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Stockholders' Equity (Other Comprehensive Income (Loss), Net of Tax) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Stockholders' Equity Note [Abstract]      
Foreign currency translation adjustments arising during period, net of income tax expense (benefit) of nil, nil and ($2) (1) $ (1,845)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax [1] $ 9us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax [1] $ (52)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax [1]
Reclassified to income statement, net of income tax expense of nil, $24 and nil (2) (10)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [2] 44us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [2] 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [2]
Foreign currency translation adjustments, net of income tax expense (benefit) of $24, ($2) and $2 (1,855)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 53us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (52)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Unrealized losses on cash flow hedges arising during period, net of income tax benefit of nil, nil and nil (13)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (6)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassified to income statement, net of income tax expense of nil, nil and nil 3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Unrealized losses on cash flow hedges, net of tax (10)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (6)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Net actuarial gain (loss) and prior service credit (cost) arising during period, net of income tax (benefit) of ($66), $16 and ($22) (140)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 17us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax (40)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Amortization of actuarial loss, prior service cost and transition obligation, net of income tax expense of $6, $12 and $12 (3) 11mck_DefinedBenefitPlanAmortizationofActuarialLossPriorServiceCostandTransitionObligationIncomeTaxExpenseBenefit [3] 22mck_DefinedBenefitPlanAmortizationofActuarialLossPriorServiceCostandTransitionObligationIncomeTaxExpenseBenefit [3] 18mck_DefinedBenefitPlanAmortizationofActuarialLossPriorServiceCostandTransitionObligationIncomeTaxExpenseBenefit [3]
Foreign currency translation adjustments and other, net of income tax expense of nil, nil and nil 4mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansNetOfTax (4)mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansNetOfTax 4mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansNetOfTax
Reclassified to income statement, net of income tax expense of nil, $1 and nil 1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax 1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax
Retirement related benefit plans, net of income tax expense (benefit) of ($10), ($10) and ($9) (124)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 36us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (18)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other Comprehensive Income (Loss), Net of Tax $ (1,989)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ 83us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (70)us-gaap_OtherComprehensiveIncomeLossNetOfTax
[1] 2015 includes net foreign currency translation losses of $267 million and 2014 includes net foreign currency translations gains of $21 million attributable to noncontrolling and redeemable noncontrolling interests.
[2] 2014 includes net foreign currency translation losses of $44 million reclassified from accumulated other comprehensive income to other income (loss), net, within our consolidated statement of operations due to the sale of our 49% equity interest in Nadro. Such losses were previously considered in our impairment evaluation of the investment when we committed to a plan to sell the investment during the fourth quarter of 2013 and, accordingly, did not impact earnings in 2014.
[3] Pre-tax amount was reclassified into cost of sales and operating expenses in the consolidated statements of operations. The related tax expense was reclassified into income tax expense in the consolidated statements of operations.