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Restructuring and Employee Severance (Liabilities Associated with Restructuring and Employee Severance Activities) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Dec. 31, 2014
Employee-Related Costs
Restructuring Reserve
Beginning Balance	$ 24us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Additions to restructuring reserve	18cah_Additionstorestructuringreserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Payments and other adjustments	(18)cah_RestructuringPaymentsandOtherAdjustments / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Ending Balance	24us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Facility Exit and Other Costs
Restructuring Reserve
Beginning Balance	0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Additions to restructuring reserve	1cah_Additionstorestructuringreserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Payments and other adjustments	0cah_RestructuringPaymentsandOtherAdjustments / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Ending Balance	1us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Total
Restructuring Reserve
Beginning Balance	24us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = cah_TotalMember
Additions to restructuring reserve	19cah_Additionstorestructuringreserve / us-gaap_RestructuringCostAndReserveAxis = cah_TotalMember
Payments and other adjustments	(18)cah_RestructuringPaymentsandOtherAdjustments / us-gaap_RestructuringCostAndReserveAxis = cah_TotalMember
Ending Balance	$ 25us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = cah_TotalMember

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- 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

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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