Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator
Net income before allocation to noncontrolling interests	$ 384	$ 433	$ 371	$ 312	$ 345	$ 347	$ 382	$ 350	$ 1,500	$ 1,424	$ 862
Less: net loss attributable to noncontrolling interests	0	0	0	0	0	0	(2)	(2)	0	(4)	(2)
Net income attributable to Zoetis Inc.	$ 384	$ 433	$ 371	$ 312	$ 345	$ 347	$ 384	$ 352	$ 1,500	$ 1,428	$ 864
Denominator
Weighted-average common shares outstanding									478,128	483,063	489,918
Common stock equivalents: stock options, RSUs, DSUs and PSUs									3,659	3,835	3,243
Weighted-average common and potential dilutive shares outstanding									481,787	486,898	493,161
Earnings per share attributable to Zoetis Inc. stockholders—basic (in dollars per share)	$ 0.81	$ 0.91	$ 0.77	$ 0.65	$ 0.72	$ 0.72	$ 0.79	$ 0.72	$ 3.14	$ 2.96	$ 1.76
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share)	$ 0.80	$ 0.90	$ 0.77	$ 0.65	$ 0.71	$ 0.71	$ 0.79	$ 0.72	$ 3.11	$ 2.93	$ 1.75
Stock Options
Denominator
Number of stock options excluded from the computation of diluted earnings per share											1,000