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POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | $ 148,495 | $ 142,653
Benefits and Expenses | 181,215 | 173,393
Cancer | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 54,446 | 51,712
Benefits and Expenses | 59,903 | 56,881
Medical and other health | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 34,739 | 33,250
Benefits and Expenses | 36,751 | 34,864
Life insurance | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 11,492 | 10,915
Benefits and Expenses | 39,412 | 37,520
Life insurance | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 3,091 | 2,966
Benefits and Expenses | 3,686 | 3,559
Accident | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 8,843 | 8,862
Benefits and Expenses | 4,673 | 4,687
Disability | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 5,748 | 5,727
Benefits and Expenses | 3,110 | 3,094
Critical Care | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 19,780 | 19,624
Benefits and Expenses | 20,463 | 20,340
Hospital Indemnity | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 4,937 | 4,859
Benefits and Expenses | 3,052 | 3,017
Dental/Vision | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,117 | 1,118
Benefits and Expenses | 684 | 679
Other | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,538 | 1,477
Benefits and Expenses | 6,790 | 6,479
Other | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 2,764 | 2,143
Benefits and Expenses | $ 2,691 | $ 2,273

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