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Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts Earned Premiums by Geographic Location (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ 20 | $ 10 | $ 8 | $ 28 | $ 29 | $ 26 | $ 26 | $ 31 | $ 66 | $ 111 | $ 175
Reportable Geographical Components [Member] | UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts |  |  |  |  |  |  |  |  | 55 | 88 | 134
Reportable Geographical Components [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts |  |  |  |  |  |  |  |  | 17 | 19 | 33
Reportable Geographical Components [Member] | Other International [Member] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts |  |  |  |  |  |  |  |  | $ (6) | $ 5 | $ 8

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