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Earnings Per Share Attributable to Cardinal Health, Inc. Narrative (Details) - shares shares in Millions | 3 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Earnings Per Share [Abstract] |  |
Weighted Average Number Diluted Shares Outstanding Adjustment | 7 | 6
shares that would be antidilutive as a result of net loss | 2 | 1

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

X
- 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

X
- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration