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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
Mar. 31, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Net Reserve (Recoverable) $ 188 $ 79
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) 128 61
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) 42 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) 60 18
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) 127 60
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) 18 (24)
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