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Contracts Accounted for as Insurance - Loss and LAE Reported on the Statements of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]        
Loss and loss adjustment expenses (benefit) $ (30) $ (51) $ 38 $ (54)
Public finance | Financial Guarantee Insurance And Other Product Line        
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]        
Loss and loss adjustment expenses (benefit) (7) (11) 64 (12)
Public finance | Financial Guarantee Insurance And Other Product Line | United States        
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]        
Loss and loss adjustment expenses (benefit) (5) (11) 46 (12)
Public finance | Financial Guarantee Insurance And Other Product Line | Non United States        
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]        
Loss and loss adjustment expenses (benefit) (2) 0 18 0
RMBS | Financial Guarantee Insurance And Other Product Line | United States        
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]        
Loss and loss adjustment expenses (benefit) (25) (39) (25) (42)
Other structured finance | Financial Guarantee Insurance And Other Product Line        
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]        
Loss and loss adjustment expenses (benefit) 2 (1) (1) 0
Structured finance | Financial Guarantee Insurance And Other Product Line        
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]        
Loss and loss adjustment expenses (benefit) $ (23) $ (40) $ (26) $ (42)