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Financial Guarantee Insurance Contracts Earned Premiums by Geographic Location (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Premiums Earned, Net, Financial Guarantee Insurance Contracts	$ 11	$ 8	$ 21	$ 36
United States [Member] | Reportable Geographical Components [Member]
Premiums Earned, Net, Financial Guarantee Insurance Contracts	8	6	15	34
United Kingdom [Member] | Reportable Geographical Components [Member]
Premiums Earned, Net, Financial Guarantee Insurance Contracts	4	4	8	8
Other International [Member] | Reportable Geographical Components [Member]
Premiums Earned, Net, Financial Guarantee Insurance Contracts	$ (1)	$ (2)	$ (1)	$ (7)

X

- Definition

Amount, after premiums ceded to other entities and premiums assumed by the entity, of financial guarantee premiums earned.

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