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Subsequent Events Rehabilitation Exit Transaction (Details) - Subsequent Event [Member] | Feb. 12, 2018 USD ($)
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One Time Interest Payment on Surplus Notes | $ 13,501,000
Deferred Payment Obligation [Member] |
One Dollar Outstanding | 1.00
Cash Payment Amount | 0.40
Payment Amount in New Secured Notes | 0.41
Payment Amount in Existing Surplus Notes | 0.125
Discount Amount | 0.065
Ambac [Member] | Deferred Payment Obligation [Member] |
One Dollar Outstanding | 1.00
Payment Amount in New Secured Notes | 0.91
Discount Amount | 0.09
Ambac [Member] |
One Time Interest Payment on Surplus Notes | $ 2,618,000

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

X
- 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 One Time Interest Payment on Surplus Notes + References No definition available. + Details
Name: | ambc_OneTimeInterestPaymentonSurplusNotes
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

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ambc_AmbacMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |