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DEFERRED POLICY ACQUISITION COSTS - Schedule Of Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | $ 9,132 | $ 9,239 | $ 9,239
Capitalization |  |  | 508 |  | 1,086
Amortization expense | $ (208) | $ (202) | (424) | (407) | (816)
Foreign currency translation and other |  |  | (666) |  | (377)
Balance, end of period | 8,550 |  | 8,550 |  | 9,132
Aflac Japan | Cancer |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 2,971 | 3,035 | 3,035
Capitalization |  |  | 146 |  | 317
Amortization expense |  |  | (92) |  | (184)
Foreign currency translation and other |  |  | (358) |  | (197)
Balance, end of period | 2,667 |  | 2,667 |  | 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 |  |  | 55 |  | 123
Amortization expense |  |  | (50) |  | (105)
Foreign currency translation and other |  |  | (244) |  | (138)
Balance, end of period | 1,802 |  | 1,802 |  | 2,041
Aflac Japan | Life insurance |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 491 | 525 | 525
Capitalization |  |  | 15 |  | 33
Amortization expense |  |  | (16) |  | (34)
Foreign currency translation and other |  |  | (58) |  | (33)
Balance, end of period | 432 |  | 432 |  | 491
Aflac Japan | Other |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 56 | 55 | 55
Capitalization |  |  | 2 |  | 8
Amortization expense |  |  | (2) |  | (3)
Foreign currency translation and other |  |  | (6) |  | (4)
Balance, end of period | 50 |  | 50 |  | 56
Aflac U.S. | Life insurance |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 172 | 135 | 135
Capitalization |  |  | 31 |  | 61
Amortization expense |  |  | (14) |  | (24)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | 189 |  | 189 |  | 172
Aflac U.S. | Accident |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 917 | 904 | 904
Capitalization |  |  | 68 |  | 151
Amortization expense |  |  | (72) |  | (138)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | 913 |  | 913 |  | 917
Aflac U.S. | Disability |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 625 | 613 | 613
Capitalization |  |  | 62 |  | 125
Amortization expense |  |  | (59) |  | (113)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | 628 |  | 628 |  | 625
Aflac U.S. | Critical Care |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 1,336 | 1,304 | 1,304
Capitalization |  |  | 81 |  | 173
Amortization expense |  |  | (77) |  | (141)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | 1,340 |  | 1,340 |  | 1,336
Aflac U.S. | Hospital Indemnity |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 436 | 418 | 418
Capitalization |  |  | 41 |  | 84
Amortization expense |  |  | (36) |  | (66)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | 441 |  | 441 |  | 436
Aflac U.S. | Dental/Vision |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 86 | 88 | 88
Capitalization |  |  | 6 |  | 10
Amortization expense |  |  | (6) |  | (12)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | 86 |  | 86 |  | 86
Aflac U.S. | Other |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 1 | $ 1 | 1
Capitalization |  |  | 1 |  | 1
Amortization expense |  |  | 0 |  | 4
Foreign currency translation and other |  |  | 0 |  | (5)
Balance, end of period | $ 2 |  | $ 2 |  | $ 1

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