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BUSINESS SEGMENT INFORMATION - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) segment | Sep. 30, 2024 USD ($) | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of reportable insurance business segments | segment |  |  |  | 2 |  |
Net earned premiums | [1] | $ 3,372 | $ 3,328 | $ 10,223 | $ 10,109 |
Aflac Re Bermuda |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net earned premiums |  | $ 173 | $ 132 | $ 529 | $ 396 |
Aflac Japan |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Percentage of the Company's total revenues |  | 53.00% | 55.00% | 53.00% | 56.00% |
Percentage of the Company's total assets |  | 77.00% |  | 77.00% |  | 77.00%
[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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