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Investments (Fixed Maturity Securities - Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, estimated fair value $ 75,605 $ 69,977
Fixed maturity securities, allowance for credit losses $ 4 0
Fixed maturity securities with allowance for credit losses, number of securities 16  
Fixed maturity securities, total write-offs $ 13  
Fixed maturity securities    
Debt Securities, Available-for-sale [Line Items]    
Accrued interest receivable 496  
Non-Income Producing    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, estimated fair value $ 1 $ 0