POLICY LIABILITIES - Schedule of Changes in Present Value of Expected Net Premiums and Expected Future Policy Benefits (Details) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
		Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Present value of expected future policy benefits:
Beginning balance		$ 141,463
Ending balance		136,089	$ 141,463
Net liability for future policy benefits		85,904	88,241
Cancer | Aflac Japan
Present value of expected premiums:
Beginning balance		19,298	25,893
Beginning balance at original discount rate		18,221	22,470
Effect of changes in cash flow assumptions			0	$ (639)
Effect of actual variances from expected experience			(198)	(284)
Adjusted beginning of period balance			18,023	21,547
Issuances		498	947
Interest accrual		218	459
Net premium earned	[1]	(824)	(1,734)
Foreign currency translation		(1,521)	(2,997)
Other		0	(1)
Ending balance at original discount rate		16,394	18,221	22,470
Effect of changes in discount rate assumptions		1,579	1,077
Ending balance		17,973	19,298	25,893
Present value of expected future policy benefits:
Beginning balance		54,766	72,747
Beginning balance at original discount rate		47,677	56,807
Effect of changes in cash flow assumptions			0	(721)
Effect of actual variances from expected experience			(232)	(333)
Adjusted beginning of period balance			47,445	55,753
Issuances		509	960
Interest accrual		779	1,599
Benefit payments		(1,592)	(3,050)
Foreign currency translation		(4,000)	(7,585)
Other		0	0
Ending balance at original discount rate		43,141	47,677	56,807
Effect of changes in discount rate assumptions		8,551	7,089
Ending balance		51,692	54,766	72,747
Net liability for future policy benefits		33,719	35,468
Less: reinsurance recoverable		2,130	0
Net liability for future policy benefits after reinsurance recoverable		31,589	35,468
Medical and other health | Aflac Japan
Present value of expected premiums:
Beginning balance		16,714	21,174
Beginning balance at original discount rate		16,195	18,681
Effect of changes in cash flow assumptions			0	317
Effect of actual variances from expected experience			(61)	61
Adjusted beginning of period balance			16,134	19,059
Issuances		204	639
Interest accrual		180	364
Net premium earned	[1]	(673)	(1,376)
Foreign currency translation		(1,348)	(2,488)
Other		0	(3)
Ending balance at original discount rate		14,497	16,195	18,681
Effect of changes in discount rate assumptions		1,135	519
Ending balance		15,632	16,714	21,174
Present value of expected future policy benefits:
Beginning balance		27,419	36,021
Beginning balance at original discount rate		27,566	31,398
Effect of changes in cash flow assumptions			0	352
Effect of actual variances from expected experience			(65)	83
Adjusted beginning of period balance			27,501	31,833
Issuances		211	646
Interest accrual		323	642
Benefit payments		(647)	(1,375)
Foreign currency translation		(2,323)	(4,180)
Other		0	0
Ending balance at original discount rate		25,065	27,566	31,398
Effect of changes in discount rate assumptions		1,462	(147)
Ending balance		26,527	27,419	36,021
Net liability for future policy benefits		10,895	10,705
Less: reinsurance recoverable		1,580	1,579
Net liability for future policy benefits after reinsurance recoverable		9,315	9,126
Life insurance | Aflac Japan
Present value of expected premiums:
Beginning balance		7,485	10,847
Beginning balance at original discount rate		7,284	10,064
Effect of changes in cash flow assumptions			0	(494)
Effect of actual variances from expected experience			(22)	(81)
Adjusted beginning of period balance			7,262	9,489
Issuances		198	221
Interest accrual		66	146
Net premium earned	[1]	(549)	(1,229)
Foreign currency translation		(597)	(1,343)
Other		0	0
Ending balance at original discount rate		6,380	7,284	10,064
Effect of changes in discount rate assumptions		335	201
Ending balance		6,715	7,485	10,847
Present value of expected future policy benefits:
Beginning balance		31,954	42,720
Beginning balance at original discount rate		32,800	39,002
Effect of changes in cash flow assumptions			0	(550)
Effect of actual variances from expected experience			(26)	(91)
Adjusted beginning of period balance			32,774	38,361
Issuances		201	222
Interest accrual		329	670
Benefit payments		(808)	(1,248)
Foreign currency translation		(2,759)	(5,205)
Other		0	0
Ending balance at original discount rate		29,737	32,800	39,002
Effect of changes in discount rate assumptions		670	(846)
Ending balance		30,407	31,954	42,720
Net liability for future policy benefits		23,692	24,469
Less: reinsurance recoverable		0	0
Net liability for future policy benefits after reinsurance recoverable		23,692	24,469
Life insurance | Aflac U.S.
