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Segments of Business (Schedule Of Segment Information) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 44,925us-gaap_SalesRevenueNet | $ 46,484us-gaap_SalesRevenueNet | $ 44,160us-gaap_SalesRevenueNet | $ 43,476us-gaap_SalesRevenueNet | $ 37,832us-gaap_SalesRevenueNet | $ 34,336us-gaap_SalesRevenueNet | $ 32,985us-gaap_SalesRevenueNet | $ 32,239us-gaap_SalesRevenueNet | $ 179,045us-gaap_SalesRevenueNet | [1] | $ 137,392us-gaap_SalesRevenueNet | [1] | $ 122,196us-gaap_SalesRevenueNet | [1]
Operating profit |  |  |  |  |  |  |  |  | 2,968us-gaap_OperatingIncomeLoss |  | 2,439us-gaap_OperatingIncomeLoss |  | 2,347us-gaap_OperatingIncomeLoss |
Interest Expense |  |  |  |  |  |  |  |  | (374)us-gaap_InterestAndDebtExpense |  | (300)us-gaap_InterestAndDebtExpense |  | (240)us-gaap_InterestAndDebtExpense |
Income From Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  | 2,657us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 2,171us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 1,950us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,017us-gaap_DepreciationAndAmortization | [2] | 735us-gaap_DepreciationAndAmortization | [2] | 581us-gaap_DepreciationAndAmortization | [2]
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 376us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [3] | 278us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [3] | 241us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [3]
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 142,810us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | [1] | 122,426us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | [1] | 112,102us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | [1]
Foreign [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 36,235us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mck_AllOtherMember | [1] | 14,966us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mck_AllOtherMember | [1] | 10,094us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mck_AllOtherMember | [1]
North America Distribution And Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 143,711us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_NorthAmericaDistributionAndServicesMember | [4] | 123,929us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_NorthAmericaDistributionAndServicesMember | [4] | 115,443us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_NorthAmericaDistributionAndServicesMember | [4]
International Distribution and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 26,358us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_InternationalDistributionandServicesMember | [4] | 4,485us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_InternationalDistributionandServicesMember | [4] | 0us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_InternationalDistributionandServicesMember | [4]
Medical Surgical Distribution And Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,907us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMedicalSurgicalDistributionAndServicesMember | [4] | 5,648us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMedicalSurgicalDistributionAndServicesMember | [4] | 3,603us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMedicalSurgicalDistributionAndServicesMember | [4]
Distribution Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 175,976us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | [4] | 134,062us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | [4] | 119,046us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | [4]
Operating profit |  |  |  |  |  |  |  |  | 3,047us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember |  | 2,472us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember |  | 2,195us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember |
Depreciation and amortization |  |  |  |  |  |  |  |  | 750us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | [2] | 446us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | [2] | 267us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | [2]
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 301us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | [3] | 179us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | [3] | 163us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | [3]
Technology Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,069us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember |  | 3,330us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember |  | 3,150us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember |
Operating profit |  |  |  |  |  |  |  |  | 438us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember |  | 448us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember |  | 330us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember |
Depreciation and amortization |  |  |  |  |  |  |  |  | 156us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | [2] | 169us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | [2] | 194us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | [2]
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 27us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | [3] | 47us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | [3] | 37us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | [3]
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | (454)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | (449)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | (335)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Depreciation and amortization |  |  |  |  |  |  |  |  | 111us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [2] | 120us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [2] | 120us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [2]
Expenditures for long-lived assets |  |  |  |  |  |  |  |  | 48us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [3] | 52us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [3] | 41us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | [3]
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | $ 3,485us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |  | $ 2,920us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |  | $ 2,525us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |
[1] | Net revenues were attributed to geographic areas based on the customers’ shipment locations.
[2] | Amounts primarily include amortization of acquired intangible assets purchased in connection with acquisitions, capitalized software held for sale and capitalized software for internal use.
[3] | Long-lived assets consist of property, plant and equipment.
[4] | Revenues derived from services represent less than 2% of this segment’s total revenues.

X
- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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