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POLICY LIABILITIES - Summary of Interest Expense Related to Insurance Contracts Recognized (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | $ 2,436 | $ 2,546 | $ 3,007
Cancer | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | 1,061 | 1,140 | 1,428
Medical and other health | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | 274 | 278 | 330
Life insurance | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | 501 | 524 | 631
Life insurance | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | 37 | 35 | 33
Accident | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | 25 | 23 | 21
Disability | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | 34 | 37 | 39
Critical care | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | 345 | 346 | 343
Hospital indemnity | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | 39 | 40 | 40
Dental/vision | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | 13 | 12 | 13
Other | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | 80 | 84 | 102
Other | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | $ 27 | $ 27 | $ 27

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