Present value of expected premiums:
Beginning balance		724	834
Beginning balance at original discount rate		799	780
Effect of changes in cash flow assumptions			0	(1)
Effect of actual variances from expected experience			(9)	(16)
Adjusted beginning of period balance			790	763
Issuances		90	146
Interest accrual		14	27
Net premium earned	[1]	(65)	(131)
Foreign currency translation		0	0
Other		2	(6)
Ending balance at original discount rate		831	799	780
Effect of changes in discount rate assumptions		(68)	(75)
Ending balance		763	724	834
Present value of expected future policy benefits:
Beginning balance		1,526	1,843
Beginning balance at original discount rate		1,778	1,694
Effect of changes in cash flow assumptions			0	(1)
Effect of actual variances from expected experience			(12)	(21)
Adjusted beginning of period balance			1,766	1,672
Issuances		94	149
Interest accrual		33	62
Benefit payments		(56)	(103)
Foreign currency translation		0	0
Other		4	(2)
Ending balance at original discount rate		1,841	1,778	1,694
Effect of changes in discount rate assumptions		(228)	(252)
Ending balance		1,613	1,526	1,843
Net liability for future policy benefits		850	802
Less: reinsurance recoverable		11	9
Net liability for future policy benefits after reinsurance recoverable		839	793
Accident | Aflac U.S.
Present value of expected premiums:
Beginning balance		2,534	3,283
Beginning balance at original discount rate		2,760	2,999
Effect of changes in cash flow assumptions			0	(52)
Effect of actual variances from expected experience			(51)	(152)
Adjusted beginning of period balance			2,709	2,795
Issuances		185	355
Interest accrual		51	105
Net premium earned	[1]	(237)	(496)
Foreign currency translation		0	0
Other		(3)	1
Ending balance at original discount rate		2,705	2,760	2,999
Effect of changes in discount rate assumptions		(201)	(226)
Ending balance		2,504	2,534	3,283
Present value of expected future policy benefits:
Beginning balance		3,098	3,949
Beginning balance at original discount rate		3,391	3,594
Effect of changes in cash flow assumptions			0	(70)
Effect of actual variances from expected experience			(65)	(177)
Adjusted beginning of period balance			3,326	3,347
Issuances		194	364
Interest accrual		63	128
Benefit payments		(225)	(456)
Foreign currency translation		0	0
Other		0	8
Ending balance at original discount rate		3,358	3,391	3,594
Effect of changes in discount rate assumptions		(264)	(293)
Ending balance		3,094	3,098	3,949
Net liability for future policy benefits		590	564
Less: reinsurance recoverable		0	0
Net liability for future policy benefits after reinsurance recoverable		590	564
Disability | Aflac U.S.
