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Segment Information (Segment Profit by Reportable Segment) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating earnings | $ 591 us-gaap_OperatingIncomeLoss | $ 508 us-gaap_OperatingIncomeLoss | $ 1,603 us-gaap_OperatingIncomeLoss | $ 1,498 us-gaap_OperatingIncomeLoss
Pharmaceutical |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating earnings | 567 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember | 452 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember | 1,559 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember | 1,368 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember
Medical |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating earnings | 102 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember | 111 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember | 330 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember | 348 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember
Reportable Segments |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating earnings | 669 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 563 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 1,889 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 1,716 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Corporate |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating earnings | $ (78)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | $ (55)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | $ (286)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | $ (218)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember

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