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POLICY LIABILITIES - Summary of Interest Expense Related to Insurance Contracts Recognized (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | $ 576 | $ 641
Cancer | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 246 | 285
Medical and other health | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 65 | 71
Life insurance | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 118 | 133
Life insurance | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 10 | 9
Accident | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 6 | 6
Disability | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 8 | 8
Critical Care | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 85 | 87
Hospital Indemnity | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 9 | 10
Dental/Vision | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 3 | 3
Other | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 19 | 22
Other | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | $ 7 | $ 7

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