Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives (Details) $ in Millions		3 Months Ended
		Mar. 31, 2018 USD ($) employees	Apr. 02, 2017 USD ($)	Mar. 31, 2018 category	Mar. 31, 2018 product_category	Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Provision for losses on inventory		$ 16	$ 16
Total Restructuring charges/(reversals) and certain acquisition-related costs		2	(1)
Restructuring charges (reversals)	[1]	$ 1
Number of major product categories				5	300
Number of positions eliminated | employees		2,600
Total charges associated with the operational efficiency initiative and supply network strategy		$ 2	2
Restructuring Reserve [Roll Forward]
Restructuring accrual balance	[1],[2]	41
Provision	[1]	1
Utilization and other	[1],[3]	(7)
Restructuring accrual balance	[1],[2]	35
Other current liabilities
Restructuring Reserve [Roll Forward]
Accrued expenses		14				$ 19
Other Noncurrent Liabilities
Restructuring Reserve [Roll Forward]
Other noncurrent liabilities		21				$ 22
Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination costs/(reversals)	[4],[5]	1	(1)
Operational Efficiency
Restructuring Cost and Reserve [Line Items]
Restructuring charges (reversals)		0	(1)
Restructuring Reserve [Roll Forward]
Provision		0	(1)
Operational Efficiency | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination costs/(reversals)		0	1
Supply Network Strategy
Restructuring Cost and Reserve [Line Items]
Employee termination costs/(reversals)		(1)	0
Restructuring charges (reversals)		1	0
Accelerated depreciation		0	1
Other cost reduction and cost productivity charges		1	3
Consulting fees		1	2
Restructuring Reserve [Roll Forward]
Provision		1	0
Zoetis Initiatives
Restructuring Cost and Reserve [Line Items]
Restructuring charges (reversals)		1	(1)
Restructuring Reserve [Roll Forward]
Provision		$ 1	(1)
Maximum
Restructuring Cost and Reserve [Line Items]
Number of positions terminated | employees		2,800
International
Restructuring Cost and Reserve [Line Items]
Restructuring charges (reversals)			2
Restructuring Reserve [Roll Forward]
Provision			2
Manufacturing, Research, Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges (reversals)		$ 1
Restructuring Reserve [Roll Forward]
Provision		1
U.S.
Restructuring Cost and Reserve [Line Items]
Restructuring charges (reversals)			1
Restructuring Reserve [Roll Forward]
Provision			1
Direct Cost
Restructuring Cost and Reserve [Line Items]
Integration costs	[6]	$ 1	$ 0

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

[2] At March 31, 2018, and December 31, 2017, included in Accrued expenses ($14 million and $19 million, respectively) and Other noncurrent liabilities ($21 million and $22 million, respectively).

[3] Includes adjustments for foreign currency translation.

[4] The restructuring charges/(reversals) are associated with the following:•For the three months ended March 31, 2018, Manufacturing/research/corporate ($1 million). •For the three months ended April 2, 2017, U.S. ($1 million) and International ($2 million reversal)

[5] The restructuring charges/(reversals) for the three months ended March 31, 2018, primarily relate to the supply network strategy.The restructuring charges/(reversals) for the three months ended April 2, 2017, primarily relate to the operational efficiency initiative

[6] Integration costs represent external, incremental costs directly related to integrating acquired businesses and primarily include expenditures for consulting and the integration of systems and processes, as well as product transfer costs.