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Derivatives (Credit Derivatives) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 232 $ 196
Maximum Amount of Future Payments under Credit Default Swaps $ 11,983 $ 11,764
Weighted Average Years to Maturity 3 years 8 months 12 days 3 years 4 months 24 days
Aaa/Aa/A    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 53 $ 73
Maximum Amount of Future Payments under Credit Default Swaps $ 4,113 $ 4,198
Weighted Average Years to Maturity 1 year 6 months 2 years 2 months 12 days
Aaa/Aa/A | Single name credit default swaps (3)    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 1 $ 1
Maximum Amount of Future Payments under Credit Default Swaps $ 67 $ 72
Weighted Average Years to Maturity 1 year 4 months 24 days 1 year 10 months 24 days
Aaa/Aa/A | Credit default swaps referencing indices    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 52 $ 72
Maximum Amount of Future Payments under Credit Default Swaps $ 4,046 $ 4,126
Weighted Average Years to Maturity 1 year 6 months 2 years 2 months 12 days
Baa    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 155 $ 112
Maximum Amount of Future Payments under Credit Default Swaps $ 7,508 $ 7,365
Weighted Average Years to Maturity 4 years 10 months 24 days 4 years 1 month 6 days
Baa | Single name credit default swaps (3)    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 1 $ 1
Maximum Amount of Future Payments under Credit Default Swaps $ 49 $ 102
Weighted Average Years to Maturity 4 years 1 year 7 months 6 days
Baa | Credit default swaps referencing indices    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 154 $ 111
Maximum Amount of Future Payments under Credit Default Swaps $ 7,459 $ 7,263
Weighted Average Years to Maturity 4 years 10 months 24 days 4 years 1 month 6 days
B    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 23 $ 10
Maximum Amount of Future Payments under Credit Default Swaps $ 308 $ 144
Weighted Average Years to Maturity 3 years 9 months 18 days 3 years 8 months 12 days
B | Single name credit default swaps (3)    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 0 $ 0
Maximum Amount of Future Payments under Credit Default Swaps $ 19 $ 0
Weighted Average Years to Maturity 8 months 12 days 0 years
B | Credit default swaps referencing indices    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 23 $ 10
Maximum Amount of Future Payments under Credit Default Swaps $ 289 $ 144
Weighted Average Years to Maturity 4 years 1 month 6 days 3 years 8 months 12 days
Caa    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 0 $ (1)
Maximum Amount of Future Payments under Credit Default Swaps $ 30 $ 15
Weighted Average Years to Maturity 8 months 12 days 2 years
Caa | Credit default swaps referencing indices    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 0 $ (1)
Maximum Amount of Future Payments under Credit Default Swaps $ 30 $ 15
Weighted Average Years to Maturity 8 months 12 days 2 years
Ba    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 1 $ 2
Maximum Amount of Future Payments under Credit Default Swaps $ 24 $ 42
Weighted Average Years to Maturity 1 year 2 months 12 days 1 year 7 months 6 days
Ba | Single name credit default swaps (3)    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 0 $ 0
Maximum Amount of Future Payments under Credit Default Swaps $ 0 $ 17
Weighted Average Years to Maturity 0 years 1 year 1 month 6 days
Ba | Credit default swaps referencing indices    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 1 $ 2
Maximum Amount of Future Payments under Credit Default Swaps $ 24 $ 25
Weighted Average Years to Maturity 1 year 2 months 12 days 2 years