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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums Written | $ (249) | $ (127) | $ (2)
Assumed Reinsurance Premiums Written | 40 | 0 | 0
Ceded Reinsurance Premiums Written | (244) | (104) | (35)
Premiums written, net of reinsurance | (44) | (23) | 33
Direct Premiums Earned | 224 | 126 | 62
Premiums Earned, Net | 78 | 56 | 47
Assumed Reinsurance Premiums Earned | 18 | 0 | 0
Ceded Reinsurance Premiums Earned | 164 | 69 | 15
Reinsurance on premiums earned, Net | 78 | 56 | $ 47
Reinsurance Recoverable, Allowance for Credit Loss | $ 0 | $ 0 |

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