Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014
Amortization of Intangible Assets	$ 47us-gaap_AmortizationOfIntangibleAssets	$ 46us-gaap_AmortizationOfIntangibleAssets	$ 92us-gaap_AmortizationOfIntangibleAssets	$ 92us-gaap_AmortizationOfIntangibleAssets
Indefinite-life intangibles:
Indefinite-Lived Intangible Assets, Gross	14		14		14
Indefinite-Lived Intangible Assets, Accumulated Amortization	0		0		0
Indefinite-Lived Intangible Assets (Excluding Goodwill)	14		14		14
Definite-life intangibles:
Finite-Lived Intangible Assets, Gross	1,561		1,561		1,514
Finite-Lived Intangible Assets, Accumulated Amortization	628		628		536
Finite-Lived Intangible Assets, Net	933us-gaap_FiniteLivedIntangibleAssetsNet		933us-gaap_FiniteLivedIntangibleAssetsNet		978us-gaap_FiniteLivedIntangibleAssetsNet
Total Intangibles, Gross	1,575cah_TotalIntangiblesGross		1,575cah_TotalIntangiblesGross		1,528cah_TotalIntangiblesGross
Total Intangibles, Accumulated Amortization	628		628		536
Intangible Assets, Net (Excluding Goodwill)	947		947		992
Customer relationships
Definite-life intangibles:
Finite-Lived Intangible Assets, Gross	1,041		1,041		1,043
Finite-Lived Intangible Assets, Accumulated Amortization	434		434		388
Finite-Lived Intangible Assets, Net	607		607		655
Trademarks, trade names and patents
Definite-life intangibles:
Finite-Lived Intangible Assets, Gross	225		225		213
Finite-Lived Intangible Assets, Accumulated Amortization	79		79		69
Finite-Lived Intangible Assets, Net	146		146		144
Developed technology and other
Definite-life intangibles:
Finite-Lived Intangible Assets, Gross	295		295		258
Finite-Lived Intangible Assets, Accumulated Amortization	115		115		79
Finite-Lived Intangible Assets, Net	180		180		179
Trademarks and other
Indefinite-life intangibles:
Indefinite-Lived Intangible Assets, Gross	14		14		14
Indefinite-Lived Intangible Assets, Accumulated Amortization	0		0		0
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 14		$ 14		$ 14

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Indefinite-Lived Intangible Assets, Gross

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Total Intangible Accumulated Amortization

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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