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Restructuring and Employee Severance Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Facility Exit and Other Costs | $ 142 | $ 5 | $ 10
Distributor Contract [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Facility Exit and Other Costs | $ 125 |  |

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- Definition Facility exit and other costs primarily consist of lease termination costs, accelerated depreciation, equipment relocation costs, project consulting fees and costs associated with restructuring our delivery of information technology infrastructure services. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | cah_ContractTerminationAxis=cah_DistributorContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |