10-K

As filed with the Securities and Exchange Commission on February 26, 2020

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

_________________________________

FORM 10-K

(MARK ONE)

☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the Fiscal Year Ended December 31, 2019

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	New Jersey	07033

(908) 740-4000

New Jersey	22-1918501
(State or other jurisdiction of incorporation)	(I.R.S Employer Identification No.)

Securities Registered pursuant to Section 12(b) of the Act:
Title of Each Class	Trading Symbol(s)	Name of Each Exchange on which Registered
Common Stock ($0.50 par value)	MRK	New York Stock Exchange
1.125% Notes due 2021	MRK/21	New York Stock Exchange
0.500% Notes due 2024	MRK 24	New York Stock Exchange
1.875% Notes due 2026	MRK/26	New York Stock Exchange
2.500% Notes due 2034	MRK/34	New York Stock Exchange
1.375% Notes due 2036	MRK 36A	New York Stock Exchange

Number of shares of Common Stock ($0.50 par value) outstanding as of January 31, 2020: 2,536,268,760.

Aggregate market value of Common Stock ($0.50 par value) held by non-affiliates on June 30, 2019 based on closing price on June 30, 2019: $215,106,000,000.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.     Yes ☒    No ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes ☐    No ☒

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 every Interactive Data File required to be submitted 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 such files).    Yes  ☒ No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a 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	☐	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  ☒

Documents Incorporated by Reference:
Document	Part of Form 10-K
Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020, to be filed with the Securities and Exchange Commission within 120 days after the close of the fiscal year covered by this report	Part III

Table of Contents

			Page
Part I
Item 1.	Business		1
Item 1A.	Risk Factors		20
	Cautionary Factors that May Affect Future Results		32
Item 1B.	Unresolved Staff Comments		33
Item 2.	Properties		33
Item 3.	Legal Proceedings		34
Item 4.	Mine Safety Disclosures		34
	Executive Officers of the Registrant		35
Part II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities		36
Item 6.	Selected Financial Data		38
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		39
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk		69
Item 8.	Financial Statements and Supplementary Data		70
	(a)	Financial Statements	70
		Notes to Consolidated Financial Statements	74
		Report of Independent Registered Public Accounting Firm	124
	(b)	Supplementary Data	126
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure		127
Item 9A.	Controls and Procedures		127
	Management’s Report		127
Item 9B.	Other Information		128
Part III
Item 10.	Directors, Executive Officers and Corporate Governance		129
Item 11.	Executive Compensation		129
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters		130
Item 13.	Certain Relationships and Related Transactions, and Director Independence		130
Item 14.	Principal Accountant Fees and Services		130
Part IV
Item 15.	Exhibits and Financial Statement Schedules		131
Item 16.	Form 10-K Summary		135
	Signatures		136

PART I

Item 1. Business.

Merck & Co., Inc. (Merck or the Company) is a global health care company that delivers innovative health solutions through its prescription medicines, vaccines, biologic therapies and animal health products. The Company’s operations are principally managed on a products basis and include four operating segments, which are the Pharmaceutical, Animal Health, Healthcare Services and Alliances segments.

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. Human health 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.

The Animal Health segment discovers, develops, manufactures and markets a wide range of veterinary pharmaceutical and vaccine products, as well as health management solutions and services, for the prevention, treatment and control of disease in all major livestock and companion animal species. The Company also offers an extensive suite of digitally connected identification, traceability and monitoring products. The Company sells its products to veterinarians, distributors and animal producers.

The 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. The Company has recently sold certain businesses in the Healthcare Services segment and is in the process of divesting the remaining businesses. While the Company continues to look for investment opportunities in this area of health care, the approach to these investments has shifted toward venture capital investments in third parties as opposed to wholly-owned businesses.

The Alliances segment primarily includes activity from the Company’s relationship with AstraZeneca LP related to sales of Nexium and Prilosec, which concluded in 2018.

The Company was incorporated in New Jersey in 1970.

All product or service marks appearing in type form different from that of the surrounding text are trademarks or service marks owned, licensed to, promoted or distributed by Merck, its subsidiaries or affiliates, except as noted. All other trademarks or services marks are those of their respective owners.

Planned Spin-Off of Women’s Health, Legacy Brands and Biosimilars into a New Company    

In February 2020, Merck announced its intention to spin-off (the Spin-Off) products from its women’s health, trusted legacy brands and biosimilars businesses into a new, yet-to-be-named, independent, publicly traded company (NewCo) through a distribution of NewCo’s publicly traded stock to Company shareholders. The distribution is expected to qualify as tax-free to the Company and its shareholders for U.S. federal income tax purposes. The legacy brands included in the transaction consist of dermatology, pain, respiratory, and select cardiovascular products including Zetia and Vytorin, as well as the rest of Merck’s diversified brands franchise. Merck’s existing research pipeline programs will continue to be owned and developed within Merck as planned. NewCo will have development capabilities initially focused on late-stage development and life-cycle management, and is expected over time to develop research capabilities in selected therapeutic areas. The Spin-Off is expected to be completed in the first half of 2021, subject to market and certain other conditions. See “Risk Factors - Risks Related to the Proposed Spin-Off of NewCo.”

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Product Sales

Total Company sales, including sales of the Company’s top pharmaceutical products, as well as sales of animal health products, were as follows:

($ in millions)	2019		2018		2017
Total Sales	$	46,840	$	42,294	$	40,122
Pharmaceutical	41,751		37,689		35,390
Keytruda	11,084		7,171		3,809
Januvia/Janumet	5,524		5,914		5,896
Gardasil/Gardasil 9	3,737		3,151		2,308
ProQuad/M-M-R II/Varivax	2,275		1,798		1,676
Bridion	1,131		917		704
Isentress/Isentress HD	975		1,140		1,204
Pneumovax 23	926		907		821
NuvaRing	879		902		761
Zetia/Vytorin	874		1,355		2,095
Simponi	830		893		819
Animal Health	4,393		4,212		3,875
Livestock	2,784		2,630		2,484
Companion Animals	1,609		1,582		1,391
Other Revenues(1)	696		393		857

⁽¹⁾  Other revenues are primarily comprised of Healthcare Services segment revenue, third-party manufacturing sales, and miscellaneous corporate revenues, including revenue hedging activities.

Pharmaceutical

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. Human health vaccine products consist of preventive pediatric, adolescent and adult vaccines, primarily administered at physician offices. Certain of the products within the Company’s franchises are as follows:

Oncology

Keytruda (pembrolizumab), the Company’s anti-PD-1 (programmed death receptor-1) therapy, as monotherapy for the treatment of certain patients with melanoma, non-small-cell lung cancer (NSCLC), small-cell lung cancer (SCLC), head and neck squamous cell carcinoma (HNSCC), classical Hodgkin Lymphoma (cHL), primary mediastinal large B-cell lymphoma (PMBCL), urothelial carcinoma, microsatellite instability-high (MSI-H) or mismatch repair deficient cancer, gastric or gastroesophageal junction adenocarcinoma, esophageal cancer, cervical cancer, hepatocellular carcinoma, and merkel cell carcinoma. Keytruda is also used for the treatment of certain patients in combination with chemotherapy for metastatic squamous and non-squamous NSCLC, in combination with chemotherapy for HNSCC, in combination with axitinib for renal cell carcinoma, and in combination with lenvatinib for endometrial carcinoma; and Emend (aprepitant) for the prevention of chemotherapy-induced and post-operative nausea and vomiting. In addition, the Company recognizes alliance revenue related to sales of Lynparza (olaparib), an oral poly (ADP-ribose) polymerase (PARP) inhibitor, for certain types of advanced ovarian, breast and pancreatic cancers; and Lenvima (lenvatinib) for certain types of thyroid cancer, hepatocellular carcinoma, in combination with everolimus for certain patients with renal cell carcinoma, and in combination with Keytruda for certain patients with endometrial carcinoma.

Vaccines

Gardasil (Human Papillomavirus Quadrivalent [Types 6, 11, 16 and 18] Vaccine, Recombinant)/Gardasil 9 (Human Papillomavirus 9-valent Vaccine, Recombinant), vaccines to help prevent certain diseases caused by certain types of human papillomavirus (HPV); ProQuad (Measles, Mumps, Rubella and Varicella Virus Vaccine Live), a pediatric combination vaccine to help protect against measles, mumps, rubella and varicella; M-M-R II (Measles, Mumps and Rubella Virus Vaccine Live), a vaccine to help prevent measles, mumps and rubella; Varivax (Varicella Virus Vaccine Live), a vaccine to help prevent chickenpox (varicella); Pneumovax 23 (pneumococcal vaccine polyvalent), a vaccine to help prevent pneumococcal disease; RotaTeq (Rotavirus Vaccine, Live Oral, Pentavalent), a vaccine to help protect against rotavirus gastroenteritis in infants and children; and Vaqta (hepatitis A vaccine, inactivated) indicated for the prevention of disease caused by hepatitis A virus in persons 12 months of age and older.

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Hospital Acute Care

Bridion (sugammadex) Injection, a medication for the reversal of two types of neuromuscular blocking agents used during surgery; Noxafil (posaconazole) for the prevention of invasive fungal infections; Primaxin (imipenem and cilastatin sodium) an anti-bacterial product; Invanz (ertapenem sodium) for the treatment of certain infections; Cubicin (daptomycin for injection), an I.V. antibiotic for complicated skin and skin structure infections or bacteremia, when caused by designated susceptible organisms; Cancidas (caspofungin acetate), an anti-fungal product; and Prevymis (letermovir) for the prophylaxis of cytomegalovirus (CMV) reactivation and disease in adult CMV-seropositive recipients [R+] of an allogeneic hematopoietic stem cell transplant.

Immunology

Simponi (golimumab), a once-monthly subcutaneous treatment for certain inflammatory diseases; and Remicade (infliximab), a treatment for inflammatory diseases, which the Company markets in Europe, Russia and Turkey.

Neuroscience

Belsomra (suvorexant), an orexin receptor antagonist indicated for the treatment of insomnia, characterized by difficulties with sleep onset and/or sleep maintenance.

Virology

Isentress/Isentress HD (raltegravir), an HIV integrase inhibitor for use in combination with other antiretroviral agents for the treatment of HIV-1 infection; and Zepatier (elbasvir and grazoprevir) for the treatment of adult patients with chronic hepatitis C virus (HCV) genotype (GT) 1 or GT4 infection, with ribavirin in certain patient populations.

Cardiovascular

Zetia (ezetimibe) (marketed as Ezetrol in most countries outside the United States); Vytorin (ezetimibe/simvastatin) (marketed as Inegy outside the United States); Atozet (ezetimibe and atorvastatin) (marketed outside of the United States) and Rosuzet (ezetimibe and rosuvastatin) (marketed outside of the United States), cholesterol modifying medicines; and Adempas (riociguat), a cardiovascular drug for the treatment of pulmonary arterial hypertension.

Diabetes

Januvia (sitagliptin) and Janumet (sitagliptin/metformin HCl) for the treatment of type 2 diabetes.

Women’s Health

NuvaRing (etonogestrel/ethinyl estradiol vaginal ring), a vaginal contraceptive product; and Implanon (etonogestrel implant), a single-rod subdermal contraceptive implant/Nexplanon (etonogestrel implant), a single, radiopaque, rod-shaped subdermal contraceptive implant.

Animal Health

The Animal Health segment discovers, develops, manufactures and markets a wide range of veterinary pharmaceuticals, vaccines and health management solutions and services, as well as an extensive suite of digitally connected identification, traceability and monitoring products. Principal products in this segment include:

Livestock Products

Nuflor (Florfenicol) antibiotic range for use in cattle and swine; Bovilis/Vista vaccine lines for infectious diseases in cattle; Banamine (Flunixin meglumine) bovine and swine anti-inflammatory; Estrumate (cloprostenol sodium) for the treatment of fertility disorders in cattle; Matrix (altrenogest) fertility management for swine; Resflor (florfenicol and flunixin meglumine), a combination broad-spectrum antibiotic and non-steroidal anti-inflammatory drug for bovine respiratory disease; Zuprevo (Tildipirosin) for bovine respiratory disease; Zilmax (zilpaterol hydrochloride) and Revalor (trenbolone acetate and estradiol) to improve production efficiencies in beef cattle; Safe-Guard (fenbendazole) de-wormer for cattle; M+Pac (Mycoplasma Hyopneumoniae Bacterin) swine pneumonia vaccine; Porcilis (Lawsonia intracellularis baterin) and Circumvent (Porcine Circovirus Vaccine, Type 2, Killed Baculovirus Vector) vaccine lines for infectious diseases in swine; Nobilis/Innovax (Live Marek’s Disease Vector), vaccine lines for poultry; Paracox and Coccivac coccidiosis vaccines; Exzolt, a systemic treatment for poultry red mite infestations; Slice (Emamectin benzoate) parasiticide for sea lice in salmon; Aquavac (Avirulent Live Culture)/Norvax vaccines against bacterial and viral disease in fish; Compact PD vaccine for salmon; Aquaflor (Florfenicol) antibiotic for farm-raised fish; and Allflex Livestock Intelligence solutions for animal identification, monitoring and traceability.

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Companion Animal Products

Bravecto (fluralaner), a line of oral and topical parasitic control products for dogs and cats that last up to 12 weeks; Nobivac vaccine lines for flexible dog and cat vaccination; Otomax (Gentamicin sulfate, USP; Betamethasone valerate USP; and Clotrimazole USP ointment)/Mometamax (Gentamicin sulfate, USP, Mometasone Furoate Monohydrate and Clotrimazole, USP, Otic Suspension)/Posatex (Orbifloxacin, Mometasone Furoate Monohydrate and Posaconazole, Suspension) ear ointments for acute and chronic otitis; Caninsulin/Vetsulin (porcine insulin zinc suspension) diabetes mellitus treatment for dogs and cats; Panacur (fenbendazole)/Safeguard (fenbendazole) broad-spectrum anthelmintic (de-wormer) for use in many animals; Regumate (altrenogest) fertility management for horses; Prestige vaccine line for horses; and Scalibor (Deltamethrin)/Exspot for protecting against bites from fleas, ticks, mosquitoes and sandflies.

For a further discussion of sales of the Company’s products, see Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” below.

2019 Product Approvals

Set forth below is a summary of significant product approvals received by the Company in 2019.

Product	Date	Approval
Ervebo	December 2019	The U.S. Food and Drug Administration (FDA) approved Ervebo for the prevention of disease caused by Zaire ebolavirus in individuals 18 years of age and older.
	November 2019	The European Commission (EC) granted a conditional marketing authorization for Ervebo for active immunization of individuals 18 years of age or older to protect against Ebola Virus Disease caused by Zaire Ebola virus.
Keytruda	December 2019	The Japanese Ministry of Health, Labour and Welfare (MHLW) approved Keytruda for three new first-line indications across advanced renal cell carcinoma (RCC) and recurrent or distant metastatic head and neck cancer.
	November 2019	EC approved two new regimens of Keytruda as first-line treatment for metastatic or unresectable recurrent head and neck squamous cell carcinoma (HNSCC).
	November 2019	The China National Medical Products Administration (NMPA) approved Keytruda for first-line treatment of metastatic squamous non-small cell lung cancer (NSCLC) in combination with chemotherapy.
	October 2019	NMPA approved Keytruda as monotherapy for first-line treatment of certain patients with advanced NSCLC whose tumors express PD-L1.
	September 2019	FDA approved Keytruda plus Lenvima combination treatment for patients with certain types of endometrial carcinoma.
	September 2019	EC approved Keytruda in combination with axitinib as first-line treatment for patients with advanced RCC.
	July 2019	FDA approved Keytruda for recurrent locally advanced or metastatic squamous cell carcinoma of the esophagus in patients whose tumors express PD-L1 combined positive score [CPS] (CPS ≥10) with disease progression after one of more prior lines of systemic therapy.

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Keytruda	June 2019	FDA approved Keytruda as monotherapy for patients with metastatic small-cell lung cancer (SCLC) with disease progression on or after platinum-based chemotherapy and at least one other prior line of therapy.
	June 2019	FDA approved two indications for Keytruda for first-line treatment of patients with metastatic or with unresectable, recurrent HNSCC as monotherapy for patients whose tumors express PD-L1 CPS ≥1 or in combination with platinum and fluorouracil regardless of PD-L1 expression.
	April 2019	FDA approved Keytruda in combination with axitinib for first-line treatment of patients with advanced RCC.
	April 2019	FDA approved an expanded label for Keytruda as monotherapy for the first-line treatment of patients with stage III NSCLC who are not candidates for surgical resection or definitive chemoradiation, or metastatic NSCLC, and whose tumors express PD-L1 (tumor proportion score [TPS] ≥1%) as determined by an FDA-approved test, with no epidermal growth factor receptor​ (EGFR) or anaplastic lymphoma kinase positive (ALK) genomic tumor aberrations.
	April 2019	EC approved new extended dosing schedule for Keytruda for all approved monotherapy indications.
	April 2019	NMPA approved Keytruda for first-line treatment of metastatic nonsquamous NSCLC in combination with chemotherapy.
	March 2019	EC approved Keytruda in combination with chemotherapy for first-line treatment of adults with metastatic squamous NSCLC.
	February 2019	FDA approved Keytruda for the adjuvant treatment of patients with melanoma with involvement of lymph node(s) following complete resection.
	January 2019	MHLW approved Keytruda for five indications, including three expanded uses in advanced NSCLC, one in melanoma, as well as a new indication in advanced microsatellite instability-high tumors.
Lynparza(1)	December 2019	FDA approved Lynparza for first-line maintenance therapy for patients with germline BRCA-mutated (gBRCA-m) metastatic pancreatic cancer whose disease has not progressed for at least 16 weeks of a first-line, platinum-based chemotherapy regimen.
	December 2019	NMPA approved Lynparza as a first-line maintenance therapy in BRCA-m advanced ovarian cancer.
	July 2019	EC approved Lynparza as monotherapy for the maintenance treatment of adult patients with advanced BRCA-m, high-grade epithelial ovarian, fallopian tube or primary peritoneal cancer.
	June 2019	MHLW approved Lynparza as first-line maintenance therapy in patients with BRCA-m advanced ovarian cancer.
	June 2019	EC approved Lynparza for use as first-line maintenance therapy in patients with BRCA-m advanced ovarian cancer.
	April 2019	EC approved Lynparza for the treatment of gBRCA-m HER2-negative advanced breast cancer.
Pifeltro and Delstrigo	September 2019	FDA approved supplemental New Drug Applications (sNDAs) for Pifeltro (doravirine) in combination with other antiretroviral agents, and Delstrigo (doravirine, lamivudine, and tenofovir disoproxil fumarate) as a complete regimen, for use in appropriate adults with HIV-1 infection who are virologically suppressed on a stable antiretroviral regimen.

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Recarbrio	July 2019	FDA approved Recarbrio (imipenem, cilastatin, and relebactam) for the treatment of adults with complicated urinary tract and complicated intra-abdominal bacterial infections where limited or no alternative treatment options are available.
Zerbaxa	August 2019	EC approved Zerbaxa for the treatment of adults with hospital-acquired pneumonia, including ventilator-associated pneumonia (to be used in combination with an antibacterial agent active against Gram-positive pathogens when these are known or suspected to be contributing to the infectious process.)
	June 2019	FDA approved Zerbaxa 3g dose for the treatment of patients 18 years and older with hospital-acquired bacterial pneumonia and ventilator-associated bacterial pneumonia (HABP/VABP).
Bravecto	November 2019	FDA approved Bravecto Plus topical solution for cats indicated for both external and internal parasite infestations.

⁽¹⁾  In July 2017, Merck and AstraZeneca entered into a global strategic oncology collaboration to co-develop and co-commercialize AstraZeneca’s Lynparza.

Competition and the Health Care Environment

Competition

The markets in which the Company conducts its business and the pharmaceutical industry in general are highly competitive and highly regulated. The Company’s competitors include other worldwide research-based pharmaceutical companies, smaller research companies with more limited therapeutic focus, generic drug manufacturers and animal health care companies. The Company’s operations may be adversely affected by generic and biosimilar competition as the Company’s products mature, as well as technological advances of competitors, industry consolidation, patents granted to competitors, competitive combination products, new products of competitors, the generic availability of competitors’ branded products, and new information from clinical trials of marketed products or post-marketing surveillance. In addition, patent rights are increasingly being challenged by competitors, and the outcome can be highly uncertain. An adverse result in a patent dispute can preclude commercialization of products or negatively affect sales of existing products and could result in the payment of royalties or in the recognition of an impairment charge with respect to intangible assets associated with certain products. Competitive pressures have intensified as pressures in the industry have grown.

Pharmaceutical competition involves a rigorous search for technological innovations and the ability to market these innovations effectively. With its long-standing emphasis on research and development, the Company is well-positioned to compete in the search for technological innovations. Additional resources required to meet market challenges include quality control, flexibility to meet customer specifications, an efficient distribution system and a strong technical information service. The Company is active in acquiring and marketing products through external alliances, such as licensing arrangements and collaborations, and has been refining its sales and marketing efforts to address changing industry conditions. However, the introduction of new products and processes by competitors may result in price reductions and product displacements, even for products protected by patents. For example, the number of compounds available to treat a particular disease typically increases over time and can result in slowed sales growth or reduced sales for the Company’s products in that therapeutic category.

The highly competitive animal health business is affected by several factors including regulatory and legislative issues, scientific and technological advances, product innovation, the quality and price of the Company’s products, effective promotional efforts and the frequent introduction of generic products by competitors.

Health Care Environment and Government Regulation

Global efforts toward health care cost containment continue to exert pressure on product pricing and market access. In the United States, federal and state governments for many years also have pursued methods to reduce the cost of drugs and vaccines for which they pay. For example, federal laws require the Company to pay specified rebates for medicines reimbursed by Medicaid and to provide discounts for outpatient medicines purchased by certain Public Health Service entities and hospitals serving a disproportionate share of low income or uninsured patients.

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Against this backdrop, the United States enacted major health care reform legislation in 2010 (the Patient Protection and Affordable Care Act (ACA)). Various insurance market reforms have since advanced and state and federal insurance exchanges were launched in 2014. With respect to the effect of the law on the pharmaceutical industry, the law increased the mandated Medicaid rebate from 15.1% to 23.1%, expanded the rebate to Medicaid managed care utilization, and increased the types of entities eligible for the federal 340B drug discount program. The law also required pharmaceutical manufacturers to pay a 50% point of service discount to Medicare Part D beneficiaries when they are in the Medicare Part D coverage gap (i.e., the so-called “donut hole”). As a result of the Balanced Budget Act of 2018 and effective at the beginning of 2019, the 50% point of service discount increased to a 70% point of service discount in the coverage gap. In addition, this point of service discount was extended to biosimilar products. Merck recorded a reduction to revenue of approximately $615 million, $365 million and $385 million in 2019, 2018 and 2017, respectively, related to the donut hole provision. Also, pharmaceutical manufacturers are required to pay an annual non-tax deductible health care reform fee. The total annual industry fee was $4.1 billion in 2018 and decreased to $2.8 billion in 2019 and is expected to remain at that amount for 2020. The fee is assessed on each company in proportion to its share of prior year branded pharmaceutical sales to certain government programs, such as Medicare and Medicaid. The Company recorded $112 million, $124 million and $210 million of costs within Selling, general and administrative expenses in 2019, 2018 and 2017, respectively, for the annual health care reform fee. In February 2016, the Centers for Medicare & Medicaid Services (CMS) issued the Medicaid rebate final rule that implements provisions of the ACA effective April 1, 2016. The rule provides comprehensive guidance on the calculation of Average Manufacturer Price and Best Price; two metrics utilized to determine the rebates drug manufacturers are required to pay to state Medicaid programs. The impact of changes resulting from the issuance of the rule is not material to Merck at this time. However, the Company is still awaiting guidance from CMS on two aspects of the rule that were deferred for later implementation. These include a definition of what constitutes a product ‘line extension’ and a delay in the participation of the U.S. Territories in the Medicaid Drug Rebate Program until April 1, 2022. The Company will evaluate the financial impact of these two elements when they become effective.

There is significant uncertainty about the future of the ACA in particular and health care laws in general in the United States. The Company is participating in the debate, and monitoring how any proposed changes could affect its business. The Company is unable to predict the likelihood of changes to the ACA. Depending on the nature of any repeal and replacement of the ACA, such actions could have a material adverse effect on the Company’s business, cash flow, results of operations, financial condition and prospects.

A number of states have passed pharmaceutical price and cost transparency laws. These laws typically require manufacturers to report certain product price information or other financial data to the state. Some laws also require manufacturers to provide advance notification of price increases. The Company expects that states will continue their focus on pharmaceutical price transparency and that this focus will continue to exert pressure on product pricing.

The Company also faces increasing pricing pressure globally from managed care organizations, government agencies and programs that could negatively affect the Company’s sales and profit margins. In the United States, these include (i) practices of managed care organizations, federal and state exchanges, and institutional and governmental purchasers, and (ii) U.S. federal laws and regulations related to Medicare and Medicaid, including the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 and the ACA.

Changes to the health care system enacted as part of health care reform in the United States, as well as increased purchasing power of entities that negotiate on behalf of Medicare, Medicaid, and private sector beneficiaries, could result in further pricing pressures. As an example, 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.

The pharmaceutical industry could be considered a potential source of savings via legislative proposals that have been debated but not enacted. These types of revenue generating or cost saving proposals include additional direct price controls. In addition, Congress and/or the administration may again consider proposals to allow international reference pricing or, under certain conditions, the importation of medicines from other countries.

The administration has recently proposed a draft rule that would allow importation of certain lower-cost prescription drugs from Canada. If the rule is finalized as proposed, states or certain other non-federal governmental entities would be able to submit importation program proposals to the FDA for review and authorization of two-year programs (with the opportunity to extend for two more years). There will be a public comment period on the proposed rule which will expire on March 9, 2020. Following the comment period, the FDA will have to review and finalize its

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proposal before any states or other parties can submit their plans to comply with the federal rule. If the proposed rule is adopted, it likely will be some time before states or other parties can actually implement importation plans.

In October 2018, the administration also issued an advance notice of proposed rulemaking to implement an “International Pricing Index” (IPI) model in the United States for products covered under Medicare Part B. The proposal would: (1) reduce Medicare Part B payments for drugs based on a market basket of international prices; (2) allow private sector vendors to negotiate prices for drugs, take title to drugs, and compete for physician and hospital business; and (3) change the physician reimbursement under Medicare Part B from the current model to eliminate the buy and bill system and instead pay physicians based on a flat fee that approximates the revenue they currently receive from drugs. Public comments on the IPI proposal were accepted through late 2018 and it is unclear when the agency may issue a proposed rule on the IPI model. Adoption of one or both of the proposed rules could have a material adverse effect on the Company’s business, results of operations and financial condition.

It remains uncertain as to what proposals, if any, may be included as part of future federal legislative proposals that would directly or indirectly affect the Company.

In the U.S. private sector, consolidation and integration among health care providers is a major factor in the competitive marketplace for pharmaceutical products. Health plans and pharmacy benefit managers have been consolidating into fewer, larger entities, thus enhancing their purchasing strength and importance. Private third-party insurers, as well as governments, increasingly employ formularies to control costs by negotiating discounted prices in exchange for formulary inclusion. Failure to obtain timely or adequate pricing or formulary placement for Merck’s products or obtaining such placement at unfavorable pricing could adversely impact revenue. In addition to formulary tier co-pay differentials, private health insurance companies and self-insured employers have been raising co-payments required from beneficiaries, particularly for branded pharmaceuticals and biotechnology products. Private health insurance companies also are increasingly imposing utilization management tools, such as clinical protocols, requiring prior authorization for a branded product if a generic product is available or requiring the patient to first fail on one or more generic products before permitting access to a branded medicine. These same management tools are also used in treatment areas in which the payer has taken the position that multiple branded products are therapeutically comparable. As the U.S. payer market concentrates further and as more drugs become available in generic form, pharmaceutical companies may face greater pricing pressure from private third-party payers.

In order to provide information about the Company’s pricing practices, the Company annually posts on its website its Pricing Transparency Report for the United States. The report provides the Company’s average annual list price, net price increases, and average discounts across the Company’s U.S. portfolio dating back to 2010. In 2019, the Company’s gross U.S. sales were reduced by approximately 44% as a result of rebates, discounts and returns. 

Efforts toward health care cost containment also remain intense in European countries. The Company faces competitive pricing pressure resulting from generic and biosimilar drugs. In addition, a majority of countries in Europe attempt to contain drug costs by engaging in reference pricing in which authorities examine pre-determined markets for published prices of drugs by brand. The authorities then use price data from those markets to set new local prices for brand-name drugs, including the Company’s drugs. Guidelines for examining reference pricing are usually set in local markets and can be changed pursuant to local regulations.

In addition, in Japan, the pharmaceutical industry is subject to government-mandated biennial price reductions of pharmaceutical products and certain vaccines, which occurred in 2018 and will occur again in 2020. Furthermore, the government can order re-pricings for specific products if it determines that use of such product will exceed certain thresholds defined under applicable re-pricing rules. Pursuant to those rules, the Japanese government reduced the price of Keytruda by 17.5% effective February 2020. Additionally, Keytruda will be subject to another significant price reduction in April 2020 under a provision of the Japanese pricing rules.

The Company’s business in China has grown rapidly in the past few years, and the importance of China to the Company’s overall pharmaceutical and vaccines business has increased accordingly. Continued growth of the Company’s business in China is dependent upon ongoing development of a favorable environment for innovative pharmaceutical products and vaccines, sustained access for the Company’s current in-line products, and the absence of trade impediments or adverse pricing controls. In recent years, the Chinese government has introduced and implemented a number of structural reforms to accelerate the shift to innovative products and reduce costs. Since 2017, there have been multiple new policies introduced by the government to improve access to new innovation, reduce the

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complexity of regulatory filings, and accelerate the review and approval process. This has led to a significant increase in the number of new products being approved each year. Additionally, in 2017, the Chinese government updated the National Reimbursement Drug List for the first time in eight years. While the mechanism for drugs being added to the list evolves, inclusion may require a price negotiation which could impact the outlook in the market for selected brands. In 2019, drugs were added through two pathways, direct inclusion and price negotiations. For price negotiations, price reductions of approximately 60% on average were required for inclusion. While pricing pressure has always existed in China, health care reform has increased this pressure in part due to the acceleration of generic substitution through volume based procurement (VBP). In 2019, the government implemented the VBP program through a tendering process for mature products which have generic substitutes with a Generic Quality Consistency Evaluation approval. Mature products that have entered into the first two rounds of VBP have had, on average, a price reduction of 50%. The expansion of the VBP program remains to be seen.

The Company’s focus on emerging markets, in addition to China, has continued. Governments in many emerging markets are also focused on constraining health care costs and have enacted price controls and related measures, such as compulsory licenses, that aim to put pressure on the price of pharmaceuticals and constrain market access. The Company anticipates that pricing pressures and market access challenges will continue in 2020 to varying degrees in the emerging markets, including China.

Certain markets outside of the United States have also implemented other cost management strategies, such as health technology assessments (HTA). Examples include the UK, France, Germany, Ireland, Italy and Sweden. The HTA process is the procedure according to which the assessment of the public health impact, therapeutic impact, and the economic and social impact of use of a given medicinal product in the national health care system of the individual country is conducted. HTAs generally focus on the clinical efficacy and effectiveness, safety, cost, and cost-effectiveness of individual medicinal products as well as their potential implications for the health care system. Those elements of medicinal products are compared with other treatment options available on the market. The outcome of HTAs will often influence the pricing and reimbursement status granted to medicinal products by the regulatory authorities of individual European Union (EU) Member States. A negative HTA of one of the Company’s products by a leading and recognized HTA body could undermine the Company’s ability to obtain reimbursement for such product in the EU Member State in which such negative assessment was issued, and also in other EU Member States. HTA procedures require additional data, reviews and administrative processes, all of which increase the complexity, timing and costs of obtaining product reimbursement and exert downward pressure on available reimbursement. In the United States, HTAs are also being used by government and private payers.

Beyond pricing and market access challenges, other conditions in emerging market countries can affect the Company’s efforts to continue to grow in these markets, including potential political instability, changes in trade sanctions and embargoes, significant currency fluctuation and controls, financial crises, limited or changing availability of funding for health care, and other developments that may adversely impact the business environment for the Company. Further, the Company may engage third-party agents to assist in operating in emerging market countries, which may affect its ability to realize continued growth and may also increase the Company’s risk exposure.

In addressing cost containment pressures, the Company engages in public policy advocacy with policymakers and continues to work to demonstrate that its medicines provide value to patients and to those who pay for health care. The Company advocates with government policymakers to encourage a long-term approach to sustainable health care financing that ensures access to innovative medicines and does not disproportionately target pharmaceuticals as a source of budget savings. In markets with historically low rates of health care spending, the Company encourages those governments to increase their investments and adopt market reforms in order to improve their citizens’ access to appropriate health care, including medicines.

Operating conditions have become more challenging under the global pressures of competition, industry regulation and cost containment efforts. Although no one can predict the effect of these and other factors on the Company’s business, the Company continually takes measures to evaluate, adapt and improve the organization and its business practices to better meet customer needs and believes that it is well-positioned to respond to the evolving health care environment and market forces.

The pharmaceutical industry is also subject to regulation by regional, country, state and local agencies around the world focused on standards and processes for determining drug safety and effectiveness, as well as conditions for sale or reimbursement.

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Of particular importance is the FDA in the United States, which administers requirements covering the testing, approval, safety, effectiveness, manufacturing, labeling, and marketing of prescription pharmaceuticals. In some cases, the FDA requirements and practices have increased the amount of time and resources necessary to develop new products and bring them to market in the United States. At the same time, the FDA has committed to expediting the development and review of products bearing the “breakthrough therapy” designation, which has accelerated the regulatory review process for medicines with this designation. The FDA has also undertaken efforts to bring generic competition to market more efficiently and in a more timely manner.

The EU has adopted directives and other legislation concerning the classification, labeling, advertising, wholesale distribution, integrity of the supply chain, enhanced pharmacovigilance monitoring and approval for marketing of medicinal products for human use. These provide mandatory standards throughout the EU, which may be supplemented or implemented with additional regulations by the EU member states. In particular, EU regulators may approve products subject to a number of post-authorization conditions. Examples of typical post-authorization commitments include additional pharmacovigilance, the conduct of clinical trials, the establishment of patient registries, physician or patient education and controlled distribution and prescribing arrangements. Non-compliance with post-authorization conditions, pharmacovigilance and other obligations can lead to regulatory action, including the variation, suspension or withdrawal of the marketing authorizations, or other enforcement or regulatory actions, including the imposition of financial penalties. The Company’s policies and procedures are already consistent with the substance of these directives; consequently, it is believed that they will not have any material effect on the Company’s business.

The Company believes that it will continue to be able to conduct its operations, including launching new drugs, in this regulatory environment. (See “Research and Development” below for a discussion of the regulatory approval process.)

Access to Medicines

As a global health care company, Merck’s primary role is to discover and develop innovative medicines and vaccines. The Company also recognizes that it has an important role to play in helping to improve access to its medicines, vaccines, and to quality health care around the world. The Company’s efforts in this regard are wide-ranging and include a set of principles that the Company strives to embed into its operations and business strategies to guide the Company’s worldwide approach to expanding access to health care. In addition, through innovative social investments, including philanthropic programs and impact investing, Merck is also helping to strengthen health systems and build capacity, particularly in under-resourced communities. The Merck Patient Assistance Program provides medicines and adult vaccines for free to people in the United States who do not have prescription drug or health insurance coverage and who, without the Company’s assistance, cannot afford their Merck medicines and vaccines. In 2011, Merck launched “Merck for Mothers,” a long-term effort with global health partners to end preventable deaths from complications of pregnancy and childbirth. Merck has also provided funds to the Merck Foundation, an independent grantmaking organization, which has partnered with a variety of organizations dedicated to improving global health.

Privacy and Data Protection

The Company is subject to a significant number of privacy and data protection laws and regulations globally, many of which place restrictions on the Company’s ability to transfer, access and use personal data across its business. The legislative and regulatory landscape for privacy and data protection continues to evolve. There has been increased attention to privacy and data protection issues in both developed and emerging markets with the potential to affect directly the Company’s business, including both the EU General Data Protection Regulation, which went into effect on May 25, 2018 and imposes penalties of up to 4% of global revenue, and the California Consumer Privacy Act, which became effective January 1, 2020. Additional laws and regulations enacted in the United States, Europe, Asia and Latin America, increased enforcement and litigation activity in the United States and other developed markets, and increased regulatory cooperation among privacy authorities globally. The Company has adopted a comprehensive global privacy program to manage these evolving risks which has been certified as compliant with and approved by the Asia Pacific Economic Cooperation Cross-Border Privacy Rules System, the EU-U.S. and Swiss-U.S. Privacy Shield Programs, and the Binding Corporate Rules in the EU.

Distribution

The Company sells its human health pharmaceutical products primarily to drug wholesalers and retailers, hospitals, government agencies and managed health care providers, such as health maintenance organizations, pharmacy

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benefit managers and other institutions. Human health vaccines are sold primarily to physicians, wholesalers, physician distributors and government entities. The Company’s professional representatives communicate the effectiveness, safety and value of the Company’s pharmaceutical and vaccine products to health care professionals in private practice, group practices, hospitals and managed care organizations. The Company sells its animal health products to veterinarians, distributors and animal producers.

Raw Materials

Raw materials and supplies, which are generally available from multiple sources, are purchased worldwide and are normally available in quantities adequate to meet the needs of the Company’s business.

Patents, Trademarks and Licenses

Patent protection is considered, in the aggregate, to be of material importance to the Company’s marketing of its products in the United States and in most major foreign markets. Patents may cover products per se, pharmaceutical formulations, processes for, or intermediates useful in, the manufacture of products, or the uses of products. Protection for individual products extends for varying periods in accordance with the legal life of patents in the various countries. The protection afforded, which may also vary from country to country, depends upon the type of patent and its scope of coverage.

The Food and Drug Administration Modernization Act includes a Pediatric Exclusivity Provision that may provide an additional six months of market exclusivity in the United States for indications of new or currently marketed drugs if certain agreed upon pediatric studies are completed by the applicant. Current U.S. patent law provides additional patent term for periods when the patented product was under regulatory review by the FDA. The EU also provides an additional six months of pediatric market exclusivity attached to a product’s Supplementary Protection Certificate (SPC). Japan provides the additional term for pediatric studies attached to market exclusivity unrelated to patent term.

Patent portfolios developed for products introduced by the Company normally provide market exclusivity. The Company has the following key patent protection in the United States, the EU, Japan and China (including the potential for patent term extensions (PTE) and SPCs where indicated) for the following marketed products:

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Product	Year of Expiration (U.S.)	Year of Expiration (EU)(1)	Year of Expiration (Japan)(2)	Year of Expiration (China)
Emend for Injection	Expired	2020(3)	2020	N/A
Januvia	2022(3)	2022(3)	2025-2026	2022
Janumet	2022(3)	2023	N/A	2022
Janumet XR	2022(3)	N/A	N/A	2022
Isentress	2024	2023(3)	2022-2026	2022
Simponi	N/A(4)	2024(5)	N/A(4)	N/A(4)
Lenvima(6)	2025(3) (with pending PTE)	2021 (patents), 2026(3) (SPCs)	2026	2021
Adempas(7)	2026(3)	2028(3)	2027-2028	2023
Bridion	2026(3) (with pending PTE)	2023	2024	2020
Nexplanon	2027 (device)	2025 (device)	Not Marketed	2025
Bravecto	2027 (with pending PTE)	2025 (patents), 2029 (SPCs)	2029	2033
Gardasil	2028	2021(3)	Expired	N/A
Gardasil 9	2028	2025 (patents), 2030(3) (SPCs)	N/A	2025
Keytruda	2028	2028 (patents), 2030(3) (SPCs)	2032-2033	2028
Lynparza(8)	2028(3) (with pending PTE)	2024 (patents), 2029(3) (SPCs)	2028-2029	2024
Zerbaxa	2028(3)	2023 (patents), 2028(3) (SPCs)	2028 (with pending PTE)	N/A
Belsomra	2029(3)	N/A	2031	N/A
Prevymis	2029(3) (with pending PTE)	2024 (patents), 2029(3) (SPCs)	2029	N/A
Steglatro(9)	2031(3) (with pending PTE)	2029 (patents), 2034(3) (SPCs)	N/A	2029
Steglujan(9)	2031 (with pending PTE)	2029 (patents), 2034 (SPCs)	N/A	2029
Segluromet(9)	2031 (with pending PTE)	2029 (patents), 2034 (SPCs)	N/A	2029
Delstrigo	2032 (with pending PTE)	2031 (patents), 2033 (SPCs)	N/A	N/A
Pifeltro	2032 (with pending PTE)	2031 (patents), 2033 (SPCs)	N/A	N/A
Recarbrio	2033(3) (with pending PTE)	N/A	N/A	N/A

Note: Compound patent unless otherwise noted. Certain of the products listed may be the subject of patent litigation. See Item 8. “Financial Statements and Supplementary Data,” Note 10. “Contingencies and Environmental Liabilities” below.

N/A: Currently no marketing approval.

⁽¹⁾  The EU date represents the expiration date for the following five countries: France, Germany, Italy, Spain and the United Kingdom (Major EU Markets). If SPC applications have been filed but have not been granted in all Major EU Markets, both the patent expiry date and the SPC expiry date are listed.

⁽²⁾  The PTE system in Japan allows for a patent to be extended more than once provided the later approval is directed to a different indication from that of the previous approval. This may result in multiple PTE approvals for a given patent, each with its own expiration date.

⁽³⁾  Eligible for 6 months Pediatric Exclusivity.

⁽⁴⁾  The Company has no marketing rights in the U.S., Japan or China.

⁽⁵⁾  Expiration of the distribution agreement with Janssen Pharmaceuticals, Inc.

⁽⁶⁾  Part of a global strategic oncology collaboration with Eisai.

⁽⁷⁾  Being commercialized in a worldwide collaboration with Bayer AG.

⁽⁸⁾  Part of a global strategic oncology collaboration with AstraZeneca.

⁽⁹⁾  Being commercialized and promoted in a worldwide, except Japan, collaboration with Pfizer Inc.

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The Company also has the following key U.S. patent protection for drug candidates in Phase 3 development: 

Phase 3 Drug Candidate	Currently Anticipated Year of Expiration (in the U.S.)
MK-7264 (gefapixant)	2027
MK-1242 (vericiguat)(1)	2031
V114 (pneumoconjugate vaccine)	2031
MK-8591A (islatravir/doravirine)	2032

⁽¹⁾  Being developed in a worldwide collaboration with Bayer AG.

Unless otherwise noted, the patents in the above charts are compound patents. Each patent may be subject to a future patent term restoration of up to five years and six month pediatric market exclusivity, either or both of which may be available. In addition, depending on the circumstances surrounding any final regulatory approval of the compound, there may be other listed patents or patent applications pending that could have relevance to the product as finally approved; the relevance of any such application would depend upon the claims that ultimately may be granted and the nature of the final regulatory approval of the product. Also, regulatory exclusivity tied to the protection of clinical data is complementary to patent protection and, in some cases, may provide more effective or longer lasting marketing exclusivity than a compound’s patent estate. In the United States, the data protection generally runs five years from first marketing approval of a new chemical entity, extended to seven years for an orphan drug indication and 12 years from first marketing approval of a biological product.

While the expiration of a product patent normally results in a loss of market exclusivity for the covered pharmaceutical product, commercial benefits may continue to be derived from: (i) later-granted patents on processes and intermediates related to the most economical method of manufacture of the active ingredient of such product; (ii) patents relating to the use of such product; (iii) patents relating to novel compositions and formulations; and (iv) in the United States and certain other countries, market exclusivity that may be available under relevant law. The effect of product patent expiration on pharmaceutical products also depends upon many other factors such as the nature of the market and the position of the product in it, the growth of the market, the complexities and economics of the process for manufacture of the active ingredient of the product and the requirements of new drug provisions of the Federal Food, Drug and Cosmetic Act or similar laws and regulations in other countries.

Additions to market exclusivity are sought in the United States and other countries through all relevant laws, including laws increasing patent life. Some of the benefits of increases in patent life have been partially offset by an increase in the number of incentives for and use of generic products. Additionally, improvements in intellectual property laws are sought in the United States and other countries through reform of patent and other relevant laws and implementation of international treaties.

For further information with respect to the Company’s patents, see Item 1A. “Risk Factors” and Item 8. “Financial Statements and Supplementary Data,” Note 10. “Contingencies and Environmental Liabilities” below.

Worldwide, all of the Company’s important products are sold under trademarks that are considered in the aggregate to be of material importance. Trademark protection continues in some countries as long as used; in other countries, as long as registered. Registration is for fixed terms and can be renewed indefinitely.

Royalty income in 2019 on patent and know-how licenses and other rights amounted to $135 million. Merck also incurred royalty expenses amounting to $1.7 billion in 2019 under patent and know-how licenses it holds.

Research and Development

The Company’s business is characterized by the introduction of new products or new uses for existing products through a strong research and development program. At December 31, 2019, approximately 15,600 people were employed in the Company’s research activities. The Company prioritizes its research and development efforts and focuses on candidates that it believes represent breakthrough science that will make a difference for patients and payers.

The Company maintains a number of long-term exploratory and fundamental research programs in biology and chemistry as well as research programs directed toward product development. The Company’s research and development model is designed to increase productivity and improve the probability of success by prioritizing the

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Company’s research and development resources on candidates the Company believes are capable of providing unambiguous, promotable advantages to patients and payers and delivering the maximum value of its approved medicines and vaccines through new indications and new formulations. Merck is pursuing emerging product opportunities independent of therapeutic area or modality (small molecule, biologics and vaccines) and is building its biologics capabilities. The Company is committed to ensuring that externally sourced programs remain an important component of its pipeline strategy, with a focus on supplementing its internal research with a licensing and external alliance strategy focused on the entire spectrum of collaborations from early research to late-stage compounds, as well as access to new technologies.

The Company’s clinical pipeline includes candidates in multiple disease areas, including cancer, cardiovascular diseases, diabetes and other metabolic diseases, infectious diseases, neurosciences, pain, respiratory diseases, and vaccines.

In the development of human health products, industry practice and government regulations in the United States and most foreign countries provide for the determination of effectiveness and safety of new chemical compounds through pre-clinical tests and controlled clinical evaluation. Before a new drug or vaccine may be marketed in the United States, recorded data on pre-clinical and clinical experience are included in the NDA for a drug or the Biologics License Application (BLA) for a vaccine or biologic submitted to the FDA for the required approval.

Once the Company’s scientists discover a new small molecule compound or biologic that they believe has promise to treat a medical condition, the Company commences pre-clinical testing with that compound. Pre-clinical testing includes laboratory testing and animal safety studies to gather data on chemistry, pharmacology, immunogenicity and toxicology. Pending acceptable pre-clinical data, the Company will initiate clinical testing in accordance with established regulatory requirements. The clinical testing begins with Phase 1 studies, which are designed to assess safety, tolerability, pharmacokinetics, and preliminary pharmacodynamic activity of the compound in humans. If favorable, additional, larger Phase 2 studies are initiated to determine the efficacy of the compound in the affected population, define appropriate dosing for the compound, as well as identify any adverse effects that could limit the compound’s usefulness. In some situations, the clinical program incorporates adaptive design methodology to use accumulating data to decide how to modify aspects of the ongoing clinical study as it continues, without undermining the validity and integrity of the trial. One type of adaptive clinical trial is an adaptive Phase 2a/2b trial design, a two-stage trial design consisting of a Phase 2a proof-of-concept stage and a Phase 2b dose-optimization finding stage. If data from the Phase 2 trials are satisfactory, the Company commences large-scale Phase 3 trials to confirm the compound’s efficacy and safety. Another type of adaptive clinical trial is an adaptive Phase 2/3 trial design, a study that includes an interim analysis and an adaptation that changes the trial from having features common in a Phase 2 study (e.g. multiple dose groups) to a design similar to a Phase 3 trial. An adaptive Phase 2/3 trial design reduces timelines by eliminating activities which would be required to start a separate study. Upon completion of Phase 3 trials, if satisfactory, the Company submits regulatory filings with the appropriate regulatory agencies around the world to have the product candidate approved for marketing. There can be no assurance that a compound that is the result of any particular program will obtain the regulatory approvals necessary for it to be marketed.

Vaccine development follows the same general pathway as for drugs. Pre-clinical testing focuses on the vaccine’s safety and ability to elicit a protective immune response (immunogenicity). Pre-marketing vaccine clinical trials are typically done in three phases. Initial Phase 1 clinical studies are conducted in normal subjects to evaluate the safety, tolerability and immunogenicity of the vaccine candidate. Phase 2 studies are dose-ranging studies. Finally, Phase 3 trials provide the necessary data on effectiveness and safety. If successful, the Company submits regulatory filings with the appropriate regulatory agencies.

In the United States, the FDA review process begins once a complete NDA or BLA is submitted, received and accepted for review by the agency. Within 60 days after receipt, the FDA determines if the application is sufficiently complete to permit a substantive review. The FDA also assesses, at that time, whether the application will be granted a priority review or standard review. Pursuant to the Prescription Drug User Fee Act V (PDUFA), the FDA review period target for NDAs or original BLAs is either six months, for priority review, or ten months, for a standard review, from the time the application is deemed sufficiently complete. Once the review timelines are determined, the FDA will generally act upon the application within those timelines, unless a major amendment has been submitted (either at the Company’s own initiative or the FDA’s request) to the pending application. If this occurs, the FDA may extend the review period to allow for review of the new information, but by no more than three months. Extensions to the review period are communicated to the Company. The FDA can act on an application either by issuing an approval letter or by issuing a Complete Response Letter (CRL) stating that the application will not be approved in its present form and describing all deficiencies that the FDA has identified. Should the Company wish to pursue an application after receiving a CRL, it can resubmit the application with information that addresses the questions or issues identified by the FDA in

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order to support approval. Resubmissions are subject to review period targets, which vary depending on the underlying submission type and the content of the resubmission.

The FDA has four program designations — Fast Track, Breakthrough Therapy, Accelerated Approval, and Priority Review — to facilitate and expedite development and review of new drugs to address unmet medical needs in the treatment of serious or life-threatening conditions. The Fast Track designation provides pharmaceutical manufacturers with opportunities for frequent interactions with FDA reviewers during the product’s development and the ability for the manufacturer to do a rolling submission of the NDA/BLA. A rolling submission allows completed portions of the application to be submitted and reviewed by the FDA on an ongoing basis. The Breakthrough Therapy designation provides manufacturers with all of the features of the Fast Track designation as well as intensive guidance on implementing an efficient development program for the product and a commitment by the FDA to involve senior managers and experienced staff in the review. The Accelerated Approval designation allows the FDA to approve a product based on an effect on a surrogate or intermediate endpoint that is reasonably likely to predict a product’s clinical benefit and generally requires the manufacturer to conduct required post-approval confirmatory trials to verify the clinical benefit. The Priority Review designation means that the FDA’s goal is to take action on the NDA/BLA within six months, compared to ten months under standard review.

In addition, under the Generating Antibiotic Incentives Now Act, the FDA may grant Qualified Infectious Disease Product (QIDP) status to antibacterial or antifungal drugs intended to treat serious or life threatening infections including those caused by antibiotic or antifungal resistant pathogens, novel or emerging infectious pathogens, or other qualifying pathogens. QIDP designation offers certain incentives for development of qualifying drugs, including Priority Review of the NDA when filed, eligibility for Fast Track designation, and a five-year extension of applicable exclusivity provisions under the Food, Drug and Cosmetic Act.

The primary method the Company uses to obtain marketing authorization of pharmaceutical products in the EU is through the “centralized procedure.” This procedure is compulsory for certain pharmaceutical products, in particular those using biotechnological processes, and is also available for certain new chemical compounds and products. A company seeking to market an innovative pharmaceutical product through the centralized procedure must file a complete set of safety data and efficacy data as part of a Marketing Authorization Application (MAA) with the European Medicines Agency (EMA). After the EMA evaluates the MAA, it provides a recommendation to the EC and the EC then approves or denies the MAA. It is also possible for new chemical products to obtain marketing authorization in the EU through a “mutual recognition procedure” in which an application is made to a single member state and, if the member state approves the pharmaceutical product under a national procedure, the applicant may submit that approval to the mutual recognition procedure of some or all other member states.

Outside of the United States and the EU, the Company submits marketing applications to national regulatory authorities. Examples of such are the Ministry of Health, Labour and Welfare in Japan, Health Canada, Agência Nacional de Vigilância Sanatária in Brazil, Korea Food and Drug Administration in South Korea, Therapeutic Goods Administration in Australia and the National Medical Products Administration in China. Each country has a separate and independent review process and timeline. In many markets, approval times can be longer as the regulatory authority requires approval in a major market, such as the United States or the EU, and issuance of a Certificate of Pharmaceutical Product from that market before initiating their local review process.

Research and Development Update

The Company currently has several candidates under regulatory review in the United States and internationally.

Keytruda is an anti-PD-1 therapy approved for the treatment of many cancers that is in clinical development for expanded indications. These approvals were the result of a broad clinical development program that currently consists of more than 1,000 clinical trials, including more than 600 trials that combine Keytruda with other cancer treatments. These studies encompass more than 30 cancer types including: biliary tract, cervical, colorectal, cutaneous squamous cell, endometrial, gastric, head and neck, hepatocellular, Hodgkin lymphoma, non-Hodgkin lymphoma, melanoma, mesothelioma, nasopharyngeal, non-small-cell lung, ovarian, PMBCL, prostate, renal, small-cell lung, triple-negative breast, and urothelial, many of which are currently in Phase 3 clinical development. Further trials are being planned for other cancers.

Keytruda is under review in the EU as monotherapy for the first-line treatment of patients with stage III NSCLC who are not candidates for surgical resection or definitive chemoradiation, or metastatic NSCLC, and whose tumors express PD-L1 (TPS ≥1%) with no EGFR or ALK genomic tumor aberrations based on results from the Phase 3 KEYNOTE-042 trial.

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Keytruda is under review in Japan as monotherapy and in combination with chemotherapy for the first-line treatment of advanced gastric or gastroesophageal junction adenocarcinoma based on results from the pivotal Phase 3 KEYNOTE-062 trial.

Keytruda is also under review in Japan as monotherapy for the second-line treatment of advanced or metastatic esophageal or esophagogastric junction carcinoma based on the results of the Phase 3 KEYNOTE-181 trial. Merck has made the decision to withdraw its Type II variation application for Keytruda for this indication in the EU.

In October 2019, the FDA accepted a supplemental BLA seeking use of Keytruda for the treatment of patients with recurrent and/or metastatic cutaneous squamous cell carcinoma (cSCC) that is not curable by surgery or radiation based on the results of the KEYNOTE-629 trial. The FDA set a PDUFA date of June 29, 2020.

In February 2020, Merck announced the FDA issued a Complete Response Letter (CRL) regarding Merck’s supplemental BLAs seeking to update the dosing frequency for Keytruda to include a 400 mg dose infused over 30 minutes every-six-weeks (Q6W) option in multiple indications. The submitted applications are based on pharmacokinetic modeling and simulation data presented at the 2018 American Society of Clinical Oncology (ASCO) Annual Meeting. These data supported the EC approval of 400 mg Q6W dosing for Keytruda monotherapy indications in March 2019. Merck is reviewing the letter and will discuss next steps with the FDA.

Additionally, Keytruda has received Breakthrough Therapy designation from the FDA in combination with neoadjuvant chemotherapy for the treatment of high-risk early-stage triple-negative breast cancer (TNBC) and in combination with enfortumab vedotin, in the first-line setting for the treatment of patients with unresectable locally advanced or metastatic urothelial cancer who are not eligible for cisplatin-containing chemotherapy. 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.

In September 2019, Merck announced results from the pivotal neoadjuvant/adjuvant Phase 3 KEYNOTE-522 trial in patients with early-stage TNBC. The trial investigated a regimen of neoadjuvant Keytruda plus chemotherapy, followed by adjuvant Keytruda as monotherapy (the Keytruda regimen) compared with a regimen of neoadjuvant chemotherapy followed by adjuvant placebo (the chemotherapy-placebo regimen). Interim findings were presented at the European Society for Medical Oncology (ESMO) 2019 Congress. In the neoadjuvant phase, Keytruda plus chemotherapy resulted in a statistically significant increase in pathological complete response (pCR) versus chemotherapy in patients with early-stage TNBC. The improvement seen when adding Keytruda to neoadjuvant chemotherapy was observed regardless of PD-L1 expression. In the other dual primary endpoint of event-free-survival (EFS), with a median follow-up of 15.5 months, the Keytruda regimen reduced the risk of progression in the neoadjuvant phase and recurrence in the adjuvant phase compared with the chemotherapy-placebo regimen. Merck continues to discuss interim analysis data from KEYNOTE-522 with regulatory authorities. The Keytruda breast cancer clinical development program encompasses several internal and external collaborative studies.

In February 2020, Merck announced that the pivotal Phase 3 KEYNOTE-355 trial investigating Keytruda in combination with chemotherapy met one of its dual primary endpoints of progression-free survival (PFS) in patients with metastatic triple-negative breast cancer (mTNBC) whose tumors expressed PD-L1 (CPS ≥10). Based on an interim analysis conducted by an independent Data Monitoring Committee (DMC), first-line treatment with Keytruda in combination with chemotherapy (nab-paclitaxel, paclitaxel or gemcitabine/carboplatin) demonstrated a statistically significant and clinically meaningful improvement in PFS compared to chemotherapy alone in these patients. Based on the recommendation of the DMC, the trial will continue without changes to evaluate the other dual primary endpoint of overall survival (OS).

In May 2019, Merck announced that the Phase 3 KEYNOTE-119 trial evaluating Keytruda as monotherapy for the second- or third-line treatment of patients with metastatic TNBC did not meet its pre-specified primary endpoint of superior OS compared to chemotherapy. Other endpoints were not formally tested per the study protocol because the primary endpoint of OS was not met.

In June 2019, Merck announced full results from the pivotal Phase 3 KEYNOTE-062 trial evaluating Keytruda as monotherapy and in combination with chemotherapy for the first-line treatment of advanced gastric or gastroesophageal junction adenocarcinoma. In the monotherapy arm of the study, Keytruda met a primary endpoint by demonstrating noninferiority to chemotherapy, the current standard of care, for OS in patients whose tumors expressed PD-L1 (CPS ≥1). In the combination arm of KEYNOTE-062, Keytruda plus chemotherapy was not found to be statistically superior for OS (CPS ≥1 or CPS ≥10) or PFS (CPS ≥1) compared with chemotherapy alone. Results were presented at the 2019 American Society of Clinical Oncology (ASCO) Annual Meeting. In September 2017, the FDA

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approved Keytruda as a third-line treatment for previously treated patients with recurrent locally advanced or metastatic gastric or gastroesophageal junction cancer whose tumors express PD-L1 (CPS ≥1) as determined by an FDA-approved test. KEYNOTE-062 was a potential confirmatory trial for this accelerated, third-line approval. In addition to KEYNOTE-062, additional first-line, Phase 3 studies in Merck’s gastric clinical program include KEYNOTE-811 and KEYNOTE-859, as well as KEYNOTE-585 in the neoadjuvant and adjuvant treatment setting.

In January 2020, Merck announced that the Phase 3 KEYNOTE-604 trial investigating Keytruda in combination with chemotherapy met one of its dual primary endpoints of PFS in the first-line treatment of patients with extensive stage SCLC. At the final analysis of the study, there was also an improvement in OS for patients treated with Keytruda in combination with chemotherapy compared to chemotherapy alone; however, these OS results did not meet statistical significance per the pre-specified statistical plan. Results will be presented at an upcoming medical meeting and discussed with regulatory authorities.

Lynparza, is an oral PARP inhibitor currently approved for certain types of advanced ovarian, breast and pancreatic cancers being co-developed for multiple cancer types as part of a collaboration with AstraZeneca.

Lynparza is under review in the EU as a first-line maintenance monotherapy for patients with gBRCAm metastatic pancreatic cancer whose disease has not progressed following first-line platinum-based chemotherapy. Lynparza was approved for this indication by the FDA in December 2019 based on results from the Phase 3 POLO trial. A decision from the EMA is expected in the second half of 2020.

In January 2020, the FDA accepted a supplemental NDA for Lynparza in combination with bevacizumab for the maintenance treatment of women with advanced ovarian cancer whose disease showed a complete or partial response to first-line treatment with platinum-based chemotherapy and bevacizumab based on the results from the pivotal Phase 3 PAOLA-1 trial. A PDUFA date is set for the second quarter of 2020. This indication is also under review in the EU.

In January 2020, the FDA accepted for Priority Review a supplemental NDA for Lynparza for the treatment of patients with metastatic castration-resistant prostate cancer (mCRPC) and deleterious or suspected deleterious germline or somatic homologous recombination repair (HRR) gene mutations, who have progressed following prior treatment with a new hormonal agent based on positive results from the Phase 3 PROfound trial. A PDUFA date is set for the second quarter of 2020. This indication is also under review in the EU.

In June 2019, Merck and AstraZeneca presented full results from the Phase 3 SOLO-3 trial which evaluated Lynparza, compared to chemotherapy, for the treatment of platinum-sensitive relapsed patients with gBRCAm advanced ovarian cancer, who have received two or more prior lines of chemotherapy. The results from the trial showed a statistically-significant and clinically-meaningful improvement in objective response rate (ORR) in the Lynparza arm compared to the chemotherapy arm. The key secondary endpoint of PFS was also significantly increased in the Lynparza arm compared to the chemotherapy arm. The results were presented at the 2019 ASCO Annual Meeting.

MK-5618, selumetinib, is a MEK 1/2 inhibitor being co-developed as part of a strategic collaboration with AstraZeneca. Selumetinib is under Priority Review with the FDA as a potential new medicine for pediatric patients aged three years and older with neurofibromatosis type 1 (NF1) and symptomatic, inoperable plexiform neurofibromas. This regulatory submission was based on positive results from the National Cancer Institute Cancer Therapy Evaluation Program-sponsored SPRINT Phase 2 Stratum 1 trial. A PDUFA date is set for the second quarter of 2020.

V503 is under review in Japan for an initial indication in females for the prevention of certain HPV-related diseases and precursors.

In February 2020, the FDA accepted for Priority Review a supplemental BLA for Gardasil 9 for the prevention of certain head and neck cancers caused by vaccine-type HPV in females and males 9 through 45 years of age. The FDA set a PDUFA date of June 2020.

In addition to the candidates under regulatory review, the Company has several drug candidates in Phase 3 clinical development in addition to the Keytruda programs discussed above.

Lynparza, in addition to the indications under review discussed above, is in Phase 3 development in combination with Keytruda for the treatment of NSCLC.

Lenvima is an orally available tyrosine kinase inhibitor currently approved for certain types of thyroid cancer, HCC, and in combination for certain patients with RCC being co-developed as part of a strategic collaboration with Eisai. Pursuant to the agreement, the companies will jointly initiate clinical studies evaluating the Keytruda/Lenvima combination in six types of cancer (endometrial cancer, NSCLC, HCC, HNSCC, bladder cancer and melanoma), as well as a basket trial targeting multiple cancer types. The FDA granted Breakthrough Therapy designation

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for Keytruda in combination with Lenvima both for the potential treatment of patients with advanced and/or metastatic RCC and for the potential treatment of patients with unresectable HCC not amenable to locoregional treatment.

MK-7264, gefapixant, is a selective, non-narcotic, orally-administered P2X3-receptor antagonist being investigated in Phase 3 trials for the treatment of refractory, chronic cough and in a Phase 2 trial for the treatment of women with endometriosis-related pain.

MK-1242, vericiguat, is a sGC stimulator for the potential treatment of patients with worsening chronic heart failure being developed as part of a worldwide strategic collaboration between Merck and Bayer. Vericiguat is being studied in patients suffering from chronic heart failure with reduced ejection fraction (Phase 3 clinical trial) and from chronic heart failure with preserved ejection fraction (Phase 2 clinical trial). In November 2019, Merck announced that the Phase 3 VICTORIA study evaluating the efficacy and safety of vericiguat met the primary efficacy endpoint. Vericiguat reduced the risk of the composite endpoint of heart failure hospitalization or cardiovascular death in patients with worsening chronic heart failure with reduced ejection fraction compared to placebo when given in combination with available heart failure therapies. The results of the VICTORIA study will be presented at an upcoming medical meeting in 2020.

V114 is an investigational polyvalent conjugate vaccine for the prevention of pneumococcal disease. In June 2018, Merck initiated the first Phase 3 study in the adult population for the prevention of invasive pneumococcal disease. Currently six Phase 3 adult studies are ongoing, including studies in healthy adults 50 years of age or older, adults with risk factors for pneumococcal disease, those infected with HIV, and those who are recipients of allogeneic hematopoietic stem cell transplant. In October 2018, Merck began the first Phase 3 study in the pediatric population. Currently, eight studies are ongoing, including studies in healthy infants and in children afflicted with sickle cell disease. V114 has received Breakthrough Therapy designation from the FDA for the prevention of invasive pneumococcal disease caused by the vaccine serotypes in pediatric patients (6 weeks to 18 years of age) and in adults.

The chart below reflects the Company’s research pipeline as of February 21, 2020. 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 cancer) and additional claims, line extensions or formulations for in-line products are not shown.

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Phase 2	Phase 3 (Phase 3 Entry Date)	Under Review
Cancer	Cancer	New Molecular Entities/Vaccines
MK-3475 Keytruda	MK-3475 Keytruda	Pediatric Neurofibromatosis Type-1
Advanced Solid Tumors	Biliary Tract (September 2019)	MK-5618 (selumetinib)(1) (U.S.)
MK-6482	Breast (October 2015)	HPV Vaccine
Renal Cell Carcinoma	Cervical (October 2018) (EU)	V503 Human Papillomavirus 9-valent Vaccine,
MK-7123(2)	Colorectal (November 2015)	Recombinant (JPN)
Solid Tumors	Cutaneous Squamous Cell Carcinoma	Certain Supplemental Filings
MK-7339 Lynparza(1)	(August 2019) (EU)	Cancer
Advanced Solid Tumors	Endometrial (August 2019) (EU)	MK-3475 Keytruda
MK-7690 (vicriviroc)(2)	Esophageal (December 2015) (EU)	●    First-Line Metastatic Non-Small-Cell Lung
Colorectal	Gastric (May 2015) (EU)	Cancer (KEYNOTE-042) (EU)
MK-7902 Lenvima(1)	Hepatocellular (May 2016) (EU)	●    First-Line Metastatic Gastric Cancer
Biliary Tract	Mesothelioma (May 2018)	(KEYNOTE-062) (JPN)
V937	Nasopharyngeal (April 2016)	●    Recurrent Locally Advanced or Metastatic
Melanoma	Ovarian (December 2018)	Esophageal Cancer (KEYNOTE-180/181)
MK-7684(2)	Prostate (May 2019)	(JPN)
Non-Small-Cell Lung	Small-Cell Lung (May 2017) (EU)	●    Recurrent and/or Metastatic Cutaneous
MK-1026	MK-7339 Lynparza(1,2)	Squamous Cell Carcinoma
Hematological Malignancies	Non-Small-Cell Lung (June 2019)	(KEYNOTE-629) (U.S.)
MK-4280(2)	MK-7902 Lenvima(1,2)	●    Alternative Dosing Regimen(3)
Hematological Malignancies	Bladder (May 2019)	(Q6W) (U.S.)
Non-Small-Cell Lung	Endometrial (June 2018) (EU)	MK-7339 Lynparza(1)
MK-1308(2)	Head and Neck Squamous Cell Carcinoma	●    First-Line gBRCAm Pancreatic Cancer
Non-Small-Cell Lung	(February 2020)	(POLO) (EU)
MK-5890(2)	Melanoma (March 2019)	●    First-Line Maintenance Newly Diagnosed
Non-Small-Cell Lung	Non-Small-Cell Lung (March 2019)	Advanced Ovarian Cancer (PAOLA)
Cytomegalovirus	Cough	(U.S.) (EU)
V160	MK-7264 (gefapixant) (March 2018)	●    Metastatic Prostate Cancer (PROfound)
HIV-1 Infection	Heart Failure	(U.S.) (EU)
MK-8591 (islatravir)	MK-1242 (vericiguat) (September 2016)(1)	Footnotes:
Overgrowth Syndrome	HIV-1 Infection	(1)     Being developed in a collaboration.
MK-7075	MK-8591A (islatravir/doravirine) (February 2020)	(2)     Being developed in combination with
Pediatric Neurofibromatosis Type-1	Pneumoconjugate Vaccine	Keytruda.
MK-5618 (selumetinib)(1) (EU)	V114 (June 2018)	(3) The Company received a CRL in February
Respiratory Syncytial Virus		2020.  Merck is reviewing the letter and will
MK-1654		discuss next steps with the FDA.
Schizophrenia
MK-8189

Employees

As of December 31, 2019, the Company had approximately 71,000 employees worldwide, with approximately 26,000 employed in the United States, including Puerto Rico. Approximately 30% of worldwide employees of the Company are represented by various collective bargaining groups.

Restructuring Activities

In early 2019, Merck approved a new global restructuring program (Restructuring Program) as part of a worldwide initiative focused on further optimizing the Company’s manufacturing and supply network, as well as reducing its global real estate footprint. This program is a continuation of the Company’s plant rationalization, builds on prior restructuring programs and does not include any actions associated with the planned spin-off of NewCo. As the Company continues to evaluate its global footprint and overall operating model, it has subsequently identified additional actions under the Restructuring Program, and could identify further actions over time. The actions currently contemplated under the Restructuring Program are expected to be substantially completed by the end of 2023. Actions under previous global restructuring programs have been substantially completed.

Environmental Matters

The Company believes that there are no compliance issues associated with applicable environmental laws and regulations that would have a material adverse effect on the Company. The Company is also remediating environmental contamination resulting from past industrial activity at certain of its sites. Expenditures for remediation and environmental liabilities were $19 million in 2019 and are estimated at $47 million in the aggregate for the years 2020 through 2024. These amounts do not consider potential recoveries from other parties. The Company has taken an active role in identifying and accruing for these costs and, in management’s opinion, the liabilities for all environmental matters that are probable and reasonably estimable have been accrued and totaled $67 million and $71 million at December 31, 2019 and 2018, respectively. Although it is not possible to predict with certainty the outcome

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of these matters, or the ultimate costs of remediation, management does not believe that any reasonably possible expenditures that may be incurred in excess of the liabilities accrued should exceed $58 million in the aggregate. Management also does not believe that these expenditures should have a material adverse effect on the Company’s financial condition, results of operations, liquidity or capital resources for any year.

Merck believes that climate change could present risks to its business. Some of the potential impacts of climate change to its business include increased operating costs due to additional regulatory requirements, physical risks to the Company’s facilities, water limitations and disruptions to its supply chain. These potential risks are integrated into the Company’s business planning including investment in reducing energy, water use and greenhouse gas emissions. The Company does not believe these risks are material to its business at this time.

Geographic Area Information

The Company’s operations outside the United States are conducted primarily through subsidiaries. Sales worldwide by subsidiaries outside the United States as a percentage of total Company sales were 57% of sales in each of 2019, 2018 and 2017.

The Company’s worldwide business is subject to risks of currency fluctuations, governmental actions and other governmental proceedings abroad. The Company does not regard these risks as a deterrent to further expansion of its operations abroad. However, the Company closely reviews its methods of operations and adopts strategies responsive to changing economic and political conditions.

Merck has operations in countries located in Latin America, the Middle East, Africa, Eastern Europe and Asia Pacific. Business in these developing areas, while sometimes less stable, offers important opportunities for growth over time.

Available Information

The Company’s Internet website address is www.merck.com. The Company will make available, free of charge at the “Investors” portion of its website, its Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and all amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after such reports are electronically filed with, or furnished to, the U.S. Securities and Exchange Commission (SEC). The address of that website is www.sec.gov. In addition, the Company will provide without charge a copy of its Annual Report on Form 10-K, including financial statements and schedules, upon the written request of any shareholder to the Office of the Secretary, Merck & Co., Inc., 2000 Galloping Hill Road, K1-4157, Kenilworth, NJ 07033 U.S.A.

