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Earnings Per Share
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share

Earnings per share is computed using the two-class method. Stock appreciation rights and options to purchase 17 million and 15 million shares of common stock were outstanding, but were excluded from the calculation of diluted earnings per share for the three and six months ended June 30, 2020, respectively, because their exercise prices were greater than the average market price of the common shares and, therefore, the effect would be antidilutive. For the same reason, stock appreciation rights and options to purchase 23 million and 19 million shares of common stock were outstanding, but were excluded from the calculation of diluted earnings per share for the three and six months ended June 30, 2019, respectively.

The following is a reconciliation of basic and diluted earnings per share for the respective periods:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
In millions, except per share amounts
2020
 
2019
 
2020
 
2019
Numerator for earnings per share calculation:
 
 
 
 
 
 
 
Net income
$
2,986

 
$
1,931

 
$
4,998

 
$
3,358

Income allocated to participating securities
—

 
(1
)
 
—

 
(3
)
Net (income) loss attributable to noncontrolling interests
(11
)
 
5

 
(16
)
 
(1
)
Net income attributable to CVS Health
$
2,975

 
$
1,935

 
$
4,982

 
$
3,354

 
 
 
 
 
 
 
 
Denominator for earnings per share calculation:
 
 
 
 
 
 
 
Weighted average shares, basic
1,309

 
1,301

 
1,307

 
1,299

Effect of dilutive securities
5

 
1

 
6

 
3

Weighted average shares, diluted
1,314

 
1,302

 
1,313

 
1,302

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Basic
$
2.27

 
$
1.49

 
$
3.81

 
$
2.58

Diluted
$
2.26

 
$
1.49

 
$
3.79

 
$
2.58