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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Amounts attributable to Quest Diagnostics’ common stockholders:        
Net income attributable to Quest Diagnostics $ 234 $ 631 $ 589 $ 1,100
Less: Earnings allocated to participating securities 1 3 2 4
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted $ 233 $ 628 $ 587 $ 1,096
Weighted average common shares outstanding - basic 117 125 118 129
Stock options and performance share units 2 2 2 2
Weighted average common shares outstanding - diluted 119 127 120 131
Basic (in dollars per share) $ 2.00 $ 5.05 $ 4.97 $ 8.52
Diluted (in dollars per share) $ 1.96 $ 4.96 $ 4.88 $ 8.38
Stock options and performance share units 1 1 0 1