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POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Future Benefits and Expenses (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | $ 142,653 | $ 156,494
Benefits and Expenses | 173,393 | 193,058
Cancer | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 51,712 | 59,169
Benefits and Expenses | 56,881 | 66,427
Medical and other health | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 33,250 | 38,583
Benefits and Expenses | 34,864 | 39,884
Life insurance | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 10,915 | 12,677
Benefits and Expenses | 37,520 | 42,541
Life insurance | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 2,966 | 2,719
Benefits and Expenses | 3,559 | 3,260
Accident | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 8,862 | 9,095
Benefits and Expenses | 4,687 | 4,548
Disability | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 5,727 | 5,776
Benefits and Expenses | 3,094 | 3,177
Critical care | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 19,624 | 19,886
Benefits and Expenses | 20,340 | 20,626
Hospital indemnity | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 4,859 | 4,922
Benefits and Expenses | 3,017 | 3,025
Dental/vision | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,118 | 1,162
Benefits and Expenses | 679 | 726
Other | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,477 | 1,781
Benefits and Expenses | 6,479 | 7,448
Other | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 2,143 | 724
Benefits and Expenses | $ 2,273 | $ 1,396

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