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Consolidated Statements of Income (unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenues | [1] | $ 30,849 | $ 23,562 | $ 88,303 | $ 67,588
Cost of sales: |  |  |  |  |
Cost of materials and other |  | 27,701 | 20,329 | 79,317 | 59,366
Operating expenses (excluding depreciation and amortization expense reflected below) |  | 1,193 | 1,135 | 3,439 | 3,370
Depreciation and amortization expense |  | 504 | 484 | 1,499 | 1,457
Total cost of sales |  | 29,398 | 21,948 | 84,255 | 64,193
Other operating expenses |  | 10 | 44 | 41 | 44
General and administrative expenses (excluding depreciation and amortization expense reflected below) |  | 209 | 225 | 695 | 592
Depreciation and amortization expense |  | 13 | 13 | 39 | 39
Operating income |  | 1,219 | 1,332 | 3,273 | 2,720
Other income, net |  | 42 | 23 | 88 | 76
Interest and debt expense, net of capitalized interest |  | (111) | (114) | (356) | (354)
Income before income tax expense |  | 1,150 | 1,241 | 3,005 | 2,442
Income tax expense |  | 276 | 378 | 674 | 686
Net income |  | 874 | 863 | 2,331 | 1,756
Less: Net income attributable to noncontrolling interests |  | 18 | 22 | 161 | 62
Net income attributable to Valero Energy Corporation stockholders |  | $ 856 | $ 841 | $ 2,170 | $ 1,694
Earnings per common share (in dollars per share) |  | $ 2.01 | $ 1.91 | $ 5.05 | $ 3.80
Weighted-average common shares outstanding (in shares) |  | 425 | 439 | 428 | 444
Earnings per common share – assuming dilution (in dollars per share) |  | $ 2.01 | $ 1.91 | $ 5.05 | $ 3.80
Weighted-average common shares outstanding – assuming dilution (in shares) |  | 427 | 441 | 430 | 446
[1] | Includes excise taxes on sales by certain of our international operations of $1,338 million and $1,447 million for the three months ended September 30, 2018 and 2017, respectively, and $4,272 million and $4,103 million for the nine months ended September 30, 2018 and 2017, respectively.

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