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Earnings Per Share Attributable to Cardinal Health, Inc. Narrative (Details) - shares shares in Millions | 3 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Earnings Per Share [Abstract] |  |
Weighted Average Number Diluted Shares Outstanding Adjustment | 6 |
shares that would be antidilutive as a result of net loss | 1 |
Potentially dilutive employee stock options, restricted share units and performance share units that were antidilutive (in shares) |  | 6

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- Definition Number of shares excluded from calculation of diluted shares + References No definition available. + Details
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Namespace Prefix: | cah_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition shares that would be antidilutive as a result of net loss + References No definition available. + Details
Name: | cah_Sharesthatwouldbeantidilutiveasaresultofnetloss
Namespace Prefix: | cah_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Period Type: | duration