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Goodwill and Intangible Assets, Net (Changes In The Carrying Amount Of Goodwill) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Goodwill [Line Items] |  |
Goodwill, beginning balance | $ 9,927us-gaap_Goodwill | $ 6,405us-gaap_Goodwill
Goodwill acquired | 93us-gaap_GoodwillAcquiredDuringPeriod | 3,649us-gaap_GoodwillAcquiredDuringPeriod
Amount reclassified to assets held-for-sale | (15)us-gaap_IncreaseDecreaseInAssetsHeldForSale | (128)us-gaap_IncreaseDecreaseInAssetsHeldForSale
Acquisition accounting, transfers and other adjustments | 625us-gaap_GoodwillPurchaseAccountingAdjustments | 1us-gaap_GoodwillPurchaseAccountingAdjustments
Foreign currency translation adjustments, net | (813)us-gaap_GoodwillTranslationAdjustments | 0us-gaap_GoodwillTranslationAdjustments
Goodwill, ending balance | 9,817us-gaap_Goodwill | 9,927us-gaap_Goodwill
Distribution Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, beginning balance | 8,078us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 4,413us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember
Goodwill acquired | 93us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 3,649us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember
Amount reclassified to assets held-for-sale | (14)us-gaap_IncreaseDecreaseInAssetsHeldForSale / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | (1)us-gaap_IncreaseDecreaseInAssetsHeldForSale / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember
Acquisition accounting, transfers and other adjustments | 625us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 13us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember
Foreign currency translation adjustments, net | (788)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 4us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember
Goodwill, ending balance | 7,994us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 8,078us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember
Technology Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, beginning balance | 1,849us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | 1,992us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember
Goodwill acquired | 0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | 0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember
Amount reclassified to assets held-for-sale | (1)us-gaap_IncreaseDecreaseInAssetsHeldForSale / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | (127)us-gaap_IncreaseDecreaseInAssetsHeldForSale / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember
Acquisition accounting, transfers and other adjustments | 0us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | (12)us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember
Foreign currency translation adjustments, net | (25)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | (4)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember
Goodwill, ending balance | $ 1,823us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | $ 1,849us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The increase (decrease) during the period in book value of long-lived assets that the reporting entity plans to sell within one year (or one business cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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