Other (Income)/Deductions - Net (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty-related income		$ (3)	$ (4)	$ (9)	$ (12)
Interest income		(1)	(10)	(9)	(29)
Identifiable intangible asset impairment charges		0	0	3	0
Foreign currency loss	[1]	3	7	14	14
Impairment of an equity investment		0	0	4	0
Other, net		2	1	1	1
Other (income)/deductions—net		0	(26)	(15)	(46)
Zoetis Initiatives
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (gain)/loss on sale of assets			(20)	(18)
Reconciling Items | Zoetis Initiatives
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (gain)/loss on sale of assets	[2]	$ (1)	$ (20)	$ (19)	$ (20)

[1] Primarily driven by costs related to hedging and exposures to certain emerging and developed market currencies.

[2] For the nine months ended September 30, 2020, primarily represents a net gain resulting from net cash proceeds received pursuant to an agreement related to the 2016 sale of certain U.S. manufacturing sites.