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Quarterly Operating Results (unaudited) (Schedule) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 1,926 | $ 1,956 | $ 1,953 | $ 1,891 | $ 1,839 | $ 1,889 | $ 1,919 | $ 1,884 | $ 7,726 | $ 7,531 | $ 7,402
Gross profit | 662 | 692 | 688 | 647 | 604 | 667 | 676 | 658 | 2,689 | 2,605 |
Income from continuing operations | 265 | 226 | 219 | 176 | 139 | 227 | 233 | 189 | 886 | 788 | 824
Income (loss) from discontinued operations, net of taxes | 0 | 0 | 20 | 0 | 0 | 0 | 0 | 0 | 20 | 0 | 0
Net income | 265 | 226 | 239 | 176 | 139 | 227 | 233 | 189 | 906 | 788 | 824
Less: net income attributable to noncontrolling interests | 12 | 11 | 13 | 12 | 12 | 14 | 14 | 12 | 48 | 52 | 52
Net income attributable to Quest Diagnostics | $ 253 | $ 215 | $ 226 | $ 164 | $ 127 | $ 213 | $ 219 | $ 177 | $ 858 | $ 736 | $ 772
Earnings per share attributable to Quest Diagnostics’ common stockholders - basic: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) | $ 1.88 | $ 1.59 | $ 1.52 | $ 1.22 | $ 0.93 | $ 1.56 | $ 1.60 | $ 1.30 | $ 6.21 | $ 5.39 | $ 5.63
Income from discontinued operations (in dollars per share) | 0 | 0 | 0.15 | 0 | 0 | 0 | 0 | 0 | 0.15 | 0 | 0
Net income (in dollars per share) | 1.88 | 1.59 | 1.67 | 1.22 | 0.93 | 1.56 | 1.60 | 1.30 | 6.36 | 5.39 | 5.63
Earnings per share attributable to Quest Diagnostics’ common stockholders - diluted: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) | 1.86 | 1.56 | 1.51 | 1.20 | 0.92 | 1.53 | 1.57 | 1.27 | 6.13 | 5.29 | 5.50
Income from discontinued operations (in dollars per share) | 0 | 0 | 0.15 | 0 | 0 | 0 | 0 | 0 | 0.15 | 0 | 0
Net income (in dollars per share) | $ 1.86 | $ 1.56 | $ 1.66 | $ 1.20 | $ 0.92 | $ 1.53 | $ 1.57 | $ 1.27 | $ 6.28 | $ 5.29 | $ 5.50

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