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Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, Due in one year or less | $ 606 |
Amortized Cost, Due after one year through five years | 456 |
Amortized Cost, Due after five years through ten years | 317 |
Amortized Cost, Due after ten years | 51 |
Amortized Cost, Total | 1,429 |
Fixed income securities, amortized cost | 2,041 |
Estimated Fair Value, Due in one year or less | 605 |
Estimated Fair Value, Due after one year through five years | 427 |
Estimated Fair Value, Due after five years through ten years | 277 |
Estimated Fair Value, Due after ten years | 43 |
Estimated Fair Value due, Total | 1,353 |
Debt Securities, Available-for-sale | 1,966 |
Fixed Income Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed income securities, amortized cost | 1,469 | $ 1,605
Debt Securities, Available-for-sale | 1,395 | 1,730
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed income securities, amortized cost | 230 |
Debt Securities, Available-for-sale | 238 | 252
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed income securities, amortized cost | 141 |
Debt Securities, Available-for-sale | 137 | 128
Fixed Income Securities [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed income securities, amortized cost | 227 |
Debt Securities, Available-for-sale | $ 224 | $ 265

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