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Earnings (Loss) Per Share (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
In millions, except per share amounts
2019
 
2018
 
2019
 
2018
Numerator for earnings (loss) per share calculation:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
1,931

 
$
(2,562
)
 
$
3,358

 
$
(1,564
)
Income from continuing operations allocated to participating securities
(1
)
 
(1
)
 
(3
)
 
(3
)
(Income) loss from continuing operations attributable to noncontrolling interest
5

 
—

 
(1
)
 
—

Income (loss) from continuing operations attributable to CVS Health
$
1,935

 
$
(2,563
)
 
$
3,354

 
$
(1,567
)
 
 
 
 
 
 
 
 
Denominator for earnings (loss) per share calculation:
 
 
 
 
 
 
 
Weighted average shares, basic
1,301

 
1,018

 
1,299

 
1,017

Effect of dilutive securities
1

 
—

 
3

 
—

Weighted average shares, diluted
1,302

 
1,018

 
1,302

 
1,017

 
 
 
 
 
 
 
 
Earnings (loss) per share from continuing operations:
 
 
 
 
 
 
 
Basic
$
1.49

 
$
(2.52
)
 
$
2.58

 
$
(1.54
)
Diluted
$
1.49

 
$
(2.52
)
 
$
2.58

 
$
(1.54
)