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DEFERRED POLICY ACQUISITION COSTS - Schedule Of Deferred Policy Acquisition Costs (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | $ 9,132 | $ 9,239 |
Capitalization | 1,056 | 1,086 |
Amortization expense | (851) | (816) | $ (792)
Foreign currency translation and other | (579) | (377) |
Balance, end of year | 8,758 | 9,132 | 9,239
Aflac Japan |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 5,559 |  |
Amortization expense | (321) | (326) | (338)
Balance, end of year | 5,102 | 5,559 |
Aflac Japan | Cancer |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 2,971 | 3,035 |
Capitalization | 300 | 317 |
Amortization expense | (184) | (184) |
Foreign currency translation and other | (311) | (197) |
Balance, end of year | 2,776 | 2,971 | 3,035
Aflac Japan | Medical and other health |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 2,041 | 2,161 |
Capitalization | 103 | 123 |
Amortization expense | (100) | (105) |
Foreign currency translation and other | (211) | (138) |
Balance, end of year | 1,833 | 2,041 | 2,161
Aflac Japan | Life insurance |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 491 | 525 |
Capitalization | 36 | 33 |
Amortization expense | (34) | (34) |
Foreign currency translation and other | (52) | (33) |
Balance, end of year | 441 | 491 | 525
Aflac Japan | Other |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 56 | 55 |
Capitalization | 4 | 8 |
Amortization expense | (3) | (3) |
Foreign currency translation and other | (5) | (4) |
Balance, end of year | 52 | 56 | 55
Aflac U.S. |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 3,573 |  |
Amortization expense | (530) | (490) | (455)
Balance, end of year | 3,656 | 3,573 |
Aflac U.S. | Life insurance |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 172 | 135 |
Capitalization | 77 | 61 |
Amortization expense | (30) | (24) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 219 | 172 | 135
Aflac U.S. | Accident |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 917 | 904 |
Capitalization | 141 | 151 |
Amortization expense | (143) | (138) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 915 | 917 | 904
Aflac U.S. | Disability |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 625 | 613 |
Capitalization | 129 | 125 |
Amortization expense | (118) | (113) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 636 | 625 | 613
Aflac U.S. | Critical care |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 1,336 | 1,304 |
Capitalization | 165 | 173 |
Amortization expense | (153) | (141) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 1,348 | 1,336 | 1,304
Aflac U.S. | Hospital indemnity |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 436 | 418 |
Capitalization | 89 | 84 |
Amortization expense | (73) | (66) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 452 | 436 | 418
Aflac U.S. | Dental/vision |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 86 | 88 |
Capitalization | 12 | 10 |
Amortization expense | (12) | (12) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 86 | 86 | 88
Aflac U.S. | Other |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 1 | 1 |
Capitalization | 0 | 1 |
Amortization expense | (1) | 4 |
Foreign currency translation and other | 0 | (5) |
Balance, end of year | $ 0 | $ 1 | $ 1

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