10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
	EXCHANGE ACT OF 1934
	For the quarterly period ended March 31, 2018
	or
	TRANSITION REPORT PURSUANT TO SECTION 13
	OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
¨	For the transition period from __________ to __________

Commission File Number: 001-35797

Zoetis Inc.

(Exact name of registrant as specified in its charter)

Delaware	46-0696167
(State or other jurisdiction of	(I.R.S. Employer Identification No.)
incorporation or organization)
10 Sylvan Way, Parsippany, New Jersey	07054
(Address of principal executive offices)	(Zip Code)

(973) 822-7000

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities and Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. x Yes ¨ No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). x Yes ¨ No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, non-accelerated filer, smaller reporting company or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer x Accelerated filer ¨ Non-accelerated filer ¨ Smaller reporting company ¨ Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in rule 12b-2 of the Exchange Act). ¨ Yes x No

At April 27, 2018, there were 483,865,442 shares of common stock outstanding.

TABLE OF CONTENTS

		Page
PART I — FINANCIAL INFORMATION		1
Item 1.	Financial Statements	1
	Condensed Consolidated Statements of Income (Unaudited)	1
	Condensed Consolidated Statements of Comprehensive Income (Unaudited)	2
	Condensed Consolidated Balance Sheets (Unaudited)	3
	Condensed Consolidated Statements of Equity (Unaudited)	4
	Condensed Consolidated Statements of Cash Flows (Unaudited)	5
	Notes to Condensed Consolidated Financial Statements (Unaudited)	6
	Review Report of Independent Registered Public Accounting Firm	23
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	24
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	42
Item 4.	Controls and Procedures	42
PART II — OTHER INFORMATION		43
Item 1.	Legal Proceedings	43
Item 1A.	Risk Factors	43
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	44
Item 3.	Defaults Upon Senior Securities	44
Item 4.	Mine Safety Disclosures	44
Item 5.	Other Information	44
Item 6.	Exhibits	44
SIGNATURES		45

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements

ZOETIS INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)	2018			2017
Revenue	$	1,366		$	1,231
Costs and expenses:
Cost of sales	447			443
Selling, general and administrative expenses	338			309
Research and development expenses	97			90
Amortization of intangible assets	23			22
Restructuring charges/(reversals) and certain acquisition-related costs	2			(1		)
Interest expense, net of capitalized interest	47			41
Other (income)/deductions—net	(5		)	(10		)
Income before provision for taxes on income	417			337
Provision for taxes on income	67			98
Net income before allocation to noncontrolling interests	350			239
Less: Net (loss)/income attributable to noncontrolling interests	(2		)	1
Net income attributable to Zoetis Inc.	$	352		$	238
Earnings per share attributable to Zoetis Inc. stockholders:
Basic	$	0.72		$	0.48
Diluted	$	0.72		$	0.48
Weighted-average common shares outstanding:
Basic	485.9			492.4
Diluted	489.8			495.3
Dividends declared per common share	$	0.126		$	0.105

See notes to condensed consolidated financial statements.

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ZOETIS INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(UNAUDITED)

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS)	2018			2017
Net income before allocation to noncontrolling interests	$	350		$	239
Other comprehensive income, net of taxes and reclassification adjustments:
Foreign currency translation adjustments, net	77			44
Benefit plans: Actuarial gains, net(a)	—			2
Total other comprehensive income, net of tax	77			46
Comprehensive income before allocation to noncontrolling interests	427			285
Less: Comprehensive (loss)/income attributable to noncontrolling interests	(1		)	1
Comprehensive income attributable to Zoetis Inc.	$	428		$	284

^(a)  Presented net of reclassification adjustments and tax impacts, which are not significant in any period presented. Reclassification adjustments related to benefit plans are generally reclassified, as part of net periodic pension cost, into Other (income)/deductions,beginning in the first quarter of 2018, and into Cost of sales, Selling, general and administrative expenses, and/or Research and development expenses, as appropriate, for periods prior to 2018, in the condensed consolidated statements of income.

See notes to condensed consolidated financial statements.

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ZOETIS INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

	March 31,			December 31,
	2018			2017
(MILLIONS OF DOLLARS, EXCEPT SHARE AND PER SHARE DATA)	(Unaudited)
Assets
Cash and cash equivalents(a)	$	1,654		$	1,564
Accounts receivable, less allowance for doubtful accounts of $25 in 2018 and $25 in 2017	943			998
Inventories	1,441			1,427
Other current assets	229			228
Total current assets	4,267			4,217
Property, plant and equipment, less accumulated depreciation of $1,519 in 2018 and $1,471 in 2017	1,453			1,435
Goodwill	1,532			1,510
Identifiable intangible assets, less accumulated amortization	1,280			1,269
Noncurrent deferred tax assets	80			80
Other noncurrent assets	78			75
Total assets	$	8,690		$	8,586
Liabilities and Equity
Accounts payable	$	217		$	261
Dividends payable	61			61
Accrued expenses	419			432
Accrued compensation and related items	182			236
Income taxes payable	92			60
Other current liabilities	29			44
Total current liabilities	1,000			1,094
Long-term debt, net of discount and issuance costs	4,954			4,953
Noncurrent deferred tax liabilities	246			380
Other taxes payable	304			172
Other noncurrent liabilities	211			201
Total liabilities	6,715			6,800
Commitments and contingencies (Note 15)
Stockholders' equity:
Preferred stock, $0.01 par value: 1,000,000,000 authorized, none issued	—			—
Common stock, $0.01 par value: 6,000,000,000 authorized; 501,891,243 and 501,891,243 shares issued; 484,724,245 and 486,130,461 shares outstanding at March 31, 2018, and December 31, 2017, respectively	5			5
Treasury stock, at cost, 17,166,998 and 15,760,782 shares of common stock at March 31, 2018, and December 31, 2017, respectively	(1,005		)	(852		)
Additional paid-in capital	990			1,013
Retained earnings	2,399			2,109
Accumulated other comprehensive loss	(429		)	(505		)
Total Zoetis Inc. equity	1,960			1,770
Equity attributable to noncontrolling interests	15			16
Total equity	1,975			1,786
Total liabilities and equity	$	8,690		$	8,586

^(a)  As of both March 31, 2018, and December 31, 2017, includes $6 million of restricted cash.

See notes to condensed consolidated financial statements.

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ZOETIS INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

(UNAUDITED)

	Zoetis
													Accumulated			Equity
							Additional						Other			Attributable to
		Common		Treasury			Paid-in			Retained			Comprehensive			Noncontrolling			Total
(MILLIONS OF DOLLARS)		Stock(a)		Stock(a)			Capital			Earnings			Loss			Interests			Equity
Balance, December 31, 2016		$	5	$	(421	)	$	1,024		$	1,477		$	(598	)	$	12		$	1,499
Three months ended April 2, 2017
Net income		—		—			—			238			—			1			239
Other comprehensive income		—		—			—			—			46			—			46
Consolidation of a noncontrolling interest(b)		—		—			—			—			—			13			13
Share-based compensation awards(c)		—		36			(10		)	(12		)	—			—			14
Treasury stock acquired(d)		—		(125		)	—			—			—			—			(125		)
Employee benefit plan contribution from Pfizer Inc.(e)		—		—			1			—			—			—			1
Dividends declared		—		—			—			(52		)	—			—			(52		)
Balance, April 2, 2017		$	5	$	(510	)	$	1,015		$	1,651		$	(552	)	$	26		$	1,635
Balance, December 31, 2017		$	5	$	(852	)	$	1,013		$	2,109		$	(505	)	$	16		$	1,786
Three months ended March 31, 2018
Net income/(loss)		—		—			—			352			—			(2		)	350
Other comprehensive income		—		—			—			—			76			1			77
Share-based compensation awards (c)		—		37			(24		)	(1		)	—			—			12
Treasury stock acquired(d)		—		(190		)	—			—			—			—			(190		)
Employee benefit plan contribution from Pfizer Inc.(e)		—		—			1			—			—			—			1
Dividends declared		—		—			—			(61		)	—			—			(61		)
Balance, March 31, 2018		$	5	$	(1,005	)	$	990		$	2,399		$	(429	)	$	15		$	1,975

^(a)  As of March 31, 2018, and April 2, 2017, there were 484,724,245 and 491,328,479 outstanding shares of common stock, respectively, and 17,166,998 and 10,562,764 shares of treasury stock, respectively. Treasury stock is recognized at the cost to reacquire the shares. For additional information, see Note 13. Stockholders' Equity.

^(b)  Represents the consolidation of a European livestock monitoring company, a variable interest entity of which Zoetis is the primary beneficiary.

^(c) Includes the issuance of shares of Zoetis Inc. common stock and the reissuance of treasury stock in connection with the vesting of employee share-based awards. Upon reissuance of treasury stock, differences between the proceeds from reissuance and the cost of the treasury stock that result in gains are recorded in Additional paid-in capital. Losses are recorded in Additional paid-in capital to the extent that they can offset previously recorded gains. If no such credit exists, the differences are recorded in Retained earnings. Also includes the reacquisition of shares of treasury stock associated with the vesting of employee share-based awards to satisfy tax withholding requirements. For additional information, see Note 12. Share-Based Payments and Note 13. Stockholders' Equity.

^(d)  Reflects the acquisition of treasury shares in connection with the share repurchase program. For additional information, see Note 13. Stockholders' Equity.

^(e)  Represents contributed capital from Pfizer Inc. associated with service credit continuation for certain Zoetis Inc. employees in Pfizer Inc.'s U.S. qualified defined benefit and U.S. retiree medical plans. See Note 11. Benefit Plans.

See notes to condensed consolidated financial statements.

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ZOETIS INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS)	2018			2017
Operating Activities
Net income before allocation to noncontrolling interests	$	350		$	239
Adjustments to reconcile net income before noncontrolling interests to net cash provided by operating activities:
Depreciation and amortization expense	60			62
Share-based compensation expense	11			11
Restructuring	2			(1		)
Asset write-offs and asset impairments	2			—
Provision for losses on inventory	16			16
Deferred taxes(a)	(141		)	24
Employee benefit plan contribution from Pfizer Inc.	1			1
Other non-cash adjustments	3			4
Other changes in assets and liabilities, net of acquisitions and divestitures
Accounts receivable	60			(22		)
Inventories	(33		)	(52		)
Other assets	(2		)	(13		)
Accounts payable	(46		)	(37		)
Other liabilities	(57		)	(147		)
Other tax accounts, net(a)	163			34
Net cash provided by operating activities	389			119
Investing Activities
Purchases of property, plant and equipment	(53		)	(42		)
Acquisitions	—			(3		)
Net proceeds from sales of assets	8			—
Other investing activities	—			(3		)
Net cash used in investing activities	(45		)	(48		)
Financing Activities
Payment of contingent consideration related to previously acquired assets	(12		)	(5		)
Share-based compensation-related proceeds, net of taxes paid on withholding shares	2			6
Purchases of treasury stock	(190		)	(125		)
Cash dividends paid	(62		)	(52		)
Net cash used in financing activities	(262		)	(176		)
Effect of exchange-rate changes on cash and cash equivalents	8			7
Net increase/(decrease) in cash and cash equivalents	90			(98		)
Cash and cash equivalents at beginning of period	1,564			727
Cash and cash equivalents at end of period	$	1,654		$	629
Supplemental cash flow information
Cash paid during the period for:
Income taxes	$	42		$	37
Interest, net of capitalized interest	70			56
Non-cash transactions:
Purchases of property, plant and equipment	1			4
Contingent purchase price consideration(b)	—			2
Dividends declared, not paid	61			52

^(a)  Reflects the reclassification of the one-time mandatory deemed repatriation tax from Noncurrent deferred tax liabilities to Income taxes payable and Other taxes payable to properly reflect the liability, which became a fixed obligation in 2018 payable over eight years.

^(b)  For 2017, relates primarily to the consolidation of a European livestock monitoring company a variable interest entity of which Zoetis is the primary beneficiary.

See notes to condensed consolidated financial statements.

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ZOETIS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1. Organization

Zoetis Inc. (including its subsidiaries, collectively, Zoetis, the company, we, us or our) is a global leader in the discovery, development, manufacture and commercialization of animal health medicines and vaccines, with a focus on both livestock and companion animals. We organize and operate our business in two geographic regions: the United States (U.S.) and International.

We directly market our products in approximately 45 countries across North America, Europe, Africa, Asia, Australia and South America. Our products are sold in more than 100 countries, including developed markets and emerging markets. We have a diversified business, marketing products across eight core species: cattle, swine, poultry, sheep and fish (collectively, livestock) and dogs, cats and horses (collectively, companion animals); and within five major product categories: anti-infectives, vaccines, parasiticides, medicated feed additives and other pharmaceuticals.

2. Basis of Presentation

The accompanying unaudited condensed consolidated financial statements were prepared following the requirements of the Securities and Exchange Commission (SEC) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by accounting principles generally accepted in the United States of America (U.S. GAAP) can be condensed or omitted. Balance sheet amounts and operating results for subsidiaries operating outside the United States are as of and for the three-month periods ended February 28, 2018, and February 26, 2017.

Prior to fiscal 2018, the company followed a 13-week quarterly accounting cycle for each of the first three fiscal quarters. The company's fiscal year ends on December 31 for our operations in the United States and on November 30 for subsidiaries operating outside the United States. Beginning in fiscal 2018, the company's first three fiscal quarters will end on the last day of March, June and September in the United States and the last day of February, May and August for subsidiaries operating outside the United States. There is no change to the company's fiscal year-end dates. We did not adjust our results of operations for periods prior to 2018 as the impact was not material.

Revenue, expenses, assets and liabilities can vary during each quarter of the year. Therefore, the results and trends in these interim financial statements may not be representative of those for the full year.

We are responsible for the unaudited condensed consolidated financial statements included in this Form 10-Q. The condensed consolidated financial statements include all normal and recurring adjustments that are considered necessary for the fair presentation of our financial position and operating results. The information included in this interim report should be read in conjunction with the financial statements and accompanying notes included in our 2017 Annual Report on Form 10-K.

3. Accounting Standards

Recently Adopted Accounting Standards

In March 2018, the Financial Accounting Standards Board (FASB) issued an accounting standards update to align existing guidance on accounting for income taxes, pursuant to guidance provided by a Staff Accounting Bulletin published by the SEC on December 22, 2017. The update addresses the challenges in accounting for the effects of the Tax Cuts and Jobs Act (the Tax Act), enacted on December 22, 2017, in the period of enactment and required companies to report provisional amounts for those specific income tax effects of the Tax Act for which the accounting is incomplete but a reasonable estimate can be determined. Provisional amounts will be subject to adjustment during a measurement period of up to one year from the enactment date. For additional information, see Note 7. Tax Matters.

In March 2017, the FASB issued an accounting standards update to simplify and improve the reporting of net periodic pension benefit cost by requiring only present service cost to be presented in the same line item as other current employee compensation costs while remaining components of net periodic benefit cost would be presented within Other (income)/deductions—net outside of operations. We adopted this guidance as of January 1, 2018, the required effective date. The new standard did not have a significant impact on our consolidated financial statements.

In October 2016, the FASB issued an accounting standards update that requires the recognition of the income tax consequences of an intra-entity asset transfer, other than inventory, when the transfer occurs as opposed to when the asset is sold to an outside third party. We adopted this guidance as of January 1, 2018, the required effective date. The new standard did not have a significant impact on our consolidated financial statements.

In May 2014, the FASB issued an accounting standards update that outlines a new, single comprehensive model for companies to use in accounting for revenue arising from contracts with customers. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. We adopted this guidance as of January 1, 2018, the required effective date, using the modified retrospective adoption method. Prior period amounts have not been adjusted and continue to be reported in accordance with our historic

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accounting policies. Application of the standard using the modified retrospective method did not require an adjustment to opening retained earnings. For additional information, see Note 4. Revenue.

Recently Issued Accounting Standards

In February 2018, the FASB issued an accounting standards update which permits companies to reclassify from accumulated other comprehensive income to retained earnings stranded tax effects resulting from the new federal corporate income tax rate. In the period of adoption, a company may choose to either apply the amendments retrospectively to each period in which the effect of the change in federal income tax rate is recognized or to apply the amendments in that reporting period. The provisions of the update are effective beginning January 1, 2019 for interim and annual periods, with early adoption permitted for any interim period after issuance of the update. We are currently assessing the timing of our adoption and do not expect that the new standard will have a significant impact on our consolidated financial statements.

In August 2017, the FASB issued an accounting standards update which amends the hedge accounting recognition and presentation requirements and allows for more hedging strategies to be eligible for hedge accounting. Recognition of periodic hedge effectiveness will no longer be required for cash flow and net investment hedges and companies may elect to perform subsequent hedge effectiveness assessments qualitatively. The update also clarifies that the change in fair value of a derivative must be recorded in the same income statement line item as the earnings effect of the hedged item and introduces additional disclosure requirements including cumulative basis adjustments for fair value hedges and the effect of hedging on individual income statement line items. The provisions of the update are effective beginning January 1, 2019 for interim and annual periods with early adoption permitted for any interim period after issuance of the update. We are currently assessing the timing of our adoption as well as the potential impact that the standard will have on our consolidated financial statements.

In February 2016, the FASB issued an accounting standards update which requires lessees to recognize most leases on the balance sheet with a corresponding right of use asset. Leases will be classified as financing or operating which will drive the expense recognition pattern. For lessees, the income statement presentation and expense recognition pattern for financing and operating leases is similar to the current model for capital and operating leases, respectively. Companies may elect to exclude short-term leases. The update also requires additional disclosures that will better enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. We plan to adopt this guidance as of January 1, 2019, the required effective date, for annual and interim reporting periods. The new standard requires a modified retrospective adoption approach, at the beginning of the earliest comparative period presented in the financial statements. We have selected a lease accounting system and are currently evaluating our lease contracts, accounting policy elections, and the impact of adoption on our consolidated financial statements. While we do not expect adoption of the standard to have a significant impact on our consolidated statements of income, the impact on the assets and liabilities within our consolidated balance sheet may be material.

4. Revenue

A. Revenue from Product Sales

We offer a diversified portfolio of products which allows us to capitalize on local and regional customer needs. Generally, our products are promoted to veterinarians and livestock producers by our sales organization which includes sales representatives and technical and veterinary operations specialists, and then sold directly by us or through distributors. The depth of our product portfolio enables us to address the varying needs of customers in different species and geographies. Many of our top selling product lines are distributed across both of our operating segments, leveraging our R&D operations and manufacturing and supply chain network.

Over the course of our history, we have focused on developing a diverse portfolio of animal health products, including medicines and vaccines, complemented by biodevices, diagnostics, and genetics. We refer to a single product in all brands, or its dosage forms for all species, as a product line. We have approximately 300 comprehensive product lines, including products for both livestock and companion animals across each of our major product categories.

Our major product categories are:

• vaccines: biological preparations that help prevent diseases of the respiratory, gastrointestinal and reproductive tracts or induce a specific immune response;

• anti-infectives: products that prevent, kill or slow the growth of bacteria, fungi or protozoa;

• other pharmaceutical products: allergy and dermatology, pain and sedation, antiemetic, reproductive, and oncology products;

• parasiticides: products that prevent or eliminate external and internal parasites such as fleas, ticks and worms; and

• medicated feed additives: products added to animal feed that provide medicines to livestock.

Our livestock products primarily help prevent or treat diseases and conditions to enable the cost-effective production of safe, high-quality animal protein. Human population growth and increasing standards of living are important long-term growth drivers for our livestock products in three major ways. First, population growth and increasing standards of living drive increased demand for improved nutrition, particularly animal protein. Second, population growth leads to increased natural resource constraints driving a need for enhanced productivity. Finally, as standards of living improve, there is increased focus on food quality and safety.

Our companion animal products help extend and improve the quality of life for pets; increase convenience and compliance for pet owners; and help veterinarians improve the quality of their care and the efficiency of their businesses. Growth in the companion animal medicines and vaccines sector is driven by economic development, related increases in disposable income and increases in pet ownership and spending on pet care. Companion animals are also living longer, receiving increased medical treatment and benefiting from advances in animal health medicines and vaccines.

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The following tables present our revenue disaggregated by geographic area, species, and major product category.

Revenue by geographic area

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
United States	$	634	$	605
Australia	48		40
Brazil	70		66
Canada	40		34
China	64		52
France	33		29
Germany	38		28
Italy	27		22
Japan	41		34
Mexico	24		18
Spain	25		20
United Kingdom	52		43
Other developed markets	79		68
Other emerging markets	185		161
	1,360		1,220
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

Revenue by major species

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
U.S.
Livestock	$	292	$	282
Companion Animal	342		323
	634		605
International
Livestock	478		421
Companion Animal	248		194
	726		615
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

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Revenue by species

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Livestock:
Cattle	$	416	$	386
Swine	175		160
Poultry	136		116
Fish	22		21
Other	21		20
	770		703
Companion Animal:
Dogs and Cats	549		482
Horses	41		35
	590		517
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

Revenue by major product category

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Vaccines	$	356	$	319
Anti-infectives	297		268
Other pharmaceuticals	319		272
Parasiticides	191		184
Medicated feed additives	137		123
Other non-pharmaceuticals	60		54
	1,360		1,220
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

B.    Revenue Accounting Policy

Below are the significant accounting policies updated as of January 1, 2018 as a result of the adoption of the new revenue recognition guidance. For additional information, see Note 3. Accounting Standards.

We recognize revenue from product sales when control of the goods has transferred to the customer, which is typically once the goods have shipped and the customer has assumed title.Revenue reflects the total consideration to which we expect to be entitled (i.e. the transaction price), in exchange for products sold, after considering various types of variable consideration including rebates, sales allowances, product returns and discounts.

Variable consideration is estimated and recorded at the time that related revenue is recognized. Our estimates reflect the amount by which we expect variable consideration to impact revenue recognized and are generally based on contractual terms or historical experience, adjusted as necessary to reflect our expectations about the future. Our customer payment terms generally range from 60 to 90 days.

Estimates of variable consideration utilize a complex series of judgments and assumptions to determine the amount by which we expect revenue to be reduced, for example;

• for sales returns, we perform calculations in each market that incorporate the following, as appropriate: local returns policies and practices; historic returns as a percentage of revenue; estimated shelf life by product; an estimate of the amount of time between shipment and return or lag time; and any other factors that could impact the estimate of future returns, product recalls, discontinuation of products or a changing competitive environment; and

• for revenue incentives, we use our historical experience with similar incentives programs to estimate the impact of such programs on revenue for the current period.

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Although the amounts recorded for these revenue deductions are dependent on estimates and assumptions, historically our adjustments to actual results have not been material. The sensitivity of our estimates can vary by program, type of customer and geographic location.

A deferral of revenue may be required in the event that we have not satisfied all customer obligations for which we have been compensated. The transaction price is allocated to the individual performance obligations on the basis of relative stand-alone selling price, which is typically based on actual sales prices. Revenue associated with unsatisfied performance obligations are contract liabilities, is recorded within Other current liabilities, and is recognized once control of the underlying products has transferred to the customer. Contract liabilities reflected within Other current liabilities as of the adoption date and subsequently recognized as revenue during the first quarter of 2018 were approximately $2 million. Contract liabilities as of March 31, 2018 were approximately $4 million.

We do not disclose the transaction price allocated to unsatisfied performance obligations related to contracts with an original expected duration of one year or less, or for contracts for which we recognize revenue in line with our right to invoice the customer. Estimated future revenue expected to be generated from long-term contracts with unsatisfied performance obligations as of March 31, 2018 are not material.

Taxes collected from customers relating to product sales and remitted to governmental authorities are excluded from Revenue. Shipping and handling costs incurred after control of the purchased product has transferred to the customer are accounted for as a fulfillment cost, within Selling, general and administrative expenses.

5. Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives

In connection with our cost-reduction/productivity initiatives, we typically incur costs and charges associated with site closings and other facility rationalization actions, workforce reductions and the expansion of shared services, including the development of global systems. In connection with our acquisition activity, we typically incur costs and charges associated with executing the transactions, integrating the acquired operations, which may include expenditures for consulting and the integration of systems and processes, product transfers and restructuring the consolidated company, which may include charges related to employees, assets and activities that will not continue in the consolidated company. All operating functions can be impacted by these actions, including sales and marketing, manufacturing and research and development (R&D), as well as functions such as business technology, shared services and corporate operations.

During 2015, we launched a comprehensive operational efficiency program, which was incremental to the previously announced supply network strategy. These initiatives focused on reducing complexity in our product portfolios, changing our selling approach in certain markets, reducing our presence in certain countries, and exiting manufacturing sites over a long term period. We have also continued to optimize our resource allocation and efficiency by reducing resources associated with non-customer facing activities and operating more efficiently as a result of less internal complexity and more standardization of processes. As part of these initiatives, we planned to reduce certain positions through divestitures, normal attrition and involuntary terminations by approximately 2,800, subject to consultations with works councils and unions in certain countries. Including divestitures, as of March 31, 2018, approximately 2,600 positions have been eliminated related to these initiatives. The comprehensive operational efficiency program was substantially completed as of December 31, 2017. We expect to complete the supply network strategy over the next several years.

The components of costs incurred in connection with restructuring initiatives, acquisitions and cost-reduction/productivity initiatives are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Restructuring charges/(reversals) and certain acquisition-related costs:
Integration costs(a)	$	1	$	—
Restructuring charges/(reversals)(b)(c):
Employee termination costs/(reversals)	1		(1		)
Total Restructuring charges/(reversals) and certain acquisition-related costs	$	2	$	(1	)

^(a)  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.

^(b)  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.

^(c)  The restructuring charges/(reversals) are associated with the following:

• For the three months endedMarch 31, 2018, Manufacturing/research/corporate ($1 million).

• For the three months endedApril 2, 2017, U.S. ($1 million) and International ($2 million reversal).

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Charges related to the operational efficiency initiative and supply network strategy are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Restructuring charges/(reversals) and certain acquisition-related costs:
Operational efficiency initiative
Employee termination costs	$	—	$	(1	)
	—		(1		)
Supply network strategy:
Employee termination costs	1		—
	1		—
Total restructuring charges/(reversals) related to the operational efficiency initiative and supply network strategy	1		(1		)
Other supply network strategy charges
Cost of sales:
Accelerated depreciation	—		1
Consulting fees	1		2
Total other supply network strategy charges	1		3
Total charges associated with the operational efficiency initiative and supply network strategy	$	2	$	2

The components of, and changes in, our restructuring accruals are as follows:

(MILLIONS OF DOLLARS)	Accrual(a)
Balance, December 31, 2017(b)	$	41
Provision	1
Utilization and other(c)	(7		)
Balance, March 31, 2018(b)	$	35

^(a)   Changes in our restructuring accruals represent employee termination costs.

^(b)  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).

^(c)   Includes adjustments for foreign currency translation.

6. Other (Income)/Deductions—Net

The components of Other (income)/deductions—net are as follows:

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS)	2018			2017
Royalty-related income	$	(7	)	$	(7	)
Foreign currency loss(a)	8			2
Other, net(b)	(6		)	(5		)
Other (income)/deductions—net	$	(5	)	$	(10	)

^(a)  Primarily driven by costs related to hedging and exposures to certain emerging market currencies.

^(b)  For the three months endedMarch 31, 2018, primarily includes interest income and other miscellaneous income. For the three months endedApril 2, 2017, primarily includes a settlement refund and reimbursement of legal fees related to costs incurred by Pharmaq prior to the acquisition in 2015, as well as interest income and other miscellaneous income.

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7. Income Taxes

A. Taxes on Income

On December 22, 2017, the Tax Act was enacted which, among other changes, reduced the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018. The Tax Act made broad and complex changes to the U.S. tax code and it will take time to fully analyze the impact of the changes. Based on the information available at that time, and the current interpretation of the Tax Act, for the year ended December 31, 2017 the company was able to make a reasonable estimate and recorded an initial provisional net tax expense of $212 million related to the one-time mandatory deemed repatriation tax, payable over eight years, partially offset by the remeasurement of the deferred tax assets and liabilities, as of the date of enactment, due to the reduction in the U.S. federal corporate tax rate. Pursuant to the Staff Accounting Bulletin published by the SEC on December 22, 2017, addressing the challenges in accounting for the effects of the Tax Act in the period of enactment, companies must report provisional amounts for those specific income tax effects of the Tax Act for which the accounting is incomplete but a reasonable estimate can be determined. Those provisional amounts will be subject to adjustment during a measurement period of up to one year from the enactment date (measurement-period adjustment). Pursuant to this guidance, the estimated impact of the Tax Act was based on a preliminary review of the new tax law and projected future financial results and is subject to revision based upon further analysis and interpretation of the Tax Act and to the extent that future results differ from currently available projections.

Our accounting for the following elements of the Tax Act is incomplete. However, we were able to further refine our initial reasonable estimate and adjusted the initial provisional net tax expense of $212 million and recorded the following measurement-period adjustments during the first quarter of 2018:

• One-Time Mandatory Deemed Repatriation Tax: The one-time mandatory deemed repatriation tax is a tax on certain previously untaxed accumulated and current earnings and profits (E&P) of our foreign subsidiaries. We were able to reasonably estimate the one-time mandatory deemed repatriation tax and recorded an initial provisional tax obligation, with a corresponding adjustment to income tax expense for the year ended December 31, 2017. We are continuing to gather additional information to more precisely compute the amount of the one-time mandatory deemed repatriation tax, and our accounting for this item is not yet complete due to the fact that the non-U.S. subsidiaries are on a fiscal year ending November 30, and this tax liability will not become a fixed obligation until November 30, 2018. The estimated impact of the Tax Act is based on a preliminary review of the new law and projected future financial results and is subject to revision based upon further analysis and interpretation of the Tax Act and to the extent that future results differ from currently available projections. However, on the basis of revised E&P computations that were calculated during the reporting period, we recognized a measurement-period adjustment of $2 million as a decrease to the one-time mandatory deemed repatriation tax obligation, with a corresponding adjustment to income tax benefit during the period. The effect of the measurement-period adjustment to the first quarter 2018 effective tax rate was a reduction to the rate of approximately 0.6%. In addition, we reclassified the one-time mandatory deemed repatriation tax from Noncurrent deferred tax liabilities to Income taxes payable and Other taxes payable. We expect to complete our accounting within the prescribed measurement period.

• Reduction of U.S. Federal Corporate Tax Rate: The Tax Act reduced the corporate tax rate to 21%, effective January 1, 2018. Consequently, we recorded a decrease related to deferred tax assets and liabilities with a corresponding net adjustment to deferred income tax benefit for the year ended December 31, 2017. We have not made any measurement-period adjustments related to this item during the first quarter of 2018. Since the company has recorded provisional amounts related to certain portions of the Tax Act, any corresponding deferred tax remeasurement is also provisional. However, we are continuing to gather additional information to complete our accounting for this item and expect to be completed within the prescribed measurement period.

• Valuation Allowances: The company must assess whether its valuation allowance analyses are affected by the various aspects of the Tax Act (e.g., one-time mandatory deemed repatriation of deferred foreign income, global intangible low-taxed income inclusions, and new categories of foreign tax credits). We have not made any measurement-period adjustments related to this item during the first quarter of 2018. Since the company has recorded provisional amounts related to certain portions of the Tax Act, any corresponding determination of the need for or change in a valuation allowance is also provisional. However, we are continuing to gather additional information to complete our accounting for this item and expect to be completed within the prescribed measurement period.

• Global Intangible Low-Taxed Income (GILTI) Policy Election: The GILTI provisions of the Tax Act do not apply to the company until 2019, due to the fact that the non-U.S. subsidiaries are on a fiscal year ending November 30, and we are still evaluating its impact. The FASB allows companies to adopt an accounting policy to either recognize deferred taxes for GILTI or treat such tax cost as a current-period expense when incurred. We have not yet determined our accounting policy because determining the impact of the GILTI provisions requires analysis of our existing legal entity structure, the reversal of our U.S. GAAP and U.S. tax basis differences in the assets and liabilities of our foreign subsidiaries, and our ability to offset any tax with foreign tax credits. As such, we have not made a policy decision whether to record deferred taxes on GILTI or treat such tax cost as a current-period expense.