The Company’s corporate governance guidelines and the charters of the Board of Directors’ four standing committees are available on the Company’s website at www.merck.com/about/leadership and all such information is available in print to any shareholder who requests it from the Company.

Item 1A. Risk Factors.

Investors should carefully consider all of the information set forth in this Form 10-K, including the following risk factors, before deciding to invest in any of the Company’s securities. The risks below are not the only ones the Company faces. Additional risks not currently known to the Company or that the Company presently deems immaterial may also impair its business operations. The Company’s business, financial condition, results of operations or prospects could be materially adversely affected by any of these risks. This Form 10-K also contains forward-looking statements that involve risks and uncertainties. The Company’s results could materially differ from those anticipated in these forward-looking statements as a result of certain factors, including the risks it faces described below and elsewhere. See “Cautionary Factors that May Affect Future Results” below.

The Company is dependent on its patent rights, and if its patent rights are invalidated or circumvented, its business could be materially adversely affected.

Patent protection is considered, in the aggregate, to be of material importance to the Company’s marketing of human health and animal health products in the United States and in most major foreign markets. Patents covering products that it has introduced normally provide market exclusivity, which is important for the successful marketing

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and sale of its products. The Company seeks patents covering each of its products in each of the markets where it intends to sell the products and where meaningful patent protection is available.

Even if the Company succeeds in obtaining patents covering its products, third parties or government authorities may challenge or seek to invalidate or circumvent its patents and patent applications. It is important for the Company’s business to defend successfully the patent rights that provide market exclusivity for its products. The Company is often involved in patent disputes relating to challenges to its patents or claims by third parties of infringement against the Company. The Company defends its patents both within and outside the United States, including by filing claims of infringement against other parties. See Item 8. “Financial Statements and Supplementary Data,” Note 10. “Contingencies and Environmental Liabilities” below. In particular, manufacturers of generic pharmaceutical products from time to time file abbreviated NDAs with the FDA seeking to market generic forms of the Company’s products prior to the expiration of relevant patents owned or licensed by the Company. The Company normally responds by defending its patent, including by filing lawsuits alleging patent infringement. Patent litigation and other challenges to the Company’s patents are costly and unpredictable and may deprive the Company of market exclusivity for a patented product or, in some cases, third-party patents may prevent the Company from marketing and selling a product in a particular geographic area.

Additionally, certain foreign governments have indicated that compulsory licenses to patents may be granted in the case of national emergencies or in other circumstances, which could diminish or eliminate sales and profits from those regions and negatively affect the Company’s results of operations. Further, court decisions relating to other companies’ patents, potential legislation in both the U.S. and certain foreign markets relating to patents, as well as regulatory initiatives may result in a more general weakening of intellectual property protection.

If one or more important products lose patent protection in profitable markets, sales of those products are likely to decline significantly as a result of generic versions of those products becoming available. The Company’s results of operations may be adversely affected by the lost sales unless and until the Company has launched commercially successful products that replace the lost sales. In addition, if products that were measured at fair value and capitalized in connection with acquisitions experience difficulties in the market that negatively affect product cash flows, the Company may recognize material non-cash impairment charges with respect to the value of those products.

A chart listing the patent protection for certain of the Company’s marketed products, and U.S. patent protection for candidates in Phase 3 clinical development is set forth above in Item 1. “Business — Patents, Trademarks and Licenses.”

As the Company’s products lose market exclusivity, the Company generally experiences a significant and rapid loss of sales from those products.

The Company depends upon patents to provide it with exclusive marketing rights for its products for some period of time. Loss of patent protection for one of the Company’s products typically leads to a significant and rapid loss of sales for that product as lower priced generic versions of that drug become available. In the case of products that contribute significantly to the Company’s sales, the loss of market exclusivity can have a material adverse effect on the Company’s business, cash flow, results of operations, financial condition and prospects. For example, the patents that provided U.S. and EU market exclusivity for certain forms of Noxafil expired in July 2019 and December 2019, respectively, and the Company anticipates a significant decline in U.S. and EU Noxafil sales. Also, the patent that provided U.S. market exclusivity for NuvaRing expired in April 2018 and generic competition began in December 2019. The Company anticipates a rapid and substantial decline in U.S. NuvaRing sales in 2020 as a result of this generic competition. In addition, the patents that provide market exclusivity for Januvia and Janumet in the U.S. expire in July 2022 (although six-month pediatric exclusivity may extend this date). The patent that provides market exclusivity for Januvia in the EU expires in July 2022 (although pediatric exclusivity may extend this date to September 2022). Finally, the SPC that provides market exclusivity for Janumet in the EU expires in April 2023. The Company anticipates sales of Januvia and Janumet in these markets will decline substantially after these patent expiries.

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Key products generate a significant amount of the Company’s profits and cash flows, and any events that adversely affect the markets for its leading products could have a material adverse effect on the Company’s results of operations and financial condition.

The Company’s ability to generate profits and operating cash flow depends largely upon the continued profitability of the Company’s key products, such as Keytruda, Gardasil/Gardasil 9, Januvia, Janumet, and Bridion. In particular, in 2019, the Company’s oncology portfolio, led by Keytruda, represented the majority of the Company’s revenue and earnings growth. As a result of the Company’s dependence on key products, any event that adversely affects any of these products or the markets for any of these products could have a significant adverse impact on results of operations and cash flows. These events could include loss of patent protection, increased costs associated with manufacturing, generic or over-the-counter availability of the Company’s product or a competitive product, the discovery of previously unknown side effects, results of post-approval trials, increased competition from the introduction of new, more effective treatments and discontinuation or removal from the market of the product for any reason. Such events could have a material adverse effect on the sales of any such products.

The Company’s research and development efforts may not succeed in developing commercially successful products and the Company may not be able to acquire commercially successful products in other ways; in consequence, the Company may not be able to replace sales of successful products that have lost patent protection.

Like other major pharmaceutical companies, in order to remain competitive, the Company must continue to launch new products. Expected declines in sales of products after the loss of market exclusivity mean that the Company’s future success is dependent on its pipeline of new products, including new products that it may develop through collaborations and joint ventures and products that it is able to obtain through license or acquisition. To accomplish this, the Company commits substantial effort, funds and other resources to research and development, both through its own dedicated resources and through various collaborations with third parties. There is a high rate of failure inherent in the research and development process for new drugs. As a result, there is a high risk that funds invested by the Company in research programs will not generate financial returns. This risk profile is compounded by the fact that this research has a long investment cycle. To bring a pharmaceutical compound from the discovery phase to market may take a decade or more and failure can occur at any point in the process, including later in the process after significant funds have been invested.

For a description of the research and development process, see Item 1. “Business — Research and Development” above. Each phase of testing is highly regulated and during each phase there is a substantial risk that the Company will encounter serious obstacles or will not achieve its goals. Therefore, the Company may abandon a product in which it has invested substantial amounts of time and resources. Some of the risks encountered in the research and development process include the following: pre-clinical testing of a new compound may yield disappointing results; competing products from other manufacturers may reach the market first; clinical trials of a new drug may not be successful; a new drug may not be effective or may have harmful side effects; a new drug may not be approved by the regulators for its intended use; it may not be possible to obtain a patent for a new drug; payers may refuse to cover or reimburse the new product; or sales of a new product may be disappointing.

The Company cannot state with certainty when or whether any of its products now under development will be approved or launched; whether it will be able to develop, license or otherwise acquire compounds, product candidates or products; or whether any products, once launched, will be commercially successful. The Company must maintain a continuous flow of successful new products and successful new indications or brand extensions for existing products sufficient both to cover its substantial research and development costs and to replace sales that are lost as profitable products lose market exclusivity or are displaced by competing products or therapies. Failure to do so in the short term or long term would have a material adverse effect on the Company’s business, results of operations, cash flow, financial condition and prospects.

The Company’s success is dependent on the successful development and marketing of new products, which are subject to substantial risks.

Products that appear promising in development may fail to reach the market or fail to succeed for numerous reasons, including the following:

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• findings of ineffectiveness, superior safety or efficacy of competing products, or harmful side effects in clinical or pre-clinical testing;

• failure to receive the necessary regulatory approvals, including delays in the approval of new products and new indications, or the anticipated labeling, and uncertainties about the time required to obtain regulatory approvals and the benefit/risk standards applied by regulatory agencies in determining whether to grant approvals;

• failure in certain markets to obtain reimbursement commensurate with the level of innovation and clinical benefit presented by the product;

• lack of economic feasibility due to manufacturing costs or other factors; and

• preclusion from commercialization by the proprietary rights of others.

In the future, if certain pipeline programs are cancelled or if the Company believes that their commercial prospects have been reduced, the Company may recognize material non-cash impairment charges for those programs that were measured at fair value and capitalized in connection with acquisitions or certain collaborations.

Failure to successfully develop and market new products in the short term or long term would have a material adverse effect on the Company’s business, results of operations, cash flow, financial condition and prospects.

The Company’s products, including products in development, cannot be marketed unless the Company obtains and maintains regulatory approval.

The Company’s activities, including research, pre-clinical testing, clinical trials and the manufacturing and marketing of its products, are subject to extensive regulation by numerous federal, state and local governmental authorities in the United States, including the FDA, and by foreign regulatory authorities, including in the EU, Japan and China. In the United States, the FDA administers requirements covering the testing, approval, safety, effectiveness, manufacturing, labeling and marketing of prescription pharmaceuticals. In many cases, the FDA requirements have increased the amount of time and money necessary to develop new products and bring them to market in the United States. Regulation outside the United States also is primarily focused on drug safety and effectiveness and, in many cases, reduction in the cost of drugs. The FDA and foreign regulatory authorities, including in Japan and China, have substantial discretion to require additional testing, to delay or withhold registration and marketing approval and to otherwise preclude distribution and sale of a product.

Even if the Company is successful in developing new products, it will not be able to market any of those products unless and until it has obtained all required regulatory approvals in each jurisdiction where it proposes to market the new products. Once obtained, the Company must maintain approval as long as it plans to market its new products in each jurisdiction where approval is required. The Company’s failure to obtain approval, significant delays in the approval process, or its failure to maintain approval in any jurisdiction will prevent it from selling the products in that jurisdiction. The Company would not be able to realize revenues for those new products in any jurisdiction where it does not have approval.

Developments following regulatory approval may adversely affect sales of the Company’s products.

Even after a product reaches the market, certain developments following regulatory approval may decrease demand for the Company’s products, including the following:

• results in post-approval Phase 4 trials or other studies;

• the re-review of products that are already marketed;

• the recall or loss of marketing approval of products that are already marketed;

• changing government standards or public expectations regarding safety, efficacy, quality or labeling changes; and

• scrutiny of advertising and promotion.

In the past several years, clinical trials and post-marketing surveillance of certain marketed drugs of the Company and of competitors within the industry have raised concerns that have led to recalls, withdrawals or adverse

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labeling of marketed products. Clinical trials and post-marketing surveillance of certain marketed drugs also have raised concerns among some prescribers and patients relating to the safety or efficacy of pharmaceutical products in general that have negatively affected the sales of such products. In addition, increased scrutiny of the outcomes of clinical trials has led to increased volatility in market reaction. Further, these matters often attract litigation and, even where the basis for the litigation is groundless, considerable resources may be needed to respond.

In addition, following in the wake of product withdrawals and other significant safety issues, health authorities such as the FDA, the EMA, Japan’s PMDA and China’s NMPA have increased their focus on safety when assessing the benefit/risk balance of drugs. Some health authorities appear to have become more cautious when making decisions about approvability of new products or indications.

If previously unknown side effects are discovered or if there is an increase in negative publicity regarding known side effects of any of the Company’s products, it could significantly reduce demand for the product or require the Company to take actions that could negatively affect sales, including removing the product from the market, restricting its distribution or applying for labeling changes. Further, in the current environment in which all pharmaceutical companies operate, the Company is at risk for product liability and consumer protection claims and civil and criminal governmental actions related to its products, research and/or marketing activities. In addition, dissemination of promotional materials through evolving digital channels serves to increase visibility and scrutiny in the marketplace.

The Company faces intense competition from lower cost generic products.

In general, the Company faces increasing competition from lower-cost generic products. The patent rights that protect its products are of varying strengths and durations. In addition, in some countries, patent protection is significantly weaker than in the United States or in the EU. In the United States and the EU, political pressure to reduce spending on prescription drugs has led to legislation and other measures that encourage the use of generic and biosimilar products. Although it is the Company’s policy to actively protect its patent rights, generic challenges to the Company’s products can arise at any time, and the Company’s patents may not prevent the emergence of generic competition for its products.

Loss of patent protection for a product typically is followed promptly by generic substitutes, reducing the Company’s sales of that product. Availability of generic substitutes for the Company’s drugs may adversely affect its results of operations and cash flow. In addition, proposals emerge from time to time in the United States and other countries for legislation to further encourage the early and rapid approval of generic drugs. Any such proposal that is enacted into law could worsen this substantial negative effect on the Company’s sales and, potentially, its business, cash flow, results of operations, financial condition and prospects.

The Company faces intense competition from competitors’ products.

The Company’s products face intense competition from competitors’ products. This competition may increase as new products enter the market. In such an event, the competitors’ products may be safer or more effective, more convenient to use, have better insurance coverage or reimbursement levels or be more effectively marketed and sold than the Company’s products. Alternatively, in the case of generic competition, including the generic availability of competitors’ branded products, they may be equally safe and effective products that are sold at a substantially lower price than the Company’s products. As a result, if the Company fails to maintain its competitive position, this could have a material adverse effect on its business, cash flow, results of operations, financial condition and prospects. In addition, if products that were measured at fair value and capitalized in connection with acquisitions experience difficulties in the market that negatively impact product cash flows, the Company may recognize material non-cash impairment charges with respect to the value of those products.

The Company faces continued pricing pressure with respect to its products.

The Company faces continued pricing pressure globally and, particularly in mature markets, from managed care organizations, government agencies and programs that could negatively affect the Company’s sales and profit margins. In the United States, these include (i) practices of managed care groups and institutional and governmental purchasers, (ii) U.S. federal laws and regulations related to Medicare and Medicaid, including the Medicare Prescription Drug Improvement and Modernization Act of 2003 and the ACA, and (iii) state activities aimed at increasing price transparency, including new laws as noted above in Item 1. “Competition and the Health Care Environment — Health

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Care Environment and Government Regulations.” Changes to the health care system enacted as part of health care reform in the United States, as well as increased purchasing power of entities that negotiate on behalf of Medicare, Medicaid, and private sector beneficiaries, could result in further pricing pressures. In addition, in the United States, larger customers have received higher rebates on drugs in certain highly competitive categories. The Company must also compete to be placed on formularies of managed care organizations. Exclusion of a product from a formulary can lead to reduced usage in the managed care organization.

In order to provide information about the Company’s pricing practices, the Company annually posts on its website its Pricing Transparency Report for the United States. The report provides the Company’s average annual list price and net price increases across the Company’s U.S. portfolio dating back to 2010. In 2019, the Company’s gross U.S. sales were reduced by approximately 44% as a result of rebates, discounts and returns.

Outside the United States, numerous major markets, including the EU, Japan and China have pervasive government involvement in funding health care and, in that regard, fix the pricing and reimbursement of pharmaceutical and vaccine products. Consequently, in those markets, the Company is subject to government decision making and budgetary actions with respect to its products. In Japan, the pharmaceutical industry is subject to government-mandated biennial price reductions of pharmaceutical products and certain vaccines, which will occur again in 2020. Furthermore, the government can order re-pricing for specific products if it determines that use of such product will exceed certain thresholds defined under applicable re-pricing rules. For example, pursuant to a re-pricing rule, the Japanese government reduced the price of Keytruda by 17.5%, effective February 2020. Additionally, Keytruda will be subject to another significant price reduction in April 2020 under a provision of the Japanese pricing rules.

The Company expects pricing pressures to continue in the future.

The health care industry in the United States has been, and will continue to be, subject to increasing regulation and political action.

The Company believes that the health care industry will continue to be subject to increasing regulation as well as political and legal action, as future proposals to reform the health care system are considered by the Executive branch, Congress and state legislatures.

In 2010, the United States enacted major health care reform legislation in the form of the ACA. Various insurance market reforms have advanced and state and federal insurance exchanges were launched in 2014. The ACA increased the mandated Medicaid rebate from 15.1% to 23.1%, expanded the rebate to Medicaid managed care utilization, and increased the types of entities eligible for the federal 340B drug discount program.

The ACA also requires pharmaceutical manufacturers to pay a point of service discount to Medicare Part D beneficiaries when they are in the Medicare Part D coverage gap (i.e., the so-called “donut hole”) which increased to 70% in 2019 and was extended to biosimilar products. In 2019, the Company’s revenue was reduced by approximately $615 million due to this requirement. Also, pharmaceutical manufacturers are required to pay an annual non-tax deductible health care reform fee. In 2019, the Company recorded $112 million of costs for this annual fee.

In 2016, the Centers for Medicare & Medicaid Services (CMS) issued the Medicaid rebate final rule that implements provisions of the ACA effective April 1, 2016. The rule provides comprehensive guidance on the calculation of Average Manufacturer Price and Best Price; two metrics utilized to determine the rebates drug manufacturers are required to pay to state Medicaid programs. The impact of changes resulting from the issuance of the rule is not material to Merck at this time. However, the Company is still awaiting guidance from CMS on two aspects of the rule that were deferred for later implementation. These include a definition of what constitutes a product ‘line extension’ and a delay in the participation of the U.S. Territories in the Medicaid Drug Rebate Program until April 1, 2022. The Company will evaluate the financial impact of these two elements when they become effective.

In addition, as discussed above in “Competition and the Health Care Environment,” the administration has recently proposed a draft rule that would allow importation of certain lower-cost prescription drugs from Canada. If the rule is finalized as proposed, states or certain other non-federal governmental entities would be able to submit importation program proposals to the FDA for review and authorization of two-year programs (with the opportunity to extend for two more years). There will be a public comment period on the proposed rule which will expire on March 9, 2020. Following the comment period, the FDA will have to review and finalize its proposal before any states or other

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parties can submit their plans to comply with the federal rule. If the proposed rule is adopted, it likely will be some time before states or other parties can actually implement importation plans.

Also, in October 2018, the administration issued an advance notice of proposed rulemaking to implement an “International Pricing Index” (IPI) model in the United States for products covered under Medicare Part B. The proposal would: (1) reduce Medicare Part B payments for drugs based on a market basket of international prices; (2) allow private sector vendors to negotiate prices for drugs, take title to drugs, and compete for physician and hospital business; and (3) change the physician reimbursement under Medicare Part B from the current model to eliminate the buy and bill system and instead pay physicians based on a flat fee that approximates the revenue they currently receive from drugs. Public comments on the IPI proposal were accepted through late 2018 and it is unclear when the agency may issue a proposed rule on the IPI model. Adoption of one or both of the proposed rules could have a material adverse effect on the Company’s business, results of operations and financial condition.

The Company cannot predict the likelihood of additional future changes in the health care industry in general, or the pharmaceutical industry in particular, or what impact they may have on the Company’s business, cash flow, results of operations, financial condition and prospects.

The Company is increasingly dependent on sophisticated software applications and computing infrastructure. In 2017, the Company experienced a network cyber-attack that led to a disruption of its worldwide operations, including manufacturing, research and sales operations. The Company could be a target of future cyber-attacks.

The Company is increasingly dependent on sophisticated software applications and complex information technology systems and computing infrastructure (collectively, IT systems) to conduct critical operations. Certain of these systems are managed, hosted, provided or used by third parties to assist in conducting the Company’s business. Disruption, degradation, or manipulation of these IT systems through intentional or accidental means by the Company’s employees, third parties with authorized access or unauthorized third parties could adversely affect key business processes. Cyber-attacks against the Company’s IT systems or third-party providers’ IT systems, such as cloud-based systems, could result in exposure of confidential information, the modification of critical data, and/or the failure of critical operations. Misuse of any of these IT systems could result in the disclosure of sensitive personal information or the theft of trade secrets, intellectual property, or other confidential business information. The Company continues to leverage new and innovative technologies across the enterprise to improve the efficacy and efficiency of its business processes; the use of which can create new risks.

In 2017, the Company experienced a network cyber-attack that led to a disruption of its worldwide operations, including manufacturing, research and sales operations, and resulting losses.

The Company has insurance coverage insuring against losses resulting from cyber-attacks and has received proceeds in connection with the 2017 cyber-attack. However, there are disputes with certain of the insurers about the availability of some of the insurance coverage for claims related to the 2017 cyber-attack.

The Company has implemented a variety of measures to further enhance and modernize its systems to guard against similar attacks in the future, and also is pursuing an enterprise-wide effort to enhance the Company's resiliency against future cyber-attacks, including incidents similar to the 2017 attack. The objective of these efforts is not only to protect against future cyber-attacks, but also to improve the speed of the Company’s recovery from such attacks and enable continued business operations to the greatest extent possible during any recovery period.

Although the aggregate impact of cyber-attacks and network disruptions, including the 2017 cyber-attack, on the Company’s operations and financial condition has not been material to date, the Company continues to be a target of events of this nature and expects them to continue. The Company monitors its data, information technology and personnel usage of Company IT systems to reduce these risks and continues to do so on an ongoing basis for any current or potential threats. There can be no assurance that the Company’s efforts to protect its data and IT systems or the efforts of third-party providers to protect their IT systems will be successful in preventing disruptions to the Company’s operations, including its manufacturing, research and sales operations. Such disruptions have in the past and could in the future result in loss of revenue, or the loss of critical or sensitive information from the Company’s or the Company’s third-party providers’ databases or IT systems and have in the past and could in the future also result in financial, legal, business or reputational harm to the Company and substantial remediation costs.

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The Company is subject to a variety of U.S. and international laws and regulations.

The Company is currently subject to a number of government laws and regulations and, in the future, could become subject to new government laws and regulations. The costs of compliance with such laws and regulations, or the negative results of non-compliance, could adversely affect the business, cash flow, results of operations, financial condition and prospects of the Company; these laws and regulations include (i) additional healthcare reform initiatives in the United States or in other countries, including additional mandatory discounts or fees; (ii) the U.S. Foreign Corrupt Practices Act or other anti-bribery and corruption laws; (iii) new laws, regulations and judicial or other governmental decisions affecting pricing, drug reimbursement, and access or marketing within or across jurisdictions; (iv) changes in intellectual property laws; (v) changes in accounting standards; (vi) new and increasing data privacy regulations and enforcement, particularly in the EU and the United States; (vii) legislative mandates or preferences for local manufacturing of pharmaceutical or vaccine products; (viii) emerging and new global regulatory requirements for reporting payments and other value transfers to healthcare professionals; (ix) environmental regulations; and (x) the potential impact of importation restrictions, embargoes, trade sanctions and legislative and/or other regulatory changes.

The uncertainty in global economic conditions together with cost-reduction measures being taken by certain governments could negatively affect the Company’s operating results.

Uncertainty in global economic and geopolitical conditions may result in a slowdown to the global economy that could affect the Company’s business by reducing the prices that drug wholesalers and retailers, hospitals, government agencies and managed health care providers may be able or willing to pay for the Company’s products or by reducing the demand for the Company’s products, which could in turn negatively impact the Company’s sales and result in a material adverse effect on the Company’s business, cash flow, results of operations, financial condition and prospects.

Global efforts toward health care cost containment continue to exert pressure on product pricing and market access worldwide. Changes to the U.S. health care system as part of health care reform, as well as increased purchasing power of entities that negotiate on behalf of Medicare, Medicaid, and private sector beneficiaries, have contributed to pricing pressure. In several international markets, government-mandated pricing actions have reduced prices of generic and patented drugs. In addition, the Company’s revenue performance in 2019 was negatively affected by other cost-reduction measures taken by governments and other third-parties to lower health care costs. The Company anticipates all of these actions, and additional actions in the future, will continue to negatively affect revenue performance.

If credit and economic conditions worsen, the resulting economic and currency impacts in the affected markets and globally could have a material adverse effect on the Company’s results.

The Company has significant global operations, which expose it to additional risks, and any adverse event could have a material adverse effect on the Company’s results of operations and financial condition.

The extent of the Company’s operations outside the United States is significant. Risks inherent in conducting a global business include:

• changes in medical reimbursement policies and programs and pricing restrictions in key markets;

• multiple regulatory requirements that could restrict the Company’s ability to manufacture and sell its products in key markets;

• trade protection measures and import or export licensing requirements, including the imposition of trade sanctions or similar restrictions by the United States or other governments;

• foreign exchange fluctuations;

• diminished protection of intellectual property in some countries; and

• possible nationalization and expropriation.

In addition, there may be changes to the Company’s business and political position if there is instability, disruption or destruction in a significant geographic region, regardless of cause, including war, terrorism, riot, civil insurrection or social unrest; and natural or man-made disasters, including famine, flood, fire, earthquake, storm or disease.

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In 2016, the United Kingdom (UK) held a referendum in which voters approved an exit from the EU, commonly referred to as “Brexit.” As a result of that referendum and subsequent negotiations, the UK left the EU on January 31, 2020. A transitional period will apply from January 31, 2020 until December 31, 2020, and during this period the EU will treat the UK as if it were an EU Member State, and the UK will continue to participate in the EU Customs Union allowing for the freedom of movement for people and goods. During the transitional period the EU and the UK will continue to negotiate a trade agreement to formalize the terms of the UK’s future relationship with the EU. The Company has taken actions and made certain contingency plans for scenarios in which the UK and the EU do not reach a mutually satisfactory understanding as to a future trade agreement. It is not possible at this time to predict whether there will be any such understanding before the end of 2020, or if such an understanding is reached, whether its terms will vary in ways that result in greater restrictions on imports and exports between the UK and EU countries, increased regulatory complexities, and/or cross border labor issues that could materially adversely impact the Company’s business operations in the UK.

Failure to attract and retain highly qualified personnel could affect the Company’s ability to successfully develop and commercialize products.

The Company’s success is largely dependent on its continued ability to attract and retain highly qualified scientific, technical and management personnel, as well as personnel with expertise in clinical research and development, governmental regulation and commercialization. Competition for qualified personnel in the pharmaceutical industry is intense. The Company cannot be sure that it will be able to attract and retain quality personnel or that the costs of doing so will not materially increase.

In the past, the Company has experienced difficulties and delays in manufacturing certain of its products, including vaccines.

Merck has, in the past, experienced difficulties in manufacturing certain of its products, including vaccines. In addition, the network cyber-attack experienced by the Company in June 2017 led to a disruption of the Company’s operations, including its manufacturing operations. The Company may, in the future, experience difficulties and delays inherent in manufacturing its products, such as (i) failure of the Company or any of its vendors or suppliers to comply with Current Good Manufacturing Practices and other applicable regulations and quality assurance guidelines that could lead to manufacturing shutdowns, product shortages and delays in product manufacturing; (ii) delays related to the construction of new facilities or the expansion of existing facilities, including those intended to support future demand for the Company’s products; and (iii) other manufacturing or distribution problems including changes in manufacturing production sites and limits to manufacturing capacity due to regulatory requirements, changes in types of products produced, or physical limitations that could impact continuous supply. In addition, the Company could experience difficulties or delays in manufacturing its products caused by natural disasters, such as hurricanes. For example, in 2017, the Company’s lone manufacturing plant in Puerto Rico was negatively affected by Hurricane Maria. Manufacturing difficulties can result in product shortages, leading to lost sales and reputational harm to the Company.

The Company may not be able to realize the expected benefits of its investments in emerging markets.

The Company has been taking steps to increase its sales in emerging markets. However, there is no guarantee that the Company’s efforts to expand sales in these markets will succeed. Some countries within emerging markets may be especially vulnerable to periods of global financial instability or may have very limited resources to spend on health care. In order for the Company to successfully implement its emerging markets strategy, it must attract and retain qualified personnel. The Company may also be required to increase its reliance on third-party agents within less developed markets. In addition, many of these countries have currencies that fluctuate substantially and, if such currencies devalue and the Company cannot offset the devaluations, the Company’s financial performance within such countries could be adversely affected.

The Company’s business in China has grown rapidly in the past few years, and the importance of China to the Company’s overall pharmaceutical and vaccines business outside the United States has increased accordingly. Continued growth of the Company’s business in China is dependent upon ongoing development of a favorable environment for innovative pharmaceutical products and vaccines, sustained access for the Company’s currently marketed products, and the absence of trade impediments or adverse pricing controls. As noted above in “Health Care Environment and Government Regulation,” pricing pressure in China has increased as the Chinese government has been taking steps to reduce costs, including implementing healthcare reform that has led to the acceleration of generic

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substitution, where available. While pricing pressure has always existed in China, health care reform has increased this pressure in part due to the acceleration of generic substitution through the government’s VBP program. In 2019, the government implemented the VBP program through a tendering process for mature products which have generic substitutes with a Generic Quality Consistency Evaluation approval. Mature products that have entered into the first two rounds of VBP had, on average, a price reduction of 50%. The expansion of the VBP program remains to be seen. In addition, the Company anticipates that the reported inquiries made by various governmental authorities involving multinational pharmaceutical companies in China may continue.

Also, in December 2019, a new Coronavirus, now known as COVID-19, which has proved to be highly contagious, emerged in Wuhan, China. The outbreak of the virus has caused material disruptions to the Chinese economy, including its health care system, which will have a negative effect on the Company’s first quarter 2020 results which, at this time, is not expected to be material. Since the future course and duration of the COVID-19 outbreak are unknown, the Company is currently unable to determine whether the outbreak will have a further negative effect on the Company’s results in 2020. The outbreak of COVID-19 currently has also had a limited effect on the Company’s supply chain of drugs into and raw materials out of China. The outbreak has also negatively affected certain of the Company’s clinical trials.

For all these reasons, sales within emerging markets carry significant risks. However, a failure to maintain the Company’s presence in emerging markets could have a material adverse effect on the Company’s business, cash flow, results of operations, financial condition and prospects.

The Company is exposed to market risk from fluctuations in currency exchange rates and interest rates.

The Company operates in multiple jurisdictions and virtually all sales are denominated in currencies of the local jurisdiction. Additionally, the Company has entered and will enter into business development transactions, borrowings or other financial transactions that may give rise to currency and interest rate exposure.

Since the Company cannot, with certainty, foresee and mitigate against such adverse fluctuations, fluctuations in currency exchange rates, interest rates and inflation could negatively affect the Company’s business, cash flow, results of operations, financial condition and prospects.

In order to mitigate against the adverse impact of these market fluctuations, the Company will from time to time enter into hedging agreements. While hedging agreements, such as currency options and forwards and interest rate swaps, may limit some of the exposure to exchange rate and interest rate fluctuations, such attempts to mitigate these risks may be costly and not always successful.

Certain of the Company’s interest rate derivatives and investments are based on the London Interbank Offered Rate (LIBOR), and a portion of Merck’s indebtedness bears interest at variable interest rates, primarily based on LIBOR. LIBOR is the subject of recent national, international and other regulatory guidance and proposals for reform, which may cause LIBOR to cease to exist entirely after 2021. While the Company expects that reasonable alternatives to LIBOR will be implemented prior to the 2021 target date, the Company cannot predict the consequences and timing of these developments, which could include an increase in interest expense and may also require the amendment of contracts that reference LIBOR.

The Company is subject to evolving and complex tax laws, which may result in additional liabilities that may affect results of operations and financial condition.

The Company is subject to evolving and complex tax laws in the jurisdictions in which it operates. Significant judgment is required for determining the Company’s tax liabilities, and the Company’s tax returns are periodically examined by various tax authorities. The Company believes that its accrual for tax contingencies is adequate for all open years based on past experience, interpretations of tax law, and judgments about potential actions by tax authorities; however, due to the complexity of tax contingencies, the ultimate resolution of any tax matters may result in payments greater or less than amounts accrued. In addition, the Company may be negatively affected by changes in tax laws, or new tax laws, affecting, for example, tax rates, and/or revised tax law interpretations in domestic or foreign jurisdictions.

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Pharmaceutical products can develop unexpected safety or efficacy concerns.

Unexpected safety or efficacy concerns can arise with respect to marketed products, whether or not scientifically justified, leading to product recalls, withdrawals, or declining sales, as well as product liability, consumer fraud and/or other claims, including potential civil or criminal governmental actions.

Reliance on third-party relationships and outsourcing arrangements could materially adversely affect the Company’s business.

The Company depends on third parties, including suppliers, alliances with other pharmaceutical and biotechnology companies, and third-party service providers, for key aspects of its business including development, manufacture and commercialization of its products and support for its IT systems. Failure of these third parties to meet their contractual, regulatory and other obligations to the Company or the development of factors that materially disrupt the relationships between the Company and these third parties could have a material adverse effect on the Company’s business.

Negative events in the animal health industry could have a material adverse effect on future results of operations and financial condition.

Future sales of key animal health products could be adversely affected by a number of risk factors including certain risks that are specific to the animal health business. For example, the outbreak of disease carried by animals, such as African Swine Fever, could lead to their widespread death and precautionary destruction as well as the reduced consumption and demand for animals, which could adversely affect the Company’s results of operations. Also, the outbreak of any highly contagious diseases near the Company’s main production sites could require the Company to immediately halt production of vaccines at such sites or force the Company to incur substantial expenses in procuring raw materials or vaccines elsewhere. Other risks specific to animal health include epidemics and pandemics, government procurement and pricing practices, weather and global agribusiness economic events. As the Animal Health segment of the Company’s business becomes more significant, the impact of any such events on future results of operations would also become more significant.

Biologics and vaccines carry unique risks and uncertainties, which could have a material adverse effect on the Company’s future results of operations and financial condition.

The successful development, testing, manufacturing and commercialization of biologics and vaccines, particularly human and animal health vaccines, is a long, complex, expensive and uncertain process. There are unique risks and uncertainties related to biologics and vaccines, including:

• There may be limited access to, and supply of, normal and diseased tissue samples, cell lines, pathogens, bacteria, viral strains and other biological materials. In addition, government regulations in multiple jurisdictions, such as the United States and the EU, could result in restricted access to, or transport or use of, such materials. If the Company loses access to sufficient sources of such materials, or if tighter restrictions are imposed on the use of such materials, the Company may not be able to conduct research activities as planned and may incur additional development costs.

• The development, manufacturing and marketing of biologics and vaccines are subject to regulation by the FDA, the EMA and other regulatory bodies. These regulations are often more complex and extensive than the regulations applicable to other pharmaceutical products. For example, in the United States, a BLA, including both pre-clinical and clinical trial data and extensive data regarding the manufacturing procedures, is required for human vaccine candidates, and FDA approval is generally required for the release of each manufactured commercial lot.

• Manufacturing biologics and vaccines, especially in large quantities, is often complex and may require the use of innovative technologies to handle living micro-organisms. Each lot of an approved biologic and vaccine must undergo thorough testing for identity, strength, quality, purity and potency. Manufacturing biologics requires facilities specifically designed for and validated for this purpose, and sophisticated quality assurance and quality control procedures are necessary. Slight deviations anywhere in the manufacturing process, including filling, labeling, packaging, storage and shipping and quality control and testing, may result in lot failures, product recalls or spoilage. When changes are made to

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the manufacturing process, the Company may be required to provide pre-clinical and clinical data showing the comparable identity, strength, quality, purity or potency of the products before and after such changes.

• Biologics and vaccines are frequently costly to manufacture because production ingredients are derived from living animal or plant material, and most biologics and vaccines cannot be made synthetically. In particular, keeping up with the demand for vaccines may be difficult due to the complexity of producing vaccines.

• The use of biologically derived ingredients can lead to variability in the manufacturing process and could lead to allegations of harm, including infections or allergic reactions, which allegations would be reviewed through a standard investigation process that could lead to closure of product facilities due to possible contamination. Any of these events could result in substantial costs.

Product liability insurance for products may be limited, cost prohibitive or unavailable.

As a result of a number of factors, product liability insurance has become less available while the cost of such insurance has increased significantly. The Company is subject to a substantial number of product liability claims. See Item 8. “Financial Statements and Supplementary Data,” Note 10. “Contingencies and Environmental Liabilities” below for more information on the Company’s current product liability litigation. With respect to product liability, the Company self-insures substantially all of its risk, as the availability of commercial insurance has become more restrictive. 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. The Company will continually assess the most efficient means to address its risk; however, there can be no guarantee that insurance coverage will be obtained or, if obtained, will be sufficient to fully cover product liabilities that may arise.

Social media platforms present risks and challenges.

The inappropriate and/or unauthorized use of certain social media channels could cause brand damage or information leakage or could lead to legal implications, including from the improper collection and/or dissemination of personally identifiable information. In addition, negative or inaccurate posts or comments about the Company or its products on any social networking platforms could damage the Company’s reputation, brand image and goodwill. Further, the disclosure of non-public Company-sensitive information by the Company’s workforce or others through external media channels could lead to information loss. Although there is an internal Company Social Media Policy that guides employees on appropriate personal and professional use of social media about the Company, the processes in place may not completely secure and protect information. Identifying new points of entry as social media continues to expand also presents new challenges.

Risks Related to the Proposed Spin-Off of NewCo.

The proposed Spin-Off of NewCo may not be completed on the terms or timeline currently contemplated, if at all, and may not achieve the expected results.

In February 2020, the Company announced its intention to Spin-Off products from its women’s health, trusted legacy brands and biosimilars businesses into a new, yet-to-be-named, independent, publicly traded company (NewCo) through a distribution of NewCo’s publicly traded stock to Company shareholders. The distribution is expected to qualify as tax-free to the Company and its shareholders for U.S. federal income tax purposes. The transaction is expected to be completed in the first half of 2021. Completion of the Spin-Off will be subject to a number of factors and conditions, and there can be no assurances that the Company will be able to complete the Spin-Off on the terms or on the timeline that was announced, if at all. Unanticipated developments could delay, prevent or otherwise adversely affect the proposed Spin-Off, including but not limited to disruptions in general or financial market conditions or potential problems or delays in obtaining various regulatory and tax approvals or clearances. In addition, consummation of the proposed Spin-Off will require final approval from the Company’s Board of Directors.

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The costs to complete the proposed Spin-Off will be significant. In addition, the Company may be unable to achieve some or all of the strategic and financial benefits that it expects to achieve from the Spin-Off of NewCo.

The Company will incur significant expenses in connection with the Spin-Off. In addition, the Company may not be able to achieve the full strategic and financial benefits that are expected to result from the Spin-Off. The anticipated benefits of the Spin-Off are based on a number of assumptions, some of which may prove incorrect.

Following the Spin-Off, the price of shares of the Company’s common stock may fluctuate significantly.

The Company cannot predict the effect of the Spin-Off on the trading price of shares of its common stock, and the market value of shares of its common stock may be less than, equal to or greater than the market value of shares of its common stock prior to the Spin-Off. In addition, the price of Merck’s common stock may be more volatile around the time of the Spin-Off.

There could be significant income tax liability if the Spin-Off or certain related transactions are determined to be taxable for U.S. federal income tax purposes.

The Company expects that prior to completion of the Spin-Off it will receive an opinion from its U.S. tax counsel that concludes, among other things, that the Spin-Off of all of the outstanding NewCo shares to Merck shareholders and certain related transactions will qualify as tax-free to Merck and its shareholders under Sections 355, 361 and 368 of the U.S. Internal Revenue Code, except to the extent of any cash received in lieu of fractional shares of NewCo common stock. Any such opinion is not binding on the Internal Revenue Service (IRS). Accordingly, while the Company believes the risk is low, the IRS may reach conclusions with respect to the Spin-Off that are different from the conclusions reached in the opinion. The opinion will rely on certain facts, assumptions, representations and undertakings from Merck and NewCo regarding the past and future conduct of the companies’ respective businesses and other matters, which, if incomplete, incorrect or not satisfied, could alter the conclusions of the party giving such opinion.

If the proposed Spin-Off ultimately is determined to be taxable, which the Company believes is unlikely, the Spin-Off could be treated as a taxable dividend to Merck’s shareholders for U.S. federal income tax purposes, and Merck’s shareholders could incur significant U.S. federal income tax liabilities. In addition, Merck would recognize a taxable gain to the extent that the fair market value of NewCo common stock exceeds Merck’s tax basis in such stock on the date of the Spin-Off.

Cautionary Factors that May Affect Future Results

(Cautionary Statements Under the Private Securities Litigation Reform Act of 1995)

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, or negative variations of any of the foregoing. 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. The Company cautions you not to place undue reliance on these forward-looking statements. Although it is not possible to predict or identify all such factors, they may include the following:

•Competition from generic and/or biosimilar products as the Company’s products lose patent protection.

•Increased “brand” competition in therapeutic areas important to the Company’s long-term business performance.

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•The difficulties and uncertainties inherent in new product development. The outcome of the lengthy and complex process of new product development is inherently uncertain. A drug candidate can fail at any stage of the process and one or more late-stage product candidates could fail to receive regulatory approval. New product candidates may appear promising in development but fail to reach the market because of efficacy or safety concerns, the inability to obtain necessary regulatory approvals, the difficulty or excessive cost to manufacture and/or the infringement of patents or intellectual property rights of others. Furthermore, the sales of new products may prove to be disappointing and fail to reach anticipated levels.

•Pricing pressures, both in the United States and abroad, including rules and practices of managed care groups, judicial decisions and governmental laws and regulations related to Medicare, Medicaid and health care reform, pharmaceutical reimbursement and pricing in general.

•Changes in government laws and regulations, including laws governing intellectual property, and the enforcement thereof affecting the Company’s business.

•Efficacy or safety concerns with respect to marketed products, whether or not scientifically justified, leading to product recalls, withdrawals or declining sales.

•Significant changes in customer relationships or changes in the behavior and spending patterns of purchasers of health care products and services, including delaying medical procedures, rationing prescription medications, reducing the frequency of physician visits and foregoing health care insurance coverage.

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

•Cyber-attacks on the Company’s or third-party providers’ information technology systems, which could disrupt the Company’s operations.

•Lost market opportunity resulting from delays and uncertainties in the approval process of the FDA and foreign regulatory authorities.

•Increased focus on privacy issues in countries around the world, including the United States and the EU. The legislative and regulatory landscape for privacy and data protection continues to evolve, and there has been an increasing amount of focus on privacy and data protection issues with the potential to affect directly the Company’s business, including recently enacted laws in a majority of states in the United States requiring security breach notification.

•Changes in tax laws including changes related to the taxation of foreign earnings.

•Changes in accounting pronouncements promulgated by standard-setting or regulatory bodies, including the Financial Accounting Standards Board and the SEC, that are adverse to the Company.

•Economic factors over which the Company has no control, including changes in inflation, interest rates and foreign currency exchange rates.

•The proposed Spin-Off might be delayed or the costs to complete the Spin-Off might be more significant than expected.

This list should not be considered an exhaustive statement of all potential risks and uncertainties. See “Risk Factors” above.

Item 1B. Unresolved Staff Comments.

None.

Item 2. Properties.

The Company’s corporate headquarters is located in Kenilworth, New Jersey. The Company also maintains operational or divisional headquarters in Kenilworth, New Jersey, Madison, New Jersey and Upper Gwynedd, Pennsylvania. Principal U.S. research facilities are located in Rahway and Kenilworth, New Jersey, West Point, Pennsylvania, Palo Alto, California, Boston, Massachusetts, South San Francisco, California and Elkhorn, Nebraska (Animal Health). Principal research facilities outside the United States are located in the United Kingdom, Switzerland

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and China. Merck’s manufacturing operations are headquartered in Whitehouse Station, New Jersey. The Company also has production facilities for human health products at nine locations in the United States and Puerto Rico. Outside the United States, through subsidiaries, the Company owns or has an interest in manufacturing plants or other properties in Japan, Singapore, South Africa, and other countries in Western Europe, Central and South America, and Asia.

Capital expenditures were $3.5 billion in 2019, $2.6 billion in 2018 and $1.9 billion in 2017. In the United States, these amounted to $1.9 billion in 2019, $1.5 billion in 2018 and $1.2 billion in 2017. Abroad, such expenditures amounted to $1.6 billion in 2019, $1.1 billion in 2018 and $728 million in 2017.

The Company and its subsidiaries own their principal facilities and manufacturing plants under titles that they consider to be satisfactory. The Company believes that its properties are in good operating condition and that its machinery and equipment have been well maintained. The Company believes that its plants for the manufacture of products are suitable for their intended purposes and have capacities and projected capacities, including previously-disclosed capital expansion projects, that will be adequate for current and projected needs for existing Company products. Some capacity of the plants is being converted, with any needed modification, to the requirements of newly introduced and future products.

Item 3. Legal Proceedings.

The information called for by this Item is incorporated herein by reference to Item 8. “Financial Statements and Supplementary Data,” Note 10. “Contingencies and Environmental Liabilities”.

Item 4. Mine Safety Disclosures.

Not Applicable.

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Executive Officers of the Registrant (ages as of February 1, 2020)

All officers listed below serve at the pleasure of the Board of Directors. None of these officers was elected pursuant to any arrangement or understanding between the officer and any other person(s).

Name	Age	Offices and Business Experience
Kenneth C. Frazier	65	Chairman, President and Chief Executive Officer (since December 2011)
Sanat Chattopadhyay	60	Executive Vice President and President, Merck Manufacturing Division (since March 2016); Senior Vice President, Operations, Merck Manufacturing Division (November 2009-March 2016)
Frank Clyburn	55	Executive Vice President, Chief Commercial Officer (since January 2019); President, Global Oncology Business Unit (October 2013-December 2018)
Robert M. Davis	53	Executive Vice President, Global Services, and Chief Financial Officer (since April 2016); Executive Vice President and Chief Financial Officer (April 2014-April 2016)
Richard R. DeLuca, Jr.	57	Executive Vice President and President, Merck Animal Health (since September 2011)
Michael W. Fleming	61	Senior Vice President, Chief Ethics and Compliance Officer (since March 2019); Senior Vice President, International Legal and Compliance (January 2017-March 2019); Vice President, International Legal and Compliance (July 2008-January 2017)
Julie L. Gerberding	64	Executive Vice President and Chief Patient Officer, Strategic Communications, Global Public Policy and Population Health (since July 2016); Executive Vice President for Strategic Communications, Global Public Policy and Population Health (January 2015-July 2016)
Rita A. Karachun	56	Senior Vice President Finance - Global Controller (since March 2014)
Steven C. Mizell	59	Executive Vice President, Chief Human Resources Officer (since October 2018); Executive Vice President, Chief Human Resources Officer (December 2016-October 2018) and Executive Vice President, Human Resources, Monsanto Company (August 2011-December 2016)
Michael T. Nally	44	Executive Vice President, Chief Marketing Officer (since January 2019); President, Global Vaccines, Global Human Health (September 2016-January 2019); Managing Director, United Kingdom and Ireland, Global Human Health (January 2014-September 2016)
Roger M. Perlmutter, M.D., Ph.D.	67	Executive Vice President and President, Merck Research Laboratories (since April 2013)
Jennifer Zachary	42	Executive Vice President, General Counsel and Corporate Secretary (since January 2020); Executive Vice President and General Counsel (April 2018-January 2020); Partner, Covington & Burling LLP (January 2013-March 2018)

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

The principal market for trading of the Company’s Common Stock is the New York Stock Exchange (NYSE) under the symbol MRK.

As of January 31, 2020, there were approximately 109,500 shareholders of record of the Company’s Common Stock.

Issuer purchases of equity securities for the three months ended December 31, 2019 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)
October 1 — October 31	5,064,526	$83.63	$7,796
November 1 — November 30	4,182,277	$84.72	$7,441
December 1 — December 31	3,053,800	$89.16	$7,169
Total	12,300,603	$85.37	$7,169

⁽¹⁾  All shares purchased during the period were made as part of a plan approved by the Board of Directors in October 2018 to purchase up to $10 billion in Merck shares for its treasury.

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Performance Graph

The following graph assumes a $100 investment on December 31, 2014, and reinvestment of all dividends, in each of the Company’s Common Shares, the S&P 500 Index, and a composite peer group of major U.S. and European-based pharmaceutical companies, which are: AbbVie Inc., Amgen Inc., AstraZeneca plc, Bristol-Myers Squibb Company, Johnson & Johnson, Eli Lilly and Company, GlaxoSmithKline plc, Novartis AG, Pfizer Inc., Roche Holding AG, and Sanofi SA.

Comparison of Five-Year Cumulative Total Return*

Merck & Co., Inc., Composite Peer Group and S&P 500 Index

	End of Period Value	2019/2014 CAGR*
MERCK	$187	13%
PEER GRP.**	152	9%
S&P 500	174	12%

	2014	2015	2016	2017	2018	2019
MERCK	100.0	96.0	110.5	108.8	152.5	186.5
PEER GRP.	100.0	103.0	99.9	119.6	127.8	151.6
S&P 500	100.0	101.4	113.5	138.3	132.2	173.8

* Compound Annual Growth Rate

** Peer group average was calculated on a market cap weighted basis.

This Performance Graph will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, except to the extent that the Company specifically incorporates it by reference. In addition, the Performance Graph will not be deemed to be “soliciting material” or to be “filed” with the SEC or subject to Regulation 14A or 14C, other than as provided in Regulation S-K, or to the liabilities of section 18 of the Securities Exchange Act of 1934, except to the extent that the Company specifically requests that such information be treated as soliciting material or specifically incorporates it by reference into a filing under the Securities Act or the Exchange Act.

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Item 6. Selected Financial Data.                        

The following selected financial data should be read in conjunction with Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and consolidated financial statements and notes thereto contained in Item 8. “Financial Statements and Supplementary Data” of this report.

Merck & Co., Inc. and Subsidiaries

($ in millions except per share amounts)

	2019 (1)			2018 (2)			2017 (3)			2016 (4)		2015 (5)
Results for Year:
Sales	$	46,840		$	42,294		$	40,122		$	39,807	$	39,498
Cost of sales	14,112			13,509			12,912			14,030		15,043
Selling, general and administrative	10,615			10,102			10,074			10,017		10,508
Research and development	9,872			9,752			10,339			10,261		6,796
Restructuring costs	638			632			776			651		619
Other (income) expense, net	139			(402		)	(500		)	189		1,131
Income before taxes	11,464			8,701			6,521			4,659		5,401
Taxes on income	1,687			2,508			4,103			718		942
Net income	9,777			6,193			2,418			3,941		4,459
Less: Net (loss) income attributable to noncontrolling interests	(66		)	(27		)	24			21		17
Net income attributable to Merck & Co., Inc.	9,843			6,220			2,394			3,920		4,442
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders	$	3.84		$	2.34		$	0.88		$	1.42	$	1.58
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders	$	3.81		$	2.32		$	0.87		$	1.41	$	1.56
Cash dividends declared	5,820			5,313			5,177			5,135		5,115
Cash dividends declared per common share	$	2.26		$	1.99		$	1.89		$	1.85	$	1.81
Capital expenditures	3,473			2,615			1,888			1,614		1,283
Depreciation	1,679			1,416			1,455			1,611		1,593
Average common shares outstanding (millions)	2,565			2,664			2,730			2,766		2,816
Average common shares outstanding assuming dilution (millions)	2,580			2,679			2,748			2,787		2,841
Year-End Position:
Working capital	$	5,263		$	3,669		$	6,152		$	13,410	$	10,550
Property, plant and equipment, net	15,053			13,291			12,439			12,026		12,507
Total assets	84,397			82,637			87,872			95,377		101,677
Long-term debt	22,736			19,806			21,353			24,274		23,829
Total equity	26,001			26,882			34,569			40,308		44,767
Year-End Statistics:
Number of stockholders of record	110,023			115,800			121,700			129,500		135,500
Number of employees	71,000			69,000			69,000			68,000		68,000

⁽¹⁾  Amounts for 2019 include a charge for the acquisition of Peloton Therapeutics, Inc.

⁽²⁾  Amounts for 2018 include a charge related to the formation of a collaboration with Eisai Co., Ltd.

⁽³⁾  Amounts for 2017 include a provisional net tax charge related to the enactment of U.S. tax legislation and a charge related to the formation of a collaboration with AstraZeneca PLC.

⁽⁴⁾  Amounts for 2016 include a charge related to the settlement of worldwide patent litigation related to Keytruda.

⁽⁵⁾  Amounts for 2015 include a net charge related to the settlement of Vioxx shareholder class action litigation, foreign exchange losses related to Venezuela, gains on the dispositions of businesses and other assets, and the favorable benefit of certain tax items.

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following section of this Form 10-K generally discusses 2019 and 2018 results and year-to-year comparisons between 2019 and 2018. Discussion of 2017 results and year-to-year comparisons between 2018 and 2017 that are not included in this Form 10-K can be found in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Part II, Item 7 of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018 filed on February 27, 2019.

Description of Merck’s Business

Merck & Co., Inc. (Merck or the Company) is a global health care company that delivers innovative health solutions through its prescription medicines, vaccines, biologic therapies and animal health products. The Company’s operations are principally managed on a products basis and include four operating segments, which are the Pharmaceutical, Animal Health, Healthcare Services and Alliances segments. The Pharmaceutical and Animal Health segments are the only reportable segments.

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. Human health 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.

The Animal Health segment discovers, develops, manufactures and markets a wide range of veterinary pharmaceutical and vaccine products, as well as health management solutions and services, for the prevention, treatment and control of disease in all major livestock and companion animal species. The Company also offers an extensive suite of digitally connected identification, traceability and monitoring products. The Company sells its products to veterinarians, distributors and animal producers.

The 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. The Company has recently sold certain businesses in the Healthcare Services segment and is in the process of divesting the remaining businesses. While the Company continues to look for investment opportunities in this area of health care, the approach to these investments has shifted toward venture capital investments in third parties as opposed to wholly-owned businesses.

The Alliances segment primarily includes activity from the Company’s relationship with AstraZeneca LP related to sales of Nexium and Prilosec, which concluded in 2018.

Planned Spin-Off of Women’s Health, Legacy Brands and Biosimilars into New Company

In February 2020, Merck announced its intention to spin-off products from its women’s health, trusted legacy brands and biosimilars businesses into a new, yet-to-be-named, independent, publicly traded company (NewCo) through a distribution of NewCo’s publicly traded stock to Company shareholders. The distribution is expected to qualify as tax-free to the Company and its shareholders for U.S. federal income tax purposes. The legacy brands included in the transaction consist of dermatology, pain, respiratory, and select cardiovascular products including Zetia and Vytorin, as well as the rest of Merck’s diversified brands franchise. Merck’s existing research pipeline programs will continue to be owned and developed within Merck as planned. NewCo will have development capabilities initially focused on late-stage development and life-cycle management, and is expected over time to develop research capabilities in selected therapeutic areas. The spin-off is expected to be completed in the first half of 2021, subject to market and certain other conditions.

Overview

Merck’s performance during 2019 demonstrates execution in both commercial and research operations driven by a focus on key growth drivers and innovative pipeline investment reinforcing the Company’s science-led strategy. In 2019, Merck enhanced its portfolio and pipeline with external innovation, increased investment in new capital projects focused primarily on expanding manufacturing capacity across Merck’s key businesses, and returned capital to shareholders.

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Worldwide sales were $46.8 billion in 2019, an increase of 11% compared with 2018, including a 2% unfavorable effect from foreign exchange. The sales increase was driven primarily by Merck’s growth pillars of oncology, human health vaccines, certain hospital acute care products, and animal health. Growth in these areas was partially offset by the ongoing effects of generic competition, particularly in the diversified brands and cardiovascular franchises, as well as by competitive pressure, particularly in the diabetes and virology franchises.

Merck continued to prioritize business development aimed at enhancing its portfolio and strengthening its pipeline by executing several business development transactions in 2019. To expand its oncology presence, Merck completed the acquisitions of Peloton Therapeutics, Inc. (Peloton), a clinical-stage biopharmaceutical company focused on the development of novel small molecule therapeutic candidates for the treatment of cancer and other diseases, and Immune Design, a late-stage immunotherapy company employing next-generation in vivo approaches to enable the body’s immune system to fight disease. Merck also announced an agreement to acquire ArQule, Inc. (ArQule), a biopharmaceutical company focused on kinase inhibitor discovery and development for the treatment of cancer and other diseases; the acquisition closed in January 2020. To augment Merck’s animal health business, the Company acquired Antelliq Group (Antelliq), a leader in digital animal identification, traceability and monitoring solutions.

During 2019, the Company received numerous regulatory approvals and progressed many important pipeline candidates through clinical development. Within oncology, Keytruda received multiple additional approvals in the United States, European Union (EU), China and Japan as monotherapy in the therapeutic areas of non-small-cell lung cancer (NSCLC), small-cell lung cancer (SCLC), esophageal cancer and in combination with axitinib for the treatment of renal cell carcinoma (RCC), in combination with chemotherapy for head and neck squamous cell carcinoma (HNSCC), and in combination with Lenvima for endometrial carcinoma. Lynparza, which is being developed in collaboration with AstraZeneca PLC (AstraZeneca), received U.S. Food and Drug Administration (FDA) approval for the treatment of appropriate patients with germline BRCA-mutated (gBRCAm) pancreatic cancer and European Commission (EC) approval for use in certain patients with advanced ovarian cancer and advanced or metastatic breast cancer.

In addition to oncology, the Company received regulatory approvals in the hospital acute care and vaccines therapeutic areas. The FDA approved Recarbrio (imipenem, cilastatin, and relebactam) for injection, a new combination antibacterial for the treatment of certain patients with complicated urinary tract infections caused by certain Gram-negative microorganisms. Recarbrio was approved by the EC in February 2020. The FDA and EC also approved expanded indications for Zerbaxa for the treatment of patients with hospital-acquired bacterial pneumonia and ventilator-associated bacterial pneumonia (HABP/VABP) caused by certain susceptible Gram-negative microorganisms. Additionally, Ervebo (Ebola Zaire Vaccine, Live), a vaccine for the prevention of disease caused by Zaire ebolavirus in adults, was approved in the United States and received conditional approval in the EU.

In addition to the recent regulatory approvals discussed above, the Company advanced its late-stage pipeline, particularly in oncology, with several regulatory submissions for Keytruda, Lynparza and Lenvima in the United States and internationally. The Company’s Phase 3 oncology programs include Keytruda in the therapeutic areas of biliary tract, breast, cervical, colorectal, cutaneous squamous cell, endometrial, esophageal, gastric, hepatocellular, mesothelioma, nasopharyngeal, ovarian, prostate and small-cell lung cancers; Lynparza in combination with Keytruda for non-small cell lung cancer; and Lenvima in combination with Keytruda for bladder, endometrial, head and neck, melanoma and non-small-cell lung cancers. Additionally, the Company has candidates in Phase 3 clinical development in several other therapeutic areas, including V114, an investigational polyvalent conjugate vaccine for the prevention of pneumococcal disease that received Breakthrough Therapy designation from the FDA for the prevention of invasive pneumococcal disease caused by the vaccine serotypes in pediatric patients (6 weeks to 18 years of age) and in adults; MK-7264, gefapixant, a selective, non-narcotic, orally-administered P2X3-receptor antagonist being developed for the treatment of refractory, chronic cough; MK-8591A, islatravir, an investigational nucleoside reverse transcriptase translocation inhibitor (NRTTI) in combination with doravirine for the treatment of HIV-1 infection; and MK-1242, vericiguat, an investigational treatment for heart failure being developed in a collaboration (see “Research and Development” below).

The Company is allocating resources to effectively support its commercial opportunities in the near term while making the necessary investments to support long-term growth. Research and development expenses in 2019 reflect higher clinical development spending and increased investment in discovery research and early drug development.

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In November 2019, Merck’s Board of Directors approved an increase to the Company’s quarterly dividend, raising it to $0.61 per share from $0.55 per share on the Company’s outstanding common stock. During 2019, the Company returned $10.5 billion to shareholders through dividends and share repurchases.

Earnings per common share assuming dilution attributable to common shareholders (EPS) for 2019 were $3.81 compared with $2.32 in 2018. EPS in both years reflects the impact of acquisition and divestiture-related costs, as well as restructuring costs and certain other items. Certain other items in 2019 include a charge related to the acquisition of Peloton and in 2018 include a charge related to the formation of a collaboration with Eisai Co., Ltd. (Eisai). Non-GAAP EPS, which excludes these items, was $5.19 in 2019 and $4.34 in 2018 (see “Non-GAAP Income and Non-GAAP EPS” below).

Pricing

Global efforts toward health care cost containment continue to exert pressure on product pricing and market access worldwide. Changes to the U.S. health care system as part of health care reform, as well as increased purchasing power of entities that negotiate on behalf of Medicare, Medicaid, and private sector beneficiaries, have contributed to pricing pressure. In several international markets, government-mandated pricing actions have reduced prices of generic and patented drugs. In addition, the Company’s revenue performance in 2019 was negatively affected by other cost-reduction measures taken by governments and other third-parties to lower health care costs. The Company anticipates all of these actions and additional actions in the future will continue to negatively affect revenue performance.

Operating Results

Sales

($ in millions)	2019		% Change		% Change Excluding Exchange		2018		% Change		% Change Excluding Exchange		2017
United States	$	20,325	12	%	12	%	$	18,212	5	%	5	%	$	17,424
International	26,515		10	%	13	%	24,083		6	%	6	%	22,698
Total	$	46,840	11	%	13	%	$	42,294	5	%	5	%	$	40,122

U.S. plus international may not equal total due to rounding.

Worldwide sales grew 11% in 2019 driven primarily by higher sales in the oncology franchise reflecting strong growth of Keytruda, as well as increased alliance revenue related to Lynparza and Lenvima. Also contributing to revenue growth were higher sales of vaccines, including Gardasil/Gardasil 9, Varivax, ProQuad and M‑M‑R II, as well as increased sales of certain hospital acute care products, including Bridion. Higher sales of animal health products also drove revenue growth in 2019.

Sales growth in 2019 was partially offset by the effects of generic competition for cardiovascular products Zetia and Vytorin, hospital acute care products Invanz, Cubicin and Noxafil, oncology product Emend, and products within the diversified brands franchise, as well as biosimilar competition for immunology product Remicade. The diversified brands franchise includes certain products that are approaching the expiration of their marketing exclusivity or that are no longer protected by patents in developed markets. Lower sales of diabetes products Januvia and Janumet and HIV products Isentress/Isentress HD also partially offset revenue growth in 2019.

Sales in the United States grew 12% in 2019 driven primarily by higher sales of Keytruda, combined sales of ProQuad, M-M-R II and Varivax, and Bridion, as well as higher alliance revenue from Lenvima and Lynparza. Revenue growth was partially offset by lower sales of Januvia, Janumet, Invanz, Emend, Isentress/Isentress HD, Cubicin and Noxafil.

International sales grew 10% in 2019. Performance in international markets was led by China, which had total sales of $3.2 billion in 2019, representing growth of 47% compared with 2018, including a 7% unfavorable effect from foreign exchange. The increase in international sales primarily reflects growth in Keytruda, Gardasil/Gardasil 9, combined sales of ProQuad, M-M-R II and Varivax, as well as higher alliance revenue from Lynparza and Lenvima. Sales growth was partially offset by lower sales of Zetia, Vytorin, Zepatier, Remicade, and products within the diversified brands franchise. International sales represented 57% of total sales in both 2019 and 2018.

See Note 18 to the consolidated financial statements for details on sales of the Company’s products. A discussion of performance for select products in the franchises follows.

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Pharmaceutical Segment

Oncology

($ in millions)	2019		% Change		% Change Excluding Exchange		2018		% Change		% Change Excluding Exchange		2017
Keytruda	$	11,084	55	%	58	%	$	7,171	88	%	88	%	$	3,809
Alliance Revenue - Lynparza (1)	444		137	%	141	%	187		*		*		20
Alliance Revenue - Lenvima (1)	404		171	%	173	%	149		N/A		N/A		—
Emend	388		(26	)%	(24	)%	522		(6	)%	(7	)%	556

* Calculation not meaningful.

⁽¹⁾ Alliance revenue represents Merck’s share of profits, which are product sales net of cost of sales and commercialization costs (see Note 4 to the consolidated financial statements).

Keytruda is an anti-PD-1 therapy that has been approved for the treatment of multiple malignancies including cervical cancer, classical Hodgkin lymphoma (cHL), esophageal cancer, gastric or gastroesophageal junction adenocarcinoma, HNSCC, hepatocellular carcinoma (HCC), NSCLC, SCLC, melanoma, Merkel cell carcinoma, microsatellite instability-high (MSI-H) or mismatch repair deficient cancer, primary mediastinal large B-cell lymphoma (PMBCL), RCC and urothelial carcinoma. The Keytruda clinical development program includes studies across a broad range of cancer types (see “Research and Development” below).

In January 2020, the FDA approved Keytruda as monotherapy for the treatment of certain patients with Bacillus Calmette-Guerin (BCG)-unresponsive, high-risk, non-muscle invasive bladder cancer (NMIBC) based on the results of the KEYNOTE-057 trial.

In July 2019, the FDA approved Keytruda as monotherapy for the treatment of certain patients with recurrent locally advanced or metastatic squamous cell carcinoma of the esophagus whose tumors express PD-L1 (Combined Positive Score [CPS] ≥10) as determined by an FDA-approved test, based on the results of the KEYNOTE-181 and KEYNOTE-180 trials.

In June 2019, the FDA approved Keytruda as monotherapy or in combination with chemotherapy for the first-line treatment of patients with metastatic or unresectable, recurrent HNSCC based on results from the pivotal Phase 3 KEYNOTE-048 trial. Keytruda was initially approved for HNSCC under the FDA’s accelerated approval process based on data from the Phase 1b KEYNOTE-012 trial. In accordance with the accelerated approval process, continued approval was contingent upon verification and description of clinical benefit, which has now been demonstrated in KEYNOTE-048 and has resulted in the FDA converting the accelerated approval to a full (regular) approval. Keytruda was approved for these indications by the EC in November 2019 and by Japan’s Ministry of Health, Labour and Welfare (MHLW) in December 2019.

Also in June 2019, the FDA approved Keytruda as monotherapy for the treatment of certain patients with metastatic SCLC based on pooled data from the KEYNOTE-158 (cohort G) and KEYNOTE-028 (cohort C1) clinical trials.

In April 2019, the FDA approved Keytruda in combination with Inlyta (axitinib), a tyrosine kinase inhibitor, for the first-line treatment of patients with advanced RCC, the most common type of kidney cancer, based on findings from the pivotal Phase 3 KEYNOTE-426 trial. Keytruda was approved for this indication by the EC in September 2019 and by Japan’s MHLW in December 2019.

Also in April 2019, the FDA approved an expanded label for Keytruda as monotherapy for the first-line treatment of patients with NSCLC expressing PD-L1 (Tumor Proportion Score [TPS] ≥1%) as determined by an FDA-approved test, with no EGFR or ALK genomic tumor aberrations, in stage III disease where patients are not candidates for surgical resection or definitive chemoradiation, and in metastatic disease. The approval was based on results from the Phase 3 KEYNOTE-042 trial.

In September 2019, the FDA approved the combination of Keytruda plus Lenvima for the treatment of certain patients with advanced endometrial carcinoma that is not MSI-H or mismatch repair deficient.

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In March 2019, the EC approved Keytruda in combination with carboplatin and either paclitaxel or nab-paclitaxel for the first-line treatment of adults with metastatic squamous NSCLC based on data from the Phase 3 KEYNOTE-407 trial. Keytruda was approved for this indication by the FDA in October 2018.

In April 2019, the EC approved a new extended dosing schedule of 400 mg every six weeks (Q6W) delivered as an intravenous infusion over 30 minutes for all approved monotherapy indications in the EU. The Q6W dose is available in addition to the formerly approved dose of Keytruda 200 mg every three weeks (Q3W) infused over 30 minutes.

Additionally, in 2019, Keytruda received the following approvals from China’s National Medical Products Administration (NMPA): in combination with pemetrexed and platinum chemotherapy for the first-line treatment of patients with metastatic nonsquamous NSCLC, with no EGFR or ALK genomic tumor aberrations, based on data from the pivotal Phase 3 KEYNOTE-189 trial; as monotherapy for the first-line treatment of patients with locally advanced or metastatic NSCLC whose tumors express PD-L1 as determined by a NMPA-approved test, with no EGFR or ALK genomic tumor aberrations, based on the results from the Phase 3 KEYNOTE-042 trial; and in combination with carboplatin and paclitaxel for the first-line treatment of patients with metastatic squamous NSCLC based on findings from the pivotal Phase 3 KEYNOTE-407 trial.

Global sales of Keytruda grew 55% in 2019 driven by higher demand as the Company continues to launch Keytruda with multiple new indications globally. Sales in the United States continue to build across the multiple approved indications, in particular for the treatment of NSCLC as monotherapy and in combination with chemotherapy for both nonsquamous and squamous metastatic NSCLC, along with uptake in the recently launched RCC and adjuvant melanoma indications. Other indications contributing to U.S. sales growth include HNSCC, urothelial carcinoma, melanoma, and MSI-H cancer. Keytruda sales growth in international markets was driven primarily by performance in Europe, Japan and China reflecting increased use in the treatment of NSCLC, as well as for the more recently approved indications as described above.

The Company is a party to certain third-party license agreements pursuant to which the Company pays royalties on sales of Keytruda. Under the terms of the more significant of these agreements, Merck pays a royalty of 6.5% on worldwide sales of Keytruda through 2023 to one third party; this royalty will decline to 2.5% for 2024 through 2026 and will terminate thereafter. The Company pays an additional 2% royalty on worldwide sales of Keytruda to another third party, the termination date of which varies by country; this royalty will expire in the United States in 2024 and in major European markets in 2025. The royalties are included in Cost of sales.

Pursuant to a re-pricing rule, the Japanese government reduced the price of Keytruda by 17.5% effective February 2020. Additionally, Keytruda will be subject to another significant price reduction in April 2020 under a provision of the Japanese pricing rules.

Lynparza, an oral poly (ADP-ribose) polymerase (PARP) inhibitor being developed as part of a collaboration with AstraZeneca entered into in July 2017 (see Note 4 to the consolidated financial statements), is approved for the treatment of certain types of advanced ovarian, breast and pancreatic cancers. The increase in alliance revenue related to Lynparza in 2019 was driven primarily by expanded use in the United States, the EU, Japan and China reflecting in part the ongoing launch of new indications. Lynparza received approval for the treatment of certain types of advanced ovarian cancer in the United States in December 2018, in the EU and in Japan in June 2019, and in China in December 2019 based on the results of the Phase 3 SOLO-1 trial. Also, in April 2019, the EC approved Lynparza for the treatment of certain adult patients with advanced breast cancer based on the results of the Phase 3 OlympiAD trial. Additionally, in December 2019, the FDA approved Lynparza for the maintenance treatment of certain adult patients with advanced pancreatic cancer based on the results of the Phase 3 POLO trial.

Lenvima, an oral receptor tyrosine kinase inhibitor being developed as part of a collaboration with Eisai entered into in March 2018 (see Note 4 to the consolidated financial statements), is approved for the treatment of certain types of thyroid cancer, HCC, and in combination with evorolimus for certain patients with RCC. Additionally, in September 2019, the FDA approved the combination of Keytruda plus Lenvima for the treatment of certain patients with advanced endometrial carcinoma that is not MSI-H or mismatch repair deficient. This marks the first U.S. approval for the combination of Keytruda plus Lenvima. The increase in alliance revenue related to Lenvima in 2019 reflects strong performance in the treatment of HCC following recent worldwide launches, as well as a full year of collaboration activity in 2019.

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Global sales of Emend, for the prevention of chemotherapy-induced and post-operative nausea and vomiting, declined 26% in 2019 driven primarily by lower demand and pricing in the United States due to competition, including recent generic competition for Emend for Injection following U.S. patent expiry in September 2019. The patent that provided U.S. market exclusivity for Emend expired in 2015 and the patent that provided market exclusivity in most major European markets expired in May 2019. Additionally, Emend for Injection will lose market exclusivity in major European markets in August 2020. The Company anticipates that sales of Emend for Injection in these markets will decline significantly thereafter.

