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Quarterly Operating Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 1,936 | $ 1,931 | $ 1,943 | $ 1,899 | $ 1,861 | $ 1,885 | $ 1,906 | $ 1,863 | $ 7,709 | $ 7,515 | $ 7,493
Gross profit | 742 | 741 | 773 | 734 | 701 | 728 | 751 | 719 | 2,990 | 2,899 |
Net income | 267 | 175 | 207 | 175 | 167 | 205 | 209 | 115 | 824 | 696 | 753
Less: net income attributable to noncontrolling interests | 13 | 14 | 14 | 11 | 12 | 13 | 14 | 12 | 52 | 51 | 44
Net income attributable to Quest Diagnostics | $ 254 | $ 161 | $ 193 | $ 164 | $ 155 | $ 192 | $ 195 | $ 103 | $ 772 | $ 645 | $ 709
Basic (in dollars per share) | $ 1.86 | $ 1.18 | $ 1.40 | $ 1.19 | $ 1.11 | $ 1.37 | $ 1.38 | $ 0.72 | $ 5.63 | $ 4.58 | $ 4.92
Diluted (in dollars per share) | $ 1.82 | $ 1.15 | $ 1.37 | $ 1.16 | $ 1.09 | $ 1.34 | $ 1.37 | $ 0.71 | $ 5.50 | $ 4.51 | $ 4.87

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