, an increase in recovery rates tends to cause its value to decrease.

Base correlations, CDS spreads, and recovery rates are unobservable inputs in the determination of fair value of credit default swaps.

For additional information on the Company's investments and financial instruments, see the accompanying Notes 1, 3 and 4 and Notes 1, 3 and 4 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

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POLICY LIABILITIES

3 Months Ended

Mar. 31, 2018

Insurance Loss Reserves [Abstract]

POLICY LIABILITIES

POLICY LIABILITIES

Changes in the liability for unpaid policy claims were as follows:

	Three Months Ended March 31,
(In millions)		2018			2017
Unpaid supplemental health claims, beginning of period		$	3,884		$	3,707
Less reinsurance recoverables		30			27
Net balance, beginning of period		3,854			3,680
Add claims incurred during the period related to:
Current year		1,842			1,737
Prior years		(192		)	(111		)
Total incurred		1,650			1,626
Less claims paid during the period on claims incurred during:
Current year		518			505
Prior years		1,116			1,055
Total paid		1,634			1,560
Effect of foreign exchange rate changes on unpaid claims		142			80
Net balance, end of period		4,012			3,826
Add reinsurance recoverables		31			29
Unpaid supplemental health claims, end of period		4,043			3,855
Unpaid life claims, end of period		587			375
Total liability for unpaid policy claims		$	4,630		$	4,230

The incurred claims development related to prior years reflects favorable claims experience compared to previous estimates. The favorable claims development of $192 million for the three-month period ended March 31, 2018 comprises approximately $97 million from Japan, which represents approximately 51% of the total. Excluding the impact of foreign exchange of a loss of approximately $5 million from December 31, 2017 to March 31, 2018, the favorable claims development in Japan would have been approximately $92 million, representing approximately 48% of the total.

The Company has experienced continued favorable claim trends in 2018 for its core health products in Japan. The Company's experience in Japan related to the average length of stay in the hospital for cancer treatment has shown continued decline in the current period. In addition, cancer treatment patterns in Japan are continuing to be influenced by significant advances in early-detection techniques and by the increased use of pathological diagnosis rather than clinical exams. Additionally, follow-up radiation and chemotherapy treatments are occurring more often on an outpatient basis. Such changes in treatment not only increase the quality of life and initial outcomes for the patients, but also decrease the average length of each hospital stay, resulting in favorable claims development.

The remainder of the favorable claims development related to prior years for the three-month period ended March 31, 2018, reflects Aflac U.S. favorable claims experience compared to previous estimates, primarily in the cancer and accident lines of business.

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REINSURANCE

3 Months Ended

Mar. 31, 2018

Reinsurance Disclosures [Abstract]

REINSURANCE

REINSURANCE

The Company periodically enters into fixed quota-share coinsurance agreements with other companies in the normal course of business. For each of its reinsurance agreements, the Company determines whether the agreement provides indemnification against loss or liability relating to insurance risk in accordance with applicable accounting standards. Reinsurance premiums and benefits paid or provided are accounted for on bases consistent with those used in accounting for the original policies issued and the terms of the reinsurance contracts. Premiums and benefits are reported net of insurance ceded.

The Company has recorded a deferred profit liability related to reinsurance transactions. The remaining deferred profit liability of $1.0 billion, as of March 31, 2018, is included in future policy benefits in the consolidated balance sheet and is being amortized into income over the expected lives of the policies. The Company has also recorded a reinsurance recoverable for reinsurance transactions, which is included in other assets in the consolidated balance sheet and had a remaining balance of $969 million and $908 million as of March 31, 2018, and December 31, 2017, respectively. The increase in the reinsurance recoverable balance was driven by two aggregating factors: yen strengthening and the growth in reserves related to the business that has been reinsured as the policies age. The spot yen/dollar exchange rate strengthened by approximately 6.4%and ceded reserves increased approximately .4% from December 31, 2017, to March 31, 2018.

The following table reconciles direct premium income and direct benefits and claims to net amounts after the effect of reinsurance.

	Three Months Ended March 31,
(In millions)	2018				2017
Direct premium income		$	4,833			$	4,724
Ceded to other companies:
Ceded Aflac Japan closed blocks		(129		)		(130		)
Other		(15		)		(12		)
Assumed from other companies:
Retrocession activities		54				54
Other		2				2
Net premium income		$	4,745			$	4,638
Direct benefits and claims		$	3,119			$	3,129
Ceded benefits and change in reserves for future benefits:
Ceded Aflac Japan closed blocks		(117		)		(122		)
Eliminations		12				13
Other		(12		)		(11		)
Assumed from other companies:
Retrocession activities		52				54
Eliminations		(12		)		(13		)
Other		0				2
Benefits and claims, net		$	3,042			$	3,052

These reinsurance transactions are indemnity reinsurance that do not relieve the Company from its obligations to policyholders. In the event that the reinsurer is unable to meet their obligations, the Company remains liable for the reinsured claims.

As a part of its capital contingency plan, the Company entered into a committed reinsurance facility agreement on December 1, 2015 in the amount of approximately 110 billion yen. This reinsurance facility agreement was renewed in 2017 and is effective until December 31, 2018. There are also additional commitment periods of a one-year duration each which are automatically extended unless notification is received from the reinsurer within 60 days prior to the expiration. The reinsurer can withdraw from the committed facility if Aflac‘s Standard and Poor's (S&P) rating drops below BBB-. As of March 31, 2018, the Company has not executed a reinsurance treaty under this committed reinsurance facility.

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NOTES PAYABLE

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

NOTES PAYABLE

NOTES PAYABLE

A summary of notes payable follows:

(In millions)	March 31, 2018			December 31, 2017
2.40% senior notes due March 2020		$	548		$	548
4.00% senior notes due February 2022		348			348
3.625% senior notes due June 2023		697			697
3.625% senior notes due November 2024		746			745
3.25% senior notes due March 2025		446			446
2.875% senior notes due October 2026		297			297
6.90% senior notes due December 2039		220			220
6.45% senior notes due August 2040		254			254
4.00% senior notes due October 2046		394			394
Yen-denominated senior notes and subordinated debentures:
.932% senior notes due January 2027 (principal amount 60.0 billion yen)		562			528
2.108% subordinated debentures due October 2047 (principal amount 60.0 billion yen)		559			526
Yen-denominated loans:
Variable interest rate loan due September 2021 (.32% in 2018 and 2017, principal amount 5.0 billion yen)		47			44
Variable interest rate loan due September 2023 (.47% in 2018 and 2017, principal amount 25.0 billion yen)		234			220
Capitalized lease obligations payable through 2025		20			22
Total notes payable		$	5,372		$	5,289

Amounts in the table above are reported net of debt issuance costs and issuance premiums or discounts, if applicable, that are being amortized over the life of the notes.

A summary of the Company's lines of credit as of March 31, 2018 follows:

Borrower	Type	Original Term	Expiration Date	Capacity	Amount Outstanding	Interest Rate on Borrowed Amount	Maturity Period	Commitment Fee	Business Purpose
Aflac Incorporated and Aflac	uncommitted bilateral	364 days	November 30, 2018	$100 million	$0 million	The rate quoted by the bank and agreed upon at the time of borrowing	Up to 3 months	None	General corporate purposes
Aflac Incorporated	unsecured revolving	3 years	March 31, 2019, or the date commitments are terminated pursuant to an event of default	100.0 billion yen	0.0 billion yen	A rate per annum equal to (a) Tokyo interbank market rate (TIBOR) plus, the alternative applicable TIBOR margin during the availability period from the closing date to the commitment termination date or (b) the TIBOR rate offered by the agent to major banks in yen for the applicable period plus, the applicable alternative TIBOR margin during the term out period	No later than March 31, 2019	.30% to .50%, depending on the Parent Company's debt ratings as of the date of determination	General corporate purposes, including a capital contingency plan for the operations of the Parent Company
Aflac Incorporated and Aflac	unsecured revolving	5 years	September 18, 2020, or the date commitments are terminated pursuant to an event of default(1)	55.0 billion yen, or the equivalent amount in U.S. dollars	0.0 billion yen	A rate per annum equal to, at the Company's option, either, (a) London Interbank Offered Rate (LIBOR) adjusted for certain costs or (b) a base rate determined by reference to the highest of (1) the federal funds rate plus 1/2 of 1%, (2) the rate of interest for such day announced by Mizuho Bank, Ltd. as its prime rate, or (3) the eurocurrency rate for an interest period of one month plus 1.00%, in each case plus an applicable margin	No later than September 18, 2020(1)	.085% to .225%, depending on the Parent Company's debt ratings as of the date of determination	General corporate purposes, including a capital contingency plan for the operations of the Parent Company
Aflac Incorporated and Aflac	uncommitted bilateral	None specified	None specified	$50 million	$0 million	A rate per annum equal to, at the Parent Company's option, either (a) a eurocurrency rate determined by reference to the agent's LIBOR for the interest period relevant to such borrowing or (b) the base rate determined by reference to the greater of (i) the prime rate as determined by the agent, and (ii) the sum of 0.50% and the federal funds rate for such day	Up to 3 months	None	General corporate purposes
Aflac(2)	uncommitted revolving	364 days	November 30, 2018	$250 million	$0 million	USD three-month LIBOR plus 75 basis points per annum	3 months	None	General corporate purposes
Aflac Incorporated(2)	uncommitted revolving	364 days	April 2, 2018	37.5 billion yen	0.0 billion yen	Three-month TIBOR plus 80 basis points per annum	3 months	None	General corporate purposes

⁽¹⁾ Expiration and maturity period dates were updated in April 2018 to April 4, 2023

⁽²⁾Intercompany credit agreement

The Company was in compliance with all of the covenants of its notes payable and lines of credit at March 31, 2018. No events of default or defaults occurred during the three-month period ended March 31, 2018.

For additional information, see Notes 4 and 9 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

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INCOME TAXES

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

9. INCOME TAXES

For the United States, the Tax Cuts and Jobs Act (Tax Act) was signed into law on December 22, 2017. Effective January 1, 2018, the Tax Act imposes a broad number of changes in tax law, including the permanent reduction of the U.S. federal statutory corporate income tax rate from 35% to 21%.

The Company expects to complete its accounting for the effects of the Tax Act over the measurement period of up to one year from the enactment date, as permitted by SEC Staff Accounting Bulletin No. 118 (SAB 118). As of the enactment date, the Company estimated provisional amounts for its deferred taxes, including related valuation allowance, resulting in a reduction of its deferred tax assets (DTAs) by approximately $1.0 billion and its deferred tax liabilities (DTLs) by $2.9 billion, for a net DTL reduction of approximately $1.9 billion. The Company believes that these amounts represent reasonable estimates in accordance with SAB 118. The provisions of ASC 740-10, Income Taxes, require that the effects of changes in tax law on deferred taxes be recognized as a component of the income tax provision in the period the tax rate change was enacted. Therefore, the $1.9 billion provisional amount of net DTL reduction was recorded in the fourth quarter of 2017 as a reduction in the “Income tax expense, Deferred” line item of the Company’s consolidated statement of earnings. As of the first quarter of 2018, the Company has no update to this estimated benefit.

The following includes an overview of the existing current and deferred balances for which calculation of income tax effects of the Tax Act has not been completed:

Japan deferred tax balances: The Tax Act reduces the U.S. tax rate to 21%, effective January 1, 2018. Prior to the reduction in rate, the Japan deferred tax balances were completely offset by an anticipatory foreign tax credit. As a result of the rate reduction, the Japan deferred tax balance will no longer be offset by an anticipatory foreign tax credit as all of the foreign tax credits will be used to offset the U.S. deferred tax balance of the Aflac Japan branch.

The Company has not yet completed its analysis of the components of the Japan tax computation, including a complete validation of the Aflac Japan tax basis. Additional time is needed to collect, analyze, and validate the detailed data underlying the deferred tax amounts in the Aflac Japan branch. As of the fourth quarter of 2017, the Company had recorded a provisional amount of $4.5 billion of net DTL related to this item.

Valuation allowances: The Company must assess whether its valuation allowance analyses are impacted by various aspects of the Tax Act with a primary focus on any unused anticipatory foreign tax credits. As the Company has recorded provisional amounts related to the Japan deferred tax balances, any corresponding determination of the need for or change in a valuation allowance is also provisional. As of the fourth quarter of 2017, the Company had recorded a provisional valuation allowance of $.7 billion against its anticipatory foreign tax credit asset.

The impact of the Tax Act may differ, possibly materially, from the recorded provisional amounts.

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SHAREHOLDERS' EQUITY

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

SHAREHOLDERS' EQUITY

SHAREHOLDERS’ EQUITY

See Note 1 for a discussion of the stock split that occurred in March 2018. All share and per-share amounts have been adjusted to reflect the stock split for any of the periods presented.

The following table is a reconciliation of the number of shares of the Company's common stock for the three-month periods ended March 31.

(In thousands of shares)	2018		2017
Common stock - issued:
Balance, beginning of period	1,345,762		1,342,498
Exercise of stock options and issuance of restricted shares	1,014		868
Balance, end of period	1,346,776		1,343,366
Treasury stock:
Balance, beginning of period	564,852		530,877
Purchases of treasury stock:
Open market	6,640		16,986
Other	315		288
Dispositions of treasury stock:
Shares issued to AFL Stock Plan	(384	)	(494	)
Exercise of stock options	(305	)	(256	)
Other	(99	)	(40	)
Balance, end of period	571,019		547,361
Shares outstanding, end of period	775,757		796,005

Outstanding share-based awards are excluded from the calculation of weighted-average shares used in the computation of basic earnings per share (EPS). The following table presents the approximate number of share-based awards to purchase shares, on a weighted-average basis, that were considered to be anti-dilutive and were excluded from the calculation of diluted earnings per share for the following periods.

	Three Months Ended March 31,
(In thousands)	2018		2017
Anti-dilutive share-based awards		9		642

Share Repurchase Program

During the first three months of 2018, the Company repurchased 6.6 million shares of its common stock in the open market for $296 million as part of its share repurchase program. During the first three months of 2017, the Company repurchased 17.0 million shares of its common stock in the open market for $600 million as part of its share repurchase program. In August 2017, the Company's board of directors authorized the purchase of an additional 80 million shares of its common stock. As of March 31, 2018, a remaining balance of 91.4 million shares of the Company's common stock was available for purchase under share repurchase authorizations by its board of directors.

Reclassifications from Accumulated Other Comprehensive Income

The tables below are reconciliations of accumulated other comprehensive income by component for the following periods.

Changes in Accumulated Other Comprehensive Income

Three Months Ended March 31, 2018
(In millions)	Unrealized Foreign Currency Translation Gains (Losses)				Unrealized Gains (Losses) on Investment Securities					Unrealized Gains (Losses) on Derivatives				Pension Liability Adjustment				Total
Balance, beginning of period		$	(1,750	)		$	5,964				$	(23	)		$	(163	)		$	4,028
Other comprehensive income (loss) before reclassification		447				(983		)			2				(37		)		(571		)
Amounts reclassified from accumulated other comprehensive income (loss)		0				225			(1)		0				3				228
Net current-period other comprehensive income (loss)		447				(758		)			2				(34		)		(343		)
Balance, end of period		$	(1,303	)		$	5,206				$	(21	)		$	(197	)		$	3,685

⁽¹⁾ Includes amounts reclassified due to changes in accounting principles of $(148) related to financial instruments and $374 related to tax effects from tax reform

All amounts in the table above are net of tax.

Three Months Ended March 31, 2017
(In millions)	Unrealized Foreign Currency Translation Gains (Losses)				Unrealized Gains (Losses) on Investment Securities				Unrealized Gains (Losses) on Derivatives				Pension Liability Adjustment				Total
Balance, beginning of period		$	(1,983	)		$	4,805			$	(24	)		$	(168	)		$	2,630
Other comprehensive income (loss) before reclassification		333				(341		)		2				(4		)		(10		)
Amounts reclassified from accumulated other comprehensive income (loss)		0				10				0				2				12
Net current-period other comprehensive income (loss)		333				(331		)		2				(2		)		2
Balance, end of period		$	(1,650	)		$	4,474			$	(22	)		$	(170	)		$	2,632

All amounts in the table above are net of tax.

For the three-month period ended March 31, 2018, see Note 1 for discussion of the amounts reclassified between AOCI and retained earnings upon the adoption of new accounting pronouncements.

The tables below summarize the amounts reclassified from each component of accumulated other comprehensive income into net earnings for the following periods.

Reclassifications Out of Accumulated Other Comprehensive Income

(In millions)	Three Months Ended March 31, 2018
Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income				Affected Line Item in the Statements of Earnings
Unrealized gains (losses) on available-for-sale securities		$	2		Sales and redemptions
		0			Other-than-temporary impairment losses realized
		2			Total before tax
		(1		)	Tax (expense) or benefit(1)
		$	1		Net of tax
Amortization of defined benefit pension items:
Actuarial gains (losses)		$	(4	)	Acquisition and operating expenses(2)
Prior service (cost) credit		0			Acquisition and operating expenses(2)
		1			Tax (expense) or benefit(1)
		$	(3	)	Net of tax
Total reclassifications for the period		$	(2	)	Net of tax

⁽¹⁾ Based on 27% blended tax rate

⁽²⁾ These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 12 for additional details).

(In millions)	Three Months Ended March 31, 2017
Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income				Affected Line Item in the Statements of Earnings
Unrealized gains (losses) on available-for-sale securities		$	(6	)	Sales and redemptions
		(10		)	Other-than-temporary impairment losses realized
		(16		)	Total before tax
		6			Tax (expense) or benefit(1)
		$	(10	)	Net of tax
Amortization of defined benefit pension items:
Actuarial gains (losses)		$	(3	)	Acquisition and operating expenses(2)
Prior service (cost) credit		0			Acquisition and operating expenses(2)
		1			Tax (expense) or benefit(1)
		$	(2	)	Net of tax
Total reclassifications for the period		$	(12	)	Net of tax

⁽¹⁾ Based on 35% tax rate

⁽²⁾ These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 12 for additional details)

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SHARE-BASED COMPENSATION

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION

See Note 1 for a discussion of the stock split that occurred in March 2018. All share and per-share amounts have been adjusted to reflect the stock split for any of the periods presented.

As of March 31, 2018, the Company has outstanding share-based awards under the Aflac Incorporated Long-Term Incentive Plan (the “Plan”). Share-based awards are designed to reward employees for their long-term contributions to the Company and provide incentives for them to remain with the Company. The number and frequency of share-based awards are based on competitive practices, operating results of the Company, government regulations, and other factors.

The Plan, as amended on February 14, 2017, allows for a maximum number of shares issuable over its term of 75 million shares including 38 million shares that may be awarded in respect of awards other than options or stock appreciation rights. If any awards granted under the Plan are forfeited or are terminated before being exercised or settled for any reason other than tax forfeiture, then the shares underlying the awards will again be available under the Plan.

The Plan allows awards to Company employees for incentive stock options (ISOs), non-qualifying stock options (NQSOs), restricted stock, restricted stock units, and stock appreciation rights. Non-employee directors are eligible for grants of NQSOs, restricted stock, and stock appreciation rights. As of March 31, 2018, approximately 40.5 million shares were available for future grants under this plan. The ISOs and NQSOs have a term of 10 years, and the share-based awards generally vest upon time-based conditions or time and performance-based conditions. Time-based vesting generally occurs after three years. Performance-based vesting conditions generally include the attainment of goals related to Company financial performance. As of March 31, 2018, the only performance-based awards issued and outstanding were restricted stock awards.

Stock options and stock appreciation rights granted under the amended Plan have an exercise price of at least the fair market value of the underlying stock on the grant date and have an expiration date no later than 10 years from the grant date. Time-based restricted stock awards, restricted stock units and stock options granted after January 1, 2017 generally vest on a ratable basis over three years, and awards granted prior to the amendment vest on a three-year cliff basis. The Compensation Committee of the Board of Directors has the discretion to determine vesting schedules.

Share-based awards granted to U.S.-based grantees are settled with authorized but unissued Company stock, while those issued to Japan-based grantees are settled with treasury shares.

The following table provides information on stock options outstanding and exercisable at March 31, 2018.

	Stock Option Shares (in thousands)		Weighted-Average Remaining Term (in years)		Aggregate Intrinsic Value (in millions)			Weighted-Average Exercise Price Per Share
Outstanding		6,306		5.5		$	99		$	28.03
Exercisable		4,439		4.4		77			26.45

The Company received cash from the exercise of stock options in the amount of $23 million during the first three months of 2018, compared with $17 million in the first three months of 2017. The tax benefit realized as a result of stock option exercises and restricted stock releases was $12 million in the first three months of 2018, compared with $14 million in the first three months of 2017.

As of March 31, 2018, total compensation cost not yet recognized in the Company's financial statements related to restricted stock awards was $62 million, of which $30 million (826 thousand shares) was related to restricted stock awards with a performance-based vesting condition. The Company expects to recognize these amounts over a weighted-average period of approximately 1.5 years. There are no other contractual terms covering restricted stock awards once vested.

The following table summarizes restricted stock activity during the three-month period ended March 31.

(In thousands of shares)	Shares		Weighted-Average Grant-Date Fair Value Per Share
Restricted stock at December 31, 2017	3,635			$	32.40
Granted in 2018	918			44.12
Canceled in 2018	(56	)		33.18
Vested in 2018	(980	)		31.50
Restricted stock at March 31, 2018	3,517			$	35.70

In February 2018, the Company granted 432 thousand performance-based stock awards, which are contingent on the achievement of the Company's financial performance metrics and its market-based conditions. On the date of grant, the Company estimated the fair value of restricted stock awards with market-based conditions using a Monte Carlo simulation model. The model discounts the value of the stock at the assumed vesting date based on the risk-free interest rate. Based on estimates of actual performance versus the vesting thresholds, the calculated fair value percentage pay-out estimate will be updated each quarter.

