Other (Income)/Deductions - Net (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty-related income		$ (5)	$ (3)	$ (6)	$ (8)
Interest income		(2)	(9)	(8)	(19)
Identifiable intangible asset impairment charges		3	0	3	0
Foreign currency loss	[1]	6	7	11	7
Impairment of an equity investment		4	0	4	0
Other, net		0	(1)	(1)	0
Other (income)/deductions—net		5	(6)	(15)	(20)
Zoetis Initiatives
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (gain)/loss on sale of assets				(17)
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)	$ 0	$ (18)	$ 0

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

[2] For the six months ended June 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.