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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, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 2,069 | $ 2,197
Fixed maturity securities, at fair value | 2,073 |
Amortized Cost, Due in one year or less | 441 |
Amortized Cost, Due after one year through five years | 510 |
Amortized Cost, Due after five years through ten years | 307 |
Amortized Cost, Due after ten years | 177 |
Amortized Cost, Total | 1,436 |
Estimated Fair Value, Due in one year or less | 439 |
Estimated Fair Value, Due after one year through five years | 498 |
Estimated Fair Value, Due after five years through ten years | 289 |
Estimated Fair Value, Due after ten years | 176 |
Estimated Fair Value due, Total | 1,402 |
Fixed Income Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,737 | 1,744
Fixed maturity securities, at fair value | 1,740 | 1,710
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 255 | 239
Fixed maturity securities, at fair value | 281 | 250
Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 24 |
Fixed maturity securities, at fair value | 24 |
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 113 | 139
Fixed maturity securities, at fair value | 113 | 139
Fixed Income Securities [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 242 | 301
Fixed maturity securities, at fair value | $ 252 | $ 303

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