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