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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Premiums Written |  |  |  |  |  |  |  |  | $ 28 | $ 24 | $ 14
Assumed Reinsurance Premiums Written |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ceded Reinsurance Premiums Written |  |  |  |  |  |  |  |  | (31) | (17) | 2
Premiums written, net of reinsurance |  |  |  |  |  |  |  |  | 60 | 41 | 12
Direct Premiums Earned |  |  |  |  |  |  |  |  | 75 | 119 | 190
Premiums Earned, Net |  |  |  |  |  |  |  |  | 66 | 111 | 175
Assumed Reinsurance Premiums Earned |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ceded Reinsurance Premiums Earned |  |  |  |  |  |  |  |  | 10 | 8 | 15
Reinsurance on premiums earned, Net | $ 20 | $ 10 | $ 8 | $ 28 | $ 29 | $ 26 | $ 26 | $ 31 | $ 66 | $ 111 | $ 175

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