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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Credit Derivatives [Line Items]    
Document Period End Date Sep. 30, 2021  
Credit Derivative Current Fair Value [1] $ 20 $ 13
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 1,892 $ 1,517
Derivative Average Remaining Maturity [1],[3] 6 years 6 months 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] $ 20 $ 11
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 712 $ 287
Derivative Average Remaining Maturity [1],[3] 12 years 2 months 12 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] $ 20 $ 11
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 712 $ 287
Derivative Average Remaining Maturity [1],[3] 12 years 2 months 12 days 15 years
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 0 $ 2
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 183 $ 232
Derivative Average Remaining Maturity [1],[3] 2 years 1 month 6 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] $ 0 $ 0
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 988 $ 988
Derivative Average Remaining Maturity [1],[3] 3 years 2 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] $ 0 $ 2
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 1,171 $ 1,220
Derivative Average Remaining Maturity [1],[3] 3 years 3 years 6 months
Standard & Poor's, BB Rating [Member]    
Credit Derivatives [Line Items]    
Derivative Average Remaining Maturity [1] 2 months 12 days [3] 8 months 12 days [2]
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] 9 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] $ 9 $ 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.