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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement [Abstract] |  |  |  |
Net revenues | $ 1,956 | $ 1,889 | $ 5,800 | $ 5,692
Operating costs and expenses and other operating income: |  |  |  |
Cost of services | 1,264 | 1,222 | 3,773 | 3,691
Selling, general and administrative | 362 | 354 | 1,108 | 1,068
Amortization of intangible assets | 23 | 22 | 72 | 66
Other operating income, net | (6) | (13) | (21) | (14)
Total operating costs and expenses, net | 1,643 | 1,585 | 4,932 | 4,811
Operating income | 313 | 304 | 868 | 881
Other income (expense): |  |  |  |
Interest expense, net | (44) | (41) | (133) | (124)
Other income, net | 1 | 3 | 13 | 2
Total non-operating expenses, net | (43) | (38) | (120) | (122)
Income from continuing operations before income taxes and equity in earnings of equity method investees | 270 | 266 | 748 | 759
Income tax expense | (62) | (48) | (175) | (142)
Equity in earnings of equity method investees, net of taxes | 18 | 9 | 48 | 32
Income from continuing operations | 226 | 227 | 621 | 649
Income from discontinued operations, net of taxes | 0 | 0 | 20 | 0
Net income | 226 | 227 | 641 | 649
Less: Net income attributable to noncontrolling interests | 11 | 14 | 36 | 40
Net income attributable to Quest Diagnostics | 215 | 213 | 605 | 609
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |
Income from continuing operations | 215 | 213 | 585 | 609
Income from discontinued operations, net of taxes | 0 | 0 | 20 | 0
Net income attributable to Quest Diagnostics | $ 215 | $ 213 | $ 605 | $ 609
Earnings per share attributable to Quest Diagnostics’ common stockholders - basic: |  |  |  |
Income from continuing operations (in dollars per share) | $ 1.59 | $ 1.56 | $ 4.33 | $ 4.46
Income from discontinued operations (in dollars per share) | 0 | 0 | 0.15 | 0
Net income (in dollars per share) | 1.59 | 1.56 | 4.48 | 4.46
Earnings per share attributable to Quest Diagnostics’ common stockholders - diluted: |  |  |  |
Income from continuing operations (in dollars per share) | 1.56 | 1.53 | 4.27 | 4.37
Income from discontinued operations (in dollars per share) | 0 | 0 | 0.15 | 0
Net income (in dollars per share) | $ 1.56 | $ 1.53 | $ 4.42 | $ 4.37
Weighted average common shares outstanding: |  |  |  |
Basic (in Shares) | 135 | 136 | 135 | 136
Diluted (in Shares) | 137 | 139 | 136 | 139

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