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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, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, Due in one year or less | $ 749 |
Amortized Cost, Due after one year through five years | 1,157 |
Amortized Cost, Due after five years through ten years | 477 |
Amortized Cost, Due after ten years | 145 |
Amortized Cost, Total | 2,528 |
Fixed income securities, amortized cost | 3,187 | $ 3,451
Estimated Fair Value, Due in one year or less | 749 |
Estimated Fair Value, Due after one year through five years | 1,173 |
Estimated Fair Value, Due after five years through ten years | 501 |
Estimated Fair Value, Due after ten years | 160 |
Estimated Fair Value due, Total | 2,583 |
Debt Securities, Available-for-sale | 3,314 |
Fixed Income Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed income securities, amortized cost | 2,450 | 3,021
Debt Securities, Available-for-sale | 2,577 | 3,116
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed income securities, amortized cost | 200 | 222
Debt Securities, Available-for-sale | 248 | 259
Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed income securities, amortized cost | 49 |
Debt Securities, Available-for-sale | 50 |
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed income securities, amortized cost | 147 | 133
Debt Securities, Available-for-sale | 146 | 131
Fixed Income Securities [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed income securities, amortized cost | 263 | 370
Debt Securities, Available-for-sale | $ 287 | $ 442

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