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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

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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