Segment Information Selected Statement of Income Narrative (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenue		$ 1,871	$ 1,534
Zoetis Initiatives
Segment Reporting Information [Line Items]
Net (gain)/loss on sale of assets			(17)
CEO Transition Costs
Segment Reporting Information [Line Items]
Restructuring and Other Cost Productivity Charges			4
International | Operating Segments
Segment Reporting Information [Line Items]
Revenue	[1]	922	728
International | Operating Segments | Euro Member Countries, Euro
Segment Reporting Information [Line Items]
Revenue		$ 192	$ 170

[1] Revenue denominated in euros was $192 million and $170 million for the three months ended March 31, 2021 and 2020, respectively.