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Segments of Business (Segment Assets and Property, Plant and Equipment, Net by Geographica Ares) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
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Segment Reporting Information [Line Items] |  |  |  |
Assets | $ 53,870us-gaap_Assets | $ 51,759us-gaap_Assets |  |
Cash and cash equivalents | 5,341us-gaap_CashAndCashEquivalentsAtCarryingValue | 4,193us-gaap_CashAndCashEquivalentsAtCarryingValue | 2,456us-gaap_CashAndCashEquivalentsAtCarryingValue | 3,149us-gaap_CashAndCashEquivalentsAtCarryingValue
Property, plant and equipment, net | 2,045us-gaap_PropertyPlantAndEquipmentNet | 2,196us-gaap_PropertyPlantAndEquipmentNet |  |
United States [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property, plant and equipment, net | 1,273us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 1,246us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |  |
Foreign [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property, plant and equipment, net | 772us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = mck_AllOtherMember | 950us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = mck_AllOtherMember |  |
Distribution Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Assets | 43,982us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember | 42,496us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mck_DistributionSolutionsMember |  |
Technology Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Assets | 3,281us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember | 3,573us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mck_TechnologySolutionsMember |  |
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Assets | 47,263us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 46,069us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |  |
Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other | $ 1,266us-gaap_OtherAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 1,497us-gaap_OtherAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 7 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Details
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