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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Vendor Reserves) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Accounting Policies [Abstract]
Vendor reserves	$ 45	$ 50

X

- 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