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Income Taxes (Components Of Deferred Tax Assets and Liabilities) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax liabilities [Abstract]    
Unearned premium reserve $ 196mbi_DeferredTaxLiabilitiesUnearnedPremiumRevenue $ 220mbi_DeferredTaxLiabilitiesUnearnedPremiumRevenue
Deferral of cancellation of indebtedness income 91mbi_DeferredTaxLiabilitiesDeferralOfCodIncome 114mbi_DeferredTaxLiabilitiesDeferralOfCodIncome
Deferred acquisition costs 72us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost 87us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost
Net unrealized gains in accumulated other comprehensive income 4us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome 0us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Basis difference in foreign subsidiaries 59us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 48us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Other 1us-gaap_DeferredTaxLiabilitiesOther 9us-gaap_DeferredTaxLiabilitiesOther
Total gross deferred tax liabilities 423us-gaap_DeferredIncomeTaxLiabilities 478us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets [Abstract]    
Compensation and employee benefits 30us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 31us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Loss and loss adjustment expense reserves 69us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves 85us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Net operating loss and tax credit carryforwards 1,150mbi_DeferredTaxAssetsNolsAndTaxCreditCarryforwards 917mbi_DeferredTaxAssetsNolsAndTaxCreditCarryforwards
Capital loss carryforward and other-than-temporary impairments 6mbi_DeferredTaxAssetsCapitalLossCarryforwardsAndOtherThanTemporaryImpairments 93mbi_DeferredTaxAssetsCapitalLossCarryforwardsAndOtherThanTemporaryImpairments
Net unrealized losses on insured derivatives 93mbi_DeferredTaxAssetsInsuredDerivatives 400mbi_DeferredTaxAssetsInsuredDerivatives
Net losses on financial instruments at fair value and foreign exchange 37us-gaap_DeferredTaxAssetsDerivativeInstruments 47us-gaap_DeferredTaxAssetsDerivativeInstruments
Net unrealized losses in accumulated other comprehensive income 0us-gaap_DeferredTaxAssetsOtherComprehensiveLoss 30us-gaap_DeferredTaxAssetsOtherComprehensiveLoss
Alternative minimum tax credit carryforward 22us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 22us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Net deferred taxes on VIEs 25mbi_DeferredTaxAssetsVariableInterestEntities 55mbi_DeferredTaxAssetsVariableInterestEntities
Total gross deferred tax assets 1,432us-gaap_DeferredTaxAssetsGross 1,680us-gaap_DeferredTaxAssetsGross
Valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowance 93us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset $ 1,009us-gaap_DeferredTaxAssetsLiabilitiesNet $ 1,109us-gaap_DeferredTaxAssetsLiabilitiesNet