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Contracts Accounted for as Insurance - Loss and LAE Reserve and Salvage and Subrogation Recoverable Net of Reinsurance (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Net reserve (salvage) $ 75 $ 37
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]    
Net reserve (salvage) 120 72
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]    
Net reserve (salvage) 42 42
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]    
Net reserve (salvage) (45) (35)
U.S. | 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]    
Net reserve (salvage) 119 71
U.S. | RMBS | 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]    
Net reserve (salvage) (87) (77)
Non U.S. | 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]    
Net reserve (salvage) $ 1 $ 1