The effective tax rate was 16.1% for the three months ended March 31, 2018, compared with 29.1% for the three months ended April 2, 2017. The lower effective tax rate for the three months ended March 31, 2018, was primarily attributable to:

• the reduction of the U.S. federal corporate income tax rate from 35% to 21%, effective January 1, 2018, pursuant to the Tax Act;

• changes in the jurisdictional mix of earnings, which includes the impact of the location of earnings from operations and repatriation costs. The jurisdictional mix of earnings can vary as a result of repatriation decisions and operating fluctuations in the normal course of business and the impact of non-deductible items;

• an $8 million and $5 million discrete tax benefit recorded in the first quarter of 2018 and 2017, respectively, related to the excess tax benefits for share-based payments;

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• an $8 million and $3 million discrete tax benefit recorded in the first quarter of 2018 and 2017, respectively, related to a remeasurement of deferred taxes as a result of a change in non-U.S. statutory tax rates; and

• a $2 million net discrete tax benefit recorded in the first quarter of 2018, associated with a measurement-period adjustment related to the provisional one-time mandatory deemed repatriation tax on the company's undistributed non-U.S. earnings pursuant to the Tax Act enacted on December 22, 2017.

B. Deferred Taxes

As of March 31, 2018, the total net deferred income tax liability of $166 million is included in Noncurrent deferred tax assets ($80 million) and Noncurrent deferred tax liabilities ($246 million).

As of December 31, 2017, the total net deferred income tax liability of $300 million is included in Noncurrent deferred tax assets ($80 million) and Noncurrent deferred tax liabilities ($380 million).

The change in Noncurrent deferred tax liabilities was primarily due to the reclassification of the one-time mandatory deemed repatriation tax from Noncurrent deferred tax liabilities to Income taxes payable and Other taxes payable to properly reflect the liability, which became a fixed obligation in 2018 payable over eight years.

C. Tax Contingencies

As of March 31, 2018, the tax liabilities associated with uncertain tax positions of $191 million (exclusive of interest and penalties related to uncertain tax positions of $12 million) are included in Noncurrent deferred tax assets ($4 million) and Other taxes payable ($187 million).

As of December 31, 2017, the tax liabilities associated with uncertain tax positions of $164 million (exclusive of interest and penalties related to uncertain tax positions of $11 million) are included in Noncurrent deferred tax assets ($3 million) and Other taxes payable ($161 million).

Our tax liabilities for uncertain tax positions relate primarily to issues common among multinational corporations. Any settlements or statute of limitations expirations could result in a significant decrease in our uncertain tax positions. Substantially all of these unrecognized tax benefits, if recognized, would impact our effective income tax rate. We do not expect that within the next twelve months any of our uncertain tax positions could significantly decrease as a result of settlements with taxing authorities or the expiration of the statutes of limitations. Our assessments are based on estimates and assumptions that have been deemed reasonable by management, but our estimates of uncertain tax positions and potential tax benefits may not be representative of actual outcomes, and any variation from such estimates could materially affect our financial statements in the period of settlement or when the statutes of limitations expire, as we treat these events as discrete items in the period of resolution. Finalizing audits with the relevant taxing authorities can include formal administrative and legal proceedings, and, as a result, it is difficult to estimate the timing and range of possible changes related to our uncertain tax positions, and such changes could be significant.

8. Financial Instruments

A. Debt

Credit Facilities

In December 2016, we entered into an amended and restated revolving credit agreement with a syndicate of banks providing for a five-year $1.0 billion senior unsecured revolving credit facility (the credit facility). In December 2017, the maturity for the amended and restated revolving credit agreement was extended through December 2022. Subject to certain conditions, we have the right to increase the credit facility to up to $1.5 billion. The credit facility contains a financial covenant requiring us to not exceed a maximum total leverage ratio (the ratio of consolidated net debt as of the end of the period to consolidated Earnings Before Interest, Income Taxes, Depreciation and Amortization (EBITDA) for such period) of 3.50:1. Upon entering into a material acquisition, the maximum total leverage ratio increases to 4.00:1, and extends until the fourth full consecutive fiscal quarter ended immediately following the consummation of a material acquisition. The credit facility also contains a clause which adds back to Adjusted Consolidated EBITDA, any operational efficiency restructuring charge (defined as charges recorded by the company during the period commencing on October 1, 2016 and ending December 31, 2019, related to operational efficiency initiatives), provided that for any twelve-month period such charges added back to Adjusted Consolidated EBITDA shall not to exceed $100 million in the aggregate.

The credit facility also contains a financial covenant requiring that we maintain a minimum interest coverage ratio (the ratio of EBITDA at the end of the period to interest expense for such period) of 3.50:1. In addition, the credit facility contains other customary covenants.

We were in compliance with all financial covenants as of March 31, 2018, and December 31, 2017. There were no amounts drawn under the credit facility as of March 31, 2018, or December 31, 2017.

We have additional lines of credit and other credit arrangements with a group of banks and other financial intermediaries for general corporate purposes. We maintain cash and cash equivalent balances in excess of our outstanding short-term borrowings. As of March 31, 2018, we had access to $71 million of lines of credit which expire at various times throughout 2018 and 2019 and are generally renewed annually. We did not have any borrowings outstanding related to these facilities as of March 31, 2018, and December 31, 2017.

Commercial Paper Program and Other Short-Term Borrowings

In February 2013, we entered into a commercial paper program with a capacity of up to $1.0 billion. As of March 31, 2018, and December 31, 2017, there was no commercial paper outstanding under this program. As of March 31, 2018, and December 31, 2017, we did not have any other short-term borrowings outstanding.

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Senior Notes and Other Long-Term Debt

On September 12, 2017, we issued $1.25 billion aggregate principal amount of our senior notes (2017 senior notes), with an original issue discount of $7 million. These notes are comprised of $750 million aggregate principal amount of 3.000% senior notes due 2027 and $500 million aggregate principal amount of 3.950% senior notes due 2047. Net proceeds from this offering were partially used in October 2017 to repay, prior to maturity, the aggregate principal amount of $750 million, and a make-whole amount and accrued interest of $4 million, of our 1.875%senior notes due 2018. The remainder of the net proceeds will be used for general corporate purposes.

On November 13, 2015, we issued $1.25 billion aggregate principal amount of our senior notes (2015 senior notes), with an original issue discount of $2 million. On January 28, 2013, we issued $3.65 billion aggregate principal amount of our senior notes (the 2013 senior notes offering) in a private placement, with an original issue discount of $10 million.

The 2013, 2015 and 2017 senior notes are governed by an indenture and supplemental indenture (collectively, the indenture) between us and Deutsche Bank Trust Company Americas, as trustee. The indenture contains certain covenants, including limitations on our and certain of our subsidiaries' ability to incur liens or engage in sale-leaseback transactions. The indenture also contains restrictions on our ability to consolidate, merge or sell substantially all of our assets. In addition, the indenture contains other customary terms, including certain events of default, upon the occurrence of which the 2013, 2015 and 2017 senior notes may be declared immediately due and payable.

Pursuant to the indenture, we are able to redeem the 2013, 2015 and 2017 senior notes, in whole or in part, at any time by paying a “make whole” premium, plus accrued and unpaid interest to, but excluding, the date of redemption. Pursuant to our tax matters agreement with Pfizer, we will not be permitted to redeem the 2013 senior notes due 2023 pursuant to this optional redemption provision, except under limited circumstances. Upon the occurrence of a change of control of us and a downgrade of the 2013, 2015 and 2017 senior notes below an investment grade rating by each of Moody's Investors Service, Inc. and Standard & Poor's Ratings Services, we are, in certain circumstances, required to make an offer to repurchase all of the outstanding 2013, 2015 and 2017 senior notes at a price equal to 101% of the aggregate principal amount of the 2013, 2015 and 2017 senior notes together with accrued and unpaid interest to, but excluding, the date of repurchase.

The components of our long-term debt are as follows:

	March 31,			December 31,
(MILLIONS OF DOLLARS)	2018			2017
3.450% 2015 senior notes due 2020	$	500		$	500
3.250% 2013 senior notes due 2023	1,350			1,350
4.500% 2015 senior notes due 2025	750			750
3.000% 2017 senior notes due 2027	750			750
4.700% 2013 senior notes due 2043	1,150			1,150
3.950% 2017 senior notes due 2047	500			500
	5,000			5,000
Unamortized debt discount / debt issuance costs	(46		)	(47		)
Long-term debt, net of discount and issuance costs	$	4,954		$	4,953

The fair value of our long-term debt was $5,083 million and $5,291 million as of March 31, 2018, and December 31, 2017, respectively, and has been determined using a third-party matrix-pricing model that uses significant inputs derived from, or corroborated by, observable market data and Zoetis’ credit rating (Level 2 inputs).

The principal amount of long-term debt outstanding, as of March 31, 2018, matures in the following years:

									After
(MILLIONS OF DOLLARS)	2019		2020		2021		2022		2022		Total
Maturities	$	—	$	500	$	—	$	—	$	4,500	$	5,000

Interest Expense

Interest expense, net of capitalized interest, was $47 million and $41 million for the three months endedMarch 31, 2018, and April 2, 2017, respectively. Capitalized interest expense was $2 million and $1 million for the three months endedMarch 31, 2018, and April 2, 2017, respectively.

B. Derivative Financial Instruments

Foreign Exchange Risk

A significant portion of our revenue, earnings and net investment in foreign affiliates is exposed to changes in foreign exchange rates. We seek to manage our foreign exchange risk, in part, through operational means, including managing same-currency revenue in relation to same-currency costs and same-currency assets in relation to same-currency liabilities. Depending on market conditions, foreign exchange risk is also managed through the use of derivative financial instruments. These financial instruments serve to protect net income against the impact of the translation into U.S. dollars of certain foreign exchange-denominated transactions. The aggregate notional amount of foreign exchange derivative financial instruments offsetting foreign currency exposures was $1.5 billion and $1.4 billion, as of March 31, 2018, and

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December 31, 2017, respectively. The derivative financial instruments primarily offset exposures in the Australian dollar, Brazilian real, British pound, Canadian dollar, Chinese renminbi, euro, and Norwegian krone. The vast majority of the foreign exchange derivative financial instruments mature within 60 days and all mature within 270 days.

All derivative contracts used to manage foreign currency risk are measured at fair value and are reported as assets or liabilities on the condensed consolidated balance sheet. The company has not designated the foreign currency forward-exchange contracts as hedging instruments. We recognize the gains and losses on forward-exchange contracts that are used to offset the same foreign currency assets or liabilities immediately into earnings along with the earnings impact of the items they generally offset. These contracts essentially take the opposite currency position of that reflected in the month-end balance sheet to counterbalance the effect of any currency movement.

Interest Rate Risk

The company may use interest rate swap contracts on certain investing and borrowing transactions to manage its net exposure to interest rates and to reduce its overall cost of borrowing. In anticipation of issuing fixed-rate debt, we may use forward-starting interest rate swaps that are designated as cash flow hedges to hedge against changes in interest rates that could impact expected future issuances of debt. To the extent these hedges of cash flows related to anticipated debt are effective, any unrealized gains or losses on the forward-starting interest rate swaps are reported in Accumulated other comprehensive loss and are recognized in income over the life of the future fixed-rate notes. When the company discontinues hedge accounting because it is no longer probable that an anticipated transaction will occur within the originally expected period of execution, or within an additional two-month period thereafter, changes to fair value accumulated in other comprehensive income are recognized immediately in earnings.

During 2017 and 2016, we entered into forward starting interest rate swaps with an aggregate notional value of $500 million. During the third quarter of 2017, we also entered in treasury lock trades with an aggregate notional value of $500 million. We designated these swaps and treasury locks (contracts) as cash flow hedges against interest rate exposure related principally to the anticipated future issuance of fixed-rate debt to be used primarily to refinance our 1.875% 2013 senior note due in 2018.

Upon issuance of our 2017 senior notes (see A. Debt: Senior Notes and Other Long-Term Debt), we terminated these contracts and paid $3 million in cash to the counterparties for settlement. The settlement amount, which represents the fair value of the contracts at the time of termination, was recorded in Accumulated other comprehensive loss, and will be amortized into income over the life of the 2017 senior notes. There was $0.1 million of ineffectiveness related to the forward swaps through the date of settlement which was immediately recognized as a loss within Interest expense—net of capitalized interest. In addition, in previous years we had entered into various forward-starting interest rate swap contracts that were designated as cash flow hedges and that were terminated upon issuance of fixed-rate notes. There were no outstanding interest rate swap contracts as of both March 31, 2018, and December 31, 2017.

Fair Value of Derivative Instruments

The classification and fair values of derivative instruments are as follows:

		Fair Value of Derivatives
		March 31,			December 31,
(MILLIONS OF DOLLARS)	Balance Sheet Location	2018			2017
Derivatives Not Designated as Hedging Instruments
Foreign currency forward-exchange contracts	Other current assets	$	11		$	10
Foreign currency forward-exchange contracts	Other current liabilities	(11		)	(9		)
Total derivatives not designated as hedging instruments		$	—		$	1

We use a market approach in valuing financial instruments on a recurring basis. Our derivative financial instruments are measured at fair value on a recurring basis using Level 2 inputs in the calculation of fair value.

The amounts of net losses on derivative instruments not designated as hedging instruments, recorded in Other (income)/deductions—net, are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Foreign currency forward-exchange contracts	$	10	$	29

These amounts were substantially offset in Other (income)/deductions—net by the effect of changing exchange rates on the underlying foreign currency exposures.

The amounts of unrecognized net gains/(losses) on derivative instruments designated as cash flow hedges, recorded, net of tax, in Other comprehensive income/(loss) were insignificant for both of the three months ended March 31, 2018 and April 2, 2017.

The net amount of deferred gains/(losses) related to derivative instruments designated as cash flow hedges that is expected to be reclassified fromAccumulated other comprehensive loss into earnings over the next 12 months is insignificant.

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9. Inventories

The components of inventory are as follows:

	March 31,		December 31,
(MILLIONS OF DOLLARS)	2018		2017
Finished goods	$	770	$	788
Work-in-process	541		484
Raw materials and supplies	130		155
Inventories	$	1,441	$	1,427

10. Goodwill and Other Intangible Assets

A. Goodwill

The components of, and changes in, the carrying amount of goodwill are as follows:

(MILLIONS OF DOLLARS)	U.S.		International		Total
Balance, December 31, 2017	$	671	$	839	$	1,510
Other(a)	—		22		22
Balance, March 31, 2018	$	671	$	861	$	1,532

^(a)  Includes adjustments for foreign currency translation.

The gross goodwill balance was $2,068 million and $2,046 million as of March 31, 2018, and December 31, 2017, respectively. Accumulated goodwill impairment losses were $536 million as of March 31, 2018, and December 31, 2017.

B. Other Intangible Assets

The components of identifiable intangible assets are as follows:

	As of March 31, 2018							As of December 31, 2017
						Identifiable							Identifiable
	Gross					Intangible Assets		Gross					Intangible Assets
	Carrying		Accumulated			Less Accumulated		Carrying		Accumulated			Less Accumulated
(MILLIONS OF DOLLARS)	Amount		Amortization			Amortization		Amount		Amortization			Amortization
Finite-lived intangible assets:
Developed technology rights	$	1,216	$	(454	)	$	762	$	1,185	$	(428	)	$	757
Brands	213		(146		)	67		213		(143		)	70
Trademarks and trade names	63		(48		)	15		62		(47		)	15
Other	239		(146		)	93		234		(143		)	91
Total finite-lived intangible assets	1,731		(794		)	937		1,694		(761		)	933
Indefinite-lived intangible assets:
Brands	37		—			37		37		—			37
Trademarks and trade names	67		—			67		67		—			67
In-process research and development	231		—			231		224		—			224
Product rights	8		—			8		8		—			8
Total indefinite-lived intangible assets	343		—			343		336		—			336
Identifiable intangible assets	$	2,074	$	(794	)	$	1,280	$	2,030	$	(761	)	$	1,269

C. Amortization

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 it benefits 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. Total amortization expense for finite-lived intangible assets was $25 million for each of the three months endedMarch 31, 2018, and April 2, 2017.

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11. Benefit Plans

Our employees ceased to participate in the Pfizer, Inc. U.S. qualified defined benefit plans and the U.S. retiree medical plan effective December 31, 2012, and liabilities associated with our employees under these plans were retained by Pfizer. Pfizer continued to credit certain employees' service with Zoetis through December 31, 2017 (or termination of employment from Zoetis, if earlier) for certain early retirement benefits with respect to Pfizer's U.S. defined benefit pension and retiree medical plans. Pension and postretirement benefit expense associated with the extended service for certain employees in the U.S. plans totaled approximately $2 million in each three month period ended March 31, 2018, and April 2, 2017.

The following table provides the net periodic benefit cost associated with our international defined benefit pension plans:

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS)	2018			2017
Service cost	$	2		$	2
Interest cost	1			1
Expected return on plan assets	(1		)	(1		)
Curtailment and settlement loss	—			1
Net periodic benefit cost	$	2		$	3

Total company contributions to the international pension plans were $2 million and $3 million for the three months endedMarch 31, 2018, and April 2, 2017, respectively. We expect to contribute a total of approximately $6 million to these plans in 2018.

12. Share-Based Payments

The company may grant a variety of share-based payments under the Zoetis 2013 Equity and Incentive Plan (the Equity Plan) to our employees and non-employee directors. The principal types of share-based awards available under the Equity Plan may include, but are not limited to, stock options, restricted stock and restricted stock units (RSUs), deferred stock units (DSUs), performance-vesting restricted stock units (PSUs) and other equity-based or cash-based awards.

The components of share-based compensation expense are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Stock options / stock appreciation rights	$	2	$	3
RSUs / DSUs	7		6
PSUs	2		2
Share-based compensation expense—total(a)	$	11	$	11

^(a)  For the three months endedMarch 31, 2018, and April 2, 2017, amounts capitalized to inventory were insignificant.

During the three months endedMarch 31, 2018, the company granted 536,070 stock options with a weighted-average exercise price of $73.26 per stock option and a weighted-average fair value of $20.29 per stock option. The fair-value based method for valuing each Zoetis stock option grant on the grant date uses the Black-Scholes-Merton option-pricing model, which incorporates a number of valuation assumptions. The weighted-average fair value was estimated based on the following assumptions: risk-free interest rate of 2.74%; expected dividend yield of 0.69%; expected stock price volatility of 23.62%; and expected term of 6.5 years. In general, stock options vest after three years of continuous service and the values determined through this fair-value based method generally are amortized on a straight-line basis over the vesting term into Cost of sales, Selling, general and administrative expenses, or Research and development expenses, as appropriate.

During the three months endedMarch 31, 2018, the company granted 428,976 RSUs with a weighted-average grant date fair value of $73.25 per RSU. RSUs are accounted for using a fair-value-based method that utilizes the closing price of Zoetis common stock on the date of grant. In general, RSUs vest after three years of continuous service from the grant date and the values generally are amortized on a straight-line basis over the vesting term into Cost of sales, Selling, general and administrative expenses, or Research and development expenses, as appropriate.

During the three months endedMarch 31, 2018, the company granted 109,574 PSUs with a weighted-average grant date fair value of $100.34 per PSU. PSUs are accounted for using a Monte Carlo simulation model. The units underlying the PSUs will be earned and vested over a three-year performance period, based upon the total shareholder return of the company in comparison to the total shareholder return of the companies comprising the S&P 500 index at the start of the performance period (Relative TSR). The weighted-average fair value was estimated based on volatility assumptions of Zoetis common stock and an average of the S&P 500 companies, which were 21.9% and 25.1%, respectively. Depending on the company’s Relative TSR performance at the end of the performance period, the recipient may earn between 0% and 200% of the target number of units. Vested units are settled in shares of the company’s common stock. PSU values are amortized on a straight-line basis over the vesting term into Cost of sales, Selling, general and administrative expenses, or Research and development expenses, as appropriate.

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13. Stockholders' Equity

Zoetis is authorized to issue 6 billion shares of common stock and 1 billion shares of preferred stock.

In December 2016, the company's Board of Directors authorized a $1.5 billion share repurchase program. Purchases of Zoetis shares may be made at the discretion of management, depending on market conditions and business needs. As of March 31, 2018, there was approximately $810 million remaining under this authorization.

Changes in common shares and treasury stock were as follows:

(MILLIONS)	Common Shares Issued(a)	Treasury Stock(a)
Balance, December 31, 2016	501.89	9.04
Share-based compensation(b)	—	(0.78	)
Share repurchase program	—	2.31
Balance, April 2, 2017	501.89	10.56
Balance, December 31, 2017	501.89	15.76
Share-based compensation(b)	—	(0.99	)
Share repurchase program	—	2.40
Balance, March 31, 2018	501.89	17.17

^(a)   Shares may not add due to rounding.

^(b)   Includes the issuance of shares of common stock and the reissuance of shares from treasury stock in connection with the vesting of employee share-based awards. Treasury stock also includes the reacquisition of shares associated with the vesting of employee share-based awards to satisfy tax withholding requirements. For additional information regarding share-based compensation, see Note 12. Share-Based Payments.

Changes, net of tax, in accumulated other comprehensive loss, excluding noncontrolling interest, are as follows:

				Currency Translation
	Derivatives			Adjustment			Benefit Plans			Accumulated Other
	Net Unrealized			Net Unrealized			Actuarial			Comprehensive
(MILLIONS OF DOLLARS)	Gains/(Losses)			Gains/(Losses)			Gains/(Losses)			Loss
Balance, December 31, 2016	$	8		$	(583	)	$	(23	)	$	(598	)
Other comprehensive income, net of tax	—			44			2			46
Balance, April 2, 2017	$	8		$	(539	)	$	(21	)	$	(552	)
Balance, December 31, 2017	$	(3	)	$	(487	)	$	(15	)	$	(505	)
Other comprehensive income, net of tax	—			76			—			76
Balance, March 31, 2018	$	(3	)	$	(411	)	$	(15	)	$	(429	)

14. Earnings per Share

The following table presents the calculation of basic and diluted earnings per share:

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)	2018			2017
Numerator
Net income before allocation to noncontrolling interests	$	350		$	239
Less: Net (loss)/income attributable to noncontrolling interests	(2		)	1
Net income attributable to Zoetis Inc.	$	352		$	238
Denominator
Weighted-average common shares outstanding	485.9			492.4
Common stock equivalents: stock options, RSUs, PSUs and DSUs	3.9			2.9
Weighted-average common and potential dilutive shares outstanding	489.8			495.3
Earnings per share attributable to Zoetis Inc. stockholders—basic	$	0.72		$	0.48
Earnings per share attributable to Zoetis Inc. stockholders—diluted	$	0.72		$	0.48

The number of stock options outstanding under the company's Equity Plan that were excluded from the computation of diluted earnings per share, as the effect would have been antidilutive, were de minimis for the three months endedMarch 31, 2018, and approximately 1 million for the three months endedApril 2, 2017.

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15. Commitments and Contingencies

We and certain of our subsidiaries are subject to numerous contingencies arising in the ordinary course of business. For a discussion of our tax contingencies, see Note 7. Income Taxes.

A. Legal Proceedings

Our non-tax contingencies include, among others, the following:

• Product liability and other product-related litigation, which can include injury, consumer, off-label promotion, antitrust and breach of contract claims.

• Commercial and other matters, which can include product-pricing claims and environmental claims and proceedings.

• Patent litigation, which typically involves challenges to the coverage and/or validity of our patents or those of third parties on various products or processes.

• Government investigations, which can involve regulation by national, state and local government agencies in the United States and in other countries.

Certain of these contingencies could result in losses, including damages, fines and/or civil penalties, and/or criminal charges, which could be substantial.

We believe that we have strong defenses in these types of matters, but litigation is inherently unpredictable and excessive verdicts do occur. We do not believe that any of these matters will have a material adverse effect on our financial position. However, we could incur judgments, enter into settlements or revise our expectations regarding the outcome of certain matters, and such developments could have a material adverse effect on our results of operations or cash flows in the period in which the amounts are paid.

We have accrued for losses that are both probable and reasonably estimable. Substantially all of these contingencies are subject to significant uncertainties and, therefore, determining the likelihood of a loss and/or the measurement of any loss can be complex. Consequently, we are unable to estimate the range of reasonably possible loss in excess of amounts accrued. Our assessments are based on estimates and assumptions that have been deemed reasonable by management, but the assessment process relies on estimates and assumptions that may prove to be incomplete or inaccurate, and unanticipated events and circumstances may occur that might cause us to change those estimates and assumptions.

Amounts recorded for legal and environmental contingencies can result from a complex series of judgments about future events and uncertainties and can rely on estimates and assumptions.

The principal matters to which we are a party are discussed below. In determining whether a pending matter is significant for financial reporting and disclosure purposes, we consider both quantitative and qualitative factors in order to assess materiality, such as, among other things, the amount of damages and the nature of any other relief sought in the proceeding, if such damages and other relief are specified; our view of the merits of the claims and of the strength of our defenses; whether the action purports to be a class action and our view of the likelihood that a class will be certified by the court; the jurisdiction in which the proceeding is pending; any experience that we or, to our knowledge, other companies have had in similar proceedings; whether disclosure of the action would be important to a reader of our financial statements, including whether disclosure might change a reader’s judgment about our financial statements in light of all of the information about the company that is available to the reader; the potential impact of the proceeding on our reputation; and the extent of public interest in the matter. In addition, with respect to patent matters, we consider, among other things, the financial significance of the product protected by the patent.

Ulianopolis, Brazil

In February 2012, the Municipality of Ulianopolis (State of Para, Brazil) filed a complaint against Fort Dodge Saúde Animal Ltda. (FDSAL), a Zoetis entity, and five other large companies alleging that waste sent to a local waste incineration facility for destruction, but that was not ultimately destroyed as the facility lost its operating permit, caused environmental impacts requiring cleanup.

The Municipality is seeking recovery of cleanup costs purportedly related to FDSAL's share of all waste accumulated at the incineration facility awaiting destruction, and compensatory damages to be allocated among the six defendants. We believe we have strong arguments against the claim, including defense strategies against any claim of joint and several liability.

At the request of the Municipal prosecutor, in April 2012, the lawsuit was suspended for one year. Since that time, the prosecutor has initiated investigations into the Municipality's actions in the matter as well as the efforts undertaken by the six defendants to remove and dispose of their individual waste from the incineration facility. On October 3, 2014, the Municipal prosecutor announced that the investigation remained ongoing and outlined the terms of a proposed Term of Reference (a document that establishes the minimum elements to be addressed in the preparation of an Environmental Impact Assessment), under which the companies would be liable to withdraw the waste and remediate the area. On March 5, 2015, we presented our response to the prosecutor’s proposed Term of Reference, arguing that the proposed terms were overly general in nature and expressing our interest in discussing alternatives to address the matter. The prosecutor agreed to consider our request to engage a technical consultant to conduct an environmental diagnostic of the contaminated area. On May 29, 2015, we, in conjunction with the other defendant companies, submitted a draft cooperation agreement to the prosecutor, which outlined the proposed terms and conditions for the engagement of a technical consultant to conduct the environmental diagnostic. On August 19, 2016, the parties and the prosecutor agreed to engage the services of a third-party consultant to conduct a limited environmental assessment of the site. The site assessment was conducted during June 2017, and a written report summarizing the results of the assessment was provided to the parties and the

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prosecutor in November 2017. The report noted that waste is still present on the site and that further environmental assessments are needed before a plan to manage that remaining waste can be prepared. We have not received any further communication from the prosecutor in response to the report.

Lascadoil Contamination in Animal Feed

An investigation by the U.S. Food and Drug Administration (FDA) and the Michigan Department of Agriculture is ongoing to determine how lascadoil, oil for industrial use, made its way into the feed supply of certain turkey and hog feed mills in Michigan. The contaminated feed is believed to have caused the deaths of approximately 50,000 turkeys and the contamination (but not death) of at least 20,000 hogs in August 2014. While it remains an open question as to how the lascadoil made its way into the animal feed, the allegations are that lascadoil intended to be sold for reuse as biofuel was inadvertently sold to producers of soy oil, who in turn, unknowingly sold the contaminated soy oil to fat recycling vendors, who then sold the contaminated soy oil to feed mills for use in animal feed. Indeed, related to the FDA investigation, Shur-Green Farms LLC, a producer of soy oil, recalled certain batches of soy oil allegedly contaminated with lascadoil on October 13, 2014.

During the course of its investigation, the FDA identified the process used to manufacture Zoetis’ Avatec® (lasalocid sodium) and Bovatec® (lasalocid sodium) products as one possible source of the lascadoil, since lascadoil contains small amounts of lasalocid, the active ingredient found in both products. Zoetis has historically sold any and all industrial lascadoil byproduct to an environmental company specializing in waste disposal. The environmental company is contractually obligated to incinerate the lascadoil or resell it for use in biofuel. Under the terms of the agreement, the environmental company is expressly prohibited from reselling the lascadoil to be used as a component in food. The FDA inspected the Zoetis site where Avatec and Bovatec are manufactured, and found no evidence that Zoetis was involved in the contamination of the animal feed.

On March 10, 2015, plaintiffs Restaurant Recycling, LLC (Restaurant Recycling) and Superior Feed Ingredients, LLC (Superior), both of whom are in the fat recycling business, filed a complaint in the Seventeenth Circuit Court for the State of Michigan against Shur-Green Farms alleging negligence and breach of warranty claims arising from their purchase of soy oil allegedly contaminated with lascadoil. Plaintiffs resold the allegedly contaminated soy oil to turkey feed mills for use in feed ingredient. Plaintiffs also named Zoetis as a defendant in the complaint alleging that Zoetis failed to properly manufacture its products and breached an implied warranty that the soy oil was fit for use at turkey and hog mills. Zoetis was served with the complaint on June 3, 2015, and we filed our answer, denying all allegations, on July 15, 2015. On August 10, 2015, several of the turkey feed mills filed a joint complaint against Restaurant Recycling, Superior, Shur-Green Farms and others, alleging claims for negligence, misrepresentation, and breach of warranty, arising out of their alleged purchase and use of the contaminated soy oil. The complaint raises only one count against Zoetis for negligence. We filed an answer to the complaint on November 2, 2015, denying the allegation. On May 16, 2016, two additional turkey producers filed a complaint in the Seventeenth Circuit Court for the State of Michigan against the company, Restaurant Recycling, Superior, Shur-Green Farms and others, alleging claims for negligence and breach of warranties. We filed an answer to the complaint on June 20, 2016, denying the allegations. The Court has consolidated all three cases in Michigan for purposes of discovery and disposition. On July 28, 2017, we filed a motion for summary disposition on the grounds that no genuine issues of material fact exist and that Zoetis is entitled to judgment as a matter of law. On October 19, 2017, the Court granted our motion and dismissed all claims against Zoetis. On October 31, 2017, the plaintiffs filed motions for reconsideration of the Court's decision granting summary disposition. The Court, denied all such motions on December 6, 2017, for the same reasons cited in the Court’s original decision. On December 27, 2017, the plaintiffs filed a request with the Michigan Court of Appeals seeking an interlocutory appeal of the lower Court’s decision, which we opposed on January 17, 2018. The matter is stayed pending a decision by the Court of Appeals.

Other Matters

The European Commission published a decision on alleged competition law infringements by several human health pharmaceutical companies on June 19, 2013. One of the involved legal entities is Alpharma LLC (previously having the name Zoetis Products LLC). Alpharma LLC's involvement is solely related to its human health activities prior to Pfizer's acquisition of King/Alpharma. Zoetis paid a fine in the amount of Euro 11 million (approximately $14 million) and was reimbursed in full by Pfizer in accordance with the Global Separation Agreement between Pfizer and Zoetis, which provides that Pfizer is obligated to indemnify Zoetis for any liabilities arising out of claims not related to its animal health assets. We filed an appeal of the decision on September 6, 2013, to the General Court of the European Union. On September 8, 2016, the General Court upheld the decision of the European Commission. On November 25, 2016, we filed an appeal to the Court of Justice of the European Union and are awaiting a ruling.

