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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Vendor Reserves) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Jun. 30, 2019
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Accounting Policies [Abstract] |  |
Vendor reserves | $ 77 | $ 53

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- Definition Total of reserves, relating to vendor disputes or deductions, that are netted against vendor liabilities in the ordinary course of business. + References No definition available. + Details
Name: | cah_VendorReserves
Namespace Prefix: | cah_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration