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Background and Business Description Rehabilitation Exit Support Agreement (Details) | Feb. 12, 2018 USD ($)
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Deferred Payment Obligation [Member] |
Discount Amount | $ 0.065
Surplus Notes [Member] |
Cash Payment Amount | 0.40
Payment Amount in New Secured Notes | 0.41
Payment Amount in Existing Surplus Notes | 0.125
satisfaction and discharge of segregated account deferred amounts | 3,857,000,000
Cancellation of Surplus Notes Principal | 552,000,000
Cancellation of Surplus Notes Accrued Interest | 257,000,000
Ambac Assurance [Member] |
Secured Notes Received from Ambac LSNI | 644,000,000
Ambac [Member] | Deferred Payment Obligation [Member] |
One Dollar Outstanding | 1.00
Discount Amount | 0.09
Payment Amount in New Secured Notes | 0.91
AFG [Member] |
Secured Notes Received from Ambac LSNI | 125,000,000
Ambac LSNI Secured Note [Domain] |
AMBAC LSNI Secured Note | $ 2,154,000,000

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- Definition AMBAC LSNI Secured Note + References No definition available. + Details
Name: | ambc_AMBACLSNISecuredNote
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cancellation of Surplus Notes Accrued Interest + References No definition available. + Details
Name: | ambc_CancellationofSurplusNotesAccruedInterest
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cancellation of Surplus Notes Principal + References No definition available. + Details
Name: | ambc_CancellationofSurplusNotesPrincipal
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash Payment Amount + References No definition available. + Details
Name: | ambc_CashPaymentAmount
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Discount Amount + References No definition available. + Details
Name: | ambc_DiscountAmount
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition One Dollar Outstanding + References No definition available. + Details
Name: | ambc_OneDollarOutstanding
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Payment Amount in Existing Surplus Notes + References No definition available. + Details
Name: | ambc_PaymentAmountinExistingSurplusNotes
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Payment Amount in New Secured Notes + References No definition available. + Details
Name: | ambc_PaymentAmountinNewSecuredNotes
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Satisfaction and discharge of segregated account deferred amounts and deferred interest + References No definition available. + Details
Name: | ambc_Satisfactionanddischargeofsegregatedaccountdeferredamountsanddeferredinterest
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Secured Notes Received from Ambac LSNI + References No definition available. + Details
Name: | ambc_SecuredNotesReceivedfromAmbacLSNI
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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- Details
Name: | dei_LegalEntityAxis=ambc_AmbacAssuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=ambc_AmbacMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | dei_LegalEntityAxis=ambc_AfgMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ambc_AmbacLSNISecuredNoteDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |