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Stockholders' Equity (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 26, 2013 | Jul. 25, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Apr. 30, 2015 | Jan. 31, 2013 | Apr. 30, 2012 | Sep. 30, 2013
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.24us-gaap_CommonStockDividendsPerShareDeclared | $ 0.20us-gaap_CommonStockDividendsPerShareDeclared | $ 0.96us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.92us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.80us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |  |  |  |
Stock repurchase plans approved, shares |  |  |  |  |  |  |  |  | $ 500us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 500us-gaap_StockRepurchaseProgramAuthorizedAmount1 | [1] | $ 700us-gaap_StockRepurchaseProgramAuthorizedAmount1 | [1] |
Treasury stock retired |  |  |  |  |  |  | 2us-gaap_TreasuryStockSharesRetired |  |  |  |  |  |  |
Treasury stock retired, acquired amount |  |  |  |  |  |  | 217us-gaap_TreasuryStockValueAcquiredParValueMethod |  |  |  |  |  |  |
Treasury stock retired, amount |  |  |  |  |  |  | 195us-gaap_TreasuryStockRetiredCostMethodAmount |  |  |  |  |  |  |
OCI foreign currency translation gains (losses) net of tax, NCI portion |  |  | (267)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest |  | 21us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest |  |  |  |  |  |  |  |  |
Net foreign currency gains (losses), reclassified from AOCI |  |  | $ 10us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax | [2] | $ (44)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax | [2] | $ 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax | [2] |  |  |  |  |  |
Nadro [Member] | Distribution Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in investee |  |  |  |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mck_NadroMember / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mck_NadroMember / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember |  |  |  |  |  |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mck_NadroMember / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember
[1] | This table does not include shares tendered to satisfy the exercise price in connection with cashless exercises of employee stock options or shares tendered to satisfy tax withholding obligations in connection with employee equity awards.
[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.

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