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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Future Policy Benefits (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | $ 83,718 | $ 88,241 |
Deferred reinsurance gain liability | 175 | 692 |
Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | $ 115,964
Deferred profit liability - limited-payment contracts |  |  | 1,595
Deferred reinsurance gain liability |  |  | 859
Corporate and other | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 30
Cancer | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 32,652 | 35,468 |
Cancer | Aflac Japan | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 46,854
Medical and other health | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 10,560 | 10,705 |
Medical and other health | Aflac Japan | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 14,847
Life insurance | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 23,243 | 24,469 |
Life insurance | Aflac Japan | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 31,873
Life insurance | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 911 | 802 |
Life insurance | Aflac U.S. | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 1,009
Other | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 4,090 | 4,326 |
Other | Aflac Japan | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 5,736
Other | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 521 | 512 |
Other | Aflac U.S. | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 684
Accident | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 621 | 564 |
Accident | Aflac U.S. | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 666
Disability | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 770 | 810 |
Disability | Aflac U.S. | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 1,009
Critical care | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 7,216 | 7,003 |
Critical care | Aflac U.S. | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 9,365
Hospital indemnity | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 836 | 854 |
Hospital indemnity | Aflac U.S. | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 1,085
Dental/vision | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | $ 272 | $ 277 |
Dental/vision | Aflac U.S. | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | $ 352

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