CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests	$ 552	$ 479	$ 1,621	$ 1,278
Other comprehensive (loss)/income, net of tax:
Unrealized gains/(losses) on derivatives for cash flow hedges, net	1	5	21	(27)
Unrealized gains/(losses) on derivatives for net investment hedges, net	16	(30)	33	(27)
Foreign currency translation adjustments, net	(61)	147	9	46
Benefit plans: Actuarial loss, net	0	(1)	0	(1)
Other comprehensive income, net of tax	(44)	121	63	(9)
Comprehensive income before allocation to noncontrolling interests	508	600	1,684	1,269
Less: Comprehensive loss attributable to noncontrolling interests	0	0	(2)	(1)
Comprehensive income attributable to Zoetis Inc.	$ 508	$ 600	$ 1,686	$ 1,270