Other (Income)/Deductions - Net (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty-related income		$ (2)	$ (5)	$ (4)	$ (6)
Interest income		(2)	(2)	(3)	(8)
Foreign currency loss	[1]	9	6	12	11
Other, net		2	0	4	(1)
Other (income)/deductions—net		10	5	12	(15)
Identifiable intangible asset impairment charges		0	3	0	3
Impairment of an equity investment		0	4	0	4
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]	$ 3	$ (1)	$ 3	$ (18)

[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 a cash payment received pursuant to an agreement related to the 2016 sale of certain U.S. manufacturing sites.