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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share
The following is a reconciliation of basic and diluted earnings per share for the respective periods:
 
Three Months Ended
March 31,
In millions, except per share amounts
2020
 
2019
Numerator for earnings per share calculation:
 
 
 
Net income
$
2,012

 
$
1,427

Income allocated to participating securities
—

 
(2
)
Net income attributable to noncontrolling interests
(5
)
 
(6
)
Net income attributable to CVS Health
$
2,007

 
$
1,419

 
 
 
 
Denominator for earnings per share calculation:
 
 
 
Weighted average shares, basic
1,306

 
1,298

Effect of dilutive securities
6

 
4

Weighted average shares, diluted
1,312

 
1,302

 
 
 
 
Earnings per share:
 
 
 
Basic
$
1.54

 
$
1.09

Diluted
$
1.53

 
$
1.09