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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
 3 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]                      
Earnings from continuing operations $ 335 $ 386 $ 326 $ 384 $ 293 $ 365 $ 289 $ 266 $ 1,431 $ 1,212 $ 1,163
Net earnings attributable to noncontrolling interest (2) 0 0 (1) 0 0 0 0 (4) 0 0
Net earnings from continuing operations attributable to Cardinal Health, Inc.                 1,427 1,212 1,163
Earnings from discontinued operations, net of tax 0 0 0 0 2 0 0 0 0 3 3
Net earnings attributable to Cardinal Health, Inc. $ 333 $ 386 $ 326 $ 383 $ 295 $ 365 $ 289 $ 266 $ 1,427 $ 1,215 $ 1,166
Weighted-average common shares–basic (in shares)                 327 332 341
Effect of dilutive securities:                      
Employee stock options, restricted share units, and performance share units (in shares)                 3 3 4
Weighted-average common shares–diluted (in shares)                 330 335 345
Basic earnings per common share attributable to Cardinal Health, Inc.:                      
Continuing operations (in usd per share) $ 1.03 $ 1.18 $ 0.99 $ 1.17 $ 0.89 $ 1.10 $ 0.87 $ 0.79 $ 4.36 $ 3.65 $ 3.41
Discontinued operations (in usd per share)                 0.00 0.01 0.01
Net basic earnings per common share attributable to Cardinal Health, Inc. (in usd per share)                 4.36 3.66 3.42
Diluted earnings per common share attributable to Cardinal Health, Inc.:                      
Continuing operations (in usd per share) $ 1.02 $ 1.17 $ 0.98 $ 1.15 $ 0.88 $ 1.09 $ 0.86 $ 0.78 4.32 3.61 3.37
Discontinued operations (in usd per share)                 0.00 0.01 0.01
Net diluted earnings per common share attributable to Cardinal Health, Inc. (in usd per share)                 $ 4.32 $ 3.62 $ 3.38