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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, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,983 | $ 2,041
Fixed maturity securities, at fair value | 1,923 |
Amortized Cost, Due in one year or less | 486 |
Amortized Cost, Due after one year through five years | 536 |
Amortized Cost, Due after five years through ten years | 297 |
Amortized Cost, Due after ten years | 53 |
Amortized Cost, Total | 1,371 |
Estimated Fair Value, Due in one year or less | 485 |
Estimated Fair Value, Due after one year through five years | 508 |
Estimated Fair Value, Due after five years through ten years | 268 |
Estimated Fair Value, Due after ten years | 47 |
Estimated Fair Value due, Total | 1,307 |
Fixed Income Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,554 | 1,469
Fixed maturity securities, at fair value | 1,494 | 1,395
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 231 | 230
Fixed maturity securities, at fair value | 240 | 238
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 140 | 141
Fixed maturity securities, at fair value | 137 | 137
Fixed Income Securities [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 226 | 227
Fixed maturity securities, at fair value | $ 223 | $ 224

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