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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share The following table presents the calculation of basic and diluted earnings per share:
Three Months EndedNine Months Ended
(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)September 30,September 30,
2021202020212020
Numerator
Net income before allocation to noncontrolling interests$552 $479 $1,621 $1,278 
Less: Net loss attributable to noncontrolling interests— — (2)(1)
Net income attributable to Zoetis Inc.$552 $479 $1,623 $1,279 
Denominator
Weighted-average common shares outstanding474.0 475.5 474.8 475.5 
Common stock equivalents: stock options, RSUs, PSUs and DSUs2.3 3.0 2.3 3.0 
Weighted-average common and potential dilutive shares outstanding476.3 478.5 477.1 478.5 
Earnings per share attributable to Zoetis Inc. stockholders—basic$1.16 $1.01 $3.42 $2.69 
Earnings per share attributable to Zoetis Inc. stockholders—diluted$1.16 $1.00 $3.40 $2.67