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Commitments, Contingent Liabilities and Litigation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2014
Loss Contingencies      
Proceeds from Litigation Settlements $ 16us-gaap_ProceedsFromLegalSettlements    
DEA Investigation and Related Matters [Member]      
Loss Contingencies      
Litigation Charges   7us-gaap_LegalFees
/ us-gaap_LitigationCaseAxis
= cah_DEAInvestigationandRelatedMattersMember
34us-gaap_LegalFees
/ us-gaap_LitigationCaseAxis
= cah_DEAInvestigationandRelatedMattersMember
Litigation Accrual   34us-gaap_LitigationReserve
/ us-gaap_LitigationCaseAxis
= cah_DEAInvestigationandRelatedMattersMember
34us-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   27us-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   $ 25.6cah_QuarterlyPaymentstoCVS
/ us-gaap_MajorCustomersAxis
= cah_CVSHealthCorporationMemberDomain
 
Quarterly Payment To CVS Commencement Date   October 2014