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POLICY LIABILITIES - Summary of Interest Expense Related to Insurance Contracts Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | $ 576 | $ 565 | $ 1,135 | $ 1,141
Aflac Japan | Cancer |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 241 | 237 | 474 | 483
Aflac Japan | Medical and other health |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 69 | 66 | 135 | 131
Aflac Japan | Life insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 116 | 114 | 230 | 232
Aflac Japan | Other |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 20 | 18 | 38 | 37
Aflac U.S. | Life insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 12 | 10 | 23 | 20
Aflac U.S. | Accident |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 6 | 7 | 13 | 13
Aflac U.S. | Disability |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 8 | 8 | 15 | 16
Aflac U.S. | Critical Care |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 85 | 86 | 170 | 171
Aflac U.S. | Hospital Indemnity |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 10 | 10 | 19 | 19
Aflac U.S. | Dental/Vision |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 3 | 3 | 6 | 6
Aflac U.S. | Other |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | $ 6 | $ 6 | $ 12 | $ 13

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