POLICY LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2023

Insurance Loss Reserves [Abstract]

Schedule of Changes in Present Value of Expected Net Premiums and Expected Future Policy Benefits

The following tables present the changes in the present value of expected future net premiums and the present value of expected future policy benefits by reporting segment and disaggregated by product type for the years ended December 31. The present value of expected future net premiums and the present value of expected future policy benefits are presented gross of internal and external ceded reinsurance.

	2023
	Aflac Japan								Aflac U.S.
(In millions)	Cancer		Medical and Other Health		Life Insurance		Other		Accident		Disability		Critical Care		Hospital Indemnity		Dental/Vision		Life Insurance		Other
Present value of expected future net premiums:
Balance at December 31, 2022	$	19,298	$	16,714	$	7,485	$	1,256	$	2,534	$	1,635	$	4,486	$	1,220	$	211	$	724	$	110
Beginning balance at original discount rate	18,221		16,195		7,284		1,242		2,760		1,775		5,050		1,365		231		799		118
Effect of changes in cash flow assumptions	(165)		(470)		43		(12)		(16)		(51)		(494)		(142)		(9)		61		(9)
Effect of actual variances from expected    experience	(315)		(137)		(42)		(15)		(58)		(29)		(223)		(73)		(17)		(25)		(2)
Adjusted beginning of period balance	17,741		15,588		7,285		1,215		2,686		1,695		4,333		1,150		205		835		107
Issuances	1,034		418		335		26		323		376		493		249		44		181		169
Interest accrual	412		334		124		20		102		62		179		45		8		31		6
Net premiums collected (1)	(1,564)		(1,261)		(1,017)		(112)		(473)		(390)		(580)		(247)		(39)		(137)		(17)
Foreign currency translation	(1,170)		(1,038)		(469)		(80)		0		0		0		0		0		0		0
Other	(1)		(1)		0		0		(8)		(5)		(9)		(4)		(1)		(1)		7
Ending balance at original discount rate	16,452		14,040		6,258		1,069		2,630		1,738		4,416		1,193		217		909		272
Effect of changes in discount rate assumptions	1,057		657		230		19		(142)		(86)		(342)		(86)		(11)		(56)		5
Balance at December 31, 2023	$	17,509	$	14,697	$	6,488	$	1,088	$	2,488	$	1,652	$	4,074	$	1,107	$	206	$	853	$	277
Present value of expected future policy benefits:
Balance at December 31, 2022	$	54,766	$	27,419	$	31,954	$	5,582	$	3,098	$	2,445	$	11,489	$	2,074	$	488	$	1,526	$	622
Beginning balance at original discount rate	47,677		27,566		32,800		5,940		3,391		2,636		12,846		2,300		532		1,778		624
Effect of changes in cash flow assumptions	(147)		(507)		65		(27)		(11)		(59)		(592)		(194)		(14)		72		(13)
Effect of actual variances from expected    experience	(385)		(154)		(51)		(15)		(75)		(59)		(271)		(99)		(22)		(32)		(4)
Adjusted beginning of period balance	47,145		26,905		32,814		5,898		3,305		2,518		11,983		2,007		496		1,818		607
Issuances	1,059		432		341		32		331		392		505		258		46		185		169
Interest accrual	1,473		608		625		100		127		96		524		84		21		68		33
Benefit payments	(2,987)		(1,153)		(1,415)		(206)		(464)		(465)		(893)		(274)		(59)		(105)		(48)
Foreign currency translation	(3,064)		(1,769)		(2,109)		(380)		0		0		0		0		0		0		0
Other	0		0		0		0		3		0		1		1		2		5		8
Ending balance at original discount rate	43,626		25,023		30,256		5,444		3,302		2,541		12,120		2,076		506		1,971		769
Effect of changes in discount rate assumptions	6,535		234		(525)		(266)		(193)		(119)		(830)		(133)		(28)		(207)		29
Balance at December 31, 2023	50,161		25,257		29,731		5,178		3,109		2,422		11,290		1,943		478		1,764		798
Net liability for future policy benefits	32,652		10,560		23,243		4,090		621		770		7,216		836		272		911		521
Less: reinsurance recoverable	4,135		1,521		0		0		0		0		0		0		0		15		0
Net liability for future policy benefits after    reinsurance recoverable	$	28,517	$	9,039	$	23,243	$	4,090	$	621	$	770	$	7,216	$	836	$	272	$	896	$	521

(1) Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected future benefit payments.