The Company uses third-party analyses to assist in developing the assumptions used in, as well as calibrating, a Monte Carlo simulation model. The Company is responsible for determining the assumptions used in estimating the fair value of its share-based payment awards.

For additional information on the Company's long-term share-based compensation plans and the types of share-based awards, see Note 12 of the Notes to the Consolidated Financial Statements included in the 2017 Annual Report.

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BENEFIT PLANS

3 Months Ended

Mar. 31, 2018

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

BENEFIT PLANS

BENEFIT PLANS

The Company has funded defined benefit plans in Japan and the United States, however the U.S. plan was frozen to new participants effective October 1, 2013. The Company also maintains non-qualified, unfunded supplemental retirement plans that provide defined pension benefits in excess of limits imposed by federal tax law for certain Japanese, U.S. and former employees, however the U.S. plan was frozen to new participants effective January 1, 2015. U.S. employees who are not participants in the defined benefit plan receive a nonelective 401(k) employer contribution.

The Company provides certain health care benefits for eligible U.S. retired employees, their beneficiaries and covered dependents ("other postretirement benefits"). The health care plan is contributory and unfunded. Effective January 1, 2014, employees eligible for benefits included the following: (1) active employees whose age plus service, in years, equaled or exceeded 80 (rule of 80); (2) active employees who were age 55 or older and have met the 15 years of service requirement; (3) active employees who would meet the rule of 80 in the next five years; (4) active employees who were age 55 or older and who would meet the 15 years of service requirement within the next five years; and (5) current retirees. For certain employees and former employees, additional coverage is provided for all medical expenses for life.

Pension and other postretirement benefit expenses are included in acquisition and operating expenses in the consolidated statement of earnings, which includes $5 million of other components of net periodic pension cost and postretirement costs (other than service costs) for the three months ended March 31, 2018 and 2017, respectively. Total net periodic cost includes the following components:

	Three Months Ended March 31,
	Pension Benefits																Other
	Japan								U.S.								Postretirement Benefits
(In millions)	2018				2017				2018				2017				2018			2017
Components of net periodic benefit cost:
Service cost		$	5			$	5			$	7			$	6			$	0		$	0
Interest cost		2				1				9				8				0			0
Expected return on plan assets		(2		)		(1		)		(7		)		(6		)		0			0
Amortization of net actuarial loss		0				0				4				3				0			0
Amortization of prior service cost (credit)		0				0				0				0				0			0
Net periodic (benefit) cost		$	5			$	5			$	13			$	11			$	0		$	0

During the three months ended March 31, 2018, Aflac Japan contributed approximately $6 million (using the weighted-average yen/dollar exchange rate for the three-month period ending March 31, 2018) to the Japanese funded defined benefit plan, and Aflac U.S. contributed $10 million to the U.S. funded defined benefit plan.

As a result of U.S. tax reform legislation enacted in December 2017, the Company announced it would make a one-time contribution of $500 to the U.S. 401(k) plan to all employees active on December 31, 2017. This contribution was made by January 31, 2018. The Company also announced that it would increase its matching contributions to 100% of each employee's contributions which were not in excess of 4% of the employee's annual cash compensation. This increase became effective on January 1, 2018.

For additional information regarding the Company's Japanese and U.S. benefit plans, see Note 14 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report.

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COMMITMENTS AND CONTINGENT LIABILITIES

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENT LIABILITIES

COMMITMENTS AND CONTINGENT LIABILITIES

The Company is a defendant in various lawsuits considered to be in the normal course of business. Members of the Company's senior legal and financial management teams review litigation on a quarterly and annual basis. The final results of any litigation cannot be predicted with certainty. Although some of this litigation is pending in states where large punitive damages, bearing little relation to the actual damages sustained by plaintiffs, have been awarded in recent years, the Company believes the outcome of pending litigation will not have a material adverse effect on its financial position, results of operations, or cash flows.

See Note 3 of the Notes to the Consolidated Financial Statements for details on investment commitments.

Guaranty Fund Assessments

The United States insurance industry has a policyholder protection system that is monitored and regulated by state insurance departments. These life and health insurance guaranty associations are state entities (in all 50 states as well as Puerto Rico and the District of Columbia) created to protect policyholders of an insolvent insurance company. All insurance companies (with limited exceptions) licensed to sell life or health insurance in a state must be members of that state’s guaranty association. Under state guaranty association laws, certain insurance companies can be assessed (up to prescribed limits) for certain obligations to the policyholders and claimants of impaired or insolvent insurance companies that write the same line or similar lines of business.

In 2009, the Pennsylvania Insurance Commissioner placed long-term care insurer Penn Treaty Network America Insurance Company and its subsidiary American Network Insurance Company (collectively referred to as Penn Treaty), neither of which is affiliated with Aflac, in rehabilitation and petitioned a state court for approval to liquidate Penn Treaty. A final order of liquidation was granted by a recognized judicial authority on March 1, 2017, and as a result, Penn Treaty is in the process of liquidation. The Company estimated and recognized the impact of its share of guaranty fund assessments resulting from the liquidation using a discounted rate of 4.25%. The Company recognized a discounted liability for the assessments of $62 million (undiscounted $94 million), offset by discounted premium tax credits of $48 million (undiscounted $74 million), for a net $14 million impact to net income in the quarter ended March 31, 2017. The Company paid a majority of these assessments by March 31, 2018, and a majority of the tax credits will be realized over the next four years. The Company used the cost estimate provided as of the liquidation date by the National Organization of Life and Health Guaranty Associations (NOLHGA) to calculate its estimated assessments and tax credits.

Guaranty fund assessments for the three-month period ended March 31, 2018 were immaterial.

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SUBSEQUENT EVENTS

3 Months Ended

Mar. 31, 2018

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS

On April 1, 2018, the Company completed the conversion of Aflac Japan from a branch structure to a legal subsidiary. The treatment of Aflac Japan as a branch for U.S. tax purposes did not change following the completion of this conversion.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Basis of Presentation

Description of Business

Aflac Incorporated (the Parent Company) and its subsidiaries (collectively, the Company) primarily sell supplemental health and life insurance in the United States and Japan. The Company's insurance business is marketed and administered through American Family Life Assurance Company of Columbus (Aflac) in the United States (Aflac U.S.) and as a branch in Japan (Aflac Japan). The conversion of Aflac Japan from a branch to a legal subsidiary was completed on April 1, 2018 (see Note 14), after which date the Company's insurance business is marketed and administered through American Family Life Assurance Company of Columbus (Aflac) in the United States (Aflac U.S.) and through Aflac Life Insurance Japan Ltd. in Japan (Aflac Japan). American Family Life Assurance Company of New York (Aflac New York) is a wholly owned subsidiary of Aflac. Most of Aflac's policies are individually underwritten and marketed through independent agents. Additionally, Aflac U.S. markets and administers group products through Continental American Insurance Company (CAIC), branded as Aflac Group Insurance. The Company's insurance operations in the United States and Japan service the two markets for the Company's insurance business. Aflac Japan's revenues, including realized gains and losses on its investment portfolio, accounted for 71% and 69% of the Company's total revenues in the three-month periods ended March 31, 2018 and 2017, respectively. The percentage of the Company's total assets attributable to Aflac Japan was 85% at March 31, 2018, compared with 83% at December 31, 2017.

Basis of Presentation

The Company prepares its financial statements in accordance with U.S. generally accepted accounting principles (GAAP). These principles are established primarily by the Financial Accounting Standards Board (FASB). In these Notes to the Consolidated Financial Statements, references to U.S. GAAP issued by the FASB are derived from the FASB Accounting Standards Codification^TM (ASC). The preparation of financial statements in conformity with U.S. GAAP requires the Company to make estimates based on currently available information when recording transactions resulting from business operations. The most significant items on the Company's balance sheet that involve a greater degree of accounting estimates and actuarial determinations subject to changes in the future are the valuation of investments and derivatives, deferred policy acquisition costs (DAC), liabilities for future policy benefits and unpaid policy claims, and income taxes. These accounting estimates and actuarial determinations are sensitive to market conditions, investment yields, mortality, morbidity, commission and other acquisition expenses, and terminations by policyholders. As additional information becomes available, or actual amounts are determinable, the recorded estimates will be revised and reflected in operating results. Although some variability is inherent in these estimates, the Company believes the amounts provided are adequate.

The unaudited consolidated financial statements include the accounts of the Parent Company, its subsidiaries and those entities required to be consolidated under applicable accounting standards. All material intercompany accounts and transactions have been eliminated.

In the opinion of management, the accompanying unaudited consolidated financial statements of the Company contain all adjustments, consisting of normal recurring accruals, which are necessary to fairly present the consolidated balance sheets as of March 31, 2018, and December 31, 2017, the consolidated statements of earnings and comprehensive income (loss), shareholders' equity and cash flows for the three-month periods ended March 31, 2018 and 2017. Results of operations for interim periods are not necessarily indicative of results for the entire year. As a result, these financial statements should be read in conjunction with the financial statements and notes thereto included in the Company's annual report on Form 10-K for the year ended December 31, 2017 (2017 Annual Report).

Reclassifications

Reclassifications: Certain reclassifications have been made to prior-year amounts to conform to current-year reporting classifications. These reclassifications had no impact on net earnings or total shareholders' equity.

Perpetual securities have been reclassified in prior periods from a separate line item to fixed maturity securities to conform to current period reporting classifications. This reclassification had no impact on net earnings or total shareholder’s equity.

Recently Adopted Accounting Pronouncements

Recently Adopted Accounting Pronouncements

Technical Corrections and Improvements to Financial Instruments - Overall: In February 2018, the FASB issued amendments to clarify certain aspects of the guidance issued in the original Financial Instruments - Overall - Recognition and Measurement pronouncement summarized below. Specifically, for entities who have chosen the measurement alternative approach for equity securities without readily determinable fair values, the amendments clarify that entities may change from a measurement alternative approach to a fair value method through an irrevocable election that would apply to a specific equity security and all identical or similar investments of the same issuer; entities should use an observable price at the date of the transaction rather than reporting date for the measurement alternative calculation; and insurance companies should use a prospective transition method when applying the measurement alternative. The amendments are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years beginning after June 15, 2018. All entities may early adopt these amendments for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, as long as they have adopted the Financial Instruments - Overall - Recognition and Measurement guidance discussed below. The Company elected to early adopt this technical correction and improvement guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company’s financial position, results of operations, or disclosures.

Income Statement - Reporting Comprehensive Income - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income: In February 2018, the FASB issued amendments which allow a reclassification from accumulated other comprehensive income (AOCI) to retained earnings of the effects of the change in the U.S. federal income tax rate resulting from the Tax Cuts and Jobs Act (Tax Act) on the gross deferred tax amounts and the corresponding valuation allowances related to items remaining in AOCI. The amendments eliminate the stranded tax effects resulting from the Tax Act and also require certain disclosures about the reclassified tax effects. The amendments are effective for all entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Public business entities may early adopt this guidance in any interim reporting period for which financial statements have not yet been issued. The amendments should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Act is recognized. The Company elected to early adopt this guidance as of January 1, 2018. The amounts reclassified from AOCI to retained earnings include the income tax effects of the change in the federal corporate tax rate enacted by the Tax Act. The Company’s policy is to follow the portfolio approach for releasing income tax effects from AOCI. The adoption of this guidance resulted in an increase to beginning 2018 AOCI of $374 million with a corresponding decrease to beginning 2018 retained earnings as of January 1, 2018.

Compensation - Stock Compensation - Scope of Modification Accounting: In May 2017, the FASB issued amendments to provide guidance clarifying when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. An entity should apply modification accounting if the fair value, vesting conditions or classification of the award (as an equity instrument or liability instrument) changes as a result of the change in terms or conditions of the award. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Compensation - Retirement Benefit - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost: In March 2017, the FASB issued amendments requiring that an employer report the service cost component of net periodic pension cost and net periodic postretirement benefit cost in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net periodic pension cost and net periodic postretirement benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. If a separate line item or items are used to present the other components of net benefit cost, that line item or items must be appropriately described. If a separate line item or items are not used, the line item or items used in the income statement to present the other components of net benefit cost must be disclosed. The amendments in this update also allow only the service cost component to be eligible for capitalization when applicable. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets - Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets: In February 2017, the FASB issued amendments that clarify the scope and accounting guidance for the derecognition of a nonfinancial asset or a financial asset that meets the definition of an "in substance nonfinancial asset." The amendments define an "in substance nonfinancial asset" and provide additional accounting guidance for partial sales of nonfinancial assets. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

Business Combinations - Clarifying the Definition of a Business: In January 2017, the FASB issued amendments clarifying when a set of assets and activities is a business. The amendments provide a screen to exclude transactions where substantially all the fair value of the transferred set is concentrated in a single asset, or group of similar assets, from being evaluated as a business. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Statement of Cash Flows - Restricted Cash: In November 2016, the FASB issued amendments requiring that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory: In October 2016, the FASB issued amendments that require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments: In August 2016, the FASB issued amendments that provide guidance on eight specific statement of cash flows classification issues. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, statements of cash flows, or disclosures.

Financial Instruments - Overall - Recognition and Measurement of Financial Assets and Financial Liabilities: In January 2016, the FASB issued guidance to address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The main provisions of this guidance require certain equity investments to be measured at fair value with changes in fair value recognized in net earnings; separate presentation in other comprehensive income for changes in fair value of financial liabilities measured under the fair value option that are due to instrument-specific credit risk; and changes in disclosures associated with the fair value of financial instruments. The guidance also clarifies that entities should evaluate the need for a valuation allowance on a deferred tax asset (DTA) related to available-for-sale (AFS) securities in combination with the entity's other DTAs. The Company adopted this guidance as of January 1, 2018. The Company recorded a cumulative effect adjustment with an increase to beginning 2018 retained earnings and a decrease to beginning 2018 AOCI of $148 million, net of taxes.

Revenue from Contracts with Customers: In May 2014, the FASB issued updated guidance that affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (e.g., insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company adopted this guidance as of January 1, 2018. The adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures.

Description of Accounting Pronouncements Pending Adoption

Accounting Pronouncements Pending Adoption

Leases - Land Easement Practical Expedient for Transition to Topic 842: In January 2018, FASB issued guidance which provides an entity with the option to elect a transition practical expedient to not evaluate, under Topic 842, land easements that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. The amendments clarify that new or modified land easements should be evaluated under the new leases standard once an entity has adopted the new standard. The amendments are effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on the Company's financial position, results of operations, or disclosures.

Derivatives and Hedging - Targeted Improvements to Accounting for Hedging Activities: In August 2017, FASB issued guidance which improves and simplifies the accounting rules around hedge accounting and will create more transparency around how economic results are presented on financial statements. Issues addressed in this new guidance include: 1) risk component hedging, 2) accounting for the hedged item in fair value hedges of interest rate risk, 3) recognition and presentation of the effects of hedging instruments, and 4) amounts excluded from the assessment of hedge effectiveness. The amendments are effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted in any interim period after issuance of the guidance. The adoption of this guidance is not expected to have a significant impact on the Company's financial position, results of operations, or disclosures.

Receivables - Nonrefundable Fees and Other Costs - Premium Amortization on Purchased Callable Debt Securities: In March 2017, the FASB issued amendments to shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount. The amendments are effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The adoption of this guidance is not expected to have a significant impact on the Company's financial position, results of operations, or disclosures.

Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment: In January 2017, the FASB issued amendments simplifying the subsequent measurement of goodwill. An entity, under this update, is no longer required to perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, the entity should perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. The amendments are effective for public business entities that are SEC filers for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for any goodwill impairment tests performed on testing dates after January 1, 2017. The Company does not expect the adoption of this guidance to have a significant impact on its financial position, results of operations, or disclosures.

Financial Instruments - Credit Losses - Measurement of Credit Losses on Financial Instruments: In June 2016, the FASB issued amendments that require a financial asset (or a group of financial assets) measured on an amortized cost basis to be presented net of an allowance for credit losses in order to reflect the amount expected to be collected on the financial asset(s). The measurement of expected credit losses is amended by replacing the incurred loss impairment methodology in current U.S. GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform about a credit loss. Credit losses on available-for-sale debt securities will continue to be measured in a manner similar to current U.S. GAAP; however, the amendments require that credit losses be presented as an allowance rather than as a write-down. Other amendments include changes to the balance sheet presentation and interest income recognition of purchased financial assets with a more-than-insignificant amount of credit deterioration since origination (PCD financial assets).

The amendments are effective for public companies for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Companies may early adopt this guidance as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The amendments will be adopted following a modified-retrospective approach resulting in a cumulative effect adjustment in retained earnings as of the beginning of the year of adoption. Two exceptions to this adoption method are for PCD financial assets and debt securities for which other-than-temporary impairment (OTTI) will have been recognized before the effective date. Loans purchased with credit deterioration accounted for under current U.S. GAAP as "purchased credit impaired" (PCI) financial assets will be classified as PCD financial assets at transition and PCD guidance will be applied prospectively. Debt securities that have experienced OTTI before the effective date will follow a prospective adoption method which allows an entity to maintain the same amortized cost basis before and after the effective date.

The Company has identified certain financial instruments in scope of this guidance to include certain fixed maturity securities, loan and loan receivables and reinsurance recoverables (See Notes 3 and 7 for current balances of instruments in scope). The Company is continuing its progress towards updating its credit loss projection models and accounting systems in order to comply with the required changes in measurement of credit losses. The Company currently expects loans and loan receivables and held-to-maturity fixed maturity securities to be the asset classes most significantly impacted upon adoption of the guidance. The Company continues to evaluate the impact of adoption of this guidance on its financial position, results of operations, and disclosures.

Leases: In February 2016, the FASB issued updated guidance for accounting for leases. Per the amendments, lessees will be required to recognize all leases on the balance sheet with the exception of short-term leases. A lease liability will be recorded for the obligation of a lessee to make lease payments arising from a lease. A right-of-use asset will be recorded which represents the lessee’s right to use, or to control the use of, a specified asset for a lease term. Under the new guidance, lessor accounting is largely unchanged. The amendments are effective for public companies for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The Company has identified certain operating leases in scope of this guidance to include office space and equipment leases (See Note 15 of the Notes to the Consolidated Financial Statements in the 2017 Annual Report for current balances of leases in scope). The leases within scope of this guidance will increase the Company's right-of-use assets and lease liabilities recorded on its statement of financial position, however the Company estimates leases within scope of the guidance to represent less than 1% of its total assets as of March 31, 2018. The Company estimates that the adoption of this guidance will not have a significant impact on its financial position, results of operations, or disclosures.

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BUSINESS SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Reconciliation of Revenue from Segments to Consolidated

	Three Months Ended March 31,
(In millions)	2018			2017
Revenues:
Aflac Japan:
Net earned premiums	$	3,263		$	3,194
Net investment income, less amortized hedge costs (1)	588			557
Other income	12			10
Total Aflac Japan	3,863			3,761
Aflac U.S.:
Net earned premiums	1,427			1,390
Net investment income	175			178
Other income	2			1
Total Aflac U.S.	1,604			1,569
Corporate and other (2)	79			67
Total adjusted revenues	5,546			5,397
Realized investment gains (losses) (1),(2)	(82		)	(88		)
Total revenues	$	5,464		$	5,309

⁽¹⁾ Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $52 for the three-month periods ended March 31, 2018, and 2017, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from net investment income when analyzing segment operations.

⁽²⁾ Amortized hedge costs in Aflac Japan were offset by derivatives entered into as part of corporate activities and resulted in a benefit of $2 for the three-month period ended March 31, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in net investment income when analyzing operations.

Reconciliation of Adjusted Profit (Loss) from Segments to Consolidated

	Three Months Ended March 31,
(In millions)	2018			2017
Pretax earnings:
Aflac Japan (1)	$	818		$	769
Aflac U.S.	337			310
Corporate and other (2)	(46		)	(52		)
Pretax adjusted earnings	1,109			1,027
Realized investment gains (losses) (1),(2),(3)	(98		)	(109		)
Other income (loss)	(29		)	(20		)
Total earnings before income taxes	$	982		$	898
Income taxes applicable to pretax adjusted earnings	$	289		$	351
Effect of foreign currency translation on after-tax adjusted earnings	21			5

⁽¹⁾ Amortizedhedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $52 for the three-month periods ended March 31, 2018, and 2017, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from pretax adjusted earnings when analyzing segment operations.

⁽²⁾ Amortized hedge costs in Aflac Japan were offset by derivatives entered into as part of corporate activities and resulted in a benefit of $2 for the three-month period ended March 31, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in pretax adjusted earnings when analyzing operations.

⁽³⁾ Excluding a gain of $17 and $21 for the three-month periods ended March 31, 2018, and 2017, respectively, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable which is included in adjusted earnings when analyzing segment operations

Reconciliation of Assets from Segment to Consolidated

Assets were as follows:

(In millions)	March 31, 2018			December 31, 2017
Assets:
Aflac Japan		$	125,174		$	114,402
Aflac U.S.		19,706			19,893
Corporate and other		2,476			2,922
Total assets		$	147,356		$	137,217

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INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2018

Available-for-sale Securities

	December 31, 2017
(In millions)	Cost or Amortized Cost				Gross Unrealized Gains			Gross Unrealized Losses			Fair   Value
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Yen-denominated:
Japan government and agencies		$	27,980			$	3,363		$	271		$	31,072
Municipalities		314				28			12			330
Mortgage- and asset-backed securities		242				29			0			271
Public utilities		1,635				352			6			1,981
Sovereign and supranational		1,380				190			1			1,569
Banks/financial institutions		4,742				811			53			5,500
Other corporate		4,085				809			7			4,887
Total yen-denominated		40,378				5,582			350			45,610
U.S dollar-denominated:
U.S. government and agencies		146				13			1			158
Municipalities		872				168			0			1,040
Mortgage- and asset-backed securities		161				12			0			173
Public utilities		5,116				884			27			5,973
Sovereign and supranational		267				73			0			340
Banks/financial institutions		2,808				633			8			3,433
Other corporate		25,384				2,620			418			27,586
Total U.S. dollar-denominated		34,754				4,403			454			38,703
Total securities available for sale		$	75,132	(1)		$	9,985		$	804		$	84,313	(1)

⁽¹⁾ Includes perpetual securities ($1,462 at amortized cost and $1,789 at fair value)

The amortized cost for the Company's investments in debt securities, the cost for equity securities and the fair values of these investments are shown in the following tables.

