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Investments (Credit Loss Expense Incurred) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Gross credit loss expense recognized in net income (loss) $ (1) $ (2)
Net credit loss expense recognized in net income (loss) (1) (2)
Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Gross credit loss expense recognized in net income (loss) 1 $ (2)
RMBS [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Gross credit loss expense recognized in net income (loss) (1)  
ABS [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Gross credit loss expense recognized in net income (loss) $ (1)