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Earnings (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2019
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 respective periods:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
In millions, except per share amounts
2019
 
2018
 
2019
 
2018
Numerator for earnings (loss) per share calculation:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
1,529

 
$
1,390

 
$
4,887

 
$
(174
)
Income from continuing operations allocated to participating securities
—

 
(1
)
 
(3
)
 
(3
)
Loss from continuing operations attributable to noncontrolling interest
1

 
—

 
—

 
—

Income (loss) from continuing operations attributable to CVS Health
$
1,530

 
$
1,389

 
$
4,884

 
$
(177
)
 
 
 
 
 
 
 
 
Denominator for earnings (loss) per share calculation:
 
 
 
 
 
 
 
Weighted average shares, basic
1,302

 
1,020

 
1,300

 
1,018

Effect of dilutive securities
3

 
2

 
3

 
—

Weighted average shares, diluted
1,305

 
1,022

 
1,303

 
1,018

 
 
 
 
 
 
 
 
Earnings (loss) per share from continuing operations:
 
 
 
 
 
 
 
Basic
$
1.17

 
$
1.36

 
$
3.76

 
$
(0.17
)
Diluted
$
1.17

 
$
1.36

 
$
3.75

 
$
(0.17
)