B. Guarantees and Indemnifications

In the ordinary course of business and in connection with the sale of assets and businesses, we indemnify our counterparties against certain liabilities that may arise in connection with the transaction or related to activities prior to the transaction. These indemnifications typically pertain to environmental, tax, employee and/or product-related matters and patent-infringement claims. If the indemnified party were to make a successful claim pursuant to the terms of the indemnification, we would be required to reimburse the loss. These indemnifications are generally subject to threshold amounts, specified claim periods and other restrictions and limitations. Historically, we have not paid significant amounts under these provisions and, as of March 31, 2018, recorded amounts for the estimated fair value of these indemnifications were not significant.

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16. Segment Information

Operating Segments

We manage our operations through two geographic operating segments: the United States and International. Each operating segment has responsibility for its commercial activities. Within each of these operating segments, we offer a diversified product portfolio, including vaccines, parasiticides, anti-infectives, medicated feed additives and other pharmaceuticals, for both livestock and companion animal customers. Our chief operating decision maker uses the revenue and earnings of the two operating segments, among other factors, for performance evaluation and resource allocation.

In the first quarter of 2018, the company realigned certain management responsibilities. These changes did not impact the determination of our operating segments, however they resulted in the reallocation of certain costs between segments. These changes primarily include the following: i) R&D costs related to our aquaculture business which were previously reported in Other business activities are now reported in the international commercial segment results, and ii) certain other miscellaneous costs which were previously reported in Corporate are now reported in the international commercial segment results.

Other Costs and Business Activities

Certain costs are not allocated to our operating segment results, such as costs associated with the following:

• Other business activities includes our Client Supply Services (CSS) contract manufacturing results, as well as expenses associated with our dedicated veterinary medicine research and development organization, research alliances, U.S. regulatory affairs, and other operations focused on the development of our products. Other R&D-related costs associated with our aquaculture business and non-U.S. market and regulatory activities are generally included in the international commercial segment.

• Corporate, which is responsible for platform functions such as business technology, facilities, legal, finance, human resources, business development, and communications, among others. These costs also include compensation costs, certain procurement costs, and other miscellaneous operating expenses not charged to our operating segments, as well as interest income and expense.

• Certain transactions and events such as (i) Purchase accounting adjustments, where we incur expenses associated with the amortization of fair value adjustments to inventory, intangible assets and property, plant and equipment; (ii) Acquisition-related activities, where we incur costs associated with acquiring and integrating newly acquired businesses, such as transaction costs and integration costs; and (iii) Certain significant items, which comprise substantive, unusual items that, either as a result of their nature or size, would not be expected to occur as part of our normal business on a regular basis, such as certain costs related to becoming an independent public company, restructuring charges and implementation costs associated with our cost-reduction/productivity initiatives that are not associated with an acquisition, certain asset impairment charges, certain legal and commercial settlements and the impact of divestiture-related gains and losses.

• Other unallocated includes (i) certain overhead expenses associated with our global manufacturing operations not charged to our operating segments; (ii) certain costs associated with business technology and finance that specifically support our global manufacturing operations; (iii) certain supply chain and global logistics costs; and (iv) certain procurement costs.

Segment Assets

We manage our assets on a total company basis, not by operating segment. Therefore, our chief operating decision maker does not regularly review any asset information by operating segment and, accordingly, we do not report asset information by operating segment.

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Selected Statement of Income Information

	Earnings						Depreciation and Amortization(a)
	Three Months Ended						Three Months Ended
	March 31,			April 2,			March 31,		April 2,
(MILLIONS OF DOLLARS)	2018			2017			2018		2017
U.S.
Revenue	$	634		$	605
Cost of sales	140			137
Gross profit	494			468
Gross margin	77.9		%	77.4		%
Operating expenses	96			96
Other (income)/deductions	—			—
U.S. Earnings	398			372			$	8	$	7
International
Revenue(b)	726			615
Cost of sales	234			213
Gross profit	492			402
Gross margin	67.8		%	65.4		%
Operating expenses	133			114
Other (income)/deductions	1			(3		)
International Earnings	358			291			11		11
Total operating segments	756			663			19		18
Other business activities	(81		)	(74		)	5		6
Reconciling Items:
Corporate	(153		)	(143		)	13		12
Purchase accounting adjustments	(23		)	(22		)	23		22
Acquisition-related costs	(1		)	—			—		—
Certain significant items(c)	(3		)	(4		)	—		2
Other unallocated	(78		)	(83		)	—		2
Total Earnings(d)	$	417		$	337		$	60	$	62

^(a)  Certain production facilities are shared. Depreciation and amortization is allocated to the reportable operating segments based on estimates of where the benefits of the related assets are realized.

^(b)  Revenue denominated in euros was $184 million and $148 million for the three months endedMarch 31, 2018, and April 2, 2017, respectively.

^(c)  For the three months endedMarch 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 endedApril 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.

^(d)  Defined as income before provision for taxes on income.

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Report of Independent Registered Public Accounting Firm

To the Stockholders and Board of Directors

Zoetis, Inc.:

Results of Review of Interim Financial Information

We have reviewed the condensed consolidated balance sheet of Zoetis, Inc. and subsidiaries (the Company) as of March 31, 2018, the related condensed consolidated statements of income, comprehensive income, equity and cash flows for the three-month periods ended March 31, 2018 and April 2, 2017, and the related notes (collectively, the consolidated interim financial information). Based on our reviews, we are not aware of any material modifications that should be made to the consolidated interim financial information for it to be in conformity with U.S. generally accepted accounting principles.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheet of the Company as of December 31, 2017, and the related consolidated statements of income, comprehensive income, equity, and cash flows for the year then ended (not presented herein); and in our report dated February 15, 2018, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of December 31, 2017, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

Basis for Review Results

This consolidated interim financial information is the responsibility of the Company’s management. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our reviews in accordance with the standards of the PCAOB. A review of consolidated interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the PCAOB, the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

/s/ KPMG LLP

Short Hills, New Jersey

May 2, 2018

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Overview of our business

We are a global leader in the discovery, development, manufacture and commercialization of animal health medicines and vaccines, with a focus on both livestock and companion animals. For more than 60 years we have been committed to enhancing the health of animals and bringing solutions to our customers who raise and care for them.

We manage our operations through two geographic operating segments: the United States (U.S.) and International. Within each of these operating segments, we offer a diversified product portfolio for both livestock and companion animal customers in order to capitalize on local and regional trends and customer needs. See Notes to Condensed Consolidated Financial Statements— Note 16. Segment Information.

We directly market our products to veterinarians and livestock producers located in approximately 45 countries across North America, Europe, Africa, Asia, Australia and South America, and are a market leader in nearly all of the major regions in which we operate. Through our efforts to establish an early and direct presence in many emerging markets, such as Brazil, China and Mexico, we believe we are one of the largest animal health medicines and vaccines businesses as measured by revenue across emerging markets as a whole. In markets where we do not have a direct commercial presence, we generally contract with distributors that provide logistics and sales and marketing support for our products.

We believe our investments in the industry’s largest sales organization, including our extensive network of technical and veterinary operations specialists, our high-quality manufacturing and reliability of supply, and our long track record of developing products that meet customer needs, has led to enduring and valued relationships with our customers. Our research and development (R&D) efforts enable us to deliver innovative products to address unmet needs and evolve our product lines so they remain relevant for our customers. Additionally, our management team’s focus on improving operational and cost efficiencies increases the likelihood of achieving our core growth strategies and enhancing long-term value for our shareholders.

A summary of our 2018 performance compared with the comparable 2017 period follows:

					% Change
	Three Months Ended					Related to
	March 31,		April 2,			Foreign
(MILLIONS OF DOLLARS)	2018		2017		Total	Exchange	Operational(a)
Revenue	$	1,366	$	1,231	11	4	7
Net income attributable to Zoetis	352		238		48	8	40
Adjusted net income(a)	365		261		40	6	34

^(a)  Operational growth and adjusted net income are non-GAAP financial measures. See the Non-GAAP financial measures section of this Management's Discussion and Analysis (MD&A) for more information.

Our operating environment

For a description of our operating environment, including factors which could materially affect our business, financial condition, or future results, see "Our Operating Environment" in the MD&A of our 2017 Annual Report on Form 10-K. Set forth below are updates to certain of the factors disclosed in our 2017 Form 10-K.

Quarterly Variability of Financial Results

Our quarterly financial results are subject to variability related to a number of factors including but not limited to: weather patterns, herd management decisions, economic conditions, regulatory actions, competitive dynamics, disease outbreaks, product and geographic mix, timing of price increases and timing of investment decisions.

Disease outbreaks

Sales of our livestock products could be adversely affected by the outbreak of disease carried by animals. Outbreaks of disease may reduce regional or global sales of particular animal-derived food products or result in reduced exports of such products, either due to heightened export restrictions or import prohibitions, which may reduce demand for our products. Also, the outbreak of any highly contagious disease near our main production sites could require us to immediately halt production of our products at such sites or force us to incur substantial expenses in procuring raw materials or products elsewhere. Alternatively, sales of products that treat specific disease outbreaks may increase.

Foreign exchange rates

Significant portions of our revenue and costs are exposed to changes in foreign exchange rates. Our products are sold in more than 100 countries and, as a result, our revenue is influenced by changes in foreign exchange rates. For the three months endedMarch 31, 2018, approximately 51% of our revenue was denominated in foreign currencies. We seek to manage our foreign exchange risk, in part, through operational means, including managing same-currency revenue in relation to same-currency costs and same-currency assets in relation to same-currency liabilities. As we operate in multiple foreign currencies, including the Australian dollar, Brazilian real, Canadian dollar, Chinese yuan, euro, U.K. pound and other currencies, changes in those currencies relative to the U.S. dollar will impact our revenue, cost of goods and expenses, and consequently, net income. Exchange rate fluctuations may also have an impact beyond our reported financial results and directly impact operations. These fluctuations may affect the ability to buy and sell our goods and services between markets impacted by significant exchange

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rate variances. For the three months endedMarch 31, 2018, approximately 49% of our total revenue was in U.S. dollars. Our year-over-year revenue growth was favorably impacted by approximately 4% from changes in foreign currency values relative to the U.S. dollar.

Non-GAAP financial measures

We report information in accordance with U.S. generally accepted accounting principles (GAAP). Management also measures performance using non-GAAP financial measures that may exclude certain amounts from the most directly comparable GAAP measure. Despite the importance of these measures to management in goal setting and performance measurement, non-GAAP financial measures have no standardized meaning prescribed by U.S. GAAP and, therefore, have limits in their usefulness to investors and may not be comparable to the calculation of similar measures of other companies. We present certain identified non-GAAP measures solely to provide investors with useful information to more fully understand how management assesses performance.

Operational Growth

We believe that it is important to not only understand overall revenue and earnings growth, but also “operational growth.” Operational growth is a non-GAAP financial measure defined as revenue or earnings growth excluding the impact of foreign exchange. This measure provides information on the change in revenue and earnings as if foreign currency exchange rates had not changed between the current and prior periods to facilitate a period-to-period comparison. We believe this non-GAAP measure provides a useful comparison to previous periods for the company and investors, but should not be viewed as a substitute for U.S. GAAP reported growth.

Adjusted Net Income and Adjusted Earnings Per Share

Adjusted net income and the corresponding adjusted earnings per share (EPS) are non-GAAP financial measures of performance used by management. We believe these financial measures are useful supplemental information to investors when considered together with our U.S. GAAP financial measures. We report adjusted net income to portray the results of our major operations, and the discovery, development, manufacture and commercialization of our products, prior to considering certain income statement elements. We define adjusted net income and adjusted EPS as net income attributable to Zoetis and EPS before the impact of purchase accounting adjustments, acquisition-related costs and certain significant items.

We recognize that, as an internal measure of performance, the adjusted net income and adjusted EPS measures have limitations, and we do not restrict our performance management process solely to these metrics. A limitation of the adjusted net income and adjusted EPS measures is that they provide a view of our operations without including all events during a period, such as the effects of an acquisition or amortization of purchased intangibles, and do not provide a comparable view of our performance to other companies. The adjusted net income and adjusted EPS measures are not, and should not be viewed as, a substitute for U.S. GAAP reported net income attributable to Zoetis and reported EPS. See the Adjusted Net Income section below for more information.

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Analysis of the condensed consolidated statements of income

The following discussion and analysis of our statements of income should be read along with our condensed consolidated financial statements and the notes thereto included elsewhere in Part I— Item 1 of this Quarterly Report on Form 10-Q.

	Three Months Ended
	March 31,			April 2,			%
(MILLIONS OF DOLLARS)	2018			2017			Change
Revenue	$	1,366		$	1,231		11
Costs and expenses:
Cost of sales(a)	447			443			1
% of revenue	32.7		%	36.0		%
Selling, general and administrative expenses(a)	338			309			9
% of revenue	25		%	25		%
Research and development expenses(a)	97			90			8
% of revenue	7		%	7		%
Amortization of intangible assets(a)	23			22			5
Restructuring charges/(reversals) and certain acquisition-related costs	2			(1		)	*
Interest expense, net of capitalized interest	47			41			15
Other (income)/deductions—net	(5		)	(10		)	(50	)
Income before provision for taxes on income	417			337			24
% of revenue	31		%	27		%
Provision for taxes on income	67			98			(32	)
Effective tax rate	16.1		%	29.1		%
Net income before allocation to noncontrolling interests	350			239			46
Less: Net income attributable to noncontrolling interests	(2		)	1			*
Net income attributable to Zoetis	$	352		$	238		48
% of revenue	26		%	19		%

* Calculation not meaningful.

Certain amounts and percentages may reflect rounding adjustments.

^(a)  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.

Revenue

Three months ended March 31, 2018vs.three months ended April 2, 2017

Total revenue increased by $135 million, or 11%, in the three months ended March 31, 2018, compared with the three months ended April 2, 2017, an increase of $88 million, or 7%, on an operational basis. Operational revenue growth was comprised primarily of the following:

• increased volume from our in-line products contributed approximately 3%, including 2% from our key dermatology products;

• volume growth from new products contributed approximately 2%; and

• price comprised 2%.

Foreign exchange increased reported revenue growth by approximately 4%.

Costs and Expenses

Cost of sales
	Three Months Ended
	March 31,			April 2,			%
(MILLIONS OF DOLLARS)	2018			2017			Change
Cost of sales	$	447		$	443		1
% of revenue	32.7		%	36.0		%

Certain amounts and percentages may reflect rounding adjustments.

26 |

Three months ended March 31, 2018 vs. three months ended April 2, 2017

Cost of sales as a percentage of revenue decreased from 36.0% to 32.7% in the three months ended March 31, 2018, compared with the three months ended April 2, 2017, primarily as a result of:

• continued cost improvements and efficiencies in our manufacturing network,

partially offset by:

• unfavorable foreign exchange.

Selling, general and administrative expenses
	Three Months Ended
	March 31,			April 2,			%
(MILLIONS OF DOLLARS)	2018			2017			Change
Selling, general and administrative expenses	$	338		$	309		9
% of revenue	25		%	25		%

Certain amounts and percentages may reflect rounding adjustments.

Three months ended March 31, 2018vs.three months ended April 2, 2017

Selling, general & administrative (SG&A) expenses increased by $29 million, or 9%, in the three months ended March 31, 2018, compared with the three months ended April 2, 2017, primarily as a result of:

• an increase in certain compensation-related expenses;

• unfavorable foreign exchange;

• higher professional services and consulting charges; and

• higher advertising and promotional spending associated with new products.

Research and development expenses
	Three Months Ended
	March 31,			April 2,			%
(MILLIONS OF DOLLARS)	2018			2017			Change
Research and development expenses	$	97		$	90		8
% of revenue	7		%	7		%

Certain amounts and percentages may reflect rounding adjustments.

Three months ended March 31, 2018vs.three months ended April 2, 2017

R&D expenses increased by $7 million, or 8%, in the three months ended March 31, 2018, compared with the three months ended April 2, 2017, primarily as a result of:

• unfavorable foreign exchange;

• increased headcount driven by project investments;

• an increase in certain compensation-related expenses; and

• the inclusion of the Irish biologic therapeutics business acquired in 2017.

Amortization of intangible assets
	Three Months Ended
	March 31,		April 2,		%
(MILLIONS OF DOLLARS)	2018		2017		Change
Amortization of intangible assets	$	23	$	22	5

Certain amounts and percentages may reflect rounding adjustments.

Three months ended March 31, 2018 vs. three months ended April 2, 2017

Amortization of intangible assets increased by $1 million, or 5%, in the three months ended March 31, 2018, compared with the three months ended April 2, 2017.

27 |

Restructuring charges/(reversals) and certain acquisition-related costs
	Three Months Ended
	March 31,		April 2,			%
(MILLIONS OF DOLLARS)	2018		2017			Change
Restructuring charges/(reversals) and certain acquisition-related costs	$	2	$	(1	)	*

* Calculation not meaningful.

Certain amounts and percentages may reflect rounding adjustments.

During 2015, we launched a comprehensive operational efficiency program, which was incremental to the previously announced supply network strategy. These initiatives focused on reducing complexity in our product portfolios, changing our selling approach in certain markets, reducing our presence in certain countries, and exiting manufacturing sites over a long term period. We have also continued to optimize our resource allocation and efficiency by reducing resources associated with non-customer facing activities and operating more efficiently as a result of less internal complexity and more standardization of processes. As part of these initiatives, we planned to reduce certain positions through divestitures, normal attrition and involuntary terminations by approximately 2,800, subject to consultations with works councils and unions in certain countries. Including divestitures, as of March 31, 2018, approximately 2,600 positions have been eliminated as part of these initiatives. The comprehensive operational efficiency program was substantially completed as of December 31, 2017. We expect to complete the supply network strategy over the next several years.

Our acquisition-related costs primarily relate to restructuring charges for employees, assets and activities that will not continue in the future, as well as integration costs. The majority of these net restructuring charges are related to termination costs, but we also exited a number of distributor and other contracts and performed certain facility rationalization efforts. Our integration costs are generally comprised of consulting costs related to the integration of systems and processes, as well as product transfer costs.

For additional information regarding restructuring charges and acquisition-related costs, see Notes to Condensed Consolidated Financial Statements— Note 5. Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives.

Three months ended March 31, 2018 vs. three months ended April 2, 2017

The change in restructuring charges and certain acquisition-related costs from a $1 million reversal in the three months ended April 2, 2017, to $2 million in the three months ended March 31, 2018, is primarily the result of higher employee termination costs as a result of our supply network strategy, in addition to integration costs.

Interest expense, net of capitalized interest
	Three Months Ended
	March 31,		April 2,		%
(MILLIONS OF DOLLARS)	2018		2017		Change
Interest expense, net of capitalized interest	$	47	$	41	15

Certain amounts and percentages may reflect rounding adjustments.

Three months ended March 31, 2018 vs. three months ended April 2, 2017

Interest expense, net of capitalized interest, increased by $6 million, or 15% in the three months ended March 31, 2018, compared with the three months ended April 2, 2017, as a result of the issuance of $1.25 billion aggregate principal amount of our senior notes in September 2017.

Other (income)/deductions—net
	Three Months Ended
	March 31,			April 2,			%
(MILLIONS OF DOLLARS)	2018			2017			Change
Other (income)/deductions—net	$	(5	)	$	(10	)	(50	)

Certain amounts and percentages may reflect rounding adjustments.

Three months ended March 31, 2018 vs. three months ended April 2, 2017

The change in Other (income)/deductions—net from income of $10 million in the three months ended April 2, 2017, to income of $5 million in the three months ended March 31, 2018, is primarily a result of higher foreign currency losses, primarily driven by costs related to hedging and exposures to certain emerging market currencies.

Provision for taxes on income
	Three Months Ended
	March 31,			April 2,			%
(MILLIONS OF DOLLARS)	2018			2017			Change
Provision for taxes on income	$	67		$	98		(32	)
Effective tax rate	16.1		%	29.1		%

Certain amounts and percentages may reflect rounding adjustments.

28 |

On December 22, 2017, the Tax Cuts and Jobs Act (the Tax Act) was enacted which, among other changes, reduced the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018. The Tax Act made broad and complex changes to the U.S. tax code and it will take time to fully analyze the impact of the changes. Based on the information available at that time, and the current interpretation of the Tax Act, for the year ended December 31, 2017 the company was able to make a reasonable estimate and recorded an initial provisional net tax expense of $212 million related to the one-time mandatory deemed repatriation tax, payable over eight years, partially offset by the remeasurement of the deferred tax assets and liabilities, as of the date of enactment, due to the reduction in the U.S. federal corporate tax rate. Pursuant to the Staff Accounting Bulletin published by the Securities and Exchange Commission on December 22, 2017, addressing the challenges in accounting for the effects of the Tax Act in the period of enactment, companies must report provisional amounts for those specific income tax effects of the Tax Act for which the accounting is incomplete but a reasonable estimate can be determined. Those provisional amounts will be subject to adjustment during a measurement period of up to one year from the enactment date (measurement-period adjustment). Pursuant to this guidance, the estimated impact of the Tax Act was based on a preliminary review of the new tax law and projected future financial results and is subject to revision based upon further analysis and interpretation of the Tax Act and to the extent that future results differ from currently available projections.

Three months ended March 31, 2018 vs. three months ended April 2, 2017

The effective tax rate was 16.1% for the three months ended March 31, 2018, compared with 29.1% for the three months ended April 2, 2017. The lower effective tax rate for the three months ended March 31, 2018, was primarily attributable to:

• reduction of the U.S. federal corporate income tax rate, effective January 1, 2018, pursuant to the Tax Act;

• changes in the jurisdictional mix of earnings, which includes the impact of the location of earnings from operations and repatriation costs. The jurisdictional mix of earnings can vary as a result of repatriation decisions and operating fluctuations in the normal course of business and the impact of non-deductible items;

• a $8 million and $5 million discrete tax benefit recorded in the first quarter of 2018 and 2017, respectively, related to the excess tax benefits for share-based payments;

• a $8 million and $3 million discrete tax benefit recorded in the first quarter of 2018 and 2017, respectively, related to a remeasurement of deferred taxes as a result of a change in non-U.S. statutory tax rates; and

• a $2 million net discrete tax benefit recorded in the first quarter of 2018, associated with a measurement-period adjustment related to the provisional one-time mandatory deemed repatriation tax on the company's undistributed non-U.S. earnings pursuant to the Tax Act enacted on December 22, 2017.

29 |

Operating Segment Results

In the first quarter of 2018, the company realigned certain management responsibilities. These changes did not impact the determination of our operating segments, however they resulted in the reallocation of certain costs between segments. These changes primarily include the following: i) R&D costs related to our aquaculture business which were previously reported in Other business activities are now reported in the international commercial segment results, and ii) certain other miscellaneous costs which were previously reported in Corporate are now reported in the international commercial segment results.

On a global basis, the mix of revenue between livestock and companion animal products was as follows:

					% Change
	Three Months Ended						Related to
	March 31,		April 2,				Foreign
(MILLIONS OF DOLLARS)	2018		2017		Total		Exchange	Operational
U.S.
Livestock	$	292	$	282	4		—	4
Companion animal	342		323		6		—	6
	634		605		5		—	5
International
Livestock	478		421		14		7	7
Companion animal	248		194		28		9	19
	726		615		18		7	11
Total
Livestock	770		703		10		4	6
Companion animal	590		517		14		3	11
Contract manufacturing	6		11		(45	)	10	(55	)
	$	1,366	$	1,231	11		4	7

Certain amounts and percentages may reflect rounding adjustments.

30 |

Earnings by segment and the operational and foreign exchange changes versus the comparable prior year period were as follows:

							% Change
	Three Months Ended								Related to
	March 31,			April 2,					Foreign
(MILLIONS OF DOLLARS)	2018			2017			Total		Exchange	Operational
U.S.
Revenue	$	634		$	605		5		—	5
Cost of Sales	140			137			2		—	2
Gross Profit	494			468			6		—	6
Gross Margin	77.9		%	77.4		%
Operating Expenses	96			96			—		—	—
Other (income)/deductions	—			—			—		—	—
U.S. Earnings	398			372			7		—	7
International
Revenue	726			615			18		7	11
Cost of Sales	234			213			10		6	4
Gross Profit	492			402			22		8	14
Gross Margin	67.8		%	65.4		%
Operating Expenses	133			114			17		8	9
Other (income)/deductions	1			(3		)	*		*	*
International Earnings	358			291			23		8	15
Total operating segments	756			663			14		3	11
Other business activities	(81		)	(74		)	9
Reconciling Items:
Corporate	(153		)	(143		)	7
Purchase accounting adjustments	(23		)	(22		)	5
Acquisition-related costs	(1		)	—			*
Certain significant items	(3		)	(4		)	(25	)
Other unallocated	(78		)	(83		)	(6	)
Income before provision for taxes on income	$	417		$	337		24

* Calculation not meaningful.

Certain amounts and percentages may reflect rounding adjustments.

Three months ended March 31, 2018 vs. three months ended April 2, 2017

U.S. operating segment

U.S. segment revenue increased by $29 million, or 5%, in the three months ended March 31, 2018, compared with the three months ended April 2, 2017, reflecting growth of approximately $19 million in companion animal products and growth of approximately $10 million in livestock products.

• Companion animal revenue growth was driven primarily by increased sales in our dermatology portfolio, as well as new products. Growth was tempered by lower sales of certain in-line products due to expected competition.

• Livestock revenue increased primarily due to higher sales of cattle and poultry products and a return to growth in our swine business. Growth of cattle products was driven by favorable market conditions in the beef market, including higher feedlot placements and variable weather conditions, which drove higher disease risk and incidence. Growth was partially offset by unfavorable market conditions in dairy, including declining producer profitability due to low milk prices. For poultry, growth was driven by increased sales of medicated feed additive products.

U.S. segment earnings increased by $26 million, or 7%, in the three months ended March 31, 2018, compared with the three months ended April 2, 2017, primarily due to revenue growth and improved gross margins.

31 |

International operating segment

International segment revenue increased by $111 million, or 18%, in the three months ended March 31, 2018, compared with the three months ended April 2, 2017. Operational revenue increased by $65 million, or 11%, driven by growth of approximately $37 million in companion animal products and growth of approximately $28 million in livestock products.

• Companion animal revenue growth resulted primarily from increased sales across multiple international markets of our dermatology portfolio, and new products including Simparica^®, as well as growth invaccines in China.

• Livestock growth was driven primarily by strong performance in poultry and cattle products. Growth in poultry products was driven by increased sales of medicated feed additives, primarily in emerging markets. Cattle products grew due to the colder weather increasing treatments and strong demand for vaccines in Mexico. Strong demand in other emerging markets also contributed to growth.

Additionally, segment revenue was favorably impacted by foreign exchange, which increased revenue by approximately $46 million, or 7%, primarily driven by the appreciation of the euro, U.K. pound, Chinese renminbi, Mexican peso and Australian dollar.

International segment earnings increased by $67 million, or 23%, in the three months ended March 31, 2018, compared with the three months ended April 2, 2017. Operational earnings growth was $43 million, or 15%, primarily due to higher revenue and improved gross margin, partially offset by higher operating expenses.

Other business activities

Other business activities includes our Client Supply Services (CSS) contract manufacturing results, as well as expenses associated with our dedicated veterinary medicine research and development organization, research alliances, U.S. regulatory affairs and other operations focused on the development of our products. Other R&D-related costs associated with non-U.S. market and regulatory activities are generally included in the respective regional segment.

Three months ended March 31, 2018 vs. three months ended April 2, 2017

Other business activities net loss increased by $7 million, or 9%, in the three months ended March 31, 2018, compared with the three months ended April 2, 2017, reflecting unfavorable foreign exchange, an increase in R&D project investments, compensation-related costs, and the inclusion of the Irish biologic therapeutics business acquired in 2017.

Reconciling items

Reconciling items include certain costs that are not allocated to our operating segments results, such as costs associated with the following:

• Corporate, which includes certain costs associated with business technology, facilities, legal, finance, human resources, business development and communications, among others. These costs also include certain compensation costs, certain procurement costs, and other miscellaneous operating expenses that are not charged to our operating segments, as well as interest income and expense;

• Certain transactions and events such as (i) Purchase accounting adjustments, which includes expenses associated with the amortization of fair value adjustments to inventory, intangible assets, and property, plant and equipment; (ii) Acquisition-related activities, which includes costs for acquisition and integration; and (iii) Certain significant items, which includes non-acquisition-related restructuring charges, certain asset impairment charges, stand-up costs, certain legal and commercial settlements, and costs associated with cost reduction/productivity initiatives; and

• Other unallocated, which includes (i) certain overhead expenses associated with our global manufacturing operations not charged to our operating segments; (ii) certain costs associated with business technology and finance that specifically support our global manufacturing operations; (iii) certain supply chain and global logistics costs; and (iv) certain procurement costs.

Three months ended March 31, 2018 vs. three months ended April 2, 2017

Corporate expenses increased by $10 million, or 7%, in the three months ended March 31, 2018, compared with the three months ended April 2, 2017, primarilydue to an increase in certain compensation costs not allocated to our operating segments.

Other unallocated expenses declined by $5 million, or 6%, in the three months ended March 31, 2018, compared with the three months ended April 2, 2017, primarilydue to continued cost improvements and efficiencies in our manufacturing network, and lower global manufacturing and supply costs, partially offset by the unfavorable impact of foreign exchange.

See Notes to Condensed Consolidated Financial Statements—Note 16. Segment Information for further information.

Adjusted net income

General description of adjusted net income (a non-GAAP financial measure)

Adjusted net income is an alternative view of performance used by management, and we believe that investors’ understanding of our performance is enhanced by disclosing this performance measure. The adjusted net income measure is an important internal measurement for us. Additionally, we measure our overall performance on this basis in conjunction with other performance metrics. The following are examples of how the adjusted net income measure is utilized:

32 |

• senior management receives a monthly analysis of our operating results that is prepared on an adjusted net income basis;

• our annual budgets are prepared on an adjusted net income basis; and

• other goal setting and performance measurements.

Purchase accounting adjustments

Adjusted net income is calculated prior to considering certain significant purchase accounting impacts that result from business combinations and net asset acquisitions. These impacts, primarily associated with the acquisition of the Pharmaq business (acquired in November 2015), certain assets of Abbott Animal Health (acquired in February 2015), King Animal Health (KAH) (acquired in 2011), Fort Dodge Animal Health (FDAH) (acquired in 2009), and Pharmacia Animal Health business (acquired in 2003), include amortization related to the increase in fair value of the acquired finite-lived intangible assets and depreciation related to the increase/decrease to fair value of the acquired fixed assets. Therefore, the adjusted net income measure includes the revenue earned upon the sale of the acquired products without considering the aforementioned significant charges.

While certain purchase accounting adjustments can occur through 20 or more years, this presentation provides an alternative view of our performance that is used by management to internally assess business performance. We believe the elimination of amortization attributable to acquired intangible assets provides management and investors an alternative view of our business results by providing a degree of parity to internally developed intangible assets for which R&D costs previously have been expensed.

A completely accurate comparison of internally developed intangible assets and acquired intangible assets cannot be achieved through adjusted net income. These components of adjusted net income are derived solely from the impact of the items listed above. We have not factored in the impact of any other differences in experience that might have occurred if we had discovered and developed those intangible assets on our own, and this approach does not intend to be representative of the results that would have occurred in those circumstances. For example, our R&D costs in total, and in the periods presented, may have been different; our speed to commercialization and resulting revenue, if any, may have been different; or our costs to manufacture may have been different. In addition, our marketing efforts may have been received differently by our customers. As such, in total, there can be no assurance that our adjusted net income amounts would have been the same as presented had we discovered and developed the acquired intangible assets.

Acquisition-related costs

Adjusted net income is calculated prior to considering transaction and integration costs associated with significant business combinations or net asset acquisitions because these costs are unique to each transaction and represent costs that were incurred to acquire and integrate certain businesses as a result of the acquisition decision. We have made no adjustments for the resulting synergies.

