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Commitments And Contingencies (Detail) | 1 Months Ended
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Sep. 17, 2012 Security
Commitments And Contingencies [Line Items] |
Number of insured mortgage-backed securitizations | 7

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- Details
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Namespace Prefix: | mbi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Loss Contingency, Complaints Filed Against Number of Mortgage-Backed Securitizations + References No definition available. + Details
Name: | mbi_LossContingencyComplaintsFiledAgainstNumberOfMortgageBackedSecuritizations
Namespace Prefix: | mbi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration