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Earnings Per Share
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Earnings per Share following table presents the calculation of basic and diluted earnings per share:
 
 
Year Ended December 31,
(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)
 
2019

 
2018

 
2017

Numerator
 
 
 
 
 
 
Net income before allocation to noncontrolling interests
 
$
1,500

 
$
1,424

 
$
862

Less: net loss attributable to noncontrolling interests
 
—

 
(4
)
 
(2
)
Net income attributable to Zoetis Inc.
 
$
1,500

 
$
1,428

 
$
864

Denominator
 
 
 
 
 
 
Weighted-average common shares outstanding
 
478.128

 
483.063

 
489.918

Common stock equivalents: stock options, RSUs, DSUs and PSUs
 
3.659

 
3.835

 
3.243

Weighted-average common and potential dilutive shares outstanding
 
481.787

 
486.898

 
493.161

Earnings per share attributable to Zoetis Inc. stockholders—basic
 
$
3.14

 
$
2.96

 
$
1.76

Earnings per share attributable to Zoetis Inc. stockholders—diluted
 
$
3.11

 
$
2.93

 
$
1.75


The number of stock options outstanding under the company's Equity Plan that were excluded from the computation of diluted earnings per share, as the effect would have been antidilutive, were de minimis for December 31, 2019, and December 31, 2018 and approximately 1 million shares as of December 31, 2017.