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Restructuring and Employee Severance (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2013
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Loss on disposal of held for sale assets | $ 18 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges | $ (9)us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges | $ 18 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges | $ (9)us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges |
Fiscal 2013 Medical Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Activities, Initiation Date |  |  |  |  | Jan. 30, 2013
Waukegan, Illinois Property [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Loss on disposal of held for sale assets | $ 1 us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = cah_WaukeganIllinoisPropertyMember |  |  |  |

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- Definition Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. + References No definition available. + Details
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- Definition Date the restructuring activities were initiated or are expected to be initiated, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Details
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