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Noncontrolling Interests Redeemable Noncontrolling Interests (Narrative) (Details)
Share data in Millions, except Per Share data, unless otherwise specified
12 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Mar. 31, 2015
Celesio [Member]
USD ($)
Jun. 30, 2014
Celesio [Member]
USD ($)
Dec. 31, 2014
Celesio [Member]
USD ($)
Mar. 31, 2015
Celesio [Member]
USD ($)
Mar. 31, 2015
Celesio [Member]
EUR (€)
Mar. 31, 2014
Celesio [Member]
USD ($)
Redeemable Noncontrolling Interest [Line Items]                
Guaranteed dividend amount     $ 12,000,000mck_GuaranteedDividendAmount
/ dei_LegalEntityAxis
= mck_CelesioMember
  $ 50,000,000mck_GuaranteedDividendAmount
/ dei_LegalEntityAxis
= mck_CelesioMember
     
RNCI, recurring compensation per share             € 0.83mck_AnnualRecurringCompensationtoNCIUnderDominationAgreementPerShare
/ dei_LegalEntityAxis
= mck_CelesioMember
 
Net income attributable to redeemable NCI           62,000,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= mck_CelesioMember
   
Reclassification from permanent to temporary equity         1,500,000,000mck_ReclassificationtoTemporaryEquity
/ dei_LegalEntityAxis
= mck_CelesioMember
1,500,000,000mck_ReclassificationtoTemporaryEquity
/ dei_LegalEntityAxis
= mck_CelesioMember
   
RNCI shares acquired, cash paid     8,000,000mck_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentConsiderationPaid
/ dei_LegalEntityAxis
= mck_CelesioMember
32,000,000mck_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentConsiderationPaid
/ dei_LegalEntityAxis
= mck_CelesioMember
       
RNCI shares acquired     0.3mck_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentCommonShares
/ dei_LegalEntityAxis
= mck_CelesioMember
1.0mck_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentCommonShares
/ dei_LegalEntityAxis
= mck_CelesioMember
       
NCI change from shares acquired (62,000,000)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent   (9,000,000)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent
/ dei_LegalEntityAxis
= mck_CelesioMember
(35,000,000)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent
/ dei_LegalEntityAxis
= mck_CelesioMember
       
Redeemable Noncontrolling Interests 1,386,000,000us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount 0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount 1,400,000,000us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount
/ dei_LegalEntityAxis
= mck_CelesioMember
    1,400,000,000us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount
/ dei_LegalEntityAxis
= mck_CelesioMember
  0us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount
/ dei_LegalEntityAxis
= mck_CelesioMember
RNCI, redemption value     1,200,000,000mck_RedeemableNoncontrollingInterestsMaximumRedemptionValue
/ dei_LegalEntityAxis
= mck_CelesioMember
    1,200,000,000mck_RedeemableNoncontrollingInterestsMaximumRedemptionValue
/ dei_LegalEntityAxis
= mck_CelesioMember
   
Recurring compensation to redeemable NCI     $ 12,000,000mck_RecurringCompensationtoRedeemableNoncontrollingInterests
/ dei_LegalEntityAxis
= mck_CelesioMember
         
RNCI ownership interest, parent     76.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= mck_CelesioMember
    76.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= mck_CelesioMember
  75.40%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= mck_CelesioMember