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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]        
Loss and loss adjustment expenses (benefit) $ (11) $ (16) $ 46 $ 14
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) 11 3 66 21
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) 11 4 66 30
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 (1) 0 (9)
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) (22) (18) (19) (6)
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) 0 (1) (1) (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) $ (22) $ (19) $ (20) $ (7)