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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums Written	$ (1)	$ (13)	$ (6)	$ (2)
Assumed Reinsurance Premiums Written	0	0	0	0
Ceded Reinsurance Premiums Written	14	0	29	(1)
Premiums written, net of reinsurance	15	13	36	2
Direct Premiums Earned	15	18	46	45
Assumed Reinsurance Premiums Earned	0	0	0	1
Ceded Reinsurance Premiums Earned	4	3	10	9
Reinsurance on premiums earned, Net	$ 11	$ 15	$ 36	$ 36

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