We believe that viewing income prior to considering these charges provides investors with a useful additional perspective because the significant costs incurred in a business combination result primarily from the need to eliminate duplicate assets, activities or employees––a natural result of acquiring a fully integrated set of activities. For this reason, we believe that the costs incurred to convert disparate systems, to close duplicative facilities or to eliminate duplicate positions (for example, in the context of a business combination) can be viewed differently from those costs incurred in the ordinary course of business.

The integration costs associated with a business combination may occur over several years, with the more significant impacts generally ending within three years of the transaction. Because of the need for certain external approvals for some actions, the span of time needed to achieve certain restructuring and integration activities can be lengthy. For example, due to the regulated nature of the animal health medicines and vaccines business, the closure of excess facilities can take several years, as all manufacturing changes are subject to extensive validation and testing and must be approved by the FDA and/or other regulatory authorities.

Certain significant items

Adjusted net income is calculated prior to considering certain significant items. Certain significant items represent substantive, unusual items that are evaluated on an individual basis. Such evaluation considers both the quantitative and the qualitative aspect of their unusual nature. Unusual, in this context, may represent items that are not part of our ongoing business; items that, either as a result of their nature or size, we would not expect to occur as part of our normal business on a regular basis; items that would be nonrecurring; or items that relate to products that we no longer sell. While not all-inclusive, examples of items that could be included as certain significant items would be costs related to becoming an independent public company; a major non-acquisition-related restructuring charge and associated implementation costs for a program that is specific in nature with a defined term, such as those related to our non-acquisition-related cost-reduction and productivity initiatives; amounts related to disposals of products or facilities that do not qualify as discontinued operations as defined by U.S. GAAP; certain intangible asset impairments; adjustments related to the resolution of certain tax positions; significant currency devaluation; the impact of adopting certain significant, event-driven tax legislation; or charges related to legal matters. See Notes to Condensed Consolidated Financial Statements—Note 15. Commitments and Contingencies. Our normal, ongoing defense costs or settlements of and accruals on legal matters made in the normal course of our business would not be considered certain significant items.

33 |

Reconciliation

A reconciliation of net income attributable to Zoetis, as reported under U.S. GAAP, to adjusted net income follows:  

	Three Months Ended
	March 31,		April 2,		%
(MILLIONS OF DOLLARS)	2018		2017		Change
GAAP reported net income attributable to Zoetis	$	352	$	238	48
Purchase accounting adjustments—net of tax	12		19		(37	)
Acquisition-related costs—net of tax	1		—		*
Certain significant items—net of tax	—		4		(100	)
Non-GAAP adjusted net income(a)	$	365	$	261	40

*Calculation not meaningful.

Certain amounts and percentages may reflect rounding adjustments.

^(a)   The effective tax rate on adjusted pretax income is 18.2% and 27.8% for the three months ended March 31, 2018, and April 2, 2017, respectively. The lower effective tax rate for the three months ended March 31, 2018, compared with the three months ended April 2, 2017, was primarily attributable to (i) the reduction of the U.S. federal corporate income tax rate from 35% to 21%, effective January 1, 2018, pursuant to the Tax Act, (ii) changes in the jurisdictional mix of earnings, which includes the impact of the location of earnings as well as repatriation costs, (iii) a $8 million and $5 million discrete tax benefit recorded in the first quarter of 2018 and 2017, respectively, related to the excess tax benefits for share-based payments, and (iv) a $3 million discrete tax benefit recorded in the first quarter of 2018 related to a remeasurement of deferred taxes as a result of a change in non-U.S. statutory tax rates.

A reconciliation of reported diluted earnings per share (EPS), as reported under U.S. GAAP, to non-GAAP adjusted diluted EPS follows:

	Three Months Ended
	March 31,		April 2,		%
	2018		2017		Change
Earnings per share—diluted(a):
GAAP reported EPS attributable to Zoetis—diluted	$	0.72	$	0.48	50
Purchase accounting adjustments—net of tax	0.03		0.04		(25	)
Acquisition-related costs—net of tax	—		—		—
Certain significant items—net of tax	—		0.01		(100	)
Non-GAAP adjusted EPS—diluted	$	0.75	$	0.53	42

Certain amounts and percentages may reflect rounding adjustments.

^(a)  Diluted earnings per share was computed using the weighted-average common shares outstanding during the period plus the common stock equivalents related to stock options, restricted stock units, performance-vesting restricted stock units and deferred stock units.

Adjusted net income includes the following charges for each of the periods presented:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Interest expense, net of capitalized interest	$	47	$	41
Interest income	6		2
Income taxes	81		101
Depreciation	33		34
Amortization	4		4

34 |

Adjusted net income, as shown above, excludes the following items:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Purchase accounting adjustments:
Amortization and depreciation(a)	$	21	$	20
Cost of sales(a)	2		2
Total purchase accounting adjustments—pre-tax	23		22
Income taxes(b)	11		3
Total purchase accounting adjustments—net of tax	12		19
Acquisition-related costs:
Integration costs	1		—
Total acquisition-related costs—pre-tax	1		—
Income taxes(b)	—		—
Total acquisition-related costs—net of tax	1		—
Certain significant items:
Operational efficiency initiative(c)	—		(1		)
Supply network strategy(d)	2		3
Other(e)	1		2
Total certain significant items—pre-tax	3		4
Income taxes(b)	3		—
Total certain significant items—net of tax	—		4
Total purchase accounting adjustments, acquisition-related costs, and certain significant items—net of tax	$	13	$	23

Certain amounts may reflect rounding adjustments.

^(a)   Amortization and depreciation expenses related to Purchase accounting adjustments with respect to identifiable intangible assets and property, plant and equipment.

^(b)   Income taxes include the tax effect of the associated pre-tax amounts, calculated by determining the jurisdictional location of the pre-tax amounts and applying that jurisdiction's applicable tax rate.

Income taxes in Purchase accounting adjustments for the three months endedMarch 31, 2018, also includes a tax benefit related to the remeasurement of deferred taxes as a result of a change in non-U.S. statutory tax rates. Income taxes in Purchase accounting adjustments for the three months ended April 2, 2017, also includes a tax benefit related to the remeasurement of deferred taxes as a result of a change in tax rates and a net tax charge related to prior period tax adjustments.

Income taxes in Certain significant items for the three months endedMarch 31, 2018, includes a net tax benefit related to a measurement-period adjustment to the provisional one-time mandatory deemed repatriation tax on the company's undistributed non-U.S. earnings, pursuant to the Tax Act enacted on December 22, 2017. Income taxes in Certain significant items for the three months endedApril 2, 2017, also includes a net charge related to the revaluation of the company’s deferred tax assets and liabilities, using the rates expected to be in place at the time of the reversal.

^(c)  For the three months ended April 2, 2017, represents a net reversal of previously accrued employee termination costs.

^(d)   For the three months ended March 31, 2018, represents consulting fees of $1 million and employee termination costs of $1 million. For the three months ended April 2, 2017, represents accelerated depreciation charges of $1 million, and consulting fees of $2 million.

^(e)   For the three months ended March 31, 2018, primarily represents charges 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, represents costs associated with changes to our operating model.

35 |

The classification of the above items excluded from adjusted net income are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Cost of sales:
Purchase accounting adjustments	$	2	$	2
Accelerated depreciation	—		1
Consulting fees	1		2
Total Cost of sales	3		5
Selling, general & administrative expenses:
Purchase accounting adjustments	1		1
Other	1		2
Total Selling, general & administrative expenses	2		3
Research & development expenses:
Purchase accounting adjustments	1		1
Total Research & development expenses	1		1
Amortization of intangible assets:
Purchase accounting adjustments	19		18
Total Amortization of intangible assets	19		18
Restructuring (reversals)/ charges and certain acquisition-related costs:
Integration costs	1		—
Employee termination costs	1		(1		)
Total Restructuring (reversals)/ charges and certain acquisition-related costs	2		(1		)
Provision for taxes on income	14		3
Total purchase accounting adjustments, acquisition-related costs, and certain significant items—net of tax	$	13	$	23

Certain amounts may reflect rounding adjustments.

Analysis of the condensed consolidated statements of comprehensive income

Substantially all changes in other comprehensive income for the periods presented are related to foreign currency translation adjustments. These changes result from the strengthening or weakening of the U.S. dollar as compared to the currencies in the countries in which we do business. The gains and losses associated with these changes are deferred on the balance sheet in Accumulated other comprehensive loss until realized.

Analysis of the condensed consolidated balance sheets

March 31, 2018 vs. December 31, 2017

For a discussion about the changes in Cash and cash equivalents, Short-term borrowings, Current portion of long-term debt, and Long-term debt, net of discount and issuance costs, see “Analysis of financial condition, liquidity and capital resources” below.

Accounts receivable, less allowance for doubtful accounts decreased as a result of the timing of customer collections.

The net changes in Deferred tax assets, Deferred tax liabilities, Income taxes payable and Other taxes payable primarily reflect adjustments to the accrual for the income tax provision for the first quarter of 2018, as well as the impact of the remeasurement of deferred taxes as a result of a change in tax rates. See Notes to Condensed Consolidated Financial Statements— Note 7. Income Taxes.

Accounts payable decreased as a result of the timing of payments.

Accrued compensation and related items decreased primarily due to payment of 2017 annual bonuses to eligible employees and 2017 employee savings plan contributions, partially offset by the pro rata accrual of similar items for 2018.

Accrued expenses and Other current liabilities decreased primarily as a result of payment of accrued expenses, including accrued interest and accrued contract rebates.

For an analysis of the changes in Total Equity, see the Condensed Consolidated Statements of Equity and Notes to Condensed Consolidated Financial Statements— Note 13. Stockholders' Equity.

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Analysis of the condensed consolidated statements of cash flows

	Three Months Ended
	March 31,			April 2,			%
(MILLIONS OF DOLLARS)	2018			2017			Change
Net cash provided by (used in):
Operating activities	$	389		$	119		*
Investing activities	(45		)	(48		)	(6	)
Financing activities	(262		)	(176		)	49
Effect of exchange-rate changes on cash and cash equivalents	8			7			14
Net increase (decrease) in cash and cash equivalents	$	90		$	(98	)	*

* Calculation not meaningful.

Certain amounts and percentages may reflect rounding adjustments.

Operating activities

Three months endedMarch 31, 2018vs.three months endedApril 2, 2017

Net cash provided by operating activities was $389 million for the three months ended March 31, 2018, compared with net cash provided by operating activities of $119 million for the three months ended April 2, 2017. The increase in operating cash flows was primarily attributable to higher income before allocation to noncontrolling interests and the timing of receipts and payments in the ordinary course of business.

Investing activities

Three months endedMarch 31, 2018vs.three months endedApril 2, 2017

Our net cash used in investing activities was $45 million for the three months ended March 31, 2018, compared with net cash used in investing activities of $48 million for the three months ended April 2, 2017. The net cash used in investing activities for 2018 was due primarily to purchases of property, plant and equipment, partially offset by proceeds from the 2017 sale of our manufacturing site in Guarulhos, Brazil. The net cash used in investing activities for 2017 was due primarily to purchases of property, plant and equipment, the acquisition of a Norwegian fish vaccination company, and an investment related to a European livestock monitoring company.

Financing activities

Three months endedMarch 31, 2018vs.three months endedApril 2, 2017

Our net cash used in financing activities was $262 million for the three months ended March 31, 2018, compared with net cash used in financing activities of $176 million for the three months ended April 2, 2017. The net cash used in financing activities for 2018 and 2017 was primarily attributable to the purchase of treasury shares and the payment of dividends.

Analysis of financial condition, liquidity and capital resources

While we believe our cash and cash equivalents on hand, our operating cash flows and our existing financing arrangements will be sufficient to support our future cash needs, this may be subject to the environment in which we operate. Risks to our meeting future funding requirements include global economic conditions described in the following paragraph.

Global financial markets may be impacted by macroeconomic, business and financial volatility. As markets change, we will continue to monitor our liquidity position, but there can be no assurance that a challenging economic environment or an economic downturn will not impact our liquidity or our ability to obtain future financing.

Selected measures of liquidity and capital resources

Certain relevant measures of our liquidity and capital resources follow:

	March 31,		December 31,
(MILLIONS OF DOLLARS)	2018		2017
Cash and cash equivalents	$	1,654	$	1,564
Accounts receivable, net(a)	943		998
Long-term debt	4,954		4,953
Working capital	3,267		3,123
Ratio of current assets to current liabilities	4.27:1		3.85:1

^(a)  Accounts receivable are usually collected over a period of 60 to 90 days. For the three months endedMarch 31, 2018, compared with December 31, 2017, the number of days that accounts receivables are outstanding remained approximately the same. We regularly monitor our accounts receivable for collectability, particularly in markets where economic conditions remain uncertain. We believe that our allowance for doubtful accounts is appropriate. Our assessment is based on such factors as past due aging, historical and expected collection patterns, the financial condition of our customers, the robust nature of our credit and collection practices and the economic environment.

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For additional information about the sources and uses of our funds, see the Analysis of the condensed consolidated balance sheets and Analysis of the condensed consolidated statements of cash flows sections of this MD&A.

Credit facility and other lines of credit

In December 2016, we entered into an amended and restated revolving credit agreement with a syndicate of banks providing for a five-year $1.0 billion senior unsecured revolving credit facility (the credit facility). In December 2017, the maturity for the amended and restated revolving credit agreement was extended through December 2022. Subject to certain conditions, we have the right to increase the credit facility to up to $1.5 billion. The credit facility contains a financial covenant requiring us to not exceed a maximum total leverage ratio (the ratio of consolidated net debt as of the end of the period to consolidated Earnings Before Interest, Income Taxes, Depreciation and Amortization (EBITDA) for such period) of 3.50:1. Upon entering into a material acquisition, the maximum total leverage ratio increases to 4.00:1, and extends until the fourth full consecutive fiscal quarter ended immediately following the consummation of a material acquisition. The credit facility also contains a clause which adds back to Adjusted Consolidated EBITDA, any operational efficiency restructuring charge (defined as charges recorded by the company during the period commencing on October 1, 2016 and ending December 31, 2019, related to operational efficiency initiatives), provided that for any twelve-month period such charges added back to Adjusted Consolidated EBITDA shall not to exceed $100 million in the aggregate.

The credit facility also contains a financial covenant requiring that we maintain a minimum interest coverage ratio (the ratio of EBITDA at the end of the period to interest expense for such period) of 3.50:1. In addition, the credit facility contains other customary covenants.

We were in compliance with all financial covenants as of March 31, 2018 and December 31, 2017. There were no amounts drawn under the credit facility as of March 31, 2018 or December 31, 2017.

We have additional lines of credit and other credit arrangements with a group of banks and other financial intermediaries for general corporate purposes. We maintain cash and cash equivalent balances in excess of our outstanding short-term borrowings. As of March 31, 2018, we had access to $71 million of lines of credit which expire at various times throughout 2018 and 2019 and are generally renewed annually. We did not have any borrowings outstanding related to these facilities as of March 31, 2018 and December 31, 2017.

Domestic and international short-term funds

Many of our operations are conducted outside the United States. The amount of funds held in the United States will fluctuate due to the timing of receipts and payments in the ordinary course of business and due to other reasons, such as business development activities. As part of our ongoing liquidity assessments, we regularly monitor the mix of U.S. and international cash flows (both inflows and outflows). Repatriation of overseas funds can result in additional U.S. state income taxes, foreign withholding taxes and currency gains and losses. We recorded U.S. deferred tax liabilities associated with the one-time mandatory deemed repatriation tax imposed by the Tax Act to the extent amounts earned overseas are expected to be indefinitely reinvested outside the United States, no accrual for foreign withholding taxes and currency gains and losses is provided.

Global economic conditions

The challenging economic environment has not had, nor do we anticipate that it will have, a significant impact on our liquidity. Due to our operating cash flows, financial assets, access to capital markets and available lines of credit and revolving credit agreements, we continue to believe that we have the ability to meet our liquidity needs for the foreseeable future. As markets change, we continue to monitor our liquidity position. There can be no assurance that a challenging economic environment or a further economic downturn would not impact our ability to obtain financing in the future.

Debt

On September 12, 2017, we issued $1.25 billion aggregate principal amount of our senior notes (2017 senior notes), with an original issue discount of $7 million. These notes are comprised of $750 million aggregate principal amount of 3.000% senior notes due 2027 and $500 million aggregate principal amount of 3.950% senior notes due 2047. Net proceeds from this offering were partially used in October 2017 to repay, prior to maturity, the aggregate principal amount of$750 million, and a make-whole amount and accrued interest of $4 million, of our 1.875% senior notes due 2018. The remainder of the net proceeds will be used for general corporate purposes.

On November 13, 2015, we issued $1.25 billion aggregate principal amount of our senior notes (2015 senior notes), with an original issue discount of $2 million. On January 28, 2013, we issued $3.65 billion aggregate principal amount of our senior notes (2013 senior notes) in a private placement, with an original issue discount of $10 million.

The 2013, 2015 and 2017 senior notes are governed by an indenture and supplemental indenture (collectively, the indenture) between us and Deutsche Bank Trust Company Americas, as trustee. The indenture contains certain covenants, including limitations on our and certain of our subsidiaries' ability to incur liens or engage in sale lease-back transactions. The indenture also contains restrictions on our ability to consolidate, merge or sell substantially all of our assets. In addition, the indenture contains other customary terms, including certain events of default, upon the occurrence of which (if not cured or waived), the 2013, 2015 and 2017 senior notes may be declared immediately due and payable.

Pursuant to the indenture, we are able to redeem the 2013, 2015 and 2017 senior notes of any series, in whole or in part, at any time by paying a “make whole” premium, plus accrued and unpaid interest to, but excluding, the date of redemption. Pursuant to our tax matters agreement with Pfizer, we will not be permitted to redeem the 2013 senior notes due 2023 pursuant to this optional redemption provision, except under limited circumstances. Upon the occurrence of a change of control of us and a downgrade of the 2013, 2015 and 2017 senior notes below an investment grade rating by each of Moody's Investors Service, Inc. and Standard & Poor's Ratings Services, we are, in certain circumstances, required to make an offer to repurchase all of the outstanding 2013, 2015 and 2017 senior notes at a price equal to 101% of the aggregate principal amount of the 2013, 2015 and 2017 senior notes together with accrued and unpaid interest to, but excluding, the date of repurchase.

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The components of our long-term debt, including current portion of long-term debt, follow:

Description	Principal Amount	Interest Rate	Terms
2015 Senior Note due 2020	$500 million	3.450%	Interest due semi annually, not subject to amortization, aggregate principal due on November 13, 2020
2013 Senior Note due 2023	$1,350 million	3.250%	Interest due semi annually, not subject to amortization, aggregate principal due on February 1, 2023
2015 Senior Note due 2025	$750 million	4.500%	Interest due semi annually, not subject to amortization, aggregate principal due on November 13, 2025
2017 Senior Note due 2027	$750 million	3.000%	Interest due semi annually, not subject to amortization, aggregate principal due on September 12, 2027
2013 Senior Note due 2043	$1,150 million	4.700%	Interest due semi annually, not subject to amortization, aggregate principal due on February 1, 2043
2017 Senior Note due 2047	$500 million	3.950%	Interest due semi annually, not subject to amortization, aggregate principal due on September 12, 2047

Credit Ratings

Two major corporate debt-rating organizations, Moody's and S&P, assign ratings to our short-term and long-term debt. A security rating is not a recommendation to buy, sell or hold securities and the rating is subject to revision or withdrawal at any time by the rating organization. Each rating should be evaluated independently of any other rating.

The following table provides the current ratings assigned by these rating agencies to our commercial paper and senior unsecured non-credit-enhanced long-term debt:

	Commercial
	Paper	Long-term Debt		Date of
Name of Rating Agency	Rating	Rating	Outlook	Last Action
Moody’s	P-2	Baa1	Stable	August 2017
S&P	A-2	BBB	Stable	December 2016

Share Repurchase Program

In December 2016, the company's Board of Directors authorized a $1.5 billion share repurchase program. Purchases of Zoetis shares may be made at the discretion of management, depending on market conditions and business needs. Share repurchases may be executed through various means, including open market or privately negotiated transactions. During the three months ended March 31, 2018, approximately 2 million shares were repurchased. As of March 31, 2018, there was approximately $810 million remaining under this authorization.

Off-balance sheet arrangements

In the ordinary course of business and in connection with the sale of assets and businesses, we may indemnify our counterparties against certain liabilities that may arise in connection with a transaction or that are related to activities prior to a transaction. These indemnifications typically pertain to environmental, tax, employee and/or product-related matters, and patent-infringement claims. If the indemnified party were to make a successful claim pursuant to the terms of the indemnification, we would be required to reimburse the loss. These indemnifications are generally subject to threshold amounts, specified claim periods and other restrictions and limitations. Historically, we have not paid significant amounts under these provisions and, as of March 31, 2018, or December 31, 2017, recorded amounts for the estimated fair value of these indemnifications are not significant.

New accounting standards

Recently Issued Accounting Standards Not Adopted as ofMarch 31, 2018.

In February 2018, the FASB issued an accounting standards update which permits companies to reclassify from accumulated other comprehensive income to retained earnings stranded tax effects resulting from the new federal corporate income tax rate. In the period of adoption, a company may choose to either apply the amendments retrospectively to each period in which the effect of the change in federal income tax rate is recognized or to apply the amendments in that reporting period. The provisions of the update are effective beginning January 1, 2019 for interim and annual periods, with early adoption permitted for any interim period after issuance of the update. We are currently assessing the timing of our adoption and do not expect that the new standard will have a significant impact on our consolidated financial statements.

In August 2017, the FASB issued an accounting standards update which amends the hedge accounting recognition and presentation requirements and allows for more hedging strategies to be eligible for hedge accounting. Recognition of periodic hedge effectiveness will no longer be required for cash flow and net investment hedges and companies may elect to perform subsequent hedge effectiveness assessments qualitatively. The update also clarifies that the change in fair value of a derivative must be recorded in the same income statement line item as the earnings effect of the hedged item and introduces additional disclosure requirements including cumulative basis adjustments for fair value hedges and the effect of hedging on individual income statement line items. The provisions of the update are effective beginning January 1, 2019 for interim and annual periods with early adoption permitted for any interim period after issuance of the update. We are currently assessing the timing of our adoption as well as the potential impact that the standard will have on our consolidated financial statements.

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In February 2016, the FASB issued an accounting standards update which requires lessees to recognize most leases on the balance sheet with a corresponding right of use asset. Leases will be classified as financing or operating which will drive the expense recognition pattern. For lessees, the income statement presentation and expense recognition pattern for financing and operating leases is similar to the current model for capital and operating leases, respectively. Companies may elect to exclude short-term leases. The update also requires additional disclosures that will better enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. We plan to adopt this guidance as of January 1, 2019, the required effective date, for annual and interim reporting periods. The new standard requires a modified retrospective adoption approach, at the beginning of the earliest comparative period presented in the financial statements. We have selected a lease accounting system and are currently evaluating our lease contracts, accounting policy elections, and the impact of adoption on our consolidated financial statements. While we do not expect adoption of the standard to have a significant impact on our Consolidated Statements of Income, the impact on the assets and liabilities within our Consolidated Balance Sheet may be material.

Forward-looking statements and factors that may affect future results

This report contains “forward-looking” statements. We generally identify forward-looking statements by using words such as “anticipate,” “estimate,” “could,” “expect,” “intend,” “project,” “plan,” “predict,” “believe,” “seek,” “continue,” “outlook,” “objective”, “target”, “may,” “might,” “will,” “should,” “can have,” “likely” or the negative version of these words or comparable words or by using future dates in connection with any discussion of future performance, actions or events.

In particular, forward-looking statements include statements relating to our 2018 financial guidance, future actions, business plans or prospects, prospective products, product approvals or products under development, product supply disruptions, R&D costs, timing and likelihood of success, future operating or financial performance, future results of current and anticipated products and services, strategies, sales efforts, expenses, production efficiencies, production margins, integration of acquired businesses, interest rates, tax rates, changes in tax regimes and laws, foreign exchange rates, growth in emerging markets, the outcome of contingencies, such as legal proceedings, plans related to share repurchases and dividends, our agreements with Pfizer, government regulation and financial results. These statements are not guarantees of future performance, actions or events. Forward-looking statements are subject to risks and uncertainties, many of which are beyond our control, and are based on potentially inaccurate assumptions. Among the factors that could cause actual results to differ materially from past results and future plans and projected future results are the following:

• emerging restrictions and bans on the use of antibacterials in food-producing animals;

• perceived adverse effects on human health linked to the consumption of food derived from animals that utilize our products;

• unanticipated safety, quality or efficacy concerns about our products;

• increased regulation or decreased governmental support relating to the raising, processing or consumption of food-producing animals;

• fluctuations in foreign exchange rates and potential currency controls;

• changes in tax laws and regulations;

• legal factors, including product liability claims, antitrust litigation and governmental investigations, including tax disputes, environmental concerns, commercial disputes and patent disputes with branded and generic competitors, any of which could preclude commercialization of products or negatively affect the profitability of existing products;

• failure to protect our intellectual property rights or to operate our business without infringing the intellectual property rights of others;

• an outbreak of infectious disease carried by animals;

• consolidation of our customers and distributors negatively affecting the pricing of our products;

• adverse weather conditions and the availability of natural resources;

• adverse global economic conditions;

• failure of our R&D, acquisition and licensing efforts to generate new products;

• the possible impact of competing products, including generic alternatives, on our products and our ability to compete against such products;

• quarterly fluctuations in demand and costs;

• governmental laws and regulations affecting domestic and foreign operations, including without limitation, tax obligations and changes affecting the tax treatment by the United States of income earned outside the United States that may result from pending and possible future proposals; and

• governmental laws and regulations affecting our interactions with veterinary healthcare providers.

However, there may also be other risks that we are unable to predict at this time. These risks or uncertainties may cause actual results to differ materially from those contemplated by a forward-looking statement. You should not put undue reliance on forward-looking statements. Forward-looking statements speak only as of the date on which they are made. We undertake no obligation to publicly update forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law or by the rules and regulations of the SEC. You are advised, however, to consult any further disclosures we make on related subjects in our Form 10-Q and 8-K reports and our other filings with

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the SEC. You should understand that it is not possible to predict or identify all such factors. Consequently, you should not consider the above to be a complete discussion of all potential risks or uncertainties.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk

A significant portion of our revenue and costs are exposed to changes in foreign exchange rates. In addition, our outstanding borrowings may be subject to risk from changes in interest rates and foreign exchange rates. The overall objective of our financial risk management program is to seek to minimize the impact of foreign exchange rate movements and interest rate movements on our earnings. We manage these financial exposures through operational means and by using certain financial instruments. These practices may change as economic conditions change.

Foreign exchange risk

Our primary net foreign currency translation exposures are the Australian dollar, Brazilian real, Canadian dollar, Chinese renminbi, euro, and U.K. pound. We seek to manage our foreign exchange risk, in part, through operational means, including managing same-currency revenue in relation to same-currency costs and same-currency assets in relation to same-currency liabilities.

Foreign exchange risk is also managed through the use of foreign currency forward-exchange contracts. These contracts are used to offset the potential earnings effects from mostly intercompany short-term foreign currency assets and liabilities that arise from operations.

Our financial instrument holdings at March 31, 2018, were analyzed to determine their sensitivity to foreign exchange rate changes. The fair values of these instruments were determined using Level 2 inputs. The sensitivity analysis of changes in the fair value of all foreign currency forward-exchange contracts at March 31, 2018, indicates that if the U.S. dollar were to appreciate against all other currencies by 10%, the fair value of these contracts would increase by $22 million, and if the U.S. dollar were to weaken against all other currencies by 10%, the fair value of these contracts would decrease by $29 million. For additional details, see Notes to Condensed Consolidated Financial Statements— Note 8B. Financial Instruments: Derivative Financial Instruments— Foreign Exchange Risk.

Interest rate risk

Our outstanding debt balances are predominantly fixed rate debt. While changes in interest rates will have no impact on the interest we pay on our fixed rate debt, interest on our commercial paper and revolving credit facility will be exposed to interest rate fluctuations. At March 31, 2018, there were no commercial paper borrowings outstanding and no outstanding principal balance under our revolving credit facility. See Notes to Condensed Consolidated Financial Statements— Note 8B. Financial Instruments: Derivative Financial Instruments— Interest Rate Risk.

Item 4. Controls and Procedures

Disclosure Controls and Procedures

An evaluation was carried out under the supervision and with the participation of the company's management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934). Based upon that evaluation as of March 31, 2018, the company's Chief Executive Officer and Chief Financial Officer concluded that the company's disclosure controls and procedures are effective at a reasonable level of assurance in alerting them in a timely manner to material information required to be disclosed in our periodic reports filed with the SEC.

Changes in Internal Control over Financial Reporting

During our most recent fiscal quarter, there has not been any change in our internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934) that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II — OTHER INFORMATION

Item 1. Legal Proceedings

The information required by this Item is incorporated herein by reference to Notes to Condensed Consolidated Financial Statements—Note 15. Commitments and Contingencies in Part I— Item 1, of this Quarterly Report on Form 10-Q.

Item 1A. Risk Factors

In addition to the other information set forth in this Form 10-Q, you should carefully consider the factors discussed in the "Our Operating Environment" and "Forward-Looking Statements and Factors That May Affect Future Results" sections of the MD&A and in Part I, Item 1A. "Risk Factors," of our 2017 Annual Report on Form 10-K, which could materially affect our business, financial condition, or future results and which are incorporated by reference herein. Set forth below are updates to certain of the risk factors disclosed in our 2017 Annual Report on Form 10-K.

Risks related to tax matters

The Company could be subject to changes in its tax rates, the adoption of new U.S. or foreign tax legislation or exposure to additional tax liabilities.

The multinational nature of our business subjects us to taxation in the United States and numerous foreign jurisdictions. Due to economic and political conditions, tax rates in various jurisdictions may be subject to significant change. The company’s future effective tax rates could be affected by changes in the mix of earnings in countries with differing statutory tax rates, changes in the valuation of deferred tax assets and liabilities, or changes in tax laws or their interpretation.

For example, the European Commission opened formal investigations to examine whether decisions by the tax authorities in certain European countries, including Belgium, comply with European Union rules on state aid. In the case of Belgium, the European Commission concluded on January 11, 2016, that the excess profits ruling violates the European Union’s state aid rules.

In addition, on June 20, 2016, the Member States of the European Union adopted the anti-tax-avoidance directive proposed on January 28, 2016, which is designed to provide uniform implementation of Base Erosion and Profits Shifting measures and other minimum taxation standards across Member States. The Member States are required to implement all components of the directive by January 1, 2020. Once enacted by the Member States, the results of the directive could have an impact on our effective tax rate. In October 2016, the European Union also introduced a proposal to impose a uniform set of rules on taxing corporate profits, known as the Common Consolidated Corporate Tax Base. This proposal is still under consideration and may have an impact to our effective tax rate.

On December 22, 2017, President Trump signed into law the Tax Cuts and Jobs Act (the Tax Act) effective January 1, 2018. Some notable provisions of the Tax Act include a reduction of the corporate income tax rate from 35% to 21%, and a change from a worldwide system with deferral to a territorial tax system, which includes a one-time mandatory deemed repatriation tax, payable over eight years, on certain undistributed earnings of non-U.S. subsidiaries. As of December 31, 2017, the cumulative amount of non-U.S. undistributed earnings was approximately $4.5 billion, which includes an allocation of non-U.S. undistributed earnings as a result of the separation from Pfizer on June 24, 2013. Pursuant to the Staff Accounting Bulletin published by the Securities and Exchange Commission on December 22, 2017, addressing the challenges in accounting for the effects of the Tax Act in the period of enactment, companies must report provisional amounts for those specific income tax effects of the Tax Act for which the accounting is incomplete but a reasonable estimate can be determined. Those provisional amounts will be subject to adjustment during a measurement period of up to one year from the enactment date. The company is currently in the process of evaluating the full impact of this new legislation on its consolidated financial statements, and in the fourth quarter of 2017 recorded a provisional net charge of $212 million related to the one-time mandatory deemed repatriation tax, partially offset by the remeasurement of the deferred tax assets and liabilities, as of the date of enactment, due to the reduction in the U.S. federal corporate tax rate. A measurement-period adjustment was recorded in the first quarter of 2018 as a decrease to income tax expense of $2 million. At this time, we are properly reflecting the provision for taxes on income using all current enacted global tax laws in every jurisdiction in which we operate.

