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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
Jun. 30, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Net Reserve (Recoverable) $ 212 $ 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) 155 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) 41 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) 57 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) 154 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) 16 (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