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, 2025	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 1,569	$ 853	$ 331
Net earnings attributable to noncontrolling interest	(8)	(1)	(1)
Net Income (Loss)	$ 1,561	$ 852	$ 330
Weighted-average common shares–basic (in shares)	241	245	261
Effect of dilutive securities:
Employee stock options, restricted share units, and performance share units (in shares)	1	2	1
Weighted-average common shares–diluted (in shares)	242	247	262
Diluted earnings per common share attributable to Cardinal Health, Inc.:
Basic (in dollars per share)	$ 6.48	$ 3.48	$ 1.27
Diluted (in dollars per share)	$ 6.45	$ 3.45	$ 1.26