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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Amounts attributable to Quest Diagnostics’ common stockholders:        
Net income attributable to Quest Diagnostics $ 245 $ 226 $ 747 $ 649
Less: Earnings allocated to participating securities 2 1 4 3
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted $ 243 $ 225 $ 743 $ 646
Weighted average common shares outstanding - basic 112 112 112 111
Stock options and performance share units 1 1 1 1
Weighted average common shares outstanding - diluted 113 113 113 112
Basic (in dollars per share) $ 2.18 $ 2.01 $ 6.66 $ 5.80
Diluted (in dollars per share) $ 2.16 $ 1.99 $ 6.57 $ 5.74
Stock options and performance share units (in shares) 0 0 0 1