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Capitalized Software Held for Sale (Changes in the Carrying Amount) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Capitalized Computer Software, Net [Abstract] |  |  |
Capitalized software held for sale, net at beginning of period | $ 103us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers | $ 126us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers | $ 144us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers
Amounts capitalized | 34us-gaap_CapitalizedComputerSoftwareAdditions | 40us-gaap_CapitalizedComputerSoftwareAdditions | 49us-gaap_CapitalizedComputerSoftwareAdditions
Amortization expense | (40)us-gaap_CapitalizedComputerSoftwareAmortization | (50)us-gaap_CapitalizedComputerSoftwareAmortization | (56)us-gaap_CapitalizedComputerSoftwareAmortization
Impairment charges | 0us-gaap_CapitalizedComputerSoftwareImpairments | (12)us-gaap_CapitalizedComputerSoftwareImpairments | (10)us-gaap_CapitalizedComputerSoftwareImpairments
Foreign currency translations adjustments, net | (6)mck_CapitalizedComputerSoftwareForeignCurrencyTranslationsAdjustmentsNet | (1)mck_CapitalizedComputerSoftwareForeignCurrencyTranslationsAdjustmentsNet | (1)mck_CapitalizedComputerSoftwareForeignCurrencyTranslationsAdjustmentsNet
Capitalized software held for sale, net at end of period | $ 91us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers | $ 103us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers | $ 126us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers

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- Definition Capitalized Computer Software, Foreign Currency Translations Adjustments, Net + References No definition available. + Details
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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition For each income statement presented, the amount charged to expense for write-downs of capitalized computer software costs to net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Details
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- Definition Unamortized costs incurred for development of computer software, which is to be sold, leased or otherwise marketed, after establishing technological feasibility through to the general release of the software products. Excludes capitalized costs of developing software for internal use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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