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Noncontrolling Interests Redeemable Noncontrolling Interests (Narrative) (Details) Share data in Millions, except Per Share data, unless otherwise specified | 12 Months Ended |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Mar. 31, 2015 Celesio [Member] USD ($) | Jun. 30, 2014 Celesio [Member] USD ($) | Dec. 31, 2014 Celesio [Member] USD ($) | Mar. 31, 2015 Celesio [Member] USD ($) | Mar. 31, 2015 Celesio [Member] EUR (€) | Mar. 31, 2014 Celesio [Member] USD ($)
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Guaranteed dividend amount |  |  | $ 12,000,000mck_GuaranteedDividendAmount / dei_LegalEntityAxis = mck_CelesioMember |  | $ 50,000,000mck_GuaranteedDividendAmount / dei_LegalEntityAxis = mck_CelesioMember |  |  |
RNCI, recurring compensation per share |  |  |  |  |  |  | € 0.83mck_AnnualRecurringCompensationtoNCIUnderDominationAgreementPerShare / dei_LegalEntityAxis = mck_CelesioMember |
Net income attributable to redeemable NCI |  |  |  |  |  | 62,000,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = mck_CelesioMember |  |
Reclassification from permanent to temporary equity |  |  |  |  | 1,500,000,000mck_ReclassificationtoTemporaryEquity / dei_LegalEntityAxis = mck_CelesioMember | 1,500,000,000mck_ReclassificationtoTemporaryEquity / dei_LegalEntityAxis = mck_CelesioMember |  |
RNCI shares acquired, cash paid |  |  | 8,000,000mck_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentConsiderationPaid / dei_LegalEntityAxis = mck_CelesioMember | 32,000,000mck_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentConsiderationPaid / dei_LegalEntityAxis = mck_CelesioMember |  |  |  |
RNCI shares acquired |  |  | 0.3mck_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentCommonShares / dei_LegalEntityAxis = mck_CelesioMember | 1.0mck_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentCommonShares / dei_LegalEntityAxis = mck_CelesioMember |  |  |  |
NCI change from shares acquired | (62,000,000)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent |  | (9,000,000)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / dei_LegalEntityAxis = mck_CelesioMember | (35,000,000)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / dei_LegalEntityAxis = mck_CelesioMember |  |  |  |
Redeemable Noncontrolling Interests | 1,386,000,000us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount | 0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount | 1,400,000,000us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount / dei_LegalEntityAxis = mck_CelesioMember |  |  | 1,400,000,000us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount / dei_LegalEntityAxis = mck_CelesioMember |  | 0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount / dei_LegalEntityAxis = mck_CelesioMember
RNCI, redemption value |  |  | 1,200,000,000mck_RedeemableNoncontrollingInterestsMaximumRedemptionValue / dei_LegalEntityAxis = mck_CelesioMember |  |  | 1,200,000,000mck_RedeemableNoncontrollingInterestsMaximumRedemptionValue / dei_LegalEntityAxis = mck_CelesioMember |  |
Recurring compensation to redeemable NCI |  |  | $ 12,000,000mck_RecurringCompensationtoRedeemableNoncontrollingInterests / dei_LegalEntityAxis = mck_CelesioMember |  |  |  |  |
RNCI ownership interest, parent |  |  | 76.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = mck_CelesioMember |  |  | 76.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = mck_CelesioMember |  | 75.40%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = mck_CelesioMember

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- Definition Annual Recurring Compensation to NCI Under Domination Agreement, Per Share + References No definition available. + Details
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- Definition Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Purchase Of Interest By Parent Common Shares + References No definition available. + Details
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- Definition Consolidation, Less Than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase Of Interest By Parent, Consideration Paid + References No definition available. + Details
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- Definition Guaranteed dividend to noncontrolling interest shareholders + References No definition available. + Details
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- Definition Reclassifications into temporary equity + References No definition available. + Details
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- Definition Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591554-111686 + Details
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- Definition Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of common shares (regardless of class), limited partnership units (regardless of class), non-preferential membership interests, or any other form of common equity regardless of investee entity legal form. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 + Details
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