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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
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Premiums Written |  |  |  |  |  |  |  |  | $ 1 | $ 28 | $ 24
Assumed Reinsurance Premiums Written |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ceded Reinsurance Premiums Written |  |  |  |  |  |  |  |  | 1 | (31) | (17)
Premiums written, net of reinsurance |  |  |  |  |  |  |  |  | 0 | 60 | 41
Direct Premiums Earned |  |  |  |  |  |  |  |  | 65 | 75 | 119
Premiums Earned, Net |  |  |  |  |  |  |  |  | 54 | 66 | 111
Assumed Reinsurance Premiums Earned |  |  |  |  |  |  |  |  | 1 | 0 | 0
Ceded Reinsurance Premiums Earned |  |  |  |  |  |  |  |  | 12 | 10 | 8
Reinsurance on premiums earned, Net | $ 18 | $ 15 | $ 11 | $ 10 | $ 20 | $ 10 | $ 8 | $ 28 | $ 54 | $ 66 | $ 111

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