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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, 2023
Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]    
Net Reserve (Recoverable) $ 80 $ 37
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) 106 72
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) (26) (35)
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) 105 71
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) (67) (77)
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