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Discontinued Operations (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Sep. 30, 2014 | Mar. 31, 2015 | Jun. 30, 2014
Discontinued Operations Disclosures |  |  |  |  |  |
Asset fair value adjustment | $ 241us-gaap_AssetsFairValueAdjustment | $ 80us-gaap_AssetsFairValueAdjustment |  |  |  |
Gain (loss) on disposal, pre-tax | (6)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | (5)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | 0us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax |  |  |
Accumulated other comprehensive income (loss), currency translation adjustment | (1,713)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (3)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  | (1,713)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Assets held for sale | 660us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |  |  |  | 660us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |
Liabilities held for sale | 663us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |  |  |  | 663us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |
International Technology, Software [Member] |  |  |  |  |  |
Discontinued Operations Disclosures |  |  |  |  |  |
Gain (loss) on disposal, pre-tax |  |  |  | (6)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_InternationalTechnologySoftwareMember |  |
Gain (loss) on disposal, net of tax |  |  |  | (6)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_InternationalTechnologySoftwareMember |  |
Brazil Distribution [Member] |  |  |  |  |  |
Discontinued Operations Disclosures |  |  |  |  |  |
Impairment charges |  |  |  |  | 241us-gaap_AssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_BrazilDistributionMember |
Impairment charges, net of tax |  |  |  |  | 235mck_AssetImpairmentChargesAfterTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_BrazilDistributionMember |
Impairment of long-lived assets to be disposed |  |  |  |  | 31us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_BrazilDistributionMember |
Impairment in excess of carrying value, liability amount | 210mck_ImpairmentinExcessofCarryingValue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_BrazilDistributionMember |  |  |  | 210mck_ImpairmentinExcessofCarryingValue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_BrazilDistributionMember |
Accumulated other comprehensive income (loss), currency translation adjustment | 17us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_BrazilDistributionMember |  |  |  | 17us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_BrazilDistributionMember |
Hospital Automation [Member] |  |  |  |  |  |
Discontinued Operations Disclosures |  |  |  |  |  |
Gain (loss) on disposal, pre-tax |  | (5)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_HospitalAutomationMember |  |  |  |
Gain (loss) on disposal, net of tax |  | (7)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_HospitalAutomationMember |  |  |  |
Proceeds from sale |  | 55us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_HospitalAutomationMember |  |  |  |
International Technology [Member] |  |  |  |  |  |
Discontinued Operations Disclosures |  |  |  |  |  |
Impairment charges |  | 80us-gaap_AssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_InternationalTechnologyMember |  |  |  |
Impairment charges, net of tax |  | 80mck_AssetImpairmentChargesAfterTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_InternationalTechnologyMember |  |  |  |
Cost of Sales [Member] | International Technology, Workforce [Member] |  |  |  |  |  |
Discontinued Operations Disclosures |  |  |  |  |  |
Asset fair value adjustment |  |  |  |  |  | 34us-gaap_AssetsFairValueAdjustment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_InternationalTechnologyWorkforceMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Asset fair value adjustment, net of tax |  |  |  |  |  | $ 27mck_AssetsFairValueAdjustmentNetofTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_InternationalTechnologyWorkforceMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember

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