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Consolidated Statements Of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Premiums, fees and reimbursements received $ 193us-gaap_ProceedsFromInsurancePremiumsCollected $ 185us-gaap_ProceedsFromInsurancePremiumsCollected $ 281us-gaap_ProceedsFromInsurancePremiumsCollected
Investment income received 419us-gaap_ProceedsFromInterestAndDividendsReceived 426us-gaap_ProceedsFromInterestAndDividendsReceived 594us-gaap_ProceedsFromInterestAndDividendsReceived
Errors and omissions insurance recoveries received 30us-gaap_ProceedsFromInsuranceSettlementOperatingActivities 0us-gaap_ProceedsFromInsuranceSettlementOperatingActivities 0us-gaap_ProceedsFromInsuranceSettlementOperatingActivities
Insured derivative commutations and losses paid (432)mbi_PaymentsForNetRealizedLossesOnInsuredDerivativesPaid (458)mbi_PaymentsForNetRealizedLossesOnInsuredDerivativesPaid (464)mbi_PaymentsForNetRealizedLossesOnInsuredDerivativesPaid
Financial guarantee losses and loss adjustment expenses paid (240)us-gaap_PaymentsForLossesAndLossAdjustmentExpense (443)us-gaap_PaymentsForLossesAndLossAdjustmentExpense (895)us-gaap_PaymentsForLossesAndLossAdjustmentExpense
Proceeds from recoveries and reinsurance 131mbi_ProceedsFromReinsuranceAndRecoveries 2,621mbi_ProceedsFromReinsuranceAndRecoveries 263mbi_ProceedsFromReinsuranceAndRecoveries
Operating and employee related expenses paid (238)us-gaap_PaymentsForOperatingActivities (277)us-gaap_PaymentsForOperatingActivities (400)us-gaap_PaymentsForOperatingActivities
Interest paid, net of interest converted to principal (179)us-gaap_InterestPaidNet (224)us-gaap_InterestPaidNet (400)us-gaap_InterestPaidNet
Income taxes (paid) received (17)us-gaap_IncomeTaxesPaidNet (1)us-gaap_IncomeTaxesPaidNet (6)us-gaap_IncomeTaxesPaidNet
Net cash provided (used) by operating activities (333)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 1,829us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (1,027)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Purchases of available-for-sale investments (1,494)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (2,397)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (3,086)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Sales of available-for-sale investments 757us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 1,726us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 4,658us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Paydowns and maturities of available-for-sale investments 484us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 452us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 609us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Purchases of investments at fair value (631)mbi_PaymentsToAcquireFairValueOptionAndTradingSecurities (371)mbi_PaymentsToAcquireFairValueOptionAndTradingSecurities (346)mbi_PaymentsToAcquireFairValueOptionAndTradingSecurities
Sales, paydowns and maturities of investments at fair value 789mbi_ProceedsFromSalesMaturitiesAndPaydownsOfFairValueAndTradingSecurities 595mbi_ProceedsFromSalesMaturitiesAndPaydownsOfFairValueAndTradingSecurities 960mbi_ProceedsFromSalesMaturitiesAndPaydownsOfFairValueAndTradingSecurities
Sales, paydowns and maturities (purchases) of short-term investments, net 515us-gaap_PaymentsForProceedsFromShortTermInvestments (358)us-gaap_PaymentsForProceedsFromShortTermInvestments 739us-gaap_PaymentsForProceedsFromShortTermInvestments
Sales, paydowns and maturities of held-to-maturity investments 44us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities 28us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities 1,014us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities
Sales, paydowns and maturities of other investments 1mbi_ProceedsFromSalesMaturitiesPrepaymentsAndCallsOfOtherInvestments 0mbi_ProceedsFromSalesMaturitiesPrepaymentsAndCallsOfOtherInvestments 0mbi_ProceedsFromSalesMaturitiesPrepaymentsAndCallsOfOtherInvestments
