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BUSINESS SEGMENT AND SELECTED FOREIGN CURRENCY TRANSLATION ITEMS - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Number of reportable insurance business segments | segment | 2 |  |
Total receivables related to Aflac Japan's operations | $ 848 | $ 647 |
Premiums receivable, allowance for credit loss | 92 | 79 |
Aflac Japan |  |  |
Segment Reporting Information [Line Items] |  |  |
Total receivables related to Aflac Japan's operations | $ 175 | $ 174 |
Percentage of total receivables related to Aflac Japan's operations | 20.70% | 27.00% |
Percentage of the Company's total revenues | 60.00% | 64.00% | 68.00%
Percentage of the Company's total assets | 80.00% | 80.00% |
Maximum | Machinery and equipment |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 20 years |  |
Maximum | Building |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 50 years |  |
Maximum | Furniture and fixtures |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 20 years |  |

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