Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
Numerator
Net income before allocation to noncontrolling interests	$ 239	$ 204
Less: net income attributable to noncontrolling interests	1	0
Net income attributable to Zoetis Inc.	$ 238	$ 204
Denominator
Weighted-average common shares outstanding	492.4	497.4
Common stock equivalents: stock options, RSUs, PSUs and DSUs	2.9	2.1
Weighted-average common and potential dilutive shares outstanding	495.3	499.5
Earnings per share attributable to Zoetis stockholders—basic (in dollars per share)	$ 0.48	$ 0.41
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share)	$ 0.48	$ 0.41
Stock options
Denominator
Antidilutive securities excluded from computation of earnings per share, amount	1.0	1.0