Segment Information Selected Statement of Income Narrative (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Apr. 02, 2017
Segment Reporting Information [Line Items]
Revenue		$ 1,366	$ 1,231
Provision	[1]	1
Provision for losses on inventory		16	16
Cost of Goods and Services Sold		447	443
Nonoperating Income (Expense)		(5)	(10)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	[2]	417	337
Zoetis Initiatives
Segment Reporting Information [Line Items]
Provision		1	(1)
Operating Segments
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		756	663
Corporate
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		(153)	(143)
Reconciling Items
Segment Reporting Information [Line Items]
Other unallocated, Earnings		(78)	(83)
Acquisition-related costs		(1)	0
Purchase accounting adjustments, Earnings		(23)	(22)
Implementation of new accounting guidance		1
Charges with changes in operating model			2
Certain significant items, Earnings	[3]	(3)	(4)
Reconciling Items | Zoetis Initiatives
Segment Reporting Information [Line Items]
Accelerated depreciation			1
Consulting fees		1	2
Reconciling Items | Employee Termination Costs | Zoetis Initiatives
Segment Reporting Information [Line Items]
Provision		1	1
U.S.
Segment Reporting Information [Line Items]
Revenue		634	605
Provision			1
U.S. | Operating Segments
Segment Reporting Information [Line Items]
Revenue		634	605
Cost of Goods and Services Sold		140	137
Gross Profit		$ 494	$ 468
Gross margin, percentage		77.90%	77.40%
Operating Expenses		$ 96	$ 96
Nonoperating Income (Expense)		0	0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		398	372
International
Segment Reporting Information [Line Items]
Revenue			615
International | Operating Segments
Segment Reporting Information [Line Items]
Revenue	[4]	726	615
Cost of Goods and Services Sold		234	213
Gross Profit		$ 492	$ 402
Gross margin, percentage		67.80%	65.40%
Operating Expenses		$ 133	$ 114
Nonoperating Income (Expense)		1	(3)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		358	291
International | Operating Segments | Euro Member Countries, Euro
Segment Reporting Information [Line Items]
Revenue		184	148
Other business activities
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		$ (81)	$ (74)

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

[2] Defined as income before provision for taxes on income.

[3] For the three months ended March 31, 2018, Certain significant items primarily includes: (i) employee termination costs of $1 million, and consulting fees of $1 million, related to our supply network strategy, and (ii) a charge of $1 million related to the implementation of new accounting guidance as a result of the enactment of the Tax Act. For the three months ended April 2, 2017, Certain significant items primarily includes: (i) a $1 million reversal of previously accrued employee termination costs, accelerated depreciation charges of $1 million, and consulting fees of $2 million, related to our operational efficiency initiative and supply network strategy, and (ii) charges of $2 million associated with changes to our operating model.

[4] Revenue denominated in euros was $184 million and $148 million for the three months ended March 31, 2018, and April 2, 2017, respectively.