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Financial Guarantee Insurance Contracts Earned Premiums by Geographic Location (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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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)

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