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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | $ 565 | $ 629 | $ 1,141 | $ 1,270
Cancer | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 237 | 276 | 483 | 561
Medical and other health | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 66 | 72 | 131 | 143
Life insurance | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 114 | 130 | 232 | 263
Life insurance | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 10 | 10 | 20 | 19
Accident | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 7 | 6 | 13 | 12
Disability | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 8 | 10 | 16 | 18
Critical Care | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 86 | 86 | 171 | 173
Hospital Indemnity | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 10 | 10 | 19 | 20
Dental/Vision | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 3 | 3 | 6 | 6
Other | Aflac Japan |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | 18 | 20 | 37 | 42
Other | Aflac U.S. |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Interest expense | $ 6 | $ 6 | $ 13 | $ 13

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