	March 31, 2018
(In millions)	Cost or Amortized Cost				Gross Unrealized Gains			Gross Unrealized Losses			Fair   Value
Securities available for sale, carried at fair value through other comprehensive income:
Fixed maturity securities: (1)
Yen-denominated:
Japan government and agencies		$	32,961			$	3,811		$	192		$	36,580
Municipalities		350				33			11			372
Mortgage- and asset-backed securities		254				30			0			284
Public utilities		1,739				325			4			2,060
Sovereign and supranational		1,348				212			27			1,533
Banks/financial institutions		5,157				799			76			5,880
Other corporate		4,345				754			8			5,091
Total yen-denominated		46,154				5,964			318			51,800
U.S. dollar-denominated:
U.S. government and agencies		148				9			1			156
Municipalities		866				135			0			1,001
Mortgage- and asset-backed securities		165				7			1			171
Public utilities		5,223				631			107			5,747
Sovereign and supranational		274				59			0			333
Banks/financial institutions		2,841				457			34			3,264
Other corporate		25,936				1,736			1,111			26,561
Total U.S. dollar-denominated		35,453				3,034			1,254			37,233
Total securities available for sale		$	81,607	(1)		$	8,998		$	1,572		$	89,033	(1)

⁽¹⁾ Includes perpetual securities ($1,506 at amortized cost and $1,774 at fair value)

	December 31, 2017
(In millions)		Fair Value
Equity securities, carried at fair value:
Equity securities:
Yen-denominated			$	695
U.S. dollar-denominated			328
Total equity securities			$	1,023

Held-to-maturity Securities

	March 31, 2018
(In millions)	Cost or Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair   Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Yen-denominated:
Japan government and agencies		$	22,686		$	5,631		$	0		$	28,317
Municipalities		379			114			0			493
Mortgage- and asset-backed securities		26			2			0			28
Public utilities		3,508			383			0			3,891
Sovereign and supranational		1,620			299			0			1,919
Banks/financial institutions		2,300			190			13			2,477
Other corporate		2,858			485			0			3,343
Total yen-denominated		33,377			7,104			13			40,468
Total securities held to maturity		$	33,377		$	7,104		$	13		$	40,468

	December 31, 2017
(In millions)	Cost or Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Yen-denominated:
Japan government and agencies		$	21,331		$	5,160		$	0		$	26,491
Municipalities		357			105			0			462
Mortgage- and asset-backed securities		26			1			0			27
Public utilities		3,300			398			0			3,698
Sovereign and supranational		1,523			312			0			1,835
Banks/financial institutions		2,206			190			9			2,387
Other corporate		2,687			485			0			3,172
Total yen-denominated		31,430			6,651			9			38,072
Total securities held to maturity		$	31,430		$	6,651		$	9		$	38,072

Equity securities, FV-NI

	March 31, 2018
(In millions)		Fair   Value
Equity securities, carried at fair value through   net earnings:
Equity securities: (1)
Yen-denominated			$	711
U.S. dollar-denominated			397
Total equity securities			$	1,108	(1)

⁽¹⁾ Includes perpetual securities ($71 at fair value)

Investments Classified by Contractual Maturity Date

The contractual and economic maturities of the Company's investments in fixed maturity securities at March 31, 2018, were as follows:

(In millions)	Amortized Cost			Fair Value
Available for sale: (1)
Due in one year or less		$	485		$	502
Due after one year through five years		9,685			9,551
Due after five years through 10 years		10,637			11,143
Due after 10 years		60,381			67,382
Mortgage- and asset-backed securities		419			455
Total fixed maturity securities available for sale		$	81,607		$	89,033
Held to maturity:
Due in one year or less		$	1,036		$	1,049
Due after one year through five years		508			527
Due after five years through 10 years		1,597			1,754
Due after 10 years		30,210			37,110
Mortgage- and asset-backed securities		26			28
Total fixed maturity securities held to maturity		$	33,377		$	40,468

⁽¹⁾ Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)

Investment Exposures Exceeding Ten Percent Shareholders Equity

Investment exposures that individually exceeded 10% of shareholders' equity were as follows:

	March 31, 2018			December 31, 2017
(In millions)	Credit Rating	Amortized Cost	Fair Value	Credit Rating	Amortized Cost	Fair Value
Japan National Government(1)	A	$54,465	$63,576	A	$48,399	$56,532

⁽¹⁾Japan Government Bonds (JGBs) or JGB-backed securities

Gain (Loss) on Investments

Information regarding pretax realized gains and losses from investments is as follows:

	Three Months Ended March 31,
(In millions)	2018				2017
Realized investment gains (losses):
Fixed maturity securities: (1)
Available for sale:
Gross gains from sales	$	9			$	12
Gross losses from sales	(4		)		(15		)
Net gains (losses) from redemptions	(2		)		(28		)
Other-than-temporary impairment losses	0				(4		)
Total fixed maturity securities	3				(35		)
Equity securities (2)	(46		)	(1)	19			(3)
Loan loss reserves	(7		)		(1		)
Derivatives and other:
Derivative gains (losses)	144				(52		)
Foreign currency gains (losses)	(228		)		(71		)
Total derivatives and other	(84		)		(123		)
Total realized investment gains (losses)	$	(134	)		$	(140	)

⁽¹⁾ Includes perpetual securities

⁽²⁾ See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

⁽³⁾ Includes $6 of impairments

Net Effect on Shareholders' Equity of Unrealized Gains and Losses from Investment Securities

The net effect on shareholders’ equity of unrealized gains and losses from investment securities was as follows:

(In millions)	March 31, 2018				December 31, 2017
Unrealized gains (losses) on securities available for sale		$	7,426			$	9,358
Deferred income taxes		(2,220		)		(3,394		)
Shareholders’ equity, unrealized gains (losses) on investment securities		$	5,206			$	5,964

See Note 1 for discussion of the accounting treatment of tax on amounts recorded in accumulated other comprehensive income pursuant to the Tax Act and for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

Investments Gross Unrealized Loss Aging

The following tables show the fair values and gross unrealized losses of the Company's available-for-sale and held-to-maturity investments that were in an unrealized loss position, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.

	March 31, 2018
	Total						Less than 12 months						12 months or longer
(In millions)	Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value			Unrealized Losses
Fixed maturity securities: (1)
U.S. government and agencies:
U.S. dollar-denominated		$	79		$	1		$	71		$	1		$	8		$	0
Japan government and agencies:
Yen-denominated		4,054			192			128			0			3,926			192
Municipalities:
Yen-denominated		128			11			0			0			128			11
Mortgage- and asset- backed securities:
U.S. dollar-denominated		91			1			71			1			20			0
Public utilities:
U.S. dollar-denominated		1,649			107			1,095			52			554			55
Yen-denominated		90			4			0			0			90			4
Sovereign and supranational:
Yen-denominated		302			27			302			27			0			0
Banks/financial institutions:
U.S. dollar-denominated		685			34			596			28			89			6
Yen-denominated		1,467			89			645			14			822			75
Other corporate:
U.S. dollar-denominated		13,730			1,111			8,903			420			4,827			691
Yen-denominated		302			8			276			6			26			2
Total		$	22,577		$	1,585		$	12,087		$	549		$	10,490		$	1,036

⁽¹⁾ Includes perpetual securities

	December 31, 2017
	Total						Less than 12 months						12 months or longer
(In millions)	Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value			Unrealized Losses
Fixed maturity securities: (1)
U.S. government and agencies:
U.S. dollar-denominated		$	74		$	1		$	74		$	1		$	0		$	0
Japan government and agencies:
Yen-denominated		5,255			271			1,264			9			3,991			262
Municipalities:
Yen-denominated		129			12			10			0			119			12
Public utilities:
U.S. dollar-denominated		785			27			221			3			564			24
Yen-denominated		83			6			0			0			83			6
Sovereign and supranational:
Yen-denominated		309			1			309			1			0			0
Banks/financial institutions:
U.S. dollar-denominated		362			8			316			5			46			3
Yen-denominated		1,507			62			394			4			1,113			58
Other corporate:
U.S. dollar-denominated		7,741			418			2,839			50			4,902			368
Yen-denominated		440			7			349			4			91			3
Total		$	16,685		$	813		$	5,776		$	77		$	10,909		$	736

⁽¹⁾ Includes perpetual securities

Other Investments

The table below reflects the composition of the carrying value for other investments as of the periods presented.

(In millions)	March 31, 2018			December 31, 2017
Other investments:
Transitional real estate loans		$	2,719		$	1,235
Commercial mortgage loans		917			908
Middle market loans		957			859
Policy loans		227			210
Short-term investments		0			57
Other		253			133
Total other investments		$	5,073		$	3,402

Securities Lending Transactions Accounted for as Secured Borrowings

Details of the Company's securities lending activities were as follows:

Securities Lending Transactions Accounted for as Secured Borrowings
March 31, 2018
Remaining Contractual Maturity of the Agreements
(In millions)	Overnight and Continuous(1)		Up to 30 days		Total
Securities lending transactions:
Fixed maturity securities:
Japan government and agencies	$	0	$	4,894	$	4,894
Public utilities	30		0		30
Banks/financial institutions	52		0		52
Other corporate	384		0		384
Equity securities	8		0		8
Total borrowings	$	474	$	4,894	$	5,368
Gross amount of recognized liabilities for securities lending transactions					$	5,368
Amounts related to agreements not included in offsetting disclosure in Note 4					$	0

⁽¹⁾ These securities are pledged as collateral under the Company's U.S. securities lending program and can be called at its discretion; therefore, they are classified as Overnight and Continuous.

Securities Lending Transactions Accounted for as Secured Borrowings
December 31, 2017
Remaining Contractual Maturity of the Agreements
(In millions)	Overnight and Continuous(1)		Up to 30 days		Total
Securities lending transactions:
Fixed maturity securities:
Japan government and agencies	$	0	$	49	$	49
Public utilities	73		0		73
Banks/financial institutions	54		0		54
Other corporate	415		0		415
Equity securities	15		0		15
Total borrowings	$	557	$	49	$	606
Gross amount of recognized liabilities for securities lending transactions					$	606
Amounts related to agreements not included in offsetting disclosure in Note 4					$	0

⁽¹⁾ These securities are pledged as collateral under the Company's U.S. securities lending program and can be called at its discretion; therefore, they are classified as Overnight and Continuous.

Variable Interest Entity, Consolidated

Investments in Variable Interest Entities

VIEs - Consolidated

The following table presents the cost or amortized cost, fair value and balance sheet caption in which the assets and liabilities of consolidated VIEs are reported.

Investments in Consolidated Variable Interest Entities

	March 31, 2018						December 31, 2017
(In millions)	Cost or Amortized Cost			Fair Value			Cost or Amortized Cost			Fair Value
Assets:
Fixed maturity securities, available for sale (1)		$	4,695		$	5,431		$	4,538		$	5,509
Equity securities		760			760			606			753
Other investments (2)		3,994			3,974			2,341			2,328
Other assets (3)		241			241			151			151
Total assets of consolidated VIEs		$	9,690		$	10,406		$	7,636		$	8,741
Liabilities:
Other liabilities (3)		$	86		$	86		$	128		$	128
Total liabilities of consolidated VIEs		$	86		$	86		$	128		$	128

⁽¹⁾ Includes perpetual securities

⁽²⁾ Consists of TREs, CMLs, MMLs, and alternative investments in limited partnerships

⁽³⁾ Consists entirely of derivatives

Variable Interest Entity, Not Consolidated

Investments in Variable Interest Entities

VIEs-Not Consolidated

The table below reflects the amortized cost, fair value and balance sheet caption in which the Company's investment in VIEs not consolidated are reported.

Investments in Variable Interest Entities Not Consolidated

	March 31, 2018						December 31, 2017
(In millions)	Amortized Cost			Fair Value			Amortized Cost			Fair Value
Assets:
Fixed maturity securities, available for sale (1)		$	5,194		$	5,749		$	5,004		$	5,724
Fixed maturity securities, held to maturity		2,711			3,077			2,549			2,929
Other investments		110			108			55			55
Total investments in VIEs not consolidated		$	8,015		$	8,934		$	7,608		$	8,708

⁽¹⁾ Includes perpetual securities

XML

DERIVATIVE INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

		March 31, 2018										December 31, 2017
(In millions)				Asset Derivatives			Liability Derivatives							Asset Derivatives			Liability Derivatives
Hedge Designation/ Derivative Type	Notional Amount			Fair Value			Fair Value				Notional Amount			Fair Value			Fair Value
Cash flow hedges:
Foreign currency swaps		$	75		$	1		$	(2	)		$	75		$	0		$	(8	)
Total cash flow hedges		75			1			(2		)		75			0			(8		)
Fair value hedges:
Foreign currency forwards		5,550			244			(5		)		7,640			2			(221		)
Foreign currency options		9,120			0			(3		)		7,670			0			(2		)
Total fair value hedges		14,670			244			(8		)		15,310			2			(223		)
Net investment hedge:
Foreign currency forwards		0			0			0				5			0			0
Foreign currency options		0			0			0				434			12			(1		)
Total net investment hedge		0			0			0				439			12			(1		)
Non-qualifying strategies:
Foreign currency swaps		5,426			369			(263		)		5,386			296			(189		)
Foreign currency forwards		6,656			182			(80		)		3,683			20			(53		)
Foreign currency options		299			0			0				770			0			0
Credit default swaps		94			1			0				88			1			0
Total non-qualifying strategies		12,475			552			(343		)		9,927			317			(242		)
Total derivatives		$	27,220		$	797		$	(353	)		$	25,751		$	331		$	(474	)
Balance Sheet Location
Other assets		$	18,248		$	797		$	0			$	10,948		$	331		$	0
Other liabilities		8,972			0			(353		)		14,803			0			(474		)
Total derivatives		$	27,220		$	797		$	(353	)		$	25,751		$	331		$	(474	)

Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location

The following table presents the gains and losses on derivatives and the related hedged items in fair value hedges.

Fair Value Hedging Relationships

(In millions)		Hedging Derivatives								Hedged Items
Hedging Derivatives	Hedged Items	Total Gains (Losses)			Gains (Losses) Excluded from Effectiveness Testing			Gains (Losses) Included in Effectiveness Testing		Gains (Losses)			Ineffectiveness Recognized for Fair Value Hedge
Three Months Ended March 31, 2018:
Foreign currency forwards	Fixed maturity securities	$	414		$	(39	)	$	453	$	(464	)	$	(11	)
Foreign currency options	Fixed maturity securities	(1		)	(1		)	0		0			0
Three Months Ended March 31, 2017:
Foreign currency forwards	Fixed maturity and equity securities	$	341		$	(48	)	$	389	$	(372	)	$	17
Foreign currency options	Fixed maturity securities	24			13			11		(10		)	1

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance

The following table summarizes the impact to realized investment gains (losses) and other comprehensive income (loss) from all derivatives and hedging instruments.

	Three Months Ended March 31,
	2018								2017
(In millions)	Realized Investment Gains (Losses)				Other Comprehensive Income (Loss)(1)				Realized Investment Gains (Losses)				Other Comprehensive Income (Loss)(1)
Qualifying hedges:
Cash flow hedges:
Foreign currency swaps		$	1			$	6			$	0			$	2
Total cash flow hedges		1				6				0				2
Fair value hedges:
Foreign currency forwards(2)		(50		)		0				(31		)		0
Foreign currency options(2)		(1		)		0				14				0
Total fair value hedges		(51		)		0				(17		)		0
Net investment hedge:
Non-derivative hedging instruments		0				(84		)		0				(17		)
Foreign currency forwards		0				0				0				(9		)
Foreign currency options		0				(8		)		0				(23		)
Total net investment hedge		0				(92		)		0				(49		)
Non-qualifying strategies:
Foreign currency swaps		14				0				(8		)		0
Foreign currency forwards		179				0				(27		)		0
Foreign currency options		1				0				0				0
Total non-qualifying strategies		194				0				(35		)		0
Total		$	144			$	(86	)		$	(52	)		$	(47	)

⁽¹⁾ Cash flow hedge items are recorded as unrealized gains (losses) on derivatives and net investment hedge items are recorded in the unrealized foreign currency translation gains (losses) line in the consolidated statement of comprehensive income (loss).

⁽²⁾ Impact shown net of effect of hedged items (see Fair Value Hedges section of this Note 4 for further detail)

Fair Value and Notional Amount of Derivatives with Counterparty Credit Risk

The counterparties to these derivatives are financial institutions with the following credit ratings:

	March 31, 2018										December 31, 2017
(In millions)	Notional Amount of Derivatives			Asset Derivatives Fair Value			Liability Derivatives Fair Value				Notional Amount of Derivatives			Asset Derivatives Fair Value			Liability Derivatives Fair Value
Counterparties' credit rating:
AA		$	4,685		$	123		$	(12	)		$	4,708		$	52		$	(37	)
A		22,081			673			(290		)		20,604			271			(370		)
BBB		454			1			(51		)		439			8			(67		)
Total		$	27,220		$	797		$	(353	)		$	25,751		$	331		$	(474	)

Offsetting Assets

Offsetting of Financial Assets and Derivative Asset

March 31, 2018
										Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Assets			Gross Amount Offset in Balance Sheet			Net Amount of Assets Presented  in Balance Sheet			Financial Instruments				Securities Collateral			Cash Collateral Received				Net Amount
Derivative   assets:
Derivative       assets subject to a       master netting       agreement or       offsetting       arrangement		$	556		$	0		$	556		$	(116	)	$	(343	)		$	(67	)		$	30
Derivative       assets not subject       to a master netting       agreement or       offsetting       arrangement		241						241														241
Total derivative       assets		797			0			797			(116		)	(343		)		(67		)		271
Securities lending    and similar    arrangements		5,249			0			5,249			0			0				(5,249		)		0
Total		$	6,046		$	0		$	6,046		$	(116	)	$	(343	)		$	(5,316	)		$	271

December 31, 2017
										Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Assets			Gross Amount Offset in Balance Sheet			Net Amount of Assets Presented  in Balance Sheet			Financial Instruments				Securities Collateral		Cash Collateral Received				Net Amount
Derivative   assets:
Derivative       assets subject to a       master netting       agreement or       offsetting       arrangement		$	180		$	0		$	180		$	(82	)	$	0		$	(98	)		$	0
Derivative       assets not subject       to a master netting       agreement or       offsetting       arrangement		151						151													151
Total derivative       assets		331			0			331			(82		)	0			(98		)		151
Securities lending    and similar    arrangements		592			0			592			0			0			(592		)		0
Total		$	923		$	0		$	923		$	(82	)	$	0		$	(690	)		$	151

Offsetting Liabilities

Offsetting of Financial Liabilities and Derivative Liabilities

March 31, 2018
												Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Liabilities				Gross Amount Offset in Balance Sheet			Net Amount of Liabilities Presented  in Balance Sheet				Financial Instruments			Securities Collateral		Cash Collateral Pledged			Net Amount
Derivative   liabilities:
Derivative       liabilities subject       to a master netting       agreement or       offsetting       arrangement		$	(267	)		$	0		$	(267	)		$	116	$	36		$	113		$	(2	)
Derivative       liabilities not       subject to a       master netting       agreement or       offsetting       arrangement		(86		)					(86		)										(86		)
Total derivative       liabilities		(353		)		0			(353		)		116		36			113			(88		)
Securities lending    and similar    arrangements		(5,368		)		0			(5,368		)		5,249		0			0			(119		)
Total		$	(5,721	)		$	0		$	(5,721	)		$	5,365	$	36		$	113		$	(207	)

December 31, 2017
												Gross Amounts Not Offset in Balance Sheet
(In millions)	Gross Amount of Recognized Liabilities				Gross Amount Offset in Balance Sheet			Net Amount of Liabilities Presented  in Balance Sheet				Financial Instruments			Securities Collateral		Cash Collateral Pledged			Net Amount
Derivative   liabilities:
Derivative       liabilities subject       to a master netting       agreement or       offsetting       arrangement		$	(346	)		$	0		$	(346	)		$	82	$	245		$	10		$	(9	)
Derivative       liabilities not       subject to a       master netting       agreement or       offsetting       arrangement		(128		)					(128		)										(128		)
Total derivative       liabilities		(474		)		0			(474		)		82		245			10			(137		)
Securities lending    and similar    arrangements		(606		)		0			(606		)		592		0			0			(14		)
Total		$	(1,080	)		$	0		$	(1,080	)		$	674	$	245		$	10		$	(151	)

XML

FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Hierarchy, Assets and Liabilities Measured on Recurring Basis

The following tables present the fair value hierarchy levels of the Company's assets and liabilities that are measured and carried at fair value on a recurring basis.

