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EARNINGS PER SHARE
 9 Months Ended
Sep. 30, 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 September 30,Nine Months Ended September 30,
 2024202320242023
Amounts attributable to Quest Diagnostics’ common stockholders:    
Net income attributable to Quest Diagnostics$226 $225 $649 $662 
Less: Earnings allocated to participating securities1 2 3 4 
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
$225 $223 $646 $658 
Weighted average common shares outstanding – basic112 112 111 112 
Effect of dilutive securities:    
Stock options and performance share units1 2 1 2 
Weighted average common shares outstanding – diluted113 114 112 114 
Earnings per share attributable to Quest Diagnostics’ common stockholders:    
Basic$2.01 $1.99 $5.80 $5.87 
Diluted$1.99 $1.96 $5.74 $5.79 
    

    The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Stock options and performance share units— 1 1 —