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Debt And Financing Activities (Accounts Receivable Facilities, Revolving Credit Facilities and Lines of Credit) (Narrative) (Details) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Mar. 31, 2015 Bilateral Lines of Credit [Member] USD ($) | Mar. 31, 2014 Bilateral Lines of Credit [Member] USD ($) | Mar. 31, 2015 Accounts Receivable Sales Facility [Member] USD ($) | Mar. 31, 2014 Accounts Receivable Sales Facility [Member] USD ($) | Mar. 31, 2013 Accounts Receivable Sales Facility [Member] USD ($) | Mar. 31, 2015 Accounts Receivable Factoring Facility [Member] USD ($) | Mar. 31, 2014 Accounts Receivable Factoring Facility [Member] USD ($) | Mar. 31, 2015 Revolving Credit Facility [Member] USD ($) | Mar. 31, 2014 Revolving Credit Facility [Member] USD ($) | Mar. 31, 2013 Revolving Credit Facility [Member] USD ($) | Mar. 31, 2014 Foreign Line of Credit [Member] USD ($) | Mar. 31, 2015 Celesio [Member] Revolving Credit Facility [Member] USD ($) | Mar. 31, 2014 Celesio [Member] Revolving Credit Facility [Member] USD ($) | Mar. 31, 2015 Celesio [Member] Revolving Credit Facility [Member] EUR (€) | Mar. 31, 2015 Floating Rate Notes Due September 10, 2015 [Member] | Mar. 31, 2014 Floating Rate Notes Due September 10, 2015 [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 10, 2015 | Sep. 10, 2015
Credit facility expiration period |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity | $ 1,400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = mck_BilateralLinesofCreditMember |  | $ 1,350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = mck_AccountsReceivableSalesFacilityMember |  |  | $ 169,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = mck_AccountsReceivableFactoringFacilityMember |  | $ 1,300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  | € 500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_BusinessAcquisitionAxis = mck_CelesioMember / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Credit facility expiration date |  |  | Nov. 30, 2016 |  |  | Jan. 31, 2016 |  | Sep. 23, 2016 |  |  |  | Feb. 28, 2018 |  |  |  |
Proceeds from lines of credit | 225,000,000us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = mck_BilateralLinesofCreditMember |  | 0us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = mck_AccountsReceivableSalesFacilityMember | 550,000,000us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = mck_AccountsReceivableSalesFacilityMember | 1,325,000,000us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = mck_AccountsReceivableSalesFacilityMember | 2,875,000,000us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = mck_AccountsReceivableFactoringFacilityMember | 570,000,000us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = mck_AccountsReceivableFactoringFacilityMember | 0us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 0us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 0us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 0us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember | 0us-gaap_ProceedsFromLinesOfCredit / us-gaap_BusinessAcquisitionAxis = mck_CelesioMember / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 0us-gaap_ProceedsFromLinesOfCredit / us-gaap_BusinessAcquisitionAxis = mck_CelesioMember / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Repayments of lines of credit | 267,000,000us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = mck_BilateralLinesofCreditMember |  | 0us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = mck_AccountsReceivableSalesFacilityMember | 550,000,000us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = mck_AccountsReceivableSalesFacilityMember | 1,725,000,000us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = mck_AccountsReceivableSalesFacilityMember | 2,908,000,000us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = mck_AccountsReceivableFactoringFacilityMember | 575,000,000us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = mck_AccountsReceivableFactoringFacilityMember |  |  |  |  |  |  |  |  |
Other Short-term Borrowings | 29,000,000us-gaap_OtherShortTermBorrowings / us-gaap_CreditFacilityAxis = mck_BilateralLinesofCreditMember | 65,000,000us-gaap_OtherShortTermBorrowings / us-gaap_CreditFacilityAxis = mck_BilateralLinesofCreditMember | 0us-gaap_OtherShortTermBorrowings / us-gaap_CreditFacilityAxis = mck_AccountsReceivableSalesFacilityMember | 0us-gaap_OtherShortTermBorrowings / us-gaap_CreditFacilityAxis = mck_AccountsReceivableSalesFacilityMember |  | 135,000,000us-gaap_OtherShortTermBorrowings / us-gaap_CreditFacilityAxis = mck_AccountsReceivableFactoringFacilityMember | 246,000,000us-gaap_OtherShortTermBorrowings / us-gaap_CreditFacilityAxis = mck_AccountsReceivableFactoringFacilityMember |  |  |  |  |  |  |  |  |
Pledged Assets, Not Separately Reported, Finance Receivables |  |  | 0us-gaap_PledgedAssetsNotSeparatelyReportedFinanceReceivables / us-gaap_CreditFacilityAxis = mck_AccountsReceivableSalesFacilityMember | 0us-gaap_PledgedAssetsNotSeparatelyReportedFinanceReceivables / us-gaap_CreditFacilityAxis = mck_AccountsReceivableSalesFacilityMember |  | 135,000,000us-gaap_PledgedAssetsNotSeparatelyReportedFinanceReceivables / us-gaap_CreditFacilityAxis = mck_AccountsReceivableFactoringFacilityMember | 246,000,000us-gaap_PledgedAssetsNotSeparatelyReportedFinanceReceivables / us-gaap_CreditFacilityAxis = mck_AccountsReceivableFactoringFacilityMember |  |  |  |  |  |  |  |  |
Credit facility outstanding, long-term |  |  |  |  |  |  |  | $ 0us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | $ 0us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  | $ 0us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember | $ 0us-gaap_LineOfCredit / us-gaap_BusinessAcquisitionAxis = mck_CelesioMember / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | $ 0us-gaap_LineOfCredit / us-gaap_BusinessAcquisitionAxis = mck_CelesioMember / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Interest rate, minimum | 0.20%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = mck_BilateralLinesofCreditMember |  |  |  |  | 0.85%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = mck_AccountsReceivableFactoringFacilityMember |  |  |  |  |  |  |  |  |  |
Interest rate, maximum | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_CreditFacilityAxis = mck_BilateralLinesofCreditMember |  |  |  |  | 1.26%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_CreditFacilityAxis = mck_AccountsReceivableFactoringFacilityMember |  |  |  |  |  |  |  |  |  |

X
- Definition Maximum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Minimum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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- Definition Sum of the carrying amounts at the balance sheet date of short-term borrowings not otherwise specified in the taxonomy having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 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 210.5-02.19(a)(7)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of finance receivables which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720971&loc=SL6224234-111729 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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