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Earnings (Loss) Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Schedule of earnings (loss) per common share, basic and diluted | Earnings (loss) per common share were computed as follows (dollars and shares in millions, except per share amounts):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Earnings (loss) per common share |  |  |  |  |
Net income (loss) attributable to Valero stockholders | $ | (1,421) |  |  | $ | 2,422 |  |  | $ | 3,122 |
Less: Income allocated to participating securities | 5 |  |  | 7 |  |  | 9 |
Net income (loss) available to common shareholders | $ | (1,426) |  |  | $ | 2,415 |  |  | $ | 3,113 |
Weighted-average common shares outstanding | 407 |  |  | 413 |  |  | 426 |
Earnings (loss) per common share | $ | (3.50) |  |  | $ | 5.84 |  |  | $ | 7.30 |
Earnings (loss) per common share – assuming dilution |  |  |  |  |
Net income (loss) attributable to Valero stockholders | $ | (1,421) |  |  | $ | 2,422 |  |  | $ | 3,122 |
Less: Income allocated to participating securities | 5 |  |  | 7 |  |  | 9 |
Net income (loss) available to common shareholders | $ | (1,426) |  |  | $ | 2,415 |  |  | $ | 3,113 |
Weighted-average common shares outstanding | 407 |  |  | 413 |  |  | 426 |
Effect of dilutive securities | — |  |  | 1 |  |  | 2 |
Weighted-average common shares outstanding – assuming dilution | 407 |  |  | 414 |  |  | 428 |
Earnings (loss) per common share – assuming dilution | $ | (3.50) |  |  | $ | 5.84 |  |  | $ | 7.29 |

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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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