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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 (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Variable Interest Entities [Line Items] |  |  |
Maximum Exposure To Loss | $ 25,112 | $ 27,998 |
Insurance Assets | 2,195 | 2,314 |
Insurance Liabilities | 1,023 | 1,122 |
Derivative Liabilities | 5 |  |
Variable Interest Entity [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Derivative Liabilities |  | 8 |
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, before Tax | 5 | (3) | $ 14
Global Structured Finance [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Maximum Exposure To Loss | 4,879 | 6,352 |
Insurance Assets | 1,949 | 2,051 |
Insurance Liabilities | 765 | 834 |
Derivative Liabilities | 5 | 8 |
Global Structured Finance [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Maximum Exposure To Loss | 3,265 | 4,308 |
Insurance Assets | 1,929 | 2,024 |
Insurance Liabilities | 521 | 580 |
Derivative Liabilities | 0 | 0 |
Global Structured Finance [Member] | Other Consumer Asset-Backed [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Maximum Exposure To Loss | 788 | 1,050 |
Insurance Assets | 17 | 24 |
Insurance Liabilities | 234 | 239 |
Derivative Liabilities | 0 | 0 |
Global Structured Finance [Member] | Other Debt Obligations [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Maximum Exposure To Loss | 826 | 994 |
Insurance Assets | 3 | 3 |
Insurance Liabilities | 10 | 15 |
Derivative Liabilities | 5 | 8 |
Global Public Finance [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Maximum Exposure To Loss | 20,233 | 21,646 |
Insurance Assets | 246 | 263 |
Insurance Liabilities | 257 | 287 |
Derivative Liabilities | $ 0 | $ 0 |

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- Definition VIE Change in FV of Assets Liabilities, Net of Credit Risk Change + References No definition available. + Details
Name: | ambc_VIEChangeinFVofAssetsLiabilitiesNetofCreditRiskChange
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | ambc_VariableInterestEntityNonconsolidatedCarryingAmountDerivativeNetAssetsOrLiabilities
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
Name: | ambc_VariableInterestEntityNonconsolidatedCarryingAmountInsuranceAssets
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
Name: | ambc_VariableInterestEntityNonconsolidatedCarryingAmountInsuranceLiabilities
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123419778&loc=d3e5747-111685 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=123419778&loc=d3e5728-111685 + Details
Name: | us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_InformationByCategoryOfDebtSecurityAxis=ambc_GlobalStructuredFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=ambc_OtherConsumerAssetBackedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_InformationByCategoryOfDebtSecurityAxis=ambc_GlobalPublicFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |