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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Future Policy Benefits (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | $ 85,904 | $ 88,241 |
Deferred profit liability - limited-payment contracts | 1,697 | 1,740 |
Deferred profit liability - reinsurance | 620 | 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 profit liability - reinsurance |  |  | 859
Corporate and other |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 2,696 | 686 |
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 | 33,719 | 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 | 10,895 | 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 | 23,692 | 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 | 850 | 802 |
Life insurance | Aflac U.S. | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 1,009
Accident | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 590 | 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 | 795 | 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 | 7,138 | 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 | 869 | 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 | 275 | 277 |
Dental/Vision | Aflac U.S. | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | 352
Other | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 4,231 | 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 | $ 517 | $ 512 |
Other | Aflac U.S. | Accounting Standards Update 2018-12 |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits |  |  | $ 684

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