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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums Written | $ (2) | $ 1 | $ 28
Assumed Reinsurance Premiums Written | 0 | 0 | 0
Ceded Reinsurance Premiums Written | (35) | 1 | (31)
Premiums written, net of reinsurance | 33 | 0 | 60
Direct Premiums Earned | 62 | 65 | 75
Premiums Earned, Net | 47 | 54 | 66
Assumed Reinsurance Premiums Earned | 0 | 1 | 0
Ceded Reinsurance Premiums Earned | 15 | 12 | 10
Reinsurance on premiums earned, Net | 47 | 54 | $ 66
Reinsurance Recoverable, Allowance for Credit Loss | $ 0 | $ 0 |

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