Vaccines

($ in millions)	2019		% Change		% Change Excluding Exchange		2018		% Change		% Change Excluding Exchange		2017
Gardasil/Gardasil 9	$	3,737	19	%	21	%	$	3,151	37	%	36	%	$	2,308
ProQuad	756		27	%	29	%	593		12	%	12	%	528
M-M-R II	549		28	%	29	%	430		13	%	12	%	382
Varivax	970		25	%	28	%	774		1	%	1	%	767
RotaTeq	791		9	%	10	%	728		6	%	6	%	686

Worldwide sales of Gardasil/Gardasil 9, vaccines to help prevent certain cancers and other diseases caused by certain types of HPV, grew 19% in 2019 driven primarily by higher demand in the Asia Pacific region, particularly in China, and higher demand in certain European markets reflecting increased vaccination rates for both boys and girls. Growth was partially offset by lower sales in the United States. The U.S. sales decline was driven by the borrowing of Gardasil 9 doses from the U.S. Centers for Disease and Control Prevention (CDC) Pediatric Vaccine Stockpile, offset in part by higher demand and pricing.

In 2019, the Company borrowed doses of Gardasil 9 from the CDC Pediatric Vaccine Stockpile. The borrowing reduced sales in 2019 by approximately $120 million and the Company recognized a corresponding liability. During 2018, the Company replenished doses borrowed from the CDC Pediatric Vaccine Stockpile in 2017 resulting in the recognition of sales of $125 million in 2018 and a reversal of the liability related to that borrowing.

The decision of Japan’s MHLW to suspend the active recommendation for HPV vaccination is still under review.

The Company is a party to certain third-party license agreements pursuant to which the Company pays royalties on sales of Gardasil/Gardasil 9. Under the terms of the more significant of these agreements, Merck pays a 7% royalty on worldwide sales of Gardasil/Gardasil 9 to one third party (this agreement expires in December 2023) and an additional 7% royalty on sales of Gardasil/Gardasil 9 in the United States to another third party (this agreement expires in December 2028). The royalties are included in Cost of sales.

Global sales of ProQuad, a pediatric combination vaccine to help protect against measles, mumps, rubella and varicella, grew 27% in 2019 driven primarily by higher volumes and pricing in the United States, as well as volume growth in the EU largely reflecting a competitor supply issue.

Worldwide sales of M-M-R II, a vaccine to help protect against measles, mumps and rubella, grew 28% in 2019 driven primarily by higher sales in the United Sates reflecting increased demand due to measles outbreaks, as well as higher pricing. The Company anticipates that U.S. sales of M-M-R II will decline in 2020 driven by lower expected demand related to fewer measles outbreaks.

Global sales of Varivax, a vaccine to help prevent chickenpox (varicella), grew 25% in 2019 driven primarily by government tenders in Latin America, as well as higher pricing and volume growth in the United States. Varivax sales are expected to decline in 2020 due in part to the timing of government tenders and competition in select Latin American markets.

Global sales of RotaTeq, a vaccine to help protect against rotavirus gastroenteritis in infants and children, grew 9% in 2019 driven primarily by continued uptake from the launch in China and higher volumes in the United States, partially offset by lower volumes in Latin America.

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In December 2019, the FDA approved Ervebo for the prevention of disease caused by Zaire ebolavirus in individuals 18 years of age and older. As previously announced, Merck is working to initiate manufacturing of licensed doses and expects these doses to start becoming available in approximately the third quarter of 2020. Merck is working closely with the U.S. government, the World Health Organization (WHO), UNICEF, and Gavi (the Vaccine Alliance) to plan for how eventual, licensed doses will support future public health preparedness and response efforts against Zaire ebolavirus disease. Merck is not seeking to profit from sales of this vaccine; rather, to ensure the vaccine is sustainable by recovering manufacturing and operational costs associated with the program. Ervebo was also granted a conditional marking authorization by the EC. Additionally, Merck has made submissions to African country national regulatory authorities in collaboration with the African Vaccine Regulatory Forum that will allow the vaccine to be registered in African countries considered to be at-risk for Ebola outbreaks by the WHO. In February 2020, Merck confirmed that four African countries have approved Ervebo. Approvals in additional countries in Africa are anticipated in the near future.

Hospital Acute Care

($ in millions)	2019		% Change		% Change Excluding Exchange		2018		% Change		% Change Excluding Exchange		2017
Bridion	$	1,131	23	%	26	%	$	917	30	%	30	%	$	704
Noxafil	662		(11	)%	(7	)%	742		17	%	15	%	636
Invanz	263		(47	)%	(44	)%	496		(18	)%	(17	)%	602
Cubicin	257		(30	)%	(28	)%	367		(4	)%	(5	)%	382

Global sales of Bridion, for the reversal of two types of neuromuscular blocking agents used during surgery, grew 23% in 2019 driven by higher demand globally, particularly in the United States.

Worldwide sales of Noxafil, for the prevention of invasive fungal infections, declined 11% in 2019 driven primarily by generic competition in the United States. The patent that provided U.S. market exclusivity for certain forms of Noxafil representing the majority of U.S. Noxafil sales expired in July 2019. Accordingly, the Company is experiencing a decline in U.S. Noxafil sales as a result of generic competition and expects the decline to continue. Additionally, the patent for Noxafil expired in a number of major European markets in December 2019. As a result, the Company anticipates sales of Noxafil in these markets will decline significantly in future periods.

Global sales of Invanz, for the treatment of certain infections, declined 47% in 2019 driven by generic competition in the United States. The patent that provided U.S. market exclusivity for Invanz expired in November 2017 and generic competition began in the second half of 2018. The Company subsequently experienced a significant decline in Invanz sales in the United States as a result of this generic competition and has since lost most of its U.S. Invanz sales.

Global sales of Cubicin, an I.V. antibiotic for complicated skin and skin structure infections or bacteremia when caused by designated susceptible organisms, declined 30% in 2019 resulting primarily from ongoing generic competition in the United States following expiration of the U.S. composition patent for Cubicin in 2016.

In 2019, the FDA and EC approved expanded indications for Zerbaxa for the treatment of HABP/VABP caused by certain susceptible Gram-negative microorganisms based on the results of the pivotal Phase 3 ASPECT-NP trial. Zerbaxa was previously approved in the United States and EU for the treatment of adults with certain complicated urinary tract and intra-abdominal infections.

In July 2019, the FDA approved Recarbrio for injection, a new combination antibacterial for the treatment of adults who have limited or no alternative treatment options with complicated urinary tract infections and complicated intra-abdominal infections caused by certain susceptible Gram-negative microorganisms. Recarbrio was approved by the EC in February 2020. Merck anticipates making Recarbrio available in the first half of 2020.

In January 2020, the FDA approved Dificid (fidaxomicin) for oral suspension and Dificid tablets for the treatment of Clostridioides (formerly Clostridium) difficile-associated diarrhea in children aged six months and older.

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Immunology

($ in millions)	2019		% Change		% Change Excluding Exchange		2018		% Change		% Change Excluding Exchange		2017
Simponi	$	830	(7	)%	(2	)%	$	893	9	%	5	%	$	819
Remicade	411		(29	)%	(25	)%	582		(31	)%	(33	)%	837

Sales of Simponi, a once-monthly subcutaneous treatment for certain inflammatory diseases (marketed by the Company in Europe, Russia and Turkey), declined 7% in 2019 driven by the unfavorable effect of foreign exchange and lower pricing in Europe. Sales of Simponi are being unfavorably affected by the launch of biosimilars for a competing product. The Company expects this competition will continue to unfavorably affect sales of Simponi.

Sales of Remicade, a treatment for inflammatory diseases (marketed by the Company in Europe, Russia and Turkey), declined 29% in 2019 driven by ongoing biosimilar competition in the Company’s marketing territories. 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.

Virology

($ in millions)	2019		% Change		% Change Excluding Exchange		2018		% Change		% Change Excluding Exchange		2017
Isentress/Isentress HD	$	975	(15	)%	(10	)%	$	1,140	(5	)%	(5	)%	$	1,204

Worldwide sales of Isentress/Isentress HD, an HIV integrase inhibitor for use in combination with other antiretroviral agents for the treatment of HIV-1 infection, declined 15% in 2019 primarily reflecting lower demand in the United States and in the EU due to competitive pressure.

In September 2019, the FDA approved supplemental New Drug Applications (NDA) for Pifeltro (doravirine) in combination with other antiretroviral agents, and for Delstrigo (doravirine/lamivudine/tenofovir disoproxil fumarate) as a complete regimen, that expand their indications to include adult patients with HIV-1 infection who are virologically suppressed on a stable antiretroviral regimen.

Cardiovascular

($ in millions)	2019		% Change		% Change Excluding Exchange		2018		% Change		% Change Excluding Exchange		2017
Zetia/Vytorin	$	874	(35	)%	(34	)%	$	1,355	(35	)%	(38	)%	$	2,095
Atozet	391		13	%	18	%	347		54	%	48	%	225
Rosuzet	120		107	%	115	%	58		12	%	9	%	52
Adempas	419		27	%	30	%	329		10	%	7	%	300

Combined global sales of Zetia (marketed in most countries outside the United States as Ezetrol) and Vytorin (marketed outside the United States as Inegy), medicines for lowering LDL cholesterol, declined 35% in 2019 driven primarily by lower sales in the EU. The EU patents for Ezetrol and Inegy expired in April 2018 and April 2019, respectively. Accordingly, the Company is experiencing sales declines in these markets as a result of generic competition and expects the declines to continue. The sales decline was also attributable to loss of exclusivity in Australia. Merck lost market exclusivity in the United States for Zetia in 2016 and Vytorin in 2017 and subsequently lost nearly all U.S. sales of these products as a result of generic competition.

Sales of Atozet (marketed outside of the United States), a medicine for lowering LDL cholesterol, grew 13% in 2019, primarily driven by higher demand in the EU and in Korea.

Sales of Rosuzet (marketed outside of the United States), a medicine for lowering LDL cholesterol, more than doubled in 2019, primarily driven by the launch in Japan, as well as higher demand in Korea.

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Adempas, a cardiovascular drug for the treatment of pulmonary arterial hypertension, is part of a worldwide clinical development collaboration with Bayer AG (Bayer) to market and develop soluble guanylate cyclase (sGC) modulators including Adempas (see Note 4 to the consolidated financial statements). The increase in alliance revenue of 27% in 2019 was driven both by higher profits from Bayer and higher sales of Adempas in Merck’s marketing territories.

Diabetes

($ in millions)	2019		% Change		% Change Excluding Exchange		2018		% Change		% Change Excluding Exchange		2017
Januvia/Janumet	$	5,524	(7	)%	(4	)%	$	5,914	—	%	(1	)%	$	5,896

Worldwide combined sales of Januvia and Janumet, medicines that help lower blood sugar levels in adults with type 2 diabetes, declined 7% in 2019 as a result of continued pricing pressure in the United States, partially offset by higher demand in most international markets. The Company expects U.S. pricing pressure to continue. The patents that provide market exclusivity for Januvia and Janumet in the United States expire in July 2022 (although six-month pediatric exclusivity may extend this date). The patent that provides market exclusivity for Januvia in the EU expires in July 2022 (although pediatric exclusivity may extend this date to September 2022). The supplementary patent certificate that provides market exclusivity for Janumet in the EU expires in April 2023. The Company anticipates sales of Januvia and Janumet in these markets will decline substantially after these patent expiries.

Women’s Health 

($ in millions)	2019		% Change		% Change Excluding Exchange		2018		% Change		% Change Excluding Exchange		2017
NuvaRing	$	879	(3	)%	(2	)%	$	902	19	%	18	%	$	761
Implanon/Nexplanon	787		12	%	14	%	703		2	%	3	%	686

Worldwide sales of NuvaRing, a vaginal contraceptive product, declined 3% in 2019 driven primarily by lower demand in the EU due to generic competition, largely offset by higher sales in the United States reflecting higher pricing that was partially offset by lower demand. The patent that provided U.S. market exclusivity for NuvaRing expired in April 2018 and generic competition began in December 2019. The Company anticipates a rapid and substantial decline in U.S. NuvaRing sales in 2020 as a result of this generic competition.

Worldwide sales of Implanon/Nexplanon, a single-rod subdermal contraceptive implant, grew 12% in 2019, primarily driven by higher demand and pricing in the United States.

Biosimilars

($ in millions)	2019		% Change	% Change Excluding Exchange	2018		% Change	% Change Excluding Exchange	2017
Biosimilars	$	252	*	*	$	64	*	*	$	5

* Calculation not meaningful.

Biosimilar products are marketed by the Company pursuant to an agreement with Samsung Bioepis Co., Ltd. (Samsung) to develop and commercialize multiple pre-specified biosimilar candidates. Currently, the Company markets Renflexis (infliximab-abda), a tumor necrosis factor (TNF) antagonist biosimilar to Remicade (infliximab) for the treatment of certain inflammatory diseases; Ontruzant (trastuzumab-dttb), a human epidermal growth factor receptor 2 (HER2)/ neu receptor antagonist biosimilar to Herceptin (trastuzumab) for the treatment of HER2-positive breast cancer and HER2 overexpressing gastric cancer; and Brenzys (etanercept biosimilar), a TNF antagonist biosimilar to Enbrel for the treatment of certain inflammatory diseases. Merck’s commercialization territories under the agreement vary by product. Sale growth of biosimilars in 2019 was driven by continued uptake of Renflexis in United States since launch in 2017, continued uptake of Ontruzant in the EU since launch in 2018, and the launch of Brenzys in Brazil in 2019.

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Animal Health Segment

($ in millions)	2019		% Change		% Change Excluding Exchange		2018		% Change		% Change Excluding Exchange		2017
Livestock	$	2,784	6	%	11	%	$	2,630	6	%	7	%	$	2,484
Companion Animal	1,609		2	%	5	%	1,582		14	%	13	%	1,391

Sales of livestock products grew 6% in 2019 predominantly due to products obtained in the April 2019 acquisition of Antelliq, a leader in digital animal identification, traceability and monitoring solutions (see Note 3 to the consolidated financial statements). Growth in sales of livestock products was also driven by higher demand for aqua and swine products. Sales of companion animal products grew 2% in 2019 driven primarily by higher demand for the Bravecto line of products for parasitic control.

Costs, Expenses and Other

($ in millions)	2019		Change		2018			Change		2017
Cost of sales	$	14,112	4	%	$	13,509		5	%	$	12,912
Selling, general and administrative	10,615		5	%	10,102			—	%	10,074
Research and development	9,872		1	%	9,752			-6	%	10,339
Restructuring costs	638		1	%	632			-19	%	776
Other (income) expense, net	139		*		(402		)	-20	%	(500		)
	$	35,376	5	%	$	33,593		—	%	$	33,601

* Greater than 100%.

Cost of Sales

Cost of sales was $14.1 billion in 2019 compared with $13.5 billion in 2018. Cost of sales includes the amortization of intangible assets recorded in connection with business acquisitions, which totaled $1.4 billion in 2019 compared with $2.7 billion in 2018. Cost of sales also includes the amortization of amounts capitalized in connection with collaborations of $464 million in 2019 compared with $347 million in 2018 (see Note 8 to the consolidated financial statements). Additionally, costs in 2019 include intangible asset impairment charges of $705 million related to marketed products recorded in connection with business acquisitions (see Note 8 to the 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. Costs in 2018 include a $423 million charge related to the termination of a collaboration agreement with Samsung for insulin glargine (see Note 3 to the consolidated financial statements). Also included in cost of sales are expenses associated with restructuring activities which amounted to $251 million in 2019 compared with $21 million in 2018, primarily reflecting 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 69.9% in 2019 compared with 68.1% in 2018. The gross margin improvement in 2019 reflects the charge recorded in 2018 in connection with the termination of the collaboration agreement with Samsung (noted above), favorable product mix, and lower amortization of intangible assets (noted above). These improvements in gross margin were partially offset by unfavorable manufacturing variances, inventory write-offs, pricing pressure, and higher restructuring costs.

Selling, General and Administrative

Selling, general and administrative (SG&A) expenses were $10.6 billion in 2019, an increase of 5% compared with 2018, driven primarily by higher administrative costs, acquisition and divestiture-related costs (largely related to the acquisition of Antelliq), promotional expenses primarily in support of strategic brands, and restructuring costs, partially offset by the favorable effect of foreign exchange and lower selling costs. SG&A expenses in 2019 include restructuring costs of $34 million related primarily to accelerated depreciation for facilities to be closed or divested. Separation costs associated with sales force reductions have been incurred and are reflected in Restructuring costs as discussed below. SG&A expenses include acquisition and divestiture-related costs of $126 million in 2019 compared

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with $32 million in 2018, consisting of integration, transaction, and certain other costs related to business acquisitions and divestitures.

Research and Development

Research and development (R&D) expenses were $9.9 billion in 2019, an increase of 1% compared with 2018. The increase was driven primarily by a $993 million charge in 2019 for the acquisition of Peloton (see Note 3 to the consolidated financial statements), as well as higher expenses related to clinical development and increased investment in discovery research and early drug development. The increase in R&D expenses in 2019 was partially offset by a $1.4 billion charge in 2018 related to the formation of an oncology collaboration with Eisai (see Note 4 to the consolidated financial statements), a $344 million charge in 2018 related to the acquisition of Viralytics Limited (Viralytics) (see Note 3 to the consolidated financial statements), and the favorable effect of foreign exchange.

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 $6.1 billion in 2019 compared with $5.6 billion in 2018. Also included in R&D expenses are Animal Health research costs, licensing costs and costs incurred by other divisions in support of R&D activities, including depreciation, production and general and administrative, which in the aggregate were $2.6 billion in 2019 and $2.3 billion in 2018. R&D expenses also include in-process research and development (IPR&D) impairment charges of $172 million and $152 million in 2019 and 2018, respectively (see Note 8 to the 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. In addition, R&D expenses include expense or income related to changes in the estimated fair value measurement of liabilities for contingent consideration recorded in connection with business acquisitions. During 2019 and 2018, the Company recorded a net reduction in expenses of $39 million and $54 million, respectively, related to changes in these estimates.

Restructuring Costs

In early 2019, Merck approved a new global restructuring program (Restructuring Program) as part of a worldwide initiative focused on further optimizing the Company’s manufacturing and supply network, as well as reducing its global real estate footprint. This program is a continuation of the Company’s plant rationalization, builds on prior restructuring programs and does not include any actions associated with the planned spin-off of NewCo. As the Company continues to evaluate its global footprint and overall operating model, it has subsequently identified additional actions under the Restructuring Program, and could identify further actions over time. The actions currently contemplated under the Restructuring Program are expected to be substantially completed by the end of 2023, with the cumulative pretax costs to be incurred by the Company to implement the program now estimated to be approximately $2.5 billion. The Company expects to record charges of approximately $800 million in 2020 related to the Restructuring Program. The Company anticipates the actions under the Restructuring Program to result in annual net cost savings of approximately $900 million by the end of 2023. Actions under previous global restructuring programs have been substantially completed.

Restructuring costs, primarily representing separation and other related costs associated with these restructuring activities, were $638 million in 2019 and $632 million in 2018. Separation costs incurred were 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. Also included in restructuring costs are asset abandonment, facility 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 Cost of sales, Selling, general and administrative and Research and development. The Company recorded aggregate pretax costs of $927 million in 2019 and $658 million in 2018 related to restructuring program activities (see Note 5 to the consolidated financial statements).

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Other (Income) Expense, Net

For details on the components of Other (income) expense, net, see Note 14 to the consolidated financial statements.

Segment Profits
($ in millions)	2019			2018			2017
Pharmaceutical segment profits	$	28,324		$	24,871		$	23,018
Animal Health segment profits	1,609			1,659			1,552
Other non-reportable segment profits	(7		)	103			275
Other	(18,462		)	(17,932		)	(18,324		)
Income Before Taxes	$	11,464		$	8,701		$	6,521

Pharmaceutical segment profits are comprised of segment sales less standard costs, as well as SG&A expenses directly incurred by the segment. Animal Health segment profits are comprised of segment sales, less all cost of sales, as well as SG&A and R&D expenses directly incurred by the segment. For internal management reporting presented to the chief operating decision maker, Merck does not allocate the remaining cost of sales not included in segment profits as described above, research and development expenses incurred by MRL, 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 costs related to restructuring activities and acquisition and divestiture-related costs, including amortization of purchase accounting adjustments, intangible asset impairment charges and changes in the estimated fair value measurement of liabilities for contingent consideration. 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. During 2019, as a result of changes to the Company’s internal reporting structure, certain costs that were previously included in the Pharmaceutical segment are now being included as part of non-segment expenses within MRL. Prior period Pharmaceutical segment profits have been recast to reflect these changes on a comparable basis.

Pharmaceutical segment profits grew 14% in 2019 compared with 2018 driven primarily by higher sales, as well as lower selling costs. Animal Health segment profits declined 3% in 2019 driven primarily by unfavorable product mix, higher investments in selling and product development, and the unfavorable effect of foreign exchange, partially offset by higher sales.

Taxes on Income

The effective income tax rates of 14.7% in 2019 and 28.8% in 2018 reflect the impacts of acquisition and divestiture-related costs, restructuring costs and the beneficial impact of foreign earnings, including product mix. The effective income tax rate in 2019 also reflects the favorable impact of a $364 million net tax benefit related to the settlement of certain federal income tax matters (see Note 15 to the consolidated financial statements) and the reversal of tax reserves established in connection with the 2014 divestiture of Merck’s Consumer Care (MCC) business due to the lapse in the statute of limitations. In addition, the effective income tax rate in 2019 reflects the unfavorable impacts of a charge for the acquisition of Peloton for which no tax benefit was recognized and charges of $117 million related to the finalization of treasury regulations for the transition tax associated with the 2017 enactment of U.S. tax legislation known as the Tax Cuts and Jobs Act (TCJA) (see Note 15 to the consolidated financial statements). The effective income tax rate in 2018 includes measurement-period adjustments to the provisional amounts recorded in 2017 associated with the enactment of the TCJA, including $124 million related to the transition tax. In addition, the effective income tax rate for 2018 reflects the unfavorable impacts of a charge recorded in connection with the formation of a collaboration with Eisai and a charge related to the termination of a collaboration agreement with Samsung for which no tax benefit was recognized.

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Net (Loss) Income Attributable to Noncontrolling Interests

Net (loss) income attributable to noncontrolling interests was $(66) million in 2019 compared with $(27) million in 2018. The losses in 2019 and 2018 were driven primarily by the portion of goodwill impairment charges related to certain business in the Healthcare Services segment that are attributable to noncontrolling interests.

Net Income and Earnings per Common Share

Net income attributable to Merck & Co., Inc. was $9.8 billion in 2019 and $6.2 billion in 2018. EPS was $3.81 in 2019 and $2.32 in 2018.

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. In addition, senior management’s annual compensation is derived in part using non-GAAP pretax income. 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).

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

($ in millions except per share amounts)	2019			2018			2017
Income before taxes as reported under GAAP	$	11,464		$	8,701		$	6,521
Increase (decrease) for excluded items:
Acquisition and divestiture-related costs	2,681			3,066			3,760
Restructuring costs	927			658			927
Other items:
Charge for the acquisition of Peloton	993			—			—
Charge related to the formation of an oncology collaboration with Eisai	—			1,400			—
Charge related to the termination of a collaboration with Samsung	—			423			—
Charge for the acquisition of Viralytics	—			344			—
Charge related to the formation of an oncology collaboration with AstraZeneca	—			—			2,350
Other	55			(57		)	(16		)
Non-GAAP income before taxes	16,120			14,535			13,542
Taxes on income as reported under GAAP	1,687			2,508			4,103
Estimated tax benefit on excluded items (1)	695			535			785
Net tax charge related to the enactment of the TCJA and subsequent finalization of related treasury regulations (2)	(117		)	(160		)	(2,625		)
Net tax benefit from the settlement of certain federal income tax matters	364			—			234
Tax benefit from the reversal of tax reserves related to the divestiture of MCC	86			—			—
Tax benefit related to the settlement of a state income tax matter	—			—			88
Non-GAAP taxes on income	2,715			2,883			2,585
Non-GAAP net income	13,405			11,652			10,957
Less: Net (loss) income attributable to noncontrolling interests as reported under GAAP	(66		)	(27		)	24
Acquisition and divestiture-related costs attributable to noncontrolling interests	(89		)	(58		)	—
Non-GAAP net income attributable to noncontrolling interests	23			31			24
Non-GAAP net income attributable to Merck & Co., Inc.	$	13,382		$	11,621		$	10,933
EPS assuming dilution as reported under GAAP	$	3.81		$	2.32		$	0.87
EPS difference	1.38			2.02			3.11
Non-GAAP EPS assuming dilution	$	5.19		$	4.34		$	3.98

⁽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⁾ Amount in 2017 was provisional (see Note 15 to the consolidated financial statements).

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 liabilities for contingent consideration. Also excluded are integration, transaction, and certain other costs associated with business acquisitions and divestitures.

Restructuring Costs

Non-GAAP income and non-GAAP EPS exclude costs related to restructuring actions (see Note 5 to the 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

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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, facility 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

These items are adjusted for after they are evaluated on an individual basis considering their quantitative and qualitative aspects. Typically, these consist of items that are unusual in nature, significant to the results of a particular period or not indicative of future operating results. Excluded from non-GAAP income and non-GAAP EPS in 2019 is a charge for the acquisition of Peloton (see Note 3 to the consolidated financial statements), tax charges related to the finalization of U.S. treasury regulations related to the TCJA, a net tax benefit related to the settlement of certain federal income tax matters, and a tax benefit related to the reversal of tax reserves established in connection with the 2014 divestiture of MCC (see Note 15 to the consolidated financial statements). Excluded from non-GAAP income and non-GAAP EPS in 2018 is a charge related to the formation of a collaboration with Eisai (see Note 4 to the consolidated financial statements), a charge related to the termination of a collaboration agreement with Samsung for insulin glargine (see Note 3 to the consolidated financial statements), a charge for the acquisition of Viralytics (see Note 3 to the consolidated financial statements), and measurement-period adjustments related to the provisional amounts recorded for the TCJA (see Note 15 to the consolidated financial statements). Excluded from non-GAAP income and non-GAAP EPS in 2017 is a charge related to the formation of a collaboration with AstraZeneca (see Note 4 to the consolidated financial statements), as well as a provisional net tax charge related to the enactment of the TCJA, a net tax benefit related to the settlement of certain federal income tax matters and a tax benefit related to the settlement of a state income tax matter (see Note 15 to the consolidated financial statements).

Research and Development

A chart reflecting the Company’s current research pipeline as of February 21, 2020 is set forth in Item 1. “Business — Research and Development” above.

Research and Development Update

The Company currently has several candidates under regulatory review in the United States and internationally.

Keytruda is an anti-PD-1 therapy approved for the treatment of many cancers that is in clinical development for expanded indications. These approvals were the result of a broad clinical development program that currently consists of more than 1,000 clinical trials, including more than 600 trials that combine Keytruda with other cancer treatments. These studies encompass more than 30 cancer types including: biliary tract, cervical, colorectal, cutaneous squamous cell, endometrial, gastric, head and neck, hepatocellular, Hodgkin lymphoma, non-Hodgkin lymphoma, melanoma, mesothelioma, nasopharyngeal, non-small-cell lung, ovarian, PMBCL, prostate, renal, small-cell lung, triple-negative breast and urothelial, many of which are currently in Phase 3 clinical development. Further trials are being planned for other cancers.

Keytruda is under review in the EU as monotherapy for the first-line treatment of patients with stage III NSCLC who are not candidates for surgical resection or definitive chemoradiation, or metastatic NSCLC, and whose tumors express PD-L1 (TPS ≥1%) with no EGFR or ALK genomic tumor aberrations based on results from the Phase 3 KEYNOTE-042 trial.

Keytruda is under review in Japan as monotherapy and in combination with chemotherapy for the first-line treatment of advanced gastric or gastroesophageal junction adenocarcinoma based on results from the pivotal Phase 3 KEYNOTE-062 trial.

Keytruda is also under review in Japan as monotherapy for the second-line treatment of advanced or metastatic esophageal or esophagogastric junction carcinoma based on the results of the Phase 3 KEYNOTE-181 trial. Merck has made the decision to withdraw its Type II variation application for Keytruda for this indication in the EU.

In October 2019, the FDA accepted a supplemental Biologics License Application (BLA) seeking use of Keytruda for the treatment of patients with recurrent and/or metastatic cutaneous squamous cell carcinoma (cSCC) that

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is not curable by surgery or radiation based on the results of the KEYNOTE-629 trial. The FDA set a Prescription Drug User Fee Act (PDUFA) date of June 29, 2020.

In February 2020, Merck announced the FDA issued a Complete Response Letter regarding Merck’s supplemental BLAs seeking to update the dosing frequency for Keytruda to include a 400 mg dose infused over 30 minutes every-six-weeks (Q6W) option in multiple indications. The submitted applications are based on pharmacokinetic modeling and simulation data presented at the 2018 American Society of Clinical Oncology (ASCO) Annual Meeting. These data supported the EC approval of 400 mg Q6W dosing for Keytruda monotherapy indications in March 2019. Merck is reviewing the letter and will discuss next steps with the FDA.

Additionally, Keytruda has received Breakthrough Therapy designation from the FDA in combination with neoadjuvant chemotherapy for the treatment of high-risk, early-stage triple-negative breast cancer (TNBC) and in combination with enfortumab vedotin, in the first-line setting for the treatment of patients with unresectable locally advanced or metastatic urothelial cancer who are not eligible for cisplatin-containing chemotherapy. 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.

In September 2019, Merck announced results from the pivotal neoadjuvant/adjuvant Phase 3 KEYNOTE-522 trial in patients with early-stage TNBC. The trial investigated a regimen of neoadjuvant Keytruda plus chemotherapy, followed by adjuvant Keytruda as monotherapy (the Keytruda regimen) compared with a regimen of neoadjuvant chemotherapy followed by adjuvant placebo (the chemotherapy-placebo regimen). Interim findings were presented at the European Society for Medical Oncology (ESMO) 2019 Congress. In the neoadjuvant phase, Keytruda plus chemotherapy resulted in a statistically significant increase in pathological complete response (pCR) versus chemotherapy in patients with early-stage TNBC. The improvement seen when adding Keytruda to neoadjuvant chemotherapy was observed regardless of PD-L1 expression. In the other dual primary endpoint of event-free-survival (EFS), with a median follow-up of 15.5 months, the Keytruda regimen reduced the risk of progression in the neoadjuvant phase and recurrence in the adjuvant phase compared with the chemotherapy-placebo regimen. Merck continues to discuss interim analysis data from KEYNOTE-522 with regulatory authorities. The Keytruda breast cancer clinical development program encompasses several internal and external collaborative studies.

In February 2020, Merck announced that the pivotal Phase 3 KEYNOTE-355 trial investigating Keytruda in combination with chemotherapy met one of its dual primary endpoints of progression-free survival (PFS) in patients with metastatic triple-negative breast cancer (mTNBC) whose tumors expressed PD-L1 (CPS ≥10). Based on an interim analysis conducted by an independent Data Monitoring Committee (DMC), first-line treatment with Keytruda in combination with chemotherapy (nab-paclitaxel, paclitaxel or gemcitabine/carboplatin) demonstrated a statistically significant and clinically meaningful improvement in PFS compared to chemotherapy alone in these patients. Based on the recommendation of the DMC, the trial will continue without changes to evaluate the other dual primary endpoint of overall survival (OS).

In May 2019, Merck announced that the Phase 3 KEYNOTE-119 trial evaluating Keytruda as monotherapy for the second- or third-line treatment of patients with metastatic TNBC did not meet its pre-specified primary endpoint of superior OS compared to chemotherapy. Other endpoints were not formally tested per the study protocol because the primary endpoint of OS was not met.

In June 2019, Merck announced full results from the pivotal Phase 3 KEYNOTE-062 trial evaluating Keytruda as monotherapy and in combination with chemotherapy for the first-line treatment of advanced gastric or gastroesophageal junction adenocarcinoma. In the monotherapy arm of the study, Keytruda met a primary endpoint by demonstrating noninferiority to chemotherapy, the current standard of care, for OS in patients whose tumors expressed PD-L1 (CPS ≥1). In the combination arm of KEYNOTE-062, Keytruda plus chemotherapy was not found to be statistically superior for OS (CPS ≥1 or CPS ≥10) or PFS (CPS ≥1) compared with chemotherapy alone. Results were presented at the 2019 ASCO Annual Meeting. In September 2017, the FDA approved Keytruda as a third-line treatment for previously treated patients with recurrent locally advanced or metastatic gastric or gastroesophageal junction cancer whose tumors express PD-L1 (CPS ≥1) as determined by an FDA-approved test. KEYNOTE-062 was a potential confirmatory trial for this accelerated, third-line approval. In addition to KEYNOTE-062, additional first-line, Phase

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3 studies in Merck’s gastric clinical program include KEYNOTE-811 and KEYNOTE-859, as well as KEYNOTE-585 in the neoadjuvant and adjuvant treatment setting.

In January 2020, Merck announced that the Phase 3 KEYNOTE-604 trial investigating Keytruda in combination with chemotherapy met one of its dual primary endpoints of PFS in the first-line treatment of patients with extensive stage SCLC. At the final analysis of the study, there was also an improvement in OS for patients treated with Keytruda in combination with chemotherapy compared to chemotherapy alone; however, these OS results did not meet statistical significance per the pre-specified statistical plan. Results will be presented at an upcoming medical meeting and discussed with regulatory authorities.

Lynparza is an oral PARP inhibitor currently approved for certain types of advanced ovarian, breast and pancreatic cancers being co-developed for multiple cancer types as part of a collaboration with AstraZeneca (see Note 4 to the consolidated financial statements).

Lynparza is under review in the EU as a first-line maintenance monotherapy for patients with gBRCAm metastatic pancreatic cancer whose disease has not progressed following first-line platinum-based chemotherapy. Lynparza was approved for this indication by the FDA in December 2019 based on results from the Phase 3 POLO trial. A decision from the European Medicines Agency (EMA) is expected in the second half of 2020.

In January 2020, the FDA accepted a supplemental NDA for Lynparza in combination with bevacizumab for the maintenance treatment of women with advanced ovarian cancer whose disease showed a complete or partial response to first-line treatment with platinum-based chemotherapy and bevacizumab based on the results from the pivotal Phase 3 PAOLA-1 trial. A PDUFA date is set for the second quarter of 2020. This indication is also under review in the EU.

In January 2020, the FDA accepted for Priority Review a supplemental NDA for Lynparza for the treatment of patients with metastatic castration-resistant prostate cancer (mCRPC) and deleterious or suspected deleterious germline or somatic homologous recombination repair (HRR) gene mutations, who have progressed following prior treatment with a new hormonal agent based on positive results from the Phase 3 PROfound trial. A PDUFA date is set for the second quarter of 2020. This indication is also under review in the EU.

In June 2019, Merck and AstraZeneca presented full results from the Phase 3 SOLO-3 trial which evaluated Lynparza, compared to chemotherapy, for the treatment of platinum-sensitive relapsed patients with gBRCAm advanced ovarian cancer, who have received two or more prior lines of chemotherapy. The results from the trial showed a statistically-significant and clinically-meaningful improvement in objective response rate (ORR) in the Lynparza arm compared to the chemotherapy arm. The key secondary endpoint of PFS was also significantly increased in the Lynparza arm compared to the chemotherapy arm. The results were presented at the 2019 ASCO Annual Meeting.

MK-5618, selumetinib, is a MEK 1/2 inhibitor being co-developed as part of a strategic collaboration with AstraZeneca (see Note 4 to the consolidated financial statements). Selumetinib is under Priority Review with the FDA as a potential new medicine for pediatric patients aged three years and older with neurofibromatosis type 1 (NF1) and symptomatic, inoperable plexiform neurofibromas. This regulatory submission was based on positive results from the National Cancer Institute Cancer Therapy Evaluation Program-sponsored SPRINT Phase 2 Stratum 1 trial. A PDUFA date is set for the second quarter of 2020.

V503 is under review in Japan for an initial indication in females for the prevention of certain HPV-related diseases and precursors.

In February 2020, the FDA accepted for Priority Review a supplemental BLA for Gardasil 9 for the prevention of certain head and neck cancers caused by vaccine-type HPV in females and males 9 through 45 years of age. The FDA set a PDUFA date of June 2020.

In addition to the candidates under regulatory review, the Company has several drug candidates in Phase 3 clinical development in addition to the Keytruda programs discussed above.

Lynparza, in addition to the indications under review discussed above, is in Phase 3 development in combination with Keytruda for the treatment of NSCLC.

Lenvima is an orally available tyrosine kinase inhibitor currently approved for certain types of thyroid cancer, HCC, and in combination for certain patients with RCC being co-developed as part of a strategic collaboration with Eisai (see Note 4 to the consolidated financial statements). Pursuant to the agreement, the companies will jointly

55

initiate clinical studies evaluating the Keytruda/Lenvima combination in six types of cancer (endometrial cancer, NSCLC, HCC, HNSCC, bladder cancer and melanoma), as well as a basket trial targeting multiple cancer types. The FDA granted Breakthrough Therapy designation for Keytruda in combination with Lenvima both for the potential treatment of patients with advanced and/or metastatic RCC and for the potential treatment of patients with unresectable HCC not amenable to locoregional treatment.

MK-7264, gefapixant, is a selective, non-narcotic, orally-administered P2X3-receptor antagonist being investigated in Phase 3 trials for the treatment of refractory, chronic cough and in a Phase 2 trial for the treatment of women with endometriosis-related pain.

MK-1242, vericiguat, is a sGC stimulator for the potential treatment of patients with worsening chronic heart failure being developed as part of a worldwide strategic collaboration between Merck and Bayer (see Note 4 to the consolidated financial statements). Vericiguat is being studied in patients suffering from chronic heart failure with reduced ejection fraction (Phase 3 clinical trial) and from chronic heart failure with preserved ejection fraction (Phase 2 clinical trial). In November 2019, Merck announced that the Phase 3 VICTORIA study evaluating the efficacy and safety of vericiguat met the primary efficacy endpoint. Vericiguat reduced the risk of the composite endpoint of heart failure hospitalization or cardiovascular death in patients with worsening chronic heart failure with reduced ejection fraction compared to placebo when given in combination with available heart failure therapies. The results of the VICTORIA study will be presented at an upcoming medical meeting in 2020.

V114 is an investigational polyvalent conjugate vaccine for the prevention of pneumococcal disease. In June 2018, Merck initiated the first Phase 3 study in the adult population for the prevention of invasive pneumococcal disease. Currently six Phase 3 adult studies are ongoing, including studies in healthy adults 50 years of age or older, adults with risk factors for pneumococcal disease, those infected with HIV, and those who are recipients of allogeneic hematopoietic stem cell transplant. In October 2018, Merck began the first Phase 3 study in the pediatric population. Currently, eight studies are ongoing, including studies in healthy infants and in children afflicted with sickle cell disease. V114 has received Breakthrough Therapy designation from the FDA for the prevention of invasive pneumococcal disease caused by the vaccine serotypes in pediatric patients (6 weeks to 18 years of age) and in adults.

The Company maintains a number of long-term exploratory and fundamental research programs in biology and chemistry as well as research programs directed toward product development. The Company’s research and development model is designed to increase productivity and improve the probability of success by prioritizing the Company’s research and development resources on candidates the Company believes are capable of providing unambiguous, promotable advantages to patients and payers and delivering the maximum value of its approved medicines and vaccines through new indications and new formulations. Merck is pursuing emerging product opportunities independent of therapeutic area or modality (small molecule, biologics and vaccines) and is building its biologics capabilities. The Company is committed to ensuring that externally sourced programs remain an important component of its pipeline strategy, with a focus on supplementing its internal research with a licensing and external alliance strategy focused on the entire spectrum of collaborations from early research to late-stage compounds, as well as access to new technologies.

The Company’s clinical pipeline includes candidates in multiple disease areas, including cancer, cardiovascular diseases, diabetes and other metabolic diseases, infectious diseases, neurosciences, pain, respiratory diseases, and vaccines.

Acquired In-Process Research and Development

In connection with business acquisitions, the Company has recorded the fair value of in-process research projects which, at the time of acquisition, had not yet reached technological feasibility. At December 31, 2019, the balance of IPR&D was $1.0 billion.

The IPR&D projects that remain in development are subject to the inherent risks and uncertainties in drug development and it is possible that the Company will not be able to successfully develop and complete the IPR&D programs and profitably commercialize the underlying product candidates. The time periods to receive approvals from the FDA and other regulatory agencies are subject to uncertainty. Significant delays in the approval process, or the Company’s failure to obtain approval at all, would delay or prevent the Company from realizing revenues from these products. Additionally, if certain of the IPR&D programs fail or are abandoned during development, then the Company will not realize the future cash flows it has estimated and recorded as IPR&D as of the acquisition date. If such

56

circumstances were to occur, the Company’s future operating results could be adversely affected and the Company may recognize impairment charges and such charges could be material.

In 2019, 2018, and 2017 the Company recorded IPR&D impairment charges within Research and development expenses of $172 million, $152 million and $483 million, respectively (see Note 8 to the consolidated financial statements).

Additional research and development will be required before any of the remaining programs reach technological feasibility. The costs to complete the research projects will depend on whether the projects are brought to their final stages of development and are ultimately submitted to the FDA or other regulatory agencies for approval.

Acquisitions, Research Collaborations and License Agreements

Merck continues to remain focused on pursuing opportunities that have the potential to drive both near- and long-term growth. Certain recent transactions are described below. Merck is actively monitoring the landscape for growth opportunities that meet the Company’s strategic criteria.

In April 2019, Merck acquired Immune Design, a late-stage immunotherapy company employing next-generation in vivo approaches to enable the body’s immune system to fight disease, for $301 million in cash. The transaction was accounted for as an acquisition of a business. Merck recognized intangible assets for IPR&D of $156 million, cash of $83 million and other net assets of $42 million. The excess of the consideration transferred over the fair value of net assets acquired of $20 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. Actual cash flows are likely to be different than those assumed.

In July 2019, Merck acquired Peloton, a clinical-stage biopharmaceutical company focused on the development of novel small molecule therapeutic candidates targeting hypoxia-inducible factor-2α (HIF-2α) for the treatment of patients with cancer and other non-oncology diseases. Peloton’s lead candidate, MK-6482 (formerly PT2977), is a novel oral HIF-2α inhibitor in late-stage development for renal cell carcinoma. Merck made an upfront payment of $1.2 billion in cash; additionally, former Peloton shareholders will be eligible to receive $50 million upon U.S. regulatory approval, $50 million upon first commercial sale in the United States, and up to $1.05 billion of sales-based milestones. The transaction was accounted for as an acquisition of an asset. Merck recorded cash of $157 million, deferred tax liabilities of $52 million, and other net liabilities of $4 million at the acquisition date and Research and development expenses of $993 million in 2019 related to the transaction.

In January 2020, Merck acquired ArQule, Inc. (ArQule), a publicly traded biopharmaceutical company focused on kinase inhibitor discovery and development for the treatment of patients with cancer and other diseases for $2.7 billion. ArQule’s lead investigational candidate, MK-1026 (formerly ARQ 531), is a novel, oral Bruton’s tyrosine kinase (BTK) inhibitor currently in a Phase 2 dose expansion study for the treatment of B-cell malignancies. The Company is in the process of determining the preliminary fair value of assets acquired, liabilities assumed and total consideration transferred in this transaction, which will be accounted for as an acquisition of a business.

Capital Expenditures

Capital expenditures were $3.5 billion in 2019, $2.6 billion in 2018 and $1.9 billion in 2017. Expenditures in the United States were $1.9 billion in 2019, $1.5 billion in 2018 and $1.2 billion in 2017. The increased capital expenditures in 2019 reflect investment in new capital projects focused primarily on increasing manufacturing capacity for Merck’s key products. As previously announced, the Company plans to invest more than $19 billion in new capital projects from 2019-2023.

Depreciation expense was $1.7 billion in 2019, $1.4 billion in 2018 and $1.5 billion in 2017, of which $1.2 billion in 2019, $1.0 billion in 2018 and $1.0 billion in 2017, related to locations in the United States. Total depreciation expense in 2019 and 2017 included accelerated depreciation of $233 million and $60 million, respectively, associated with restructuring activities (see Note 5 to the consolidated financial statements).

Analysis of Liquidity and Capital Resources

Merck’s strong financial profile enables it to fund research and development, focus on external alliances, support in-line products and maximize upcoming launches while providing significant cash returns to shareholders.

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Selected Data
($ in millions)	2019			2018			2017
Working capital	$	5,263		$	3,669		$	6,152
Total debt to total liabilities and equity	31.2		%	30.4		%	27.8		%
Cash provided by operations to total debt	0.5:1			0.4:1			0.3:1

Cash provided by operating activities was $13.4 billion in 2019 compared with $10.9 billion in 2018, reflecting stronger operating performance and increased accounts receivable factoring as discussed below. Cash provided by operating activities continues to be the Company’s primary source of funds to finance operating needs, capital expenditures, treasury stock purchases and dividends paid to shareholders.

Cash used in investing activities was $2.6 billion in 2019 compared with cash provided by investing activities of $4.3 billion in 2018. The change was driven primarily by lower proceeds from the sales of securities and other investments, the acquisitions of Antelliq and Peloton in 2019, and higher capital expenditures, partially offset by lower purchases of securities and other investments.

Cash used in financing activities was $8.9 billion in 2019 compared with $13.2 billion in 2018. The lower use of cash in financing activities was driven primarily by proceeds from the issuance of debt and lower purchases of treasury stock reflecting the accelerated share repurchase (ASR) program in 2018 as discussed below, as well as lower payments on debt, partially offset by the repayment of short-term borrowings, higher dividends paid to shareholders and lower proceeds from the exercise of stock options.

The Company has accounts receivable factoring agreements with financial institutions in certain countries to sell accounts receivable (see Note 6 to the consolidated financial statements). The Company factored $2.7 billion and $1.1 billion of accounts receivable in the fourth quarter of 2019 and 2018, respectively, under these factoring arrangements, which reduced outstanding accounts receivable. The cash received from the financial institutions is reported within operating activities in the Consolidated Statement of Cash Flows. In certain of these factoring arrangements, for ease of administration, the Company will collect customer payments related to the factored receivables, which it then remits to the financial institutions. At December 31, 2019, the Company had collected $256 million on behalf of the financial institutions, which was remitted to them in January 2020. The net cash flows from these collections are reported as financing activities in the Consolidated Statement of Cash Flows.

The Company’s contractual obligations as of December 31, 2019 are as follows:

Payments Due by Period
($ in millions)	Total		2020		2021—2022		2023—2024		Thereafter
Purchase obligations (1)	$	3,167	$	1,097	$	1,108	$	421	$	541
Loans payable and current portion of long-term debt	3,612		3,612		—		—		—
Long-term debt	22,779		—		4,515		3,058		15,206
Interest related to debt obligations	10,021		760		1,372		1,189		6,700
Unrecognized tax benefits (2)	49		49		—		—		—
Transition tax related to the enactment of the TCJA (3)	3,397		390		781		1,181		1,045
Milestone payments related to collaborations (4)	400		400		—		—		—
Leases (5)	1,012		254		354		202		202
	$	44,437	$	6,562	$	8,130	$	6,051	$	23,694

⁽¹⁾   Includes future inventory purchases the Company has committed to in connection with certain divestitures.

⁽²⁾   As of December 31, 2019, the Company’s Consolidated Balance Sheet reflects liabilities for unrecognized tax benefits, interest and penalties of $1.5 billion, including $49 million reflected as a current liability. Due to the high degree of uncertainty regarding the timing of future cash outflows of liabilities for unrecognized tax benefits beyond one year, a reasonable estimate of the period of cash settlement for years beyond 2020 cannot be made.

⁽³⁾   In connection with the enactment of the TCJA, the Company is required to pay a one-time transition tax, which the Company has elected to pay over a period of eight years through 2025 as permitted under the TCJA (see Note 15 to the consolidated financial statements).

⁽⁴⁾   Reflects payments under collaborative agreements for sales-based milestones that were achieved in 2019 (and therefore deemed to be contractual obligations) but not paid until January 2020 (see Note 4 to the consolidated financial statements).

⁽⁵⁾ Amounts exclude reasonably certain lease renewals that have not yet been executed (see Note 9 to the consolidated financial statements).

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Purchase obligations are enforceable and legally binding obligations for purchases of goods and services including minimum inventory contracts, research and development and advertising. Amounts do not include contingent milestone payments related to collaborative arrangements or acquisitions as they are not considered contractual obligations until the successful achievement of developmental, regulatory approval or commercial milestones. At December 31, 2019, the Company has recognized liabilities for contingent sales-based milestone payments related to collaborations with AstraZeneca, Eisai and Bayer where payment remains subject to the achievement of the related sales milestone aggregating $1.4 billion (see Note 4 to the consolidated financial statements). Excluded from research and development obligations are potential future funding commitments of up to approximately $60 million for investments in research venture capital funds. Loans payable and current portion of long-term debt reflects $226 million of long-dated notes that are subject to repayment at the option of the holders. Required funding obligations for 2020 relating to the Company’s pension and other postretirement benefit plans are not expected to be material. However, the Company currently anticipates contributing approximately $100 million to its U.S. pension plans, $150 million to its international pension plans and $15 million to its other postretirement benefit plans during 2020.

In March 2019, the Company issued $5.0 billion principal amount of senior unsecured notes consisting of $750 million of 2.90% notes due 2024, $1.75 billion of 3.40% notes due 2029, $1.0 billion of 3.90% notes due 2039, and $1.5 billion of 4.00% notes due 2049. The Company used the net proceeds from the offering of $5.0 billion for general corporate purposes, including the repayment of outstanding commercial paper borrowings.

In December 2018, the Company exercised a make-whole provision on its $1.25 billion, 5.00% notes due 2019 and repaid this debt.

In November 2017, the Company launched tender offers for certain outstanding notes and debentures. The Company paid $810 million in aggregate consideration (applicable purchase price together with accrued interest) to redeem $585 million principal amount of debt that was validly tendered in connection with the tender offers.

The Company has a $6.0 billion credit facility that matures in June 2024. 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.

In March 2018, the Company filed a securities registration statement with the U.S. Securities and Exchange Commission (SEC) under the automatic shelf registration process available to “well-known seasoned issuers” which is effective for three years.

Effective as of November 3, 2009, the Company executed a full and unconditional guarantee of the then existing debt of its subsidiary Merck Sharp & Dohme Corp. (MSD) and MSD executed a full and unconditional guarantee of the then existing debt of the Company (excluding commercial paper), including for payments of principal and interest. These guarantees do not extend to debt issued subsequent to that date.

The Company continues to maintain a conservative financial profile. The Company places its cash and investments in instruments that meet high credit quality standards, as specified in its investment policy guidelines. These guidelines also limit the amount of credit exposure to any one issuer. The Company does not participate in any off-balance sheet arrangements involving unconsolidated subsidiaries that provide financing or potentially expose the Company to unrecorded financial obligations.

In November 2019, Merck’s Board of Directors declared a quarterly dividend of $0.61 per share on the Company’s outstanding common stock that was paid in January 2020. In January 2020, the Board of Directors declared a quarterly dividend of $0.61 per share on the Company’s common stock for the second quarter of 2020 payable in April 2020.

In October 2018, Merck’s Board of Directors authorized purchases of up to $10 billion of Merck’s common stock for its treasury. The treasury stock purchase authorization 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. The Company spent $4.8 billion to purchase 59 million shares of its common stock for its treasury during 2019. In addition, the Company received 7.7 million shares in settlement of ASR agreements as discussed below. As of December 31, 2019, the Company’s remaining share repurchase authorization was $7.2 billion. The Company purchased $9.1 billion and $4.0 billion of its common stock during 2018 and 2017, respectively, under authorized share repurchase programs.

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On October 25, 2018, the Company entered into ASR agreements with two third-party financial institutions (Dealers). Under the ASR agreements, Merck agreed to purchase $5 billion of Merck’s common stock, in total, with an initial delivery of 56.7 million shares of Merck’s common stock, based on the then-current market price, made by the Dealers to Merck, and payments of $5 billion made by Merck to the Dealers on October 29, 2018, which were funded with existing cash and investments, as well as short-term borrowings. Upon settlement of the ASR agreements in April 2019, Merck received an additional 7.7 million shares as determined by the average daily volume weighted-average price of Merck’s common stock during the term of the ASR program, less a negotiated discount, bringing the total shares received by Merck under this program to 64.4 million.

Financial Instruments Market Risk Disclosures

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 of 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 changes 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, Japanese yen and Chinese renminbi. 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 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.

Because Merck principally sells foreign currency in its revenue hedging program, a uniform weakening of the U.S. dollar would yield the largest overall potential loss in the market value of these hedge instruments. The market value of Merck’s hedges would have declined by an estimated $456 million and $441 million at December 31, 2019 and 2018, respectively, from a uniform 10% weakening of the U.S. dollar. The market value was determined using a foreign exchange option pricing model and holding all factors except exchange rates constant. Although not predictive in nature, the Company believes that a 10% threshold reflects reasonably possible near-term changes in Merck’s major foreign currency exposures relative to the U.S. dollar. The cash flows from these contracts are reported as operating activities in the Consolidated Statement of Cash Flows.

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 Consolidated Statement of Cash Flows.

A sensitivity analysis to changes in the value of the U.S. dollar on foreign currency denominated derivatives, investments and monetary assets and liabilities indicated that if the U.S. dollar uniformly weakened by 10% against

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all currency exposures of the Company at December 31, 2019 and 2018, Income before taxes would have declined by approximately $110 million and $134 million in 2019 and 2018, respectively. Because the Company was in a net short (payable) position relative to its major foreign currencies after consideration of forward contracts, a uniform weakening of the U.S. dollar will yield the largest overall potential net loss in earnings due to exchange. This measurement assumes that a change in one foreign currency relative to the U.S. dollar would not affect other foreign currencies relative to the U.S. dollar. Although not predictive in nature, the Company believes that a 10% threshold reflects reasonably possible near-term changes in Merck’s major foreign currency exposures relative to the U.S. dollar. The cash flows from these contracts are reported as operating activities in the Consolidated Statement of Cash Flows.

The economy of Argentina was determined to be hyperinflationary in 2018; consequently, in accordance with U.S. GAAP, the Company began remeasuring its monetary assets and liabilities for those operations in earnings. The impact to the Company’s results was immaterial.

The Company also uses forward exchange contracts to hedge a portion of 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 unrealized gains or losses on these contracts are recorded in foreign currency translation adjustment within Other Comprehensive Income (Loss) (OCI), and remain in Accumulated Other Comprehensive Income (Loss) (AOCI) until either the sale or complete or substantially complete liquidation of the subsidiary. The Company excludes certain portions of the change in fair value of its derivative instruments from the assessment of hedge effectiveness (excluded component). Changes in fair value of the excluded components are recognized in OCI. The Company recognizes in earnings the initial value of the excluded component on a straight-line basis over the life of the derivative instrument, rather than using the mark-to-market approach. The cash flows from these contracts are reported as investing activities in the 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.

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 December 31, 2019, the Company was a party to 19 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)	2019
Debt Instrument	Par Value of Debt		Number of Interest Rate Swaps Held	Total Swap Notional Amount
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 along with the offsetting fair value changes in the swap contracts. The cash flows from these contracts are reported as operating activities in the Consolidated Statement of Cash Flows.

The Company’s investment portfolio includes cash equivalents and short-term investments, the market values of which are not significantly affected by changes in interest rates. The market value of the Company’s medium- to long-term fixed-rate investments is modestly affected by changes in U.S. interest rates. Changes in medium- to long-term U.S. interest rates have a more significant impact on the market value of the Company’s fixed-rate borrowings, which generally have longer maturities. A sensitivity analysis to measure potential changes in the market value of

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Merck’s investments and debt from a change in interest rates indicated that a one percentage point increase in interest rates at December 31, 2019 and 2018 would have positively affected the net aggregate market value of these instruments by $2.0 billion and $1.2 billion, respectively. A one percentage point decrease at December 31, 2019 and 2018 would have negatively affected the net aggregate market value by $2.2 billion and $1.4 billion, respectively. The fair value of Merck’s debt was determined using pricing models reflecting one percentage point shifts in the appropriate yield curves. The fair values of Merck’s investments were determined using a combination of pricing and duration models.

Critical Accounting Policies

The Company’s consolidated financial statements are prepared in conformity with GAAP and, accordingly, include certain amounts that are based on management’s best estimates and judgments. Estimates are used when accounting for amounts recorded in connection with acquisitions, including initial fair value determinations of assets and liabilities, primarily IPR&D, other intangible assets and contingent consideration, as well as subsequent fair value measurements. Additionally, estimates are used in determining such items as provisions for sales discounts and returns, depreciable and amortizable lives, recoverability of inventories, including those produced in preparation for product launches, amounts recorded for contingencies, environmental liabilities, accruals for contingent sales-based milestone payments and other reserves, pension and other postretirement benefit plan assumptions, share-based compensation assumptions, restructuring costs, impairments of long-lived assets (including intangible assets and goodwill) and investments, and taxes on income. Because of the uncertainty inherent in such estimates, actual results may differ from these estimates. Application of the following accounting policies result in accounting estimates having the potential for the most significant impact on the financial statements.

Acquisitions and Dispositions

To determine whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses, the Company makes certain judgments, which include assessment of the inputs, processes, and outputs associated with the acquired set of activities. If the Company determines that substantially all of the fair value of gross assets included in a transaction is concentrated in a single asset (or a group of similar assets), the assets would not represent a business. To be considered a business, the assets in a transaction need to include an input and a substantive process that together significantly contribute to the ability to create outputs.

In a business combination, the acquisition method of accounting requires that the assets acquired and liabilities assumed be recorded as of the date of the acquisition at their respective fair values with limited exceptions. Assets acquired and liabilities assumed in a business combination that arise from contingencies are generally recognized at fair value. If fair value cannot be determined, the asset or liability is recognized if probable and reasonably estimable; if these criteria are not met, no asset or liability is recognized. 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. Accordingly, the Company may be required to value assets at fair value measures that do not reflect the Company’s intended use of those assets. Any excess of the purchase price (consideration transferred) over the estimated fair values of net assets acquired is recorded as goodwill. Transaction costs and costs to restructure the acquired company are expensed as incurred. The operating results of the acquired business are reflected in the Company’s consolidated financial statements after the date of the acquisition. The fair values of intangible assets, including acquired IPR&D, are determined utilizing information available near the acquisition date based on expectations and assumptions that are deemed reasonable by management. Given the considerable judgment involved in determining fair values, the Company typically obtains assistance from third-party valuation specialists for significant items. Amounts allocated to acquired IPR&D are capitalized and accounted for as indefinite-lived intangible assets, subject to impairment testing until completion or abandonment of the projects. Upon successful completion of each project, Merck will make a determination as to the then-useful life of the intangible asset, generally determined by the period in which the substantial majority of the cash flows are expected to be generated, and begin amortization. Certain of the Company’s business acquisitions involve the potential for future payment of consideration that is contingent upon the achievement of performance milestones, including product development milestones and royalty payments on future product sales. The fair value of contingent consideration liabilities is determined at the acquisition date using unobservable inputs. These inputs include the estimated amount and timing of projected cash flows, the probability of success (achievement of the contingent event) and the risk-adjusted discount rate used to present value the probability-weighted cash flows. Subsequent to the acquisition date, at each reporting period until the contingency is resolved, the contingent consideration liability is

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remeasured at current fair value with changes (either expense or income) recorded in earnings. Changes in any of the inputs may result in a significantly different fair value adjustment.

The judgments made in determining estimated fair values assigned to assets acquired and liabilities assumed in a business combination, as well as asset lives, can materially affect the Company’s results of operations.

The fair values of identifiable intangible assets related to currently marketed products and product rights are primarily determined by using an income approach through which fair value is estimated based on each asset’s discounted projected net cash flows. The Company’s estimates of market participant net cash flows consider historical and projected pricing, margins and expense levels; the performance of competing products where applicable; relevant industry and therapeutic area growth drivers and factors; current and expected trends in technology and product life cycles; the time and investment that will be required to develop products and technologies; the ability to obtain marketing and regulatory approvals; the ability to manufacture and commercialize the products; the extent and timing of potential new product introductions by the Company’s competitors; and the life of each asset’s underlying patent, if any. The net cash flows are then probability-adjusted where appropriate to consider the uncertainties associated with the underlying assumptions, as well as the risk profile of the net cash flows utilized in the valuation. The probability-adjusted future net cash flows of each product are then discounted to present value utilizing an appropriate discount rate.

The fair values of identifiable intangible assets related to IPR&D are also determined using an income approach, through which fair value is estimated based on each asset’s probability-adjusted future net cash flows, which reflect the different stages of development of each product and the associated probability of successful completion. The net cash flows are then discounted to present value using an appropriate discount rate.

If the Company determines the transaction will not be accounted for as an acquisition of a business, the transaction will be accounted for as an asset acquisition rather than a business combination and, therefore, no goodwill will be recorded. In an asset acquisition, acquired IPR&D with no alternative future use is charged to expense and contingent consideration is not recognized at the acquisition date. In these instances, product development milestones are recognized upon achievement and sales-based milestones are recognized when the milestone is deemed probable by the Company of being achieved.

Revenue Recognition

Recognition of revenue requires evidence of a contract, probable collection of sales proceeds and completion of substantially all performance obligations. Merck acts as the principal in substantially all of its customer arrangements and therefore records revenue on a gross basis. The majority of the Company’s contracts related to the Pharmaceutical and Animal Health segments have a single performance obligation - the promise to transfer goods. Shipping is considered immaterial in the context of the overall customer arrangement and damages or loss of goods in transit are rare. Therefore, shipping is not deemed a separately recognized performance obligation.

The vast majority of revenues from sales of products are recognized at a point in time when control of the goods is transferred to the customer, which the Company has determined is when title and risks and rewards of ownership transfer to the customer and the Company is entitled to payment. For businesses within the Company’s Healthcare Services segment and certain services in the Animal Health segment, revenue is recognized over time, generally ratably over the contract term as services are provided. These service revenues are not material.

The nature of the Company’s business gives rise to several types of variable consideration including discounts and returns, which are estimated at the time of sale generally using the expected value method, although the most likely amount method is used for prompt pay discounts.

In the United States, sales discounts are issued to customers at the point-of-sale, through an intermediary wholesaler (known as chargebacks), or in the form of rebates. Additionally, sales are generally made with a limited right of return under certain conditions. Revenues are recorded net of provisions for sales discounts and returns, which are established at the time of sale. In addition, revenues are recorded net of time value of money discounts if collection of accounts receivable is expected to be in excess of one year.

The U.S. provision for aggregate customer discounts covers chargebacks and rebates. Chargebacks are discounts that occur when a contracted customer purchases through an intermediary wholesaler. The contracted customer generally purchases product from the wholesaler at its contracted price plus a mark-up. The wholesaler, in turn, charges

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the Company back for the difference between the price initially paid by the wholesaler and the contract price paid to the wholesaler by the customer. The provision for chargebacks is based on expected sell-through levels by the Company’s wholesale customers to contracted customers, as well as estimated wholesaler inventory levels. Rebates are amounts 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. The provision for rebates is based on expected patient usage, as well as inventory levels in the distribution channel to determine the contractual obligation to the benefit providers. The Company uses historical customer segment utilization mix, sales forecasts, changes to product mix and price, inventory levels in the distribution channel, government pricing calculations and prior payment history in order to estimate the expected provision. Amounts accrued for aggregate customer discounts are evaluated on a quarterly basis through comparison of information provided by the wholesalers, health maintenance organizations, pharmacy benefit managers, federal and state agencies, and other customers to the amounts accrued.

The Company continually monitors its provision for aggregate customer discounts. There were no material adjustments to estimates associated with the aggregate customer discount provision in 2019, 2018 or 2017.

Summarized information about changes in the aggregate customer discount accrual related to U.S. sales is as follows:

($ in millions)	2019			2018
Balance January 1	$	2,630		$	2,551
Current provision	11,999			10,837
Adjustments to prior years	(230		)	(117		)
Payments	(11,963		)	(10,641		)
Balance December 31	$	2,436		$	2,630

Accruals for chargebacks are reflected as a direct reduction to accounts receivable and accruals for rebates as current liabilities. The accrued balances relative to these provisions included in Accounts receivable and Accrued and other current liabilities were $233 million and $2.2 billion, respectively, at December 31, 2019 and were $245 million and $2.4 billion, respectively, at December 31, 2018.

Outside of the United States, variable consideration in the form of discounts and rebates are a combination of commercially-driven discounts in highly competitive product classes, discounts required to gain or maintain reimbursement, or legislatively mandated rebates. In certain European countries, legislatively mandated rebates are calculated based on an estimate of the government’s total unbudgeted spending and the Company’s specific payback obligation. Rebates may also be required based on specific product sales thresholds. The Company applies an estimated factor against its actual invoiced sales to represent the expected level of future discount or rebate obligations associated with the sale.

The Company maintains a returns policy that allows its U.S. pharmaceutical customers to return product within a specified period prior to and subsequent to the expiration date (generally, three to six months before and 12 months after product expiration). The estimate of the provision for returns is based upon historical experience with actual returns. Additionally, the Company considers factors such as levels of inventory in the distribution channel, product dating and expiration period, whether products have been discontinued, entrance in the market of generic competition, changes in formularies or launch of over-the-counter products, among others. The product returns provision for U.S. pharmaceutical sales as a percentage of U.S. net pharmaceutical sales was 1.1% in 2019, 1.6% in 2018 and 2.1% in 2017. Outside of the United States, returns are only allowed in certain countries on a limited basis.

Merck’s payment terms for U.S. pharmaceutical customers are typically 36 days from receipt of invoice and for U.S. animal health customers are typically 30 days from receipt of invoice; however, certain products, including Keytruda, have longer payment terms up to 90 days. Outside of the United States, payment terms are typically 30 days to 90 days, although certain markets have longer payment terms.

Through its distribution programs with U.S. wholesalers, the Company encourages wholesalers to align purchases with underlying demand and maintain inventories below specified levels. The terms of the programs allow the wholesalers to earn fees upon providing visibility into their inventory levels, as well as by achieving certain performance parameters such as inventory management, customer service levels, reducing shortage claims and reducing

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product returns. Information provided through the wholesaler distribution programs includes items such as sales trends, inventory on-hand, on-order quantity and product returns.

Wholesalers generally provide only the above-mentioned data to the Company, as there is no regulatory requirement to report lot level information to manufacturers, which is the level of information needed to determine the remaining shelf life and original sale date of inventory. Given current wholesaler inventory levels, which are generally less than a month, the Company believes that collection of order lot information across all wholesale customers would have limited use in estimating sales discounts and returns.

Inventories Produced in Preparation for Product Launches

The Company capitalizes inventories produced in preparation for product launches sufficient to support estimated initial market demand. Typically, capitalization of such inventory does not begin until the related product candidates are in Phase 3 clinical trials and are considered to have a high probability of regulatory approval. The Company monitors the status of each respective product within the regulatory approval process; however, the Company generally does not disclose specific timing for regulatory approval. If the Company is aware of any specific risks or contingencies other than the normal regulatory approval process or if there are any specific issues identified during the research process relating to safety, efficacy, manufacturing, marketing or labeling, the related inventory would generally not be capitalized. Expiry dates of the inventory are affected by the stage of completion. The Company manages the levels of inventory at each stage to optimize the shelf life of the inventory in relation to anticipated market demand in order to avoid product expiry issues. For inventories that are capitalized, anticipated future sales and shelf lives support the realization of the inventory value as the inventory shelf life is sufficient to meet initial product launch requirements. Inventories produced in preparation for product launches capitalized at December 31, 2019 and 2018 were $168 million and $7 million, respectively.

Contingencies and Environmental Liabilities

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 governmental and environmental matters (see Note 10 to the consolidated financial statements). 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. 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 December 31, 2019 and 2018 of approximately $240 million and $245 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.

The Company and its subsidiaries are parties to a number of proceedings brought under the Comprehensive Environmental Response, Compensation and Liability Act, commonly known as Superfund, and other federal and state equivalents. When a legitimate claim for contribution is asserted, a liability is initially accrued based upon the estimated transaction costs to manage the site. Accruals are adjusted as site investigations, feasibility studies and related cost assessments of remedial techniques are completed, and as the extent to which other potentially responsible parties who may be jointly and severally liable can be expected to contribute is determined.

The Company is also remediating environmental contamination resulting from past industrial activity at certain of its sites and takes an active role in identifying and accruing for these costs. In the past, Merck performed a worldwide survey to assess all sites for potential contamination resulting from past industrial activities. Where

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assessment indicated that physical investigation was warranted, such investigation was performed, providing a better evaluation of the need for remedial action. Where such need was identified, remedial action was then initiated. As definitive information became available during the course of investigations and/or remedial efforts at each site, estimates were refined and accruals were established or adjusted accordingly. These estimates and related accruals continue to be refined annually.

The Company believes that there are no compliance issues associated with applicable environmental laws and regulations that would have a material adverse effect on the Company. Expenditures for remediation and environmental liabilities were $19 million in 2019 and are estimated at $47 million in the aggregate for the years 2020 through 2024. In management’s opinion, the liabilities for all environmental matters that are probable and reasonably estimable have been accrued and totaled $67 million and $71 million at December 31, 2019 and 2018, respectively. These liabilities are undiscounted, do not consider potential recoveries from other parties and will be paid out over the periods of remediation for the applicable sites, which are expected to occur primarily over the next 15 years. Although it is not possible to predict with certainty the outcome of these matters, or the ultimate costs of remediation, management does not believe that any reasonably possible expenditures that may be incurred in excess of the liabilities accrued should exceed $58 million in the aggregate. Management also does not believe that these expenditures should result in a material adverse effect on the Company’s financial condition, results of operations or liquidity for any year.

Share-Based Compensation

The Company expenses all share-based payment awards to employees, including grants of stock options, over the requisite service period based on the grant date fair value of the awards. The Company determines the fair value of certain share-based awards using the Black-Scholes option-pricing model which uses both historical and current market data to estimate the fair value. This method incorporates various assumptions such as the risk-free interest rate, expected volatility, expected dividend yield and expected life of the options. Total pretax share-based compensation expense was $417 million in 2019, $348 million in 2018 and $312 million in 2017. At December 31, 2019, there was $603 million of total pretax unrecognized compensation expense related to nonvested stock option, restricted stock unit and performance share unit awards which will be recognized over a weighted average period of 1.9 years. For segment reporting, share-based compensation costs are unallocated expenses.

Pensions and Other Postretirement Benefit Plans

Net periodic benefit cost for pension plans totaled $137 million in 2019, $195 million in 2018 and $201 million in 2017. Net periodic benefit (credit) for other postretirement benefit plans was $(49) million in 2019, $(45) million in 2018 and $(60) million in 2017. Pension and other postretirement benefit plan information for financial reporting purposes is calculated using actuarial assumptions including a discount rate for plan benefit obligations and an expected rate of return on plan assets. The changes in net periodic benefit cost year over year for pension plans are largely attributable to changes in the discount rate affecting net loss amortization.

The Company reassesses its benefit plan assumptions on a regular basis. For both the pension and other postretirement benefit plans, the discount rate is evaluated on measurement dates and modified to reflect the prevailing market rate of a portfolio of high-quality fixed-income debt instruments that would provide the future cash flows needed to pay the benefits included in the benefit obligation as they come due. The discount rates for the Company’s U.S. pension and other postretirement benefit plans ranged from 3.20% to 3.50% at December 31, 2019, compared with a range of 4.00% to 4.40% at December 31, 2018.

The expected rate of return for both the pension and other postretirement benefit plans represents the average rate of return to be earned on plan assets over the period the benefits included in the benefit obligation are to be paid. In developing the expected rate of return, the Company considers long-term compound annualized returns of historical market data, current market conditions and actual returns on the Company’s plan assets. Using this reference information, the Company develops forward-looking return expectations for each asset category and a weighted-average expected long-term rate of return for a target portfolio allocated across these investment categories. The expected portfolio performance reflects the contribution of active management as appropriate. For 2020, the expected rate of return for the Company’s U.S. pension and other postretirement benefit plans will range from 7.00% to 7.30%, compared to a range of 7.70% to 8.10% in 2019. The decrease reflects lower expected asset returns and a modest shift in asset allocation.

