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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | $ 568 | $ 563 | $ 1,838 | $ 1,929
Cancer | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 243 | 242 | 804 | 868
Medical and other health | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 63 | 59 | 206 | 210
Life insurance | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 115 | 112 | 378 | 397
Life insurance | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 8 | 9 | 27 | 26
Accident | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 6 | 6 | 18 | 18
Disability | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 8 | 9 | 26 | 27
Critical Care | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 86 | 87 | 259 | 259
Hospital Indemnity | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 10 | 11 | 30 | 31
Dental/Vision | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 3 | 3 | 9 | 10
Other | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 19 | 18 | 61 | 63
Other | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | $ 7 | $ 7 | $ 20 | $ 20

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