	2022
	Aflac Japan								Aflac U.S.
(In millions)	Cancer		Medical and Other Health		Life Insurance		Other		Accident		Disability		Critical Care		Hospital Indemnity		Dental/Vision		Life Insurance		Other
Present value of expected future net premiums:
Balance at December 31, 2021	$	25,893	$	21,174	$	10,847	$	1,586	$	3,283	$	1,862	$	6,023	$	1,467	$	264	$	834	$	153
Beginning balance at original discount rate	22,470		18,681		10,064		1,461		2,999		1,760		5,391		1,380		241		780		135
Effect of changes in cash flow assumptions	(639)		317		(494)		25		(52)		5		(38)		42		10		(1)		(12)
Effect of actual variances from expected    experience	(284)		61		(81)		(10)		(152)		(43)		(421)		(111)		(20)		(16)		6
Adjusted beginning of period balance	21,547		19,059		9,489		1,476		2,795		1,722		4,932		1,311		231		763		129
Issuances	947		639		221		62		355		384		537		273		33		146		0
Interest accrual	459		364		146		22		105		57		193		45		9		27		5
Net premiums collected (1)	(1,734)		(1,376)		(1,229)		(123)		(496)		(382)		(612)		(261)		(42)		(131)		(17)
Foreign currency translation	(2,997)		(2,488)		(1,343)		(195)		0		0		0		0		0		0		0
Other	(1)		(3)		0		0		1		(6)		0		(3)		0		(6)		1
Ending balance at original discount rate	18,221		16,195		7,284		1,242		2,760		1,775		5,050		1,365		231		799		118
Effect of changes in discount rate assumptions	1,077		519		201		14		(226)		(140)		(564)		(145)		(20)		(75)		(8)
Balance at December 31, 2022	$	19,298	$	16,714	$	7,485	$	1,256	$	2,534	$	1,635	$	4,486	$	1,220	$	211	$	724	$	110
Present value of expected future policy benefits:
Balance at December 31, 2021	$	72,747	$	36,021	$	42,720	$	7,322	$	3,949	$	2,871	$	15,388	$	2,552	$	616	$	1,843	$	837
Beginning balance at original discount rate	56,807		31,398		39,002		6,787		3,594		2,670		13,079		2,300		549		1,694		645
Effect of changes in cash flow assumptions	(721)		352		(550)		96		(70)		5		(43)		40		13		(1)		(15)
Effect of actual variances from expected    experience	(333)		83		(91)		(10)		(177)		(48)		(465)		(130)		(23)		(21)		7
Adjusted beginning of period balance	55,753		31,833		38,361		6,873		3,347		2,627		12,571		2,210		539		1,672		637
Issuances	960		646		222		68		364		397		550		282		34		149		0
Interest accrual	1,599		642		670		106		128		94		539		85		21		62		32
Benefit payments	(3,050)		(1,375)		(1,248)		(202)		(456)		(483)		(823)		(277)		(62)		(103)		(45)
Foreign currency translation	(7,585)		(4,180)		(5,205)		(905)		0		0		0		0		0		0		0
Other	0		0		0		0		8		1		9		0		0		(2)		0
Ending balance at original discount rate	47,677		27,566		32,800		5,940		3,391		2,636		12,846		2,300		532		1,778		624
Effect of changes in discount rate assumptions	7,089		(147)		(846)		(358)		(293)		(191)		(1,357)		(226)		(44)		(252)		(2)
Balance at December 31, 2022	54,766		27,419		31,954		5,582		3,098		2,445		11,489		2,074		488		1,526		622
Net liability for future policy benefits	35,468		10,705		24,469		4,326		564		810		7,003		854		277		802		512
Less: reinsurance recoverable	0		1,579		0		0		0		0		0		0		0		9		0
Net liability for future policy benefits after    reinsurance recoverable	$	35,468	$	9,126	$	24,469	$	4,326	$	564	$	810	$	7,003	$	854	$	277	$	793	$	512

(1) Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected future benefit payments.

Schedule of Weighted-Average Interest Rate and Liability for Future Policy Benefit

The following tables present the weighted-average interest rates and weighted-average liability duration (calculated using the original discount rate) by reporting segment and disaggregated by product type as of December 31.

