Cash Component For Settlement Framework, Term

No definition available.

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

- Definition

Income from Settlements of Class Action Lawsuits

+ References

No definition available.

+ Details

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

- Definition

Loss Contingency, Lawsuits, Number

+ References

No definition available.

+ Details

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

- 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

Number of State Attorneys General filing lawsuits

+ References

No definition available.

+ Details

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

- Definition

Opioid Total Settlement, Cuyahoga and Summit Counties

+ References

No definition available.

+ Details

Name:	cah_OpioidTotalSettlementCuyahogaandSummitCounties
Namespace Prefix:	cah_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Name:	us-gaap_CostOfGoodsAndServicesSold
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

+ Details

Name:	us-gaap_GainLossRelatedToLitigationSettlement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Reflects the amount charged against earnings comprised of the costs to announce and effect a recall of defective merchandise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Name:	us-gaap_InventoryRecallExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- 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

Amount of loss contingency liability.

+ References

+ Details

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

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12021-110248

+ Details

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

+ 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

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Name:	us-gaap_SellingGeneralAndAdministrativeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	srt_LitigationCaseAxis=cah_OpioidLawsuitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	srt_LitigationCaseAxis=cah_OpioidLawsuitsStateDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=cah_ProductLiabilityLawsuitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=cah_OpioidLitigationlessCuyahogaandSummitCountiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=cah_OpioidLitigationCuyahogaandSummitCountiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=cah_CVSHealthMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=cah_AlamedaCountyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=cah_OtherJurisdictionsMember
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:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	cah_GownRecallAxis=cah_SterileSurgicalGownRecallMemberDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	cah_OpioidLitigationAxis=cah_TotalOpioidLitigationnetoftaxMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	cah_OpioidLitigationAxis=cah_TotalOpioidLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	cah_PlaintiffTypeAxis=cah_PrivatePartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	cah_LawsuitTypeAxis=cah_ClassActionLawsuitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments, Contingent Liabilities and Litigation (Details) $ in Millions		3 Months Ended								12 Months Ended
	Jul. 28, 2020 plaintiff lawsuit	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Aug. 11, 2020 StateAG lawsuit
Loss Contingencies [Line Items]
Income from Settlements of Class Action Lawsuits										$ 16.0	$ 94.0	$ 22.0
Cost of Goods and Services Sold										146,054.0	138,700.0	129,628.0
Distribution, selling, general and administrative expenses		$ 1,137.0	$ 1,165.0	$ 1,163.0	$ 1,107.0	$ 1,168.0	$ 1,097.0	$ 1,064.0	$ 1,155.0	4,572.0	4,480.0	4,596.0
Opioid Total Settlement, Cuyahoga and Summit Counties		215.0								215.0
Gain (Loss) Related to Litigation Settlement										$ (5,741.0)	$ (36.0)	$ (159.0)
Opioid Lawsuits \| Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Lawsuits, Number													3,000
Number of State Attorneys General filing lawsuits \| StateAG													25
Opioid Lawsuits State [Domain] \| Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Lawsuits, Number													2,800
Product Liability Lawsuits \| Subsequent Event
Loss Contingencies [Line Items]
Number of lawsuits filed \| lawsuit	31
Opioid Litigation, less Cuyahoga and Summit Counties [Member]
Loss Contingencies [Line Items]
Estimated Litigation Liability					5,560.0
Cash Component For Settlement Framework, Term										18 years
Opioid Litigation, Cuyahoga and Summit Counties [Member]
Loss Contingencies [Line Items]
Gain (Loss) Related to Litigation Settlement										$ (66.0)
CVS Health
Loss Contingencies [Line Items]
Maximum quarterly payment										45.6
Alameda County [Member] \| Product Liability Lawsuits \| Subsequent Event
Loss Contingencies [Line Items]
Number of plaintiffs \| plaintiff	4,280
Other Jurisdictions [Member] \| Product Liability Lawsuits \| Subsequent Event
Loss Contingencies [Line Items]
Number of plaintiffs \| plaintiff	36
Product Liability Lawsuits \| Subsequent Event
Loss Contingencies [Line Items]
Number of lawsuits filed \| lawsuit	334
Minimum
Loss Contingencies [Line Items]
Loss Contingency Accrual		468.0								468.0
Maximum
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss		$ 919.0								919.0
Sterile Surgical Gown Recall [Member] [Domain]
Loss Contingencies [Line Items]
Inventory Recall Expense										85.0
Cost of Goods and Services Sold										48.0
Distribution, selling, general and administrative expenses										$ 37.0
Total Opioid Litigation, net of tax [Member]
Loss Contingencies [Line Items]
Gain (Loss) Related to Litigation Settlement					(5,140.0)
Total Opioid Litigation [Member]
Loss Contingencies [Line Items]
Estimated Litigation Liability			$ 5,630.0
Gain (Loss) Related to Litigation Settlement					$ (5,630.0)
Private Parties [Member] \| Opioid Lawsuits \| Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Lawsuits, Number \| lawsuit													400
Class Action Lawsuits [Member] \| Private Parties [Member] \| Opioid Lawsuits \| Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Lawsuits, Number \| lawsuit													106