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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Direct Premiums Written | $ 11 | $ 3
Assumed Reinsurance Premiums Written | 0 | 0
Ceded Reinsurance Premiums Written | (1) | (1)
Premiums written, net of reinsurance | (12) | (4)
Direct Premiums Earned | 13 | 29
Assumed Reinsurance Premiums Earned | 1 | 0
Ceded Reinsurance Premiums Earned | 3 | 2
Reinsurance on premiums earned, Net | $ 10 | $ 28

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