Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator
Net income before allocation to noncontrolling interests	$ 511	$ 376	$ 1,069	$ 799
Less: Net loss attributable to noncontrolling interests	(1)	(1)	(2)	(1)
Net income attributable to Zoetis Inc.	$ 512	$ 377	$ 1,071	$ 800
Denominator
Weighted-average common shares outstanding	474,800,000	475,300,000	475,200,000	475,400,000
Common stock equivalents: stock options, RSUs, PSUs and DSUs	2,200,000	2,800,000	2,300,000	3,200,000
Weighted-average common and potential dilutive shares outstanding	477,000,000.0	478,100,000	477,500,000	478,600,000
Earnings per share attributable to Zoetis stockholders—basic (in dollars per share)	$ 1.08	$ 0.79	$ 2.25	$ 1.68
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share)	$ 1.07	$ 0.79	$ 2.24	$ 1.67
Antidilutive securities excluded from computation of earnings per share, amount	0	0	0	0
Other current liabilities	$ 8	$ 5	$ 8	$ 5