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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Schedule of Assets and Liabilities (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Variable Interest Entity [Line Items] |  |
Assets | $ 16,960 | $ 18,208
Liabilities | 11,392 | 11,708
Variable Interest Entity, Primary Beneficiary | Fund investments: | Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Assets | 49 | 64
Variable Interest Entity, Primary Beneficiary | Fund investments: | Equity securities and warrants |  |
Variable Interest Entity [Line Items] |  |
Assets | 394 | 252
Variable Interest Entity, Primary Beneficiary | Fund investments: | Obligations of state and political subdivisions |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 101
Variable Interest Entity, Primary Beneficiary | Fund investments: | Corporate securities |  |
Variable Interest Entity [Line Items] |  |
Assets | 90 | 98
Variable Interest Entity, Primary Beneficiary | Fund investments: | Structured products |  |
Variable Interest Entity [Line Items] |  |
Assets | 127 | 62
Variable Interest Entity, Primary Beneficiary | Fund investments: | Due from brokers and counterparties |  |
Variable Interest Entity [Line Items] |  |
Assets | 6 | 49
Variable Interest Entity, Primary Beneficiary | Fund investments: | Other |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 1
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets: | Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Assets | 76 | 156
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets: | Due from brokers and counterparties |  |
Variable Interest Entity [Line Items] |  |
Assets | 91 | 99
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets: | Loans in CLOs, FVO |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,160 | 3,913
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets: | Loans in CLO warehouses, FVO |  |
Variable Interest Entity [Line Items] |  |
Assets | 233 | 331
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets: | Short-term investments |  |
Variable Interest Entity [Line Items] |  |
Assets | 230 | 145
Variable Interest Entity, Primary Beneficiary | Assets of Consolidated Investment Vehicles |  |
Variable Interest Entity [Line Items] |  |
Assets | 5,456 | 5,271
Variable Interest Entity, Primary Beneficiary | Assets of Consolidated Investment Vehicles | Investments in AssuredIM Funds and Other Affiliated Entities |  |
Variable Interest Entity [Line Items] |  |
Assets | 358 | 223
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 4,568 | 4,436
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | CLO obligations of CFEs |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 3,947 | $ 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 | 2.80% | 1.80%
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Warehouse financing debt |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 157 | $ 126
CLO's weighted average maturity | 1 year 2 months 12 days | 1 year 9 months 18 days
CLO's weighted average interest rate | 1.00% | 1.10%
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Securities sold short, at fair value |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 0 | $ 41
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Due to brokers and counterparties |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 424 | 570
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 40 | 34
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles, Meeting Voting Interest Entity Criteria |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 60 | $ 12

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