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Financial Guarantee Insurance Contracts Earned Premiums by Geographic Location (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ 15 | $ 10 | $ 36 | $ 46
United States [Member] | Reportable Geographical Components [Member] |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | 9 | 11 | 24 | 44
United Kingdom [Member] | Reportable Geographical Components [Member] |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | 7 | 4 | 15 | 13
Other International [Member] | Reportable Geographical Components [Member] |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ (1) | $ (4) | $ (2) | $ (11)

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