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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share, Basic and Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 155 | $ 192 | $ 195 | $ 103 | $ 188 | $ 342 | $ 118 | $ 61 | $ 645 | $ 709 | $ 551
Income from discontinued operations, net of taxes |  |  |  |  |  |  |  |  | 0 | 0 | 5
Net income attributable to Quest Diagnostics’ common stockholders | $ 155 | $ 192 | $ 195 | $ 103 | $ 188 | $ 342 | $ 118 | $ 61 | 645 | 709 | 556
Less: Earnings allocated to participating securities |  |  |  |  |  |  |  |  | 3 | 3 | 2
Earnings available to Quest Diagnostics' common stockholders - basic and diluted |  |  |  |  |  |  |  |  | $ 642 | $ 706 | $ 549
Weighted average common shares outstanding - basic |  |  |  |  |  |  |  |  | 140 | 144 | 145
Stock options and performance share units |  |  |  |  |  |  |  |  | 2 | 1 | 0
Weighted average common shares outstanding - diluted |  |  |  |  |  |  |  |  | 142 | 145 | 145
Income from continuing operations, per basic share | $ 1.11 | $ 1.37 | $ 1.38 | $ 0.72 | $ 1.31 | $ 2.37 | $ 0.82 | $ 0.42 | $ 4.58 | $ 4.92 | $ 3.80
Income (loss) from discontinued operations, per basic share | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.03
Net income, per basic share | 1.11 | 1.37 | 1.38 | 0.72 | 1.31 | 2.37 | 0.82 | 0.42 | 4.58 | 4.92 | 3.83
Income from continuing operations, per diluted share | 1.09 | 1.34 | 1.37 | 0.71 | 1.29 | 2.35 | 0.81 | 0.42 | 4.51 | 4.87 | 3.78
Income (loss) from discontinued operations, per diluted share | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.03
Net income, per diluted share | $ 1.09 | $ 1.34 | $ 1.37 | $ 0.71 | $ 1.29 | $ 2.35 | $ 0.81 | $ 0.42 | $ 4.51 | $ 4.87 | $ 3.81
Stock options and performance share units not included due to their antidilutive effect |  |  |  |  |  |  |  |  | 1 | 2 | 2

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