Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Apr. 03, 2016	Mar. 29, 2015
Numerator
Net income before allocation to noncontrolling interests	$ 204	$ 165
Less: net income attributable to noncontrolling interests	0	0
Net income attributable to Zoetis Inc.	$ 204	$ 165
Denominator
Weighted-average common shares outstanding	497.4	501.1
Common stock equivalents: stock options, RSUs, PSUs and DSUs	2.1	2.1
Weighted-average common and potential dilutive shares outstanding	499.5	503.2
Earnings per share attributable to Zoetis stockholders—basic (in dollars per share)	$ 0.41	$ 0.33
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share)	$ 0.41	$ 0.33
Stock Options
Denominator
Antidilutive securities excluded from computation of earnings per share, amount	1.0	1.0