Earnings Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			3,000,000	2,000,000
Numerator
Net income before allocation to noncontrolling interests	$ 167	$ 131	$ 461	$ 399
Less: net income attributable to noncontrolling interests	1	0	4	0
Net income attributable to Zoetis Inc.	$ 166	$ 131	$ 457	$ 399
Denominator
Weighted-average common shares outstanding	501,453,000	500,000,000	500,887,000	500,000,000
Common stock equivalents: stock options, RSUs and DSUs	992,000	354,000	723,000	227,000
Weighted-average common and potential dilutive shares outstanding	502,445,000	500,354,000	501,610,000	500,227,000
Earnings per share attributable to Zoetis stockholders—basic (in dollars per share)	$ 0.33	$ 0.26	$ 0.91	$ 0.80
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share)	$ 0.33	$ 0.26	$ 0.91	$ 0.80