The Company has established investment guidelines for its U.S. pension and other postretirement plans to create an asset allocation that is expected to deliver a rate of return sufficient to meet the long-term obligation of each plan, given an acceptable level of risk. The target investment portfolio of the Company’s U.S. pension and other

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postretirement benefit plans is allocated 30% to 45% in U.S. equities, 15% to 30% in international equities, 35% to 45% in fixed-income investments, and up to 5% in cash and other investments. The portfolio’s equity weighting is consistent with the long-term nature of the plans’ benefit obligations. The expected annual standard deviation of returns of the target portfolio, which approximates 10%, reflects both the equity allocation and the diversification benefits among the asset classes in which the portfolio invests. For non-U.S. pension plans, the targeted investment portfolio varies based on the duration of pension liabilities and local government rules and regulations. Although a significant percentage of plan assets are invested in U.S. equities, concentration risk is mitigated through the use of strategies that are diversified within management guidelines.

Actuarial assumptions are based upon management’s best estimates and judgment. A reasonably possible change of plus (minus) 25 basis points in the discount rate assumption, with other assumptions held constant, would have had an estimated $70 million favorable (unfavorable) impact on the Company’s net periodic benefit cost in 2019. A reasonably possible change of plus (minus) 25 basis points in the expected rate of return assumption, with other assumptions held constant, would have had an estimated $50 million favorable (unfavorable) impact on Merck’s net periodic benefit cost in 2019. Required funding obligations for 2020 relating to the Company’s pension and other postretirement benefit plans are not expected to be material. The preceding hypothetical changes in the discount rate and expected rate of return assumptions would not impact the Company’s funding requirements.

Net loss amounts, which reflect experience differentials primarily relating to differences between expected and actual returns on plan assets as well as the effects of changes in actuarial assumptions, are recorded as a component of AOCI. Expected returns for pension plans are based on a calculated market-related value of assets. Under this methodology, asset gains/losses resulting from actual returns that differ from the Company’s expected returns are recognized in the market-related value of assets ratably over a five-year period. Also, net loss amounts in AOCI in excess of certain thresholds are amortized into net periodic benefit cost over the average remaining service life of employees.

Restructuring Costs

Restructuring costs have been recorded in connection with restructuring programs designed to streamline the Company’s cost structure. As a result, the Company has made estimates and judgments regarding its future plans, including future termination benefits and other exit costs to be incurred when the restructuring actions take place. When accruing termination costs, the Company will recognize the amount within a range of costs that is the best estimate within the range. When no amount within the range is a better estimate than any other amount, the Company recognizes the minimum amount within the range. In connection with these actions, management also assesses the recoverability of long-lived assets employed in the business. In certain instances, asset lives have been shortened based on changes in the expected useful lives of the affected assets. Severance and other related costs are reflected within Restructuring costs. Asset-related charges are reflected within Cost of sales, Selling, general and administrative expenses and Research and development expenses depending upon the nature of the asset.

Impairments of Long-Lived Assets

The Company assesses changes in economic, regulatory and legal conditions and makes assumptions regarding estimated future cash flows in evaluating the value of the Company’s property, plant and equipment, goodwill and other intangible assets.

The Company periodically evaluates whether current facts or circumstances indicate that the carrying values of its long-lived assets to be held and used may not be recoverable. If such circumstances are determined to exist, an estimate of the undiscounted future cash flows of these assets, or appropriate asset groupings, is compared to the carrying value to determine whether an impairment exists. If the asset is determined to be impaired, the loss is measured based on the difference between the asset’s fair value and its carrying value. If quoted market prices are not available, the Company will estimate fair value using a discounted value of estimated future cash flows approach.

Goodwill represents the excess of the consideration transferred over the fair value of net assets of businesses acquired. Goodwill is assigned to reporting units and evaluated for impairment on at least an annual basis, or more frequently if impairment indicators exist, by first assessing qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. Some of the factors considered in the assessment include general macroeconomic conditions, conditions specific to the industry and market, cost factors which could have a significant effect on earnings or cash flows, the overall financial performance of the reporting unit, and whether there have been sustained declines in the Company’s share price. If the Company concludes it is more

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likely than not that the fair value of a reporting unit is less than its carrying amount, a quantitative fair value test is performed. If the carrying value of a reporting unit is greater than its fair value, a goodwill impairment charge will be recorded for the difference (up to the carrying value of goodwill).

Other acquired intangible assets (excluding IPR&D) are initially recorded at fair value, assigned an estimated useful life, and amortized primarily on a straight-line basis over their estimated useful lives. When events or circumstances warrant a review, the Company will assess recoverability from future operations using pretax undiscounted cash flows derived from the lowest appropriate asset groupings. Impairments are recognized in operating results to the extent that the carrying value of the intangible asset exceeds its fair value, which is determined based on the net present value of estimated future cash flows.

IPR&D that the Company acquires in conjunction with the acquisition of a business represents the fair value assigned to incomplete research projects which, at the time of acquisition, have not reached technological feasibility. The amounts are capitalized and accounted for as indefinite-lived intangible assets, subject to impairment testing until completion or abandonment of the projects. The Company evaluates IPR&D for impairment at least annually, or more frequently if impairment indicators exist, by performing a quantitative test that compares the fair value of the IPR&D intangible asset with its carrying value. For impairment testing purposes, the Company may combine separately recorded IPR&D intangible assets into one unit of account based on the relevant facts and circumstances. Generally, the Company will combine IPR&D intangible assets for testing purposes if they operate as a single asset and are essentially inseparable. If the fair value is less than the carrying amount, an impairment loss is recognized in operating results.

The judgments made in evaluating impairment of long-lived intangibles can materially affect the Company’s results of operations.

Impairments of Investments

The Company reviews its investments in marketable debt securities for impairments based on the determination of whether the decline in market value of the investment below the carrying value is other-than-temporary. The Company considers available evidence in evaluating potential impairments of its investments in marketable debt securities, including the duration and extent to which fair value is less than cost. Changes in fair value that are considered temporary are reported net of tax in OCI. An other-than-temporary impairment has occurred if the Company does not expect to recover the entire amortized cost basis of the marketable debt security. If the Company does not intend to sell the impaired debt security, and it is not more likely than not it will be required to sell the debt security before the recovery of its amortized cost basis, the amount of the other-than-temporary impairment recognized in earnings, recorded in Other (income) expense, net, is limited to the portion attributed to credit loss. The remaining portion of the other-than-temporary impairment related to other factors is recognized in OCI.

Investments in publicly traded equity securities are reported at fair value determined using quoted market prices in active markets for identical assets or quoted prices for similar assets or other inputs that are observable or can be corroborated by observable market data. Changes in fair value are included in Other (income) expense, net. Investments in equity securities without readily determinable fair values are recorded at cost, plus or minus subsequent observable price changes in orderly transactions for identical or similar investments, minus impairments. Such adjustments are recognized in Other (income) expense, net. Realized gains and losses for equity securities are included in Other (income) expense, net.

Taxes on Income

The Company’s effective tax rate is based on pretax income, statutory tax rates and tax planning opportunities available in the various jurisdictions in which the Company operates. An estimated effective tax rate for a year is applied to the Company’s quarterly operating results. In the event that there is a significant unusual or one-time item recognized, or expected to be recognized, in the Company’s quarterly operating results, the tax attributable to that item would be separately calculated and recorded at the same time as the unusual or one-time item. The Company considers the resolution of prior year tax matters to be such items. Significant judgment is required in determining the Company’s tax provision and in evaluating its tax positions. The recognition and measurement of a tax position is based on management’s best judgment given the facts, circumstances and information available at the reporting date. The Company evaluates tax positions to determine whether the benefits of tax positions are more likely than not of being sustained upon audit based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained upon audit, the Company recognizes the largest amount of the benefit that is greater than 50% likely

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of being realized upon ultimate settlement in the financial statements. For tax positions that are not more likely than not of being sustained upon audit, the Company does not recognize any portion of the benefit in the financial statements. If the more likely than not threshold is not met in the period for which a tax position is taken, the Company may subsequently recognize the benefit of that tax position if the tax matter is effectively settled, the statute of limitations expires, or if the more likely than not threshold is met in a subsequent period (see Note 15 to the consolidated financial statements).

Tax regulations require items to be included in the tax return at different times than the items are reflected in the financial statements. Timing differences create deferred tax assets and liabilities. Deferred tax assets generally represent items that can be used as a tax deduction or credit in the tax return in future years for which the Company has already recorded the tax benefit in the financial statements. The Company establishes valuation allowances for its deferred tax assets when the amount of expected future taxable income is not likely to support the use of the deduction or credit. Deferred tax liabilities generally represent tax expense recognized in the financial statements for which payment has been deferred or expense for which the Company has already taken a deduction on the tax return, but has not yet recognized as expense in the financial statements.

Recently Issued Accounting Standards

For a discussion of recently issued accounting standards, see Note 2 to the consolidated financial statements.

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, or negative variations of any of the foregoing. 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 this Form 10-K and Forms 10-Q and 8-K. In Item 1A. “Risk Factors” of this annual report on Form 10-K 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.

Item 7A. Quantitative and Qualitative Disclosures about Market Risk.

The information required by this Item is incorporated by reference to the discussion under “Financial Instruments Market Risk Disclosures” in Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

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Item 8. Financial Statements and Supplementary Data.                

(a) Financial Statements

The consolidated balance sheet of Merck & Co., Inc. and subsidiaries as of December 31, 2019 and 2018, and the related consolidated statements of income, of comprehensive income, of equity and of cash flows for each of the three years in the period ended December 31, 2019, the notes to consolidated financial statements, and the report dated February 26, 2020 of PricewaterhouseCoopers LLP, independent registered public accounting firm, are as follows:

Consolidated Statement of Income

Merck & Co., Inc. and Subsidiaries

Years Ended December 31

($ in millions except per share amounts)

	2019			2018			2017
Sales	$	46,840		$	42,294		$	40,122
Costs, Expenses and Other
Cost of sales	14,112			13,509			12,912
Selling, general and administrative	10,615			10,102			10,074
Research and development	9,872			9,752			10,339
Restructuring costs	638			632			776
Other (income) expense, net	139			(402		)	(500		)
	35,376			33,593			33,601
Income Before Taxes	11,464			8,701			6,521
Taxes on Income	1,687			2,508			4,103
Net Income	9,777			6,193			2,418
Less: Net (Loss) Income Attributable to Noncontrolling Interests	(66		)	(27		)	24
Net Income Attributable to Merck & Co., Inc.	$	9,843		$	6,220		$	2,394
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders	$	3.84		$	2.34		$	0.88
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders	$	3.81		$	2.32		$	0.87

Consolidated Statement of Comprehensive Income

Merck & Co., Inc. and Subsidiaries

Years Ended December 31

($ in millions)

	2019			2018			2017
Net Income Attributable to Merck & Co., Inc.	$	9,843		$	6,220		$	2,394
Other Comprehensive (Loss) Income Net of Taxes:
Net unrealized (loss) gain on derivatives, net of reclassifications	(135		)	297			(446		)
Net unrealized gain (loss) on investments, net of reclassifications	96			(10		)	(58		)
Benefit plan net (loss) gain and prior service (cost) credit, net of amortization	(705		)	(425		)	419
Cumulative translation adjustment	96			(223		)	401
	(648		)	(361		)	316
Comprehensive Income Attributable to Merck & Co., Inc.	$	9,195		$	5,859		$	2,710

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

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Consolidated Balance Sheet

Merck & Co., Inc. and Subsidiaries

December 31

($ in millions except per share amounts)

	2019			2018
Assets
Current Assets
Cash and cash equivalents	$	9,676		$	7,965
Short-term investments	774			899
Accounts receivable (net of allowance for doubtful accounts of $86 in 2019 and $119 in 2018)	6,778			7,071
Inventories (excludes inventories of $1,480 in 2019 and $1,417 in 2018 classified in Other assets - see Note 7)	5,978			5,440
Other current assets	4,277			4,500
Total current assets	27,483			25,875
Investments	1,469			6,233
Property, Plant and Equipment (at cost)
Land	343			333
Buildings	11,989			11,486
Machinery, equipment and office furnishings	15,394			14,441
Construction in progress	5,013			3,355
	32,739			29,615
Less: accumulated depreciation	17,686			16,324
	15,053			13,291
Goodwill	19,425			18,253
Other Intangibles, Net	14,196			13,104
Other Assets	6,771			5,881
	$	84,397		$	82,637
Liabilities and Equity
Current Liabilities
Loans payable and current portion of long-term debt	$	3,610		$	5,308
Trade accounts payable	3,738			3,318
Accrued and other current liabilities	12,549			10,151
Income taxes payable	736			1,971
Dividends payable	1,587			1,458
Total current liabilities	22,220			22,206
Long-Term Debt	22,736			19,806
Deferred Income Taxes	1,470			1,702
Other Noncurrent Liabilities	11,970			12,041
Merck & Co., Inc. Stockholders’ Equity
Common stock, $0.50 par value Authorized - 6,500,000,000 shares Issued - 3,577,103,522 shares in 2019 and 2018	1,788			1,788
Other paid-in capital	39,660			38,808
Retained earnings	46,602			42,579
Accumulated other comprehensive loss	(6,193		)	(5,545		)
	81,857			77,630
Less treasury stock, at cost: 1,038,087,496 shares in 2019 and 984,543,979 shares in 2018	55,950			50,929
Total Merck & Co., Inc. stockholders’ equity	25,907			26,701
Noncontrolling Interests	94			181
Total equity	26,001			26,882
	$	84,397		$	82,637

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

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Consolidated Statement of Equity

Merck & Co., Inc. and Subsidiaries

Years Ended December 31

($ in millions except per share amounts)

	Common Stock		Other Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock			Non- controlling Interests			Total
Balance January 1, 2017		$1,788	$	39,939		$	44,133		$	(5,226	)	$	(40,546	)	$	220		$	40,308
Net income attributable to Merck & Co., Inc.	—		—			2,394			—			—			—			2,394
Other comprehensive income, net of taxes	—		—			—			316			—			—			316
Cash dividends declared on common stock ($1.89 per share)	—		—			(5,177		)	—			—			—			(5,177		)
Treasury stock shares purchased	—		—			—			—			(4,014		)	—			(4,014		)
Acquisition of Vallée S.A.	—		—			—			—			—			7			7
Net income attributable to noncontrolling interests	—		—			—			—			—			24			24
Distributions attributable to noncontrolling interests	—		—			—			—			—			(18		)	(18		)
Share-based compensation plans and other	—		(37		)	—			—			766			—			729
Balance December 31, 2017	1,788		39,902			41,350			(4,910		)	(43,794		)	233			34,569
Net income attributable to Merck & Co., Inc.	—		—			6,220			—			—			—			6,220
Adoption of new accounting standards	—		—			322			(274		)	—			—			48
Other comprehensive loss, net of taxes	—		—			—			(361		)	—			—			(361		)
Cash dividends declared on common stock ($1.99 per share)	—		—			(5,313		)	—			—			—			(5,313		)
Treasury stock shares purchased	—		(1,000		)	—			—			(8,091		)	—			(9,091		)
Net loss attributable to noncontrolling interests	—		—			—			—			—			(27		)	(27		)
Distributions attributable to noncontrolling interests	—		—			—			—			—			(25		)	(25		)
Share-based compensation plans and other	—		(94		)	—			—			956			—			862
Balance December 31, 2018	1,788		38,808			42,579			(5,545		)	(50,929		)	181			26,882
Net income attributable to Merck & Co., Inc.	—		—			9,843			—			—			—			9,843
Other comprehensive loss, net of taxes	—		—			—			(648		)	—			—			(648		)
Cash dividends declared on common stock ($2.26 per share)	—		—			(5,820		)	—			—			—			(5,820		)
Treasury stock shares purchased	—		1,000			—			—			(5,780		)	—			(4,780		)
Net loss attributable to noncontrolling interests	—		—			—			—			—			(66		)	(66		)
Distributions attributable to noncontrolling interests	—		—			—			—			—			(21		)	(21		)
Share-based compensation plans and other	—		(148		)	—			—			759			—			611
Balance December 31, 2019	$	1,788	$	39,660		$	46,602		$	(6,193	)	$	(55,950	)	$	94		$	26,001

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

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Consolidated Statement of Cash Flows

Merck & Co., Inc. and Subsidiaries

Years Ended December 31

($ in millions)

	2019			2018			2017
Cash Flows from Operating Activities
Net income	$	9,777		$	6,193		$	2,418
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,652			4,519			4,676
Intangible asset impairment charges	1,040			296			646
Charge for the acquisition of Peloton Therapeutics, Inc.	993			—			—
Charge for future payments related to collaboration license options	—			650			500
Provisional charge for one-time transition tax related to the enactment of U.S. tax legislation	—			—			5,347
Deferred income taxes	(556		)	(509		)	(2,621		)
Share-based compensation	417			348			312
Other	184			978			190
Net changes in assets and liabilities:
Accounts receivable	294			(418		)	297
Inventories	(508		)	(911		)	(145		)
Trade accounts payable	399			230			254
Accrued and other current liabilities	376			(341		)	(922		)
Income taxes payable	(2,359		)	827			(3,291		)
Noncurrent liabilities	(237		)	(266		)	(123		)
Other	(32		)	(674		)	(1,087		)
Net Cash Provided by Operating Activities	13,440			10,922			6,451
Cash Flows from Investing Activities
Capital expenditures	(3,473		)	(2,615		)	(1,888		)
Purchases of securities and other investments	(3,202		)	(7,994		)	(10,739		)
Proceeds from sales of securities and other investments	8,622			15,252			15,664
Acquisition of Antelliq Corporation, net of cash acquired	(3,620		)	—			—
Acquisition of Peloton Therapeutics, Inc., net of cash acquired	(1,040		)	—			—
Other acquisitions, net of cash acquired	(294		)	(431		)	(396		)
Other	378			102			38
Net Cash (Used in) Provided by Investing Activities	(2,629		)	4,314			2,679
Cash Flows from Financing Activities
Net change in short-term borrowings	(3,710		)	5,124			(26		)
Payments on debt	—			(4,287		)	(1,103		)
Proceeds from issuance of debt	4,958			—			—
Purchases of treasury stock	(4,780		)	(9,091		)	(4,014		)
Dividends paid to stockholders	(5,695		)	(5,172		)	(5,167		)
Proceeds from exercise of stock options	361			591			499
Other	5			(325		)	(195		)
Net Cash Used in Financing Activities	(8,861		)	(13,160		)	(10,006		)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	17			(205		)	457
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	1,967			1,871			(419		)
Cash, Cash Equivalents and Restricted Cash at Beginning of Year (includes $2 million of restricted cash at January 1, 2019 included in Other Assets)	7,967			6,096			6,515
Cash, Cash Equivalents and Restricted Cash at End of Year (includes $258 million of restricted cash at December 31, 2019 included in Other Assets - see Note 6)	$	9,934		$	7,967		$	6,096

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

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Notes to Consolidated Financial Statements

Merck & Co., Inc. and Subsidiaries

($ in millions except per share amounts)

1.    Nature of Operations

Merck & Co., Inc. (Merck or the Company) is a global health care company that delivers innovative health solutions through its prescription medicines, vaccines, biologic therapies and animal health products. The Company’s operations are principally managed on a products basis and include four operating segments, which are the Pharmaceutical, Animal Health, Healthcare Services and Alliances segments. The Pharmaceutical and Animal Health segments are the only reportable segments.

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. Human health 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.

The Animal Health segment discovers, develops, manufactures and markets a wide range of veterinary pharmaceutical and vaccine products, as well as health management solutions and services, for the prevention, treatment and control of disease in all major livestock and companion animal species. The Company also offers an extensive suite of digitally connected identification, traceability and monitoring products. The Company sells its products to veterinarians, distributors and animal producers.

The 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. The Company has recently sold certain businesses in the Healthcare Services segment and is in the process of divesting the remaining businesses.

The Alliances segment primarily includes activity from the Company’s relationship with AstraZeneca LP related to sales of Nexium and Prilosec, which concluded in 2018.

Planned Spin-Off of Women’s Health, Legacy Brands and Biosimilars into New Company

In February 2020, Merck announced its intention to spin-off products from its women’s health, trusted legacy brands and biosimilars businesses into a new, yet-to-be-named, independent, publicly traded company (NewCo) through a distribution of NewCo’s publicly traded stock to Company shareholders. The distribution is expected to qualify as tax-free to the Company and its shareholders for U.S. federal income tax purposes. The legacy brands included in the transaction consist of dermatology, pain, respiratory, and select cardiovascular products including Zetia and Vytorin, as well as the rest of Merck’s diversified brands franchise. Merck’s existing research pipeline programs will continue to be owned and developed within Merck as planned. NewCo will have development capabilities initially focused on late-stage development and life-cycle management, and is expected over time to develop research capabilities in selected therapeutic areas. The spin-off is expected to be completed in the first half of 2021, subject to market and certain other conditions. Subsequent to the spin-off, the historical results of the woman’s health, legacy brands and biosimilars businesses will be reflected as discontinued operations in the Company’s consolidated financial statements.

2.    Summary of Accounting Policies

Principles of Consolidation — The consolidated financial statements include the accounts of the Company and all of its subsidiaries in which a controlling interest is maintained. Intercompany balances and transactions are eliminated. Controlling interest is determined by majority ownership interest and the absence of substantive third-party participating rights or, in the case of variable interest entities, by majority exposure to expected losses, residual returns or both. For those consolidated subsidiaries where Merck ownership is less than 100%, the outside shareholders’ interests are shown as Noncontrolling interests in equity. Investments in affiliates over which the Company has significant influence but not a controlling interest, such as interests in entities owned equally by the Company and a third party that are under shared control, are carried on the equity basis.

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Acquisitions — In a business combination, the acquisition method of accounting requires that the assets acquired and liabilities assumed be recorded as of the date of the acquisition at their respective fair values with limited exceptions. Assets acquired and liabilities assumed in a business combination that arise from contingencies are generally recognized at fair value. If fair value cannot be determined, the asset or liability is recognized if probable and reasonably estimable; if these criteria are not met, no asset or liability is recognized. 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. Accordingly, the Company may be required to value assets at fair value measures that do not reflect the Company’s intended use of those assets. Any excess of the purchase price (consideration transferred) over the estimated fair values of net assets acquired is recorded as goodwill. Transaction costs and costs to restructure the acquired company are expensed as incurred. The operating results of the acquired business are reflected in the Company’s consolidated financial statements after the date of the acquisition. If the Company determines the assets acquired do not meet the definition of a business under the acquisition method of accounting, the transaction will be accounted for as an acquisition of assets rather than a business combination and, therefore, no goodwill will be recorded. In an asset acquisition, acquired in-process research and development (IPR&D) with no alternative future use is charged to expense and contingent consideration is not recognized at the acquisition date.

Foreign Currency Translation — The net assets of international subsidiaries where the local currencies have been determined to be the functional currencies are translated into U.S. dollars using current exchange rates. The U.S. dollar effects that arise from translating the net assets of these subsidiaries at changing rates are recorded in the foreign currency translation account, which is included in Accumulated other comprehensive income (loss) (AOCI) and reflected as a separate component of equity. For those subsidiaries that operate in highly inflationary economies and for those subsidiaries where the U.S. dollar has been determined to be the functional currency, non-monetary foreign currency assets and liabilities are translated using historical rates, while monetary assets and liabilities are translated at current rates, with the U.S. dollar effects of rate changes included in Other (income) expense, net.

Cash Equivalents — Cash equivalents are comprised of certain highly liquid investments with original maturities of less than three months.

Inventories — Inventories are valued at the lower of cost or net realizable value. The cost of a substantial majority of U.S. pharmaceutical and vaccine inventories is determined using the last-in, first-out (LIFO) method for both financial reporting and tax purposes. The cost of all other inventories is determined using the first-in, first-out (FIFO) method. Inventories consist of currently marketed products, as well as certain inventories produced in preparation for product launches that are considered to have a high probability of regulatory approval. In evaluating the recoverability of inventories produced in preparation for product launches, the Company considers the likelihood that revenue will be obtained from the future sale of the related inventory together with the status of the product within the regulatory approval process.

Investments — Investments in marketable debt securities classified as available-for-sale are reported at fair value. Fair values of the Company’s investments in marketable debt securities are determined using quoted market prices in active markets for identical assets or liabilities or 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. Changes in fair value that are considered temporary are reported net of tax in Other Comprehensive Income (OCI). The Company considers available evidence in evaluating potential impairments of its investments in marketable debt securities, including the duration and extent to which fair value is less than cost. An other-than-temporary impairment has occurred if the Company does not expect to recover the entire amortized cost basis of the marketable debt security. If the Company does not intend to sell the impaired debt security, and it is not more likely than not it will be required to sell the debt security before the recovery of its amortized cost basis, the amount of the other-than-temporary impairment recognized in earnings, recorded in Other (income) expense, net, is limited to the portion attributed to credit loss. The remaining portion of the other-than-temporary impairment related to other factors is recognized in OCI. Realized gains and losses for debt securities are included in Other (income) expense, net.

Investments in publicly traded equity securities are reported at fair value determined using quoted market prices in active markets for identical assets or quoted prices for similar assets or other inputs that are observable or can be corroborated by observable market data. Changes in fair value are included in Other (income) expense, net.

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Investments in equity securities without readily determinable fair values are recorded at cost, plus or minus subsequent observable price changes in orderly transactions for identical or similar investments, minus impairments. Such adjustments are recognized in Other (income) expense, net. Realized gains and losses for equity securities are included in Other (income) expense, net.

Revenue Recognition — On January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers, and subsequent amendments (ASC 606 or new guidance), using the modified retrospective method. Comparative information for prior periods has not been restated and continues to be reported under the accounting standards in effect for those periods.

Recognition of revenue requires evidence of a contract, probable collection of sales proceeds and completion of substantially all performance obligations. Merck acts as the principal in substantially all of its customer arrangements and therefore records revenue on a gross basis. The majority of the Company’s contracts related to the Pharmaceutical and Animal Health segments have a single performance obligation - the promise to transfer goods. Shipping is considered immaterial in the context of the overall customer arrangement and damages or loss of goods in transit are rare. Therefore, shipping is not deemed a separately recognized performance obligation.

The vast majority of revenues from sales of products are recognized at a point in time when control of the goods is transferred to the customer, which the Company has determined is when title and risks and rewards of ownership transfer to the customer and the Company is entitled to payment. The Company recognizes revenue from the sales of vaccines to the Federal government for placement into vaccine stockpiles in accordance with Securities and Exchange Commission (SEC) Interpretation, Commission Guidance Regarding Accounting for Sales of Vaccines and BioTerror Countermeasures to the Federal Government for Placement into the Pediatric Vaccine Stockpile or the Strategic National Stockpile. This interpretation allows companies to recognize revenue for sales of vaccines into U.S. government stockpiles even though these sales might not meet the criteria for revenue recognition under other accounting guidance. For businesses within the Company’s Healthcare Services segment and certain services in the Animal Health segment, revenue is recognized over time, generally ratably over the contract term as services are provided. These service revenues are not material.

The nature of the Company’s business gives rise to several types of variable consideration including discounts and returns, which are estimated at the time of sale generally using the expected value method, although the most likely amount method is used for prompt pay discounts.

In the United States, sales discounts are issued to customers at the point-of-sale, through an intermediary wholesaler (known as chargebacks), or in the form of rebates. Additionally, sales are generally made with a limited right of return under certain conditions. Revenues are recorded net of provisions for sales discounts and returns, which are established at the time of sale. In addition, revenues are recorded net of time value of money discounts if collection of accounts receivable is expected to be in excess of one year.

The U.S. provision for aggregate customer discounts covering chargebacks and rebates was $11.8 billion in 2019, $10.7 billion in 2018 and $10.7 billion in 2017. Chargebacks are discounts that occur when a contracted customer purchases through an intermediary wholesaler. The contracted customer generally purchases product from the wholesaler at its contracted price plus a mark-up. The wholesaler, in turn, charges the Company back for the difference between the price initially paid by the wholesaler and the contract price paid to the wholesaler by the customer. The provision for chargebacks is based on expected sell-through levels by the Company’s wholesale customers to contracted customers, as well as estimated wholesaler inventory levels. Rebates are amounts 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. The provision for rebates is based on expected patient usage, as well as inventory levels in the distribution channel to determine the contractual obligation to the benefit providers. The Company uses historical customer segment utilization mix, sales forecasts, changes to product mix and price, inventory levels in the distribution channel, government pricing calculations and prior payment history in order to estimate the expected provision. Amounts accrued for aggregate customer discounts are evaluated on a quarterly basis through comparison of information provided by the wholesalers, health maintenance organizations, pharmacy benefit managers, federal and state agencies, and other customers to the amounts accrued. The accrued balances relative to the provisions for chargebacks and rebates included in Accounts

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receivable and Accrued and other current liabilities were $233 million and $2.2 billion, respectively, at December 31, 2019 and were $245 million and $2.4 billion, respectively, at December 31, 2018.

Outside of the United States, variable consideration in the form of discounts and rebates are a combination of commercially-driven discounts in highly competitive product classes, discounts required to gain or maintain reimbursement, or legislatively mandated rebates. In certain European countries, legislatively mandated rebates are calculated based on an estimate of the government’s total unbudgeted spending and the Company’s specific payback obligation. Rebates may also be required based on specific product sales thresholds. The Company applies an estimated factor against its actual invoiced sales to represent the expected level of future discount or rebate obligations associated with the sale.

The Company maintains a returns policy that allows its U.S. pharmaceutical customers to return product within a specified period prior to and subsequent to the expiration date (generally, three to six months before and 12 months after product expiration). The estimate of the provision for returns is based upon historical experience with actual returns. Additionally, the Company considers factors such as levels of inventory in the distribution channel, product dating and expiration period, whether products have been discontinued, entrance in the market of generic competition, changes in formularies or launch of over-the-counter products, among others. Outside of the United States, returns are only allowed in certain countries on a limited basis.

Merck’s payment terms for U.S. pharmaceutical customers are typically 36 days from receipt of invoice and for U.S. animal health customers are typically 30 days from receipt of invoice; however, certain products, including Keytruda, have longer payment terms up to 90 days. Outside of the United States, payment terms are typically 30 days to 90 days, although certain markets have longer payment terms.

Depreciation — Depreciation is provided over the estimated useful lives of the assets, principally using the straight-line method. For tax purposes, accelerated tax methods are used. The estimated useful lives primarily range from 25 to 45 years for Buildings, and from 3 to 15 years for Machinery, equipment and office furnishings. Depreciation expense was $1.7 billion in 2019, $1.4 billion in 2018 and $1.5 billion in 2017.

Advertising and Promotion Costs — Advertising and promotion costs are expensed as incurred. The Company recorded advertising and promotion expenses of $2.1 billion, $2.1 billion and $2.2 billion in 2019, 2018 and 2017, respectively.

Software Capitalization — The Company capitalizes certain costs incurred in connection with obtaining or developing internal-use software including external direct costs of material and services, and payroll costs for employees directly involved with the software development. These costs are included in Property, plant and equipment. In addition, the Company capitalizes certain costs incurred to implement a cloud computing arrangement that is considered a service agreement, which are included in Other Assets. Capitalized software costs are amortized beginning when the software project is substantially complete and the asset is ready for its intended use. Capitalized software costs associated with projects that are being amortized over 6 to 10 years (including the Company’s on-going multi-year implementation of an enterprise-wide resource planning system) were $548 million and $439 million, net of accumulated amortization at December 31, 2019 and 2018, respectively. All other capitalized software costs are being amortized over periods ranging from 3 to 5 years. Costs incurred during the preliminary project stage and post-implementation stage, as well as maintenance and training costs, are expensed as incurred.

Goodwill — Goodwill represents the excess of the consideration transferred over the fair value of net assets of businesses acquired. Goodwill is assigned to reporting units and evaluated for impairment on at least an annual basis, or more frequently if impairment indicators exist, by first assessing qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the Company concludes it is more likely than not that the fair value of a reporting unit is less than its carrying amount, a quantitative fair value test is performed. If the carrying value of a reporting unit is greater than its fair value, a goodwill impairment charge will be recorded for the difference (up to the carrying value of goodwill).

Acquired Intangibles — Acquired intangibles include products and product rights, licenses, trade names and patents, which are initially recorded at fair value, assigned an estimated useful life, and amortized primarily on a straight-line basis over their estimated useful lives ranging from 2 to 24 years (see Note 8). The Company periodically evaluates whether current facts or circumstances indicate that the carrying values of its acquired intangibles may not

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be recoverable. If such circumstances are determined to exist, an estimate of the undiscounted future cash flows of these assets, or appropriate asset groupings, is compared to the carrying value to determine whether an impairment exists. If the asset is determined to be impaired, the loss is measured based on the difference between the carrying value of the intangible asset and its fair value, which is determined based on the net present value of estimated future cash flows.

Acquired In-Process Research and Development — IPR&D that the Company acquires in conjunction with the acquisition of a business represents the fair value assigned to incomplete research projects which, at the time of acquisition, have not reached technological feasibility. The amounts are capitalized and are accounted for as indefinite-lived intangible assets, subject to impairment testing until completion or abandonment of the projects. Upon successful completion of each project, Merck will make a determination as to the then-useful life of the intangible asset, generally determined by the period in which the substantial majority of the cash flows are expected to be generated, and begin amortization. The Company evaluates IPR&D for impairment at least annually, or more frequently if impairment indicators exist, by performing a quantitative test that compares the fair value of the IPR&D intangible asset with its carrying value. If the fair value is less than the carrying amount, an impairment loss is recognized in operating results.

Contingent Consideration — Certain of the Company’s acquisitions involve the potential for future payment of consideration that is contingent upon the achievement of performance milestones, including product development milestones and royalty payments on future product sales. If the transaction is accounted for as an acquisition of a business, the fair value of contingent consideration liabilities is determined at the acquisition date using unobservable inputs. These inputs include the estimated amount and timing of projected cash flows, the probability of success (achievement of the contingent event) and the risk-adjusted discount rate used to present value the probability-weighted cash flows. Subsequent to the acquisition date, at each reporting period until the contingency is resolved, the contingent consideration liability is remeasured at current fair value with changes (either expense or income) recorded in earnings. Significant events that increase or decrease the probability of achieving development and regulatory milestones or that increase or decrease projected cash flows will result in corresponding increases or decreases in the fair values of the related contingent consideration obligations. If the transaction is accounted for as an acquisition of an asset rather than a business, contingent consideration is not recognized at the acquisition date. In these instances, product development milestones are recognized upon achievement and sales-based milestones are recognized when the milestone is deemed probable by the Company of being achieved.

Research and Development — Research and development is expensed as incurred. Nonrefundable advance payments for goods and services that will be used in future research and development activities are expensed when the activity has been performed or when the goods have been received rather than when the payment is made. Research and development expenses include restructuring costs and IPR&D impairment charges. In addition, research and development expenses include expense or income related to changes in the estimated fair value measurement of liabilities for contingent consideration. Research and development expenses also include upfront and milestone payments related to asset acquisitions and licensing transactions involving clinical development programs that have not yet received regulatory approval.

Collaborative Arrangements — Merck has entered into collaborative arrangements that provide the Company with varying rights to develop, produce and market products together with its collaborative partners. When Merck is the principal on sales transactions with third parties, the Company recognizes sales, cost of sales and selling, general and administrative expenses on a gross basis. Profit sharing amounts it pays to its collaborative partners are recorded within Cost of sales. When the collaborative partner is the principal on sales transactions with third parties, the Company records profit sharing amounts received from its collaborative partners as alliance revenue (within Sales). Alliance revenue is recorded net of cost of sales and includes an adjustment to share commercialization costs between the partners in accordance with the collaboration agreement. The adjustment is determined by comparing the commercialization costs Merck has incurred directly and reported within Selling, general and administrative expenses with the costs the collaborative partner has incurred. Research and development costs Merck incurs related to collaborations are recorded within Research and development expenses. Cost reimbursements to the collaborative partner or payments received from the collaborative partner to share these costs pursuant to the terms of the collaboration agreements are recorded as increases or decreases to Research and development expenses.

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In addition, the terms of the collaboration agreements may require the Company to make payments based upon the achievement of certain developmental, regulatory approval or commercial milestones. Upfront and milestone payments payable by Merck to collaborative partners prior to regulatory approval are expensed as incurred and included in Research and development expenses. Payments due to collaborative partners upon or subsequent to regulatory approval are capitalized and amortized over the estimated useful life of the corresponding intangible asset to Cost of sales provided that future cash flows support the amounts capitalized. Sales-based milestones payable by Merck to collaborative partners are accrued and capitalized, subject to cumulative amortization catch-up, when probable of being achieved. The amortization catch-up is calculated either from the time of the first regulatory approval for indications that were unapproved at the time the collaboration was formed, or from time of the formation of the collaboration for approved products. The related intangible asset that is recognized is amortized to Cost of sales over its remaining useful life, subject to impairment testing.

Share-Based Compensation — The Company expenses all share-based payments to employees over the requisite service period based on the grant-date fair value of the awards.

Restructuring Costs — The Company records liabilities for costs associated with exit or disposal activities in the period in which the liability is incurred. In accordance with existing benefit arrangements, employee termination costs are accrued when the restructuring actions are probable and estimable. When accruing these costs, the Company will recognize the amount within a range of costs that is the best estimate within the range. When no amount within the range is a better estimate than any other amount, the Company recognizes the minimum amount within the range. Costs for one-time termination benefits in which the employee is required to render service until termination in order to receive the benefits are recognized ratably over the future service period.

Contingencies and Legal Defense Costs — The Company records accruals for contingencies and legal defense costs expected to be incurred in connection with a loss contingency when it is probable that a liability has been incurred and the amount can be reasonably estimated.

Taxes on Income — Deferred taxes are recognized for the future tax effects of temporary differences between financial and income tax reporting based on enacted tax laws and rates. The Company evaluates tax positions to determine whether the benefits of tax positions are more likely than not of being sustained upon audit based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained upon audit, the Company recognizes the largest amount of the benefit that is greater than 50% likely of being realized upon ultimate settlement in the financial statements. For tax positions that are not more likely than not of being sustained upon audit, the Company does not recognize any portion of the benefit in the financial statements. The Company recognizes interest and penalties associated with uncertain tax positions as a component of Taxes on income in the Consolidated Statement of Income. The Company accounts for the tax effects of the tax on global intangible low-taxed income (GILTI) of certain foreign subsidiaries in the income tax provision in the period the tax arises.

Use of Estimates — The consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States (GAAP) and, accordingly, include certain amounts that are based on management’s best estimates and judgments. Estimates are used when accounting for amounts recorded in connection with acquisitions, including initial fair value determinations of assets and liabilities, primarily IPR&D, other intangible assets and contingent consideration, as well as subsequent fair value measurements. Additionally, estimates are used in determining such items as provisions for sales discounts and returns, depreciable and amortizable lives, recoverability of inventories, including those produced in preparation for product launches, amounts recorded for contingencies, environmental liabilities, accruals for contingent sales-based milestone payments and other reserves, pension and other postretirement benefit plan assumptions, share-based compensation assumptions, restructuring costs, impairments of long-lived assets (including intangible assets and goodwill) and investments, and taxes on income. Because of the uncertainty inherent in such estimates, actual results may differ from these estimates.

Reclassifications — Certain reclassifications have been made to prior year amounts to conform to the current year presentation.

Recently Adopted Accounting Standards — In February 2016, the Financial Accounting Standards Board (FASB) issued new accounting guidance for the accounting and reporting of leases (ASU 2016-02) and subsequently issued several updates to the new guidance (ASC 842 or new leasing guidance). The new leasing guidance requires

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that lessees recognize a right-of-use asset and a lease liability for each of its leases (other than leases that meet the definition of a short-term lease). Leases are classified as either operating or finance. Operating leases result in straight-line expense in the income statement (similar to previous operating leases), while finance leases result in more expense being recognized in the earlier years of the lease term (similar to previous capital leases). The Company adopted the new standard on January 1, 2019 using a modified retrospective approach. Merck elected the transition method that allows for application of the standard at the adoption date rather than at the beginning of the earliest comparative period presented in the financial statements. The Company also elected available practical expedients. Upon adoption, the Company recognized $1.1 billion of additional assets and related liabilities on its consolidated balance sheet (see Note 9). The adoption of the new leasing guidance did not impact the Company’s consolidated statements of income or of cash flows.

In April 2018, the FASB issued new guidance on the accounting for costs incurred to implement a cloud computing arrangement that is considered a service arrangement. The new guidance requires the capitalization of such costs, aligning it with the accounting for costs associated with developing or obtaining internal-use software. The Company adopted the new standard in the third quarter of 2019 using prospective application for eligible costs, which were immaterial.

In August 2018, the FASB issued new guidance modifying the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The new guidance removes disclosures that no longer are considered cost beneficial, clarifies the specific requirements of certain disclosures, and adds disclosure requirements identified as relevant. The Company elected to early adopt the new guidance in 2019 on a retrospective basis resulting in minor changes to its employee benefit plan disclosures (see Note 13).

Also, in August 2018, the FASB issued new guidance on fair value measurements that adds, removes, and modifies certain disclosure requirements. The Company elected to early adopt the new guidance in 2019 resulting in minor changes to its fair value disclosures (see Note 6).

Recently Issued Accounting Standards Not Yet Adopted — In June 2016, the FASB issued new guidance on the accounting for credit losses on financial instruments. The new 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 Company adopted the new guidance effective January 1, 2020. There was no impact to the Company’s consolidated financial statements upon adoption.

In November 2018, the FASB issued new guidance for collaborative arrangements intended to reduce diversity in practice by clarifying whether certain transactions between collaborative arrangement participants should be accounted for under revenue recognition guidance (ASC 606). The Company adopted the new guidance effective January 1, 2020, which will result in minor changes to the footnote presentation of information related to the Company’s collaborative arrangements.

In December 2019, the FASB issued amended guidance on the accounting and reporting of income taxes. The guidance is intended to simplify the accounting for income taxes by removing exceptions related to certain intraperiod tax allocations and deferred tax liabilities; clarifying guidance primarily related to evaluating the step-up tax basis for goodwill in a business combination; and reflecting enacted changes in tax laws or rates in the annual effective tax rate. The amended guidance is effective for interim and annual periods in 2021. Early adoption is permitted. The application of the amendments in the new guidance are to be applied on a retrospective basis, on a modified retrospective basis through a cumulative-effect adjustment to retained earnings or prospectively, depending on the amendment. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In January 2020, the FASB issued new guidance intended to clarify certain interactions between accounting standards related to equity securities, equity method investments and certain derivatives. The guidance addresses accounting for the transition into and out of the equity method of accounting and measuring certain purchased options and forward contracts to acquire investments. The new guidance is effective for interim and annual periods in 2021 and is to be applied prospectively. Early adoption is permitted. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

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3.    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 arrangements, 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.

Recently Completed Transaction

In January 2020, Merck acquired ArQule, Inc. (ArQule), a publicly traded biopharmaceutical company focused on kinase inhibitor discovery and development for the treatment of patients with cancer and other diseases for $2.7 billion. ArQule’s lead investigational candidate, MK-1026 (formerly ARQ 531), is a novel, oral Bruton’s tyrosine kinase (BTK) inhibitor currently in a Phase 2 dose expansion study for the treatment of B-cell malignancies. The Company is in the process of determining the preliminary fair value of assets acquired, liabilities assumed and total consideration transferred in this transaction, which will be accounted for as an acquisition of a business.

2019 Transactions

In July 2019, Merck acquired Peloton Therapeutics, Inc. (Peloton), a clinical-stage biopharmaceutical company focused on the development of novel small molecule therapeutic candidates targeting hypoxia-inducible factor-2α (HIF-2α) for the treatment of patients with cancer and other non-oncology diseases. Peloton’s lead candidate, MK-6482 (formerly PT2977), is a novel oral HIF-2α inhibitor in late-stage development for renal cell carcinoma. Merck made an upfront payment of $1.2 billion in cash; additionally, former Peloton shareholders will be eligible to receive $50 million upon U.S. regulatory approval, $50 million upon first commercial sale in the United States, and up to $1.05 billion of sales-based milestones. The transaction was accounted for as an acquisition of an asset. Merck recorded cash of $157 million, deferred tax liabilities of $52 million, and other net liabilities of $4 million at the acquisition date and Research and development expenses of $993 million in 2019 related to the transaction.

On April 1, 2019, Merck acquired Antelliq Corporation (Antelliq), a leader in digital animal identification, traceability and monitoring solutions. These solutions help veterinarians, farmers and pet owners gather critical data to improve management, health and well-being of livestock and pets. Merck paid $2.3 billion to acquire all outstanding shares of Antelliq and spent $1.3 billion to repay Antelliq’s debt. The transaction was accounted for as an acquisition of a business.

The estimated fair value of assets acquired and liabilities assumed from Antelliq is as follows:

($ in millions)	April 1, 2019
Cash and cash equivalents	$	31
Accounts receivable	73
Inventories	95
Property, plant and equipment	62
Identifiable intangible assets (useful lives ranging from 18-24 years) (1)	2,689
Deferred income tax liabilities	(520		)
Other assets and liabilities, net	(81		)
Total identifiable net assets	2,349
Goodwill (2)	1,302
Consideration transferred	$	3,651

⁽¹⁾  The estimated fair values of identifiable intangible assets relate primarily to trade names and were determined using an income approach. The future net cash flows were discounted to present value utilizing a discount rate of 11.5%. Actual cash flows are likely to be different than those assumed.

⁽²⁾  The goodwill recognized is largely attributable to anticipated synergies expected to arise after the acquisition and was allocated to the Animal Health segment. The goodwill is not deductible for tax purposes.

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The Company’s results for 2019 include eight months of activity for Antelliq. The Company incurred $47 million of transaction costs directly related to the acquisition of Antelliq, consisting largely of advisory fees, which are reflected in Selling, general and administrative expenses in 2019.

Also in April 2019, Merck acquired Immune Design, a late-stage immunotherapy company employing next-generation in vivo approaches to enable the body’s immune system to fight disease, for $301 million in cash. The transaction was accounted for as an acquisition of a business. Merck recognized intangible assets for IPR&D of $156 million, cash of $83 million and other net assets of $42 million. The excess of the consideration transferred over the fair value of net assets acquired of $20 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. Actual cash flows are likely to be different than those assumed.

2018 Transactions

In 2018, the Company recorded an aggregate charge of $423 million within Cost of sales in conjunction with the termination of a collaboration agreement entered into in 2014 with Samsung Bioepis Co., Ltd. (Samsung) for insulin glargine. The charge reflects a termination payment of $155 million, which represents the reimbursement of all fees previously paid by Samsung to Merck under the agreement, plus interest, as well as the release of Merck’s ongoing obligations under the agreement. The charge also included fixed asset abandonment charges of $137 million, inventory write-offs of $122 million, as well as other related costs of $9 million. The termination of this agreement has no impact on the Company’s other collaboration with Samsung.

In June 2018, Merck acquired Viralytics Limited (Viralytics), an Australian publicly traded company focused on oncolytic immunotherapy treatments for a range of cancers, for AUD 502 million ($378 million). The transaction provided Merck with full rights to V937 (formerly CVA21), Viralytics’s investigational oncolytic immunotherapy. V937 is based on Viralytics’s proprietary formulation of an oncolytic virus (Coxsackievirus Type A21) that has been shown to preferentially infect and kill cancer cells. V937 is currently being evaluated in multiple clinical trials, both as an intratumoral and intravenous agent, including in combination with Keytruda. Under a previous agreement between Merck and Viralytics, a study is investigating the use of the Keytruda and V937 combination in melanoma, prostate, lung and bladder cancers. The transaction was accounted for as an acquisition of an asset. Merck recorded net assets of $34 million (primarily cash) at the acquisition date and Research and development expenses of $344 million in 2018 related to the transaction. There are no future contingent payments associated with the acquisition.

In March 2018, Merck and Eisai Co., Ltd. (Eisai) entered into a strategic collaboration for the worldwide co-development and co-commercialization of Lenvima, an orally available tyrosine kinase inhibitor discovered by Eisai (see Note 4).

2017 Transactions

In October 2017, Merck acquired Rigontec GmbH (Rigontec), a leader in accessing the retinoic acid-inducible gene I pathway, part of the innate immune system, as a novel and distinct approach in cancer immunotherapy to induce both immediate and long-term anti-tumor immunity. Rigontec’s lead candidate, MK-4621 (formerly RGT100), is in development for the treatment in patients with various tumors. Under the terms of the agreement, Merck made an upfront cash payment of €119 million ($140 million) and may make additional contingent payments of up to €349 million (of which €184 million are related to the achievement of research milestones and regulatory approvals and €165 million are related to the achievement of commercial targets). The transaction was accounted for as an acquisition of an asset and the upfront payment is reflected within Research and development expenses in 2017.

In July 2017, Merck and AstraZeneca PLC (AstraZeneca) entered into a global strategic oncology collaboration to co-develop and co-commercialize AstraZeneca’s Lynparza for multiple cancer types (see Note 4).

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 $102 million, other net assets of $32 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

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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 $156 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. 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 the fourth quarter of 2017, Merck acquired an additional 4.5% interest in Vallée for $18 million, which reduced the noncontrolling interest related to Vallée.

Remicade/Simponi

In 1998, a subsidiary of Schering-Plough entered into a licensing agreement with Centocor Ortho Biotech Inc. (Centocor), a Johnson & Johnson (J&J) company, to market Remicade, which is prescribed for the treatment of inflammatory diseases. In 2005, Schering-Plough’s subsidiary exercised an option under its contract with Centocor for license rights to develop and commercialize Simponi, a fully human monoclonal antibody. The Company has marketing rights to both products throughout Europe, Russia and Turkey. Remicade lost market exclusivity in major European markets in 2015 and the Company no longer has market exclusivity in any of its marketing territories. The Company continues to have market exclusivity for Simponi in all of its marketing territories. All profits derived from Merck’s distribution of the two products in these countries are equally divided between Merck and J&J.

4.    Collaborative Arrangements

Merck has entered into collaborative arrangements that provide the Company with varying rights to develop, produce and market products together with its collaborative partners. Both parties in these arrangements are active participants and exposed to significant risks and rewards dependent on the commercial success of the activities of the collaboration. Merck’s more significant collaborative arrangements are discussed below.

AstraZeneca

In July 2017, Merck and AstraZeneca PLC (AstraZeneca) entered into a global strategic oncology collaboration to co-develop and co-commercialize AstraZeneca’s Lynparza for multiple cancer types. Lynparza is an oral poly (ADP-ribose) polymerase (PARP) inhibitor currently approved for certain types of ovarian and breast cancer. The companies are jointly developing and commercializing Lynparza, both as monotherapy and in combination trials with other potential medicines. Independently, Merck and AstraZeneca will develop and commercialize Lynparza in combinations with their respective PD-1 and PD-L1 medicines, Keytruda and Imfinzi. The companies will also jointly develop and commercialize AstraZeneca’s selumetinib, an oral, potent, selective inhibitor of MEK, part of the mitogen-activated protein kinase (MAPK) pathway, currently being developed for multiple indications. Under the terms of the agreement, AstraZeneca and Merck will share the development and commercialization costs for Lynparza and selumetinib monotherapy and non-PD-L1/PD-1 combination therapy opportunities.

Gross profits from Lynparza and selumetinib product sales generated through monotherapies or combination therapies are shared equally. Merck will fund all development and commercialization costs of Keytruda in combination with Lynparza or selumetinib. AstraZeneca will fund all development and commercialization costs of Imfinzi in combination with Lynparza or selumetinib. AstraZeneca is the principal on Lynparza sales transactions. Merck records its share of Lynparza product sales, net of cost of sales and commercialization costs, as alliance revenue and its share of development costs associated with the collaboration as part of Research and development expenses. Reimbursements received from AstraZeneca for research and development expenses are recognized as reductions to Research and development costs.

As part of the agreement, Merck made an upfront payment to AstraZeneca of $1.6 billion in 2017 and made payments of $750 million over a multi-year period for certain license options (of which $250 million was paid in December 2017, $400 million was paid in December 2018 and $100 million was paid in December 2019). The Company recorded an aggregate charge of $2.35 billion in Research and development expenses in 2017 related to the upfront payment and license option payments. In addition, the agreement provides for additional contingent payments from Merck to AstraZeneca related to the successful achievement of sales-based and regulatory milestones.

In 2019, Merck determined it was probable that annual sales of Lynparza in the future would trigger a $300 million sales-based milestone payment from Merck to AstraZeneca. Accordingly, in 2019, Merck recorded a $300

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million liability and a corresponding increase to the intangible asset related to Lynparza. Prior to 2019, Merck accrued sales-based milestone payments aggregating $700 million, of which $200 million and $250 million was paid to AstraZeneca in 2019 and 2018, respectively, and the remainder of $250 million was paid in January 2020. Potential future sales-based milestone payments of $3.1 billion have not yet been accrued as they are not deemed by the Company to be probable at this time.

In 2019, Lynparza received regulatory approval in the European Union (EU) both as a monotherapy for the treatment of certain adult patients with advanced breast cancer and as a monotherapy for the maintenance treatment of certain adult patients with BRCA-mutated advanced ovarian cancer. Each of these approvals triggered a $30 million capitalized milestone payment from Merck to AstraZeneca. In 2018, Lynparza received regulatory approvals triggering capitalized milestone payments of $140 million in the aggregate from Merck to AstraZeneca. Potential future regulatory milestone payments of $1.7 billion remain under the agreement.

The intangible asset balance related to Lynparza (which includes capitalized sales-based and regulatory milestone payments) was $955 million at December 31, 2019 and is included in Other Intangibles, Net on the Consolidated Balance Sheet. The amount is being amortized over its estimated useful life through 2028 as supported by projected future cash flows, subject to impairment testing.

Summarized financial information related to this collaboration is as follows:

Years Ended December 31	2019		2018		2017
Alliance revenue	$	444	$	187	$	20
Cost of sales (1)	148		93		4
Selling, general and administrative	138		48		1
Research and development (2)	168		152		2,419
December 31	2019		2018
Receivables from AstraZeneca included in Other current assets	$	128	$	52
Payables to AstraZeneca included in Accrued and other current liabilities (3)	577		405
Payables to AstraZeneca included Other Noncurrent Liabilities (3)	—		250

⁽¹⁾ Represents amortization of capitalized milestone payments.

⁽²⁾ Amount for 2017 includes $2.35 billion related to the upfront payment and license option payments.

⁽³⁾ Includes accrued milestone payments.

Eisai

In March 2018, Merck and Eisai announced a strategic collaboration for the worldwide co-development and co-commercialization of Lenvima, an orally available tyrosine kinase inhibitor discovered by Eisai. Under the agreement, Merck and Eisai will develop and commercialize Lenvima jointly, both as monotherapy and in combination with Merck’s Keytruda. Eisai records Lenvima product sales globally (Eisai is the principal on Lenvima sales transactions), and Merck and Eisai share gross profits equally. Merck records its share of Lenvima product sales, net of cost of sales and commercialization costs, as alliance revenue. Expenses incurred during co-development, including for studies evaluating Lenvima as monotherapy, are shared equally by the two companies and reflected in Research and development expenses.

Under the agreement, Merck made an upfront payment to Eisai of $750 million and will make payments of up to $650 million for certain option rights through 2021 (of which $325 million was paid in March 2019, $200 million is expected to be paid in March 2020 and $125 million is expected to be paid in March 2021). The Company recorded an aggregate charge of $1.4 billion in Research and development expenses in 2018 related to the upfront payment and future option payments. In addition, the agreement provides for additional contingent payments from Merck to Eisai related to the successful achievement of sales-based and regulatory milestones.

In 2019, Merck determined it was probable that annual sales of Lenvima in the future would trigger sales-based milestone payments from Merck to Eisai aggregating $682 million. Accordingly, in 2019, Merck recorded $682 million of liabilities and corresponding increases to the intangible asset related to Lenvima. In 2018, Merck accrued sales-based milestone payments aggregating $268 million related to Lenvima. Of these amounts, $50 million was paid

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to Eisai in 2019 and an additional $150 million was paid in January 2020. Potential future sales-based milestone payments of $3.0 billion have not yet been accrued as they are not deemed by the Company to be probable at this time.

In 2018, Lenvima received regulatory approvals triggering capitalized milestone payments of $250 million in the aggregate from Merck to Eisai. Potential future regulatory milestone payments of $135 million remain under the agreement.

The intangible asset balance related to Lenvima (which includes capitalized sales-based and regulatory milestone payments) was $956 million at December 31, 2019 and is included in Other Intangibles, Net on the Consolidated Balance Sheet. The amount is being amortized over its estimated useful life through 2026 as supported by projected future cash flows, subject to impairment testing.

Summarized financial information related to this collaboration is as follows:

Years Ended December 31	2019		2018
Alliance revenue	$	404	$	149
Cost of sales (1)	206		39
Selling, general and administrative	80		13
Research and development (2)	189		1,489
December 31	2019		2018
Receivables from Eisai included in Other current assets	$	150	$	71
Payables to Eisai included in Accrued and other current liabilities (3)	700		375
Payables to Eisai included in Other Noncurrent Liabilities (3)	525		543

⁽¹⁾ Represents amortization of capitalized milestone payments.

⁽²⁾ Amount for 2018 includes $1.4 billion related to the upfront payment and option payments.

⁽³⁾ Includes accrued milestone and future option payments.

Bayer AG

In 2014, the Company entered into a worldwide clinical development collaboration with Bayer AG (Bayer) to market and develop soluble guanylate cyclase (sGC) modulators including Bayer’s Adempas, which is approved to treat pulmonary arterial hypertension and chronic thromboembolic pulmonary hypertension. The two companies have implemented a joint development and commercialization strategy. The collaboration also includes clinical development of Bayer’s vericiguat, which is in Phase 3 trials for worsening heart failure, as well as opt-in rights for other early-stage sGC compounds in development by Bayer. Merck in turn made available its early-stage sGC compounds under similar terms. Under the agreement, Bayer leads commercialization of Adempas in the Americas, while Merck leads commercialization in the rest of the world. For vericiguat and other potential opt-in products, Bayer will lead commercialization in the rest of world and Merck will lead in the Americas. For all products and candidates included in the agreement, both companies will share in development costs and profits on sales and will have the right to co-promote in territories where they are not the lead. Revenue from Adempas 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. In addition, the agreement provides for additional contingent payments from Merck to Bayer related to the successful achievement of sales-based milestones.

In 2018, Merck determined it was probable that annual worldwide sales of Adempas in the future would trigger a $375 million sales-based milestone payment from Merck to Bayer. Accordingly, Merck recorded a $375 million liability and a corresponding increase to the intangible asset related to Adempas. In 2018, the Company made a $350 million milestone payment to Bayer, which was accrued for in 2016 when Merck deemed the payment to be probable. There is an additional $400 million potential future sales-based milestone payment that has not yet been accrued as it is not deemed by the Company to be probable at this time.

The intangible asset balance related to Adempas (which includes the acquired intangible asset balance, as well as capitalized sales-based milestone payments) was $883 million at December 31, 2019 and is included in Other Intangibles, Net on the Consolidated Balance Sheet. The amount is being amortized over its estimated useful life through 2027 as supported by projected future cash flows, subject to impairment testing.

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Summarized financial information related to this collaboration is as follows:

Years Ended December 31	2019		2018		2017
Net product sales recorded by Merck	$	215	$	190	$	149
Merck’s profit share from sales in Bayer’s marketing territories	204		139		151
Total sales	419		329		300
Cost of sales (1)	113		216		99
Selling, general and administrative	41		35		27
Research and development	126		127		101
December 31	2019		2018
Receivables from Bayer included in Other current assets	$	49	$	32
Payables to Bayer included in Other Noncurrent Liabilities (2)	375		375

⁽¹⁾ Includes amortization of intangible assets.

⁽²⁾ Represents accrued milestone payment.

5.    Restructuring

In early 2019, Merck approved a new global restructuring program (Restructuring Program) as part of a worldwide initiative focused on further optimizing the Company’s manufacturing and supply network, as well as reducing its global real estate footprint. This program is a continuation of the Company’s plant rationalization, builds on prior restructuring programs and does not include any actions associated with the planned spin-off of NewCo. As the Company continues to evaluate its global footprint and overall operating model, it has subsequently identified additional actions under the Restructuring Program, and could identify further actions over time. The actions currently contemplated under the Restructuring Program are expected to be substantially completed by the end of 2023, with the cumulative pretax costs to be incurred by the Company to implement the program now estimated to be approximately $2.5 billion. The Company estimates that approximately 60% of the cumulative pretax costs will result in cash outlays, primarily related to employee separation expense and facility shut-down costs. Approximately 40% of the cumulative pretax costs will be non-cash, relating primarily to the accelerated depreciation of facilities to be closed or divested. The Company expects to record charges of approximately $800 million in 2020 related to the Restructuring Program. Actions under previous global restructuring programs have been substantially completed.

The Company recorded total pretax costs of $927 million in 2019, $658 million in 2018 and $927 million in 2017 related to restructuring program activities. For segment reporting, restructuring charges are unallocated expenses.

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The following table summarizes the charges related to restructuring program activities by type of cost:

	Separation Costs		Accelerated Depreciation			Other		Total
Year Ended December 31, 2019
Cost of sales	$	—	$	198		$	53	$	251
Selling, general and administrative	—		33			1		34
Research and development	—		2			2		4
Restructuring costs	572		—			66		638
	$	572	$	233		$	122	$	927
Year Ended December 31, 2018
Cost of sales	$	—	$	10		$	11	$	21
Selling, general and administrative	—		2			1		3
Research and development	—		(13		)	15		2
Restructuring costs	473		—			159		632
	$	473	$	(1	)	$	186	$	658
Year Ended December 31, 2017
Cost of sales	$	—	$	52		$	86	$	138
Selling, general and administrative	—		2			—		2
Research and development	—		6			5		11
Restructuring costs	552		—			224		776
	$	552	$	60		$	315	$	927

Separation costs are associated with actual headcount reductions, as well as those headcount reductions which were probable and could be reasonably estimated.

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 the sites have and will continue to operate up through the respective closure dates and, since future undiscounted cash flows are 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 2019, 2018 and 2017 includes asset abandonment, facility shut-down and other related costs, as well as pretax gains and losses resulting from the sales of facilities and related assets. Additionally, other activity includes certain employee-related costs associated with pension and other postretirement benefit plans (see Note 13) and share-based compensation.

The following table summarizes the charges and spending relating to restructuring program activities:

	Separation Costs			Accelerated Depreciation			Other			Total
Restructuring reserves January 1, 2018	$	619		$	—		$	128		$	747
Expenses	473			(1		)	186			658
(Payments) receipts, net	(649		)	—			(238		)	(887		)
Non-cash activity	—			1			15			16
Restructuring reserves December 31, 2018	443			—			91			534
Expenses	572			233			122			927
(Payments) receipts, net	(325		)	—			(136		)	(461		)
Non-cash activity	—			(233		)	(8		)	(241		)
Restructuring reserves December 31, 2019 (1)	$	690		$	—		$	69		$	759

⁽¹⁾  The remaining cash outlays are expected to be substantially completed by the end of 2023.

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6.    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 changes 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, Japanese yen and Chinese renminbi. 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 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 Consolidated Balance Sheet. Changes in the fair value of derivative contracts are recorded each period in either current earnings or 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 unrealized gains or losses on these contracts is recorded in AOCI and reclassified into Sales when the hedged anticipated revenue is recognized. 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 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 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.

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The Company also uses forward exchange contracts to hedge a portion of 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 unrealized gains or losses on these contracts are recorded in foreign currency translation adjustment within OCI, and remain in AOCI until either the sale or complete or substantially complete liquidation of the subsidiary. The Company excludes certain portions of the change in fair value of its derivative instruments from the assessment of hedge effectiveness (excluded component). Changes in fair value of the excluded components are recognized in OCI. The Company recognizes in earnings the initial value of the excluded component on a straight-line basis over the life of the derivative instrument, rather than using the mark-to-market approach. The cash flows from these contracts are reported as investing activities in the 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.

The effects of the Company’s net investment hedges on OCI and the Consolidated Statement of Income are shown below:

	Amount of Pretax (Gain) Loss Recognized in Other Comprehensive Income (1)								Amount of Pretax (Gain) Loss Recognized in Other (income) expense, net for Amounts Excluded from Effectiveness Testing
Years Ended December 31	2019			2018			2017		2019			2018			2017
Net Investment Hedging Relationships
Foreign exchange contracts	$	(10	)	$	(18	)	$	—	$	(31	)	$	(11	)	$	—
Euro-denominated notes	(75		)	(183		)	520		—			—			—

⁽¹⁾ No amounts were reclassified from AOCI into income related to the sale of a subsidiary.

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 December 31, 2019, the Company was a party to 19 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.

	2019
Debt Instrument	Par Value of Debt		Number of Interest Rate Swaps Held	Total Swap Notional Amount
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 along with the offsetting fair value changes in the swap contracts. The cash flows from these contracts are reported as operating activities in the Consolidated Statement of Cash Flows.

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The table below presents the location of amounts recorded on the Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges as of December 31:

	Carrying Amount of Hedged Liabilities				Cumulative Amount of Fair Value Hedging Adjustment Increase (Decrease) Included in the Carrying Amount
	2019		2018		2019			2018
Balance Sheet Line Item in which Hedged Item is Included
Loans payable and current portion of long-term debt	$	1,249	$	—	$	(1	)	$	—
Long-Term Debt	3,409		4,560		14			(82		)

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 as of December 31:

		2019						2018
		Fair Value of Derivative				U.S. Dollar Notional		Fair Value of Derivative				U.S. Dollar Notional
	Balance Sheet Caption	Asset		Liability				Asset		Liability
Derivatives Designated as Hedging Instruments
Interest rate swap contracts	Other Assets	$	15	$	—	$	3,400	$	—	$	—	$	—
Interest rate swap contracts	Accrued and other current liabilities	—		1		1,250		—		—		—
Interest rate swap contracts	Other Noncurrent Liabilities	—		—		—		—		81		4,650
Foreign exchange contracts	Other current assets	152		—		6,117		263		—		6,222
Foreign exchange contracts	Other Assets	55		—		2,160		75		—		2,655
Foreign exchange contracts	Accrued and other current liabilities	—		22		1,748		—		7		774
Foreign exchange contracts	Other Noncurrent Liabilities	—		1		53		—		1		89
		$	222	$	24	$	14,728	$	338	$	89	$	14,390
Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts	Other current assets	$	66	$	—	$	7,245	$	116	$	—	$	5,430
Foreign exchange contracts	Accrued and other current liabilities	—		73		8,693		—		71		9,922
		$	66	$	73	$	15,938	$	116	$	71	$	15,352
		$	288	$	97	$	30,666	$	454	$	160	$	29,742

As noted above, the Company records its derivatives on a gross basis in the 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 at December 31:

	2019						2018
	Asset			Liability			Asset			Liability
Gross amounts recognized in the consolidated balance sheet	$	288		$	97		$	454		$	160
Gross amounts subject to offset in master netting arrangements not offset in the consolidated balance sheet	(84		)	(84		)	(121		)	(121		)
Cash collateral received	(34		)	—			(107		)	—
Net amounts	$	170		$	13		$	226		$	39

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The table below provides information regarding the location and amount of pretax (gains) losses of derivatives designated in fair value or cash flow hedging relationships:

	Sales							Other (income) expense, net (1)							Other comprehensive income (loss)
Years Ended December 31	2019		2018			2017		2019			2018		2017		2019			2018			2017
Financial Statement Line Items in which Effects of Fair Value or Cash Flow Hedges are Recorded	$	46,840	$	42,294		$	40,122	$	139		(402	)	(500	)	$	(648	)	$	(361	)	$	316
(Gain) loss on fair value hedging relationships
Interest rate swap contracts
Hedged items	—		—			—		95			(27	)	(48	)	—			—			—
Derivatives designated as hedging instruments	—		—			—		(65		)	50		12		—			—			—
Impact of cash flow hedging relationships
Foreign exchange contracts
Amount of gain (loss) recognized in OCI on derivatives	—		—			—		—			—		—		87			228			(562		)
(Decrease) increase in Sales as a result of AOCI reclassifications	255		(160		)	138		—			—		—		(255		)	160			(138		)
Interest rate contracts
Amount of gain recognized in Other (income) expense, net on derivatives	—		—			—		(4		)	(4	)	(3	)	—			—			—
Amount of loss recognized in OCI on derivatives	—		—			—		—			—		—		(6		)	(4		)	(3		)

⁽¹⁾ Interest expense is a component of Other (income) expense, net.

The table below provides information regarding the income statement effects of derivatives not designated as hedging instruments:

		Amount of Derivative Pretax (Gain) Loss Recognized in Income
Years Ended December 31	Income Statement Caption	2019		2018			2017
Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts (1)	Other (income) expense, net	$	174	$	(260	)	$	110
Foreign exchange contracts (2)	Sales	1		(8		)	(3		)

⁽¹⁾ 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.

⁽²⁾ These derivative contracts serve as economic hedges of forecasted transactions.

At December 31, 2019, the Company estimates $31 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.

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Investments in Debt and Equity Securities

Information on investments in debt and equity securities at December 31 is as follows:

	2019								2018
	Amortized Cost		Gross Unrealized				Fair Value		Amortized Cost		Gross Unrealized					Fair Value
			Gains		Losses						Gains		Losses
Commercial paper	$	668	$	—	$	—	$	668	$	—	$	—	$	—		$	—
Corporate notes and bonds	608		13		—		621		4,985		3		(68		)	4,920
U.S. government and agency securities	266		3		—		269		895		2		(5		)	892
Asset-backed securities	226		1		—		227		1,285		1		(11		)	1,275
Foreign government bonds	—		—		—		—		167		—		(1		)	166
Mortgage-backed securities	—		—		—		—		8		—		—			8
Total debt securities	1,768		17		—		1,785		7,340		6		(85		)	7,261
Publicly traded equity securities (1)							838									456
Total debt and publicly traded equity securities							$	2,623								$	7,717

⁽¹⁾ Unrealized net gains recognized in Other (income) expense, net on equity securities still held at December 31, 2019 were $160 million during 2019. Unrealized net losses recognized in Other (income) expense, net on equity securities still held at December 31, 2018 were $35 million during 2018.

At December 31, 2019 and 2018, the Company also had $420 million and $568 million, respectively, of equity investments without readily determinable fair values included in Other Assets. During 2019 and 2018, the Company recognized unrealized gains of $20 million and $167 million, respectively, in Other (income) expense, net, on certain of these equity investments based on favorable observable price changes from transactions involving similar investments of the same investee. In addition, during 2019 and 2018, the Company recognized unrealized losses of $13 million and $26 million, respectively, in Other (income) expense, net, related to certain of these investments based on unfavorable observable price changes. Cumulative unrealized gains and cumulative unrealized losses based on observable prices changes for investments in equity investments without readily determinable fair values were $109 million and $21 million, respectively.

Available-for-sale debt securities included in Short-term investments totaled $749 million at December 31, 2019. Of the remaining debt securities, $933 million mature within five years. At December 31, 2019 and 2018, 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.

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

Financial assets and liabilities measured at fair value on a recurring basis at December 31 are summarized below:

	Fair Value Measurements Using								Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	2019								2018
Assets
Investments
Commercial paper	$	—	$	668	$	—	$	668	$	—	$	—	$	—	$	—
Corporate notes and bonds	—		621		—		621		—		4,835		—		4,835
Asset-backed securities (1)	—		227		—		227		—		1,253		—		1,253
U.S. government and agency securities	—		209		—		209		—		731		—		731
Foreign government bonds	—		—		—		—		—		166		—		166
Publicly traded equity securities	518		—		—		518		147		—		—		147
	518		1,725		—		2,243		147		6,985		—		7,132
Other assets (2)
U.S. government and agency securities	60		—		—		60		55		106		—		161
Corporate notes and bonds	—		—		—		—		—		85		—		85
Asset-backed securities (1)	—		—		—		—		—		22		—		22
Mortgage-backed securities	—		—		—		—		—		8		—		8
Publicly traded equity securities	320		—		—		320		309		—		—		309
	380		—		—		380		364		221		—		585
Derivative assets (3)
Forward exchange contracts	—		169		—		169		—		241		—		241
Purchased currency options	—		104		—		104		—		213		—		213
Interest rate swaps	—		15		—		15		—		—		—		—
	—		288		—		288		—		454		—		454
Total assets	$	898	$	2,013	$	—	$	2,911	$	511	$	7,660	$	—	$	8,171
Liabilities
Other liabilities
Contingent consideration	$	—	$	—	$	767	$	767	$	—	$	—	$	788	$	788
Derivative liabilities (3)
Forward exchange contracts	—		95		—		95		—		74		—		74
Interest rate swaps	—		1		—		1		—		81		—		81
Written currency options	—		1		—		1		—		5		—		5
	—		97		—		97		—		160		—		160
Total liabilities	$	—	$	97	$	767	$	864	$	—	$	160	$	788	$	948

⁽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.

