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POLICY LIABILITIES - Schedule of Changes in Other Policyholders' Funds (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Policyholder Account Balance [Line Items] |  |  |
Total |  | $ 6,668 | $ 6,643
Aflac Japan |  |  |
Policyholder Account Balance [Line Items] |  |  |
Other deposit type reserves |  | 292 | 220
Total |  | 6,668 | 6,643
Aflac Japan | Fixed Annuity |  |  |
Policyholder Account Balance [Line Items] |  |  |
Beginning balance | [1] | 6,423 | 7,410
Premiums received | [1] | 39 | 150
Transfers from WAYS conversions | [1] | 58 | 214
Surrenders and withdrawals | [1] | (14) | (52)
Benefit payments | [1] | (104) | (367)
Interest credited | [1] | 14 | 57
Foreign currency translation and other | [1] | (40) | (989)
Ending balance | [1] | $ 6,376 | $ 6,423
[1] | Aflac Japan fixed annuities

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