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EARNINGS PER SHARE
 3 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
EARNINGS (LOSS) PER SHARE EARNINGS PER SHARE
    The computation of basic and diluted earnings per common share was as follows (in millions, except per share data):
Three Months Ended March 31,
 20242023
Amounts attributable to Quest Diagnostics’ common stockholders:  
Net income attributable to Quest Diagnostics$194 $202 
Less: Earnings allocated to participating securities1 1 
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
$193 $201 
Weighted average common shares outstanding – basic111 112 
Effect of dilutive securities:  
Stock options and performance share units1 1 
Weighted average common shares outstanding – diluted112 113 
Earnings per share attributable to Quest Diagnostics’ common stockholders:  
Basic$1.74 $1.80 
Diluted$1.72 $1.78 
    

    The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
Three Months Ended March 31,
20242023
Stock options and performance share units1 —