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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($)
$ in Millions
 6 Months Ended 9 Months Ended
Jun. 30, 2025
Sep. 30, 2025
Dec. 31, 2024
Credit Derivatives [Line Items]      
Credit Derivative Current Fair Value [1]   $ (8) $ (2)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2]   $ 6,238 2,661
Derivative Average Remaining Maturity [1],[3] 6 years 9 months 18 days 6 years 2 months 12 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]   $ (12) (5)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2]   $ 490 410
Derivative Average Remaining Maturity [1],[3] 17 years 6 months 14 years 4 months 24 days  
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member]      
Credit Derivatives [Line Items]      
Credit Derivative Current Fair Value [1]   $ 2 3
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2]   $ 180 150
Derivative Average Remaining Maturity [1],[3] 2 years 3 months 18 days 2 years 2 months 12 days  
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member]      
Credit Derivatives [Line Items]      
Credit Derivative Current Fair Value [1]   $ 2 0
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2]   $ 5,553 2,086
Derivative Average Remaining Maturity [1],[3] 5 years 1 month 6 days 5 years 8 months 12 days  
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member]      
Credit Derivatives [Line Items]      
Credit Derivative Current Fair Value [1]   $ 4 3
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2]   $ 5,733 2,236
Derivative Average Remaining Maturity [1],[3] 4 years 10 months 24 days 5 years 6 months  
Standard & Poor's, BB Rating [Member]      
Credit Derivatives [Line Items]      
Derivative Average Remaining Maturity [1],[2] 1 year 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]   $ 5 5
Standard & Poor's, B Rating      
Credit Derivatives [Line Items]      
Derivative Average Remaining Maturity [3] 1 year 2 months 12 days 6 months  
Standard & Poor's, B Rating | 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 [2]   $ 10 $ 10
[1] ating agency designations are based on ratings from Standard and Poor’s (“S&P”) when available. Other credited rating agencies or internal ratings may be used when S&P ratings are not available.
[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.