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Goodwill and Other Intangible Assets (Schedule of Goodwill by Reportable Segment) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
--- | ---
Dec. 31, 2014
Goodwill |
Beginning Balance | $ 4,878 us-gaap_Goodwill
Goodwill acquired, net of purchase price adjustments | 71 us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation adjustments and other | (20)us-gaap_GoodwillTranslationAdjustments
Ending Balance | 4,929 us-gaap_Goodwill
Pharmaceutical |
Goodwill |
Beginning Balance | 2,158 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember
Goodwill acquired, net of purchase price adjustments | 21 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember
Foreign currency translation adjustments and other | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember
Ending Balance | 2,179 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cah_PharmaceuticalMember
Medical |
Goodwill |
Beginning Balance | 2,720 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember
Goodwill acquired, net of purchase price adjustments | 50 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember
Foreign currency translation adjustments and other | (20)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = cah_MedicalMember
Ending Balance | $ 2,750 us-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
Name: | us-gaap_GoodwillAcquiredDuringPeriod
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
Name: | us-gaap_GoodwillTranslationAdjustments
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: |