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Earnings Per Share Attributable to Cardinal Health, Inc. (Reconciliation of Common Shares Used to Compute Basic and Diluted EPS) (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Earnings Per Share [Abstract]        
Weighted-average common shares–basic (in shares) 256 275 263 281
Effect of dilutive securities:        
Employee stock options, restricted share units, and performance share units (in shares) 2 0 1 0
Weighted-average common shares–diluted (in shares) 258 275 264 281