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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
Mar. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Assets $ 17,845 $ 18,208
Liabilities 11,829 11,708
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Assets 307 260
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Recourse    
Variable Interest Entity [Line Items]    
Liabilities 316 269
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Nonrecourse    
Variable Interest Entity [Line Items]    
Liabilities 19 20
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | UNITED STATES | RMBS | First Lien    
Variable Interest Entity [Line Items]    
Assets 204 221
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | UNITED STATES | RMBS | First Lien | Recourse    
Variable Interest Entity [Line Items]    
Liabilities 209 227
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | UNITED STATES | RMBS | First Lien | Nonrecourse    
Variable Interest Entity [Line Items]    
Liabilities 19 20
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | UNITED STATES | RMBS | Second Lien    
Variable Interest Entity [Line Items]    
Assets 35 39
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | UNITED STATES | RMBS | Second Lien | Recourse    
Variable Interest Entity [Line Items]    
Liabilities 36 42
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Puerto Rico    
Variable Interest Entity [Line Items]    
Assets 53 0
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Puerto Rico | Recourse    
Variable Interest Entity [Line Items]    
Liabilities 56 0
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Other    
Variable Interest Entity [Line Items]    
Assets 15 0
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Other | Recourse    
Variable Interest Entity [Line Items]    
Liabilities $ 15 $ 0