Segment Information Selected Statement of Income Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 1,990	$ 1,786	$ 5,809		$ 4,868
Zoetis Initiatives
Segment Reporting Information [Line Items]
Net (gain)/loss on sale of assets					(18)
CEO Transition Costs
Segment Reporting Information [Line Items]
Restructuring and Other Cost Productivity Charges		5			14
International | Operating Segments
Segment Reporting Information [Line Items]
Revenue	904	767	2,750	[1]	2,203	[1]
International | Operating Segments | Euro Member Countries, Euro
Segment Reporting Information [Line Items]
Revenue	$ 204	$ 186	$ 605		$ 517

[1] Revenue denominated in euros was $605 million and $517 million for the nine months ended September 30, 2021 and 2020, respectively.