CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Income Statement [Abstract]
Revenue		$ 1,269	$ 1,208	$ 2,500	$ 2,370
Costs and expenses:
Cost of Sales	[1]	440	399	883	788
Selling, general and administrative expenses	[1]	336	343	645	658
Research and development expenses	[1]	86	88	176	178
Amortization of intangible assets	[1]	23	22	45	43
Restructuring charges/(reversals) and certain acquisition-related costs		0	(21)	(1)	(19)
Interest expense, net of capitalized interest		41	41	82	84
Other (income)/deductions—net		(2)	4	(12)	(26)
Income before provision for taxes on income	[2]	345	332	682	664
Provision for taxes on income		98	108	196	236
Net income before allocation to noncontrolling interests		247	224	486	428
Less: Net income attributable to noncontrolling interests		0	0	1	0
Net income attributable to Zoetis Inc.		$ 247	$ 224	$ 485	$ 428
Earnings per share attributable to Zoetis Inc. stockholders:
Basic (in dollars per share)		$ 0.50	$ 0.45	$ 0.99	$ 0.86
Diluted (in dollars per share)		$ 0.50	$ 0.45	$ 0.98	$ 0.86
Weighted-average common shares outstanding:
Basic (in shares)		490.8	496.3	491.6	496.9
Diluted (in shares)		494.0	498.8	494.6	499.2
Dividends paid per common share (in dollars per share)		$ 0.105	$ 0.095	$ 0.21	$ 0.190

[1] Amortization expense related to finite-lived acquired intangible assets that contribute to our ability to sell, manufacture, research, market and distribute products, compounds and intellectual property is included in Amortization of intangible assets as these intangible assets benefit multiple business functions. Amortization expense related to finite-lived acquired intangible assets that are associated with a single function is included in Cost of sales, Selling, general and administrative expenses or Research and development expenses, as appropriate, in the condensed consolidated statements of income.

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