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POLICY LIABILITIES - Summary of Net Earned Premiums Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Reinsurance ceded |  | $ (92) | $ (71) | $ (271) | $ (206)
Net earned premiums | [1] | 3,372 | 3,328 | 10,223 | 10,109
Aflac Japan | Cancer |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 850 | 885 | 2,574 | 2,595
Aflac Japan | Medical and other health |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 535 | 577 | 1,621 | 1,752
Aflac Japan | Life insurance |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 281 | 251 | 925 | 906
Aflac Japan | Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 34 | 35 | 99 | 104
Aflac U.S. | Life insurance |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 171 | 141 | 510 | 420
Aflac U.S. | Accident |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 305 | 314 | 925 | 955
Aflac U.S. | Disability |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 349 | 333 | 1,055 | 998
Aflac U.S. | Critical Care |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 439 | 439 | 1,323 | 1,324
Aflac U.S. | Hospital Indemnity |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 181 | 181 | 548 | 548
Aflac U.S. | Dental/Vision |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 52 | 54 | 153 | 159
Aflac U.S. | Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 53 | 29 | 143 | 75
Corporate and other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | $ 214 | $ 160 | $ 618 | $ 479
[1] | Includes a gain (loss) of $(55) and $(75) for the three-month periods and $(55) and $(80) for the nine-month periods ended September 30, 2025 and 2024, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.

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