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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted earnings per common share
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