On March 29, 2017, United Kingdom (UK) Prime Minister Theresa May formally notified the European Council of the UK’s intention to withdraw from the European Union, commonly referred to as “Brexit”, under Article 50 of the Treaty of Lisbon. The notice begins the two-year negotiation period to establish the withdrawal terms. If no agreement is reached after two years, the UK’s separation still becomes effective, unless the remaining European Union members unanimously agree to an extension. At this time, the impact of Brexit to our effective tax rate is uncertain.

In addition, our effective tax rate is subject to potential risks that various taxing authorities may challenge the pricing of our cross-border arrangements and subject us to additional tax, adversely impacting our effective tax rate and our tax liability. The company is also subject to the examination of its tax returns and other tax matters by the Internal Revenue Service and other tax authorities and governmental bodies. The company regularly assesses the likelihood of an adverse outcome resulting from these examinations to determine the adequacy of its provision for taxes. There can be no assurance as to the outcome of these examinations. If the company’s effective tax rates were to increase, particularly in the United States or other material foreign jurisdictions, or if the ultimate determination of the company’s taxes owed is for an amount in excess of amounts previously accrued, the company’s operating results, cash flows and financial condition could be adversely affected.

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Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table provides information with respect to the shares of the company’s common stock repurchased during the quarter ended

March 31, 2018:

	Issuer Purchases of Equity Securities
	Total Number of Shares Purchased(a)	Average Price Paid Per Share	Total Number of Shares Purchased as Part of Publicly Announced Programs(b)	Approximate Dollar Value of Shares that May Yet Be Purchased Under Plans or Programs
January 1 - January 31, 2018	633,029	$75.50	631,875	$952,419,571
February 1- February 28, 2018	771,194	$76.82	596,977	$907,396,902
March 1 - March 31, 2018	1,191,009	$83.21	1,167,098	$810,241,428
	2,595,232	$79.43	2,395,950	$810,241,428

^(a) The company repurchased 199,282 shares during the three-month period ended March 31, 2018, that were not part of the publicly announced share repurchase authorization. These shares were reacquired from employees to satisfy tax withholding requirements on the vesting of restricted shares from equity-based awards.

^(b)   In December 2016, the company's Board of Directors authorized the repurchase of up to $1.5 billion of our outstanding common stock.

Item 3. Defaults Upon Senior Securities

None

Item 4. Mine Safety Disclosures

None

Item 5. Other Information

None

Item 6. Exhibits

Exhibit 3.1	Restated Certificate of Incorporation of the Registrant, effective as of May 13, 2014 (incorporated by reference to
	Exhibit 3.1 to Zoetis Inc.'s Quarterly Report on Form 10-Q filed on November 10, 2014 (File No. 001-35797))
Exhibit 3.2	By-laws of the Registrant, amended and restated as of February 19, 2016 (incorporated by reference to Exhibit 3.2
	to Zoetis Inc.'s 2015 Annual Report on Form 10-K filed on February 24, 2016 (File No. 001-35797))
Exhibit 12	Computation of Ratio of Earnings to Fixed Charges
Exhibit 15	Accountants' Acknowledgment
Exhibit 31.1	Chief Executive Officer–Certification pursuant to Sarbanes-Oxley Act of 2002 Section 302
Exhibit 31.2	Chief Financial Officer–Certification pursuant to Sarbanes-Oxley Act of 2002 Section 302
Exhibit 32.1	Chief Executive Officer–Certification pursuant to Sarbanes-Oxley Act of 2002 Section 906
Exhibit 32.2	Chief Financial Officer–Certification pursuant to Sarbanes-Oxley Act of 2002 Section 906
EX-101.INS	INSTANCE DOCUMENT
EX-101.SCH	SCHEMA DOCUMENT
EX-101.CAL	CALCULATION LINKBASE DOCUMENT
EX-101.LAB	LABELS LINKBASE DOCUMENT
EX-101.PRE	PRESENTATION LINKBASE DOCUMENT
EX-101.DEF	DEFINITION LINKBASE DOCUMENT

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Zoetis Inc.
May 2, 2018	By:	/S/ JUAN RAMÓN ALAIX
		Juan Ramón Alaix
		Chief Executive Officer and Director
May 2, 2018	By:	/S/ GLENN DAVID
		Glenn David
		Executive Vice President and
		Chief Financial Officer

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EX-12

Exhibit 12

ZOETIS INC. AND SUBSIDIARIES

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES^(a) 

	Three Months Ended
	March 31,			Year Ended December 31,
(IN MILLIONS, EXCEPT RATIOS)	2018			2017			2016			2015		2014		2013
Determination of earnings:
Income before provision for taxes on income
and noncontrolling interests	$	417		$	1,525		$	1,228		$	545	$	820	$	690
Less: Net income/(loss) attributable to noncontrolling interests	(2		)	(2		)	(2		)	—		4		(1		)
Income attributable to Zoetis Inc.	419			1,527			1,230			545		816		691
Add: fixed charges	51			188			177			137		131		127
Total earnings as defined	$	470		$	1,715		$	1,407		$	682	$	947	$	818
Fixed charges:
Interest expense, net of capitalized interest(a)	$	47		$	175		$	166		$	124	$	117	$	113
Capitalized interest	2			4			3			4		4		3
Interest portion of rent expense(b)	2			9			8			9		10		11
Fixed charges	$	51		$	188		$	177		$	137	$	131	$	127
Ratio of earnings to fixed charges	9.2			9.1			7.9			5.0		7.2		6.4

^(a)  Interest expense includes amortization of debt discount and fees. Interest expense does not include interest related to uncertain tax positions.

^(b)  One-third of all rental expense is deemed to be interest, which we believe to be a conservative estimate of an interest factor in our leases.

EX-15

Exhibit 15

ACCOUNTANTS’ ACKNOWLEDGEMENT

May 2, 2018

Zoetis, Inc.

Parsippany, New Jersey

Re: Registration Statements (Nos. 333‑186367, 333-189573, and 333-200073) on Form S-8 and (No. 333-205777) on Form S-3

With respect to the subject registration statements, we acknowledge our awareness of the use therein of our report dated May 2, 2018 related to our review of consolidated interim financial information.

Pursuant to Rule 436 under the Securities Act of 1933 (the Act), such report is not considered part of a registration statement prepared or certified by an independent registered public accounting firm, or a report prepared or certified by an independent registered public accounting firm within the meaning of Sections 7 and 11 of the Act.

/s/ KPMG LLP

Short Hills, New Jersey

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TOSECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Juan Ramón Alaix, certify that:

1. I have reviewed this Quarterly Report of Zoetis Inc. on Form 10-Q for the period ending March 31, 2018 as filed with the Securities and Exchange Commission on the date hereof;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

May 2, 2018	By:	/s/ JUAN RAMÓN ALAIX
		Juan Ramón Alaix
		Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TOSECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Glenn David, certify that:

1. I have reviewed this Quarterly Report of Zoetis Inc. on Form 10-Q for the period ending March 31, 2018 as filed with the Securities and Exchange Commission on the date hereof;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

May 2, 2018	By:	/s/ GLENN DAVID
		Glenn David
		Executive Vice President and
		Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICERPURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TOSECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. §1350, I, Juan Ramón Alaix, Chief Executive Officer, hereby certify that, to the best of my knowledge, the Quarterly Report on Form 10-Q of Zoetis Inc. for the period ended March 31, 2018 (the "Report") (1) fully complies with Section 13(a) or 15(d) of the Securities and Exchange Act of 1934; and (2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Zoetis Inc.

May 2, 2018	By:	/s/ JUAN RAMÓN ALAIX
		Juan Ramón Alaix
		Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. §1350, I, Glenn David, Executive Vice President and Chief Financial Officer, hereby certify that, to the best of my knowledge, the Quarterly Report on Form 10-Q of Zoetis Inc. for the period ended March 31, 2018 (the “Report”) (1) fully complies with Section 13(a) or 15(d) of the Securities and Exchange Act of 1934; and (2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Zoetis Inc.

May 2, 2018	By:	/s/ GLENN DAVID
		Glenn David
		Executive Vice President and
		Chief Financial Officer

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 27, 2018
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	ZTS
Entity Registrant Name	Zoetis Inc.
Entity Central Index Key	0001555280
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity common Stock, Shares Outstanding		483,865,442

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2018	Apr. 02, 2017
Income Statement [Abstract]
Revenue		$ 1,366	$ 1,231
Costs and expenses:
Cost of Sales		447	443
Selling, general and administrative expenses		338	309
Research and development expenses		97	90
Amortization of intangible assets		23	22
Restructuring charges/(reversals) and certain acquisition-related costs		2	(1)
Interest expense, net of capitalized interest		47	41
Other (income)/deductions—net		(5)	(10)
Income before provision for taxes on income	[1]	417	337
Provision for taxes on income		67	98
Net income before allocation to noncontrolling interests		350	239
Less: Net (loss)/income attributable to noncontrolling interests		(2)	1
Net income attributable to Zoetis Inc.		$ 352	$ 238
Earnings per share attributable to Zoetis Inc. stockholders:
Basic (in dollars per share)		$ 0.72	$ 0.48
Diluted (in dollars per share)		$ 0.72	$ 0.48
Weighted-average common shares outstanding:
Basic (in shares)		485.9	492.4
Diluted (in shares)		489.8	495.3
Dividends paid per common share (in dollars per share)		$ 0.126	$ 0.105

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

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Apr. 02, 2017
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests		$ 350	$ 239
Other comprehensive income, net of taxes and reclassification adjustments:
Foreign currency translation adjustments, net		77	44
Benefit plans: Actuarial gains, net	[1]	0	2
Total other comprehensive income, net of tax		77	46
Comprehensive income before allocation to noncontrolling interests		427	285
Less: Comprehensive (loss)/income attributable to noncontrolling interests		(1)	1
Comprehensive income attributable to Zoetis Inc.		$ 428	$ 284

[1] Presented net of reclassification adjustments and tax impacts, which are not significant in any period presented. Reclassification adjustments related to benefit plans are generally reclassified, as part of net periodic pension cost, into Other (income)/deductions, beginning in the first quarter of 2018, and into Cost of sales, Selling, general and administrative expenses, and/or Research and development expenses, as appropriate, for periods prior to 2018, in the condensed consolidated statements of income.

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	[1]	$ 1,654	$ 1,564
Restricted cash		6	6
Accounts receivable, less allowance for doubtful accounts of $25 in 2018 and $25 in 2017		943	998
Inventories		1,441	1,427
Other current assets		229	228
Total current assets		4,267	4,217
Property, plant and equipment, less accumulated depreciation of $1,519 in 2018 and $1,471 in 2017		1,453	1,435
Goodwill		1,532	1,510
Identifiable intangible assets, less accumulated amortization		1,280	1,269
Noncurrent deferred tax assets		80	80
Other noncurrent assets		78	75
Total assets		8,690	8,586
Liabilities and Equity
Accounts payable		217	261
Dividends payable		61	61
Accrued expenses		419	432
Accrued compensation and related items		182	236
Income taxes payable		92	60
Other current liabilities		29	44
Total current liabilities		1,000	1,094
Long-term debt, net of discount and issuance costs		4,954	4,953
Noncurrent deferred tax liabilities		246	380
Other taxes payable		304	172
Other noncurrent liabilities		211	201
Total liabilities		6,715	6,800
Commitments and Contingencies
Stockholders' equity:
Preferred stock, $0.01 par value: 1,000,000,000 authorized, none issued		0	0
Common stock, $0.01 par value: 6,000,000,000 authorized; 501,891,243 and 501,891,243 shares issued; 484,724,245 and 486,130,461 shares outstanding at March 31, 2018, and December 31, 2017, respectively		5	5
Treasury stock, at cost, 17,166,998 and 15,760,782 shares of common stock at March 31, 2018, and December 31, 2017, respectively		(1,005)	(852)
Additional paid-in capital		990	1,013
Retained earnings		2,399	2,109
Accumulated other comprehensive loss		(429)	(505)
Total Zoetis Inc. equity		1,960	1,770
Equity attributable to noncontrolling interests		15	16
Total equity		1,975	1,786
Total liabilities and equity		$ 8,690	$ 8,586

[1] As of both March 31, 2018, and December 31, 2017, includes $6 million of restricted cash.

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (PARENTHETICAL) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts		$ 25	$ 25
Accumulated depreciation		$ 1,519	$ 1,471
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, shares authorized		1,000,000,000	1,000,000,000
Preferred stock, shares issued		0	0
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock, shares authorized		6,000,000,000	6,000,000,000
Common stock issued, shares	[1]	501,891,243	501,891,243
Common stock, shares outstanding		484,724,245	486,130,461
Treasury stock, shares	[1]	17,166,998	15,760,782

[1] Shares may not add due to rounding.

XML

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) $ in Millions		Total	Common Stock	[1]	Treasury Stock	[1]	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Equity Attributable to Noncontrolling Interests
Beginning balance at Dec. 31, 2016		$ 1,499	$ 5		$ (421)		$ 1,024	$ 1,477	$ (598)	$ 12
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		239						238		1
Other comprehensive income		46							46
Consolidation of a noncontrolling interest		13								13
Share-based compensation awards	[2]	14			36		(10)	(12)
Treasury stock acquired	[3]	(125)			(125)
Employee benefit plan contribution from Pfizer Inc.	[4]	1					1
Dividends declared		(52)						(52)
Ending balance at Apr. 02, 2017		1,635	5		(510)		1,015	1,651	(552)	26
Beginning balance at Dec. 31, 2017		1,786	5		(852)		1,013	2,109	(505)	16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		350						352		(2)
Other comprehensive income		77							76	1
Share-based compensation awards	[2]	12			37		(24)	(1)
Treasury stock acquired	[3]	(190)			(190)
Employee benefit plan contribution from Pfizer Inc.	[4]	1					1
Dividends declared		(61)						(61)
Ending balance at Mar. 31, 2018		$ 1,975	$ 5		$ (1,005)		$ 990	$ 2,399	$ (429)	$ 15

[1] As of March 31, 2018, and April 2, 2017, there were 484,724,245 and 491,328,479 outstanding shares of common stock, respectively, and 17,166,998 and 10,562,764 shares of treasury stock, respectively. Treasury stock is recognized at the cost to reacquire the shares. For additional information, see Note 13. Stockholders' Equity.

[2] Includes the issuance of shares of Zoetis Inc. common stock and the reissuance of treasury stock in connection with the vesting of employee share-based awards. Upon reissuance of treasury stock, differences between the proceeds from reissuance and the cost of the treasury stock that result in gains are recorded in Additional paid-in capital. Losses are recorded in Additional paid-in capital to the extent that they can offset previously recorded gains. If no such credit exists, the differences are recorded in Retained earnings. Also includes the reacquisition of shares of treasury stock associated with the vesting of employee share-based awards to satisfy tax withholding requirements. For additional information, see Note 12. Share-Based Payments and Note 13. Stockholders' Equity.

[3] Reflects the acquisition of treasury shares in connection with the share repurchase program. For additional information, see Note 13. Stockholders' Equity.

[4] Represents contributed capital from Pfizer Inc. associated with service credit continuation for certain Zoetis Inc. employees in Pfizer Inc.'s U.S. qualified defined benefit and U.S. retiree medical plans. See Note 11. Benefit Plans.

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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) (PARENTHETICAL) - shares	Mar. 31, 2018		Dec. 31, 2017		Apr. 02, 2017	Oct. 02, 2016	[1]	Dec. 31, 2015	[1]
Statement of Stockholders' Equity [Abstract]
Common stock, shares outstanding	484,724,245		486,130,461		491,328,479
Treasury stock, shares	17,166,998	[1]	15,760,782	[1]	10,562,764	10,560,000		9,040,000

[1] Shares may not add due to rounding.

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018		Apr. 02, 2017
Operating Activities
Net income before allocation to noncontrolling interests		$ 350		$ 239
Adjustments to reconcile net income before noncontrolling interests to net cash provided by operating activities:
Depreciation and amortization expense	[1],[2]	60		62
Share-based compensation expense		11		11
Restructuring		2		(1)
Asset Impairment Charges		2		0
Provision for losses on inventory		16		16
Deferred taxes(a)	[3]	(141)		24
Employee benefit plan contribution from Pfizer Inc.		1		1
Other non-cash adjustments		3		4
Other changes in assets and liabilities, net of acquisitions and divestitures
Accounts receivable		60		(22)
Inventories		(33)		(52)
Other assets		(2)		(13)
Accounts payable		(46)		(37)
Other liabilities		(57)		(147)
Other tax accounts, net(a)	[3]	163		34
Net cash provided by operating activities		389		119
Investing Activities
Purchases of property, plant and equipment		(53)		(42)
Acquisitions		0		(3)
Net proceeds from sales of assets		8		0
Other investing activities		0		(3)
Net cash used in investing activities		(45)		(48)
Financing Activities
Payment of contingent consideration related to previously acquired assets		(12)		(5)
Share-based compensation-related proceeds, net of taxes paid on withholding shares		2		6
Purchases of treasury stock		(190)		(125)
Cash dividends paid		(62)		(52)
Net cash used in financing activities		(262)		(176)
Effect of exchange-rate changes on cash and cash equivalents		8		7
Net increase/(decrease) in cash and cash equivalents		90		(98)
Cash and cash equivalents at beginning of period		1,564	[4]	727
Cash and cash equivalents at end of period		1,654	[4]	629
Cash paid during the period for:
Income taxes		42		37
Interest, net of capitalized interest		70		56
Non-cash transactions:
Purchases of property, plant and equipment		1		4
Contingent purchase price consideration	[5]	0		2
Dividends Payable		$ 61		$ 52

[1] Certain production facilities are shared. Depreciation and amortization is allocated to the reportable operating segments based on estimates of where the benefits of the related assets are realized.

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

[3] Reflects the reclassification of the one-time mandatory deemed repatriation tax from Noncurrent deferred tax liabilities to Income taxes payable and Other taxes payable to properly reflect the liability, which became a fixed obligation in 2018 payable over eight years.

[4] As of both March 31, 2018, and December 31, 2017, includes $6 million of restricted cash.

[5] For 2017, relates primarily to the consolidation of a European livestock monitoring company a variable interest entity of which Zoetis is the primary beneficiary.

XML

Basis of Presentation

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements were prepared following the requirements of the Securities and Exchange Commission (SEC) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by accounting principles generally accepted in the United States of America (U.S. GAAP) can be condensed or omitted. Balance sheet amounts and operating results for subsidiaries operating outside the United States are as of and for the three-month periods ended February 28, 2018, and February 26, 2017.

Prior to fiscal 2018, the company followed a 13-week quarterly accounting cycle for each of the first three fiscal quarters. The company's fiscal year ends on December 31 for our operations in the United States and on November 30 for subsidiaries operating outside the United States. Beginning in fiscal 2018, the company's first three fiscal quarters will end on the last day of March, June and September in the United States and the last day of February, May and August for subsidiaries operating outside the United States. There is no change to the company's fiscal year-end dates. We did not adjust our results of operations for periods prior to 2018 as the impact was not material.

Revenue, expenses, assets and liabilities can vary during each quarter of the year. Therefore, the results and trends in these interim financial statements may not be representative of those for the full year.

We are responsible for the unaudited condensed consolidated financial statements included in this Form 10-Q. The condensed consolidated financial statements include all normal and recurring adjustments that are considered necessary for the fair presentation of our financial position and operating results. The information included in this interim report should be read in conjunction with the financial statements and accompanying notes included in our 2017 Annual Report on Form 10-K.

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Organization

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

Organization

Zoetis Inc. (including its subsidiaries, collectively, Zoetis, the company, we, us or our) is a global leader in the discovery, development, manufacture and commercialization of animal health medicines and vaccines, with a focus on both livestock and companion animals. We organize and operate our business in two geographic regions: the United States (U.S.) and International.

We directly market our products in approximately 45 countries across North America, Europe, Africa, Asia, Australia and South America. Our products are sold in more than 100 countries, including developed markets and emerging markets. We have a diversified business, marketing products across eight core species: cattle, swine, poultry, sheep and fish (collectively, livestock) and dogs, cats and horses (collectively, companion animals); and within five major product categories: anti-infectives, vaccines, parasiticides, medicated feed additives and other pharmaceuticals.

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Accounting Standards

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Accounting Standards

Accounting Standards

Recently Adopted Accounting Standards

In March 2018, the Financial Accounting Standards Board (FASB) issued an accounting standards update to align existing guidance on accounting for income taxes, pursuant to guidance provided by a Staff Accounting Bulletin published by the SEC on December 22, 2017. The update addresses the challenges in accounting for the effects of the Tax Cuts and Jobs Act (the Tax Act), enacted on December 22, 2017, in the period of enactment and required companies to report provisional amounts for those specific income tax effects of the Tax Act for which the accounting is incomplete but a reasonable estimate can be determined. Provisional amounts will be subject to adjustment during a measurement period of up to one year from the enactment date. For additional information, see Note 7. Tax Matters.

In March 2017, the FASB issued an accounting standards update to simplify and improve the reporting of net periodic pension benefit cost by requiring only present service cost to be presented in the same line item as other current employee compensation costs while remaining components of net periodic benefit cost would be presented within Other (income)/deductions—net outside of operations. We adopted this guidance as of January 1, 2018, the required effective date. The new standard did not have a significant impact on our consolidated financial statements.

In October 2016, the FASB issued an accounting standards update that requires the recognition of the income tax consequences of an intra-entity asset transfer, other than inventory, when the transfer occurs as opposed to when the asset is sold to an outside third party. We adopted this guidance as of January 1, 2018, the required effective date. The new standard did not have a significant impact on our consolidated financial statements.

In May 2014, the FASB issued an accounting standards update that outlines a new, single comprehensive model for companies to use in accounting for revenue arising from contracts with customers. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. We adopted this guidance as of January 1, 2018, the required effective date, using the modified retrospective adoption method. Prior period amounts have not been adjusted and continue to be reported in accordance with our historic accounting policies. Application of the standard using the modified retrospective method did not require an adjustment to opening retained earnings. For additional information, see Note 4. Revenue.

Recently Issued Accounting Standards

In February 2018, the FASB issued an accounting standards update which permits companies to reclassify from accumulated other comprehensive income to retained earnings stranded tax effects resulting from the new federal corporate income tax rate. In the period of adoption, a company may choose to either apply the amendments retrospectively to each period in which the effect of the change in federal income tax rate is recognized or to apply the amendments in that reporting period. The provisions of the update are effective beginning January 1, 2019 for interim and annual periods, with early adoption permitted for any interim period after issuance of the update. We are currently assessing the timing of our adoption and do not expect that the new standard will have a significant impact on our consolidated financial statements.

In August 2017, the FASB issued an accounting standards update which amends the hedge accounting recognition and presentation requirements and allows for more hedging strategies to be eligible for hedge accounting. Recognition of periodic hedge effectiveness will no longer be required for cash flow and net investment hedges and companies may elect to perform subsequent hedge effectiveness assessments qualitatively. The update also clarifies that the change in fair value of a derivative must be recorded in the same income statement line item as the earnings effect of the hedged item and introduces additional disclosure requirements including cumulative basis adjustments for fair value hedges and the effect of hedging on individual income statement line items. The provisions of the update are effective beginning January 1, 2019 for interim and annual periods with early adoption permitted for any interim period after issuance of the update. We are currently assessing the timing of our adoption as well as the potential impact that the standard will have on our consolidated financial statements.

In February 2016, the FASB issued an accounting standards update which requires lessees to recognize most leases on the balance sheet with a corresponding right of use asset. Leases will be classified as financing or operating which will drive the expense recognition pattern. For lessees, the income statement presentation and expense recognition pattern for financing and operating leases is similar to the current model for capital and operating leases, respectively. Companies may elect to exclude short-term leases. The update also requires additional disclosures that will better enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. We plan to adopt this guidance as of January 1, 2019, the required effective date, for annual and interim reporting periods. The new standard requires a modified retrospective adoption approach, at the beginning of the earliest comparative period presented in the financial statements. We have selected a lease accounting system and are currently evaluating our lease contracts, accounting policy elections, and the impact of adoption on our consolidated financial statements. While we do not expect adoption of the standard to have a significant impact on our consolidated statements of income, the impact on the assets and liabilities within our consolidated balance sheet may be material.

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Revenue

3 Months Ended

Mar. 31, 2018

Revenue Recognition and Deferred Revenue [Abstract]

Revenue

Revenue

A. Revenue from Product Sales

We offer a diversified portfolio of products which allows us to capitalize on local and regional customer needs. Generally, our products are promoted to veterinarians and livestock producers by our sales organization which includes sales representatives and technical and veterinary operations specialists, and then sold directly by us or through distributors. The depth of our product portfolio enables us to address the varying needs of customers in different species and geographies. Many of our top selling product lines are distributed across both of our operating segments, leveraging our R&D operations and manufacturing and supply chain network.

Over the course of our history, we have focused on developing a diverse portfolio of animal health products, including medicines and vaccines, complemented by biodevices, diagnostics, and genetics. We refer to a single product in all brands, or its dosage forms for all species, as a product line. We have approximately 300 comprehensive product lines, including products for both livestock and companion animals across each of our major product categories.

Our major product categories are:

• vaccines: biological preparations that help prevent diseases of the respiratory, gastrointestinal and reproductive tracts or induce a specific immune response;

• anti-infectives: products that prevent, kill or slow the growth of bacteria, fungi or protozoa;

• other pharmaceutical products: allergy and dermatology, pain and sedation, antiemetic, reproductive, and oncology products;

• parasiticides: products that prevent or eliminate external and internal parasites such as fleas, ticks and worms; and

• medicated feed additives: products added to animal feed that provide medicines to livestock.

Our livestock products primarily help prevent or treat diseases and conditions to enable the cost-effective production of safe, high-quality animal protein. Human population growth and increasing standards of living are important long-term growth drivers for our livestock products in three major ways. First, population growth and increasing standards of living drive increased demand for improved nutrition, particularly animal protein. Second, population growth leads to increased natural resource constraints driving a need for enhanced productivity. Finally, as standards of living improve, there is increased focus on food quality and safety.

Our companion animal products help extend and improve the quality of life for pets; increase convenience and compliance for pet owners; and help veterinarians improve the quality of their care and the efficiency of their businesses. Growth in the companion animal medicines and vaccines sector is driven by economic development, related increases in disposable income and increases in pet ownership and spending on pet care. Companion animals are also living longer, receiving increased medical treatment and benefiting from advances in animal health medicines and vaccines.

The following tables present our revenue disaggregated by geographic area, species, and major product category.

Revenue by geographic area

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
United States	$	634	$	605
Australia	48		40
Brazil	70		66
Canada	40		34
China	64		52
France	33		29
Germany	38		28
Italy	27		22
Japan	41		34
Mexico	24		18
Spain	25		20
United Kingdom	52		43
Other developed markets	79		68
Other emerging markets	185		161
	1,360		1,220
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

Revenue by major species

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
U.S.
Livestock	$	292	$	282
Companion Animal	342		323
	634		605
International
Livestock	478		421
Companion Animal	248		194
	726		615
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

Revenue by species

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Livestock:
Cattle	$	416	$	386
Swine	175		160
Poultry	136		116
Fish	22		21
Other	21		20
	770		703
Companion Animal:
Dogs and Cats	549		482
Horses	41		35
	590		517
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

Revenue by major product category

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Vaccines	$	356	$	319
Anti-infectives	297		268
Other pharmaceuticals	319		272
Parasiticides	191		184
Medicated feed additives	137		123
Other non-pharmaceuticals	60		54
	1,360		1,220
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

B.    Revenue Accounting Policy

Below are the significant accounting policies updated as of January 1, 2018 as a result of the adoption of the new revenue recognition guidance. For additional information, see Note 3. Accounting Standards.

We recognize revenue from product sales when control of the goods has transferred to the customer, which is typically once the goods have shipped and the customer has assumed title.Revenue reflects the total consideration to which we expect to be entitled (i.e. the transaction price), in exchange for products sold, after considering various types of variable consideration including rebates, sales allowances, product returns and discounts.

Variable consideration is estimated and recorded at the time that related revenue is recognized. Our estimates reflect the amount by which we expect variable consideration to impact revenue recognized and are generally based on contractual terms or historical experience, adjusted as necessary to reflect our expectations about the future. Our customer payment terms generally range from 60 to 90 days.

Estimates of variable consideration utilize a complex series of judgments and assumptions to determine the amount by which we expect revenue to be reduced, for example;

• for sales returns, we perform calculations in each market that incorporate the following, as appropriate: local returns policies and practices; historic returns as a percentage of revenue; estimated shelf life by product; an estimate of the amount of time between shipment and return or lag time; and any other factors that could impact the estimate of future returns, product recalls, discontinuation of products or a changing competitive environment; and

• for revenue incentives, we use our historical experience with similar incentives programs to estimate the impact of such programs on revenue for the current period.

Although the amounts recorded for these revenue deductions are dependent on estimates and assumptions, historically our adjustments to actual results have not been material. The sensitivity of our estimates can vary by program, type of customer and geographic location.

A deferral of revenue may be required in the event that we have not satisfied all customer obligations for which we have been compensated. The transaction price is allocated to the individual performance obligations on the basis of relative stand-alone selling price, which is typically based on actual sales prices. Revenue associated with unsatisfied performance obligations are contract liabilities, is recorded within Other current liabilities, and is recognized once control of the underlying products has transferred to the customer. Contract liabilities reflected within Other current liabilities as of the adoption date and subsequently recognized as revenue during the first quarter of 2018 were approximately $2 million. Contract liabilities as of March 31, 2018 were approximately $4 million.

We do not disclose the transaction price allocated to unsatisfied performance obligations related to contracts with an original expected duration of one year or less, or for contracts for which we recognize revenue in line with our right to invoice the customer. Estimated future revenue expected to be generated from long-term contracts with unsatisfied performance obligations as of March 31, 2018 are not material.

Taxes collected from customers relating to product sales and remitted to governmental authorities are excluded from Revenue. Shipping and handling costs incurred after control of the purchased product has transferred to the customer are accounted for as a fulfillment cost, within Selling, general and administrative expenses.

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Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives

3 Months Ended

Mar. 31, 2018

Restructuring and Related Activities [Abstract]

Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives

Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives

In connection with our cost-reduction/productivity initiatives, we typically incur costs and charges associated with site closings and other facility rationalization actions, workforce reductions and the expansion of shared services, including the development of global systems. In connection with our acquisition activity, we typically incur costs and charges associated with executing the transactions, integrating the acquired operations, which may include expenditures for consulting and the integration of systems and processes, product transfers and restructuring the consolidated company, which may include charges related to employees, assets and activities that will not continue in the consolidated company. All operating functions can be impacted by these actions, including sales and marketing, manufacturing and research and development (R&D), as well as functions such as business technology, shared services and corporate operations.

During 2015, we launched a comprehensive operational efficiency program, which was incremental to the previously announced supply network strategy. These initiatives focused on reducing complexity in our product portfolios, changing our selling approach in certain markets, reducing our presence in certain countries, and exiting manufacturing sites over a long term period. We have also continued to optimize our resource allocation and efficiency by reducing resources associated with non-customer facing activities and operating more efficiently as a result of less internal complexity and more standardization of processes. As part of these initiatives, we planned to reduce certain positions through divestitures, normal attrition and involuntary terminations by approximately 2,800, subject to consultations with works councils and unions in certain countries. Including divestitures, as of March 31, 2018, approximately 2,600 positions have been eliminated related to these initiatives. The comprehensive operational efficiency program was substantially completed as of December 31, 2017. We expect to complete the supply network strategy over the next several years.

