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Goodwill and Other Intangible Assets (Schedule of Goodwill by Reportable Segment) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Mar. 31, 2015
Goodwill
Beginning Balance	$ 4,878us-gaap_Goodwill
Goodwill acquired, net of purchase price adjustments	206us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation adjustments and other	(29)us-gaap_GoodwillTranslationAdjustments
Ending Balance	5,055us-gaap_Goodwill
Pharmaceutical
Goodwill
Beginning Balance	2,158us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember
Goodwill acquired, net of purchase price adjustments	20us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember
Foreign currency translation adjustments and other	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember
Ending Balance	2,178us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember
Medical
Goodwill
Beginning Balance	2,720us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember
Goodwill acquired, net of purchase price adjustments	186us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember
Foreign currency translation adjustments and other	(29)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember
Ending Balance	$ 2,877us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_GoodwillRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cah_MedicalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cah_PharmaceuticalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: