Initial term of Pharmaceutical Sourcing Venture

No definition available.

Name:	cah_InitialtermofPharmaceuticalSourcingVenture
Namespace Prefix:	cah_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Loss Contingencies, Number of Jurisdictions in Lawsuits

+ References

No definition available.

+ Details

Name:	cah_LossContingenciesNumberofJurisdictionsinLawsuits
Namespace Prefix:	cah_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Loss Contingency Accrual, Net of Insurance Recoveries

+ References

No definition available.

+ Details

Name:	cah_LossContingencyAccrualNetofInsuranceRecoveries
Namespace Prefix:	cah_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Loss contingencies, number of lawsuits transfered for consolidated pre-trial proceedings

+ References

No definition available.

+ Details

Name:	cah_Losscontingenciesnumberoflawsuitstransferedforconsolidatedpretrialproceedings
Namespace Prefix:	cah_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum Quarterly Payment for pharmaceutical sourcing venture if certain milestones are achieved.

+ References

No definition available.

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

+ Details

Name:	us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of plaintiffs that have filed claims pertaining to a loss contingency.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Describes the type of information that the parties to the litigation have sought or provided, and when it was provided.

+ References

+ Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationCaseAxis=cah_ProductLiabilityLawsuitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=cah_CVSHealthMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=cah_OpioidLawsuitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=cah_ProductLiabilityLawsuitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments, Contingent Liabilities and Litigation (Details) $ in Millions					1 Months Ended	3 Months Ended
	Feb. 02, 2018 organization jurisdictions	Feb. 02, 2018 jurisdictions county	Feb. 02, 2018 jurisdictions plaintiff	Feb. 02, 2018 jurisdictions lawsuit	Jul. 31, 2014	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Loss contingency, request for information						39
Loss contingency accrual, net of insurance recoveries \| $						$ 184.0
Subsequent Event
Loss Contingencies [Line Items]
Number of plaintiffs \| plaintiff			1,362
Product Liability Lawsuits \| Subsequent Event
Loss Contingencies [Line Items]
Number of lawsuits filed				17
Number of plaintiffs \| organization	28
CVS Health
Loss Contingencies [Line Items]
Initial term of pharmaceutical sourcing venture					10 years
Maximum quarterly payment \| $						$ 45.6
Opioid Lawsuits \| Subsequent Event
Loss Contingencies [Line Items]
Number of lawsuits filed				343
Loss contingencies, number of jurisdictions in lawsuits \| jurisdictions	36	36	36	36
Number of plaintiffs		317		23
Loss contingencies, number of lawsuits transfered for consolidated pre-trial proceedings				298
Product Liability Lawsuits \| Subsequent Event
Loss Contingencies [Line Items]
Number of lawsuits filed				112