SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -Schedule of Impact from Adoption to AOCI and Retained Earnings (Details) - USD ($) $ in Millions		Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Total transition impact		$ (20,439)	$ (19,784)	$ (20,140)	$ (19,558)	$ (17,560)	$ (17,031)		$ (33,559)
Accumulated Other Comprehensive Income (Loss)
Total transition impact		7,338	7,278	6,429	6,980	8,451	8,411		(8,934)
Retained Earnings
Total transition impact		$ (46,937)	$ (45,555)	$ (44,367)	$ (43,150)	$ (42,010)	$ (40,963)		$ (37,984)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12
Total transition impact								$ 18,894
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss)
Impact to AOCI								23,507
Less: income taxes								4,937
Total transition impact								18,570
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Corporate and other
Impact to AOCI								218
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Cancer | Aflac Japan
Impact to AOCI								14,529
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Medical and other health | Aflac Japan
Impact to AOCI								2,382
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Life insurance | Aflac Japan
Impact to AOCI								3,314
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Life insurance | Aflac U.S.
Impact to AOCI								149
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Accident | Aflac U.S.
Impact to AOCI								92
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Disability | Aflac U.S.
Impact to AOCI								149
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Critical Care | Aflac U.S.
Impact to AOCI								2,258
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Hospital Indemnity | Aflac U.S.
Impact to AOCI								223
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Dental/Vision | Aflac U.S.
Impact to AOCI								65
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Other | Reinsurance ceded
Impact to AOCI								(305)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss) | Other | Aflac U.S.
Impact to AOCI								433
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings
Impact to retained earnings								410
Less: income taxes								86
Total transition impact								324
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Corporate and other
Impact to retained earnings								2
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Cancer | Aflac Japan
Impact to retained earnings								0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Medical and other health | Aflac Japan
Impact to retained earnings								1
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Life insurance | Aflac Japan
Impact to retained earnings								0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Life insurance | Aflac U.S.
Impact to retained earnings								5
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Accident | Aflac U.S.
Impact to retained earnings								0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Disability | Aflac U.S.
Impact to retained earnings								0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Critical Care | Aflac U.S.
Impact to retained earnings								4
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Hospital Indemnity | Aflac U.S.
Impact to retained earnings								0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Dental/Vision | Aflac U.S.
Impact to retained earnings								0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Other | Reinsurance ceded
Impact to retained earnings								0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings | Other | Aflac U.S.
Impact to retained earnings	[1]							$ 398

[1] Impact to retained earnings is driven primarily by capping the Transition Date NPR on Care products.