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Segment Information (Revenue by Reportable Segment) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information |  |  |  |  |  |  |  |
Revenue | $ 25,537 us-gaap_Revenues |  | $ 22,240 us-gaap_Revenues |  | $ 49,607 us-gaap_Revenues |  | $ 46,763 us-gaap_Revenues |
Pharmaceutical |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |
Revenue | 22,627 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember |  | 19,443 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember |  | 43,836 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember | [1] | 41,256 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember | [1]
Medical |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |
Revenue | 2,914 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember |  | 2,799 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember |  | 5,766 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember |  | 5,511 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember |
Reportable Segments |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |
Revenue | 25,541 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |  | 22,242 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |  | 49,602 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |  | 46,767 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |
Corporate |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |
Revenue | $ (4)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | [2] | $ (2)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | [2] | $ 5 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | [2] | $ (4)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | [2]
Walgreen Co | Pharmaceutical |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |
Contract expiration date |  |  | Aug. 31, 2013 |  |  |  |  |
[1] | Our pharmaceutical distribution contract with Walgreen Co. expired on August 31, 2013.
[2] | Corporate revenue consists of the elimination of inter-segment revenue and other revenue not allocated to the segments.

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