Purchases of loans receivable (310)us-gaap_PaymentsToAcquireLoansReceivable 0us-gaap_PaymentsToAcquireLoansReceivable 0us-gaap_PaymentsToAcquireLoansReceivable
Paydowns and maturities of loans receivable 313us-gaap_ProceedsFromSaleAndCollectionOfLoansReceivable 280us-gaap_ProceedsFromSaleAndCollectionOfLoansReceivable 278us-gaap_ProceedsFromSaleAndCollectionOfLoansReceivable
Consolidation of variable interest entities including cash acquired 221mbi_ProceedsFromConsolidationOfVariableInterestEntity 0mbi_ProceedsFromConsolidationOfVariableInterestEntity 0mbi_ProceedsFromConsolidationOfVariableInterestEntity
Deconsolidation of variable interest entities 18mbi_PaymentsForDeconsolidationOfVariableInterestEntity (26)mbi_PaymentsForDeconsolidationOfVariableInterestEntity (51)mbi_PaymentsForDeconsolidationOfVariableInterestEntity
(Payments) proceeds for derivative settlements (26)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities (54)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities (288)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities
Collateral (to) from swap counterparty 144us-gaap_IncreaseDecreaseCashCollateralFromCounterparties 122us-gaap_IncreaseDecreaseCashCollateralFromCounterparties (285)us-gaap_IncreaseDecreaseCashCollateralFromCounterparties
Capital expenditures (13)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (7)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash provided (used) by investing activities 812us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (6)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 4,195us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Proceeds from investment agreements 30us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt 31us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt 36us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
Principal paydowns of investment agreements (192)us-gaap_RepaymentsOfOtherLongTermDebt (285)us-gaap_RepaymentsOfOtherLongTermDebt (688)us-gaap_RepaymentsOfOtherLongTermDebt
Principal paydowns of medium-term notes (168)us-gaap_RepaymentsOfMediumTermNotes (197)us-gaap_RepaymentsOfMediumTermNotes (102)us-gaap_RepaymentsOfMediumTermNotes
Principal paydowns of variable interest entity notes (609)us-gaap_RepaymentsOfNotesPayable (1,112)us-gaap_RepaymentsOfNotesPayable (1,229)us-gaap_RepaymentsOfNotesPayable
Proceeds from issuance of variable interest entity notes 79us-gaap_ProceedsFromNotesPayable 0us-gaap_ProceedsFromNotesPayable 0us-gaap_ProceedsFromNotesPayable
Payments for securities sold under agreements to repurchase 0us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase 0us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase (287)us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase
Payments for retirement of debt 0us-gaap_RepaymentsOfLongTermDebt (3)us-gaap_RepaymentsOfLongTermDebt (540)us-gaap_RepaymentsOfLongTermDebt
Purchases of treasury stock (32)us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock
Change in noncontrolling interest and (purchase)/redemption of subsidiary preferred stock 0us-gaap_PaymentsToMinorityShareholders 0us-gaap_PaymentsToMinorityShareholders (2)us-gaap_PaymentsToMinorityShareholders
Restricted stock awards settlements 0us-gaap_ProceedsFromStockPlans 0us-gaap_ProceedsFromStockPlans 1us-gaap_ProceedsFromStockPlans
Net cash provided (used) by financing activities (892)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (1,566)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (2,811)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash and cash equivalents (8)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations 11us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Net increase (decrease) in cash and cash equivalents (421)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 268us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 357us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents - beginning of year 1,258us-gaap_CashAndCashEquivalentsAtCarryingValue 990us-gaap_CashAndCashEquivalentsAtCarryingValue 633us-gaap_CashAndCashEquivalentsAtCarryingValue