	March 31, 2018
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities:(1)
Government and agencies		$	35,325		$	1,411		$	0		$	36,736
Municipalities		0			1,373			0			1,373
Mortgage- and asset-backed securities		0			269			186			455
Public utilities		0			7,724			83			7,807
Sovereign and supranational		0			1,866			0			1,866
Banks/financial institutions		0			9,120			24			9,144
Other corporate		0			31,509			143			31,652
Total fixed maturity securities		35,325			53,272			436			89,033		(1)
Equity securities (1)		1,015			77			16			1,108		(1)
Cash and cash equivalents		4,080			0			0			4,080
Other assets:
Foreign currency swaps		0			130			240			370
Foreign currency forwards		0			426			0			426
Credit default swaps		0			0			1			1
Total other assets		0			556			241			797
Total assets		$	40,420		$	53,905		$	693		$	95,018
Liabilities:
Other liabilities:
Foreign currency swaps		$	0		$	179		$	86		$	265
Foreign currency forwards		0			85			0			85
Foreign currency options		0			3			0			3
Total liabilities		$	0		$	267		$	86		$	353

⁽¹⁾ Includes perpetual securities

	December 31, 2017
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Government and agencies		$	30,109		$	1,121		$	0		$	31,230
Municipalities		0			1,370			0			1,370
Mortgage- and asset-backed securities		0			269			175			444
Public utilities		0			7,886			68			7,954
Sovereign and supranational		0			1,909			0			1,909
Banks/financial institutions		0			8,908			25			8,933
Other corporate		0			32,327			146			32,473
Total fixed maturity securities		30,109			53,790			414			84,313		(1)
Equity securities		1,001			6			16			1,023
Other investments		57			0			0			57
Cash and cash equivalents		3,491			0			0			3,491
Other assets:
Foreign currency swaps		0			146			150			296
Foreign currency forwards		0			22			0			22
Foreign currency options		0			12			0			12
Credit default swaps		0			0			1			1
Total other assets		0			180			151			331
Total assets		$	34,658		$	53,976		$	581		$	89,215
Liabilities:
Other liabilities:
Foreign currency swaps		$	0		$	69		$	128		$	197
Foreign currency forwards		0			274			0			274
Foreign currency options		0			3			0			3
Total liabilities		$	0		$	346		$	128		$	474

⁽¹⁾ Includes perpetual securities

Fair Value Hierarchy Levels of Assets and Liabilities Carried at Cost or Amortized Cost

The following tables present the carrying amount and fair value categorized by fair value hierarchy level for the Company's financial instruments that are not carried at fair value.

	March 31, 2018
(In millions)	Carrying Value			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies		$	22,686		$	28,317		$	0		$	0		$	28,317
Municipalities		379			0			493			0			493
Mortgage and asset-backed securities		26			0			9			19			28
Public utilities		3,508			0			3,891			0			3,891
Sovereign and supranational		1,620			0			1,919			0			1,919
Banks/financial institutions		2,300			0			2,477			0			2,477
Other corporate		2,858			0			3,343			0			3,343
Other investments (1)		4,608			0			15			4,575			4,590
Total assets		$	37,985		$	28,317		$	12,147		$	4,594		$	45,058
Liabilities:
Other policyholders’ funds		$	7,417		$	0		$	0		$	7,307		$	7,307
Notes payable (excluding capital leases)		5,352			0			5,146			281			5,427
Total liabilities		$	12,769		$	0		$	5,146		$	7,588		$	12,734

⁽¹⁾Excludes policy loans of $227 and equity method investments of $238, at carrying value

	December 31, 2017
(In millions)	Carrying Value			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Assets:
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies		$	21,331		$	26,491		$	0		$	0		$	26,491
Municipalities		357			0			462			0			462
Mortgage and asset-backed securities		26			0			8			19			27
Public utilities		3,300			0			3,698			0			3,698
Sovereign and supranational		1,523			0			1,835			0			1,835
Banks/financial institutions		2,206			0			2,387			0			2,387
Other corporate		2,687			0			3,172			0			3,172
Other investments (1)		3,017			0			15			2,987			3,002
Total assets		$	34,447		$	26,491		$	11,577		$	3,006		$	41,074
Liabilities:
Other policyholders’ funds		$	6,939		$	0		$	0		$	6,841		$	6,841
Notes payable (excluding capital leases)		5,267			0			5,288			265			5,553
Total liabilities		$	12,206		$	0		$	5,288		$	7,106		$	12,394

⁽¹⁾Excludes policy loans of $210 and equity method investments of $118, at carrying value

Fair Value Assets Securities Carried At Fair Value Primary Pricing Sources

The following tables present the pricing sources for the fair values of the Company's fixed maturity and equity securities.

	March 31, 2018
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Government and agencies:
Third party pricing vendor		$	35,325		$	1,411		$	0		$	36,736
Total government and agencies		35,325			1,411			0			36,736
Municipalities:
Third party pricing vendor		0			1,373			0			1,373
Total municipalities		0			1,373			0			1,373
Mortgage- and asset-backed securities:
Third party pricing vendor		0			269			0			269
Broker/other		0			0			186			186
Total mortgage- and asset-backed securities		0			269			186			455
Public utilities:
Third party pricing vendor		0			7,724			0			7,724
Broker/other		0			0			83			83
Total public utilities		0			7,724			83			7,807
Sovereign and supranational:
Third party pricing vendor		0			1,866			0			1,866
Total sovereign and supranational		0			1,866			0			1,866
Banks/financial institutions:
Third party pricing vendor		0			9,120			0			9,120
Broker/other		0			0			24			24
Total banks/financial institutions		0			9,120			24			9,144
Other corporate:
Third party pricing vendor		0			31,509			0			31,509
Broker/other		0			0			143			143
Total other corporate		0			31,509			143			31,652
Total securities available for sale		$	35,325		$	53,272		$	436		$	89,033	(1)
Equity securities, carried at fair value: (1)
Third party pricing vendor		$	1,015		$	77		$	0		$	1,092
Broker/other		0			0			16			16
Total equity securities		$	1,015		$	77		$	16		$	1,108	(1)

⁽¹⁾ Includes perpetual securities

	December 31, 2017
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities available for sale, carried at fair value:
Fixed maturity securities: (1)
Government and agencies:
Third party pricing vendor		$	30,109		$	1,121		$	0		$	31,230
Total government and agencies		30,109			1,121			0			31,230
Municipalities:
Third party pricing vendor		0			1,370			0			1,370
Total municipalities		0			1,370			0			1,370
Mortgage- and asset-backed securities:
Third party pricing vendor		0			269			0			269
Broker/other		0			0			175			175
Total mortgage- and asset-backed securities		0			269			175			444
Public utilities:
Third party pricing vendor		0			7,886			0			7,886
Broker/other		0			0			68			68
Total public utilities		0			7,886			68			7,954
Sovereign and supranational:
Third party pricing vendor		0			1,807			0			1,807
Broker/other		0			102			0			102
Total sovereign and supranational		0			1,909			0			1,909
Banks/financial institutions:
Third party pricing vendor		0			8,908			0			8,908
Broker/other		0			0			25			25
Total banks/financial institutions		0			8,908			25			8,933
Other corporate:
Third party pricing vendor		0			32,327			0			32,327
Broker/other		0			0			146			146
Total other corporate		0			32,327			146			32,473
Total securities available for sale		$	30,109		$	53,790		$	414		$	84,313	(1)
Equity securities, carried at fair value:
Third party pricing vendor		$	1,001		$	6		$	0		$	1,007
Broker/other		0			0			16			16
Total equity securities		$	1,001		$	6		$	16		$	1,023

⁽¹⁾ Includes perpetual securities

Fair Value Assets Held-To-Maturity Securities Primary Pricing Sources

	December 31, 2017
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies:
Third party pricing vendor		$	26,491		$	0		$	0		$	26,491
Total government and agencies		26,491			0			0			26,491
Municipalities:
Third party pricing vendor		0			462			0			462
Total municipalities		0			462			0			462
Mortgage- and asset-backed securities:
Third party pricing vendor		0			8			0			8
Broker/other		0			0			19			19
Total mortgage- and asset-backed securities		0			8			19			27
Public utilities:
Third party pricing vendor		0			3,698			0			3,698
Total public utilities		0			3,698			0			3,698
Sovereign and supranational:
Third party pricing vendor		0			1,835			0			1,835
Total sovereign and supranational		0			1,835			0			1,835
Banks/financial institutions:
Third party pricing vendor		0			2,387			0			2,387
Total banks/financial institutions		0			2,387			0			2,387
Other corporate:
Third party pricing vendor		0			3,172			0			3,172
Total other corporate		0			3,172			0			3,172
Total securities held to maturity		$	26,491		$	11,562		$	19		$	38,072

	March 31, 2018
(In millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total Fair Value
Securities held to maturity, carried at amortized cost:
Fixed maturity securities:
Government and agencies:
Third party pricing vendor		$	28,317		$	0		$	0		$	28,317
Total government and agencies		28,317			0			0			28,317
Municipalities:
Third party pricing vendor		0			493			0			493
Total municipalities		0			493			0			493
Mortgage- and asset-backed securities:
Third party pricing vendor		0			9			0			9
Broker/other		0			0			19			19
Total mortgage- and asset-backed securities		0			9			19			28
Public utilities:
Third party pricing vendor		0			3,891			0			3,891
Total public utilities		0			3,891			0			3,891
Sovereign and supranational:
Third party pricing vendor		0			1,919			0			1,919
Total sovereign and supranational		0			1,919			0			1,919
Banks/financial institutions:
Third party pricing vendor		0			2,477			0			2,477
Total banks/financial institutions		0			2,477			0			2,477
Other corporate:
Third party pricing vendor		0			3,343			0			3,343
Total other corporate		0			3,343			0			3,343
Total securities held to maturity		$	28,317		$	12,132		$	19		$	40,468

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

Transfers between Hierarchy Levels and Level 3 Rollforward

During the three-month periods ended March 31, 2018 and 2017, respectively, there were no transfers between Level 1 and 2 for assets and liabilities that are measured and carried at fair value on a recurring basis.

The following tables present the changes in fair value of the Company's investments and derivatives carried at fair value classified as Level 3.

Three Months Ended March 31, 2018
	Fixed Maturity Securities											Equity Securities		Derivatives (1)
(In millions)	Mortgage- and Asset- Backed Securities		Public Utilities			Banks/ Financial Institutions			Other Corporate					Foreign Currency Swaps		Credit Default Swaps		Total
Balance, beginning of period	$	175	$	68		$	25		$	146		$	16	$	22	$	1	$	453
Realized investment gains (losses) included in earnings	0		0			0			0			0		126		0		126
Unrealized gains (losses) included in other comprehensive income (loss)	11		(1		)	(1		)	(2		)	0		6		0		13
Purchases, issuances, sales and settlements:
Purchases	0		16			0			0			0		0		0		16
Issuances	0		0			0			0			0		0		0		0
Sales	0		0			0			0			0		0		0		0
Settlements	0		0			0			(1		)	0		0		0		(1		)
Transfers into Level 3	0		0			0			0			0		0		0		0
Transfers out of Level 3	0		0			0			0			0		0		0		0
Balance, end of period	$	186	$	83		$	24		$	143		$	16	$	154	$	1	$	607
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in realized investment gains (losses)	$	0	$	0		$	0		$	0		$	0	$	126	$	0	$	126

⁽¹⁾ Derivative assets and liabilities are presented net

Three Months Ended March 31, 2017
	Fixed Maturity Securities										Equity Securities			Derivatives (1)
(In millions)	Mortgage- and Asset- Backed Securities			Public Utilities		Banks/ Financial Institutions			Other Corporate					Foreign Currency Swaps			Credit Default Swaps		Total
Balance, beginning of period	$	198		$	16	$	25		$	0	$	3		$	(21	)	$	2	$	223
Realized investment gains (losses) included    in earnings	0			0		0			0		0			38			0		38
Unrealized gains (losses) included in other    comprehensive income (loss)	6			0		(1		)	0		0			2			0		7
Purchases, issuances, sales and settlements:
Purchases	0			0		0			35		2			0			0		37
Issuances	0			0		0			0		0			0			0		0
Sales	0			0		0			0		(1		)	0			0		(1		)
Settlements	(9		)	0		0			0		0			0			0		(9		)
Transfers into Level 3	0			0		0			0		0			0			0		0
Transfers out of Level 3	0			0		0			0		0			0			0		0
Balance, end of period	$	195		$	16	$	24		$	35	$	4		$	19		$	2	$	295
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in realized investment gains (losses)	$	0		$	0	$	0		$	0	$	0		$	38		$	0	$	38

⁽¹⁾ Derivative assets and liabilities are presented net

Fair Value Inputs, Assets, Quantitative Information

December 31, 2017
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities:
Mortgage- and asset-backed securities		$	175	Consensus pricing	Offered quotes	N/A	(c)
Public utilities		68		Discounted cash flow	Credit spreads	N/A	(c)
Banks/financial institutions		25		Consensus pricing	Offered quotes	N/A	(c)
Other corporate		146		Discounted cash flow	Credit spreads	N/A	(c)
Equity securities		16		Net asset value	Offered quotes	N/A	(c)
Other assets:
Foreign currency swaps		80		Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	9 - 90 bps
		70		Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Credit default swaps		1		Discounted cash flow	Base correlation	46.33% - 49.65%	(d)
					CDS spreads	25 bps
					Recovery rate	37.24%
Total assets		$	581

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

(c) N/A represents securities where the Company receives unadjusted broker quotes and for which there is no transparency into the providers' valuation techniques or unobservable inputs.

(d) Range of base correlation for the Company's bespoke tranche for attachment and detachment points corresponding to market indices

The following tables summarize the significant unobservable inputs used in the valuation of the Company's Level 3 investments and derivatives carried at fair value. Included in the tables are the inputs or range of possible inputs that have an effect on the overall valuation of the financial instruments.

March 31, 2018
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Assets:
Securities available for sale, carried at fair value:
Fixed maturity securities:
Mortgage- and asset-backed securities		$	186	Consensus pricing	Offered quotes	N/A	(c)
Public utilities		83		Discounted cash flow	Credit spreads	N/A	(c)
Banks/financial institutions		24		Consensus pricing	Offered quotes	N/A	(c)
Other corporate		143		Discounted cash flow	Credit spreads	N/A	(c)
Equity securities		16		Net asset value	Offered quotes	N/A	(c)
Other assets:
Foreign currency swaps		185		Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	13 - 101 bps
		55		Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Credit default swaps		1		Discounted cash flow	Base correlation	49.98% - 54.13%	(d)
					CDS spreads	15 bps
					Recovery rate	37.24%
Total assets		$	693

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

(c) N/A represents securities where the Company receives unadjusted broker quotes and for which there is no transparency into the providers' valuation techniques or unobservable inputs.

(d) Range of base correlation for the Company's bespoke tranche for attachment and detachment points corresponding to market indices

Fair Value Inputs, Liabilities, Quantitative Information

December 31, 2017
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Liabilities:
Other liabilities:
Foreign currency swaps		$	120	Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	13 - 157 bps
		8		Discounted cash flow	Interest rates (USD)	2.40% - 2.54%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Total liabilities		$	128

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

March 31, 2018
(In millions)	Fair Value			Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Liabilities:
Other liabilities:
Foreign currency swaps		$	84	Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
					CDS spreads	17 - 170 bps
		2		Discounted cash flow	Interest rates (USD)	2.78% - 2.82%	(a)
					Interest rates (JPY)	.26% - .85%	(b)
Total liabilities		$	86

(a) Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

(b) Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swap

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POLICY LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2018

Insurance Loss Reserves [Abstract]

Schedule of Liability for Unpaid Claims Adjustment Expense

Changes in the liability for unpaid policy claims were as follows:

	Three Months Ended March 31,
(In millions)		2018			2017
Unpaid supplemental health claims, beginning of period		$	3,884		$	3,707
Less reinsurance recoverables		30			27
Net balance, beginning of period		3,854			3,680
Add claims incurred during the period related to:
Current year		1,842			1,737
Prior years		(192		)	(111		)
Total incurred		1,650			1,626
Less claims paid during the period on claims incurred during:
Current year		518			505
Prior years		1,116			1,055
Total paid		1,634			1,560
Effect of foreign exchange rate changes on unpaid claims		142			80
Net balance, end of period		4,012			3,826
Add reinsurance recoverables		31			29
Unpaid supplemental health claims, end of period		4,043			3,855
Unpaid life claims, end of period		587			375
Total liability for unpaid policy claims		$	4,630		$	4,230

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REINSURANCE (Tables)

3 Months Ended

Mar. 31, 2018

Reinsurance Disclosures [Abstract]

Effects of Reinsurance

The following table reconciles direct premium income and direct benefits and claims to net amounts after the effect of reinsurance.

	Three Months Ended March 31,
(In millions)	2018				2017
Direct premium income		$	4,833			$	4,724
Ceded to other companies:
Ceded Aflac Japan closed blocks		(129		)		(130		)
Other		(15		)		(12		)
Assumed from other companies:
Retrocession activities		54				54
Other		2				2
Net premium income		$	4,745			$	4,638
Direct benefits and claims		$	3,119			$	3,129
Ceded benefits and change in reserves for future benefits:
Ceded Aflac Japan closed blocks		(117		)		(122		)
Eliminations		12				13
Other		(12		)		(11		)
Assumed from other companies:
Retrocession activities		52				54
Eliminations		(12		)		(13		)
Other		0				2
Benefits and claims, net		$	3,042			$	3,052

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NOTES PAYABLE (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

A summary of notes payable follows:

(In millions)	March 31, 2018			December 31, 2017
2.40% senior notes due March 2020		$	548		$	548
4.00% senior notes due February 2022		348			348
3.625% senior notes due June 2023		697			697
3.625% senior notes due November 2024		746			745
3.25% senior notes due March 2025		446			446
2.875% senior notes due October 2026		297			297
6.90% senior notes due December 2039		220			220
6.45% senior notes due August 2040		254			254
4.00% senior notes due October 2046		394			394
Yen-denominated senior notes and subordinated debentures:
.932% senior notes due January 2027 (principal amount 60.0 billion yen)		562			528
2.108% subordinated debentures due October 2047 (principal amount 60.0 billion yen)		559			526
Yen-denominated loans:
Variable interest rate loan due September 2021 (.32% in 2018 and 2017, principal amount 5.0 billion yen)		47			44
Variable interest rate loan due September 2023 (.47% in 2018 and 2017, principal amount 25.0 billion yen)		234			220
Capitalized lease obligations payable through 2025		20			22
Total notes payable		$	5,372		$	5,289

Amounts in the table above are reported net of debt issuance costs and issuance premiums or discounts, if applicable, that are being amortized over the life of the notes.

Schedule of Line of Credit Facilities

A summary of the Company's lines of credit as of March 31, 2018 follows:

Borrower	Type	Original Term	Expiration Date	Capacity	Amount Outstanding	Interest Rate on Borrowed Amount	Maturity Period	Commitment Fee	Business Purpose
Aflac Incorporated and Aflac	uncommitted bilateral	364 days	November 30, 2018	$100 million	$0 million	The rate quoted by the bank and agreed upon at the time of borrowing	Up to 3 months	None	General corporate purposes
Aflac Incorporated	unsecured revolving	3 years	March 31, 2019, or the date commitments are terminated pursuant to an event of default	100.0 billion yen	0.0 billion yen	A rate per annum equal to (a) Tokyo interbank market rate (TIBOR) plus, the alternative applicable TIBOR margin during the availability period from the closing date to the commitment termination date or (b) the TIBOR rate offered by the agent to major banks in yen for the applicable period plus, the applicable alternative TIBOR margin during the term out period	No later than March 31, 2019	.30% to .50%, depending on the Parent Company's debt ratings as of the date of determination	General corporate purposes, including a capital contingency plan for the operations of the Parent Company
Aflac Incorporated and Aflac	unsecured revolving	5 years	September 18, 2020, or the date commitments are terminated pursuant to an event of default(1)	55.0 billion yen, or the equivalent amount in U.S. dollars	0.0 billion yen	A rate per annum equal to, at the Company's option, either, (a) London Interbank Offered Rate (LIBOR) adjusted for certain costs or (b) a base rate determined by reference to the highest of (1) the federal funds rate plus 1/2 of 1%, (2) the rate of interest for such day announced by Mizuho Bank, Ltd. as its prime rate, or (3) the eurocurrency rate for an interest period of one month plus 1.00%, in each case plus an applicable margin	No later than September 18, 2020(1)	.085% to .225%, depending on the Parent Company's debt ratings as of the date of determination	General corporate purposes, including a capital contingency plan for the operations of the Parent Company
Aflac Incorporated and Aflac	uncommitted bilateral	None specified	None specified	$50 million	$0 million	A rate per annum equal to, at the Parent Company's option, either (a) a eurocurrency rate determined by reference to the agent's LIBOR for the interest period relevant to such borrowing or (b) the base rate determined by reference to the greater of (i) the prime rate as determined by the agent, and (ii) the sum of 0.50% and the federal funds rate for such day	Up to 3 months	None	General corporate purposes
Aflac(2)	uncommitted revolving	364 days	November 30, 2018	$250 million	$0 million	USD three-month LIBOR plus 75 basis points per annum	3 months	None	General corporate purposes
Aflac Incorporated(2)	uncommitted revolving	364 days	April 2, 2018	37.5 billion yen	0.0 billion yen	Three-month TIBOR plus 80 basis points per annum	3 months	None	General corporate purposes

⁽¹⁾ Expiration and maturity period dates were updated in April 2018 to April 4, 2023

⁽²⁾Intercompany credit agreement

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SHAREHOLDERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Schedule of Common Stock Outstanding Roll Forward

The following table is a reconciliation of the number of shares of the Company's common stock for the three-month periods ended March 31.

(In thousands of shares)	2018		2017
Common stock - issued:
Balance, beginning of period	1,345,762		1,342,498
Exercise of stock options and issuance of restricted shares	1,014		868
Balance, end of period	1,346,776		1,343,366
Treasury stock:
Balance, beginning of period	564,852		530,877
Purchases of treasury stock:
Open market	6,640		16,986
Other	315		288
Dispositions of treasury stock:
Shares issued to AFL Stock Plan	(384	)	(494	)
Exercise of stock options	(305	)	(256	)
Other	(99	)	(40	)
Balance, end of period	571,019		547,361
Shares outstanding, end of period	775,757		796,005

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table presents the approximate number of share-based awards to purchase shares, on a weighted-average basis, that were considered to be anti-dilutive and were excluded from the calculation of diluted earnings per share for the following periods.

