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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of earnings per common share, basic and diluted | Earnings per common share were computed as follows (dollars and shares in millions, except per share amounts):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| Participating Securities |  | Common Stock |  | Participating Securities |  | Common Stock |  | Participating Securities |  | Common Stock
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Valero stockholders |  |  | $ | 4,065 |  |  |  |  | $ | 2,289 |  |  |  |  | $ | 3,990 |
Less dividends paid: |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  | 1,238 |  |  |  |  | 1,108 |  |  |  |  | 845 |
Participating securities |  |  | 4 |  |  |  |  | 3 |  |  |  |  | 3 |
Undistributed earnings |  |  | $ | 2,823 |  |  |  |  | $ | 1,178 |  |  |  |  | $ | 3,142 |
Weighted-average common shares outstanding | 2 |  |  | 442 |  |  | 1 |  |  | 461 |  |  | 2 |  |  | 497 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Distributed earnings | $ | 2.80 |  |  | $ | 2.80 |  |  | $ | 2.40 |  |  | $ | 2.40 |  |  | $ | 1.70 |  |  | $ | 1.70 |
Undistributed earnings | 6.37 |  |  | 6.37 |  |  | 2.54 |  |  | 2.54 |  |  | 6.30 |  |  | 6.30 |
Total earnings per common share | $ | 9.17 |  |  | $ | 9.17 |  |  | $ | 4.94 |  |  | $ | 4.94 |  |  | $ | 8.00 |  |  | $ | 8.00 |
Earnings per common share – assuming dilution: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Valero stockholders |  |  | $ | 4,065 |  |  |  |  | $ | 2,289 |  |  |  |  | $ | 3,990 |
Weighted-average common shares outstanding |  |  | 442 |  |  |  |  | 461 |  |  |  |  | 497 |
Common equivalent shares |  |  | 2 |  |  |  |  | 3 |  |  |  |  | 3 |
Weighted-average common shares outstanding – assuming dilution |  |  | 444 |  |  |  |  | 464 |  |  |  |  | 500 |
Earnings per common share – assuming dilution |  |  | $ | 9.16 |  |  |  |  | $ | 4.94 |  |  |  |  | $ | 7.99 |

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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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