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POLICY LIABILITIES - Summary of Discounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | $ 105,902 | $ 105,686 |
Benefits and Expenses | 107,596 | 111,508 |
Aflac Japan | Cancer |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 40,078 | 40,170 |
Benefits and Expenses | 38,261 | 40,781 | $ 50,161
Aflac Japan | Medical and other health |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 24,387 | 25,171 |
Benefits and Expenses | 19,391 | 20,606 | 25,257
Aflac Japan | Life insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 9,268 | 9,367 |
Benefits and Expenses | 22,758 | 24,265 | 29,731
Aflac Japan | Other |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,122 | 1,204 |
Benefits and Expenses | 4,025 | 4,225 | 5,178
Aflac U.S. | Life insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 2,298 | 2,050 |
Benefits and Expenses | 2,032 | 1,847 | 1,764
Aflac U.S. | Accident |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 6,097 | 6,057 |
Benefits and Expenses | 3,235 | 3,127 | 3,109
Aflac U.S. | Disability |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 4,495 | 4,404 |
Benefits and Expenses | 2,341 | 2,330 | 2,422
Aflac U.S. | Critical Care |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 12,138 | 11,900 |
Benefits and Expenses | 10,931 | 10,701 | 11,290
Aflac U.S. | Hospital Indemnity |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 3,390 | 3,312 |
Benefits and Expenses | 1,972 | 1,897 | 1,943
Aflac U.S. | Dental/Vision |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 762 | 761 |
Benefits and Expenses | 441 | 441 | 478
Aflac U.S. | Other |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,867 | 1,290 |
Benefits and Expenses | $ 2,209 | $ 1,288 | $ 798

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