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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
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Dec. 31, 2014
Employee-Related Costs |
Restructuring Reserve |
Beginning Balance | $ 24 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Additions to restructuring reserve | 18 cah_Additionstorestructuringreserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Payments and other adjustments | (18)cah_RestructuringPaymentsandOtherAdjustments / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Ending Balance | 24 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Facility Exit and Other Costs |
Restructuring Reserve |
Beginning Balance | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Additions to restructuring reserve | 1 cah_Additionstorestructuringreserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Payments and other adjustments | 0 cah_RestructuringPaymentsandOtherAdjustments / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Ending Balance | 1 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
Total |
Restructuring Reserve |
Beginning Balance | 24 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = cah_TotalMember
Additions to restructuring reserve | 19 cah_Additionstorestructuringreserve / us-gaap_RestructuringCostAndReserveAxis = cah_TotalMember
Payments and other adjustments | (18)cah_RestructuringPaymentsandOtherAdjustments / us-gaap_RestructuringCostAndReserveAxis = cah_TotalMember
Ending Balance | $ 25 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = cah_TotalMember

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- 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

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- 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

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- 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

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- 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: |

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- 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: |