Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Numerator
Net income before allocation to noncontrolling interests	$ 237	$ 190	$ 665	$ 319
Less: net income (loss) attributable to noncontrolling interests	(2)	1	(2)	2
Net income attributable to Zoetis Inc.	$ 239	$ 189	$ 667	$ 317
Denominator
Weighted-average common shares outstanding	495.2	499.2	496.3	500.2
Common stock equivalents: stock options, RSUs, PSUs and DSUs	2.7	2.5	2.5	2.3
Weighted-average common and potential dilutive shares outstanding	497.9	501.7	498.8	502.5
Earnings per share attributable to Zoetis stockholders—basic (in dollars per share)	$ 0.48	$ 0.38	$ 1.34	$ 0.63
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share)	$ 0.48	$ 0.38	$ 1.34	$ 0.63
Employee Stock Option [Member]
Denominator
Antidilutive securities excluded from computation of earnings per share, amount	1.0	1.0	1.0	1.0