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Debt And Financing Activities (Senior Bridge Term Loan Facility) (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2013 | Feb. 28, 2013 | Dec. 31, 2012
Senior Bridge Term Loan Agreement, 2014 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility borrowing capacity | $ 5,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = mck_SeniorBridgeTermLoanAgreement2014Member |  |  |  |
Credit facility expiration period | 364 days |  |  |  |
Proceeds from lines of credit |  | 4,957,000,000us-gaap_ProceedsFromLinesOfCredit / us-gaap_LongtermDebtTypeAxis = mck_SeniorBridgeTermLoanAgreement2014Member |  |  |
Repayments of lines of credit |  | 4,076,000,000us-gaap_RepaymentsOfLinesOfCredit / us-gaap_LongtermDebtTypeAxis = mck_SeniorBridgeTermLoanAgreement2014Member |  |  |
Credit facility interest rate |  | 1.39%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = mck_SeniorBridgeTermLoanAgreement2014Member |  |  |
Debt issuance costs |  | 46,000,000us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = mck_SeniorBridgeTermLoanAgreement2014Member |  |  |
Senior Bridge Term Loan Agreement, 2013 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility borrowing capacity |  |  |  | 900,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = mck_SeniorBridgeTermLoanAgreement2013Member | 2,100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = mck_SeniorBridgeTermLoanAgreement2013Member
Proceeds from lines of credit |  |  | 900,000,000us-gaap_ProceedsFromLinesOfCredit / us-gaap_LongtermDebtTypeAxis = mck_SeniorBridgeTermLoanAgreement2013Member |  |
Repayments of lines of credit |  |  | 900,000,000us-gaap_RepaymentsOfLinesOfCredit / us-gaap_LongtermDebtTypeAxis = mck_SeniorBridgeTermLoanAgreement2013Member |  |
Credit facility interest rate |  |  | 1.20%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = mck_SeniorBridgeTermLoanAgreement2013Member |  |
Debt issuance costs |  |  | $ 11,000,000us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = mck_SeniorBridgeTermLoanAgreement2013Member |  |

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- Definition Represents the charge against earnings during the period for commitment fees and debt issuance expenses. + 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 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -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 The effective interest rate during the reporting period. + 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 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 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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