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Contracts Accounted for as Insurance - Reconciliation of Net Expected Loss to be Paid and Expensed (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Guarantor Obligations [Line Items]            
Net expected loss to be paid (recovered) - financial guaranty insurance $ 447 $ 433 $ 505 $ 560 $ 517 $ 522
Net expected loss to be expensed (present value) 225          
Financial Guarantee Insurance And Other Product Line            
Guarantor Obligations [Line Items]            
Net expected loss to be paid (recovered) - financial guaranty insurance 200          
Contra-paid, net 21          
Salvage and subrogation recoverable, net 292          
Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance (288)          
Net expected loss to be expensed (present value) $ 225