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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) Entity | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) Entity | Sep. 30, 2023 USD ($) consolidationVIE | Dec. 31, 2023 USD ($) Entity
Variable Interest Entities [Line Items] |  |  |  |  |
Variable Interest Entity Change in Fair Value of Assets and Liabilities | $ 1,000,000 | $ 1,000,000 | $ 2,000,000 | $ 4,000,000 |
Revenue from Contract with Customer, Excluding Assessed Tax | 23,000,000 | 15,000,000 | 54,000,000 | 39,000,000 |
Realized Investment Gains (Losses) | (1,000,000) | 1,000,000 | 3,000,000 | (7,000,000) |
Other Operating Income (Expense), Net | 10,000,000 | 2,000,000 | 28,000,000 | 7,000,000 |
Fair value of special purpose entities | 0 |  | 0 |  |
Variable Interest Entity, Measure of Activity, Income or Loss before Tax | 3,000,000 | $ 1,000,000 | 5,000,000 | $ 0 |
Long-term debt | $ 518,000,000 |  | 518,000,000 |  | $ 508,000,000
Number of Variable Interest Entities Consolidated During the Period | 0 | 0 |  |  |
Number of Variable Interest Entities Deconsolidated During Period | consolidationVIE |  |  |  | 1 |
Gain (loss) from consolidating VIEs | $ 0 | $ 0 | 0 | $ 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | $ 54,000,000 |  | $ 54,000,000 |  | $ 40,000,000
Consolidated Entities [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 6 |  | 6 |  | 6
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, before Tax | $ 0 | 0 | $ 0 | 0 |
VIE Change in FV of Assets Liabilities, Net of Credit Risk Change | 1,000,000 | 1,000,000 | 2,000,000 | 4,000,000 |
Gross Investment Income, Operating | 3,000,000 | 1,000,000 |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,000,000 |  | 10,000,000 |  |
Interest Expense, Long-term Debt | (3,000,000) | (2,000,000) | (9,000,000) | (10,000,000) |
Other Operating Income (Expense), Net | 0 | 0 | 6,000,000 | (1,000,000) |
Long-term debt | $ 2,996,000,000 |  | $ 2,996,000,000 |  | $ 2,967,000,000
Ambac UK [Member] | Consolidated Entities [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 4 |  | 4 |  | 4
Ambac UK [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Long-term debt | $ 2,841,000,000 |  | $ 2,841,000,000 |  | $ 2,808,000,000
Ambac Assurance [Member] | Consolidated Entities [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 2 |  | 2 |  | 2
Ambac Assurance [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Long-term debt | $ 156,000,000 |  | $ 156,000,000 |  | $ 159,000,000
Fixed Income Investments [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Gross Investment Income, Operating |  |  | 8,000,000 | 6,000,000 |
Realized Investment Gains (Losses) | $ 0 | $ 0 | $ 0 | $ 0 |

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