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Document and Entity Information (USD $)
 12 Months Ended
Jun. 30, 2014
Jul. 31, 2014
Dec. 31, 2013
Document and Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Trading Symbol cah    
Entity Registrant Name CARDINAL HEALTH INC    
Entity Central Index Key 0000721371    
Current Fiscal Year End Date --06-30    
Entity Current Reporting Status Yes    
Entity Well-Known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Public Float     $ 22,846,077,361
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   336,654,178