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Quarterly Financial Information (Unaudited) (Narrrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2014
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
LIFO expense | $ 337us-gaap_InventoryLIFOReservePeriodCharge | $ 311us-gaap_InventoryLIFOReservePeriodCharge | $ 13us-gaap_InventoryLIFOReservePeriodCharge |  |  |  |  |  |  |  |
Claims and litigation charges | 150us-gaap_LossContingencyLossInPeriod | 68us-gaap_LossContingencyLossInPeriod | 72us-gaap_LossContingencyLossInPeriod |  |  |  |  |  |  |  |
Income tax benefit (expense) discrete items | 33mck_IncomeTaxBenefitDiscreteItems | (94)mck_IncomeTaxBenefitDiscreteItems | 29mck_IncomeTaxBenefitDiscreteItems |  |  |  |  |  |  |  |
Distribution Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
LIFO expense |  |  |  | 50us-gaap_InventoryLIFOReservePeriodCharge / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 95us-gaap_InventoryLIFOReservePeriodCharge / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 94us-gaap_InventoryLIFOReservePeriodCharge / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 98us-gaap_InventoryLIFOReservePeriodCharge / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 125us-gaap_InventoryLIFOReservePeriodCharge / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 142us-gaap_InventoryLIFOReservePeriodCharge / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 44us-gaap_InventoryLIFOReservePeriodCharge / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember |
Inventory fair value step-up reversal |  |  |  |  |  |  |  | 40mck_BusinessCombinationInventoryStepUpFairValuePretaxCharge / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember |  |  |
Inventory fair value step-up reversal, after-tax |  |  |  |  |  |  |  | 21mck_BusinessCombinationInventoryStepUpFairValueAftertaxCharge / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember |  |  |
Brazil Distribution [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charges, net of tax |  |  |  | 235mck_AssetImpairmentChargesAfterTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_BrazilDistributionMember |  |  |  |  |  |  |
International Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charges, net of tax |  | 80mck_AssetImpairmentChargesAfterTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_InternationalTechnologyMember |  |  |  |  |  |  |  |  |
Goodwill and intangible asset impairment |  |  |  |  |  |  |  |  | 80us-gaap_GoodwillAndIntangibleAssetImpairment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mck_InternationalTechnologyMember |  |
Canada Revenue Agency Assessments [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax benefit (expense) discrete items |  | 122mck_IncomeTaxBenefitDiscreteItems / us-gaap_IncomeTaxAuthorityAxis = mck_CanadaRevenueAgencyAssessmentsMember |  |  |  |  |  |  | 122mck_IncomeTaxBenefitDiscreteItems / us-gaap_IncomeTaxAuthorityAxis = mck_CanadaRevenueAgencyAssessmentsMember |  |
Celesio [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Guaranteed dividend amount |  |  |  | 12mck_GuaranteedDividendAmount / dei_LegalEntityAxis = mck_CelesioMember |  |  |  |  |  |  | 50mck_GuaranteedDividendAmount / dei_LegalEntityAxis = mck_CelesioMember
Controlled Substance Investigation [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Claims and litigation charges | $ 150us-gaap_LossContingencyLossInPeriod / us-gaap_LossContingenciesByNatureOfContingencyAxis = mck_ControlledSubstanceInvestigationMember |  |  | $ 150us-gaap_LossContingencyLossInPeriod / us-gaap_LossContingenciesByNatureOfContingencyAxis = mck_ControlledSubstanceInvestigationMember |  |  |  |  |  |  |

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