⁽²⁾  Investments included in other assets are restricted as to use, including for the payment of benefits under employee benefit plans.

⁽³⁾  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.

As of December 31, 2019, Cash and cash equivalents of $9.7 billion include $8.9 billion of cash equivalents (which would be considered Level 2 in the fair value hierarchy).

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Contingent Consideration

Summarized information about the changes in liabilities for contingent consideration associated with business acquisitions is as follows:

	2019			2018
Fair value January 1	$	788		$	935
Changes in estimated fair value (1)	64			89
Additions	—			8
Payments	(85		)	(244		)
Fair value December 31 (2)(3)	$	767		$	788

⁽¹⁾ Recorded in Cost of sales, Research and development expenses, and Other (income) expense, net. Includes cumulative translation adjustments.

⁽²⁾ Balance at December 31, 2019 includes $114 million recorded as a current liability for amounts expected to be paid within the next 12 months.

⁽³⁾ At December 31, 2019 and 2018, $625 million and $614 million, respectively, of the liabilities relate to the termination of the SPMSD joint venture in 2016. As part of the termination, Merck recorded a liability for contingent future royalty payments of 11.5% on net sales of all Merck products that were previously sold by the joint venture through December 31, 2024. The fair value of this liability is determined utilizing the estimated amount and timing of projected cash flows and a risk-adjusted discount rate of 8% is used to present value the cash flows.

The changes in the estimated fair value of liabilities for contingent consideration in 2019 and 2018 were largely attributable to increases in the liabilities recorded in connection with the termination of the Sanofi Pasteur MSD (SPMSD) joint venture in 2016. In 2018, these increases were partially offset by the reversal of a liability related to the discontinuation of a program obtained in connection with the acquisition of SmartCells (see Note 8). The payments of contingent consideration in both years relate to the SPMSD termination liabilities described above. The payments of contingent consideration in 2018 also include $175 million related to the achievement of a clinical development milestone for MK-7264 (gefapixant), a program obtained in connection with the acquisition of Afferent Pharmaceuticals.

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 December 31, 2019, was $28.8 billion compared with a carrying value of $26.3 billion and at December 31, 2018, was $25.6 billion compared with a carrying value of $25.1 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, Europe and China 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 global economic conditions, including the volatility associated with international sovereign economies, and associated impacts on the financial markets and its business. 

The Company’s customers with the largest accounts receivable balances are: McKesson Corporation, AmerisourceBergen Corporation and Cardinal Health, Inc., which represented, in aggregate, approximately 35% of total accounts receivable at December 31, 2019. The Company monitors the creditworthiness of its customers to which it grants credit terms in the normal course of business. Bad debts have been minimal. The Company does not normally require collateral or other security to support credit sales.

The Company has accounts receivable factoring agreements with financial institutions in certain countries to sell accounts receivable. In 2019, the Company expanded its factoring arrangements in China and entered into factoring agreements to sell accounts receivable from the Company’s major U.S. distributors. The Company factored

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$2.7 billion and $1.1 billion of accounts receivable in the fourth quarter of 2019 and 2018, respectively, under these factoring arrangements, which reduced outstanding accounts receivable. The cash received from the financial institutions is reported within operating activities in the Consolidated Statement of Cash Flows. In certain of these factoring arrangements, for ease of administration, the Company will collect customer payments related to the factored receivables, which it then remits to the financial institutions. At December 31, 2019, the Company had collected $256 million on behalf of the financial institutions, which is reflected as restricted cash in Other current assets and the related obligation to remit the cash within Accrued and other current liabilities. The Company remitted the cash to the financial institutions in January 2020. The net cash flows relating to these collections are reported as financing activities in the Consolidated Statement of Cash Flows. The costs of factoring such accounts receivable were de minimis.

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. Cash collateral received by the Company from various counterparties was $34 million and $107 million at December 31, 2019 and 2018, respectively. The obligation to return such collateral is recorded in Accrued and other current liabilities. No cash collateral was advanced by the Company to counterparties as of December 31, 2019 or 2018.

7.    Inventories

Inventories at December 31 consisted of:

	2019			2018
Finished goods	$	1,772		$	1,658
Raw materials and work in process	5,650			5,004
Supplies	207			194
Total (approximates current cost)	7,629			6,856
(Decrease) increase to LIFO cost	(171		)	1
	$	7,458		$	6,857
Recognized as:
Inventories	$	5,978		$	5,440
Other assets	1,480			1,417

Inventories valued under the LIFO method comprised approximately $2.6 billion and $2.5 billion at December 31, 2019 and 2018, respectively. Amounts recognized as Other assets are comprised almost entirely of raw materials and work in process inventories. At December 31, 2019 and 2018, these amounts included $1.3 billion and $1.4 billion, respectively, of inventories not expected to be sold within one year. In addition, these amounts included $168 million and $7 million at December 31, 2019 and 2018, respectively, of inventories produced in preparation for product launches.

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8.    Goodwill and Other Intangibles

The following table summarizes goodwill activity by segment:

 

	Pharmaceutical		Animal Health			All Other			Total
Balance January 1, 2018	$	16,066	$	1,877		$	341		$	18,284
Acquisitions	—		17			24			41
Impairments	—		—			(144		)	(144		)
Other (1)	96		(24		)	—			72
Balance December 31, 2018 (2)	16,162		1,870			221			18,253
Acquisitions	19		1,322			—			1,341
Impairments	—		—			(162		)	(162		)
Other (1)	—		—			(7		)	(7		)
Balance December 31, 2019 (2)	$	16,181	$	3,192		$	52		$	19,425

⁽¹⁾ Other includes cumulative translation adjustments on goodwill balances and certain other adjustments.

⁽²⁾ Accumulated goodwill impairment losses at December 31, 2019 and 2018 were $531 million and $369 million, respectively.

The additions to goodwill within the Animal Health segment in 2019 primarily relate to the acquisition of Antelliq (see Note 3). The impairments of goodwill within other non-reportable segments in 2019 and 2018 relate to certain businesses within the Healthcare Services segment.

Other intangibles at December 31 consisted of:

	2019						2018
	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Products and product rights	$	45,947	$	38,852	$	7,095	$	46,615	$	37,585	$	9,030
Licenses	3,185		824		2,361		2,081		408		1,673
IPR&D	1,032		—		1,032		1,064		—		1,064
Trade names	2,899		217		2,682		209		107		102
Other	2,261		1,235		1,026		2,403		1,168		1,235
	$	55,324	$	41,128	$	14,196	$	52,372	$	39,268	$	13,104

Acquired intangibles include products and product rights, licenses, trade names and patents, which are initially recorded at fair value, assigned an estimated useful life, and amortized primarily on a straight-line basis over their estimated useful lives. Some of the Company’s more significant acquired intangibles, on a net basis, related to human health marketed products (included in products and product rights above) at December 31, 2019 include Zerbaxa, $2.4 billion; Implanon/Nexplanon, $412 million; Gardasil/Gardasil 9, $314 million; Dificid, $312 million; Bridion, $230 million; Sivextro, $171 million; and Simponi, $163 million. Additionally, the Company had $2.4 billion of acquired intangibles related to animal health marketed products at December 31, 2019. Some of the Company’s more significant intangible assets included in licenses above at December 31, 2019 include Lenvima, $956 million and Lynparza, $955 million as a result of collaborations with Eisai and AstraZeneca (see Note 4). The increase in trade names in 2019 reflects $2.7 billion of intangibles acquired in the Antelliq acquisition in 2019 (see Note 3). The Company has an intangible asset related to Adempas as a result of a collaboration with Bayer (see Note 4) that had a carrying value of $883 million at December 31, 2019 reflected in “Other” in the table above.

In 2019, the Company recorded impairment charges related to marketed products and other intangibles of $705 million within Cost of sales. Of this amount, $612 million related to Sivextro, a product for the treatment of acute bacterial skin and skin structure infections caused by designated susceptible Gram-positive organisms. As part of a reorganization and reprioritization of its internal sales force, the Company made the decision to cease promotion of Sivextro in the U.S. market by the end of 2019. This decision resulted in reduced cash flow projections for Sivextro, which indicated that the Sivextro intangible asset value was not fully recoverable on an undiscounted cash flows basis. The Company utilized market participant assumptions to determine its best estimate of the fair value of the intangible

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asset related to Sivextro that, when compared with its related carrying value, resulted in the impairment charge noted above.

In 2017, the Company recorded impairment charges related to marketed products and other intangibles of $58 million. Of this amount, $47 million related to Intron A, a treatment for certain types of cancers. Sales of Intron A were being adversely affected by the availability of new therapeutic options. In 2017, sales of Intron A in the United States eroded more rapidly than previously anticipated by the Company, which led to changes in the cash flow assumptions for Intron A. These revisions to cash flows indicated that the Intron A intangible asset value was not fully recoverable on an undiscounted cash flows basis. The Company utilized market participant assumptions to determine its best estimate of the fair value of the intangible asset related to Intron A that, when compared with its related carrying value, resulted in the impairment charge noted above. The remaining charges in 2017 relate to the impairment of customer relationship, tradename and developed technology intangibles for certain businesses in the Healthcare Services segment.

IPR&D that the Company acquires through business combinations represents the fair value assigned to incomplete research projects which, at the time of acquisition, have not reached technological feasibility. Amounts capitalized as IPR&D are accounted for as indefinite-lived intangible assets, subject to impairment testing until completion or abandonment of the projects. Upon successful completion of each project, the Company will make a separate determination as to the then useful life of the asset and begin amortization.

In 2019, the Company recorded $172 million of IPR&D impairment charges within Research and development expenses. Of this amount, $155 million relates to the write-off of the intangible asset balance for programs obtained in connection with the acquisition of IOmet Pharma Ltd following a review of clinical trial results conducted by Merck, along with external clinical trial results for similar compounds. The discontinuation of this clinical development program resulted in a reversal of the related liability for contingent consideration of $11 million.

In 2018, the Company recorded $152 million of IPR&D impairment charges. Of this amount, $139 million relates to the write-off of the remaining intangible asset balance for a program obtained in connection with the SmartCells acquisition following a decision to terminate the program due to product development issues. The discontinuation of this clinical development program resulted in a reversal of the related liability for contingent consideration of $60 million (see Note 6).

In 2017, the Company recorded $483 million of IPR&D impairment charges. Of this amount, $240 million resulted from a strategic decision to discontinue the development of the investigational combination regimens MK-3682B (grazoprevir/ruzasvir/uprifosbuvir) and MK-3682C (ruzasvir/uprifosbuvir) for the treatment of chronic hepatitis C virus (HCV) infection. This decision was made based on a review of available Phase 2 efficacy data and in consideration of the evolving marketplace and the growing number of treatment options available for patients with chronic HCV infection, including Zepatier, which is marketed by the Company for the treatment of adult patients with chronic HCV infection. As a result of this decision, the Company recorded an IPR&D impairment charge to write-off the remaining intangible asset related to uprifosbuvir. The IPR&D impairment charges in 2017 also include a charge of $226 million to write-off the intangible asset related to verubecestat, an investigational small molecule inhibitor of the beta-site amyloid precursor protein cleaving enzyme 1 (BACE1), resulting from a decision in February 2018 to stop a Phase 3 study evaluating verubecestat in people with prodromal Alzheimer’s disease. The decision to stop the study followed a recommendation by the external Data Monitoring Committee (eDMC), which assessed overall benefit/risk during an interim safety analysis. The eDMC concluded that it was unlikely that positive benefit/risk could be established if the trial continued.

The IPR&D projects that remain in development are subject to the inherent risks and uncertainties in drug development and it is possible that the Company will not be able to successfully develop and complete the IPR&D programs and profitably commercialize the underlying product candidates.

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.

Aggregate amortization expense recorded within Cost of sales was $2.0 billion in 2019, $3.1 billion in 2018 and $3.2 billion in 2017. The estimated aggregate amortization expense for each of the next five years is as follows: 2020, $1.6 billion; 2021, $1.5 billion; 2022, $1.5 billion; 2023, $1.5 billion; 2024, $1.4 billion.

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9.    Loans Payable, Long-Term Debt and Leases

Loans Payable

Loans payable at December 31, 2019 included $1.9 billion of notes due in 2020, $1.4 billion of commercial paper and $226 million of long-dated notes that are subject to repayment at the option of the holders. Loans payable at December 31, 2018 included $5.1 billion of commercial paper and $149 million of long-dated notes that are subject to repayment at the option of the holders. The weighted-average interest rate of commercial paper borrowings was 2.23% and 2.09% for the years ended December 31, 2019 and 2018, respectively.

Long-Term Debt

Long-term debt at December 31 consisted of:

	2019		2018
2.75% notes due 2025	$	2,492	$	2,490
3.70% notes due 2045	1,975		1,974
2.80% notes due 2023	1,747		1,745
3.40% notes due 2029	1,732		—
4.00% notes due 2049	1,468		—
2.35% notes due 2022	1,248		1,214
4.15% notes due 2043	1,238		1,237
3.875% notes due 2021	1,151		1,132
1.125% euro-denominated notes due 2021	1,113		1,134
1.875% euro-denominated notes due 2026	1,107		1,127
2.40% notes due 2022	1,010		983
3.90% notes due 2039	982		—
2.90% notes due 2024	745		—
6.50% notes due 2033	722		726
0.50% euro-denominated notes due 2024	555		565
1.375% euro-denominated notes due 2036	551		561
2.50% euro-denominated notes due 2034	550		560
3.60% notes due 2042	490		490
6.55% notes due 2037	412		414
5.75% notes due 2036	338		338
5.95% debentures due 2028	306		306
5.85% notes due 2039	271		270
6.40% debentures due 2028	250		250
6.30% debentures due 2026	135		135
1.85% notes due 2020	—		1,231
Floating-rate notes due 2020	—		699
Other	148		225
	$	22,736	$	19,806

Other (as presented in the table above) includes $147 million and $223 million at December 31, 2019 and 2018, respectively, of borrowings at variable rates that resulted in effective interest rates of 2.54% and 2.27% for 2019 and 2018, respectively.

With the exception of the 6.30% debentures due 2026, the notes listed in the table above are redeemable in whole or in part, at Merck’s option at any time, at varying redemption prices.

In March 2019, the Company issued $5.0 billion principal amount of senior unsecured notes consisting of $750 million of 2.90% notes due 2024, $1.75 billion of 3.40% notes due 2029, $1.0 billion of 3.90% notes due 2039, and $1.5 billion of 4.00% notes due 2049. The Company used the net proceeds from the offering of $5.0 billion for general corporate purposes, including the repayment of outstanding commercial paper borrowings.

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Effective as of November 3, 2009, the Company executed a full and unconditional guarantee of the then existing debt of its subsidiary Merck Sharp & Dohme Corp. (MSD) and MSD executed a full and unconditional guarantee of the then existing debt of the Company (excluding commercial paper), including for payments of principal and interest. These guarantees do not extend to debt issued subsequent to that date.

Certain of the Company’s borrowings require that Merck comply with covenants and, at December 31, 2019, the Company was in compliance with these covenants.

The aggregate maturities of long-term debt for each of the next five years are as follows: 2020, $1.9 billion; 2021, $2.3 billion; 2022, $2.3 billion; 2023, $1.7 billion; 2024, $1.3 billion.

The Company has a $6.0 billion credit facility that matures in June 2024. 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.

Leases

As discussed in Note 1, on January 1, 2019, Merck adopted new guidance for the accounting and reporting of leases. The Company has operating leases primarily for manufacturing facilities, research and development facilities, corporate offices, employee housing, vehicles and certain equipment. As permitted under the transition guidance in ASC 842, the Company elected a package of practical expedients which, among other provisions, allowed the Company to carry forward historical lease classifications. The Company determines if an arrangement is a lease at inception. When evaluating contracts for embedded leases, the Company exercises judgment to determine if there is an explicit or implicit identified asset in the contract and if Merck controls the use of that asset. Embedded leases, primarily associated with contract manufacturing organizations, are immaterial.

Under ASC 842 transition guidance, Merck elected the hindsight practical expedient to determine the lease term for existing leases, which permits companies to consider available information prior to the effective date of the new guidance as to the actual or likely exercise of options to extend or terminate the lease. The lease term includes options to extend or terminate the lease when it is reasonably certain that Merck will exercise that option. Real estate leases for facilities have an average remaining lease term of eight years, which include options to extend the leases for up to four years where applicable. Vehicle leases are generally in effect for four years. The Company has made an accounting policy election not to record short-term leases (leases with an initial term of 12 months or less) on the balance sheet; however, Merck currently has no short-term leases.

Lease expense for operating lease payments is recognized on a straight-line basis over the term of the lease. Operating lease assets and liabilities are recognized based on the present value of lease payments over the lease term. Since the Company’s leases do not have a readily determinable implicit discount rate, the Company uses its incremental borrowing rate to calculate the present value of lease payments by asset class. On a quarterly basis, an updated incremental borrowing rate is determined based on the average remaining lease term of each asset class and the Company’s pretax cost of debt for that same term. The updated rates for each asset class are applied prospectively to new leases. As a practical expedient, the Company has made an accounting policy election for all asset classes not to separate lease components (e.g. payments for rent, real estate taxes and insurance costs) from non-lease components (e.g. common-area maintenance costs) in the event that the agreement contains both. Merck includes both the lease and non-lease components for purposes of calculating the right-of-use asset and related lease liability (if the non-lease components are fixed). For vehicle leases and employee housing, the Company applies a portfolio approach to effectively account for the operating lease assets and liabilities.

Certain of the Company’s lease agreements contain variable lease payments that are adjusted periodically for inflation or for actual operating expense true-ups compared with estimated amounts; however, these amounts are immaterial. Sublease income and activity related to sale and leaseback transactions are immaterial. Merck’s lease agreements do not contain any material residual value guarantees or material restrictive covenants.

Operating lease cost was $339 million in 2019. Cash paid for amounts included in the measurement of operating lease liabilities was $281 million in 2019. Operating lease assets obtained in exchange for lease obligations was $129 million in 2019.

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Supplemental balance sheet information related to operating leases is as follows:

December 31	2019
Assets
Other Assets (1)	$	1,073
Liabilities
Accrued and other current liabilities	236
Other Noncurrent Liabilities	768
	$	1,004
Weighted-average remaining lease term (years)	7.4
Weighted-average discount rate	3.2		%

⁽¹⁾ Includes prepaid leases that have no related lease liability.

Maturities of operating leases liabilities are as follows:

2020	$	264
2021	200
2022	168
2023	113
2024	89
Thereafter	297
Total lease payments	1,131
Less: Imputed interest	127
	$	1,004

At December 31, 2019, the Company had entered into additional real estate operating leases that had not yet commenced. The obligations associated with these leases total $538 million, of which $221 million relates to a lease that will commence in April 2020 and has a lease term of 10 years.

As of December 31, 2018, prior to the adoption of ASC 842, the minimum aggregate rental commitments under noncancellable leases were as follows: 2019, $188 million; 2020, $198 million; 2021, $150 million; 2022, $134 million; 2023, $84 million and thereafter, $243 million.

10.    Contingencies and Environmental Liabilities

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 governmental and 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 condition, 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.

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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.

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 December 31, 2019, approximately 3,750 cases are pending against Merck in either federal or state court. Plaintiffs in the vast majority of these cases generally allege that they sustained femur fractures and/or other bone injuries (Femur Fractures) in association with the use of Fosamax.

All federal cases involving allegations of Femur Fractures 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.

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). In March 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. Merck filed a petition for a writ of certiorari to the U.S. Supreme Court in August 2017, seeking review of the Third Circuit’s decision. The Supreme Court granted Merck’s petition in June 2018, and in May 2019, the Supreme Court issued its opinion and decided that the Third Circuit had incorrectly concluded that the issue of preemption should be resolved by a jury, and accordingly vacated the judgment of the Third Circuit and remanded the proceedings back to the Third Circuit to address the issue in a manner consistent with the Supreme Court’s opinion. On November 15, 2019, the Third Circuit remanded the cases back to the District Court in order to allow that court to determine in the first instance whether the plaintiffs’ state law claims are preempted by federal law under the standards described by the Supreme Court in its opinion. On December 13, 2019, the District Court ordered Merck to serve its opening brief on or before February 21, 2020, and plaintiffs to file their responsive brief on or before April 22, 2020. Merck may then file a reply on or before May 22, 2020.

Accordingly, as of December 31, 2019, approximately 970 cases were actively pending in the Femur Fracture MDL.

As of December 31, 2019, approximately 2,510 cases alleging Femur Fractures have been filed in New Jersey state court and are pending before Judge James Hyland in Middlesex County. The parties selected an initial group of cases to be reviewed through fact discovery, and Merck has continued to select additional cases to be reviewed.

As of December 31, 2019, approximately 275 cases alleging Femur Fractures have been filed and are pending in California state court. All of the Femur Fracture cases filed in California state court have been coordinated before a single judge in Orange County, California.

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

Discovery is presently stayed in the Femur Fracture MDL and in the state court in California. Merck 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 December 31, 2019, Merck is aware of approximately 1,380 product users alleging that Januvia and/or Janumet caused the development of pancreatic cancer and other injuries.

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Most claims have been filed in multidistrict litigation before the U.S. District Court for the Southern District of California (MDL). Outside of the MDL, the majority of claims have been filed in coordinated proceedings before 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 federal preemption.

Plaintiffs appealed in both forums. In November 2017, the U.S. Court of Appeals for the Ninth Circuit vacated the judgment and remanded for further discovery. In November 2018, the California state appellate court reversed and remanded on similar grounds. In March 2019, the parties in the MDL and the California coordinated proceeding agreed to coordinate and adopt a schedule for completing discovery on general causation and preemption issues and for renewing summary judgment and Daubert motions. Under the stipulated case management schedule, the hearings for Daubert and summary judgment motions are expected to take place in June 2020.

As of December 31, 2019, six product users have claims pending against Merck in state courts other than California, including Illinois. In June 2017, the Illinois trial court denied Merck’s motion for summary judgment based on federal preemption. Merck appealed, and the Illinois appellate court affirmed in December 2018. Merck filed a petition for leave to appeal to the Illinois Supreme Court in February 2019. In April 2019, the Illinois Supreme Court stayed consideration of the pending petition to appeal until the U.S. Supreme Court issued its opinion in Merck Sharp & Dohme Corp. v. Albrecht (relating to the Fosamax matter discussed above). Merck filed the opinion in Albrecht with the Illinois Supreme Court in June 2019. The petition for leave to appeal was decided on September 25, 2019, in which the Illinois Supreme Court directed the intermediate appellate court to reconsider its earlier ruling. The Illinois Appellate Court issued a favorable decision concluding, consistent with Albrecht, that preemption presents a legal question to be resolved by the court.

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

Vioxx

As previously disclosed, Merck is a defendant in a lawsuit brought by the Attorney General of Utah alleging that Merck misrepresented the safety of Vioxx. The lawsuit is pending in Utah state court. Utah seeks damages and penalties under the Utah False Claims Act. A bench trial in this matter is currently scheduled for April 20, 2020.

Governmental Proceedings

As previously disclosed, in the fall of 2018, the Company received a records subpoena from the U.S. Attorney’s Office for the District of Vermont (VT USAO) pursuant to Section 248 of the Health Insurance Portability and Accountability Act of 1996 (HIPAA) relating to an investigation of potential health care offenses. The subpoena sought information relating to any actual or potential business relationship or arrangement Merck has had with Practice Fusion, Inc. (PFI), a cloud-based, electronic health records (EHR) company that was acquired by Allscripts in January 2018. The Company cooperated with the government and responded to that subpoena. Subsequently, on May 21, 2019, Merck received a second records subpoena from the VT USAO that broadened the government’s information request by seeking information relating to Merck’s relationship with any EHR company. Shortly thereafter, the VT USAO served a Civil Investigation Demand (CID) upon Merck similarly seeking information on the Company’s relationships with EHR vendors. The CID explains that the government is conducting a False Claims Act investigation concerning whether Merck and/or PFI submitted claims to federal healthcare programs that violate the Federal Anti-Kickback Statute. Merck is cooperating with the government’s investigation.

As previously disclosed, on April 15, 2019, Merck received a set of investigative interrogatories from the California Attorney General’s Office pursuant to its investigation of conduct and agreements that allegedly affected or delayed competition to Lantus in the insulin market. The interrogatories seek information concerning Merck’s development of an insulin glargine product, and its subsequent termination, as well as Merck’s patent litigation against Sanofi S.A. concerning Lantus and the resolution of that litigation. Merck is cooperating with the California Attorney General’s investigation.

As previously disclosed, the Company’s subsidiaries in China have received and may continue to receive inquiries regarding their operations from various Chinese governmental agencies. Some of these inquiries may be

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related to matters involving other multinational pharmaceutical companies, as well as Chinese entities doing business with such companies. The Company’s policy is to cooperate with these authorities and to provide responses as appropriate.

As previously disclosed, from time to time, the Company receives inquiries and is the subject of preliminary investigation activities from competition and other governmental authorities in markets outside the United States. These authorities may include regulators, administrative authorities, and law enforcement and other similar officials, and these preliminary investigation activities may include site visits, formal or informal requests or demands for documents or materials, inquiries or interviews and similar matters. Certain of these preliminary inquiries or activities may lead to the commencement of formal proceedings. Should those proceedings be determined adversely to the Company, monetary fines and/or remedial undertakings may be required.

Commercial and Other Litigation

Zetia Antitrust Litigation

As previously disclosed, Merck, MSD, Schering Corporation and MSP Singapore Company LLC (collectively, the Merck Defendants) are defendants in putative class action and opt-out lawsuits filed in 2018 on behalf of direct and indirect purchasers of Zetia alleging violations of federal and state antitrust laws, as well as other state statutory and common law causes of action. The cases have been consolidated for pretrial purposes in a federal multidistrict litigation before Judge Rebecca Beach Smith in the Eastern District of Virginia. In December 2018, the court denied the Merck Defendants’ motions to dismiss or stay the direct purchaser putative class actions pending bilateral arbitration. On August 9, 2019, the district court adopted in full the report and recommendation of the magistrate judge with respect to the Merck Defendants’ motions to dismiss on non-arbitration issues, thereby granting in part and denying in part Merck Defendants’ motions to dismiss. In addition, on June 27, 2019, the representatives of the putative direct purchaser class filed an amended complaint and, on August 1, 2019, retailer opt-out plaintiffs filed an amended complaint. The Merck Defendants moved to dismiss the new allegations in both complaints. On October 15, 2019, the magistrate judge issued a report and recommendation recommending that the district judge grant the motions in their entirety. On December 20, 2019, the district court adopted this report and recommendation in part. The district court granted the Merck Defendants’ motion to dismiss to the extent the motion sought dismissal of claims for overcharges paid by entities that purchased generic ezetimibe from Par Pharmaceutical, Inc. (Par Pharmaceutical) and dismissed any claims for such overcharges. Trial is currently scheduled to begin on October 28, 2020.

Rotavirus Vaccines Antitrust Litigation

As previously disclosed, MSD is a defendant in putative class action lawsuits filed in 2018 on behalf of direct purchasers of RotaTeq, alleging violations of federal antitrust laws. The cases were consolidated in the Eastern District of Pennsylvania. On January 23, 2019, the court denied MSD’s motions to compel arbitration and to dismiss the consolidated complaint. On February 19, 2019, MSD appealed the court’s order on arbitration to the Third Circuit. On October 28, 2019, the Third Circuit vacated the district court’s order and remanded for limited discovery on the issue of arbitrability, after which MSD may file a renewed motion to compel arbitration.

Sales Force Litigation

As previously disclosed, in May 2013, Ms. Kelli Smith filed a complaint against the Company in the U.S. District Court for the District of New Jersey on behalf of herself and a putative class of female sales representatives and a putative sub-class of female sales representatives with children, claiming (a) discriminatory policies and practices in selection, promotion and advancement, (b) disparate pay, (c) differential treatment, (d) hostile work environment and (e) retaliation under federal and state discrimination laws. In April 2016, the Magistrate Judge granted plaintiffs’ request to amend the complaint to add the following: (i) a Company subsidiary as a corporate defendant; (ii) an ERISA claim and (iii) an individual constructive discharge claim for one of the named plaintiffs. Approximately 700 individuals opted-in to this action; the opt-in period has closed. In August 2017, plaintiffs filed their motion to certify a Title VII pay discrimination class and also sought final collective action certification of plaintiffs’ Equal Pay Act claim.

On October 1, 2018, the parties entered into an agreement to fully resolve the Smith sales force litigation. As part of the settlement and in exchange for a full and general release of all individual and class claims, the Company agreed to pay $8.5 million. On December 3, 2019, the court approved the settlement.

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Qui Tam Litigation

As previously disclosed, in June 2012, the U.S. District Court for the Eastern District of Pennsylvania unsealed a complaint that has been filed against the Company under the federal False Claims Act by two former employees alleging, among other things, that the Company defrauded the U.S. government by falsifying data in connection with a clinical study conducted on the mumps component of the Company’s M-M-R II vaccine. The complaint alleges the fraud took place between 1999 and 2001. The U.S. government had the right to participate in and take over the prosecution of this lawsuit but notified the court that it declined to exercise that right. The two former employees are pursuing the lawsuit without the involvement of the U.S. government. In addition, as previously disclosed, two putative class action lawsuits on behalf of direct purchasers of the M‑M‑R II vaccine, which charge that the Company misrepresented the efficacy of the M-M-R II vaccine in violation of federal antitrust laws and various state consumer protection laws, are pending in the Eastern District of Pennsylvania. In September 2014, the court denied Merck’s motion to dismiss the False Claims Act suit and granted in part and denied in part its motion to dismiss the then-pending antitrust suit. As a result, both the False Claims Act suit and the antitrust suits have proceeded into discovery, which is now complete, and the parties have filed and briefed cross-motions for summary judgment, which are currently pending before the Court. The Company continues to defend against these lawsuits.

Merck KGaA Litigation

As previously disclosed, 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), historically 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 UK, Germany, Switzerland, Mexico, India, Australia, Singapore, Hong Kong, and China alleging, among other things, unfair competition, trademark infringement and/or corporate name infringement. In the UK, Australia, Singapore, Hong Kong, and India, KGaA also alleges breach of the parties’ coexistence agreement. The litigation is ongoing in the United States with no trial date set, and also ongoing in numerous jurisdictions outside of the United States; the Company is defending those suits in each jurisdiction.

Patent Litigation

From time to time, generic manufacturers of pharmaceutical products file abbreviated New Drug Applications (NDAs) 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. 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.

Januvia, Janumet, Janumet XR — In February 2019, Par Pharmaceutical filed suit against the Company in the U.S. District Court for the District of New Jersey, seeking a declaratory judgment of invalidity of a patent owned by the Company covering certain salt and polymorphic forms of sitagliptin that expires in 2026. In response, the Company filed a patent infringement lawsuit in the U.S. District Court for the District of Delaware against Par Pharmaceutical and additional companies that also indicated an intent to market generic versions of Januvia, Janumet, and Janumet XR following expiration of key patent protection in 2022, but prior to the expiration of the later-granted patent owned by the Company covering certain salt and polymorphic forms of sitagliptin that expires in 2026, and a later granted patent owned by the Company covering the Janumet formulation which expires in 2028. Par Pharmaceutical dismissed its case in the U.S. District Court for the District of New Jersey against the Company and will litigate the action in the U.S. District Court for the District of Delaware. The Company filed a patent infringement lawsuit against Mylan Pharmaceuticals Inc. and Mylan Inc. (Mylan) in the Northern District of West Virginia. The Judicial Panel of Multidistrict Litigation entered an order transferring the Company’s lawsuit against Mylan to the U.S. District Court for the District of Delaware for coordinated and consolidated pretrial proceedings with the other cases pending in that district. The U.S. District Court for the District of Delaware has scheduled the lawsuits for a single 3-day trial on invalidity issues in October 2021. The Court will schedule separate 1-day trials on infringement issues if necessary. In October 2019, Mylan filed a petition for Inter Partes Review (IPR) at the United States Patent and Trademark Office

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(USPTO) seeking invalidity of the 2026 patent. The USPTO has six months from filing to determine whether it will institute the requested IPR proceeding.

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 condition, 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 December 31, 2019 and 2018 of approximately $240 million and $245 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.

Environmental Matters

The Company and its subsidiaries are parties to a number of proceedings brought under the Comprehensive Environmental Response, Compensation and Liability Act, commonly known as Superfund, and other federal and state equivalents. These proceedings seek to require the operators of hazardous waste disposal facilities, transporters of waste to the sites and generators of hazardous waste disposed of at the sites to clean up the sites or to reimburse the government for cleanup costs. The Company has been made a party to these proceedings as an alleged generator of waste disposed of at the sites. In each case, the government alleges that the defendants are jointly and severally liable for the cleanup costs. Although joint and several liability is alleged, these proceedings are frequently resolved so that the allocation of cleanup costs among the parties more nearly reflects the relative contributions of the parties to the site situation. The Company’s potential liability varies greatly from site to site. For some sites the potential liability is de minimis and for others the final costs of cleanup have not yet been determined. While it is not feasible to predict the outcome of many of these proceedings brought by federal or state agencies or private litigants, in the opinion of the Company, such proceedings should not ultimately result in any liability which would have a material adverse effect on the financial condition, results of operations or liquidity of the Company. The Company has taken an active role in identifying and accruing for these costs and such amounts do not include any reduction for anticipated recoveries of cleanup costs from former site owners or operators or other recalcitrant potentially responsible parties.

In management’s opinion, the liabilities for all environmental matters that are probable and reasonably estimable have been accrued and totaled $67 million and $71 million at December 31, 2019 and 2018, respectively. These liabilities are undiscounted, do not consider potential recoveries from other parties and will be paid out over the periods of remediation for the applicable sites, which are expected to occur primarily over the next 15 years. Although it is not possible to predict with certainty the outcome of these matters, or the ultimate costs of remediation, management does not believe that any reasonably possible expenditures that may be incurred in excess of the liabilities accrued should exceed $58 million in the aggregate. Management also does not believe that these expenditures should result in a material adverse effect on the Company’s financial condition, results of operations or liquidity for any year.

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11.    Equity

The Merck certificate of incorporation authorizes 6,500,000,000 shares of common stock and 20,000,000 shares of preferred stock.

Capital Stock

A summary of common stock and treasury stock transactions (shares in millions) is as follows:

	2019			2018			2017
	Common Stock	Treasury Stock		Common Stock	Treasury Stock		Common Stock	Treasury Stock
Balance January 1	3,577	985		3,577	880		3,577	828
Purchases of treasury stock	—	66		—	122		—	67
Issuances (1)	—	(13	)	—	(17	)	—	(15	)
Balance December 31	3,577	1,038		3,577	985		3,577	880

⁽¹⁾   Issuances primarily reflect activity under share-based compensation plans.

On October 25, 2018, the Company entered into accelerated share repurchase (ASR) agreements with two third-party financial institutions (Dealers). Under the ASR agreements, Merck agreed to purchase $5 billion of Merck’s common stock, in total, with an initial delivery of 56.7 million shares of Merck’s common stock, based on the then-current market price, made by the Dealers to Merck, and payments of $5 billion made by Merck to the Dealers on October 29, 2018, which were funded with existing cash and investments, as well as short-term borrowings. The payments to the Dealers were recorded as reductions to shareholders’ equity, consisting of a $4 billion increase in treasury stock, which reflected the value of the initial 56.7 million shares received on October 29, 2018, and a $1 billion decrease in other-paid-in capital, which reflected the value of the stock held back by the Dealers pending final settlement. Upon settlement of the ASR agreements in April 2019, Merck received an additional 7.7 million shares as determined by the average daily volume weighted-average price of Merck’s common stock during the term of the ASR program, less a negotiated discount, bringing the total shares received by Merck under this program to 64.4 million.

12.    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. These plans were approved by the Company’s shareholders.

At December 31, 2019, 111 million shares collectively were authorized for future grants under the Company’s share-based compensation plans. These awards are settled with treasury shares.

Employee stock options are granted to purchase shares of Company stock at the fair market value at the time of grant. These awards generally vest one-third each year over a three-year period, with a contractual term of 7-10 years. RSUs are stock awards that are granted to employees and entitle the holder to shares of common stock as the awards vest. The fair value of the stock option and RSU awards is determined and fixed on the grant date based on the Company’s stock price. PSUs are stock awards where the ultimate number of shares issued will be contingent on the Company’s performance against a pre-set objective or set of objectives. The fair value of each PSU is determined on the date of grant based on the Company’s stock price. For RSUs and PSUs, dividends declared during the vesting period are payable to the employees only upon vesting. Over the PSU performance period, the number of shares of stock that are expected to be issued will be adjusted based on the probability of achievement of a performance target and final compensation expense will be recognized based on the ultimate number of shares issued. RSU and PSU distributions will be in shares of Company stock after the end of the vesting or performance period, subject to the terms applicable to such awards. PSU awards generally vest after three years. Prior to 2018, RSU awards generally vested after three years; beginning with awards granted in 2018, RSU awards generally vest one-third each year over a three-year period.

Total pretax share-based compensation cost recorded in 2019, 2018 and 2017 was $417 million, $348 million and $312 million, respectively, with related income tax benefits of $57 million, $55 million and $57 million, respectively.

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The Company uses the Black-Scholes option pricing model for determining the fair value of option grants. In applying this model, the Company uses both historical data and current market data to estimate the fair value of its options. The Black-Scholes model requires several assumptions including expected dividend yield, risk-free interest rate, volatility, and term of the options. The expected dividend yield is based on historical patterns of dividend payments. The risk-free interest rate is based on the rate at grant date of zero-coupon U.S. Treasury Notes with a term equal to the expected term of the option. Expected volatility is estimated using a blend of historical and implied volatility. The historical component is based on historical monthly price changes. The implied volatility is obtained from market data on the Company’s traded options. The expected life represents the amount of time that options granted are expected to be outstanding, based on historical and forecasted exercise behavior.

The weighted average exercise price of options granted in 2019, 2018 and 2017 was $80.05, $58.15 and $63.88 per option, respectively. The weighted average fair value of options granted in 2019, 2018 and 2017 was $10.63, $8.26 and $7.04 per option, respectively, and were determined using the following assumptions:

Years Ended December 31	2019		2018		2017
Expected dividend yield	3.2	%	3.4	%	3.6	%
Risk-free interest rate	2.4	%	2.9	%	2.0	%
Expected volatility	18.7	%	19.1	%	17.8	%
Expected life (years)	5.9		6.1		6.1

Summarized information relative to stock option plan activity (options in thousands) is as follows:

	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding January 1, 2019	23,807		$	51.89
Granted	2,796		80.05
Exercised	(8,119	)	44.48
Forfeited	(616	)	45.48
Outstanding December 31, 2019	17,868		$	59.88	6.48	$	555
Exercisable December 31, 2019	11,837		$	55.40	5.45	$	421

Additional information pertaining to stock option plans is provided in the table below:

Years Ended December 31	2019		2018		2017
Total intrinsic value of stock options exercised	$	295	$	348	$	236
Fair value of stock options vested	27		29		30
Cash received from the exercise of stock options	361		591		499

A summary of nonvested RSU and PSU activity (shares in thousands) is as follows:

	RSUs				PSUs
	Number of Shares		Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value
Nonvested January 1, 2019	16,128		$	58.85	2,039		$	59.42
Granted	4,811		80.08		763		83.90
Vested	(6,594	)	55.70		(748	)	57.87
Forfeited	(818	)	64.75		(82	)	66.68
Nonvested December 31, 2019	13,527		$	67.58	1,972		$	69.18

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At December 31, 2019, there was $603 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 1.9 years. For segment reporting, share-based compensation costs are unallocated expenses.

13.    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. In addition, the Company provides medical benefits, principally to its eligible U.S. retirees and their dependents, through its other postretirement benefit plans. The Company uses December 31 as the year-end measurement date for all of its pension plans and other postretirement benefit plans.

Net Periodic Benefit Cost

The net periodic benefit cost (credit) for pension and other postretirement benefit plans consisted of the following components:

	Pension Benefits
	U.S.									International									Other Postretirement Benefits
Years Ended December 31	2019			2018			2017			2019			2018			2017			2019			2018			2017
Service cost	$	293		$	326		$	312		$	238		$	238		$	252		$	48		$	57		$	57
Interest cost	458			432			454			177			178			172			69			69			81
Expected return on plan assets	(817		)	(851		)	(862		)	(426		)	(431		)	(393		)	(72		)	(83		)	(78		)
Amortization of unrecognized prior service cost	(49		)	(50		)	(53		)	(12		)	(13		)	(11		)	(78		)	(84		)	(98		)
Net loss amortization	151			232			180			64			84			98			(10		)	1			1
Termination benefits	31			19			44			8			2			4			5			3			8
Curtailments	14			10			3			6			1			(4		)	(11		)	(8		)	(31		)
Settlements	—			5			—			1			13			5			—			—			—
Net periodic benefit cost (credit)	$	81		$	123		$	78		$	56		$	72		$	123		$	(49	)	$	(45	)	$	(60	)

The changes in net periodic benefit cost (credit) year over year for pension plans are largely attributable to changes in the discount rate affecting net loss amortization.

In connection with restructuring actions (see Note 5), termination charges were recorded in 2019, 2018 and 2017 on pension and other postretirement benefit plans related to expanded eligibility for certain employees exiting Merck. Also, in connection with these restructuring activities, curtailments were recorded on pension and other postretirement benefit plans and settlements were recorded on certain U.S. and international pension plans as reflected in the table above.

The components of net periodic benefit cost (credit) other than the service cost component are included in Other (income) expense, net (see Note 14), with the exception of certain amounts for termination benefits, curtailments and settlements, which are recorded in Restructuring costs if the event giving rise to the termination benefits, curtailment or settlement is related to restructuring actions as noted above.

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Obligations and Funded Status

Summarized information about the changes in plan assets and benefit obligations, the funded status and the amounts recorded at December 31 is as follows:

	Pension Benefits												Other Postretirement Benefits
	U.S.						International
	2019			2018			2019			2018			2019			2018
Fair value of plan assets January 1	$	9,648		$	10,896		$	8,580		$	9,339		$	968		$	1,114
Actual return on plan assets	2,165			(810		)	1,505			(289		)	203			(72		)
Company contributions	130			378			262			167			14			6
Effects of exchange rate changes	—			—			31			(352		)	—			—
Benefits paid	(582		)	(772		)	(230		)	(202		)	(104		)	(80		)
Settlements	—			(44		)	(12		)	(106		)	—			—
Other	—			—			27			23			21			—
Fair value of plan assets December 31	$	11,361		$	9,648		$	10,163		$	8,580		$	1,102		$	968
Benefit obligation January 1	$	10,620		$	11,904		$	9,083		$	9,483		$	1,615		$	1,922
Service cost	293			326			238			238			48			57
Interest cost	458			432			177			178			69			69
Actuarial losses (gains) (1)	2,165			(1,258		)	1,313			(154		)	21			(341		)
Benefits paid	(582		)	(772		)	(230		)	(202		)	(104		)	(80		)
Effects of exchange rate changes	—			—			4			(387		)	1			(6		)
Plan amendments	—			—			1			10			—			(9		)
Curtailments	18			13			3			(2		)	—			—
Termination benefits	31			19			8			2			5			3
Settlements	—			(44		)	(12		)	(106		)	—			—
Other	—			—			27			23			18			—
Benefit obligation December 31	$	13,003		$	10,620		$	10,612		$	9,083		$	1,673		$	1,615
Funded status December 31	$	(1,642	)	$	(972	)	$	(449	)	$	(503	)	$	(571	)	$	(647	)
Recognized as:
Other Assets	$	—		$	—		$	837		$	659		$	—		$	—
Accrued and other current liabilities	(92		)	(47		)	(18		)	(14		)	(10		)	(10		)
Other Noncurrent Liabilities	(1,550		)	(925		)	(1,268		)	(1,148		)	(561		)	(637		)

⁽¹⁾ Actuarial losses (gains) primarily reflect changes in discount rates.

At December 31, 2019 and 2018, the accumulated benefit obligation was $22.8 billion and $19.0 billion, respectively, for all pension plans, of which $12.8 billion and $10.4 billion, respectively, related to U.S. pension plans.

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Information related to the funded status of selected pension plans at December 31 is as follows:

	U.S.				International
	2019		2018		2019		2018
Pension plans with a projected benefit obligation in excess of plan assets
Projected benefit obligation	$	13,003	$	10,620	$	7,421	$	6,251
Fair value of plan assets	11,361		9,648		6,135		5,089
Pension plans with an accumulated benefit obligation in excess of plan assets
Accumulated benefit obligation	$	12,009	$	9,702	$	2,476	$	5,936
Fair value of plan assets	10,484		8,966		1,501		5,071

Plan Assets

Entities are required to use 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. The Level 3 assets are those whose values are determined using pricing models, discounted cash flow methodologies, or similar techniques with significant unobservable inputs, as well as instruments for which the determination of fair value requires significant judgment or estimation. At December 31, 2019 and 2018, $860 million and $826 million, respectively, or approximately 4% and 5%, respectively, of the Company’s pension investments were categorized as Level 3 assets.

If the inputs used to measure the financial assets 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.

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The fair values of the Company’s pension plan assets at December 31 by asset category are as follows:

	Fair Value Measurements Using										Fair Value Measurements Using
	Level 1		Level 2		Level 3		NAV (1)		Total		Level 1		Level 2		Level 3		NAV (1)		Total
	2019										2018
U.S. Pension Plans
Assets
Cash and cash equivalents	$	3	$	—	$	—	$	236	$	239	$	40	$	—	$	—	$	182	$	222
Investment funds
Developed markets equities	205		—		—		3,542		3,747		169		—		—		3,021		3,190
Emerging markets equities	165		—		—		723		888		121		—		—		720		841
Government and agency obligations	—		—		—		173		173		—		—		—		161		161
Corporate obligations	—		—		—		—		—		—		—		—		32		32
Equity securities
Developed markets	2,451		—		—		—		2,451		2,172		—		—		—		2,172
Fixed income securities																			—
Government and agency obligations	—		2,094		—		—		2,094		—		1,509		—		—		1,509
Corporate obligations	—		1,582		—		—		1,582		—		1,246		—		—		1,246
Mortgage and asset-backed securities	—		178		—		—		178		—		262		—		—		262
Other investments	—		—		9		—		9		—		—		13		—		13
Plan assets at fair value	$	2,824	$	3,854	$	9	$	4,674	$	11,361	$	2,502	$	3,017	$	13	$	4,116	$	9,648
International Pension Plans
Assets
Cash and cash equivalents	$	70	$	1	$	—	$	15	$	86	$	50	$	3	$	—	$	16	$	69
Investment funds
Developed markets equities	546		3,761		—		96		4,403		461		3,071		—		75		3,607
Government and agency obligations	462		2,534		—		207		3,203		372		2,082		—		180		2,634
Emerging markets equities	66		96		—		90		252		56		112		—		83		251
Corporate obligations	5		11		—		109		125		4		7		—		94		105
Fixed income obligations	9		6		—		—		15		7		4		—		—		11
Real estate	—		1		—		—		1		—		1		1		—		2
Equity securities
Developed markets	565		—		—		—		565		544		—		—		—		544
Fixed income securities
Government and agency obligations	3		376		—		—		379		2		291		—		—		293
Corporate obligations	1		135		—		—		136		1		113		—		—		114
Mortgage and asset-backed securities	—		61		—		—		61		—		55		—		—		55
Other investments
Insurance contracts (2)	—		65		851		—		916		—		66		811		—		877
Other	—		5		—		16		21		—		4		1		13		18
Plan assets at fair value	$	1,727	$	7,052	$	851	$	533	$	10,163	$	1,497	$	5,809	$	813	$	461	$	8,580

⁽¹⁾  Certain investments that were measured at net asset value (NAV) per share or its equivalent have not been classified in the fair value hierarchy. The NAV amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets at December 31, 2019 and 2018.

⁽²⁾  The plans’ Level 3 investments in insurance contracts are generally valued using a crediting rate that approximates market returns and invest in underlying securities whose market values are unobservable and determined using pricing models, discounted cash flow methodologies, or similar techniques.

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The table below provides a summary of the changes in fair value, including transfers in and/or out, of all financial assets measured at fair value using significant unobservable inputs (Level 3) for the Company’s pension plan assets:

	2019												2018
	Insurance Contracts			Real Estate			Other			Total			Insurance Contracts			Real Estate			Other			Total
U.S. Pension Plans
Balance January 1	$	—		$	—		$	13		$	13		$	—		$	—		$	15		$	15
Actual return on plan assets:
Relating to assets still held at December 31	—			—			(8		)	(8		)	—			—			(3		)	(3		)
Relating to assets sold during the year	—			—			8			8			—			—			4			4
Purchases and sales, net	—			—			(4		)	(4		)	—			—			(3		)	(3		)
Balance December 31	$	—		$	—		$	9		$	9		$	—		$	—		$	13		$	13
International Pension Plans
Balance January 1	$	811		$	1		$	1		$	813		$	470		$	2		$	1		$	473
Actual return on plan assets:
Relating to assets still held at December 31	54			—			—			54			(32		)	—			—			(32		)
Purchases and sales, net	(14		)	(1		)	(1		)	(16		)	380			(1		)	—			379
Transfers out of Level 3	—			—			—			—			(7		)	—			—			(7		)
Balance December 31	$	851		$	—		$	—		$	851		$	811		$	1		$	1		$	813

The fair values of the Company’s other postretirement benefit plan assets at December 31 by asset category are as follows:

	Fair Value Measurements Using										Fair Value Measurements Using
	Level 1		Level 2		Level 3		NAV (1)		Total		Level 1		Level 2		Level 3		NAV (1)		Total
	2019										2018
Assets
Cash and cash equivalents	$	52	$	—	$	—	$	22	$	74	$	78	$	—	$	—	$	16	$	94
Investment funds
Developed markets equities	19		—		—		324		343		16		—		—		279		295
Emerging markets equities	15		—		—		66		81		12		—		—		67		79
Government and agency obligations	1		—		—		16		17		1		—		—		15		16
Corporate obligations	—		—		—		—		—		—		—		—		3		3
Equity securities																			—
Developed markets	225		—		—		—		225		200		—		—		—		200
Fixed income securities
Government and agency obligations	—		196		—		—		196		—		141		—		—		141
Corporate obligations	—		149		—		—		149		—		116		—		—		116
Mortgage and asset-backed securities	—		17		—		—		17		—		24		—		—		24
Plan assets at fair value	$	312	$	362	$	—	$	428	$	1,102	$	307	$	281	$	—	$	380	$	968

⁽¹⁾  Certain investments that were measured at net asset value (NAV) per share or its equivalent have not been classified in the fair value hierarchy. The NAV amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets at December 31, 2019 and 2018.

The Company has established investment guidelines for its U.S. pension and other postretirement plans to create an asset allocation that is expected to deliver a rate of return sufficient to meet the long-term obligation of each plan, given an acceptable level of risk. The target investment portfolio of the Company’s U.S. pension and other postretirement benefit plans is allocated 30% to 45% in U.S. equities, 15% to 30% in international equities, 35% to 45% in fixed-income investments, and up to 5% in cash and other investments. The portfolio’s equity weighting is consistent with the long-term nature of the plans’ benefit obligations. The expected annual standard deviation of returns

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of the target portfolio, which approximates 10%, reflects both the equity allocation and the diversification benefits among the asset classes in which the portfolio invests. For international pension plans, the targeted investment portfolio varies based on the duration of pension liabilities and local government rules and regulations. Although a significant percentage of plan assets are invested in U.S. equities, concentration risk is mitigated through the use of strategies that are diversified within management guidelines.

Expected Contributions

Expected contributions during 2020 are approximately $100 million for U.S. pension plans, approximately $150 million for international pension plans and approximately $15 million for other postretirement benefit plans.

Expected Benefit Payments

Expected benefit payments are as follows:

	U.S. Pension Benefits		International Pension Benefits		Other Postretirement Benefits
2020	$	747	$	242	$	88
2021	717		225		92
2022	710		243		94
2023	718		250		98
2024	708		250		100
2025 — 2029	3,943		1,417		540

Expected benefit payments are based on the same assumptions used to measure the benefit obligations and include estimated future employee service.

Amounts Recognized in Other Comprehensive Income

Net loss amounts reflect experience differentials primarily relating to differences between expected and actual returns on plan assets as well as the effects of changes in actuarial assumptions. Net loss amounts in excess of certain thresholds are amortized into net periodic benefit cost over the average remaining service life of employees. The following amounts were reflected as components of OCI:

	Pension Plans																		Other Postretirement Benefit Plans
	U.S.									International
Years Ended December 31	2019			2018			2017			2019			2018			2017			2019			2018			2017
Net (loss) gain arising during the period	$	(816	)	$	(397	)	$	(19	)	$	(227	)	$	(505	)	$	309		$	112		$	186		$	170
Prior service (cost) credit arising during the period	(4		)	(4		)	(13		)	(1		)	(10		)	22			(11		)	2			(31		)
	$	(820	)	$	(401	)	$	(32	)	$	(228	)	$	(515	)	$	331		$	101		$	188		$	139
Net loss amortization included in benefit cost	$	151		$	232		$	180		$	64		$	84		$	98		$	(10	)	$	1		$	1
Prior service credit amortization included in benefit cost	(49		)	(50		)	(53		)	(12		)	(13		)	(11		)	(78		)	(84		)	(98		)
	$	102		$	182		$	127		$	52		$	71		$	87		$	(88	)	$	(83	)	$	(97	)

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Actuarial Assumptions

The Company reassesses its benefit plan assumptions on a regular basis. The weighted average assumptions used in determining U.S. pension and other postretirement benefit plan and international pension plan information are as follows:

	U.S. Pension and Other Postretirement Benefit Plans						International Pension Plans
December 31	2019		2018		2017		2019		2018		2017
Net periodic benefit cost
Discount rate	4.40	%	3.70	%	4.30	%	2.20	%	2.10	%	2.20	%
Expected rate of return on plan assets	8.10	%	8.20	%	8.70	%	4.90	%	5.10	%	5.10	%
Salary growth rate	4.30	%	4.30	%	4.30	%	2.80	%	2.90	%	2.90	%
Interest crediting rate	3.40	%	3.30	%	3.30	%	2.90	%	2.80	%	3.00	%
Benefit obligation
Discount rate	3.40	%	4.40	%	3.70	%	1.50	%	2.20	%	2.10	%
Salary growth rate	4.20	%	4.30	%	4.30	%	2.80	%	2.80	%	2.90	%
Interest crediting rate	4.90	%	3.40	%	3.30	%	2.80	%	2.90	%	2.80	%

For both the pension and other postretirement benefit plans, the discount rate is evaluated on measurement dates and modified to reflect the prevailing market rate of a portfolio of high-quality fixed-income debt instruments that would provide the future cash flows needed to pay the benefits included in the benefit obligation as they come due. The expected rate of return for both the pension and other postretirement benefit plans represents the average rate of return to be earned on plan assets over the period the benefits included in the benefit obligation are to be paid and is determined on a plan basis. The expected rate of return for each plan is developed considering long-term historical returns data, current market conditions, and actual returns on the plan assets. Using this reference information, the long-term return expectations for each asset category and a weighted-average expected return for each plan’s target portfolio is developed, according to the allocation among those investment categories. The expected portfolio performance reflects the contribution of active management as appropriate. For 2020, the expected rate of return for the Company’s U.S. pension and other postretirement benefit plans will range from 7.00% to 7.30%, as compared to a range of 7.70% to 8.10% in 2019. The decrease reflects lower expected asset returns and a modest shift in asset allocation. The change in the weighted-average expected return on U.S. pension and other postretirement benefit plan assets from 2017 to 2019 is due to the relative weighting of the referenced plans’ assets.

The health care cost trend rate assumptions for other postretirement benefit plans are as follows:

December 31	2019		2018
Health care cost trend rate assumed for next year	6.8	%	7.0	%
Rate to which the cost trend rate is assumed to decline	4.5	%	4.5	%
Year that the trend rate reaches the ultimate trend rate	2032		2032

Savings Plans

The Company also maintains defined contribution savings plans in the United States. The Company matches a percentage of each employee’s contributions consistent with the provisions of the plan for which the employee is eligible. Total employer contributions to these plans in 2019, 2018 and 2017 were $149 million, $136 million and $131 million, respectively.

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14.    Other (Income) Expense, Net

Other (income) expense, net, consisted of:

Years Ended December 31	2019			2018			2017
Interest income	$	(274	)	$	(343	)	$	(385	)
Interest expense	893			772			754
Exchange losses (gains)	187			145			(11		)
Income from investments in equity securities, net (1)	(170		)	(324		)	(352		)
Net periodic defined benefit plan (credit) cost other than service cost	(545		)	(512		)	(512		)
Other, net	48			(140		)	6
	$	139		$	(402	)	$	(500	)

⁽¹⁾ Includes net realized and unrealized gains and losses from investments in equity securities either owned directly or through ownership interests in investment funds.

Other, net (as presented in the table above) in 2019 includes $162 million of goodwill impairment charges related to certain businesses in the Healthcare Services segment (see Note 8).

Other, net in 2018 includes a gain of $115 million related to the settlement of certain patent litigation, income of $99 million related to AstraZeneca’s option exercise in 2014 in connection with the termination of the Company’s relationship with AstraZeneca LP (AZLP), and a gain of $85 million resulting from the receipt of a milestone payment for an out-licensed migraine clinical development program. Other, net in 2018 also includes $144 million of goodwill impairment charges related to certain businesses in the Healthcare Services segment (see Note 8), as well as $41 million of charges related to the write-down of assets held for sale to fair value in anticipation of the dissolution of the Company’s joint venture with Supera Farma Laboratorios S.A. in Brazil.

Other, net in 2017 includes income of $232 million related to AstraZeneca’s option exercise and a $191 million loss on extinguishment of debt.

Interest paid was $841 million in 2019, $777 million in 2018 and $723 million in 2017.

15.    Taxes on Income

A reconciliation between the effective tax rate and the U.S. statutory rate is as follows:

	2019					2018					2017
	Amount			Tax Rate		Amount			Tax Rate		Amount			Tax Rate
U.S. statutory rate applied to income before taxes	$	2,408		21.0	%	$	1,827		21.0	%	$	2,282		35.0	%
Differential arising from:
Foreign earnings	(1,020		)	(8.9	)	(245		)	(2.8	)	(1,654		)	(25.4	)
GILTI and the foreign-derived intangible income deduction	336			2.9		(25		)	(0.3	)	—			—
Tax settlements	(403		)	(3.5	)	(22		)	(0.3	)	(356		)	(5.5	)
R&D tax credit	(118		)	(1.0	)	(96		)	(1.1	)	(71		)	(1.1	)
State taxes	(2		)	—		201			2.3		77			1.2
Acquisition of Peloton	209			1.8		—			—		—			—
TCJA	117			1.0		289			3.3		2,625			40.3
Valuation allowances	113			1.0		269			3.1		632			9.7
Acquisition-related costs, including amortization	95			0.8		267			3.1		713			10.9
Restructuring	39			0.3		56			0.6		142			2.2
Other (1)	(87		)	(0.7	)	(13		)	(0.1	)	(287		)	(4.4	)
	$	1,687		14.7	%	$	2,508		28.8	%	$	4,103		62.9	%

⁽¹⁾  Other includes the tax effects of losses on foreign subsidiaries and miscellaneous items.

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The Tax Cuts and Jobs Act (TCJA) was enacted in December 2017. Among other provisions, the TCJA reduced the U.S. federal corporate statutory tax rate from 35% to 21% effective January 1, 2018, required companies to pay a one-time transition tax on undistributed earnings of certain foreign subsidiaries, and created new taxes on certain foreign sourced earnings. The Company reflected the impact of the TCJA in its 2017 financial statements. However, since application of certain provisions of the TCJA remained subject to further interpretation, in certain instances the Company made reasonable estimates of the effects of the TCJA, which were since finalized as described below.

The one-time transition tax is based on the Company’s post-1986 undistributed earnings and profits (E&P). For a substantial portion of these undistributed E&P, the Company had not previously provided deferred taxes as these earnings were deemed by Merck to be retained indefinitely by subsidiary companies for reinvestment. The Company recorded a provisional amount in 2017 for its one-time transition tax liability of $5.3 billion. This provisional amount was reduced by the reversal of $2.0 billion of deferred taxes that were previously recorded in connection with the merger of Schering-Plough Corporation in 2009 for certain undistributed foreign E&P. On the basis of revised calculations of post-1986 undistributed foreign E&P and finalization of the amounts held in cash or other specified assets, the Company recognized a measurement-period adjustment of $124 million in 2018 related to the transition tax obligation, with a corresponding adjustment to income tax expense during the period, resulting in a revised transition tax obligation of $5.5 billion. In 2019, the Company recorded additional charges of $117 million related to the finalization of treasury regulations associated with the TCJA. As permitted under the TCJA, the Company has elected to pay the one-time transition tax over a period of eight years through 2025. The Company’s remaining transition tax liability, which has been reduced by payments and the utilization of foreign tax credits, was $3.4 billion at December 31, 2019, of which $390 million is included in Income taxes payable and the remainder of $3.0 billion is included in Other Noncurrent Liabilities. In 2017, the Company remeasured its deferred tax assets and liabilities at the new federal statutory tax rate of 21%, which resulted in a provisional deferred tax benefit of $779 million. On the basis of clarifications to the deferred tax benefit calculation, the Company recorded measurement-period adjustments in 2018 of $32 million related to deferred income taxes.

The foreign earnings tax rate differentials in the tax rate reconciliation above primarily reflect the impacts of operations in jurisdictions with different tax rates than the United States, particularly Ireland and Switzerland, as well as Singapore and Puerto Rico which operate under tax incentive grants (which begin to expire in 2022), where the earnings had been indefinitely reinvested, thereby yielding a favorable impact on the effective tax rate compared with the U.S. statutory rate of 21% in 2019 and 2018 and 35% in 2017. The foreign earnings tax rate differentials do not include the impact of intangible asset impairment charges, amortization of purchase accounting adjustments or restructuring costs. These items are presented separately as they each represent a significant, separately disclosed pretax cost or charge, and a substantial portion of each of these items relates to jurisdictions with lower tax rates than the United States. Therefore, the impact of recording these expense items in lower tax rate jurisdictions is an unfavorable impact on the effective tax rate compared to the U.S. statutory rate.

Income before taxes consisted of:

Years Ended December 31	2019		2018		2017
Domestic	$	439	$	3,717	$	3,483
Foreign	11,025		4,984		3,038
	$	11,464	$	8,701	$	6,521

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Taxes on income consisted of:

Years Ended December 31	2019			2018			2017
Current provision
Federal	$	514		$	536		$	5,585
Foreign	1,806			2,281			1,229
State	(77		)	200			(90		)
	2,243			3,017			6,724
Deferred provision
Federal	(330		)	(402		)	(2,958		)
Foreign	(240		)	(64		)	75
State	14			(43		)	262
	(556		)	(509		)	(2,621		)
	$	1,687		$	2,508		$	4,103

Deferred income taxes at December 31 consisted of:

	2019					2018
	Assets			Liabilities		Assets			Liabilities
Product intangibles and licenses	$	442		$	1,778	$	720		$	1,640
Inventory related	32			354		32			377
Accelerated depreciation	—			594		—			582
Pensions and other postretirement benefits	785			191		565			151
Compensation related	322			—		291			—
Unrecognized tax benefits	109			—		174			—
Net operating losses and other tax credit carryforwards	897			—		715			—
Other	764			84		621			66
Subtotal	3,351			3,001		3,118			2,816
Valuation allowance	(1,100		)			(1,348		)
Total deferred taxes	$	2,251		$	3,001	$	1,770		$	2,816
Net deferred income taxes				$	750				$	1,046
Recognized as:
Other Assets	$	719				$	656
Deferred Income Taxes				$	1,470				$	1,702

The Company has net operating loss (NOL) carryforwards in several jurisdictions. As of December 31, 2019, $762 million of deferred taxes on NOL carryforwards relate to foreign jurisdictions. Valuation allowances of $1.1 billion have been established on these foreign NOL carryforwards and other foreign deferred tax assets. In addition, the Company has $135 million of deferred tax assets relating to various U.S. tax credit carryforwards and NOL carryforwards, all of which are expected to be fully utilized prior to expiry.

Income taxes paid in 2019, 2018 and 2017 were $4.5 billion, $1.5 billion and $4.9 billion, respectively. Tax benefits relating to stock option exercises were $65 million in 2019, $77 million in 2018 and $73 million in 2017.

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	2019			2018			2017
Balance January 1	$	1,893		$	1,723		$	3,494
Additions related to current year positions	199			221			146
Additions related to prior year positions	46			142			520
Reductions for tax positions of prior years (1)	(454		)	(73		)	(1,038		)
Settlements (1)	(356		)	(91		)	(1,388		)
Lapse of statute of limitations (2)	(103		)	(29		)	(11		)
Balance December 31	$	1,225		$	1,893		$	1,723

⁽¹⁾  Amounts reflect the settlements with the IRS as discussed below.

⁽²⁾ Amount in 2019 includes $78 million related to the divestiture of Merck’s Consumer Care business in 2014.

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If the Company were to recognize the unrecognized tax benefits of $1.2 billion at December 31, 2019, the income tax provision would reflect a favorable net impact of $1.1 billion.

The Company is under examination by numerous tax authorities in various jurisdictions globally. The Company believes that it is reasonably possible that the total amount of unrecognized tax benefits as of December 31, 2019 could decrease by up to approximately $40 million in the next 12 months as a result of various audit closures, settlements or the expiration of the statute of limitations. 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.

Interest and penalties associated with uncertain tax positions amounted to a (benefit) expense of $(101) million in 2019, $51 million in 2018 and $183 million in 2017. These amounts reflect the beneficial impacts of various tax settlements, including those discussed below. Liabilities for accrued interest and penalties were $243 million and $372 million as of December 31, 2019 and 2018, respectively.

In 2019, the Internal Revenue Service (IRS) concluded its examinations of Merck’s 2012-2014 U.S. federal income tax returns. As a result, the Company was required to make a payment of $107 million. The Company’s reserves for unrecognized tax benefits for the years under examination exceeded the adjustments relating to this examination period and therefore the Company recorded a $364 million net tax benefit in 2019. This net benefit reflects reductions in reserves for unrecognized tax benefits for tax positions relating to the years that were under examination, partially offset by additional reserves for tax positions not previously reserved for.

In 2017, the IRS concluded its examinations of Merck’s 2006-2011 U.S. federal income tax returns. As a result, the Company was required to make a payment of approximately $2.8 billion. The Company’s reserves for unrecognized tax benefits for the years under examination exceeded the adjustments relating to this examination period and therefore the Company recorded a net $234 million tax benefit in 2017. This net benefit reflects reductions in reserves for unrecognized tax benefits for tax positions relating to the years that were under examination, partially offset by additional reserves for tax positions not previously reserved for, as well as adjustments to reserves for unrecognized tax benefits relating to years which remain open to examination that are affected by this settlement.

The IRS is currently conducting examinations of the Company’s tax returns for the years 2015 and 2016. In addition, various state and foreign tax examinations are in progress and for these jurisdictions, the Company’s income tax returns are open for examination for the period 2003 through 2019.

16.    Earnings per Share

The calculations of earnings per share (shares in millions) are as follows:

Years Ended December 31	2019		2018		2017
Net income attributable to Merck & Co., Inc.	$	9,843	$	6,220	$	2,394
Average common shares outstanding	2,565		2,664		2,730
Common shares issuable (1)	15		15		18
Average common shares outstanding assuming dilution	2,580		2,679		2,748
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders	$	3.84	$	2.34	$	0.88
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders	$	3.81	$	2.32	$	0.87

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

In 2019, 2018 and 2017, 2 million, 6 million and 5 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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17.   Other Comprehensive Income (Loss)

Changes in AOCI by component are as follows:

	Derivatives				Investments				Employee Benefit Plans				Cumulative Translation Adjustment			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2017, net of taxes	$	338			$	(3	)		$	(3,206	)		$	(2,355	)	$	(5,226	)
Other comprehensive income (loss) before reclassification adjustments, pretax	(561		)		212				438				235			324
Tax	207				(35		)		(106		)		166			232
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(354		)		177				332				401			556
Reclassification adjustments, pretax	(141		)	(1)	(291		)	(2)	117			(3)	—			(315		)
Tax	49				56				(30		)		—			75
Reclassification adjustments, net of taxes	(92		)		(235		)		87				—			(240		)
Other comprehensive income (loss), net of taxes	(446		)		(58		)		419				401			316
Balance at December 31, 2017, net of taxes	(108		)		(61		)		(2,787		)		(1,954		)	(4,910		)
Other comprehensive income (loss) before reclassification adjustments, pretax	228				(108		)		(728		)		(84		)	(692		)
Tax	(55		)		1				169				(139		)	(24		)
Other comprehensive income (loss) before reclassification adjustments, net of taxes	173				(107		)		(559		)		(223		)	(716		)
Reclassification adjustments, pretax	157			(1)	97			(2)	170			(3)	—			424
Tax	(33		)		—				(36		)		—			(69		)
Reclassification adjustments, net of taxes	124				97				134				—			355
Other comprehensive income (loss), net of taxes	297				(10		)		(425		)		(223		)	(361		)
Adoption of ASU 2018-02	(23		)		1				(344		)		100			(266		)
Adoption of ASU 2016-01	—				(8		)		—				—			(8		)
Balance at December 31, 2018, net of taxes	166				(78		)		(3,556		)	(4)	(2,077		)	(5,545		)
Other comprehensive income (loss) before reclassification adjustments, pretax	86				140				(948		)		112			(610		)
Tax	(15		)		—				192				(16		)	161
Other comprehensive income (loss) before reclassification adjustments, net of taxes	71				140				(756		)		96			(449		)
Reclassification adjustments, pretax	(261		)	(1)	(44		)	(2)	66			(3)	—			(239		)
Tax	55				—				(15		)		—			40
Reclassification adjustments, net of taxes	(206		)		(44		)		51				—			(199		)
Other comprehensive income (loss), net of taxes	(135		)		96				(705		)		96			(648		)
Balance at December 31, 2019, net of taxes	$	31			$	18			$	(4,261	)	(4)	$	(1,981	)	$	(6,193	)

⁽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. In 2017, these amounts included both investments in debt and equity securities; however, as a result of the adoption of ASU 2016-01 in 2018, these amounts relate only to investments in available-for-sale debt securities.

⁽³⁾  Includes net amortization of prior service cost and actuarial gains and losses included in net periodic benefit cost (see Note 13).

⁽⁴⁾  Includes pension plan net loss of $5.1 billion and $4.4 billion at December 31, 2019 and 2018, respectively, and other postretirement benefit plan net gain of $247 million and $170 million at December 31, 2019 and 2018, respectively, as well as pension plan prior service credit of $263 million and $314 million at December 31, 2019 and 2018, respectively, and other postretirement benefit plan prior service credit of $305 million and $375 million at December 31, 2019 and 2018, respectively.

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18.    Segment Reporting

The Company’s operations are principally managed on a products basis and include four operating segments, which are the Pharmaceutical, Animal Health, Healthcare Services and Alliances segments. The Pharmaceutical and Animal Health segments are the only reportable segments.

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. Human health 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. During 2019, as a result of changes to the Company’s internal reporting structure, certain costs that were previously included in the Pharmaceutical segment are now being included as part of non-segment expenses within Merck Research Laboratories. Prior period Pharmaceutical segment profits have been recast to reflect these changes on a comparable basis.

The Animal Health segment discovers, develops, manufactures and markets a wide range of veterinary pharmaceutical and vaccine products, as well as health management solutions and services, for the prevention, treatment and control of disease in all major livestock and companion animal species. The Company also offers an extensive suite of digitally connected identification, traceability and monitoring products. The Company sells its products to veterinarians, distributors and animal producers.

The 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. The Company has recently sold certain businesses in the Healthcare Services segment and is in the process of divesting the remaining businesses.

