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Commitments, Contingent Liabilities and Litigation (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Mar. 01, 2015
Loss Contingencies          
Proceeds from Litigation Settlements $ 14,000,000us-gaap_ProceedsFromLegalSettlements $ 9,000,000us-gaap_ProceedsFromLegalSettlements $ 14,000,000us-gaap_ProceedsFromLegalSettlements $ 24,000,000us-gaap_ProceedsFromLegalSettlements  
DEA Investigation and Related Matters [Member]          
Loss Contingencies          
Litigation Charges 0us-gaap_LegalFees
/ us-gaap_LitigationCaseAxis
= cah_DEAInvestigationandRelatedMattersMember
  34,000,000us-gaap_LegalFees
/ us-gaap_LitigationCaseAxis
= cah_DEAInvestigationandRelatedMattersMember
   
Litigation Accrual 34,000,000us-gaap_LitigationReserve
/ us-gaap_LitigationCaseAxis
= cah_DEAInvestigationandRelatedMattersMember
  34,000,000us-gaap_LitigationReserve
/ us-gaap_LitigationCaseAxis
= cah_DEAInvestigationandRelatedMattersMember
   
State of West Virginia vs Cardinal Health, Inc          
Loss Contingencies          
Loss Contingency, Number of Defendants     13us-gaap_LossContingencyNumberOfDefendants
/ us-gaap_LitigationCaseAxis
= cah_StateOfWestVirginiaVsCardinalHealthIncMember
   
FTC Investigation [Member]          
Loss Contingencies          
Litigation Charges     27,000,000us-gaap_LegalFees
/ us-gaap_LitigationCaseAxis
= cah_FTCInvestigationMember
   
CVS Health Corporation Member [Domain]          
Red Oak Sourcing Establishment Date     July 2014    
Red Oak Sourcing Initial Term     10 years    
Number Of Quarterly Payments To CVS 39cah_NumberOfQuarterlyPaymentsToCVS
/ us-gaap_MajorCustomersAxis
= cah_CVSHealthCorporationMemberDomain
       
Quarterly Payment To CVS 25,600,000cah_QuarterlyPaymentstoCVS
/ us-gaap_MajorCustomersAxis
= cah_CVSHealthCorporationMemberDomain
       
Quarterly Payment To CVS Commencement Date October 2014        
Cordis [Member]          
Business Acquisition, Binding Offer Date         Mar. 01, 2015
Binding Offer Payment to Acquire Business         $ 1,900,000,000cah_BindingOfferPaymenttoAcquireBusiness
/ us-gaap_BusinessAcquisitionAxis
= cah_CordisMember