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Earnings Per Common Share (Tables) | 12 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Schedule of basic and diluted earnings per common share | The computations for basic and diluted earnings per common share are as follows:
| Years Ended March 31,
(In millions, except per share amounts) | 2018 |  | 2017 |  | 2016
Income from continuing operations | $ | 292 |  |  | $ | 5,277 |  |  | $ | 2,342 |
Net income attributable to noncontrolling interests | (230 | ) |  | (83 | ) |  | (52 | )
Income from continuing operations attributable to McKesson | 62 |  |  | 5,194 |  |  | 2,290 |
Income (Loss) from discontinued operations, net of tax | 5 |  |  | (124 | ) |  | (32 | )
Net income attributable to McKesson | $ | 67 |  |  | $ | 5,070 |  |  | $ | 2,258 |
Weighted average common shares outstanding: |  |  |  |  |
Basic | 208 |  |  | 221 |  |  | 230 |
Effect of dilutive securities: |  |  |  |  |
Options to purchase common stock | — |  |  | 1 |  |  | 1 |
Restricted stock units | 1 |  |  | 1 |  |  | 2 |
Diluted | 209 |  |  | 223 |  |  | 233 |
Earnings (loss) per common share attributable to McKesson: (1) |  |  |  |  |
Diluted |  |  |  |  |
Continuing operations | $ | 0.30 |  |  | $ | 23.28 |  |  | $ | 9.84 |
Discontinued operations | 0.02 |  |  | (0.55 | ) |  | (0.14 | )
Total | $ | 0.32 |  |  | $ | 22.73 |  |  | $ | 9.70 |
Basic |  |  |  |  |
Continuing operations | $ | 0.30 |  |  | $ | 23.50 |  |  | $ | 9.96 |
Discontinued operations | 0.02 |  |  | (0.55 | ) |  | (0.14 | )
Total | $ | 0.32 |  |  | $ | 22.95 |  |  | $ | 9.82 |
(1) | Certain computations may reflect rounding adjustments.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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