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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2022
Earnings Per Share [Abstract]  
EARNINGS PER SHARE EARNINGS PER SHARE
    The computation of basic and diluted earnings per common share is as follows (in millions, except per share data):
 202220212020
Amounts attributable to Quest Diagnostics’ common stockholders:  
Net income attributable to Quest Diagnostics$946 $1,995 $1,431 
Less: Earnings allocated to participating securities4 7 6 
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
$942 $1,988 $1,425 
Weighted average common shares outstanding – basic116 125 134 
Effect of dilutive securities:  
Stock options and performance share units2 3 2 
Weighted average common shares outstanding – diluted118 128 136 
Earnings per share attributable to Quest Diagnostics’ common stockholders:  
Basic$8.10 $15.85 $10.62 
Diluted$7.97 $15.55 $10.47 


    The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
202220212020
Stock options and performance share units— — 1