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BUSINESS SEGMENT AND SELECTED FOREIGN CURRENCY TRANSLATION ITEMS - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable insurance business segments | segment |  | 2 |  |
Net earned premiums | [1] | $ 13,440 | $ 14,123 | $ 14,901
Receivables |  | 779 | 848 |
Premiums receivable, allowance for credit loss |  | 108 | 92 |
Aflac Re Bermuda |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net earned premiums |  | $ 568 | $ 258 | $ 1
Aflac Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of the Company's total revenues |  | 55.00% | 60.00% | 64.00%
Percentage of the Company's total assets |  | 77.00% | 80.00% |
Net earned premiums |  | $ 6,930 | $ 8,047 | $ 9,186
Receivables |  | $ 197 | $ 175 |
Percentage of total receivables related to Aflac Japan's operations |  | 25.30% | 20.70% |
[1] | Includes a gain (loss) of $(81), $20 and $(42) in 2024, 2023 and 2022, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.

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