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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 | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 2,005 |
Fixed maturity securities, at fair value | 2,036 |
Amortized Cost, Due in one year or less | 683 |
Amortized Cost, Due after one year through five years | 431 |
Amortized Cost, Due after five years through ten years | 317 |
Amortized Cost, Due after ten years | 41 |
Amortized Cost, Total | 1,472 |
Estimated Fair Value, Due in one year or less | 683 |
Estimated Fair Value, Due after one year through five years | 416 |
Estimated Fair Value, Due after five years through ten years | 300 |
Estimated Fair Value, Due after ten years | 39 |
Estimated Fair Value due, Total | 1,438 |
Fixed Income Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, at fair value | 1,383 | $ 1,730
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 179 |
Fixed maturity securities, at fair value | 225 | 252
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 121 |
Fixed maturity securities, at fair value | 120 | 128
Fixed Income Securities [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 232 |
Fixed maturity securities, at fair value | $ 252 | $ 265

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