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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Amounts attributable to Quest Diagnostics’ common stockholders:        
Income from continuing operations $ 185 $ 206 $ 284 $ 370
Income from discontinued operations, net of taxes 0 20 0 20
Net income attributable to Quest Diagnostics 185 226 284 390
Less: Earnings allocated to participating securities 1 0 1 1
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted $ 184 $ 206 $ 283 $ 369
Weighted average common shares outstanding - basic 134 135 134 134
Stock options and performance share units 2 1 1 2
Weighted average common shares outstanding - diluted 136 136 135 136
Earnings per share attributable to Quest Diagnostics’ common stockholders - basic:        
Income from continuing operations (in dollars per share) $ 1.38 $ 1.52 $ 2.12 $ 2.74
Income from discontinued operations (in dollars per share) 0 0.15 0 0.15
Net income (in dollars per share) 1.38 1.67 2.12 2.89
Earnings per share attributable to Quest Diagnostics’ common stockholders - diluted:        
Income from continuing operations (in dollars per share) 1.36 1.51 2.09 2.71
Income from discontinued operations (in dollars per share) 0 0.15 0 0.15
Net income (in dollars per share) $ 1.36 $ 1.66 $ 2.09 $ 2.86
Stock options 1 5 2 5