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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
EARNINGS PER SHARE EARNINGS PER SHARE
    The computation of basic and diluted earnings per common share for the years ended December 31, 2023, 2022 and 2021 is as follows (in millions, except per share data):
 202320222021
Amounts attributable to Quest Diagnostics’ common stockholders:  
Net income attributable to Quest Diagnostics$854 $946 $1,995 
Less: Earnings allocated to participating securities4 4 7 
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
$850 $942 $1,988 
Weighted average common shares outstanding – basic112 116 125 
Effect of dilutive securities:  
Stock options and performance share units1 2 3 
Weighted average common shares outstanding – diluted113 118 128 
Earnings per share attributable to Quest Diagnostics’ common stockholders:  
Basic$7.59 $8.10 $15.85 
Diluted$7.49 $7.97 $15.55