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EARNINGS PER SHARE
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
 2024202320242023
Amounts attributable to Quest Diagnostics’ common stockholders:    
Net income attributable to Quest Diagnostics$229 $235 $423 $437 
Less: Earnings allocated to participating securities1 1 2 2 
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
$228 $234 $421 $435 
Weighted average common shares outstanding – basic111 112 111 112 
Effect of dilutive securities:    
Stock options and performance share units1 2 1 2 
Weighted average common shares outstanding – diluted112 114 112 114 
Earnings per share attributable to Quest Diagnostics’ common stockholders:    
Basic$2.05 $2.08 $3.79 $3.88 
Diluted$2.03 $2.05 $3.75 $3.83 
    

    The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Stock options and performance share units1 — 1 —