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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
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]    
Weighted-average common shares–basic (in shares) 293 296
Effect of dilutive securities:    
Weighted Average Number Diluted Shares Outstanding Adjustment 0 0
Weighted-average common shares–diluted (in shares) 293 296