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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
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Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2014
Loss Contingencies |  |  |
Proceeds from Litigation Settlements | $ 16 us-gaap_ProceedsFromLegalSettlements |  |
DEA Investigation and Related Matters [Member] |  |  |
Loss Contingencies |  |  |
Litigation Charges |  | 7 us-gaap_LegalFees / us-gaap_LitigationCaseAxis = cah_DEAInvestigationandRelatedMattersMember | 34 us-gaap_LegalFees / us-gaap_LitigationCaseAxis = cah_DEAInvestigationandRelatedMattersMember
Litigation Accrual |  | 34 us-gaap_LitigationReserve / us-gaap_LitigationCaseAxis = cah_DEAInvestigationandRelatedMattersMember | 34 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 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 |  | $ 25.6 cah_QuarterlyPaymentstoCVS / us-gaap_MajorCustomersAxis = cah_CVSHealthCorporationMemberDomain |
Quarterly Payment To CVS Commencement Date |  | October 2014 |

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- Definition The date we established Red Oak Sourcing, LLC ("Red Oak Sourcing"), a U.S.-based generic pharmaceutical sourcing entity with CVS Health Corporation ("CVS"). + References No definition available. + Details
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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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