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Earnings per Share
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Earnings per Share
Earnings per Share
The following table presents the calculation of basic and diluted earnings per share:
 
 
Three Months Ended
 
 
March 31,

 
April 2,

(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)
 
2018

 
2017

Numerator
 
 
 
 
Net income before allocation to noncontrolling interests
 
$
350

 
$
239

Less: Net (loss)/income attributable to noncontrolling interests
 
(2
)
 
1

Net income attributable to Zoetis Inc.
 
$
352

 
$
238

Denominator
 
 
 
 
Weighted-average common shares outstanding
 
485.9

 
492.4

Common stock equivalents: stock options, RSUs, PSUs and DSUs
 
3.9

 
2.9

Weighted-average common and potential dilutive shares outstanding
 
489.8

 
495.3

 
 
 
 
 
Earnings per share attributable to Zoetis Inc. stockholders—basic
 
$
0.72

 
$
0.48

Earnings per share attributable to Zoetis Inc. stockholders—diluted
 
$
0.72

 
$
0.48


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 the three months ended March 31, 2018, and approximately 1 million for the three months ended April 2, 2017.