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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2017
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):

 
2017
 
2016
 
2015
Amounts attributable to Quest Diagnostics’ common stockholders:
 

 
 

 
 
Net income attributable to Quest Diagnostics
$
772

 
$
645

 
$
709

Less: Earnings allocated to participating securities
3

 
3

 
3

Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
$
769

 
$
642

 
$
706

 
 
 
 
 
 
Weighted average common shares outstanding – basic
137

 
140

 
144

Effect of dilutive securities:
 

 
 

 
 
Stock options and performance share units
3

 
2

 
1

Weighted average common shares outstanding – diluted
140

 
142

 
145

 
 
 
 
 
 
Earnings per share attributable to Quest Diagnostics’ common stockholders:
 

 
 

 
 
Basic
$
5.63

 
$
4.58

 
$
4.92

Diluted
$
5.50

 
$
4.51

 
$
4.87



The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
 
2017
 
2016
 
2015
 
 
 
 
 
 
Stock options
2

 
1

 
2