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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
Mar. 31, 2022
Mar. 31, 2021
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Loss and loss adjustment expenses $ 57 $ 30
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 55 18
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 55 26
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 0 (8)
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 3 12
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 (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 $ 2 $ 12