Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Number of Consolidated FG VIEs (Details) - Variable Interest Entity, Primary Beneficiary - Entity	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Consolidated FG VIEs Rollforward [Roll Forward]
Beginning of year	25
End of year	25	25
Financial Guaranty Variable Interest Entities
Schedule of Consolidated FG VIEs Rollforward [Roll Forward]
Beginning of year	25	27	31
Consolidated	1	2	1
Deconsolidated	(1)	(2)	(3)
Matured	0	(2)	(2)
End of year	25	25	27