The components of costs incurred in connection with restructuring initiatives, acquisitions and cost-reduction/productivity initiatives are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Restructuring charges/(reversals) and certain acquisition-related costs:
Integration costs(a)	$	1	$	—
Restructuring charges/(reversals)(b)(c):
Employee termination costs/(reversals)	1		(1		)
Total Restructuring charges/(reversals) and certain acquisition-related costs	$	2	$	(1	)

^(a)  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.

^(b)  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.

^(c)  The restructuring charges/(reversals) are associated with the following:

• For the three months endedMarch 31, 2018, Manufacturing/research/corporate ($1 million).

• For the three months endedApril 2, 2017, U.S. ($1 million) and International ($2 million reversal).

Charges related to the operational efficiency initiative and supply network strategy are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Restructuring charges/(reversals) and certain acquisition-related costs:
Operational efficiency initiative
Employee termination costs	$	—	$	(1	)
	—		(1		)
Supply network strategy:
Employee termination costs	1		—
	1		—
Total restructuring charges/(reversals) related to the operational efficiency initiative and supply network strategy	1		(1		)
Other supply network strategy charges
Cost of sales:
Accelerated depreciation	—		1
Consulting fees	1		2
Total other supply network strategy charges	1		3
Total charges associated with the operational efficiency initiative and supply network strategy	$	2	$	2

The components of, and changes in, our restructuring accruals are as follows:

(MILLIONS OF DOLLARS)	Accrual(a)
Balance, December 31, 2017(b)	$	41
Provision	1
Utilization and other(c)	(7		)
Balance, March 31, 2018(b)	$	35

^(a)   Changes in our restructuring accruals represent employee termination costs.

^(b)  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).

^(c)   Includes adjustments for foreign currency translation.

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Other (Income)/Deductions - Net

3 Months Ended

Mar. 31, 2018

Other Income and Expenses [Abstract]

Other (Income)/Deductions - Net

Other (Income)/Deductions—Net

The components of Other (income)/deductions—net are as follows:

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS)	2018			2017
Royalty-related income	$	(7	)	$	(7	)
Foreign currency loss(a)	8			2
Other, net(b)	(6		)	(5		)
Other (income)/deductions—net	$	(5	)	$	(10	)

^(a)  Primarily driven by costs related to hedging and exposures to certain emerging market currencies.

^(b)  For the three months endedMarch 31, 2018, primarily includes interest income and other miscellaneous income. For the three months endedApril 2, 2017, primarily includes a settlement refund and reimbursement of legal fees related to costs incurred by Pharmaq prior to the acquisition in 2015, as well as interest income and other miscellaneous income.

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Income Taxes

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

A. Taxes on Income

On December 22, 2017, the Tax Act was enacted which, among other changes, reduced the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018. The Tax Act made broad and complex changes to the U.S. tax code and it will take time to fully analyze the impact of the changes. Based on the information available at that time, and the current interpretation of the Tax Act, for the year ended December 31, 2017 the company was able to make a reasonable estimate and recorded an initial provisional net tax expense of $212 million related to the one-time mandatory deemed repatriation tax, payable over eight years, partially offset by the remeasurement of the deferred tax assets and liabilities, as of the date of enactment, due to the reduction in the U.S. federal corporate tax rate. Pursuant to the Staff Accounting Bulletin published by the SEC on December 22, 2017, addressing the challenges in accounting for the effects of the Tax Act in the period of enactment, companies must report provisional amounts for those specific income tax effects of the Tax Act for which the accounting is incomplete but a reasonable estimate can be determined. Those provisional amounts will be subject to adjustment during a measurement period of up to one year from the enactment date (measurement-period adjustment). Pursuant to this guidance, the estimated impact of the Tax Act was based on a preliminary review of the new tax law and projected future financial results and is subject to revision based upon further analysis and interpretation of the Tax Act and to the extent that future results differ from currently available projections.

Our accounting for the following elements of the Tax Act is incomplete. However, we were able to further refine our initial reasonable estimate and adjusted the initial provisional net tax expense of $212 million and recorded the following measurement-period adjustments during the first quarter of 2018:

• One-Time Mandatory Deemed Repatriation Tax: The one-time mandatory deemed repatriation tax is a tax on certain previously untaxed accumulated and current earnings and profits (E&P) of our foreign subsidiaries. We were able to reasonably estimate the one-time mandatory deemed repatriation tax and recorded an initial provisional tax obligation, with a corresponding adjustment to income tax expense for the year ended December 31, 2017. We are continuing to gather additional information to more precisely compute the amount of the one-time mandatory deemed repatriation tax, and our accounting for this item is not yet complete due to the fact that the non-U.S. subsidiaries are on a fiscal year ending November 30, and this tax liability will not become a fixed obligation until November 30, 2018. The estimated impact of the Tax Act is based on a preliminary review of the new law and projected future financial results and is subject to revision based upon further analysis and interpretation of the Tax Act and to the extent that future results differ from currently available projections. However, on the basis of revised E&P computations that were calculated during the reporting period, we recognized a measurement-period adjustment of $2 million as a decrease to the one-time mandatory deemed repatriation tax obligation, with a corresponding adjustment to income tax benefit during the period. The effect of the measurement-period adjustment to the first quarter 2018 effective tax rate was a reduction to the rate of approximately 0.6%. In addition, we reclassified the one-time mandatory deemed repatriation tax from Noncurrent deferred tax liabilities to Income taxes payable and Other taxes payable. We expect to complete our accounting within the prescribed measurement period.

• Reduction of U.S. Federal Corporate Tax Rate: The Tax Act reduced the corporate tax rate to 21%, effective January 1, 2018. Consequently, we recorded a decrease related to deferred tax assets and liabilities with a corresponding net adjustment to deferred income tax benefit for the year ended December 31, 2017. We have not made any measurement-period adjustments related to this item during the first quarter of 2018. Since the company has recorded provisional amounts related to certain portions of the Tax Act, any corresponding deferred tax remeasurement is also provisional. However, we are continuing to gather additional information to complete our accounting for this item and expect to be completed within the prescribed measurement period.

• Valuation Allowances: The company must assess whether its valuation allowance analyses are affected by the various aspects of the Tax Act (e.g., one-time mandatory deemed repatriation of deferred foreign income, global intangible low-taxed income inclusions, and new categories of foreign tax credits). We have not made any measurement-period adjustments related to this item during the first quarter of 2018. Since the company has recorded provisional amounts related to certain portions of the Tax Act, any corresponding determination of the need for or change in a valuation allowance is also provisional. However, we are continuing to gather additional information to complete our accounting for this item and expect to be completed within the prescribed measurement period.

• Global Intangible Low-Taxed Income (GILTI) Policy Election: The GILTI provisions of the Tax Act do not apply to the company until 2019, due to the fact that the non-U.S. subsidiaries are on a fiscal year ending November 30, and we are still evaluating its impact. The FASB allows companies to adopt an accounting policy to either recognize deferred taxes for GILTI or treat such tax cost as a current-period expense when incurred. We have not yet determined our accounting policy because determining the impact of the GILTI provisions requires analysis of our existing legal entity structure, the reversal of our U.S. GAAP and U.S. tax basis differences in the assets and liabilities of our foreign subsidiaries, and our ability to offset any tax with foreign tax credits. As such, we have not made a policy decision whether to record deferred taxes on GILTI or treat such tax cost as a current-period expense.

The effective tax rate was 16.1% for the three months ended March 31, 2018, compared with 29.1% for the three months ended April 2, 2017. The lower effective tax rate for the three months ended March 31, 2018, was primarily attributable to:

• the reduction of the U.S. federal corporate income tax rate from 35% to 21%, effective January 1, 2018, pursuant to the Tax Act;

• changes in the jurisdictional mix of earnings, which includes the impact of the location of earnings from operations and repatriation costs. The jurisdictional mix of earnings can vary as a result of repatriation decisions and operating fluctuations in the normal course of business and the impact of non-deductible items;

• an $8 million and $5 million discrete tax benefit recorded in the first quarter of 2018 and 2017, respectively, related to the excess tax benefits for share-based payments;

• an $8 million and $3 million discrete tax benefit recorded in the first quarter of 2018 and 2017, respectively, related to a remeasurement of deferred taxes as a result of a change in non-U.S. statutory tax rates; and

• a $2 million net discrete tax benefit recorded in the first quarter of 2018, associated with a measurement-period adjustment related to the provisional one-time mandatory deemed repatriation tax on the company's undistributed non-U.S. earnings pursuant to the Tax Act enacted on December 22, 2017.

B. Deferred Taxes

As of March 31, 2018, the total net deferred income tax liability of $166 million is included in Noncurrent deferred tax assets ($80 million) and Noncurrent deferred tax liabilities ($246 million).

As of December 31, 2017, the total net deferred income tax liability of $300 million is included in Noncurrent deferred tax assets ($80 million) and Noncurrent deferred tax liabilities ($380 million).

The change in Noncurrent deferred tax liabilities was primarily due to the reclassification of the one-time mandatory deemed repatriation tax from Noncurrent deferred tax liabilities to Income taxes payable and Other taxes payable to properly reflect the liability, which became a fixed obligation in 2018 payable over eight years.

C. Tax Contingencies

As of March 31, 2018, the tax liabilities associated with uncertain tax positions of $191 million (exclusive of interest and penalties related to uncertain tax positions of $12 million) are included in Noncurrent deferred tax assets ($4 million) and Other taxes payable ($187 million).

As of December 31, 2017, the tax liabilities associated with uncertain tax positions of $164 million (exclusive of interest and penalties related to uncertain tax positions of $11 million) are included in Noncurrent deferred tax assets ($3 million) and Other taxes payable ($161 million).

Our tax liabilities for uncertain tax positions relate primarily to issues common among multinational corporations. Any settlements or statute of limitations expirations could result in a significant decrease in our uncertain tax positions. Substantially all of these unrecognized tax benefits, if recognized, would impact our effective income tax rate. We do not expect that within the next twelve months any of our uncertain tax positions could significantly decrease as a result of settlements with taxing authorities or the expiration of the statutes of limitations. Our assessments are based on estimates and assumptions that have been deemed reasonable by management, but our estimates of uncertain tax positions and potential tax benefits may not be representative of actual outcomes, and any variation from such estimates could materially affect our financial statements in the period of settlement or when the statutes of limitations expire, as we treat these events as discrete items in the period of resolution. Finalizing audits with the relevant taxing authorities can include formal administrative and legal proceedings, and, as a result, it is difficult to estimate the timing and range of possible changes related to our uncertain tax positions, and such changes could be significant.

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Financial Instruments

3 Months Ended

Mar. 31, 2018

Financial Instruments [Abstract]

Financial Instruments

Financial Instruments

A. Debt

Credit Facilities

In December 2016, we entered into an amended and restated revolving credit agreement with a syndicate of banks providing for a five-year $1.0 billion senior unsecured revolving credit facility (the credit facility). In December 2017, the maturity for the amended and restated revolving credit agreement was extended through December 2022. Subject to certain conditions, we have the right to increase the credit facility to up to $1.5 billion. The credit facility contains a financial covenant requiring us to not exceed a maximum total leverage ratio (the ratio of consolidated net debt as of the end of the period to consolidated Earnings Before Interest, Income Taxes, Depreciation and Amortization (EBITDA) for such period) of 3.50:1. Upon entering into a material acquisition, the maximum total leverage ratio increases to 4.00:1, and extends until the fourth full consecutive fiscal quarter ended immediately following the consummation of a material acquisition. The credit facility also contains a clause which adds back to Adjusted Consolidated EBITDA, any operational efficiency restructuring charge (defined as charges recorded by the company during the period commencing on October 1, 2016 and ending December 31, 2019, related to operational efficiency initiatives), provided that for any twelve-month period such charges added back to Adjusted Consolidated EBITDA shall not to exceed $100 million in the aggregate.

The credit facility also contains a financial covenant requiring that we maintain a minimum interest coverage ratio (the ratio of EBITDA at the end of the period to interest expense for such period) of 3.50:1. In addition, the credit facility contains other customary covenants.

We were in compliance with all financial covenants as of March 31, 2018, and December 31, 2017. There were no amounts drawn under the credit facility as of March 31, 2018, or December 31, 2017.

We have additional lines of credit and other credit arrangements with a group of banks and other financial intermediaries for general corporate purposes. We maintain cash and cash equivalent balances in excess of our outstanding short-term borrowings. As of March 31, 2018, we had access to $71 million of lines of credit which expire at various times throughout 2018 and 2019 and are generally renewed annually. We did not have any borrowings outstanding related to these facilities as of March 31, 2018, and December 31, 2017.

Commercial Paper Program and Other Short-Term Borrowings

In February 2013, we entered into a commercial paper program with a capacity of up to $1.0 billion. As of March 31, 2018, and December 31, 2017, there was no commercial paper outstanding under this program. As of March 31, 2018, and December 31, 2017, we did not have any other short-term borrowings outstanding.

Senior Notes and Other Long-Term Debt

On September 12, 2017, we issued $1.25 billion aggregate principal amount of our senior notes (2017 senior notes), with an original issue discount of $7 million. These notes are comprised of $750 million aggregate principal amount of 3.000% senior notes due 2027 and $500 million aggregate principal amount of 3.950% senior notes due 2047. Net proceeds from this offering were partially used in October 2017 to repay, prior to maturity, the aggregate principal amount of $750 million, and a make-whole amount and accrued interest of $4 million, of our 1.875%senior notes due 2018. The remainder of the net proceeds will be used for general corporate purposes.

On November 13, 2015, we issued $1.25 billion aggregate principal amount of our senior notes (2015 senior notes), with an original issue discount of $2 million. On January 28, 2013, we issued $3.65 billion aggregate principal amount of our senior notes (the 2013 senior notes offering) in a private placement, with an original issue discount of $10 million.

The 2013, 2015 and 2017 senior notes are governed by an indenture and supplemental indenture (collectively, the indenture) between us and Deutsche Bank Trust Company Americas, as trustee. The indenture contains certain covenants, including limitations on our and certain of our subsidiaries' ability to incur liens or engage in sale-leaseback transactions. The indenture also contains restrictions on our ability to consolidate, merge or sell substantially all of our assets. In addition, the indenture contains other customary terms, including certain events of default, upon the occurrence of which the 2013, 2015 and 2017 senior notes may be declared immediately due and payable.

Pursuant to the indenture, we are able to redeem the 2013, 2015 and 2017 senior notes, in whole or in part, at any time by paying a “make whole” premium, plus accrued and unpaid interest to, but excluding, the date of redemption. Pursuant to our tax matters agreement with Pfizer, we will not be permitted to redeem the 2013 senior notes due 2023 pursuant to this optional redemption provision, except under limited circumstances. Upon the occurrence of a change of control of us and a downgrade of the 2013, 2015 and 2017 senior notes below an investment grade rating by each of Moody's Investors Service, Inc. and Standard & Poor's Ratings Services, we are, in certain circumstances, required to make an offer to repurchase all of the outstanding 2013, 2015 and 2017 senior notes at a price equal to 101% of the aggregate principal amount of the 2013, 2015 and 2017 senior notes together with accrued and unpaid interest to, but excluding, the date of repurchase.

The components of our long-term debt are as follows:

	March 31,			December 31,
(MILLIONS OF DOLLARS)	2018			2017
3.450% 2015 senior notes due 2020	$	500		$	500
3.250% 2013 senior notes due 2023	1,350			1,350
4.500% 2015 senior notes due 2025	750			750
3.000% 2017 senior notes due 2027	750			750
4.700% 2013 senior notes due 2043	1,150			1,150
3.950% 2017 senior notes due 2047	500			500
	5,000			5,000
Unamortized debt discount / debt issuance costs	(46		)	(47		)
Long-term debt, net of discount and issuance costs	$	4,954		$	4,953

The fair value of our long-term debt was $5,083 million and $5,291 million as of March 31, 2018, and December 31, 2017, respectively, and has been determined using a third-party matrix-pricing model that uses significant inputs derived from, or corroborated by, observable market data and Zoetis’ credit rating (Level 2 inputs).

The principal amount of long-term debt outstanding, as of March 31, 2018, matures in the following years:

									After
(MILLIONS OF DOLLARS)	2019		2020		2021		2022		2022		Total
Maturities	$	—	$	500	$	—	$	—	$	4,500	$	5,000

Interest Expense

Interest expense, net of capitalized interest, was $47 million and $41 million for the three months endedMarch 31, 2018, and April 2, 2017, respectively. Capitalized interest expense was $2 million and $1 million for the three months endedMarch 31, 2018, and April 2, 2017, respectively.

B. Derivative Financial Instruments

Foreign Exchange Risk

A significant portion of our revenue, earnings and net investment in foreign affiliates is exposed to changes in foreign exchange rates. We seek to manage our foreign exchange risk, in part, through operational means, including managing same-currency revenue in relation to same-currency costs and same-currency assets in relation to same-currency liabilities. Depending on market conditions, foreign exchange risk is also managed through the use of derivative financial instruments. These financial instruments serve to protect net income against the impact of the translation into U.S. dollars of certain foreign exchange-denominated transactions. The aggregate notional amount of foreign exchange derivative financial instruments offsetting foreign currency exposures was $1.5 billion and $1.4 billion, as of March 31, 2018, and December 31, 2017, respectively. The derivative financial instruments primarily offset exposures in the Australian dollar, Brazilian real, British pound, Canadian dollar, Chinese renminbi, euro, and Norwegian krone. The vast majority of the foreign exchange derivative financial instruments mature within 60 days and all mature within 270 days.

All derivative contracts used to manage foreign currency risk are measured at fair value and are reported as assets or liabilities on the condensed consolidated balance sheet. The company has not designated the foreign currency forward-exchange contracts as hedging instruments. We recognize the gains and losses on forward-exchange contracts that are used to offset the same foreign currency assets or liabilities immediately into earnings along with the earnings impact of the items they generally offset. These contracts essentially take the opposite currency position of that reflected in the month-end balance sheet to counterbalance the effect of any currency movement.

Interest Rate Risk

The company may use interest rate swap contracts on certain investing and borrowing transactions to manage its net exposure to interest rates and to reduce its overall cost of borrowing. In anticipation of issuing fixed-rate debt, we may use forward-starting interest rate swaps that are designated as cash flow hedges to hedge against changes in interest rates that could impact expected future issuances of debt. To the extent these hedges of cash flows related to anticipated debt are effective, any unrealized gains or losses on the forward-starting interest rate swaps are reported in Accumulated other comprehensive loss and are recognized in income over the life of the future fixed-rate notes. When the company discontinues hedge accounting because it is no longer probable that an anticipated transaction will occur within the originally expected period of execution, or within an additional two-month period thereafter, changes to fair value accumulated in other comprehensive income are recognized immediately in earnings.

During 2017 and 2016, we entered into forward starting interest rate swaps with an aggregate notional value of $500 million. During the third quarter of 2017, we also entered in treasury lock trades with an aggregate notional value of $500 million. We designated these swaps and treasury locks (contracts) as cash flow hedges against interest rate exposure related principally to the anticipated future issuance of fixed-rate debt to be used primarily to refinance our 1.875% 2013 senior note due in 2018.

Upon issuance of our 2017 senior notes (see A. Debt: Senior Notes and Other Long-Term Debt), we terminated these contracts and paid $3 million in cash to the counterparties for settlement. The settlement amount, which represents the fair value of the contracts at the time of termination, was recorded in Accumulated other comprehensive loss, and will be amortized into income over the life of the 2017 senior notes. There was $0.1 million of ineffectiveness related to the forward swaps through the date of settlement which was immediately recognized as a loss within Interest expense—net of capitalized interest. In addition, in previous years we had entered into various forward-starting interest rate swap contracts that were designated as cash flow hedges and that were terminated upon issuance of fixed-rate notes. There were no outstanding interest rate swap contracts as of both March 31, 2018, and December 31, 2017.

Fair Value of Derivative Instruments

The classification and fair values of derivative instruments are as follows:

		Fair Value of Derivatives
		March 31,			December 31,
(MILLIONS OF DOLLARS)	Balance Sheet Location	2018			2017
Derivatives Not Designated as Hedging Instruments
Foreign currency forward-exchange contracts	Other current assets	$	11		$	10
Foreign currency forward-exchange contracts	Other current liabilities	(11		)	(9		)
Total derivatives not designated as hedging instruments		$	—		$	1

We use a market approach in valuing financial instruments on a recurring basis. Our derivative financial instruments are measured at fair value on a recurring basis using Level 2 inputs in the calculation of fair value.

The amounts of net losses on derivative instruments not designated as hedging instruments, recorded in Other (income)/deductions—net, are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Foreign currency forward-exchange contracts	$	10	$	29

These amounts were substantially offset in Other (income)/deductions—net by the effect of changing exchange rates on the underlying foreign currency exposures.

The amounts of unrecognized net gains/(losses) on derivative instruments designated as cash flow hedges, recorded, net of tax, in Other comprehensive income/(loss) were insignificant for both of the three months ended March 31, 2018 and April 2, 2017.

The net amount of deferred gains/(losses) related to derivative instruments designated as cash flow hedges that is expected to be reclassified fromAccumulated other comprehensive loss into earnings over the next 12 months is insignificant.

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Inventories

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories

The components of inventory are as follows:

	March 31,		December 31,
(MILLIONS OF DOLLARS)	2018		2017
Finished goods	$	770	$	788
Work-in-process	541		484
Raw materials and supplies	130		155
Inventories	$	1,441	$	1,427

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Goodwill and Other Intangible Assets

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

A. Goodwill

The components of, and changes in, the carrying amount of goodwill are as follows:

(MILLIONS OF DOLLARS)	U.S.		International		Total
Balance, December 31, 2017	$	671	$	839	$	1,510
Other(a)	—		22		22
Balance, March 31, 2018	$	671	$	861	$	1,532

^(a)  Includes adjustments for foreign currency translation.

The gross goodwill balance was $2,068 million and $2,046 million as of March 31, 2018, and December 31, 2017, respectively. Accumulated goodwill impairment losses were $536 million as of March 31, 2018, and December 31, 2017.

B. Other Intangible Assets

The components of identifiable intangible assets are as follows:

	As of March 31, 2018							As of December 31, 2017
						Identifiable							Identifiable
	Gross					Intangible Assets		Gross					Intangible Assets
	Carrying		Accumulated			Less Accumulated		Carrying		Accumulated			Less Accumulated
(MILLIONS OF DOLLARS)	Amount		Amortization			Amortization		Amount		Amortization			Amortization
Finite-lived intangible assets:
Developed technology rights	$	1,216	$	(454	)	$	762	$	1,185	$	(428	)	$	757
Brands	213		(146		)	67		213		(143		)	70
Trademarks and trade names	63		(48		)	15		62		(47		)	15
Other	239		(146		)	93		234		(143		)	91
Total finite-lived intangible assets	1,731		(794		)	937		1,694		(761		)	933
Indefinite-lived intangible assets:
Brands	37		—			37		37		—			37
Trademarks and trade names	67		—			67		67		—			67
In-process research and development	231		—			231		224		—			224
Product rights	8		—			8		8		—			8
Total indefinite-lived intangible assets	343		—			343		336		—			336
Identifiable intangible assets	$	2,074	$	(794	)	$	1,280	$	2,030	$	(761	)	$	1,269

C. Amortization

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 it benefits 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. Total amortization expense for finite-lived intangible assets was $25 million for each of the three months endedMarch 31, 2018, and April 2, 2017.

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Benefit Plans

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Benefit Plans

Benefit Plans

Our employees ceased to participate in the Pfizer, Inc. U.S. qualified defined benefit plans and the U.S. retiree medical plan effective December 31, 2012, and liabilities associated with our employees under these plans were retained by Pfizer. Pfizer continued to credit certain employees' service with Zoetis through December 31, 2017 (or termination of employment from Zoetis, if earlier) for certain early retirement benefits with respect to Pfizer's U.S. defined benefit pension and retiree medical plans. Pension and postretirement benefit expense associated with the extended service for certain employees in the U.S. plans totaled approximately $2 million in each three month period ended March 31, 2018, and April 2, 2017.

The following table provides the net periodic benefit cost associated with our international defined benefit pension plans:

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS)	2018			2017
Service cost	$	2		$	2
Interest cost	1			1
Expected return on plan assets	(1		)	(1		)
Curtailment and settlement loss	—			1
Net periodic benefit cost	$	2		$	3

Total company contributions to the international pension plans were $2 million and $3 million for the three months endedMarch 31, 2018, and April 2, 2017, respectively. We expect to contribute a total of approximately $6 million to these plans in 2018.

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Share-Based Payments

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Payments

Share-Based Payments

The company may grant a variety of share-based payments under the Zoetis 2013 Equity and Incentive Plan (the Equity Plan) to our employees and non-employee directors. The principal types of share-based awards available under the Equity Plan may include, but are not limited to, stock options, restricted stock and restricted stock units (RSUs), deferred stock units (DSUs), performance-vesting restricted stock units (PSUs) and other equity-based or cash-based awards.

The components of share-based compensation expense are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Stock options / stock appreciation rights	$	2	$	3
RSUs / DSUs	7		6
PSUs	2		2
Share-based compensation expense—total(a)	$	11	$	11

^(a)  For the three months endedMarch 31, 2018, and April 2, 2017, amounts capitalized to inventory were insignificant.

During the three months endedMarch 31, 2018, the company granted 536,070 stock options with a weighted-average exercise price of $73.26 per stock option and a weighted-average fair value of $20.29 per stock option. The fair-value based method for valuing each Zoetis stock option grant on the grant date uses the Black-Scholes-Merton option-pricing model, which incorporates a number of valuation assumptions. The weighted-average fair value was estimated based on the following assumptions: risk-free interest rate of 2.74%; expected dividend yield of 0.69%; expected stock price volatility of 23.62%; and expected term of 6.5 years. In general, stock options vest after three years of continuous service and the values determined through this fair-value based method generally are amortized on a straight-line basis over the vesting term into Cost of sales, Selling, general and administrative expenses, or Research and development expenses, as appropriate.

During the three months endedMarch 31, 2018, the company granted 428,976 RSUs with a weighted-average grant date fair value of $73.25 per RSU. RSUs are accounted for using a fair-value-based method that utilizes the closing price of Zoetis common stock on the date of grant. In general, RSUs vest after three years of continuous service from the grant date and the values generally are amortized on a straight-line basis over the vesting term into Cost of sales, Selling, general and administrative expenses, or Research and development expenses, as appropriate.

During the three months endedMarch 31, 2018, the company granted 109,574 PSUs with a weighted-average grant date fair value of $100.34 per PSU. PSUs are accounted for using a Monte Carlo simulation model. The units underlying the PSUs will be earned and vested over a three-year performance period, based upon the total shareholder return of the company in comparison to the total shareholder return of the companies comprising the S&P 500 index at the start of the performance period (Relative TSR). The weighted-average fair value was estimated based on volatility assumptions of Zoetis common stock and an average of the S&P 500 companies, which were 21.9% and 25.1%, respectively. Depending on the company’s Relative TSR performance at the end of the performance period, the recipient may earn between 0% and 200% of the target number of units. Vested units are settled in shares of the company’s common stock. PSU values are amortized on a straight-line basis over the vesting term into Cost of sales, Selling, general and administrative expenses, or Research and development expenses, as appropriate.

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Stockholders' Equity

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Stockholders' Equity

Stockholders' Equity

Zoetis is authorized to issue 6 billion shares of common stock and 1 billion shares of preferred stock.

In December 2016, the company's Board of Directors authorized a $1.5 billion share repurchase program. Purchases of Zoetis shares may be made at the discretion of management, depending on market conditions and business needs. As of March 31, 2018, there was approximately $810 million remaining under this authorization.

Changes in common shares and treasury stock were as follows:

(MILLIONS)	Common Shares Issued(a)	Treasury Stock(a)
Balance, December 31, 2016	501.89	9.04
Share-based compensation(b)	—	(0.78	)
Share repurchase program	—	2.31
Balance, April 2, 2017	501.89	10.56
Balance, December 31, 2017	501.89	15.76
Share-based compensation(b)	—	(0.99	)
Share repurchase program	—	2.40
Balance, March 31, 2018	501.89	17.17

^(a)   Shares may not add due to rounding.

^(b)   Includes the issuance of shares of common stock and the reissuance of shares from treasury stock in connection with the vesting of employee share-based awards. Treasury stock also includes the reacquisition of shares associated with the vesting of employee share-based awards to satisfy tax withholding requirements. For additional information regarding share-based compensation, see Note 12. Share-Based Payments.

Changes, net of tax, in accumulated other comprehensive loss, excluding noncontrolling interest, are as follows:

				Currency Translation
	Derivatives			Adjustment			Benefit Plans			Accumulated Other
	Net Unrealized			Net Unrealized			Actuarial			Comprehensive
(MILLIONS OF DOLLARS)	Gains/(Losses)			Gains/(Losses)			Gains/(Losses)			Loss
Balance, December 31, 2016	$	8		$	(583	)	$	(23	)	$	(598	)
Other comprehensive income, net of tax	—			44			2			46
Balance, April 2, 2017	$	8		$	(539	)	$	(21	)	$	(552	)
Balance, December 31, 2017	$	(3	)	$	(487	)	$	(15	)	$	(505	)
Other comprehensive income, net of tax	—			76			—			76
Balance, March 31, 2018	$	(3	)	$	(411	)	$	(15	)	$	(429	)

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Earnings per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings per Share

Earnings per Share

The following table presents the calculation of basic and diluted earnings per share:

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)	2018			2017
Numerator
Net income before allocation to noncontrolling interests	$	350		$	239
Less: Net (loss)/income attributable to noncontrolling interests	(2		)	1
Net income attributable to Zoetis Inc.	$	352		$	238
Denominator
Weighted-average common shares outstanding	485.9			492.4
Common stock equivalents: stock options, RSUs, PSUs and DSUs	3.9			2.9
Weighted-average common and potential dilutive shares outstanding	489.8			495.3
Earnings per share attributable to Zoetis Inc. stockholders—basic	$	0.72		$	0.48
Earnings per share attributable to Zoetis Inc. stockholders—diluted	$	0.72		$	0.48

The number of stock options outstanding under the company's Equity Plan that were excluded from the computation of diluted earnings per share, as the effect would have been antidilutive, were de minimis for the three months endedMarch 31, 2018, and approximately 1 million for the three months endedApril 2, 2017.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

We and certain of our subsidiaries are subject to numerous contingencies arising in the ordinary course of business. For a discussion of our tax contingencies, see Note 7. Income Taxes.

A. Legal Proceedings

Our non-tax contingencies include, among others, the following:

• Product liability and other product-related litigation, which can include injury, consumer, off-label promotion, antitrust and breach of contract claims.

• Commercial and other matters, which can include product-pricing claims and environmental claims and proceedings.

• Patent litigation, which typically involves challenges to the coverage and/or validity of our patents or those of third parties on various products or processes.

• Government investigations, which can involve regulation by national, state and local government agencies in the United States and in other countries.

Certain of these contingencies could result in losses, including damages, fines and/or civil penalties, and/or criminal charges, which could be substantial.

We believe that we have strong defenses in these types of matters, but litigation is inherently unpredictable and excessive verdicts do occur. We do not believe that any of these matters will have a material adverse effect on our financial position. However, we could incur judgments, enter into settlements or revise our expectations regarding the outcome of certain matters, and such developments could have a material adverse effect on our results of operations or cash flows in the period in which the amounts are paid.

We have accrued for losses that are both probable and reasonably estimable. Substantially all of these contingencies are subject to significant uncertainties and, therefore, determining the likelihood of a loss and/or the measurement of any loss can be complex. Consequently, we are unable to estimate the range of reasonably possible loss in excess of amounts accrued. Our assessments are based on estimates and assumptions that have been deemed reasonable by management, but the assessment process relies on estimates and assumptions that may prove to be incomplete or inaccurate, and unanticipated events and circumstances may occur that might cause us to change those estimates and assumptions.

Amounts recorded for legal and environmental contingencies can result from a complex series of judgments about future events and uncertainties and can rely on estimates and assumptions.

