v3.26.1
Derivatives - Credit Derivatives Subordination and Ratings (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Credit Derivatives    
Estimated remaining weighted average life of credit derivatives (in years) 9 years 3 months 18 days 8 years 7 months 6 days
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding $ 3,300 $ 3,800
Net Fair Value Asset (Liability) (16) (15)
Public finance | United States    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 1,000 1,000
Net Fair Value Asset (Liability) (2) (2)
Public finance | Non-U.S. public finance    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 1,300 1,600
Net Fair Value Asset (Liability) (13) (12)
Structured finance | United States    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 100 200
Net Fair Value Asset (Liability) (1) (1)
Structured finance | Non-U.S. public finance    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 900 1,000
Net Fair Value Asset (Liability) $ 0 $ 0