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Reinsurance - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 18, 2020
USD ($)
Jun. 30, 2023
USD ($)
treaty
Dec. 31, 2022
USD ($)
Jun. 01, 2020
USD ($)
Effects of Reinsurance [Line Items]        
Reinsurance recoverable, allowance for credit losses   $ 39 $ 15  
Athene | Letter of credit        
Effects of Reinsurance [Line Items]        
Maximum borrowing capacity       $ 1,200
Trust account assets   $ 135    
Athene        
Effects of Reinsurance [Line Items]        
Reinsurance quota share basis 100.00%      
Reinsurance agreement, ceding commission $ 1,200      
SRZ        
Effects of Reinsurance [Line Items]        
Number of retro treaties | treaty   3    
Coinsurance percentage   100.00%