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Earnings Per Share
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
 
Earnings per share is computed using the two-class method. Options to purchase 7.8 million and 5.7 million shares of common stock were outstanding, but were not included in the calculation of diluted earnings per share, for the three and six months ended June 30, 2016, respectively, because the options’ exercise prices were greater than the average market price of the common shares and, therefore, the effect would be antidilutive. For the same reason, options to purchase approximately 3.6 million and 1.8 million shares of common stock were outstanding, but were not included in the calculation of diluted earnings per share for the three and six months ended June 30, 2015, respectively.

The following is a reconciliation of basic and diluted net income per share attributable to CVS Health for the respective periods:
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
In millions, except per share amounts
2016
 
2015
 
2016
 
2015
Numerator for earnings per share calculations:
 
 
 
 
 
 
 
Net income attributable to CVS Health
$
924

 
$
1,272

 
$
2,070

 
$
2,493

Income allocated to participating securities
(4
)
 
(7
)
 
(10
)
 
(12
)
Income available for common shareholders
$
920

 
$
1,265

 
$
2,060

 
$
2,481

 
 
 
 
 
 
 
 
Denominators for earnings per share calculations:
 

 
 

 
 

 
 

Weighted average shares, basic
1,070

 
1,124

 
1,081

 
1,126

Effect of dilutive securities
5

 
8

 
6

 
8

Weighted average shares, diluted
1,075

 
1,132

 
1,087

 
1,134

 
 
 
 
 
 
 
 
Net income per share attributable to CVS Health:
 

 
 

 
 

 
 

Basic
$
0.86

 
$
1.13

 
$
1.91

 
$
2.20

Diluted
$
0.86

 
$
1.12

 
$
1.90

 
$
2.19