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POLICY LIABILITIES - Schedule of Other Policyholders' Funds by Guaranteed Crediting Rates (Details) - Aflac Japan - Fixed Annuity - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |
At Guaranteed Minimum | [1] | $ 5,643 | $ 5,221 | $ 5,939
Cash Surrender Value | [1] | $ 5,566 | $ 5,150 |
Weighted Average Crediting Rate |  | 1.50% | 1.50% |
Lower Limit |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |
Guaranteed Minimum Crediting Rates | [1],[2] | 0.50% | 0.50% |
Upper Limit |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |
Guaranteed Minimum Crediting Rates | [1],[2] | 2.20% | 2.20% |
[1] | Aflac Japan fixed annuities
[2] | Weighted-average crediting rate of 1.5% at June 30, 2025 and December 31, 2024.

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