Segment and Other Revenue Information - Statement of Income Narrative (Details) - USD ($) $ in Millions		3 Months Ended
		Apr. 02, 2017	Apr. 03, 2016
Segment Reporting Information [Line Items]
Employee termination costs	[1]	$ (1)
Consulting fees			$ 5
Charges with changes in operating model		2
Gain (loss) recognized related to divestitures	[2]	0	33
Certain Significant Items
Segment Reporting Information [Line Items]
Stand-up costs			12
Zoetis Initiatives
Segment Reporting Information [Line Items]
Employee termination costs	[3]	(1)	2
Exit costs		1	1
Accelerated depreciation		1	1
Consulting fees		2
Employee Termination Costs | Zoetis Initiatives
Segment Reporting Information [Line Items]
Employee termination costs		(1)	1
Euro Member Countries, Euro
Segment Reporting Information [Line Items]
Revenues denominated in Euros		$ 148	$ 154

[1] Changes in our restructuring accruals represent employee termination costs.

[2] For the three months ended April 3, 2016, represents the net gain on the sale of certain manufacturing sites and products as part of our operational efficiency initiative.

[3] The restructuring charges/(reversals) for the three months ended April 2, 2017, are associated with the following: U.S. ($1 million) and International ($2 million reversal). The restructuring charges for the three months ended April 3, 2016, are associated with the following: U.S. ($1 million reversal), International ($1 million reversal) and Manufacturing/research/corporate ($4 million).