10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended March 31, 2017

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 No. 1-6571

Merck & Co., Inc.

2000 Galloping Hill Road

Kenilworth, N.J. 07033

(908) 740-4000

Incorporated in New Jersey	I.R.S. Employer
	Identification No. 22-1918501

The number of shares of common stock outstanding as of the close of business on April 30, 2017: 2,735,164,510

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 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.  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).  Yes  ☒   No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the 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	☒	Accelerated filer	☐
Non-accelerated filer	☐ (Do not check if a smaller reporting company)	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 ☐  No ☒

Part I - Financial Information

Item 1. Financial Statements

MERCK & CO., INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENT OF INCOME

(Unaudited, $ in millions except per share amounts)

	Three Months Ended   March 31,
	2017		2016
Sales	$	9,434	$	9,312
Costs, Expenses and Other
Materials and production	3,015		3,572
Marketing and administrative	2,411		2,318
Research and development	1,796		1,659
Restructuring costs	151		91
Other (income) expense, net	58		48
	7,431		7,688
Income Before Taxes	2,003		1,624
Taxes on Income	447		494
Net Income	1,556		1,130
Less: Net Income Attributable to Noncontrolling Interests	5		5
Net Income Attributable to Merck & Co., Inc.	$	1,551	$	1,125
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders	$	0.56	$	0.41
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders	$	0.56	$	0.40
Dividends Declared per Common Share	$	0.47	$	0.46

MERCK & CO., INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME

(Unaudited, $ in millions)

	Three Months Ended   March 31,
	2017			2016
Net Income Attributable to Merck & Co., Inc.	$	1,551		$	1,125
Other Comprehensive Income (Loss) Net of Taxes:
Net unrealized loss on derivatives, net of reclassifications	(232		)	(202		)
Net unrealized gain on investments, net of reclassifications	43			63
Benefit plan net gain (loss) and prior service credit (cost), net of amortization	26			(28		)
Cumulative translation adjustment	309			121
	146			(46		)
Comprehensive Income Attributable to Merck & Co., Inc.	$	1,697		$	1,079

The accompanying notes are an integral part of these condensed consolidated financial statements.

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MERCK & CO., INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEET

(Unaudited, $ in millions except per share amounts)

	March 31, 2017			December 31, 2016
Assets
Current Assets
Cash and cash equivalents	$	11,708		$	6,515
Short-term investments	3,541			7,826
Accounts receivable (net of allowance for doubtful accounts of $195 in 2017 and 2016)	7,066			7,018
Inventories (excludes inventories of $1,090 in 2017 and $1,117 in 2016 classified in Other assets - see Note 5)	5,146			4,866
Other current assets	4,069			4,389
Total current assets	31,530			30,614
Investments	11,896			11,416
Property, Plant and Equipment, at cost, net of accumulated depreciation of $16,171 in 2017 and $15,749 in 2016	12,042			12,026
Goodwill	18,358			18,162
Other Intangibles, Net	16,863			17,305
Other Assets	5,872			5,854
	$	96,561		$	95,377
Liabilities and Equity
Current Liabilities
Loans payable and current portion of long-term debt	$	5,037		$	568
Trade accounts payable	2,484			2,807
Accrued and other current liabilities	8,658			10,274
Income taxes payable	2,330			2,239
Dividends payable	1,314			1,316
Total current liabilities	19,823			17,204
Long-Term Debt	23,437			24,274
Deferred Income Taxes	4,889			5,077
Other Noncurrent Liabilities	8,324			8,514
Merck & Co., Inc. Stockholders’ Equity
Common stock, $0.50 par value Authorized - 6,500,000,000 shares Issued - 3,577,103,522 shares in 2017 and 2016	1,788			1,788
Other paid-in capital	39,899			39,939
Retained earnings	44,387			44,133
Accumulated other comprehensive loss	(5,080		)	(5,226		)
	80,994			80,634
Less treasury stock, at cost: 836,667,641 shares in 2017 and 828,372,200 shares in 2016	41,157			40,546
Total Merck & Co., Inc. stockholders’ equity	39,837			40,088
Noncontrolling Interests	251			220
Total equity	40,088			40,308
	$	96,561		$	95,377

The accompanying notes are an integral part of this condensed consolidated financial statement.

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MERCK & CO., INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS

(Unaudited, $ in millions)

	Three Months Ended   March 31,
	2017			2016
Cash Flows from Operating Activities
Net income	$	1,556		$	1,130
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,193			1,561
Intangible asset impairment charges	80			277
Deferred income taxes	(54		)	(70		)
Share-based compensation	74			68
Other	(28		)	82
Net changes in assets and liabilities	(2,535		)	(875		)
Net Cash Provided by Operating Activities	286			2,173
Cash Flows from Investing Activities
Capital expenditures	(339		)	(279		)
Purchases of securities and other investments	(2,929		)	(2,367		)
Proceeds from sales of securities and other investments	6,819			4,620
Acquisitions of businesses, net of cash acquired	(306		)	(147		)
Other	(52		)	(86		)
Net Cash Provided by Investing Activities	3,193			1,741
Cash Flows from Financing Activities
Net change in short-term borrowings	3,784			—
Payments on debt	(300		)	(851		)
Purchases of treasury stock	(1,019		)	(913		)
Dividends paid to stockholders	(1,294		)	(1,279		)
Proceeds from exercise of stock options	313			202
Other	(23		)	(25		)
Net Cash Provided by (Used in) Financing Activities	1,461			(2,866		)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	253			144
Net Increase in Cash and Cash Equivalents	5,193			1,192
Cash and Cash Equivalents at Beginning of Year	6,515			8,524
Cash and Cash Equivalents at End of Period	$	11,708		$	9,716

The accompanying notes are an integral part of this condensed consolidated financial statement.

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Notes to Condensed Consolidated Financial Statements (unaudited)

1. Basis of Presentation

The accompanying unaudited condensed consolidated financial statements of Merck & Co., Inc. (Merck or the Company) have been prepared pursuant to the rules and regulations for reporting on Form 10-Q. Accordingly, certain information and disclosures required by accounting principles generally accepted in the United States for complete consolidated financial statements are not included herein. These interim statements should be read in conjunction with the audited financial statements and notes thereto included in Merck’s Form 10-K filed on February 28, 2017.

The results of operations of any interim period are not necessarily indicative of the results of operations for the full year. In the Company’s opinion, all adjustments necessary for a fair statement of these interim statements have been included and are of a normal and recurring nature. Certain reclassifications have been made to prior year amounts to conform to the current presentation.

On December 31, 2016, Merck and Sanofi Pasteur S.A. terminated their equally-owned joint venture, Sanofi Pasteur MSD (SPMSD), which developed and marketed vaccines in Europe. Beginning in 2017, Merck is recording vaccine sales in the European markets that were previously part of the joint venture.

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (FASB) issued amended accounting guidance on revenue recognition that will be applied to all contracts with customers. The objective of the new guidance is to improve comparability of revenue recognition practices across entities and to provide more useful information to users of financial statements through improved disclosure requirements. In August 2015, the FASB approved a one-year deferral of the effective date making this guidance effective for interim and annual periods beginning in 2018. The new standard permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of adopting the guidance being recognized at the date of initial application (modified retrospective method). The Company will adopt the new standard on January 1, 2018 and currently plans to use the modified retrospective method. The majority of the Company’s business is ship and bill and, on that primary revenue stream, Merck does not expect significant differences. However, the Company’s analysis is preliminary and subject to change. Merck has not completed its assessment of multiple element arrangements and certain discount and trade promotion programs.

In January 2016, the FASB issued revised guidance for the accounting and reporting of financial instruments. The new guidance requires that equity investments with readily determinable fair values currently classified as available-for-sale be measured at fair value with changes in fair value recognized in net income. The new guidance also simplifies the impairment testing of equity investments without readily determinable fair values and changes certain disclosure requirements. This guidance is effective for interim and annual periods beginning in 2018. Early adoption is not permitted. The Company is currently assessing the impact of adoption on its consolidated financial statements.

In August 2016, the FASB issued guidance on the classification of certain cash receipts and payments in the statement of cash flows intended to reduce diversity in practice. The guidance is effective for interim and annual periods beginning in 2018. Early adoption is permitted. The guidance is to be applied retrospectively to all periods presented but may be applied prospectively if retrospective application would be impracticable. The Company is currently evaluating the effect of the standard on its Consolidated Statement of Cash Flows.

In October 2016, the FASB issued guidance on the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. Under existing guidance, the recognition of current and deferred income taxes for an intra-entity asset transfer is prohibited until the asset has been sold to a third party. The new guidance will require the recognition of the income tax consequences of an intra-entity transfer of an asset (with the exception of inventory) when the intra-entity transfer occurs. The guidance is effective for interim and annual periods beginning in 2018. Early adoption is permitted. The new guidance is to be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings in the beginning of the period of adoption. The Company does not anticipate the adoption of the new guidance will have a material effect on its consolidated financial statements.

In November 2016, the FASB issued guidance requiring that amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The guidance is effective for interim and annual periods beginning in 2018 and should be applied using a retrospective transition method to each period presented. Early adoption is permitted. The Company is currently evaluating the effect of the standard on its Consolidated Statement of Cash Flows.

In March 2017, the FASB amended the guidance related to net periodic benefit cost for defined benefit plans that requires entities to (1) disaggregate the current service cost component from the other components of net benefit cost and present it with other employee compensation costs in the income statement within operations if such a subtotal is presented; (2) present the other components of net benefit cost separately in the income statement and outside of income from operations; and (3) only capitalize the service cost component when applicable. The new guidance is effective for interim and annual periods in 2018.

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Notes to Condensed Consolidated Financial Statements (unaudited)

Entities must use a retrospective transition method to adopt the requirement for separate presentation in the income statement of service costs and other components and a prospective transition method to adopt the requirement to limit the capitalization of benefit costs to the service cost component. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In February 2016, the FASB issued new accounting guidance for the accounting and reporting of leases. The new guidance requires that lessees recognize a right-of-use asset and a lease liability recorded on the balance sheet for each of its leases (other than leases that meet the definition of a short-term lease).  Leases will be classified as either operating or finance. Operating leases will result in straight-line expense in the income statement (similar to current operating leases) while finance leases will result in more expense being recognized in the earlier years of the lease term (similar to current capital leases). The new guidance will be effective for interim and annual periods beginning in 2019. Early adoption is permitted. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In June 2016, the FASB issued amended guidance on the accounting for credit losses on financial instruments within its scope. The guidance introduces an expected loss model for estimating credit losses, replacing the incurred loss model. The new guidance also changes the impairment model for available-for-sale debt securities, requiring the use of an allowance to record estimated credit losses (and subsequent recoveries). The new guidance is effective for interim and annual periods beginning in 2020, with earlier application permitted in 2019. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In January 2017, the FASB issued guidance that provides for the elimination of Step 2 from the goodwill impairment test. If impairment charges are recognized, the amount recorded will be the amount by which the carrying amount exceeds the reporting unit’s fair value with certain limitations. The new guidance is effective for interim and annual periods in 2020. Early adoption is permitted. The Company does not anticipate the adoption of the new guidance will have a material effect on its consolidated financial statements.

2. Acquisitions, Divestitures, Research Collaborations and License Agreements

The Company continues to pursue the acquisition of businesses and establishment of external alliances such as research collaborations and licensing agreements to complement its internal research capabilities. These arrangements often include upfront payments, as well as expense reimbursements or payments to the third party, and milestone, royalty or profit share payments, contingent upon the occurrence of certain future events linked to the success of the asset in development. The Company also reviews its marketed products and pipeline to examine candidates which may provide more value through out-licensing and, as part of its portfolio assessment process, may also divest certain assets. Pro forma financial information for acquired businesses is not presented if the historical financial results of the acquired entity are not significant when compared with the Company’s financial results.

In March 2017, Merck acquired a controlling interest in Vallée S.A. (Vallée), a leading privately held producer of animal health products in Brazil. Vallée has an extensive portfolio of products spanning parasiticides, anti-infectives and vaccines that include products for livestock, horses, and companion animals. Under the terms of the agreement, Merck acquired 93.5% of the shares of Vallée for $358 million. Of the total purchase price, $176 million was placed into escrow pending resolution of certain contingent items. The transaction was accounted for as an acquisition of a business. Merck recognized intangible assets of $297 million related to currently marketed products, net deferred tax liabilities of $95 million, other net assets of $1 million and noncontrolling interest of $25 million. In addition, the Company recorded liabilities of $37 million for contingencies identified at the acquisition date and corresponding indemnification assets of $37 million, representing the amounts to be reimbursed to Merck if and when the contingent liabilities are paid. The excess of the consideration transferred over the fair value of net assets acquired of $180 million was recorded as goodwill. The goodwill was allocated to the Animal Health segment and is not deductible for tax purposes. The estimated fair values of identifiable intangible assets related to currently marketed products were determined using an income approach through which fair value is estimated based on market participant expectations of each asset’s discounted projected net cash flows. The probability-adjusted future net cash flows of each product were then discounted to present value utilizing a discount rate of 15.5%. Actual cash flows are likely to be different than those assumed. The intangible assets related to currently marketed products are being amortized over their estimated useful lives of 15 years.

In January 2016, Merck acquired IOmet Pharma Ltd (IOmet), a privately held UK-based drug discovery company focused on the development of innovative medicines for the treatment of cancer, with a particular emphasis on the fields of cancer immunotherapy and cancer metabolism. The acquisition provides Merck with IOmet’s preclinical pipeline of IDO (indoleamine-2,3-dioxygenase 1), TDO (tryptophan-2,3-dioxygenase), and dual-acting IDO/TDO inhibitors. The transaction was accounted for as an acquisition of a business. Total purchase consideration in the transaction included a cash payment of $150 million and future additional milestone payments of up to $250 million that are contingent upon certain clinical and regulatory milestones being achieved. The Company determined the fair value of the contingent consideration was $94 million at the acquisition date utilizing a probability-weighted estimated cash flow stream adjusted for the expected timing of each payment utilizing a

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Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

discount rate of 10.5%. Merck recognized intangible assets for in-process research and development (IPR&D) of $155 million and net deferred tax assets of $32 million. The excess of the consideration transferred over the fair value of net assets acquired of $57 million was recorded as goodwill that was allocated to the Pharmaceutical segment and is not deductible for tax purposes. The fair values of the identifiable intangible assets related to IPR&D were determined using an income approach. The assets’ probability-adjusted future net cash flows were then discounted to present value also using a discount rate of 10.5%. Actual cash flows are likely to be different than those assumed.

Additionally, in January 2016, Merck sold the U.S. marketing rights to Cortrophin and Corticotropin Zinc Hydroxide to ANI Pharmaceuticals, Inc. (ANI). Under the terms of the agreement, ANI made a payment of $75 million, which was recorded in Sales in the first quarter of 2016, and may make additional payments to the Company based on future sales. Merck does not have any ongoing supply or other performance obligations after the closing date.

3. Restructuring

The Company incurs substantial costs for restructuring program activities related to Merck’s productivity and cost reduction initiatives, as well as in connection with the integration of certain acquired businesses. In 2010 and 2013, the Company commenced actions under global restructuring programs designed to streamline its cost structure. The actions under these programs include the elimination of positions in sales, administrative and headquarters organizations, as well as the sale or closure of certain manufacturing and research and development sites and the consolidation of office facilities. The Company also continues to reduce its global real estate footprint and improve the efficiency of its manufacturing and supply network. The non-facility related restructuring actions under these programs are substantially complete; the remaining activities primarily relate to ongoing facility rationalizations.

The Company recorded total pretax costs of $215 million and $196 million in the first quarter of 2017 and 2016, respectively, related to restructuring program activities. Since inception of the programs through March 31, 2017, Merck has recorded total pretax accumulated costs of approximately $12.8 billion and eliminated approximately 41,445 positions comprised of employee separations, as well as the elimination of contractors and vacant positions. The Company expects to substantially complete the remaining actions under these programs by the end of 2017 and incur approximately $500 million of additional pretax costs. The Company estimates that approximately two-thirds of the cumulative pretax costs will result in cash outlays, primarily related to employee separation expense. Approximately one-third of the cumulative pretax costs are non-cash, relating primarily to the accelerated depreciation of facilities to be closed or divested.

For segment reporting, restructuring charges are unallocated expenses.

The following tables summarize the charges related to restructuring program activities by type of cost:

	Three Months Ended March 31, 2017
($ in millions)	Separation Costs		Accelerated Depreciation			Other		Total
Materials and production	$	—	$	51		$	12	$	63
Marketing and administrative	—		—			1		1
Research and development	—		(2		)	2		—
Restructuring costs	84		—			67		151
	$	84	$	49		$	82	$	215

	Three Months Ended March 31, 2016
($ in millions)	Separation Costs		Accelerated Depreciation		Other		Total
Materials and production	$	—	$	22	$	25	$	47
Marketing and administrative	—		3		—		3
Research and development	—		55		—		55
Restructuring costs	26		—		65		91
	$	26	$	80	$	90	$	196

Separation costs are associated with actual headcount reductions, as well as those headcount reductions which were probable and could be reasonably estimated. In the first quarter of 2017 and 2016, approximately 545 positions and 470 positions, respectively, were eliminated under restructuring program activities.

Accelerated depreciation costs primarily relate to manufacturing, research and administrative facilities and equipment to be sold or closed as part of the programs. Accelerated depreciation costs represent the difference between the depreciation expense to be recognized over the revised useful life of the asset, based upon the anticipated date the site will be closed or divested or the equipment disposed of, and depreciation expense as determined utilizing the useful life prior to the restructuring actions.

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Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

All of the sites have and will continue to operate up through the respective closure dates and, since future undiscounted cash flows were sufficient to recover the respective book values, Merck is recording accelerated depreciation over the revised useful life of the site assets. Anticipated site closure dates, particularly related to manufacturing locations, have been and may continue to be adjusted to reflect changes resulting from regulatory or other factors.

Other activity in 2017 and 2016 includes asset abandonment, shut-down and other related costs, as well as pretax gains and losses resulting from sales of facilities and related assets. Additionally, other activity includes certain employee-related costs associated with pension and other postretirement benefit plans (see Note 10) and share-based compensation.

The following table summarizes the charges and spending relating to restructuring program activities for the three months ended March 31, 2017:

($ in millions)	Separation Costs			Accelerated Depreciation			Other			Total
Restructuring reserves January 1, 2017	$	395		$	—		$	146		$	541
Expense	84			49			82			215
(Payments) receipts, net	(103		)	—			(118		)	(221		)
Non-cash activity	—			(49		)	27			(22		)
Restructuring reserves March 31, 2017 (1)	$	376		$	—		$	137		$	513

⁽¹⁾  The remaining cash outlays are expected to be substantially completed by the end of 2017.

4. Financial Instruments

Derivative Instruments and Hedging Activities

The Company manages the impact of foreign exchange rate movements and interest rate movements on its earnings, cash flows and fair values of assets and liabilities through operational means and through the use of various financial instruments, including derivative instruments.

A significant portion of the Company’s revenues and earnings in foreign affiliates is exposed to changes in foreign exchange rates. The objectives and accounting related to the Company’s foreign currency risk management program, as well as its interest rate risk management activities are discussed below.

Foreign Currency Risk Management

The Company has established revenue hedging, balance sheet risk management and net investment hedging programs to protect against volatility of future foreign currency cash flows and changes in fair value caused by volatility in foreign exchange rates.

The objective of the revenue hedging program is to reduce the variability caused by changes in foreign exchange rates that would affect the U.S. dollar value of future cash flows derived from foreign currency denominated sales, primarily the euro and Japanese yen. To achieve this objective, the Company will hedge a portion of its forecasted foreign currency denominated third-party and intercompany distributor entity sales (forecasted sales) that are expected to occur over its planning cycle, typically no more than two years into the future. The Company will layer in hedges over time, increasing the portion of forecasted sales hedged as it gets closer to the expected date of the forecasted foreign currency denominated sales. The portion of forecasted sales hedged is based on assessments of cost-benefit profiles that consider natural offsetting exposures, revenue and exchange rate volatilities and correlations, and the cost of hedging instruments. The Company manages its anticipated transaction exposure principally with purchased local currency put options, forward contracts and purchased collar options.

The fair values of these derivative contracts are recorded as either assets (gain positions) or liabilities (loss positions) in the Condensed Consolidated Balance Sheet. Changes in the fair value of derivative contracts are recorded each period in either current earnings or Other comprehensive income (OCI), depending on whether the derivative is designated as part of a hedge transaction and, if so, the type of hedge transaction. For derivatives that are designated as cash flow hedges, the effective portion of the unrealized gains or losses on these contracts is recorded in Accumulated other comprehensive income (AOCI) and reclassified into Sales when the hedged anticipated revenue is recognized. The hedge relationship is highly effective and hedge ineffectiveness has been de minimis. For those derivatives which are not designated as cash flow hedges, but serve as economic hedges of forecasted sales, unrealized gains or losses are recorded in Sales each period. The cash flows from both designated and non-designated contracts are reported as operating activities in the Condensed Consolidated Statement of Cash Flows. The Company does not enter into derivatives for trading or speculative purposes.

The Company manages operating activities and net asset positions at each local subsidiary in order to mitigate the effects of exchange on monetary assets and liabilities. The Company also uses a balance sheet risk management program to mitigate the exposure of net monetary assets that are denominated in a currency other than a subsidiary’s functional currency from the effects of volatility in foreign exchange. In these instances, Merck principally utilizes forward exchange contracts to offset the

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Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

effects of exchange on exposures denominated in developed country currencies, primarily the euro and Japanese yen. For exposures in developing country currencies, the Company will enter into forward contracts to partially offset the effects of exchange on exposures when it is deemed economical to do so based on a cost-benefit analysis that considers the magnitude of the exposure, the volatility of the exchange rate and the cost of the hedging instrument. The cash flows from these contracts are reported as operating activities in the Condensed Consolidated Statement of Cash Flows.

Monetary assets and liabilities denominated in a currency other than the functional currency of a given subsidiary are remeasured at spot rates in effect on the balance sheet date with the effects of changes in spot rates reported in Other (income) expense, net. The forward contracts are not designated as hedges and are marked to market through Other (income) expense, net. Accordingly, fair value changes in the forward contracts help mitigate the changes in the value of the remeasured assets and liabilities attributable to changes in foreign currency exchange rates, except to the extent of the spot-forward differences. These differences are not significant due to the short-term nature of the contracts, which typically have average maturities at inception of less than one year.

The Company may also use forward exchange contracts to hedge its net investment in foreign operations against movements in exchange rates. The forward contracts are designated as hedges of the net investment in a foreign operation. The Company hedges a portion of the net investment in certain of its foreign operations and measures ineffectiveness based upon changes in spot foreign exchange rates that are recorded in Other (income) expense, net. The effective portion of the unrealized gains or losses on these contracts is recorded in foreign currency translation adjustment within OCI, and remains in AOCI until either the sale or complete or substantially complete liquidation of the subsidiary. The cash flows from these contracts are reported as investing activities in the Condensed Consolidated Statement of Cash Flows.

Foreign exchange risk is also managed through the use of foreign currency debt. The Company’s senior unsecured euro-denominated notes have been designated as, and are effective as, economic hedges of the net investment in a foreign operation. Accordingly, foreign currency transaction gains or losses due to spot rate fluctuations on the euro-denominated debt instruments are included in foreign currency translation adjustment within OCI. Included in the cumulative translation adjustment are pretax losses of $135 million and $58 million for the first three months of 2017 and 2016, respectively, from the euro-denominated notes.

Interest Rate Risk Management

The Company may use interest rate swap contracts on certain investing and borrowing transactions to manage its net exposure to interest rate changes and to reduce its overall cost of borrowing. The Company does not use leveraged swaps and, in general, does not leverage any of its investment activities that would put principal capital at risk.

At March 31, 2017, the Company was a party to 26 pay-floating, receive-fixed interest rate swap contracts designated as fair value hedges of fixed-rate notes in which the notional amounts match the amount of the hedged fixed-rate notes as detailed in the table below.

($ in millions)	March 31, 2017
Debt Instrument	Par Value of Debt		Number of Interest Rate Swaps Held	Total Swap Notional Amount
1.30% notes due 2018	$	1,000	4	$	1,000
5.00% notes due 2019	1,250		3	550
1.85% notes due 2020	1,250		5	1,250
3.875% notes due 2021	1,150		5	1,150
2.40% notes due 2022	1,000		4	1,000
2.35% notes due 2022	1,250		5	1,250

The interest rate swap contracts are designated hedges of the fair value changes in the notes attributable to changes in the benchmark London Interbank Offered Rate (LIBOR) swap rate. The fair value changes in the notes attributable to changes in the LIBOR swap rate are recorded in interest expense and offset by the fair value changes in the swap contracts. The cash flows from these contracts are reported as operating activities in the Condensed Consolidated Statement of Cash Flows.

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Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Presented in the table below is the fair value of derivatives on a gross basis segregated between those derivatives that are designated as hedging instruments and those that are not designated as hedging instruments:

		March 31, 2017						December 31, 2016
		Fair Value of Derivative				U.S. Dollar Notional		Fair Value of Derivative				U.S. Dollar Notional
($ in millions)	Balance Sheet Caption	Asset		Liability				Asset		Liability
Derivatives Designated as Hedging Instruments
Interest rate swap contracts	Other assets	$	11	$	—	$	2,700	$	20	$	—	$	2,700
Interest rate swap contracts	Other noncurrent liabilities	—		35		3,500		—		29		3,500
Foreign exchange contracts	Other current assets	330		—		5,049		616		—		6,063
Foreign exchange contracts	Other assets	56		—		1,815		129		—		2,075
Foreign exchange contracts	Accrued and other current liabilities	—		21		915		—		1		48
Foreign exchange contracts	Other noncurrent liabilities	—		1		20		—		1		12
		$	397	$	57	$	13,999	$	765	$	31	$	14,398
Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts	Other current assets	$	232	$	—	$	8,037	$	230	$	—	$	8,210
Foreign exchange contracts	Accrued and other current liabilities	—		89		6,479		—		103		2,931
		$	232	$	89	$	14,516	$	230	$	103	$	11,141
		$	629	$	146	$	28,515	$	995	$	134	$	25,539

As noted above, the Company records its derivatives on a gross basis in the Condensed Consolidated Balance Sheet. The Company has master netting agreements with several of its financial institution counterparties (see Concentrations of Credit Risk below). The following table provides information on the Company’s derivative positions subject to these master netting arrangements as if they were presented on a net basis, allowing for the right of offset by counterparty and cash collateral exchanged per the master agreements and related credit support annexes:

	March 31, 2017						December 31, 2016
($ in millions)	Asset			Liability			Asset			Liability
Gross amounts recognized in the consolidated balance sheet	$	629		$	146		$	995		$	134
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet	(144		)	(144		)	(131		)	(131		)
Cash collateral received	(222		)	—			(529		)	—
Net amounts	$	263		$	2		$	335		$	3

The table below provides information on the location and pretax gain or loss amounts for derivatives that are: (i) designated in a fair value hedging relationship, (ii) designated in a foreign currency cash flow hedging relationship and (iii) not designated in a hedging relationship:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Derivatives designated in a fair value hedging relationship
Interest rate swap contracts
Amount of loss (gain) recognized in Other (income) expense, net on derivatives (1)	$	15		$	(150	)
Amount of (gain) loss recognized in Other (income) expense, net on hedged item (1)	(16		)	147
Derivatives designated in foreign currency cash flow hedging relationships
Foreign exchange contracts
Amount of gain reclassified from AOCI to Sales	(94		)	(143		)
Amount of loss recognized in OCI on derivatives	263			167
Derivatives not designated in a hedging relationship
Foreign exchange contracts
Amount of (gain) loss recognized in Other (income) expense, net on derivatives (2)	(47		)	24

⁽¹⁾ There was $1 million and $3 million of ineffectiveness on the hedge during the first quarter of 2017 and 2016, respectively.

⁽²⁾ These derivative contracts mitigate changes in the value of remeasured foreign currency denominated monetary assets and liabilities attributable to changes in foreign currency exchange rates.

At March 31, 2017, the Company estimates $167 million of pretax net unrealized gains on derivatives maturing within the next 12 months that hedge foreign currency denominated sales over that same period will be reclassified from AOCI to Sales. The amount ultimately reclassified to Sales may differ as foreign exchange rates change. Realized gains and losses are ultimately determined by actual exchange rates at maturity.

- 10 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Investments in Debt and Equity Securities

Information on investments in debt and equity securities is as follows:

	March 31, 2017									December 31, 2016
	Fair Value		Amortized Cost		Gross Unrealized					Fair Value		Amortized Cost		Gross Unrealized
($ in millions)					Gains		Losses							Gains		Losses
Corporate notes and bonds	$	10,445	$	10,455	$	19	$	(29	)	$	10,577	$	10,601	$	15	$	(39	)
U.S. government and agency securities	2,011		2,021		1		(11		)	2,232		2,244		1		(13		)
Asset-backed securities	1,410		1,411		2		(3		)	1,376		1,380		1		(5		)
Commercial paper	773		773		—		—			4,330		4,330		—		—
Mortgage-backed securities	712		717		—		(5		)	796		801		1		(6		)
Foreign government bonds	560		561		1		(2		)	519		521		—		(2		)
Equity securities	356		278		79		(1		)	349		281		71		(3		)
	$	16,267	$	16,216	$	102	$	(51	)	$	20,179	$	20,158	$	89	$	(68	)

Available-for-sale debt securities included in Short-term investments totaled $3.5 billion at March 31, 2017. Of the remaining debt securities, $10.6 billion mature within five years. At March 31, 2017 and December 31, 2016, there were no debt securities pledged as collateral.

Fair Value Measurements

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company uses a fair value hierarchy which maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. There are three levels of inputs used to measure fair value with Level 1 having the highest priority and Level 3 having the lowest:

Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 - Unobservable inputs that are supported by little or no market activity. Level 3 assets or liabilities are those whose values are determined using pricing models, discounted cash flow methodologies, or similar techniques with significant unobservable inputs, as well as assets or liabilities for which the determination of fair value requires significant judgment or estimation.

If the inputs used to measure the financial assets and liabilities fall within more than one level described above, the categorization is based on the lowest level input that is significant to the fair value measurement of the instrument.

- 11 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

Financial assets and liabilities measured at fair value on a recurring basis are summarized below:

	Fair Value Measurements Using								Fair Value Measurements Using
	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total		Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
($ in millions)	March 31, 2017								December 31, 2016
Assets
Investments
Corporate notes and bonds	$	—	$	10,287	$	—	$	10,287	$	—	$	10,389	$	—	$	10,389
U.S. government and agency securities	66		1,647		—		1,713		29		1,890		—		1,919
Asset-backed securities (1)	—		1,312		—		1,312		—		1,257		—		1,257
Commercial paper	—		773		—		773		—		4,330		—		4,330
Mortgage-backed securities (1)	—		595		—		595		—		628		—		628
Foreign government bonds	—		559		—		559		—		518		—		518
Equity securities	198		—		—		198		201		—		—		201
	264		15,173		—		15,437		230		19,012		—		19,242
Other assets
U.S. government and agency securities	—		298		—		298		—		313		—		313
Corporate notes and bonds	—		158		—		158		—		188		—		188
Mortgage-backed securities (1)	—		117		—		117		—		168		—		168
Asset-backed securities (1)	—		98		—		98		—		119		—		119
Foreign government bonds	—		1		—		1		—		1		—		1
Equity securities	158		—		—		158		148		—		—		148
	158		672		—		830		148		789		—		937
Derivative assets (2)
Purchased currency options	—		354		—		354		—		644		—		644
Forward exchange contracts	—		264		—		264		—		331		—		331
Interest rate swaps	—		11		—		11		—		20		—		20
	—		629		—		629		—		995		—		995
Total assets	$	422	$	16,474	$	—	$	16,896	$	378	$	20,796	$	—	$	21,174
Liabilities
Other liabilities
Contingent consideration	$	—	$	—	$	925	$	925	$	—	$	—	$	891	$	891
Derivative liabilities (2)
Forward exchange contracts	—		110		—		110		—		93		—		93
Interest rate swaps	—		35		—		35		—		29		—		29
Written currency options	—		1		—		1		—		12		—		12
	—		146		—		146		—		134		—		134
Total liabilities	$	—	$	146	$	925	$	1,071	$	—	$	134	$	891	$	1,025

⁽¹⁾  Primarily all of the asset-backed securities are highly-rated (Standard & Poor’s rating of AAA and Moody’s Investors Service rating of Aaa), secured primarily by auto loan, credit card and student loan receivables, with weighted-average lives of primarily 5 years or less. Mortgage-backed securities represent AAA-rated securities issued or unconditionally guaranteed as to payment of principal and interest by U.S. government agencies.

⁽²⁾  The fair value determination of derivatives includes the impact of the credit risk of counterparties to the derivatives and the Company’s own credit risk, the effects of which were not significant.

There were no transfers between Level 1 and Level 2 during the first three months of 2017. As of March 31, 2017, Cash and cash equivalents of $11.7 billion included $10.9 billion of cash equivalents (considered Level 2 in the fair value hierarchy).

- 12 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Contingent Consideration

Summarized information about the changes in liabilities for contingent consideration is as follows:

	Three Months Ended March 31,
($ in millions)	2017		2016
Fair value January 1	$	891	$	590
Changes in fair value (1)	34		10
Additions	—		77
Payments	—		(25		)
Fair value March 31	$	925	$	652

⁽¹⁾ Recorded in Research and development expenses, Materials and production costs and Other (income) expense, net. Includes cumulative translation adjustments.

The additions to contingent consideration in the first quarter of 2016 relate to the acquisition of IOmet (see Note 2). The payments of contingent consideration in the first quarter of 2016 relate to the first commercial sale of Zerbaxa in the European Union.