	2023
	Aflac Japan				Aflac U.S.
	Cancer	Medical and Other Health	Life Insurance	Other	Accident	Disability	Critical Care	Hospital Indemnity	Dental/Vision	Life Insurance	Other
Weighted-average interest, original discount rate (1)	3.9 %	2.6 %	2.1 %	1.8 %	3.9 %	4.2 %	4.6 %	4.4 %	4.3 %	3.7 %	5.4 %
Weighted-average interest, current discount rate (1)	1.8 %	2.3 %	1.7 %	2.1 %	5.3 %	5.3 %	5.3 %	5.3 %	5.3 %	5.3 %	5.3 %
Weighted-average liability duration (years)	13.1	24.9	16.3	17.3	8.1	5.6	11.3	9.3	7.9	13.6	9.4

(1) The weighted-average interest rates are calculated using the reserve balances as the weights. No adjustments were made to observable market information.

	2022
	Aflac Japan				Aflac U.S.
	Cancer	Medical and Other Health	Life Insurance	Other	Accident	Disability	Critical Care	Hospital Indemnity	Dental/Vision	Life Insurance	Other
Weighted-average interest, original discount rate (1)	4.1 %	2.6 %	2.1 %	1.8 %	3.8 %	4.2 %	4.6 %	4.4 %	4.3 %	3.7 %	5.4 %
Weighted-average interest, current discount rate (1)	1.6 %	2.2 %	1.6 %	1.9 %	4.8 %	4.7 %	4.8 %	4.8 %	4.8 %	4.8 %	4.8 %
Weighted-average liability duration (years)	13.7	26.9	17.3	18.2	8.5	5.6	12.0	9.4	8.1	13.1	9.6

(1) The weighted-average interest rates are calculated using the reserve balances as the weights. No adjustments were made to observable market information.

Reconciliation of Future Policy Benefits

The following table presents a reconciliation of the disaggregated rollforwards above to the ending future policy benefits presented in the consolidated balance sheets as of December 31. The deferred profit liability for limited-payment contracts and the deferred reinsurance gain liability are presented together with the liability for future policy benefits in the consolidated balance sheets and have been included as reconciling items in the table below.

(In millions)	2023			2022
Balances included in future policy benefits rollforward:
Aflac Japan
Cancer		$	32,652		$	35,468
Medical and other health		10,560			10,705
Life insurance		23,243			24,469
Other		4,090			4,326
Aflac U.S.
Accident		621			564
Disability		770			810
Critical care		7,216			7,003
Hospital indemnity		836			854
Dental/vision		272			277
Life insurance		911			802
Other		521			512
Corporate and other		4,225			686
Deferred profit liability		1,806			1,740
Deferred reinsurance gain liability		1,012			692
Intercompany eliminations (1)		(5,017)			(667)
Total		$	83,718		$	88,241

(1) Elimination entry necessary due to the internal reinsurance transactions with Aflac Re and to recapture a portion of policy liabilities ceded externally as a result of the reinsurance retrocession transaction. See Note 8 for additional details.

Summary of Net Earned Premiums Recognized

The following table summarizes the amount of net earned premiums recognized in the consolidated statements of earnings by reporting segment and disaggregated by product type for the years ended December 31.

(In millions)	2023		2022		2021
Net earned premiums:
Aflac Japan
Cancer	$	4,063	$	4,716	$	5,731
Medical and other health	2,631		2,917		3,570
Life insurance	1,532		1,769		2,282
Other	149		161		186
Aflac U.S.
Accident	1,288		1,317		1,366
Disability	1,256		1,179		1,170
Critical care	1,749		1,758		1,801
Hospital indemnity	725		725		733
Dental/vision	214		199		188
Life insurance	475		396		350
Other	45		38		42
Corporate and other	400		145		180
Reinsurance ceded	(404)		(419)		(504)
Total	$	14,123	$	14,901	$	17,095

Summary of Interest Expense Related to Insurance Contracts Recognized

The following table summarizes the amount of interest expense related to insurance contracts recognized in total benefits and claims, net in the consolidated statements of earnings by reporting segment and disaggregated by product type for the years ended December 31.