	Three Months Ended March 31,
(In thousands)	2018		2017
Anti-dilutive share-based awards		9		642

Schedule of Accumulated Other Comprehensive Income (Loss)

Reclassifications from Accumulated Other Comprehensive Income

The tables below are reconciliations of accumulated other comprehensive income by component for the following periods.

Changes in Accumulated Other Comprehensive Income

Three Months Ended March 31, 2018
(In millions)	Unrealized Foreign Currency Translation Gains (Losses)				Unrealized Gains (Losses) on Investment Securities					Unrealized Gains (Losses) on Derivatives				Pension Liability Adjustment				Total
Balance, beginning of period		$	(1,750	)		$	5,964				$	(23	)		$	(163	)		$	4,028
Other comprehensive income (loss) before reclassification		447				(983		)			2				(37		)		(571		)
Amounts reclassified from accumulated other comprehensive income (loss)		0				225			(1)		0				3				228
Net current-period other comprehensive income (loss)		447				(758		)			2				(34		)		(343		)
Balance, end of period		$	(1,303	)		$	5,206				$	(21	)		$	(197	)		$	3,685

⁽¹⁾ Includes amounts reclassified due to changes in accounting principles of $(148) related to financial instruments and $374 related to tax effects from tax reform

All amounts in the table above are net of tax.

Three Months Ended March 31, 2017
(In millions)	Unrealized Foreign Currency Translation Gains (Losses)				Unrealized Gains (Losses) on Investment Securities				Unrealized Gains (Losses) on Derivatives				Pension Liability Adjustment				Total
Balance, beginning of period		$	(1,983	)		$	4,805			$	(24	)		$	(168	)		$	2,630
Other comprehensive income (loss) before reclassification		333				(341		)		2				(4		)		(10		)
Amounts reclassified from accumulated other comprehensive income (loss)		0				10				0				2				12
Net current-period other comprehensive income (loss)		333				(331		)		2				(2		)		2
Balance, end of period		$	(1,650	)		$	4,474			$	(22	)		$	(170	)		$	2,632

All amounts in the table above are net of tax.

Reclassification Out Of Accumulated Other Comprehensive Income

The tables below summarize the amounts reclassified from each component of accumulated other comprehensive income into net earnings for the following periods.

Reclassifications Out of Accumulated Other Comprehensive Income

(In millions)	Three Months Ended March 31, 2018
Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income				Affected Line Item in the Statements of Earnings
Unrealized gains (losses) on available-for-sale securities		$	2		Sales and redemptions
		0			Other-than-temporary impairment losses realized
		2			Total before tax
		(1		)	Tax (expense) or benefit(1)
		$	1		Net of tax
Amortization of defined benefit pension items:
Actuarial gains (losses)		$	(4	)	Acquisition and operating expenses(2)
Prior service (cost) credit		0			Acquisition and operating expenses(2)
		1			Tax (expense) or benefit(1)
		$	(3	)	Net of tax
Total reclassifications for the period		$	(2	)	Net of tax

⁽¹⁾ Based on 27% blended tax rate

⁽²⁾ These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 12 for additional details).

(In millions)	Three Months Ended March 31, 2017
Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income				Affected Line Item in the Statements of Earnings
Unrealized gains (losses) on available-for-sale securities		$	(6	)	Sales and redemptions
		(10		)	Other-than-temporary impairment losses realized
		(16		)	Total before tax
		6			Tax (expense) or benefit(1)
		$	(10	)	Net of tax
Amortization of defined benefit pension items:
Actuarial gains (losses)		$	(3	)	Acquisition and operating expenses(2)
Prior service (cost) credit		0			Acquisition and operating expenses(2)
		1			Tax (expense) or benefit(1)
		$	(2	)	Net of tax
Total reclassifications for the period		$	(12	)	Net of tax

⁽¹⁾ Based on 35% tax rate

⁽²⁾ These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 12 for additional details)

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SHARE-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Options Outstanding and Exercisable

The following table provides information on stock options outstanding and exercisable at March 31, 2018.

	Stock Option Shares (in thousands)		Weighted-Average Remaining Term (in years)		Aggregate Intrinsic Value (in millions)			Weighted-Average Exercise Price Per Share
Outstanding		6,306		5.5		$	99		$	28.03
Exercisable		4,439		4.4		77			26.45

Schedule of Nonvested Restricted Stock Units Activity

The following table summarizes restricted stock activity during the three-month period ended March 31.

(In thousands of shares)	Shares		Weighted-Average Grant-Date Fair Value Per Share
Restricted stock at December 31, 2017	3,635			$	32.40
Granted in 2018	918			44.12
Canceled in 2018	(56	)		33.18
Vested in 2018	(980	)		31.50
Restricted stock at March 31, 2018	3,517			$	35.70

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BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2018

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Schedule of Net Benefit Costs

Pension and other postretirement benefit expenses are included in acquisition and operating expenses in the consolidated statement of earnings, which includes $5 million of other components of net periodic pension cost and postretirement costs (other than service costs) for the three months ended March 31, 2018 and 2017, respectively. Total net periodic cost includes the following components:

	Three Months Ended March 31,
	Pension Benefits																Other
	Japan								U.S.								Postretirement Benefits
(In millions)	2018				2017				2018				2017				2018			2017
Components of net periodic benefit cost:
Service cost		$	5			$	5			$	7			$	6			$	0		$	0
Interest cost		2				1				9				8				0			0
Expected return on plan assets		(2		)		(1		)		(7		)		(6		)		0			0
Amortization of net actuarial loss		0				0				4				3				0			0
Amortization of prior service cost (credit)		0				0				0				0				0			0
Net periodic (benefit) cost		$	5			$	5			$	13			$	11			$	0		$	0

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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions			3 Months Ended
		Feb. 13, 2018	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Stock Split, Conversion Ratio		2
Common stock as a percentage of two-for-one stock split dividend		100.00%
Aflac Japan
Significant Accounting Policies [Line Items]
Percentage of the Company's total assets			85.00%		83.00%
Percentage of the Company's total revenues			71.00%	69.00%
Upper Limit | Accounting Standards Update 2016-02
Significant Accounting Policies [Line Items]
Estimation of Percent of Leases Within Scope of the Guidance to Total Assets			1.00%
Accumulated other comprehensive income (loss): | Accounting Standards Update 2016-01
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principle, net of income taxes	[1]		$ (148)	$ 0
Accumulated other comprehensive income (loss): | Accounting Standards Update 2018-02
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principle, net of income taxes	[1]		374	0
Retained earnings | Accounting Standards Update 2016-01
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principle, net of income taxes	[1]		148	0
Retained earnings | Accounting Standards Update 2018-02
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principle, net of income taxes	[1]		$ (374)	$ 0

[1] See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018.

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BUSINESS SEGMENT INFORMATION - Operations by Segment - Revenues (Details) $ in Millions		3 Months Ended
		Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of Reportable Insurance Business Segments | segment		2
Net earned premiums		$ 4,745	$ 4,638
Net investment income		837	794
Total adjusted revenues		5,546	5,397
Realized investment gains (losses)	[1],[2]	(82)	(88)
Total revenues		5,464	5,309
Gain (loss) on change in fair value of derivative, corporate		2
Aflac Japan
Segment Reporting, Revenue Reconciling Item [Line Items]
Net earned premiums		3,263	3,194
Net investment income, less amortized hedge costs	[2]	588	557
Other income (loss)		12	10
Total revenues		3,863	3,761
Hedge costs		55	52
Aflac U.S.
Segment Reporting, Revenue Reconciling Item [Line Items]
Net earned premiums		1,427	1,390
Net investment income		175	178
Other income (loss)		2	1
Total revenues		1,604	1,569
Corporate and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	$ 79	$ 67

[1] Amortized hedge costs in Aflac Japan were offset by derivatives entered into as part of corporate activities and resulted in a benefit of $2 for the three-month period ended March 31, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in net investment income when analyzing operations.

[2] Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $52 for the three-month periods ended March 31, 2018, and 2017, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from net investment income when analyzing segment operations.

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BUSINESS SEGMENT INFORMATION - Operations by Segment - Pretax Earnings (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]
Pretax adjusted earnings		$ 1,109	$ 1,027
Realized investment gains (losses)	[1],[2],[3]	(98)	(109)
Other income (loss)		(29)	(20)
Earnings before income taxes		982	898
Income taxes applicable to pretax adjusted earnings		289	351
Effect of foreign currency translation on after tax adjusted earnings		21	5
Gain (loss) on change in fair value of derivative, corporate		2
Gain (loss) on change in fair value of derivative, interest rate component		17	21
Aflac Japan
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]
Pretax adjusted earnings	[2]	818	769
Hedge costs		55	52
Aflac U.S.
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]
Pretax adjusted earnings		337	310
Corporate and other
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]
Pretax adjusted earnings	[1]	$ (46)	$ (52)

[1] Amortized hedge costs in Aflac Japan were offset by derivatives entered into as part of corporate activities and resulted in a benefit of $2 for the three-month period ended March 31, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in pretax adjusted earnings when analyzing operations.

[2] Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $52 for the three-month periods ended March 31, 2018, and 2017, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from pretax adjusted earnings when analyzing segment operations.

[3] Excluding a gain of $17 and $21 for the three-month periods ended March 31, 2018, and 2017, respectively, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable which is included in adjusted earnings when analyzing segment operations

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BUSINESS SEGMENT INFORMATION - Operations by Segment - Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 147,356	$ 137,217
Aflac Japan
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	125,174	114,402
Aflac U.S.
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	19,706	19,893
Corporate and other
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 2,476	$ 2,922

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INVESTMENTS - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		$ 81,607	[1]	$ 75,132	[2]
Gross Unrealized Gains		8,998		9,985
Gross Unrealized Losses		1,572		804
Fair Value	[3]	89,033	[1]	84,313	[2]
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value				1,023
Perpetual Securities, Fair Value		71
Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	[3]	89,033		84,313
Perpetual Securities, Amortized Cost		1,506		1,462
Perpetual Securities, Fair Value		1,774		1,789
Yen-denominated | Equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value				695
Yen-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		46,154		40,378
Gross Unrealized Gains		5,964		5,582
Gross Unrealized Losses		318		350
Fair Value		51,800		45,610
Dollar-denominated | Equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value				328
Dollar-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		35,453		34,754
Gross Unrealized Gains		3,034		4,403
Gross Unrealized Losses		1,254		454
Fair Value		37,233		38,703
Japan government and agencies | Yen-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		32,961		27,980
Gross Unrealized Gains		3,811		3,363
Gross Unrealized Losses		192		271
Fair Value		36,580		31,072
Municipalities | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		1,373		1,370
Municipalities | Yen-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		350		314
Gross Unrealized Gains		33		28
Gross Unrealized Losses		11		12
Fair Value		372		330
Municipalities | Dollar-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		866		872
Gross Unrealized Gains		135		168
Gross Unrealized Losses		0		0
Fair Value		1,001		1,040
Mortgage- and asset-backed securities | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		455		444
Mortgage- and asset-backed securities | Yen-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		254		242
Gross Unrealized Gains		30		29
Gross Unrealized Losses		0		0
Fair Value		284		271
Mortgage- and asset-backed securities | Dollar-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		165		161
Gross Unrealized Gains		7		12
Gross Unrealized Losses		1		0
Fair Value		171		173
Public utilities | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		7,807		7,954
Public utilities | Yen-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		1,739		1,635
Gross Unrealized Gains		325		352
Gross Unrealized Losses		4		6
Fair Value		2,060		1,981
Public utilities | Dollar-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		5,223		5,116
Gross Unrealized Gains		631		884
Gross Unrealized Losses		107		27
Fair Value		5,747		5,973
Sovereign and supranational | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		1,866		1,909
Sovereign and supranational | Yen-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		1,348		1,380
Gross Unrealized Gains		212		190
Gross Unrealized Losses		27		1
Fair Value		1,533		1,569
Sovereign and supranational | Dollar-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		274		267
Gross Unrealized Gains		59		73
Gross Unrealized Losses		0		0
Fair Value		333		340
Banks/financial institutions | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		9,144		8,933
Banks/financial institutions | Yen-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		5,157		4,742
Gross Unrealized Gains		799		811
Gross Unrealized Losses		76		53
Fair Value		5,880		5,500
Banks/financial institutions | Dollar-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		2,841		2,808
Gross Unrealized Gains		457		633
Gross Unrealized Losses		34		8
Fair Value		3,264		3,433
Other corporate | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		31,652		32,473
Other corporate | Yen-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		4,345		4,085
Gross Unrealized Gains		754		809
Gross Unrealized Losses		8		7
Fair Value		5,091		4,887
Other corporate | Dollar-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		25,936		25,384
Gross Unrealized Gains		1,736		2,620
Gross Unrealized Losses		1,111		418
Fair Value		26,561		27,586
U.S. government and agencies | Dollar-denominated | Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		148		146
Gross Unrealized Gains		9		13
Gross Unrealized Losses		1		1
Fair Value		$ 156		$ 158

[1] Includes perpetual securities ($1,506 at amortized cost and $1,774 at fair value)

[2] Includes perpetual securities ($1,462 at amortized cost and $1,789 at fair value)

[3] Includes perpetual securities

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INVESTMENTS - Held-to-Maturity Investments in Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	$ 33,377	$ 31,430
Gross Unrealized Gains	7,104	6,651
Gross Unrealized Losses	13	9
Fair Value	40,468	38,072
Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Fair Value	40,468	38,072
Yen-denominated | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	33,377	31,430
Gross Unrealized Gains	7,104	6,651
Gross Unrealized Losses	13	9
Fair Value	40,468	38,072
Japan government and agencies | Yen-denominated | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	22,686	21,331
Gross Unrealized Gains	5,631	5,160
Gross Unrealized Losses	0	0
Fair Value	28,317	26,491
Municipalities | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	379	357
Fair Value	493	462
Municipalities | Yen-denominated | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	379	357
Gross Unrealized Gains	114	105
Gross Unrealized Losses	0	0
Fair Value	493	462
Mortgage- and asset-backed securities | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	26	26
Fair Value	28	27
Mortgage- and asset-backed securities | Yen-denominated | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	26	26
Gross Unrealized Gains	2	1
Gross Unrealized Losses	0	0
Fair Value	28	27
Public utilities | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	3,508	3,300
Fair Value	3,891	3,698
Public utilities | Yen-denominated | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	3,508	3,300
Gross Unrealized Gains	383	398
Gross Unrealized Losses	0	0
Fair Value	3,891	3,698
Sovereign and supranational | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	1,620	1,523
Fair Value	1,919	1,835
Sovereign and supranational | Yen-denominated | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	1,620	1,523
Gross Unrealized Gains	299	312
Gross Unrealized Losses	0	0
Fair Value	1,919	1,835
Banks/financial institutions | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	2,300	2,206
Fair Value	2,477	2,387
Banks/financial institutions | Yen-denominated | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	2,300	2,206
Gross Unrealized Gains	190	190
Gross Unrealized Losses	13	9
Fair Value	2,477	2,387
Other corporate | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	2,858	2,687
Fair Value	3,343	3,172
Other corporate | Yen-denominated | Fixed maturities
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, fixed maturities, amortized cost	2,858	2,687
Gross Unrealized Gains	485	485
Gross Unrealized Losses	0	0
Fair Value	$ 3,343	$ 3,172

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INVESTMENTS - Equity Securities, FV-NI (Details) $ in Millions	Mar. 31, 2018 USD ($)
Equity Securities, FV-NI [Line Items]
Fair Value	$ 1,108	[1],[2]
Yen-denominated
Equity Securities, FV-NI [Line Items]
Fair Value	711
Dollar-denominated
Equity Securities, FV-NI [Line Items]
Fair Value	397
Equity securities
Equity Securities, FV-NI [Line Items]
Perpetual Securities, Fair Value	$ 71

[1] Includes perpetual securities

[2] Includes perpetual securities ($71 at fair value)

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INVESTMENTS - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) investment	Mar. 31, 2017 investment	Dec. 31, 2017 USD ($)
Schedule of Investments [Line Items]
Equity securities, FV-NI, unrealized gain (loss)	$ (43)
Held to maturity securities transferred to available for sale securities, number of investments | investment	0	0
Middle market loan program unfunded amount	$ 76		$ 109
Middle market loan commitments	$ 985
Percentage that the lending policy requires that the fair value of the securities and/or unrestricted cash received as collateral be of the fair value of the loaned securities	102.00%
Allowance for loan loss	$ 18		$ 11
Transitional real estate loan commitments	436
Commercial mortgage loan commitments	54
Limited partnerships investment commitments	$ 763

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INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Available for sale:
Due in one year or less	[1]	$ 485
Due after one year through five years	[1]	9,685
Due after five years through 10 years	[1]	10,637
Due after 10 years	[1]	60,381
Mortgage- and asset-backed securities	[1]	419
Total fixed maturity securities, available for sale, amortized cost	[1]	81,607
Held to maturity:
Due in one year or less		1,036
Due after one year through five years		508
Due after five years through 10 years		1,597
Due after 10 years		30,210
Mortgage- and asset-backed securities		26
Total fixed maturity securities, held to maturity, amortized cost		33,377	$ 31,430
Available for sale:
Due in one year or less	[1]	502
Due after one year through five years	[1]	9,551
Due after five years through 10 years	[1]	11,143
Due after 10 years	[1]	67,382
Mortgage- and asset-backed securities	[1]	455
Total fixed maturity securities, available for sale, fair value	[1]	89,033
Held to maturity:
Due in one year or less		1,049
Due after one year through five years		527
Due after five years through 10 years		1,754
Due after 10 years		37,110
Mortgage- and asset-backed securities		28
Total fixed maturity securities, held to maturity, fair value		$ 40,468	$ 38,072

[1] Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)

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INVESTMENTS - Investment Exposures Individually Exceeded 10% of Shareholders' Equity (Details) - Japan National Government - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Summary of Investment Holdings [Line Items]
Credit Rating	[1]	A	A
Amortized Cost	[1]	$ 54,465	$ 48,399
Fair Value	[1]	$ 63,576	$ 56,532

[1] Japan Government Bonds (JGBs) or JGB-backed securities

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INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized		$ (7)	$ (10)
Loan loss reserves		(7)	(1)
Derivative gains (losses)		144	(52)
Foreign currency gains (losses)		(228)	(71)
Total realized investment gains (losses)		(134)	(140)
Derivatives and other
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(84)	(123)
Equity securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized			(6)
Total realized investment gains (losses)	[1],[2]	(46)	19
Available-for-sale securities | Fixed maturities
Gain (Loss) on Investments [Line Items]
Gross gains from sales	[3]	9	12
Gross losses from sales	[3]	(4)	(15)
Net gains (losses) from redemptions	[3]	(2)	(28)
Other-than-temporary impairment losses realized	[3]	0	(4)
Total realized investment gains (losses)	[3]	$ 3	$ (35)

[1] Includes $6 of impairments

[2] See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

[3] Includes perpetual securities

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INVESTMENTS - Net Effect on Shareholders' Equity of Unrealized Gains and Losses from Investment Securities (Detail) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Investments [Abstract]
Unrealized Gains (Losses) on Available-for-sale Securities	[1]	$ 7,426	$ 9,358
Deferred income taxes	[1]	(2,220)	(3,394)
Shareholders' equity, unrealized gains (losses) on investment securities	[1],[2]	$ 5,206	$ 5,964

[1] See Note 1 for discussion of the accounting treatment of tax on amounts recorded in accumulated other comprehensive income pursuant to the Tax Act and for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

[2] See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

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INVESTMENTS - Fair Value and Gross Unrealized Losses for Securities That Have Been in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	$ 22,577	$ 16,685
Total Unrealized Losses	[1]	1,585	813
Less than 12 months Fair Value	[1]	12,087	5,776
Less than 12 months Unrealized Losses	[1]	549	77
12 months or longer Fair Value	[1]	10,490	10,909
12 months or longer Unrealized Losses	[1]	1,036	736
Dollar-denominated | Fixed maturities | U.S. government and agencies
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	79	74
Total Unrealized Losses	[1]	1	1
Less than 12 months Fair Value	[1]	71	74
Less than 12 months Unrealized Losses	[1]	1	1
12 months or longer Fair Value	[1]	8	0
12 months or longer Unrealized Losses	[1]	0	0
Dollar-denominated | Fixed maturities | Mortgage- and asset-backed securities
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	91
Total Unrealized Losses	[1]	1
Less than 12 months Fair Value	[1]	71
Less than 12 months Unrealized Losses	[1]	1
12 months or longer Fair Value	[1]	20
12 months or longer Unrealized Losses	[1]	0
Dollar-denominated | Fixed maturities | Public utilities
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	1,649	785
Total Unrealized Losses	[1]	107	27
Less than 12 months Fair Value	[1]	1,095	221
Less than 12 months Unrealized Losses	[1]	52	3
12 months or longer Fair Value	[1]	554	564
12 months or longer Unrealized Losses	[1]	55	24
Dollar-denominated | Fixed maturities | Banks/financial institutions
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	685	362
Total Unrealized Losses	[1]	34	8
Less than 12 months Fair Value	[1]	596	316
Less than 12 months Unrealized Losses	[1]	28	5
12 months or longer Fair Value	[1]	89	46
12 months or longer Unrealized Losses	[1]	6	3
Dollar-denominated | Fixed maturities | Other corporate
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	13,730	7,741
Total Unrealized Losses	[1]	1,111	418
Less than 12 months Fair Value	[1]	8,903	2,839
Less than 12 months Unrealized Losses	[1]	420	50
12 months or longer Fair Value	[1]	4,827	4,902
12 months or longer Unrealized Losses	[1]	691	368
Yen-denominated | Fixed maturities | Japan government and agencies
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	4,054	5,255
Total Unrealized Losses	[1]	192	271
Less than 12 months Fair Value	[1]	128	1,264
Less than 12 months Unrealized Losses	[1]	0	9
12 months or longer Fair Value	[1]	3,926	3,991
12 months or longer Unrealized Losses	[1]	192	262
Yen-denominated | Fixed maturities | Municipalities
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	128	129
Total Unrealized Losses	[1]	11	12
Less than 12 months Fair Value	[1]	0	10
Less than 12 months Unrealized Losses	[1]	0	0
12 months or longer Fair Value	[1]	128	119
12 months or longer Unrealized Losses	[1]	11	12
Yen-denominated | Fixed maturities | Public utilities
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	90	83
Total Unrealized Losses	[1]	4	6
Less than 12 months Fair Value	[1]	0	0
Less than 12 months Unrealized Losses	[1]	0	0
12 months or longer Fair Value	[1]	90	83
12 months or longer Unrealized Losses	[1]	4	6
Yen-denominated | Fixed maturities | Sovereign and supranational
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	302	309
Total Unrealized Losses	[1]	27	1
Less than 12 months Fair Value	[1]	302	309
Less than 12 months Unrealized Losses	[1]	27	1
12 months or longer Fair Value	[1]	0	0
12 months or longer Unrealized Losses	[1]	0	0
Yen-denominated | Fixed maturities | Banks/financial institutions
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	1,467	1,507
Total Unrealized Losses	[1]	89	62
Less than 12 months Fair Value	[1]	645	394
Less than 12 months Unrealized Losses	[1]	14	4
12 months or longer Fair Value	[1]	822	1,113
12 months or longer Unrealized Losses	[1]	75	58
Yen-denominated | Fixed maturities | Other corporate
Investments, Unrealized Loss Position [Line Items]
Total Fair Value	[1]	302	440
Total Unrealized Losses	[1]	8	7
Less than 12 months Fair Value	[1]	276	349
Less than 12 months Unrealized Losses	[1]	6	4
12 months or longer Fair Value	[1]	26	91
12 months or longer Unrealized Losses	[1]	$ 2	$ 3

