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Investments (Credit Loss Expense Incurred) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]        
Gross credit loss expense recognized in net income (loss) $ (4) $ 1 $ (5) $ (1)
Net credit loss expense recognized in net income (loss) (4) 1 (5) (1)
Corporate Bonds [Member]        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]        
Gross credit loss expense recognized in net income (loss) (3) $ 1 (2) $ (1)
RMBS [Member]        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]        
Gross credit loss expense recognized in net income (loss) $ (1)   (2)  
ABS [Member]        
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]        
Gross credit loss expense recognized in net income (loss)     $ (1)