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v2.4.1.9

Income Taxes (Components Of Deferred Tax Balances) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014
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Income Tax Disclosure [Abstract] |  |
Receivable allowances | $ 83us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | $ 94us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Deferred revenue | 72us-gaap_DeferredTaxAssetsDeferredIncome | 136us-gaap_DeferredTaxAssetsDeferredIncome
Compensation and benefit related accruals | 681us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | 632us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Net operating loss and credit carryforwards | 316us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 337us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Other | 266us-gaap_DeferredTaxAssetsOther | 287us-gaap_DeferredTaxAssetsOther
Subtotal | 1,418us-gaap_DeferredTaxAssetsGross | 1,486us-gaap_DeferredTaxAssetsGross
Less: valuation allowance | (229)us-gaap_DeferredTaxAssetsValuationAllowance | (200)us-gaap_DeferredTaxAssetsValuationAllowance
Total assets | 1,189us-gaap_DeferredTaxAssetsNet | 1,286us-gaap_DeferredTaxAssetsNet
Inventory valuation and other assets | (2,333)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts | (2,161)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts
Fixed assets and systems development costs | (324)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (320)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangibles | (1,073)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | (1,477)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Other | (61)us-gaap_DeferredTaxLiabilitiesOther | (117)us-gaap_DeferredTaxLiabilitiesOther
Total liabilities | (3,791)us-gaap_DeferredIncomeTaxLiabilities | (4,075)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability | (2,602)us-gaap_DeferredTaxLiabilities | (2,789)us-gaap_DeferredTaxLiabilities
Current net deferred tax asset | 26us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 42us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Current net deferred tax liability | (1,819)mck_DeferredTaxLiabilitiesGrossNetByJurisdiction | (1,588)mck_DeferredTaxLiabilitiesGrossNetByJurisdiction
Long-term deferred tax asset | 50us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | 19us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Long-term deferred tax liability | $ (859)us-gaap_DeferredTaxLiabilitiesNoncurrent | $ (1,262)us-gaap_DeferredTaxLiabilitiesNoncurrent

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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