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Earnings (Loss) Per Common Share (Tables) | 9 Months Ended
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Dec. 31, 2020
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:
| Three Months Ended December 31, |  | Nine Months Ended December 31,
(In millions, except per share amounts) | 2020 |  | 2019 |  | 2020 |  | 2019
Income (loss) from continuing operations | $ | (6,174) |  |  | $ | 247 |  |  | $ | (5,052) |  |  | $ | 54 |
Net income attributable to noncontrolling interests | (52) |  |  | (56) |  |  | (152) |  |  | (163) |
Income (loss) from continuing operations attributable to McKesson Corporation | (6,226) |  |  | 191 |  |  | (5,204) |  |  | (109) |
Loss from discontinued operations, net of tax | — |  |  | (5) |  |  | (1) |  |  | (12) |
Net income (loss) attributable to McKesson Corporation | $ | (6,226) |  |  | $ | 186 |  |  | $ | (5,205) |  |  | $ | (121) |
Weighted-average common shares outstanding: |  |  |  |  |  |  |
Basic | 159.5 |  |  | 178.7 |  |  | 161.2 |  |  | 183.1 |
Effect of dilutive securities: |  |  |  |  |  |  |
Restricted stock units | — |  |  | 1.0 |  |  | — |  |  | — |
Diluted | 159.5 |  |  | 179.7 |  |  | 161.2 |  |  | 183.1 |
Earnings (loss) per common share attributable to McKesson: (1) |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |
Continuing operations | $ | (39.03) |  |  | $ | 1.06 |  |  | $ | (32.28) |  |  | $ | (0.60) |
Discontinued operations | — |  |  | (0.03) |  |  | (0.01) |  |  | (0.06) |
Total | $ | (39.03) |  |  | $ | 1.03 |  |  | $ | (32.29) |  |  | $ | (0.66) |
Basic |  |  |  |  |  |  |
Continuing operations | $ | (39.03) |  |  | $ | 1.06 |  |  | $ | (32.28) |  |  | $ | (0.60) |
Discontinued operations | — |  |  | (0.02) |  |  | (0.01) |  |  | (0.06) |
Total | $ | (39.03) |  |  | $ | 1.04 |  |  | $ | (32.29) |  |  | $ | (0.66) |
(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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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