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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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