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POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | $ 150,364 | $ 142,653
Benefits and Expenses | 185,069 | 173,393
Aflac Japan | Cancer |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 55,334 | 51,712
Benefits and Expenses | 61,226 | 56,881
Aflac Japan | Medical and other health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 35,449 | 33,250
Benefits and Expenses | 37,821 | 34,864
Aflac Japan | Life insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 11,752 | 10,915
Benefits and Expenses | 40,586 | 37,520
Aflac Japan | Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,558 | 1,477
Benefits and Expenses | 6,965 | 6,479
Aflac U.S. | Life insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 3,156 | 2,966
Benefits and Expenses | 3,786 | 3,559
Aflac U.S. | Accident |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 8,778 | 8,862
Benefits and Expenses | 4,647 | 4,687
Aflac U.S. | Disability |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 5,717 | 5,727
Benefits and Expenses | 3,097 | 3,094
Aflac U.S. | Critical Care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 19,693 | 19,624
Benefits and Expenses | 20,424 | 20,340
Aflac U.S. | Hospital Indemnity |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 4,906 | 4,859
Benefits and Expenses | 3,044 | 3,017
Aflac U.S. | Dental/Vision |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,113 | 1,118
Benefits and Expenses | 685 | 679
Aflac U.S. | Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 2,908 | 2,143
Benefits and Expenses | $ 2,788 | $ 2,273

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