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REINSURANCE - Additional Information (Details) $ in Millions, ¥ in Billions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 JPY (¥) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Effects of Reinsurance [Line Items] |  |  |
Percent change in spot yen/dollar exchange rate |  | (7.50%) |
Percent change in ceded reserves |  | (7.20%) |
Aflac Japan |  |  |
Effects of Reinsurance [Line Items] |  |  |
Committed reinsurance facility | ¥ | ¥ 120 |  |
Aflac Japan | Closed Block |  |  |
Effects of Reinsurance [Line Items] |  |  |
Reinsurance deferred profit liability |  | $ 900 | $ 1,000
Reinsurance recoverable |  | $ 962 | $ 1,000

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