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Redeemable Noncontrolling Interests (Narrative) (Details)
3 Months Ended 9 Months Ended
Dec. 31, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2014
Celesio [Member]
USD ($)
Dec. 31, 2014
Celesio [Member]
USD ($)
Dec. 31, 2014
Celesio [Member]
EUR (€)
Mar. 31, 2014
Celesio [Member]
USD ($)
Redeemable Noncontrolling Interest [Line Items]            
Guaranteed dividend amount     $ 36,000,000mck_GuaranteedDividendAmount
/ dei_LegalEntityAxis
= mck_CelesioMember
$ 50,000,000mck_GuaranteedDividendAmount
/ dei_LegalEntityAxis
= mck_CelesioMember
   
Reclassification from permanent to temporary equity       1,500,000,000mck_ReclassificationtoTemporaryEquity
/ dei_LegalEntityAxis
= mck_CelesioMember
   
Redeemable NCI, carrying value 1,461,000,000us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount 0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount 1,500,000,000us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount
/ dei_LegalEntityAxis
= mck_CelesioMember
1,500,000,000us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount
/ dei_LegalEntityAxis
= mck_CelesioMember
  0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount
/ dei_LegalEntityAxis
= mck_CelesioMember
Redeemable NCI, redemption value     $ 1,400,000,000mck_RedeemableNoncontrollingInterestsMaximumRedemptionValue
/ dei_LegalEntityAxis
= mck_CelesioMember
$ 1,400,000,000mck_RedeemableNoncontrollingInterestsMaximumRedemptionValue
/ dei_LegalEntityAxis
= mck_CelesioMember
   
Redeemable NCI, recurring compensation per share         € 0.83mck_AnnualRecurringCompensationtoNCIUnderDominationAgreementPerShare
/ dei_LegalEntityAxis
= mck_CelesioMember