Present value of expected premiums:
Beginning balance		1,635	1,862
Beginning balance at original discount rate		1,775	1,760
Effect of changes in cash flow assumptions			0	5
Effect of actual variances from expected experience			(15)	(43)
Adjusted beginning of period balance			1,760	1,722
Issuances		204	384
Interest accrual		30	57
Net premium earned	[1]	(193)	(382)
Foreign currency translation		0	0
Other		(3)	(6)
Ending balance at original discount rate		1,798	1,775	1,760
Effect of changes in discount rate assumptions		(129)	(140)
Ending balance		1,669	1,635	1,862
Present value of expected future policy benefits:
Beginning balance		2,445	2,871
Beginning balance at original discount rate		2,636	2,670
Effect of changes in cash flow assumptions			0	5
Effect of actual variances from expected experience			(23)	(48)
Adjusted beginning of period balance			2,613	2,627
Issuances		212	397
Interest accrual		48	94
Benefit payments		(233)	(483)
Foreign currency translation		0	0
Other		0	1
Ending balance at original discount rate		2,640	2,636	2,670
Effect of changes in discount rate assumptions		(176)	(191)
Ending balance		2,464	2,445	2,871
Net liability for future policy benefits		795	810
Less: reinsurance recoverable		0	0
Net liability for future policy benefits after reinsurance recoverable		795	810
Critical Care | Aflac U.S.
Present value of expected premiums:
Beginning balance		4,486	6,023
Beginning balance at original discount rate		5,050	5,391
Effect of changes in cash flow assumptions			0	(38)
Effect of actual variances from expected experience			(139)	(421)
Adjusted beginning of period balance			4,911	4,932
Issuances		291	537
Interest accrual		94	193
Net premium earned	[1]	(298)	(612)
Foreign currency translation		0	0
Other		(2)	0
Ending balance at original discount rate		4,996	5,050	5,391
Effect of changes in discount rate assumptions		(497)	(564)
Ending balance		4,499	4,486	6,023
Present value of expected future policy benefits:
Beginning balance		11,489	15,388
Beginning balance at original discount rate		12,846	13,079
Effect of changes in cash flow assumptions			0	(43)
Effect of actual variances from expected experience			(166)	(465)
Adjusted beginning of period balance			12,680	12,571
Issuances		302	550
Interest accrual		267	539
Benefit payments		(446)	(823)
Foreign currency translation		0	0
Other		0	9
Ending balance at original discount rate		12,803	12,846	13,079
Effect of changes in discount rate assumptions		(1,166)	(1,357)
Ending balance		11,637	11,489	15,388
Net liability for future policy benefits		7,138	7,003
Less: reinsurance recoverable		0	0
Net liability for future policy benefits after reinsurance recoverable		7,138	7,003
Hospital Indemnity | Aflac U.S.
Present value of expected premiums:
Beginning balance		1,220	1,467
Beginning balance at original discount rate		1,365	1,380
Effect of changes in cash flow assumptions			0	42
Effect of actual variances from expected experience			(44)	(111)
Adjusted beginning of period balance			1,321	1,311
Issuances		153	273
Interest accrual		23	45
Net premium earned	[1]	(127)	(261)
Foreign currency translation		0	0
Other		(1)	(3)
Ending balance at original discount rate		1,369	1,365	1,380
Effect of changes in discount rate assumptions		(129)	(145)
Ending balance		1,240	1,220	1,467
Present value of expected future policy benefits:
Beginning balance		2,074	2,552
Beginning balance at original discount rate		2,300	2,300
Effect of changes in cash flow assumptions			0	40
Effect of actual variances from expected experience			(58)	(130)
Adjusted beginning of period balance			2,242	2,210
Issuances		162	282
Interest accrual		43	85
Benefit payments		(137)	(277)
Foreign currency translation		0	0
Other		0	0
Ending balance at original discount rate		2,310	2,300	2,300
Effect of changes in discount rate assumptions		(201)	(226)
Ending balance		2,109	2,074	2,552
Net liability for future policy benefits		869	854
Less: reinsurance recoverable		0	0
Net liability for future policy benefits after reinsurance recoverable		869	854
Dental/Vision | Aflac U.S.
