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v2.4.1.9

Other Commitments and Contingent Liabilities (Litigation Reserve and Expense) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Loss Contingencies [Line Items] |  |  |
Claims and litigation charges | $ 150us-gaap_LossContingencyLossInPeriod | $ 68us-gaap_LossContingencyLossInPeriod | $ 72us-gaap_LossContingencyLossInPeriod
Payments for Legal Settlements | 0us-gaap_PaymentsForLegalSettlements | 105us-gaap_PaymentsForLegalSettlements | 483us-gaap_PaymentsForLegalSettlements
Average Wholesale Price Litigation [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Claims and litigation charges | 0us-gaap_LossContingencyLossInPeriod / us-gaap_LossContingenciesByNatureOfContingencyAxis = mck_AverageWholesalePriceLitigationMember | 68us-gaap_LossContingencyLossInPeriod / us-gaap_LossContingenciesByNatureOfContingencyAxis = mck_AverageWholesalePriceLitigationMember | 72us-gaap_LossContingencyLossInPeriod / us-gaap_LossContingenciesByNatureOfContingencyAxis = mck_AverageWholesalePriceLitigationMember
Payments for Legal Settlements | 0us-gaap_PaymentsForLegalSettlements / us-gaap_LossContingenciesByNatureOfContingencyAxis = mck_AverageWholesalePriceLitigationMember | 105us-gaap_PaymentsForLegalSettlements / us-gaap_LossContingenciesByNatureOfContingencyAxis = mck_AverageWholesalePriceLitigationMember | 483us-gaap_PaymentsForLegalSettlements / us-gaap_LossContingenciesByNatureOfContingencyAxis = mck_AverageWholesalePriceLitigationMember
Estimated Litigation Liability |  | $ 42us-gaap_LitigationReserve / us-gaap_LossContingenciesByNatureOfContingencyAxis = mck_AverageWholesalePriceLitigationMember |

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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 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 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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Balance Type: | credit
Period Type: | duration

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