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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Consolidated FG VIE's By Type of Collateral (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]      
Total assets $ 11,901 $ 12,539  
Total liabilities 6,348 6,774  
Cash 121 97 $ 107
Variable Interest Entity, Primary Beneficiary | Recourse | Financial Guaranty Variable Interest Entities      
Variable Interest Entity [Line Items]      
Total liabilities 155 543  
Variable Interest Entity, Primary Beneficiary | Nonrecourse | Financial Guaranty Variable Interest Entities      
Variable Interest Entity [Line Items]      
Total liabilities 9 11  
Variable Interest Entity, Primary Beneficiary | RMBS | U.S. | Recourse | Financial Guaranty Variable Interest Entities      
Variable Interest Entity [Line Items]      
Total liabilities 155 177  
Variable Interest Entity, Primary Beneficiary | RMBS | U.S. | Nonrecourse | Financial Guaranty Variable Interest Entities      
Variable Interest Entity [Line Items]      
Total liabilities 9 11  
Variable Interest Entity, Primary Beneficiary | Puerto Rico Trusts | Recourse | Financial Guaranty Variable Interest Entities      
Variable Interest Entity [Line Items]      
Total liabilities 0 366  
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities      
Variable Interest Entity [Line Items]      
Total assets 147 328  
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities | RMBS | U.S.      
Variable Interest Entity [Line Items]      
Total assets 147 173  
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities | Puerto Rico Trusts      
Variable Interest Entity [Line Items]      
Total assets $ 0 155  
Asset, fair value   1  
Cash   $ 154