CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests	$ 312	$ 350
Other comprehensive income, net of taxes and reclassification adjustments:
Foreign currency translation adjustments, net	31	77
Total other comprehensive income, net of tax	31	77
Comprehensive income before allocation to noncontrolling interests	343	427
Less: Comprehensive loss attributable to noncontrolling interests	0	(1)
Comprehensive income attributable to Zoetis Inc.	$ 343	$ 428