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Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (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
Jun. 30, 2014
Amortization of Intangible Assets $ 48us-gaap_AmortizationOfIntangibleAssets $ 46us-gaap_AmortizationOfIntangibleAssets $ 140us-gaap_AmortizationOfIntangibleAssets $ 138us-gaap_AmortizationOfIntangibleAssets  
Indefinite-life intangibles:          
Indefinite-Lived Intangible Assets, Gross 15cah_IndefiniteLivedIntangibleAssetsGross   15cah_IndefiniteLivedIntangibleAssetsGross   14cah_IndefiniteLivedIntangibleAssetsGross
Indefinite-Lived Intangible Assets, Accumulated Amortization 0cah_IndefiniteLivedIntangibleAssetsAccumulatedAmortization   0cah_IndefiniteLivedIntangibleAssetsAccumulatedAmortization   0cah_IndefiniteLivedIntangibleAssetsAccumulatedAmortization
Indefinite-Lived Intangible Assets (Excluding Goodwill) 15us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill   15us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill   14us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Definite-life intangibles:          
Finite-Lived Intangible Assets, Gross 1,637us-gaap_FiniteLivedIntangibleAssetsGross   1,637us-gaap_FiniteLivedIntangibleAssetsGross   1,514us-gaap_FiniteLivedIntangibleAssetsGross
Finite-Lived Intangible Assets, Accumulated Amortization 674us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   674us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   536us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Finite-Lived Intangible Assets, Net 963us-gaap_FiniteLivedIntangibleAssetsNet   963us-gaap_FiniteLivedIntangibleAssetsNet   978us-gaap_FiniteLivedIntangibleAssetsNet
Intangible Assets, Gross 1,652cah_TotalIntangiblesGross   1,652cah_TotalIntangiblesGross   1,528cah_TotalIntangiblesGross
Total Intangibles, Accumulated Amortization 674cah_TotalIntangiblesAccumulatedAmortization   674cah_TotalIntangiblesAccumulatedAmortization   536cah_TotalIntangiblesAccumulatedAmortization
Intangible Assets, Net (Excluding Goodwill) 978us-gaap_IntangibleAssetsNetExcludingGoodwill   978us-gaap_IntangibleAssetsNetExcludingGoodwill   992us-gaap_IntangibleAssetsNetExcludingGoodwill
Customer relationships          
Definite-life intangibles:          
Finite-Lived Intangible Assets, Gross 1,088us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  1,088us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  1,043us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Finite-Lived Intangible Assets, Accumulated Amortization 466us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  466us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  388us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Finite-Lived Intangible Assets, Net 622us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  622us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  655us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Trademarks, trade names and patents          
Definite-life intangibles:          
Finite-Lived Intangible Assets, Gross 229us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cah_TrademarksAndPatentsMember
  229us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cah_TrademarksAndPatentsMember
  213us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cah_TrademarksAndPatentsMember
Finite-Lived Intangible Assets, Accumulated Amortization 84us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cah_TrademarksAndPatentsMember
  84us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cah_TrademarksAndPatentsMember
  69us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cah_TrademarksAndPatentsMember
Finite-Lived Intangible Assets, Net 145us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cah_TrademarksAndPatentsMember
  145us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cah_TrademarksAndPatentsMember
  144us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cah_TrademarksAndPatentsMember
Developed technology and other          
Definite-life intangibles:          
Finite-Lived Intangible Assets, Gross 320us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  320us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  258us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Finite-Lived Intangible Assets, Accumulated Amortization 124us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  124us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  79us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Finite-Lived Intangible Assets, Net 196us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  196us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  179us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Trademarks and other          
Indefinite-life intangibles:          
Indefinite-Lived Intangible Assets, Gross 15cah_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
  15cah_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
  14cah_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Indefinite-Lived Intangible Assets, Accumulated Amortization 0cah_IndefiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
  0cah_IndefiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
  0cah_IndefiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 15us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
  $ 15us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
  $ 14us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember