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DEFERRED POLICY ACQUISITION COSTS - Schedule Of Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | $ 9,132 | $ 9,239 | $ 9,239
Capitalization | 254 |  | 1,086
Amortization expense | (215) | (205) | (816)
Foreign currency translation and other | (352) |  | (377)
Balance, end of period | 8,819 |  | 9,132
Aflac Japan | Cancer |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | 2,971 | 3,035 | 3,035
Capitalization | 72 |  | 317
Amortization expense | (49) |  | (184)
Foreign currency translation and other | (189) |  | (197)
Balance, end of period | 2,805 |  | 2,971
Aflac Japan | Medical and other health |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | 2,041 | 2,161 | 2,161
Capitalization | 29 |  | 123
Amortization expense | (25) |  | (105)
Foreign currency translation and other | (129) |  | (138)
Balance, end of period | 1,916 |  | 2,041
Aflac Japan | Life insurance |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | 491 | 525 | 525
Capitalization | 9 |  | 33
Amortization expense | (8) |  | (34)
Foreign currency translation and other | (32) |  | (33)
Balance, end of period | 460 |  | 491
Aflac Japan | Other |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | 56 | 55 | 55
Capitalization | 0 |  | 8
Amortization expense | (1) |  | (3)
Foreign currency translation and other | (2) |  | (4)
Balance, end of period | 53 |  | 56
Aflac U.S. | Life insurance |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | 172 | 135 | 135
Capitalization | 19 |  | 61
Amortization expense | (7) |  | (24)
Foreign currency translation and other | 0 |  | 0
Balance, end of period | 184 |  | 172
Aflac U.S. | Accident |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | 917 | 904 | 904
Capitalization | 32 |  | 151
Amortization expense | (36) |  | (138)
Foreign currency translation and other | 0 |  | 0
Balance, end of period | 913 |  | 917
Aflac U.S. | Disability |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | 625 | 613 | 613
Capitalization | 29 |  | 125
Amortization expense | (29) |  | (113)
Foreign currency translation and other | 0 |  | 0
Balance, end of period | 625 |  | 625
Aflac U.S. | Critical Care |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | 1,336 | 1,304 | 1,304
Capitalization | 39 |  | 173
Amortization expense | (38) |  | (141)
Foreign currency translation and other | 0 |  | 0
Balance, end of period | 1,337 |  | 1,336
Aflac U.S. | Hospital Indemnity |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | 436 | 418 | 418
Capitalization | 19 |  | 84
Amortization expense | (18) |  | (66)
Foreign currency translation and other | 0 |  | 0
Balance, end of period | 437 |  | 436
Aflac U.S. | Dental/Vision |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | 86 | 88 | 88
Capitalization | 4 |  | 10
Amortization expense | (4) |  | (12)
Foreign currency translation and other | 0 |  | 0
Balance, end of period | 86 |  | 86
Aflac U.S. | Other |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Balance, beginning of period | 1 | $ 1 | 1
Capitalization | 2 |  | 1
Amortization expense | 0 |  | 4
Foreign currency translation and other | 0 |  | (5)
Balance, end of period | $ 3 |  | $ 1

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