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Segment Information (Revenue 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 Information |  |  |  |  |  |  |  |
Revenue | $ 25,375 us-gaap_Revenues |  | $ 21,427 us-gaap_Revenues |  | $ 74,983 us-gaap_Revenues |  | $ 68,190 us-gaap_Revenues |
Pharmaceutical |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |
Revenue | 22,605 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember |  | 18,762 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember |  | 66,440 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember | [1] | 60,018 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember | [1]
Medical |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |
Revenue | 2,774 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember |  | 2,657 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember |  | 8,540 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember |  | 8,168 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember |
Reportable Segments |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |
Revenue | 25,379 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |  | 21,419 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |  | 74,980 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |  | 68,186 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] | $ 8 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | [2] | $ 3 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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