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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
	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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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