Other Fair Value Measurements

Some of the Company’s financial instruments, such as cash and cash equivalents, receivables and payables, are reflected in the balance sheet at carrying value, which approximates fair value due to their short-term nature.

The estimated fair value of loans payable and long-term debt (including current portion) at March 31, 2017, was $29.3 billion compared with a carrying value of $28.5 billion and at December 31, 2016, was $25.7 billion compared with a carrying value of $24.8 billion. Fair value was estimated using recent observable market prices and would be considered Level 2 in the fair value hierarchy.

Concentrations of Credit Risk

On an ongoing basis, the Company monitors concentrations of credit risk associated with corporate and government issuers of securities and financial institutions with which it conducts business. Credit exposure limits are established to limit a concentration with any single issuer or institution. Cash and investments are placed in instruments that meet high credit quality standards as specified in the Company’s investment policy guidelines.

The majority of the Company’s accounts receivable arise from product sales in the United States and Europe and are primarily due from drug wholesalers and retailers, hospitals, government agencies, managed health care providers and pharmacy benefit managers. The Company monitors the financial performance and creditworthiness of its customers so that it can properly assess and respond to changes in their credit profile. The Company also continues to monitor economic conditions, including the volatility associated with international sovereign economies, and associated impacts on the financial markets and its business, taking into consideration global economic conditions and the ongoing sovereign debt issues in certain European countries. At March 31, 2017, the Company’s total net accounts receivable outstanding for more than one year were approximately $135 million. The Company does not expect to have write-offs or adjustments to accounts receivable which would have a material adverse effect on its financial position, liquidity or results of operations.

Derivative financial instruments are executed under International Swaps and Derivatives Association master agreements. The master agreements with several of the Company’s financial institution counterparties also include credit support annexes. These annexes contain provisions that require collateral to be exchanged depending on the value of the derivative assets and liabilities, the Company’s credit rating, and the credit rating of the counterparty. As of March 31, 2017 and December 31, 2016, the Company had received cash collateral of $222 million and $529 million, respectively, from various counterparties and the obligation to return such collateral is recorded in Accrued and other current liabilities. The Company had not advanced any cash collateral to counterparties as of March 31, 2017 or December 31, 2016.

- 13 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

5. Inventories

Inventories consisted of:

($ in millions)	March 31, 2017		December 31, 2016
Finished goods	$	1,355	$	1,304
Raw materials and work in process	4,446		4,222
Supplies	160		155
Total (approximates current cost)	5,961		5,681
Increase to LIFO costs	275		302
	$	6,236	$	5,983
Recognized as:
Inventories	$	5,146	$	4,866
Other assets	1,090		1,117

Amounts recognized as Other assets are comprised almost entirely of raw materials and work in process inventories. At March 31, 2017 and December 31, 2016, these amounts included $1.0 billion of inventories not expected to be sold within one year. In addition, these amounts included $80 million at March 31, 2017 and December 31, 2016 of inventories produced in preparation for product launches.

6. Other Intangibles

In connection with acquisitions, the Company measures the fair value of marketed products and research and development pipeline programs and capitalizes these amounts. See Note 2 for information on intangible assets acquired as a result of business acquisitions in the first quarter of 2017 and 2016.

During the first quarter of 2016, the Company recorded an intangible asset impairment charge of $252 million within Materials and production costs related to Zontivity, a product for the reduction of thrombotic cardiovascular events in patients with a history of myocardial infarction or with peripheral arterial disease. In March 2016, following several business decisions that reduced sales expectations for Zontivity in the United States and Europe, the Company lowered its cash flow projections for Zontivity. The Company utilized market participant assumptions and considered several different scenarios to determine the fair value of the intangible asset related to Zontivity that, when compared with its related carrying value, resulted in the impairment charge noted above.

Also during the first quarter of 2016, the Company recorded $25 million of IPR&D impairment charges within Research and development expenses primarily related to deprioritized pipeline programs that were deemed to have no alternative use during the period.

The Company may recognize additional non-cash impairment charges in the future related to other marketed products or pipeline programs and such charges could be material.

7. Contingencies

The Company is involved in various claims and legal proceedings of a nature considered normal to its business, including product liability, intellectual property, and commercial litigation, as well as certain additional matters including environmental matters. In the opinion of the Company, it is unlikely that the resolution of these matters will be material to the Company’s financial position, results of operations or cash flows.

Given the nature of the litigation discussed below and the complexities involved in these matters, the Company is unable to reasonably estimate a possible loss or range of possible loss for such matters until the Company knows, among other factors, (i) what claims, if any, will survive dispositive motion practice, (ii) the extent of the claims, including the size of any potential class, particularly when damages are not specified or are indeterminate, (iii) how the discovery process will affect the litigation, (iv) the settlement posture of the other parties to the litigation and (v) any other factors that may have a material effect on the litigation.

The Company records accruals for contingencies when it is probable that a liability has been incurred and the amount can be reasonably estimated. These accruals are adjusted periodically as assessments change or additional information becomes available. For product liability claims, a portion of the overall accrual is actuarially determined and considers such factors as past experience, number of claims reported and estimates of claims incurred but not yet reported. Individually significant contingent losses are accrued when probable and reasonably estimable. Legal defense costs expected to be incurred in connection with a loss contingency are accrued when probable and reasonably estimable.

- 14 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

The Company’s decision to obtain insurance coverage is dependent on market conditions, including cost and availability, existing at the time such decisions are made. The Company has evaluated its risks and has determined that the cost of obtaining product liability insurance outweighs the likely benefits of the coverage that is available and, as such, has no insurance for most product liabilities effective August 1, 2004.

Product Liability Litigation

Fosamax

As previously disclosed, Merck is a defendant in product liability lawsuits in the United States involving Fosamax (Fosamax Litigation). As of March 31, 2017, approximately 4,215 cases are filed and pending against Merck in either federal or state court. In approximately 20 of these actions, plaintiffs allege, among other things, that they have suffered osteonecrosis of the jaw (ONJ), generally subsequent to invasive dental procedures, such as tooth extraction or dental implants and/or delayed healing, in association with the use of Fosamax. In addition, plaintiffs in approximately 4,195 of these actions generally allege that they sustained femur fractures and/or other bone injuries (Femur Fractures) in association with the use of Fosamax.

Cases Alleging ONJ and/or Other Jaw Related Injuries

In August 2006, the Judicial Panel on Multidistrict Litigation (JPML) ordered that certain Fosamax product liability cases pending in federal courts nationwide should be transferred and consolidated into one multidistrict litigation (Fosamax ONJ MDL) for coordinated pre-trial proceedings.

In December 2013, Merck reached an agreement in principle with the Plaintiffs’ Steering Committee (PSC) in the Fosamax ONJ MDL to resolve pending ONJ cases not on appeal in the Fosamax ONJ MDL and in the state courts for an aggregate amount of $27.7 million. Merck and the PSC subsequently formalized the terms of this agreement in a Master Settlement Agreement (ONJ Master Settlement Agreement) that was executed in April 2014 and included over 1,200 plaintiffs. In July 2014, Merck elected to proceed with the ONJ Master Settlement Agreement at a reduced funding level of $27.3 million since the participation level was approximately 95%. Merck has fully funded the ONJ Master Settlement Agreement and the escrow agent under the agreement has been making settlement payments to qualifying plaintiffs. The ONJ Master Settlement Agreement has no effect on the cases alleging Femur Fractures discussed below.

Discovery is currently ongoing in some of the approximately 20 remaining ONJ cases that are pending in various federal and state courts and the Company intends to defend against these lawsuits.

Cases Alleging Femur Fractures

In March 2011, Merck submitted a Motion to Transfer to the JPML seeking to have all federal cases alleging Femur Fractures consolidated into one multidistrict litigation for coordinated pre-trial proceedings. The Motion to Transfer was granted in May 2011, and all federal cases involving allegations of Femur Fracture have been or will be transferred to a multidistrict litigation in the District of New Jersey (Femur Fracture MDL). In the only bellwether case tried to date in the Femur Fracture MDL, Glynn v. Merck, the jury returned a verdict in Merck’s favor. In addition, in June 2013, the Femur Fracture MDL court granted Merck’s motion for judgment as a matter of law in the Glynn case and held that the plaintiff’s failure to warn claim was preempted by federal law. The Glynn decision was not appealed by plaintiff.

In August 2013, the Femur Fracture MDL court entered an order requiring plaintiffs in the Femur Fracture MDL to show cause why those cases asserting claims for a femur fracture injury that took place prior to September 14, 2010, should not be dismissed based on the court’s preemption decision in the Glynn case. Pursuant to the show cause order, in March 2014, the Femur Fracture MDL court dismissed with prejudice approximately 650 cases on preemption grounds. Plaintiffs in approximately 515 of those cases appealed that decision to the U.S. Court of Appeals for the Third Circuit (Third Circuit). The Femur Fracture MDL court also dismissed without prejudice another approximately 540 cases pending plaintiffs’ appeal of the preemption ruling to the Third Circuit. On March 22, 2017, the Third Circuit issued a decision reversing the Femur Fracture MDL court’s preemption ruling and remanding the appealed cases back to the Femur Fracture MDL court. On April 5, 2017, Merck filed a petition seeking a rehearing on the Third Circuit’s March 22, 2017 decision, which was denied on April 24, 2017.

In addition, in June 2014, the Femur Fracture MDL court granted Merck summary judgment in the Gaynor v. Merck case and found that Merck’s updates in January 2011 to the Fosamax label regarding atypical femur fractures were adequate as a matter of law and that Merck adequately communicated those changes. The plaintiffs in Gaynor did not appeal the Femur Fracture MDL court’s findings with respect to the adequacy of the 2011 label change but did appeal the dismissal of their case based on preemption grounds, and the Third Circuit subsequently reversed that dismissal in its March 22, 2017 decision. In August 2014, Merck filed a motion requesting that the Femur Fracture MDL court enter a further order requiring all plaintiffs in the Femur Fracture MDL who claim that the 2011 Fosamax label is inadequate and the proximate cause of their alleged injuries to show cause why their cases should not be dismissed based on the court’s preemption decision and its ruling in the Gaynor case. In November 2014, the court granted Merck’s motion and entered the requested show cause order. No plaintiffs responded to or appealed the November 2014 show cause order.

- 15 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

As of March 31, 2017, seven cases were pending in the Femur Fracture MDL, excluding the 515 cases dismissed with prejudice on preemption grounds that are pending the final resolution of all appeals of the Femur Fracture MDL court’s March 2014 preemption decision and the 540 cases dismissed without prejudice that are also pending the final resolution of the aforementioned appeal.

As of March 31, 2017, approximately 2,855 cases alleging Femur Fractures have been filed in New Jersey state court and are pending before Judge Jessica Mayer in Middlesex County. The parties selected an initial group of 30 cases to be reviewed through fact discovery. Two additional groups of 50 cases each to be reviewed through fact discovery were selected in November 2013 and March 2014, respectively. A further group of 25 cases to be reviewed through fact discovery was selected by Merck in July 2015, and Merck has continued to select additional cases to be reviewed through fact discovery during 2016 and 2017.

As of March 31, 2017, approximately 280 cases alleging Femur Fractures have been filed and are pending in California state court. A petition was filed seeking to coordinate all Femur Fracture cases filed in California state court before a single judge in Orange County, California. The petition was granted and Judge Thierry Colaw is currently presiding over the coordinated proceedings. In March 2014, the court directed that a group of 10 discovery pool cases be reviewed through fact discovery and subsequently scheduled the Galper v. Merck case, which plaintiffs selected, as the first trial. The Galper trial began in February 2015 and the jury returned a verdict in Merck’s favor in April 2015, and plaintiff has appealed that verdict to the California appellate court. Oral argument on plaintiff’s appeal in Galper was held on November 17, 2016 and, on April 24, 2017, the California appellate court issued a decision affirming the lower court’s judgment in favor of Merck. The next Femur Fracture trial in California that was scheduled to begin in April 2016 was stayed at plaintiffs’ request and a new trial date has not been set.

Additionally, there are five Femur Fracture cases pending in other state courts.

Discovery is ongoing in the Femur Fracture MDL and in state courts where Femur Fracture cases are pending and the Company intends to defend against these lawsuits.

Januvia/Janumet

As previously disclosed, Merck is a defendant in product liability lawsuits in the United States involving Januvia and/or Janumet. As of March 31, 2017, Merck is aware of approximately 1,200 product user claims alleging generally that use of Januvia and/or Janumet caused the development of pancreatic cancer and other injuries. These complaints were filed in several different state and federal courts.

Most of the claims were filed in a consolidated multidistrict litigation proceeding in the U.S. District Court for the Southern District of California called “In re Incretin-Based Therapies Products Liability Litigation” (MDL). The MDL includes federal lawsuits alleging pancreatic cancer due to use of the following medicines: Januvia, Janumet, Byetta and Victoza, the latter two of which are products manufactured by other pharmaceutical companies. The majority of claims not filed in the MDL were filed in the Superior Court of California, County of Los Angeles (California State Court).

In November 2015, the MDL and California State Court - in separate opinions - granted summary judgment to defendants on grounds of preemption. Of the approximately 1,200 product user claims, these rulings resulted in the dismissal of approximately 1,150 product user claims.

Plaintiffs are appealing the MDL and California State Court preemption rulings.

As of March 31, 2017, eight product users have claims pending against Merck in state courts other than the California State Court, including four active product user claims pending in Illinois state court. On March 30, 2017, the Illinois court held oral argument on Merck’s motion for summary judgment on grounds of preemption. A decision is expected in May 2017.

In addition to the claims noted above, the Company has agreed, as of March 31, 2017, to toll the statute of limitations for approximately 50 additional claims. The Company intends to continue defending against these lawsuits.

Propecia/Proscar

As previously disclosed, Merck is a defendant in product liability lawsuits in the United States involving Propecia and/or Proscar. As of March 31, 2017, approximately 1,260 lawsuits have been filed by plaintiffs who allege that they have experienced persistent sexual side effects following cessation of treatment with Propecia and/or Proscar. Approximately 50 of the plaintiffs also allege that Propecia or Proscar has caused or can cause prostate cancer, testicular cancer or male breast cancer. The lawsuits have been filed in various federal courts and in state court in New Jersey. The federal lawsuits have been consolidated for pretrial purposes in a federal multidistrict litigation before Judge Brian Cogan of the Eastern District of New York. The matters pending in state court in New Jersey have been consolidated before Judge Mayer in Middlesex County. In addition, there is one matter pending in state court in California and one matter pending in state court in Ohio. The Company intends to defend against these lawsuits.

- 16 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Commercial and Other Litigation

K-DUR Antitrust Litigation

In June 1997 and January 1998, Schering-Plough Corporation (Schering-Plough) settled patent litigation with Upsher-Smith, Inc. (Upsher-Smith) and ESI Lederle, Inc. (Lederle), respectively, relating to generic versions of Schering-Plough’s long-acting potassium chloride product supplement used by cardiac patients, for which Lederle and Upsher-Smith had filed Abbreviated New Drug Applications (ANDAs). Following the commencement of an administrative proceeding by the U.S. Federal Trade Commission in 2001 alleging anti-competitive effects from those settlements (which was resolved in Schering-Plough’s favor), putative class and non-class action suits were filed on behalf of direct and indirect purchasers of K‑DUR against Schering-Plough, Upsher-Smith and Lederle and were consolidated in a multidistrict litigation in the U.S. District Court for the District of New Jersey. These suits claimed violations of federal and state antitrust laws, as well as other state statutory and common law causes of action, and sought unspecified damages. In April 2008, the indirect purchasers voluntarily dismissed their case. In February 2016, the District Court denied the Company’s motion for summary judgment relating to all of the direct purchasers’ claims concerning the settlement with Upsher-Smith and granted the Company’s motion for summary judgment relating to all of the direct purchasers’ claims concerning the settlement with Lederle. In anticipation of trial, the parties filed motions to exclude certain expert opinions and other evidence, and defendants filed a motion for summary judgment.

As previously disclosed, in February 2017, Merck and Upsher-Smith reached a settlement in principle with the class of direct purchasers and the opt-outs to the class. Merck will contribute approximately $80 million in the aggregate towards the overall settlement. On April 5, 2017, the claims of the opt-outs were dismissed with prejudice pursuant to a written settlement agreement with those parties. Merck and Upsher-Smith are working with the class of direct purchasers on a definitive settlement agreement of its claims, which will be subject to approval by the District Court.

Merck KGaA Litigation

In January 2016, to protect its long-established brand rights in the United States, the Company filed a lawsuit against Merck KGaA, Darmstadt, Germany (KGaA), operating as the EMD Group in the United States, alleging it improperly uses the name “Merck” in the United States. KGaA has filed suit against the Company in France, the United Kingdom (UK), Germany, Switzerland, Mexico, and India alleging breach of the parties’ co-existence agreement, unfair competition and/or trademark infringement. In December 2015, the Paris Court of First Instance issued a judgment finding that certain activities by the Company directed towards France did not constitute trademark infringement and unfair competition while other activities were found to infringe. The Company and KGaA have both appealed the decision, and the appeal is scheduled to be heard in May 2017. In January 2016, the UK High Court issued a judgment finding that the Company had breached the co-existence agreement and infringed KGaA’s trademark rights as a result of certain activities directed towards the UK based on use of the word MERCK on promotional and information activity. As noted in the UK decision, this finding was not based on the Company’s use of the sign MERCK in connection with the sale of products or any material pharmaceutical business transacted in the UK. The Company and KGaA have both appealed this decision, and the appeal is scheduled to be heard in June 2017.

Patent Litigation

From time to time, generic manufacturers of pharmaceutical products file ANDAs with the U.S. Food and Drug Administration (FDA) seeking to market generic forms of the Company’s products prior to the expiration of relevant patents owned by the Company. To protect its patent rights, the Company may file patent infringement lawsuits against such generic companies. Certain products of the Company (or products marketed via agreements with other companies) currently involved in such patent infringement litigation in the United States include: Invanz, Nasonex, Noxafil, and NuvaRing. Similar lawsuits defending the Company’s patent rights may exist in other countries. The Company intends to vigorously defend its patents, which it believes are valid, against infringement by companies attempting to market products prior to the expiration of such patents. As with any litigation, there can be no assurance of the outcomes, which, if adverse, could result in significantly shortened periods of exclusivity for these products and, with respect to products acquired through acquisitions, potentially significant intangible asset impairment charges.

Invanz — In July 2014, a patent infringement lawsuit was filed in the United States against Hospira, Inc. (Hospira) in respect of Hospira’s application to the FDA seeking pre-patent expiry approval to market a generic version of Invanz. The trial in this matter was held in April 2016 and, in October 2016, the district court ruled that the patent is valid and infringed. In August 2015, a patent infringement lawsuit was filed in the United States against Savior Lifetec Corporation (Savior) in respect of Savior’s application to the FDA seeking pre-patent expiry approval to market a generic version of Invanz. The lawsuit automatically stays FDA approval of Savior’s application until November 2017 or until an adverse court decision, if any, whichever may occur earlier.

Nasonex — In July 2014, a patent infringement lawsuit was filed in the United States against Teva Pharmaceuticals USA, Inc. (Teva Pharma) in respect of Teva Pharma’s application to the FDA seeking pre-patent expiry approval to market a generic version of Nasonex. The trial in this matter was held in June 2016. In November 2016, the district court ruled that the patent was valid but not infringed. In March 2017, the parties reached a settlement whereby Teva Pharma can launch its generic version in September 2017, or earlier under certain conditions.

- 17 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

In March 2015, a patent infringement lawsuit was filed in the United States against Amneal Pharmaceuticals LLC (Amneal) in respect of Amneal’s application to the FDA seeking pre-patent expiry approval to market a generic version of Nasonex. The trial in this matter was held in June 2016. In January 2017, the district court ruled that the patent was valid but not infringed. The Company has appealed this decision.

A previous decision, issued in June 2013, held that the Merck patent in the Teva Pharma and Amneal lawsuits covering mometasone furoate monohydrate was valid, but that it was not infringed by Apotex Corp.’s proposed product. In April 2015, a patent infringement lawsuit was filed against Apotex Inc. and Apotex Corp. (Apotex) in respect of Apotex’s now-launched product that the Company believes differs from the generic version in the previous lawsuit.

Noxafil —In August 2015, the Company filed a lawsuit against Actavis Laboratories Fl, Inc. (Actavis) in the United States in respect of that company’s application to the FDA seeking pre-patent expiry approval to sell a generic version of Noxafil. The lawsuit automatically stays FDA approval of Actavis’s application until December 2017 or until an adverse court decision, if any, whichever may occur earlier. The trial in this matter is currently scheduled to begin in July 2017. In March 2016, the Company filed a lawsuit against Roxane Laboratories, Inc. (Roxane) in the United States in respect of that company’s application to the FDA seeking pre-patent expiry approval to sell a generic version of Noxafil. The lawsuit automatically stays FDA approval of Roxane’s application until August 2018 or until an adverse court decision, if any, whichever may occur earlier. In February 2016, the Company filed a lawsuit against Par Sterile Products LLC, Par Pharmaceutical, Inc., Par Pharmaceutical Companies, Inc. and Par Pharmaceutical Holdings, Inc. (collectively, Par) in the United States in respect of that company’s application to the FDA seeking pre-patent expiry approval to sell a generic version of Noxafil. In October 2016, the parties reached a settlement whereby Par can launch its generic version in January 2023, or earlier under certain conditions.

NuvaRing — In December 2013, the Company filed a lawsuit against a subsidiary of Allergan plc in the United States in respect of that company’s application to the FDA seeking pre-patent expiry approval to sell a generic version of NuvaRing. The trial in this matter was held in January 2016. In August 2016, the district court ruled that the patent was invalid and the Company has appealed this decision. In September 2015, the Company filed a lawsuit against Teva Pharma in the United States in respect of that company’s application to the FDA seeking pre-patent expiry approval to sell a generic version of NuvaRing. Based on its ruling in the Allergan plc matter, the district court dismissed the Company’s lawsuit in December 2016. The Company has appealed this decision.

Anti-PD-1 Antibody Patent Oppositions and Litigation

As previously disclosed, Ono Pharmaceutical Co. (Ono) has a European patent (EP 1 537 878) (’878) that broadly claims the use of an anti-PD-1 antibody, such as the Company’s immunotherapy, Keytruda, for the treatment of cancer. Ono has previously licensed its commercial rights to an anti-PD-1 antibody to Bristol-Myers Squibb (BMS) in certain markets. BMS and Ono also own European Patent EP 2 161 336 (’336) that, as granted, broadly claimed anti-PD-1 antibodies that could include Keytruda.

As previously disclosed, the Company and BMS and Ono were engaged in worldwide litigation, including in the United States, over the validity and infringement of the ’878 patent, the ’336 patent and their equivalents.

In January 2017, the Company announced that it had entered into a settlement and license agreement with BMS and Ono resolving the worldwide patent infringement litigation related to the use of an anti-PD-1 antibody for the treatment of cancer, such as Keytruda. Under the settlement and license agreement, the Company made a one-time payment of $625 million (which was recorded as an expense in the Company’s 2016 financial results) to BMS and will pay royalties on the worldwide sales of Keytruda for a non-exclusive license to market Keytruda in any market in which it is approved. For global net sales of Keytruda, the Company will pay royalties as follows:

•6.5% of net sales occurring from January 1, 2017 through and including December 31, 2023; and

•2.5% of net sales occurring from January 1, 2024 through and including December 31, 2026.

The parties also agreed to dismiss all claims worldwide in the relevant legal proceedings.

In October 2015, PDL Biopharma (PDL) filed a lawsuit in the United States against the Company alleging that the manufacture of Keytruda infringed US Patent No. 5,693,761 (’761 patent), which expired in December 2014. This patent claims platform technology used in the creation and manufacture of recombinant antibodies and PDL is seeking damages for pre-expiry infringement of the ’761 patent. In April 2017, the parties reached a settlement pursuant to which, in exchange for a lump sum, PDL dismissed its lawsuit with prejudice and granted the Company a fully paid-up non-exclusive license to the ’761 patent.

In July 2016, the Company filed a declaratory judgment action in the United States against Genentech and City of Hope seeking a ruling that US Patent No. 7,923,221 (the Cabilly III patent), which claims platform technology used in the creation and manufacture of recombinant antibodies, is invalid and that Keytruda and bezlotoxumab do not infringe the Cabilly III patent. In July 2016, the Company also filed a petition in the USPTO for Inter Partes Review (IPR) of certain claims of US Patent

- 18 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

No. 6,331,415 (the Cabilly II patent), which claims platform technology used in the creation and manufacture of recombinant antibodies and is also owned by Genentech and City of Hope, as being invalid. In December 2016, the USPTO denied the petition but allowed the Company to join an IPR filed previously by another party. In May 2017, the parties reached a settlement pursuant to which the Company dismissed its lawsuit with prejudice and moved to terminate the IPR and Genentech and City of Hope granted the Company a fully paid-up non-exclusive license to the Cabilly II and Cabilly III patents.

Gilead Patent Litigation and Opposition

In August 2013, Gilead Sciences, Inc. (Gilead) filed a lawsuit in the U.S. District Court for the Northern District of California seeking a declaration that two Company patents were invalid and not infringed by the sale of their two sofosbuvir containing products, Solvadi and Harvoni. The Company filed a counterclaim that the sale of these products did infringe these two patents and sought a reasonable royalty for the past, present and future sales of these products. In March 2016, at the conclusion of a jury trial, the patents were found to be not invalid and infringed. The jury awarded the Company $200 million as a royalty for sales of these products up to December 2015. After the conclusion of the jury trial, the court held a bench trial on the equitable defenses raised by Gilead. In June 2016, the court found for Gilead and determined that Merck could not collect the jury award and that the patents were unenforceable with respect to Gilead. The Company has appealed the court’s decision. Gilead has also asked the court to overturn the jury’s decision on validity. The court held a hearing on Gilead’s motion in August 2016, and the court subsequently rejected Gilead’s request. The Company will pay 20%, net of legal fees, of damages or royalties, if any, that it receives to Ionis Pharmaceuticals, Inc.

The Company, through its Idenix Pharmaceuticals, Inc. subsidiary, has pending litigation against Gilead in the United States, the UK, Norway, Canada, Germany, France, and Australia based on different patent estates that would also be infringed by Gilead’s sales of these two products. Gilead has opposed the European patent at the European Patent Office (EPO). Trial in the United States was held in December 2016 and the jury returned a verdict for the Company, awarding damages of $2.54 billion. The Company is currently briefing post-trial motions, including on the issues of enhanced damages and future royalties. Gilead is briefing post-trial motions for judgment as a matter of law. In Australia and Canada, the Company was initially unsuccessful and those cases are currently under appeal. In the UK and Norway, the patent was held invalid and no further appeal was filed. The EPO opposition division revoked the European patent, and the Company has appealed this decision. The cases in France and Germany have been stayed pending the final decision of the EPO.

Other Litigation

There are various other pending legal proceedings involving the Company, principally product liability and intellectual property lawsuits. While it is not feasible to predict the outcome of such proceedings, in the opinion of the Company, either the likelihood of loss is remote or any reasonably possible loss associated with the resolution of such proceedings is not expected to be material to the Company’s financial position, results of operations or cash flows either individually or in the aggregate.

Legal Defense Reserves

Legal defense costs expected to be incurred in connection with a loss contingency are accrued when probable and reasonably estimable. Some of the significant factors considered in the review of these legal defense reserves are as follows: the actual costs incurred by the Company; the development of the Company’s legal defense strategy and structure in light of the scope of its litigation; the number of cases being brought against the Company; the costs and outcomes of completed trials and the most current information regarding anticipated timing, progression, and related costs of pre-trial activities and trials in the associated litigation. The amount of legal defense reserves as of March 31, 2017 and December 31, 2016 of approximately $175 million and $185 million, respectively, represents the Company’s best estimate of the minimum amount of defense costs to be incurred in connection with its outstanding litigation; however, events such as additional trials and other events that could arise in the course of its litigation could affect the ultimate amount of legal defense costs to be incurred by the Company. The Company will continue to monitor its legal defense costs and review the adequacy of the associated reserves and may determine to increase the reserves at any time in the future if, based upon the factors set forth, it believes it would be appropriate to do so.

- 19 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

8. Equity

	Common Stock			Other Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock					Non- Controlling Interests			Total
($ and shares in millions)	Shares	Par Value											Shares		Cost
Balance at January 1, 2016	3,577	$	1,788	$	40,222		$	45,348		$	(4,148	)	796		$	(38,534	)	$	91		$	44,767
Net income attributable to Merck & Co., Inc.	—	—		—			1,125			—			—		—			—			1,125
Other comprehensive loss, net of tax	—	—		—			—			(46		)	—		—			—			(46		)
Cash dividends declared on common stock	—	—		—			(1,281		)	—			—		—			—			(1,281		)
Treasury stock shares purchased	—	—		—			—			—			18		(913		)	—			(913		)
Share-based compensation plans and other	—	—		(77		)	—			—			(6	)	322			—			245
Net income attributable to noncontrolling interests	—	—		—			—			—			—		—			5			5
Distributions attributable to noncontrolling interests	—	—		—			—			—			—		—			(1		)	(1		)
Balance at March 31, 2016	3,577	$	1,788	$	40,145		$	45,192		$	(4,194	)	808		$	(39,125	)	$	95		$	43,901
Balance at January 1, 2017	3,577	$	1,788	$	39,939		$	44,133		$	(5,226	)	828		$	(40,546	)	$	220		$	40,308
Net income attributable to Merck & Co., Inc.	—	—		—			1,551			—			—		—			—			1,551
Other comprehensive income, net of tax	—	—		—			—			146			—		—			—			146
Cash dividends declared on common stock	—	—		—			(1,297		)	—			—		—			—			(1,297		)
Treasury stock shares purchased	—	—		—			—			—			16		(1,019		)	—			(1,019		)
Share-based compensation plans and other	—	—		(40		)	—			—			(7	)	408			—			368
Acquisition of Vallée	—	—		—			—			—			—		—			25			25
Net income attributable to noncontrolling interests	—	—		—			—			—			—		—			5			5
Other changes in noncontrolling ownership interests	—	—		—			—			—			—		—			1			1
Balance at March 31, 2017	3,577	$	1,788	$	39,899		$	44,387		$	(5,080	)	837		$	(41,157	)	$	251		$	40,088

9. Share-Based Compensation Plans

The Company has share-based compensation plans under which the Company grants restricted stock units (RSUs) and performance share units (PSUs) to certain management level employees. In addition, employees and non-employee directors may be granted options to purchase shares of Company common stock at the fair market value at the time of grant.

The following table provides the amounts of share-based compensation cost recorded in the Condensed Consolidated Statement of Income:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Pretax share-based compensation expense	$	74		$	68
Income tax benefit	(22		)	(20		)
Total share-based compensation expense, net of taxes	$	52		$	48

During the first three months of 2017 and 2016, the Company granted 86 thousand RSUs with a weighted-average grant date fair value of $64.20 per RSU and 133 thousand RSUs with a weighted-average grant date fair value of $48.83 per RSU, respectively. During the first three months of 2017 and 2016, the Company granted 190 thousand stock options with a weighted-average exercise price of $64.20 per option and 74 thousand stock options with a weighted-average exercise price of $48.83 per option, respectively. The weighted-average fair value of options granted for the first three months of 2017 and 2016 was $7.89 and $5.76 per option, respectively, and was determined using the following assumptions:

	Three Months Ended March 31,
	2017		2016
Expected dividend yield	3.7	%	3.8	%
Risk-free interest rate	2.0	%	1.3	%
Expected volatility	19.7	%	21.0	%
Expected life (years)	6.2		6.2

- 20 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

At March 31, 2017, there was $681 million of total pretax unrecognized compensation expense related to nonvested stock options, RSU and PSU awards which will be recognized over a weighted-average period of 2.4 years. The Company typically communicates the value of annual share-based compensation awards to employees during the first quarter, but the related share amounts are not established and communicated until early May. Therefore, while the number of RSU and stock option grants disclosed above do not reflect any amounts relating to the annual grants, share-based compensation costs for the first quarter of 2017 and 2016 and unrecognized compensation expense at March 31, 2017 reflect an impact relating to the awards communicated to employees. For segment reporting, share-based compensation costs are unallocated expenses.

10. Pension and Other Postretirement Benefit Plans

The Company has defined benefit pension plans covering eligible employees in the United States and in certain of its international subsidiaries. The net periodic benefit cost (credit) of such plans consisted of the following components:

	Three Months Ended   March 31,
	2017						2016
($ in millions)	U.S.			International			U.S.			International
Service cost	$	77		$	61		$	73		$	58
Interest cost	113			41			113			52
Expected return on plan assets	(218		)	(94		)	(210		)	(95		)
Amortization of unrecognized prior service credit	(13		)	(2		)	(14		)	(3		)
Net loss amortization	44			23			29			22
Termination benefits	5			1			4			—
Curtailments	3			—			—			1
	$	11		$	30		$	(5	)	$	35

The Company provides medical benefits, principally to its eligible U.S. retirees and similar benefits to their dependents, through its other postretirement benefit plans. The net cost (credit) of such plans consisted of the following components:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Service cost	$	14		$	13
Interest cost	20			21
Expected return on plan assets	(19		)	(35		)
Amortization of unrecognized prior service credit	(25		)	(26		)
Termination benefits	1			1
Curtailments	(3		)	(1		)
	$	(12	)	$	(27	)

In connection with restructuring actions (see Note 3), termination charges were recorded on pension and other postretirement benefit plans related to expanded eligibility for certain employees exiting Merck. Also, in connection with these restructuring actions, curtailments were recorded on pension and other postretirement benefit plans as reflected in the tables above.

