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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, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Guarantor Obligations [Line Items]        
Net expected loss to be paid (recovered) - financial guaranty insurance $ 432 $ 411 $ 472 $ 529
Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance (715) $ (864)    
Net expected loss to be expensed 221      
Financial Guarantee Insurance And Other Product Line        
Guarantor Obligations [Line Items]        
Net expected loss to be paid (recovered) - financial guaranty insurance (383)      
Contra-paid, net 21      
Salvage and subrogation recoverable 527      
Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance (710)      
Net expected loss to be expensed $ 221