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v3.23.1

Special Purpose Entities, Including Variable Interest Entities - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 USD ($) Entity consolidationVIE | Mar. 31, 2022 USD ($) consolidationVIE | Dec. 31, 2022 USD ($) Entity
Variable Interest Entities [Line Items] |  |  |
Variable Interest Entity Change in Fair Value of Assets and Liabilities | $ 3,000,000 | $ (1,000,000) |
Realized Investment Gains (Losses) | (4,000,000) | 10,000,000 |
Other Operating Income (Expense), Net | 3,000,000 | 2,000,000 |
Fair value of special purpose entities | 0 |  |
Variable Interest Entity, Measure of Activity, Income or Loss before Tax | (1,000,000) | $ 22,000,000 |
Long-term debt | $ 497,000,000 |  | $ 639,000,000
Number of Variable Interest Entities Consolidated During the Period | 0 | 2 |
Number of Variable Interest Entities Deconsolidated During Period | consolidationVIE | 1 | 0 |
Gain (loss) from consolidating VIEs | $ 0 | $ 28,000,000 |
Number of Trusts Established Resulting From Puerto Rico Restructuring Transaction | 2 |  |
Variable Interest Entity Deconsolidation Gain Loss | $ 0 |  |
Consolidated Entities [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 8 |  | 9
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 | (1,000,000) |
VIE Change in FV of Assets Liabilities, Net of Credit Risk Change | 3,000,000 | (1,000,000) |
Gross Investment Income, Operating | 2,000,000 | (4,000,000) |
Interest Expense, Long-term Debt | (5,000,000) | (2,000,000) |
Long-term debt | $ 3,060,000,000 |  | $ 3,107,000,000
Ambac UK [Member] | Consolidated Entities [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 4 |  | 5
Ambac UK [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Long-term debt | $ 2,869,000,000 |  | $ 2,788,000,000
Ambac Assurance [Member] | Consolidated Entities [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 4 |  | 4
Ambac Assurance [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Long-term debt | $ 191,000,000 |  | $ 319,000,000
Fixed Income Investments [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Realized Investment Gains (Losses) | $ 0 | $ 1,000,000 |

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