The principal matters to which we are a party are discussed below. In determining whether a pending matter is significant for financial reporting and disclosure purposes, we consider both quantitative and qualitative factors in order to assess materiality, such as, among other things, the amount of damages and the nature of any other relief sought in the proceeding, if such damages and other relief are specified; our view of the merits of the claims and of the strength of our defenses; whether the action purports to be a class action and our view of the likelihood that a class will be certified by the court; the jurisdiction in which the proceeding is pending; any experience that we or, to our knowledge, other companies have had in similar proceedings; whether disclosure of the action would be important to a reader of our financial statements, including whether disclosure might change a reader’s judgment about our financial statements in light of all of the information about the company that is available to the reader; the potential impact of the proceeding on our reputation; and the extent of public interest in the matter. In addition, with respect to patent matters, we consider, among other things, the financial significance of the product protected by the patent.

Ulianopolis, Brazil

In February 2012, the Municipality of Ulianopolis (State of Para, Brazil) filed a complaint against Fort Dodge Saúde Animal Ltda. (FDSAL), a Zoetis entity, and five other large companies alleging that waste sent to a local waste incineration facility for destruction, but that was not ultimately destroyed as the facility lost its operating permit, caused environmental impacts requiring cleanup.

The Municipality is seeking recovery of cleanup costs purportedly related to FDSAL's share of all waste accumulated at the incineration facility awaiting destruction, and compensatory damages to be allocated among the six defendants. We believe we have strong arguments against the claim, including defense strategies against any claim of joint and several liability.

At the request of the Municipal prosecutor, in April 2012, the lawsuit was suspended for one year. Since that time, the prosecutor has initiated investigations into the Municipality's actions in the matter as well as the efforts undertaken by the six defendants to remove and dispose of their individual waste from the incineration facility. On October 3, 2014, the Municipal prosecutor announced that the investigation remained ongoing and outlined the terms of a proposed Term of Reference (a document that establishes the minimum elements to be addressed in the preparation of an Environmental Impact Assessment), under which the companies would be liable to withdraw the waste and remediate the area. On March 5, 2015, we presented our response to the prosecutor’s proposed Term of Reference, arguing that the proposed terms were overly general in nature and expressing our interest in discussing alternatives to address the matter. The prosecutor agreed to consider our request to engage a technical consultant to conduct an environmental diagnostic of the contaminated area. On May 29, 2015, we, in conjunction with the other defendant companies, submitted a draft cooperation agreement to the prosecutor, which outlined the proposed terms and conditions for the engagement of a technical consultant to conduct the environmental diagnostic. On August 19, 2016, the parties and the prosecutor agreed to engage the services of a third-party consultant to conduct a limited environmental assessment of the site. The site assessment was conducted during June 2017, and a written report summarizing the results of the assessment was provided to the parties and the prosecutor in November 2017. The report noted that waste is still present on the site and that further environmental assessments are needed before a plan to manage that remaining waste can be prepared. We have not received any further communication from the prosecutor in response to the report.

Lascadoil Contamination in Animal Feed

An investigation by the U.S. Food and Drug Administration (FDA) and the Michigan Department of Agriculture is ongoing to determine how lascadoil, oil for industrial use, made its way into the feed supply of certain turkey and hog feed mills in Michigan. The contaminated feed is believed to have caused the deaths of approximately 50,000 turkeys and the contamination (but not death) of at least 20,000 hogs in August 2014. While it remains an open question as to how the lascadoil made its way into the animal feed, the allegations are that lascadoil intended to be sold for reuse as biofuel was inadvertently sold to producers of soy oil, who in turn, unknowingly sold the contaminated soy oil to fat recycling vendors, who then sold the contaminated soy oil to feed mills for use in animal feed. Indeed, related to the FDA investigation, Shur-Green Farms LLC, a producer of soy oil, recalled certain batches of soy oil allegedly contaminated with lascadoil on October 13, 2014.

During the course of its investigation, the FDA identified the process used to manufacture Zoetis’ Avatec® (lasalocid sodium) and Bovatec® (lasalocid sodium) products as one possible source of the lascadoil, since lascadoil contains small amounts of lasalocid, the active ingredient found in both products. Zoetis has historically sold any and all industrial lascadoil byproduct to an environmental company specializing in waste disposal. The environmental company is contractually obligated to incinerate the lascadoil or resell it for use in biofuel. Under the terms of the agreement, the environmental company is expressly prohibited from reselling the lascadoil to be used as a component in food. The FDA inspected the Zoetis site where Avatec and Bovatec are manufactured, and found no evidence that Zoetis was involved in the contamination of the animal feed.

On March 10, 2015, plaintiffs Restaurant Recycling, LLC (Restaurant Recycling) and Superior Feed Ingredients, LLC (Superior), both of whom are in the fat recycling business, filed a complaint in the Seventeenth Circuit Court for the State of Michigan against Shur-Green Farms alleging negligence and breach of warranty claims arising from their purchase of soy oil allegedly contaminated with lascadoil. Plaintiffs resold the allegedly contaminated soy oil to turkey feed mills for use in feed ingredient. Plaintiffs also named Zoetis as a defendant in the complaint alleging that Zoetis failed to properly manufacture its products and breached an implied warranty that the soy oil was fit for use at turkey and hog mills. Zoetis was served with the complaint on June 3, 2015, and we filed our answer, denying all allegations, on July 15, 2015. On August 10, 2015, several of the turkey feed mills filed a joint complaint against Restaurant Recycling, Superior, Shur-Green Farms and others, alleging claims for negligence, misrepresentation, and breach of warranty, arising out of their alleged purchase and use of the contaminated soy oil. The complaint raises only one count against Zoetis for negligence. We filed an answer to the complaint on November 2, 2015, denying the allegation. On May 16, 2016, two additional turkey producers filed a complaint in the Seventeenth Circuit Court for the State of Michigan against the company, Restaurant Recycling, Superior, Shur-Green Farms and others, alleging claims for negligence and breach of warranties. We filed an answer to the complaint on June 20, 2016, denying the allegations. The Court has consolidated all three cases in Michigan for purposes of discovery and disposition. On July 28, 2017, we filed a motion for summary disposition on the grounds that no genuine issues of material fact exist and that Zoetis is entitled to judgment as a matter of law. On October 19, 2017, the Court granted our motion and dismissed all claims against Zoetis. On October 31, 2017, the plaintiffs filed motions for reconsideration of the Court's decision granting summary disposition. The Court, denied all such motions on December 6, 2017, for the same reasons cited in the Court’s original decision. On December 27, 2017, the plaintiffs filed a request with the Michigan Court of Appeals seeking an interlocutory appeal of the lower Court’s decision, which we opposed on January 17, 2018. The matter is stayed pending a decision by the Court of Appeals.

Other Matters

The European Commission published a decision on alleged competition law infringements by several human health pharmaceutical companies on June 19, 2013. One of the involved legal entities is Alpharma LLC (previously having the name Zoetis Products LLC). Alpharma LLC's involvement is solely related to its human health activities prior to Pfizer's acquisition of King/Alpharma. Zoetis paid a fine in the amount of Euro 11 million (approximately $14 million) and was reimbursed in full by Pfizer in accordance with the Global Separation Agreement between Pfizer and Zoetis, which provides that Pfizer is obligated to indemnify Zoetis for any liabilities arising out of claims not related to its animal health assets. We filed an appeal of the decision on September 6, 2013, to the General Court of the European Union. On September 8, 2016, the General Court upheld the decision of the European Commission. On November 25, 2016, we filed an appeal to the Court of Justice of the European Union and are awaiting a ruling.

B. Guarantees and Indemnifications

In the ordinary course of business and in connection with the sale of assets and businesses, we indemnify our counterparties against certain liabilities that may arise in connection with the transaction or related to activities prior to the transaction. These indemnifications typically pertain to environmental, tax, employee and/or product-related matters and patent-infringement claims. If the indemnified party were to make a successful claim pursuant to the terms of the indemnification, we would be required to reimburse the loss. These indemnifications are generally subject to threshold amounts, specified claim periods and other restrictions and limitations. Historically, we have not paid significant amounts under these provisions and, as of March 31, 2018, recorded amounts for the estimated fair value of these indemnifications were not significant.

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Segment Information

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

Segment Information

Operating Segments

We manage our operations through two geographic operating segments: the United States and International. Each operating segment has responsibility for its commercial activities. Within each of these operating segments, we offer a diversified product portfolio, including vaccines, parasiticides, anti-infectives, medicated feed additives and other pharmaceuticals, for both livestock and companion animal customers. Our chief operating decision maker uses the revenue and earnings of the two operating segments, among other factors, for performance evaluation and resource allocation.

In the first quarter of 2018, the company realigned certain management responsibilities. These changes did not impact the determination of our operating segments, however they resulted in the reallocation of certain costs between segments. These changes primarily include the following: i) R&D costs related to our aquaculture business which were previously reported in Other business activities are now reported in the international commercial segment results, and ii) certain other miscellaneous costs which were previously reported in Corporate are now reported in the international commercial segment results.

Other Costs and Business Activities

Certain costs are not allocated to our operating segment results, such as costs associated with the following:

• Other business activities includes our Client Supply Services (CSS) contract manufacturing results, as well as expenses associated with our dedicated veterinary medicine research and development organization, research alliances, U.S. regulatory affairs, and other operations focused on the development of our products. Other R&D-related costs associated with our aquaculture business and non-U.S. market and regulatory activities are generally included in the international commercial segment.

• Corporate, which is responsible for platform functions such as business technology, facilities, legal, finance, human resources, business development, and communications, among others. These costs also include compensation costs, certain procurement costs, and other miscellaneous operating expenses not charged to our operating segments, as well as interest income and expense.

• Certain transactions and events such as (i) Purchase accounting adjustments, where we incur expenses associated with the amortization of fair value adjustments to inventory, intangible assets and property, plant and equipment; (ii) Acquisition-related activities, where we incur costs associated with acquiring and integrating newly acquired businesses, such as transaction costs and integration costs; and (iii) Certain significant items, which comprise substantive, unusual items that, either as a result of their nature or size, would not be expected to occur as part of our normal business on a regular basis, such as certain costs related to becoming an independent public company, restructuring charges and implementation costs associated with our cost-reduction/productivity initiatives that are not associated with an acquisition, certain asset impairment charges, certain legal and commercial settlements and the impact of divestiture-related gains and losses.

• Other unallocated includes (i) certain overhead expenses associated with our global manufacturing operations not charged to our operating segments; (ii) certain costs associated with business technology and finance that specifically support our global manufacturing operations; (iii) certain supply chain and global logistics costs; and (iv) certain procurement costs.

Segment Assets

We manage our assets on a total company basis, not by operating segment. Therefore, our chief operating decision maker does not regularly review any asset information by operating segment and, accordingly, we do not report asset information by operating segment.

Selected Statement of Income Information

	Earnings						Depreciation and Amortization(a)
	Three Months Ended						Three Months Ended
	March 31,			April 2,			March 31,		April 2,
(MILLIONS OF DOLLARS)	2018			2017			2018		2017
U.S.
Revenue	$	634		$	605
Cost of sales	140			137
Gross profit	494			468
Gross margin	77.9		%	77.4		%
Operating expenses	96			96
Other (income)/deductions	—			—
U.S. Earnings	398			372			$	8	$	7
International
Revenue(b)	726			615
Cost of sales	234			213
Gross profit	492			402
Gross margin	67.8		%	65.4		%
Operating expenses	133			114
Other (income)/deductions	1			(3		)
International Earnings	358			291			11		11
Total operating segments	756			663			19		18
Other business activities	(81		)	(74		)	5		6
Reconciling Items:
Corporate	(153		)	(143		)	13		12
Purchase accounting adjustments	(23		)	(22		)	23		22
Acquisition-related costs	(1		)	—			—		—
Certain significant items(c)	(3		)	(4		)	—		2
Other unallocated	(78		)	(83		)	—		2
Total Earnings(d)	$	417		$	337		$	60	$	62

^(a)  Certain production facilities are shared. Depreciation and amortization is allocated to the reportable operating segments based on estimates of where the benefits of the related assets are realized.

^(b)  Revenue denominated in euros was $184 million and $148 million for the three months endedMarch 31, 2018, and April 2, 2017, respectively.

^(c)  For the three months endedMarch 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 endedApril 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.

^(d)  Defined as income before provision for taxes on income.

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Accounting Standards (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements were prepared following the requirements of the Securities and Exchange Commission (SEC) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by accounting principles generally accepted in the United States of America (U.S. GAAP) can be condensed or omitted. Balance sheet amounts and operating results for subsidiaries operating outside the United States are as of and for the three-month periods ended February 28, 2018, and February 26, 2017.

Recently Adopted Accounting Standards and Recently Issued Accounting Standards

Recently Adopted Accounting Standards

In March 2018, the Financial Accounting Standards Board (FASB) issued an accounting standards update to align existing guidance on accounting for income taxes, pursuant to guidance provided by a Staff Accounting Bulletin published by the SEC on December 22, 2017. The update addresses the challenges in accounting for the effects of the Tax Cuts and Jobs Act (the Tax Act), enacted on December 22, 2017, in the period of enactment and required companies to report provisional amounts for those specific income tax effects of the Tax Act for which the accounting is incomplete but a reasonable estimate can be determined. Provisional amounts will be subject to adjustment during a measurement period of up to one year from the enactment date. For additional information, see Note 7. Tax Matters.

In March 2017, the FASB issued an accounting standards update to simplify and improve the reporting of net periodic pension benefit cost by requiring only present service cost to be presented in the same line item as other current employee compensation costs while remaining components of net periodic benefit cost would be presented within Other (income)/deductions—net outside of operations. We adopted this guidance as of January 1, 2018, the required effective date. The new standard did not have a significant impact on our consolidated financial statements.

In October 2016, the FASB issued an accounting standards update that requires the recognition of the income tax consequences of an intra-entity asset transfer, other than inventory, when the transfer occurs as opposed to when the asset is sold to an outside third party. We adopted this guidance as of January 1, 2018, the required effective date. The new standard did not have a significant impact on our consolidated financial statements.

In May 2014, the FASB issued an accounting standards update that outlines a new, single comprehensive model for companies to use in accounting for revenue arising from contracts with customers. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. We adopted this guidance as of January 1, 2018, the required effective date, using the modified retrospective adoption method. Prior period amounts have not been adjusted and continue to be reported in accordance with our historic accounting policies. Application of the standard using the modified retrospective method did not require an adjustment to opening retained earnings. For additional information, see Note 4. Revenue.

Recently Issued Accounting Standards

In February 2018, the FASB issued an accounting standards update which permits companies to reclassify from accumulated other comprehensive income to retained earnings stranded tax effects resulting from the new federal corporate income tax rate. In the period of adoption, a company may choose to either apply the amendments retrospectively to each period in which the effect of the change in federal income tax rate is recognized or to apply the amendments in that reporting period. The provisions of the update are effective beginning January 1, 2019 for interim and annual periods, with early adoption permitted for any interim period after issuance of the update. We are currently assessing the timing of our adoption and do not expect that the new standard will have a significant impact on our consolidated financial statements.

In August 2017, the FASB issued an accounting standards update which amends the hedge accounting recognition and presentation requirements and allows for more hedging strategies to be eligible for hedge accounting. Recognition of periodic hedge effectiveness will no longer be required for cash flow and net investment hedges and companies may elect to perform subsequent hedge effectiveness assessments qualitatively. The update also clarifies that the change in fair value of a derivative must be recorded in the same income statement line item as the earnings effect of the hedged item and introduces additional disclosure requirements including cumulative basis adjustments for fair value hedges and the effect of hedging on individual income statement line items. The provisions of the update are effective beginning January 1, 2019 for interim and annual periods with early adoption permitted for any interim period after issuance of the update. We are currently assessing the timing of our adoption as well as the potential impact that the standard will have on our consolidated financial statements.

In February 2016, the FASB issued an accounting standards update which requires lessees to recognize most leases on the balance sheet with a corresponding right of use asset. Leases will be classified as financing or operating which will drive the expense recognition pattern. For lessees, the income statement presentation and expense recognition pattern for financing and operating leases is similar to the current model for capital and operating leases, respectively. Companies may elect to exclude short-term leases. The update also requires additional disclosures that will better enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. We plan to adopt this guidance as of January 1, 2019, the required effective date, for annual and interim reporting periods. The new standard requires a modified retrospective adoption approach, at the beginning of the earliest comparative period presented in the financial statements. We have selected a lease accounting system and are currently evaluating our lease contracts, accounting policy elections, and the impact of adoption on our consolidated financial statements. While we do not expect adoption of the standard to have a significant impact on our consolidated statements of income, the impact on the assets and liabilities within our consolidated balance sheet may be material.

Revenue Recognition, Policy

Accounting Policy

Below are the significant accounting policies updated as of January 1, 2018 as a result of the adoption of the new revenue recognition guidance. For additional information, see Note 3. Accounting Standards.

We recognize revenue from product sales when control of the goods has transferred to the customer, which is typically once the goods have shipped and the customer has assumed title.Revenue reflects the total consideration to which we expect to be entitled (i.e. the transaction price), in exchange for products sold, after considering various types of variable consideration including rebates, sales allowances, product returns and discounts.

Variable consideration is estimated and recorded at the time that related revenue is recognized. Our estimates reflect the amount by which we expect variable consideration to impact revenue recognized and are generally based on contractual terms or historical experience, adjusted as necessary to reflect our expectations about the future. Our customer payment terms generally range from 60 to 90 days.

Estimates of variable consideration utilize a complex series of judgments and assumptions to determine the amount by which we expect revenue to be reduced, for example;

• for sales returns, we perform calculations in each market that incorporate the following, as appropriate: local returns policies and practices; historic returns as a percentage of revenue; estimated shelf life by product; an estimate of the amount of time between shipment and return or lag time; and any other factors that could impact the estimate of future returns, product recalls, discontinuation of products or a changing competitive environment; and

• for revenue incentives, we use our historical experience with similar incentives programs to estimate the impact of such programs on revenue for the current period.

Although the amounts recorded for these revenue deductions are dependent on estimates and assumptions, historically our adjustments to actual results have not been material. The sensitivity of our estimates can vary by program, type of customer and geographic location.

A deferral of revenue may be required in the event that we have not satisfied all customer obligations for which we have been compensated. The transaction price is allocated to the individual performance obligations on the basis of relative stand-alone selling price, which is typically based on actual sales prices. Revenue associated with unsatisfied performance obligations are contract liabilities, is recorded within Other current liabilities, and is recognized once control of the underlying products has transferred to the customer. Contract liabilities reflected within Other current liabilities as of the adoption date and subsequently recognized as revenue during the first quarter of 2018 were approximately $2 million. Contract liabilities as of March 31, 2018 were approximately $4 million.

We do not disclose the transaction price allocated to unsatisfied performance obligations related to contracts with an original expected duration of one year or less, or for contracts for which we recognize revenue in line with our right to invoice the customer. Estimated future revenue expected to be generated from long-term contracts with unsatisfied performance obligations as of March 31, 2018 are not material.

Taxes collected from customers relating to product sales and remitted to governmental authorities are excluded from Revenue. Shipping and handling costs incurred after control of the purchased product has transferred to the customer are accounted for as a fulfillment cost, within Selling, general and administrative expenses.

Tax Contingencies

Our tax liabilities for uncertain tax positions relate primarily to issues common among multinational corporations. Any settlements or statute of limitations expirations could result in a significant decrease in our uncertain tax positions. Substantially all of these unrecognized tax benefits, if recognized, would impact our effective income tax rate. We do not expect that within the next twelve months any of our uncertain tax positions could significantly decrease as a result of settlements with taxing authorities or the expiration of the statutes of limitations. Our assessments are based on estimates and assumptions that have been deemed reasonable by management, but our estimates of uncertain tax positions and potential tax benefits may not be representative of actual outcomes, and any variation from such estimates could materially affect our financial statements in the period of settlement or when the statutes of limitations expire, as we treat these events as discrete items in the period of resolution. Finalizing audits with the relevant taxing authorities can include formal administrative and legal proceedings, and, as a result, it is difficult to estimate the timing and range of possible changes related to our uncertain tax positions, and such changes could be significant.

Foreign Exchange and Interest Rate Risk

Foreign Exchange Risk

A significant portion of our revenue, earnings and net investment in foreign affiliates is exposed to changes in foreign exchange rates. We seek to manage our foreign exchange risk, in part, through operational means, including managing same-currency revenue in relation to same-currency costs and same-currency assets in relation to same-currency liabilities. Depending on market conditions, foreign exchange risk is also managed through the use of derivative financial instruments. These financial instruments serve to protect net income against the impact of the translation into U.S. dollars of certain foreign exchange-denominated transactions. The aggregate notional amount of foreign exchange derivative financial instruments offsetting foreign currency exposures was $1.5 billion and $1.4 billion, as of March 31, 2018, and December 31, 2017, respectively. The derivative financial instruments primarily offset exposures in the Australian dollar, Brazilian real, British pound, Canadian dollar, Chinese renminbi, euro, and Norwegian krone. The vast majority of the foreign exchange derivative financial instruments mature within 60 days and all mature within 270 days.

All derivative contracts used to manage foreign currency risk are measured at fair value and are reported as assets or liabilities on the condensed consolidated balance sheet. The company has not designated the foreign currency forward-exchange contracts as hedging instruments. We recognize the gains and losses on forward-exchange contracts that are used to offset the same foreign currency assets or liabilities immediately into earnings along with the earnings impact of the items they generally offset. These contracts essentially take the opposite currency position of that reflected in the month-end balance sheet to counterbalance the effect of any currency movement.

Interest Rate Risk

The company may use interest rate swap contracts on certain investing and borrowing transactions to manage its net exposure to interest rates and to reduce its overall cost of borrowing. In anticipation of issuing fixed-rate debt, we may use forward-starting interest rate swaps that are designated as cash flow hedges to hedge against changes in interest rates that could impact expected future issuances of debt. To the extent these hedges of cash flows related to anticipated debt are effective, any unrealized gains or losses on the forward-starting interest rate swaps are reported in Accumulated other comprehensive loss and are recognized in income over the life of the future fixed-rate notes. When the company discontinues hedge accounting because it is no longer probable that an anticipated transaction will occur within the originally expected period of execution, or within an additional two-month period thereafter, changes to fair value accumulated in other comprehensive income are recognized immediately in earnings.

During 2017 and 2016, we entered into forward starting interest rate swaps with an aggregate notional value of $500 million. During the third quarter of 2017, we also entered in treasury lock trades with an aggregate notional value of $500 million. We designated these swaps and treasury locks (contracts) as cash flow hedges against interest rate exposure related principally to the anticipated future issuance of fixed-rate debt to be used primarily to refinance our 1.875% 2013 senior note due in 2018.

Upon issuance of our 2017 senior notes (see A. Debt: Senior Notes and Other Long-Term Debt), we terminated these contracts and paid $3 million in cash to the counterparties for settlement. The settlement amount, which represents the fair value of the contracts at the time of termination, was recorded in Accumulated other comprehensive loss, and will be amortized into income over the life of the 2017 senior notes. There was $0.1 million of ineffectiveness related to the forward swaps through the date of settlement which was immediately recognized as a loss within Interest expense—net of capitalized interest. In addition, in previous years we had entered into various forward-starting interest rate swap contracts that were designated as cash flow hedges and that were terminated upon issuance of fixed-rate notes. There were no outstanding interest rate swap contracts as of both March 31, 2018, and December 31, 2017.

Legal Proceedings

Legal Proceedings

Our non-tax contingencies include, among others, the following:

• Product liability and other product-related litigation, which can include injury, consumer, off-label promotion, antitrust and breach of contract claims.

• Commercial and other matters, which can include product-pricing claims and environmental claims and proceedings.

• Patent litigation, which typically involves challenges to the coverage and/or validity of our patents or those of third parties on various products or processes.

• Government investigations, which can involve regulation by national, state and local government agencies in the United States and in other countries.

Certain of these contingencies could result in losses, including damages, fines and/or civil penalties, and/or criminal charges, which could be substantial.

We believe that we have strong defenses in these types of matters, but litigation is inherently unpredictable and excessive verdicts do occur. We do not believe that any of these matters will have a material adverse effect on our financial position. However, we could incur judgments, enter into settlements or revise our expectations regarding the outcome of certain matters, and such developments could have a material adverse effect on our results of operations or cash flows in the period in which the amounts are paid.

We have accrued for losses that are both probable and reasonably estimable. Substantially all of these contingencies are subject to significant uncertainties and, therefore, determining the likelihood of a loss and/or the measurement of any loss can be complex. Consequently, we are unable to estimate the range of reasonably possible loss in excess of amounts accrued. Our assessments are based on estimates and assumptions that have been deemed reasonable by management, but the assessment process relies on estimates and assumptions that may prove to be incomplete or inaccurate, and unanticipated events and circumstances may occur that might cause us to change those estimates and assumptions.

Amounts recorded for legal and environmental contingencies can result from a complex series of judgments about future events and uncertainties and can rely on estimates and assumptions.

The principal matters to which we are a party are discussed below. In determining whether a pending matter is significant for financial reporting and disclosure purposes, we consider both quantitative and qualitative factors in order to assess materiality, such as, among other things, the amount of damages and the nature of any other relief sought in the proceeding, if such damages and other relief are specified; our view of the merits of the claims and of the strength of our defenses; whether the action purports to be a class action and our view of the likelihood that a class will be certified by the court; the jurisdiction in which the proceeding is pending; any experience that we or, to our knowledge, other companies have had in similar proceedings; whether disclosure of the action would be important to a reader of our financial statements, including whether disclosure might change a reader’s judgment about our financial statements in light of all of the information about the company that is available to the reader; the potential impact of the proceeding on our reputation; and the extent of public interest in the matter. In addition, with respect to patent matters, we consider, among other things, the financial significance of the product protected by the patent.

Guarantees and Indemnifications

Guarantees and Indemnifications

In the ordinary course of business and in connection with the sale of assets and businesses, we indemnify our counterparties against certain liabilities that may arise in connection with the transaction or related to activities prior to the transaction. These indemnifications typically pertain to environmental, tax, employee and/or product-related matters and patent-infringement claims. If the indemnified party were to make a successful claim pursuant to the terms of the indemnification, we would be required to reimburse the loss. These indemnifications are generally subject to threshold amounts, specified claim periods and other restrictions and limitations. Historically, we have not paid significant amounts under these provisions and, as of March 31, 2018, recorded amounts for the estimated fair value of these indemnifications were not significant.

Segment Information

Operating Segments

We manage our operations through two geographic operating segments: the United States and International. Each operating segment has responsibility for its commercial activities. Within each of these operating segments, we offer a diversified product portfolio, including vaccines, parasiticides, anti-infectives, medicated feed additives and other pharmaceuticals, for both livestock and companion animal customers. Our chief operating decision maker uses the revenue and earnings of the two operating segments, among other factors, for performance evaluation and resource allocation.

In the first quarter of 2018, the company realigned certain management responsibilities. These changes did not impact the determination of our operating segments, however they resulted in the reallocation of certain costs between segments. These changes primarily include the following: i) R&D costs related to our aquaculture business which were previously reported in Other business activities are now reported in the international commercial segment results, and ii) certain other miscellaneous costs which were previously reported in Corporate are now reported in the international commercial segment results.

Other Costs and Business Activities

Certain costs are not allocated to our operating segment results, such as costs associated with the following:

• Other business activities includes our Client Supply Services (CSS) contract manufacturing results, as well as expenses associated with our dedicated veterinary medicine research and development organization, research alliances, U.S. regulatory affairs, and other operations focused on the development of our products. Other R&D-related costs associated with our aquaculture business and non-U.S. market and regulatory activities are generally included in the international commercial segment.

• Corporate, which is responsible for platform functions such as business technology, facilities, legal, finance, human resources, business development, and communications, among others. These costs also include compensation costs, certain procurement costs, and other miscellaneous operating expenses not charged to our operating segments, as well as interest income and expense.

• Certain transactions and events such as (i) Purchase accounting adjustments, where we incur expenses associated with the amortization of fair value adjustments to inventory, intangible assets and property, plant and equipment; (ii) Acquisition-related activities, where we incur costs associated with acquiring and integrating newly acquired businesses, such as transaction costs and integration costs; and (iii) Certain significant items, which comprise substantive, unusual items that, either as a result of their nature or size, would not be expected to occur as part of our normal business on a regular basis, such as certain costs related to becoming an independent public company, restructuring charges and implementation costs associated with our cost-reduction/productivity initiatives that are not associated with an acquisition, certain asset impairment charges, certain legal and commercial settlements and the impact of divestiture-related gains and losses.

• Other unallocated includes (i) certain overhead expenses associated with our global manufacturing operations not charged to our operating segments; (ii) certain costs associated with business technology and finance that specifically support our global manufacturing operations; (iii) certain supply chain and global logistics costs; and (iv) certain procurement costs.

Segment Assets

We manage our assets on a total company basis, not by operating segment. Therefore, our chief operating decision maker does not regularly review any asset information by operating segment and, accordingly, we do not report asset information by operating segment.

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Revenue Revenue Recognition and Deferred Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue Recognition and Deferred Revenue [Abstract]

Revenue from External Customers by Geographic Areas

Revenue by geographic area

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
United States	$	634	$	605
Australia	48		40
Brazil	70		66
Canada	40		34
China	64		52
France	33		29
Germany	38		28
Italy	27		22
Japan	41		34
Mexico	24		18
Spain	25		20
United Kingdom	52		43
Other developed markets	79		68
Other emerging markets	185		161
	1,360		1,220
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

Revenue from External Customers by Major Species

Revenue by major species

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
U.S.
Livestock	$	292	$	282
Companion Animal	342		323
	634		605
International
Livestock	478		421
Companion Animal	248		194
	726		615
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

Revenue from External Customers by Species

Revenue by species

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Livestock:
Cattle	$	416	$	386
Swine	175		160
Poultry	136		116
Fish	22		21
Other	21		20
	770		703
Companion Animal:
Dogs and Cats	549		482
Horses	41		35
	590		517
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

Schedule of Significant Product Revenues

Revenue by major product category

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Vaccines	$	356	$	319
Anti-infectives	297		268
Other pharmaceuticals	319		272
Parasiticides	191		184
Medicated feed additives	137		123
Other non-pharmaceuticals	60		54
	1,360		1,220
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

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Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives (Tables)

3 Months Ended

Mar. 31, 2018

Restructuring and Related Activities [Abstract]

Restructuring and Related Costs

The components of costs incurred in connection with restructuring initiatives, acquisitions and cost-reduction/productivity initiatives are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Restructuring charges/(reversals) and certain acquisition-related costs:
Integration costs(a)	$	1	$	—
Restructuring charges/(reversals)(b)(c):
Employee termination costs/(reversals)	1		(1		)
Total Restructuring charges/(reversals) and certain acquisition-related costs	$	2	$	(1	)

^(a)  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.

^(b)  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.

^(c)  The restructuring charges/(reversals) are associated with the following:

• For the three months endedMarch 31, 2018, Manufacturing/research/corporate ($1 million).

• For the three months endedApril 2, 2017, U.S. ($1 million) and International ($2 million reversal)

Charges related to the operational efficiency initiative and supply network strategy are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Restructuring charges/(reversals) and certain acquisition-related costs:
Operational efficiency initiative
Employee termination costs	$	—	$	(1	)
	—		(1		)
Supply network strategy:
Employee termination costs	1		—
	1		—
Total restructuring charges/(reversals) related to the operational efficiency initiative and supply network strategy	1		(1		)
Other supply network strategy charges
Cost of sales:
Accelerated depreciation	—		1
Consulting fees	1		2
Total other supply network strategy charges	1		3
Total charges associated with the operational efficiency initiative and supply network strategy	$	2	$	2

The components of, and changes in, our restructuring accruals are as follows:

(MILLIONS OF DOLLARS)	Accrual(a)
Balance, December 31, 2017(b)	$	41
Provision	1
Utilization and other(c)	(7		)
Balance, March 31, 2018(b)	$	35

^(a)   Changes in our restructuring accruals represent employee termination costs.

