Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions			6 Months Ended
		Jul. 31, 2018	Jun. 30, 2019
Goodwill [Roll Forward]
Beginning Balance			$ 2,519
Other	[1]		(14)
Ending Balance			2,505
United States (U.S.)
Goodwill [Roll Forward]
Beginning Balance			1,265
Other	[1]		0
Ending Balance			1,265
International
Goodwill [Roll Forward]
Beginning Balance			1,254
Other	[1]		(14)
Ending Balance			$ 1,240
Abaxis Inc
Goodwill [Roll Forward]
Goodwill, Acquired During Period	[2]	$ 977

[1] Includes measurement period adjustments related to the acquisition of Abaxis and adjustments for foreign currency translation.

[2] Goodwill represents the excess of consideration transferred over the of fair values of the assets acquired and liabilities assumed. It is allocated to our existing reportable segments and is primarily attributable to the future potential of the technology platforms, as well as cost and revenue synergies including market share capture, elimination of cost redundancies and gain of cost efficiencies, and intangible assets such as assembled workforce which are not separately recognizable. The primary strategic purpose of the acquisition was to enhance the company’s existing product portfolio by strengthening Zoetis’ presence in veterinary diagnostics. The goodwill recorded is not deductible for tax purposes.