(In millions)	2023		2022		2021
Interest expense:
Aflac Japan
Cancer	$	1,061	$	1,140	$	1,428
Medical and other health	274		278		330
Life insurance	501		524		631
Other	80		84		102
Aflac U.S.
Accident	25		23		21
Disability	34		37		39
Critical care	345		346		343
Hospital indemnity	39		40		40
Dental/vision	13		12		13
Life insurance	37		35		33
Other	27		27		27
Total	$	2,436	$	2,546	$	3,007

Summary of Undiscounted and Discounted Expected Future Gross Premiums and Future Benefits and Expenses

The following tables summarize the amount of undiscounted expected future gross premiums and expected future policy benefits and expenses and discounted (discounted at the current period discount rate) expected future gross premiums and expected future policy benefits and expenses by reporting segment and disaggregated by product type as of December 31. These tables are presented gross of internal and external ceded reinsurance. Future gross premiums represent the expected amount of future premiums to be received. For limited-payment policies, the premiums are collected over a shorter period than the policy term over which benefits are provided. As a result, once the policy reaches premium paid-up status, the future gross premiums can be significantly less than the future benefit payments. Further, benefits and expenses are generally greater in the later years of a policy. These are the primary factors that result in future gross premiums lower than future benefit and expense payments for certain lines of business of the Company.

	2023						2022
(In millions)	Gross Premiums			Benefits and Expenses			Gross Premiums			Benefits and Expenses
Undiscounted expected future gross premiums   and expected future policy benefits and expenses:
Aflac Japan (1)
Cancer		$	59,169		$	66,427		$	65,454		$	73,009
Medical and other health		38,583			39,884			43,954			44,005
Life insurance		12,677			42,541			14,685			46,166
Other		1,781			7,448			2,012			8,175
Aflac U.S.
Accident		9,095			4,548			9,481			4,636
Disability		5,776			3,177			5,858			3,267
Critical care		19,886			20,626			21,069			22,113
Hospital indemnity		4,922			3,025			5,164			3,338
Dental/vision		1,162			726			1,208			759
Life insurance		2,719			3,260			2,375			2,787
Other		724			1,396			333			1,147
Total		$	156,494		$	193,058		$	171,593		$	209,402

(1) Prior-year amounts reflect the immaterial revision of amounts disclosed in the Company's Quarterly Reports on Form 10-Q for 2023 to correctly apply the yen/dollar exchange rate in effect for the period presented.

	2023						2022
(In millions)	Gross Premiums			Benefits and Expenses			Gross Premiums			Benefits and Expenses
Discounted expected future gross premiums   and expected future policy benefits and expenses:
Aflac Japan
Cancer		$	48,363		$	50,161		$	53,278		$	54,766
Medical and other health		30,757			25,257			34,693			27,419
Life insurance		11,240			29,731			12,951			31,954
Other		1,512			5,178			1,697			5,582
Aflac U.S.
Accident		6,369			3,109			6,510			3,098
Disability		4,488			2,422			4,468			2,445
Critical care		12,417			11,290			12,659			11,489
Hospital indemnity		3,419			1,943			3,483			2,074
Dental/vision		807			478			821			488
Life insurance		1,914			1,764			1,663			1,526
Other		467			798			228			622
Total		$	121,753		$	132,131		$	132,451		$	141,463

Schedule of Changes in Other Policyholders' Funds

The following table presents the changes in other policyholders’ funds for the years ended December 31.

(In millions)	2023		2022
Other policyholders' funds:
Fixed annuities account balance, beginning of period (1)	$	6,423	$	7,410
Premiums received	126		150
Transfers from WAYS conversions	229		214
Surrenders and withdrawals	(59)		(52)
Benefit payments	(419)		(367)
Interest credited	53		57
Foreign currency translation and other	(414)		(989)
Fixed annuities account balance, end of period	5,939		6,423
Other deposit type reserves	230		220
Total	$	6,169	$	6,643

(1) Aflac Japan fixed annuities

Schedule of Other Policyholders' Funds by Guaranteed Crediting Rates

The following table presents other policyholders’ funds balances by range of guaranteed crediting rates as of December 31.

	2023			2022
(In millions)	Range of Guaranteed Minimum Crediting Rates (2)	At Guaranteed Minimum	Cash Surrender Value	Range of Guaranteed Minimum Crediting Rates (2)	At Guaranteed Minimum	Cash Surrender Value
Fixed annuities (1)	0.5% - 2.3%	$5,939	$5,850	0.5% - 2.3%	$6,423	$6,326

(1) Aflac Japan fixed annuities

(2) Weighted-average crediting rate of 1.5% at December 31, 2023 and December 31, 2022.