CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests		$ 1,424	$ 862	$ 819
Other comprehensive income/(loss), net of tax and reclassification adjustments:
Unrealized (loss)/gain on derivatives, net	[1]	(1)	(11)	10
Foreign currency translation adjustments, net		(125)	98	17
Benefit plans: Actuarial gain/(loss), net	[1]	2	8	(6)
Total other comprehensive income/(loss), net of tax		(124)	95	21
Comprehensive income before allocation to noncontrolling interests		1,300	957	840
Comprehensive loss attributable to noncontrolling interests		(4)	0	(3)
Comprehensive income attributable to Zoetis		$ 1,304	$ 957	$ 843

[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.