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Insurance Regulations And Dividends (Narrative) (Detail) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2012
Insurance Regulations And Dividends [Line Items] |  |  |
Percentage of policyholders' surplus | 10.00%mbi_PercentageOfPolicyholdersSurplus |  |
Percentage of adjusted net investment income | 100.00%mbi_PercentageOfAdjustedNetInvestmentIncome |  |
Maximum percentage of notional asset swap | 5.00%mbi_MaximumPercentageOfNotionalAssetSwap |  |
Minimum [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Policyholders' surplus | $ 65,000,000 mbi_StatutoryAccountingPracticesSurplus / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
MBIA Corp [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Requested contingency reserve release to surplus |  |  | 1,100,000,000 mbi_RequestedContingencyReserveReleaseToSurplus / dei_LegalEntityAxis = mbi_MbiaCorpMember
Statutory net loss | 35,000,000 mbi_StatutoryAccountingPracticesStatutoryNetLossAmount / dei_LegalEntityAxis = mbi_MbiaCorpMember | 494,000,000 mbi_StatutoryAccountingPracticesStatutoryNetLossAmount / dei_LegalEntityAxis = mbi_MbiaCorpMember |
Statutory capital | 859,000,000 mbi_StatutoryAccountingPracticesCapital / dei_LegalEntityAxis = mbi_MbiaCorpMember | 825,000,000 mbi_StatutoryAccountingPracticesCapital / dei_LegalEntityAxis = mbi_MbiaCorpMember |
Policyholders' surplus | 542,000,000 mbi_StatutoryAccountingPracticesSurplus / dei_LegalEntityAxis = mbi_MbiaCorpMember |  |
Contingency reserves | 317,000,000 mbi_StatutoryAccountingPracticesContingencyReserves / dei_LegalEntityAxis = mbi_MbiaCorpMember |  |
MBIA Corp [Member] | Minimum Surplus And Contingency Reserves [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Investments in certain qualifing assets | 100.00%mbi_InvestmentsInCertainQualifingAssets / dei_LegalEntityAxis = mbi_MbiaCorpMember / us-gaap_StatementEquityComponentsAxis = mbi_MinimumSurplusAndContingencyReservesMember |  |
MBIA Corp [Member] | Loss Reserves And Unearned Premium Reserves [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Investments in certain qualifing assets | 50.00%mbi_InvestmentsInCertainQualifingAssets / dei_LegalEntityAxis = mbi_MbiaCorpMember / us-gaap_StatementEquityComponentsAxis = mbi_LossReservesAndUnearnedPremiumReservesMember |  |
MBIA Corp [Member] | Policyholders Surplus [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Statutory surplus negative impact | 106,000,000 mbi_StatutorySurplusNegativeImpact / dei_LegalEntityAxis = mbi_MbiaCorpMember / us-gaap_StatementEquityComponentsAxis = mbi_PolicyholdersSurplusMember |  |
Maximum percentage of statutory admitted assets invested in subsidiaries | 50.00%mbi_MaximumPercentageOfStatutoryAdmittedAssetsInvestedInSubsidiaries / dei_LegalEntityAxis = mbi_MbiaCorpMember / us-gaap_StatementEquityComponentsAxis = mbi_PolicyholdersSurplusMember |  |
MBIA Corp [Member] | Surplus [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Maximum percentage of statutory admitted assets invested in subsidiaries | 60.00%mbi_MaximumPercentageOfStatutoryAdmittedAssetsInvestedInSubsidiaries / dei_LegalEntityAxis = mbi_MbiaCorpMember / us-gaap_StatementEquityComponentsAxis = mbi_SurplusMember |  |
National [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Dividends from subsidiaries | 220,000,000 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = mbi_NationalMember |  |
Statutory capital | 3,300,000,000 mbi_StatutoryAccountingPracticesCapital / dei_LegalEntityAxis = mbi_NationalMember | 3,300,000,000 mbi_StatutoryAccountingPracticesCapital / dei_LegalEntityAxis = mbi_NationalMember |
Policyholders' surplus | 2,200,000,000 mbi_StatutoryAccountingPracticesSurplus / dei_LegalEntityAxis = mbi_NationalMember |  |
Contingency reserves | 1,100,000,000 mbi_StatutoryAccountingPracticesContingencyReserves / dei_LegalEntityAxis = mbi_NationalMember |  |
Statutory net income | $ 238,000,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = mbi_NationalMember | $ 256,000,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = mbi_NationalMember |

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