[1] Includes perpetual securities

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INVESTMENTS - Other Investments (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Other investments	[1]	$ 5,073	$ 3,402
Transitional real estate loans
Investment Holdings [Line Items]
Other investments		2,719	1,235
Commercial mortgage loans
Investment Holdings [Line Items]
Other investments		917	908
Middle market loans
Investment Holdings [Line Items]
Other investments		957	859
Policy loans
Investment Holdings [Line Items]
Other investments		227	210
Short-term investments
Investment Holdings [Line Items]
Other investments		0	57
Other investments
Investment Holdings [Line Items]
Other investments		$ 253	$ 133

[1] Includes $3,994 in 2018 and $2,341 in 2017 of loan receivables and limited partnerships from consolidated variable interest entities

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INVESTMENTS - Investments in Consolidated Variable Interest Entities (Detail) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Securities available for sale, fixed maturities, amortized cost	[1]	$ 81,607
Securities available for sale, fixed maturities, fair value	[1]	89,033
Equity securities	[2],[3]	1,108
Other investments	[4]	5,073	$ 3,402
Asset derivatives		797	331
Assets, fair value		95,018	89,215
Liability derivatives		353	474
Liabilities		123,069	112,619
Liabilities, fair value disclosure		353	474
Variable Interest Entity, Consolidated
Variable Interest Entity [Line Items]
Securities available for sale, fixed maturities, amortized cost	[5],[6]	4,695	4,538
Securities available for sale, fixed maturities, fair value	[5],[6]	5,431	5,509
Available-for-sale equity securities, amortized cost basis			606
Equity securities, FV-NI, cost		760
Equity securities		760
Available-for-sale securities, equity securities			753
Other investments	[7]	3,994	2,341
Other investments, fair value	[7]	3,974	2,328
Asset derivatives, amortized cost	[8]	241	151
Asset derivatives	[8]	241	151
Assets, amortized cost		9,690	7,636
Assets, fair value		10,406	8,741
Liability derivatives, amortized cost	[8]	86	128
Liability derivatives	[8]	86	128
Liabilities		86	128
Liabilities, fair value disclosure		$ 86	$ 128

[1] Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)

[2] Includes perpetual securities

[3] Includes perpetual securities ($71 at fair value)

[4] Includes $3,994 in 2018 and $2,341 in 2017 of loan receivables and limited partnerships from consolidated variable interest entities

[5] Includes perpetual securities

[6] Includes perpetual securities, see Notes 1 and 3 of the Notes to the Consolidated Financial Statements

[7] Consists of TREs, CMLs, MMLs, and alternative investments in limited partnerships

[8] Consists entirely of derivatives

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INVESTMENTS - Investments in Variable Interest Entities Not Consolidated (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Securities available for sale, fixed maturities, amortized cost	[1]	$ 81,607
Securities available for sale, fixed maturities, fair value	[1]	89,033
Securities held to maturity, fixed maturities, amortized cost		33,377	$ 31,430
Securities held to maturity, fixed maturities, fair value		40,468	38,072
Other investments	[2]	5,073	3,402
Assets, fair value		95,018	89,215
Variable Interest Entity, Not Consolidated
Variable Interest Entity [Line Items]
Securities available for sale, fixed maturities, amortized cost	[3]	5,194	5,004
Securities available for sale, fixed maturities, fair value	[3]	5,749	5,724
Securities held to maturity, fixed maturities, amortized cost		2,711	2,549
Securities held to maturity, fixed maturities, fair value		3,077	2,929
Other investments		110	55
Other investments, fair value		108	55
Assets, amortized cost		8,015	7,608
Assets, fair value		$ 8,934	$ 8,708

[1] Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)

[2] Includes $3,994 in 2018 and $2,341 in 2017 of loan receivables and limited partnerships from consolidated variable interest entities

[3] Includes perpetual securities

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INVESTMENTS - Securities Lending Transactions Accounted for as Secured Borrowings (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		$ 5,368	$ 606
Gross amount of recognized liabilities for securities lending		5,368	606
Amounts related to agreements not included in offsetting disclosure in Note 4		0	0
Japan government and agencies
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		4,894	49
Public utilities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		30	73
Banks/financial institutions
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		52	54
Other corporate
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		384	415
Equity securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		8	15
Maturity Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred	[1]	474	557
Maturity Overnight and Continuous | Japan government and agencies
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred	[1]	0	0
Maturity Overnight and Continuous | Public utilities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred	[1]	30	73
Maturity Overnight and Continuous | Banks/financial institutions
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred	[1]	52	54
Maturity Overnight and Continuous | Other corporate
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred	[1]	384	415
Maturity Overnight and Continuous | Equity securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred	[1]	8	15
Maturity up to 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		4,894	49
Maturity up to 30 Days | Japan government and agencies
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		4,894	49
Maturity up to 30 Days | Public utilities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		0	0
Maturity up to 30 Days | Banks/financial institutions
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		0	0
Maturity up to 30 Days | Other corporate
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		0	0
Maturity up to 30 Days | Equity securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred		$ 0	$ 0

[1] These securities are pledged as collateral under the Company's U.S. securities lending program and can be called at its discretion; therefore, they are classified as Overnight and Continuous.

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DERIVATIVE INSTRUMENTS - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) yr counterparties	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Cash flow hedging activity, maximum time period | yr	9
Number of counterparties | counterparties	15
Number of counterparties that comprise majority of aggregate notional amount of swaps | counterparties	4
Percentage of notional amount of swaps from certain number of counterparties	59.00%
Derivative, Net Liability Position, Aggregate Fair Value	$ 154		$ 264
Additional Collateral, Aggregate Fair Value	5
Net investment hedge
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	$ 0
2.40% senior notes due March 2020
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Debt instrument, principal amount	550
4.00% senior notes due February 2022
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Debt instrument, principal amount	350
3.625% senior notes due June 2023
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Debt instrument, principal amount	700
3.625% senior notes due November 2024
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Debt instrument, principal amount	750
3.25% senior notes due March 2025
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Debt instrument, principal amount	$ 450

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DERIVATIVE INSTRUMENTS - Summary of Balance Sheet Classification of Derivative Fair Value Amounts, as well as Gross Asset and Liability Fair Value Amounts (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	$ 27,220	$ 25,751
Derivative asset, fair value, gross asset including not subject to master netting arrangement	797	331
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(353)	(474)
Asset derivatives fair value	556	180
Liability derivatives fair value	(267)	(346)
Other assets
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	18,248	10,948
Asset derivatives fair value	797	331
Liability derivatives fair value	0	0
Other liabilities
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	8,972	14,803
Asset derivatives fair value	0	0
Liability derivatives fair value	(353)	(474)
Cash flow hedges
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	75	75
Asset derivatives fair value	1	0
Liability derivatives fair value	(2)	(8)
Cash flow hedges | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	75	75
Asset derivatives fair value	1	0
Liability derivatives fair value	(2)	(8)
Fair value hedges
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	14,670	15,310
Asset derivatives fair value	244	2
Liability derivatives fair value	(8)	(223)
Fair value hedges | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	5,550	7,640
Asset derivatives fair value	244	2
Liability derivatives fair value	(5)	(221)
Fair value hedges | Foreign currency options
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	9,120	7,670
Asset derivatives fair value	0	0
Liability derivatives fair value	(3)	(2)
Net investment hedge
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	0	439
Asset derivatives fair value	0	12
Liability derivatives fair value	0	(1)
Net investment hedge | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	0	5
Asset derivatives fair value	0	0
Liability derivatives fair value	0	0
Net investment hedge | Foreign currency options
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	0	434
Asset derivatives fair value	0	12
Liability derivatives fair value	0	(1)
Non-qualifying strategies
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	12,475	9,927
Asset derivatives fair value	552	317
Liability derivatives fair value	(343)	(242)
Non-qualifying strategies | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	5,426	5,386
Asset derivatives fair value	369	296
Liability derivatives fair value	(263)	(189)
Non-qualifying strategies | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	6,656	3,683
Asset derivatives fair value	182	20
Liability derivatives fair value	(80)	(53)
Non-qualifying strategies | Foreign currency options
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	299	770
Asset derivatives fair value	0	0
Liability derivatives fair value	0	0
Non-qualifying strategies | Credit default swaps
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	94	88
Asset derivatives fair value	1	1
Liability derivatives fair value	$ 0	$ 0

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DERIVATIVE INSTRUMENTS - Gains (Losses) Recognized on Fair Value Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fixed-maturity securities and equity securities | Foreign currency forwards
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized for derivatives		$ 341
Gains (losses) on derivatives excluded from effectiveness testing		(48)
Gains (losses) on derivatives included in effectiveness testing		389
Gains (losses) recognized for hedged items		(372)
Ineffectiveness recognized for fair value hedge		17
Fixed maturity securities | Foreign currency forwards
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized for derivatives	$ 414
Gains (losses) on derivatives excluded from effectiveness testing	(39)
Gains (losses) on derivatives included in effectiveness testing	453
Gains (losses) recognized for hedged items	(464)
Ineffectiveness recognized for fair value hedge	(11)
Fixed maturity securities | Foreign currency options
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized for derivatives	(1)	24
Gains (losses) on derivatives excluded from effectiveness testing	(1)	13
Gains (losses) on derivatives included in effectiveness testing	0	11
Gains (losses) recognized for hedged items	0	(10)
Ineffectiveness recognized for fair value hedge	$ 0	$ 1

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DERIVATIVE INSTRUMENTS - Derivatives and Hedging Instruments Gain (Loss) Summary (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized foreign currency translation gains (losses) during period		$ 824	$ 375
Derivative gains (losses)		144	(52)
Derivative and non-derivative hedging instruments gain (loss) recognized in other comprehensive income effective portion before tax	[1]	(86)	(47)
Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)		1	0
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	[1]	6	2
Cash flow hedges | Foreign currency swaps
Derivative Instruments, Gain (Loss) [Line Items]
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)		1	0
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	[1]	6	2
Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)		(51)	(17)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	[1]	0	0
Fair value hedges | Foreign currency forwards
Derivative Instruments, Gain (Loss) [Line Items]
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)	[2]	(50)	(31)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	[1],[2]	0	0
Fair value hedges | Foreign currency options
Derivative Instruments, Gain (Loss) [Line Items]
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)	[2]	(1)	14
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	[1],[2]	0	0
Net investment hedge
Derivative Instruments, Gain (Loss) [Line Items]
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)		0	0
Unrealized foreign currency translation gains (losses) during period	[1]	(92)	(49)
Net investment hedge | Non-derivative hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)		0	0
Unrealized foreign currency translation gains (losses) during period	[1]	(84)	(17)
Net investment hedge | Foreign currency forwards
Derivative Instruments, Gain (Loss) [Line Items]
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)		0	0
Unrealized foreign currency translation gains (losses) during period	[1]	0	(9)
Net investment hedge | Foreign currency options
Derivative Instruments, Gain (Loss) [Line Items]
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)		0	0
Unrealized foreign currency translation gains (losses) during period	[1]	(8)	(23)
Non-qualifying strategies
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net		194	(35)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	[1]	0	0
Non-qualifying strategies | Foreign currency swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net		14	(8)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	[1]	0	0
Non-qualifying strategies | Foreign currency forwards
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net		179	(27)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	[1]	0	0
Non-qualifying strategies | Foreign currency options
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net		1	0
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	[1]	$ 0	$ 0

[1] Cash flow hedge items are recorded as unrealized gains (losses) on derivatives and net investment hedge items are recorded in the unrealized foreign currency translation gains (losses) line in the consolidated statement of comprehensive income (loss).

[2] Impact shown net of effect of hedged items (see Fair Value Hedges section of this Note 4 for further detail)

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DERIVATIVE INSTRUMENTS - Fair Value and Notional Amounts of Derivatives With Counterparty Credit Risk (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	$ 27,220	$ 25,751
Asset Derivatives Fair Value	797	331
Liability Derivatives Fair Value	(353)	(474)
AA
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	4,685	4,708
Asset Derivatives Fair Value	123	52
Liability Derivatives Fair Value	(12)	(37)
A
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	22,081	20,604
Asset Derivatives Fair Value	673	271
Liability Derivatives Fair Value	(290)	(370)
BBB
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	454	439
Asset Derivatives Fair Value	1	8
Liability Derivatives Fair Value	$ (51)	$ (67)

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DERIVATIVE INSTRUMENTS - Offsetting of Financial Assets and Derivative Assets (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	$ 556	$ 180
Gross amount of liabilities offset in balance sheet	0	0
Net amount of derivative assets presented in the balance sheet	556	180
Financial instruments, amount not offset	(116)	(82)
Derivative, collateral, obligation to return securities	(343)	0
Derivative, collateral, obligation to return cash	(67)	(98)
Derivative asset, fair value, amount offset against collateral, subject to master netting agreement	30	0
Derivative asset, not subject to master netting arrangement	241	151
Derivative asset, fair value, amount offset against collateral, not subject to master netting agreement	241	151
Derivative asset, fair value, gross asset including not subject to master netting arrangement	797	331
Net amount of derivative assets presented in balance sheet	797	331
Derivative asset, fair value, amount offset against collateral	271	151
Gross amounts of recognized financial instruments	6,046	923
Gross amounts offset in balance sheet	0	0
Net amounts of assets presented in balance sheet	6,046	923
Carrying value of financial instruments not offset in balance sheet	(116)	(82)
Securities collateral, not offset in balance sheet	(343)	0
Cash collateral, not offset in balance sheet	(5,316)	(690)
Financial instruments, amount of assets offset against collateral	271	151
Securities lending and similar arrangements
Offsetting Assets [Line Items]
Gross amounts of recognized financial instruments	5,249	592
Gross amounts offset in balance sheet	0	0
Net amounts of assets presented in balance sheet	5,249	592
Carrying value of financial instruments not offset in balance sheet	0	0
Securities collateral, not offset in balance sheet	0	0
Cash collateral, not offset in balance sheet	(5,249)	(592)
Financial instruments, amount of assets offset against collateral	$ 0	$ 0

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DERIVATIVE INSTRUMENTS - Offsetting of Financial Liabilities and Derivative Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	$ (267)	$ (346)
Gross amount of assets offset in balance sheet	0	0
Derivative liability, fair value, amount not offset against collateral	(267)	(346)
Financial instruments, amount not offset	116	82
Derivative, collateral, right to reclaim securities	36	245
Derivative, collateral, right to reclaim cash	113	10
Derivative liability, fair value, amount offset against collateral, subject to master netting agreement	(2)	(9)
Derivative liability, not subject to master netting arrangement	(86)	(128)
Derivative liability, fair value, amount offset against collateral, not subject to master netting agreement	(86)	(128)
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(353)	(474)
Net amount of derivative liabilities presented in balance sheet	(353)	(474)
Derivative liability, fair value, amount offset against collateral	(88)	(137)
Gross Amounts of Recognized Financial Instruments, Offsetting Liabilities	(5,721)	(1,080)
Gross Amounts Offset in Statement of Financial Position, Offsetting Liabilities	0	0
Net Amounts of Financial Instruments Presented in Balance Sheet, Offsetting Liabilities	(5,721)	(1,080)
Carrying value of financial instruments, liabilities not offset in balance sheet	5,365	674
Securities Collateral, Liabilities Not Offset in Balance Sheet	36	245
Cash Collateral, Liabilities Not Offset in Balance Sheet	113	10
Financial instruments, amount of liabilities offset against collateral	(207)	(151)
Securities lending and similar arrangements
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Financial Instruments, Offsetting Liabilities	(5,368)	(606)
Gross Amounts Offset in Statement of Financial Position, Offsetting Liabilities	0	0
Net Amounts of Financial Instruments Presented in Balance Sheet, Offsetting Liabilities	(5,368)	(606)
Carrying value of financial instruments, liabilities not offset in balance sheet	5,249	592
Securities Collateral, Liabilities Not Offset in Balance Sheet	0	0
Cash Collateral, Liabilities Not Offset in Balance Sheet	0	0
Financial instruments, amount of liabilities offset against collateral	$ (119)	$ (14)

XML

FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017
Assets:
Available-for-sale securities	[1]	$ 89,033	[2]	$ 84,313	[3]
Equity securities	[1],[4]	1,108
Asset derivatives		797		331
Other Investments				57
Cash and cash equivalents		4,080		3,491
Total assets		95,018		89,215
Liabilities:
Liability derivatives		353		474
Total liabilities		353		474
Foreign currency swaps
Assets:
Asset derivatives		370		296
Liabilities:
Liability derivatives		265		197
Foreign currency forwards
Assets:
Asset derivatives		426		22
Liabilities:
Liability derivatives		85		274
Foreign currency options
Assets:
Asset derivatives				12
Liabilities:
Liability derivatives		3		3
Credit default swaps
Assets:
Asset derivatives		1		1
Fixed maturities
Assets:
Available-for-sale securities	[1]	89,033		84,313
Fixed maturities | Government and agencies
Assets:
Available-for-sale securities		36,736		31,230
Fixed maturities | Municipalities
Assets:
Available-for-sale securities		1,373		1,370
Fixed maturities | Mortgage- and asset-backed securities
Assets:
Available-for-sale securities		455		444
Fixed maturities | Public utilities
Assets:
Available-for-sale securities		7,807		7,954
Fixed maturities | Sovereign and supranational
Assets:
Available-for-sale securities		1,866		1,909
Fixed maturities | Banks/financial institutions
Assets:
Available-for-sale securities		9,144		8,933
Fixed maturities | Other corporate
Assets:
Available-for-sale securities		31,652		32,473
Equity securities
Assets:
Available-for-sale securities				1,023
Level 1
Assets:
Available-for-sale securities		35,325		30,109
Equity securities		1,015
Asset derivatives		0		0
Other Investments				57
Cash and cash equivalents		4,080		3,491
Total assets		40,420		34,658
Liabilities:
Total liabilities		0		0
Level 1 | Foreign currency swaps
Assets:
Asset derivatives		0		0
Liabilities:
Liability derivatives		0		0
Level 1 | Foreign currency forwards
Assets:
Asset derivatives		0		0
Liabilities:
Liability derivatives		0		0
Level 1 | Foreign currency options
Assets:
Asset derivatives				0
Liabilities:
Liability derivatives		0		0
Level 1 | Credit default swaps
Assets:
Asset derivatives		0		0
Level 1 | Fixed maturities
Assets:
Available-for-sale securities		35,325		30,109
Level 1 | Fixed maturities | Government and agencies
Assets:
Available-for-sale securities		35,325		30,109
Level 1 | Fixed maturities | Municipalities
Assets:
Available-for-sale securities		0		0
Level 1 | Fixed maturities | Mortgage- and asset-backed securities
Assets:
Available-for-sale securities		0		0
Level 1 | Fixed maturities | Public utilities
Assets:
Available-for-sale securities		0		0
Level 1 | Fixed maturities | Sovereign and supranational
Assets:
Available-for-sale securities		0		0
Level 1 | Fixed maturities | Banks/financial institutions
Assets:
Available-for-sale securities		0		0
Level 1 | Fixed maturities | Other corporate
Assets:
Available-for-sale securities		0		0
Level 1 | Equity securities
Assets:
Available-for-sale securities				1,001
Level 2
Assets:
Available-for-sale securities		53,272		53,790
Equity securities		77
Asset derivatives		556		180
Other Investments				0
Cash and cash equivalents		0		0
Total assets		53,905		53,976
Liabilities:
Total liabilities		267		346
Level 2 | Foreign currency swaps
Assets:
Asset derivatives		130		146
Liabilities:
Liability derivatives		179		69
Level 2 | Foreign currency forwards
Assets:
Asset derivatives		426		22
Liabilities:
Liability derivatives		85		274
Level 2 | Foreign currency options
Assets:
Asset derivatives				12
Liabilities:
Liability derivatives		3		3
Level 2 | Credit default swaps
Assets:
Asset derivatives		0		0
Level 2 | Fixed maturities
Assets:
Available-for-sale securities		53,272		53,790
Level 2 | Fixed maturities | Government and agencies
Assets:
Available-for-sale securities		1,411		1,121
Level 2 | Fixed maturities | Municipalities
Assets:
Available-for-sale securities		1,373		1,370
Level 2 | Fixed maturities | Mortgage- and asset-backed securities
Assets:
Available-for-sale securities		269		269
Level 2 | Fixed maturities | Public utilities
Assets:
Available-for-sale securities		7,724		7,886
Level 2 | Fixed maturities | Sovereign and supranational
Assets:
Available-for-sale securities		1,866		1,909
Level 2 | Fixed maturities | Banks/financial institutions
Assets:
Available-for-sale securities		9,120		8,908
Level 2 | Fixed maturities | Other corporate
Assets:
Available-for-sale securities		31,509		32,327
Level 2 | Equity securities
Assets:
Available-for-sale securities				6
Level 3
Assets:
Available-for-sale securities		436		414
Equity securities		16
Asset derivatives		241		151
Other Investments				0
Cash and cash equivalents		0		0
Total assets		693		581
Liabilities:
Total liabilities		86		128
Level 3 | Foreign currency swaps
Assets:
Asset derivatives		240		150
Liabilities:
Liability derivatives		86		128
Level 3 | Foreign currency forwards
Assets:
Asset derivatives		0		0
Liabilities:
Liability derivatives		0		0
Level 3 | Foreign currency options
Assets:
Asset derivatives				0
Liabilities:
Liability derivatives		0		0
Level 3 | Credit default swaps
Assets:
Asset derivatives		1		1
Level 3 | Fixed maturities
Assets:
Available-for-sale securities		436		414
Level 3 | Fixed maturities | Government and agencies
Assets:
Available-for-sale securities		0		0
Level 3 | Fixed maturities | Municipalities
Assets:
Available-for-sale securities		0		0
Level 3 | Fixed maturities | Mortgage- and asset-backed securities
Assets:
Available-for-sale securities		186		175
Level 3 | Fixed maturities | Public utilities
Assets:
Available-for-sale securities		83		68
Level 3 | Fixed maturities | Sovereign and supranational
Assets:
Available-for-sale securities		0		0
Level 3 | Fixed maturities | Banks/financial institutions
Assets:
Available-for-sale securities		24		25
Level 3 | Fixed maturities | Other corporate
Assets:
Available-for-sale securities		$ 143		146
Level 3 | Equity securities
Assets:
Available-for-sale securities				$ 16

