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Earnings per Share
3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Earnings per Share following table presents the calculation of basic and diluted earnings per share:
 
 
Three Months Ended
 
 
March 31,
(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)
 
2019
 
2018
Numerator
 
 
 
 
Net income before allocation to noncontrolling interests
 
$
312

 
$
350

Less: Net loss attributable to noncontrolling interests
 

 
(2
)
Net income attributable to Zoetis Inc.
 
$
312

 
$
352

Denominator
 
 
 
 
Weighted-average common shares outstanding
 
479.6

 
485.9

Common stock equivalents: stock options, RSUs, PSUs and DSUs
 
3.5

 
3.9

Weighted-average common and potential dilutive shares outstanding
 
483.1

 
489.8

 
 
 
 
 
Earnings per share attributable to Zoetis Inc. stockholders—basic
 
$
0.65

 
$
0.72

Earnings per share attributable to Zoetis Inc. stockholders—diluted
 
$
0.65

 
$
0.72


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 both the three months ended March 31, 2019 and March 31, 2018.