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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information | The following table summarizes quarterly financial data for the years ended December 31, 2012 and 2011 (in millions, except per share amounts).
| 2012 Quarter Ended
| March 31 (a) |  | June 30 |  | September 30 |  | December 31
Operating revenues | $ | 35,167 |  |  | $ | 34,662 |  |  | $ | 34,726 |  |  | $ | 34,695 |
Operating income (loss) | (244 | ) |  | 1,361 |  |  | 1,309 |  |  | 1,584 |
Income (loss) from continuing operations | (432 | ) |  | 830 |  |  | 673 |  |  | 1,009 |
Net income (loss) | (432 | ) |  | 830 |  |  | 673 |  |  | 1,009 |
Net income (loss) attributable to Valero Energy Corporation stockholders | (432 | ) |  | 831 |  |  | 674 |  |  | 1,010 |
Earnings (loss) per common share from continuing operations – assuming dilution | (0.78 | ) |  | 1.50 |  |  | 1.21 |  |  | 1.82 |
Earnings (loss) per common share – assuming dilution | (0.78 | ) |  | 1.50 |  |  | 1.21 |  |  | 1.82 |
| 2011 Quarter Ended
| March 31 |  | June 30 |  | September 30 (b) |  | December 31 (c)
Operating revenues | $ | 26,308 |  |  | $ | 31,293 |  |  | $ | 33,713 |  |  | $ | 34,673 |
Operating income | 244 |  |  | 1,290 |  |  | 1,979 |  |  | 167 |
Income from continuing operations | 104 |  |  | 744 |  |  | 1,203 |  |  | 45 |
Net income | 98 |  |  | 743 |  |  | 1,203 |  |  | 45 |
Net income attributable to Valero Energy Corporation stockholders | 98 |  |  | 744 |  |  | 1,203 |  |  | 45 |
Earnings per common share from continuing operations – assuming dilution | 0.18 |  |  | 1.30 |  |  | 2.11 |  |  | 0.08 |
Earnings per common share – assuming dilution | 0.17 |  |  | 1.30 |  |  | 2.11 |  |  | 0.08 |
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(a) | The operations of the Aruba Refinery were suspended in March 2012.
(b) | Includes the operations related to the Pembroke Acquisition beginning August 1, 2011.
(c) | Includes the operations related to the Meraux Acquisition beginning October 1, 2011.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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