Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator
Net income before allocation to noncontrolling interests	$ 2,034	$ 1,636	$ 1,500
Less: net loss attributable to noncontrolling interests	(3)	(2)	0
Net income attributable to Zoetis Inc.	$ 2,037	$ 1,638	$ 1,500
Denominator
Weighted-average common shares outstanding	474,348	475,502	478,128
Common stock equivalents: stock options, RSUs, DSUs and PSUs	2,369	3,067	3,659
Weighted-average common and potential dilutive shares outstanding	476,717	478,569	481,787
Earnings per share attributable to Zoetis Inc. stockholders—basic (in dollars per share)	$ 4.29	$ 3.44	$ 3.14
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share)	$ 4.27	$ 3.42	$ 3.11