- 21 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

11. Other (Income) Expense, Net

Other (income) expense, net, consisted of:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Interest income	$	(97	)	$	(79	)
Interest expense	182			172
Exchange (gains) losses	(8		)	38
Equity loss (income) from affiliates	13			(34		)
Other, net	(32		)	(49		)
	$	58		$	48

The change in equity loss (income) from affiliates in the first quarter of 2017 as compared with the first quarter of 2016 was driven primarily by certain research investment funds, which generated equity losses in the first quarter of 2017 compared with equity income in the first quarter of 2016, as well as by the termination of the SPMSD joint venture on December 31, 2016.

Interest paid for the three months ended March 31, 2017 and 2016 was $162 million and $160 million, respectively.

12. Taxes on Income

The effective income tax rates of 22.3% and 30.4% for the first quarter of 2017 and 2016, respectively, reflect the impacts of acquisition and divestiture-related costs and restructuring costs, partially offset by the beneficial impact of foreign earnings.

The Company is under examination by numerous tax authorities in various jurisdictions globally. The ultimate finalization of the Company’s examinations with relevant taxing authorities can include formal administrative and legal proceedings, which could have a significant impact on the timing of the reversal of unrecognized tax benefits. The Company believes that its reserves for uncertain tax positions are adequate to cover existing risks or exposures. However, there is one item that is currently under discussion with the Internal Revenue Service relating to the 2006 through 2008 examination. The Company has concluded that its position should be sustained upon audit. However, if this item were to result in an unfavorable outcome or settlement, it could have a material adverse impact on the Company’s financial position, liquidity and results of operations.

13. Earnings Per Share

The calculations of earnings per share are as follows:

	Three Months Ended   March 31,
($ and shares in millions except per share amounts)	2017		2016
Net income attributable to Merck & Co., Inc.	$	1,551	$	1,125
Average common shares outstanding	2,745		2,774
Common shares issuable (1)	21		21
Average common shares outstanding assuming dilution	2,766		2,795
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders	$	0.56	$	0.41
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders	$	0.56	$	0.40

⁽¹⁾  Issuable primarily under share-based compensation plans.

For the three months ended March 31, 2017 and 2016, 2 million and 10 million, respectively, of common shares issuable under share-based compensation plans were excluded from the computation of earnings per common share assuming dilution because the effect would have been antidilutive.

- 22 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

14. Other Comprehensive Income (Loss)

Changes in AOCI by component are as follows:

	Three Months Ended March 31,
($ in millions)	Derivatives				Investments				Employee Benefit Plans				Cumulative Translation Adjustment			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2016, net of taxes	$	404			$	41			$	(2,407	)		$	(2,186	)	$	(4,148	)
Other comprehensive income (loss) before reclassification adjustments, pretax	(167		)		54				(35		)		99			(49		)
Tax	58				16				(1		)		22			95
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(109		)		70				(36		)		121			46
Reclassification adjustments, pretax	(143		)	(1)	(11		)	(2)	7			(3)	—			(147		)
Tax	50				4				1				—			55
Reclassification adjustments, net of taxes	(93		)		(7		)		8				—			(92		)
Other comprehensive income (loss), net of taxes	(202		)		63				(28		)		121			(46		)
Balance March 31, 2016, net of taxes	$	202			$	104			$	(2,435	)		$	(2,065	)	$	(4,194	)
Balance January 1, 2017, net of taxes	$	338			$	(3	)		$	(3,206	)		$	(2,355	)	$	(5,226	)
Other comprehensive income (loss) before reclassification adjustments, pretax	(263		)		87				(4		)		263			83
Tax	92				(7		)		9				46			140
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(171		)		80				5				309			223
Reclassification adjustments, pretax	(95		)	(1)	(57		)	(2)	28			(3)	—			(124		)
Tax	34				20				(7		)		—			47
Reclassification adjustments, net of taxes	(61		)		(37		)		21				—			(77		)
Other comprehensive income (loss), net of taxes	(232		)		43				26				309			146
Balance March 31, 2017, net of taxes	$	106			$	40			$	(3,180	)		$	(2,046	)	$	(5,080	)

⁽¹⁾  Relates to foreign currency cash flow hedges that were reclassified from AOCI to Sales.

⁽²⁾  Represents net realized (gains) losses on the sales of available-for-sale investments that were reclassified from AOCI to Other (income) expense, net.

⁽³⁾  Includes net amortization of prior service cost and actuarial gains and losses included in net periodic benefit cost (see Note 10).

15. Segment Reporting

The Company’s operations are principally managed on a products basis and include the Pharmaceutical, Animal Health, Healthcare Services and Alliances operating segments. The Animal Health, Healthcare Services and Alliances segments are not material for separate reporting.

The Pharmaceutical segment includes human health pharmaceutical and vaccine products. Human health pharmaceutical products consist of therapeutic and preventive agents, generally sold by prescription, for the treatment of human disorders. The Company sells these human health pharmaceutical products primarily to drug wholesalers and retailers, hospitals, government agencies and managed health care providers such as health maintenance organizations, pharmacy benefit managers and other institutions. Vaccine products consist of preventive pediatric, adolescent and adult vaccines, primarily administered at physician offices. The Company sells these human health vaccines primarily to physicians, wholesalers, physician distributors and government entities. A large component of pediatric and adolescent vaccine sales are made to the U.S. Centers for Disease Control and Prevention Vaccines for Children program, which is funded by the U.S. government. Additionally, the Company sells vaccines to the Federal government for placement into vaccine stockpiles. Sales of vaccines in most major European markets were marketed through the Company’s SPMSD joint venture until its termination on December 31, 2016.

The Company also has animal health operations that discover, develop, manufacture and market animal health products, including vaccines, which the Company sells to veterinarians, distributors and animal producers. The Company’s Healthcare Services segment provides services and solutions that focus on engagement, health analytics and clinical services to improve the value of care delivered to patients.

- 23 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Sales of the Company’s products were as follows:

	Three Months Ended   March 31,
($ in millions)	2017		2016
Primary Care and Women’s Health
Cardiovascular
Zetia	$	334	$	612
Vytorin	241		277
Liptruzet	49		23
Adempas	84		33
Diabetes
Januvia	839		906
Janumet	496		506
General Medicine and Women’s Health
Implanon/Nexplanon	170		134
NuvaRing	160		175
Follistim AQ	81		94
Hospital and Specialty
Hepatitis
Zepatier	378		50
HIV
Isentress	305		340
Hospital Acute Care
Bridion	148		90
Noxafil	141		145
Invanz	136		114
Cancidas	121		133
Cubicin	96		292
Primaxin	62		73
Immunology
Remicade	229		349
Simponi	184		188
Oncology
Keytruda	584		249
Emend	133		126
Temodar	66		66
Diversified Brands
Respiratory
Singulair	186		237
Nasonex	139		229
Dulera	82		113
Other
Cozaar/Hyzaar	112		126
Arcoxia	103		111
Fosamax	61		75
Vaccines (1)
Gardasil/Gardasil 9	532		378
ProQuad/M-M-R II/Varivax	355		357
RotaTeq	224		188
Pneumovax 23	163		107
Zostavax	154		125
Other pharmaceutical (2)	1,037		1,083
Total Pharmaceutical segment sales	8,185		8,104
Other segment sales (3)	1,033		905
Total segment sales	9,218		9,009
Other (4)	216		303
	$	9,434	$	9,312

⁽¹⁾  On December 31, 2016, Merck and Sanofi Pasteur terminated their equally-owned joint venture, SPMSD, which marketed vaccines in most major European markets. Accordingly, vaccine sales in 2017 include sales in the European markets that were previously part of SPMSD. Amounts for 2016 do not include sales of vaccines sold through SPMSD, the results of which are reflected inequity income from affiliates which is included in Other (income) expense, net. Amounts for 2016 do, however, include supply sales to SPMSD.

⁽²⁾  Other pharmaceutical primarily reflects sales of other human health pharmaceutical products, including products within the franchises not listed separately.

⁽³⁾  Represents the non-reportable segments of Animal Health, Healthcare Services and Alliances.

⁽⁴⁾  Other is primarily comprised of miscellaneous corporate revenues, including revenue hedging activities, as well as third-party manufacturing sales. Other in the first quarter of 2017 and 2016 also includes $50 million and $75 million, respectively, related to the sale of the marketing rights to certain products.

- 24 -

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

A reconciliation of segment profits to Income before taxes is as follows:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Segment profits:
Pharmaceutical segment	$	5,180		$	5,117
Other segments	452			355
Total segment profits	5,632			5,472
Other profits	142			227
Unallocated:
Interest income	97			79
Interest expense	(182		)	(172		)
Equity income from affiliates	(12		)	20
Depreciation and amortization	(370		)	(428		)
Research and development	(1,599		)	(1,373		)
Amortization of purchase accounting adjustments	(778		)	(1,133		)
Restructuring costs	(151		)	(91		)
Other unallocated, net	(776		)	(977		)
	$	2,003		$	1,624

Segment profits are comprised of segment sales less standard costs and certain operating expenses directly incurred by the segments. For internal management reporting presented to the chief operating decision maker, Merck does not allocate materials and production costs, other than standard costs, the majority of research and development expenses or general and administrative expenses, nor the cost of financing these activities. Separate divisions maintain responsibility for monitoring and managing these costs, including depreciation related to fixed assets utilized by these divisions and, therefore, they are not included in segment profits. In addition, costs related to restructuring activities, as well as the amortization of purchase accounting adjustments are not allocated to segments.

Other profits are primarily comprised of miscellaneous corporate profits, as well as operating profits related to third-party manufacturing sales.

Other unallocated, net includes expenses from corporate and manufacturing cost centers, goodwill and intangible asset impairment charges, gains or losses on sales of businesses, expense or income related to changes in the estimated fair value of contingent consideration, and other miscellaneous income or expense items.

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

Operating Results

Sales

Worldwide sales were $9.4 billion for the first quarter of 2017, an increase of 1% compared with the first quarter of 2016. Foreign exchange unfavorably affected global sales performance by 2% in the first quarter of 2017. Sales growth was driven primarily by higher sales in the oncology franchise largely from Keytruda (pembrolizumab), the ongoing launch of hepatitis C virus (HCV) treatment Zepatier (elbasvir and grazoprevir), and growth in vaccine products including Gardasil (Human Papillomavirus Quadrivalent [Types 6, 11, 16 and 18] Vaccine, Recombinant)/Gardasil 9 (Human Papillomavirus 9-valent Vaccine, Recombinant) and Pneumovax 23 (pneumococcal vaccine polyvalent). Sales in the first quarter of 2017 benefited from the December 31, 2016 termination of Sanofi Pasteur MSD (SPMSD), a joint venture between Merck and Sanofi Pasteur, which marketed vaccines in most major European markets. In the first quarter of 2017, Merck began recording vaccine sales in the markets that were previously part of the SPMSD joint venture. Also contributing to sales growth in the first quarter of 2017 were higher sales of Bridion (sugammadex) Injection, Adempas (riociguat), and Animal Health products, particularly Bravecto (fluralaner). Partially offsetting revenue growth in the first quarter of 2017 were declines attributable to the effects of generic and biosimilar competition for certain products including Zetia (ezetimibe), which lost U.S. market exclusivity in December 2016, as well as Cubicin (daptomycin for injection), Remicade (infliximab), as well as lower sales of products within Diversified Brands including Nasonex (mometasone furoate monohydrate) and Singulair (montelukast). Declines in the diabetes franchise of Januvia (sitagliptin) and Janumet (sitagliptin/metformin HCl) also offset revenue growth in the first quarter.

Global efforts toward health care cost containment continue to exert pressure on product pricing and market access worldwide. In the United States, health care reform is contributing to an increase in the number of patients in the Medicaid program under which sales of pharmaceutical products are subject to substantial rebates. In many international markets, government-mandated pricing actions have reduced prices of generic and patented drugs. In addition, other austerity measures negatively affected the Company’s revenue performance in the first quarter of 2017. The Company anticipates these pricing actions and other austerity measures will continue to negatively affect revenue performance for the remainder of 2017.

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Sales of the Company’s products were as follows:

	Three Months Ended   March 31,
($ in millions)	2017		2016
Primary Care and Women’s Health
Cardiovascular
Zetia	$	334	$	612
Vytorin	241		277
Liptruzet	49		23
Adempas	84		33
Diabetes
Januvia	839		906
Janumet	496		506
General Medicine and Women’s Health
Implanon/Nexplanon	170		134
NuvaRing	160		175
Follistim AQ	81		94
Hospital and Specialty
Hepatitis
Zepatier	378		50
HIV
Isentress	305		340
Hospital Acute Care
Bridion	148		90
Noxafil	141		145
Invanz	136		114
Cancidas	121		133
Cubicin	96		292
Primaxin	62		73
Immunology
Remicade	229		349
Simponi	184		188
Oncology
Keytruda	584		249
Emend	133		126
Temodar	66		66
Diversified Brands
Respiratory
Singulair	186		237
Nasonex	139		229
Dulera	82		113
Other
Cozaar/Hyzaar	112		126
Arcoxia	103		111
Fosamax	61		75
Vaccines (1)
Gardasil/Gardasil 9	532		378
ProQuad/M-M-R II/Varivax	355		357
RotaTeq	224		188
Pneumovax 23	163		107
Zostavax	154		125
Other pharmaceutical (2)	1,037		1,083
Total Pharmaceutical segment sales	8,185		8,104
Other segment sales (3)	1,033		905
Total segment sales	9,218		9,009
Other (4)	216		303
	$	9,434	$	9,312

⁽¹⁾  On December 31, 2016, Merck and Sanofi Pasteur terminated their equally-owned joint venture, SPMSD, which marketed vaccines in most major European markets. Accordingly, vaccine sales in 2017 include sales in the European markets that were previously part of SPMSD. Amounts for 2016 do not include sales of vaccines sold through SPMSD, the results of which are reflected in equity income from affiliates which is included in Other (income) expense, net. Amounts for 2016 do, however, include supply sales to SPMSD.

⁽²⁾  Other pharmaceutical primarily reflects sales of other human health pharmaceutical products, including products within the franchises not listed separately.

⁽³⁾  Represents the non-reportable segments of Animal Health, Healthcare Services and Alliances.

⁽⁴⁾  Other is primarily comprised of miscellaneous corporate revenues, including revenue hedging activities, as well as third-party manufacturing sales. Other in the first quarter of 2017 and 2016 also includes $50 million and $75 million, respectively, related to the sale of the marketing rights to certain products.

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Product sales are recorded net of the provision for discounts, which includes indirect customer discounts that occur when a contracted customer purchases directly through an intermediary wholesale purchaser, known as chargebacks, as well as indirectly in the form of rebates owed based upon definitive contractual agreements or legal requirements with private sector and public sector (Medicaid and Medicare Part D) benefit providers, after the final dispensing of the product by a pharmacy to a benefit plan participant. These discounts, in the aggregate, reduced U.S. sales by $2.5 billion and $2.1 billion for the three months ended March 31, 2017 and 2016, respectively. Inventory levels at key U.S. wholesalers for each of the Company’s major pharmaceutical products are generally less than one month.

Pharmaceutical Segment

Primary Care and Women’s Health

Cardiovascular

Combined global sales of Zetia (marketed in most countries outside the United States as Ezetrol), Vytorin (ezetimibe and simvastatin) (marketed outside the United States as Inegy), and Atozet (ezetimibe and atorvastatin) (marketed in certain countries outside of the United Sates), medicines for lowering LDL cholesterol, were $624 million in the first quarter of 2017, a decline of 32% compared with the first quarter of 2016 including a 1% unfavorable effect from foreign exchange. The sales decline primarily reflects lower volumes of Zetia in the United States from generic competition. By agreement, a generic manufacturer launched a generic version of Zetia in the United States in December 2016 and the Company is experiencing a rapid and substantial decline in U.S. Zetia sales. The Company anticipates the decline will accelerate in future periods. The U.S. patent and exclusivity periods for Zetia and Vytorin expired in April 2017 and the Company anticipates declines in U.S. Zetia and Vytorin sales. U.S. sales of Zetia and Vytorin were $111 million and $90 million, respectively, for the first quarter of 2017. The Company has market exclusivity in major European markets for Ezetrol until April 2018 and for Inegy until April 2019.

Pursuant to a collaboration with Bayer AG (Bayer), Merck acquired lead commercial rights for Adempas, a novel cardiovascular drug for the treatment of pulmonary arterial hypertension, in countries outside the Americas while Bayer has lead rights in the Americas, including the United States. In 2016, Merck began promoting and distributing Adempas in Europe. Transition from Bayer in other Merck territories will continue in 2017. Merck recorded sales of $84 million and $33 million for Adempas in the first quarter of 2017 and 2016, respectively, which includes sales in Merck’s marketing territories, as well as Merck’s share of profits from the sale of Adempas in Bayer’s marketing territories.

Diabetes

Worldwide combined sales of Januvia and Janumet, medicines that help lower blood sugar levels in adults with type 2 diabetes, were $1.3 billion in the first quarter of 2017, a decline of 5% compared with the first quarter of 2016. The decline primarily reflects lower sales in the United States driven by the timing of customer purchases, as well as pricing pressures that were partially offset by higher demand. Volume and pricing declines in Europe and pricing declines in Japan also contributed to the sales decrease. These declines were partially offset by volume growth in Asia Pacific and Canada and price and volume growth in Latin America.

In April 2017, Merck announced that the U.S. Food and Drug Administration (FDA) issued a Complete Response Letter (CRL) regarding Merck’s supplemental New Drug Applications for Januvia, Janumet and Janumet XR (sitagliptin and metformin HCl extended-release). With these applications, Merck is seeking to include data from TECOS (Trial Evaluating Cardiovascular Outcomes with Sitagliptin) in the prescribing information of sitagliptin-containing medicines. Merck is reviewing the letter and will discuss next steps with the FDA.

General Medicine and Women’s Health 

Worldwide sales of Implanon/Nexplanon (etonogestrel implant), single-rod subdermal contraceptive implants, grew 27% to $170 million in the first quarter of 2017 compared with the first quarter of 2016 primarily reflecting higher pricing, as well as volume growth in the United States. Foreign exchange unfavorably affected global sales performance by 1% for the first quarter of 2017.

Worldwide sales of NuvaRing (etonogestrel/ethinyl estradiol vaginal ring), a vaginal contraceptive product, were $160 million in the first quarter of 2017, a decrease of 9% compared with the first quarter of 2016, driven largely by lower sales in the United States reflecting the timing of customer purchases. In August 2016, the U.S. District Court ruled that the Company’s delivery system patent for NuvaRing is invalid. The Company is appealing this verdict to the U.S. Court of Appeals for the Federal Circuit. However, given the U.S. District Court’s decision, there may be generic entrants into the U.S. market in advance of the April 2018 patent expiration. If this should occur, the Company anticipates a significant decline in U.S. NuvaRing sales thereafter. U.S. sales of NuvaRing were $113 million for the first quarter of 2017. As a result of the unfavorable U.S. District Court decision, the Company evaluated the intangible asset related to NuvaRing for impairment and concluded that it was not impaired. The intangible asset value for NuvaRing was $274 million at March 31, 2017.

Global sales of Follistim AQ (follitropin beta injection) (marketed in most countries outside the United States as Puregon), a fertility treatment, were $81 million in the first quarter of 2017, a decline of 14% compared with the first quarter of

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2016 including a 1% unfavorable effect from foreign exchange. The sales decline reflects pricing pressures and lower volumes in the United States.

Hospital and Specialty

Hepatitis

Global sales of Zepatier were $378 million in the first quarter of 2017 compared with $50 million in the first quarter of 2016 driven by ongoing launches globally. In January 2016, the FDA approved Zepatier for the treatment of chronic hepatitis C virus (HCV) genotype (GT) 1 or GT4 infection in adults. Zepatier is recommended for use with ribavirin in certain patient populations. Zepatier became available in the United States in February 2016. Zepatier was approved by the European Commission (EC) in July 2016 and became available in European markets in late November 2016. Launches are expected to continue across the European Union (EU) in 2017. The Company is also launching Zepatier in Japan and in other international markets. Sales in the United States in the first quarter of 2017 reflect an approximately $40 million favorable adjustment to rebate accruals due to mix of business.

HIV

Global sales of Isentress (raltegravir), an HIV integrase inhibitor for use in combination with other antiretroviral agents for the treatment of HIV-1 infection, were $305 million in the first quarter of 2017, a decline of 10% compared with the first quarter of 2016. The decline reflects lower demand in the United States and Europe due to competitive pressures, as well as lower volumes in Brazil.

Hospital Acute Care

Worldwide sales of Bridion, for the reversal of two types of neuromuscular blocking agents used during surgery, were $148 million in the first quarter of 2017, an increase of 63% compared with the first quarter of 2016 including a 1% unfavorable effect from foreign exchange. Sales growth reflects volume growth in most markets, particularly in the United States.

Worldwide sales of Noxafil (posaconazole), for the prevention of invasive fungal infections, were $141 million in the first quarter of 2017, a decline of 3% compared with the first quarter of 2016 reflecting a 3% unfavorable effect from foreign exchange.

Global sales of Invanz (ertapenem sodium), for the treatment of certain infections, were $136 million in the first quarter of 2017, an increase of 20% compared with the first quarter of 2016 including a 1% favorable effect from foreign exchange. Sales growth primarily reflects higher pricing in the United States and price and volume growth in Latin America. The Company will lose U.S. patent protection for Invanz in November 2017 and the Company anticipates a significant decline in U.S. Invanz sales thereafter. U.S. sales of Invanz were $82 million in the first quarter of 2017.

Global sales of Cancidas (caspofungin acetate), an anti-fungal product, were $121 million in the first quarter of 2017, a decline of 9% compared with the first quarter of 2016 including a 3% unfavorable effect from foreign exchange. The decline was driven primarily by lower sales in certain emerging markets, as well as lower pricing in Europe. The EU compound patent for Cancidas expired in April 2017 and the Company anticipates a decline in Cancidas sales in those European markets thereafter. Sales of Cancidas in these European markets were $68 million in the first quarter of 2017.

Sales of Cubicin, an I.V. antibiotic for complicated skin and skin structure infections or bacteremia when caused by designated susceptible organisms, were $96 million in the first quarter of 2017, a decline of 67% compared with the first quarter of 2016. The U.S. composition patent for Cubicin expired in June 2016. Accordingly, the Company is experiencing a rapid and substantial decline in U.S. Cubicin sales and expects the decline to continue. The Company anticipates it will lose market exclusivity for Cubicin in Europe in mid-2017.

In October 2016, Merck announced that the FDA approved Zinplava Injection 25 mg/mL. Zinplava is indicated to reduce recurrence of Clostridium difficile infection (CDI) in patients 18 years of age or older who are receiving antibacterial drug treatment of CDI and are at high risk for CDI recurrence. Zinplava became available in the United States in February 2017. Zinplava was approved by the EC in January 2017 and became available in the EU in March 2017.

Immunology

Sales of Remicade, a treatment for inflammatory diseases (marketed by the Company in Europe, Russia and Turkey), were $229 million in the first quarter of 2017, a decline of 34% compared with the first quarter of 2016. Foreign exchange unfavorably affected sales performance by 3% in the first quarter of 2017. The Company lost market exclusivity for Remicade in major European markets in 2015 and no longer has market exclusivity in any of its marketing territories. The Company is experiencing pricing and volume declines in these markets as a result of biosimilar competition and expects the declines to continue.

Sales of Simponi (golimumab), a once-monthly subcutaneous treatment for certain inflammatory diseases (marketed by the Company in Europe, Russia and Turkey), were $184 million in the first quarter of 2017, a decline of 2% compared with

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the first quarter of 2016 including a 4% unfavorable effect from foreign exchange. Excluding the unfavorable effect of foreign exchange, sales performance was driven primarily by higher volumes.

Oncology

Global sales of Keytruda, an anti-PD-1 (programmed death receptor-1) therapy, were $584 million in the first quarter of 2017 compared with $249 million in the first quarter of 2016 driven by volume growth in all markets, particularly in the United States, as the Company continues to launch Keytruda with new indications.

In October 2016, Merck announced that the FDA approved Keytruda for the first-line treatment of patients with non-small-cell lung cancer (NSCLC) whose tumors have high PD-L1 expression (tumor proportion score [TPS] of 50% or more) as determined by an FDA-approved test, with no EGFR or ALK genomic tumor aberrations. With this new indication, Keytruda is now the only anti-PD-1 therapy to be approved in the first-line treatment setting for these patients. In addition, the FDA approved a labeling update to include data from KEYNOTE-010 in the second-line or greater treatment setting for patients with metastatic NSCLC whose tumors express PD-L1 (TPS of 1% or more) as determined by an FDA-approved test, with disease progression on or after platinum-containing chemotherapy. Patients with EGFR or ALK genomic tumor aberrations should have disease progression on FDA-approved therapy for these aberrations prior to receiving Keytruda. In December 2016, Keytruda was approved in Japan for the treatment of certain patients with PD-L1-positive unresectable advanced/recurrent NSCLC in the first- and second-line treatment settings. Additionally, in January 2017, the EC approved Keytruda for the first-line treatment of metastatic NSCLC in adults whose tumors have high PD-L1 expression (TPS of 50% or more) with no EGFR or ALK positive tumor mutations.

In August 2016, Merck announced that the FDA approved Keytruda for the treatment of patients with recurrent or metastatic head and neck squamous cell carcinoma (HNSCC) with disease progression on or after platinum-containing chemotherapy.

In March 2017, the FDA approved Keytruda for the treatment of adult and pediatric patients with classical Hodgkin lymphoma (cHL) refractory to treatment, or who have relapsed after three or more prior lines of therapy.Also in May 2017, the EC approved Keytruda for the treatment of adult patients with relapsed or refractory cHL who have failed autologous stem cell transplant and brentuximab vedotin, or who are transplant-ineligible and have failed brentuximab vedotin.

Keytruda is now approved in the United States and in the EU for the treatment of previously untreated metastatic NSCLC in patients whose tumors express high levels of PD-L1 and previously treated metastatic NSCLC in patients whose tumors express PD-L1, as well as for the treatment of melanoma and previously treated cHL. Keytruda is also approved in the United States for previously treated recurrent or metastatic HNSCC.

Merck has four sBLAs under Priority Review with the FDA for Keytruda including: for use in combination with carboplatin and pemetrexed for the first-line treatment of patients with metastatic or advanced non-squamous NSCLC regardless of PD-L1 expression; for the treatment of previously treated patients with advanced microsatellite instability-high (MSI-H) cancer; for the first-line treatment of cisplatin-ineligible patients with locally advanced or metastatic urothelial cancer, including most bladder cancers; and for the second-line treatment of patients with locally advanced or metastatic urothelial cancer with disease progression on or after platinum-containing chemotherapy. The Company plans additional regulatory filings in the United States and other countries. The Keytruda clinical development program includes studies across a broad range of cancer types (see “Research and Development” below). Pursuant to the settlement of worldwide patent infringement litigation related to Keytruda (see Note 7 to the condensed consolidated financial statements), the Company will pay royalties of 6.5% on net sales of Keytruda in 2017 through 2023; and 2.5% on net sales of Keytruda in 2024 through 2026.

Global sales of Emend (aprepitant), for the prevention of chemotherapy-induced and post-operative nausea and vomiting, were $133 million in the first quarter of 2017, an increase of 6% compared with the first quarter of 2016, driven primarily by volume growth in Japan and higher pricing in the United States, partially offset by volume declines in Europe.

Diversified Brands

Merck’s diversified brands include human health pharmaceutical products that are approaching the expiration of their marketing exclusivity or are no longer protected by patents in developed markets, but continue to be a core part of the Company’s offering in other markets around the world.

Respiratory

Worldwide sales of Singulair, a once-a-day oral medicine for the chronic treatment of asthma and for the relief of symptoms of allergic rhinitis, were $186 million in the first quarter of 2017, a decline of 22% compared with the first quarter of 2016 including a 1% unfavorable effect from foreign exchange. The sales decline was largely driven by lower volumes in Japan. The patents that provided market exclusivity for Singulair in Japan expired in February and October of 2016. As a result, the Company is experiencing a significant and rapid decline in Singulair sales in Japan and expects the decline to continue. The Company no longer has market exclusivity for Singulair in any major market.

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Global sales of Nasonex, an inhaled nasal corticosteroid for the treatment of nasal allergy symptoms, declined 40% to $139 million in the first quarter of 2017 compared with the first quarter of 2016. Foreign exchange favorably affected global sales performance by 1% in the first quarter of 2017. The sales decline was driven by lower volumes in the United States from ongoing generic competition.

Global sales of Dulera Inhalation Aerosol (mometasone furoate/formoterol fumarate dihydrate), a combination medicine for the treatment of asthma, were $82 million in the first quarter of 2017, a decline of 27% compared with the first quarter of 2016, driven by lower sales in the United States reflecting competitive pricing pressures.

Other

Global sales of Cozaar (losartan potassium) and its companion agent Hyzaar (losartan potassium and hydrochlorothiazide) (a combination of Cozaar and hydrochlorothiazide), treatments for hypertension, were $112 million in the first quarter of 2017 a decline of 11% compared with the first quarter of 2016. Foreign exchange unfavorably affected global sales performance by 2% in the first quarter of 2017. The patents that provided market exclusivity for Cozaar and Hyzaar in the United States and in most major international markets have expired. Accordingly, the Company is experiencing declines in Cozaar and Hyzaar sales and expects the declines to continue.

Vaccines

On December 31, 2016, Merck and Sanofi Pasteur S.A. terminated their equally-owned joint venture, SPMSD, which developed and marketed vaccines in Europe. Accordingly, vaccine sales in 2017 include sales of Merck vaccines in the European markets that were previously part of the SPMSD joint venture, whereas sales in periods prior to 2017 do not. Prior to 2017, vaccine sales in these European markets were sold through the SPMSD joint venture, the results of which are reflected in equity income from affiliates included in Other (income) expense, net (see Note 11 to the condensed consolidated financial statements). Supply sales to SPMSD, however, are included in vaccine sales in periods prior to 2017. Incremental vaccine sales in the first quarter of 2017 resulting from the termination of the SPMSD joint venture were approximately $65 million, of which approximately $50 million relate to Gardasil/Gardasil 9.

Merck’s sales of Gardasil/Gardasil 9, vaccines to help prevent certain cancers and diseases caused by certain types of human papillomavirus (HPV), were $532 million in the first quarter of 2017, an increase of 41% compared with the first quarter of 2016. Sales growth was driven primarily by higher sales in the United States, largely reflecting the timing of public sector purchases, demand and pricing, as well as higher sales in Europe resulting from the termination of the SPMSD joint venture as noted above, and higher demand in the Asia Pacific region. In October 2016, the FDA approved a 2-dose vaccination regimen for Gardasil 9, for use in girls and boys 9 through 14 years of age, and the U.S. Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices voted to recommend the 2-dose vaccination regimen for certain 9 through 14 year olds. The Company anticipates the transition from a 3-dose vaccine regimen to a 2-dose vaccination regimen will have an unfavorable effect on sales of Gardasil 9 during the period of transition.

Merck’s sales of ProQuad (Measles, Mumps, Rubella and Varicella Virus Vaccine Live), a pediatric combination vaccine to help protect against measles, mumps, rubella and varicella, were $103 million in the first quarter of 2017 compared with $122 million in the first quarter of 2016 driven primarily by the effects of public sector purchasing in the United States. Merck’s sales of M‑M‑R II (Measles, Mumps and Rubella Virus Vaccine Live), a vaccine to help protect against measles, mumps and rubella, were $92 million for the first quarter of 2017 compared with $76 million for the first quarter of 2016 driven primarily by higher sales in Europe resulting from the termination of the SPMSD joint venture and volume growth in certain emerging markets, particularly in Turkey. Merck’s sales of Varivax (Varicella Virus Vaccine Live), a vaccine to help prevent chickenpox (varicella), were $159 million for the first quarter of 2017 compared with $158 million for the first quarter of 2016.

Merck’s sales of RotaTeq (Rotavirus Vaccine, Live Oral, Pentavalent), a vaccine to help protect against rotavirus gastroenteritis in infants and children, were $224 million in the first quarter of 2017, an increase of 19% compared with the first quarter of 2016, primarily reflecting the timing of public sector purchases in the United States, as well as higher sales in Europe resulting from the termination of the SPMSD joint venture.

Merck’s sales of Pneumovax 23, a vaccine to help prevent pneumococcal disease, were $163 million in the first quarter of 2017, an increase of 52% compared with the first quarter of 2016. Sales growth was driven primarily by higher demand in the United States, as well as in Japan.

Merck’s sales of Zostavax (Zoster Vaccine Live), a vaccine to help prevent shingles (herpes zoster) in adults 50 years of age and older, were $154 million in the first quarter of 2017, an increase of 23% compared with the first quarter of 2016 including a 1% favorable effect from foreign exchange. Sales growth was driven largely by volume growth in the Asia Pacific region.

Other Segments

The Company’s other segments are the Animal Health, Healthcare Services and Alliances segments, which are not material for separate reporting.

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Animal Health

Animal Health includes pharmaceutical and vaccine products for the prevention, treatment and control of disease in all major farm and companion animal species. Animal Health sales are affected by competition and the frequent introduction of generic products. Global sales of Animal Health products totaled $939 million for the first quarter of 2017, an increase of 13% compared with sales of $829 million in the first quarter of 2016. Foreign exchange unfavorably affected global sales performance by 1% in the first quarter of 2017. Sales growth primarily reflects higher sales of companion animal products, driven by the Bravecto line of products that kill fleas and ticks in dogs and cats for up to 12 weeks, as well as ruminant, poultry and swine products.

In March 2017, Merck acquired a controlling interest in Vallée, a leading privately held producer of animal health products in Brazil (see Note 2 to the condensed consolidated financial statements).

