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Reinsurance Reinsurance - Transactions (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Effects of Reinsurance [Line Items]          
Liabilities assumed $ 243,667   $ 212,968    
Less: Assets received 246,047   235,149    
DAC 1,123 $ 0 3,615 $ 3,236 $ 3,274
Policyholder Contract Deposit 173,653   156,325    
Future policy benefits $ (55,328)   $ (42,488)    
Reinsurance agreement          
Effects of Reinsurance [Line Items]          
Liabilities assumed       27,439  
Less: Assets received       28,805  
Net cost of reinsurance       (1,366)  
Policyholder Contract Deposit       $ 1,366