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POLICY LIABILITIES - Schedule of Changes in Other Policyholders' Funds (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Policyholder Account Balance [Line Items] |  |
Other deposit type reserves | $ 230 | $ 220
Total | 6,169 | 6,643
Aflac Japan |  |
Policyholder Account Balance [Line Items] |  |
Total | 6,169 | 6,639
Aflac Japan | Fixed Annuity |  |
Policyholder Account Balance [Line Items] |  |
Beginning balance | 6,423 | 7,410
Premiums received | 126 | 150
Transfers from WAYS conversions | 229 | 214
Surrenders and withdrawals | (59) | (52)
Benefit payments | (419) | (367)
Interest credited | 53 | 57
Foreign currency translation and other | (414) | (989)
Ending balance | $ 5,939 | $ 6,423

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