Costs, Expenses and Other

Materials and Production

Materials and production costs were $3.0 billion for the first quarter of 2017, a decline of 16% compared with the same period of 2016. Costs in the first quarter of 2017 and 2016 include $773 million and $1.1 billion, respectively, of expenses for the amortization of intangible assets recorded in connection with business acquisitions. Additionally, costs in the first quarter of 2017 include a $76 million intangible asset impairment charge related to a licensing agreement. Costs for the first quarter of 2016 also include an intangible asset impairment charge of $252 million related to a marketed product (see Note 6 to the condensed consolidated financial statements). The Company may recognize additional non-cash impairment charges in the future related to intangible assets that were measured at fair value and capitalized in connection with business acquisitions and such charges could be material. Included in materials and production costs are expenses associated with restructuring activities which amounted to $63 million and $47 million in the first quarter of 2017 and 2016, respectively, including accelerated depreciation and asset write-offs related to the planned sale or closure of manufacturing facilities. Separation costs associated with manufacturing-related headcount reductions have been incurred and are reflected in Restructuring costs as discussed below.

Gross margin was 68.0% in the first quarter of 2017 compared with 61.6% in the first quarter of 2016. The improvement in gross margin was driven primarily by a lower net impact from the amortization of intangible assets, as well as intangible asset impairment and restructuring charges as noted above, which reduced gross margin by 9.8 percentage points in the first quarter of 2017 as compared with 15.4 percentage points in the first quarter of 2016. The gross margin improvement also reflects the favorable effects of foreign exchange and lower inventory write-offs.

Marketing and Administrative

Marketing and administrative expenses increased 4% to $2.4 billion in the first quarter of 2017 compared with the first quarter of 2016. The increase was driven primarily by higher health care reform fee expenses, administrative costs, promotion and direct selling expenses, and acquisition and divestiture-related costs.

Research and Development

Research and development (R&D) expenses were $1.8 billion for the first quarter of 2017, an increase of 8% compared with the first quarter of 2016. The increase primarily reflects higher clinical development spending, partially offset by lower restructuring costs.

R&D expenses are comprised of the costs directly incurred by Merck Research Laboratories (MRL), the Company’s research and development division that focuses on human health-related activities, which were approximately $1.1 billion and $980 million in the first quarter of 2017 and 2016, respectively. Also included in R&D expenses are costs incurred by other divisions in support of R&D activities, including depreciation, production and general and administrative, as well as licensing activity, and certain costs from operating segments, including the Pharmaceutical and Animal Health segments, which in the aggregate were approximately $665 million and $590 million for the first quarter of 2017 and 2016, respectively. In addition, R&D expenses include in-process research and development (IPR&D) impairment charges of $25 million for the first quarter of 2016 (see Note 6 to the condensed consolidated financial statements). The Company may recognize additional non-cash impairment charges in the future related to the cancellation or delay of other pipeline programs that were measured at fair value and capitalized in connection with business acquisitions and such charges could be material. R&D expenses also reflect accelerated depreciation and asset abandonment costs associated with restructuring activities of $55 million in the first quarter of 2016 (see Note 3 to the condensed consolidated financial statements).

Restructuring Costs

The Company incurs substantial costs for restructuring program activities related to Merck’s productivity and cost reduction initiatives, as well as in connection with the integration of certain acquired businesses. In 2010 and 2013, the Company commenced actions under global restructuring programs designed to streamline its cost structure. The actions under these programs include the elimination of positions in sales, administrative and headquarters organizations, as well as the sale or closure of certain

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manufacturing and research and development sites and the consolidation of office facilities. The Company also continues to reduce its global real estate footprint and improve the efficiency of its manufacturing and supply network. The non-facility related restructuring actions under these programs are substantially complete; the remaining activities primarily relate to ongoing facility rationalizations.

Restructuring costs, primarily representing separation and other related costs associated with these restructuring activities, were $151 million and $91 million for the first quarter of 2017 and 2016, respectively. Separation costs were incurred associated with actual headcount reductions, as well as estimated expenses under existing severance programs for headcount reductions that were probable and could be reasonably estimated. Merck eliminated approximately 545 positions and 470 positions in the first quarter of 2017 and 2016, respectively, related to these restructuring activities. Also included in restructuring costs are asset abandonment, shut-down and other related costs, as well as employee-related costs such as curtailment, settlement and termination charges associated with pension and other postretirement benefit plans and share-based compensation plan costs. For segment reporting, restructuring costs are unallocated expenses.

Additional costs associated with the Company’s restructuring activities are included in Materials and production, Marketing and administrative and Research and development as discussed above. The Company recorded aggregate pretax costs of $215 million and $196 million in the first quarter of 2017 and 2016, respectively, related to restructuring program activities (see Note 3 to the condensed consolidated financial statements). The Company expects to substantially complete the remaining actions under the programs by the end of 2017 and incur approximately $500 million of additional pretax costs.

Other (Income) Expense, Net

Other (income) expense, net was $58 million of expense in the first quarter of 2017 compared with $48 million of expense in the first quarter of 2016. For details on the components of Other (income) expense, net, see Note 11 to the condensed consolidated financial statements.

Segment Profits
	Three Months Ended   March 31,
($ in millions)	2017			2016
Pharmaceutical segment profits	$	5,180		$	5,117
Other non-reportable segment profits	452			355
Other	(3,629		)	(3,848		)
Income before income taxes	$	2,003		$	1,624

Segment profits are comprised of segment sales less standard costs, certain operating expenses directly incurred by the segment, components of equity income or loss from affiliates and certain depreciation and amortization expenses. For internal management reporting presented to the chief operating decision maker, Merck does not allocate materials and production costs, other than standard costs, the majority of research and development expenses or general and administrative expenses, nor the cost of financing these activities. Separate divisions maintain responsibility for monitoring and managing these costs, including depreciation related to fixed assets utilized by these divisions and, therefore, they are not included in segment profits. Also excluded from the determination of segment profits are acquisition and divestiture-related costs, including the amortization of purchase accounting adjustments, intangible asset impairment charges and changes in the estimated fair value of liabilities related to contingent consideration, restructuring costs, and a portion of equity income. Additionally, segment profits do not reflect other expenses from corporate and manufacturing cost centers and other miscellaneous income or expense. These unallocated items are reflected in “Other” in the above table. Also included in “Other” are miscellaneous corporate profits (losses), as well as operating profits (losses) related to third-party manufacturing sales.

Pharmaceutical segment profits grew 1% in the first quarter of 2017 compared with the first quarter of 2016 primarily reflecting higher sales and the favorable effects of product mix.

Taxes on Income

The effective income tax rates of 22.3% and 30.4% for the first quarter of 2017 and 2016, respectively, reflect the impacts of acquisition and divestiture-related costs and restructuring costs, partially offset by the beneficial impact of foreign earnings.

The Company is under examination by numerous tax authorities in various jurisdictions globally. The ultimate finalization of the Company’s examinations with relevant taxing authorities can include formal administrative and legal proceedings, which could have a significant impact on the timing of the reversal of unrecognized tax benefits. The Company believes that its reserves for uncertain tax positions are adequate to cover existing risks or exposures. However, there is one item that is currently under discussion with the Internal Revenue Service relating to the 2006 through 2008 examination. The Company

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has concluded that its position should be sustained upon audit. However, if this item were to result in an unfavorable outcome or settlement, it could have a material adverse impact on the Company’s financial position, liquidity and results of operations.

Net Income and Earnings per Common Share

Net income attributable to Merck & Co., Inc. was $1.6 billion for the first quarter of 2017 compared with $1.1 billion for the first quarter of 2016. Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders (EPS) for the first quarter of 2017 were $0.56 compared with $0.40 in the first quarter of 2016.

Non-GAAP Income and Non-GAAP EPS

Non-GAAP income and non-GAAP EPS are alternative views of the Company’s performance that Merck is providing because management believes this information enhances investors’ understanding of the Company’s results as it permits investors to understand how management assesses performance. Non-GAAP income and non-GAAP EPS exclude certain items because of the nature of these items and the impact that they have on the analysis of underlying business performance and trends. The excluded items (which should not be considered non-recurring) consist of acquisition and divestiture-related costs, restructuring costs and certain other items. These excluded items are significant components in understanding and assessing financial performance. Non-GAAP income and non-GAAP EPS are important internal measures for the Company. Senior management receives a monthly analysis of operating results that includes non-GAAP EPS. Management uses these measures internally for planning and forecasting purposes and to measure the performance of the Company along with other metrics. Senior management’s annual compensation is derived in part using non-GAAP income and non-GAAP EPS. Since non-GAAP income and non-GAAP EPS are not measures determined in accordance with GAAP, they have no standardized meaning prescribed by GAAP and, therefore, may not be comparable to the calculation of similar measures of other companies. The information on non-GAAP income and non-GAAP EPS should be considered in addition to, but not as a substitute for or superior to, net income and EPS prepared in accordance with generally accepted accounting principles in the United States (GAAP).

A reconciliation between GAAP financial measures and non-GAAP financial measures is as follows:

	Three Months Ended   March 31,
($ in millions except per share amounts)	2017			2016
Pretax income as reported under GAAP	$	2,003		$	1,624
Increase (decrease) for excluded items:
Acquisition and divestiture-related costs	883			1,423
Restructuring costs	215			196
Other	(9		)	—
	3,092			3,243
Taxes on income as reported under GAAP	447			494
Estimated tax benefit on excluded items (1)	203			252
	650			746
Non-GAAP net income	2,442			2,497
Less: Net income attributable to noncontrolling interests	5			5
Non-GAAP net income attributable to Merck & Co., Inc.	$	2,437		$	2,492
EPS assuming dilution as reported under GAAP	$	0.56		$	0.40
EPS difference (2)	0.32			0.49
Non-GAAP EPS assuming dilution	$	0.88		$	0.89

⁽¹⁾  The estimated tax impact on the excluded items is determined by applying the statutory rate of the originating territory of the non-GAAP adjustments.

⁽²⁾  Represents the difference between calculated GAAP EPS and calculated non-GAAP EPS, which may be different than the amount calculated by dividing the impact of the excluded items by the weighted-average shares for the applicable period.

Acquisition and Divestiture-Related Costs

Non-GAAP income and non-GAAP EPS exclude the impact of certain amounts recorded in connection with business acquisitions and divestitures. These amounts include the amortization of intangible assets and amortization of purchase accounting adjustments to inventories, as well as intangible asset impairment charges and expense or income related to changes in the estimated fair value measurement of contingent consideration. Also excluded are integration, transaction, and certain other costs associated with business acquisitions, including severance costs which are not part of the Company’s formal restructuring programs, as well as transaction and certain other costs associated with divestitures of businesses.

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Restructuring Costs

Non-GAAP income and non-GAAP EPS exclude costs related to restructuring actions (see Note 3 to the condensed consolidated financial statements). These amounts include employee separation costs and accelerated depreciation associated with facilities to be closed or divested. Accelerated depreciation costs represent the difference between the depreciation expense to be recognized over the revised useful life of the asset, based upon the anticipated date the site will be closed or divested or the equipment disposed of, and depreciation expense as determined utilizing the useful life prior to the restructuring actions. Restructuring costs also include asset abandonment, shut-down and other related costs, as well as employee-related costs such as curtailment, settlement and termination charges associated with pension and other postretirement benefit plans and share-based compensation costs.

Certain Other Items

Non-GAAP income and non-GAAP EPS exclude certain other items. These items are adjusted for after evaluating them on an individual basis, considering their quantitative and qualitative aspects, and typically consist of items that are unusual in nature, significant to the results of a particular period or not indicative of future operating results.

Research and Development Update

Keytruda is an FDA-approved anti-PD-1 therapy in clinical development for expanded indications in different cancer types. Keytruda is currently approved for the treatment of certain patients with NSCLC, melanoma, cHL, and HNSCC (see “Pharmaceutical Segment” above).

In March 2017, Merck announced that the FDA extended the action date for the sBLA for Keytruda for the treatment of previously treated patients with advanced MSI-H cancer that it accepted for review in November 2016. The Company recently submitted additional data and analyses to the FDA related to the pending application. The submission of additional data is considered a major amendment to the sBLA under the Prescription Drug User Fee Act (PDUFA), thus extending the target action date by three months. The FDA target action date is now June 9, 2017. The sBLA is being reviewed under the FDA’s Accelerated Approval program. The FDA recently granted Breakthrough Therapy designation to Keytruda for unresectable or metastatic MSI-H non-colorectal cancer, and previously granted it for the treatment of patients with unresectable or metastatic MSI-H colorectal cancer.

In February 2017, the FDA accepted for review two sBLAs for Keytruda in patients with locally advanced or metastatic urothelial cancer, including most bladder cancers. The application for first-line use was granted Priority Review for the treatment of these patients who are ineligible for cisplatin-containing therapy. The application for second-line use was granted Priority Review for these patients with disease progression on or after platinum-containing chemotherapy. The PDUFA action date for both applications is June 14, 2017. The FDA previously granted Breakthrough Therapy designation to Keytruda for the second-line treatment of patients with locally advanced or metastatic urothelial cancer with disease progression on or after platinum-containing chemotherapy. Filings for these indications are also under review in the EU.

In January 2017, the FDA accepted for review an sBLA for Keytruda plus carboplatin and pemetrexed for the first-line treatment of patients with metastatic or advanced non-squamous NSCLC regardless of PD-L1 expression. This is the first application for regulatory approval of Keytruda in combination with another treatment. The FDA granted Priority Review with a PDUFA action date of May 10, 2017. The sBLA is being reviewed under the FDA’s Accelerated Approval program. This combination is also under review in the EU.

Additionally, Keytruda has also received Breakthrough Therapy designation from the FDA for the treatment of patients with primary mediastinal B-cell lymphoma that is refractory to or has relapsed after two prior lines of therapy.

The FDA’s Breakthrough Therapy designation is intended to expedite the development and review of a candidate that is planned for use, alone or in combination, to treat a serious or life-threatening disease or condition when preliminary clinical evidence indicates that the drug may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints.

The Keytruda clinical development program consists of nearly 500 clinical trials, including more than 250 trials that combine Keytruda with other cancer treatments. These studies encompass more than 30 cancer types including: bladder, colorectal, esophageal, gastric, head and neck, hepatocellular, Hodgkin lymphoma, non-Hodgkin lymphoma, melanoma, multiple myeloma, nasopharyngeal, NSCLC, ovarian, prostate, renal, small-cell lung cancer and triple-negative breast, many of which are currently in Phase 3 clinical development. Further trials are being planned for other cancers.

In March 2017, Merck and Pfizer Inc. (Pfizer) announced that the FDA accepted for review three New Drug Applications (NDAs) for medicines containing ertugliflozin, an investigational SGLT2 inhibitor in development to help improve glycemic control in adults with type 2 diabetes: one for monotherapy, one for the fixed-dose combination of ertugliflozin and Januvia, and one for the fixed-dose combination of ertugliflozin and metformin. The PDUFA action date for the three NDAs is in December 2017. Additionally, the European Medicines Agency has validated for review three Marketing Authorization Applications for ertugliflozin monotherapy and the two fixed-dose combination products. Under the terms of the collaboration agreement with

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Pfizer, Merck made a $90 million milestone payment to Pfizer in the first quarter of 2017 recorded in Research and development expenses.

On March 31, 2017, Merck received a CRL from the FDA for MK-1293, an investigational follow-on biologic insulin glargine candidate for the treatment of people with type 1 and type 2 diabetes, which is being developed in collaboration with and partially funded by Samsung Bioepis. The CRL was issued as a result of Sanofi listing a new patent in the FDA’s Orange Book for Lantus, the originator insulin glargine, on March 31, which was the FDA’s PDUFA action date for MK-1293. Merck is reviewing the letter and discussing next steps with the FDA to address the patent certification required to secure tentative approval of the product. In September 2016, Sanofi initiated a lawsuit which, under the Hatch-Waxman Act, automatically invoked a stay on final FDA approval of MK-1293 for a period of up to 30 months, or in the event a court finds in favor of Merck, whichever comes sooner.

The chart below reflects the Company’s research pipeline as of May 5, 2017. Candidates shown in Phase 3 include specific products and the date such candidate entered into Phase 3 development. Candidates shown in Phase 2 include the most advanced compound with a specific mechanism or, if listed compounds have the same mechanism, they are each currently intended for commercialization in a given therapeutic area. Small molecules and biologics are given MK-number designations and vaccine candidates are given V-number designations. Except as otherwise noted, candidates in Phase 1, additional indications in the same therapeutic area (other than with respect to Keytruda) and additional claims, line extensions or formulations for in-line products are not shown.

Phase 2	Phase 3 (Phase 3 entry date)	Under Review
Asthma MK-1029 Cancer MK-3475 Keytruda Advanced Solid Tumors Nasopharyngeal Ovarian PMBCL (Primary Mediastinal Large B-Cell Lymphoma) Prostate MK-2206 Cough, including cough with IPF MK-7264 Diabetes Mellitus MK-8521 Hepatitis C MK-3682B (MK-3682 (uprifosbuvir)/MK-5172 (grazoprevir)/MK-8408 (ruzasvir)) MK-3682C (MK-3682 (uprifosbuvir)/MK-8408 (ruzasvir) Pneumoconjugate Vaccine V114 Schizophrenia MK-8189	Alzheimer’s Disease MK-8931 (verubecestat) (December 2013) Atherosclerosis MK-0859 (anacetrapib) (May 2008) Bacterial Infection MK-7655A (relebactam+imipenem/cilastatin)  (October 2015) Cancer MK-3475 Keytruda Breast (October 2015) Colorectal (November 2015) Esophageal (December 2015) Gastric (May 2015) Head and Neck (November 2014) (EU) Hepatocellular (May 2016) Multiple Myeloma (December 2015) Renal (October 2016) Small-Cell Lung (May 2017) CMV Prophylaxis in Transplant Patients MK-8228 (letermovir) (June 2014) Diabetes Mellitus MK-0431J (sitagliptin+ipragliflozin)  (October 2015) (Japan)(1) Ebola Vaccine V920 (March 2015) Heart Failure MK-1242 (vericiguat) (September 2016)(1) Herpes Zoster V212 (inactivated VZV vaccine) (December 2010) HIV MK-1439 (doravirine) (December 2014)	New Molecular Entities/Vaccines Diabetes Mellitus MK-1293 (U.S.)(1)(2) MK-8835 (ertugliflozin) (U.S./EU)(1) MK-8835A (ertugliflozin+sitagliptin) (U.S./EU)(1) MK-8835B (ertugliflozin+metformin) (U.S./EU)(1) Pediatric Hexavalent Combination Vaccine V419 (U.S.)(3) Certain Supplemental Filings Cancer Keytruda • Previously Treated Microsatellite Instability-High (U.S.) • Combination with carboplatin and pemetrexed in first-line non-squamous Non-Small-Cell Lung (U.S./EU) • First Line Cis-ineligible Bladder (U.S./EU) • Second Line Metastatic Bladder (U.S./EU)
		Footnotes: (1)Being developed in a collaboration. (2)  On March 31, 2017, Merck received a CRL from the FDA for MK-1293; subject to an automatic 30 day stay. (3)  V419 is an investigational pediatric hexavalent combination vaccine, DTaP5-IPV-Hib-HepB, that is being developed and, if approved, will be commercialized through a partnership of Merck and Sanofi Pasteur. In November 2015, the FDA issued a CRL with respect to V419. Both companies are reviewing the CRL and plan to have further communication with the FDA.

Selected Joint Venture and Affiliate Information

Sanofi Pasteur MSD

On December 31, 2016, Merck and Sanofi Pasteur terminated their equally-owned joint venture, SPMSD, which developed and marketed vaccines in Europe. Total vaccine sales reported by SPMSD were $182 million in the first quarter of 2016, which included $41 million sales of Gardasil/Gardasil 9. The Company recorded the results from its interest in SPMSD in Other (income) expense, net (see Note 11 to the condensed consolidated financial statements).

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Liquidity and Capital Resources

($ in millions)	March 31, 2017			December 31, 2016
Cash and investments	$	27,145		$	25,757
Working capital	11,707			13,410
Total debt to total liabilities and equity	29.5		%	26.0		%

Cash provided by operating activities was $286 million in the first three months of 2017 compared with $2.2 billion in the first three months of 2016. The decrease in cash provided by operating activities reflects a $625 million payment made by the Company in the first quarter of 2017 related to the settlement of worldwide Keytruda patent litigation (see Note 7 to the condensed consolidated financial statements), as well as a tax refund and the receipt of insurance proceeds in the first quarter 2016. Cash provided by operating activities continues to be the Company’s primary source of funds to finance operating needs, capital expenditures, a portion of treasury stock purchases and dividends paid to shareholders.

Cash provided by investing activities was $3.2 billion in the first three months of 2017 compared with $1.7 billion in the first three months of 2016. The increase in cash provided by investing activities in 2017 was driven primarily by higher proceeds from the sales of securities and other investments, partially offset by higher purchases of securities and other investments, the use of cash to fund the acquisition of Vallée and higher capital expenditures.

Cash provided by financing activities was $1.5 billion in the first three months of 2017 compared with a use of cash in financing activities of $2.9 billion in the first three months of 2016. The change was driven primarily by an increase in short-term borrowings and lower payments on debt, partially offset by higher purchases of treasury stock.

At March 31, 2017, the total of worldwide cash and investments was $27.1 billion, including $15.2 billion of cash, cash equivalents and short-term investments and $11.9 billion of long-term investments. Generally 80%-90% of cash and investments are held by foreign subsidiaries that would be subject to significant tax payments if such cash and investments were repatriated in the form of dividends. The Company records U.S. deferred tax liabilities for certain unremitted earnings, but when amounts earned overseas are expected to be indefinitely reinvested outside of the United States, no accrual for U.S. taxes is provided. The amount of cash and investments held by U.S. and foreign subsidiaries fluctuates due to a variety of factors including the timing and receipt of payments in the normal course of business. Cash provided by operating activities in the United States continues to be the Company’s primary source of funds to finance domestic operating needs, capital expenditures, a portion of treasury stock purchases and dividends paid to shareholders.

Capital expenditures totaled $339 million and $279 million for the first three months of 2017 and 2016, respectively.

Dividends paid to stockholders were $1.3 billion for both the first three months of 2017 and 2016. In February 2017, the Board of Directors declared a quarterly dividend of $0.47 per share on the Company’s common stock that was paid in April 2017.

In March 2015, Merck’s board of directors authorized additional purchases of up to $10 billion of Merck’s common stock for its treasury. The treasury stock purchase has no time limit and will be made over time in open-market transactions, block transactions on or off an exchange, or in privately negotiated transactions. During the first three months of 2017, the Company purchased $1.0 billion (16 million shares) for its treasury. As of March 31, 2017, the Company’s remaining share repurchase authorization was $4.0 billion.

In February 2017, $300 million of floating rate notes matured in accordance with their terms and were repaid. In January 2016, $850 million of 2.2% notes matured in accordance with their terms and were repaid.

The Company has a $6.0 billion, five-year credit facility that matures in June 2021. The facility provides backup liquidity for the Company’s commercial paper borrowing facility and is to be used for general corporate purposes. The Company has not drawn funding from this facility.

Critical Accounting Policies

The Company’s significant accounting policies, which include management’s best estimates and judgments, are included in Note 2 to the consolidated financial statements for the year ended December 31, 2016 included in Merck’s Form 10‑K filed on February 28, 2017. Certain of these accounting policies are considered critical as disclosed in the Critical Accounting Policies section of Management’s Discussion and Analysis of Financial Condition and Results of Operations included in Merck’s Form 10-K because of the potential for a significant impact on the financial statements due to the inherent uncertainty in such estimates. There have been no significant changes in the Company’s critical accounting policies since December 31, 2016.

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Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (FASB) issued amended accounting guidance on revenue recognition that will be applied to all contracts with customers. The objective of the new guidance is to improve comparability of revenue recognition practices across entities and to provide more useful information to users of financial statements through improved disclosure requirements. In August 2015, the FASB approved a one-year deferral of the effective date making this guidance effective for interim and annual periods beginning in 2018. The new standard permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of adopting the guidance being recognized at the date of initial application (modified retrospective method). The Company will adopt the new standard on January 1, 2018 and currently plans to use the modified retrospective method. The majority of the Company’s business is ship and bill and, on that primary revenue stream, Merck does not expect significant differences. However, the Company’s analysis is preliminary and subject to change. Merck has not completed its assessment of multiple element arrangements and certain discount and trade promotion programs.

In January 2016, the FASB issued revised guidance for the accounting and reporting of financial instruments. The new guidance requires that equity investments with readily determinable fair values currently classified as available-for-sale be measured at fair value with changes in fair value recognized in net income. The new guidance also simplifies the impairment testing of equity investments without readily determinable fair values and changes certain disclosure requirements. This guidance is effective for interim and annual periods beginning in 2018. Early adoption is not permitted. The Company is currently assessing the impact of adoption on its consolidated financial statements.

In August 2016, the FASB issued guidance on the classification of certain cash receipts and payments in the statement of cash flows intended to reduce diversity in practice. The guidance is effective for interim and annual periods beginning in 2018. Early adoption is permitted. The guidance is to be applied retrospectively to all periods presented but may be applied prospectively if retrospective application would be impracticable. The Company is currently evaluating the effect of the standard on its Consolidated Statement of Cash Flows.

In October 2016, the FASB issued guidance on the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. Under existing guidance, the recognition of current and deferred income taxes for an intra-entity asset transfer is prohibited until the asset has been sold to a third party. The new guidance will require the recognition of the income tax consequences of an intra-entity transfer of an asset (with the exception of inventory) when the intra-entity transfer occurs. The guidance is effective for interim and annual periods beginning in 2018. Early adoption is permitted. The new guidance is to be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings in the beginning of the period of adoption. The Company does not anticipate the adoption of the new guidance will have a material effect on its consolidated financial statements.

In November 2016, the FASB issued guidance requiring that amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The guidance is effective for interim and annual periods beginning in 2018 and should be applied using a retrospective transition method to each period presented. Early adoption is permitted. The Company is currently evaluating the effect of the standard on its Consolidated Statement of Cash Flows.

In March 2017, the FASB amended the guidance related to net periodic benefit cost for defined benefit plans that requires entities to (1) disaggregate the current service cost component from the other components of net benefit cost and present it with other employee compensation costs in the income statement within operations if such a subtotal is presented; (2) present the other components of net benefit cost separately in the income statement and outside of income from operations; and (3) only capitalize the service cost component when applicable. The new guidance is effective for interim and annual periods in 2018. Entities must use a retrospective transition method to adopt the requirement for separate presentation in the income statement of service costs and other components and a prospective transition method to adopt the requirement to limit the capitalization of benefit costs to the service cost component. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In February 2016, the FASB issued new accounting guidance for the accounting and reporting of leases. The new guidance requires that lessees recognize a right-of-use asset and a lease liability recorded on the balance sheet for each of its leases (other than leases that meet the definition of a short-term lease).  Leases will be classified as either operating or finance. Operating leases will result in straight-line expense in the income statement (similar to current operating leases) while finance leases will result in more expense being recognized in the earlier years of the lease term (similar to current capital leases). The new guidance will be effective for interim and annual periods beginning in 2019. Early adoption is permitted. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In June 2016, the FASB issued amended guidance on the accounting for credit losses on financial instruments within its scope. The guidance introduces an expected loss model for estimating credit losses, replacing the incurred loss model. The new guidance also changes the impairment model for available-for-sale debt securities, requiring the use of an allowance to record

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estimated credit losses (and subsequent recoveries). The new guidance is effective for interim and annual periods beginning in 2020, with earlier application permitted in 2019. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In January 2017, the FASB issued guidance that provides for the elimination of Step 2 from the goodwill impairment test. If impairment charges are recognized, the amount recorded will be the amount by which the carrying amount exceeds the reporting unit’s fair value with certain limitations. The new guidance is effective for interim and annual periods in 2020. Early adoption is permitted. The Company does not anticipate the adoption of the new guidance will have a material effect on its consolidated financial statements.

Item 4. Controls and Procedures

Management of the Company, with the participation of its Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures over financial reporting for the period covered by this Form 10–Q. Based on this assessment, the Company’s Chief Executive Officer and Chief Financial Officer have concluded that as of March 31, 2017, the Company’s disclosure controls and procedures are effective. For the period covered by this report, there have been no changes in internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

CAUTIONARY FACTORS THAT MAY AFFECT FUTURE RESULTS

This report and other written reports and oral statements made from time to time by the Company may contain so-called “forward-looking statements,” all of which are based on management’s current expectations and are subject to risks and uncertainties which may cause results to differ materially from those set forth in the statements. One can identify these forward-looking statements by their use of words such as “anticipates,” “expects,” “plans,” “will,” “estimates,” “forecasts,” “projects” and other words of similar meaning. One can also identify them by the fact that they do not relate strictly to historical or current facts. These statements are likely to address the Company’s growth strategy, financial results, product development, product approvals, product potential and development programs. One must carefully consider any such statement and should understand that many factors could cause actual results to differ materially from the Company’s forward-looking statements. These factors include inaccurate assumptions and a broad variety of other risks and uncertainties, including some that are known and some that are not. No forward-looking statement can be guaranteed and actual future results may vary materially.

The Company does not assume the obligation to update any forward-looking statement. One should carefully evaluate such statements in light of factors, including risk factors, described in the Company’s filings with the Securities and Exchange Commission, especially on Forms 10-K, 10-Q and 8-K. In Item 1A. “Risk Factors” of the Company’s Annual Report on Form 10‑K for the year ended December 31, 2016, as filed on February 28, 2017, the Company discusses in more detail various important risk factors that could cause actual results to differ from expected or historic results. The Company notes these factors for investors as permitted by the Private Securities Litigation Reform Act of 1995. One should understand that it is not possible to predict or identify all such factors. Consequently, the reader should not consider any such list to be a complete statement of all potential risks or uncertainties.

PART II - Other Information

Item 1. Legal Proceedings

The information called for by this Item is incorporated herein by reference to Note 7 included in Part I, Item 1, Financial Statements (unaudited) — Notes to Condensed Consolidated Financial Statements.

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

Issuer purchases of equity securities for the three months ended March 31, 2017 were as follows:

ISSUER PURCHASES OF EQUITY SECURITIES

			($ in millions)
Period	Total Number of Shares Purchased(1)	Average Price Paid Per Share	Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plans or Programs(1)
January 1 - January 31	5,191,378	$60.83	$4,739
February 1 - February 28	4,933,139	$64.16	$4,422
March 1 - March 31	5,965,277	$64.81	$4,036
Total	16,089,794	$63.33	$4,036

⁽¹⁾  Shares purchased during the period were made as part of a plan approved by the Board of Directors in March 2015 to purchase up to $10 billion of Merck’s common stock for its treasury.

Item 6. Exhibits

Number		Description
3.1	—	Restated Certificate of Incorporation of Merck & Co., Inc. (November 3, 2009) – Incorporated by reference to Current Report on Form 8-K filed on November 4, 2009 (No. 1-6571)
3.2	—	By-Laws of Merck & Co., Inc. (effective July 22, 2015) – Incorporated by reference to Current Report on Form 8-K filed on July 28, 2015 (No. 1-6571)
31.1	—	Rule 13a – 14(a)/15d – 14(a) Certification of Chief Executive Officer
31.2	—	Rule 13a – 14(a)/15d – 14(a) Certification of Chief Financial Officer
32.1	—	Section 1350 Certification of Chief Executive Officer
32.2	—	Section 1350 Certification of Chief Financial Officer
101	—	The following materials from Merck & Co., Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017, formatted in XBRL (Extensible Business Reporting Language): (i) the Condensed Consolidated Statement of Income, (ii) the Condensed Consolidated Statement of Comprehensive Income, (iii) the Condensed Consolidated Balance Sheet, (iv) the Condensed Consolidated Statement of Cash Flows, and (v) Notes to the Condensed Consolidated Financial Statements.

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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.

	MERCK & CO., INC.
Date: May 9, 2017	/s/ Michael J. Holston
	MICHAEL J. HOLSTON
	Executive Vice President and General Counsel
Date: May 9, 2017	/s/ Rita A. Karachun
	RITA A. KARACHUN
	Senior Vice President Finance - Global Controller

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EXHIBIT INDEX

Number		Description
3.1	—	Restated Certificate of Incorporation of Merck & Co., Inc. (November 3, 2009) – Incorporated by reference to Current Report on Form 8-K filed on November 4, 2009 (No. 1-6571)
3.2	—	By-Laws of Merck & Co., Inc. (effective July 22, 2015) – Incorporated by reference to Current Report on Form 8-K filed on July 28, 2015 (No. 1-6571)
31.1	—	Rule 13a – 14(a)/15d – 14(a) Certification of Chief Executive Officer
31.2	—	Rule 13a – 14(a)/15d – 14(a) Certification of Chief Financial Officer
32.1	—	Section 1350 Certification of Chief Executive Officer
32.2	—	Section 1350 Certification of Chief Financial Officer
101	—	The following materials from Merck & Co., Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017, formatted in XBRL (Extensible Business Reporting Language): (i) the Condensed Consolidated Statement of Income, (ii) the Condensed Consolidated Statement of Comprehensive Income, (iii) the Condensed Consolidated Balance Sheet, (iv) the Condensed Consolidated Statement of Cash Flows, and (v) Notes to the Condensed Consolidated Financial Statements.

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EX-31.1

Exhibit 31.1

CERTIFICATION

I, Kenneth C. Frazier, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Merck & Co., Inc.;

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.

Date: May 9, 2017

By:	/s/ Kenneth C. Frazier
	KENNETH C. FRAZIER Chairman, President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Robert M. Davis, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Merck & Co., Inc.;

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.

