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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, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Guarantor Obligations [Line Items]            
Net expected loss to be paid (recovered) - financial guaranty insurance $ 104 $ 186 $ 106 $ 306 $ 447 $ 505
Net expected loss to be expensed (present value) 257          
Financial Guarantee Insurance And Other Product Line            
Guarantor Obligations [Line Items]            
Net expected loss to be paid (recovered) - financial guaranty insurance 91          
Contra-paid, net 23          
Salvage and subrogation recoverable, net 449          
Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance (306)          
Net expected loss to be expensed (present value) $ 257