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DEFERRED POLICY ACQUISITION COSTS - Schedule Of Deferred Policy Acquisition Costs (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | $ 9,239 | $ 9,848 |
Capitalization | 1,086 | 1,052 |
Amortization expense | (816) | (792) | $ (835)
Foreign currency translation and other | (377) | (869) |
Balance, end of year | 9,132 | 9,239 | 9,848
Aflac Japan |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 5,776 |  |
Amortization expense | (326) | (338) | (393)
Balance, end of year | 5,559 | 5,776 |
Aflac Japan | Cancer |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 3,035 | 3,464 |
Capitalization | 317 | 291 |
Amortization expense | (184) | (188) |
Foreign currency translation and other | (197) | (532) |
Balance, end of year | 2,971 | 3,035 | 3,464
Aflac Japan | Medical and other health |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 2,161 | 2,372 |
Capitalization | 123 | 161 |
Amortization expense | (105) | (112) |
Foreign currency translation and other | (138) | (260) |
Balance, end of year | 2,041 | 2,161 | 2,372
Aflac Japan | Life insurance |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 525 | 595 |
Capitalization | 33 | 33 |
Amortization expense | (34) | (35) |
Foreign currency translation and other | (33) | (68) |
Balance, end of year | 491 | 525 | 595
Aflac Japan | Other |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 55 | 51 |
Capitalization | 8 | 12 |
Amortization expense | (3) | (3) |
Foreign currency translation and other | (4) | (5) |
Balance, end of year | 56 | 55 | 51
Aflac U.S. |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 3,463 |  |
Amortization expense | (490) | (455) | (442)
Balance, end of year | 3,573 | 3,463 |
Aflac U.S. | Life insurance |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 135 | 115 |
Capitalization | 61 | 40 |
Amortization expense | (24) | (20) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 172 | 135 | 115
Aflac U.S. | Accident |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 904 | 887 |
Capitalization | 151 | 147 |
Amortization expense | (138) | (130) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 917 | 904 | 887
Aflac U.S. | Disability |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 613 | 604 |
Capitalization | 125 | 117 |
Amortization expense | (113) | (108) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 625 | 613 | 604
Aflac U.S. | Critical care |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 1,304 | 1,270 |
Capitalization | 173 | 160 |
Amortization expense | (141) | (126) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 1,336 | 1,304 | 1,270
Aflac U.S. | Hospital indemnity |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 418 | 399 |
Capitalization | 84 | 80 |
Amortization expense | (66) | (61) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 436 | 418 | 399
Aflac U.S. | Dental/vision |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 88 | 90 |
Capitalization | 10 | 11 |
Amortization expense | (12) | (13) |
Foreign currency translation and other | 0 | 0 |
Balance, end of year | 86 | 88 | 90
Aflac U.S. | Other |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of year | 1 | 1 |
Capitalization | 1 | 0 |
Amortization expense | 4 | 4 |
Foreign currency translation and other | (5) | (4) |
Balance, end of year | $ 1 | $ 1 | $ 1

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