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Contracts Accounted for as Insurance - Reconciliation of Net Expected Loss to be Paid and Expensed (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Guarantor Obligations [Line Items]            
Net expected loss to be paid (recovered) - financial guaranty insurance $ (727) $ (442) $ (411) $ (199) $ (466) $ (529)
Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance (879)   $ (864)      
Net expected loss to be expensed 218          
Financial Guarantee Insurance And Other Product Line            
Guarantor Obligations [Line Items]            
Net expected loss to be paid (recovered) - financial guaranty insurance 691          
Contra-paid, net 18          
Salvage and subrogation recoverable, net 384          
Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance (875)          
Net expected loss to be expensed $ 218