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Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
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):
| Three Months Ended March 31,
| 2018 |  | 2017
| Participating Securities |  | Common Stock |  | Participating Securities |  | Common Stock
Earnings per common share: |  |  |  |  |  |  |
Net income attributable to Valero stockholders |  |  | $ | 469 |  |  |  |  | $ | 305 |
Less dividends paid: |  |  |  |  |  |  |
Common stock |  |  | 344 |  |  |  |  | 314 |
Participating securities |  |  | 1 |  |  |  |  | 1 |
Undistributed earnings (excess distributions over earnings) |  |  | $ | 124 |  |  |  |  | $ | (10 | )
Weighted-average common shares outstanding | 1 |  |  | 431 |  |  | 2 |  |  | 448 |
Earnings per common share: |  |  |  |  |  |  |
Distributed earnings | $ | 0.80 |  |  | $ | 0.80 |  |  | $ | 0.70 |  |  | $ | 0.70 |
Undistributed earnings (excess distributions over earnings) | 0.29 |  |  | 0.29 |  |  | — |  |  | (0.02 | )
Total earnings per common share | $ | 1.09 |  |  | $ | 1.09 |  |  | $ | 0.70 |  |  | $ | 0.68 |
Earnings per common share – assuming dilution: |  |  |  |  |  |  |
Net income attributable to Valero stockholders |  |  | $ | 469 |  |  |  |  | $ | 305 |
Weighted-average common shares outstanding |  |  | 431 |  |  |  |  | 448 |
Common equivalent shares |  |  | 1 |  |  |  |  | 3 |
Weighted-average common shares outstanding – assuming dilution |  |  | 432 |  |  |  |  | 451 |
Earnings per common share – assuming dilution |  |  | $ | 1.09 |  |  |  |  | $ | 0.68 |

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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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