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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted earnings per common share
The following is a reconciliation of basic and diluted earnings per share from continuing operations for the respective years:
 
In millions, except per share amounts
2016
 
2015
 
2014
Numerator for earnings per share calculation:
 

 
 

 
 

Income from continuing operations
$
5,320

 
$
5,230

 
$
4,645

Income allocated to participating securities
(27
)
 
(26
)
 
(19
)
Net income attributable to noncontrolling interest
(2
)
 
(2
)
 
—

Income from continuing operations attributable to CVS Health
$
5,291

 
$
5,202

 
$
4,626

 
 
 
 
 
 
Denominator for earnings per share calculation:
 

 
 

 
 

Weighted average shares, basic
1,073

 
1,118

 
1,161

Effect of dilutive securities
6

 
8

 
8

Weighted average shares, diluted
1,079

 
1,126

 
1,169

 
 
 
 
 
 
Earnings per share from continuing operations:
 

 
 

 
 

Basic
$
4.93

 
$
4.65

 
$
3.98

Diluted
$
4.91

 
$
4.62

 
$
3.96