Reclassification to assets held for sale (55)us-gaap_CashIncludingDiscontinuedOperations 0us-gaap_CashIncludingDiscontinuedOperations 0us-gaap_CashIncludingDiscontinuedOperations
Cash and cash equivalents - end of year 782us-gaap_CashAndCashEquivalentsAtCarryingValue 1,258us-gaap_CashAndCashEquivalentsAtCarryingValue 990us-gaap_CashAndCashEquivalentsAtCarryingValue
Reconciliation of net income (loss) to net cash provided (used) by operating activities: [Abstract]      
Net income (loss) 569us-gaap_NetIncomeLoss 250us-gaap_NetIncomeLoss 1,234us-gaap_NetIncomeLoss
Change in: [Abstract]      
Premiums receivable 138us-gaap_IncreaseDecreaseInPremiumsReceivable 176us-gaap_IncreaseDecreaseInPremiumsReceivable 152us-gaap_IncreaseDecreaseInPremiumsReceivable
Deferred acquisition costs 43us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts 43us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts 49us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts
Unearned premium revenue (412)us-gaap_IncreaseDecreaseInUnearnedPremiums (506)us-gaap_IncreaseDecreaseInUnearnedPremiums (600)us-gaap_IncreaseDecreaseInUnearnedPremiums
Loss and loss adjustment expense reserves (133)us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve (216)us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve 17us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve
Insurance loss recoverable 162mbi_IncreaseDecreaseInInsuranceLossRecoverable 3,637mbi_IncreaseDecreaseInInsuranceLossRecoverable (602)mbi_IncreaseDecreaseInInsuranceLossRecoverable
Accrued interest payable 106us-gaap_IncreaseDecreaseInInterestPayableNet 106us-gaap_IncreaseDecreaseInInterestPayableNet (3)us-gaap_IncreaseDecreaseInInterestPayableNet
Accrued expenses (36)us-gaap_IncreaseDecreaseInAccruedLiabilities 43us-gaap_IncreaseDecreaseInAccruedLiabilities (23)us-gaap_IncreaseDecreaseInAccruedLiabilities
Net investment losses related to other-than-temporary impairments 15mbi_NetOtherThanTemporaryImpairments 0mbi_NetOtherThanTemporaryImpairments 105mbi_NetOtherThanTemporaryImpairments
Realized (gains) losses and other settlements on insured derivatives 30mbi_RealizedGainsLossesAndOtherSettlementsOnInsuredDerivativesTotal 0mbi_RealizedGainsLossesAndOtherSettlementsOnInsuredDerivativesTotal 0mbi_RealizedGainsLossesAndOtherSettlementsOnInsuredDerivativesTotal
Unrealized (gains) losses on insured derivatives (903)us-gaap_UnrealizedGainLossOnDerivatives (1,777)us-gaap_UnrealizedGainLossOnDerivatives (1,870)us-gaap_UnrealizedGainLossOnDerivatives
Net (gains) losses on financial instruments at fair value and foreign exchange (128)mbi_IncreaseDecreaseInNetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange (244)mbi_IncreaseDecreaseInNetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange (73)mbi_IncreaseDecreaseInNetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange
Other net realized (gains) losses (25)mbi_IncreaseDecreaseInOtherNetRealizedGainsLosses 28mbi_IncreaseDecreaseInOtherNetRealizedGainsLosses (7)mbi_IncreaseDecreaseInOtherNetRealizedGainsLosses
Deferred income tax provision (benefit) 50us-gaap_DeferredIncomeTaxExpenseBenefit 157us-gaap_DeferredIncomeTaxExpenseBenefit 365us-gaap_DeferredIncomeTaxExpenseBenefit
(Gains) losses on extinguishment of debt 0mbi_AdjustmentGainsLossesOnExtinguishmentOfDebt (61)mbi_AdjustmentGainsLossesOnExtinguishmentOfDebt (49)mbi_AdjustmentGainsLossesOnExtinguishmentOfDebt
Interest on variable interest entities, net 77mbi_VieInterestNet 90mbi_VieInterestNet 140mbi_VieInterestNet
Other operating 114us-gaap_OtherNoncashIncomeExpense 103us-gaap_OtherNoncashIncomeExpense 138us-gaap_OtherNoncashIncomeExpense
Total adjustments to net income (loss) (902)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 1,579us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities (2,261)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided (used) by operating activities $ (333)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ 1,829us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ (1,027)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations