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Earnings Per Share Attributable to Cardinal Health, Inc. (Narrative) (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]        
Potentially dilutive employee stock options, restricted share units and performance share units that were antidilutive (in shares) 4 2 3 2