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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums Written	$ (2)	$ 11
Assumed Reinsurance Premiums Written	0	0
Ceded Reinsurance Premiums Written	7	(1)
Premiums written, net of reinsurance	9	(12)
Direct Premiums Earned	17	13
Assumed Reinsurance Premiums Earned	0	1
Ceded Reinsurance Premiums Earned	3	3
Reinsurance on premiums earned, Net	$ 14	$ 10

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