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EARNINGS (LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share, Basic and Diluted [Abstract]                      
Income from continuing operations $ 188 $ 342 $ 118 $ 61 $ 185 $ 129 $ 133 $ 104 $ 709 $ 551 $ 814
Income from discontinued operations, net of taxes                 0 5 35
Net income attributable to Quest Diagnostics’ common stockholders $ 188 $ 342 $ 118 $ 61 $ 190 $ 129 $ 133 $ 104 709 556 849
Less: Earnings allocated to participating securities                 3 2 3
Earnings available to Quest Diagnostics' common stockholders - basic and diluted                 $ 706 $ 549 $ 811
Weighted average common shares outstanding - basic                 144 145 152
Stock options and performance share units                 1 0 1
Weighted average common shares outstanding - diluted                 145 145 153
Income from continuing operations, per basic share $ 1.31 $ 2.37 $ 0.82 $ 0.42 $ 1.27 $ 0.89 $ 0.92 $ 0.72 $ 4.92 $ 3.80 $ 5.35
Income (loss) from discontinued operations, per basic share 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.03 0.23
Net income, per basic share 1.31 2.37 0.82 0.42 1.30 0.89 0.92 0.72 4.92 3.83 5.58
Income from continuing operations, per diluted share 1.29 2.35 0.81 0.42 1.26 0.88 0.92 0.71 4.87 3.78 5.31
Income (loss) from discontinued operations, per diluted share 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.03 0.23
Net income, per diluted share $ 1.29 $ 2.35 $ 0.81 $ 0.42 $ 1.29 $ 0.88 $ 0.92 $ 0.71 $ 4.87 $ 3.81 $ 5.54
Stock options and performance share units not included due to their antidilutive effect                 2 2 1