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Contracts Accounted for as Insurance - Reconciliation of Net Expected Loss to be Paid and Expensed (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Guarantor Obligations [Line Items]        
Net Expected Loss to be Paid (Recovered) $ 522 $ 411 $ 529 $ 737
Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance (293) $ (864)    
Net expected loss to be expensed (present value) 191      
Financial Guarantee Insurance And Other Product Line        
Guarantor Obligations [Line Items]        
Net Expected Loss to be Paid (Recovered) 201      
Contra-paid, net 23      
Salvage and subrogation recoverable, net 256      
Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance (289)      
Net expected loss to be expensed (present value) $ 191