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Investments - Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Investment [Line Items] |  |  |
Fair Value Of Securities Deposited With Governmental Authorities | $ 23 | $ 17 |
Restricted Cash | $ 14 | 5 | $ 13
Fair Value ol Securities Held by Ambac UK Where Capital Stock of AUK is Pledged as Collateral for Sitka AAC Note |  | $ 669 |

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