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Variable Interest Entities (Summary Of Nonconsolidated VIEs Assets And Liabilities) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Variable Interest Entity [Line Items]      
Premiums receivable $ 875us-gaap_PremiumsReceivableAtCarryingValue $ 1,051us-gaap_PremiumsReceivableAtCarryingValue $ 1,228us-gaap_PremiumsReceivableAtCarryingValue
Derivative liabilities 246us-gaap_DerivativeLiabilities 1,200us-gaap_DerivativeLiabilities  
Collateralized Debt Obligations [Member]      
Variable Interest Entity [Line Items]      
VIE Assets 8,613us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
12,565us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
 
Maximum Exposure to Loss 5,623us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
7,693us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
 
Investments 110us-gaap_Investments
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
[1] 120us-gaap_Investments
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
[1]  
Premiums receivable 24us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
[2] 43us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
[2]  
Unearned premium revenue 20us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
[3] 37us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
[3]  
Loss and loss adjustment expense reserves 70us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
21us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
 
Derivative liabilities 102us-gaap_DerivativeLiabilities
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
[4] 108us-gaap_DerivativeLiabilities
/ invest_InvestmentAxis
= us-gaap_CollateralizedDebtObligationsMember
[4]  
Residential Mortgage Backed Securities [Member]      
Variable Interest Entity [Line Items]      
VIE Assets 14,136us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
21,738us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Maximum Exposure to Loss 7,459us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
9,251us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Investments 9us-gaap_Investments
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
[1] 10us-gaap_Investments
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
[1]  
Premiums receivable 41us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
[2] 53us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
[2]  
Insurance loss recoverable 518mbi_InsuranceLossRecoverable
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
[5] 658mbi_InsuranceLossRecoverable
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
[5]  
Unearned premium revenue 39us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
[3] 51us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
[3]  
Loss and loss adjustment expense reserves 307us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
[6] 327us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Derivative liabilities   5us-gaap_DerivativeLiabilities
/ invest_InvestmentAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
[4]  
Commercial Mortgage Backed Securities [Member]      
Variable Interest Entity [Line Items]      
VIE Assets 571us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
1,367us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Maximum Exposure to Loss 279us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
447us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Premiums receivable 1us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
[2] 1us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
[2]  
Unearned premium revenue 1us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
[3] 1us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
[3]  
Consumer Asset Backed [Member]      
Variable Interest Entity [Line Items]      
VIE Assets 6,008us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= mbi_ConsumerAssetBackedMember
7,830us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= mbi_ConsumerAssetBackedMember
 
Maximum Exposure to Loss 1,989us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= mbi_ConsumerAssetBackedMember
2,740us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= mbi_ConsumerAssetBackedMember
 
Investments   9us-gaap_Investments
/ invest_InvestmentAxis
= mbi_ConsumerAssetBackedMember
[1]  
Premiums receivable 16us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= mbi_ConsumerAssetBackedMember
[2] 19us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= mbi_ConsumerAssetBackedMember
[2]  
Unearned premium revenue 14us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= mbi_ConsumerAssetBackedMember
[3] 19us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= mbi_ConsumerAssetBackedMember
[3]  
Loss and loss adjustment expense reserves 12us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ invest_InvestmentAxis
= mbi_ConsumerAssetBackedMember
[6] 13us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ invest_InvestmentAxis
= mbi_ConsumerAssetBackedMember
 
Corporate Asset Backed [Member]      
Variable Interest Entity [Line Items]      
VIE Assets 6,612us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= mbi_CorporateAssetBackedMember
13,028us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= mbi_CorporateAssetBackedMember
 
Maximum Exposure to Loss 4,608us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= mbi_CorporateAssetBackedMember
7,248us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= mbi_CorporateAssetBackedMember
 
Investments   2us-gaap_Investments
/ invest_InvestmentAxis
= mbi_CorporateAssetBackedMember
[1]  
Premiums receivable 41us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= mbi_CorporateAssetBackedMember
[2] 80us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= mbi_CorporateAssetBackedMember
[2]  
Insurance loss recoverable 6mbi_InsuranceLossRecoverable
/ invest_InvestmentAxis
= mbi_CorporateAssetBackedMember
[5] 18mbi_InsuranceLossRecoverable
/ invest_InvestmentAxis
= mbi_CorporateAssetBackedMember
[5]  
Unearned premium revenue 47us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= mbi_CorporateAssetBackedMember
[3] 96us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= mbi_CorporateAssetBackedMember
[3]  
Global Structured Finance [Member]      
Variable Interest Entity [Line Items]      
VIE Assets 35,940us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
56,528us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
 
Maximum Exposure to Loss 19,958us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
27,379us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
 
Investments 119us-gaap_Investments
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
[1] 141us-gaap_Investments
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
[1]  
Premiums receivable 123us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
[2] 196us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
[2]  
Insurance loss recoverable 524mbi_InsuranceLossRecoverable
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
[5] 676mbi_InsuranceLossRecoverable
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
[5]  
Unearned premium revenue 121us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
[3] 204us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
[3]  
Loss and loss adjustment expense reserves 389us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
[6] 361us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
 
Derivative liabilities 102us-gaap_DerivativeLiabilities
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
[4] 113us-gaap_DerivativeLiabilities
/ invest_InvestmentAxis
= mbi_GlobalStructuredFinanceMember
[4]  
Global Public Finance [Member]      
Variable Interest Entity [Line Items]      
VIE Assets 49,686us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= mbi_GlobalPublicFinanceMember
52,317us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= mbi_GlobalPublicFinanceMember
 
Maximum Exposure to Loss 16,698us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= mbi_GlobalPublicFinanceMember
20,162us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= mbi_GlobalPublicFinanceMember
 
Premiums receivable 179us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= mbi_GlobalPublicFinanceMember
[2] 206us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= mbi_GlobalPublicFinanceMember
[2]  
Unearned premium revenue 211us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= mbi_GlobalPublicFinanceMember
[3] 248us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= mbi_GlobalPublicFinanceMember
[3]  
Loss and loss adjustment expense reserves   5us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ invest_InvestmentAxis
= mbi_GlobalPublicFinanceMember
 
Total Insurance [Member]      
Variable Interest Entity [Line Items]      
VIE Assets 85,626us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
108,845us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
 
Maximum Exposure to Loss 36,656us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
47,541us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
 
Investments 119us-gaap_Investments
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
[1] 141us-gaap_Investments
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
[1]  
Premiums receivable 302us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
[2] 402us-gaap_PremiumsReceivableAtCarryingValue
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
[2]  
Insurance loss recoverable 524mbi_InsuranceLossRecoverable
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
[5] 676mbi_InsuranceLossRecoverable
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
[5]  
Unearned premium revenue 332us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
[3] 452us-gaap_UnearnedPremiums
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
[3]  
Loss and loss adjustment expense reserves 389us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
[6] 366us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
 
Derivative liabilities $ 102us-gaap_DerivativeLiabilities
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
[4] $ 113us-gaap_DerivativeLiabilities
/ invest_InvestmentAxis
= mbi_TotalInsuranceMember
[4]  
[1]
Reported within Investments on MBIA's consolidated balance sheets.
[2]
Reported within Premiums receivable on MBIA's consolidated balance sheets.
[3]
Reported within Unearned premium revenue on MBIA's consolidated balance sheets.
[4]
Reported within Derivative liabilities on MBIA's consolidated balance sheets.
[5]
Reported within Insurance loss recoverable on MBIA's consolidated balance sheets.
[6]
Reported within Loss and loss adjustment expense reserves on MBIA's consolidated balance sheets.