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Stockholders' Equity (Other Comprehensive Income (Loss), Net of Tax) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]        
Foreign currency translation adjustments arising during period, net of income tax benefit of nil, nil, nil and nil (1) $ (416)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax [1] $ (55)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax [1] $ (985)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax [1] $ (60)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax [1]
Reclassified to income statement, net of income tax expense of nil, nil, nil and $24(2) 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [2] 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [2] (10)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [2] 44us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [2]
Foreign currency translation adjustments arising during period, net of tax (416)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (55)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (995)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (16)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Unrealized losses on cash flow hedges arising during period, net of income tax expense of nil, nil, nil and nil 1us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (2)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Net actuarial loss and prior service credit arising during period, net of income tax benefit of $6, nil, $6 and nil (21)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax (21)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Amortization of actuarial loss, prior service cost and transition obligation, net of income tax expense of $2, $4, $5 and $10 (3) 3mck_DefinedBenefitPlanAmortizationofActuarialLossPriorServiceCostandTransitionObligationIncomeTaxExpenseBenefit [3] 3mck_DefinedBenefitPlanAmortizationofActuarialLossPriorServiceCostandTransitionObligationIncomeTaxExpenseBenefit [3] 9mck_DefinedBenefitPlanAmortizationofActuarialLossPriorServiceCostandTransitionObligationIncomeTaxExpenseBenefit [3] 16mck_DefinedBenefitPlanAmortizationofActuarialLossPriorServiceCostandTransitionObligationIncomeTaxExpenseBenefit [3]
Foreign currency translation adjustments, net of income tax expense of nil, nil, nil and nil 2mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansNetOfTax 1mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansNetOfTax 4mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansNetOfTax (2)mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansNetOfTax
Reclassified to income statement, net of income tax expense of nil, nil, nil and $1 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax 1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (16)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 4us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (8)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 15us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive income (loss), net of tax $ (431)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (52)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (1,004)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (3)us-gaap_OtherComprehensiveIncomeLossNetOfTax
[1] The third quarter and first nine months of 2015 include net foreign currency translation losses of $13 million and $164 million attributable to noncontrolling interests and $39 million attributable to redeemable noncontrolling interests.
[2] The first nine months of 2014 reflect net foreign currency losses of $44 million reclassified from accumulated other comprehensive income to other income (loss), net, within our consolidated statement of operations due to our sale of our 49% equity interest in Nadro, S.A. de C.V.
[3] Pre-tax amount reclassified into cost of sales and operating expenses in the condensed consolidated statements of operations. The related tax expense was reclassified into income tax expense in the consolidated statements of operations.