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Special Purpose Entities, Including Variable Interest Entities - Summary of Carrying Amount of Assets, Liabilities and Maximum Exposure to Loss of Ambac's Variable Interests in Non-Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Variable Interest Entities [Line Items] |  |
Maximum Exposure To Loss | $ 20,109 | $ 20,861
Insurance Assets | 331 | 351
Insurance Liabilities | 742 | 836
Derivative Liabilities | 0 |
Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Derivative Liabilities |  | 0
Global Public Finance [Member] |  |
Variable Interest Entities [Line Items] |  |
Maximum Exposure To Loss | 17,101 | 17,498
Insurance Assets | 204 | 209
Insurance Liabilities | 196 | 202
Derivative Liabilities | 0 | 0
Global Structured Finance [Member] |  |
Variable Interest Entities [Line Items] |  |
Maximum Exposure To Loss | 3,007 | 3,364
Insurance Assets | 127 | 141
Insurance Liabilities | 546 | 634
Derivative Liabilities | 0 | 0
Global Structured Finance [Member] | Residential Mortgage-Backed Securities [Member] |  |
Variable Interest Entities [Line Items] |  |
Maximum Exposure To Loss | 2,224 | 2,391
Insurance Assets | 123 | 135
Insurance Liabilities | 409 | 432
Derivative Liabilities | 0 | 0
Global Structured Finance [Member] | Other Consumer Asset-Backed [Member] |  |
Variable Interest Entities [Line Items] |  |
Maximum Exposure To Loss | 365 | 540
Insurance Assets | 3 | 5
Insurance Liabilities | 135 | 200
Derivative Liabilities | 0 | 0
Global Structured Finance [Member] | Other [Member] |  |
Variable Interest Entities [Line Items] |  |
Maximum Exposure To Loss | 418 | 433
Insurance Assets | 2 | 2
Insurance Liabilities | 2 | 2
Derivative Liabilities | $ 0 | $ 0

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- Definition The net carrying amount of derivative assets or liabilities in the reporting entity's statement of financial position that relate to the entity's variable interests in Variable Interest Entities (VIEs) where the VIEs are not consolidated. + References No definition available. + Details
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- Definition The carrying amount of insurance assets in the reporting entity's statement of financial position that relate to the entity's variable interests in Variable Interest Entities (VIEs) where the VIEs are not consolidated. + References No definition available. + Details
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- Definition The carrying amount of insurance liabilities in the reporting entity's statement of financial position that relate to the entity's variable interests in Variable Interest Entities (VIEs) where the VIEs are not consolidated. + References No definition available. + Details
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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -Publisher FASB -URI https://asc.fasb.org//1943274/2147481203/810-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481203/810-10-50-6 + Details
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