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REINSURANCE - Additional Information (Details)
$ in Millions, ¥ in Billions
3 Months Ended
Mar. 31, 2019
JPY (¥)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Effects of Reinsurance [Line Items]      
Percent change in ceded reserves   0.30%  
Aflac Japan      
Effects of Reinsurance [Line Items]      
Committed reinsurance facility | ¥ ¥ 110    
Aflac Japan | Closed Block      
Effects of Reinsurance [Line Items]      
Reinsurance deferred profit liability   $ 1,000  
Reinsurance recoverable   $ 944 $ 941