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Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Operating revenues (a) | [1] | $ 19,649 | $ 22,579 | $ 54,947 | $ 69,027
Costs and expenses: |  |  |  |  |
Cost of sales (excluding the lower of cost or market inventory valuation adjustment) |  | 17,033 | 18,677 | 47,660 | 58,234
Lower of cost or market inventory valuation adjustment |  | 0 | 0 | (747) | 0
Operating expenses |  | 1,062 | 1,102 | 3,093 | 3,229
General and administrative expenses |  | 192 | 179 | 507 | 504
Depreciation and amortization expense |  | 470 | 482 | 1,426 | 1,348
Asset impairment loss |  | 0 | 0 | 56 | 0
Total costs and expenses |  | 18,757 | 20,440 | 51,995 | 63,315
Operating income |  | 892 | 2,139 | 2,952 | 5,712
Other income, net |  | 12 | 3 | 35 | 35
Interest and debt expense, net of capitalized interest |  | (115) | (112) | (334) | (326)
Income before income tax expense |  | 789 | 2,030 | 2,653 | 5,421
Income tax expense |  | 144 | 657 | 652 | 1,715
Net income |  | 645 | 1,373 | 2,001 | 3,706
Less: Net income (loss) attributable to noncontrolling interests |  | 32 | (4) | 79 | 14
Net income attributable to Valero Energy Corporation stockholders |  | $ 613 | $ 1,377 | $ 1,922 | $ 3,692
Earnings per common share |  | $ 1.33 | $ 2.79 | $ 4.12 | $ 7.31
Weighted-average common shares outstanding (in millions) |  | 458 | 491 | 465 | 503
Earnings per common share – assuming dilution |  | $ 1.33 | $ 2.79 | $ 4.12 | $ 7.30
Weighted-average common shares outstanding – assuming dilution (in millions) |  | 460 | 494 | 467 | 506
Dividends per common share |  | $ 0.60 | $ 0.40 | $ 1.80 | $ 1.20
[1] | Includes excise taxes on sales by certain of our international operations of $1,398 million and $1,538 million for the three months ended September 30, 2016 and 2015, respectively, and $4,263 million and $4,477 million for the nine months ended September 30, 2016 and 2015, respectively.

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