Date:   May 9, 2017

By:	/s/ Robert M. Davis
	ROBERT M. DAVIS Executive Vice President, Chief Financial Officer & Global Services

EX-32.1

Exhibit 32.1

Section 1350

Certification of Chief Executive Officer

Pursuant to 18 U.S.C. Section 1350, the undersigned officer of Merck & Co., Inc. (the “Company”), hereby certifies that the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2017 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:  May 9, 2017	/s/ Kenneth C. Frazier
	Name: Title:	KENNETH C. FRAZIER Chairman, President and Chief Executive Officer

EX-32.2

Exhibit 32.2

Section 1350

Certification of Chief Financial Officer

Pursuant to 18 U.S.C. Section 1350, the undersigned officer of Merck & Co., Inc. (the “Company”), hereby certifies that the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2017 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:  May 9, 2017	/s/ Robert M. Davis
	Name: Title:	ROBERT M. DAVIS Executive Vice President, Chief Financial Officer & Global Services

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Trading Symbol	MRK
Entity Registrant Name	Merck & Co., Inc.
Entity Central Index Key	0000310158
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		2,735,164,510

XML

CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Sales	$ 9,434	$ 9,312
Costs, Expenses and Other
Materials and production	3,015	3,572
Marketing and administrative	2,411	2,318
Research and development	1,796	1,659
Restructuring costs	151	91
Other (income) expense, net	58	48
Total Costs, Expenses and Other	7,431	7,688
Income Before Taxes	2,003	1,624
Taxes on Income	447	494
Net Income	1,556	1,130
Less: Net Income Attributable to Noncontrolling Interests	5	5
Net Income Attributable to Merck & Co., Inc.	$ 1,551	$ 1,125
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share)	$ 0.56	$ 0.41
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share)	0.56	0.40
Dividends Declared per Common Share (in dollars per share)	$ 0.47	$ 0.46

XML

CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 1,551	$ 1,125
Other Comprehensive Income (Loss) Net of Taxes:
Net unrealized loss on derivatives, net of reclassifications	(232)	(202)
Net unrealized gain on investments, net of reclassifications	43	63
Benefit plan net gain (loss) and prior service credit (cost), net of amortization	26	(28)
Cumulative translation adjustment	309	121
Other comprehensive income (loss), net of taxes	146	(46)
Comprehensive Income Attributable to Merck & Co., Inc.	$ 1,697	$ 1,079

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CONDENSED CONSOLIDATED BALANCE SHEET - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 11,708	$ 6,515
Short-term investments	3,541	7,826
Accounts receivable (net of allowance for doubtful accounts of $195 in 2017 and 2016)	7,066	7,018
Inventories (excludes inventories of $1,090 in 2017 and $1,117 in 2016 classified in Other assets - see Note 5)	5,146	4,866
Other current assets	4,069	4,389
Total current assets	31,530	30,614
Investments	11,896	11,416
Property, Plant and Equipment, at cost, net of accumulated depreciation of $16,171 in 2017 and $15,749 in 2016	12,042	12,026
Goodwill	18,358	18,162
Other Intangibles, Net	16,863	17,305
Other Assets	5,872	5,854
Total Assets	96,561	95,377
Current Liabilities
Loans payable and current portion of long-term debt	5,037	568
Trade accounts payable	2,484	2,807
Accrued and other current liabilities	8,658	10,274
Income taxes payable	2,330	2,239
Dividends payable	1,314	1,316
Total current liabilities	19,823	17,204
Long-Term Debt	23,437	24,274
Deferred Income Taxes	4,889	5,077
Other Noncurrent Liabilities	8,324	8,514
Merck & Co., Inc. Stockholders’ Equity
Common stock, $0.50 par value Authorized - 6,500,000,000 shares Issued - 3,577,103,522 shares in 2017 and 2016	1,788	1,788
Other paid-in capital	39,899	39,939
Retained earnings	44,387	44,133
Accumulated other comprehensive loss	(5,080)	(5,226)
Stockholders' equity before deduction for treasury stock	80,994	80,634
Less treasury stock, at cost: 836,667,641 shares in 2017 and 828,372,200 shares in 2016	41,157	40,546
Total Merck & Co., Inc. stockholders’ equity	39,837	40,088
Noncontrolling Interests	251	220
Total equity	40,088	40,308
Liabilities and Equity	$ 96,561	$ 95,377

XML

CONDENSED CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 195	$ 195
Inventories classified in Other assets	1,090	1,117
Accumulated depreciation	$ 16,171	$ 15,749
Common stock, par value (in dollars per share)	$ 0.50	$ 0.50
Common stock, shares authorized (shares)	6,500,000,000	6,500,000,000
Common stock, shares issued (in shares)	3,577,103,522	3,577,103,522
Treasury stock, shares (shares)	836,667,641	828,372,200

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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities
Net income	$ 1,556	$ 1,130
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,193	1,561
Intangible asset impairment charges	80	277
Deferred income taxes	(54)	(70)
Share-based compensation	74	68
Other	(28)	82
Net changes in assets and liabilities	(2,535)	(875)
Net Cash Provided by Operating Activities	286	2,173
Cash Flows from Investing Activities
Capital expenditures	(339)	(279)
Purchases of securities and other investments	(2,929)	(2,367)
Proceeds from sales of securities and other investments	6,819	4,620
Acquisitions of businesses, net of cash acquired	(306)	(147)
Other	(52)	(86)
Net Cash Provided by Investing Activities	3,193	1,741
Cash Flows from Financing Activities
Net change in short-term borrowings	3,784	0
Payments on debt	(300)	(851)
Purchases of treasury stock	(1,019)	(913)
Dividends paid to stockholders	(1,294)	(1,279)
Proceeds from exercise of stock options	313	202
Other	(23)	(25)
Net Cash Provided by (Used in) Financing Activities	1,461	(2,866)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	253	144
Net Increase in Cash and Cash Equivalents	5,193	1,192
Cash and Cash Equivalents at Beginning of Year	6,515	8,524
Cash and Cash Equivalents at End of Period	$ 11,708	$ 9,716

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Basis of Presentation

3 Months Ended

Mar. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements of Merck & Co., Inc. (Merck or the Company) have been prepared pursuant to the rules and regulations for reporting on Form 10-Q. Accordingly, certain information and disclosures required by accounting principles generally accepted in the United States for complete consolidated financial statements are not included herein. These interim statements should be read in conjunction with the audited financial statements and notes thereto included in Merck’s Form 10-K filed on February 28, 2017.

The results of operations of any interim period are not necessarily indicative of the results of operations for the full year. In the Company’s opinion, all adjustments necessary for a fair statement of these interim statements have been included and are of a normal and recurring nature. Certain reclassifications have been made to prior year amounts to conform to the current presentation.

On December 31, 2016, Merck and Sanofi Pasteur S.A. terminated their equally-owned joint venture, Sanofi Pasteur MSD (SPMSD), which developed and marketed vaccines in Europe. Beginning in 2017, Merck is recording vaccine sales in the European markets that were previously part of the joint venture.

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (FASB) issued amended accounting guidance on revenue recognition that will be applied to all contracts with customers. The objective of the new guidance is to improve comparability of revenue recognition practices across entities and to provide more useful information to users of financial statements through improved disclosure requirements. In August 2015, the FASB approved a one-year deferral of the effective date making this guidance effective for interim and annual periods beginning in 2018. The new standard permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of adopting the guidance being recognized at the date of initial application (modified retrospective method). The Company will adopt the new standard on January 1, 2018 and currently plans to use the modified retrospective method. The majority of the Company’s business is ship and bill and, on that primary revenue stream, Merck does not expect significant differences. However, the Company’s analysis is preliminary and subject to change. Merck has not completed its assessment of multiple element arrangements and certain discount and trade promotion programs.

In January 2016, the FASB issued revised guidance for the accounting and reporting of financial instruments. The new guidance requires that equity investments with readily determinable fair values currently classified as available-for-sale be measured at fair value with changes in fair value recognized in net income. The new guidance also simplifies the impairment testing of equity investments without readily determinable fair values and changes certain disclosure requirements. This guidance is effective for interim and annual periods beginning in 2018. Early adoption is not permitted. The Company is currently assessing the impact of adoption on its consolidated financial statements.

In August 2016, the FASB issued guidance on the classification of certain cash receipts and payments in the statement of cash flows intended to reduce diversity in practice. The guidance is effective for interim and annual periods beginning in 2018. Early adoption is permitted. The guidance is to be applied retrospectively to all periods presented but may be applied prospectively if retrospective application would be impracticable. The Company is currently evaluating the effect of the standard on its Consolidated Statement of Cash Flows.

In October 2016, the FASB issued guidance on the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. Under existing guidance, the recognition of current and deferred income taxes for an intra-entity asset transfer is prohibited until the asset has been sold to a third party. The new guidance will require the recognition of the income tax consequences of an intra-entity transfer of an asset (with the exception of inventory) when the intra-entity transfer occurs. The guidance is effective for interim and annual periods beginning in 2018. Early adoption is permitted. The new guidance is to be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings in the beginning of the period of adoption. The Company does not anticipate the adoption of the new guidance will have a material effect on its consolidated financial statements.

In November 2016, the FASB issued guidance requiring that amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The guidance is effective for interim and annual periods beginning in 2018 and should be applied using a retrospective transition method to each period presented. Early adoption is permitted. The Company is currently evaluating the effect of the standard on its Consolidated Statement of Cash Flows.

In March 2017, the FASB amended the guidance related to net periodic benefit cost for defined benefit plans that requires entities to (1) disaggregate the current service cost component from the other components of net benefit cost and present it with other employee compensation costs in the income statement within operations if such a subtotal is presented; (2) present the other components of net benefit cost separately in the income statement and outside of income from operations; and (3) only capitalize the service cost component when applicable. The new guidance is effective for interim and annual periods in 2018. Entities must use a retrospective transition method to adopt the requirement for separate presentation in the income statement of service costs and other components and a prospective transition method to adopt the requirement to limit the capitalization of benefit costs to the service cost component. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In February 2016, the FASB issued new accounting guidance for the accounting and reporting of leases. The new guidance requires that lessees recognize a right-of-use asset and a lease liability recorded on the balance sheet for each of its leases (other than leases that meet the definition of a short-term lease).  Leases will be classified as either operating or finance. Operating leases will result in straight-line expense in the income statement (similar to current operating leases) while finance leases will result in more expense being recognized in the earlier years of the lease term (similar to current capital leases). The new guidance will be effective for interim and annual periods beginning in 2019. Early adoption is permitted. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In June 2016, the FASB issued amended guidance on the accounting for credit losses on financial instruments within its scope. The guidance introduces an expected loss model for estimating credit losses, replacing the incurred loss model. The new guidance also changes the impairment model for available-for-sale debt securities, requiring the use of an allowance to record estimated credit losses (and subsequent recoveries). The new guidance is effective for interim and annual periods beginning in 2020, with earlier application permitted in 2019. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In January 2017, the FASB issued guidance that provides for the elimination of Step 2 from the goodwill impairment test. If impairment charges are recognized, the amount recorded will be the amount by which the carrying amount exceeds the reporting unit’s fair value with certain limitations. The new guidance is effective for interim and annual periods in 2020. Early adoption is permitted. The Company does not anticipate the adoption of the new guidance will have a material effect on its consolidated financial statements.

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Acquisitions, Divestitures, Research Collaborations and License Agreements

3 Months Ended

Mar. 31, 2017

Business Combinations [Abstract]

Acquisitions, Divestitures, Research Collaborations and License Agreements

Acquisitions, Divestitures, Research Collaborations and License Agreements

The Company continues to pursue the acquisition of businesses and establishment of external alliances such as research collaborations and licensing agreements to complement its internal research capabilities. These arrangements often include upfront payments, as well as expense reimbursements or payments to the third party, and milestone, royalty or profit share payments, contingent upon the occurrence of certain future events linked to the success of the asset in development. The Company also reviews its marketed products and pipeline to examine candidates which may provide more value through out-licensing and, as part of its portfolio assessment process, may also divest certain assets. Pro forma financial information for acquired businesses is not presented if the historical financial results of the acquired entity are not significant when compared with the Company’s financial results.

In March 2017, Merck acquired a controlling interest in Vallée S.A. (Vallée), a leading privately held producer of animal health products in Brazil. Vallée has an extensive portfolio of products spanning parasiticides, anti-infectives and vaccines that include products for livestock, horses, and companion animals. Under the terms of the agreement, Merck acquired 93.5% of the shares of Vallée for $358 million. Of the total purchase price, $176 million was placed into escrow pending resolution of certain contingent items. The transaction was accounted for as an acquisition of a business. Merck recognized intangible assets of $297 million related to currently marketed products, net deferred tax liabilities of $95 million, other net assets of $1 million and noncontrolling interest of $25 million. In addition, the Company recorded liabilities of $37 million for contingencies identified at the acquisition date and corresponding indemnification assets of $37 million, representing the amounts to be reimbursed to Merck if and when the contingent liabilities are paid. The excess of the consideration transferred over the fair value of net assets acquired of $180 million was recorded as goodwill. The goodwill was allocated to the Animal Health segment and is not deductible for tax purposes. The estimated fair values of identifiable intangible assets related to currently marketed products were determined using an income approach through which fair value is estimated based on market participant expectations of each asset’s discounted projected net cash flows. The probability-adjusted future net cash flows of each product were then discounted to present value utilizing a discount rate of 15.5%. Actual cash flows are likely to be different than those assumed. The intangible assets related to currently marketed products are being amortized over their estimated useful lives of 15 years.

In January 2016, Merck acquired IOmet Pharma Ltd (IOmet), a privately held UK-based drug discovery company focused on the development of innovative medicines for the treatment of cancer, with a particular emphasis on the fields of cancer immunotherapy and cancer metabolism. The acquisition provides Merck with IOmet’s preclinical pipeline of IDO (indoleamine-2,3-dioxygenase 1), TDO (tryptophan-2,3-dioxygenase), and dual-acting IDO/TDO inhibitors. The transaction was accounted for as an acquisition of a business. Total purchase consideration in the transaction included a cash payment of $150 million and future additional milestone payments of up to $250 million that are contingent upon certain clinical and regulatory milestones being achieved. The Company determined the fair value of the contingent consideration was $94 million at the acquisition date utilizing a probability-weighted estimated cash flow stream adjusted for the expected timing of each payment utilizing a discount rate of 10.5%. Merck recognized intangible assets for in-process research and development (IPR&D) of $155 million and net deferred tax assets of $32 million. The excess of the consideration transferred over the fair value of net assets acquired of $57 million was recorded as goodwill that was allocated to the Pharmaceutical segment and is not deductible for tax purposes. The fair values of the identifiable intangible assets related to IPR&D were determined using an income approach. The assets’ probability-adjusted future net cash flows were then discounted to present value also using a discount rate of 10.5%. Actual cash flows are likely to be different than those assumed.

Additionally, in January 2016, Merck sold the U.S. marketing rights to Cortrophin and Corticotropin Zinc Hydroxide to ANI Pharmaceuticals, Inc. (ANI). Under the terms of the agreement, ANI made a payment of $75 million, which was recorded in Sales in the first quarter of 2016, and may make additional payments to the Company based on future sales. Merck does not have any ongoing supply or other performance obligations after the closing date.

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Restructuring

3 Months Ended

Mar. 31, 2017

Restructuring and Related Activities [Abstract]

Restructuring

Restructuring

The Company incurs substantial costs for restructuring program activities related to Merck’s productivity and cost reduction initiatives, as well as in connection with the integration of certain acquired businesses. In 2010 and 2013, the Company commenced actions under global restructuring programs designed to streamline its cost structure. The actions under these programs include the elimination of positions in sales, administrative and headquarters organizations, as well as the sale or closure of certain manufacturing and research and development sites and the consolidation of office facilities. The Company also continues to reduce its global real estate footprint and improve the efficiency of its manufacturing and supply network. The non-facility related restructuring actions under these programs are substantially complete; the remaining activities primarily relate to ongoing facility rationalizations.

The Company recorded total pretax costs of $215 million and $196 million in the first quarter of 2017 and 2016, respectively, related to restructuring program activities. Since inception of the programs through March 31, 2017, Merck has recorded total pretax accumulated costs of approximately $12.8 billion and eliminated approximately 41,445 positions comprised of employee separations, as well as the elimination of contractors and vacant positions. The Company expects to substantially complete the remaining actions under these programs by the end of 2017 and incur approximately $500 million of additional pretax costs. The Company estimates that approximately two-thirds of the cumulative pretax costs will result in cash outlays, primarily related to employee separation expense. Approximately one-third of the cumulative pretax costs are non-cash, relating primarily to the accelerated depreciation of facilities to be closed or divested.

For segment reporting, restructuring charges are unallocated expenses.

The following tables summarize the charges related to restructuring program activities by type of cost:

	Three Months Ended March 31, 2017
($ in millions)	Separation Costs		Accelerated Depreciation			Other		Total
Materials and production	$	—	$	51		$	12	$	63
Marketing and administrative	—		—			1		1
Research and development	—		(2		)	2		—
Restructuring costs	84		—			67		151
	$	84	$	49		$	82	$	215

	Three Months Ended March 31, 2016
($ in millions)	Separation Costs		Accelerated Depreciation		Other		Total
Materials and production	$	—	$	22	$	25	$	47
Marketing and administrative	—		3		—		3
Research and development	—		55		—		55
Restructuring costs	26		—		65		91
	$	26	$	80	$	90	$	196

Separation costs are associated with actual headcount reductions, as well as those headcount reductions which were probable and could be reasonably estimated. In the first quarter of 2017 and 2016, approximately 545 positions and 470 positions, respectively, were eliminated under restructuring program activities.

Accelerated depreciation costs primarily relate to manufacturing, research and administrative facilities and equipment to be sold or closed as part of the programs. Accelerated depreciation costs represent the difference between the depreciation expense to be recognized over the revised useful life of the asset, based upon the anticipated date the site will be closed or divested or the equipment disposed of, and depreciation expense as determined utilizing the useful life prior to the restructuring actions. All of the sites have and will continue to operate up through the respective closure dates and, since future undiscounted cash flows were sufficient to recover the respective book values, Merck is recording accelerated depreciation over the revised useful life of the site assets. Anticipated site closure dates, particularly related to manufacturing locations, have been and may continue to be adjusted to reflect changes resulting from regulatory or other factors.

Other activity in 2017 and 2016 includes asset abandonment, shut-down and other related costs, as well as pretax gains and losses resulting from sales of facilities and related assets. Additionally, other activity includes certain employee-related costs associated with pension and other postretirement benefit plans (see Note 10) and share-based compensation.

The following table summarizes the charges and spending relating to restructuring program activities for the three months ended March 31, 2017:

($ in millions)	Separation Costs			Accelerated Depreciation			Other			Total
Restructuring reserves January 1, 2017	$	395		$	—		$	146		$	541
Expense	84			49			82			215
(Payments) receipts, net	(103		)	—			(118		)	(221		)
Non-cash activity	—			(49		)	27			(22		)
Restructuring reserves March 31, 2017 (1)	$	376		$	—		$	137		$	513

⁽¹⁾  The remaining cash outlays are expected to be substantially completed by the end of 2017.

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Financial Instruments

3 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments

Financial Instruments

Derivative Instruments and Hedging Activities

The Company manages the impact of foreign exchange rate movements and interest rate movements on its earnings, cash flows and fair values of assets and liabilities through operational means and through the use of various financial instruments, including derivative instruments.

A significant portion of the Company’s revenues and earnings in foreign affiliates is exposed to changes in foreign exchange rates. The objectives and accounting related to the Company’s foreign currency risk management program, as well as its interest rate risk management activities are discussed below.

Foreign Currency Risk Management

The Company has established revenue hedging, balance sheet risk management and net investment hedging programs to protect against volatility of future foreign currency cash flows and changes in fair value caused by volatility in foreign exchange rates.

The objective of the revenue hedging program is to reduce the variability caused by changes in foreign exchange rates that would affect the U.S. dollar value of future cash flows derived from foreign currency denominated sales, primarily the euro and Japanese yen. To achieve this objective, the Company will hedge a portion of its forecasted foreign currency denominated third-party and intercompany distributor entity sales (forecasted sales) that are expected to occur over its planning cycle, typically no more than two years into the future. The Company will layer in hedges over time, increasing the portion of forecasted sales hedged as it gets closer to the expected date of the forecasted foreign currency denominated sales. The portion of forecasted sales hedged is based on assessments of cost-benefit profiles that consider natural offsetting exposures, revenue and exchange rate volatilities and correlations, and the cost of hedging instruments. The Company manages its anticipated transaction exposure principally with purchased local currency put options, forward contracts and purchased collar options.

The fair values of these derivative contracts are recorded as either assets (gain positions) or liabilities (loss positions) in the Condensed Consolidated Balance Sheet. Changes in the fair value of derivative contracts are recorded each period in either current earnings or Other comprehensive income (OCI), depending on whether the derivative is designated as part of a hedge transaction and, if so, the type of hedge transaction. For derivatives that are designated as cash flow hedges, the effective portion of the unrealized gains or losses on these contracts is recorded in Accumulated other comprehensive income (AOCI) and reclassified into Sales when the hedged anticipated revenue is recognized. The hedge relationship is highly effective and hedge ineffectiveness has been de minimis. For those derivatives which are not designated as cash flow hedges, but serve as economic hedges of forecasted sales, unrealized gains or losses are recorded in Sales each period. The cash flows from both designated and non-designated contracts are reported as operating activities in the Condensed Consolidated Statement of Cash Flows. The Company does not enter into derivatives for trading or speculative purposes.

The Company manages operating activities and net asset positions at each local subsidiary in order to mitigate the effects of exchange on monetary assets and liabilities. The Company also uses a balance sheet risk management program to mitigate the exposure of net monetary assets that are denominated in a currency other than a subsidiary’s functional currency from the effects of volatility in foreign exchange. In these instances, Merck principally utilizes forward exchange contracts to offset the effects of exchange on exposures denominated in developed country currencies, primarily the euro and Japanese yen. For exposures in developing country currencies, the Company will enter into forward contracts to partially offset the effects of exchange on exposures when it is deemed economical to do so based on a cost-benefit analysis that considers the magnitude of the exposure, the volatility of the exchange rate and the cost of the hedging instrument. The cash flows from these contracts are reported as operating activities in the Condensed Consolidated Statement of Cash Flows.

Monetary assets and liabilities denominated in a currency other than the functional currency of a given subsidiary are remeasured at spot rates in effect on the balance sheet date with the effects of changes in spot rates reported in Other (income) expense, net. The forward contracts are not designated as hedges and are marked to market through Other (income) expense, net. Accordingly, fair value changes in the forward contracts help mitigate the changes in the value of the remeasured assets and liabilities attributable to changes in foreign currency exchange rates, except to the extent of the spot-forward differences. These differences are not significant due to the short-term nature of the contracts, which typically have average maturities at inception of less than one year.

The Company may also use forward exchange contracts to hedge its net investment in foreign operations against movements in exchange rates. The forward contracts are designated as hedges of the net investment in a foreign operation. The Company hedges a portion of the net investment in certain of its foreign operations and measures ineffectiveness based upon changes in spot foreign exchange rates that are recorded in Other (income) expense, net. The effective portion of the unrealized gains or losses on these contracts is recorded in foreign currency translation adjustment within OCI, and remains in AOCI until either the sale or complete or substantially complete liquidation of the subsidiary. The cash flows from these contracts are reported as investing activities in the Condensed Consolidated Statement of Cash Flows.

Foreign exchange risk is also managed through the use of foreign currency debt. The Company’s senior unsecured euro-denominated notes have been designated as, and are effective as, economic hedges of the net investment in a foreign operation. Accordingly, foreign currency transaction gains or losses due to spot rate fluctuations on the euro-denominated debt instruments are included in foreign currency translation adjustment within OCI. Included in the cumulative translation adjustment are pretax losses of $135 million and $58 million for the first three months of 2017 and 2016, respectively, from the euro-denominated notes.

Interest Rate Risk Management

The Company may use interest rate swap contracts on certain investing and borrowing transactions to manage its net exposure to interest rate changes and to reduce its overall cost of borrowing. The Company does not use leveraged swaps and, in general, does not leverage any of its investment activities that would put principal capital at risk.

At March 31, 2017, the Company was a party to 26 pay-floating, receive-fixed interest rate swap contracts designated as fair value hedges of fixed-rate notes in which the notional amounts match the amount of the hedged fixed-rate notes as detailed in the table below.

($ in millions)	March 31, 2017
Debt Instrument	Par Value of Debt		Number of Interest Rate Swaps Held	Total Swap Notional Amount
1.30% notes due 2018	$	1,000	4	$	1,000
5.00% notes due 2019	1,250		3	550
1.85% notes due 2020	1,250		5	1,250
3.875% notes due 2021	1,150		5	1,150
2.40% notes due 2022	1,000		4	1,000
2.35% notes due 2022	1,250		5	1,250

The interest rate swap contracts are designated hedges of the fair value changes in the notes attributable to changes in the benchmark London Interbank Offered Rate (LIBOR) swap rate. The fair value changes in the notes attributable to changes in the LIBOR swap rate are recorded in interest expense and offset by the fair value changes in the swap contracts. The cash flows from these contracts are reported as operating activities in the Condensed Consolidated Statement of Cash Flows.

Presented in the table below is the fair value of derivatives on a gross basis segregated between those derivatives that are designated as hedging instruments and those that are not designated as hedging instruments:

		March 31, 2017						December 31, 2016
		Fair Value of Derivative				U.S. Dollar Notional		Fair Value of Derivative				U.S. Dollar Notional
($ in millions)	Balance Sheet Caption	Asset		Liability				Asset		Liability
Derivatives Designated as Hedging Instruments
Interest rate swap contracts	Other assets	$	11	$	—	$	2,700	$	20	$	—	$	2,700
Interest rate swap contracts	Other noncurrent liabilities	—		35		3,500		—		29		3,500
Foreign exchange contracts	Other current assets	330		—		5,049		616		—		6,063
Foreign exchange contracts	Other assets	56		—		1,815		129		—		2,075
Foreign exchange contracts	Accrued and other current liabilities	—		21		915		—		1		48
Foreign exchange contracts	Other noncurrent liabilities	—		1		20		—		1		12
		$	397	$	57	$	13,999	$	765	$	31	$	14,398
Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts	Other current assets	$	232	$	—	$	8,037	$	230	$	—	$	8,210
Foreign exchange contracts	Accrued and other current liabilities	—		89		6,479		—		103		2,931
		$	232	$	89	$	14,516	$	230	$	103	$	11,141
		$	629	$	146	$	28,515	$	995	$	134	$	25,539

As noted above, the Company records its derivatives on a gross basis in the Condensed Consolidated Balance Sheet. The Company has master netting agreements with several of its financial institution counterparties (see Concentrations of Credit Risk below). The following table provides information on the Company’s derivative positions subject to these master netting arrangements as if they were presented on a net basis, allowing for the right of offset by counterparty and cash collateral exchanged per the master agreements and related credit support annexes:

	March 31, 2017						December 31, 2016
($ in millions)	Asset			Liability			Asset			Liability
Gross amounts recognized in the consolidated balance sheet	$	629		$	146		$	995		$	134
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet	(144		)	(144		)	(131		)	(131		)
Cash collateral received	(222		)	—			(529		)	—
Net amounts	$	263		$	2		$	335		$	3

The table below provides information on the location and pretax gain or loss amounts for derivatives that are: (i) designated in a fair value hedging relationship, (ii) designated in a foreign currency cash flow hedging relationship and (iii) not designated in a hedging relationship:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Derivatives designated in a fair value hedging relationship
Interest rate swap contracts
Amount of loss (gain) recognized in Other (income) expense, net on derivatives (1)	$	15		$	(150	)
Amount of (gain) loss recognized in Other (income) expense, net on hedged item (1)	(16		)	147
Derivatives designated in foreign currency cash flow hedging relationships
Foreign exchange contracts
Amount of gain reclassified from AOCI to Sales	(94		)	(143		)
Amount of loss recognized in OCI on derivatives	263			167
Derivatives not designated in a hedging relationship
Foreign exchange contracts
Amount of (gain) loss recognized in Other (income) expense, net on derivatives (2)	(47		)	24

⁽¹⁾ There was $1 million and $3 million of ineffectiveness on the hedge during the first quarter of 2017 and 2016, respectively.

⁽²⁾ These derivative contracts mitigate changes in the value of remeasured foreign currency denominated monetary assets and liabilities attributable to changes in foreign currency exchange rates.

At March 31, 2017, the Company estimates $167 million of pretax net unrealized gains on derivatives maturing within the next 12 months that hedge foreign currency denominated sales over that same period will be reclassified from AOCI to Sales. The amount ultimately reclassified to Sales may differ as foreign exchange rates change. Realized gains and losses are ultimately determined by actual exchange rates at maturity.

Investments in Debt and Equity Securities

Information on investments in debt and equity securities is as follows:

	March 31, 2017									December 31, 2016
	Fair Value		Amortized Cost		Gross Unrealized					Fair Value		Amortized Cost		Gross Unrealized
($ in millions)					Gains		Losses							Gains		Losses
Corporate notes and bonds	$	10,445	$	10,455	$	19	$	(29	)	$	10,577	$	10,601	$	15	$	(39	)
U.S. government and agency securities	2,011		2,021		1		(11		)	2,232		2,244		1		(13		)
Asset-backed securities	1,410		1,411		2		(3		)	1,376		1,380		1		(5		)
Commercial paper	773		773		—		—			4,330		4,330		—		—
Mortgage-backed securities	712		717		—		(5		)	796		801		1		(6		)
Foreign government bonds	560		561		1		(2		)	519		521		—		(2		)
Equity securities	356		278		79		(1		)	349		281		71		(3		)
	$	16,267	$	16,216	$	102	$	(51	)	$	20,179	$	20,158	$	89	$	(68	)

Available-for-sale debt securities included in Short-term investments totaled $3.5 billion at March 31, 2017. Of the remaining debt securities, $10.6 billion mature within five years. At March 31, 2017 and December 31, 2016, there were no debt securities pledged as collateral.

Fair Value Measurements

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company uses a fair value hierarchy which maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. There are three levels of inputs used to measure fair value with Level 1 having the highest priority and Level 3 having the lowest:

Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 - Unobservable inputs that are supported by little or no market activity. Level 3 assets or liabilities are those whose values are determined using pricing models, discounted cash flow methodologies, or similar techniques with significant unobservable inputs, as well as assets or liabilities for which the determination of fair value requires significant judgment or estimation.

If the inputs used to measure the financial assets and liabilities fall within more than one level described above, the categorization is based on the lowest level input that is significant to the fair value measurement of the instrument.

Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

Financial assets and liabilities measured at fair value on a recurring basis are summarized below:

	Fair Value Measurements Using								Fair Value Measurements Using
	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total		Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
($ in millions)	March 31, 2017								December 31, 2016
Assets
Investments
Corporate notes and bonds	$	—	$	10,287	$	—	$	10,287	$	—	$	10,389	$	—	$	10,389
U.S. government and agency securities	66		1,647		—		1,713		29		1,890		—		1,919
Asset-backed securities (1)	—		1,312		—		1,312		—		1,257		—		1,257
Commercial paper	—		773		—		773		—		4,330		—		4,330
Mortgage-backed securities (1)	—		595		—		595		—		628		—		628
Foreign government bonds	—		559		—		559		—		518		—		518
Equity securities	198		—		—		198		201		—		—		201
	264		15,173		—		15,437		230		19,012		—		19,242
Other assets
U.S. government and agency securities	—		298		—		298		—		313		—		313
Corporate notes and bonds	—		158		—		158		—		188		—		188
Mortgage-backed securities (1)	—		117		—		117		—		168		—		168
Asset-backed securities (1)	—		98		—		98		—		119		—		119
Foreign government bonds	—		1		—		1		—		1		—		1
Equity securities	158		—		—		158		148		—		—		148
	158		672		—		830		148		789		—		937
Derivative assets (2)
Purchased currency options	—		354		—		354		—		644		—		644
Forward exchange contracts	—		264		—		264		—		331		—		331
Interest rate swaps	—		11		—		11		—		20		—		20
	—		629		—		629		—		995		—		995
Total assets	$	422	$	16,474	$	—	$	16,896	$	378	$	20,796	$	—	$	21,174
Liabilities
Other liabilities
Contingent consideration	$	—	$	—	$	925	$	925	$	—	$	—	$	891	$	891
Derivative liabilities (2)
Forward exchange contracts	—		110		—		110		—		93		—		93
Interest rate swaps	—		35		—		35		—		29		—		29
Written currency options	—		1		—		1		—		12		—		12
	—		146		—		146		—		134		—		134
Total liabilities	$	—	$	146	$	925	$	1,071	$	—	$	134	$	891	$	1,025

⁽¹⁾  Primarily all of the asset-backed securities are highly-rated (Standard & Poor’s rating of AAA and Moody’s Investors Service rating of Aaa), secured primarily by auto loan, credit card and student loan receivables, with weighted-average lives of primarily 5 years or less. Mortgage-backed securities represent AAA-rated securities issued or unconditionally guaranteed as to payment of principal and interest by U.S. government agencies.

⁽²⁾  The fair value determination of derivatives includes the impact of the credit risk of counterparties to the derivatives and the Company’s own credit risk, the effects of which were not significant.

There were no transfers between Level 1 and Level 2 during the first three months of 2017. As of March 31, 2017, Cash and cash equivalents of $11.7 billion included $10.9 billion of cash equivalents (considered Level 2 in the fair value hierarchy).

Contingent Consideration

Summarized information about the changes in liabilities for contingent consideration is as follows:

	Three Months Ended March 31,
($ in millions)	2017		2016
Fair value January 1	$	891	$	590
Changes in fair value (1)	34		10
Additions	—		77
Payments	—		(25		)
Fair value March 31	$	925	$	652

⁽¹⁾ Recorded in Research and development expenses, Materials and production costs and Other (income) expense, net. Includes cumulative translation adjustments.