[1] Includes perpetual securities

[2] Includes perpetual securities ($1,506 at amortized cost and $1,774 at fair value)

[3] Includes perpetual securities ($1,462 at amortized cost and $1,789 at fair value)

[4] Includes perpetual securities ($71 at fair value)

XML

FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Carried at Cost or Amortized Cost (Details) - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	[1]	$ 5,073		$ 3,402
Assets:
Securities held to maturity, fixed maturities, amortized cost		33,377		31,430
Securities held to maturity, fixed maturities, fair value		40,468		38,072
Other investments carried at amortized cost		4,608	[2]	3,017	[3]
Other investments carried at amortized cost, fair value		4,590	[2]	3,002	[3]
Total financial instruments assets not carried at fair value		37,985		34,447
Assets fair value disclosure financial instruments carried at cost		45,058		41,074
Liabilities:
Other policyholder funds		7,417		6,939
Other policyholders' funds fair value disclosure		7,307		6,841
Notes payable		5,352		5,267
Notes payable fair value disclosure		5,427		5,553
Total financial instrument liabilities not carried at fair value		12,769		12,206
Liabilities fair value disclosure financial instruments carried at cost		12,734		12,394
Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		40,468		38,072
Government and agencies | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, amortized cost		22,686		21,331
Securities held to maturity, fixed maturities, fair value		28,317		26,491
Municipalities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, amortized cost		379		357
Securities held to maturity, fixed maturities, fair value		493		462
Mortgage- and asset-backed securities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, amortized cost		26		26
Securities held to maturity, fixed maturities, fair value		28		27
Public utilities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, amortized cost		3,508		3,300
Securities held to maturity, fixed maturities, fair value		3,891		3,698
Sovereign and supranational | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, amortized cost		1,620		1,523
Securities held to maturity, fixed maturities, fair value		1,919		1,835
Banks/financial institutions | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, amortized cost		2,300		2,206
Securities held to maturity, fixed maturities, fair value		2,477		2,387
Other corporate | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, amortized cost		2,858		2,687
Securities held to maturity, fixed maturities, fair value		3,343		3,172
Policy loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments		227		210
Equity method investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments		238		118
Level 1
Assets:
Other investments carried at amortized cost, fair value		0	[2]	0	[3]
Assets fair value disclosure financial instruments carried at cost		28,317		26,491
Liabilities:
Other policyholders' funds fair value disclosure		0		0
Notes payable fair value disclosure		0		0
Liabilities fair value disclosure financial instruments carried at cost		0		0
Level 1 | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		28,317		26,491
Level 1 | Government and agencies | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		28,317		26,491
Level 1 | Municipalities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 1 | Mortgage- and asset-backed securities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 1 | Public utilities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 1 | Sovereign and supranational | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 1 | Banks/financial institutions | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 1 | Other corporate | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 2
Assets:
Other investments carried at amortized cost, fair value		15	[2]	15	[3]
Assets fair value disclosure financial instruments carried at cost		12,147		11,577
Liabilities:
Other policyholders' funds fair value disclosure		0		0
Notes payable fair value disclosure		5,146		5,288
Liabilities fair value disclosure financial instruments carried at cost		5,146		5,288
Level 2 | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		12,132		11,562
Level 2 | Government and agencies | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 2 | Municipalities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		493		462
Level 2 | Mortgage- and asset-backed securities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		9		8
Level 2 | Public utilities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		3,891		3,698
Level 2 | Sovereign and supranational | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		1,919		1,835
Level 2 | Banks/financial institutions | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		2,477		2,387
Level 2 | Other corporate | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		3,343		3,172
Level 3
Assets:
Other investments carried at amortized cost, fair value		4,575	[2]	2,987	[3]
Assets fair value disclosure financial instruments carried at cost		4,594		3,006
Liabilities:
Other policyholders' funds fair value disclosure		7,307		6,841
Notes payable fair value disclosure		281		265
Liabilities fair value disclosure financial instruments carried at cost		7,588		7,106
Level 3 | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		19		19
Level 3 | Government and agencies | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 3 | Municipalities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 3 | Mortgage- and asset-backed securities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		19		19
Level 3 | Public utilities | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 3 | Sovereign and supranational | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 3 | Banks/financial institutions | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		0		0
Level 3 | Other corporate | Fixed maturities
Assets:
Securities held to maturity, fixed maturities, fair value		$ 0		$ 0

[1] Includes $3,994 in 2018 and $2,341 in 2017 of loan receivables and limited partnerships from consolidated variable interest entities

[2] Excludes policy loans of $227 and equity method investments of $238, at carrying value

[3] Excludes policy loans of $210 and equity method investments of $118, at carrying value

XML

FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets by Pricing Source, Securities Carried at Fair Value (Details) - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	$ 89,033	[2]	$ 84,313	[3]
Equity securities	[1],[4]	1,108
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		35,325		30,109
Equity securities		1,015
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		53,272		53,790
Equity securities		77
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		436		414
Equity securities		16
Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		1,092
Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		1,015
Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		77
Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		0
Net asset value valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		16
Net asset value valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		0
Net asset value valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		0
Net asset value valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		16
Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	89,033		84,313
Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		35,325		30,109
Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		53,272		53,790
Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		436		414
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				1,023
Equity securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				1,001
Equity securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				6
Equity securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				16
Equity securities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				1,007
Equity securities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				1,001
Equity securities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				6
Equity securities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				0
Equity securities | Net asset value valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				16
Equity securities | Net asset value valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				0
Equity securities | Net asset value valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				0
Equity securities | Net asset value valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				16
Government and agencies | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		36,736		31,230
Government and agencies | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		35,325		30,109
Government and agencies | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,411		1,121
Government and agencies | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Government and agencies | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		36,736		31,230
Government and agencies | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		35,325		30,109
Government and agencies | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,411		1,121
Government and agencies | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Municipalities | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,373		1,370
Municipalities | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Municipalities | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,373		1,370
Municipalities | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Municipalities | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,373		1,370
Municipalities | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Municipalities | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,373		1,370
Municipalities | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Mortgage- and asset-backed securities | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		455		444
Mortgage- and asset-backed securities | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Mortgage- and asset-backed securities | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		269		269
Mortgage- and asset-backed securities | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		186		175
Mortgage- and asset-backed securities | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		269		269
Mortgage- and asset-backed securities | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Mortgage- and asset-backed securities | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		269		269
Mortgage- and asset-backed securities | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		186		175
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		186		175
Public utilities | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		7,807		7,954
Public utilities | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Public utilities | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		7,724		7,886
Public utilities | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		83		68
Public utilities | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		7,724		7,886
Public utilities | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Public utilities | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		7,724		7,886
Public utilities | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Public utilities | Fixed maturities | Discounted cash flow valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		83		68
Public utilities | Fixed maturities | Discounted cash flow valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Public utilities | Fixed maturities | Discounted cash flow valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Public utilities | Fixed maturities | Discounted cash flow valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		83		68
Sovereign and supranational | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,866		1,909
Sovereign and supranational | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Sovereign and supranational | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,866		1,909
Sovereign and supranational | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Sovereign and supranational | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,866		1,807
Sovereign and supranational | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Sovereign and supranational | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,866		1,807
Sovereign and supranational | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Sovereign and supranational | Fixed maturities | Consensus pricing valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				102
Sovereign and supranational | Fixed maturities | Consensus pricing valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				0
Sovereign and supranational | Fixed maturities | Consensus pricing valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				102
Sovereign and supranational | Fixed maturities | Consensus pricing valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities				0
Banks/financial institutions | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		9,144		8,933
Banks/financial institutions | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Banks/financial institutions | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		9,120		8,908
Banks/financial institutions | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		24		25
Banks/financial institutions | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		9,120		8,908
Banks/financial institutions | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Banks/financial institutions | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		9,120		8,908
Banks/financial institutions | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		24		25
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		24		25
Other corporate | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		31,652		32,473
Other corporate | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Other corporate | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		31,509		32,327
Other corporate | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		143		146
Other corporate | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		31,509		32,327
Other corporate | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Other corporate | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		31,509		32,327
Other corporate | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Other corporate | Fixed maturities | Discounted cash flow valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		143		146
Other corporate | Fixed maturities | Discounted cash flow valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Other corporate | Fixed maturities | Discounted cash flow valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Other corporate | Fixed maturities | Discounted cash flow valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		$ 143		$ 146

[1] Includes perpetual securities

[2] Includes perpetual securities ($1,506 at amortized cost and $1,774 at fair value)

[3] Includes perpetual securities ($1,462 at amortized cost and $1,789 at fair value)

[4] Includes perpetual securities ($71 at fair value)

XML

FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets by Pricing Source, Securities Carried at Amortized Cost (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	$ 40,468	$ 38,072
Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	40,468	38,072
Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	28,317	26,491
Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	12,132	11,562
Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	19	19
Government and agencies | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	28,317	26,491
Government and agencies | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	28,317	26,491
Government and agencies | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Government and agencies | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Government and agencies | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	28,317	26,491
Government and agencies | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	28,317	26,491
Government and agencies | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Government and agencies | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Municipalities | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	493	462
Municipalities | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Municipalities | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	493	462
Municipalities | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Municipalities | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	493	462
Municipalities | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Municipalities | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	493	462
Municipalities | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Mortgage- and asset-backed securities | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	28	27
Mortgage- and asset-backed securities | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Mortgage- and asset-backed securities | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	9	8
Mortgage- and asset-backed securities | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	19	19
Mortgage- and asset-backed securities | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	9	8
Mortgage- and asset-backed securities | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Mortgage- and asset-backed securities | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	9	8
Mortgage- and asset-backed securities | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	19	19
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	19	19
Public utilities | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	3,891	3,698
Public utilities | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Public utilities | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	3,891	3,698
Public utilities | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Public utilities | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	3,891	3,698
Public utilities | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Public utilities | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	3,891	3,698
Public utilities | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Sovereign and supranational | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	1,919	1,835
Sovereign and supranational | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Sovereign and supranational | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	1,919	1,835
Sovereign and supranational | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Sovereign and supranational | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	1,919	1,835
Sovereign and supranational | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Sovereign and supranational | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	1,919	1,835
Sovereign and supranational | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Banks/financial institutions | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	2,477	2,387
Banks/financial institutions | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Banks/financial institutions | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	2,477	2,387
Banks/financial institutions | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Banks/financial institutions | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	2,477	2,387
Banks/financial institutions | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Banks/financial institutions | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	2,477	2,387
Banks/financial institutions | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Other corporate | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	3,343	3,172
Other corporate | Fixed maturities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Other corporate | Fixed maturities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	3,343	3,172
Other corporate | Fixed maturities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Other corporate | Fixed maturities | Third party pricing vendor valuation technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	3,343	3,172
Other corporate | Fixed maturities | Third party pricing vendor valuation technique | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	0	0
Other corporate | Fixed maturities | Third party pricing vendor valuation technique | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	3,343	3,172
Other corporate | Fixed maturities | Third party pricing vendor valuation technique | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity, fixed maturities, fair value	$ 0	$ 0

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FAIR VALUE MEASUREMENTS - Changes in Investments and Derivatives Carried at Fair Value Classified as Level 3 (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		$ 453	$ 223
Realized investment gains (losses) included in earnings		126	38
Unrealized gains (losses) included in other comprehensive income (loss)		13	7
Purchases		16	37
Issuances		0	0
Sales		0	(1)
Settlements		(1)	(9)
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		607	295
Change in unrealized gains (losses) still held		126	38
Foreign currency swaps
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	[1]	22	(21)
Realized gains or losses included in earnings	[1]	126	38
Unrealized gains or losses included in other comprehensive income (loss)	[1]	6	2
Purchases	[1]	0	0
Issuances	[1]	0	0
Sales	[1]	0	0
Settlements	[1]	0	0
Transfers into Level 3	[1]	0	0
Transfers out of Level 3	[1]	0	0
Balance, end of period	[1]	154	19
Changes in unrealized gain (losses) still held	[1]	126	38
Credit default swaps
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	[1]	1	2
Realized gains or losses included in earnings	[1]	0	0
Unrealized gains or losses included in other comprehensive income (loss)	[1]	0	0
Purchases	[1]	0	0
Issuances	[1]	0	0
Sales	[1]	0	0
Settlements	[1]	0	0
Transfers into Level 3	[1]	0	0
Transfers out of Level 3	[1]	0	0
Balance, end of period	[1]	1	2
Changes in unrealized gain (losses) still held	[1]	0	0
Fixed maturities | Mortgage- and asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		175	198
Realized investment gains (losses) included in earnings		0	0
Unrealized gains (losses) included in other comprehensive income (loss)		11	6
Purchases		0	0
Issuances		0	0
Sales		0	0
Settlements		0	(9)
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		186	195
Change in unrealized gains (losses) still held		0	0
Fixed maturities | Public utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		68	16
Realized investment gains (losses) included in earnings		0	0
Unrealized gains (losses) included in other comprehensive income (loss)		(1)	0
Purchases		16	0
Issuances		0	0
Sales		0	0
Settlements		0	0
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		83	16
Change in unrealized gains (losses) still held		0	0
Fixed maturities | Banks/financial institutions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		25	25
Realized investment gains (losses) included in earnings		0	0
Unrealized gains (losses) included in other comprehensive income (loss)		(1)	(1)
Purchases		0	0
Issuances		0	0
Sales		0	0
Settlements		0	0
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		24	24
Change in unrealized gains (losses) still held		0	0
Fixed maturities | Other corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		146	0
Realized investment gains (losses) included in earnings		0	0
Unrealized gains (losses) included in other comprehensive income (loss)		(2)	0
Purchases		0	35
Issuances		0	0
Sales		0	0
Settlements		(1)	0
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		143	35
Change in unrealized gains (losses) still held		0	0
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		16	3
Realized investment gains (losses) included in earnings		0	0
Unrealized gains (losses) included in other comprehensive income (loss)		0	0
Purchases		0	2
Issuances		0	0
Sales		0	(1)
Settlements		0	0
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Balance, end of period		16	4
Change in unrealized gains (losses) still held		$ 0	$ 0

[1] Derivative assets and liabilities are presented net

XML

FAIR VALUE MEASUREMENTS - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0	$ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	$ 0	$ 0

XML

FAIR VALUE MEASUREMENTS - Fair Value Inputs Assets Quantitative Information (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2018		Dec. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities	[1]	$ 89,033	[2]	$ 84,313	[3]
Equity securities	[1],[4]	1,108
Asset derivatives		797		331
Assets, fair value		95,018		89,215
Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		436		414
Equity securities		16
Asset derivatives		241		151
Assets, fair value		693		581
Net asset value valuation technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity securities		16
Net asset value valuation technique | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity securities		16
Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities	[1]	89,033		84,313
Fixed maturities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		436		414
Equity securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities				1,023
Equity securities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities				16
Equity securities | Net asset value valuation technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities				16
Equity securities | Net asset value valuation technique | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities				16
Mortgage- and asset-backed securities | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		455		444
Mortgage- and asset-backed securities | Fixed maturities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		186		175
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		186		175
Mortgage- and asset-backed securities | Fixed maturities | Consensus pricing valuation technique | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		186		175
Public utilities | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		7,807		7,954
Public utilities | Fixed maturities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		83		68
Public utilities | Fixed maturities | Discounted cash flow valuation technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		83		68
Public utilities | Fixed maturities | Discounted cash flow valuation technique | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		83		68
Banks/financial institutions | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		9,144		8,933
Banks/financial institutions | Fixed maturities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		24		25
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		24		25
Banks/financial institutions | Fixed maturities | Consensus pricing valuation technique | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		24		25
Other corporate | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		31,652		32,473
Other corporate | Fixed maturities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		143		146
Other corporate | Fixed maturities | Discounted cash flow valuation technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		143		146
Other corporate | Fixed maturities | Discounted cash flow valuation technique | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		143		146
Foreign currency swaps
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset derivatives		370		296
Foreign currency swaps | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset derivatives		240		150
Credit default swaps
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset derivatives		1		1
Credit default swaps | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset derivatives		1		1
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Discounted cash flow valuation technique | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset derivatives		$ 185		$ 80
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Assets | Lower Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk		0.13%		0.09%
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Assets | Upper Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk		1.01%		0.90%
Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Foreign currency swaps | Discounted cash flow valuation technique | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset derivatives		$ 55		$ 70
Fair Value, Unobservable Input, Base Correlation, CDS Spreads, Recovery Rate | Credit default swaps | Discounted cash flow valuation technique | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset derivatives		$ 1		$ 1
Fair Value, Unobservable Input, Base Correlation, CDS Spreads, Recovery Rate | Credit default swaps | Assets | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk		0.15%		0.25%
Fair Value Inputs, Recovery Rate		37.24%		37.24%
Fair Value, Unobservable Input, Base Correlation, CDS Spreads, Recovery Rate | Credit default swaps | Assets | Lower Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Base Correlation	[5]	49.98%		46.33%
Fair Value, Unobservable Input, Base Correlation, CDS Spreads, Recovery Rate | Credit default swaps | Assets | Upper Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Base Correlation	[5]	54.13%		49.65%
Dollar-denominated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity securities		$ 397
Dollar-denominated | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		37,233		$ 38,703
Dollar-denominated | Equity securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities				328
Dollar-denominated | Mortgage- and asset-backed securities | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		171		173
Dollar-denominated | Public utilities | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		5,747		5,973
Dollar-denominated | Banks/financial institutions | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		3,264		3,433
Dollar-denominated | Other corporate | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		$ 26,561		$ 27,586
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Assets | Lower Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[6]	2.78%		2.40%
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Assets | Upper Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[6]	2.82%		2.54%
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Foreign currency swaps | Assets | Lower Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[6]	2.78%		2.40%
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Foreign currency swaps | Assets | Upper Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[6]	2.82%		2.54%
Yen-denominated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity securities		$ 711
Yen-denominated | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		51,800		$ 45,610
Yen-denominated | Equity securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities				695
Yen-denominated | Mortgage- and asset-backed securities | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		284		271
Yen-denominated | Public utilities | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		2,060		1,981
Yen-denominated | Banks/financial institutions | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		5,880		5,500
Yen-denominated | Other corporate | Fixed maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale securities		$ 5,091		$ 4,887
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Assets | Lower Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[7]	0.26%		0.26%
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Assets | Upper Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[7]	0.85%		0.85%
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Foreign currency swaps | Assets | Lower Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[7]	0.26%		0.26%
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Foreign currency swaps | Assets | Upper Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[7]	0.85%		0.85%

[1] Includes perpetual securities

[2] Includes perpetual securities ($1,506 at amortized cost and $1,774 at fair value)

[3] Includes perpetual securities ($1,462 at amortized cost and $1,789 at fair value)

[4] Includes perpetual securities ($71 at fair value)

[5] Range of base correlation for the Company's bespoke tranche for attachment and detachment points corresponding to market indices

