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POLICY LIABILITIES - Schedule of Other Policyholders' Funds by Guaranteed Crediting Rates (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
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 | [1] | $ 5,538 | $ 5,939 | $ 6,423
Cash Surrender Value | [1] | $ 5,457 | $ 5,850 |
Lower Limit | Aflac Japan | Fixed Annuity |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |
Guaranteed Minimum Crediting Rates | [1],[2] | 0.50% | 0.50% |
Upper Limit | Aflac Japan | Fixed Annuity |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |
Guaranteed Minimum Crediting Rates | [1],[2] | 2.20% | 2.30% |
[1] | Aflac Japan fixed annuities
[2] | Weighted-average crediting rate of 1.5% at March 31, 2024 and December 31, 2023.

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