CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests		$ 1,636	$ 1,500	$ 1,424
Other comprehensive loss, net of tax and reclassification adjustments:
Unrealized (loss)/gain on derivatives, net	[1]	(58)	12	9
Foreign currency translation adjustments, net		69	(104)	(134)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	[1]	(15)	4	(1)
Benefit plans: Actuarial gain/(loss), net	[1]	0	(9)	2
Total other comprehensive loss, net of tax		(4)	(97)	(124)
Comprehensive income before allocation to noncontrolling interests		1,632	1,403	1,300
Comprehensive loss attributable to noncontrolling interests		(2)	0	(4)
Comprehensive income attributable to Zoetis		$ 1,634	$ 1,403	$ 1,304

[1] Presented net of reclassification adjustments and tax impacts, which are not significant in any period presented. Reclassification adjustments related to benefit plans are generally reclassified, as part of net periodic pension cost, into Cost of sales, Selling, general and administrative expenses, and/or Research and development expenses, as appropriate, in the Consolidated Statements of Income.