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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, 2022
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]      
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ (932) $ 612 $ (3,693)
Net earnings attributable to noncontrolling interest (1) (1) (3)
Net Income (Loss) Attributable to Parent $ (933) $ 611 $ (3,696)
Weighted-average common shares–basic (in shares) 279 292 293
Effect of dilutive securities:      
Employee stock options, restricted share units, and performance share units (in shares) 0 2 0
Weighted-average common shares–diluted (in shares) 279 294 293
Diluted earnings per common share attributable to Cardinal Health, Inc.:      
Earnings Per Share, Basic $ (3.35) $ 2.09 $ (12.61)
Earnings Per Share, Diluted $ (3.35) $ 2.08 $ (12.61)