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Segment Information (Assets by Reportable Segment) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Jun. 30, 2014
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Segment Reporting Information |  |
Assets | $ 27,888 us-gaap_Assets | $ 26,033 us-gaap_Assets
Pharmaceutical |  |
Segment Reporting Information |  |
Assets | 16,655 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember | 15,361 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember
Medical |  |
Segment Reporting Information |  |
Assets | 7,183 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember | 6,768 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember
Corporate |  |
Segment Reporting Information |  |
Assets | $ 4,050 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | $ 3,904 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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