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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
Sep. 30, 2024
Dec. 31, 2023
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Net Reserve (Recoverable) $ (158) $ 75
Public finance | Financial Guarantee Insurance And Other Product Line    
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Net Reserve (Recoverable) (32) 120
Other structured finance | Financial Guarantee Insurance And Other Product Line    
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Net Reserve (Recoverable) 32 42
Structured finance | Financial Guarantee Insurance And Other Product Line    
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Net Reserve (Recoverable) (126) (45)
United States | Public finance | Financial Guarantee Insurance And Other Product Line    
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Net Reserve (Recoverable) (33) 119
United States | RMBS | Financial Guarantee Insurance And Other Product Line    
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Net Reserve (Recoverable) (158) (87)
Non United States | Public finance | Financial Guarantee Insurance And Other Product Line    
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Net Reserve (Recoverable) $ 1 $ 1