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REINSURANCE Additional Information (Detail)
$ in Millions, ¥ in Billions
1 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
Oct. 31, 2023
USD ($)
Jan. 31, 2023
USD ($)
Dec. 31, 2023
JPY (¥)
Dec. 31, 2022
USD ($)
Effects of Reinsurance [Line Items]          
Deferred reinsurance gain liability $ 175       $ 692
Reinsurance recoverable 183       912
Reinsurance recoverable, allowance for credit loss 10       $ 8
Aflac Re Bermuda | ALIJ          
Effects of Reinsurance [Line Items]          
Pretax loss on reinsurance novation $ (151)        
Ceded insurance, percentage   30.00% 28.00%    
Coinsurance, amount of reserves transferred   $ 1,900 $ 2,100    
Coinsurance, amount of assets transferred   $ 1,700 $ 1,900    
Reinsurer, Other | ALIJ          
Effects of Reinsurance [Line Items]          
Ceded insurance, percentage     1.50%    
Aflac Japan          
Effects of Reinsurance [Line Items]          
Committed reinsurance facility | ¥       ¥ 120