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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information | The following table summarizes quarterly financial data for the years ended December 31, 2015 and 2014 (in millions, except per share amounts).
| 2015 Quarter Ended
| March 31 |  | June 30 |  | September 30 |  | December 31 (a)
Operating revenues | $ | 21,330 |  |  | $ | 25,118 |  |  | $ | 22,579 |  |  | $ | 18,777 |
Operating income | 1,495 |  |  | 2,078 |  |  | 2,139 |  |  | 646 |
Net income | 968 |  |  | 1,365 |  |  | 1,373 |  |  | 395 |
Net income attributable to Valero Energy Corporation stockholders | 964 |  |  | 1,351 |  |  | 1,377 |  |  | 298 |
Earnings per common share | 1.87 |  |  | 2.67 |  |  | 2.79 |  |  | 0.62 |
Earnings per common share – assuming dilution | 1.87 |  |  | 2.66 |  |  | 2.79 |  |  | 0.62 |
| 2014 Quarter Ended
| March 31 |  | June 30 |  | September 30 |  | December 31
Operating revenues | 33,663 |  |  | 34,914 |  |  | 34,408 |  |  | 27,859 |
Operating income | 1,351 |  |  | 1,085 |  |  | 1,670 |  |  | 1,796 |
Net income | 836 |  |  | 593 |  |  | 1,062 |  |  | 1,220 |
Net income attributable to Valero Energy Corporation stockholders | 828 |  |  | 588 |  |  | 1,059 |  |  | 1,155 |
Earnings per common share | 1.55 |  |  | 1.11 |  |  | 2.01 |  |  | 2.22 |
Earnings per common share – assuming dilution | 1.54 |  |  | 1.10 |  |  | 2.00 |  |  | 2.22 |
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(a) | Operating income for the quarter ended December 31, 2015 reflects a noncash lower of cost or market inventory valuation adjustment of $790 million, as described in Note 6.

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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=51825399&loc=d3e1280-108306 + Details
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