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Earnings Per Common Share (Tables) | 3 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Schedule of computations for basic and diluted earnings per common share | The computations for basic and diluted earnings or loss per common share are as follows:
| Quarter Ended June 30,
(In millions, except per share amounts) | 2018 |  | 2017
Income (loss) from continuing operations | $ | (81 | ) |  | $ | 363 |
Net income attributable to noncontrolling interests | (58 | ) |  | (56 | )
Income (loss) from continuing operations attributable to McKesson | (139 | ) |  | 307 |
Income from discontinued operations, net of tax | 1 |  |  | 2 |
Net income (loss) attributable to McKesson | $ | (138 | ) |  | $ | 309 |
Weighted average common shares outstanding: |  |  |
Basic | 202 |  |  | 211 |
Effect of dilutive securities: |  |  |
Options to purchase common stock | — |  |  | 1 |
Restricted stock units | — |  |  | 1 |
Diluted | 202 |  |  | 213 |
Earnings (loss) per common share attributable to McKesson: (1) |  |  |
Diluted |  |  |
Continuing operations | $ | (0.69 | ) |  | $ | 1.44 |
Discontinued operations | 0.01 |  |  | 0.01 |
Total | $ | (0.68 | ) |  | $ | 1.45 |
Basic |  |  |
Continuing operations | $ | (0.69 | ) |  | $ | 1.46 |
Discontinued operations | 0.01 |  |  | — |
Total | $ | (0.68 | ) |  | $ | 1.46 |
(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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