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Segment Information (Schedule of Segment Information) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]        
Revenues $ 47,005us-gaap_SalesRevenueNet $ 34,336us-gaap_SalesRevenueNet $ 135,821us-gaap_SalesRevenueNet $ 99,560us-gaap_SalesRevenueNet
Operating Income 780us-gaap_OperatingIncomeLoss 493us-gaap_OperatingIncomeLoss 2,256us-gaap_OperatingIncomeLoss 1,834us-gaap_OperatingIncomeLoss
Interest Expense (97)us-gaap_InterestAndDebtExpense (69)us-gaap_InterestAndDebtExpense (297)us-gaap_InterestAndDebtExpense (187)us-gaap_InterestAndDebtExpense
Income from Continuing Operations Before Income Taxes 696us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 418us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 2,016us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 1,656us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
North America pharmaceutical distribution and services [Member]        
Segment Reporting Information [Line Items]        
Revenues 37,398us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_NorthAmericaDistributionAndServicesMember		 [1] 32,060us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_NorthAmericaDistributionAndServicesMember		 [1] 106,850us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_NorthAmericaDistributionAndServicesMember		 [1] 92,808us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_NorthAmericaDistributionAndServicesMember		 [1]
International pharmaceutical distribution and services [Member]        
Segment Reporting Information [Line Items]        
Revenues 7,288us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_InternationalDistributionandServicesMember		 [1] 0us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_InternationalDistributionandServicesMember		 [1] 22,207us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_InternationalDistributionandServicesMember		 [1] 0us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_InternationalDistributionandServicesMember		 [1]
Distribution Solutions [Member]        
Segment Reporting Information [Line Items]        
Revenues 46,250us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMember		 [1] 33,522us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMember		 [1] 133,528us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMember		 [1] 97,094us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMember		 [1]
Operating Income 785us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMember		 [2],[3],[4] 552us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMember		 [2],[3],[4] 2,326us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMember		 [2],[3],[4] 1,856us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMember		 [2],[3],[4]
Medical-Surgical distribution & services [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,564us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMedicalSurgicalDistributionAndServicesMember		 [1] 1,462us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMedicalSurgicalDistributionAndServicesMember		 [1] 4,471us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMedicalSurgicalDistributionAndServicesMember		 [1] 4,286us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMedicalSurgicalDistributionAndServicesMember		 [1]
Technology Solutions [Member]        
Segment Reporting Information [Line Items]        
Revenues 755us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_TechnologySolutionsMember		 814us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_TechnologySolutionsMember		 2,293us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_TechnologySolutionsMember		 2,466us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mck_TechnologySolutionsMember
Operating Income 111us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mck_TechnologySolutionsMember		 [5],[6] 47us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mck_TechnologySolutionsMember		 [5],[6] 304us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mck_TechnologySolutionsMember		 [5],[6] 294us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mck_TechnologySolutionsMember		 [5],[6]
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Operating Income 896us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 599us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 2,630us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 2,150us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember
Corporate Segment [Member]        
Segment Reporting Information [Line Items]        
Corporate Expenses, Net $ (103)mck_CorporateOperatingExpenseandOtherIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 [7] $ (112)mck_CorporateOperatingExpenseandOtherIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 [7] $ (317)mck_CorporateOperatingExpenseandOtherIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 [7] $ (307)mck_CorporateOperatingExpenseandOtherIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 [7]
[1] Revenues derived from services represent less than 2% of this segment’s total revenues.
[2] Operating profit for the third quarter and first nine months of 2014 includes AWP litigation charges of $18 million and $68 million, which were recorded in operating expenses.
[3] Operating profit for the third quarter and first nine months of 2015 includes last-in-first-out (“LIFO”) inventory charges of $95 million and $287 million. Operating profit for the third quarter and first nine months of 2014 includes LIFO inventory charges of $142 million and $186 million. The charges were all recorded in cost of sales.
[4] Operating profit for the third quarter and first nine months of 2015 includes $51 million and $151 million of acquisition-related expenses, and $16 million and $38 million for the third quarter and first nine months of 2014.
[5] Operating profit for the first nine months of 2015 includes a charge of $34 million related to the retained workforce business within our International Technology business.
[6] Operating profit for the third quarter of 2014 includes product alignment charges, integration-related expenses and severance charges totaling $57 million, of which $34 million was recorded in cost of sales and $23 million was recorded in operating expenses. Operating profit for the first nine months of 2014 includes product alignment charges, integration-related expenses and severance charges totaling $60 million, of which $34 million was recorded in cost of sales and $26 million was recorded in operating expenses.
[7] Corporate expenses, net, for the third quarter and first nine months of 2015 include $1 million and $11 million of acquisition-related expenses and $25 million and $26 million for the third quarter and first nine months of 2014.