CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests	$ 862	$ 819	$ 339
Other comprehensive income/(loss), net of tax and reclassification adjustments:
Unrealized (loss)/gain on derivatives, net	(11)	10	(2)
Foreign currency translation adjustments, net	98	17	(269)
Benefit plans: Actuarial gain/(loss), net	8	(6)	9
Total other comprehensive income/(loss), net of tax	95	21	(262)
Comprehensive income before allocation to noncontrolling interests	957	840	77
Comprehensive loss attributable to noncontrolling interests	0	(3)	(1)
Comprehensive income attributable to Zoetis	$ 957	$ 843	$ 78