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Contracts Accounted for as Insurance - Reconciliation of Net Expected Loss to be Paid and Expensed (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Guarantor Obligations [Line Items]        
Net expected loss to be paid (recovered) - financial guaranty insurance $ (517) $ (522) $ (432) $ (411)
Net expected loss to be expensed 195      
Financial Guarantee Insurance And Other Product Line        
Guarantor Obligations [Line Items]        
Net expected loss to be paid (recovered) - financial guaranty insurance 202      
Contra-paid, net 22      
Salvage and subrogation recoverable, net 257      
Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance (286)      
Net expected loss to be expensed $ 195