Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016	Dec. 31, 2016
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount		$ 1,667		$ 1,667		$ 1,561
Finite-lived intangible assets, accumulated amortization		(706)		(706)		(648)
Finite-lived intangible assets, identifiable intangible assets, less accumulated amortization		961		961		913
Total indefinite-lived intangible assets		249		249		315
Intangible Assets, gross carrying amount		1,916		1,916		1,876
Identifiable intangible assets, less accumulated amortization		1,210		1,210		1,228
Amortization of intangible assets		24	$ 24	49	$ 48
Brands
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets		37		37		37
Trademarks and Trade Names
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets		67		67		66
In Process Research and Development
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets	[1]	137		137		204
Product Rights
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets		8		8		8
Developed Technology Rights
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	[1],[2]	1,167		1,167		1,064
Finite-lived intangible assets, accumulated amortization	[1],[2]	(385)		(385)		(342)
Finite-lived intangible assets, identifiable intangible assets, less accumulated amortization	[1],[2]	782		782		722
Brands
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount		213		213		213
Finite-lived intangible assets, accumulated amortization		(138)		(138)		(132)
Finite-lived intangible assets, identifiable intangible assets, less accumulated amortization		75		75		81
Trademarks and Trade Names
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount		62		62		62
Finite-lived intangible assets, accumulated amortization		(46)		(46)		(44)
Finite-lived intangible assets, identifiable intangible assets, less accumulated amortization		16		16		18
Other Intangible Assets
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount		225		225		222
Finite-lived intangible assets, accumulated amortization		(137)		(137)		(130)
Finite-lived intangible assets, identifiable intangible assets, less accumulated amortization		$ 88		$ 88		$ 92

[1] In the first quarter of 2017, certain intangible assets, acquired in 2015 as part of the Pharmaq acquisition, were placed into service.

[2] Includes the consolidation of a European livestock monitoring company, a variable interest entity of which Zoetis is the primary beneficiary, and intangible assets associated with the purchase of a Norwegian fish vaccination company, both during the first quarter of 2017.