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POLICY LIABILITIES - Schedule of Changes in Other Policyholders' Funds (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Policyholder Account Balance [Line Items] |  |  |
Other deposit type reserves |  | $ 330 | $ 239
Other policyholders’ funds |  | 5,785 | 5,460
Aflac Japan | Fixed Annuity |  |  |
Policyholder Account Balance [Line Items] |  |  |
Beginning balance | [1] | 5,221 | 5,939
Premiums received | [1] | 78 | 104
Transfers from WAYS conversions | [1] | 243 | 249
Surrenders and withdrawals | [1] | (50) | (58)
Benefit payments | [1] | (404) | (446)
Interest credited | [1] | 39 | 49
Foreign currency translation and other | [1] | 328 | (616)
Ending balance | [1] | $ 5,455 | $ 5,221
[1] | Aflac Japan fixed annuities

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