The additions to contingent consideration in the first quarter of 2016 relate to the acquisition of IOmet (see Note 2). The payments of contingent consideration in the first quarter of 2016 relate to the first commercial sale of Zerbaxa in the European Union.

Other Fair Value Measurements

Some of the Company’s financial instruments, such as cash and cash equivalents, receivables and payables, are reflected in the balance sheet at carrying value, which approximates fair value due to their short-term nature.

The estimated fair value of loans payable and long-term debt (including current portion) at March 31, 2017, was $29.3 billion compared with a carrying value of $28.5 billion and at December 31, 2016, was $25.7 billion compared with a carrying value of $24.8 billion. Fair value was estimated using recent observable market prices and would be considered Level 2 in the fair value hierarchy.

Concentrations of Credit Risk

On an ongoing basis, the Company monitors concentrations of credit risk associated with corporate and government issuers of securities and financial institutions with which it conducts business. Credit exposure limits are established to limit a concentration with any single issuer or institution. Cash and investments are placed in instruments that meet high credit quality standards as specified in the Company’s investment policy guidelines.

The majority of the Company’s accounts receivable arise from product sales in the United States and Europe and are primarily due from drug wholesalers and retailers, hospitals, government agencies, managed health care providers and pharmacy benefit managers. The Company monitors the financial performance and creditworthiness of its customers so that it can properly assess and respond to changes in their credit profile. The Company also continues to monitor economic conditions, including the volatility associated with international sovereign economies, and associated impacts on the financial markets and its business, taking into consideration global economic conditions and the ongoing sovereign debt issues in certain European countries. At March 31, 2017, the Company’s total net accounts receivable outstanding for more than one year were approximately $135 million. The Company does not expect to have write-offs or adjustments to accounts receivable which would have a material adverse effect on its financial position, liquidity or results of operations.

Derivative financial instruments are executed under International Swaps and Derivatives Association master agreements. The master agreements with several of the Company’s financial institution counterparties also include credit support annexes. These annexes contain provisions that require collateral to be exchanged depending on the value of the derivative assets and liabilities, the Company’s credit rating, and the credit rating of the counterparty. As of March 31, 2017 and December 31, 2016, the Company had received cash collateral of $222 million and $529 million, respectively, from various counterparties and the obligation to return such collateral is recorded in Accrued and other current liabilities. The Company had not advanced any cash collateral to counterparties as of March 31, 2017 or December 31, 2016.

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Inventories

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories consisted of:

($ in millions)	March 31, 2017		December 31, 2016
Finished goods	$	1,355	$	1,304
Raw materials and work in process	4,446		4,222
Supplies	160		155
Total (approximates current cost)	5,961		5,681
Increase to LIFO costs	275		302
	$	6,236	$	5,983
Recognized as:
Inventories	$	5,146	$	4,866
Other assets	1,090		1,117

Amounts recognized as Other assets are comprised almost entirely of raw materials and work in process inventories. At March 31, 2017 and December 31, 2016, these amounts included $1.0 billion of inventories not expected to be sold within one year. In addition, these amounts included $80 million at March 31, 2017 and December 31, 2016 of inventories produced in preparation for product launches.

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Other Intangibles

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangibles

Other Intangibles

In connection with acquisitions, the Company measures the fair value of marketed products and research and development pipeline programs and capitalizes these amounts. See Note 2 for information on intangible assets acquired as a result of business acquisitions in the first quarter of 2017 and 2016.

During the first quarter of 2016, the Company recorded an intangible asset impairment charge of $252 million within Materials and production costs related to Zontivity, a product for the reduction of thrombotic cardiovascular events in patients with a history of myocardial infarction or with peripheral arterial disease. In March 2016, following several business decisions that reduced sales expectations for Zontivity in the United States and Europe, the Company lowered its cash flow projections for Zontivity. The Company utilized market participant assumptions and considered several different scenarios to determine the fair value of the intangible asset related to Zontivity that, when compared with its related carrying value, resulted in the impairment charge noted above.

Also during the first quarter of 2016, the Company recorded $25 million of IPR&D impairment charges within Research and development expenses primarily related to deprioritized pipeline programs that were deemed to have no alternative use during the period.

The Company may recognize additional non-cash impairment charges in the future related to other marketed products or pipeline programs and such charges could be material.

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Contingencies

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Contingencies

Contingencies

The Company is involved in various claims and legal proceedings of a nature considered normal to its business, including product liability, intellectual property, and commercial litigation, as well as certain additional matters including environmental matters. In the opinion of the Company, it is unlikely that the resolution of these matters will be material to the Company’s financial position, results of operations or cash flows.

Given the nature of the litigation discussed below and the complexities involved in these matters, the Company is unable to reasonably estimate a possible loss or range of possible loss for such matters until the Company knows, among other factors, (i) what claims, if any, will survive dispositive motion practice, (ii) the extent of the claims, including the size of any potential class, particularly when damages are not specified or are indeterminate, (iii) how the discovery process will affect the litigation, (iv) the settlement posture of the other parties to the litigation and (v) any other factors that may have a material effect on the litigation.

The Company records accruals for contingencies when it is probable that a liability has been incurred and the amount can be reasonably estimated. These accruals are adjusted periodically as assessments change or additional information becomes available. For product liability claims, a portion of the overall accrual is actuarially determined and considers such factors as past experience, number of claims reported and estimates of claims incurred but not yet reported. Individually significant contingent losses are accrued when probable and reasonably estimable. Legal defense costs expected to be incurred in connection with a loss contingency are accrued when probable and reasonably estimable.

The Company’s decision to obtain insurance coverage is dependent on market conditions, including cost and availability, existing at the time such decisions are made. The Company has evaluated its risks and has determined that the cost of obtaining product liability insurance outweighs the likely benefits of the coverage that is available and, as such, has no insurance for most product liabilities effective August 1, 2004.

Product Liability Litigation

Fosamax

As previously disclosed, Merck is a defendant in product liability lawsuits in the United States involving Fosamax (Fosamax Litigation). As of March 31, 2017, approximately 4,215 cases are filed and pending against Merck in either federal or state court. In approximately 20 of these actions, plaintiffs allege, among other things, that they have suffered osteonecrosis of the jaw (ONJ), generally subsequent to invasive dental procedures, such as tooth extraction or dental implants and/or delayed healing, in association with the use of Fosamax. In addition, plaintiffs in approximately 4,195 of these actions generally allege that they sustained femur fractures and/or other bone injuries (Femur Fractures) in association with the use of Fosamax.

Cases Alleging ONJ and/or Other Jaw Related Injuries

In August 2006, the Judicial Panel on Multidistrict Litigation (JPML) ordered that certain Fosamax product liability cases pending in federal courts nationwide should be transferred and consolidated into one multidistrict litigation (Fosamax ONJ MDL) for coordinated pre-trial proceedings.

In December 2013, Merck reached an agreement in principle with the Plaintiffs’ Steering Committee (PSC) in the Fosamax ONJ MDL to resolve pending ONJ cases not on appeal in the Fosamax ONJ MDL and in the state courts for an aggregate amount of $27.7 million. Merck and the PSC subsequently formalized the terms of this agreement in a Master Settlement Agreement (ONJ Master Settlement Agreement) that was executed in April 2014 and included over 1,200 plaintiffs. In July 2014, Merck elected to proceed with the ONJ Master Settlement Agreement at a reduced funding level of $27.3 million since the participation level was approximately 95%. Merck has fully funded the ONJ Master Settlement Agreement and the escrow agent under the agreement has been making settlement payments to qualifying plaintiffs. The ONJ Master Settlement Agreement has no effect on the cases alleging Femur Fractures discussed below.

Discovery is currently ongoing in some of the approximately 20 remaining ONJ cases that are pending in various federal and state courts and the Company intends to defend against these lawsuits.

Cases Alleging Femur Fractures

In March 2011, Merck submitted a Motion to Transfer to the JPML seeking to have all federal cases alleging Femur Fractures consolidated into one multidistrict litigation for coordinated pre-trial proceedings. The Motion to Transfer was granted in May 2011, and all federal cases involving allegations of Femur Fracture have been or will be transferred to a multidistrict litigation in the District of New Jersey (Femur Fracture MDL). In the only bellwether case tried to date in the Femur Fracture MDL, Glynn v. Merck, the jury returned a verdict in Merck’s favor. In addition, in June 2013, the Femur Fracture MDL court granted Merck’s motion for judgment as a matter of law in the Glynn case and held that the plaintiff’s failure to warn claim was preempted by federal law. The Glynn decision was not appealed by plaintiff.

In August 2013, the Femur Fracture MDL court entered an order requiring plaintiffs in the Femur Fracture MDL to show cause why those cases asserting claims for a femur fracture injury that took place prior to September 14, 2010, should not be dismissed based on the court’s preemption decision in the Glynn case. Pursuant to the show cause order, in March 2014, the Femur Fracture MDL court dismissed with prejudice approximately 650 cases on preemption grounds. Plaintiffs in approximately 515 of those cases appealed that decision to the U.S. Court of Appeals for the Third Circuit (Third Circuit). The Femur Fracture MDL court also dismissed without prejudice another approximately 540 cases pending plaintiffs’ appeal of the preemption ruling to the Third Circuit. On March 22, 2017, the Third Circuit issued a decision reversing the Femur Fracture MDL court’s preemption ruling and remanding the appealed cases back to the Femur Fracture MDL court. On April 5, 2017, Merck filed a petition seeking a rehearing on the Third Circuit’s March 22, 2017 decision, which was denied on April 24, 2017.

In addition, in June 2014, the Femur Fracture MDL court granted Merck summary judgment in the Gaynor v. Merck case and found that Merck’s updates in January 2011 to the Fosamax label regarding atypical femur fractures were adequate as a matter of law and that Merck adequately communicated those changes. The plaintiffs in Gaynor did not appeal the Femur Fracture MDL court’s findings with respect to the adequacy of the 2011 label change but did appeal the dismissal of their case based on preemption grounds, and the Third Circuit subsequently reversed that dismissal in its March 22, 2017 decision. In August 2014, Merck filed a motion requesting that the Femur Fracture MDL court enter a further order requiring all plaintiffs in the Femur Fracture MDL who claim that the 2011 Fosamax label is inadequate and the proximate cause of their alleged injuries to show cause why their cases should not be dismissed based on the court’s preemption decision and its ruling in the Gaynor case. In November 2014, the court granted Merck’s motion and entered the requested show cause order. No plaintiffs responded to or appealed the November 2014 show cause order.

As of March 31, 2017, seven cases were pending in the Femur Fracture MDL, excluding the 515 cases dismissed with prejudice on preemption grounds that are pending the final resolution of all appeals of the Femur Fracture MDL court’s March 2014 preemption decision and the 540 cases dismissed without prejudice that are also pending the final resolution of the aforementioned appeal.

As of March 31, 2017, approximately 2,855 cases alleging Femur Fractures have been filed in New Jersey state court and are pending before Judge Jessica Mayer in Middlesex County. The parties selected an initial group of 30 cases to be reviewed through fact discovery. Two additional groups of 50 cases each to be reviewed through fact discovery were selected in November 2013 and March 2014, respectively. A further group of 25 cases to be reviewed through fact discovery was selected by Merck in July 2015, and Merck has continued to select additional cases to be reviewed through fact discovery during 2016 and 2017.

As of March 31, 2017, approximately 280 cases alleging Femur Fractures have been filed and are pending in California state court. A petition was filed seeking to coordinate all Femur Fracture cases filed in California state court before a single judge in Orange County, California. The petition was granted and Judge Thierry Colaw is currently presiding over the coordinated proceedings. In March 2014, the court directed that a group of 10 discovery pool cases be reviewed through fact discovery and subsequently scheduled the Galper v. Merck case, which plaintiffs selected, as the first trial. The Galper trial began in February 2015 and the jury returned a verdict in Merck’s favor in April 2015, and plaintiff has appealed that verdict to the California appellate court. Oral argument on plaintiff’s appeal in Galper was held on November 17, 2016 and, on April 24, 2017, the California appellate court issued a decision affirming the lower court’s judgment in favor of Merck. The next Femur Fracture trial in California that was scheduled to begin in April 2016 was stayed at plaintiffs’ request and a new trial date has not been set.

Additionally, there are five Femur Fracture cases pending in other state courts.

Discovery is ongoing in the Femur Fracture MDL and in state courts where Femur Fracture cases are pending and the Company intends to defend against these lawsuits.

Januvia/Janumet

As previously disclosed, Merck is a defendant in product liability lawsuits in the United States involving Januvia and/or Janumet. As of March 31, 2017, Merck is aware of approximately 1,200 product user claims alleging generally that use of Januvia and/or Janumet caused the development of pancreatic cancer and other injuries. These complaints were filed in several different state and federal courts.

Most of the claims were filed in a consolidated multidistrict litigation proceeding in the U.S. District Court for the Southern District of California called “In re Incretin-Based Therapies Products Liability Litigation” (MDL). The MDL includes federal lawsuits alleging pancreatic cancer due to use of the following medicines: Januvia, Janumet, Byetta and Victoza, the latter two of which are products manufactured by other pharmaceutical companies. The majority of claims not filed in the MDL were filed in the Superior Court of California, County of Los Angeles (California State Court).

In November 2015, the MDL and California State Court - in separate opinions - granted summary judgment to defendants on grounds of preemption. Of the approximately 1,200 product user claims, these rulings resulted in the dismissal of approximately 1,150 product user claims.

Plaintiffs are appealing the MDL and California State Court preemption rulings.

As of March 31, 2017, eight product users have claims pending against Merck in state courts other than the California State Court, including four active product user claims pending in Illinois state court. On March 30, 2017, the Illinois court held oral argument on Merck’s motion for summary judgment on grounds of preemption. A decision is expected in May 2017.

In addition to the claims noted above, the Company has agreed, as of March 31, 2017, to toll the statute of limitations for approximately 50 additional claims. The Company intends to continue defending against these lawsuits.

Propecia/Proscar

As previously disclosed, Merck is a defendant in product liability lawsuits in the United States involving Propecia and/or Proscar. As of March 31, 2017, approximately 1,260 lawsuits have been filed by plaintiffs who allege that they have experienced persistent sexual side effects following cessation of treatment with Propecia and/or Proscar. Approximately 50 of the plaintiffs also allege that Propecia or Proscar has caused or can cause prostate cancer, testicular cancer or male breast cancer. The lawsuits have been filed in various federal courts and in state court in New Jersey. The federal lawsuits have been consolidated for pretrial purposes in a federal multidistrict litigation before Judge Brian Cogan of the Eastern District of New York. The matters pending in state court in New Jersey have been consolidated before Judge Mayer in Middlesex County. In addition, there is one matter pending in state court in California and one matter pending in state court in Ohio. The Company intends to defend against these lawsuits.

Commercial and Other Litigation

K-DUR Antitrust Litigation

In June 1997 and January 1998, Schering-Plough Corporation (Schering-Plough) settled patent litigation with Upsher-Smith, Inc. (Upsher-Smith) and ESI Lederle, Inc. (Lederle), respectively, relating to generic versions of Schering-Plough’s long-acting potassium chloride product supplement used by cardiac patients, for which Lederle and Upsher-Smith had filed Abbreviated New Drug Applications (ANDAs). Following the commencement of an administrative proceeding by the U.S. Federal Trade Commission in 2001 alleging anti-competitive effects from those settlements (which was resolved in Schering-Plough’s favor), putative class and non-class action suits were filed on behalf of direct and indirect purchasers of K‑DUR against Schering-Plough, Upsher-Smith and Lederle and were consolidated in a multidistrict litigation in the U.S. District Court for the District of New Jersey. These suits claimed violations of federal and state antitrust laws, as well as other state statutory and common law causes of action, and sought unspecified damages. In April 2008, the indirect purchasers voluntarily dismissed their case. In February 2016, the District Court denied the Company’s motion for summary judgment relating to all of the direct purchasers’ claims concerning the settlement with Upsher-Smith and granted the Company’s motion for summary judgment relating to all of the direct purchasers’ claims concerning the settlement with Lederle. In anticipation of trial, the parties filed motions to exclude certain expert opinions and other evidence, and defendants filed a motion for summary judgment.

As previously disclosed, in February 2017, Merck and Upsher-Smith reached a settlement in principle with the class of direct purchasers and the opt-outs to the class. Merck will contribute approximately $80 million in the aggregate towards the overall settlement. On April 5, 2017, the claims of the opt-outs were dismissed with prejudice pursuant to a written settlement agreement with those parties. Merck and Upsher-Smith are working with the class of direct purchasers on a definitive settlement agreement of its claims, which will be subject to approval by the District Court.

Merck KGaA Litigation

In January 2016, to protect its long-established brand rights in the United States, the Company filed a lawsuit against Merck KGaA, Darmstadt, Germany (KGaA), operating as the EMD Group in the United States, alleging it improperly uses the name “Merck” in the United States. KGaA has filed suit against the Company in France, the United Kingdom (UK), Germany, Switzerland, Mexico, and India alleging breach of the parties’ co-existence agreement, unfair competition and/or trademark infringement. In December 2015, the Paris Court of First Instance issued a judgment finding that certain activities by the Company directed towards France did not constitute trademark infringement and unfair competition while other activities were found to infringe. The Company and KGaA have both appealed the decision, and the appeal is scheduled to be heard in May 2017. In January 2016, the UK High Court issued a judgment finding that the Company had breached the co-existence agreement and infringed KGaA’s trademark rights as a result of certain activities directed towards the UK based on use of the word MERCK on promotional and information activity. As noted in the UK decision, this finding was not based on the Company’s use of the sign MERCK in connection with the sale of products or any material pharmaceutical business transacted in the UK. The Company and KGaA have both appealed this decision, and the appeal is scheduled to be heard in June 2017.

Patent Litigation

From time to time, generic manufacturers of pharmaceutical products file ANDAs with the U.S. Food and Drug Administration (FDA) seeking to market generic forms of the Company’s products prior to the expiration of relevant patents owned by the Company. To protect its patent rights, the Company may file patent infringement lawsuits against such generic companies. Certain products of the Company (or products marketed via agreements with other companies) currently involved in such patent infringement litigation in the United States include: Invanz, Nasonex, Noxafil, and NuvaRing. Similar lawsuits defending the Company’s patent rights may exist in other countries. The Company intends to vigorously defend its patents, which it believes are valid, against infringement by companies attempting to market products prior to the expiration of such patents. As with any litigation, there can be no assurance of the outcomes, which, if adverse, could result in significantly shortened periods of exclusivity for these products and, with respect to products acquired through acquisitions, potentially significant intangible asset impairment charges.

Invanz — In July 2014, a patent infringement lawsuit was filed in the United States against Hospira, Inc. (Hospira) in respect of Hospira’s application to the FDA seeking pre-patent expiry approval to market a generic version of Invanz. The trial in this matter was held in April 2016 and, in October 2016, the district court ruled that the patent is valid and infringed. In August 2015, a patent infringement lawsuit was filed in the United States against Savior Lifetec Corporation (Savior) in respect of Savior’s application to the FDA seeking pre-patent expiry approval to market a generic version of Invanz. The lawsuit automatically stays FDA approval of Savior’s application until November 2017 or until an adverse court decision, if any, whichever may occur earlier.

Nasonex — In July 2014, a patent infringement lawsuit was filed in the United States against Teva Pharmaceuticals USA, Inc. (Teva Pharma) in respect of Teva Pharma’s application to the FDA seeking pre-patent expiry approval to market a generic version of Nasonex. The trial in this matter was held in June 2016. In November 2016, the district court ruled that the patent was valid but not infringed. In March 2017, the parties reached a settlement whereby Teva Pharma can launch its generic version in September 2017, or earlier under certain conditions.

In March 2015, a patent infringement lawsuit was filed in the United States against Amneal Pharmaceuticals LLC (Amneal) in respect of Amneal’s application to the FDA seeking pre-patent expiry approval to market a generic version of Nasonex. The trial in this matter was held in June 2016. In January 2017, the district court ruled that the patent was valid but not infringed. The Company has appealed this decision.

A previous decision, issued in June 2013, held that the Merck patent in the Teva Pharma and Amneal lawsuits covering mometasone furoate monohydrate was valid, but that it was not infringed by Apotex Corp.’s proposed product. In April 2015, a patent infringement lawsuit was filed against Apotex Inc. and Apotex Corp. (Apotex) in respect of Apotex’s now-launched product that the Company believes differs from the generic version in the previous lawsuit.

Noxafil —In August 2015, the Company filed a lawsuit against Actavis Laboratories Fl, Inc. (Actavis) in the United States in respect of that company’s application to the FDA seeking pre-patent expiry approval to sell a generic version of Noxafil. The lawsuit automatically stays FDA approval of Actavis’s application until December 2017 or until an adverse court decision, if any, whichever may occur earlier. The trial in this matter is currently scheduled to begin in July 2017. In March 2016, the Company filed a lawsuit against Roxane Laboratories, Inc. (Roxane) in the United States in respect of that company’s application to the FDA seeking pre-patent expiry approval to sell a generic version of Noxafil. The lawsuit automatically stays FDA approval of Roxane’s application until August 2018 or until an adverse court decision, if any, whichever may occur earlier. In February 2016, the Company filed a lawsuit against Par Sterile Products LLC, Par Pharmaceutical, Inc., Par Pharmaceutical Companies, Inc. and Par Pharmaceutical Holdings, Inc. (collectively, Par) in the United States in respect of that company’s application to the FDA seeking pre-patent expiry approval to sell a generic version of Noxafil. In October 2016, the parties reached a settlement whereby Par can launch its generic version in January 2023, or earlier under certain conditions.

NuvaRing — In December 2013, the Company filed a lawsuit against a subsidiary of Allergan plc in the United States in respect of that company’s application to the FDA seeking pre-patent expiry approval to sell a generic version of NuvaRing. The trial in this matter was held in January 2016. In August 2016, the district court ruled that the patent was invalid and the Company has appealed this decision. In September 2015, the Company filed a lawsuit against Teva Pharma in the United States in respect of that company’s application to the FDA seeking pre-patent expiry approval to sell a generic version of NuvaRing. Based on its ruling in the Allergan plc matter, the district court dismissed the Company’s lawsuit in December 2016. The Company has appealed this decision.

Anti-PD-1 Antibody Patent Oppositions and Litigation

As previously disclosed, Ono Pharmaceutical Co. (Ono) has a European patent (EP 1 537 878) (’878) that broadly claims the use of an anti-PD-1 antibody, such as the Company’s immunotherapy, Keytruda, for the treatment of cancer. Ono has previously licensed its commercial rights to an anti-PD-1 antibody to Bristol-Myers Squibb (BMS) in certain markets. BMS and Ono also own European Patent EP 2 161 336 (’336) that, as granted, broadly claimed anti-PD-1 antibodies that could include Keytruda.

As previously disclosed, the Company and BMS and Ono were engaged in worldwide litigation, including in the United States, over the validity and infringement of the ’878 patent, the ’336 patent and their equivalents.

In January 2017, the Company announced that it had entered into a settlement and license agreement with BMS and Ono resolving the worldwide patent infringement litigation related to the use of an anti-PD-1 antibody for the treatment of cancer, such as Keytruda. Under the settlement and license agreement, the Company made a one-time payment of $625 million (which was recorded as an expense in the Company’s 2016 financial results) to BMS and will pay royalties on the worldwide sales of Keytruda for a non-exclusive license to market Keytruda in any market in which it is approved. For global net sales of Keytruda, the Company will pay royalties as follows:

•6.5% of net sales occurring from January 1, 2017 through and including December 31, 2023; and

•2.5% of net sales occurring from January 1, 2024 through and including December 31, 2026.

The parties also agreed to dismiss all claims worldwide in the relevant legal proceedings.

In October 2015, PDL Biopharma (PDL) filed a lawsuit in the United States against the Company alleging that the manufacture of Keytruda infringed US Patent No. 5,693,761 (’761 patent), which expired in December 2014. This patent claims platform technology used in the creation and manufacture of recombinant antibodies and PDL is seeking damages for pre-expiry infringement of the ’761 patent. In April 2017, the parties reached a settlement pursuant to which, in exchange for a lump sum, PDL dismissed its lawsuit with prejudice and granted the Company a fully paid-up non-exclusive license to the ’761 patent.

In July 2016, the Company filed a declaratory judgment action in the United States against Genentech and City of Hope seeking a ruling that US Patent No. 7,923,221 (the Cabilly III patent), which claims platform technology used in the creation and manufacture of recombinant antibodies, is invalid and that Keytruda and bezlotoxumab do not infringe the Cabilly III patent. In July 2016, the Company also filed a petition in the USPTO for Inter Partes Review (IPR) of certain claims of US Patent No. 6,331,415 (the Cabilly II patent), which claims platform technology used in the creation and manufacture of recombinant antibodies and is also owned by Genentech and City of Hope, as being invalid. In December 2016, the USPTO denied the petition but allowed the Company to join an IPR filed previously by another party. In May 2017, the parties reached a settlement pursuant to which the Company dismissed its lawsuit with prejudice and moved to terminate the IPR and Genentech and City of Hope granted the Company a fully paid-up non-exclusive license to the Cabilly II and Cabilly III patents.

Gilead Patent Litigation and Opposition

In August 2013, Gilead Sciences, Inc. (Gilead) filed a lawsuit in the U.S. District Court for the Northern District of California seeking a declaration that two Company patents were invalid and not infringed by the sale of their two sofosbuvir containing products, Solvadi and Harvoni. The Company filed a counterclaim that the sale of these products did infringe these two patents and sought a reasonable royalty for the past, present and future sales of these products. In March 2016, at the conclusion of a jury trial, the patents were found to be not invalid and infringed. The jury awarded the Company $200 million as a royalty for sales of these products up to December 2015. After the conclusion of the jury trial, the court held a bench trial on the equitable defenses raised by Gilead. In June 2016, the court found for Gilead and determined that Merck could not collect the jury award and that the patents were unenforceable with respect to Gilead. The Company has appealed the court’s decision. Gilead has also asked the court to overturn the jury’s decision on validity. The court held a hearing on Gilead’s motion in August 2016, and the court subsequently rejected Gilead’s request. The Company will pay 20%, net of legal fees, of damages or royalties, if any, that it receives to Ionis Pharmaceuticals, Inc.

The Company, through its Idenix Pharmaceuticals, Inc. subsidiary, has pending litigation against Gilead in the United States, the UK, Norway, Canada, Germany, France, and Australia based on different patent estates that would also be infringed by Gilead’s sales of these two products. Gilead has opposed the European patent at the European Patent Office (EPO). Trial in the United States was held in December 2016 and the jury returned a verdict for the Company, awarding damages of $2.54 billion. The Company is currently briefing post-trial motions, including on the issues of enhanced damages and future royalties. Gilead is briefing post-trial motions for judgment as a matter of law. In Australia and Canada, the Company was initially unsuccessful and those cases are currently under appeal. In the UK and Norway, the patent was held invalid and no further appeal was filed. The EPO opposition division revoked the European patent, and the Company has appealed this decision. The cases in France and Germany have been stayed pending the final decision of the EPO.

Other Litigation

There are various other pending legal proceedings involving the Company, principally product liability and intellectual property lawsuits. While it is not feasible to predict the outcome of such proceedings, in the opinion of the Company, either the likelihood of loss is remote or any reasonably possible loss associated with the resolution of such proceedings is not expected to be material to the Company’s financial position, results of operations or cash flows either individually or in the aggregate.

Legal Defense Reserves

Legal defense costs expected to be incurred in connection with a loss contingency are accrued when probable and reasonably estimable. Some of the significant factors considered in the review of these legal defense reserves are as follows: the actual costs incurred by the Company; the development of the Company’s legal defense strategy and structure in light of the scope of its litigation; the number of cases being brought against the Company; the costs and outcomes of completed trials and the most current information regarding anticipated timing, progression, and related costs of pre-trial activities and trials in the associated litigation. The amount of legal defense reserves as of March 31, 2017 and December 31, 2016 of approximately $175 million and $185 million, respectively, represents the Company’s best estimate of the minimum amount of defense costs to be incurred in connection with its outstanding litigation; however, events such as additional trials and other events that could arise in the course of its litigation could affect the ultimate amount of legal defense costs to be incurred by the Company. The Company will continue to monitor its legal defense costs and review the adequacy of the associated reserves and may determine to increase the reserves at any time in the future if, based upon the factors set forth, it believes it would be appropriate to do so.

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Equity

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Equity

Equity

	Common Stock			Other Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock					Non- Controlling Interests			Total
($ and shares in millions)	Shares	Par Value											Shares		Cost
Balance at January 1, 2016	3,577	$	1,788	$	40,222		$	45,348		$	(4,148	)	796		$	(38,534	)	$	91		$	44,767
Net income attributable to Merck & Co., Inc.	—	—		—			1,125			—			—		—			—			1,125
Other comprehensive loss, net of tax	—	—		—			—			(46		)	—		—			—			(46		)
Cash dividends declared on common stock	—	—		—			(1,281		)	—			—		—			—			(1,281		)
Treasury stock shares purchased	—	—		—			—			—			18		(913		)	—			(913		)
Share-based compensation plans and other	—	—		(77		)	—			—			(6	)	322			—			245
Net income attributable to noncontrolling interests	—	—		—			—			—			—		—			5			5
Distributions attributable to noncontrolling interests	—	—		—			—			—			—		—			(1		)	(1		)
Balance at March 31, 2016	3,577	$	1,788	$	40,145		$	45,192		$	(4,194	)	808		$	(39,125	)	$	95		$	43,901
Balance at January 1, 2017	3,577	$	1,788	$	39,939		$	44,133		$	(5,226	)	828		$	(40,546	)	$	220		$	40,308
Net income attributable to Merck & Co., Inc.	—	—		—			1,551			—			—		—			—			1,551
Other comprehensive income, net of tax	—	—		—			—			146			—		—			—			146
Cash dividends declared on common stock	—	—		—			(1,297		)	—			—		—			—			(1,297		)
Treasury stock shares purchased	—	—		—			—			—			16		(1,019		)	—			(1,019		)
Share-based compensation plans and other	—	—		(40		)	—			—			(7	)	408			—			368
Acquisition of Vallée	—	—		—			—			—			—		—			25			25
Net income attributable to noncontrolling interests	—	—		—			—			—			—		—			5			5
Other changes in noncontrolling ownership interests	—	—		—			—			—			—		—			1			1
Balance at March 31, 2017	3,577	$	1,788	$	39,899		$	44,387		$	(5,080	)	837		$	(41,157	)	$	251		$	40,088

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Share-Based Compensation Plans

3 Months Ended

Mar. 31, 2017

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

Share-Based Compensation Plans

Share-Based Compensation Plans

The Company has share-based compensation plans under which the Company grants restricted stock units (RSUs) and performance share units (PSUs) to certain management level employees. In addition, employees and non-employee directors may be granted options to purchase shares of Company common stock at the fair market value at the time of grant.

The following table provides the amounts of share-based compensation cost recorded in the Condensed Consolidated Statement of Income:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Pretax share-based compensation expense	$	74		$	68
Income tax benefit	(22		)	(20		)
Total share-based compensation expense, net of taxes	$	52		$	48

During the first three months of 2017 and 2016, the Company granted 86 thousand RSUs with a weighted-average grant date fair value of $64.20 per RSU and 133 thousand RSUs with a weighted-average grant date fair value of $48.83 per RSU, respectively. During the first three months of 2017 and 2016, the Company granted 190 thousand stock options with a weighted-average exercise price of $64.20 per option and 74 thousand stock options with a weighted-average exercise price of $48.83 per option, respectively. The weighted-average fair value of options granted for the first three months of 2017 and 2016 was $7.89 and $5.76 per option, respectively, and was determined using the following assumptions:

	Three Months Ended March 31,
	2017		2016
Expected dividend yield	3.7	%	3.8	%
Risk-free interest rate	2.0	%	1.3	%
Expected volatility	19.7	%	21.0	%
Expected life (years)	6.2		6.2

At March 31, 2017, there was $681 million of total pretax unrecognized compensation expense related to nonvested stock options, RSU and PSU awards which will be recognized over a weighted-average period of 2.4 years. The Company typically communicates the value of annual share-based compensation awards to employees during the first quarter, but the related share amounts are not established and communicated until early May. Therefore, while the number of RSU and stock option grants disclosed above do not reflect any amounts relating to the annual grants, share-based compensation costs for the first quarter of 2017 and 2016 and unrecognized compensation expense at March 31, 2017 reflect an impact relating to the awards communicated to employees. For segment reporting, share-based compensation costs are unallocated expenses.

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Pension and Other Postretirement Benefit Plans

3 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Pension and Other Postretirement Benefit Plans

Pension and Other Postretirement Benefit Plans

The Company has defined benefit pension plans covering eligible employees in the United States and in certain of its international subsidiaries. The net periodic benefit cost (credit) of such plans consisted of the following components:

	Three Months Ended   March 31,
	2017						2016
($ in millions)	U.S.			International			U.S.			International
Service cost	$	77		$	61		$	73		$	58
Interest cost	113			41			113			52
Expected return on plan assets	(218		)	(94		)	(210		)	(95		)
Amortization of unrecognized prior service credit	(13		)	(2		)	(14		)	(3		)
Net loss amortization	44			23			29			22
Termination benefits	5			1			4			—
Curtailments	3			—			—			1
	$	11		$	30		$	(5	)	$	35

The Company provides medical benefits, principally to its eligible U.S. retirees and similar benefits to their dependents, through its other postretirement benefit plans. The net cost (credit) of such plans consisted of the following components:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Service cost	$	14		$	13
Interest cost	20			21
Expected return on plan assets	(19		)	(35		)
Amortization of unrecognized prior service credit	(25		)	(26		)
Termination benefits	1			1
Curtailments	(3		)	(1		)
	$	(12	)	$	(27	)

In connection with restructuring actions (see Note 3), termination charges were recorded on pension and other postretirement benefit plans related to expanded eligibility for certain employees exiting Merck. Also, in connection with these restructuring actions, curtailments were recorded on pension and other postretirement benefit plans as reflected in the tables above.

