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POLICY LIABILITIES - Summary of Net Earned Premiums Recognized (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | $ 13,440 | $ 14,123 | $ 14,901
Reinsurance ceded | (284) | (404) | (419)
Corporate and other |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 680 | 400 | 145
Cancer | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 3,545 | 4,063 | 4,716
Medical and other health | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 2,181 | 2,631 | 2,917
Life insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Reinsurance ceded | (51) | (52) | (35)
Life insurance | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 1,225 | 1,532 | 1,769
Life insurance | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 565 | 475 | 396
Accident | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 1,265 | 1,288 | 1,317
Disability | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 1,327 | 1,256 | 1,179
Critical care | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 1,763 | 1,749 | 1,758
Hospital indemnity | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 727 | 725 | 725
Dental/vision | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 202 | 214 | 199
Other | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 134 | 149 | 161
Other | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | $ 110 | $ 45 | $ 38

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