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Earnings Per Common Share (Tables) | 9 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule of computations for basic and diluted earnings per common share | The computations for basic and diluted earnings per common share are as follows:
| Quarter Ended December 31, |  | Nine Months Ended December 31,
(In millions, except per share amounts) | 2018 |  | 2017 |  | 2018 |  | 2017
Income from continuing operations | $ | 527 |  |  | $ | 960 |  |  | $ | 998 |  |  | $ | 1,379 |
Net income attributable to noncontrolling interests | (57 | ) |  | (58 | ) |  | (169 | ) |  | (169 | )
Income from continuing operations attributable to McKesson | 470 |  |  | 902 |  |  | 829 |  |  | 1,210 |
(Loss) Income from discontinued operations, net of tax | (1 | ) |  | 1 |  |  | 1 |  |  | 3 |
Net income attributable to McKesson | $ | 469 |  |  | $ | 903 |  |  | $ | 830 |  |  | $ | 1,213 |
Weighted average common shares outstanding: |  |  |  |  |  |  |
Basic | 194 |  |  | 207 |  |  | 198 |  |  | 209 |
Effect of dilutive securities: |  |  |  |  |  |  |
Restricted stock units | 1 |  |  | 1 |  |  | 1 |  |  | 1 |
Diluted | 195 |  |  | 208 |  |  | 199 |  |  | 210 |
Earnings per common share attributable to McKesson: (1) |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |
Continuing operations | $ | 2.41 |  |  | $ | 4.32 |  |  | $ | 4.17 |  |  | $ | 5.75 |
Discontinued operations | (0.01 | ) |  | 0.01 |  |  | 0.01 |  |  | 0.01 |
Total | $ | 2.40 |  |  | $ | 4.33 |  |  | $ | 4.18 |  |  | $ | 5.76 |
Basic |  |  |  |  |  |  |
Continuing operations | $ | 2.42 |  |  | $ | 4.34 |  |  | $ | 4.19 |  |  | $ | 5.78 |
Discontinued operations | (0.01 | ) |  | 0.01 |  |  | — |  |  | 0.02 |
Total | $ | 2.41 |  |  | $ | 4.35 |  |  | $ | 4.19 |  |  | $ | 5.80 |
(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://fasb.org/us-gaap/role/ref/legacyRef -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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