Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator
Net income before allocation to noncontrolling interests	$ 376	$ 371	$ 799	$ 683
Less: Net loss attributable to noncontrolling interests	(1)	0	(1)	0
Net income attributable to Zoetis Inc.	$ 377	$ 371	$ 800	$ 683
Denominator
Weighted-average common shares outstanding	475,300	478,800	475,400	479,200
Common stock equivalents: stock options, RSUs, PSUs and DSUs	2,800	3,500	3,200	3,500
Weighted-average common and potential dilutive shares outstanding	478,100	482,300	478,600	482,700
Earnings per share attributable to Zoetis stockholders—basic (in dollars per share)	$ 0.79	$ 0.77	$ 1.68	$ 1.43
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share)	$ 0.79	$ 0.77	$ 1.67	$ 1.41
Antidilutive securities excluded from computation of earnings per share, amount	0		0