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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 29 $ 13
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 1,720 $ 1,517
Derivative Average Remaining Maturity [1],[3] 7 years 4 months 24 days 5 years 7 months 6 days
Standard Poors AAA To A Minus Ratings [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 26 $ 11
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 492 $ 287
Derivative Average Remaining Maturity [1],[3] 17 years 9 months 18 days 15 years
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 26 $ 11
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 492 $ 287
Derivative Average Remaining Maturity [1],[3] 17 years 9 months 18 days 15 years
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 2 $ 2
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 230 $ 232
Derivative Average Remaining Maturity [1],[3] 1 year 8 months 12 days 1 year 7 months 6 days
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 1 $ 0
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 988 $ 988
Derivative Average Remaining Maturity [1],[3] 3 years 8 months 12 days 3 years 10 months 24 days
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 3 $ 2
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 1,218 $ 1,220
Derivative Average Remaining Maturity [1],[3] 3 years 3 months 18 days 3 years 6 months
Standard & Poor's, BB Rating [Member]    
Credit Derivatives [Line Items]    
Derivative Average Remaining Maturity [1],[2] 6 months 8 months 12 days
Standard & Poor's, BB Rating [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 0 $ 0
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] 10 10
Standard & Poor's, BB Rating [Member] | Credit Default Subtotal [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] 0 0
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 10 $ 10
[1] The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).
[2] Assumes the value of the referenced credit obligations is zero.
[3] The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.