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BUSINESS SEGMENT INFORMATION - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) segment | Jun. 30, 2024 USD ($) | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of reportable insurance business segments | segment |  |  |  | 2 |  |
Net earned premiums | [1] | $ 3,470 | $ 3,325 | $ 6,851 | $ 6,781 |
Aflac Re Bermuda |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net earned premiums |  | $ 178 | $ 128 | $ 356 | $ 264 |
Aflac Japan |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Percentage of the Company's total revenues |  | 54.00% | 56.00% | 54.00% | 56.00% |
Percentage of the Company's total assets |  | 77.00% |  | 77.00% |  | 77.00%
[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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