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Loss And Loss Adjustment Expense Reserves (Schedule Of Company's Second-Lien RMBS Exposure, Gross Undiscounted Claim Liability And Potential Recoveries, Before The Elimination Of Amounts Related To Consolidated VIE's) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Loss And Loss Adjustment Expense Reserves [Line Items]
Outstanding Gross Principal	$ 11,263us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingPrincipal	[1]	$ 14,264us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingPrincipal	[1]
Gross Interest	4,620us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingInterest	[1]	8,632us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingInterest	[1]
Gross Undiscounted Claim Liability	850us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationGrossClaimLiability		1,235us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationGrossClaimLiability
Potential Recoveries	860us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityGrossPotentialRecoveries		1,085us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityGrossPotentialRecoveries
Insured Issues Designated As Classified List [Member] | Non Variable Interest Entities [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]
Issues	0mbi_NumberOfInsuredIssuesReviewed / mbi_ClassifiedStatusAxis = mbi_InsuredIssuesDesignatedAsClassifiedListMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = mbi_NonVariableInterestEntitiesMember
Outstanding Gross Principal	2,900us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingPrincipal / mbi_ClassifiedStatusAxis = mbi_InsuredIssuesDesignatedAsClassifiedListMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = mbi_NonVariableInterestEntitiesMember
Gross Interest	900us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingInterest / mbi_ClassifiedStatusAxis = mbi_InsuredIssuesDesignatedAsClassifiedListMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = mbi_NonVariableInterestEntitiesMember
Gross Undiscounted Claim Liability	100us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationGrossClaimLiability / mbi_ClassifiedStatusAxis = mbi_InsuredIssuesDesignatedAsClassifiedListMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = mbi_NonVariableInterestEntitiesMember
Potential Recoveries	600us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityGrossPotentialRecoveries / mbi_ClassifiedStatusAxis = mbi_InsuredIssuesDesignatedAsClassifiedListMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = mbi_NonVariableInterestEntitiesMember
Insured Issues Designated As Classified List [Member] | Variable Interest Entity Primary Beneficiary [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]
Issues	0mbi_NumberOfInsuredIssuesReviewed / mbi_ClassifiedStatusAxis = mbi_InsuredIssuesDesignatedAsClassifiedListMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Outstanding Gross Principal	1,500us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingPrincipal / mbi_ClassifiedStatusAxis = mbi_InsuredIssuesDesignatedAsClassifiedListMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Gross Interest	400us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingInterest / mbi_ClassifiedStatusAxis = mbi_InsuredIssuesDesignatedAsClassifiedListMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Gross Undiscounted Claim Liability	0us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationGrossClaimLiability / mbi_ClassifiedStatusAxis = mbi_InsuredIssuesDesignatedAsClassifiedListMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Potential Recoveries	$ 500us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityGrossPotentialRecoveries / mbi_ClassifiedStatusAxis = mbi_InsuredIssuesDesignatedAsClassifiedListMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1] Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA.

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Number Of Insured Issues Reviewed

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This element represents the gross claim liability for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 55

-Paragraph 32

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-Name Accounting Standards Codification

-Topic 944

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-Section 50

-Paragraph 9

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- Definition

This element represents the amount of insured contractual payments outstanding attributable to interest accrued on the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 55

-Paragraph 32

-URI http://asc.fasb.org/extlink&oid=6933462&loc=SL5751133-161288



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-Name Accounting Standards Codification

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-SubTopic 40

-Section 50

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- Definition

This element represents the amount of insured contractual payments outstanding attributable to the principal of the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 55

-Paragraph 32

-URI http://asc.fasb.org/extlink&oid=6933462&loc=SL5751133-161288



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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 40

-Section 50

-Paragraph 9

-Subparagraph (a)(5)(iii)

-URI http://asc.fasb.org/extlink&oid=6933314&loc=SL5749324-161292

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- Definition

This element represents the gross potential recoveries against the gross claim liability for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 55

-Paragraph 32

-URI http://asc.fasb.org/extlink&oid=6933462&loc=SL5751133-161288



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 50

-Paragraph 9

-Subparagraph (a)(5)(v)

-URI http://asc.fasb.org/extlink&oid=6933314&loc=SL5749324-161292

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