The Alliances segment primarily includes activity from the Company’s relationship with AstraZeneca LP related to sales of Nexium and Prilosec, which concluded in 2018.

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Sales of the Company’s products were as follows:

Years Ended December 31	2019						2018						2017
	U.S.		Int’l		Total		U.S.		Int’l		Total		U.S.		Int’l		Total
Pharmaceutical:
Oncology
Keytruda	$	6,305	$	4,779	$	11,084	$	4,150	$	3,021	$	7,171	$	2,309	$	1,500	$	3,809
Alliance revenue - Lynparza (1)	269		176		444		127		61		187		—		20		20
Alliance revenue - Lenvima (1)	239		165		404		95		54		149		—		—		—
Emend	183		205		388		312		210		522		342		213		556
Vaccines
Gardasil/Gardasil 9	1,831		1,905		3,737		1,873		1,279		3,151		1,565		743		2,308
ProQuad/M-M-R II/Varivax	1,683		592		2,275		1,430		368		1,798		1,374		303		1,676
Pneumovax 23	679		247		926		627		281		907		581		240		821
RotaTeq	506		284		791		496		232		728		481		204		686
Vaqta	130		108		238		127		112		239		94		124		218
Hospital Acute Care
Bridion	533		598		1,131		386		531		917		239		465		704
Noxafil	282		380		662		353		389		742		309		327		636
Primaxin	2		271		273		7		258		265		10		270		280
Invanz	30		233		263		253		243		496		361		241		602
Cubicin	92		165		257		191		176		367		189		193		382
Cancidas	6		242		249		12		314		326		20		402		422
Immunology
Simponi	—		830		830		—		893		893		—		819		819
Remicade	—		411		411		—		582		582		—		837		837
Neuroscience
Belsomra	92		214		306		96		164		260		98		112		210
Virology
Isentress/Isentress HD	398		576		975		513		627		1,140		565		639		1,204
Zepatier	118		252		370		8		447		455		771		888		1,660
Cardiovascular
Zetia	14		575		590		45		813		857		352		992		1,344
Vytorin	16		269		285		10		487		497		124		627		751
Atozet	—		391		391		—		347		347		—		225		225
Adempas	—		419		419		—		329		329		—		300		300
Diabetes
Januvia	1,724		1,758		3,482		1,969		1,718		3,686		2,153		1,584		3,737
Janumet	589		1,452		2,041		811		1,417		2,228		863		1,296		2,158
Women’s Health
NuvaRing	742		136		879		722		180		902		564		197		761
Implanon/Nexplanon	568		219		787		495		208		703		496		191		686
Diversified Brands
Singulair	29		669		698		20		688		708		40		692		732
Cozaar/Hyzaar	24		418		442		23		431		453		18		466		484
Nasonex	9		284		293		23		353		376		54		333		387
Arcoxia	—		288		288		—		335		335		—		363		363
Follistim AQ	103		138		241		115		153		268		123		174		298
Other pharmaceutical (2)	1,563		3,343		4,901		1,319		3,380		4,705		1,759		3,556		5,314
Total Pharmaceutical segment sales	18,759		22,992		41,751		16,608		21,081		37,689		15,854		19,536		35,390
Animal Health:
Livestock	582		2,201		2,784		528		2,102		2,630		471		2,013		2,484
Companion Animals	724		885		1,609		710		872		1,582		619		772		1,391
Total Animal Health segment sales	1,306		3,086		4,393		1,238		2,974		4,212		1,090		2,785		3,875
Other segment sales (3)	174		1		175		248		2		250		396		1		397
Total segment sales	20,239		26,079		46,319		18,094		24,057		42,151		17,340		22,322		39,662
Other (4)	86		436		521		118		26		143		84		376		460
	$	20,325	$	26,515	$	46,840	$	18,212	$	24,083	$	42,294	$	17,424	$	22,698	$	40,122

U.S. plus international may not equal total due to rounding.

⁽¹⁾  Alliance revenue represents Merck’s share of profits, which are product sales net of cost of sales and commercialization costs (see Note 4).

⁽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 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 2019, 2018 and 2017 also includes approximately $80 million, $95 million and $85 million, respectively, related to the sale of the marketing rights to certain products.

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Consolidated sales by geographic area where derived are as follows:

Years Ended December 31	2019		2018		2017
United States	$	20,325	$	18,212	$	17,424
Europe, Middle East and Africa	12,707		12,213		11,478
Japan	3,583		3,212		3,122
China	3,207		2,184		1,586
Asia Pacific (other than Japan and China)	2,943		2,909		2,751
Latin America	2,469		2,415		2,339
Other	1,606		1,149		1,422
	$	46,840	$	42,294	$	40,122

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

Years Ended December 31	2019			2018			2017
Segment profits:
Pharmaceutical segment	$	28,324		$	24,871		$	23,018
Animal Health segment	1,609			1,659			1,552
Other segments	(7		)	103			275
Total segment profits	29,926			26,633			24,845
Other profits	363			6			26
Unallocated:
Interest income	274			343			385
Interest expense	(893		)	(772		)	(754		)
Depreciation and amortization	(1,573		)	(1,334		)	(1,378		)
Research and development	(9,499		)	(9,432		)	(10,004		)
Amortization of purchase accounting adjustments	(1,419		)	(2,664		)	(3,056		)
Restructuring costs	(638		)	(632		)	(776		)
Charge related to the termination of a collaboration with Samsung	—			(423		)	—
Loss on extinguishment of debt	—			—			(191		)
Other unallocated, net	(5,077		)	(3,024		)	(2,576		)
Income Before Taxes	$	11,464		$	8,701		$	6,521

Pharmaceutical segment profits are comprised of segment sales less standard costs, as well as selling, general and administrative expenses directly incurred by the segment. Animal Health segment profits are comprised of segment sales, less all cost of sales, as well as selling, general and administrative expenses and research and development costs directly incurred by the segment. For internal management reporting presented to the chief operating decision maker, Merck does not allocate the remaining cost of sales not included in segment profits as described above, research and development expenses incurred in Merck Research Laboratories, the Company’s research and development division that focuses on human health-related activities, 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 other intangible asset impairment charges, gains or losses on sales of businesses, expense or income related to changes in the estimated fair value of liabilities for contingent consideration, and other miscellaneous income or expense items.

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Equity (income) loss from affiliates and depreciation and amortization included in segment profits is as follows:

	Pharmaceutical		Animal Health		All Other		Total
Year Ended December 31, 2019
Included in segment profits:
Equity (income) loss from affiliates	$	—	$	—	$	—	$	—
Depreciation and amortization	137		109		10		256
Year Ended December 31, 2018
Included in segment profits:
Equity (income) loss from affiliates	$	4	$	—	$	—	$	4
Depreciation and amortization	243		82		10		335
Year Ended December 31, 2017
Included in segment profits:
Equity (income) loss from affiliates	$	7	$	—	$	—	$	7
Depreciation and amortization	125		75		12		212

Property, plant and equipment, net, by geographic area where located is as follows:

December 31	2019		2018		2017
United States	$	8,974	$	8,306	$	8,070
Europe, Middle East and Africa	4,767		3,706		3,151
Asia Pacific (other than Japan and China)	714		684		632
Latin America	266		264		271
China	174		167		150
Japan	152		159		158
Other	6		5		7
	$	15,053	$	13,291	$	12,439

The Company does not disaggregate assets on a products and services basis for internal management reporting and, therefore, such information is not presented.

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Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholders of Merck & Co., Inc.

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheet of Merck & Co., Inc. and its subsidiaries (the “Company”) as of December 31, 2019 and 2018, and the related consolidated statements of income, of comprehensive income, of equity and of cash flows for each of the three years in the period ended December 31, 2019, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company’s internal control over financial reporting as of December 31, 2019, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2019 and 2018, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2019 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2019, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

Basis for Opinions

The Company’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s Report on Internal Control Over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on the Company’s consolidated financial statements and on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed 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. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable

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assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Critical Audit Matters

The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that (i) relates to accounts or disclosures that are material to the consolidated financial statements and (ii) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Customer Discount Accruals in the U.S. - Medicaid, Managed Care and Medicare Part D Rebates

As described in Note 2 to the consolidated financial statements, the Company records certain variable consideration including discounts, which are estimated at the time of sale generally using the expected value method. Amounts accrued for aggregate customer discounts as of December 31, 2019 in the U.S. are $2.4 billion and are evaluated on a quarterly basis through comparison of information provided by the wholesalers, health maintenance organizations, pharmacy benefit managers, federal and state agencies, and other customers to the amounts accrued. Certain of these discounts take the form of rebates, which are amounts owed based upon definitive contractual agreements or legal requirements with private sector (Managed Care) 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. The provision for rebates is based on expected patient usage, as well as inventory levels in the distribution channel to determine the contractual obligation to the benefit providers. Management uses historical customer segment utilization mix, sales forecasts, changes to product mix and price, inventory levels in the distribution channel, government pricing calculations and prior payment history in order to estimate the expected provision.

The principal considerations for our determination that performing procedures relating to customer discount accruals in the U.S. - Medicaid, Managed Care, and Medicare Part D rebates is a critical audit matter are that there was significant judgment required by management with significant measurement uncertainty, as the calculation of the rebate accruals includes assumptions related to price and customer segment utilization, pertaining to forecasted customer claims that may not be fully paid until a subsequent period. This in turn led to a high degree of auditor judgment, subjectivity and effort in applying the procedures related to those assumptions.

Addressing the matter involved performing procedures and evaluating audit evidence in connection with forming our overall opinion on the consolidated financial statements. These procedures included testing the effectiveness of controls relating to customer discount accruals in the U.S. - Medicaid, Managed Care, and Medicare Part D rebates, including management’s controls over the assumptions used to estimate the corresponding rebate accruals. These procedures also included, among others, developing an independent estimate of the rebate accruals by utilizing third party data on customer segment utilization, changes to price, the terms of the specific rebate programs, and the historical trend of actual rebate claims paid. The independent estimate was compared to the rebate accruals recorded by management to evaluate the reasonableness of the estimate. Additionally, these procedures included testing actual rebate claims paid and evaluating the contractual terms of the Company’s rebate agreements.

 

PricewaterhouseCoopers LLP

Florham Park, New Jersey

February 26, 2020

We have served as the Company’s auditor since 2002.

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(b) Supplementary Data

Selected quarterly financial data for 2019 and 2018 are contained in the Condensed Interim Financial Data table below.

Condensed Interim Financial Data (Unaudited)

($ in millions except per share amounts)	4th Q			3rd Q (1)			2nd Q			1st Q (2)
2019 (3)
Sales	$	11,868		$	12,397		$	11,760		$	10,816
Cost of sales	3,669			3,990			3,401			3,052
Selling, general and administrative	2,888			2,589			2,712			2,425
Research and development	2,548			3,204			2,189			1,931
Restructuring costs	194			232			59			153
Other (income) expense, net	(223		)	35			140			188
Income before taxes	2,792			2,347			3,259			3,067
Net income attributable to Merck & Co., Inc.	2,357			1,901			2,670			2,915
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders	$	0.93		$	0.74		$	1.04		$	1.13
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders	$	0.92		$	0.74		$	1.03		$	1.12
2018 (3)
Sales	$	10,998		$	10,794		$	10,465		$	10,037
Cost of sales	3,289			3,619			3,417			3,184
Selling, general and administrative	2,643			2,443			2,508			2,508
Research and development	2,214			2,068			2,274			3,196
Restructuring costs	138			171			228			95
Other (income) expense, net	110			(172		)	(48		)	(291		)
Income before taxes	2,604			2,665			2,086			1,345
Net income attributable to Merck & Co., Inc.	1,827			1,950			1,707			736
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders	$	0.70		$	0.73		$	0.64		$	0.27
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders	$	0.69		$	0.73		$	0.63		$	0.27

⁽¹⁾  Amounts for 2019 include a charge related to the acquisition of Peloton Therapeutics, Inc. (see Note 3).

⁽²⁾  Amounts for 2018 include a charge related to the formation of a collaboration with Eisai (see Note 4).

⁽³⁾ Amounts for 2019 and 2018 reflect acquisition and divestiture-related costs (see Note 8) and the impact of restructuring actions (see Note 5).

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Item 9.     Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.

Not applicable.

Item 9A.   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. Based on their evaluation, as of the end of the period covered by this Form 10-K, the Company’s Chief Executive Officer and Chief Financial Officer have concluded that the Company’s disclosure controls and procedures (as defined in Rules 13a-15(e) or 15d-15(e) under the Securities Exchange Act of 1934, as amended (the Act)) are effective. For the fourth quarter of 2019, there have been no changes in internal control over financial reporting that materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

Management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rule 13a-15(f) of the Act. Management conducted an evaluation of the effectiveness of internal control over financial reporting based on the framework in Internal Control — Integrated Framework issued in 2013 by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that internal control over financial reporting was effective as of December 31, 2019. PricewaterhouseCoopers LLP, an independent registered public accounting firm, has performed its own assessment of the effectiveness of the Company’s internal control over financial reporting and its attestation report is included in this Form 10-K filing.

Management’s Report

Management’s Responsibility for Financial Statements

Responsibility for the integrity and objectivity of the Company’s financial statements rests with management. The financial statements report on management’s stewardship of Company assets. These statements are prepared in conformity with generally accepted accounting principles and, accordingly, include amounts that are based on management’s best estimates and judgments. Nonfinancial information included in the Annual Report on Form 10-K has also been prepared by management and is consistent with the financial statements.

To assure that financial information is reliable and assets are safeguarded, management maintains an effective system of internal controls and procedures, important elements of which include: careful selection, training and development of operating and financial managers; an organization that provides appropriate division of responsibility; and communications aimed at assuring that Company policies and procedures are understood throughout the organization. A staff of internal auditors regularly monitors the adequacy and application of internal controls on a worldwide basis.

To ensure that personnel continue to understand the system of internal controls and procedures, and policies concerning good and prudent business practices, annually all employees of the Company are required to complete Code of Conduct training. This training reinforces the importance and understanding of internal controls by reviewing key corporate policies, procedures and systems. In addition, the Company has compliance programs, including an ethical business practices program to reinforce the Company’s long-standing commitment to high ethical standards in the conduct of its business.

The financial statements and other financial information included in the Annual Report on Form 10-K fairly present, in all material respects, the Company’s financial condition, results of operations and cash flows. Our formal certification to the Securities and Exchange Commission is included in this Form 10-K filing.

Management’s Report on Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rule 13a-15(f) under the Securities Exchange Act of 1934. The Company’s internal control over financial reporting is designed 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 in the United States of America. Management conducted an evaluation of the effectiveness of internal control over financial reporting based on the framework in Internal Control — Integrated Framework issued

127

in 2013 by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that internal control over financial reporting was effective as of December 31, 2019.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

The effectiveness of the Company’s internal control over financial reporting as of December 31, 2019, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which appears herein.

Kenneth C. Frazier	Robert M. Davis
Chairman, President and Chief Executive Officer	Executive Vice President, Global Services, and Chief Financial Officer

Item 9B. Other Information.

None.

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PART III

Item 10. Directors, Executive Officers and Corporate Governance.

The required information on directors and nominees is incorporated by reference from the discussion under Proposal 1. Election of Directors of the Company’s Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020. Information on executive officers is set forth in Part I of this document on page 35.

The required information on compliance with Section 16(a) of the Securities Exchange Act of 1934, if applicable, is incorporated by reference from the discussion under the heading “Stock Ownership Information” of the Company’s Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020.

The Company has a Code of Conduct — Our Values and Standards applicable to all employees, including the principal executive officer, principal financial officer, principal accounting officer and Controller. The Code of Conduct is available on the Company’s website at http://www.msd.com/about/how-we-operate/code-of-conduct/values-and-standards.html. The Company intends to disclose future amendments to certain provisions of the Code of Conduct, and waivers of the Code of Conduct granted to executive officers and directors, if any, on the website within four business days following the date of any amendment or waiver. Every Merck employee is responsible for adhering to business practices that are in accordance with the law and with ethical principles that reflect the highest standards of corporate and individual behavior.

The required information on the identification of the audit committee and the audit committee financial expert is incorporated by reference from the discussion under the heading “Board Meetings and Committees” of the Company’s Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020.

Item 11. Executive Compensation.

The information required on executive compensation is incorporated by reference from the discussion under the headings “Compensation Discussion and Analysis,” “Summary Compensation Table,” “All Other Compensation” table, “Grants of Plan-Based Awards” table, “Outstanding Equity Awards” table, “Option Exercises and Stock Vested” table, “Pension Benefits” table, “Nonqualified Deferred Compensation” table, Potential Payments Upon Termination or a Change in Control, including the discussion under the subheadings “Separation” and “Change in Control,” as well as all footnote information to the various tables, of the Company’s Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020.

The required information on director compensation is incorporated by reference from the discussion under the heading “Director Compensation” and related “Director Compensation” table and “Schedule of Director Fees” table of the Company’s Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020.

The required information under the headings “Compensation and Benefits Committee Interlocks and Insider Participation” and “Compensation and Benefits Committee Report” is incorporated by reference from the Company’s Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020.

129

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Information with respect to security ownership of certain beneficial owners and management is incorporated by reference from the discussion under the heading “Stock Ownership Information” of the Company’s Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020.

Equity Compensation Plan Information

The following table summarizes information about the options, warrants and rights and other equity compensation under the Company’s equity compensation plans as of the close of business on December 31, 2019. The table does not include information about tax qualified plans such as the Merck U.S. Savings Plan.

Plan Category	Number of securities to be issued upon exercise of outstanding options, warrants and rights (a)	Weighted-average exercise price of outstanding options, warrants and rights (b)		Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a)) (c)
Equity compensation plans approved by security holders(1)	17,867,551(2)	$	59.88	110,842,998
Equity compensation plans not approved by security holders	—	—		—
Total	17,867,551	$	59.88	110,842,998

⁽¹⁾  Includes options to purchase shares of Company Common Stock and other rights under the following shareholder-approved plans: the Merck & Co., Inc. 2010 and 2019 Incentive Stock Plans, and the Merck & Co., Inc. 2010 Non-Employee Directors Stock Option Plan.

⁽²⁾  Excludes approximately 13,527,086 shares of restricted stock units and 1,927,145 performance share units (assuming maximum payouts) under the Merck Sharp & Dohme 2004, 2007 and 2010 Incentive Stock Plans. Also excludes 197,485 shares of phantom stock deferred under the MSD Employee Deferral Program and 557,132 shares of phantom stock deferred under the Merck & Co., Inc. Plan for Deferred Payment of Directors’ Compensation.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

The required information on transactions with related persons is incorporated by reference from the discussion under the heading “Related Person Transactions” of the Company’s Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020.

The required information on director independence is incorporated by reference from the discussion under the heading “Independence of Directors” of the Company’s Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020.

Item 14. Principal Accountant Fees and Services.

The information required for this item is incorporated by reference from the discussion under Proposal 3. Ratification of Appointment of Independent Registered Public Accounting Firm for 2020 beginning with the caption “Pre-Approval Policy for Services of Independent Registered Public Accounting Firm” through “Fees for Services Provided by the Independent Registered Public Accounting Firm” of the Company’s Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020.

130

PART IV

Item 15. Exhibits and Financial Statement Schedules.

(a)    The following documents are filed as part of this Form 10-K

1.    Financial Statements

Consolidated statement of income for the years ended December 31, 2019, 2018 and 2017

Consolidated statement of comprehensive income for the years ended December 31, 2019, 2018 and 2017

Consolidated balance sheet as of December 31, 2019 and 2018

Consolidated statement of equity for the years ended December 31, 2019, 2018 and 2017

Consolidated statement of cash flows for the years ended December 31, 2019, 2018 and 2017

Notes to consolidated financial statements

Report of PricewaterhouseCoopers LLP, independent registered public accounting firm

2.    Financial Statement Schedules

Schedules are omitted because they are either not required or not applicable.

Financial statements of affiliates carried on the equity basis have been omitted because, considered individually or in the aggregate, such affiliates do not constitute a significant subsidiary.

131

3.    Exhibits

Exhibit Number		Description
3.1	—	Restated Certificate of Incorporation of Merck & Co., Inc. (November 3, 2009) — Incorporated by reference to Merck & Co., Inc.’s Current Report on Form 8-K filed November 4, 2009 (No. 1-6571)
3.2	—	By-Laws of Merck & Co., Inc. (effective July 22, 2015) — Incorporated by reference to Merck & Co., Inc.’s Current Report on Form 8-K filed July 28, 2015 (No. 1-6571)
4.1	—	Indenture, dated as of April 1, 1991, between Merck Sharp & Dohme Corp. (f/k/a Schering Corporation) and U.S. Bank Trust National Association (as successor to Morgan Guaranty Trust Company of New York), as Trustee (the 1991 Indenture) — Incorporated by reference to Exhibit 4 to MSD’s Registration Statement on Form S-3 (No. 33-39349)
4.2	—	First Supplemental Indenture to the 1991 Indenture, dated as of October 1, 1997 — Incorporated by reference to Exhibit 4(b) to MSD’s Registration Statement on Form S-3 filed September 25, 1997 (No. 333-36383)
4.3	—	Second Supplemental Indenture to the 1991 Indenture, dated November 3, 2009 — Incorporated by reference to Exhibit 4.3 to Merck & Co., Inc.’s Current Report on Form 8-K filed November 4, 2009 (No.1-6571)
4.4	—	Third Supplemental Indenture to the 1991 Indenture, dated May 1, 2012 — Incorporated by reference to Exhibit 4.1 to Merck & Co., Inc.’s Form 10-Q Quarterly Report for the period ended March 31, 2012 (No. 1-6571)
4.5	—	Indenture, dated November 26, 2003, between Merck & Co., Inc. (f/k/a Schering-Plough Corporation) and The Bank of New York as Trustee (the 2003 Indenture) — Incorporated by reference to Exhibit 4.1 to Schering-Plough’s Current Report on Form 8‑K filed November 28, 2003 (No. 1-6571)
4.6	—	Second Supplemental Indenture to the 2003 Indenture (including Form of Note), dated November 26, 2003 — Incorporated by reference to Exhibit 4.3 to Schering-Plough’s Current Report on Form 8‑K filed November 28, 2003 (No. 1-6571)
4.7	—	Third Supplemental Indenture to the 2003 Indenture (including Form of Note), dated September 17, 2007 — Incorporated by reference to Exhibit 4.1 to Schering-Plough’s Current Report on Form 8‑K filed September 17, 2007 (No. 1-6571)

132

Exhibit Number		Description
4.8	—	Fifth Supplemental Indenture to the 2003 Indenture, dated November 3, 2009 — Incorporated by reference to Exhibit 4.4 to Merck & Co., Inc.’s Current Report on Form 8-K filed November 4, 2009 (No. 1-6571)
4.9	—	Indenture, dated as of January 6, 2010, between Merck & Co., Inc. and U.S. Bank Trust National Association, as Trustee — Incorporated by reference to Exhibit 4.1 to Merck & Co., Inc.’s Current Report on Form 8-K filed December 10, 2010 (No. 1-6571)
4.10	—	2.900% Notes due 2024 Officers’ Certificate of the Company dated March 7, 2019, including form of the 2024 Notes - Incorporated by reference to Exhibit 4.1 to Merck & Co., Inc.’s Current Report on Form 8-K filed March 7, 2019 (No. 1-6571)
4.11	—	3.400% Notes due 2029 Officers’ Certificate of the Company dated March 7, 2019, including form of the 2029 Notes - Incorporated by reference to Exhibit 4.2 to Merck & Co., Inc.’s Current Report on Form 8-K filed March 7, 2019 (No. 1-6571)
4.12	—	3.900% Notes due 2039 Officers’ Certificate of the Company dated March 7, 2019, including form of the 2039 Notes - Incorporated by reference to Exhibit 4.3 to Merck & Co., Inc.’s Current Report on Form 8-K filed March 7, 2019 (No. 1-6571)
4.13	—	4.000% Notes due 2049 Officers’ Certificate of the Company dated March 7, 2019, including form of the 2049 Notes - Incorporated by reference to Exhibit 4.4 to Merck & Co., Inc.’s Current Report on Form 8-K filed March 7, 2019 (No. 1-6571)
*10.1	—	Merck & Co., Inc. Executive Incentive Plan (as amended and restated effective June 1, 2015) — Incorporated by reference to Merck & Co., Inc.’s Schedule 14A filed April 13, 2015 (No. 1-6571)
*10.2	—	Merck & Co., Inc. Deferral Program Including the Base Salary Deferral Plan (Amended and Restated effective December 1, 2019)
*10.3	—	Merck & Co., Inc. 2010 Incentive Stock Plan (as amended and restated June 1, 2015) — Incorporated by reference to Merck & Co., Inc.’s Schedule 14A filed April 13, 2015 (No. 1-6571)
*10.4	—	Form of stock option terms for 2011 quarterly and annual non-qualified option grants under the Merck & Co., Inc. 2010 Incentive Stock Plan — Incorporated by reference to Exhibit 10.2 to Merck & Co., Inc.’s Form 10‑Q Quarterly Report for the period ended March 31, 2011 filed May 9, 2011 (No. 1-6571)
*10.5	—	Form of stock option terms for 2012 quarterly and annual non-qualified option grants under the Merck & Co., Inc. 2010 Incentive Stock Plan — Incorporated by reference to Exhibit 10.20 to Merck & Co., Inc.’s Form 10‑K Annual Report for the fiscal year ended December 31, 2011 filed February 28, 2012 (No. 1-6571)
*10.6	—	Form of stock option terms for 2013 quarterly and annual non-qualified option grants under the Merck & Co., Inc. 2010 Incentive Stock Plan — Incorporated by reference to Exhibit 10.19 to Merck & Co., Inc.’s Form 10-K Annual Report for the fiscal year ended December 31, 2012 filed February 28, 2013 (No. 1-6571)
*10.7	—	Form of stock option terms for 2014 quarterly and annual non-qualified option grants under the Merck & Co., Inc. 2010 Incentive Stock Plan — Incorporated by reference to Exhibit 10.18 to Merck & Co., Inc.’s Form 10-K Annual Report for the fiscal year ended December 31, 2014 filed February 27, 2015 (No. 1-6571)
*10.8	—	Form of stock option terms for 2015 quarterly and annual non-qualified option grants under the Merck & Co., Inc. 2010 Incentive Stock Plan — Incorporated by reference to Exhibit 10.20 to Merck & Co., Inc.’s Form 10-K Annual Report for the fiscal year ended December 31, 2015 filed February 26, 2016 (No. 1-6571)
*10.9	—	Form of stock option terms for 2018 quarterly and annual non-qualified option grants under the Merck & Co., Inc. 2010 Incentive Stock Plan — Incorporated by referent to Exhibit 10.12 to Merck & Co., Inc.’s Form 10-K Annual Report for the fiscal year ended December 31, 2017 filed February 27, 2018 (No. 1-6571)

133

Exhibit Number		Description
*10.10	—	Form of stock option terms for 2016 quarterly and annual non-qualified option grants under the Merck & Co., Inc. 2010 Incentive Stock Plan — Incorporated by reference to Exhibit 10.19 to Merck & Co., Inc.’s Form 10-K Annual Report for the fiscal year ended December 31, 2016 filed February 28, 2017 (No. 1-6571)
*10.11	—	Form of restricted stock unit terms for 2018 quarterly and annual grants under the Merck & Co., Inc. 2010 Incentive Stock Plan — Incorporated by reference to Exhibit 10.17 to Merck & Co., Inc.’s Form 10-K Annual Report for the fiscal year ended December 31, 2017 filed on February 28, 2018 (No. 1-6571)
*10.12	—	2018 Performance Share Unit Award Terms under the Merck & Co., Inc. 2010 Stock Incentive Plan — Incorporated by reference to Exhibit 10 to Merck & Co., Inc.’s Current Report on Form 10-Q Quarterly Report for the period ended March 31, 2018 filed May 8, 2018 (No. 1-6571)
*10.13	—	Merck & Co., Inc. 2019 Incentive Stock Plan - Incorporated by reference to Appendix C to Merck & Co., Inc.’s Schedule 14A filed April 8, 2019 (No. 1-6571)
*10.14	—	Merck & Co., Inc. Change in Control Separation Benefits Plan (effective as amended and restated, as of January 1, 2013) — Incorporated by reference to Exhibit 10.1 to Merck & Co., Inc.’s Current Report on Form 8‑K filed November 29, 2012 (No. 1-6571)
*10.15	—	Merck & Co., Inc. U.S. Separation Benefits Plan (amended and restated as of January 1, 2019) - Incorporated by reference to Exhibit 10.19 to Merck & Co., Inc.’s Form 10-K Annual Report for the fiscal year ended December 31, 2018 filed February 27, 2019 (No. 1-6571)
*10.16	—	Merck & Co., Inc. 2010 Non-Employee Directors Stock Option Plan (amended and restated as of December 1, 2010) — Incorporated by reference to Exhibit 10.17 to Merck & Co., Inc.’s Form 10‑K Annual Report for the fiscal year ended December 31, 2010 filed February 28, 2011 (No. 1-6571)
*10.17	—	Retirement Plan for the Directors of Merck & Co., Inc. (amended and restated June 21, 1996) —Incorporated by reference to Exhibit 10.C to MSD’s Form 10-Q Quarterly Report for the period ended June 30, 1996 filed August 13, 1996 (No. 1-3305)
*10.18	—	Merck & Co., Inc. Plan for Deferred Payment of Directors’ Compensation (Amended and Restated effective as of January 1, 2020)
10.19	—	Distribution agreement between Schering-Plough and Centocor, Inc., dated April 3, 1998 — Incorporated by reference to Exhibit 10(u) to Schering-Plough’s Amended 10-K for the year ended December 31, 2003 filed May 3, 2004 (No. 1-6571)†
10.20	—	Amendment Agreement to the Distribution Agreement between Centocor, Inc., CAN Development, LLC, and Schering-Plough (Ireland) Company — Incorporated by reference to Exhibit 10.1 to Schering-Plough’s Current Report on Form 8-K filed December 21, 2007 (No. 1-6571)†
10.21	—	Severance Agreement and General Release between Merck & Co., Inc. and Adam H. Schechter, dated December 1, 2018 - Incorporated by reference to Exhibit 10.27 to Merck & Co., Inc.’s Form 10-K Annual Report for the fiscal year ended December 31, 2018 filed February 27, 2019 (No. 1-6571)
10.22	—	Offer Letter between Merck & Co., Inc. and Jennifer Zachary, dated March 16, 2018 - Incorporated by reference to Exhibit 10.28 to Merck & Co., Inc.’s Form 10-K Annual Report for the fiscal year ended December 31, 2018 filed February 27, 2019 (No. 1-6571)
21	—	Subsidiaries of Merck & Co., Inc.
23	—	Consent of Independent Registered Public Accounting Firm
24.1	—	Power of Attorney
24.2	—	Certified Resolution of Board of Directors
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

134

Exhibit Number		Description
101.INS	—	XBRL Instance Document - The instance document does not appear in the interactive data file because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	—	XBRL Taxonomy Extension Schema Document.
101.CAL	—	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	—	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	—	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	—	XBRL Taxonomy Extension Presentation Linkbase Document.
104	—	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).

                

*	Management contract or compensatory plan or arrangement.
†	Certain portions of the exhibit have been omitted pursuant to a request for confidential treatment. The non-public information has been filed separately with the Securities and Exchange Commission pursuant to rule 24b-2 under the Securities Exchange Act of 1934, as amended.
	Long-term debt instruments under which the total amount of securities authorized does not exceed 10% of Merck & Co., Inc.’s total consolidated assets are not filed as exhibits to this report. Merck & Co., Inc. will furnish a copy of these agreements to the Securities and Exchange Commission on request.

Item 16.    Form 10-K Summary

Not applicable.

135

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) 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.

Dated:    February 26, 2020

MERCK & CO., INC.
By:	KENNETH C. FRAZIER
	(Chairman, President and Chief Executive Officer)
	By:	/s/ JENNIFER ZACHARY
		Jennifer Zachary
		(Attorney-in-Fact)

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

Signatures	Title	Date
KENNETH C. FRAZIER	Chairman, President and Chief Executive Officer; Principal Executive Officer; Director	February 26, 2020
ROBERT M. DAVIS	Executive Vice President, Global Services, and Chief Financial Officer; Principal Financial Officer	February 26, 2020
RITA A. KARACHUN	Senior Vice President Finance-Global Controller; Principal Accounting Officer	February 26, 2020
LESLIE A. BRUN	Director	February 26, 2020
THOMAS R. CECH	Director	February 26, 2020
MARY ELLEN COE	Director	February 26, 2020
PAMELA J. CRAIG	Director	February 26, 2020
THOMAS H. GLOCER	Director	February 26, 2020
ROCHELLE B. LAZARUS	Director	February 26, 2020
PAUL B. ROTHMAN	Director	February 26, 2020
PATRICIA F. RUSSO	Director	February 26, 2020
INGE G. THULIN	Director	February 26, 2020
WENDELL P. WEEKS	Director	February 26, 2020
PETER C. WENDELL	Director	February 26, 2020

Jennifer Zachary, by signing her name hereto, does hereby sign this document pursuant to powers of attorney duly executed by the persons named, filed with the Securities and Exchange Commission as an exhibit to this document, on behalf of such persons, all in the capacities and on the date stated, such persons including a majority of the directors of the Company.

By:	/S/ JENNIFER ZACHARY
	Jennifer Zachary
	(Attorney-in-Fact)

136

EX-10.2

Exhibit 10.2

MERCK & CO., INC.

DEFERRAL PROGRAM

Including the Base Salary Deferral Plan

(Amended and Restated effective December 1, 2019)

TABLE OF CONTENTS

Article I     Administration     1

Article II     Eligibility     1

Article III     Contributions to a Deferred Compensation Account     2

Article IV     Valuation of Deferred Compensation Accounts     5

Article V     Redesignation within a Deferred Compensation Account      7

Article VI     Distribution of Deferred Compensation Accounts     9

Article VII     Tax Withholding      11

Article VIII     Beneficiary Designations     11

Article IX    Amendments     11

Article X    No Assignment, Alienation     11

Article XI    Claims and Appeal Procedures     12

Article XII    Domestic Relations Orders     13

Article XIII    Effective Date     13

Schedule I     Deferral Program Investment Alternatives     15

Schedule II    Special Provisions Applicable to Medco Health Employees     16

MERCK & CO. INC.

DEFERRAL PROGRAM

The Deferral Program (the “Program”) is an unfunded arrangement intended to permit a select group of management employees of Merck & Co., Inc. (“Merck”) or its affiliate to defer income that would otherwise be immediately payable to them as annual base salary or under various incentive plans of Merck or its affiliates.

The Program is a “nonqualified deferred compensation plan” within the meaning of Section 409A (“Section 409A”) of the Internal Revenue Code of 1986, as amended (the “Code”).

Anything in the Program to the contrary notwithstanding, the Program shall be interpreted and operated in compliance with the requirements, if any, of Section 409A of the Code (or any successor thereto) as in effect from time to time, including but not limited to applicable regulations of the U.S. Department of the Treasury or Internal Revenue Service and Treas. Reg. Secs. 1.409A-1 through 1.409A-6 or any successor thereto. Any payment called for under the Program as of a designated date shall be made no later than a date within the same tax year of a participant, or by March 15 of the following year, if later (or such other dates as specified in Treas. Reg. Sec. 1.409A 3(d) or any successor thereto); provided further, that the participant is not permitted to change the taxable year of payment except in accordance with Article VI, Section F and Section 409A of the Code. Where the Program’s obligation to pay is unclear Merck, including a dispute about who is the proper beneficiary of a participant who dies, payment shall be made as soon as administratively feasible after the Program’s obligation becomes clear and at a time permitted by Treas. Reg. Sec. 1.409A-3(g)(4) or any successor thereto.

I. ADMINISTRATION

The Program is administered by the Compensation and Benefits Committee (“Committee”) of the Merck Board of Directors. The Committee is composed of non‑employee directors only. The Committee shall have responsibility for determining which investments will be available under the Program, and those investments shall be listed on Schedule I hereto. The Committee shall make all decisions affecting the timing, price or amount of any and all of the Deferred Compensation of Section 16 Officers, as defined below, other than rules of general application to all participants, but may otherwise delegate any of its authority under this Program.

II. ELIGIBILITY

A.    Eligible Employees

1.    Eligible Employees in General. An employee of Merck or its controlled group (the “Company Group”) is eligible to participate in the Program (an “Eligible Employee”) for a deferral of awards under the Annual Incentive Plan, Executive Incentive Plan or Sales Incentive Plan or similar plans as approved from time to time by the Committee if (a) his or her annual base compensation is at least $200,000 according to the Company payroll system applicable to him or her on November 1 of the year in which the election is made (or, for a newly hired employee only, his or her annualized base compensation is at least $200,000 when employment begins) (b) he or she is a regular full- or part-time employee of the Company or an affiliate who is eligible to make contributions to the Merck U.S. Savings Plan and (c) he or she is based in the U.S. and subject to U.S. income taxes.

1

2.    Base Salary Deferral. Eligible Employees who are Merck officers (“Section 16 Officers”) as defined in Rule 16(a)-1(f) of the Securities Exchange Act of 1934 as amended (the “Exchange Act”) are also eligible to defer under the Base Salary Deferral Plan. The Base Salary Deferred Plan as described below is a component of the Deferral Program contained entirely herein and is intended to permit eligible Section 16 Officers to defer a portion of their base salaries.

3.    Company Contribution Eligible Employees. An employee of the Company Group is eligible for Company Contribution Credits as described in Section D of Article III if (a) he or she is a regular full- or part-time employee of the Company or an affiliate who is eligible to make contributions to the Merck U.S. Savings Plan (b) he or she is based in the U.S. and subject to U.S. income taxes and (c) the employee’s base and Annual Incentive Plan, Executive Incentive Plan or Sales Incentive Plan compensation exceeds the applicable Code Section 401(a)(17) limit for that year (a “Company Contribution Eligible Employee”).

4.    Sign-On Bonus Employees. Effective after December 1, 2015, but before December 1, 2019, an employee newly hired into the Company Group in Band 700 or 800 was permitted within 30 days of the date employment commences, to elect to defer a sign-on bonus for compensation paid for services performed after such election.

5.    Discretion Reserved. Notwithstanding the foregoing, the Committee may permit, or refuse to permit, any member of a select group of management or highly compensated employees to participate in this Program other than excluded individuals described in Section B below.

B.    Excluded Individuals. Anything in the Program to the contrary notwithstanding, the following are not eligible to make an election or receive a Company Contribution Credit (as described below): any person who (1) is an independent contractor for the Company Group; (2) agrees or has agreed that he or she is an independent contractor for the Company Group; (3) has an agreement or understanding with any member of the Company Group that such person is not an employee, even if that person previously has been an employee; or (4) is employed by a temporary or other employment agency, regardless of the amount of control, supervision or training provided by the Company Group. The foregoing exclusion applies even if a court, agency or other authority rules that the person happens to be a common law employee of the Company Group. Also excluded are individuals who are included in a unit of employees covered by a collective bargaining agreement between employee representatives and one or more employers; provided, however, that such an employee may be an eligible employee during the period he or she is not covered by a collective bargaining agreement and during which he or she otherwise is eligible to participate according to Article II, Section A.

C.    Participation Continues.An eligible person who has made an election into the Program pursuant to Section A above or who is eligible for Company Contribution Credits pursuant to Section D of Article III shall be a participant for so long as he or she has an account balance. No such person can make an election to defer unless he or she is then eligible pursuant to Article II, Section A. If a person has made an election to defer but thereafter becomes ineligible to defer (for example, employment transfers to a position that is ineligible to participate in the Merck U.S. Savings Plan), the election nonetheless will be given effect.

2

III.CONTRIBUTIONS TO DEFERRED COMPENSATION ACCOUNTS

Amounts contributed or deferred pursuant to this Article III are known as “Deferred Compensation” and will be credited to the participant's “Deferred Compensation Account.” Deferred Compensation shall be accounted for in one account regardless of the plan (e.g., Base Salary Deferral or incentive plan) under which it was deferred, but a separate election to defer applies for each year for base salary, annual incentive, or grant of RSUs or PSUs, and records shall show each separate election. Further, for purposes of modifications to a distribution schedule, each separate election is eligible for such a modification. Only amounts described above may be deferred; stock option gains may not be deferred.

A.Initial Election to Defer

To make an election to defer Base Salary, Annual Incentive Plans or Restricted Stock Units (“RSUs”) and Performance Share Units (“PSUs”), an Eligible Employee must irrevocably elect to defer under the Program by the earlier of the time specified in Treas. Reg. Sec. 1.409A-2 or any successor thereto or:

1.     Base Salary Deferral Plan, prior to the end of the year preceding the year during which annual base salary exclusive of any bonus or any other compensation or allowance paid by the Company Group (“Annual Base Salary”) will be earned. The amount that may be deferred is

(a) Not less than 5 percent of Annual Base Salary and

(b) Not more than the lesser of

(1)    50 percent of Annual Base Salary or

(2)    The portion of the participant’s Annual Base Salary that exceeds the amount determined under Section 401(a)(17) of the Code

provided, however, that amounts may be expressed in relation to amounts that may be deducted by the Company Group under Section 162(m) of the Code.

2.    Annual Incentive Plans (such as the Annual Incentive Plan and the Executive Incentive Plan), prior to the commencement of the calendar year coincident with the performance year during which the bonus monies to be deferred will be earned (the “Applicable Performance Year”) or, effective December 1, 2019, prior to June 30 of the Applicable Performance Year (if the Applicable Performance Year is not the calendar year, the election must be made prior to the time required by Section 409A or such earlier time determined by the Company’s Executive Compensation department), provided: the minimum that may be deferred in any year under this Section IV.A.2. is $3,000; provided, however, this minimum does not apply for elections made during or after 2010.

3.    Annual Grants of RSUs and PSUs may be deferred prior to the commencement of the last year of the award period during which they will be earned. Other RSUs and PSUs may not be deferred. After 2008, RSUs and PSUs for which the deferral election is made after

3

grant must be deferred in compliance with the rules applicable to re-deferral (as opposed to initial elections) under Section 409A as described in Article VI, Section F. Deferrals of RSUs and PSUs must be made initially into the Merck Common Stock fund and may not thereafter be reallocated into any other investment alternative provided pursuant to Schedule I (a “Mutual Fund”). Effective November 1, 2010, no further elections of RSUs or PSUs will be permitted, but elections made prior to that date will be given effect.

4.    Sign-on Bonus amounts for Sign-on Bonus Employees, no later than the 30th day from the participant’s first day of employment, with respect to services performed after such election. Effective December 1, 2019, no further sign-on bonuses will be permitted to be deferred.

If a participant terminates employment or transfers to a class of employees that is ineligible to make a deferral election after having made a deferral election, the election will nevertheless be effected. If the Company Group pays an amount that it reasonably believes is or may be held to be a “substitute payment,” within the meaning of Treas. Reg. Sec. 1.409A-1(b)(9), for an amount that would have been deferred pursuant to the foregoing, that substitute payment also will be deferred according to the participant’s election.

B.Initial Election of Distribution Schedule

1.    Timing of Election

The Eligible Employeemust elect an initial distribution schedule when making the initial election pursuant to III.A., above.

2.    Distribution Schedule

An Eligible Employee may elect to have payments begin (a) in a particular year (whether or not employment has then ended); provided, however, this provision does not apply to Company Contributions or (b) in the year following the participant's “Separation from Service” as defined below, or (c) up to 15 years subsequent to the participant’s Separation from Service. Separation from Service means Separation from Service as defined in Treas. Reg. Sec. 1.409A-1(h) or any successor thereto and includes but is not limited to: retirement; separation due to lack of work; voluntary resignation; or involuntary termination of employment. It does not include termination of service due to death, transfer to another member of the Company Group or commencement of employment with a joint venture (as described below). A participant may elect a lump sum or a schedule of annual installments, up to a maximum of 15 annual installments.

3.    Manner of Elections

All elections under the Program shall be made with the Program’s designated record keeper (the “Record Keeper”) in the manner and in accordance with the process approved by the Company’s head of Human Resources Department from time to time.

4.    Default Designation

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Where a participant’s initial election of a distribution schedule is for any reason unclear to the Company (including but not limited to where a participant failed to elect when amounts will be distributed), the participant shall be deemed to have elected to receive distribution in a lump sum in the year following the year in which his or her Separation from Service occurs.

C.Election of Investment Alternatives

The participant shall designate, in accordance with procedures established by the Company for such designation, the portion (in multiples of 1 percent) of the Deferred Compensation to be allocated to any investment alternative available under this Program.

D.Company Contribution Credits.

With respect to each Plan Year after 2012, for a Company Contribution Eligible Employee the Company shall make contribution credits (“Company Contribution Credits”) to an account (the “Company Contribution Account”). The amount of the Company Contribution Credits shall be equal to 4.5 percent of such Eligible Employee’s Compensation for the Plan Year that exceeds the limit set forth in Section 401(a)(17) of the Code for that year; provided, however, that for a Company Contribution Eligible Employee who is eligible for the Transition Provisions of the Retirement Program as described in the Merck U.S. Savings Plan Summary Plan Description and apply to certain legacy Schering Plough employees, the Company Contribution Credit shall be 5.0 percent for the period during which that Company Contribution Eligible Employee is subject to the Transition Provisions (generally, the earlier of through 2019 or until employment terminates). Company Contribution Credits shall be credited to the participant’s Account on the same date on which the related employer contributions are made to the tax-qualified savings plan in which the Company Contribution Eligible Employee participates or such other date as the Committee shall determine.

IV. VALUATION OF DEFERRED COMPENSATION ACCOUNTS

The Deferral Program shall offer as investment alternatives (a) a fund of Merck Common Stock and (b) Mutual Funds.

A.    Merck Common Stock

1.     Initial Crediting

The amount allocated to Merck Common Stock shall be used to determine the number of full and partial shares of Merck Common Stock which such amount would purchase at the closing price of Merck Common Stock on the New York Stock Exchange (“NYSE”) on the date cash payments of base salary, for amounts deferred under the Base Salary Deferral Plan, or incentive awards, for amounts deferred under the various incentive plans, would otherwise be paid to the participant (the “Deferral Date”). The Company shall credit the participant's Deferred Compensation Account with the number of full and partial shares of Merck Common Stock so determined. However, at no time prior to the delivery of such shares shall any actual shares be purchased or earmarked for such Account and the participant shall not have any of the rights of a shareholder with respect to shares credited to his/her Deferred Compensation Account.

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2.     Dividends

The Company shall credit the participant's Deferred Compensation Account with the number of full and partial shares of Merck Common Stock purchasable at the closing price of Merck Common Stock on the NYSE as of the date each dividend is paid on the Common Stock, with the dividends that would have been paid on the number of shares credited to such Account (including pro rata dividends on any partial share) had the shares so credited then been issued and outstanding.

3.     Redesignations

The value of Merck Common Stock for purposes of redesignation shall be the closing price of Merck Common Stock on the NYSE on the first day the NYSE is open after the request is received by the Record Keeper.

4.    Distributions

Distributions of Merck Common Stock will be valued at the closing price of Merck Common Stock on the NYSE on the Distribution Date.

5.    Source of Shares

Shares of Merck Common Stock to be delivered under the provisions of this Program may be delivered by the Company from its authorized but unissued shares of Common Stock or from Common Stock held in the treasury. The Company also may, in its sole and nonreviewable discretion, purchase shares on public markets in order to make distributions under the Program.

6.    Adjustments

In the event of a reorganization, recapitalization, stock split, stock dividend, combination of shares, merger, consolidation, rights offering or any other change in the corporate structure or shares of the Company, the number and kind of shares of Merck Common Stock available under this Program or credited to participants’ Deferred Compensation Accounts shall be adjusted accordingly.

7.    Fair Market Value of Merck Common Stock

For purposes of valuation of Merck Common Stock, if Merck Common Stock is no longer traded on the NYSE, but is publicly traded on any other exchange, references to NYSE shall mean such other exchange. If Merck Common Stock is not publicly traded and if the Committee determines that a measurement of Merck Common Stock on any applicable date would not constitute fair market value, then the Committee shall decide on the date and method to determine fair market value, which shall be in accord with any requirements set forth under Section 409A or any successor thereto.

8.    Limits on Amount of Merck Common Stock

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Beginning January 1, 2013, participants cannot rebalance their account balance so that after the account rebalance, more than 20% of the value of their account is in the Merck Common Stock Fund. In addition, participants cannot elect an exchange into the Merck Common Stock Fund that will cause the balance in the Merck Common Stock Fund to exceed 20% of the total Account Balance. Participants will not be required to exchange out of the Merck Company Stock Fund if the fund balance exceeds 20% of their Account Balance, either through prior investment elections or relative fund performance.

B.    Mutual Funds

1.     Initial Crediting

The amount allocated to each Mutual Fund shall be used to determine the number of full and partial Mutual Fund shares that such amount would purchase at the closing net asset value of the Mutual Fund shares on the Deferral Date. The Company shall credit the participant’s Deferred Compensation Account with the number of full and partial Mutual Fund shares so determined. However, no actual Mutual Fund shares shall be purchased or earmarked for such Account, nor shall the participant have the rights of a shareholder with respect to such Mutual Fund shares.

2.    Dividends

The Company shall credit the participant’s Deferred Compensation Account with the number of full and partial Mutual Fund shares purchasable, at the closing net asset value of the Mutual Fund shares as of the date each dividend is paid on the Mutual Fund shares, with the dividends that would have been paid on the number of shares credited to such Account (including pro rata dividends on any partial share) had the shares then been owned by the participant for purposes of the above computation.

3.     Redesignations

The value of Mutual Fund shares for purposes of redesignation shall be the net asset value of such Mutual Fund at the close of business on the first day the NYSE is open after the request is received by the Record Keeper.

4.    Distributions

Mutual Fund distributions will be valued based on the closing net asset value of the Mutual Fund shares on the Distribution Date (as defined below).

5.    Adjustments

In the event of a reorganization, recapitalization, stock split, stock dividend, combination of shares, merger, consolidation, rights offering or any other change in the corporate structure or shares of a Mutual Fund, the number and kind of shares of that Mutual Fund credited to participants’ Deferred Compensation Accounts shall be adjusted accordingly.

6.     Default Designation

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Where a participant’s designation of investment alternatives is for any reason not clear (including but not limited to where a participant failed to make such an election), the participant shall be deemed to have designated deferrals into the life cycle, target or similar Mutual Fund with a target date closest to the date the participant attains age 65.

V. REDESIGNATION WITHIN A DEFERRED COMPENSATION ACCOUNT

A.    Basic Redesignation Rules

A participant, or the beneficiary or legal representative of a deceased participant, may redesignate amounts credited to a Deferred Compensation Account among the investments available under this Program in accordance with the following rules:

1.    Eligible Participants – All participants and beneficiaries may redesignate.

2.    Frequency and Timing – Redesignation shall be effective as of 4:00 p.m. E.T. on the first day the NYSE is open after the request is received by the Recordkeeper.

3.    Amount and Extent of Redesignation – Redesignation must be in 1% multiples of the investment from which redesignation is being made.

4.    Beneficiaries or Legal Representatives – The beneficiary or legal representative of a deceased participant may redesignate subject to the same rules as participants.

B.    Special Rules for Redesignation Into or Out of Merck Common Stock

1.    Frequency and Timing

For Section 16 Officers, redesignations may only be made into or out of Merck Common Stock during any window period established by the Company from time-to-time. Redesignation out of Merck Common Stock is restricted to amounts held in Merck Common Stock for longer than six months. Redesignation shall not be permitted to the extent the Company is aware of a transaction that the Company reasonably believes may cause a violation under Section 16 of the Exchange Act.

2.    Material, Nonpublic Information

The Committee, in its sole discretion and with advice of counsel, at any time may rescind a redesignation into or out of Merck Common Stock if such redesignation was made by a participant who, (a) at the time of the redesignation was in the possession of material, nonpublic information with respect to the Company; and (b) in the Committee's estimation benefited from such information in the timing of his/her redesignation. The Committee's determination shall be final and binding. In the event of such rescission, the participant's Deferred Compensation Account shall be returned to a status as though such redesignation had not occurred. Notwithstanding the above, the Committee shall not rescind a redesignation if the facts were reviewed by the participant with the General Counsel of the Company or a designee prior to the redesignation and if the General

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Counsel or designee had concluded that such participant was not in possession of adverse material, nonpublic information.

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C.    Conversion of Common Stock Accounts

The Committee may, in its sole discretion, convert all of the shares of Merck Common Stock allocated to a participant's Deferred Compensation Account in the manner provided below where a position which a participant has taken or wishes to take is, in the opinion of the Committee, such as would make uncertain the propriety of the participant's having a continued interest in Merck Common Stock. The date of conversion shall be the date of commencement of such other employment or the date of the Committee's action, whichever is later.

Conversion shall be from an expression of value in shares of Merck Common Stock in the participant's Deferred Compensation Account to an expression of value in United States dollars in another available investment. The value of the Merck Common Stock shall be based upon its closing price on the NYSE on the date of conversion or if no trading took place on such day, the next business day on which trading took place. Any conversion under this Section shall be irrevocable and absolute.

VI. DISTRIBUTION OF DEFERRED COMPENSATION ACCOUNTS

Distribution of Deferred Compensation Accounts shall be made in accordance with the participant's distribution schedule pro rata by investment. Distributions from Merck Common Stock will be made in shares, with cash payable for any partial share, subject to the limitations set forth in Article IV, Section A.5. For Section 16 Officers, distribution of amounts in Merck Common Stock is also restricted to amounts held in Merck Common Stock for longer than six months. Distributions from Mutual Funds will be in cash. Distributions will be valued on the Distribution Date (i.e, the 15^th day of the distribution month or, if such day is not a business day, prior business day) and paid as soon thereafter as practicable. Distribution months shall mean only in January, March, June, September and December. .

A.Separation from Service

1.    Distribution Commences

Upon a participant's Separation from Service, Deferred Compensation Accounts will commence in accordance with the participant's previously elected schedule. If a participant incurs a Separation from Service and thereafter is rehired by the Company Group, such rehire shall be ignored and distributions shall commence notwithstanding such rehire; provided, however, that if the participant is eligible and elects to make additional deferrals, those additional deferrals may be payable in relation to the subsequent Separation from Service.

2.    Specified Employee

Anything in the Program to the contrary notwithstanding, to the extent required by Section 409A, distributions on account of a Separation from Service to a “Specified Employee,” as such term is defined in Section 409A, may not be made before the date which is 6 months after the date of Separation from Service (or, if earlier, the date of death of the employee). Where a payment would have been made to a Specified

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Employee within such 6‑month period and such payment is one of a series of annual payments, the first payment shall be delayed as necessary and the remaining payments shall be made according to their elected schedule notwithstanding such delay, such that two otherwise annual payments may be made in a single year.

B.Death

In the event of a participant's death, whether or not distributions have commenced pursuant to a Participant’s election, Deferred Compensation Accounts under this Program will be distributed to the participant’s beneficiary or estate in a lump sum as soon as administratively feasible and in any event by March 15 of the year following death (except as otherwise permitted by Treas. Reg. Sec. 1.409A-3(g)(4) or any successor thereto).

C.    Automatic Distribution

Except as provided in Schedule II, if a participant incurs a Separation from Service and has a Deferred Compensation Account valued at less than $125,000 on the first Distribution Date thereafter, the Deferred Compensation Account shall be distributed in a lump sum as soon as administratively feasible following such termination and in any event by March 15 of the year following such termination (except as otherwise permitted by Treas. Reg. Sec. 1.409A-3(g)(4) or any successor thereto).

D.    Joint Venture Service

A participant’s termination of employment in order to take a position with a joint venture or other business entity in which the Company shall directly or indirectly own 50 percent or more of the outstanding voting or other ownership interest shall not be considered a Separation from Service.

E.    Hardship Distributions

The Committee shall distribute a participant's Deferred Compensation Account, if and to the extent a participant applies to receive a distribution due to an Unforeseeable Emergency as defined in Treas. Reg. Sec. 1.409A-3(i). A participant wishing a hardship distribution must provide the Committee or its delegate with sufficient evidence to prove compliance with Treas. Reg. Sec. 1.409A-3(i).

F.    Modifications to Distribution Schedule

After making an initial election, a participant may elect to change his or her distribution schedule from time to time, provided, however, such changes shall not be permitted if it might reasonably be expected to cause a “plan failure” as such term is used in Section 409A of the Code. For example, except as otherwise permitted by Section 409A, no election may permit an acceleration of a distribution, or may become effective earlier than one year from the date it is made, or may permit an additional deferral after the initial election unless it results in a deferral of at least five additional years from the previously schedule distribution date. For purposes of this provision, where a participant has elected to receive a distribution as a series of payments, such series shall be considered a single distribution for purposes of Section 409A. Any such elections

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shall be made with the Record Keeper in the manner and in accordance with the process approved by the Company’s’ head of Human Resources Department from time to time.

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VII. TAX WITHHOLDING

A.    Deferrals.

Effective December 1, 2019, the Company shall withhold Social Security and the related income tax amount on deferrals as of the time such deferrals are credited to the Deferred Compensation Account. Such withholding shall be first satisfied, to the extent possible, from any income in the same pay period that is not deferred and to the extent additional withholding is required, by reducing the amount deferred.

B.    Distributions.

The Company will deduct from each distribution amounts required to be withheld for income, Social Security and other tax purposes. Such withholding will be done on a pro rata basis per investment. The Company may also deduct any amounts the participant owes the Company Group for any reason.

VIII. BENEFICIARY DESIGNATIONS

A participant may designate a beneficiary to receive his/her Deferred Compensation Account upon the participant's death. If the beneficiary predeceases the participant or if the participant does not name a beneficiary, the participant's Deferred Compensation Account will be distributed to the participant's estate. Such designation shall be in the form designated by the Company’s head of Human Resources Department from time to time, and it must be received by the Company’s Human Resources Department prior to such participant’s death to be valid.

IX. AMENDMENTS

The Committee may amend or terminate this Program at any time; provided, however, that the Executive Oversight Committee or Oversight Committee by resolution or consent shall have the right to alter or amend this Program in whole or in part to the extent that such alteration or amendment affects participants and beneficiaries in general and does not make special provision for Section 16 Officers; provided further, however, such amendment or termination may not retroactively reduce a participant’s Deferred Compensation Account.

For two years following a change in control of the Company (as such term is defined in the Change in Control Separation Benefits Plan) the material terms of the Program (including terms relating to eligibility, benefit calculation, benefit accrual, cost to participants, subsidies and rates of employee contributions) may not be modified in a manner that is materially adverse to individuals who participated immediately before the change in control. The Company will pay the legal fees and expenses of any participant that prevails on his or her claim for relief in an action regarding an impermissible amendment to the Program (other than ordinary claims for benefits) or, if applicable, in an action regarding restrictive covenants applicable to the participant.

X. NO ASSIGNMENT, ALIENATION

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Except as provided in Article XII, no benefit payable under this Program shall be subject in any manner to anticipation, alienation, sale, transfer, assignment, pledge, encumbrance, or charge, and any attempt to so anticipate, alienate, sell, transfer, assign, pledge, encumber or charge the same shall be void, except as specifically provided in this Plan. No such benefit shall be in any manner liable for or subject to the debts, contracts, liabilities, encroachments or torts of any participant or beneficiary.

XI. CLAIMS AND APPEALS PROCEDURE

A.     Determination of Claim

An Employee or his/her authorized representative may present a claim for benefits to the Executive Director, Compensation and Benefit Administration or the successor thereto (the “Director”) or such other person as the Committee may determine to handle claims and appeals from the Program. The Director will make all determinations as to the Employee's claim for benefits under the Program. If the Director grants a claim, benefits payable under the Program will be paid to the Employee as soon as feasible thereafter. If the Director denies in whole or part any claim for a benefit under the Program, he/she will furnish the claimant with notice of the decision not later than 90 days after receipt of the claim. If special circumstances require an extension of time for processing the claim, the Director will provide a written notice of the extension during the initial 90-day period, in which case a decision will be rendered not more than 180 days after receipt of the claim. The written notice which the Director will provide to every claimant who is denied a claim for benefits will set forth in a manner calculated to be understood by the claimant:

1.    the specific reason or reasons for the denial;

2.    specific reference to pertinent Program provisions on which the denial is based;

3.    a description of any additional material or information necessary for the claimant to perfect the claim and an explanation of why such material or information is necessary; and

4.    appropriate information as to the steps to be taken if the claimant wishes to submit his/her claim for review.

B.     Appeal of Denied Claim

A claimant or his/her authorized representative may request a review of the denied claim by the Committee. Such request will be made in writing and will be presented to the Committee not more than 60 days after receipt by the claimant of written notification of the denial of the claim. The Committee will render its decision on review not later than 60 days after receipt of the claimant's request for review, unless special circumstances require an extension of time, in which case a decision will be rendered as soon as possible but not later than 120 days after receipt of the request for review. The decision on review will be in writing and will include specific reasons for the decision.

C.    ERISA Section 503

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It is intended that the claims procedure of the Program be administered in accordance with regulations of the Department of Labor issued under ERISA Section 503.

D.    Limitation of Action

No action at law or in equity (an “Action”) shall be maintained by a participant, Beneficiary or other individual, entity or party (including but not limited to a person determined to be other than a participant or Beneficiary) (a “Claimant”) against the Program, the Company Group, their affiliates, agents, fiduciaries, officers, directors, employees, successors, assigns or plans (collectively, the “Program Group”) unless (a) the Claimant has presented every basis or argument in support of the Action (a “Claim”) in strict accordance with both Sections A and B of this Article X which Claim is denied in whole or in part and (b) unless the Action is commenced no later than one year after the date the Company Group provides notice of the adverse decision pursuant to Section B. Where the Company Group puts the Claimant on notice of the Company Group’s or Program’s intention with respect to the basis or argument in support of the Action, the Claimant must commence the process described in Section A of this Article X within one year of such notice. A “Claim” includes but is not limited to a claim for benefits or for a purported or actual fiduciary breach by any member of the Program Group. The Limitation of Action pursuant to this Article may only be tolled by a writing executed by the Director.

XII. DOMESTIC RELATIONS ORDERS

Notwithstanding any other provision of this Program to the contrary, the creation, assignment or recognition of a right to any benefit payable with respect to a participant pursuant to a “domestic relations order” (as hereinafter defined) is not prohibited. In the event a right to a benefit hereunder is established pursuant to a domestic relations order, any benefit otherwise payable to the participant or his/her beneficiary hereunder shall be appropriately reduced to reflect the effect of the qualified domestic relations order. For purposes of the Program, “Alternate Payee” means a person who would be an alternate payee under Section 414(p)(8) of the Code if the Program were subject to Section 401(a) of the Code. A “domestic relations order” means any judgment, decree or order within the meaning of Section 414(p), including the approval of a property settlement agreement, provided that:

1. the order relates to the provision of child support, alimony or marital property rights and is made pursuant to state domestic relations or community property laws;

2. the order creates or recognizes the existence of an Alternate Payee's right to receive all or a portion of the participant's Account Balance;

3. the order specifies the name and last known mailing address of the participant and each Alternate Payee covered by the order;

4. the order precisely and unambiguously specifies the amount or percentage of the participant's Account Balance to be paid to each Alternate Payee or the manner in which the amount or percentage is to be determined;

5. the order clearly specifies that it applies to this Program;

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6. the order does not require this Program to provide any type of benefits or form of benefits not otherwise provided under this Program; and

7. the order provides that the Alternate Payee shall receive his or her interest in the Program in a lump sum as soon as administratively feasible following determination by the Company’s legal department (or its delegate) that the order satisfies the requirements of this Article.

XIII. EFFECTIVE DATE

This amendment and restatement of this Program shall be effective as of December 1, 2019.

IN WITNESS WHEREOF, the Merck Oversight Committee has caused this instrument to be executed by Counsel, Global Benefits & Executive Compensation, as of the 22^nd day of November 2019.

MERCK & CO., INC.

By /s/ Bruce Ellis

Bruce W. Ellis

Counsel

Global Benefits & Executive Compensation

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SCHEDULE I

DEFERRAL PROGRAM INVESTMENT ALTERNATIVES

“Mutual Funds” shall mean all of the same investment alternatives offered under the Merck U.S. Savings Plan as in effect from time to time, excluding participant loans and Merck Common Stock.

The Merck Common Stock fund offered under the Deferral Program shall be measured as if it were invested 100% in Merck Common Stock with dividends reinvested in additional shares of Merck Common Stock.

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SCHEDULE II

SPECIAL PROVISIONS APPLICABLE TO

MEDCO HEALTH EMPLOYEES

(Approved July 23, 2002)

DEFINITIONS

Medco Health – Medco Health Solutions, Inc.

Medco Health Employee – A participant who is (i) employed by Medco Health prior to the Spin-Off or (ii) employed by Merck prior to the Spin-Off and expected to be employed by Medco Health prior to or as of the Spin-Off.

Separated Medco Health Employee – A participant in the Deferral Program who is employed by Medco Health as of the date of the Spin-Off and is considered to have terminated employment with the Company as a result of the Spin-Off.

Spin-Off– The distribution by Merck to its shareholders of the equity securities of Medco Health. The Spin-Off will be a divestiture for purposes of the Deferral Program.

SPECIAL PROVISIONS

Notwithstanding anything to the contrary in Article VI, Section C of the Deferral Program, the Deferred Compensation Account of each Separated Medco Health Employee shall be paid out in accordance with Article VI, Section D, without regard to the $125,000 threshold set forth in Section C.

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EX-10.18

Exhibit 10.18

MERCK & CO., INC.

PLAN FOR DEFERRED PAYMENT OF

DIRECTORS' COMPENSATION

(Effective as Amended and Restated January 1, 2020)

TABLE OF CONTENTS

Page

Article I     Purpose     1

Article II     Election of Deferral, Investment Alternatives and Distribution Schedule     1

Article III     Valuation of Deferred Amounts     3

Article IV     Redesignation Within a Deferral Account     5

Article V     Payment of Deferred Amounts     6

Article VI     Designation of Beneficiary     6

Article VII     Plan Amendment or Termination     7

Article VIII    Section 409A Compliance     7

Article IX    Effective Date     7

MERCK & CO., INC.

PLAN FOR DEFERRED PAYMENT OF

DIRECTORS' COMPENSATION

I.    PURPOSE

The Merck & Co., Inc. Plan for Deferred Payment of Directors’ Compensation (“Plan”) provides an unfunded arrangement for directors of Merck & Co., Inc., formerly known as Schering‑Plough Corporation (“Merck” or the “Company”) prior to the closing date (“Closing Date”) of the Agreement and Plan of Merger dated as of March 8, 2009, as amended, by and among Merck & Co., Inc., Schering-Plough Corporation, SP Merger Subsidiary One, Inc. and SP Merger Subsidiary Two, Inc. (the “Transactions”), other than directors that are current employees of the Company or its subsidiaries, to value, account for and ultimately distribute amounts deferred (i) voluntarily in case of annual retainers and Board and committee meeting fees, if any, and (ii) mandatorily in certain other cases as described herein. Prior to the Closing Date, the predecessor to this Plan provided identical benefits to directors of Merck Sharp & Dohme Corp. (formerly Merck & Co, Inc. prior to the Closing Date) (“MSD”).

II. ELECTION OF DEFERRAL, INVESTMENT ALTERNATIVES AND DISTRIBUTION SCHEDULE

A. Election of Voluntary Deferral Amount

1. Prior to December 31 of each year, each director may irrevocably elect (an “Initial Election”) to defer, until termination of service as a director or later, 50% or 100% of each of the following (together, the “Voluntary Deferral Amount”) with respect to the 12 months beginning April 1 of the next calendar year after such Initial Election:

(a) Board retainer

(b) Lead Director retainer

(c) Committee Chairperson retainer

(d) Audit Committee member retainer, and

(e) Board and committee meeting fees, if any.

2. Prior to commencement of duties as a director or within the first 30 days following commencement of services, a director newly elected or appointed to the Board during a calendar year may make an Initial Election for the portion of the Voluntary Deferral Amount applicable to such director's first year of service (or part thereof).

3. The Voluntary Deferral Amount shall be credited as follows: (1) Board and committee meeting fees, if any, that are deferred are credited as of the last business day of each calendar quarter; (2) if the Board retainer, Lead Director retainer, Committee Chairperson retainer and/or Audit Committee member retainer are deferred, a pro-rata share of the deferred retainer is credited as of the last business day of each calendar quarter. The dates as of which the Voluntary Deferral Amount, or parts thereof, are credited to the director's deferred account are hereinafter referred to as the Voluntary Deferral Dates.

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4. Once an Initial Election is made, including, effective December’s 2008, elections made by directors of MSD prior to the Transactions, it shall continue to apply in successive years on the same terms and conditions until the director makes a new Initial Election.

5. Certain directors (the “Schering Directors”) who were directors of Schering‑Plough Corporation on the Closing Date of the Transactions continued service following the Closing Date. Anything in the Plan to the contrary notwithstanding, the Schering Directors were first eligible to elect Voluntary Deferrals by December 31 of the year that includes the Closing Date. That initial election may not apply earlier than January 1 of the following year and shall continue through April 1 of the second year following the Closing Date.

B. Mandatory Deferral Amount

1. As of the Friday following the Company’s Annual Meeting of Shareholders (the “Mandatory Deferral Date”), each director will be credited with an amount equivalent to the annual cash retainer for the 12 month period beginning on the April 1 preceding the Annual Meeting; provided, however, that effective for the 12-month period beginning April 1, 2020 and thereafter, such credit shall instead equal $200,000 (the “Mandatory Deferral Amount”). The Mandatory Deferral Amount will be measured by the Merck Common Stock account.

2. A director newly elected or appointed to the Board after the Mandatory Deferral Date will be credited with a pro rata portion of the Mandatory Deferral Amount applicable to such director's first year of service (or part thereof). Such pro rata portion shall be credited to the director's account as of the first day of such director's service.

3. For purposes of the Mandatory Deferral Amount, the Schering Directors shall be treated as if newly elected or appointed to the Board as of the Closing Date.

C. Automatic Deferral of Executive Committee Fees

Between June 2005, and April 2007, directors of MSD who served as either Chairperson or member of the Board’s Executive Committee, in lieu of any cash payment for such service, were credited with an amount provided by way of retainer or meeting fees (the “Automatic Deferral Amount”). The Automatic Deferral Amount is measured by the Merck Common Stock account.

D. Election of Investment Alternatives

Each Initial Election shall include an election as to the investment alternatives by which the value of amounts deferred will be measured in accordance with Article III, below. Investment alternatives available under this Plan shall be the same as the investment alternatives available from time to time under the Merck & Co., Inc. Deferral Program (the “Executive Deferral Program”); provided, however, that at all times there shall be a Merck Common Stock fund. All investment alternatives

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other than Merck Common Stock are referred to herein as “Other Investment Alternatives.”

E.     Initial Election of Distribution Schedule

An Initial Election shall include an election of the year during which the Distribution Date (as defined below) shall occur and shall apply to all Voluntary Deferral Amounts, Mandatory Deferral Amounts and Automatic Deferral Amounts credited during the same period. The Distribution Date shall be the 15th day of the month (or, if such day is not a business day, the next business day) of a calendar quarter following the Director’s termination of service as a director or such number of years thereafter as would be permitted for distributions elected under the Executive Deferral Program.

F. Changes to Distribution Schedule

If and to the extent that participants in the Executive Deferral Program are permitted to make re-deferral elections from time to time, participants in this Plan may elect to defer their Distribution Dates subject to the same restrictions applicable under the Executive Deferral Program; provided, however, that no re-deferral election may have the effect of accelerating a distribution prior to a director’s termination of service or death.

G. Unforeseeable Emergency

The Committee shall distribute a participant's deferred amounts if and to the extent a participant applies to receive a distribution due to an Unforeseeable Emergency as defined in Treas. Reg. Sec. 1.409A-3(i) or successor thereto. A participant wishing a hardship distribution must provide the Committee or its delegate with sufficient evidence to prove compliance with Treas. Reg. Sec. 1.409A-3(i). Such a participant’s entire account balance may be distributed to satisfy such Unforeseeable Emergency without regard to whether it is invested wholly or partially in Merck Common Stock.

