v3.26.1
Derivatives (Credit Derivatives) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 181 $ 100
Maximum Amount of Future Payments under Credit Default Swaps $ 11,689 $ 6,619
Weighted Average Years to Maturity 4 years 1 month 6 days 2 years 9 months 18 days
Collateral Securities Repledged, Delivered, or Used $ 5  
Aaa/Aa/A    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps 31 $ 45
Maximum Amount of Future Payments under Credit Default Swaps $ 3,777 $ 3,777
Weighted Average Years to Maturity 10 months 24 days 1 year 4 months 24 days
Aaa/Aa/A | Credit default swaps referencing indices    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 31 $ 45
Maximum Amount of Future Payments under Credit Default Swaps $ 3,777 $ 3,777
Weighted Average Years to Maturity 10 months 24 days 1 year 4 months 24 days
Baa [Member]    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 133 $ 49
Maximum Amount of Future Payments under Credit Default Swaps $ 7,641 $ 2,729
Weighted Average Years to Maturity 5 years 9 months 18 days 4 years 10 months 24 days
Baa [Member] | 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 $ 15 $ 15
Weighted Average Years to Maturity 2 years 2 years 6 months
Baa [Member] | Credit default swaps referencing indices    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 133 $ 49
Maximum Amount of Future Payments under Credit Default Swaps $ 7,626 $ 2,714
Weighted Average Years to Maturity 5 years 9 months 18 days 4 years 10 months 24 days
Ba    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 0 $ 1
Maximum Amount of Future Payments under Credit Default Swaps $ 24 $ 24
Weighted Average Years to Maturity 6 months 1 year
Ba | 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 $ 24 $ 24
Weighted Average Years to Maturity 6 months 1 year
Caa    
Credit Derivatives [Line Items]    
Estimated Fair Value of Credit Default Swaps $ 0 $ (1)
Maximum Amount of Future Payments under Credit Default Swaps $ 15 $ 15
Weighted Average Years to Maturity 6 months 1 year
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 $ 15 $ 15
Weighted Average Years to Maturity 6 months 1 year
B    
Credit Derivatives [Line Items]    
Maximum Amount of Future Payments under Credit Default Swaps $ 232 $ 74
Weighted Average Years to Maturity 4 years 2 months 12 days 3 years
Estimated Fair Value of Credit Default Swaps $ 17 $ 6
B | Credit default swaps referencing indices    
Credit Derivatives [Line Items]    
Maximum Amount of Future Payments under Credit Default Swaps $ 232 $ 74
Weighted Average Years to Maturity 4 years 2 months 12 days 3 years
Estimated Fair Value of Credit Default Swaps $ 17 $ 6