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Quarterly Operating Results (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Data [Abstract]                      
Net revenues $ 1,839 $ 1,889 $ 1,919 $ 1,884 $ 1,865 $ 1,856 $ 1,864 $ 1,817 $ 7,531 $ 7,402 $ 7,214
Gross profit 604 667 676 658 671 666 694 652 2,605 2,683  
Net income 139 227 233 189 267 175 207 175 788 824 696
Less: net income attributable to noncontrolling interests 12 14 14 12 13 14 14 11 52 52 51
Net income attributable to Quest Diagnostics $ 127 $ 213 $ 219 $ 177 $ 254 $ 161 $ 193 $ 164 $ 736 $ 772 $ 645
Basic (in dollars per share) $ 0.93 $ 1.56 $ 1.60 $ 1.30 $ 1.86 $ 1.18 $ 1.40 $ 1.19 $ 5.39 $ 5.63 $ 4.58
Diluted (in dollars per share) $ 0.92 $ 1.53 $ 1.57 $ 1.27 $ 1.82 $ 1.15 $ 1.37 $ 1.16 $ 5.29 $ 5.50 $ 4.51