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Earnings Per Share Attributable to Cardinal Health, Inc. (Tables) | 6 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | 14. Earnings Per Share Attributable to Cardinal Health, Inc. The following table reconciles the number of common shares used to compute basic and diluted earnings per share attributable to Cardinal Health, Inc.:
| Three Months Ended December 31,
(in millions) | 2017 |  | 2016
Weighted-average common shares–basic | 315 |  |  | 318 |
Effect of dilutive securities: |  |  |
Employee stock options, restricted share units and performance share units | 1 |  |  | 1 |
Weighted-average common shares–diluted | 316 |  |  | 319 |
| Six Months Ended December 31,
(in millions) | 2017 |  | 2016
Weighted-average common shares–basic | 315 |  |  | 319 |
Effect of dilutive securities: |  |  |
Employee stock options, restricted share units and performance share units | 2 |  |  | 2 |
Weighted-average common shares–diluted | 317 |  |  | 321 |
The potentially dilutive employee stock options, restricted share units and performance share units that were antidilutive were 7 million and 4 million for the three months ended December 31, 2017 and 2016, respectively, and 6 million and 3 million for the six months ended December 31, 2017 and 2016, respectively.
Reconciliation of Common Shares Used to Compute Basic and Diluted Earnings Per Share | The following table reconciles the number of common shares used to compute basic and diluted earnings per share attributable to Cardinal Health, Inc.:
| Three Months Ended December 31,
(in millions) | 2017 |  | 2016
Weighted-average common shares–basic | 315 |  |  | 318 |
Effect of dilutive securities: |  |  |
Employee stock options, restricted share units and performance share units | 1 |  |  | 1 |
Weighted-average common shares–diluted | 316 |  |  | 319 |
| Six Months Ended December 31,
(in millions) | 2017 |  | 2016
Weighted-average common shares–basic | 315 |  |  | 319 |
Effect of dilutive securities: |  |  |
Employee stock options, restricted share units and performance share units | 2 |  |  | 2 |
Weighted-average common shares–diluted | 317 |  |  | 321 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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