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POLICY LIABILITIES - Summary of Net Earned Premiums Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums | [1] | $ 3,476 | $ 3,535 | $ 10,737 | $ 11,379
Reinsurance ceded |  | (99) | (99) | (309) | (321)
Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums | [1] | 1,973 | 2,125 | 6,207 | 7,084
Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 1,419 | 1,375 | 4,272 | 4,182
Corporate and other |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 83 | 35 | 258 | 112
Cancer | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 1,004 | 1,106 | 3,154 | 3,640
Medical and other health | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 640 | 690 | 2,018 | 2,253
Life insurance | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 371 | 377 | 1,183 | 1,360
Life insurance | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 122 | 99 | 351 | 297
Accident | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 320 | 324 | 973 | 990
Disability | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 315 | 293 | 941 | 882
Critical Care | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 436 | 434 | 1,317 | 1,319
Hospital Indemnity | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 180 | 178 | 547 | 546
Dental/Vision | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 53 | 50 | 160 | 148
Other | Aflac Japan |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | 38 | 39 | 113 | 124
Other | Aflac U.S. |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Net earned premiums |  | $ 13 | $ 9 | $ 31 | $ 29
[1] | Includes a gain (loss) of $22 and $(41) for the three-month periods and $22 and $(42) for the nine-month periods ended September 30, 2023 and 2022, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.

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