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Other (Income) Expense, Net

3 Months Ended

Mar. 31, 2017

Other Income and Expenses [Abstract]

Other (Income) Expense, Net

Other (Income) Expense, Net

Other (income) expense, net, consisted of:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Interest income	$	(97	)	$	(79	)
Interest expense	182			172
Exchange (gains) losses	(8		)	38
Equity loss (income) from affiliates	13			(34		)
Other, net	(32		)	(49		)
	$	58		$	48

The change in equity loss (income) from affiliates in the first quarter of 2017 as compared with the first quarter of 2016 was driven primarily by certain research investment funds, which generated equity losses in the first quarter of 2017 compared with equity income in the first quarter of 2016, as well as by the termination of the SPMSD joint venture on December 31, 2016.

Interest paid for the three months ended March 31, 2017 and 2016 was $162 million and $160 million, respectively.

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Taxes on Income

3 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Taxes on Income

Taxes on Income

The effective income tax rates of 22.3% and 30.4% for the first quarter of 2017 and 2016, respectively, reflect the impacts of acquisition and divestiture-related costs and restructuring costs, partially offset by the beneficial impact of foreign earnings.

The Company is under examination by numerous tax authorities in various jurisdictions globally. The ultimate finalization of the Company’s examinations with relevant taxing authorities can include formal administrative and legal proceedings, which could have a significant impact on the timing of the reversal of unrecognized tax benefits. The Company believes that its reserves for uncertain tax positions are adequate to cover existing risks or exposures. However, there is one item that is currently under discussion with the Internal Revenue Service relating to the 2006 through 2008 examination. The Company has concluded that its position should be sustained upon audit. However, if this item were to result in an unfavorable outcome or settlement, it could have a material adverse impact on the Company’s financial position, liquidity and results of operations.

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Earnings Per Share

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

The calculations of earnings per share are as follows:

	Three Months Ended   March 31,
($ and shares in millions except per share amounts)	2017		2016
Net income attributable to Merck & Co., Inc.	$	1,551	$	1,125
Average common shares outstanding	2,745		2,774
Common shares issuable (1)	21		21
Average common shares outstanding assuming dilution	2,766		2,795
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders	$	0.56	$	0.41
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders	$	0.56	$	0.40

⁽¹⁾  Issuable primarily under share-based compensation plans.

For the three months ended March 31, 2017 and 2016, 2 million and 10 million, respectively, of common shares issuable under share-based compensation plans were excluded from the computation of earnings per common share assuming dilution because the effect would have been antidilutive.

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Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Other Comprehensive Income (Loss)

Other Comprehensive Income (Loss)

Changes in AOCI by component are as follows:

	Three Months Ended March 31,
($ in millions)	Derivatives				Investments				Employee Benefit Plans				Cumulative Translation Adjustment			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2016, net of taxes	$	404			$	41			$	(2,407	)		$	(2,186	)	$	(4,148	)
Other comprehensive income (loss) before reclassification adjustments, pretax	(167		)		54				(35		)		99			(49		)
Tax	58				16				(1		)		22			95
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(109		)		70				(36		)		121			46
Reclassification adjustments, pretax	(143		)	(1)	(11		)	(2)	7			(3)	—			(147		)
Tax	50				4				1				—			55
Reclassification adjustments, net of taxes	(93		)		(7		)		8				—			(92		)
Other comprehensive income (loss), net of taxes	(202		)		63				(28		)		121			(46		)
Balance March 31, 2016, net of taxes	$	202			$	104			$	(2,435	)		$	(2,065	)	$	(4,194	)
Balance January 1, 2017, net of taxes	$	338			$	(3	)		$	(3,206	)		$	(2,355	)	$	(5,226	)
Other comprehensive income (loss) before reclassification adjustments, pretax	(263		)		87				(4		)		263			83
Tax	92				(7		)		9				46			140
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(171		)		80				5				309			223
Reclassification adjustments, pretax	(95		)	(1)	(57		)	(2)	28			(3)	—			(124		)
Tax	34				20				(7		)		—			47
Reclassification adjustments, net of taxes	(61		)		(37		)		21				—			(77		)
Other comprehensive income (loss), net of taxes	(232		)		43				26				309			146
Balance March 31, 2017, net of taxes	$	106			$	40			$	(3,180	)		$	(2,046	)	$	(5,080	)

⁽¹⁾  Relates to foreign currency cash flow hedges that were reclassified from AOCI to Sales.

⁽²⁾  Represents net realized (gains) losses on the sales of available-for-sale investments that were reclassified from AOCI to Other (income) expense, net.

⁽³⁾  Includes net amortization of prior service cost and actuarial gains and losses included in net periodic benefit cost (see Note 10).

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Segment Reporting

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Segment Reporting

Segment Reporting

The Company’s operations are principally managed on a products basis and include the Pharmaceutical, Animal Health, Healthcare Services and Alliances operating segments. The Animal Health, Healthcare Services and Alliances segments are not material for separate reporting.

The Pharmaceutical segment includes human health pharmaceutical and vaccine products. Human health pharmaceutical products consist of therapeutic and preventive agents, generally sold by prescription, for the treatment of human disorders. The Company sells these human health pharmaceutical products primarily to drug wholesalers and retailers, hospitals, government agencies and managed health care providers such as health maintenance organizations, pharmacy benefit managers and other institutions. Vaccine products consist of preventive pediatric, adolescent and adult vaccines, primarily administered at physician offices. The Company sells these human health vaccines primarily to physicians, wholesalers, physician distributors and government entities. A large component of pediatric and adolescent vaccine sales are made to the U.S. Centers for Disease Control and Prevention Vaccines for Children program, which is funded by the U.S. government. Additionally, the Company sells vaccines to the Federal government for placement into vaccine stockpiles. Sales of vaccines in most major European markets were marketed through the Company’s SPMSD joint venture until its termination on December 31, 2016.

The Company also has animal health operations that discover, develop, manufacture and market animal health products, including vaccines, which the Company sells to veterinarians, distributors and animal producers. The Company’s Healthcare Services segment provides services and solutions that focus on engagement, health analytics and clinical services to improve the value of care delivered to patients.

Sales of the Company’s products were as follows:

	Three Months Ended   March 31,
($ in millions)	2017		2016
Primary Care and Women’s Health
Cardiovascular
Zetia	$	334	$	612
Vytorin	241		277
Liptruzet	49		23
Adempas	84		33
Diabetes
Januvia	839		906
Janumet	496		506
General Medicine and Women’s Health
Implanon/Nexplanon	170		134
NuvaRing	160		175
Follistim AQ	81		94
Hospital and Specialty
Hepatitis
Zepatier	378		50
HIV
Isentress	305		340
Hospital Acute Care
Bridion	148		90
Noxafil	141		145
Invanz	136		114
Cancidas	121		133
Cubicin	96		292
Primaxin	62		73
Immunology
Remicade	229		349
Simponi	184		188
Oncology
Keytruda	584		249
Emend	133		126
Temodar	66		66
Diversified Brands
Respiratory
Singulair	186		237
Nasonex	139		229
Dulera	82		113
Other
Cozaar/Hyzaar	112		126
Arcoxia	103		111
Fosamax	61		75
Vaccines (1)
Gardasil/Gardasil 9	532		378
ProQuad/M-M-R II/Varivax	355		357
RotaTeq	224		188
Pneumovax 23	163		107
Zostavax	154		125
Other pharmaceutical (2)	1,037		1,083
Total Pharmaceutical segment sales	8,185		8,104
Other segment sales (3)	1,033		905
Total segment sales	9,218		9,009
Other (4)	216		303
	$	9,434	$	9,312

⁽¹⁾  On December 31, 2016, Merck and Sanofi Pasteur terminated their equally-owned joint venture, SPMSD, which marketed vaccines in most major European markets. Accordingly, vaccine sales in 2017 include sales in the European markets that were previously part of SPMSD. Amounts for 2016 do not include sales of vaccines sold through SPMSD, the results of which are reflected inequity income from affiliates which is included in Other (income) expense, net. Amounts for 2016 do, however, include supply sales to SPMSD.

⁽²⁾  Other pharmaceutical primarily reflects sales of other human health pharmaceutical products, including products within the franchises not listed separately.

⁽³⁾  Represents the non-reportable segments of Animal Health, Healthcare Services and Alliances.

⁽⁴⁾  Other is primarily comprised of miscellaneous corporate revenues, including revenue hedging activities, as well as third-party manufacturing sales. Other in the first quarter of 2017 and 2016 also includes $50 million and $75 million, respectively, related to the sale of the marketing rights to certain products.

A reconciliation of segment profits to Income before taxes is as follows:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Segment profits:
Pharmaceutical segment	$	5,180		$	5,117
Other segments	452			355
Total segment profits	5,632			5,472
Other profits	142			227
Unallocated:
Interest income	97			79
Interest expense	(182		)	(172		)
Equity income from affiliates	(12		)	20
Depreciation and amortization	(370		)	(428		)
Research and development	(1,599		)	(1,373		)
Amortization of purchase accounting adjustments	(778		)	(1,133		)
Restructuring costs	(151		)	(91		)
Other unallocated, net	(776		)	(977		)
	$	2,003		$	1,624

Segment profits are comprised of segment sales less standard costs and certain operating expenses directly incurred by the segments. For internal management reporting presented to the chief operating decision maker, Merck does not allocate materials and production costs, other than standard costs, the majority of research and development expenses or general and administrative expenses, nor the cost of financing these activities. Separate divisions maintain responsibility for monitoring and managing these costs, including depreciation related to fixed assets utilized by these divisions and, therefore, they are not included in segment profits. In addition, costs related to restructuring activities, as well as the amortization of purchase accounting adjustments are not allocated to segments.

Other profits are primarily comprised of miscellaneous corporate profits, as well as operating profits related to third-party manufacturing sales.

Other unallocated, net includes expenses from corporate and manufacturing cost centers, goodwill and intangible asset impairment charges, gains or losses on sales of businesses, expense or income related to changes in the estimated fair value of contingent consideration, and other miscellaneous income or expense items.

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Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Recently Issued Accounting Standards

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (FASB) issued amended accounting guidance on revenue recognition that will be applied to all contracts with customers. The objective of the new guidance is to improve comparability of revenue recognition practices across entities and to provide more useful information to users of financial statements through improved disclosure requirements. In August 2015, the FASB approved a one-year deferral of the effective date making this guidance effective for interim and annual periods beginning in 2018. The new standard permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of adopting the guidance being recognized at the date of initial application (modified retrospective method). The Company will adopt the new standard on January 1, 2018 and currently plans to use the modified retrospective method. The majority of the Company’s business is ship and bill and, on that primary revenue stream, Merck does not expect significant differences. However, the Company’s analysis is preliminary and subject to change. Merck has not completed its assessment of multiple element arrangements and certain discount and trade promotion programs.

In January 2016, the FASB issued revised guidance for the accounting and reporting of financial instruments. The new guidance requires that equity investments with readily determinable fair values currently classified as available-for-sale be measured at fair value with changes in fair value recognized in net income. The new guidance also simplifies the impairment testing of equity investments without readily determinable fair values and changes certain disclosure requirements. This guidance is effective for interim and annual periods beginning in 2018. Early adoption is not permitted. The Company is currently assessing the impact of adoption on its consolidated financial statements.

In August 2016, the FASB issued guidance on the classification of certain cash receipts and payments in the statement of cash flows intended to reduce diversity in practice. The guidance is effective for interim and annual periods beginning in 2018. Early adoption is permitted. The guidance is to be applied retrospectively to all periods presented but may be applied prospectively if retrospective application would be impracticable. The Company is currently evaluating the effect of the standard on its Consolidated Statement of Cash Flows.

In October 2016, the FASB issued guidance on the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. Under existing guidance, the recognition of current and deferred income taxes for an intra-entity asset transfer is prohibited until the asset has been sold to a third party. The new guidance will require the recognition of the income tax consequences of an intra-entity transfer of an asset (with the exception of inventory) when the intra-entity transfer occurs. The guidance is effective for interim and annual periods beginning in 2018. Early adoption is permitted. The new guidance is to be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings in the beginning of the period of adoption. The Company does not anticipate the adoption of the new guidance will have a material effect on its consolidated financial statements.

In November 2016, the FASB issued guidance requiring that amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The guidance is effective for interim and annual periods beginning in 2018 and should be applied using a retrospective transition method to each period presented. Early adoption is permitted. The Company is currently evaluating the effect of the standard on its Consolidated Statement of Cash Flows.

In March 2017, the FASB amended the guidance related to net periodic benefit cost for defined benefit plans that requires entities to (1) disaggregate the current service cost component from the other components of net benefit cost and present it with other employee compensation costs in the income statement within operations if such a subtotal is presented; (2) present the other components of net benefit cost separately in the income statement and outside of income from operations; and (3) only capitalize the service cost component when applicable. The new guidance is effective for interim and annual periods in 2018. Entities must use a retrospective transition method to adopt the requirement for separate presentation in the income statement of service costs and other components and a prospective transition method to adopt the requirement to limit the capitalization of benefit costs to the service cost component. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In February 2016, the FASB issued new accounting guidance for the accounting and reporting of leases. The new guidance requires that lessees recognize a right-of-use asset and a lease liability recorded on the balance sheet for each of its leases (other than leases that meet the definition of a short-term lease).  Leases will be classified as either operating or finance. Operating leases will result in straight-line expense in the income statement (similar to current operating leases) while finance leases will result in more expense being recognized in the earlier years of the lease term (similar to current capital leases). The new guidance will be effective for interim and annual periods beginning in 2019. Early adoption is permitted. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In June 2016, the FASB issued amended guidance on the accounting for credit losses on financial instruments within its scope. The guidance introduces an expected loss model for estimating credit losses, replacing the incurred loss model. The new guidance also changes the impairment model for available-for-sale debt securities, requiring the use of an allowance to record estimated credit losses (and subsequent recoveries). The new guidance is effective for interim and annual periods beginning in 2020, with earlier application permitted in 2019. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In January 2017, the FASB issued guidance that provides for the elimination of Step 2 from the goodwill impairment test. If impairment charges are recognized, the amount recorded will be the amount by which the carrying amount exceeds the reporting unit’s fair value with certain limitations. The new guidance is effective for interim and annual periods in 2020. Early adoption is permitted. The Company does not anticipate the adoption of the new guidance will have a material effect on its consolidated financial statements.

Legal defense costs

Legal defense costs expected to be incurred in connection with a loss contingency are accrued when probable and reasonably estimable.

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Restructuring (Tables)

3 Months Ended

Mar. 31, 2017

Restructuring and Related Activities [Abstract]

Charges Related to Restructuring Program Activities by Type of Cost

The following tables summarize the charges related to restructuring program activities by type of cost:

	Three Months Ended March 31, 2017
($ in millions)	Separation Costs		Accelerated Depreciation			Other		Total
Materials and production	$	—	$	51		$	12	$	63
Marketing and administrative	—		—			1		1
Research and development	—		(2		)	2		—
Restructuring costs	84		—			67		151
	$	84	$	49		$	82	$	215

	Three Months Ended March 31, 2016
($ in millions)	Separation Costs		Accelerated Depreciation		Other		Total
Materials and production	$	—	$	22	$	25	$	47
Marketing and administrative	—		3		—		3
Research and development	—		55		—		55
Restructuring costs	26		—		65		91
	$	26	$	80	$	90	$	196

Charges and Spending Relating to Restructuring Activities by Program

The following table summarizes the charges and spending relating to restructuring program activities for the three months ended March 31, 2017:

($ in millions)	Separation Costs			Accelerated Depreciation			Other			Total
Restructuring reserves January 1, 2017	$	395		$	—		$	146		$	541
Expense	84			49			82			215
(Payments) receipts, net	(103		)	—			(118		)	(221		)
Non-cash activity	—			(49		)	27			(22		)
Restructuring reserves March 31, 2017 (1)	$	376		$	—		$	137		$	513

⁽¹⁾  The remaining cash outlays are expected to be substantially completed by the end of 2017.

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Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Interest Rate Swaps Held

At March 31, 2017, the Company was a party to 26 pay-floating, receive-fixed interest rate swap contracts designated as fair value hedges of fixed-rate notes in which the notional amounts match the amount of the hedged fixed-rate notes as detailed in the table below.

($ in millions)	March 31, 2017
Debt Instrument	Par Value of Debt		Number of Interest Rate Swaps Held	Total Swap Notional Amount
1.30% notes due 2018	$	1,000	4	$	1,000
5.00% notes due 2019	1,250		3	550
1.85% notes due 2020	1,250		5	1,250
3.875% notes due 2021	1,150		5	1,150
2.40% notes due 2022	1,000		4	1,000
2.35% notes due 2022	1,250		5	1,250

Fair Value of Derivatives on a Gross Basis Segregated between those Derivatives that are Designated as Hedging Instruments and those that are Not Designated as Hedging Instruments

Presented in the table below is the fair value of derivatives on a gross basis segregated between those derivatives that are designated as hedging instruments and those that are not designated as hedging instruments:

		March 31, 2017						December 31, 2016
		Fair Value of Derivative				U.S. Dollar Notional		Fair Value of Derivative				U.S. Dollar Notional
($ in millions)	Balance Sheet Caption	Asset		Liability				Asset		Liability
Derivatives Designated as Hedging Instruments
Interest rate swap contracts	Other assets	$	11	$	—	$	2,700	$	20	$	—	$	2,700
Interest rate swap contracts	Other noncurrent liabilities	—		35		3,500		—		29		3,500
Foreign exchange contracts	Other current assets	330		—		5,049		616		—		6,063
Foreign exchange contracts	Other assets	56		—		1,815		129		—		2,075
Foreign exchange contracts	Accrued and other current liabilities	—		21		915		—		1		48
Foreign exchange contracts	Other noncurrent liabilities	—		1		20		—		1		12
		$	397	$	57	$	13,999	$	765	$	31	$	14,398
Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts	Other current assets	$	232	$	—	$	8,037	$	230	$	—	$	8,210
Foreign exchange contracts	Accrued and other current liabilities	—		89		6,479		—		103		2,931
		$	232	$	89	$	14,516	$	230	$	103	$	11,141
		$	629	$	146	$	28,515	$	995	$	134	$	25,539

Information on Derivative Positions Subject to Master Netting Arrangements as if they were Presented on a Net Basis

The following table provides information on the Company’s derivative positions subject to these master netting arrangements as if they were presented on a net basis, allowing for the right of offset by counterparty and cash collateral exchanged per the master agreements and related credit support annexes:

	March 31, 2017						December 31, 2016
($ in millions)	Asset			Liability			Asset			Liability
Gross amounts recognized in the consolidated balance sheet	$	629		$	146		$	995		$	134
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet	(144		)	(144		)	(131		)	(131		)
Cash collateral received	(222		)	—			(529		)	—
Net amounts	$	263		$	2		$	335		$	3

Location and Pretax Gain or Loss Amounts for Derivatives

The table below provides information on the location and pretax gain or loss amounts for derivatives that are: (i) designated in a fair value hedging relationship, (ii) designated in a foreign currency cash flow hedging relationship and (iii) not designated in a hedging relationship:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Derivatives designated in a fair value hedging relationship
Interest rate swap contracts
Amount of loss (gain) recognized in Other (income) expense, net on derivatives (1)	$	15		$	(150	)
Amount of (gain) loss recognized in Other (income) expense, net on hedged item (1)	(16		)	147
Derivatives designated in foreign currency cash flow hedging relationships
Foreign exchange contracts
Amount of gain reclassified from AOCI to Sales	(94		)	(143		)
Amount of loss recognized in OCI on derivatives	263			167
Derivatives not designated in a hedging relationship
Foreign exchange contracts
Amount of (gain) loss recognized in Other (income) expense, net on derivatives (2)	(47		)	24

⁽¹⁾ There was $1 million and $3 million of ineffectiveness on the hedge during the first quarter of 2017 and 2016, respectively.

⁽²⁾ These derivative contracts mitigate changes in the value of remeasured foreign currency denominated monetary assets and liabilities attributable to changes in foreign currency exchange rates.

Information on Available-for-sale Investments

Information on investments in debt and equity securities is as follows:

	March 31, 2017									December 31, 2016
	Fair Value		Amortized Cost		Gross Unrealized					Fair Value		Amortized Cost		Gross Unrealized
($ in millions)					Gains		Losses							Gains		Losses
Corporate notes and bonds	$	10,445	$	10,455	$	19	$	(29	)	$	10,577	$	10,601	$	15	$	(39	)
U.S. government and agency securities	2,011		2,021		1		(11		)	2,232		2,244		1		(13		)
Asset-backed securities	1,410		1,411		2		(3		)	1,376		1,380		1		(5		)
Commercial paper	773		773		—		—			4,330		4,330		—		—
Mortgage-backed securities	712		717		—		(5		)	796		801		1		(6		)
Foreign government bonds	560		561		1		(2		)	519		521		—		(2		)
Equity securities	356		278		79		(1		)	349		281		71		(3		)
	$	16,267	$	16,216	$	102	$	(51	)	$	20,179	$	20,158	$	89	$	(68	)

Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

Financial assets and liabilities measured at fair value on a recurring basis are summarized below:

	Fair Value Measurements Using								Fair Value Measurements Using
	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total		Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
($ in millions)	March 31, 2017								December 31, 2016
Assets
Investments
Corporate notes and bonds	$	—	$	10,287	$	—	$	10,287	$	—	$	10,389	$	—	$	10,389
U.S. government and agency securities	66		1,647		—		1,713		29		1,890		—		1,919
Asset-backed securities (1)	—		1,312		—		1,312		—		1,257		—		1,257
Commercial paper	—		773		—		773		—		4,330		—		4,330
Mortgage-backed securities (1)	—		595		—		595		—		628		—		628
Foreign government bonds	—		559		—		559		—		518		—		518
Equity securities	198		—		—		198		201		—		—		201
	264		15,173		—		15,437		230		19,012		—		19,242
Other assets
U.S. government and agency securities	—		298		—		298		—		313		—		313
Corporate notes and bonds	—		158		—		158		—		188		—		188
Mortgage-backed securities (1)	—		117		—		117		—		168		—		168
Asset-backed securities (1)	—		98		—		98		—		119		—		119
Foreign government bonds	—		1		—		1		—		1		—		1
Equity securities	158		—		—		158		148		—		—		148
	158		672		—		830		148		789		—		937
Derivative assets (2)
Purchased currency options	—		354		—		354		—		644		—		644
Forward exchange contracts	—		264		—		264		—		331		—		331
Interest rate swaps	—		11		—		11		—		20		—		20
	—		629		—		629		—		995		—		995
Total assets	$	422	$	16,474	$	—	$	16,896	$	378	$	20,796	$	—	$	21,174
Liabilities
Other liabilities
Contingent consideration	$	—	$	—	$	925	$	925	$	—	$	—	$	891	$	891
Derivative liabilities (2)
Forward exchange contracts	—		110		—		110		—		93		—		93
Interest rate swaps	—		35		—		35		—		29		—		29
Written currency options	—		1		—		1		—		12		—		12
	—		146		—		146		—		134		—		134
Total liabilities	$	—	$	146	$	925	$	1,071	$	—	$	134	$	891	$	1,025

⁽¹⁾  Primarily all of the asset-backed securities are highly-rated (Standard & Poor’s rating of AAA and Moody’s Investors Service rating of Aaa), secured primarily by auto loan, credit card and student loan receivables, with weighted-average lives of primarily 5 years or less. Mortgage-backed securities represent AAA-rated securities issued or unconditionally guaranteed as to payment of principal and interest by U.S. government agencies.

⁽²⁾  The fair value determination of derivatives includes the impact of the credit risk of counterparties to the derivatives and the Company’s own credit risk, the effects of which were not significant.

Information About the Changes in Liabilities for Contingent Consideration

Summarized information about the changes in liabilities for contingent consideration is as follows:

	Three Months Ended March 31,
($ in millions)	2017		2016
Fair value January 1	$	891	$	590
Changes in fair value (1)	34		10
Additions	—		77
Payments	—		(25		)
Fair value March 31	$	925	$	652

⁽¹⁾ Recorded in Research and development expenses, Materials and production costs and Other (income) expense, net. Includes cumulative translation adjustments.

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Inventories (Tables)

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of:

($ in millions)	March 31, 2017		December 31, 2016
Finished goods	$	1,355	$	1,304
Raw materials and work in process	4,446		4,222
Supplies	160		155
Total (approximates current cost)	5,961		5,681
Increase to LIFO costs	275		302
	$	6,236	$	5,983
Recognized as:
Inventories	$	5,146	$	4,866
Other assets	1,090		1,117

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Equity (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Equity

	Common Stock			Other Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock					Non- Controlling Interests			Total
($ and shares in millions)	Shares	Par Value											Shares		Cost
Balance at January 1, 2016	3,577	$	1,788	$	40,222		$	45,348		$	(4,148	)	796		$	(38,534	)	$	91		$	44,767
Net income attributable to Merck & Co., Inc.	—	—		—			1,125			—			—		—			—			1,125
Other comprehensive loss, net of tax	—	—		—			—			(46		)	—		—			—			(46		)
Cash dividends declared on common stock	—	—		—			(1,281		)	—			—		—			—			(1,281		)
Treasury stock shares purchased	—	—		—			—			—			18		(913		)	—			(913		)
Share-based compensation plans and other	—	—		(77		)	—			—			(6	)	322			—			245
Net income attributable to noncontrolling interests	—	—		—			—			—			—		—			5			5
Distributions attributable to noncontrolling interests	—	—		—			—			—			—		—			(1		)	(1		)
Balance at March 31, 2016	3,577	$	1,788	$	40,145		$	45,192		$	(4,194	)	808		$	(39,125	)	$	95		$	43,901
Balance at January 1, 2017	3,577	$	1,788	$	39,939		$	44,133		$	(5,226	)	828		$	(40,546	)	$	220		$	40,308
Net income attributable to Merck & Co., Inc.	—	—		—			1,551			—			—		—			—			1,551
Other comprehensive income, net of tax	—	—		—			—			146			—		—			—			146
Cash dividends declared on common stock	—	—		—			(1,297		)	—			—		—			—			(1,297		)
Treasury stock shares purchased	—	—		—			—			—			16		(1,019		)	—			(1,019		)
Share-based compensation plans and other	—	—		(40		)	—			—			(7	)	408			—			368
Acquisition of Vallée	—	—		—			—			—			—		—			25			25
Net income attributable to noncontrolling interests	—	—		—			—			—			—		—			5			5
Other changes in noncontrolling ownership interests	—	—		—			—			—			—		—			1			1
Balance at March 31, 2017	3,577	$	1,788	$	39,899		$	44,387		$	(5,080	)	837		$	(41,157	)	$	251		$	40,088

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Share-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2017

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

Amounts of Share-Based Compensation Cost Recorded in Consolidated Statement of Income

The following table provides the amounts of share-based compensation cost recorded in the Condensed Consolidated Statement of Income:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Pretax share-based compensation expense	$	74		$	68
Income tax benefit	(22		)	(20		)
Total share-based compensation expense, net of taxes	$	52		$	48

Assumptions Used to Determine Weighted-Average Fair Value of Options Granted

The weighted-average fair value of options granted for the first three months of 2017 and 2016 was $7.89 and $5.76 per option, respectively, and was determined using the following assumptions:

	Three Months Ended March 31,
	2017		2016
Expected dividend yield	3.7	%	3.8	%
Risk-free interest rate	2.0	%	1.3	%
Expected volatility	19.7	%	21.0	%
Expected life (years)	6.2		6.2

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Pension and Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2017

Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Components of net cost of defined benefit plans

The Company has defined benefit pension plans covering eligible employees in the United States and in certain of its international subsidiaries. The net periodic benefit cost (credit) of such plans consisted of the following components:

	Three Months Ended   March 31,
	2017						2016
($ in millions)	U.S.			International			U.S.			International
Service cost	$	77		$	61		$	73		$	58
Interest cost	113			41			113			52
Expected return on plan assets	(218		)	(94		)	(210		)	(95		)
Amortization of unrecognized prior service credit	(13		)	(2		)	(14		)	(3		)
Net loss amortization	44			23			29			22
Termination benefits	5			1			4			—
Curtailments	3			—			—			1
	$	11		$	30		$	(5	)	$	35

Other Postretirement Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Components of net cost of defined benefit plans

The Company provides medical benefits, principally to its eligible U.S. retirees and similar benefits to their dependents, through its other postretirement benefit plans. The net cost (credit) of such plans consisted of the following components:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Service cost	$	14		$	13
Interest cost	20			21
Expected return on plan assets	(19		)	(35		)
Amortization of unrecognized prior service credit	(25		)	(26		)
Termination benefits	1			1
Curtailments	(3		)	(1		)
	$	(12	)	$	(27	)

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Other (Income) Expense, Net (Tables)

3 Months Ended

Mar. 31, 2017

Other Income and Expenses [Abstract]

Other (Income) Expense, Net

Other (income) expense, net, consisted of:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Interest income	$	(97	)	$	(79	)
Interest expense	182			172
Exchange (gains) losses	(8		)	38
Equity loss (income) from affiliates	13			(34		)
Other, net	(32		)	(49		)
	$	58		$	48

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Calculations of Earnings Per Share

The calculations of earnings per share are as follows:

	Three Months Ended   March 31,
($ and shares in millions except per share amounts)	2017		2016
Net income attributable to Merck & Co., Inc.	$	1,551	$	1,125
Average common shares outstanding	2,745		2,774
Common shares issuable (1)	21		21
Average common shares outstanding assuming dilution	2,766		2,795
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders	$	0.56	$	0.41
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders	$	0.56	$	0.40

⁽¹⁾  Issuable primarily under share-based compensation plans.

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Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Changes in AOCI by Component

Changes in AOCI by component are as follows:

	Three Months Ended March 31,
($ in millions)	Derivatives				Investments				Employee Benefit Plans				Cumulative Translation Adjustment			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2016, net of taxes	$	404			$	41			$	(2,407	)		$	(2,186	)	$	(4,148	)
Other comprehensive income (loss) before reclassification adjustments, pretax	(167		)		54				(35		)		99			(49		)
Tax	58				16				(1		)		22			95
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(109		)		70				(36		)		121			46
Reclassification adjustments, pretax	(143		)	(1)	(11		)	(2)	7			(3)	—			(147		)
Tax	50				4				1				—			55
Reclassification adjustments, net of taxes	(93		)		(7		)		8				—			(92		)
Other comprehensive income (loss), net of taxes	(202		)		63				(28		)		121			(46		)
Balance March 31, 2016, net of taxes	$	202			$	104			$	(2,435	)		$	(2,065	)	$	(4,194	)
Balance January 1, 2017, net of taxes	$	338			$	(3	)		$	(3,206	)		$	(2,355	)	$	(5,226	)
Other comprehensive income (loss) before reclassification adjustments, pretax	(263		)		87				(4		)		263			83
Tax	92				(7		)		9				46			140
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(171		)		80				5				309			223
Reclassification adjustments, pretax	(95		)	(1)	(57		)	(2)	28			(3)	—			(124		)
Tax	34				20				(7		)		—			47
Reclassification adjustments, net of taxes	(61		)		(37		)		21				—			(77		)
Other comprehensive income (loss), net of taxes	(232		)		43				26				309			146
Balance March 31, 2017, net of taxes	$	106			$	40			$	(3,180	)		$	(2,046	)	$	(5,080	)

⁽¹⁾  Relates to foreign currency cash flow hedges that were reclassified from AOCI to Sales.

⁽²⁾  Represents net realized (gains) losses on the sales of available-for-sale investments that were reclassified from AOCI to Other (income) expense, net.

⁽³⁾  Includes net amortization of prior service cost and actuarial gains and losses included in net periodic benefit cost (see Note 10).

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Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Sales of Company's products

Sales of the Company’s products were as follows:

	Three Months Ended   March 31,
($ in millions)	2017		2016
Primary Care and Women’s Health
Cardiovascular
Zetia	$	334	$	612
Vytorin	241		277
Liptruzet	49		23
Adempas	84		33
Diabetes
Januvia	839		906
Janumet	496		506
General Medicine and Women’s Health
Implanon/Nexplanon	170		134
NuvaRing	160		175
Follistim AQ	81		94
Hospital and Specialty
Hepatitis
Zepatier	378		50
HIV
Isentress	305		340
Hospital Acute Care
Bridion	148		90
Noxafil	141		145
Invanz	136		114
Cancidas	121		133
Cubicin	96		292
Primaxin	62		73
Immunology
Remicade	229		349
Simponi	184		188
Oncology
Keytruda	584		249
Emend	133		126
Temodar	66		66
Diversified Brands
Respiratory
Singulair	186		237
Nasonex	139		229
Dulera	82		113
Other
Cozaar/Hyzaar	112		126
Arcoxia	103		111
Fosamax	61		75
Vaccines (1)
Gardasil/Gardasil 9	532		378
ProQuad/M-M-R II/Varivax	355		357
RotaTeq	224		188
Pneumovax 23	163		107
Zostavax	154		125
Other pharmaceutical (2)	1,037		1,083
Total Pharmaceutical segment sales	8,185		8,104
Other segment sales (3)	1,033		905
Total segment sales	9,218		9,009
Other (4)	216		303
	$	9,434	$	9,312

⁽¹⁾  On December 31, 2016, Merck and Sanofi Pasteur terminated their equally-owned joint venture, SPMSD, which marketed vaccines in most major European markets. Accordingly, vaccine sales in 2017 include sales in the European markets that were previously part of SPMSD. Amounts for 2016 do not include sales of vaccines sold through SPMSD, the results of which are reflected inequity income from affiliates which is included in Other (income) expense, net. Amounts for 2016 do, however, include supply sales to SPMSD.

