Segment Information Selected Statement of Income Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021		Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 1,948	$ 1,548	$ 3,819		$ 3,082
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	5				9
International | Operating Segments
Segment Reporting Information [Line Items]
Revenue	924	708	1,846	[1]	1,436	[1]
International | Operating Segments | Euro Member Countries, Euro
Segment Reporting Information [Line Items]
Revenue	$ 209	$ 161	$ 401		$ 331

[1] Revenue denominated in euros was $401 million and $331 million for the six months ended June 30, 2021 and 2020, respectively.