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POLICY LIABILITIES - Summary of Interest Expense Related to Insurance Contracts Recognized (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | $ 641 | $ 710
Corporate and other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 0 | 0
Cancer | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 285 | 329
Medical and other health | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 71 | 80
Life insurance | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 133 | 149
Life insurance | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 9 | 8
Accident | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 6 | 5
Disability | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 8 | 9
Critical Care | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 87 | 86
Hospital Indemnity | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | 10 | 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 | 22 | 24
Other | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest expense | $ 7 | $ 7

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