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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2021
Earnings Per Share, Basic and Diluted [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):
 202120202019
Amounts attributable to Quest Diagnostics’ common stockholders:  
Income from continuing operations$1,995 $1,431 $838 
Income from discontinued operations, net of taxes— — 20 
Net income attributable to Quest Diagnostics' common stockholders$1,995 $1,431 $858 
Income from continuing operations$1,995 $1,431 $838 
Less: Earnings allocated to participating securities7 6 3 
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
$1,988 $1,425 $835 
Weighted average common shares outstanding – basic125 134 134 
Effect of dilutive securities:  
Stock options and performance share units3 2 2 
Weighted average common shares outstanding – diluted128 136 136 
Earnings per share attributable to Quest Diagnostics’ common stockholders - basic:
  
Income from continuing operations$15.85 $10.62 $6.21 
Income from discontinued operations— — 0.15 
Net income$15.85 $10.62 $6.36 
Earnings per share attributable to Quest Diagnostics’ common stockholders - diluted:
Income from continuing operations$15.55 $10.47 $6.13 
Income from discontinued operations— — 0.15 
Net income$15.55 $10.47 $6.28 

    In April 2021, the Company entered into ASRs with several financial institutions to repurchase $1.5 billion of the Company's common stock as part of the Company's share repurchase program. See Note 16 for further details.

    The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
202120202019
Stock options and performance share units— 1 3