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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings Per Share
The following is a reconciliation of basic and diluted earnings (loss) per share from continuing operations for the years ended December 31:
In millions, except per share amounts
2018
 
2017
 
2016
Numerator for earnings per share calculation:
 
 
 
 
 
Income (loss) from continuing operations
$
(596
)
 
$
6,631

 
$
5,320

Income allocated to participating securities
(3
)
 
(24
)
 
(27
)
Net (income) loss attributable to noncontrolling interests
2

 
(1
)
 
(2
)
Income (loss) from continuing operations attributable to CVS Health
$
(597
)
 
$
6,606

 
$
5,291

 
 
 
 
 
 
Denominator for earnings per share calculation:
 
 
 
 
 
Weighted average shares, basic
1,044

 
1,020

 
1,073

Effect of dilutive securities
—

 
4

 
6

Weighted average shares, diluted
1,044

 
1,024

 
1,079

 
 
 
 
 
 
Earnings (loss) per share from continuing operations:
 
 
 
 
 
Basic
$
(0.57
)
 
$
6.48

 
$
4.93

Diluted
$
(0.57
)
 
$
6.45

 
$
4.91