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Contracts Accounted for as Insurance - Loss and LAE Reported on the Statements of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]      
Loss and LAE (benefit) $ 162 $ 16 $ (220)
Public finance | Financial Guarantee Insurance And Other Product Line | Consolidated Entity Excluding Variable Interest Entities (VIE)      
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]      
Loss and LAE (benefit) 192 125 (155)
Public finance | Financial Guarantee Insurance And Other Product Line | Consolidated Entity Excluding Variable Interest Entities (VIE) | U.S.      
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]      
Loss and LAE (benefit) 192 125 (146)
Public finance | Financial Guarantee Insurance And Other Product Line | Consolidated Entity Excluding Variable Interest Entities (VIE) | Non U.S.      
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]      
Loss and LAE (benefit) 0 0 (9)
RMBS | Financial Guarantee Insurance And Other Product Line | Consolidated Entity Excluding Variable Interest Entities (VIE) | U.S.      
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]      
Loss and LAE (benefit) (34) (112) (69)
Other structured finance | Financial Guarantee Insurance And Other Product Line | Consolidated Entity Excluding Variable Interest Entities (VIE)      
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]      
Loss and LAE (benefit) 4 3 4
Structured finance | Financial Guarantee Insurance And Other Product Line | Consolidated Entity Excluding Variable Interest Entities (VIE)      
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]      
Loss and LAE (benefit) $ (30) $ (109) $ (65)