III.VALUATION OF DEFERRED AMOUNTS

A. Merck Common Stock

1. Initial Crediting. The annual Mandatory Deferral Amount shall be used to determine the number of full and partial shares of Merck Common Stock that such amount would purchase at the closing price of the Common Stock on the New York Stock Exchange (“NYSE”) on the Mandatory Deferral Date.

The Automatic Deferral Amount is used to determine the number of full and partial shares of Merck Common Stock that such amount would have purchased at the closing price of the Common Stock on the NYSE.

3

That portion of the Voluntary Deferral Amount allocated to Merck Common Stock shall be used to determine the number of full and partial shares of Merck Common Stock that such amount would purchase at the closing price of the Common Stock on the NYSE on the applicable Voluntary Deferral Date.

This Plan is unfunded: at no time will any shares of Merck Common Stock be purchased or earmarked for such deferred amounts nor will any rights of a shareholder exist with respect to such amounts.

2. Dividends. Each director's account will be credited with the additional number of full and partial shares of Merck Common Stock that would have been purchasable with the dividends on shares previously credited to the account at the closing price of the Common Stock on the NYSE on the date each dividend was paid.

3. Distributions. Distributions from the Merck Common Stock account will be valued at the closing price of Merck Common Stock on the NYSE as of the Distribution Date.

4. For purposes of valuation of Merck Common Stock, if Merck Common Stock is no longer traded on the NYSE, but is publicly traded on any other exchange, references to NYSE shall mean such other exchange. If Merck Common Stock is not publicly traded and if the Governance Committee of the Board of Directors (formerly known as the Committee on Corporate Governance) determines that a measurement of Merck Common Stock on any Mandatory or Voluntary Deferral Date or Distribution Date would not constitute fair market value, then the Committee shall decide on the date and method to determine fair market value, which shall be in accord with any requirements set forth under Section 409A or any successor thereto.

B. Other Investment Alternatives

1.    Initial Crediting. The amount allocated to each Other Investment Alternative shall be used to determine the full and partial Other Investment Alternative shares that such amount would purchase at the closing net asset value of the Other Investment Alternative shares on the Mandatory or Voluntary Deferral Date, whichever is applicable. The director’s account will be credited with the number of full and partial Other Investment Alternative shares so determined.

At no time will any Other Investment Alternative shares be purchased or earmarked for such deferred amounts nor will any rights of a shareholder exist with respect to such amounts.

2. Dividends. Each director’s account will be credited with the additional number of full and partial Other Investment Alternative shares that would have been purchasable, at the closing net asset value of the Other Investment Alternative shares as of the date each dividend is paid on the Other Investment Alternative shares, with the dividends that would have been paid on the number of shares previously credited to such account (including pro rata dividends on any partial shares).

4

3. Distributions. Other Investment Alternative distributions will be valued based on the closing net asset value of the Other Investment Alternative shares as of the Distribution Date.

C. Adjustments

In the event of a reorganization, recapitalization, stock split, stock dividend, combination of shares, merger, consolidation, rights offering or any other change in the corporate structure or shares of the Company or an Other Investment Alternative, the number and kind of shares or units shall be adjusted accordingly.

IV. REDESIGNATION WITHIN A DEFERRAL ACCOUNT

A.    General

A director may redesignate how his or her account is invested among the Other Investment Alternatives (a “Redesignation”). A Redesignation affects only the Investment Alternatives; it does not affect the timing of distributions from the Plan. Except as provided in Section G. of Article II, amounts deferred using the Merck Common Stock method and any earnings attributable to such deferrals may not be redesignated prior to the first anniversary of the termination of the director’s service. The change will be effective at the closing price as of (i) the day when the redesignation request is received pursuant to administrative guidelines established by the Human Resources Financial Services area provided the request is received prior to the close of the NYSE on such day or (ii) the next following business day if the request is received when the NYSE is closed.

B.    When Redesignation May Occur

1. During Active Service. There is no limit on the number of times a director may Redesignate the portion of his/her deferred account permitted to be Redesignated. Each such request shall be irrevocable and can be Redesignated in whole percentages or as a dollar amount.

2. After Death. Following the death of a director, the legal representative or beneficiary of such director may Redesignate subject to the same rules as for active directors set forth in Article IV, Section B.1.

C.    Valuation of Amounts to be Redesignated

The portion of the director's account to be Redesignated will be valued at its cash equivalent and such cash equivalent will be converted into shares or units of the Other Investment Alternatives. For purposes of such Redesignations, the cash equivalent of the value of the Other Investment Alternative shares shall be the closing net asset value of such Other Investment Alternative as of (i) the day when the Redesignation request is received pursuant to administrative guidelines established by the Human Resources Financial Services area of the Treasury department,

5

provided the request is received prior to the close of the NYSE on such day or (ii) the next following business day if the request is received when the NYSE is closed.

V. PAYMENT OF DEFERRED AMOUNTS

A. Payment

All payments to directors of amounts deferred will be in cash as of the Distribution Date. Distributions shall be pro rata by investment alternative. Distributions shall be paid as soon as administratively feasible after the Distribution Date.

B. Forfeitures

A director's deferred amount attributable to the Mandatory Deferral Amount and earnings thereon shall be forfeited upon his or her removal as a director or upon a determination by the Governance Committee, in its sole discretion that, a director has:

(i) joined the Board of, managed, operated, participated in a material way in, entered employment with, performed consulting (or any other) services for, or otherwise been connected in any material manner with a company, corporation, enterprise, firm, limited partnership, partnership, person, sole proprietorship or any other business entity determined by the Governance Committee in its sole discretion to be competitive with the business of the Company, its subsidiaries or its affiliates (a "Competitor");

(ii) directly or indirectly acquired an equity interest of 5 percent or greater in a Competitor; or

(iii) disclosed any material trade secrets or other material confidential information, including customer lists, relating to the Company or to the business of the Company to others, including a Competitor.

VI.    DESIGNATION OF BENEFICIARY

In the event of the death of a director:

A.    The deferred amount at the date of death shall be paid to the last named beneficiary or beneficiaries designated by the director, or, if no beneficiary has been designated, to the legal representative of the director's estate.

B.    A lump sum distribution of any remaining account balance will be made to the director’s beneficiary or estate’s legal representative as soon as administratively feasible following such death, whether or not the director was in service at the time of death or has commenced to receive payments of his or her account balance. The Distribution Date of such a distribution shall be the 15th day of the month (or, if such day is not a business day,

6

the next business day) of the calendar quarter following the date the Company learns of such death.

VII.    PLAN AMENDMENT OR TERMINATION

The Governance Committee shall have the right to amend or terminate this Plan at any time for any reason.

VIII.    SECTION 409A COMPLIANCE

Anything in the Plan to the contrary notwithstanding, the Plan shall comply with Section 409A of the Internal Revenue Code of 1986, as amended (or any successor thereto) (the “Code”) and shall be interpreted in accordance therewith. Any payment called for under the Plan as of or as soon as administratively feasible on or after a designated date shall be made no later than a date within the same tax year of a director, or by March 15 of the following year, if later (or such other time as permitted in Treas. Reg. Sec. 1.409A‑3(d) or any successor thereto); provided further, that the director is not permitted to change the taxable year of payment, except in accordance with Article II, Section F and Section 409A of the Code. Where the Plan’s obligation to pay is unclear, including a dispute about who is the proper beneficiary of a director who dies, payment shall be made as soon as administratively feasible after the Program’s obligation becomes clear and at a time permitted by Treas. Reg. Sec. 1.409A-3(g)(4) or any successor thereto.

IX.    EFFECTIVE DATE.

This amendment and restatement of this plan shall be effective as of January 1, 2020.

7

EX-21

Exhibit 21

MERCK & CO., INC. SUBSIDIARIES

as of 12/31/2019

The following is a list of subsidiaries of the Company, doing business under the name stated.

Name	Country or State of Incorporation
7728026 Canada Inc.	Canada
Aacifar-Produtos Quimicos e Farmaceuticos, Sociedade Unipessoal, Lda	Portugal
Abmaxis Inc.	Delaware
Afferent Pharmaceuticals, Inc.	Delaware
Agrident GmbH	Germany
Allflex Argentia S.A.	Argentina
Allflex Australia Pty Ltd	Australia
Allflex Dan-mark ApS	Denmark
Allflex Europe SAS	France
Allflex Group Germany GmbH	Germany
Allflex USA, Inc.	Delaware
Allflex UK Group	United Kingdom
Allflex Avrasya Havyan Kimlik Sistemleri San. Ve Ticaret Ltd Sti	Turkey
Allflex (China) Intelligent Technology Co., Ltd.	People’s Republic of China
Allflex India Private Limited	India
Allflex Polska Sp z.o.o.	Poland
Allflex New Zealand Limited	New Zealand
Animal Health Registration World Wide (Proprietary) Limited	South Africa
Antelliq Corporation	Delaware
Antelliq Finance, Inc.	Delaware
Antelliq Holdings, Inc.	Delaware
AVL Holdings Limited	United Kingdom
Beijing Protection Science And Technology Co., Ltd.	People’s Republic of China
Biomark, Inc.	Idaho
BRC Ltd.	Bermuda
Burgwedel Biotech GmbH	Germany
Calporta Therapeutics, Inc.	Delaware
Canji, Inc.	Delaware
cCam Biotherapeutics Ltd.	Israel
Cherokee Pharmaceuticals LLC	Delaware
Comsort, Inc.	Delaware
Continuum Professional Services Limited	United Kingdom
Cooper Veterinary Products (Proprietary) Limited	South Africa
Corporation Allflex, Inc.	Canada
Cosmas B.V.	Netherlands
Cubist (UK) Ltd	United Kingdom
Cubist Pharmaceuticals (UK) Ltd.	United Kingdom
Cubist Pharmaceuticals LLC	Delaware
Dashtag	United Kingdom
Desarrollos Farmaceuticos Y Cosmeticos, S.A.	Spain
Dialstat Trading 91 Pty Ltd T/A Allflex SA	South Africa

1

Dieckmann Arzneimittel GmbH	Germany
Diosynth France	France
Diosynth Holding B.V.	Netherlands
Diosynth Produtos Farmo-quimicos Ltda.	Brazil
Elastec S.R.L	Argentina
Essex Italia s.r.l.	Italy
Essex Pharmaceuticals, Inc.	Philippines
Essexfarm, S.A.	Ecuador
European Insurance Risk Excess Designated Activity Company	Ireland
Farmacox-Companhia Farmaceutica, Sociedade Unipessoal, Lda	Portugal
Farmasix-Produtos Farmaceuticos, Sociedade Unipessoal, Lda	Portugal
Financiere MSD	France
Fontelabor-Produtos Farmaceuticos, Sociedade Unipessoal, Lda.	Portugal
Frosst Laboratories, Inc.	Delaware
Frosst Portuguesa - Produtos Farmaceuticos, Sociedade Unipessoal, Lda.	Portugal
Fulford (India) Limited1	India
GlycoFi, Inc.	Delaware
Hangzhou MSD Pharmaceutical Co., Ltd.1	China
Harrisvaccines, Inc.	Iowa
Hawk and Falcon L.L.C.	Delaware
Healthcare Services and Solutions, LLC	Delaware
Heptafarma - Companhia Farmacêutica, Sociedade Unipessoal, Lda.	Portugal
HMR Weight Management Services Corp.	Delaware
HSS Life-Science Holdings, LLC	Delaware
HSS Life-Science Solutions, LLC	Delaware
Hydrochemie GmbH	Germany
Idenix GmbH	Switzerland
Idenix Pharmaceuticals LLC	Delaware
Idenix SARL	France
ILUM Health Solutions LLC	Delaware
Immune Design Corp.	Delaware
Immune Design Ltd.	United Kingdom
Immune Design B.V.	Netherlands
International Indemnity Ltd.	Bermuda
Intervet (Ireland) Limited	Ireland
Intervet (Israel) Ltd.	Israel
Intervet (M) Sdn. Bhd.	Malaysia
Intervet (Proprietary) Limited	South Africa
Intervet (Thailand) Ltd.	Thailand
Intervet AB	Sweden
Intervet Agencies B.V.	Netherlands
Intervet Animal Health Production B.V.	Netherlands
Intervet Animal Health Taiwan Limited	Republic of China
Intervet Argentina S.A.	Argentina
Intervet Australia Pty Limited	Australia
Intervet Bulgaria EOOD	Bulgaria
Intervet Canada Corp.	Canada
Intervet Central America S. de R.L.	Panama

2

Intervet Deutschland GmbH	Germany
Intervet Ecuador S.A.	Ecuador
Intervet Egypt for Animal Health SAE	Egypt
Intervet GesmbH	Austria
Intervet Hellas A.E.	Greece
Intervet Holding B.V.	Netherlands
Intervet Holdings France SAS	France
Intervet Hungaria Ertékesitő Korlátolt Felelősségu Tarsaság	Hungary
Intervet Inc.	Delaware
Intervet India Pvt Limited	India
Intervet International B.V.	Netherlands
Intervet International GmbH	Germany
Intervet International Sarl	France
Intervet LLC	Russian Federation
Intervet Maroc S.A.	Morocco
Intervet Mexico S.A. de C.V.	Mexico
Intervet Middle East Limited	Cyprus
Intervet Nederland B.V.	Netherlands
Intervet Oy	Finland
Intervet Philippines, Inc.	Philippines
Intervet Productions S.A.	France
Intervet Productions Srl	Italy
Intervet Romania SRL	Romania
Intervet S.A.	Peru
Intervet SAS	France
Intervet Schering-Plough Animal Health Pty Ltd	Australia
Intervet South Africa (Proprietary) Limited	South Africa
Intervet Sp. z.o.o.	Poland
Intervet UK Limited	United Kingdom
Intervet UK Production Limited	United Kingdom
Intervet Venezolana SA	Venezuela
Intervet Veterinaria Chile Ltda	Chile
Intervet Veteriner Ilaclari Pazarlama ve Ticaret Ltd. Sirketi	Turkey
Intervet, s.r.o.	Czech Republic
Interveterinaria SA de CV	Mexico
IOmet Pharma Ltd.	United Kingdom
Laboratoires Merck Sharp & Dohme-Chibret	France
Laboratorios Abello, S.A.	Spain
Laboratorios Biopat, S.A.	Spain
Laboratorios Chibret, S.A.	Spain
Laboratorios Frosst, S.A.	Spain
Laboratorios Quimico-Farmaceuticos Chibret, Sociedade Unipessoal, Lda.	Portugal
Maple Leaf Holdings GmbH	Switzerland
Maya Tibbi Urunler Ticaret Limited Sirketi	Turkey
MCM Vaccine B.V.1	Netherlands
MCM Vaccine Co. 1	Pennsylvania
Med-Nim (Proprietary) Limited	South Africa
Merck and Company, Incorporated	Delaware

3

Merck Canada Inc.	Canada
Merck Capital Ventures, LLC1	Delaware
Merck Frosst Canada & Co.	Canada
Merck Frosst Company	Canada
Merck Global Health Innovation Fund, LLC	Delaware
Merck Global Health Innovation, Private Equity, LLC	Delaware
Merck HDAC Research, LLC	Delaware
Merck Holdings II Corp.	Delaware
Merck Holdings III Corp.	Delaware
Merck Holdings IV Corp.	Delaware
Merck Holdings LLC	Delaware
Merck Lumira Biosciences Fund L.P.1	Canada
Merck Registry Holdings, Inc.	New Jersey
Merck International Holdings Corp.	Delaware
Merck Sharp & Dohme (Argentina) LLC	Delaware
Merck Sharp & Dohme (Asia) Limited	Hong Kong
Merck Sharp & Dohme (Australia) Pty. Limited	Australia
Merck Sharp & Dohme (Chile) Ltda.	Chile
Merck Sharp & Dohme (China) Limited	Hong Kong
Merck Sharp & Dohme (Enterprises) B.V.	Netherlands
Merck Sharp & Dohme (Europe) Inc.	Delaware
Merck Sharp & Dohme (Holdings) Limited	United Kingdom
Merck Sharp & Dohme (Holdings) Pty Ltd	Australia
Merck Sharp & Dohme (I.A.) LLC	Delaware
Merck Sharp & Dohme (International) Limited	Bermuda
Merck Sharp & Dohme (Israel - 1996) Company Ltd.	Israel
Merck Sharp & Dohme (Malaysia) SDN. BHD.	Malaysia
Merck Sharp & Dohme (New Zealand) Limited	New Zealand
Merck Sharp & Dohme (Sweden) A.B.	Sweden
Merck Sharp & Dohme (Switzerland) GmbH	Switzerland
Merck Sharp & Dohme Animal Health, S.L.	Spain
Merck Sharp & Dohme Asia Pacific Services Pte. Ltd.	Singapore
Merck Sharp & Dohme B.V.	Netherlands
Merck Sharp & Dohme BH d.o.o.	Bosnia
Merck Sharp & Dohme Bulgaria EOOD	Bulgaria
Merck Sharp & Dohme Colombia S.A.S.	Colombia
Merck Sharp & Dohme Comercializadora, S. de R.L. de C.V.	Mexico
Merck Sharp & Dohme Corp.	New Jersey
Merck Sharp & Dohme Cyprus Limited	Cyprus
Merck Sharp & Dohme d.o.o.	Croatia
Merck Sharp & Dohme d.o.o. Belgrade	Serbia
Merck Sharp & Dohme de Espana SAU	Spain
Merck Sharp & Dohme Farmaceutica Ltda.	Brazil
Merck Sharp & Dohme Finance Europe Limited	United Kingdom
Merck Sharp & Dohme Gesellschaft m.b.H.	Austria
Merck Sharp & Dohme IDEA GmbH	Switzerland
Merck Sharp & Dohme inovativna zdravila d.o.o.	Slovenia
Merck Sharp & Dohme International Services B.V.	Netherlands

4

Merck Sharp & Dohme Ireland (Human Health) Ltd	Ireland
Merck Sharp & Dohme Limitada	Bolivia
Merck Sharp & Dohme Limited	United Kingdom
Merck Sharp & Dohme Manufacturing Unlimited Company	Ireland
Merck Sharp & Dohme OU	Estonia
Merck Sharp & Dohme Peru SRL	Peru
Merck Sharp & Dohme Pharmaceutical Industrial and Commercial Societe Anonyme	Greece
Merck Sharp & Dohme Research GmbH	Switzerland
Merck Sharp & Dohme Romania SRL	Romania
Merck Sharp & Dohme S.A.	Morocco
Merck Sharp & Dohme s.r.o.	Czech Republic
Merck Sharp & Dohme Salud Animal Columbia S.A.S.	Colombia
Merck Sharp & Dohme Saude Animal Ltda.	Brazil
Merck Sharp & Dohme SIA	Latvia
Merck Sharp & Dohme Singapore Trading Pte. Ltd.	Singapore
Merck Sharp & Dohme Tunisie SARL	Tunisia
Merck Sharp & Dohme, Lda.	Portugal
Merck Sharp & Dohme, S. de R.L. de C.V.	Mexico
Merck Sharp & Dohme, s.r.o.	Slovakia
Merck Sharp Dohme Ilaclari Limited Sirketi	Turkey
Merko B.V.	Netherlands
Merko NV	Belgium
Merko Dalton Continental B.V.	Netherlands
ML Holdings (Canada) Inc.	Canada
MMUSA Acquisition II Corp.1	Delaware
MRL Cambridge ESC, LLC	Delaware
MRL San Francisco, LLC	Delaware
MRL Ventures Fund LLC	Delaware
MSD (I.A.) B.V.	Netherlands
MSD (L-SP) Unterstützungskasse GmbH	Germany
MSD (Nippon Holdings) B.V.	Netherlands
MSD (Norge) AS	Norway
MSD (Proprietary) Limited	South Africa
MSD (Shanghai) Pharmaceuticals Consultancy Co., Ltd.	China
MSD (Thailand) Ltd.	Thailand
MSD Access Sdn. Bhd.	Malaysia
MSD Animal Health (Phils.), Inc	Philippines
MSD Animal Health (Shanghai) Trading Co., Ltd.	China
MSD Animal Health A/S	Denmark
MSD Animal Health BVBA	Belgium
MSD Animal Health Danube Biotech GmbH	Austria
MSD Animal Health FZ-LLC	United Arab Emirates
MSD Animal Health GmbH	Switzerland
MSD Animal Health Innovation AS	Norway
MSD Animal Health Innovation GmbH	Germany
MSD Animal Health Innovation Pte. Ltd.	Singapore
MSD Animal Health Innovation SAS	France
MSD Animal Health K.K.	Japan

5

MSD Animal Health Korea Ltd.	Korea, Republic of
MSD Animal Health Limited	United Kingdom
MSD Animal Health Norge AS	Norway
MSD Animal Health Pension Trustee Limited	United Kingdom
MSD Animal Health S.r.l.	Italy
MSD Animal Health Vietnam Co. Ltd.	Viet Nam
MSD Animal Health, Lda.	Portugal
MSD Argentina Holdings B.V.	Netherlands
MSD Argentina SRL	Argentina
MSD Asia Holdings Pte. Ltd.	Singapore
MSD BD-1 GmbH	Switzerland
MSD Belgium BVBA/SPRL	Belgium
MSD Biopharma B.V.	Netherlands
MSD Brazil Investments B.V.	Netherlands
MSD Central America Services S. de R.L.	Panama
MSD China (Investments) B.V.	Netherlands
MSD China B.V.	Netherlands
MSD China Holding Co., Ltd.	China
MSD Cubist Holdings Unlimited Company	Ireland
MSD Danmark ApS	Denmark
MSD Egypt LLC	Egypt
MSD EIC Unlimited Company	Ireland
MSD Eurofinance	Bermuda
MSD Farmaceutica C.A.	Venezuela
MSD FI BV	Netherlands
MSD Finance 2 LLC	Delaware
MSD Finance B.V.	Netherlands
MSD Finance Company	Bermuda
MSD Finance Holdings Unlimited Company	Ireland
MSD Finland Oy	Finland
MSD France	France
MSD Global Research GmbH	Switzerland
MSD Holdings (Ireland) Unlimited Company	Ireland
MSD Holdings 2 G.K.	Japan
MSD Holdings G.K.	Japan
MSD Human Health Holding B.V.	Netherlands
MSD Human Health Holding II B.V.	Netherlands
MSD IDEA Pharmaceuticals Nigeria Limited	Nigeria
MSD IDEA Tunisie	Tunisia
MSD Idenix Holdings Unlimited Company	Ireland
MSD International Finance B.V.	Netherlands
MSD International Finance LLC	Delaware
MSD International GmbH	Switzerland
MSD International Holdings 2 B.V.	Netherlands
MSD International Holdings GmbH	Switzerland
MSD International Investment Holdings Unlimited Company	Ireland
MSD International Manufacturing GmbH	Switzerland
MSD Investment Holdings (Ireland) Unlimited Company	Ireland

6

MSD Investments (Holdings) GmbH	Switzerland
MSD IT Global Innovation Center s.r.o.	Czech Republic
MSD Italia s.r.l.	Italy
MSD K.K.	Japan
MSD Korea Ltd.	Korea
MSD Laboratories India LLC	Delaware
MSD Latin America Services S. de R.L.	Panama
MSD Latin America Services S. de R.L. de C.V.	Mexico
MSD Limited	United Kingdom
MSD Luxembourg S.a.r.l.	Luxembourg
MSD Merck Sharp & Dohme AG	Switzerland
MSD NL 4 B.V.	Netherlands
MSD Oncology GmbH	Switzerland
MSD Oncology Holdings Limited	United Kingdom
MSD Overseas Manufacturing Co (Ireland) Unlimited Company	Ireland
MSD Panama International Services S. de R.L.	Panama
MSD Participations B.V.	Netherlands
MSD Pharma (Singapore) Pte. Ltd.	Singapore
MSD Pharma GmbH	Germany
MSD Pharma Hungary Korlatolt Felelossegu Tarsasag	Hungary
MSD Pharmaceuticals	Russian Federation
MSD Pharmaceuticals Holdings Unlimited Company	Ireland
MSD Pharmaceuticals Investments 1 Unlimited Company	Ireland
MSD Pharmaceuticals Investments 3 Unlimited Company	Ireland
MSD Pharmaceuticals Ireland Unlimited Company	Ireland
MSD Pharmaceuticals Private Limited	India
MSD Polska Dystrybucja Sp. z.o.o.	Poland
MSD Polska Sp.z.o.o.	Poland
MSD R&D (China) Co., Ltd.	China
MSD R&D Innovation Centre Limited	United Kingdom
MSD RDC Costa Rica Sociedad de Responsabilidad Limitada	Cost Rica
MSD Regional Business Support Center GmbH	Germany
MSD Registry Holdings, Inc.	New Jersey
MSD Shared Business Services EMEA Limited	Ireland
MSD Sharp & Dohme Gesellschaft mit beschränkter Haftung	Germany
MSD Switzerland Investments 1 Unlimited Company	Ireland
MSD Switzerland Investments 4 Unlimited Company	Ireland
MSD Switzerland Investments 5 Unlimited Company	Ireland
MSD Ukraine Limited Liability Company	Ukraine
MSD Unterstutzungskasse GmbH	Germany
MSD Vaccines (Ireland) Limited	Ireland
MSD Vaccines Limited	United Kingdom
MSD Vaccins	France
MSD Vaccins Holdings	France
MSD Venezuela Holding GmbH	Switzerland
MSD Ventures (Ireland) Unlimited Company	Ireland
MSD Verwaltungs GmbH	Germany
MSD Vietnam Company Limited	Vietnam

7

MSD Vietnam Holdings B.V.	Netherlands
MSD Vostok B.V.	Netherlands
MSDRG Holdings Unlimited Company	Switzerland
MSDRG LLC	Delaware
MSD-SUN, LLC1	Delaware
Multilan AG	Switzerland
Nanjing Organon Pharmaceutical Co., Ltd.	China
Nihon MSD G.K.	Japan
Nourifarma - Produtos Quimicos e Farmaceuticos, Sociedade Uniperssoal, Lda	Portugal
OBS Holdings B.V.	Netherlands
Oncoethix GmbH	Switzerland
Optimer Pharmaceuticals LLC	Delaware
Organon (India) Private Limited	India
Organon (Ireland) Ltd	Ireland
Organon (Philippines) Inc.	Philippines
Organon Agencies B.V.	Netherlands
Organon BioSciences International B.V.	Netherlands
Organon BioSciences Ventures B.V.	Netherlands
Organon China B.V.	Netherlands
Organon Egypt Ltd	Egypt
Organon Laboratories Limited	United Kingdom
Organon Latin America S.A.	Uruguay
Organon Middle East S.A.L.	Lebanon
Organon Participations B.V.	Netherlands
Organon Teknika Corporation LLC	Delaware
Organon USA Inc.	New Jersey
OS ID AS	Norway
Peloton Therapeutics, Inc.	Delaware
P.T. Merck Sharp & Dohme Indonesia	Indonesia
Physicians Interactive India Private Limited	India
Prondil Sociedad Anónima	Uruguay
PT Intervet Indonesia	Indonesia
PT Merck Sharp Dohme Pharma Tbk 1	Indonesia
Rigontec GmbH	Germany
Rosetta Biosoftware UK Limited	United Kingdom
Rosetta Inpharmatics LLC	Delaware
Scan Aqua AS	Norway
SC Allflex Management, Inc.	Israel
S.C. Allflex Romania S.R.L.	Romania
SCR Europe SRL	Italy
SCR Monitoring Mexico	Mexico
Schering-Plough	France
Schering-Plough (India) Private Limited	India
Schering-Plough (Ireland) Unlimited Company	Ireland
Schering-Plough Animal Health Limited	New Zealand
Schering-Plough Bermuda Ltd.	Bermuda
Schering-Plough Canada Inc.	Canada
Schering-Plough Central East AG	Switzerland

8

Schering-Plough Clinical Trials, S.E.	United Kingdom
Schering-Plough Corporation	Philippines
Schering-Plough Corporation, U.S.A.	Delaware
Schering-Plough del Ecuador, S.A.	Ecuador
Schering-Plough del Peru S.A.	Peru
Schering-Plough Holdings Limited	United Kingdom
Schering-Plough Indústria Farmacêutica Ltda.	Brazil
Schering-Plough Labo NV	Belgium
Schering-Plough Limited	United Kingdom
Schering-Plough Maroc S.a.R.L.	Morocco
Schering-Plough S.A.	Panama
Schering-Plough S.A.	Paraguay
Schering-Plough S.A.	Spain
Schering-Plough S.A.	Uruguay
Schering-Plough S.A. de C.V.	Mexico
Schering-Plough Sante Animale	France
SCR Dairy, Inc.	Delaware
Sentipharm AG	Switzerland
Servicios Veterniarios Servet, Sociedad Anónima	Costa Rica
Shanghai MSD Pharmaceutical Trading Co., Ltd.	China
Sinova AG1	Switzerland
SmartCells, Inc.	Delaware
SOL Limited	Bermuda
S-P Ril Ltd.	United Kingdom
S-P Veterinary Holdings Limited	United Kingdom
S-P Veterinary Limited	United Kingdom
Stallmastaren AB	Sweden
StayWell Health Management, LLC1	Delaware
StayWell Interactive, LLC1	Delaware
Sureflap, LLC	Delaware
Tag ID Investments, Inc.	Delaware
The StayWell Company, LLC1	Delaware
Theriak B.V.	Netherlands
Tilos Therapeutics, Inc.	Delaware
Trius Therapeutics LLC	Delaware
UAB Merck Sharp & Dohme	Lithuania
Undra, S.A. de C.V.	Mexico
Vallée S.A.1	Brazil
Venco Farmaceutica S.A.	Venezuela
Venco Holding GmbH	Switzerland
Vet Pharma Friesoythe GmbH	Germany
Veterinaria Premium, Sociedad Anonima	Guatemala
VetInvent, LLC	Delaware
Vetrex B.V.	Netherlands
Vetrex Egypt L.L.C.	Egypt
Vilsan Veteriner Ilaclari Ticaret ve Sanayi Anonim Sirketi	Turkey
Viralytics Limited	Australia
Vocaltag Ltd.	Israel

9

Vree Health Italia S.r.l.	Italy
Vree Health Ltd.	United Kingdom
Werthenstein Biopharma GmbH	Switzerland
Zoöpharm B.V.	Netherlands

___________

¹ own less than 100%

10

EX-23

Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-224016 and 333-224017) and on Form S-8 (Nos. 333-173025, 333-173024, 333-162883, 333-162884, 333-162885, 333-162886, 333-121089, and 333-233226) of Merck & Co., Inc. of our report dated February 26, 2020 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Florham Park, New Jersey

February 26, 2020

EX-24.1

Exhibit 24.1

POWER OF ATTORNEY

Each of the undersigned does hereby appoint JENNIFER ZACHARY as his/her true and lawful attorney to execute on behalf of the undersigned (whether on behalf of the Company, or as an officer or director thereof, or by attesting the seal of the Company, or otherwise) the Annual Report on Form 10-K of Merck & Co., Inc. for the fiscal year ended December 31, 2019 under the Securities Exchange Act of 1934, including amendments thereto and all exhibits and other documents in connection therewith.

IN WITNESS WHEREOF, this instrument has been duly executed as of the 26^th day of February 2020.

MERCK & CO., Inc.

/s/ Kenneth C. Frazier	Chairman, President and Chief Executive Officer
Kenneth C. Frazier	(Principal Executive Officer; Director)
/s/ Robert M. Davis	Executive Vice President, Global Services,   and Chief Financial Officer
Robert M. Davis	(Principal Financial Officer)
/s/ Rita A. Karachun	Senior Vice President Finance—Global Controller
Rita A. Karachun	(Principal Accounting Officer)

DIRECTORS

/s/ Leslie A. Brun	/s/ Paul B. Rothman
Leslie A. Brun	Paul B. Rothman
/s/ Thomas R. Cech	/s/ Patricia F. Russo
Thomas R. Cech	Patricia F. Russo
/s/ Mary Ellen Coe	/s/ Inge G. Thulin
Mary Ellen Coe	Inge G. Thulin
/s/ Pamela J. Craig	/s/ Wendell P. Weeks
Pamela J Craig	Wendell P. Weeks
/s/ Thomas H. Glocer	/s/ Peter C. Wendell
Thomas H. Glocer	Peter C. Wendell
/s/ Rochelle B. Lazarus
Rochelle B. Lazarus

EX-24.2

Exhibit 24.2

I, Faye C. Brown, Senior Assistant Secretary of Merck & Co., Inc. (the “Company”), a corporation duly organized and existing under the laws of the State of New Jersey, do hereby certify that the following is a true copy of a resolution adopted by unanimous written consent of the Board of Directors of said Company on February 26, 2020 in accordance with the provisions of the By-Laws of said Company:

“Special Resolution No. 16 – 2020

RESOLVED, that the proposed form of the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2019, attached hereto, is hereby approved with such changes as the proper officers of the Company, with the advice of counsel, deem appropriate;

FURTHER RESOLVED, that each officer and director who may be required to execute the aforesaid Annual Report on Form 10-K or any amendments thereto (whether on behalf of the Company or as an officer or director thereof, or by attesting the seal of the Company, or otherwise) is hereby authorized to execute a power of attorney appointing Jennifer Zachary as his/her true and lawful attorney to execute in his/her name, place and stead (in any such capacity) such Annual Report on Form 10‑K and any and all amendments thereto and any and all exhibits and other documents necessary or incidental in connection therewith and to file the same with the Securities and Exchange Commission, the attorney to have power to act and to have full power and authority to do and perform in the name and on behalf of each of said officers and directors, or both, as the case may be, every act whatsoever necessary or advisable to be done in the premises as fully and to all intents and purposes as any such officer or director might or could do in person; and

FURTHER RESOLVED that an executed copy of the Action by Unanimous Written Consent be filed with the minutes of the meetings of the Board of Directors of the Company."

IN WITNESS WHEREOF, I have hereunto subscribed my signature and affixed the seal of the Company this 26^th day of February 2020.

[Corporate Seal]	/s/ Faye C. Brown
	Faye C. Brown Senior Assistant Secretary

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Kenneth C. Frazier, certify that:

1.    I have reviewed this annual report on Form 10-K 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: February 26, 2020

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 annual report on Form 10-K 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:   February 26, 2020

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

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 Annual Report on Form 10-K for the year ended December 31, 2019 (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: February 26, 2020	/s/ Kenneth C. Frazier
	Name: KENNETH C. FRAZIER
	Title: 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 Annual Report on Form 10-K for the fiscal year ended December 31, 2019 (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: February 26, 2020	/s/ Robert M. Davis
	Name: ROBERT M. DAVIS
	Title: Executive Vice President, Global Services, and Chief Financial Officer

XML

Loans Payable, Long-Term Debt and Leases - Balance Sheet Information (Details) $ in Millions	Dec. 31, 2019 USD ($)
Loans Payable, Long-Term Debt and Leases - Balance Sheet Information [Abstract]
Other assets	$ 1,073
Accrued and other current liabilities	236
Other noncurrent liabilities	768
Total operating lease liability	$ 1,004
Weighted-average remaining lease term (years)	7 years 4 months 24 days
Weighted-average discount rate	3.20%

XML

Share-Based Compensation Plans - Assumptions Used to Determine Weighted-Average Fair Value of Options Granted (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement [Abstract]
Expected dividend yield	3.20%	3.40%	3.60%
Risk-free interest rate	2.40%	2.90%	2.00%
Expected volatility	18.70%	19.10%	17.80%
Expected life (years)	5 years 10 months 24 days	6 years 1 month 6 days	6 years 1 month 6 days

XML

Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		$ 22,800	$ 19,000
Employer contributions to defined contribution savings plans		$ 149	$ 136	$ 131
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Percentage of Company's pension investments categorized as Level 3 assets (as percent)		4.00%	5.00%
Pension Benefits | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 860	$ 826
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1,102	968	$ 1,114
Expected contributions to the pension plans and other postretirement benefit plans during next fiscal year		15
Other Postretirement Benefits | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 0	$ 0
United States
Defined Benefit Plan Disclosure [Line Items]
Expected annual standard deviation in returns of the target portfolio which reflects both the equity allocation and the diversification benefits among the asset classes in which the portfolio invests (as percent)		10.00%
Expected rate of return on plan assets (as percent)		8.10%	8.20%	8.70%
United States | Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on plan assets (as percent)		7.70%
United States | Minimum | Forecast
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on plan assets (as percent)	7.00%
United States | Maximum
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on plan assets (as percent)		8.10%
United States | Maximum | Forecast
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on plan assets (as percent)	7.30%
United States | U.S. equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation (as percent)		30.00%
United States | U.S. equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation (as percent)		45.00%
United States | International equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation (as percent)		15.00%
United States | International equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation (as percent)		30.00%
United States | Fixed Income Investments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation (as percent)		35.00%
United States | Fixed Income Investments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation (as percent)		45.00%
United States | Cash And Other Investments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation (as percent)		5.00%
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		$ 12,800	$ 10,400
Fair value of plan assets		11,361	9,648	$ 10,896
Expected contributions to the pension plans and other postretirement benefit plans during next fiscal year		100
United States | Pension Benefits | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		9	13	15
International | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		10,163	$ 8,580	$ 9,339
Expected contributions to the pension plans and other postretirement benefit plans during next fiscal year		$ 150
Expected rate of return on plan assets (as percent)		4.90%	5.10%	5.10%
International | Pension Benefits | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 851	$ 813	$ 473

XML

Contingencies and Environmental Liabilities - Commercial and Other Litigation- Narrative (Details) - Commercial Litigation $ in Millions			12 Months Ended
	Oct. 01, 2018 USD ($) legalmatter	Apr. 29, 2016 legalmatter	Dec. 31, 2019 legalmatter
Loss Contingencies [Line Items]
Additional claims filed		1
Loss Contingency, Claims Settled, Number	700
Loss contingency, pending claims number			2
Settlement awarded to other party | $	$ 8.5
Number of plaintiffs			2

XML

Financial Instruments - Effect of Net Investment Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Pretax (Gain) Loss Recognized in Other Comprehensive Income	$ (10)	$ (18)	$ 0
Foreign exchange contracts | Other (income) expense, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Pretax (Gain) Loss Recognized in Other (income) expense, net for Amounts Excluded from Effectiveness Testing	(31)	(11)	0
Euro-denominated notes
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Pretax (Gain) Loss Recognized in Other Comprehensive Income	(75)	(183)	520
Euro-denominated notes | Other (income) expense, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Pretax (Gain) Loss Recognized in Other (income) expense, net for Amounts Excluded from Effectiveness Testing	$ 0	$ 0	$ 0

XML

Restructuring - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 927	$ 658	$ 927
Expected costs	$ 2,500
Percentage estimate of cumulative pretax costs that will result in cash outlays (primarily from employee separation expense) (as percent)	60.00%
Percentage estimate of cumulative pretax costs that will be non-cash (primarily from accelerated depreciation of facilities) (as percent)	40.00%
Forecast
Restructuring Cost and Reserve [Line Items]
Expected costs				$ 800

XML

Financial Instruments - Information on Derivative Positions Subject to Master Netting Arrangements as if they were Presented on a Net Basis (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross amounts recognized in the consolidated balance sheet, Asset	$ 288,000,000	$ 454,000,000
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, Asset	(84,000,000)	(121,000,000)
Cash collateral received, Asset	(34,000,000)	(107,000,000)
Net amounts, Asset	170,000,000	226,000,000
Gross amounts recognized in the consolidated balance sheet, Liability	97,000,000	160,000,000
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, Liability	(84,000,000)	(121,000,000)
Cash collateral received, liability	0	0
Net amounts, Liability	$ 13,000,000	$ 39,000,000

XML

Earnings Per Share - Narrative (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	2	6	5

XML

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 86	$ 119
Inventories classified in other assets	$ 1,480	$ 1,417
Common stock, par value (in dollars per share)	$ 0.50	$ 0.50
Common stock, shares authorized (in 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 (in shares)	1,038,087,496	984,543,979

XML

Taxes on Income - Income Before Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Domestic	$ 439	$ 3,717	$ 3,483
Foreign	11,025	4,984	3,038
Income Before Taxes	$ 11,464	$ 8,701	$ 6,521

XML

Pension and Other Postretirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2019

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

The net periodic benefit cost (credit) for pension and other postretirement benefit plans consisted of the following components:

	Pension Benefits
	U.S.									International									Other Postretirement Benefits
Years Ended December 31	2019			2018			2017			2019			2018			2017			2019			2018			2017
Service cost	$	293		$	326		$	312		$	238		$	238		$	252		$	48		$	57		$	57
Interest cost	458			432			454			177			178			172			69			69			81
Expected return on plan assets	(817		)	(851		)	(862		)	(426		)	(431		)	(393		)	(72		)	(83		)	(78		)
Amortization of unrecognized prior service cost	(49		)	(50		)	(53		)	(12		)	(13		)	(11		)	(78		)	(84		)	(98		)
Net loss amortization	151			232			180			64			84			98			(10		)	1			1
Termination benefits	31			19			44			8			2			4			5			3			8
Curtailments	14			10			3			6			1			(4		)	(11		)	(8		)	(31		)
Settlements	—			5			—			1			13			5			—			—			—
Net periodic benefit cost (credit)	$	81		$	123		$	78		$	56		$	72		$	123		$	(49	)	$	(45	)	$	(60	)

Obligation and Funded Status

Summarized information about the changes in plan assets and benefit obligations, the funded status and the amounts recorded at December 31 is as follows:

	Pension Benefits												Other Postretirement Benefits
	U.S.						International
	2019			2018			2019			2018			2019			2018
Fair value of plan assets January 1	$	9,648		$	10,896		$	8,580		$	9,339		$	968		$	1,114
Actual return on plan assets	2,165			(810		)	1,505			(289		)	203			(72		)
Company contributions	130			378			262			167			14			6
Effects of exchange rate changes	—			—			31			(352		)	—			—
Benefits paid	(582		)	(772		)	(230		)	(202		)	(104		)	(80		)
Settlements	—			(44		)	(12		)	(106		)	—			—
Other	—			—			27			23			21			—
Fair value of plan assets December 31	$	11,361		$	9,648		$	10,163		$	8,580		$	1,102		$	968
Benefit obligation January 1	$	10,620		$	11,904		$	9,083		$	9,483		$	1,615		$	1,922
Service cost	293			326			238			238			48			57
Interest cost	458			432			177			178			69			69
Actuarial losses (gains) (1)	2,165			(1,258		)	1,313			(154		)	21			(341		)
Benefits paid	(582		)	(772		)	(230		)	(202		)	(104		)	(80		)
Effects of exchange rate changes	—			—			4			(387		)	1			(6		)
Plan amendments	—			—			1			10			—			(9		)
Curtailments	18			13			3			(2		)	—			—
Termination benefits	31			19			8			2			5			3
Settlements	—			(44		)	(12		)	(106		)	—			—
Other	—			—			27			23			18			—
Benefit obligation December 31	$	13,003		$	10,620		$	10,612		$	9,083		$	1,673		$	1,615
Funded status December 31	$	(1,642	)	$	(972	)	$	(449	)	$	(503	)	$	(571	)	$	(647	)
Recognized as:
Other Assets	$	—		$	—		$	837		$	659		$	—		$	—
Accrued and other current liabilities	(92		)	(47		)	(18		)	(14		)	(10		)	(10		)
Other Noncurrent Liabilities	(1,550		)	(925		)	(1,268		)	(1,148		)	(561		)	(637		)

⁽¹⁾ Actuarial losses (gains) primarily reflect changes in discount rates.

Schedule of Accumulated and Projected Benefit Obligations in Excess of Fair Value of Plan Assets

Information related to the funded status of selected pension plans at December 31 is as follows:

	U.S.				International
	2019		2018		2019		2018
Pension plans with a projected benefit obligation in excess of plan assets
Projected benefit obligation	$	13,003	$	10,620	$	7,421	$	6,251
Fair value of plan assets	11,361		9,648		6,135		5,089
Pension plans with an accumulated benefit obligation in excess of plan assets
Accumulated benefit obligation	$	12,009	$	9,702	$	2,476	$	5,936
Fair value of plan assets	10,484		8,966		1,501		5,071

Schedule of Allocation of Plan Assets

The fair values of the Company’s other postretirement benefit plan assets at December 31 by asset category are as follows:

	Fair Value Measurements Using										Fair Value Measurements Using
	Level 1		Level 2		Level 3		NAV (1)		Total		Level 1		Level 2		Level 3		NAV (1)		Total
	2019										2018
Assets
Cash and cash equivalents	$	52	$	—	$	—	$	22	$	74	$	78	$	—	$	—	$	16	$	94
Investment funds
Developed markets equities	19		—		—		324		343		16		—		—		279		295
Emerging markets equities	15		—		—		66		81		12		—		—		67		79
Government and agency obligations	1		—		—		16		17		1		—		—		15		16
Corporate obligations	—		—		—		—		—		—		—		—		3		3
Equity securities																			—
Developed markets	225		—		—		—		225		200		—		—		—		200
Fixed income securities
Government and agency obligations	—		196		—		—		196		—		141		—		—		141
Corporate obligations	—		149		—		—		149		—		116		—		—		116
Mortgage and asset-backed securities	—		17		—		—		17		—		24		—		—		24
Plan assets at fair value	$	312	$	362	$	—	$	428	$	1,102	$	307	$	281	$	—	$	380	$	968

⁽¹⁾ 

Certain investments that were measured at net asset value (NAV) per share or its equivalent have not been classified in the fair value hierarchy. The NAV amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets at December 31, 2019 and 2018.

The fair values of the Company’s pension plan assets at December 31 by asset category are as follows:

	Fair Value Measurements Using										Fair Value Measurements Using
	Level 1		Level 2		Level 3		NAV (1)		Total		Level 1		Level 2		Level 3		NAV (1)		Total
	2019										2018
U.S. Pension Plans
Assets
Cash and cash equivalents	$	3	$	—	$	—	$	236	$	239	$	40	$	—	$	—	$	182	$	222
Investment funds
Developed markets equities	205		—		—		3,542		3,747		169		—		—		3,021		3,190
Emerging markets equities	165		—		—		723		888		121		—		—		720		841
Government and agency obligations	—		—		—		173		173		—		—		—		161		161
Corporate obligations	—		—		—		—		—		—		—		—		32		32
Equity securities
Developed markets	2,451		—		—		—		2,451		2,172		—		—		—		2,172
Fixed income securities																			—
Government and agency obligations	—		2,094		—		—		2,094		—		1,509		—		—		1,509
Corporate obligations	—		1,582		—		—		1,582		—		1,246		—		—		1,246
Mortgage and asset-backed securities	—		178		—		—		178		—		262		—		—		262
Other investments	—		—		9		—		9		—		—		13		—		13
Plan assets at fair value	$	2,824	$	3,854	$	9	$	4,674	$	11,361	$	2,502	$	3,017	$	13	$	4,116	$	9,648
International Pension Plans
Assets
Cash and cash equivalents	$	70	$	1	$	—	$	15	$	86	$	50	$	3	$	—	$	16	$	69
Investment funds
Developed markets equities	546		3,761		—		96		4,403		461		3,071		—		75		3,607
Government and agency obligations	462		2,534		—		207		3,203		372		2,082		—		180		2,634
Emerging markets equities	66		96		—		90		252		56		112		—		83		251
Corporate obligations	5		11		—		109		125		4		7		—		94		105
Fixed income obligations	9		6		—		—		15		7		4		—		—		11
Real estate	—		1		—		—		1		—		1		1		—		2
Equity securities
Developed markets	565		—		—		—		565		544		—		—		—		544
Fixed income securities
Government and agency obligations	3		376		—		—		379		2		291		—		—		293
Corporate obligations	1		135		—		—		136		1		113		—		—		114
Mortgage and asset-backed securities	—		61		—		—		61		—		55		—		—		55
Other investments
Insurance contracts (2)	—		65		851		—		916		—		66		811		—		877
Other	—		5		—		16		21		—		4		1		13		18
Plan assets at fair value	$	1,727	$	7,052	$	851	$	533	$	10,163	$	1,497	$	5,809	$	813	$	461	$	8,580

⁽¹⁾  Certain investments that were measured at net asset value (NAV) per share or its equivalent have not been classified in the fair value hierarchy. The NAV amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets at December 31, 2019 and 2018.

⁽²⁾ 

The plans’ Level 3 investments in insurance contracts are generally valued using a crediting rate that approximates market returns and invest in underlying securities whose market values are unobservable and determined using pricing models, discounted cash flow methodologies, or similar techniques.

Summary of Changes in Fair Value of Company's Level 3 Pension Plan Assets

The table below provides a summary of the changes in fair value, including transfers in and/or out, of all financial assets measured at fair value using significant unobservable inputs (Level 3) for the Company’s pension plan assets:

	2019												2018
	Insurance Contracts			Real Estate			Other			Total			Insurance Contracts			Real Estate			Other			Total
U.S. Pension Plans
Balance January 1	$	—		$	—		$	13		$	13		$	—		$	—		$	15		$	15
Actual return on plan assets:
Relating to assets still held at December 31	—			—			(8		)	(8		)	—			—			(3		)	(3		)
Relating to assets sold during the year	—			—			8			8			—			—			4			4
Purchases and sales, net	—			—			(4		)	(4		)	—			—			(3		)	(3		)
Balance December 31	$	—		$	—		$	9		$	9		$	—		$	—		$	13		$	13
International Pension Plans
Balance January 1	$	811		$	1		$	1		$	813		$	470		$	2		$	1		$	473
Actual return on plan assets:
Relating to assets still held at December 31	54			—			—			54			(32		)	—			—			(32		)
Purchases and sales, net	(14		)	(1		)	(1		)	(16		)	380			(1		)	—			379
Transfers out of Level 3	—			—			—			—			(7		)	—			—			(7		)
Balance December 31	$	851		$	—		$	—		$	851		$	811		$	1		$	1		$	813

Summary of Expected Benefit Payments

Expected benefit payments are as follows:

	U.S. Pension Benefits		International Pension Benefits		Other Postretirement Benefits
2020	$	747	$	242	$	88
2021	717		225		92
2022	710		243		94
2023	718		250		98
2024	708		250		100
2025 — 2029	3,943		1,417		540

Components of Other Comprehensive Income

The following amounts were reflected as components of OCI:

	Pension Plans																		Other Postretirement Benefit Plans
	U.S.									International
Years Ended December 31	2019			2018			2017			2019			2018			2017			2019			2018			2017
Net (loss) gain arising during the period	$	(816	)	$	(397	)	$	(19	)	$	(227	)	$	(505	)	$	309		$	112		$	186		$	170
Prior service (cost) credit arising during the period	(4		)	(4		)	(13		)	(1		)	(10		)	22			(11		)	2			(31		)
	$	(820	)	$	(401	)	$	(32	)	$	(228	)	$	(515	)	$	331		$	101		$	188		$	139
Net loss amortization included in benefit cost	$	151		$	232		$	180		$	64		$	84		$	98		$	(10	)	$	1		$	1
Prior service credit amortization included in benefit cost	(49		)	(50		)	(53		)	(12		)	(13		)	(11		)	(78		)	(84		)	(98		)
	$	102		$	182		$	127		$	52		$	71		$	87		$	(88	)	$	(83	)	$	(97	)

Summary of Weighted Average Assumptions Used in Determining Pension Plan and U.S. Pension and Other Postretirement Benefit Plan Information

The Company reassesses its benefit plan assumptions on a regular basis. The weighted average assumptions used in determining U.S. pension and other postretirement benefit plan and international pension plan information are as follows:

	U.S. Pension and Other Postretirement Benefit Plans						International Pension Plans
December 31	2019		2018		2017		2019		2018		2017
Net periodic benefit cost
Discount rate	4.40	%	3.70	%	4.30	%	2.20	%	2.10	%	2.20	%
Expected rate of return on plan assets	8.10	%	8.20	%	8.70	%	4.90	%	5.10	%	5.10	%
Salary growth rate	4.30	%	4.30	%	4.30	%	2.80	%	2.90	%	2.90	%
Interest crediting rate	3.40	%	3.30	%	3.30	%	2.90	%	2.80	%	3.00	%
Benefit obligation
Discount rate	3.40	%	4.40	%	3.70	%	1.50	%	2.20	%	2.10	%
Salary growth rate	4.20	%	4.30	%	4.30	%	2.80	%	2.80	%	2.90	%
Interest crediting rate	4.90	%	3.40	%	3.30	%	2.80	%	2.90	%	2.80	%

Summary of Health Care Cost Trend Rate Assumptions for Other Postretirement Benefit Plans

The health care cost trend rate assumptions for other postretirement benefit plans are as follows:

December 31	2019		2018
Health care cost trend rate assumed for next year	6.8	%	7.0	%
Rate to which the cost trend rate is assumed to decline	4.5	%	4.5	%
Year that the trend rate reaches the ultimate trend rate	2032		2032

XML

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Jan. 31, 2020	Jun. 30, 2019
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Entity File Number	1-6571
Entity Registrant Name	Merck & Co., Inc.
City Area Code	908
Local Phone Number	740-4000
Entity Incorporation, State or Country Code	NJ
Entity Tax Identification Number	22-1918501
Entity Address, Address Line One	2000 Galloping Hill Road
Entity Address, City or Town	Kenilworth
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07033
Title of 12(b) Security	Common Stock ($0.50 par value)
Trading Symbol	MRK
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		2,536,268,760
Entity Public Float			$ 215,106,000,000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Central Index Key	0000310158
Current Fiscal Year End Date	--12-31
Documents Incorporated by Reference	Proxy Statement for the Annual Meeting of Shareholders to be held May 26, 2020, to be filed with the Securities and Exchange Commission within 120 days after the close of the fiscal year covered by this report
1.125% Notes due 2021
Document Information [Line Items]
Title of 12(b) Security	1.125% Notes due 2021
Trading Symbol	MRK/21
Security Exchange Name	NYSE
0.500% Notes due 2024
Document Information [Line Items]
Title of 12(b) Security	0.500% Notes due 2024
Trading Symbol	MRK 24
Security Exchange Name	NYSE
1.875% Notes due 2026
Document Information [Line Items]
Title of 12(b) Security	1.875% Notes due 2026
Trading Symbol	MRK/26
Security Exchange Name	NYSE
2.500% Notes due 2034
Document Information [Line Items]
Title of 12(b) Security	2.500% Notes due 2034
Trading Symbol	MRK/34
Security Exchange Name	NYSE
1.375% Notes due 2036
Document Information [Line Items]
Title of 12(b) Security	1.375% Notes due 2036
Trading Symbol	MRK 36A
Security Exchange Name	NYSE

XML

Consolidated Statement of Cash Flows (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Cash Flows [Abstract]
Restricted Cash	$ 258	$ 2

XML

Segment Reporting - Sales of Company's Products (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Sales	$ 46,840	$ 42,294	$ 40,122
Proceeds from sale of intangible assets	80	95	85
Operating Segments
Segment Reporting Information [Line Items]
Sales	46,319	42,151	39,662
Operating Segments | Pharmaceutical segment
Segment Reporting Information [Line Items]
Sales	41,751	37,689	35,390
Operating Segments | Pharmaceutical segment | Keytruda
Segment Reporting Information [Line Items]
Sales	11,084	7,171	3,809
Operating Segments | Pharmaceutical segment | Alliance revenue - Lynparza (1)
Segment Reporting Information [Line Items]
Sales	444	187	20
Operating Segments | Pharmaceutical segment | Alliance revenue - Lenvima (1)
Segment Reporting Information [Line Items]
Sales	404	149	0
Operating Segments | Pharmaceutical segment | Emend
Segment Reporting Information [Line Items]
Sales	388	522	556
Operating Segments | Pharmaceutical segment | Gardasil/Gardasil 9
Segment Reporting Information [Line Items]
Sales	3,737	3,151	2,308
Operating Segments | Pharmaceutical segment | ProQuad/M-M-R II/Varivax
Segment Reporting Information [Line Items]
Sales	2,275	1,798	1,676
Operating Segments | Pharmaceutical segment | Pneumovax 23
Segment Reporting Information [Line Items]
Sales	926	907	821
Operating Segments | Pharmaceutical segment | RotaTeq
Segment Reporting Information [Line Items]
Sales	791	728	686
Operating Segments | Pharmaceutical segment | Vaqta
Segment Reporting Information [Line Items]
Sales	238	239	218
Operating Segments | Pharmaceutical segment | Bridion
Segment Reporting Information [Line Items]
Sales	1,131	917	704
Operating Segments | Pharmaceutical segment | Noxafil
Segment Reporting Information [Line Items]
Sales	662	742	636
Operating Segments | Pharmaceutical segment | Primaxin
Segment Reporting Information [Line Items]
Sales	273	265	280
Operating Segments | Pharmaceutical segment | Invanz
Segment Reporting Information [Line Items]
Sales	263	496	602
Operating Segments | Pharmaceutical segment | Cubicin
Segment Reporting Information [Line Items]
Sales	257	367	382
Operating Segments | Pharmaceutical segment | Cancidas
Segment Reporting Information [Line Items]
Sales	249	326	422
Operating Segments | Pharmaceutical segment | Simponi
Segment Reporting Information [Line Items]
Sales	830	893	819
Operating Segments | Pharmaceutical segment | Remicade
Segment Reporting Information [Line Items]
Sales	411	582	837
Operating Segments | Pharmaceutical segment | Belsomra
Segment Reporting Information [Line Items]
Sales	306	260	210
Operating Segments | Pharmaceutical segment | Isentress/Isentress HD
Segment Reporting Information [Line Items]
Sales	975	1,140	1,204
Operating Segments | Pharmaceutical segment | Zepatier
Segment Reporting Information [Line Items]
Sales	370	455	1,660
Operating Segments | Pharmaceutical segment | Zetia
Segment Reporting Information [Line Items]
Sales	590	857	1,344
Operating Segments | Pharmaceutical segment | Vytorin
Segment Reporting Information [Line Items]
Sales	285	497	751
Operating Segments | Pharmaceutical segment | Atozet
Segment Reporting Information [Line Items]
Sales	391	347	225
Operating Segments | Pharmaceutical segment | Adempas
Segment Reporting Information [Line Items]
Sales	419	329	300
Operating Segments | Pharmaceutical segment | Januvia
Segment Reporting Information [Line Items]
Sales	3,482	3,686	3,737
Operating Segments | Pharmaceutical segment | Janumet
Segment Reporting Information [Line Items]
Sales	2,041	2,228	2,158
Operating Segments | Pharmaceutical segment | NuvaRing
Segment Reporting Information [Line Items]
Sales	879	902	761
Operating Segments | Pharmaceutical segment | Implanon/Nexplanon
Segment Reporting Information [Line Items]
Sales	787	703	686
Operating Segments | Pharmaceutical segment | Singulair
Segment Reporting Information [Line Items]
Sales	698	708	732
Operating Segments | Pharmaceutical segment | Cozaar/Hyzaar
Segment Reporting Information [Line Items]
Sales	442	453	484
Operating Segments | Pharmaceutical segment | Nasonex
Segment Reporting Information [Line Items]
Sales	293	376	387
Operating Segments | Pharmaceutical segment | Arcoxia
Segment Reporting Information [Line Items]
Sales	288	335	363
Operating Segments | Pharmaceutical segment | Follistim AQ
Segment Reporting Information [Line Items]
Sales	241	268	298
Operating Segments | Pharmaceutical segment | Other pharmaceutical
Segment Reporting Information [Line Items]
Sales	4,901	4,705	5,314
Operating Segments | Animal Health
Segment Reporting Information [Line Items]
Sales	4,393	4,212	3,875
Operating Segments | Animal Health | Livestock
Segment Reporting Information [Line Items]
Sales	2,784	2,630	2,484
Operating Segments | Animal Health | Companion Animals
Segment Reporting Information [Line Items]
Sales	1,609	1,582	1,391
Operating Segments | Other segments
Segment Reporting Information [Line Items]
Sales	175	250	397
Other
Segment Reporting Information [Line Items]
Sales	521	143	460
United States
Segment Reporting Information [Line Items]
Sales	20,325	18,212	17,424
United States | Operating Segments
Segment Reporting Information [Line Items]
Sales	20,239	18,094	17,340
United States | Operating Segments | Pharmaceutical segment
Segment Reporting Information [Line Items]
Sales	18,759	16,608	15,854
United States | Operating Segments | Pharmaceutical segment | Keytruda
Segment Reporting Information [Line Items]
Sales	6,305	4,150	2,309
United States | Operating Segments | Pharmaceutical segment | Alliance revenue - Lynparza (1)
Segment Reporting Information [Line Items]
Sales	269	127	0
United States | Operating Segments | Pharmaceutical segment | Alliance revenue - Lenvima (1)
Segment Reporting Information [Line Items]
Sales	239	95	0
United States | Operating Segments | Pharmaceutical segment | Emend
Segment Reporting Information [Line Items]
Sales	183	312	342
United States | Operating Segments | Pharmaceutical segment | Gardasil/Gardasil 9
Segment Reporting Information [Line Items]
Sales	1,831	1,873	1,565
United States | Operating Segments | Pharmaceutical segment | ProQuad/M-M-R II/Varivax
Segment Reporting Information [Line Items]
Sales	1,683	1,430	1,374
United States | Operating Segments | Pharmaceutical segment | Pneumovax 23
Segment Reporting Information [Line Items]
Sales	679	627	581
United States | Operating Segments | Pharmaceutical segment | RotaTeq
Segment Reporting Information [Line Items]
Sales	506	496	481
United States | Operating Segments | Pharmaceutical segment | Vaqta
Segment Reporting Information [Line Items]
Sales	130	127	94
United States | Operating Segments | Pharmaceutical segment | Bridion
Segment Reporting Information [Line Items]
Sales	533	386	239
United States | Operating Segments | Pharmaceutical segment | Noxafil
Segment Reporting Information [Line Items]
Sales	282	353	309
United States | Operating Segments | Pharmaceutical segment | Primaxin
Segment Reporting Information [Line Items]
Sales	2	7	10
United States | Operating Segments | Pharmaceutical segment | Invanz
Segment Reporting Information [Line Items]
Sales	30	253	361
United States | Operating Segments | Pharmaceutical segment | Cubicin
Segment Reporting Information [Line Items]
Sales	92	191	189
United States | Operating Segments | Pharmaceutical segment | Cancidas
Segment Reporting Information [Line Items]
Sales	6	12	20
United States | Operating Segments | Pharmaceutical segment | Simponi
Segment Reporting Information [Line Items]
Sales	0	0	0
United States | Operating Segments | Pharmaceutical segment | Remicade
Segment Reporting Information [Line Items]
Sales	0	0	0
United States | Operating Segments | Pharmaceutical segment | Belsomra
Segment Reporting Information [Line Items]
Sales	92	96	98
United States | Operating Segments | Pharmaceutical segment | Isentress/Isentress HD
Segment Reporting Information [Line Items]
Sales	398	513	565
United States | Operating Segments | Pharmaceutical segment | Zepatier
Segment Reporting Information [Line Items]
Sales	118	8	771
United States | Operating Segments | Pharmaceutical segment | Zetia
Segment Reporting Information [Line Items]
Sales	14	45	352
United States | Operating Segments | Pharmaceutical segment | Vytorin
Segment Reporting Information [Line Items]
Sales	16	10	124
United States | Operating Segments | Pharmaceutical segment | Atozet
Segment Reporting Information [Line Items]
Sales	0	0	0
United States | Operating Segments | Pharmaceutical segment | Adempas
Segment Reporting Information [Line Items]
Sales	0	0	0
United States | Operating Segments | Pharmaceutical segment | Januvia
Segment Reporting Information [Line Items]
Sales	1,724	1,969	2,153
United States | Operating Segments | Pharmaceutical segment | Janumet
Segment Reporting Information [Line Items]
Sales	589	811	863
United States | Operating Segments | Pharmaceutical segment | NuvaRing
Segment Reporting Information [Line Items]
Sales	742	722	564
United States | Operating Segments | Pharmaceutical segment | Implanon/Nexplanon
Segment Reporting Information [Line Items]
Sales	568	495	496
United States | Operating Segments | Pharmaceutical segment | Singulair
Segment Reporting Information [Line Items]
Sales	29	20	40
United States | Operating Segments | Pharmaceutical segment | Cozaar/Hyzaar
Segment Reporting Information [Line Items]
Sales	24	23	18
United States | Operating Segments | Pharmaceutical segment | Nasonex
Segment Reporting Information [Line Items]
Sales	9	23	54
United States | Operating Segments | Pharmaceutical segment | Arcoxia
Segment Reporting Information [Line Items]
Sales	0	0	0
United States | Operating Segments | Pharmaceutical segment | Follistim AQ
Segment Reporting Information [Line Items]
Sales	103	115	123
United States | Operating Segments | Pharmaceutical segment | Other pharmaceutical
Segment Reporting Information [Line Items]
Sales	1,563	1,319	1,759
United States | Operating Segments | Animal Health
Segment Reporting Information [Line Items]
Sales	1,306	1,238	1,090
United States | Operating Segments | Animal Health | Livestock
Segment Reporting Information [Line Items]
Sales	582	528	471
United States | Operating Segments | Animal Health | Companion Animals
Segment Reporting Information [Line Items]
Sales	724	710	619
United States | Operating Segments | Other segments
Segment Reporting Information [Line Items]
Sales	174	248	396
United States | Other
Segment Reporting Information [Line Items]
Sales	86	118	84
Int’l
Segment Reporting Information [Line Items]
Sales	26,515	24,083	22,698
Int’l | Operating Segments
Segment Reporting Information [Line Items]
Sales	26,079	24,057	22,322
Int’l | Operating Segments | Pharmaceutical segment
Segment Reporting Information [Line Items]
Sales	22,992	21,081	19,536
Int’l | Operating Segments | Pharmaceutical segment | Keytruda
Segment Reporting Information [Line Items]
Sales	4,779	3,021	1,500
Int’l | Operating Segments | Pharmaceutical segment | Alliance revenue - Lynparza (1)
Segment Reporting Information [Line Items]
Sales	176	61	20
Int’l | Operating Segments | Pharmaceutical segment | Alliance revenue - Lenvima (1)
Segment Reporting Information [Line Items]
Sales	165	54	0
Int’l | Operating Segments | Pharmaceutical segment | Emend
Segment Reporting Information [Line Items]
Sales	205	210	213
Int’l | Operating Segments | Pharmaceutical segment | Gardasil/Gardasil 9
Segment Reporting Information [Line Items]
Sales	1,905	1,279	743
Int’l | Operating Segments | Pharmaceutical segment | ProQuad/M-M-R II/Varivax
Segment Reporting Information [Line Items]
Sales	592	368	303
Int’l | Operating Segments | Pharmaceutical segment | Pneumovax 23
Segment Reporting Information [Line Items]
Sales	247	281	240
Int’l | Operating Segments | Pharmaceutical segment | RotaTeq
Segment Reporting Information [Line Items]
Sales	284	232	204
Int’l | Operating Segments | Pharmaceutical segment | Vaqta
Segment Reporting Information [Line Items]
Sales	108	112	124
Int’l | Operating Segments | Pharmaceutical segment | Bridion
Segment Reporting Information [Line Items]
Sales	598	531	465
Int’l | Operating Segments | Pharmaceutical segment | Noxafil
Segment Reporting Information [Line Items]
Sales	380	389	327
Int’l | Operating Segments | Pharmaceutical segment | Primaxin
Segment Reporting Information [Line Items]
Sales	271	258	270
Int’l | Operating Segments | Pharmaceutical segment | Invanz
Segment Reporting Information [Line Items]
Sales	233	243	241
Int’l | Operating Segments | Pharmaceutical segment | Cubicin
Segment Reporting Information [Line Items]
Sales	165	176	193
Int’l | Operating Segments | Pharmaceutical segment | Cancidas
Segment Reporting Information [Line Items]
Sales	242	314	402
Int’l | Operating Segments | Pharmaceutical segment | Simponi
Segment Reporting Information [Line Items]
Sales	830	893	819
Int’l | Operating Segments | Pharmaceutical segment | Remicade
Segment Reporting Information [Line Items]
Sales	411	582	837
Int’l | Operating Segments | Pharmaceutical segment | Belsomra
Segment Reporting Information [Line Items]
Sales	214	164	112
Int’l | Operating Segments | Pharmaceutical segment | Isentress/Isentress HD
Segment Reporting Information [Line Items]
Sales	576	627	639
Int’l | Operating Segments | Pharmaceutical segment | Zepatier
Segment Reporting Information [Line Items]
Sales	252	447	888
Int’l | Operating Segments | Pharmaceutical segment | Zetia
Segment Reporting Information [Line Items]
Sales	575	813	992
Int’l | Operating Segments | Pharmaceutical segment | Vytorin
Segment Reporting Information [Line Items]
Sales	269	487	627
Int’l | Operating Segments | Pharmaceutical segment | Atozet
Segment Reporting Information [Line Items]
Sales	391	347	225
Int’l | Operating Segments | Pharmaceutical segment | Adempas
Segment Reporting Information [Line Items]
Sales	419	329	300
Int’l | Operating Segments | Pharmaceutical segment | Januvia
Segment Reporting Information [Line Items]
Sales	1,758	1,718	1,584
Int’l | Operating Segments | Pharmaceutical segment | Janumet
Segment Reporting Information [Line Items]
Sales	1,452	1,417	1,296
Int’l | Operating Segments | Pharmaceutical segment | NuvaRing
Segment Reporting Information [Line Items]
Sales	136	180	197
Int’l | Operating Segments | Pharmaceutical segment | Implanon/Nexplanon
Segment Reporting Information [Line Items]
Sales	219	208	191
Int’l | Operating Segments | Pharmaceutical segment | Singulair
Segment Reporting Information [Line Items]
Sales	669	688	692
Int’l | Operating Segments | Pharmaceutical segment | Cozaar/Hyzaar
Segment Reporting Information [Line Items]
Sales	418	431	466
Int’l | Operating Segments | Pharmaceutical segment | Nasonex
Segment Reporting Information [Line Items]
Sales	284	353	333
Int’l | Operating Segments | Pharmaceutical segment | Arcoxia
Segment Reporting Information [Line Items]
Sales	288	335	363
Int’l | Operating Segments | Pharmaceutical segment | Follistim AQ
Segment Reporting Information [Line Items]
Sales	138	153	174
Int’l | Operating Segments | Pharmaceutical segment | Other pharmaceutical
Segment Reporting Information [Line Items]
Sales	3,343	3,380	3,556
Int’l | Operating Segments | Animal Health
Segment Reporting Information [Line Items]
Sales	3,086	2,974	2,785
Int’l | Operating Segments | Animal Health | Livestock
Segment Reporting Information [Line Items]
Sales	2,201	2,102	2,013
Int’l | Operating Segments | Animal Health | Companion Animals
Segment Reporting Information [Line Items]
Sales	885	872	772
Int’l | Operating Segments | Other segments
Segment Reporting Information [Line Items]
Sales	1	2	1
Int’l | Other
Segment Reporting Information [Line Items]
Sales	$ 436	$ 26	$ 376

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Collaborative Arrangements (Tables)

12 Months Ended

Dec. 31, 2019

Collaborative Arrangements [Abstract]

Schedule of Collaborative Arrangements

Summarized financial information related to this collaboration is as follows:

Years Ended December 31	2019		2018
Alliance revenue	$	404	$	149
Cost of sales (1)	206		39
Selling, general and administrative	80		13
Research and development (2)	189		1,489
December 31	2019		2018
Receivables from Eisai included in Other current assets	$	150	$	71
Payables to Eisai included in Accrued and other current liabilities (3)	700		375
Payables to Eisai included in Other Noncurrent Liabilities (3)	525		543

⁽¹⁾ Represents amortization of capitalized milestone payments.

⁽²⁾ Amount for 2018 includes $1.4 billion related to the upfront payment and option payments.

⁽³⁾ Includes accrued milestone and future option payments.

Summarized financial information related to this collaboration is as follows:

Years Ended December 31	2019		2018		2017
Net product sales recorded by Merck	$	215	$	190	$	149
Merck’s profit share from sales in Bayer’s marketing territories	204		139		151
Total sales	419		329		300
Cost of sales (1)	113		216		99
Selling, general and administrative	41		35		27
Research and development	126		127		101
December 31	2019		2018
Receivables from Bayer included in Other current assets	$	49	$	32
Payables to Bayer included in Other Noncurrent Liabilities (2)	375		375

⁽¹⁾ Includes amortization of intangible assets.

