v3.26.1
EARNINGS PER SHARE
 3 Months Ended
Mar. 31, 2026
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,
 20262025
Amounts attributable to Quest Diagnostics’ common stockholders:  
Net income attributable to Quest Diagnostics$252 $220 
Less: Earnings allocated to participating securities1 1 
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
$251 $219 
Weighted average common shares outstanding – basic110 111 
Effect of dilutive securities:  
Stock options and performance share units2 2 
Weighted average common shares outstanding – diluted112 113 
Earnings per share attributable to Quest Diagnostics’ common stockholders:  
Basic$2.27 $1.97 
Diluted$2.24 $1.94