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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 | $ 14,000,000 us-gaap_ProceedsFromLegalSettlements | $ 9,000,000 us-gaap_ProceedsFromLegalSettlements | $ 14,000,000 us-gaap_ProceedsFromLegalSettlements | $ 24,000,000 us-gaap_ProceedsFromLegalSettlements |
DEA Investigation and Related Matters [Member] |  |  |  |  |
Loss Contingencies |  |  |  |  |
Litigation Charges | 0 us-gaap_LegalFees / us-gaap_LitigationCaseAxis = cah_DEAInvestigationandRelatedMattersMember |  | 34,000,000 us-gaap_LegalFees / us-gaap_LitigationCaseAxis = cah_DEAInvestigationandRelatedMattersMember |  |
Litigation Accrual | 34,000,000 us-gaap_LitigationReserve / us-gaap_LitigationCaseAxis = cah_DEAInvestigationandRelatedMattersMember |  | 34,000,000 us-gaap_LitigationReserve / us-gaap_LitigationCaseAxis = cah_DEAInvestigationandRelatedMattersMember |  |
State of West Virginia vs Cardinal Health, Inc |  |  |  |  |
Loss Contingencies |  |  |  |  |
Loss Contingency, Number of Defendants |  |  | 13 us-gaap_LossContingencyNumberOfDefendants / us-gaap_LitigationCaseAxis = cah_StateOfWestVirginiaVsCardinalHealthIncMember |  |
FTC Investigation [Member] |  |  |  |  |
Loss Contingencies |  |  |  |  |
Litigation Charges |  |  | 27,000,000 us-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 | 39 cah_NumberOfQuarterlyPaymentsToCVS / us-gaap_MajorCustomersAxis = cah_CVSHealthCorporationMemberDomain |  |  |  |
Quarterly Payment To CVS | 25,600,000 cah_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 |  |  |  |  | $ 1,900,000,000 cah_BindingOfferPaymenttoAcquireBusiness / us-gaap_BusinessAcquisitionAxis = cah_CordisMember

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