v3.26.1
EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 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 June 30,Six Months Ended June 30,
 2026202520262025
Amounts attributable to Quest Diagnostics’ common stockholders:    
Net income attributable to Quest Diagnostics$320 $282 $572 $502 
Less: Earnings allocated to participating securities1 1 2 2 
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
$319 $281 $570 $500 
Weighted average common shares outstanding – basic111 112 110 112 
Effect of dilutive securities:    
Stock options and performance share units1 1 2 1 
Weighted average common shares outstanding – diluted112 113 112 113 
Earnings per share attributable to Quest Diagnostics’ common stockholders:    
Basic$2.88 $2.51 $5.15 $4.48 
Diluted$2.84 $2.47 $5.08 $4.41