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Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2013
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,
| 2013 |  | 2012
| Restricted Stock |  | Common Stock |  | Restricted Stock |  | Common Stock
Earnings per common share: |  |  |  |  |  |  |
Net income (loss) attributable to Valero stockholders |  |  | $ | 654 |  |  |  |  | $ | (432 | )
Less dividends paid: |  |  |  |  |  |  |
Common stock |  |  | 110 |  |  |  |  | 83 |
Nonvested restricted stock |  |  | 1 |  |  |  |  | — |
Undistributed earnings (loss) |  |  | $ | 543 |  |  |  |  | $ | (515 | )
Weighted-average common shares outstanding | 3 |  |  | 550 |  |  | 3 |  |  | 551 |
Earnings per common share: |  |  |  |  |  |  |
Distributed earnings | $ | 0.20 |  |  | $ | 0.20 |  |  | $ | 0.15 |  |  | $ | 0.15 |
Undistributed earnings (loss) | 0.98 |  |  | 0.98 |  |  | — |  |  | (0.93 | )
Total earnings per common share | $ | 1.18 |  |  | $ | 1.18 |  |  | $ | 0.15 |  |  | $ | (0.78 | )
Earnings per common share – assuming dilution: |  |  |  |  |  |  |
Net income (loss) attributable to Valero stockholders |  |  | $ | 654 |  |  |  |  | $ | (432 | )
Weighted-average common shares outstanding |  |  | 550 |  |  |  |  | 551 |
Common equivalent shares: |  |  |  |  |  |  |
Stock options |  |  | 4 |  |  |  |  | — |
Performance awards and nonvested restricted stock |  |  | 2 |  |  |  |  | — |
Weighted-average common shares outstanding – assuming dilution |  |  | 556 |  |  |  |  | 551 |
Earnings per common share – assuming dilution |  |  | $ | 1.18 |  |  |  |  | $ | (0.78 | )
Potentially dilutive securities excluded from calculation of earnings per common share - assuming dilution | The following table reflects potentially dilutive securities (in millions) that were excluded from the calculation of “earnings per common share – assuming dilution” as the effect of including such securities would have been antidilutive.
| Three Months Ended March 31,
| 2013 |  | 2012
Common equivalent shares (a) | — |  |  | 6 |
Stock options (b) | 3 |  |  | 6 |
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(a) | Common equivalent shares (primarily stock options) were excluded from weighted-average common shares outstanding – assuming dilution due to the net loss for the three months ended March 31, 2012.
(b) | Stock options were excluded from weighted-average common shares outstanding – assuming dilution because the exercise price of the stock option was greater than the average market price of our common shares during each reporting period.

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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