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Derivatives (Embedded Derivatives) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts $ 531   $ 531   $ 649
Nonperformance Risk [Member]          
Derivatives, Fair Value [Line Items]          
Net derivatives gains (losses) 18 $ (8) 4 $ (51)  
Ceded guaranteed minimum benefits | Premiums, reinsurance and other receivables          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within asset host contracts 35   35   38
Direct guaranteed minimum benefits | Policyholder account balances          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts 317   317   324
Assumed guaranteed minimum benefits | Policyholder account balances          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts 97   97   98
Funds withheld and guarantees on reinsurance | Other liabilities          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts         57
Fixed annuities with equity indexed returns [Member] | Policyholder account balances          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts 142   142   165
Other guarantees | Policyholder account balances          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts 0   0   $ 5
Funds withheld and guarantees on reinsurance | Other liabilities          
Derivatives, Fair Value [Line Items]          
Embedded derivatives within liability host contracts $ (25)   $ (25)