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Stockholders' Equity (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity [Line Items]        
Dividends declared per common share $ 0.24us-gaap_CommonStockDividendsPerShareDeclared $ 0.24us-gaap_CommonStockDividendsPerShareDeclared $ 0.72us-gaap_CommonStockDividendsPerShareDeclared $ 0.68us-gaap_CommonStockDividendsPerShareDeclared
Treasury stock shares acquired 0us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 200,000us-gaap_TreasuryStockSharesAcquired
Outstanding shares authorized for repurchase $ 340us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1   $ 340us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1  
OCI foreign currency translation adjustment net of tax, NCI portion 13us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest   164us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest  
Redeemable NCI, translation adjustments 39us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments   39us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments  
Net foreign currency loss, reclassified from AOCI $ 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [1] $ 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [1] $ (10)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [1] $ 44us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [1]
Old Rate Per Share [Member]        
Stockholders' Equity [Line Items]        
Dividends declared per common share       $ 0.20us-gaap_CommonStockDividendsPerShareDeclared
/ mck_DividendsRatePerShareAxis
= mck_OldRatePerShareMember
New Rate Per Share [Member]        
Stockholders' Equity [Line Items]        
Dividends declared per common share       $ 0.24us-gaap_CommonStockDividendsPerShareDeclared
/ mck_DividendsRatePerShareAxis
= mck_NewRatePerShareMember
Distribution Solutions [Member] | Nadro [Member]        
Stockholders' Equity [Line Items]        
Equity method investment, ownership percentage   49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mck_NadroMember
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMember		   49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mck_NadroMember
/ us-gaap_StatementBusinessSegmentsAxis
= mck_DistributionSolutionsMember
[1] The first nine months of 2014 reflect net foreign currency losses of $44 million reclassified from accumulated other comprehensive income to other income (loss), net, within our consolidated statement of operations due to our sale of our 49% equity interest in Nadro, S.A. de C.V.