Present value of expected premiums:
Beginning balance		211	264
Beginning balance at original discount rate		231	241
Effect of changes in cash flow assumptions			0	10
Effect of actual variances from expected experience			(11)	(20)
Adjusted beginning of period balance			220	231
Issuances		20	33
Interest accrual		4	9
Net premium earned	[1]	(20)	(42)
Foreign currency translation		0	0
Other		2	0
Ending balance at original discount rate		226	231	241
Effect of changes in discount rate assumptions		(17)	(20)
Ending balance		209	211	264
Present value of expected future policy benefits:
Beginning balance		488	616
Beginning balance at original discount rate		532	549
Effect of changes in cash flow assumptions			0	13
Effect of actual variances from expected experience			(14)	(23)
Adjusted beginning of period balance			518	539
Issuances		23	34
Interest accrual		10	21
Benefit payments		(30)	(62)
Foreign currency translation		0	0
Other		2	0
Ending balance at original discount rate		523	532	549
Effect of changes in discount rate assumptions		(39)	(44)
Ending balance		484	488	616
Net liability for future policy benefits		275	277
Less: reinsurance recoverable		0	0
Net liability for future policy benefits after reinsurance recoverable		275	277
Other | Aflac Japan
Present value of expected premiums:
Beginning balance		1,256	1,586
Beginning balance at original discount rate		1,242	1,461
Effect of changes in cash flow assumptions			0	25
Effect of actual variances from expected experience			(5)	(10)
Adjusted beginning of period balance			1,237	1,476
Issuances		14	62
Interest accrual		11	22
Net premium earned	[1]	(60)	(123)
Foreign currency translation		(104)	(195)
Other		0	0
Ending balance at original discount rate		1,098	1,242	1,461
Effect of changes in discount rate assumptions		47	14
Ending balance		1,145	1,256	1,586
Present value of expected future policy benefits:
Beginning balance		5,582	7,322
Beginning balance at original discount rate		5,940	6,787
Effect of changes in cash flow assumptions			0	96
Effect of actual variances from expected experience			(2)	(10)
Adjusted beginning of period balance			5,938	6,873
Issuances		17	68
Interest accrual		53	106
Benefit payments		(107)	(202)
Foreign currency translation		(500)	(905)
Other		0	0
Ending balance at original discount rate		5,401	5,940	6,787
Effect of changes in discount rate assumptions		(25)	(358)
Ending balance		5,376	5,582	7,322
Net liability for future policy benefits		4,231	4,326
Less: reinsurance recoverable		0	0
Net liability for future policy benefits after reinsurance recoverable		4,231	4,326
Other | Aflac U.S.
Present value of expected premiums:
Beginning balance		110	153
Beginning balance at original discount rate		118	135
Effect of changes in cash flow assumptions			0	(12)
Effect of actual variances from expected experience			0	6
Adjusted beginning of period balance			118	129
Issuances		55	0
Interest accrual		3	5
Net premium earned	[1]	(8)	(17)
Foreign currency translation		0	0
Other		9	1
Ending balance at original discount rate		177	118	135
Effect of changes in discount rate assumptions		(8)	(8)
Ending balance		169	110	153
Present value of expected future policy benefits:
Beginning balance		622	837
Beginning balance at original discount rate		624	645
Effect of changes in cash flow assumptions			0	(15)
Effect of actual variances from expected experience			(1)	7
Adjusted beginning of period balance			623	637
Issuances		55	0
Interest accrual		16	32
Benefit payments		(23)	(45)
Foreign currency translation		0	0
Other		9	0
Ending balance at original discount rate		680	624	645
Effect of changes in discount rate assumptions		6	(2)
Ending balance		686	622	$ 837
Net liability for future policy benefits		517	512
Less: reinsurance recoverable		1	0
Net liability for future policy benefits after reinsurance recoverable		$ 516	$ 512

[1] Net premiums earned represent the portion of gross premiums collected from policyholders that is used to fund expected benefit payments.