POLICY LIABILITIES - Reconciliation of Future Policy Benefits (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Deferred profit liability - limited-payment contracts	$ 1,697	$ 1,740
Deferred profit liability - reinsurance	620	692
Future policy benefits	85,904	88,241
Intercompany Eliminations
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	(2,680)	(667)
Corporate and other
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	2,696	686
Cancer | Aflac Japan
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	33,719	35,468
Medical and other health | Aflac Japan
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	10,895	10,705
Life insurance | Aflac Japan
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	23,692	24,469
Life insurance | Aflac U.S.
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	850	802
Accident | Aflac U.S.
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	590	564
Disability | Aflac U.S.
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	795	810
Critical Care | Aflac U.S.
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	7,138	7,003
Hospital Indemnity | Aflac U.S.
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	869	854
Dental/Vision | Aflac U.S.
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	275	277
Other | Aflac Japan
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	4,231	4,326
Other | Aflac U.S.
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits	$ 517	$ 512