Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	6 Months Ended
	Jul. 02, 2017 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 1,481
Additions	10	[1]
Other	4	[2]
Ending Balance	1,495
Guarulhos, Brazil [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations
Goodwill [Roll Forward]
Ending Balance	3
United States (U.S.)
Goodwill [Roll Forward]
Beginning Balance	661
Additions	5	[1]
Other	0	[2]
Ending Balance	666
International
Goodwill [Roll Forward]
Beginning Balance	820
Additions	5	[1]
Other	4	[2]
Ending Balance	$ 829

[1] Represents the consolidation of a European livestock monitoring company, a variable interest entity of which Zoetis is the primary beneficiary.

[2] Includes adjustments for foreign currency translation, partially offset by the reclassification of $3 million to Assets Held for Sale relating to our manufacturing site in Guarulhos, Brazil. For additional information, see Note 4. Acquisitions and Divestitures: Assets Held for Sale.