[6] Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

[7] Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

XML

FAIR VALUE MEASUREMENTS - Fair Value Inputs Liabilities Quantitative Information (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liability derivatives		$ 353	$ 474
Liabilities, fair value disclosure		353	474
Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liabilities, fair value disclosure		86	128
Foreign currency swaps
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liability derivatives		265	197
Foreign currency swaps | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liability derivatives		86	128
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Discounted cash flow valuation technique | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liability derivatives		$ 84	$ 120
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Liability | Lower Limit | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk		0.17%	0.13%
Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Liability | Upper Limit | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Entity Credit Risk		1.70%	1.57%
Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Foreign currency swaps | Discounted cash flow valuation technique | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liability derivatives		$ 2	$ 8
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Liability | Lower Limit | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[1]	2.78%	2.40%
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Liability | Upper Limit | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[1]	2.82%	2.54%
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Foreign currency swaps | Liability | Lower Limit | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[1]	2.78%	2.40%
Dollar-denominated | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Foreign currency swaps | Liability | Upper Limit | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[1]	2.82%	2.54%
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Liability | Lower Limit | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[2]	0.26%	0.26%
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD), Interest Rates (JPY) and CDS Spreads | Foreign currency swaps | Liability | Upper Limit | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[2]	0.85%	0.85%
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Foreign currency swaps | Liability | Lower Limit | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[2]	0.26%	0.26%
Yen-denominated | Fair Value, Unobservable Input, Interest Rates (USD) and Interest Rates (JPY) | Foreign currency swaps | Liability | Upper Limit | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	[2]	0.85%	0.85%

[1] Inputs derived from U.S. long-term rates to accommodate long maturity nature of the Company's swaps

[2] Inputs derived from Japan long-term rates to accommodate long maturity nature of the Company's swaps

XML

POLICY LIABILITIES - Changes in Liability for Unpaid Policy Claims (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Liability for Unpaid Claims and Claims Expenses
Net balance, beginning of period	$ 4,392
Less claims paid during the period on claims incurred during:
Net balance, end of period	4,630
Total liability for unpaid policy claims	4,630	$ 4,230
Health insurance
Liability for Unpaid Claims and Claims Expenses
Unpaid supplemental health claims, beginning of period	3,884	3,707
Less reinsurance recoverables	30	27
Net balance, beginning of period	3,854	3,680
Add claims incurred during the period related to:
Current year	1,842	1,737
Prior years	(192)	(111)
Total incurred	1,650	1,626
Less claims paid during the period on claims incurred during:
Current year	518	505
Prior years	1,116	1,055
Total paid	1,634	1,560
Effect of foreign exchange rate changes on unpaid claims	142	80
Net balance, end of period	4,012	3,826
Add reinsurance recoverables	31	29
Total liability for unpaid policy claims	4,043	3,855
Life insurance
Less claims paid during the period on claims incurred during:
Total liability for unpaid policy claims	$ 587	$ 375

XML

POLICY LIABILITIES - Additional Information (Details) - Health insurance - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior years claims and claims adjustment expense	$ (192)	$ (111)
Aflac Japan
Liability for Future Policy Benefit, by Product Segment [Line Items]
Prior years claims and claims adjustment expense	$ (97)
Percentage of total prior year claims and claims adjustment expense	51.00%
Liability for unpaid claims and claims adjustment expense, foreign currency translation gain (loss)	$ (5)
Prior year claims and claims adjustment expense excluding effect of foreign currency	$ (92)
Percentage of total prior year claims and claims adjustment expense excluding effect of foreign currency	48.00%

XML

REINSURANCE - Additional Information (Details) $ in Millions, ¥ in Billions	3 Months Ended
	Mar. 31, 2018 JPY (¥)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Effects of Reinsurance [Line Items]
Percent change in spot yen/dollar exchange rate		6.40%
Percent change in ceded reserves		0.40%
Aflac Japan
Effects of Reinsurance [Line Items]
Committed reinsurance facility | ¥	¥ 110
Aflac Japan | Closed Block
Effects of Reinsurance [Line Items]
Reinsurance deferred profit liability		$ 1,000
Reinsurance recoverable		$ 969	$ 908

XML

REINSURANCE - Effect of Reinsurance on Premiums and Benefits and Claims (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Effects of Reinsurance [Line Items]
Direct premium income	$ 4,833	$ 4,724
Net premium income	4,745	4,638
Direct benefits and claims	3,119	3,129
Benefits and claims, net	3,042	3,052
All other
Effects of Reinsurance [Line Items]
Ceded premiums	(15)	(12)
Assumed premiums earned	2	2
Ceded benefits and claims	(12)	(11)
Assumed benefits and claims from other companies	0	2
Aflac Japan
Effects of Reinsurance [Line Items]
Net premium income	3,263	3,194
Aflac Japan | Closed Block
Effects of Reinsurance [Line Items]
Ceded premiums	(129)	(130)
Assumed premiums earned	54	54
Ceded benefits and claims	(117)	(122)
Assumed benefits and claims from other companies	52	54
Intercompany eliminations
Effects of Reinsurance [Line Items]
Ceded benefits and claims	12	13
Assumed benefits and claims from other companies	$ (12)	$ (13)

XML

NOTES PAYABLE - Additional Information (Details) $ in Millions	Mar. 31, 2018 USD ($)
Lines of credit
Debt Instrument [Line Items]
Debt instrument, debt default, amount	$ 0
Notes Payable
Debt Instrument [Line Items]
Debt instrument, debt default, amount	$ 0

XML

NOTES PAYABLE - Summary of Notes Payable (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Notes payable	$ 5,372	$ 5,289
2.40% senior notes due March 2020
Debt Instrument [Line Items]
Notes payable	548	548
4.00% senior notes due February 2022
Debt Instrument [Line Items]
Notes payable	348	348
3.625% senior notes due June 2023
Debt Instrument [Line Items]
Notes payable	697	697
3.625% senior notes due November 2024
Debt Instrument [Line Items]
Notes payable	746	745
3.25% senior notes due March 2025
Debt Instrument [Line Items]
Notes payable	446	446
2.875% senior notes due October 2026
Debt Instrument [Line Items]
Notes payable	297	297
6.90% senior notes due December 2039
Debt Instrument [Line Items]
Notes payable	220	220
6.45% senior notes due August 2040
Debt Instrument [Line Items]
Notes payable	254	254
4.00% senior notes due October 2046
Debt Instrument [Line Items]
Notes payable	394	394
.932% senior notes due January 2027
Debt Instrument [Line Items]
Notes payable	562	528
2.108% subordinated notes due October 2047
Debt Instrument [Line Items]
Notes payable	559	526
Yen-denominated loan variable interest rate due September 2021
Debt Instrument [Line Items]
Notes payable	47	44
Yen-denominated loan variable interest rate due September 2023
Debt Instrument [Line Items]
Notes payable	234	220
Capitalized lease obligations
Debt Instrument [Line Items]
Notes payable	$ 20	$ 22

XML

NOTES PAYABLE - Summary of Notes Payable (Parenthetical) (Details) $ in Millions, ¥ in Billions	Mar. 31, 2018 USD ($)	Mar. 31, 2018 JPY (¥)	Dec. 31, 2017 JPY (¥)
2.40% senior notes due March 2020
Debt Instrument [Line Items]
Debt instrument, interest rate	2.40%	2.40%	2.40%
Debt instrument, principal amount	$ 550
4.00% senior notes due February 2022
Debt Instrument [Line Items]
Debt instrument, interest rate	4.00%	4.00%	4.00%
Debt instrument, principal amount	$ 350
3.625% senior notes due June 2023
Debt Instrument [Line Items]
Debt instrument, interest rate	3.625%	3.625%	3.625%
Debt instrument, principal amount	$ 700
3.625% senior notes due November 2024
Debt Instrument [Line Items]
Debt instrument, interest rate	3.625%	3.625%	3.625%
Debt instrument, principal amount	$ 750
3.25% senior notes due March 2025
Debt Instrument [Line Items]
Debt instrument, interest rate	3.25%	3.25%	3.25%
Debt instrument, principal amount	$ 450
2.875% senior notes due October 2026
Debt Instrument [Line Items]
Debt instrument, interest rate	2.875%	2.875%	2.875%
6.90% senior notes due December 2039
Debt Instrument [Line Items]
Debt instrument, interest rate	6.90%	6.90%	6.90%
6.45% senior notes due August 2040
Debt Instrument [Line Items]
Debt instrument, interest rate	6.45%	6.45%	6.45%
4.00% senior notes due October 2046
Debt Instrument [Line Items]
Debt instrument, interest rate	4.00%	4.00%	4.00%
.932% senior notes due January 2027
Debt Instrument [Line Items]
Debt instrument, interest rate	0.932%	0.932%	0.932%
Debt instrument, principal amount | ¥		¥ 60.0	¥ 60.0
2.108% subordinated notes due October 2047
Debt Instrument [Line Items]
Debt instrument, interest rate	2.108%	2.108%	2.108%
Debt instrument, principal amount | ¥		¥ 60.0	¥ 60.0
Yen-denominated loan variable interest rate due September 2021
Debt Instrument [Line Items]
Debt instrument, interest rate	0.32%	0.32%	0.32%
Debt instrument, principal amount | ¥		¥ 5.0	¥ 5.0
Yen-denominated loan variable interest rate due September 2023
Debt Instrument [Line Items]
Debt instrument, interest rate	0.47%	0.47%	0.47%
Debt instrument, principal amount | ¥		¥ 25.0	¥ 25.0

XML

NOTES PAYABLE - Summary of Lines of Credit (Details) - 3 months ended Mar. 31, 2018 ¥ in Millions, $ in Millions	USD ($)	JPY (¥)
$100 million line of credit
Line of Credit Facility [Line Items]
Line of credit facility, interest rate description	The rate quoted by the bank and agreed upon at the time of borrowing
Line of credit facility term	364 days
Line of credit facility, maximum borrowing capacity | $	$ 100
Line of credit facility, amount outstanding | $	$ 0
100.0 billion yen line of credit
Line of Credit Facility [Line Items]
Line of credit facility, interest rate description	A rate per annum equal to (a) Tokyo interbank market rate (TIBOR) plus, the alternative applicable TIBOR margin during the availability period from the closing date to the commitment termination date or (b) the TIBOR rate offered by the agent to major banks in yen for the applicable period plus, the applicable alternative TIBOR margin during the term out period
Line of credit facility term	3 years
Line of credit facility, maximum borrowing capacity | ¥		¥ 100,000
Line of credit facility, amount outstanding | ¥		0
55.0 billion yen line of credit
Line of Credit Facility [Line Items]
Line of credit facility, interest rate description	A rate per annum equal to, at the Company's option, either, (a) London Interbank Offered Rate (LIBOR) adjusted for certain costs or (b) a base rate determined by reference to the highest of (1) the federal funds rate plus 1/2 of 1%, (2) the rate of interest for such day announced by Mizuho Bank, Ltd. as its prime rate, or (3) the eurocurrency rate for an interest period of one month plus 1.00%, in each case plus an applicable margin
Line of credit facility term	5 years
Line of credit facility, maximum borrowing capacity | ¥		55,000
Line of credit facility, amount outstanding | ¥		0
$50 million line of credit
Line of Credit Facility [Line Items]
Line of credit facility, interest rate description	A rate per annum equal to, at the Parent Company's option, either (a) a eurocurrency rate determined by reference to the agent's LIBOR for the interest period relevant to such borrowing or (b) the base rate determined by reference to the greater of (i) the prime rate as determined by the agent, and (ii) the sum of 0.50% and the federal funds rate for such day
Line of credit facility, maximum borrowing capacity | $	$ 50
Line of credit facility, amount outstanding | $	$ 0
$250 million line of credit
Line of Credit Facility [Line Items]
Line of credit facility, interest rate description	USD three-month LIBOR plus 75 basis points per annum
Line of credit facility term	364 days
Line of credit facility, maximum borrowing capacity | $	$ 250
Line of credit facility, amount outstanding | $	$ 0
Debt instrument, term	3 months
37.5 billion yen line of credit
Line of Credit Facility [Line Items]
Line of credit facility, interest rate description	Three-month TIBOR plus 80 basis points per annum
Line of credit facility term	364 days
Line of credit facility, maximum borrowing capacity | ¥		37,500
Line of credit facility, amount outstanding | ¥		¥ 0
Debt instrument, term	3 months
Lower Limit | 100.0 billion yen line of credit
Line of Credit Facility [Line Items]
Line of credit facility, commitment fee percentage	0.30%
Lower Limit | 55.0 billion yen line of credit
Line of Credit Facility [Line Items]
Line of credit facility, commitment fee percentage	0.085%
Upper Limit | $100 million line of credit
Line of Credit Facility [Line Items]
Debt instrument, term	3 months
Upper Limit | 100.0 billion yen line of credit
Line of Credit Facility [Line Items]
Line of credit facility, commitment fee percentage	0.50%
Upper Limit | 55.0 billion yen line of credit
Line of Credit Facility [Line Items]
Line of credit facility, commitment fee percentage	0.225%
Upper Limit | $50 million line of credit
Line of Credit Facility [Line Items]
Debt instrument, term	3 months

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INCOME TAXES (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			12 Months Ended
	Jan. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 22, 2017
Income Taxes [Line Items]
Effective tax rate	21.00%	21.00%		35.00%	35.00%
Income Tax Expense, Gross, Continuing Operations, Adjustment of Deferred Tax Assets			$ 1,000
Income Tax Benefit, Gross, Continuing Operations, Adjustment of Deferred Tax Liabilities					$ 2,900
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax Asset (Liability)			(1,900)		(1,900)
Deferred Tax Assets, Valuation Allowance			$ 700		$ 700
Aflac Japan
Income Taxes [Line Items]
Deferred Tax Liabilities, Net						$ 4,500

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SHAREHOLDERS' EQUITY - Reconciliation of Number of Shares of Common Stock (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Common Stock Issued [Roll Forward]
Balance, beginning of period	1,345,762	1,342,498
Exercise of stock options and issuance of restricted shares	1,014	868
Balance, end of period	1,346,776	1,343,366
Treasury Stock [Roll Forward]
Balance, beginning of period	564,852	530,877
Balance, end of period	571,019	547,361
Shares outstanding, end of period	775,757	796,005
Treasury Stock
Treasury Stock [Roll Forward]
Stock acquired in open market, shares	6,640	16,986
Other purchases	315	288
Shares issued to AFL Stock Plan	(384)	(494)
Exercise of stock options	(305)	(256)
Other dispositions	(99)	(40)

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SHAREHOLDERS' EQUITY - Anti-Dilutive Share-Based Awards Excluded from Calculation of Diluted Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stockholders' Equity Note [Abstract]
Anti-dilutive share-based awards	9	642

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SHAREHOLDERS' EQUITY - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Aug. 31, 2017
Stockholders Equity Note [Line Items]
Common stock, share repurchase, dollar amount	$ 296	$ 610
Remaining common stock available for purchase under share repurchase authorizations	91.4
Share Repurchase Program
Stockholders Equity Note [Line Items]
Stock acquired in open market, shares	6.6	17.0
Common stock, share repurchase, dollar amount	$ 296	$ 600
Share Repurchase Authorization 2017
Stockholders Equity Note [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			80.0

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SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018		Mar. 31, 2017
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	$ 4,028		$ 2,630
Other comprehensive income loss before reclassifications net of tax	[1]	(571)		(10)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	228		12
Other comprehensive income (loss), net of tax	[1]	(343)		2
Balance, end of period	[1]	3,685		2,632
Unrealized foreign currency translation gains (losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(1,750)		(1,983)
Other comprehensive income loss before reclassifications net of tax	[1]	447		333
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0		0
Other comprehensive income (loss), net of tax	[1]	447		333
Balance, end of period	[1]	(1,303)		(1,650)
Unrealized gains (losses) on investment securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	5,964		4,805
Other comprehensive income loss before reclassifications net of tax	[1]	(983)		(341)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	225	[2]	10
Other comprehensive income (loss), net of tax	[1]	(758)		(331)
Balance, end of period	[1]	5,206		4,474
Unrealized gains (losses) on derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(23)		(24)
Other comprehensive income loss before reclassifications net of tax	[1]	2		2
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0		0
Other comprehensive income (loss), net of tax	[1]	2		2
Balance, end of period	[1]	(21)		(22)
Pension liability adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(163)		(168)
Other comprehensive income loss before reclassifications net of tax	[1]	(37)		(4)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	3		2
Other comprehensive income (loss), net of tax	[1]	(34)		(2)
Balance, end of period	[1]	(197)		(170)
Accounting Standards Update 2016-01 | Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect of change in accounting principle, net of income taxes	[3]	(148)		0
Accounting Standards Update 2018-02 | Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect of change in accounting principle, net of income taxes	[3]	$ 374		$ 0

[1] All amounts in the table above are net of tax.

[2] Includes amounts reclassified due to changes in accounting principles of $(148) related to financial instruments and $374 related to tax effects from tax reform

[3] See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018.

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SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended				12 Months Ended
		Jan. 31, 2018	Mar. 31, 2018		Mar. 31, 2017		Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other than temporary impairment losses realized			$ (7)		$ (10)
Total before tax			982		898
Income tax (expense) or benefit			(265)		(306)
Net of tax			$ 717		$ 592
Blended statutory income tax rate			27.00%
Statutory U.S. tax rate		21.00%	21.00%		35.00%		35.00%
Reclassification Out Of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax			$ (2)		$ (12)
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized gains (losses) on investment securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales and redemptions			2		(6)
Other than temporary impairment losses realized			0		(10)
Total before tax			2		(16)
Income tax (expense) or benefit			(1)	[1]	6	[2]
Net of tax			1		(10)
Reclassification Out Of Accumulated Other Comprehensive Income | Pension liability adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Acquisition and operating expenses, actuarial gains (losses)	[3]		(4)		(3)
Acquisition and operating expenses, prior service (cost) credit	[3]		0		0
Income tax (expense) or benefit			1	[1]	1	[2]
Net of tax			$ (3)		$ (2)

[1] Based on 27% blended tax rate

[2] Based on 35% tax rate

[3] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 12 for additional details)

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SHARE-BASED COMPENSATION - Additional Information (Detail) - USD ($) shares in Thousands, $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from stock options exercised		$ 23	$ 17
Tax benefit from exercise of stock options		$ 12	$ 14
Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, maximum number of shares issuable		75,000
Share-based compensation arrangement by share-based payment award, maximum number of shares issuable other than options and stock appreciation rights		38,000
Shares available for future grants under the long-term incentive plan		40,500
Long-term incentive plan awards, term (in years)		10 years
Long-term incentive plan awards, vesting period		3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost not yet recognized, restricted stock awards		$ 62
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number, shares		3,517		3,635
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition		1 year 6 months
Restricted stock awards, grants in period		918
Performance based Vesting Condition | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost not yet recognized, restricted stock awards		$ 30
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number, shares		826
Restricted stock awards, grants in period	432

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SHARE-BASED COMPENSATION - Stock Options Outstanding and Exercisable (Detail) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options Outstanding - Stock Option Shares | shares	6,306
Options Outstanding - Weighted-Average Remaining Term (Yrs)	5 years 6 months
Options Outstanding - Aggregate Intrinsic Value | $	$ 99
Options Outstanding - Weighted-Average Exercise Price Per Share | $ / shares	$ 28.03
Options Exercisable - Stock Option Shares | shares	4,439
Options Exercisable - Weighted-Average Remaining Term (Yrs.)	4 years 4 months 24 days
Options Exercisable - Aggregate Intrinsic Value | $	$ 77
Options Exercisable - Weighted-Average Exercise Price Per Share | $ / shares	$ 26.45

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SHARE-BASED COMPENSATION - Restricted Stock Activity (Details) - Restricted Stock shares in Thousands	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Shares
Beginning Balance | shares	3,635
Granted | shares	918
Canceled | shares	(56)
Vested | shares	(980)
Ending Balance | shares	3,517
Weighted-Average Grant-Date Fair Value Per Share
Beginning Balance | $ / shares	$ 32.40
Granted | $ / shares	44.12
Cancelled | $ / shares	33.18
Vested | $ / shares	31.50
Ending Balance | $ / shares	$ 35.70

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BENEFIT PLANS - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic (benefit) cost, excluding service cost		$ 5,000,000	$ 5,000,000
Amount of years active employees have left to meet rule of 80 in order to be eligible for postretirement medical benefits				5 years
Amount of years left to meet 15 year service requirement for active employees age 55 or older to be eligible for postretirement medical benefits				5 years
Defined Contribution Plan, Special Contribution, Per Employee	$ 500
Percentage of matching contributions by the Company to employee's contributions to 401(k) plan	100.00%
Lower Limit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care plan, retirement age and years of service combined years for eligibility (rule of 80)				80 years
Health care plan, retirement age for eligibility, (in years)				55 years
Health care plan, number of years of service for eligibility				15 years
Upper Limit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of matching contributions by the Company to employee's contributions to 401(k) plan	4.00%
Japan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions		6,000,000
U.S. | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions		$ 10,000,000

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BENEFIT PLANS - Net Periodic (Benefit) Cost Included in Acquisition and Operating Expenses (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0	$ 0
Interest cost	0	0
Expected return on plan assets	0	0
Amortization of net actuarial loss	0	0
Amortization of prior service cost (credit)	0	0
Net periodic (benefit) cost	0	0
Japan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	5	5
Interest cost	2	1
Expected return on plan assets	(2)	(1)
Amortization of net actuarial loss	0	0
Amortization of prior service cost (credit)	0	0
Net periodic (benefit) cost	5	5
U.S. | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	7	6
Interest cost	9	8
Expected return on plan assets	(7)	(6)
Amortization of net actuarial loss	4	3
Amortization of prior service cost (credit)	0	0
Net periodic (benefit) cost	$ 13	$ 11

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COMMITMENTS AND CONTINGENT LIABILITIES - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Commitments And Contingencies Disclosure [Line Items]
Loss contingency accrual, insurance-related assessment, discount rate		4.25%
Loss contingency, discounted amount of insurance-related assessment liability		$ 62
Loss contingency, undiscounted amount of insurance-related assessment liability		94
Loss contingency, insurance-related assessment, discounted amount of premium tax offset		48
Loss contingency, insurance-related assessment, undiscounted amount of premium tax offset		74
Loss contingency, loss in period		$ 14
Loss contingency, discounted amount of insurance-related assessment liability, realization period for associated asset offsets (in years)	4