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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Schedule of Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Assets $ 17,845 $ 18,208
Liabilities 11,829 11,708
Variable Interest Entity, Primary Beneficiary | Fund investments: | Cash and cash equivalents    
Variable Interest Entity [Line Items]    
Assets 68 64
Variable Interest Entity, Primary Beneficiary | Fund investments: | Equity securities and warrants    
Variable Interest Entity [Line Items]    
Assets 255 252
Variable Interest Entity, Primary Beneficiary | Fund investments: | Obligations of state and political subdivisions    
Variable Interest Entity [Line Items]    
Assets 126 101
Variable Interest Entity, Primary Beneficiary | Fund investments: | Structured products    
Variable Interest Entity [Line Items]    
Assets 74 62
Variable Interest Entity, Primary Beneficiary | Fund investments: | Structured products | Investments in AssuredIM Funds and Other Affiliated Entities    
Variable Interest Entity [Line Items]    
Assets 23 25
Variable Interest Entity, Primary Beneficiary | Fund investments: | Due from brokers and counterparties    
Variable Interest Entity [Line Items]    
Assets 16 49
Variable Interest Entity, Primary Beneficiary | Fund investments: | Other    
Variable Interest Entity [Line Items]    
Assets 1 1
Variable Interest Entity, Primary Beneficiary | Fund investments: | Equity Securities and Warrants | Investments in AssuredIM Funds and Other Affiliated Entities    
Variable Interest Entity [Line Items]    
Assets 200 198
Variable Interest Entity, Primary Beneficiary | Fund investments: | Corporate securities    
Variable Interest Entity [Line Items]    
Assets 85 98
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets: | Cash and cash equivalents    
Variable Interest Entity [Line Items]    
Assets 90 156
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets: | Due from brokers and counterparties    
Variable Interest Entity [Line Items]    
Assets 121 99
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets: | Loans in CLOs, fair value option    
Variable Interest Entity [Line Items]    
Assets 3,865 3,913
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets: | Loans in CLO warehouses, fair value option    
Variable Interest Entity [Line Items]    
Assets 834 331
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets: | Short-term investments    
Variable Interest Entity [Line Items]    
Assets 165 145
Variable Interest Entity, Primary Beneficiary | Assets of Consolidated Investment Vehicles    
Variable Interest Entity [Line Items]    
Assets 5,700 5,271
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs    
Variable Interest Entity [Line Items]    
Liabilities 4,854 4,436
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | CLO obligations of CFEs    
Variable Interest Entity [Line Items]    
Liabilities $ 3,598 $ 3,665
CLO's weighted average maturity 6 years 8 months 12 days 6 years 7 months 6 days
CLO's weighted average interest rate 1.90% 1.80%
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Warehouse financing debt    
Variable Interest Entity [Line Items]    
Liabilities $ 339 $ 126
CLO's weighted average maturity 7 months 6 days 1 year 9 months 18 days
CLO's weighted average interest rate 1.30% 1.10%
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Securities sold short    
Variable Interest Entity [Line Items]    
Liabilities $ 36 $ 41
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Due to brokers and counterparties    
Variable Interest Entity [Line Items]    
Liabilities 844 570
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Other liabilities    
Variable Interest Entity [Line Items]    
Liabilities 37 34
Voting Interest Entity | Assets of Consolidated Investment Vehicles | Investments    
Variable Interest Entity [Line Items]    
Assets $ 17 $ 12