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Investments (Fixed Maturity Securities - Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, estimated fair value $ 87,582 $ 82,495
Fixed maturity securities, allowance for credit losses $ 11 2
Fixed maturity securities with allowance for credit losses, number of securities 8  
Fixed maturity securities, total write-offs $ 5 13
Non-Income Producing    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, estimated fair value 3 5
Fixed maturity securities    
Debt Securities, Available-for-sale [Line Items]    
Accrued interest receivable $ 534 $ 514