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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 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]        
Weighted-average common shares–basic (in shares) 315 318 315 319
Effect of dilutive securities:        
Employee stock options, restricted share units, and performance share units (in shares) 1 1 2 2
Weighted-average common shares–diluted (in shares) 316 319 317 321