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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 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 2,972 | $ 3,187
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 3,065 |
Amortized Cost, Due in one year or less | 862 |
Amortized Cost, Due after one year through five years | 912 |
Amortized Cost, Due after five years through ten years | 408 |
Amortized Cost, Due after ten years | 182 |
Amortized Cost, Total | 2,365 |
Estimated Fair Value, Due in one year or less | 863 |
Estimated Fair Value, Due after one year through five years | 923 |
Estimated Fair Value, Due after five years through ten years | 432 |
Estimated Fair Value, Due after ten years | 196 |
Estimated Fair Value due, Total | 2,413 |
Fixed Income Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,126 | 2,450
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 2,218 | 2,577
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 258 | 200
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 291 | 248
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 74 | 147
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 73 | 146
Fixed Income Securities [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 275 | 263
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | $ 288 | $ 287

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