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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ 26,392 | [1] | $ 23,562 | $ 22,254 | $ 21,772 | $ 20,712 | $ 19,649 | [2] | $ 19,584 | [3] | $ 15,714 | [4] | $ 93,980 | [5] | $ 75,659 | [5] | $ 87,804 | [5]
Gross profit | [6] | 1,121 | [1] | 1,624 | 1,063 | 739 | 841 | 1,096 | [2] | 1,457 | [3] | 997 | [4] |  |  |  |  |  |
Operating income |  | 853 | [1] | 1,338 | 871 | 537 | 620 | 892 | [2] | 1,231 | [3] | 829 | [4] | 3,599 |  | 3,572 |  | 6,358 |
Net income |  | 2,400 | [1] | 863 | 572 | 321 | 416 | 645 | [2] | 843 | [3] | 513 | [4] | 4,156 |  | 2,417 |  | 4,101 |
Net income attributable to Valero Energy Corporation stockholders |  | $ 2,371 | [1] | $ 841 | $ 548 | $ 305 | $ 367 | $ 613 | [2] | $ 814 | [3] | $ 495 | [4] | $ 4,065 |  | $ 2,289 |  | $ 3,990 |
Earnings per common share (in usd per share) |  | $ 5.43 | [1] | $ 1.91 | $ 1.23 | $ 0.68 | $ 0.81 | $ 1.33 | [2] | $ 1.74 | [3] | $ 1.05 | [4] | $ 9.17 |  | $ 4.94 |  | $ 8.00 |
Earnings per common share - assuming dilution (in usd per share) |  | $ 5.42 | [1] | $ 1.91 | $ 1.23 | $ 0.68 | $ 0.81 | $ 1.33 | [2] | $ 1.73 | [3] | $ 1.05 | [4] | $ 9.16 |  | $ 4.94 |  | $ 7.99 |
Quarterly Financial Data (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit related to Tax Reform |  | $ 1,900 |  |  |  |  |  |  |  |  |  |  |  | $ 1,862 |  | $ 7 |  | $ 17 |
Lower of cost or market inventory valuation adjustment |  |  |  |  |  |  |  |  |  | $ (454) |  | $ (293) |  | 0 |  | (747) |  | 790 |
Asset impairment loss |  |  |  |  |  |  |  |  |  | $ 56 |  |  |  | 0 |  | 56 |  | 0 |
Tax benefit on disposition |  |  |  |  |  |  |  | $ 42 |  |  |  |  |  | $ 949 |  | $ (765) |  | $ (1,870) |
[1] | During the quarter ended December 31, 2017, we recognized an income tax benefit of $1.9 billion related to Tax Reform as described in Note 14.
[2] | During the quarter ended September 30, 2016, we recognized a tax benefit of $42 million related to the Aruba Disposition as described in Note 2.
[3] | During the quarter ended June 30, 2016, we recognized a favorable noncash lower of cost or market inventory valuation adjustment of $454 million as described in Note 4 and an asset impairment loss of $56 million related to the Aruba Disposition as described in Note 2.
[4] | During the quarter ended March 31, 2016, we recognized a favorable noncash lower of cost or market inventory valuation adjustment of $293 million as described in Note 4.
[5] | Includes excise taxes on sales by certain of our international operations of $5,573 million, $5,493 million, and $5,980 million for the years ended December 31, 2017, 2016, and 2015.
[6] | Gross profit is calculated as operating revenues less total cost of sales.

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