v3.25.2
Contracts Accounted for as Credit Derivatives - Credit Derivatives Subordination and Ratings (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Credit Derivatives    
Estimated remaining weighted average life of credit derivatives (in years) 9 years 8 years 4 months 24 days
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding $ 3,838 $ 4,212
Net Fair Value Asset (Liability) (29) (29)
Public finance | United States    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 1,002 1,025
Net Fair Value Asset (Liability) (11) (12)
Public finance | Non United States    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 1,670 2,044
Net Fair Value Asset (Liability) (16) (15)
Structured finance | United States    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 145 150
Net Fair Value Asset (Liability) (2) (2)
Structured finance | Non United States    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 1,021 993
Net Fair Value Asset (Liability) $ 0 $ 0