CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests	$ 558	$ 423
Other comprehensive income (loss), net of tax:
Unrealized gains/(losses) on derivatives for cash flow hedges, net	39	(28)
Unrealized gains on derivatives for net investment hedges, net	25	17
Foreign currency translation adjustments, net	33	(44)
Other comprehensive income, net of tax	97	(55)
Comprehensive income before allocation to noncontrolling interests	655	368
Less: Comprehensive loss attributable to noncontrolling interests	(1)	0
Comprehensive income attributable to Zoetis Inc.	$ 656	$ 368

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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