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POLICY LIABILITIES - Summary of Interest Expense Related to Insurance Contracts Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | $ 568 | $ 603 | $ 1,703 | $ 1,744
Aflac Japan | Cancer |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 236 | 257 | 710 | 740
Aflac Japan | Medical and other health |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 69 | 71 | 204 | 202
Aflac Japan | Life insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 117 | 123 | 347 | 355
Aflac Japan | Other |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 19 | 20 | 57 | 57
Aflac U.S. | Life insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 11 | 11 | 34 | 31
Aflac U.S. | Accident |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 7 | 7 | 20 | 20
Aflac U.S. | Disability |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 8 | 9 | 23 | 25
Aflac U.S. | Critical Care |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 84 | 85 | 254 | 256
Aflac U.S. | Hospital Indemnity |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 9 | 10 | 28 | 29
Aflac U.S. | Dental/Vision |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 2 | 3 | 8 | 9
Aflac U.S. | Other |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | $ 6 | $ 7 | $ 18 | $ 20

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