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DEFERRED POLICY ACQUISITION COSTS - Schedule Of Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | $ 8,758 | $ 9,132 | $ 9,132
Capitalization |  |  | 796 |  | 1,056
Amortization expense | $ (218) | $ (214) | (655) | (638) | (851)
Foreign currency translation and other |  |  | 317 |  | (579)
Balance, end of period | 9,216 |  | 9,216 |  | 8,758
Aflac Japan | Cancer |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 2,776 | 2,971 | 2,971
Capitalization |  |  | 256 |  | 300
Amortization expense |  |  | (143) |  | (184)
Foreign currency translation and other |  |  | 172 |  | (311)
Balance, end of period | 3,061 |  | 3,061 |  | 2,776
Aflac Japan | Medical and other health |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 1,833 | 2,041 | 2,041
Capitalization |  |  | 67 |  | 103
Amortization expense |  |  | (75) |  | (100)
Foreign currency translation and other |  |  | 115 |  | (211)
Balance, end of period | 1,940 |  | 1,940 |  | 1,833
Aflac Japan | Life insurance |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 441 | 491 | 491
Capitalization |  |  | 24 |  | 36
Amortization expense |  |  | (25) |  | (34)
Foreign currency translation and other |  |  | 28 |  | (52)
Balance, end of period | 468 |  | 468 |  | 441
Aflac Japan | Other |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 52 | 56 | 56
Capitalization |  |  | 2 |  | 4
Amortization expense |  |  | (2) |  | (3)
Foreign currency translation and other |  |  | 2 |  | (5)
Balance, end of period | 54 |  | 54 |  | 52
Aflac U.S. | Life insurance |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 219 | 172 | 172
Capitalization |  |  | 70 |  | 77
Amortization expense |  |  | (29) |  | (30)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | 260 |  | 260 |  | 219
Aflac U.S. | Accident |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 915 | 917 | 917
Capitalization |  |  | 98 |  | 141
Amortization expense |  |  | (107) |  | (143)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | 906 |  | 906 |  | 915
Aflac U.S. | Disability |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 636 | 625 | 625
Capitalization |  |  | 91 |  | 129
Amortization expense |  |  | (91) |  | (118)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | 636 |  | 636 |  | 636
Aflac U.S. | Critical Care |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 1,348 | 1,336 | 1,336
Capitalization |  |  | 116 |  | 165
Amortization expense |  |  | (116) |  | (153)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | 1,348 |  | 1,348 |  | 1,348
Aflac U.S. | Hospital Indemnity |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 452 | 436 | 436
Capitalization |  |  | 63 |  | 89
Amortization expense |  |  | (58) |  | (73)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | 457 |  | 457 |  | 452
Aflac U.S. | Dental/Vision |  |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |  |
Balance, beginning of period |  |  | 86 | 86 | 86
Capitalization |  |  | 9 |  | 12
Amortization expense |  |  | (9) |  | (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 |  |  | 0 | $ 1 | 1
Capitalization |  |  | 0 |  | 0
Amortization expense |  |  | 0 |  | (1)
Foreign currency translation and other |  |  | 0 |  | 0
Balance, end of period | $ 0 |  | $ 0 |  | $ 0

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