Restructuring and Employee Severance (Liabilities Associated with Restructuring and Employee Severance Activities) (Details) $ in Millions	3 Months Ended
Sep. 30, 2015 USD ($)
Employee-Related Costs
Restructuring Reserve
Beginning Balance	$ 22
Additions	5
Payments and other adjustments	(6)
Ending Balance	21
Facility Exit and Other Costs
Restructuring Reserve
Beginning Balance	0
Additions	1
Payments and other adjustments	0
Ending Balance	1
Total
Restructuring Reserve
Beginning Balance	22
Additions	6
Payments and other adjustments	(6)
Ending Balance	$ 22

Additions to restructuring reserves associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan.

No definition available.

+ Details

Name:	cah_Additionstorestructuringreserve
Namespace Prefix:	cah_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Includes the amount of cash payments, reversals and other adjustments made during the period to the amount of a previously accrued liability as the result of exit or disposal activities.

+ References

No definition available.

+ Details

Name:	cah_RestructuringPaymentsandOtherAdjustments
Namespace Prefix:	cah_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

+ Details

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_FacilityClosingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=cah_TotalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: