Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Roll Forward of Number of Consolidated CIVs (Details) (Details)	12 Months Ended
	Dec. 31, 2021 Entity fund	Dec. 31, 2020 Entity fund	Dec. 31, 2019 Entity
Variable Interest Entity, Primary Beneficiary
Schedule of Consolidated FG VIEs Rollforward [Roll Forward]
Beginning of year	25
End of year	25	25
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles
Schedule of Consolidated FG VIEs Rollforward [Roll Forward]
Beginning of year	11	4	0
Consolidated	10	7	4
Deconsolidated	(1)	0	0
End of year	20	11	4
CLO Warehouse | Consolidated Investment Vehicles
Schedule of Consolidated FG VIEs Rollforward [Roll Forward]
Number of financial assets securitized | fund	5	2