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Investments (Fixed Maturity Securities - Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, estimated fair value $ 81,502 $ 86,527
Fixed maturity securities, allowance for credit losses $ 11 11
Fixed maturity securities with allowance for credit losses, number of securities 7  
Fixed maturity securities, total write-offs $ 2  
Non-Income Producing    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, estimated fair value 44 3
Fixed maturity securities    
Debt Securities, Available-for-sale [Line Items]    
Accrued interest receivable $ 572 $ 527