Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator
Net income before allocation to noncontrolling interests	$ 594	$ 558
Less: Net loss attributable to noncontrolling interests	(1)	(1)
Net income attributable to Zoetis Inc.	$ 595	$ 559
Denominator
Weighted-average common shares outstanding	472,200,000	475,500,000
Common stock equivalents: stock options, RSUs, PSUs and DSUs	1,900,000	2,400,000
Weighted-average common and potential dilutive shares outstanding	474,100,000	477,900,000
Earnings per share attributable to Zoetis stockholders—basic (in dollars per share)	$ 1.26	$ 1.18
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share)	$ 1.26	$ 1.17
Antidilutive securities excluded from computation of earnings per share, amount	0	0