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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2018
Apr. 02, 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 stockholders—basic (in dollars per share) $ 0.72 $ 0.48
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share) $ 0.72 $ 0.48
Stock options    
Denominator    
Antidilutive securities excluded from computation of earnings per share, amount 1.0