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Consolidated Statements of Income (unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Operating revenues (a) | [1] | $ 22,254 | $ 19,584 | $ 44,026 | $ 35,298
Costs and expenses: |  |  |  |  |
Cost of sales (excluding the lower of cost or market inventory valuation adjustment) |  | 19,609 | 17,120 | 39,037 | 30,627
Lower of cost or market inventory valuation adjustment |  | 0 | (454) | 0 | (747)
Operating expenses |  | 1,097 | 1,001 | 2,214 | 2,031
General and administrative expenses |  | 178 | 159 | 368 | 315
Depreciation and amortization expense |  | 499 | 471 | 999 | 956
Asset impairment loss |  | 0 | 56 | 0 | 56
Total costs and expenses |  | 21,383 | 18,353 | 42,618 | 33,238
Operating income |  | 871 | 1,231 | 1,408 | 2,060
Other income, net |  | 16 | 14 | 33 | 23
Interest and debt expense, net of capitalized interest |  | (119) | (111) | (240) | (219)
Income before income tax expense |  | 768 | 1,134 | 1,201 | 1,864
Income tax expense |  | 196 | 291 | 308 | 508
Net income |  | 572 | 843 | 893 | 1,356
Less: Net income attributable to noncontrolling interests |  | 24 | 29 | 40 | 47
Net income attributable to Valero Energy Corporation stockholders |  | $ 548 | $ 814 | $ 853 | $ 1,309
Earnings per common share |  | $ 1.23 | $ 1.74 | $ 1.90 | $ 2.79
Weighted-average common shares outstanding (in millions) |  | 444 | 467 | 446 | 468
Earnings per common share – assuming dilution |  | $ 1.23 | $ 1.73 | $ 1.90 | $ 2.78
Weighted-average common shares outstanding – assuming dilution (in millions) |  | 446 | 470 | 448 | 471
Dividends per common share |  | $ 0.70 | $ 0.60 | $ 1.40 | $ 1.20
[1] | Includes excise taxes on sales by certain of our international operations of $1,384 million and $1,470 million for the three months ended June 30, 2017 and 2016, respectively, and $2,656 million and $2,865 million for the six months ended June 30, 2017 and 2016, respectively.

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