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POLICY LIABILITIES - Summary of Net Earned Premiums Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Reinsurance ceded |  | $ (91) | $ (66) | $ (179) | $ (135)
Net earned premiums | [1] | 3,470 | 3,325 | 6,851 | 6,781
Aflac Japan | Cancer |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 885 | 832 | 1,724 | 1,710
Aflac Japan | Medical and other health |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 557 | 570 | 1,086 | 1,175
Aflac Japan | Life insurance |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 328 | 316 | 644 | 655
Aflac Japan | Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 33 | 35 | 65 | 69
Aflac U.S. | Life insurance |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 170 | 141 | 339 | 279
Aflac U.S. | Accident |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 309 | 316 | 620 | 641
Aflac U.S. | Disability |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 354 | 332 | 706 | 665
Aflac U.S. | Critical Care |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 443 | 441 | 884 | 885
Aflac U.S. | Hospital Indemnity |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 183 | 182 | 367 | 367
Aflac U.S. | Dental/Vision |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 52 | 46 | 101 | 105
Aflac U.S. | Other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | 41 | 25 | 90 | 45
Corporate and other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Gross premiums |  | $ 206 | $ 155 | $ 404 | $ 320
[1] | Includes a gain (loss) of an immaterial amount and $(2) for the three-month periods and an immaterial amount and $(5) for the six-month periods ended June 30, 2025 and 2024, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.

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