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v3.22.2

Special Purpose Entities, Including Variable Interest Entities - Additional Information (Details) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2022 USD ($) Entity consolidationVIE | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) Entity | Jun. 30, 2021 USD ($) consolidationVIE | Dec. 31, 2021 USD ($) Entity
Variable Interest Entities [Line Items] |  |  |  |  |
Variable Interest Entity Change in Fair Value of Assets and Liabilities | $ 1,000,000 | $ 2,000,000 | $ 1,000,000 | $ 1,000,000 |
Realized Investment Gains (Losses) | 7,000,000 | (2,000,000) | 17,000,000 | 1,000,000 |
Other Operating Income (Expense), Net | 1,000,000 | 1,000,000 | 3,000,000 | (1,000,000) |
Fair value of special purpose entities | 0 |  | 0 |  |
Variable Interest Entity, Measure of Activity, Income or Loss before Tax | (6,000,000) | 2,000,000 | 15,000,000 | $ 2,000,000 |
Long-term debt | $ 2,189,000,000 |  | $ 2,189,000,000 |  | $ 2,230,000,000
Number of Variable Interest Entities Consolidated During the Period |  |  | 2 | 0 |
Number of Variable Interest Entities Deconsolidated During Period | consolidationVIE | 0 |  |  | 0 |
Gain (loss) from consolidating VIEs | $ 0 | 0 | $ 28,000,000 | $ 0 |
Number of Trusts Established Resulting From Puerto Rico Restructuring Transaction |  |  | 2 |  |
Consolidated Entities [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 8 |  | 8 |  | 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 | $ (1,000,000) | 0 | $ (2,000,000) | 1,000,000 |
VIE Change in FV of Assets Liabilities, Net of Credit Risk Change | 0 | 2,000,000 | (1,000,000) | 1,000,000 |
Gross Investment Income, Operating | (1,000,000) | 2,000,000 |  |  |
Interest Expense, Long-term Debt | (5,000,000) | (1,000,000) | (7,000,000) | (3,000,000) |
Long-term debt | $ 3,340,000,000 |  | $ 3,340,000,000 |  | $ 4,216,000,000
Ambac UK [Member] | Consolidated Entities [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 5 |  | 5 |  | 5
Ambac UK [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Long-term debt | $ 3,184,000,000 |  | $ 3,184,000,000 |  | $ 4,056,000,000
Fixed Income Investments [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Gross Investment Income, Operating |  |  | (5,000,000) | 3,000,000 |
Realized Investment Gains (Losses) | 0 | $ 0 | 1,000,000 | $ 1,000,000 |
Sitka AAC Note | Ambac Assurance Corporation [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Long-term debt | 1,156,000,000 |  | 1,156,000,000 |  | 1,154,000,000
Sitka AAC Note | Afg [Member] |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |
Long-term debt | $ 74,000,000 |  | $ 74,000,000 |  | $ 0

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