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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums Written	$ (13)	$ (13)	$ (2)	$ (31)
Assumed Reinsurance Premiums Written	0	0	0	0
Ceded Reinsurance Premiums Written	0	23	(1)	22
Premiums written, net of reinsurance	13	36	2	53
Direct Premiums Earned	18	13	45	53
Assumed Reinsurance Premiums Earned	0	0	1	0
Ceded Reinsurance Premiums Earned	3	3	9	7
Reinsurance on premiums earned, Net	$ 15	$ 10	$ 36	$ 46

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