Segment Information - Income Statement Narrative (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues		$ 7,776	$ 6,675	$ 6,260
CHINA
Segment Reporting Information [Line Items]
Revenues		357	266	200
Zoetis Initiatives
Segment Reporting Information [Line Items]
Gain (loss) on disposal			18
Segment Reconciling Items | Zoetis Initiatives
Segment Reporting Information [Line Items]
Restructuring and Other Cost Productivity Charges		21		7
International Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues	[1]	3,652	3,035	2,972
International Segment | Euro Member Countries, Euro | Operating Segments
Segment Reporting Information [Line Items]
Revenues		$ 814	$ 718	$ 742

[1] Revenue denominated in euros was $814 million in 2021, $718 million in 2020 and $742 million in 2019.