Segment and Other Revenue Information - Segment Income Narrative (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jul. 02, 2017		Jul. 03, 2016		Jul. 02, 2017	Jul. 03, 2016
Segment Reporting Information [Line Items]
Revenue		$ 1,269		$ 1,208		$ 2,500	$ 2,370
Provision	[1]					(3)
Exit costs		1		1		1	2
Certain legal and other matters, net		(4)		0		(4)
Zoetis Initiatives
Segment Reporting Information [Line Items]
Provision		(2)		(22)		(3)	(20)
Employee Termination Costs
Segment Reporting Information [Line Items]
Provision						(4)
Reconciling Items
Segment Reporting Information [Line Items]
Charges with changes in operating model		1		1		3	1
Certain legal and other matters, net						4
Stand-up costs				5			17
Reconciling Items | Zoetis Initiatives
Segment Reporting Information [Line Items]
Exit costs		1		1		1	2
Accelerated depreciation		1		2		2	3
Consulting fees		1	[2]	5	[2]	3	10	[2]
Net gain on sale of assets		(2)		(6)		(2)	27	[2]
Reconciling Items | Employee Termination Costs | Zoetis Initiatives
Segment Reporting Information [Line Items]
Provision		3		24		4	23
International | Operating Segments
Segment Reporting Information [Line Items]
Revenue	[3]	634		602		1,249	1,169
International | Operating Segments | Euro Member Countries, Euro
Segment Reporting Information [Line Items]
Revenue		$ 155		$ 158		$ 303	$ 312

[1] At July 2, 2017, and December 31, 2016, included in Accrued expenses ($29 million and $61 million, respectively) and Other noncurrent liabilities ($21 million and $29 million, respectively).

[2] For the three and six months ended July 2, 2017, represents the net loss related to sales of certain manufacturing sites and products as part of our operational efficiency initiative. For the three months ended July 3, 2016, primarily represents the net loss on the sale of our share of our Taiwan joint venture as part of our operational efficiency initiative. For the six months ended July 3, 2016, represents the net gain on the sale of certain manufacturing sites and products, partially offset by the loss on the sale of our share of our Taiwan joint venture, as part of our operational efficiency initiative.

[3] Revenue denominated in euros was $155 million and $303 million for the three and six months ended July 2, 2017, respectively, and $158 million and $312 million for the three and six months ended July 3, 2016, respectively.