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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.