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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement [Abstract] |  |  |  |
Net revenues | $ 1,889 | $ 1,856 | $ 5,692 | $ 5,537
Operating costs and expenses and other operating income: |  |  |  |
Cost of services | 1,222 | 1,190 | 3,691 | 3,525
Selling, general and administrative | 354 | 348 | 1,068 | 1,061
Amortization of intangible assets | 22 | 19 | 66 | 54
Other operating (income) expense, net | (13) | 1 | (14) | 1
Total operating costs and expenses, net | 1,585 | 1,558 | 4,811 | 4,641
Operating income | 304 | 298 | 881 | 896
Other income (expense): |  |  |  |
Interest expense, net | (41) | (38) | (124) | (112)
Other income (expense), net | 3 | (2) | 2 | 12
Total non-operating expenses, net | (38) | (40) | (122) | (100)
Income before income taxes and equity in earnings of equity method investees | 266 | 258 | 759 | 796
Income tax expense | (48) | (92) | (142) | (264)
Equity in earnings of equity method investees, net of taxes | 9 | 9 | 32 | 25
Net income | 227 | 175 | 649 | 557
Less: Net income attributable to noncontrolling interests | 14 | 14 | 40 | 39
Net income attributable to Quest Diagnostics | $ 213 | $ 161 | $ 609 | $ 518
Earnings per share attributable to Quest Diagnostics’ common stockholders: |  |  |  |
Basic (per share) | $ 1.56 | $ 1.18 | $ 4.46 | $ 3.77
Diluted (per share) | $ 1.53 | $ 1.15 | $ 4.37 | $ 3.68
Weighted average common shares outstanding: |  |  |  |
Basic (in Shares) | 136 | 137 | 136 | 137
Diluted (in Shares) | 139 | 140 | 139 | 140
Dividends per common share | $ 0.5 | $ 0.45 | $ 1.5 | $ 1.35

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