Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator
Net income before allocation to noncontrolling interests	$ 1,636	$ 1,500	$ 1,424
Less: net loss attributable to noncontrolling interests	(2)	0	(4)
Net income attributable to Zoetis Inc.	$ 1,638	$ 1,500	$ 1,428
Denominator
Weighted-average common shares outstanding	475,502	478,128	483,063
Common stock equivalents: stock options, RSUs, DSUs and PSUs	3,067	3,659	3,835
Weighted-average common and potential dilutive shares outstanding	478,569	481,787	486,898
Earnings per share attributable to Zoetis Inc. stockholders—basic (in dollars per share)	$ 3.44	$ 3.14	$ 2.96
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share)	$ 3.42	$ 3.11	$ 2.93