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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted earnings (loss) per share
The following is a reconciliation of basic and diluted earnings (loss) per share from continuing operations for the years ended December 31, 2019, 2018 and 2017:
In millions, except per share amounts
2019
 
2018
 
2017
Numerator for earnings (loss) per share calculation:
 
 
 
 
 
Income (loss) from continuing operations
$
6,631

 
$
(596
)
 
$
6,631

Income allocated to participating securities
(5
)
 
(3
)
 
(24
)
Net (income) loss attributable to noncontrolling interests
3

 
2

 
(1
)
Income (loss) from continuing operations attributable to CVS Health
$
6,629

 
$
(597
)
 
$
6,606

 
 
 
 
 
 
Denominator for earnings (loss) per share calculation:
 
 
 
 
 
Weighted average shares, basic
1,301

 
1,044

 
1,020

Effect of dilutive securities
4

 
—

 
4

Weighted average shares, diluted
1,305

 
1,044

 
1,024

 
 
 
 
 
 
Earnings (loss) per share from continuing operations:
 
 
 
 
 
Basic
$
5.10

 
$
(0.57
)
 
$
6.48

Diluted
$
5.08

 
$
(0.57
)
 
$
6.45