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Earnings per Share (Tables)
 6 Months Ended
Jun. 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 EndedSix Months Ended
(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)June 30,June 30,
2021202020212020
Numerator
Net income before allocation to noncontrolling interests$511 $376 $1,069 $799 
Less: Net loss attributable to noncontrolling interests(1)(1)(2)(1)
Net income attributable to Zoetis Inc.$512 $377 $1,071 $800 
Denominator
Weighted-average common shares outstanding474.8 475.3 475.2 475.4 
Common stock equivalents: stock options, RSUs, PSUs and DSUs2.2 2.8 2.3 3.2 
Weighted-average common and potential dilutive shares outstanding477.0 478.1 477.5 478.6 
Earnings per share attributable to Zoetis Inc. stockholders—basic$1.08 $0.79 $2.25 $1.68 
Earnings per share attributable to Zoetis Inc. stockholders—diluted$1.07 $0.79 $2.24 $1.67