^(b)  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).

^(c)   Includes adjustments for foreign currency translation.

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Other (Income)/Deductions - Net (Tables)

3 Months Ended

Mar. 31, 2018

Other Income and Expenses [Abstract]

Components of Other (Income)/Deductions—Net

The components of Other (income)/deductions—net are as follows:

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS)	2018			2017
Royalty-related income	$	(7	)	$	(7	)
Foreign currency loss(a)	8			2
Other, net(b)	(6		)	(5		)
Other (income)/deductions—net	$	(5	)	$	(10	)

^(a)  Primarily driven by costs related to hedging and exposures to certain emerging market currencies.

^(b)  For the three months endedMarch 31, 2018, primarily includes interest income and other miscellaneous income. For the three months endedApril 2, 2017, primarily includes a settlement refund and reimbursement of legal fees related to costs incurred by Pharmaq prior to the acquisition in 2015, as well as interest income and other miscellaneous income.

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Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Financial Instruments [Abstract]

Schedule of Long-term Debt Instruments

The components of our long-term debt are as follows:

	March 31,			December 31,
(MILLIONS OF DOLLARS)	2018			2017
3.450% 2015 senior notes due 2020	$	500		$	500
3.250% 2013 senior notes due 2023	1,350			1,350
4.500% 2015 senior notes due 2025	750			750
3.000% 2017 senior notes due 2027	750			750
4.700% 2013 senior notes due 2043	1,150			1,150
3.950% 2017 senior notes due 2047	500			500
	5,000			5,000
Unamortized debt discount / debt issuance costs	(46		)	(47		)
Long-term debt, net of discount and issuance costs	$	4,954		$	4,953

Schedule of Maturities of Long-term Debt

The principal amount of long-term debt outstanding, as of March 31, 2018, matures in the following years:

									After
(MILLIONS OF DOLLARS)	2019		2020		2021		2022		2022		Total
Maturities	$	—	$	500	$	—	$	—	$	4,500	$	5,000

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The classification and fair values of derivative instruments are as follows:

		Fair Value of Derivatives
		March 31,			December 31,
(MILLIONS OF DOLLARS)	Balance Sheet Location	2018			2017
Derivatives Not Designated as Hedging Instruments
Foreign currency forward-exchange contracts	Other current assets	$	11		$	10
Foreign currency forward-exchange contracts	Other current liabilities	(11		)	(9		)
Total derivatives not designated as hedging instruments		$	—		$	1

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location

The amounts of net losses on derivative instruments not designated as hedging instruments, recorded in Other (income)/deductions—net, are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Foreign currency forward-exchange contracts	$	10	$	29

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)

amounts of unrecognized net gains/(losses) on derivative instruments designated as cash flow hedges, recorded, net of tax, in Other comprehensive income/(loss) were insignificant for both of the three months ended March 31, 2018 and April 2, 2017.

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Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Components of Inventory

The components of inventory are as follows:

	March 31,		December 31,
(MILLIONS OF DOLLARS)	2018		2017
Finished goods	$	770	$	788
Work-in-process	541		484
Raw materials and supplies	130		155
Inventories	$	1,441	$	1,427

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Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the Carrying Amount of Goodwill

The components of, and changes in, the carrying amount of goodwill are as follows:

(MILLIONS OF DOLLARS)	U.S.		International		Total
Balance, December 31, 2017	$	671	$	839	$	1,510
Other(a)	—		22		22
Balance, March 31, 2018	$	671	$	861	$	1,532

^(a)  Includes adjustments for foreign currency translation.

Components of Identifiable Intangible Assets

The components of identifiable intangible assets are as follows:

	As of March 31, 2018							As of December 31, 2017
						Identifiable							Identifiable
	Gross					Intangible Assets		Gross					Intangible Assets
	Carrying		Accumulated			Less Accumulated		Carrying		Accumulated			Less Accumulated
(MILLIONS OF DOLLARS)	Amount		Amortization			Amortization		Amount		Amortization			Amortization
Finite-lived intangible assets:
Developed technology rights	$	1,216	$	(454	)	$	762	$	1,185	$	(428	)	$	757
Brands	213		(146		)	67		213		(143		)	70
Trademarks and trade names	63		(48		)	15		62		(47		)	15
Other	239		(146		)	93		234		(143		)	91
Total finite-lived intangible assets	1,731		(794		)	937		1,694		(761		)	933
Indefinite-lived intangible assets:
Brands	37		—			37		37		—			37
Trademarks and trade names	67		—			67		67		—			67
In-process research and development	231		—			231		224		—			224
Product rights	8		—			8		8		—			8
Total indefinite-lived intangible assets	343		—			343		336		—			336
Identifiable intangible assets	$	2,074	$	(794	)	$	1,280	$	2,030	$	(761	)	$	1,269

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Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The following table provides the net periodic benefit cost associated with our international defined benefit pension plans:

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS)	2018			2017
Service cost	$	2		$	2
Interest cost	1			1
Expected return on plan assets	(1		)	(1		)
Curtailment and settlement loss	—			1
Net periodic benefit cost	$	2		$	3

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Share-Based Payments (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Components of Share-based Compensation Expense

The components of share-based compensation expense are as follows:

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Stock options / stock appreciation rights	$	2	$	3
RSUs / DSUs	7		6
PSUs	2		2
Share-based compensation expense—total(a)	$	11	$	11

^(a)  For the three months endedMarch 31, 2018, and April 2, 2017, amounts capitalized to inventory were insignificant.

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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Changes in Common Shares and Treasury Stock

Changes in common shares and treasury stock were as follows:

(MILLIONS)	Common Shares Issued(a)	Treasury Stock(a)
Balance, December 31, 2016	501.89	9.04
Share-based compensation(b)	—	(0.78	)
Share repurchase program	—	2.31
Balance, April 2, 2017	501.89	10.56
Balance, December 31, 2017	501.89	15.76
Share-based compensation(b)	—	(0.99	)
Share repurchase program	—	2.40
Balance, March 31, 2018	501.89	17.17

^(a)   Shares may not add due to rounding.

^(b)   Includes the issuance of shares of common stock and the reissuance of shares from treasury stock in connection with the vesting of employee share-based awards. Treasury stock also includes the reacquisition of shares associated with the vesting of employee share-based awards to satisfy tax withholding requirements. For additional information regarding share-based compensation, see Note 12. Share-Based Payments.

Changes, Net of Tax, in Accumulated Other Comprehensive Loss

Changes, net of tax, in accumulated other comprehensive loss, excluding noncontrolling interest, are as follows:

				Currency Translation
	Derivatives			Adjustment			Benefit Plans			Accumulated Other
	Net Unrealized			Net Unrealized			Actuarial			Comprehensive
(MILLIONS OF DOLLARS)	Gains/(Losses)			Gains/(Losses)			Gains/(Losses)			Loss
Balance, December 31, 2016	$	8		$	(583	)	$	(23	)	$	(598	)
Other comprehensive income, net of tax	—			44			2			46
Balance, April 2, 2017	$	8		$	(539	)	$	(21	)	$	(552	)
Balance, December 31, 2017	$	(3	)	$	(487	)	$	(15	)	$	(505	)
Other comprehensive income, net of tax	—			76			—			76
Balance, March 31, 2018	$	(3	)	$	(411	)	$	(15	)	$	(429	)

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Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Basic and Diluted Earnings Per Share

The following table presents the calculation of basic and diluted earnings per share:

	Three Months Ended
	March 31,			April 2,
(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)	2018			2017
Numerator
Net income before allocation to noncontrolling interests	$	350		$	239
Less: Net (loss)/income attributable to noncontrolling interests	(2		)	1
Net income attributable to Zoetis Inc.	$	352		$	238
Denominator
Weighted-average common shares outstanding	485.9			492.4
Common stock equivalents: stock options, RSUs, PSUs and DSUs	3.9			2.9
Weighted-average common and potential dilutive shares outstanding	489.8			495.3
Earnings per share attributable to Zoetis Inc. stockholders—basic	$	0.72		$	0.48
Earnings per share attributable to Zoetis Inc. stockholders—diluted	$	0.72		$	0.48

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Segment Information Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of Selected Income Statement Information by Segment

	Earnings						Depreciation and Amortization(a)
	Three Months Ended						Three Months Ended
	March 31,			April 2,			March 31,		April 2,
(MILLIONS OF DOLLARS)	2018			2017			2018		2017
U.S.
Revenue	$	634		$	605
Cost of sales	140			137
Gross profit	494			468
Gross margin	77.9		%	77.4		%
Operating expenses	96			96
Other (income)/deductions	—			—
U.S. Earnings	398			372			$	8	$	7
International
Revenue(b)	726			615
Cost of sales	234			213
Gross profit	492			402
Gross margin	67.8		%	65.4		%
Operating expenses	133			114
Other (income)/deductions	1			(3		)
International Earnings	358			291			11		11
Total operating segments	756			663			19		18
Other business activities	(81		)	(74		)	5		6
Reconciling Items:
Corporate	(153		)	(143		)	13		12
Purchase accounting adjustments	(23		)	(22		)	23		22
Acquisition-related costs	(1		)	—			—		—
Certain significant items(c)	(3		)	(4		)	—		2
Other unallocated	(78		)	(83		)	—		2
Total Earnings(d)	$	417		$	337		$	60	$	62

^(a)  Certain production facilities are shared. Depreciation and amortization is allocated to the reportable operating segments based on estimates of where the benefits of the related assets are realized.

^(b)  Revenue denominated in euros was $184 million and $148 million for the three months endedMarch 31, 2018, and April 2, 2017, respectively.

^(c)  For the three months endedMarch 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 endedApril 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.

^(d)  Defined as income before provision for taxes on income.

Schedule of Significant Product Revenues

Revenue by major product category

	Three Months Ended
	March 31,		April 2,
(MILLIONS OF DOLLARS)	2018		2017
Vaccines	$	356	$	319
Anti-infectives	297		268
Other pharmaceuticals	319		272
Parasiticides	191		184
Medicated feed additives	137		123
Other non-pharmaceuticals	60		54
	1,360		1,220
Contract Manufacturing	6		11
Total Revenue	$	1,366	$	1,231

XML

Organization (Details) - Mar. 31, 2018	species	country	region	category	product_category
Product Information [Line Items]
Number of regional segments | region			2
Number of countries in which entity markets products		45
Number of core animal species | species	8
Number of major product categories				5	300
Product
Product Information [Line Items]
Number of countries in which entity markets products		100

XML

Revenue - Narrative (Details) - Mar. 31, 2018 $ in Millions	USD ($)	category	product_category
Revenue Recognition and Deferred Revenue [Abstract]
Contract with Customer, Liability, Current	$ 2
Contract with Customer, Liability	$ 4
Number of major product categories		5	300

XML

Revenue - Revenue by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 02, 2017
Revenue from External Customer [Line Items]
Revenue	$ 1,366	$ 1,231
Contract Manufacturing
Revenue from External Customer [Line Items]
Revenue	6	11
U.S.
Revenue from External Customer [Line Items]
Revenue	634	605
Australia [Member]
Revenue from External Customer [Line Items]
Revenue	48	40
Brazil [Member]
Revenue from External Customer [Line Items]
Revenue	70	66
Canada [Member]
Revenue from External Customer [Line Items]
Revenue	40	34
China [Member]
Revenue from External Customer [Line Items]
Revenue	64	52
France [Member]
Revenue from External Customer [Line Items]
Revenue	33	29
Germany [Member]
Revenue from External Customer [Line Items]
Revenue	38	28
Italy [Member]
Revenue from External Customer [Line Items]
Revenue	27	22
Japan [Member]
Revenue from External Customer [Line Items]
Revenue	41	34
Mexico [Member]
Revenue from External Customer [Line Items]
Revenue	24	18
Spain [Member]
Revenue from External Customer [Line Items]
Revenue	25	20
United Kingdom [Member]
Revenue from External Customer [Line Items]
Revenue	52	43
Other Developed Markets [Member]
Revenue from External Customer [Line Items]
Revenue	79	68
Other Emerging Markets [Member]
Revenue from External Customer [Line Items]
Revenue	185	161
Total Geographical Area [Member]
Revenue from External Customer [Line Items]
Revenue	$ 1,360	$ 1,220

XML

Revenue - Revenue by Major Species (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 02, 2017
Revenue from External Customer [Line Items]
Revenue	$ 1,366	$ 1,231
U.S.
Revenue from External Customer [Line Items]
Revenue	634	605
International
Revenue from External Customer [Line Items]
Revenue		615
Companion Animal [Member]
Revenue from External Customer [Line Items]
Revenue	590	517
Companion Animal [Member] | U.S.
Revenue from External Customer [Line Items]
Revenue	342	323
Companion Animal [Member] | International
Revenue from External Customer [Line Items]
Revenue	248	194
Livestock [Member]
Revenue from External Customer [Line Items]
Revenue	770	703
Livestock [Member] | U.S.
Revenue from External Customer [Line Items]
Revenue	292	282
Livestock [Member] | International
Revenue from External Customer [Line Items]
Revenue	478	421
Contract Manufacturing
Revenue from External Customer [Line Items]
Revenue	$ 6	$ 11

XML

Revenue - Revenue by Species (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 02, 2017
Revenue from External Customer [Line Items]
Revenue	$ 1,366	$ 1,231
Cattle [Member]
Revenue from External Customer [Line Items]
Revenue	416	386
Swine [Member]
Revenue from External Customer [Line Items]
Revenue	175	160
Poultry [Member]
Revenue from External Customer [Line Items]
Revenue	136	116
Fish [Member]
Revenue from External Customer [Line Items]
Revenue	22	21
Sheep and Other [Member]
Revenue from External Customer [Line Items]
Revenue	21	20
Livestock [Member]
Revenue from External Customer [Line Items]
Revenue	770	703
Horses
Revenue from External Customer [Line Items]
Revenue	41	35
Dogs and Cats [Member]
Revenue from External Customer [Line Items]
Revenue	549	482
Companion Animal [Member]
Revenue from External Customer [Line Items]
Revenue	590	517
Contract manufacturing [Member]
Revenue from External Customer [Line Items]
Revenue	$ 6	$ 11

XML

Revenue - Revenue by Product (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 02, 2017
Revenue from External Customer [Line Items]
Revenue	$ 1,366	$ 1,231
Vaccines [Member]
Revenue from External Customer [Line Items]
Revenue	356	319
Anti-infective Products [Member]
Revenue from External Customer [Line Items]
Revenue	297	268
Other Pharmaceuticals [Member]
Revenue from External Customer [Line Items]
Revenue	319	272
Parasiticides [Member]
Revenue from External Customer [Line Items]
Revenue	191	184
Medicated feed additives
Revenue from External Customer [Line Items]
Revenue	137	123
Other Non Pharmaceuticals [Member]
Revenue from External Customer [Line Items]
Revenue	60	54
Total Products and Services [Member]
Revenue from External Customer [Line Items]
Revenue	1,360	1,220
Contract Manufacturing
Revenue from External Customer [Line Items]
Revenue	$ 6	$ 11

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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.

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Other (Income)/Deductions - Net (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Apr. 02, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty-related income		$ (7)	$ (7)
Foreign currency loss	[1]	8	2
Other, net	[2]	(6)	(5)
Other (income)/deductions—net		$ (5)	$ (10)

[1] Primarily driven by costs related to hedging and exposures to certain emerging market currencies.

[2] For the three months ended April 2, 2017, primarily includes a settlement refund and reimbursement of legal fees related to costs incurred by Pharmaq prior to the acquisition in 2015, as well as interest income and other miscellaneous income.

XML

Income Taxes - Taxes on Income (Details) - USD ($) $ in Millions		3 Months Ended
	Dec. 22, 2017	Mar. 31, 2018	Dec. 31, 2017	Apr. 02, 2017
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act of 2017 Percent	21.00%
Tax Cuts And Jobs Act of 2017 Incomplete Accounting Provisional Income Tax Expense Benefit			$ 212
Decrease to the one-time mandatory deemed repatriation tax obligation		$ 2
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent		0.60%
Effective tax rate for income from continuing operations		16.10%		29.10%
Share-based Payments [Member]
Income Tax Contingency [Line Items]
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 8		$ 5
Change in Non-U.S. Statutory Tax Rates [Member]
Income Tax Contingency [Line Items]
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		8		$ 3
Repatriation Tax due to Tax Act [Member]
Income Tax Contingency [Line Items]
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 2

XML

Income Taxes - Deferred Taxes (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net deferred income tax liability	$ 166	$ 300
Noncurrent deferred tax assets	80	80
Noncurrent deferred tax liabilities	$ 246	$ 380

XML

Income Taxes - Tax Contingencies (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Liabilities associated with uncertain tax positions	$ 191	$ 164
Unrecognized tax benefits, income tax penalties and interest accrued	12	11
Noncurrent Deferred Tax Assets
Income Tax Contingency [Line Items]
Liabilities associated with uncertain tax positions	4	3
Other Taxes Payable
Income Tax Contingency [Line Items]
Liabilities associated with uncertain tax positions	$ 187	$ 161

XML

Financial Instruments - Credit Facilities (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 71,000,000
Revolving credit facility, minimum interest coverage ratio	3.50
Line of credit facility	$ 0	$ 0
Operational Efficiency
Line of Credit Facility [Line Items]
Aggregate amount of all charges	$ 100,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility, term	5 years
Revolving credit facility, current borrowing capacity	$ 1,000,000,000.0
Line of credit facility, maximum borrowing capacity	$ 1,500,000,000.0
Revolving credit facility, covenant compliance ratio	3.50
Maximum total leverage ratio	4.00

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Financial Instruments - Commercial Paper Program (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Oct. 31, 2017	Feb. 28, 2013
Short-term Debt [Line Items]
Commercial paper	$ 0	$ 0
Commercial Paper
Short-term Debt [Line Items]
Capacity of commercial paper program				$ 1,000,000,000.0
Senior Notes Due 2018 [Member] | Senior Notes [Member]
Short-term Debt [Line Items]
Long-term debt current portion			$ 750,000,000
Make whole premium and accrued interest			$ 4,000,000

XML

Financial Instruments - Senior Notes Offering and Other Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Oct. 31, 2017	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
Debt, principal amount	$ 5,000	$ 5,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt, principal amount				$ 1,250	$ 1,250	$ 3,650
Debt, unamortized discount				$ 7	$ 2	$ 10
Debt, purchase price percent due to downgrade of investment grade						101.00%
Senior Notes [Member] | 3.000% 2017 senior notes due 2027
Debt Instrument [Line Items]
Debt, principal amount	750	750
Interest rate percentage				3.00%
Senior Notes [Member] | 3.950% 2017 senior notes due 2047
Debt Instrument [Line Items]
Debt, principal amount	$ 500	$ 500
Interest rate percentage				3.95%
Senior Notes [Member] | Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt current portion			$ 750
Interest rate percentage						1.875%

XML

Financial Instruments - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 02, 2017	Dec. 31, 2017	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
Total long-term debt	$ 5,000		$ 5,000
Unamortized debt discount / debt issuance costs	(46)		(47)
Long-term debt, net of discount and issuance costs	4,954		4,953
Capitalized interest	2	$ 1
Senior Notes [Member]
Debt Instrument [Line Items]
Total long-term debt				$ 1,250	$ 1,250	$ 3,650
Senior Notes [Member] | 3.450% 2015 senior notes due 2020
Debt Instrument [Line Items]
Interest rate percentage					3.45%
Total long-term debt	500		500
Senior Notes [Member] | 3.250% 2013 senior notes due 2023
Debt Instrument [Line Items]
Interest rate percentage						3.25%
Total long-term debt	1,350		1,350
Senior Notes [Member] | 4.500% 2015 senior notes due 2025
Debt Instrument [Line Items]
Interest rate percentage					4.50%
Total long-term debt	750		750
Senior Notes [Member] | 3.000% 2017 senior notes due 2027
Debt Instrument [Line Items]
Interest rate percentage				3.00%
Total long-term debt	750		750
Senior Notes [Member] | 4.700% 2013 senior notes due 2043
Debt Instrument [Line Items]
Interest rate percentage						4.70%
Total long-term debt	1,150		1,150
Senior Notes [Member] | 3.950% 2017 senior notes due 2047
Debt Instrument [Line Items]
Interest rate percentage				3.95%
Total long-term debt	$ 500		$ 500

XML

Financial Instruments - Fair Value of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Senior Notes [Member] | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Fair value, debt instrument	$ 5,083	$ 5,291

XML

Financial Instruments - Long-term Debt Maturity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 02, 2017	Dec. 31, 2017	Oct. 31, 2017	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
2018	$ 0
2019	500
2020	0
2021	0
After 2021	4,500
Total long-term debt	5,000		$ 5,000
Interest expense, net of capitalized interest	47	$ 41
Capitalized interest	$ 2	$ 1
Senior Notes [Member]
Debt Instrument [Line Items]
Total long-term debt					$ 1,250	$ 1,250	$ 3,650
Senior Notes [Member] | Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt current portion				$ 750

XML

Financial Instruments - Foreign Exchange Risk (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Oct. 01, 2017	Jan. 28, 2013
Senior Notes [Member] | Senior Notes Due 2018 [Member]
Derivative [Line Items]
Interest rate percentage				1.875%
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contract
Derivative [Line Items]
Derivative notional amount	$ 1,500	$ 1,400
Maturity period	60 days
Derivatives Not Designated as Hedging Instruments | Maximum | Foreign Exchange Contract
Derivative [Line Items]
Maturity period	270 days
Derivatives Designated as Hedging Instruments: | Interest rate swaps
Derivative [Line Items]
Derivative notional amount	$ 500
Derivatives Designated as Hedging Instruments: | Treasury Lock [Member]
Derivative [Line Items]
Derivative notional amount			$ 500

XML

Financial Instruments - Fair Value of Derivative Instruments (Details) - Foreign Exchange Forward - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Total derivatives	$ 0	$ 1
Other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	11	10
Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (11)	$ (9)

XML

Financial Instruments - Interest Rate Risk (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Apr. 02, 2017	Dec. 31, 2017
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Forward
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward-exchange contracts	$ 10.0	$ 29.0
Derivatives Designated as Hedging Instruments: | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loss on Contract Termination			$ 3.0
Loss on Cash Flow Hedge Ineffectiveness			$ 0.1

XML

Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Finished goods	$ 770	$ 788
Work-in-process	541	484
Raw materials and supplies	130	155
Inventories	$ 1,441	$ 1,427

XML

Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 1,510
Other	22	[1]
Ending Balance	1,532
United States (U.S.)
Goodwill [Roll Forward]
Beginning Balance	671
Other	0	[1]
Ending Balance	671
International
Goodwill [Roll Forward]
Beginning Balance	839
Other	22	[1]
Ending Balance	$ 861

[1] Includes adjustments for foreign currency translation.

XML

Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 02, 2017	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Gross goodwill	$ 2,068		$ 2,046
Accumulated goodwill impairment losses	536		$ 536
Amortization of intangible assets	$ 25	$ 25

XML

Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 02, 2017	Dec. 31, 2017
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	$ 1,731		$ 1,694
Finite-lived intangible assets, accumulated amortization	(794)		(761)
Finite-lived intangible assets, identifiable intangible assets, less accumulated amortization	937		933
Total indefinite-lived intangible assets	343		336
Intangible Assets, gross carrying amount	2,074		2,030
Identifiable intangible assets, less accumulated amortization	1,280		1,269
Amortization of intangible assets	25	$ 25
Brands
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets	37		37
Trademarks and Trade Names
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets	67		67
In Process Research and Development
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets	231		224
Product Rights
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets	8		8
Developed Technology Rights
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	1,216		1,185
Finite-lived intangible assets, accumulated amortization	(454)		(428)
Finite-lived intangible assets, identifiable intangible assets, less accumulated amortization	762		757
Brands
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	213		213
Finite-lived intangible assets, accumulated amortization	(146)		(143)
Finite-lived intangible assets, identifiable intangible assets, less accumulated amortization	67		70
Trademarks and Trade Names
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	63		62
Finite-lived intangible assets, accumulated amortization	(48)		(47)
Finite-lived intangible assets, identifiable intangible assets, less accumulated amortization	15		15
Other Intangible Assets
Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	239		234
Finite-lived intangible assets, accumulated amortization	(146)		(143)
Finite-lived intangible assets, identifiable intangible assets, less accumulated amortization	$ 93		$ 91

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Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 02, 2017
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 2	$ 2
Interest cost	1	1
Expected return on plan assets	(1)	(1)
Curtailment and settlement loss	0	1
Net periodic benefit cost	2	3
Domestic Plan
Defined Benefit Plan Disclosure [Line Items]
Pension and postretirement benefit expense	2	2
Foreign Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contributions to benefit plans	2	$ 3
Expected future contributions to benefit plans	$ 6

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Share-Based Payments - Components of Share-Based Compensation Expense (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Apr. 02, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense—direct	[1]	$ 11	$ 11
Stock options / stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense—direct		2	3
RSUs / DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense—direct		7	6
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense—direct		$ 2	$ 2

[1] For the three months ended March 31, 2018, and April 2, 2017, amounts capitalized to inventory were insignificant.

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Share-Based Payments - Narrative (Details)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options granted, shares | shares	536,070
Share-based compensation, weighted average exercise price (in dollars per share)	$ 73.26
Share-based compensation, Options, weighted average grant date fair value (in dollars per share)	$ 20.29
Share-based compensation, risk free interest rate	2.74%
Share-based compensation, expected dividend rate	0.69%
Share-based compensation, expected volatility rate	23.62%
Share-based compensation, expected term	6 years 6 months
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting period	3 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting period	3 years
Share-based compensation, granted, shares | shares	428,976
Share-based compensation, weighted average grant date fair value (in dollars per share)	$ 73.25
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, expected volatility rate	21.90%
Share-based compensation, award vesting period	3 years
Share-based compensation, granted, shares | shares	109,574
Share-based compensation, weighted average grant date fair value (in dollars per share)	$ 100.34
Performance Shares | PeerCompanies
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, expected volatility rate	25.10%
Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, target number of units percentage	0.00%
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, target number of units percentage	200.00%

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Stockholders' Equity - Changes in Common Shares and Treasury Stock (Details) - USD ($)		3 Months Ended
		Mar. 31, 2018		Apr. 02, 2017	Dec. 31, 2017
Class of Stock [Line Items]
Common stock, shares authorized		6,000,000,000			6,000,000,000
Preferred stock, shares authorized		1,000,000,000			1,000,000,000
Stock repurchase program, remaining authorized repurchase amount		$ 810,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued, shares	[1]	501,891,243
Treasury stock, shares	[1]	15,760,782
Stock issued, employee stock purchase plans, shares	[1],[2]	0		0
Stock issued, employee benefit plan, shares	[1]	0		0
Common stock issued, shares	[1]	501,891,243
Treasury stock, shares		17,166,998	[1]	10,562,764
Stock Compensation Plan
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock acquired, shares	[1],[2]	(990,000)		(780,000)
Share Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock acquired, shares	[1]	(2,400,000)		(2,310,000)
December 2016 Share Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 1,500,000,000.0

[1] Shares may not add due to rounding.

[2] Includes the issuance of shares of common stock and the reissuance of shares from treasury stock in connection with the vesting of employee share-based awards. Treasury stock also includes the reacquisition of shares associated with the vesting of employee share-based awards to satisfy tax withholding requirements. For additional information regarding share-based compensation, see Note 12. Share-Based Payments.

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Stockholders' Equity - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 02, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 1,786	$ 1,499
Other comprehensive income, net of tax	77	46
Ending balance	1,975	1,635
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(505)	(598)
Other comprehensive income, net of tax	76	46
Ending balance	(429)	(552)
Derivatives Net Unrealized Gains/ (Losses)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(3)	8
Other comprehensive income, net of tax	0	0
Ending balance	(3)	8
Currency Translation Adjustment Net Unrealized Gain/(Losses)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(487)	(583)
Other comprehensive income, net of tax	76	44
Ending balance	(411)	(539)
Benefit Plans Actuarial Gains/(Losses)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(15)	(23)
Other comprehensive income, net of tax	0	2
Ending balance	$ (15)	$ (21)

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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 02, 2017
Numerator
Net income before allocation to noncontrolling interests	$ 350	$ 239
Less: Net (loss)/income attributable to noncontrolling interests	(2)	1
Net income attributable to Zoetis Inc.	$ 352	$ 238
Denominator
Weighted-average common shares outstanding	485.9	492.4
Common stock equivalents: stock options, RSUs, PSUs and DSUs	3.9	2.9
Weighted-average common and potential dilutive shares outstanding	489.8	495.3
Earnings per share attributable to Zoetis stockholders—basic (in dollars per share)	$ 0.72	$ 0.48
Earnings per share attributable to Zoetis stockholders—diluted (in dollars per share)	$ 0.72	$ 0.48
Stock options
Denominator
Antidilutive securities excluded from computation of earnings per share, amount	1.0

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Commitments and Contingencies (Details)			1 Months Ended		3 Months Ended
	May 16, 2016 producer	Jun. 03, 2015 count	Aug. 31, 2014 animal	Apr. 30, 2012	Mar. 31, 2018 customer	Feb. 29, 2012 defendant
Ulianopolis, Brazil
Loss Contingencies [Line Items]
Number of claims seeking damages | defendant						6
Number of additional defendants | defendant						5
Duration of suspension of lawsuit				1 year
Lasadoil
Loss Contingencies [Line Items]
Number of deaths from contamination of animal feed | animal			50,000
Number of contaminated animal from contamination of animal feed | animal			20,000
Number of complaints	2	1			3

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Segment Information Segment Information (Details)	3 Months Ended
	Mar. 31, 2018 segment
Segment Reporting [Abstract]
Number of operating segments	2

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Segment Information Selected Statement of Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Apr. 02, 2017
Segment Reporting Information [Line Items]
Revenue		$ 1,366	$ 1,231
Cost of Sales		447	443
Other (income)/deductions—net		(5)	(10)
Income before provision for taxes on income	[1]	417	337
Depreciation and amortization	[1],[2]	60	62
U.S.
Segment Reporting Information [Line Items]
Revenue		634	605
International
Segment Reporting Information [Line Items]
Revenue			615
Other business activities
Segment Reporting Information [Line Items]
Income before provision for taxes on income		(81)	(74)
Depreciation and amortization	[2]	5	6
Operating Segments
Segment Reporting Information [Line Items]
Income before provision for taxes on income		756	663
Depreciation and amortization	[2]	19	18
Operating Segments | U.S.
Segment Reporting Information [Line Items]
Revenue		634	605
Cost of Sales		140	137
Gross Profit		$ 494	$ 468
Gross margin, percentage		77.90%	77.40%
Operating Expenses		$ 96	$ 96
Other (income)/deductions—net		0	0
Income before provision for taxes on income		398	372
Depreciation and amortization	[2]	8	7
Operating Segments | International
Segment Reporting Information [Line Items]
Revenue	[3]	726	615
Cost of Sales		234	213
Gross Profit		$ 492	$ 402
Gross margin, percentage		67.80%	65.40%
Operating Expenses		$ 133	$ 114
Other (income)/deductions—net		1	(3)
Income before provision for taxes on income		358	291
Depreciation and amortization	[2]	11	11
Corporate
Segment Reporting Information [Line Items]
Income before provision for taxes on income		(153)	(143)
Depreciation and amortization	[2]	13	12
Reconciling Items
Segment Reporting Information [Line Items]
Purchase accounting adjustments, Earnings		(23)	(22)
Purchase accounting adjustments, Depreciation and Amortization	[2]	23	22
Acquisition-related costs		(1)	0
Certain significant items, Earnings	[4]	(3)	(4)
Certain significant items, Depreciation and Amortization	[2],[4]	0	2
Other unallocated, Earnings		(78)	(83)
Other Unallocated, Depreciation and Amortization	[2]	$ 0	$ 2

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

[2] Certain production facilities are shared. Depreciation and amortization is allocated to the reportable operating segments based on estimates of where the benefits of the related assets are realized.

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

[4] 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.

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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.