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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Credit Derivatives [Line Items]    
Credit Risk Derivatives, at Fair Value, Net [1] $ 4 $ (19)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 1,475 $ 1,523
Derivative Average Remaining Maturity [1],[3] 8 years 6 months 9 years 4 months 24 days
Standard & Poor's, BBB Rating [Member]    
Credit Derivatives [Line Items]    
Credit Risk Derivatives, at Fair Value, Net [1] $ 3 $ 1
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 1,045 $ 1,070
Derivative Average Remaining Maturity [1],[3] 4 years 8 months 12 days 5 years 9 months 18 days
Single Name Credit Default Swaps [Member] | Standard Poors AAA To A Ratings [Member]    
Credit Derivatives [Line Items]    
Credit Risk Derivatives, at Fair Value, Net [1] $ 2 $ (18)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 420 $ 428
Derivative Average Remaining Maturity [1],[3] 18 years 1 month 6 days 18 years 8 months 12 days
Single Name Credit Default Swaps [Member] | Standard & Poor's, BBB Rating [Member]    
Credit Derivatives [Line Items]    
Credit Risk Derivatives, at Fair Value, Net [1] $ 4 $ 1
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 165 $ 155
Derivative Average Remaining Maturity [1],[3] 2 years 9 months 18 days 3 years 3 months 18 days
Single Name Credit Default Swaps [Member] | Standard & Poor's, BB+ Rating [Member]    
Credit Derivatives [Line Items]    
Credit Risk Derivatives, at Fair Value, Net [1] $ (1) $ (2)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 10 $ 25
Derivative Average Remaining Maturity [1],[3] 2 years 2 months 12 days 3 years 2 months 12 days
Credit Default Swaps Referencing Indices [Member] | Standard & Poor's, BBB Rating [Member]    
Credit Derivatives [Line Items]    
Credit Risk Derivatives, at Fair Value, Net [1] $ (1) $ 0
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 880 $ 915
Derivative Average Remaining Maturity [1],[3] 5 years 6 years 2 months 12 days
[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