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POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | $ 149,102 | $ 142,653
Benefits and Expenses | 180,123 | 173,393
Aflac Japan | Cancer |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 55,514 | 51,712
Benefits and Expenses | 58,013 | 56,881
Aflac Japan | Medical and other health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 34,838 | 33,250
Benefits and Expenses | 36,969 | 34,864
Aflac Japan | Life insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 11,332 | 10,915
Benefits and Expenses | 39,259 | 37,520
Aflac Japan | Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,451 | 1,477
Benefits and Expenses | 6,809 | 6,479
Aflac U.S. | Life insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 3,239 | 2,966
Benefits and Expenses | 3,840 | 3,559
Aflac U.S. | Accident |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 8,682 | 8,862
Benefits and Expenses | 4,727 | 4,687
Aflac U.S. | Disability |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 5,720 | 5,727
Benefits and Expenses | 3,039 | 3,094
Aflac U.S. | Critical Care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 19,350 | 19,624
Benefits and Expenses | 20,051 | 20,340
Aflac U.S. | Hospital Indemnity |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 4,819 | 4,859
Benefits and Expenses | 3,043 | 3,017
Aflac U.S. | Dental/Vision |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,091 | 1,118
Benefits and Expenses | 660 | 679
Aflac U.S. | Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 3,066 | 2,143
Benefits and Expenses | $ 3,713 | $ 2,273

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