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POLICY LIABILITIES - Schedule of Other Policyholders' Funds by Guaranteed Crediting Rates (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Policyholder Account Balance, Weighted Average Crediting Rate | 1.50% | 1.50% |
Aflac Japan | Fixed Annuity |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
At Guaranteed Minimum | $ 5,939 | $ 6,423 | $ 7,410
Cash Surrender Value | $ 5,850 | $ 6,326 |
Lower Limit | Aflac Japan | Fixed Annuity |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Guaranteed Minimum Crediting Rates | 0.50% | 0.50% |
Upper Limit | Aflac Japan | Fixed Annuity |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |
Guaranteed Minimum Crediting Rates | 2.30% | 2.30% |

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