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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 (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 2,914 |
Fixed income securities, at fair value | 3,048 |
Amortized Cost, Due in one year or less | 830 |
Amortized Cost, Due after one year through five years | 876 |
Amortized Cost, Due after five years through ten years | 432 |
Amortized Cost, Due after ten years | 182 |
Amortized Cost, Total | 2,320 |
Estimated Fair Value, Due in one year or less | 832 |
Estimated Fair Value, Due after one year through five years | 888 |
Estimated Fair Value, Due after five years through ten years | 453 |
Estimated Fair Value, Due after ten years | 206 |
Estimated Fair Value due, Total | 2,379 |
Fixed Income Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed income securities, at fair value | 2,311 | $ 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 | 251 |
Fixed income securities, at fair value | 296 | 248
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 74 |
Fixed income securities, at fair value | 73 | 146
Fixed Income Securities [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 268 |
Fixed income securities, at fair value | $ 300 | $ 287

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