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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Roll Forward of Number of Consolidated CIVs (Details) (Details) - Variable Interest Entity, Primary Beneficiary - Consolidated Investment Vehicles | 12 Months Ended
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Dec. 31, 2023 Entity | Dec. 31, 2022 Entity fund | Dec. 31, 2021 fund Entity
Variable Interest Entity [Line Items] |  |  |
Number of financial assets securitized | fund |  | 2 | 5
Schedule of Consolidated FG VIEs Rollforward [Roll Forward] |  |  |
Beginning of year | 22 | 20 | 11
Consolidated | 0 | 4 | 10
Deconsolidated | (19) | (2) | (1)
December 31 |  | 22 | 20

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