Earnings Per Share Attributable to Cardinal Health, Inc. (Reconciliation of Common Shares Used to Compute Basic and Diluted EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 262	$ (932)	$ 612
Net earnings attributable to noncontrolling interest	(1)	(1)	(1)
Net Income (Loss) Attributable to Parent	$ 261	$ (933)	$ 611
Weighted-average common shares–basic (in shares)	261	279	292
Effect of dilutive securities:
Employee stock options, restricted share units, and performance share units (in shares)	1	0	2
Weighted-average common shares–diluted (in shares)	262	279	294
Diluted earnings per common share attributable to Cardinal Health, Inc.:
Earnings Per Share, Basic	$ 1.00	$ (3.35)	$ 2.09
Earnings Per Share, Diluted	$ 1.00	$ (3.35)	$ 2.08