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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]        
Loss and loss adjustment expenses (benefit) $ 100 $ (75) $ 159 $ (29)
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) 134 1 186 67
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) 134 1 186 67
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) 0 0 0 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) (35) (78) (31) (97)
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) 1 2 4 1
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) $ (34) $ (76) $ (27) $ (96)