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Supplementary Consolidated Financial Statement Schedule Valuation And Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Year | $ 134us-gaap_ValuationAllowancesAndReservesBalance | [1] | $ 136us-gaap_ValuationAllowancesAndReservesBalance | [1] | $ 125us-gaap_ValuationAllowancesAndReservesBalance |
Charged to Costs and Expense | 75us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 36us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 32us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |
Charged to Other Accounts | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts | [2] | (1)us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts | [2] | 17us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts | [2]
Deductions From Allowance Accounts | (35)us-gaap_ValuationAllowancesAndReservesDeductions | [3] | (37)us-gaap_ValuationAllowancesAndReservesDeductions | [3] | (38)us-gaap_ValuationAllowancesAndReservesDeductions | [3]
Balance at End of Year | 174us-gaap_ValuationAllowancesAndReservesBalance | [1] | 134us-gaap_ValuationAllowancesAndReservesBalance | [1] | 136us-gaap_ValuationAllowancesAndReservesBalance | [1]
Allowance for Doubtful Accounts [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Year | 112us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [1] | 121us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [1] | 111us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Charged to Costs and Expense | 67us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 36us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 28us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Charged to Other Accounts | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [2] | (11)us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [2] | 16us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [2]
Deductions From Allowance Accounts | (38)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [3] | (34)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [3] | (34)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [3]
Balance at End of Year | 141us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [1] | 112us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [1] | 121us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [1]
Other Allowances [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at Beginning of Year | 22us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember | [1] | 15us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember | [1] | 14us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember |
Charged to Costs and Expense | 8us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember |  | 0us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember |  | 4us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember |
Charged to Other Accounts | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember | [2] | 10us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember | [2] | 1us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember | [2]
Deductions From Allowance Accounts | 3us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember | [3] | (3)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember | [3] | (4)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember | [3]
Balance at End of Year | 33us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember | [1] | 22us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember | [1] | 15us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_OtherAllowancesMember | [1]
Written Off [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Deductions From Allowance Accounts | (34)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_ValuationAllowancesAndReservesDeductionsWrittenOffMember |  | (39)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_ValuationAllowancesAndReservesDeductionsWrittenOffMember |  | (38)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_ValuationAllowancesAndReservesDeductionsWrittenOffMember |
Credited To Other Accounts [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Deductions From Allowance Accounts | (1)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_ValuationAllowancesAndReservesDeductionsCreditedToOtherAccountsMember |  | 2us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_ValuationAllowancesAndReservesDeductionsCreditedToOtherAccountsMember |  | 0us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_ValuationAllowancesAndReservesDeductionsCreditedToOtherAccountsMember |
Amounts Shown As Deductions From Current And Non-Current Receivables [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at End of Year | $ 174us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_CurrentAndNonCurrentReceivablesMember |  | $ 134us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_CurrentAndNonCurrentReceivablesMember |  | $ 136us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = mck_CurrentAndNonCurrentReceivablesMember |
[1] | Amounts shown as deductions from current and non - current receivables [$0], $136, $125.
[2] | Primarily represents reclassifications from other balance sheet accounts.
[3] | Deductions:Written off - [($0)], ($38), ($44)Credited to other accounts - [($0)], ($0), ($6)Total - [($0)], ($38), ($50)

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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