⁽²⁾  Other pharmaceutical primarily reflects sales of other human health pharmaceutical products, including products within the franchises not listed separately.

⁽³⁾  Represents the non-reportable segments of Animal Health, Healthcare Services and Alliances.

⁽⁴⁾  Other is primarily comprised of miscellaneous corporate revenues, including revenue hedging activities, as well as third-party manufacturing sales. Other in the first quarter of 2017 and 2016 also includes $50 million and $75 million, respectively, related to the sale of the marketing rights to certain products.

Reconciliation of segment profits to income before taxes

A reconciliation of segment profits to Income before taxes is as follows:

	Three Months Ended   March 31,
($ in millions)	2017			2016
Segment profits:
Pharmaceutical segment	$	5,180		$	5,117
Other segments	452			355
Total segment profits	5,632			5,472
Other profits	142			227
Unallocated:
Interest income	97			79
Interest expense	(182		)	(172		)
Equity income from affiliates	(12		)	20
Depreciation and amortization	(370		)	(428		)
Research and development	(1,599		)	(1,373		)
Amortization of purchase accounting adjustments	(778		)	(1,133		)
Restructuring costs	(151		)	(91		)
Other unallocated, net	(776		)	(977		)
	$	2,003		$	1,624

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Acquisitions, Divestitures, Research Collaborations and License Agreements - Narrative (Details) - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2017	Jan. 31, 2016	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Goodwill	$ 18,358		$ 18,162
Contingent consideration	$ 925		$ 891	$ 652	$ 590
Vallee SA
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Percentage of business acquired (as percent)	93.50%
Cash paid for acquisition of business	$ 358
Escrow deposit	176
Intangible assets	297
Deferred tax liabilities noncurrent	95
Other net assets	1
Noncontrolling interest	25
Contingent liabilities	37
Indemnification assets	37
Goodwill	$ 180
Discount rate (as percent)	15.50%
Acquired finite-lived intangible assets, weighted average useful life	15 years
IOmet Pharma Ltd
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Cash paid for acquisition of business		$ 150
Goodwill		$ 57
Discount rate (as percent)		10.50%
Amount of potential future additional payments for milestones, maximum		$ 250
Contingent consideration		94
In-process research and development (IPR&D)		155
Deferred tax assets noncurrent		$ 32

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Acquisitions, Divestitures, Research Collaborations and License Agreements - Divestitures Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Acquisitions, Divestitures, Research Collaborations and License Agreements Transactions [Line Items]
Proceeds from sale of marketing rights	$ 50	$ 75
corticotropin marketing rights
Acquisitions, Divestitures, Research Collaborations and License Agreements Transactions [Line Items]
Proceeds from sale of marketing rights		$ 75

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Restructuring - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) position	Mar. 31, 2016 USD ($) position
Restructuring and Related Activities [Abstract]
Total pretax restructuring costs	$ 215	$ 196
Cumulative restructuring costs incurred to date since program inception	$ 12,800
Positions eliminated since inception of program (in positions) | position	41,445
Estimated remaining costs related to restructuring program activities	$ 500
Percentage estimate of cumulative pretax costs that will result in cash outlays (primarily from employee separation expense) (as percent)	66.67%
Percentage estimate of cumulative pretax costs that will be non-cash (primarily from accelerated depreciation of facilities) (as percent)	33.33%
Number of positions eliminated | position	545	470

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Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	$ 215	$ 196
Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	84	26
Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	49	80
Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	82	90
Materials and production
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	63	47
Materials and production | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0
Materials and production | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	51	22
Materials and production | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	12	25
Marketing and administrative
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	1	3
Marketing and administrative | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0
Marketing and administrative | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	3
Marketing and administrative | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	1	0
Research and development
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	55
Research and development | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0
Research and development | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	(2)	55
Research and development | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	2	0
Restructuring costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	151	91
Restructuring costs | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	84	26
Restructuring costs | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0
Restructuring costs | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	$ 67	$ 65

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Restructuring - Charges and Spending Relating to Restructuring Activities by Program (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 541
Expense	215	$ 196
(Payments) receipts, net	(221)
Non-cash activity	(22)
Restructuring reserve, ending balance	513
Separation Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	395
Expense	84	26
(Payments) receipts, net	(103)
Non-cash activity	0
Restructuring reserve, ending balance	376
Accelerated Depreciation
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0
Expense	49	80
(Payments) receipts, net	0
Non-cash activity	(49)
Restructuring reserve, ending balance	0
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	146
Expense	82	$ 90
(Payments) receipts, net	(118)
Non-cash activity	27
Restructuring reserve, ending balance	$ 137

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Financial Instruments - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) interest_rate_swap	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Derivative [Line Items]
Pretax gains (losses) from euro-denominated notes included in cumulative translation adjustments	$ 135	$ 58
Number of interest rate swaps held (in interest rate swaps) | interest_rate_swap	26
Pretax net unrealized gains on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales	$ 167
Available-for-sale debt securities included in Short-term investments	3,500
Available-for-sale debt securities maturing after one year through five years	10,600
Cash and cash equivalents	11,708	$ 9,716	$ 6,515	$ 8,524
Cash equivalents	10,900
Fair value of loans payable and long-term debt, including current portion	29,300		25,700
Carrying value of loans payable and long-term debt, including current portion	28,500		24,800
Accounts receivable outstanding for more than one year	135
Cash collateral received from counterparties	$ 222		$ 529
Derivatives Designated as Hedging Instruments | Maximum
Derivative [Line Items]
Maximum average period of maturities of contracts in years (less than)	2 years
Derivatives Not Designated as Hedging Instruments | Maximum
Derivative [Line Items]
Maximum average period of maturities of contracts in years (less than)	1 year

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Financial Instruments - Summary of Interest Rate Swaps Held (Details)	Mar. 31, 2017 USD ($) interest_rate_swap	Dec. 31, 2016 USD ($)
Derivative [Line Items]
Number of Interest Rate Swaps Held (in interest rate swaps) | interest_rate_swap	26
Total Swap Notional Amount	$ 28,515,000,000	$ 25,539,000,000
1.30% notes due 2018 | Interest rate swap contracts
Derivative [Line Items]
Stated interest rate (as percent)	1.30%
Par Value of Debt	$ 1,000,000,000
Number of Interest Rate Swaps Held (in interest rate swaps) | interest_rate_swap	4
Total Swap Notional Amount	$ 1,000,000,000
5.00% notes due 2019 | Interest rate swap contracts
Derivative [Line Items]
Stated interest rate (as percent)	5.00%
Par Value of Debt	$ 1,250,000,000
Number of Interest Rate Swaps Held (in interest rate swaps) | interest_rate_swap	3
Total Swap Notional Amount	$ 550,000,000
1.85% notes due 2020 | Interest rate swap contracts
Derivative [Line Items]
Stated interest rate (as percent)	1.85%
Par Value of Debt	$ 1,250,000,000
Number of Interest Rate Swaps Held (in interest rate swaps) | interest_rate_swap	5
Total Swap Notional Amount	$ 1,250,000,000
3.875% notes due 2021 | Interest rate swap contracts
Derivative [Line Items]
Stated interest rate (as percent)	3.875%
Par Value of Debt	$ 1,150,000,000
Number of Interest Rate Swaps Held (in interest rate swaps) | interest_rate_swap	5
Total Swap Notional Amount	$ 1,150,000,000
2.40% notes due 2022 | Interest rate swap contracts
Derivative [Line Items]
Stated interest rate (as percent)	2.40%
Par Value of Debt	$ 1,000,000,000
Number of Interest Rate Swaps Held (in interest rate swaps) | interest_rate_swap	4
Total Swap Notional Amount	$ 1,000,000,000
2.35% notes due 2022 | Interest rate swap contracts
Derivative [Line Items]
Stated interest rate (as percent)	2.35%
Par Value of Debt	$ 1,250,000,000
Number of Interest Rate Swaps Held (in interest rate swaps) | interest_rate_swap	5
Total Swap Notional Amount	$ 1,250,000,000

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Financial Instruments - Fair Value of Derivatives Segregated between those Derivatives that are Designated as Hedging Instruments and those that are Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	$ 629	$ 995
Fair Value of Derivative, Liability	146	134
U.S. Dollar Notional	28,515	25,539
Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	397	765
Fair Value of Derivative, Liability	57	31
U.S. Dollar Notional	13,999	14,398
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	232	230
Fair Value of Derivative, Liability	89	103
U.S. Dollar Notional	14,516	11,141
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other assets
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	11	20
U.S. Dollar Notional	2,700	2,700
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Liability	35	29
U.S. Dollar Notional	3,500	3,500
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other assets
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	56	129
U.S. Dollar Notional	1,815	2,075
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Liability	1	1
U.S. Dollar Notional	20	12
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other current assets
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	330	616
U.S. Dollar Notional	5,049	6,063
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Accrued and other current liabilities
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Liability	21	1
U.S. Dollar Notional	915	48
Foreign exchange contracts | Derivatives Not Designated as Hedging Instruments | Other current assets
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	232	230
U.S. Dollar Notional	8,037	8,210
Foreign exchange contracts | Derivatives Not Designated as Hedging Instruments | Accrued and other current liabilities
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Liability	89	103
U.S. Dollar Notional	$ 6,479	$ 2,931

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Financial Instruments - Information on Derivative Positions Subject to Master Netting Arrangements as if they were Presented on a Net Basis (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross amounts recognized in the consolidated balance sheet, asset	$ 629	$ 995
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, asset	(144)	(131)
Cash collateral received, asset	(222)	(529)
Net amounts, asset	263	335
Gross amounts recognized in the consolidated balance sheet, liability	146	134
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, liability	(144)	(131)
Cash collateral received, liability	0	0
Net amounts, liability	$ 2	$ 3

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Financial Instruments - Location and Pretax Gain or Loss Amounts for Derivatives (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, net hedge ineffectiveness (gain) loss	$ (1)	$ (3)
Interest rate swap contracts | Derivatives designated in a fair value hedging relationship
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss (gain) recognized in Other (income) expense, net on derivatives	15	(150)
Amount of (gain) loss recognized in Other (income) expense, net on hedged item	(16)	147
Foreign exchange contracts | Derivatives not designated in a hedging relationship
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss (gain) recognized in Other (income) expense, net on derivatives	(47)	24
Foreign exchange contracts | Derivatives designated in foreign currency cash flow hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain reclassified from AOCI to Sales	(94)	(143)
Amount of loss recognized in OCI on derivatives	$ 263	$ 167

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Financial Instruments - Information on Available-for-sale Investments (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 16,267	$ 20,179
Amortized Cost	16,216	20,158
Gross Unrealized Gains	102	89
Gross Unrealized Losses	(51)	(68)
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value	773	4,330
Amortized Cost	773	4,330
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	10,445	10,577
Amortized Cost	10,455	10,601
Gross Unrealized Gains	19	15
Gross Unrealized Losses	(29)	(39)
U.S. government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	2,011	2,232
Amortized Cost	2,021	2,244
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(11)	(13)
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,410	1,376
Amortized Cost	1,411	1,380
Gross Unrealized Gains	2	1
Gross Unrealized Losses	(3)	(5)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	712	796
Amortized Cost	717	801
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(5)	(6)
Foreign government bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	560	519
Amortized Cost	561	521
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(2)	(2)
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	356	349
Amortized Cost	278	281
Gross Unrealized Gains	79	71
Gross Unrealized Losses	$ (1)	$ (3)

XML

Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Assets
Investments	$ 16,267	$ 20,179
Derivative assets	629	995
Liabilities
Contingent consideration	925	891	$ 652	$ 590
Derivative liabilities	146	134
Commercial paper
Assets
Investments	773	4,330
Corporate notes and bonds
Assets
Investments	10,445	10,577
U.S. government and agency securities
Assets
Investments	2,011	2,232
Asset-backed securities
Assets
Investments	$ 1,410	1,376
Liabilities
Primary weighted average life of collateral	5 years
Mortgage-backed securities
Assets
Investments	$ 712	796
Foreign government bonds
Assets
Investments	560	519
Equity securities
Assets
Investments	356	349
Fair Value, Measurements, Recurring
Assets
Investments	15,437	19,242
Other assets	830	937
Derivative assets	629	995
Total assets	16,896	21,174
Liabilities
Contingent consideration	925	891
Derivative liabilities	146	134
Total liabilities	1,071	1,025
Fair Value, Measurements, Recurring | Purchased currency options
Assets
Derivative assets	354	644
Liabilities
Derivative liabilities	1	12
Fair Value, Measurements, Recurring | Foreign exchange contracts
Assets
Derivative assets	264	331
Liabilities
Derivative liabilities	110	93
Fair Value, Measurements, Recurring | Interest rate swap contracts
Assets
Derivative assets	11	20
Liabilities
Derivative liabilities	35	29
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	264	230
Other assets	158	148
Derivative assets	0	0
Total assets	422	378
Liabilities
Contingent consideration	0	0
Derivative liabilities	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Purchased currency options
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Foreign exchange contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Interest rate swap contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Investments	15,173	19,012
Other assets	672	789
Derivative assets	629	995
Total assets	16,474	20,796
Liabilities
Contingent consideration	0	0
Derivative liabilities	146	134
Total liabilities	146	134
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Purchased currency options
Assets
Derivative assets	354	644
Liabilities
Derivative liabilities	1	12
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts
Assets
Derivative assets	264	331
Liabilities
Derivative liabilities	110	93
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts
Assets
Derivative assets	11	20
Liabilities
Derivative liabilities	35	29
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Other assets	0	0
Derivative assets	0	0
Total assets	0	0
Liabilities
Contingent consideration	925	891
Derivative liabilities	0	0
Total liabilities	925	891
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Purchased currency options
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Commercial paper
Assets
Investments	773	4,330
Fair Value, Measurements, Recurring | Commercial paper | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	0	0
Fair Value, Measurements, Recurring | Commercial paper | Significant Other Observable Inputs (Level 2)
Assets
Investments	773	4,330
Fair Value, Measurements, Recurring | Commercial paper | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Fair Value, Measurements, Recurring | Corporate notes and bonds
Assets
Investments	10,287	10,389
Other assets	158	188
Fair Value, Measurements, Recurring | Corporate notes and bonds | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Other Observable Inputs (Level 2)
Assets
Investments	10,287	10,389
Other assets	158	188
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | U.S. government and agency securities
Assets
Investments	1,713	1,919
Other assets	298	313
Fair Value, Measurements, Recurring | U.S. government and agency securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	66	29
Other assets	0	0
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Other Observable Inputs (Level 2)
Assets
Investments	1,647	1,890
Other assets	298	313
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Asset-backed securities
Assets
Investments	1,312	1,257
Other assets	98	119
Fair Value, Measurements, Recurring | Asset-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Other Observable Inputs (Level 2)
Assets
Investments	1,312	1,257
Other assets	98	119
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Mortgage-backed securities
Assets
Investments	595	628
Other assets	117	168
Fair Value, Measurements, Recurring | Mortgage-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Other Observable Inputs (Level 2)
Assets
Investments	595	628
Other assets	117	168
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Foreign government bonds
Assets
Investments	559	518
Other assets	1	1
Fair Value, Measurements, Recurring | Foreign government bonds | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Other Observable Inputs (Level 2)
Assets
Investments	559	518
Other assets	1	1
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Equity securities
Assets
Investments	198	201
Other assets	158	148
Fair Value, Measurements, Recurring | Equity securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	198	201
Other assets	158	148
Fair Value, Measurements, Recurring | Equity securities | Significant Other Observable Inputs (Level 2)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Equity securities | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Other assets	$ 0	$ 0

XML

Financial Instruments - Information About Changes in Liabilities for Contingent Consideration (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning balance	$ 891	$ 590
Changes in fair value	34	10
Additions	0	77
Payments	0	(25)
Fair value, ending balance	$ 925	$ 652

XML

Inventories - Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished goods	$ 1,355	$ 1,304
Raw materials and work in process	4,446	4,222
Supplies	160	155
Total (approximates current cost)	5,961	5,681
Increase to LIFO costs	275	302
Total current and noncurrent inventories	6,236	5,983
Recognized as:
Inventories	5,146	4,866
Other Assets	$ 1,090	$ 1,117

XML

Inventories - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Inventories classified in Other assets	$ 1,090	$ 1,117
Inventories Not Expected to be Sold Within One Year
Inventory [Line Items]
Inventories classified in Other assets	1,000	1,000
Inventories Produced in Preparation for Product Launches
Inventory [Line Items]
Inventories classified in Other assets	$ 80	$ 80

XML

Other Intangibles - Finite-Lived Intangible Assets Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Zontivity
Finite-Lived Intangible Assets [Line Items]
Intangible asset impairment charges related to finite-lived intangible assets	$ 252

XML

Other Intangibles - Indefinite-Lived Intangible Assets Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
In-process research and development impairment charges	$ 25

XML

Contingencies - Fosamax Litigation - Narrative (Details) - Fosamax $ in Millions	1 Months Ended			3 Months Ended
	Jul. 31, 2014 USD ($)	Mar. 31, 2014 legalmatter	Dec. 31, 2013 USD ($) legalmatter	Mar. 31, 2017 legalmatter	Jul. 31, 2015 legalmatter	Nov. 30, 2013 legalmatter
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)				4,215
ONJ Litigation
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)				20
Settlement agreement amount for (against) the company | $	$ (27.3)		$ (27.7)
Number of claims settled (in legal matters)			1,200
Percentage of participation in litigation settlement (as percent)	95.00%
Femur Fracture Litigation
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)				4,195
Femur Fracture Litigation | Federal
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)				7
Loss contingency, claims dismissed, number (in legal matters)		650		540
Loss contingency, claims on appeal, number (in legal matters)				515
Femur Fracture Litigation | New Jersey state court
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)				2,855
Loss contingency, initial cases selected for review, number (in legal matters)				30
Loss contingency, subsequent cases selected for review, number (in legal matters)		50			25	50
Femur Fracture Litigation | California state court
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)				280
Loss contingency, initial cases selected for review, number (in legal matters)		10
Femur Fracture Litigation | Other state courts
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)				5

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Contingencies - Januvia/Janumet Litigation - Narrative (Details) - Januvia - legalmatter	1 Months Ended
	Nov. 30, 2015	Mar. 31, 2017
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)		1,200
Loss contingency, claims dismissed, number (in legal matters)	1,150
Cases Company Agreed ToToll Statute Of Limitations
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)		50
Other state courts
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)		8
Other state courts | Illinois state court
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)		4

XML

Contingencies - Propecia/Proscar Litigation - Narrative (Details)	3 Months Ended
	Mar. 31, 2017 legalmatter Plaintiff
Propecia
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)	1,260
Propecia | Cases alleging cancer
Loss Contingencies [Line Items]
Number of plaintiffs | Plaintiff	50
Propecia/Proscar | Other state courts | California state court
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)	1
Propecia/Proscar | Other state courts | Ohio state court
Loss Contingencies [Line Items]
Loss contingency, pending claims, number (in legal matters)	1

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Contingencies Contingencies - Commercial and Other Litigation Narrative (Details) $ in Millions	1 Months Ended
	Feb. 28, 2017 USD ($)
Commercial litigation
Loss Contingencies [Line Items]
Judgement awarded to (against) Merck	$ (80)

XML

Contingencies - Patent Litigation - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended	36 Months Ended	84 Months Ended
	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2026	Dec. 31, 2023
Anti-PD-1 Antibody Patent Case
Loss Contingencies [Line Items]
Judgement awarded to (against) Merck			$ (625)
Anti-PD-1 Antibody Patent Case | Forecast
Loss Contingencies [Line Items]
Royalty rate (as percent)				2.50%	6.50%
Gilead Patent Case
Loss Contingencies [Line Items]
Judgment awarded to Merck	$ 2,540	$ 200
Percentage of settlement to be paid to third-party (as percent)		20.00%

XML

Contingencies - Legal Defense Reserves - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Legal Defense Costs
Loss Contingencies [Line Items]
Legal defense costs reserve	$ 175	$ 185

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Equity - Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, beginning balance (in shares)	3,577,103,522
Equity, beginning balance	$ 40,308	$ 44,767
Net income attributable to Merck & Co., Inc.	1,551	1,125
Other comprehensive income (loss), net of tax	146	(46)
Cash dividends declared on common stock	(1,297)	(1,281)
Treasury stock shares purchased	(1,019)	(913)
Share-based compensation plans and other	368	245
Acquisition of Vallée	25
Net income attributable to noncontrolling interests	5	5
Distributions attributable to noncontrolling interests		(1)
Other changes in noncontrolling ownership interests	$ 1
Shares, ending balance (in shares)	3,577,103,522
Equity, ending balance	$ 40,088	$ 43,901
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, beginning balance (in shares)	3,577,000,000	3,577,000,000
Equity, beginning balance	$ 1,788	$ 1,788
Shares, ending balance (in shares)	3,577,000,000	3,577,000,000
Equity, ending balance	$ 1,788	$ 1,788
Other Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity, beginning balance	39,939	40,222
Share-based compensation plans and other	(40)	(77)
Equity, ending balance	39,899	40,145
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity, beginning balance	44,133	45,348
Net income attributable to Merck & Co., Inc.	1,551	1,125
Cash dividends declared on common stock	(1,297)	(1,281)
Equity, ending balance	44,387	45,192
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity, beginning balance	(5,226)	(4,148)
Other comprehensive income (loss), net of tax	146	(46)
Equity, ending balance	$ (5,080)	$ (4,194)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, beginning balance (in shares)	828,000,000	796,000,000
Equity, beginning balance	$ (40,546)	$ (38,534)
Treasury stock shares purchased (in shares)	16,000,000	18,000,000
Treasury stock shares purchased	$ (1,019)	$ (913)
Share-based compensation plans and other (in shares)	(7,000,000)	(6,000,000)
Share-based compensation plans and other	$ 408	$ 322
Shares, ending balance (in shares)	837,000,000	808,000,000
Equity, ending balance	$ (41,157)	$ (39,125)
Non- Controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity, beginning balance	220	91
Acquisition of Vallée	25
Net income attributable to noncontrolling interests	5	5
Distributions attributable to noncontrolling interests		(1)
Other changes in noncontrolling ownership interests	1
Equity, ending balance	$ 251	$ 95

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Share-Based Compensation Plans - Amounts of Share-Based Compensation Cost Recorded in Consolidated Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Pretax share-based compensation expense	$ 74	$ 68
Income tax benefit	(22)	(20)
Total share-based compensation expense, net of taxes	$ 52	$ 48

XML

Share-Based Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
RSUs granted (in shares)	86	133
Weighted-average fair value per RSU granted (in dollars per share)	$ 64.20	$ 48.83
Options granted (in shares)	190	74
Weighted- average exercise price of options granted in period (in dollars per share)	$ 64.20	$ 48.83
Weighted- average fair value per option granted (in dollars per share)	$ 7.89	$ 5.76
Total pretax unrecognized compensation expense related to nonvested stock options	$ 681
Weighted average period in years of recognition for nonvested stock options	2 years 4 months 21 days

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Share-Based Compensation Plans - Assumptions Used to Determine Weighted-Average Fair Value of Options Granted (Details)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected dividend yield	3.70%	3.80%
Risk-free interest rate	2.00%	1.30%
Expected volatility	19.70%	21.00%
Expected life (years)	6 years 2 months 12 days	6 years 2 months 12 days

XML

Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 77	$ 73
Interest cost	113	113
Expected return on plan assets	(218)	(210)
Amortization of unrecognized prior service credit	(13)	(14)
Net loss amortization	44	29
Termination benefits	5	4
Curtailments	3	0
Net periodic benefit cost	11	(5)
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	61	58
Interest cost	41	52
Expected return on plan assets	(94)	(95)
Amortization of unrecognized prior service credit	(2)	(3)
Net loss amortization	23	22
Termination benefits	1	0
Curtailments	0	1
Net periodic benefit cost	30	35
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	13
Interest cost	20	21
Expected return on plan assets	(19)	(35)
Amortization of unrecognized prior service credit	(25)	(26)
Termination benefits	1	1
Curtailments	(3)	(1)
Net periodic benefit cost	$ (12)	$ (27)

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Other (Income) Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expenses [Abstract]
Interest income	$ (97)	$ (79)
Interest expense	182	172
Exchange (gains) losses	(8)	38
Equity loss (income) from affiliates	13	(34)
Other, net	(32)	(49)
Other (income) expense, net	$ 58	$ 48

XML

Other (Income) Expense, Net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expenses [Abstract]
Interest paid	$ 162	$ 160

XML

Taxes on Income - Narrative (Details)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate	22.30%	30.40%

XML

Earnings Per Share - Calculations of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 1,551	$ 1,125
Average common shares outstanding (in shares)	2,745	2,774
Common shares issuable (in shares)	21	21
Average common shares outstanding assuming dilution (in shares)	2,766	2,795
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders (in dollars per share)	$ 0.56	$ 0.41
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders (in dollars per share)	$ 0.56	$ 0.40

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Earnings Per Share - Narrative (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Common shares issuable under share-based compensation plans excluded from diluted earnings per common share because the effect would have been antidilutive (in shares)	2	10

XML

Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Equity, beginning balance	$ 40,308	$ 44,767
Other comprehensive income (loss), net of taxes	146	(46)
Equity, ending balance	40,088	43,901
Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Equity, beginning balance	338	404
Other comprehensive income (loss) before reclassification adjustments, pretax	(263)	(167)
Tax	92	58
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(171)	(109)
Reclassification adjustments, pretax	(95)	(143)
Tax	34	50
Reclassification adjustments, net of taxes	(61)	(93)
Other comprehensive income (loss), net of taxes	(232)	(202)
Equity, ending balance	106	202
Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Equity, beginning balance	(3)	41
Other comprehensive income (loss) before reclassification adjustments, pretax	87	54
Tax	(7)	16
Other comprehensive income (loss) before reclassification adjustments, net of taxes	80	70
Reclassification adjustments, pretax	(57)	(11)
Tax	20	4
Reclassification adjustments, net of taxes	(37)	(7)
Other comprehensive income (loss), net of taxes	43	63
Equity, ending balance	40	104
Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Equity, beginning balance	(3,206)	(2,407)
Other comprehensive income (loss) before reclassification adjustments, pretax	(4)	(35)
Tax	9	(1)
Other comprehensive income (loss) before reclassification adjustments, net of taxes	5	(36)
Reclassification adjustments, pretax	28	7
Tax	(7)	1
Reclassification adjustments, net of taxes	21	8
Other comprehensive income (loss), net of taxes	26	(28)
Equity, ending balance	(3,180)	(2,435)
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Equity, beginning balance	(2,355)	(2,186)
Other comprehensive income (loss) before reclassification adjustments, pretax	263	99
Tax	46	22
Other comprehensive income (loss) before reclassification adjustments, net of taxes	309	121
Reclassification adjustments, pretax	0	0
Tax	0	0
Reclassification adjustments, net of taxes	0	0
Other comprehensive income (loss), net of taxes	309	121
Equity, ending balance	(2,046)	(2,065)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Equity, beginning balance	(5,226)	(4,148)
Other comprehensive income (loss) before reclassification adjustments, pretax	83	(49)
Tax	140	95
Other comprehensive income (loss) before reclassification adjustments, net of taxes	223	46
Reclassification adjustments, pretax	(124)	(147)
Tax	47	55
Reclassification adjustments, net of taxes	(77)	(92)
Other comprehensive income (loss), net of taxes	146	(46)
Equity, ending balance	$ (5,080)	$ (4,194)

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Segment Reporting - Sales of Company's Products (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Sales	$ 9,434	$ 9,312
Proceeds from sale of marketing rights	50	75
corticotropin marketing rights
Segment Reporting Information [Line Items]
Proceeds from sale of marketing rights		75
Operating Segments
Segment Reporting Information [Line Items]
Sales	9,218	9,009
Operating Segments | Total Pharmaceutical segment sales
Segment Reporting Information [Line Items]
Sales	8,185	8,104
Operating Segments | Total Pharmaceutical segment sales | Zetia
Segment Reporting Information [Line Items]
Sales	334	612
Operating Segments | Total Pharmaceutical segment sales | Vytorin
Segment Reporting Information [Line Items]
Sales	241	277
Operating Segments | Total Pharmaceutical segment sales | Liptruzet
Segment Reporting Information [Line Items]
Sales	49	23
Operating Segments | Total Pharmaceutical segment sales | Adempas
Segment Reporting Information [Line Items]
Sales	84	33
Operating Segments | Total Pharmaceutical segment sales | Januvia
Segment Reporting Information [Line Items]
Sales	839	906
Operating Segments | Total Pharmaceutical segment sales | Janumet
Segment Reporting Information [Line Items]
Sales	496	506
Operating Segments | Total Pharmaceutical segment sales | Implanon/Nexplanon
Segment Reporting Information [Line Items]
Sales	170	134
Operating Segments | Total Pharmaceutical segment sales | NuvaRing
Segment Reporting Information [Line Items]
Sales	160	175
Operating Segments | Total Pharmaceutical segment sales | Follistim AQ
Segment Reporting Information [Line Items]
Sales	81	94
Operating Segments | Total Pharmaceutical segment sales | Zepatier
Segment Reporting Information [Line Items]
Sales	378	50
Operating Segments | Total Pharmaceutical segment sales | Isentress
Segment Reporting Information [Line Items]
Sales	305	340
Operating Segments | Total Pharmaceutical segment sales | Bridion
Segment Reporting Information [Line Items]
Sales	148	90
Operating Segments | Total Pharmaceutical segment sales | Noxafil
Segment Reporting Information [Line Items]
Sales	141	145
Operating Segments | Total Pharmaceutical segment sales | Invanz
Segment Reporting Information [Line Items]
Sales	136	114
Operating Segments | Total Pharmaceutical segment sales | Cancidas
Segment Reporting Information [Line Items]
Sales	121	133
Operating Segments | Total Pharmaceutical segment sales | Cubicin
Segment Reporting Information [Line Items]
Sales	96	292
Operating Segments | Total Pharmaceutical segment sales | Primaxin
Segment Reporting Information [Line Items]
Sales	62	73
Operating Segments | Total Pharmaceutical segment sales | Remicade
Segment Reporting Information [Line Items]
Sales	229	349
Operating Segments | Total Pharmaceutical segment sales | Simponi
Segment Reporting Information [Line Items]
Sales	184	188
Operating Segments | Total Pharmaceutical segment sales | Keytruda
Segment Reporting Information [Line Items]
Sales	584	249
Operating Segments | Total Pharmaceutical segment sales | Emend
Segment Reporting Information [Line Items]
Sales	133	126
Operating Segments | Total Pharmaceutical segment sales | Temodar
Segment Reporting Information [Line Items]
Sales	66	66
Operating Segments | Total Pharmaceutical segment sales | Singulair
Segment Reporting Information [Line Items]
Sales	186	237
Operating Segments | Total Pharmaceutical segment sales | Nasonex
Segment Reporting Information [Line Items]
Sales	139	229
Operating Segments | Total Pharmaceutical segment sales | Dulera
Segment Reporting Information [Line Items]
Sales	82	113
Operating Segments | Total Pharmaceutical segment sales | Cozaar/Hyzaar
Segment Reporting Information [Line Items]
Sales	112	126
Operating Segments | Total Pharmaceutical segment sales | Arcoxia
Segment Reporting Information [Line Items]
Sales	103	111
Operating Segments | Total Pharmaceutical segment sales | Fosamax
Segment Reporting Information [Line Items]
Sales	61	75
Operating Segments | Total Pharmaceutical segment sales | Gardasil/Gardasil 9
Segment Reporting Information [Line Items]
Sales	532	378
Operating Segments | Total Pharmaceutical segment sales | ProQuad/M-M-R II/Varivax
Segment Reporting Information [Line Items]
Sales	355	357
Operating Segments | Total Pharmaceutical segment sales | RotaTeq
Segment Reporting Information [Line Items]
Sales	224	188
Operating Segments | Total Pharmaceutical segment sales | Pneumovax 23
Segment Reporting Information [Line Items]
Sales	163	107
Operating Segments | Total Pharmaceutical segment sales | Zostavax
Segment Reporting Information [Line Items]
Sales	154	125
Operating Segments | Total Pharmaceutical segment sales | Other Pharmaceutical
Segment Reporting Information [Line Items]
Sales	1,037	1,083
Operating Segments | Other segment sales
Segment Reporting Information [Line Items]
Sales	1,033	905
Other
Segment Reporting Information [Line Items]
Sales	$ 216	$ 303

XML

Segment Reporting - Reconciliation of Segment Profits to Income Before Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Profits	$ 2,003	$ 1,624
Interest income	97	79
Interest expense	(182)	(172)
Equity income from affiliates	(13)	34
Depreciation and amortization	(1,193)	(1,561)
Research and development	(1,796)	(1,659)
Restructuring costs	(151)	(91)
Total segment profits
Segment Reporting Information [Line Items]
Profits	5,632	5,472
Total segment profits | Pharmaceutical segment
Segment Reporting Information [Line Items]
Profits	5,180	5,117
Total segment profits | Other segments
Segment Reporting Information [Line Items]
Profits	452	355
Other profits
Segment Reporting Information [Line Items]
Profits	142	227
Unallocated
Segment Reporting Information [Line Items]
Interest income	97	79
Interest expense	(182)	(172)
Equity income from affiliates	(12)	20
Depreciation and amortization	(370)	(428)
Research and development	(1,599)	(1,373)
Amortization of purchase accounting adjustments	(778)	(1,133)
Restructuring costs	(151)	(91)
Other unallocated, net	$ (776)	$ (977)