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Earnings Per Common Share (Tables) | 12 Months Ended
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Mar. 31, 2020
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) | 2020 |  | 2019 |  | 2018
Income from continuing operations | $ | 1,126 |  |  | $ | 254 |  |  | $ | 292 |
Net income attributable to noncontrolling interests | (220 | ) |  | (221 | ) |  | (230 | )
Income from continuing operations attributable to McKesson | 906 |  |  | 33 |  |  | 62 |
Income (loss) from discontinued operations, net of tax | (6 | ) |  | 1 |  |  | 5 |
Net income attributable to McKesson | $ | 900 |  |  | $ | 34 |  |  | $ | 67 |
Weighted average common shares outstanding: |  |  |  |  |
Basic | 181 |  |  | 196 |  |  | 208 |
Effect of dilutive securities: |  |  |  |  |
Restricted stock units | 1 |  |  | 1 |  |  | 1 |
Diluted | 182 |  |  | 197 |  |  | 209 |
Earnings (loss) per common share attributable to McKesson: (1) |  |  |  |  |
Diluted |  |  |  |  |
Continuing operations | $ | 4.99 |  |  | $ | 0.17 |  |  | $ | 0.30 |
Discontinued operations | (0.04 | ) |  | — |  |  | 0.02 |
Total | $ | 4.95 |  |  | $ | 0.17 |  |  | $ | 0.32 |
Basic |  |  |  |  |
Continuing operations | $ | 5.01 |  |  | $ | 0.17 |  |  | $ | 0.30 |
Discontinued operations | (0.03 | ) |  | — |  |  | 0.02 |
Total | $ | 4.98 |  |  | $ | 0.17 |  |  | $ | 0.32 |
(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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