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v2.4.1.9

Noncontrolling Interests Redeemable Noncontrolling Interests (Rollforward) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Mar. 31, 2014
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling Interests | $ 84us-gaap_MinorityInterest | $ 84us-gaap_MinorityInterest |  |  | $ 1,796us-gaap_MinorityInterest
NCI, carrying value, beginning balance | 0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount |  | 0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount | 0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent | 62us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent |  |  |  |
Reclassification from Permanent Equity | 1,500mck_ReclassificationfromPermanentEquity |  |  |  |
NCI, carrying value, ending balance | 1,386us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount | 1,386us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount |  |  |
Celesio [Member] |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
NCI, carrying value, beginning balance | 0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount / dei_LegalEntityAxis = mck_CelesioMember |  | 0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount / dei_LegalEntityAxis = mck_CelesioMember | 0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount / dei_LegalEntityAxis = mck_CelesioMember |
Redeemable NCI, net income | 62us-gaap_TemporaryEquityNetIncome / dei_LegalEntityAxis = mck_CelesioMember |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 138us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = mck_CelesioMember |  |  |  |
Redeemable NCI, translation adjustments | (105)us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments / dei_LegalEntityAxis = mck_CelesioMember |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent |  | 9us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / dei_LegalEntityAxis = mck_CelesioMember | 35us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / dei_LegalEntityAxis = mck_CelesioMember |  |
Redeemable NCI, purchase of interests | (9)us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = mck_CelesioMember |  |  |  |
Reclassification from permanent to temporary equity | 1,500mck_ReclassificationtoTemporaryEquity / dei_LegalEntityAxis = mck_CelesioMember |  |  | 1,500mck_ReclassificationtoTemporaryEquity / dei_LegalEntityAxis = mck_CelesioMember |
Reclassification of temporary equity to liability | (62)mck_ReclassificationofTemporaryEquitytoLiability / dei_LegalEntityAxis = mck_CelesioMember |  |  |  |
Redeemable NCI, other changes | 0us-gaap_TemporaryEquityOtherChanges / dei_LegalEntityAxis = mck_CelesioMember |  |  |  |
NCI, carrying value, ending balance | 1,400us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount / dei_LegalEntityAxis = mck_CelesioMember | 1,400us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount / dei_LegalEntityAxis = mck_CelesioMember |  |  |
Noncontrolling Interest [Member] |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interests Excluding Redeemable Noncontrolling Interests | 5mck_NetIncomeLossAttributabletoNoncontrollingInterestsExcludingRedeemableNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Noncontrolling Interests |  |  |  |  | 1,796us-gaap_MinorityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 174us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent | 60us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Reclassification from Permanent Equity | 1,500mck_ReclassificationfromPermanentEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Reclassification from Equity to Liability | 0mck_ReclassificationfromEquitytoLiability / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Noncontrolling Interests, Changes, Other | $ (17)mck_NoncontrollingInterestsChangesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |

X
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- Definition Noncontrolling Interests, Changes, Other + References No definition available. + Details
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- Definition Reclassification from an equity account to liabilities + 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 Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + 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 210.5-02.31) -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 27 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 + Details
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- Definition Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569655-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4616395-111683 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569643-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 + 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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- Definition Adjustments to temporary equity resulting from foreign currency translation adjustments. + References No definition available. + Details
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- Definition The portion of net income or loss attributable to temporary equity interest. + References No definition available. + Details
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- Definition This element may be used to disclose other activity associated with temporary equity that is not separately disclosed. + References No definition available. + Details
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