⁽²⁾ Represents accrued milestone payment.

Summarized financial information related to this collaboration is as follows:

Years Ended December 31	2019		2018		2017
Alliance revenue	$	444	$	187	$	20
Cost of sales (1)	148		93		4
Selling, general and administrative	138		48		1
Research and development (2)	168		152		2,419
December 31	2019		2018
Receivables from AstraZeneca included in Other current assets	$	128	$	52
Payables to AstraZeneca included in Accrued and other current liabilities (3)	577		405
Payables to AstraZeneca included Other Noncurrent Liabilities (3)	—		250

⁽¹⁾ Represents amortization of capitalized milestone payments.

⁽²⁾ Amount for 2017 includes $2.35 billion related to the upfront payment and license option payments.

⁽³⁾ Includes accrued milestone payments.

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Goodwill and Other Intangibles (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill Activity by Segment

The following table summarizes goodwill activity by segment:

 

	Pharmaceutical		Animal Health			All Other			Total
Balance January 1, 2018	$	16,066	$	1,877		$	341		$	18,284
Acquisitions	—		17			24			41
Impairments	—		—			(144		)	(144		)
Other (1)	96		(24		)	—			72
Balance December 31, 2018 (2)	16,162		1,870			221			18,253
Acquisitions	19		1,322			—			1,341
Impairments	—		—			(162		)	(162		)
Other (1)	—		—			(7		)	(7		)
Balance December 31, 2019 (2)	$	16,181	$	3,192		$	52		$	19,425

⁽¹⁾ Other includes cumulative translation adjustments on goodwill balances and certain other adjustments.

⁽²⁾ Accumulated goodwill impairment losses at December 31, 2019 and 2018 were $531 million and $369 million, respectively.

Other Intangibles

Other intangibles at December 31 consisted of:

	2019						2018
	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Products and product rights	$	45,947	$	38,852	$	7,095	$	46,615	$	37,585	$	9,030
Licenses	3,185		824		2,361		2,081		408		1,673
IPR&D	1,032		—		1,032		1,064		—		1,064
Trade names	2,899		217		2,682		209		107		102
Other	2,261		1,235		1,026		2,403		1,168		1,235
	$	55,324	$	41,128	$	14,196	$	52,372	$	39,268	$	13,104

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Goodwill and Other Intangibles

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangibles

Goodwill and Other Intangibles

The following table summarizes goodwill activity by segment:

 

	Pharmaceutical		Animal Health			All Other			Total
Balance January 1, 2018	$	16,066	$	1,877		$	341		$	18,284
Acquisitions	—		17			24			41
Impairments	—		—			(144		)	(144		)
Other (1)	96		(24		)	—			72
Balance December 31, 2018 (2)	16,162		1,870			221			18,253
Acquisitions	19		1,322			—			1,341
Impairments	—		—			(162		)	(162		)
Other (1)	—		—			(7		)	(7		)
Balance December 31, 2019 (2)	$	16,181	$	3,192		$	52		$	19,425

⁽¹⁾ Other includes cumulative translation adjustments on goodwill balances and certain other adjustments.

⁽²⁾ Accumulated goodwill impairment losses at December 31, 2019 and 2018 were $531 million and $369 million, respectively.

The additions to goodwill within the Animal Health segment in 2019 primarily relate to the acquisition of Antelliq (see Note 3). The impairments of goodwill within other non-reportable segments in 2019 and 2018 relate to certain businesses within the Healthcare Services segment.

Other intangibles at December 31 consisted of:

	2019						2018
	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Products and product rights	$	45,947	$	38,852	$	7,095	$	46,615	$	37,585	$	9,030
Licenses	3,185		824		2,361		2,081		408		1,673
IPR&D	1,032		—		1,032		1,064		—		1,064
Trade names	2,899		217		2,682		209		107		102
Other	2,261		1,235		1,026		2,403		1,168		1,235
	$	55,324	$	41,128	$	14,196	$	52,372	$	39,268	$	13,104

Acquired intangibles include products and product rights, licenses, trade names and patents, which are initially recorded at fair value, assigned an estimated useful life, and amortized primarily on a straight-line basis over their estimated useful lives. Some of the Company’s more significant acquired intangibles, on a net basis, related to human health marketed products (included in products and product rights above) at December 31, 2019 include Zerbaxa, $2.4 billion; Implanon/Nexplanon, $412 million; Gardasil/Gardasil 9, $314 million; Dificid, $312 million; Bridion, $230 million; Sivextro, $171 million; and Simponi, $163 million. Additionally, the Company had $2.4 billion of acquired intangibles related to animal health marketed products at December 31, 2019. Some of the Company’s more significant intangible assets included in licenses above at December 31, 2019 include Lenvima, $956 million and Lynparza, $955 million as a result of collaborations with Eisai and AstraZeneca (see Note 4). The increase in trade names in 2019 reflects $2.7 billion of intangibles acquired in the Antelliq acquisition in 2019 (see Note 3). The Company has an intangible asset related to Adempas as a result of a collaboration with Bayer (see Note 4) that had a carrying value of $883 million at December 31, 2019 reflected in “Other” in the table above.

In 2019, the Company recorded impairment charges related to marketed products and other intangibles of $705 million within Cost of sales. Of this amount, $612 million related to Sivextro, a product for the treatment of acute bacterial skin and skin structure infections caused by designated susceptible Gram-positive organisms. As part of a reorganization and reprioritization of its internal sales force, the Company made the decision to cease promotion of Sivextro in the U.S. market by the end of 2019. This decision resulted in reduced cash flow projections for Sivextro, which indicated that the Sivextro intangible asset value was not fully recoverable on an undiscounted cash flows basis. The Company utilized market participant assumptions to determine its best estimate of the fair value of the intangible

asset related to Sivextro that, when compared with its related carrying value, resulted in the impairment charge noted above.

In 2017, the Company recorded impairment charges related to marketed products and other intangibles of $58 million. Of this amount, $47 million related to Intron A, a treatment for certain types of cancers. Sales of Intron A were being adversely affected by the availability of new therapeutic options. In 2017, sales of Intron A in the United States eroded more rapidly than previously anticipated by the Company, which led to changes in the cash flow assumptions for Intron A. These revisions to cash flows indicated that the Intron A intangible asset value was not fully recoverable on an undiscounted cash flows basis. The Company utilized market participant assumptions to determine its best estimate of the fair value of the intangible asset related to Intron A that, when compared with its related carrying value, resulted in the impairment charge noted above. The remaining charges in 2017 relate to the impairment of customer relationship, tradename and developed technology intangibles for certain businesses in the Healthcare Services segment.

IPR&D that the Company acquires through business combinations represents the fair value assigned to incomplete research projects which, at the time of acquisition, have not reached technological feasibility. Amounts capitalized as IPR&D are accounted for as indefinite-lived intangible assets, subject to impairment testing until completion or abandonment of the projects. Upon successful completion of each project, the Company will make a separate determination as to the then useful life of the asset and begin amortization.

In 2019, the Company recorded $172 million of IPR&D impairment charges within Research and development expenses. Of this amount, $155 million relates to the write-off of the intangible asset balance for programs obtained in connection with the acquisition of IOmet Pharma Ltd following a review of clinical trial results conducted by Merck, along with external clinical trial results for similar compounds. The discontinuation of this clinical development program resulted in a reversal of the related liability for contingent consideration of $11 million.

In 2018, the Company recorded $152 million of IPR&D impairment charges. Of this amount, $139 million relates to the write-off of the remaining intangible asset balance for a program obtained in connection with the SmartCells acquisition following a decision to terminate the program due to product development issues. The discontinuation of this clinical development program resulted in a reversal of the related liability for contingent consideration of $60 million (see Note 6).

In 2017, the Company recorded $483 million of IPR&D impairment charges. Of this amount, $240 million resulted from a strategic decision to discontinue the development of the investigational combination regimens MK-3682B (grazoprevir/ruzasvir/uprifosbuvir) and MK-3682C (ruzasvir/uprifosbuvir) for the treatment of chronic hepatitis C virus (HCV) infection. This decision was made based on a review of available Phase 2 efficacy data and in consideration of the evolving marketplace and the growing number of treatment options available for patients with chronic HCV infection, including Zepatier, which is marketed by the Company for the treatment of adult patients with chronic HCV infection. As a result of this decision, the Company recorded an IPR&D impairment charge to write-off the remaining intangible asset related to uprifosbuvir. The IPR&D impairment charges in 2017 also include a charge of $226 million to write-off the intangible asset related to verubecestat, an investigational small molecule inhibitor of the beta-site amyloid precursor protein cleaving enzyme 1 (BACE1), resulting from a decision in February 2018 to stop a Phase 3 study evaluating verubecestat in people with prodromal Alzheimer’s disease. The decision to stop the study followed a recommendation by the external Data Monitoring Committee (eDMC), which assessed overall benefit/risk during an interim safety analysis. The eDMC concluded that it was unlikely that positive benefit/risk could be established if the trial continued.

The IPR&D projects that remain in development are subject to the inherent risks and uncertainties in drug development and it is possible that the Company will not be able to successfully develop and complete the IPR&D programs and profitably commercialize the underlying product candidates.

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.

Aggregate amortization expense recorded within Cost of sales was $2.0 billion in 2019, $3.1 billion in 2018 and $3.2 billion in 2017. The estimated aggregate amortization expense for each of the next five years is as follows: 2020, $1.6 billion; 2021, $1.5 billion; 2022, $1.5 billion; 2023, $1.5 billion; 2024, $1.4 billion.

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Collaborative Arrangements

12 Months Ended

Dec. 31, 2019

Collaborative Arrangements [Abstract]

Collaborative Arrangements

Collaborative Arrangements

Merck has entered into collaborative arrangements that provide the Company with varying rights to develop, produce and market products together with its collaborative partners. Both parties in these arrangements are active participants and exposed to significant risks and rewards dependent on the commercial success of the activities of the collaboration. Merck’s more significant collaborative arrangements are discussed below.

AstraZeneca

In July 2017, Merck and AstraZeneca PLC (AstraZeneca) entered into a global strategic oncology collaboration to co-develop and co-commercialize AstraZeneca’s Lynparza for multiple cancer types. Lynparza is an oral poly (ADP-ribose) polymerase (PARP) inhibitor currently approved for certain types of ovarian and breast cancer. The companies are jointly developing and commercializing Lynparza, both as monotherapy and in combination trials with other potential medicines. Independently, Merck and AstraZeneca will develop and commercialize Lynparza in combinations with their respective PD-1 and PD-L1 medicines, Keytruda and Imfinzi. The companies will also jointly develop and commercialize AstraZeneca’s selumetinib, an oral, potent, selective inhibitor of MEK, part of the mitogen-activated protein kinase (MAPK) pathway, currently being developed for multiple indications. Under the terms of the agreement, AstraZeneca and Merck will share the development and commercialization costs for Lynparza and selumetinib monotherapy and non-PD-L1/PD-1 combination therapy opportunities.

Gross profits from Lynparza and selumetinib product sales generated through monotherapies or combination therapies are shared equally. Merck will fund all development and commercialization costs of Keytruda in combination with Lynparza or selumetinib. AstraZeneca will fund all development and commercialization costs of Imfinzi in combination with Lynparza or selumetinib. AstraZeneca is the principal on Lynparza sales transactions. Merck records its share of Lynparza product sales, net of cost of sales and commercialization costs, as alliance revenue and its share of development costs associated with the collaboration as part of Research and development expenses. Reimbursements received from AstraZeneca for research and development expenses are recognized as reductions to Research and development costs.

As part of the agreement, Merck made an upfront payment to AstraZeneca of $1.6 billion in 2017 and made payments of $750 million over a multi-year period for certain license options (of which $250 million was paid in December 2017, $400 million was paid in December 2018 and $100 million was paid in December 2019). The Company recorded an aggregate charge of $2.35 billion in Research and development expenses in 2017 related to the upfront payment and license option payments. In addition, the agreement provides for additional contingent payments from Merck to AstraZeneca related to the successful achievement of sales-based and regulatory milestones.

In 2019, Merck determined it was probable that annual sales of Lynparza in the future would trigger a $300 million sales-based milestone payment from Merck to AstraZeneca. Accordingly, in 2019, Merck recorded a $300

million liability and a corresponding increase to the intangible asset related to Lynparza. Prior to 2019, Merck accrued sales-based milestone payments aggregating $700 million, of which $200 million and $250 million was paid to AstraZeneca in 2019 and 2018, respectively, and the remainder of $250 million was paid in January 2020. Potential future sales-based milestone payments of $3.1 billion have not yet been accrued as they are not deemed by the Company to be probable at this time.

In 2019, Lynparza received regulatory approval in the European Union (EU) both as a monotherapy for the treatment of certain adult patients with advanced breast cancer and as a monotherapy for the maintenance treatment of certain adult patients with BRCA-mutated advanced ovarian cancer. Each of these approvals triggered a $30 million capitalized milestone payment from Merck to AstraZeneca. In 2018, Lynparza received regulatory approvals triggering capitalized milestone payments of $140 million in the aggregate from Merck to AstraZeneca. Potential future regulatory milestone payments of $1.7 billion remain under the agreement.

The intangible asset balance related to Lynparza (which includes capitalized sales-based and regulatory milestone payments) was $955 million at December 31, 2019 and is included in Other Intangibles, Net on the Consolidated Balance Sheet. The amount is being amortized over its estimated useful life through 2028 as supported by projected future cash flows, subject to impairment testing.

Summarized financial information related to this collaboration is as follows:

Years Ended December 31	2019		2018		2017
Alliance revenue	$	444	$	187	$	20
Cost of sales (1)	148		93		4
Selling, general and administrative	138		48		1
Research and development (2)	168		152		2,419
December 31	2019		2018
Receivables from AstraZeneca included in Other current assets	$	128	$	52
Payables to AstraZeneca included in Accrued and other current liabilities (3)	577		405
Payables to AstraZeneca included Other Noncurrent Liabilities (3)	—		250

⁽¹⁾ Represents amortization of capitalized milestone payments.

⁽²⁾ Amount for 2017 includes $2.35 billion related to the upfront payment and license option payments.

⁽³⁾ Includes accrued milestone payments.

Eisai

In March 2018, Merck and Eisai announced a strategic collaboration for the worldwide co-development and co-commercialization of Lenvima, an orally available tyrosine kinase inhibitor discovered by Eisai. Under the agreement, Merck and Eisai will develop and commercialize Lenvima jointly, both as monotherapy and in combination with Merck’s Keytruda. Eisai records Lenvima product sales globally (Eisai is the principal on Lenvima sales transactions), and Merck and Eisai share gross profits equally. Merck records its share of Lenvima product sales, net of cost of sales and commercialization costs, as alliance revenue. Expenses incurred during co-development, including for studies evaluating Lenvima as monotherapy, are shared equally by the two companies and reflected in Research and development expenses.

Under the agreement, Merck made an upfront payment to Eisai of $750 million and will make payments of up to $650 million for certain option rights through 2021 (of which $325 million was paid in March 2019, $200 million is expected to be paid in March 2020 and $125 million is expected to be paid in March 2021). The Company recorded an aggregate charge of $1.4 billion in Research and development expenses in 2018 related to the upfront payment and future option payments. In addition, the agreement provides for additional contingent payments from Merck to Eisai related to the successful achievement of sales-based and regulatory milestones.

In 2019, Merck determined it was probable that annual sales of Lenvima in the future would trigger sales-based milestone payments from Merck to Eisai aggregating $682 million. Accordingly, in 2019, Merck recorded $682 million of liabilities and corresponding increases to the intangible asset related to Lenvima. In 2018, Merck accrued sales-based milestone payments aggregating $268 million related to Lenvima. Of these amounts, $50 million was paid

to Eisai in 2019 and an additional $150 million was paid in January 2020. Potential future sales-based milestone payments of $3.0 billion have not yet been accrued as they are not deemed by the Company to be probable at this time.

In 2018, Lenvima received regulatory approvals triggering capitalized milestone payments of $250 million in the aggregate from Merck to Eisai. Potential future regulatory milestone payments of $135 million remain under the agreement.

The intangible asset balance related to Lenvima (which includes capitalized sales-based and regulatory milestone payments) was $956 million at December 31, 2019 and is included in Other Intangibles, Net on the Consolidated Balance Sheet. The amount is being amortized over its estimated useful life through 2026 as supported by projected future cash flows, subject to impairment testing.

Summarized financial information related to this collaboration is as follows:

Years Ended December 31	2019		2018
Alliance revenue	$	404	$	149
Cost of sales (1)	206		39
Selling, general and administrative	80		13
Research and development (2)	189		1,489
December 31	2019		2018
Receivables from Eisai included in Other current assets	$	150	$	71
Payables to Eisai included in Accrued and other current liabilities (3)	700		375
Payables to Eisai included in Other Noncurrent Liabilities (3)	525		543

⁽¹⁾ Represents amortization of capitalized milestone payments.

⁽²⁾ Amount for 2018 includes $1.4 billion related to the upfront payment and option payments.

⁽³⁾ Includes accrued milestone and future option payments.

Bayer AG

In 2014, the Company entered into a worldwide clinical development collaboration with Bayer AG (Bayer) to market and develop soluble guanylate cyclase (sGC) modulators including Bayer’s Adempas, which is approved to treat pulmonary arterial hypertension and chronic thromboembolic pulmonary hypertension. The two companies have implemented a joint development and commercialization strategy. The collaboration also includes clinical development of Bayer’s vericiguat, which is in Phase 3 trials for worsening heart failure, as well as opt-in rights for other early-stage sGC compounds in development by Bayer. Merck in turn made available its early-stage sGC compounds under similar terms. Under the agreement, Bayer leads commercialization of Adempas in the Americas, while Merck leads commercialization in the rest of the world. For vericiguat and other potential opt-in products, Bayer will lead commercialization in the rest of world and Merck will lead in the Americas. For all products and candidates included in the agreement, both companies will share in development costs and profits on sales and will have the right to co-promote in territories where they are not the lead. Revenue from Adempas 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. In addition, the agreement provides for additional contingent payments from Merck to Bayer related to the successful achievement of sales-based milestones.

In 2018, Merck determined it was probable that annual worldwide sales of Adempas in the future would trigger a $375 million sales-based milestone payment from Merck to Bayer. Accordingly, Merck recorded a $375 million liability and a corresponding increase to the intangible asset related to Adempas. In 2018, the Company made a $350 million milestone payment to Bayer, which was accrued for in 2016 when Merck deemed the payment to be probable. There is an additional $400 million potential future sales-based milestone payment that has not yet been accrued as it is not deemed by the Company to be probable at this time.

The intangible asset balance related to Adempas (which includes the acquired intangible asset balance, as well as capitalized sales-based milestone payments) was $883 million at December 31, 2019 and is included in Other Intangibles, Net on the Consolidated Balance Sheet. The amount is being amortized over its estimated useful life through 2027 as supported by projected future cash flows, subject to impairment testing.

Summarized financial information related to this collaboration is as follows:

Years Ended December 31	2019		2018		2017
Net product sales recorded by Merck	$	215	$	190	$	149
Merck’s profit share from sales in Bayer’s marketing territories	204		139		151
Total sales	419		329		300
Cost of sales (1)	113		216		99
Selling, general and administrative	41		35		27
Research and development	126		127		101
December 31	2019		2018
Receivables from Bayer included in Other current assets	$	49	$	32
Payables to Bayer included in Other Noncurrent Liabilities (2)	375		375

⁽¹⁾ Includes amortization of intangible assets.

⁽²⁾ Represents accrued milestone payment.

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Earnings per Share

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Earnings per Share

Earnings per Share

The calculations of earnings per share (shares in millions) are as follows:

Years Ended December 31	2019		2018		2017
Net income attributable to Merck & Co., Inc.	$	9,843	$	6,220	$	2,394
Average common shares outstanding	2,565		2,664		2,730
Common shares issuable (1)	15		15		18
Average common shares outstanding assuming dilution	2,580		2,679		2,748
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders	$	3.84	$	2.34	$	0.88
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders	$	3.81	$	2.32	$	0.87

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

In 2019, 2018 and 2017, 2 million, 6 million and 5 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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Share-Based Compensation Plans

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [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. These plans were approved by the Company’s shareholders.

At December 31, 2019, 111 million shares collectively were authorized for future grants under the Company’s share-based compensation plans. These awards are settled with treasury shares.

Employee stock options are granted to purchase shares of Company stock at the fair market value at the time of grant. These awards generally vest one-third each year over a three-year period, with a contractual term of 7-10 years. RSUs are stock awards that are granted to employees and entitle the holder to shares of common stock as the awards vest. The fair value of the stock option and RSU awards is determined and fixed on the grant date based on the Company’s stock price. PSUs are stock awards where the ultimate number of shares issued will be contingent on the Company’s performance against a pre-set objective or set of objectives. The fair value of each PSU is determined on the date of grant based on the Company’s stock price. For RSUs and PSUs, dividends declared during the vesting period are payable to the employees only upon vesting. Over the PSU performance period, the number of shares of stock that are expected to be issued will be adjusted based on the probability of achievement of a performance target and final compensation expense will be recognized based on the ultimate number of shares issued. RSU and PSU distributions will be in shares of Company stock after the end of the vesting or performance period, subject to the terms applicable to such awards. PSU awards generally vest after three years. Prior to 2018, RSU awards generally vested after three years; beginning with awards granted in 2018, RSU awards generally vest one-third each year over a three-year period.

Total pretax share-based compensation cost recorded in 2019, 2018 and 2017 was $417 million, $348 million and $312 million, respectively, with related income tax benefits of $57 million, $55 million and $57 million, respectively.

The Company uses the Black-Scholes option pricing model for determining the fair value of option grants. In applying this model, the Company uses both historical data and current market data to estimate the fair value of its options. The Black-Scholes model requires several assumptions including expected dividend yield, risk-free interest rate, volatility, and term of the options. The expected dividend yield is based on historical patterns of dividend payments. The risk-free interest rate is based on the rate at grant date of zero-coupon U.S. Treasury Notes with a term equal to the expected term of the option. Expected volatility is estimated using a blend of historical and implied volatility. The historical component is based on historical monthly price changes. The implied volatility is obtained from market data on the Company’s traded options. The expected life represents the amount of time that options granted are expected to be outstanding, based on historical and forecasted exercise behavior.

The weighted average exercise price of options granted in 2019, 2018 and 2017 was $80.05, $58.15 and $63.88 per option, respectively. The weighted average fair value of options granted in 2019, 2018 and 2017 was $10.63, $8.26 and $7.04 per option, respectively, and were determined using the following assumptions:

Years Ended December 31	2019		2018		2017
Expected dividend yield	3.2	%	3.4	%	3.6	%
Risk-free interest rate	2.4	%	2.9	%	2.0	%
Expected volatility	18.7	%	19.1	%	17.8	%
Expected life (years)	5.9		6.1		6.1

Summarized information relative to stock option plan activity (options in thousands) is as follows:

	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding January 1, 2019	23,807		$	51.89
Granted	2,796		80.05
Exercised	(8,119	)	44.48
Forfeited	(616	)	45.48
Outstanding December 31, 2019	17,868		$	59.88	6.48	$	555
Exercisable December 31, 2019	11,837		$	55.40	5.45	$	421

Additional information pertaining to stock option plans is provided in the table below:

Years Ended December 31	2019		2018		2017
Total intrinsic value of stock options exercised	$	295	$	348	$	236
Fair value of stock options vested	27		29		30
Cash received from the exercise of stock options	361		591		499

A summary of nonvested RSU and PSU activity (shares in thousands) is as follows:

	RSUs				PSUs
	Number of Shares		Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value
Nonvested January 1, 2019	16,128		$	58.85	2,039		$	59.42
Granted	4,811		80.08		763		83.90
Vested	(6,594	)	55.70		(748	)	57.87
Forfeited	(818	)	64.75		(82	)	66.68
Nonvested December 31, 2019	13,527		$	67.58	1,972		$	69.18

At December 31, 2019, there was $603 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 1.9 years. For segment reporting, share-based compensation costs are unallocated expenses.

XML

Segment Reporting - Consolidated Revenues by Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	$ 46,840	$ 42,294	$ 40,122
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	20,325	18,212	17,424
Europe, Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	12,707	12,213	11,478
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	3,583	3,212	3,122
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	3,207	2,184	1,586
Asia Pacific (other than Japan and China)
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	2,943	2,909	2,751
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	2,469	2,415	2,339
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	$ 1,606	$ 1,149	$ 1,422

XML

Acquisitions, Divestitures, Research Collaborations and License Agreements (Tables)

12 Months Ended

Dec. 31, 2019

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The estimated fair value of assets acquired and liabilities assumed from Antelliq is as follows:

($ in millions)	April 1, 2019
Cash and cash equivalents	$	31
Accounts receivable	73
Inventories	95
Property, plant and equipment	62
Identifiable intangible assets (useful lives ranging from 18-24 years) (1)	2,689
Deferred income tax liabilities	(520		)
Other assets and liabilities, net	(81		)
Total identifiable net assets	2,349
Goodwill (2)	1,302
Consideration transferred	$	3,651

⁽¹⁾  The estimated fair values of identifiable intangible assets relate primarily to trade names and were determined using an income approach. The future net cash flows were discounted to present value utilizing a discount rate of 11.5%. Actual cash flows are likely to be different than those assumed.

⁽²⁾ 

The goodwill recognized is largely attributable to anticipated synergies expected to arise after the acquisition and was allocated to the Animal Health segment. The goodwill is not deductible for tax purposes.

XML

Goodwill and Other Intangibles - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 01, 2019
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	$ 14,196	$ 13,104
Intangible asset impairment charge related to marketed product	705		$ 58
IPR&D impairment charges	172	152	483
Changes in estimated fair value	64	89
Amortization expense for intangible assets	2,000	3,100	3,200
Estimated aggregate amortization expense, 2020	1,600
Estimated aggregate amortization expense, 2021	1,500
Estimated aggregate amortization expense, 2022	1,500
Estimated aggregate amortization expense, 2023	1,500
Estimated aggregate amortization expense, 2024	1,400
Sivextro
Intangible Assets Excluding Goodwill [Line Items]
Intangible asset impairment charge related to marketed product	612
Intron A
Intangible Assets Excluding Goodwill [Line Items]
Intangible asset impairment charge related to marketed product			47
IOmet Pharma Ltd
Intangible Assets Excluding Goodwill [Line Items]
IPR&D impairment charges	155
Changes in estimated fair value	(11)
SmartCells Program
Intangible Assets Excluding Goodwill [Line Items]
IPR&D impairment charges		139
Changes in estimated fair value		(60)
uprifosbuvir
Intangible Assets Excluding Goodwill [Line Items]
IPR&D impairment charges			240
verubecestat
Intangible Assets Excluding Goodwill [Line Items]
IPR&D impairment charges			$ 226
Products and product rights
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	7,095	9,030
Products and product rights | Zerbaxa
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	2,400
Products and product rights | Sivextro
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	171
Products and product rights | Implanon/Nexplanon
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	412
Products and product rights | Dificid
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	312
Products and product rights | Gardasil/Gardasil 9
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	314
Products and product rights | Bridion
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	230
Products and product rights | Simponi
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	163
Trade names
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	2,682	102
Trade names | Animal Health
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	2,400
Licenses
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	2,361	$ 1,673
Licenses | Lenvima
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	956
Licenses | Lynparza
Intangible Assets Excluding Goodwill [Line Items]
Other intangibles, net	$ 955
Antelliq
Intangible Assets Excluding Goodwill [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				$ 2,689

XML

Other (Income) Expense, Net - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Component of Other Income / Expense of Nonoperating [Line Items]
Goodwill impairment charges	$ 162	$ 144
Write-down of assets held for sale		41
Loss on extinguishment of debt			$ 191
Interest paid	841	777	723
Healthcare Services
Component of Other Income / Expense of Nonoperating [Line Items]
Goodwill impairment charges	$ 162	144
CGRP receptor antagonists
Component of Other Income / Expense of Nonoperating [Line Items]
Gain (loss) on sale of clinical development programs		85
AstraZeneca LP
Component of Other Income / Expense of Nonoperating [Line Items]
Other income		99	$ 232
Patent litigation
Component of Other Income / Expense of Nonoperating [Line Items]
Litigation settlement, gain (loss)		$ 115

XML

Pension and Other Postretirement Benefit Plans - Summary of Expected Benefit Payments (Details) $ in Millions	Dec. 31, 2019 USD ($)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	$ 88
2021	92
2022	94
2023	98
2024	100
2025 — 2029	540
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	747
2021	717
2022	710
2023	718
2024	708
2025 — 2029	3,943
International | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	242
2021	225
2022	243
2023	250
2024	250
2025 — 2029	$ 1,417

XML

Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Investments, debt securities	$ 1,785	$ 7,261
Publicly traded equity securities	838	456
Derivative assets	288	454
Liabilities
Contingent consideration	767	788	$ 935
Derivative liabilities	97	160
Corporate notes and bonds
Assets
Investments, debt securities	621	4,920
Asset-backed securities
Assets
Investments, debt securities	$ 227	1,275
Liabilities
Primary weighted-average lives of investment collateral (or less)	5 years
U.S. government and agency securities
Assets
Investments, debt securities	$ 269	892
Foreign government bonds
Assets
Investments, debt securities	0	166
Mortgage-backed securities
Assets
Investments, debt securities	0	8
Fair Value, Measurements, Recurring
Assets
Investments	2,243	7,132
Other assets	380	585
Derivative assets	288	454
Total assets	2,911	8,171
Liabilities
Contingent consideration	767	788
Derivative liabilities	97	160
Total liabilities	864	948
Fair Value, Measurements, Recurring | Interest rate swap contracts
Assets
Derivative assets	15	0
Liabilities
Derivative liabilities	1	81
Fair Value, Measurements, Recurring | Foreign exchange contracts
Assets
Derivative assets	169	241
Liabilities
Derivative liabilities	95	74
Fair Value, Measurements, Recurring | Purchased currency options
Assets
Derivative assets	104	213
Liabilities
Derivative liabilities	1	5
Fair Value, Measurements, Recurring | Commercial paper
Assets
Investments, debt securities	668	0
Fair Value, Measurements, Recurring | Corporate notes and bonds
Assets
Investments, debt securities	621	4,835
Other assets	0	85
Fair Value, Measurements, Recurring | Asset-backed securities
Assets
Investments, debt securities	227	1,253
Other assets	0	22
Fair Value, Measurements, Recurring | U.S. government and agency securities
Assets
Investments, debt securities	209	731
Other assets	60	161
Fair Value, Measurements, Recurring | Foreign government bonds
Assets
Investments, debt securities	0	166
Fair Value, Measurements, Recurring | Mortgage-backed securities
Assets
Other assets	0	8
Fair Value, Measurements, Recurring | Publicly traded equity securities
Assets
Publicly traded equity securities	518	147
Other assets	320	309
Fair Value, Measurements, Recurring | Level 1
Assets
Investments	518	147
Other assets	380	364
Derivative assets	0	0
Total assets	898	511
Liabilities
Contingent consideration	0	0
Derivative liabilities	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Interest rate swap contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Purchased currency options
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Commercial paper
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Corporate notes and bonds
Assets
Investments, debt securities	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities
Assets
Investments, debt securities	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Level 1 | U.S. government and agency securities
Assets
Investments, debt securities	0	0
Other assets	60	55
Fair Value, Measurements, Recurring | Level 1 | Foreign government bonds
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Mortgage-backed securities
Assets
Other assets	0	0
Fair Value, Measurements, Recurring | Level 1 | Publicly traded equity securities
Assets
Publicly traded equity securities	518	147
Other assets	320	309
Fair Value, Measurements, Recurring | Level 2
Assets
Investments	1,725	6,985
Other assets	0	221
Derivative assets	288	454
Total assets	2,013	7,660
Liabilities
Contingent consideration	0	0
Derivative liabilities	97	160
Total liabilities	97	160
Fair Value, Measurements, Recurring | Level 2 | Interest rate swap contracts
Assets
Derivative assets	15	0
Liabilities
Derivative liabilities	1	81
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts
Assets
Derivative assets	169	241
Liabilities
Derivative liabilities	95	74
Fair Value, Measurements, Recurring | Level 2 | Purchased currency options
Assets
Derivative assets	104	213
Liabilities
Derivative liabilities	1	5
Fair Value, Measurements, Recurring | Level 2 | Commercial paper
Assets
Investments, debt securities	668	0
Fair Value, Measurements, Recurring | Level 2 | Corporate notes and bonds
Assets
Investments, debt securities	621	4,835
Other assets	0	85
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities
Assets
Investments, debt securities	227	1,253
Other assets	0	22
Fair Value, Measurements, Recurring | Level 2 | U.S. government and agency securities
Assets
Investments, debt securities	209	731
Other assets	0	106
Fair Value, Measurements, Recurring | Level 2 | Foreign government bonds
Assets
Investments, debt securities	0	166
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed securities
Assets
Other assets	0	8
Fair Value, Measurements, Recurring | Level 2 | Publicly traded equity securities
Assets
Publicly traded equity securities	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Level 3
Assets
Investments	0	0
Other assets	0	0
Derivative assets	0	0
Total assets	0	0
Liabilities
Contingent consideration	767	788
Derivative liabilities	0	0
Total liabilities	767	788
Fair Value, Measurements, Recurring | Level 3 | Interest rate swap contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Purchased currency options
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Corporate notes and bonds
Assets
Investments, debt securities	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities
Assets
Investments, debt securities	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. government and agency securities
Assets
Investments, debt securities	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign government bonds
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Mortgage-backed securities
Assets
Other assets	0	0
Fair Value, Measurements, Recurring | Level 3 | Publicly traded equity securities
Assets
Publicly traded equity securities	0	0
Other assets	$ 0	$ 0

XML

Acquisitions, Divestitures, Research Collaborations and License Agreements - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) $ in Millions		12 Months Ended
	Apr. 01, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Goodwill		$ 19,425	$ 18,253	$ 18,284
Antelliq
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Cash and cash equivalents	$ 31
Accounts receivable	73
Inventories	95
Property, plant and equipment	62
Identifiable intangible assets (useful lives ranging from 18-24 years)	2,689
Deferred income tax liabilities	(520)
Other assets and liabilities, net	(81)
Total identifiable net assets	2,349
Goodwill	1,302
Consideration transferred	$ 3,651
Antelliq | Measurement Input, Discount Rate
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Present value discount rate	0.115
Minimum
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Estimated useful life of intangible assets		2 years
Minimum | Antelliq
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Estimated useful life of intangible assets	18 years
Maximum
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Estimated useful life of intangible assets		24 years
Maximum | Antelliq
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Estimated useful life of intangible assets	24 years

XML

Taxes on Income (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Reconciliation Between Effective Tax Rate and U.S. Statutory Rate

A reconciliation between the effective tax rate and the U.S. statutory rate is as follows:

	2019					2018					2017
	Amount			Tax Rate		Amount			Tax Rate		Amount			Tax Rate
U.S. statutory rate applied to income before taxes	$	2,408		21.0	%	$	1,827		21.0	%	$	2,282		35.0	%
Differential arising from:
Foreign earnings	(1,020		)	(8.9	)	(245		)	(2.8	)	(1,654		)	(25.4	)
GILTI and the foreign-derived intangible income deduction	336			2.9		(25		)	(0.3	)	—			—
Tax settlements	(403		)	(3.5	)	(22		)	(0.3	)	(356		)	(5.5	)
R&D tax credit	(118		)	(1.0	)	(96		)	(1.1	)	(71		)	(1.1	)
State taxes	(2		)	—		201			2.3		77			1.2
Acquisition of Peloton	209			1.8		—			—		—			—
TCJA	117			1.0		289			3.3		2,625			40.3
Valuation allowances	113			1.0		269			3.1		632			9.7
Acquisition-related costs, including amortization	95			0.8		267			3.1		713			10.9
Restructuring	39			0.3		56			0.6		142			2.2
Other (1)	(87		)	(0.7	)	(13		)	(0.1	)	(287		)	(4.4	)
	$	1,687		14.7	%	$	2,508		28.8	%	$	4,103		62.9	%

⁽¹⁾ 

Other includes the tax effects of losses on foreign subsidiaries and miscellaneous items.

Income Before Taxes

Income before taxes consisted of:

Years Ended December 31	2019		2018		2017
Domestic	$	439	$	3,717	$	3,483
Foreign	11,025		4,984		3,038
	$	11,464	$	8,701	$	6,521

Taxes on Income

Taxes on income consisted of:

Years Ended December 31	2019			2018			2017
Current provision
Federal	$	514		$	536		$	5,585
Foreign	1,806			2,281			1,229
State	(77		)	200			(90		)
	2,243			3,017			6,724
Deferred provision
Federal	(330		)	(402		)	(2,958		)
Foreign	(240		)	(64		)	75
State	14			(43		)	262
	(556		)	(509		)	(2,621		)
	$	1,687		$	2,508		$	4,103

Deferred Income Taxes

Deferred income taxes at December 31 consisted of:

	2019					2018
	Assets			Liabilities		Assets			Liabilities
Product intangibles and licenses	$	442		$	1,778	$	720		$	1,640
Inventory related	32			354		32			377
Accelerated depreciation	—			594		—			582
Pensions and other postretirement benefits	785			191		565			151
Compensation related	322			—		291			—
Unrecognized tax benefits	109			—		174			—
Net operating losses and other tax credit carryforwards	897			—		715			—
Other	764			84		621			66
Subtotal	3,351			3,001		3,118			2,816
Valuation allowance	(1,100		)			(1,348		)
Total deferred taxes	$	2,251		$	3,001	$	1,770		$	2,816
Net deferred income taxes				$	750				$	1,046
Recognized as:
Other Assets	$	719				$	656
Deferred Income Taxes				$	1,470				$	1,702

Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	2019			2018			2017
Balance January 1	$	1,893		$	1,723		$	3,494
Additions related to current year positions	199			221			146
Additions related to prior year positions	46			142			520
Reductions for tax positions of prior years (1)	(454		)	(73		)	(1,038		)
Settlements (1)	(356		)	(91		)	(1,388		)
Lapse of statute of limitations (2)	(103		)	(29		)	(11		)
Balance December 31	$	1,225		$	1,893		$	1,723

⁽¹⁾  Amounts reflect the settlements with the IRS as discussed below.

⁽²⁾ Amount in 2019 includes $78 million related to the divestiture of Merck’s Consumer Care business in 2014.

XML

Nature of Operations (Details)	12 Months Ended
	Dec. 31, 2019 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	4

XML

Summary of Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Principles of Consolidation

Principles of Consolidation — The consolidated financial statements include the accounts of the Company and all of its subsidiaries in which a controlling interest is maintained. Intercompany balances and transactions are eliminated. Controlling interest is determined by majority ownership interest and the absence of substantive third-party participating rights or, in the case of variable interest entities, by majority exposure to expected losses, residual returns or both. For those consolidated subsidiaries where Merck ownership is less than 100%, the outside shareholders’ interests are shown as Noncontrolling interests in equity. Investments in affiliates over which the Company has significant influence but not a controlling interest, such as interests in entities owned equally by the Company and a third party that are under shared control, are carried on the equity basis.

Acquisitions

Acquisitions — In a business combination, the acquisition method of accounting requires that the assets acquired and liabilities assumed be recorded as of the date of the acquisition at their respective fair values with limited exceptions. Assets acquired and liabilities assumed in a business combination that arise from contingencies are generally recognized at fair value. If fair value cannot be determined, the asset or liability is recognized if probable and reasonably estimable; if these criteria are not met, no asset or liability is recognized. 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. Accordingly, the Company may be required to value assets at fair value measures that do not reflect the Company’s intended use of those assets. Any excess of the purchase price (consideration transferred) over the estimated fair values of net assets acquired is recorded as goodwill. Transaction costs and costs to restructure the acquired company are expensed as incurred. The operating results of the acquired business are reflected in the Company’s consolidated financial statements after the date of the acquisition. If the Company determines the assets acquired do not meet the definition of a business under the acquisition method of accounting, the transaction will be accounted for as an acquisition of assets rather than a business combination and, therefore, no goodwill will be recorded. In an asset acquisition, acquired in-process research and development (IPR&D) with no alternative future use is charged to expense and contingent consideration is not recognized at the acquisition date.

Foreign Currency Translation

Foreign Currency Translation — The net assets of international subsidiaries where the local currencies have been determined to be the functional currencies are translated into U.S. dollars using current exchange rates. The U.S. dollar effects that arise from translating the net assets of these subsidiaries at changing rates are recorded in the foreign currency translation account, which is included in Accumulated other comprehensive income (loss) (AOCI) and reflected as a separate component of equity. For those subsidiaries that operate in highly inflationary economies and for those subsidiaries where the U.S. dollar has been determined to be the functional currency, non-monetary foreign currency assets and liabilities are translated using historical rates, while monetary assets and liabilities are translated at current rates, with the U.S. dollar effects of rate changes included in Other (income) expense, net.

Cash Equivalents

Cash Equivalents — Cash equivalents are comprised of certain highly liquid investments with original maturities of less than three months.

Inventories

Inventories — Inventories are valued at the lower of cost or net realizable value. The cost of a substantial majority of U.S. pharmaceutical and vaccine inventories is determined using the last-in, first-out (LIFO) method for both financial reporting and tax purposes. The cost of all other inventories is determined using the first-in, first-out (FIFO) method. Inventories consist of currently marketed products, as well as certain inventories produced in preparation for product launches that are considered to have a high probability of regulatory approval. In evaluating the recoverability of inventories produced in preparation for product launches, the Company considers the likelihood that revenue will be obtained from the future sale of the related inventory together with the status of the product within the regulatory approval process.

Investments

Investments — Investments in marketable debt securities classified as available-for-sale are reported at fair value. Fair values of the Company’s investments in marketable debt securities are determined using quoted market prices in active markets for identical assets or liabilities or 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. Changes in fair value that are considered temporary are reported net of tax in Other Comprehensive Income (OCI). The Company considers available evidence in evaluating potential impairments of its investments in marketable debt securities, including the duration and extent to which fair value is less than cost. An other-than-temporary impairment has occurred if the Company does not expect to recover the entire amortized cost basis of the marketable debt security. If the Company does not intend to sell the impaired debt security, and it is not more likely than not it will be required to sell the debt security before the recovery of its amortized cost basis, the amount of the other-than-temporary impairment recognized in earnings, recorded in Other (income) expense, net, is limited to the portion attributed to credit loss. The remaining portion of the other-than-temporary impairment related to other factors is recognized in OCI. Realized gains and losses for debt securities are included in Other (income) expense, net.

Investments in publicly traded equity securities are reported at fair value determined using quoted market prices in active markets for identical assets or quoted prices for similar assets or other inputs that are observable or can be corroborated by observable market data. Changes in fair value are included in Other (income) expense, net.

Investments in equity securities without readily determinable fair values are recorded at cost, plus or minus subsequent observable price changes in orderly transactions for identical or similar investments, minus impairments. Such adjustments are recognized in Other (income) expense, net. Realized gains and losses for equity securities are included in Other (income) expense, net.

Revenue Recognition

Revenue Recognition — On January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers, and subsequent amendments (ASC 606 or new guidance), using the modified retrospective method. Comparative information for prior periods has not been restated and continues to be reported under the accounting standards in effect for those periods.

Recognition of revenue requires evidence of a contract, probable collection of sales proceeds and completion of substantially all performance obligations. Merck acts as the principal in substantially all of its customer arrangements and therefore records revenue on a gross basis. The majority of the Company’s contracts related to the Pharmaceutical and Animal Health segments have a single performance obligation - the promise to transfer goods. Shipping is considered immaterial in the context of the overall customer arrangement and damages or loss of goods in transit are rare. Therefore, shipping is not deemed a separately recognized performance obligation.

The vast majority of revenues from sales of products are recognized at a point in time when control of the goods is transferred to the customer, which the Company has determined is when title and risks and rewards of ownership transfer to the customer and the Company is entitled to payment. The Company recognizes revenue from the sales of vaccines to the Federal government for placement into vaccine stockpiles in accordance with Securities and Exchange Commission (SEC) Interpretation, Commission Guidance Regarding Accounting for Sales of Vaccines and BioTerror Countermeasures to the Federal Government for Placement into the Pediatric Vaccine Stockpile or the Strategic National Stockpile. This interpretation allows companies to recognize revenue for sales of vaccines into U.S. government stockpiles even though these sales might not meet the criteria for revenue recognition under other accounting guidance. For businesses within the Company’s Healthcare Services segment and certain services in the Animal Health segment, revenue is recognized over time, generally ratably over the contract term as services are provided. These service revenues are not material.

The nature of the Company’s business gives rise to several types of variable consideration including discounts and returns, which are estimated at the time of sale generally using the expected value method, although the most likely amount method is used for prompt pay discounts.

In the United States, sales discounts are issued to customers at the point-of-sale, through an intermediary wholesaler (known as chargebacks), or in the form of rebates. Additionally, sales are generally made with a limited right of return under certain conditions. Revenues are recorded net of provisions for sales discounts and returns, which are established at the time of sale. In addition, revenues are recorded net of time value of money discounts if collection of accounts receivable is expected to be in excess of one year.

The U.S. provision for aggregate customer discounts covering chargebacks and rebates was $11.8 billion in 2019, $10.7 billion in 2018 and $10.7 billion in 2017. Chargebacks are discounts that occur when a contracted customer purchases through an intermediary wholesaler. The contracted customer generally purchases product from the wholesaler at its contracted price plus a mark-up. The wholesaler, in turn, charges the Company back for the difference between the price initially paid by the wholesaler and the contract price paid to the wholesaler by the customer. The provision for chargebacks is based on expected sell-through levels by the Company’s wholesale customers to contracted customers, as well as estimated wholesaler inventory levels. Rebates are amounts 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. The provision for rebates is based on expected patient usage, as well as inventory levels in the distribution channel to determine the contractual obligation to the benefit providers. The Company uses historical customer segment utilization mix, sales forecasts, changes to product mix and price, inventory levels in the distribution channel, government pricing calculations and prior payment history in order to estimate the expected provision. Amounts accrued for aggregate customer discounts are evaluated on a quarterly basis through comparison of information provided by the wholesalers, health maintenance organizations, pharmacy benefit managers, federal and state agencies, and other customers to the amounts accrued. The accrued balances relative to the provisions for chargebacks and rebates included in Accounts

receivable and Accrued and other current liabilities were $233 million and $2.2 billion, respectively, at December 31, 2019 and were $245 million and $2.4 billion, respectively, at December 31, 2018.

Outside of the United States, variable consideration in the form of discounts and rebates are a combination of commercially-driven discounts in highly competitive product classes, discounts required to gain or maintain reimbursement, or legislatively mandated rebates. In certain European countries, legislatively mandated rebates are calculated based on an estimate of the government’s total unbudgeted spending and the Company’s specific payback obligation. Rebates may also be required based on specific product sales thresholds. The Company applies an estimated factor against its actual invoiced sales to represent the expected level of future discount or rebate obligations associated with the sale.

The Company maintains a returns policy that allows its U.S. pharmaceutical customers to return product within a specified period prior to and subsequent to the expiration date (generally, three to six months before and 12 months after product expiration). The estimate of the provision for returns is based upon historical experience with actual returns. Additionally, the Company considers factors such as levels of inventory in the distribution channel, product dating and expiration period, whether products have been discontinued, entrance in the market of generic competition, changes in formularies or launch of over-the-counter products, among others. Outside of the United States, returns are only allowed in certain countries on a limited basis.

Merck’s payment terms for U.S. pharmaceutical customers are typically 36 days from receipt of invoice and for U.S. animal health customers are typically 30 days from receipt of invoice; however, certain products, including Keytruda, have longer payment terms up to 90 days. Outside of the United States, payment terms are typically 30 days to 90 days, although certain markets have longer payment terms.

Depreciation

Depreciation — Depreciation is provided over the estimated useful lives of the assets, principally using the straight-line method. For tax purposes, accelerated tax methods are used. The estimated useful lives primarily range from 25 to 45 years for Buildings, and from 3 to 15 years for Machinery, equipment and office furnishings.

Advertising and Promotion Costs

Advertising and Promotion Costs — Advertising and promotion costs are expensed as incurred.

Software Capitalization

Software Capitalization — The Company capitalizes certain costs incurred in connection with obtaining or developing internal-use software including external direct costs of material and services, and payroll costs for employees directly involved with the software development. These costs are included in Property, plant and equipment. In addition, the Company capitalizes certain costs incurred to implement a cloud computing arrangement that is considered a service agreement, which are included in Other Assets. Capitalized software costs are amortized beginning when the software project is substantially complete and the asset is ready for its intended use. Capitalized software costs associated with projects that are being amortized over 6 to 10 years (including the Company’s on-going multi-year implementation of an enterprise-wide resource planning system) were $548 million and $439 million, net of accumulated amortization at December 31, 2019 and 2018, respectively. All other capitalized software costs are being amortized over periods ranging from 3 to 5 years. Costs incurred during the preliminary project stage and post-implementation stage, as well as maintenance and training costs, are expensed as incurred.

Goodwill

Goodwill — Goodwill represents the excess of the consideration transferred over the fair value of net assets of businesses acquired. Goodwill is assigned to reporting units and evaluated for impairment on at least an annual basis, or more frequently if impairment indicators exist, by first assessing qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the Company concludes it is more likely than not that the fair value of a reporting unit is less than its carrying amount, a quantitative fair value test is performed. If the carrying value of a reporting unit is greater than its fair value, a goodwill impairment charge will be recorded for the difference (up to the carrying value of goodwill).

Acquired Intangibles

Acquired Intangibles — Acquired intangibles include products and product rights, licenses, trade names and patents, which are initially recorded at fair value, assigned an estimated useful life, and amortized primarily on a straight-line basis over their estimated useful lives ranging from 2 to 24 years (see Note 8). The Company periodically evaluates whether current facts or circumstances indicate that the carrying values of its acquired intangibles may not

be recoverable. If such circumstances are determined to exist, an estimate of the undiscounted future cash flows of these assets, or appropriate asset groupings, is compared to the carrying value to determine whether an impairment exists. If the asset is determined to be impaired, the loss is measured based on the difference between the carrying value of the intangible asset and its fair value, which is determined based on the net present value of estimated future cash flows.

Acquired In-Process Research and Development

Acquired In-Process Research and Development — IPR&D that the Company acquires in conjunction with the acquisition of a business represents the fair value assigned to incomplete research projects which, at the time of acquisition, have not reached technological feasibility. The amounts are capitalized and are accounted for as indefinite-lived intangible assets, subject to impairment testing until completion or abandonment of the projects. Upon successful completion of each project, Merck will make a determination as to the then-useful life of the intangible asset, generally determined by the period in which the substantial majority of the cash flows are expected to be generated, and begin amortization. The Company evaluates IPR&D for impairment at least annually, or more frequently if impairment indicators exist, by performing a quantitative test that compares the fair value of the IPR&D intangible asset with its carrying value. If the fair value is less than the carrying amount, an impairment loss is recognized in operating results.

Contingent Consideration

Contingent Consideration — Certain of the Company’s acquisitions involve the potential for future payment of consideration that is contingent upon the achievement of performance milestones, including product development milestones and royalty payments on future product sales. If the transaction is accounted for as an acquisition of a business, the fair value of contingent consideration liabilities is determined at the acquisition date using unobservable inputs. These inputs include the estimated amount and timing of projected cash flows, the probability of success (achievement of the contingent event) and the risk-adjusted discount rate used to present value the probability-weighted cash flows. Subsequent to the acquisition date, at each reporting period until the contingency is resolved, the contingent consideration liability is remeasured at current fair value with changes (either expense or income) recorded in earnings. Significant events that increase or decrease the probability of achieving development and regulatory milestones or that increase or decrease projected cash flows will result in corresponding increases or decreases in the fair values of the related contingent consideration obligations. If the transaction is accounted for as an acquisition of an asset rather than a business, contingent consideration is not recognized at the acquisition date. In these instances, product development milestones are recognized upon achievement and sales-based milestones are recognized when the milestone is deemed probable by the Company of being achieved.

Research and Development

Research and Development — Research and development is expensed as incurred. Nonrefundable advance payments for goods and services that will be used in future research and development activities are expensed when the activity has been performed or when the goods have been received rather than when the payment is made. Research and development expenses include restructuring costs and IPR&D impairment charges. In addition, research and development expenses include expense or income related to changes in the estimated fair value measurement of liabilities for contingent consideration. Research and development expenses also include upfront and milestone payments related to asset acquisitions and licensing transactions involving clinical development programs that have not yet received regulatory approval.

Collaborative Arrangements

Collaborative Arrangements — Merck has entered into collaborative arrangements that provide the Company with varying rights to develop, produce and market products together with its collaborative partners. When Merck is the principal on sales transactions with third parties, the Company recognizes sales, cost of sales and selling, general and administrative expenses on a gross basis. Profit sharing amounts it pays to its collaborative partners are recorded within Cost of sales. When the collaborative partner is the principal on sales transactions with third parties, the Company records profit sharing amounts received from its collaborative partners as alliance revenue (within Sales). Alliance revenue is recorded net of cost of sales and includes an adjustment to share commercialization costs between the partners in accordance with the collaboration agreement. The adjustment is determined by comparing the commercialization costs Merck has incurred directly and reported within Selling, general and administrative expenses with the costs the collaborative partner has incurred. Research and development costs Merck incurs related to collaborations are recorded within Research and development expenses. Cost reimbursements to the collaborative partner or payments received from the collaborative partner to share these costs pursuant to the terms of the collaboration agreements are recorded as increases or decreases to Research and development expenses.

In addition, the terms of the collaboration agreements may require the Company to make payments based upon the achievement of certain developmental, regulatory approval or commercial milestones. Upfront and milestone payments payable by Merck to collaborative partners prior to regulatory approval are expensed as incurred and included in Research and development expenses. Payments due to collaborative partners upon or subsequent to regulatory approval are capitalized and amortized over the estimated useful life of the corresponding intangible asset to Cost of sales provided that future cash flows support the amounts capitalized. Sales-based milestones payable by Merck to collaborative partners are accrued and capitalized, subject to cumulative amortization catch-up, when probable of being achieved. The amortization catch-up is calculated either from the time of the first regulatory approval for indications that were unapproved at the time the collaboration was formed, or from time of the formation of the collaboration for approved products. The related intangible asset that is recognized is amortized to Cost of sales over its remaining useful life, subject to impairment testing.

Share-Based Compensation

Share-Based Compensation — The Company expenses all share-based payments to employees over the requisite service period based on the grant-date fair value of the awards.

Restructuring Costs

Restructuring Costs — The Company records liabilities for costs associated with exit or disposal activities in the period in which the liability is incurred. In accordance with existing benefit arrangements, employee termination costs are accrued when the restructuring actions are probable and estimable. When accruing these costs, the Company will recognize the amount within a range of costs that is the best estimate within the range. When no amount within the range is a better estimate than any other amount, the Company recognizes the minimum amount within the range. Costs for one-time termination benefits in which the employee is required to render service until termination in order to receive the benefits are recognized ratably over the future service period.

Contingencies and Legal Defense Costs

Contingencies and Legal Defense Costs — The Company records accruals for contingencies and legal defense costs expected to be incurred in connection with a loss contingency when it is probable that a liability has been incurred and the amount can be reasonably estimated.

Taxes on Income

Taxes on Income — Deferred taxes are recognized for the future tax effects of temporary differences between financial and income tax reporting based on enacted tax laws and rates. The Company evaluates tax positions to determine whether the benefits of tax positions are more likely than not of being sustained upon audit based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained upon audit, the Company recognizes the largest amount of the benefit that is greater than 50% likely of being realized upon ultimate settlement in the financial statements. For tax positions that are not more likely than not of being sustained upon audit, the Company does not recognize any portion of the benefit in the financial statements. The Company recognizes interest and penalties associated with uncertain tax positions as a component of Taxes on income in the Consolidated Statement of Income. The Company accounts for the tax effects of the tax on global intangible low-taxed income (GILTI) of certain foreign subsidiaries in the income tax provision in the period the tax arises.

Use of Estimates

Use of Estimates — The consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States (GAAP) and, accordingly, include certain amounts that are based on management’s best estimates and judgments. Estimates are used when accounting for amounts recorded in connection with acquisitions, including initial fair value determinations of assets and liabilities, primarily IPR&D, other intangible assets and contingent consideration, as well as subsequent fair value measurements. Additionally, estimates are used in determining such items as provisions for sales discounts and returns, depreciable and amortizable lives, recoverability of inventories, including those produced in preparation for product launches, amounts recorded for contingencies, environmental liabilities, accruals for contingent sales-based milestone payments and other reserves, pension and other postretirement benefit plan assumptions, share-based compensation assumptions, restructuring costs, impairments of long-lived assets (including intangible assets and goodwill) and investments, and taxes on income. Because of the uncertainty inherent in such estimates, actual results may differ from these estimates.

Reclassifications

Reclassifications — Certain reclassifications have been made to prior year amounts to conform to the current year presentation.

Recently Adopted Accounting Standards

Recently Adopted Accounting Standards — In February 2016, the Financial Accounting Standards Board (FASB) issued new accounting guidance for the accounting and reporting of leases (ASU 2016-02) and subsequently issued several updates to the new guidance (ASC 842 or new leasing guidance). The new leasing guidance requires

that lessees recognize a right-of-use asset and a lease liability for each of its leases (other than leases that meet the definition of a short-term lease). Leases are classified as either operating or finance. Operating leases result in straight-line expense in the income statement (similar to previous operating leases), while finance leases result in more expense being recognized in the earlier years of the lease term (similar to previous capital leases). The Company adopted the new standard on January 1, 2019 using a modified retrospective approach. Merck elected the transition method that allows for application of the standard at the adoption date rather than at the beginning of the earliest comparative period presented in the financial statements. The Company also elected available practical expedients. Upon adoption, the Company recognized $1.1 billion of additional assets and related liabilities on its consolidated balance sheet (see Note 9). The adoption of the new leasing guidance did not impact the Company’s consolidated statements of income or of cash flows.

In April 2018, the FASB issued new guidance on the accounting for costs incurred to implement a cloud computing arrangement that is considered a service arrangement. The new guidance requires the capitalization of such costs, aligning it with the accounting for costs associated with developing or obtaining internal-use software. The Company adopted the new standard in the third quarter of 2019 using prospective application for eligible costs, which were immaterial.

In August 2018, the FASB issued new guidance modifying the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The new guidance removes disclosures that no longer are considered cost beneficial, clarifies the specific requirements of certain disclosures, and adds disclosure requirements identified as relevant. The Company elected to early adopt the new guidance in 2019 on a retrospective basis resulting in minor changes to its employee benefit plan disclosures (see Note 13).

Also, in August 2018, the FASB issued new guidance on fair value measurements that adds, removes, and modifies certain disclosure requirements. The Company elected to early adopt the new guidance in 2019 resulting in minor changes to its fair value disclosures (see Note 6).

Recently Issued Accounting Standards Not Yet Adopted — In June 2016, the FASB issued new guidance on the accounting for credit losses on financial instruments. The new 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 Company adopted the new guidance effective January 1, 2020. There was no impact to the Company’s consolidated financial statements upon adoption.

In November 2018, the FASB issued new guidance for collaborative arrangements intended to reduce diversity in practice by clarifying whether certain transactions between collaborative arrangement participants should be accounted for under revenue recognition guidance (ASC 606). The Company adopted the new guidance effective January 1, 2020, which will result in minor changes to the footnote presentation of information related to the Company’s collaborative arrangements.

In December 2019, the FASB issued amended guidance on the accounting and reporting of income taxes. The guidance is intended to simplify the accounting for income taxes by removing exceptions related to certain intraperiod tax allocations and deferred tax liabilities; clarifying guidance primarily related to evaluating the step-up tax basis for goodwill in a business combination; and reflecting enacted changes in tax laws or rates in the annual effective tax rate. The amended guidance is effective for interim and annual periods in 2021. Early adoption is permitted. The application of the amendments in the new guidance are to be applied on a retrospective basis, on a modified retrospective basis through a cumulative-effect adjustment to retained earnings or prospectively, depending on the amendment. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In January 2020, the FASB issued new guidance intended to clarify certain interactions between accounting standards related to equity securities, equity method investments and certain derivatives. The guidance addresses accounting for the transition into and out of the equity method of accounting and measuring certain purchased options and forward contracts to acquire investments. The new guidance is effective for interim and annual periods in 2021 and is to be applied prospectively. Early adoption is permitted. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

XML

Segment Reporting - Reconciliation of Segment Profits to Income Before Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Interest income	$ 274	$ 343	$ 385
Interest expense	(893)	(772)	(754)
Depreciation and amortization	(3,652)	(4,519)	(4,676)
Research and development	(9,872)	(9,752)	(10,339)
Restructuring costs	(638)	(632)	(776)
Loss on extinguishment of debt			(191)
Income Before Taxes	11,464	8,701	6,521
Total segment profits
Segment Reporting Information [Line Items]
Depreciation and amortization	(256)	(335)	(212)
Income Before Taxes	29,926	26,633	24,845
Total segment profits | Pharmaceutical segment
Segment Reporting Information [Line Items]
Depreciation and amortization	(137)	(243)	(125)
Income Before Taxes	28,324	24,871	23,018
Total segment profits | Animal Health
Segment Reporting Information [Line Items]
Depreciation and amortization	(109)	(82)	(75)
Income Before Taxes	1,609	1,659	1,552
Total segment profits | Other segments
Segment Reporting Information [Line Items]
Depreciation and amortization	(10)	(10)	(12)
Income Before Taxes	(7)	103	275
Other profits
Segment Reporting Information [Line Items]
Income Before Taxes	363	6	26
Unallocated
Segment Reporting Information [Line Items]
Interest income	274	343	385
Interest expense	(893)	(772)	(754)
Depreciation and amortization	(1,573)	(1,334)	(1,378)
Research and development	(9,499)	(9,432)	(10,004)
Amortization of purchase accounting adjustments	(1,419)	(2,664)	(3,056)
Restructuring costs	(638)	(632)	(776)
Charge related to the termination of a collaboration with Samsung	0	(423)	0
Loss on extinguishment of debt	0	0	(191)
Other unallocated, net	$ (5,077)	$ (3,024)	$ (2,576)

XML

Taxes on Income

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Taxes on Income

Taxes on Income

A reconciliation between the effective tax rate and the U.S. statutory rate is as follows:

	2019					2018					2017
	Amount			Tax Rate		Amount			Tax Rate		Amount			Tax Rate
U.S. statutory rate applied to income before taxes	$	2,408		21.0	%	$	1,827		21.0	%	$	2,282		35.0	%
Differential arising from:
Foreign earnings	(1,020		)	(8.9	)	(245		)	(2.8	)	(1,654		)	(25.4	)
GILTI and the foreign-derived intangible income deduction	336			2.9		(25		)	(0.3	)	—			—
Tax settlements	(403		)	(3.5	)	(22		)	(0.3	)	(356		)	(5.5	)
R&D tax credit	(118		)	(1.0	)	(96		)	(1.1	)	(71		)	(1.1	)
State taxes	(2		)	—		201			2.3		77			1.2
Acquisition of Peloton	209			1.8		—			—		—			—
TCJA	117			1.0		289			3.3		2,625			40.3
Valuation allowances	113			1.0		269			3.1		632			9.7
Acquisition-related costs, including amortization	95			0.8		267			3.1		713			10.9
Restructuring	39			0.3		56			0.6		142			2.2
Other (1)	(87		)	(0.7	)	(13		)	(0.1	)	(287		)	(4.4	)
	$	1,687		14.7	%	$	2,508		28.8	%	$	4,103		62.9	%

⁽¹⁾  Other includes the tax effects of losses on foreign subsidiaries and miscellaneous items.

The Tax Cuts and Jobs Act (TCJA) was enacted in December 2017. Among other provisions, the TCJA reduced the U.S. federal corporate statutory tax rate from 35% to 21% effective January 1, 2018, required companies to pay a one-time transition tax on undistributed earnings of certain foreign subsidiaries, and created new taxes on certain foreign sourced earnings. The Company reflected the impact of the TCJA in its 2017 financial statements. However, since application of certain provisions of the TCJA remained subject to further interpretation, in certain instances the Company made reasonable estimates of the effects of the TCJA, which were since finalized as described below.

The one-time transition tax is based on the Company’s post-1986 undistributed earnings and profits (E&P). For a substantial portion of these undistributed E&P, the Company had not previously provided deferred taxes as these earnings were deemed by Merck to be retained indefinitely by subsidiary companies for reinvestment. The Company recorded a provisional amount in 2017 for its one-time transition tax liability of $5.3 billion. This provisional amount was reduced by the reversal of $2.0 billion of deferred taxes that were previously recorded in connection with the merger of Schering-Plough Corporation in 2009 for certain undistributed foreign E&P. On the basis of revised calculations of post-1986 undistributed foreign E&P and finalization of the amounts held in cash or other specified assets, the Company recognized a measurement-period adjustment of $124 million in 2018 related to the transition tax obligation, with a corresponding adjustment to income tax expense during the period, resulting in a revised transition tax obligation of $5.5 billion. In 2019, the Company recorded additional charges of $117 million related to the finalization of treasury regulations associated with the TCJA. As permitted under the TCJA, the Company has elected to pay the one-time transition tax over a period of eight years through 2025. The Company’s remaining transition tax liability, which has been reduced by payments and the utilization of foreign tax credits, was $3.4 billion at December 31, 2019, of which $390 million is included in Income taxes payable and the remainder of $3.0 billion is included in Other Noncurrent Liabilities. In 2017, the Company remeasured its deferred tax assets and liabilities at the new federal statutory tax rate of 21%, which resulted in a provisional deferred tax benefit of $779 million. On the basis of clarifications to the deferred tax benefit calculation, the Company recorded measurement-period adjustments in 2018 of $32 million related to deferred income taxes.

The foreign earnings tax rate differentials in the tax rate reconciliation above primarily reflect the impacts of operations in jurisdictions with different tax rates than the United States, particularly Ireland and Switzerland, as well as Singapore and Puerto Rico which operate under tax incentive grants (which begin to expire in 2022), where the earnings had been indefinitely reinvested, thereby yielding a favorable impact on the effective tax rate compared with the U.S. statutory rate of 21% in 2019 and 2018 and 35% in 2017. The foreign earnings tax rate differentials do not include the impact of intangible asset impairment charges, amortization of purchase accounting adjustments or restructuring costs. These items are presented separately as they each represent a significant, separately disclosed pretax cost or charge, and a substantial portion of each of these items relates to jurisdictions with lower tax rates than the United States. Therefore, the impact of recording these expense items in lower tax rate jurisdictions is an unfavorable impact on the effective tax rate compared to the U.S. statutory rate.

Income before taxes consisted of:

Years Ended December 31	2019		2018		2017
Domestic	$	439	$	3,717	$	3,483
Foreign	11,025		4,984		3,038
	$	11,464	$	8,701	$	6,521

Taxes on income consisted of:

Years Ended December 31	2019			2018			2017
Current provision
Federal	$	514		$	536		$	5,585
Foreign	1,806			2,281			1,229
State	(77		)	200			(90		)
	2,243			3,017			6,724
Deferred provision
Federal	(330		)	(402		)	(2,958		)
Foreign	(240		)	(64		)	75
State	14			(43		)	262
	(556		)	(509		)	(2,621		)
	$	1,687		$	2,508		$	4,103

Deferred income taxes at December 31 consisted of:

	2019					2018
	Assets			Liabilities		Assets			Liabilities
Product intangibles and licenses	$	442		$	1,778	$	720		$	1,640
Inventory related	32			354		32			377
Accelerated depreciation	—			594		—			582
Pensions and other postretirement benefits	785			191		565			151
Compensation related	322			—		291			—
Unrecognized tax benefits	109			—		174			—
Net operating losses and other tax credit carryforwards	897			—		715			—
Other	764			84		621			66
Subtotal	3,351			3,001		3,118			2,816
Valuation allowance	(1,100		)			(1,348		)
Total deferred taxes	$	2,251		$	3,001	$	1,770		$	2,816
Net deferred income taxes				$	750				$	1,046
Recognized as:
Other Assets	$	719				$	656
Deferred Income Taxes				$	1,470				$	1,702

The Company has net operating loss (NOL) carryforwards in several jurisdictions. As of December 31, 2019, $762 million of deferred taxes on NOL carryforwards relate to foreign jurisdictions. Valuation allowances of $1.1 billion have been established on these foreign NOL carryforwards and other foreign deferred tax assets. In addition, the Company has $135 million of deferred tax assets relating to various U.S. tax credit carryforwards and NOL carryforwards, all of which are expected to be fully utilized prior to expiry.

Income taxes paid in 2019, 2018 and 2017 were $4.5 billion, $1.5 billion and $4.9 billion, respectively. Tax benefits relating to stock option exercises were $65 million in 2019, $77 million in 2018 and $73 million in 2017.

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	2019			2018			2017
Balance January 1	$	1,893		$	1,723		$	3,494
Additions related to current year positions	199			221			146
Additions related to prior year positions	46			142			520
Reductions for tax positions of prior years (1)	(454		)	(73		)	(1,038		)
Settlements (1)	(356		)	(91		)	(1,388		)
Lapse of statute of limitations (2)	(103		)	(29		)	(11		)
Balance December 31	$	1,225		$	1,893		$	1,723

⁽¹⁾  Amounts reflect the settlements with the IRS as discussed below.

⁽²⁾ Amount in 2019 includes $78 million related to the divestiture of Merck’s Consumer Care business in 2014.

If the Company were to recognize the unrecognized tax benefits of $1.2 billion at December 31, 2019, the income tax provision would reflect a favorable net impact of $1.1 billion.

The Company is under examination by numerous tax authorities in various jurisdictions globally. The Company believes that it is reasonably possible that the total amount of unrecognized tax benefits as of December 31, 2019 could decrease by up to approximately $40 million in the next 12 months as a result of various audit closures, settlements or the expiration of the statute of limitations. 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.

Interest and penalties associated with uncertain tax positions amounted to a (benefit) expense of $(101) million in 2019, $51 million in 2018 and $183 million in 2017. These amounts reflect the beneficial impacts of various tax settlements, including those discussed below. Liabilities for accrued interest and penalties were $243 million and $372 million as of December 31, 2019 and 2018, respectively.

In 2019, the Internal Revenue Service (IRS) concluded its examinations of Merck’s 2012-2014 U.S. federal income tax returns. As a result, the Company was required to make a payment of $107 million. The Company’s reserves for unrecognized tax benefits for the years under examination exceeded the adjustments relating to this examination period and therefore the Company recorded a $364 million net tax benefit in 2019. This net benefit reflects reductions in reserves for unrecognized tax benefits for tax positions relating to the years that were under examination, partially offset by additional reserves for tax positions not previously reserved for.

In 2017, the IRS concluded its examinations of Merck’s 2006-2011 U.S. federal income tax returns. As a result, the Company was required to make a payment of approximately $2.8 billion. The Company’s reserves for unrecognized tax benefits for the years under examination exceeded the adjustments relating to this examination period and therefore the Company recorded a net $234 million tax benefit in 2017. This net benefit reflects reductions in reserves for unrecognized tax benefits for tax positions relating to the years that were under examination, partially offset by additional reserves for tax positions not previously reserved for, as well as adjustments to reserves for unrecognized tax benefits relating to years which remain open to examination that are affected by this settlement.

The IRS is currently conducting examinations of the Company’s tax returns for the years 2015 and 2016. In addition, various state and foreign tax examinations are in progress and for these jurisdictions, the Company’s income tax returns are open for examination for the period 2003 through 2019.

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Equity

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Equity

Equity

The Merck certificate of incorporation authorizes 6,500,000,000 shares of common stock and 20,000,000 shares of preferred stock.

Capital Stock

A summary of common stock and treasury stock transactions (shares in millions) is as follows:

	2019			2018			2017
	Common Stock	Treasury Stock		Common Stock	Treasury Stock		Common Stock	Treasury Stock
Balance January 1	3,577	985		3,577	880		3,577	828
Purchases of treasury stock	—	66		—	122		—	67
Issuances (1)	—	(13	)	—	(17	)	—	(15	)
Balance December 31	3,577	1,038		3,577	985		3,577	880

⁽¹⁾   Issuances primarily reflect activity under share-based compensation plans.

On October 25, 2018, the Company entered into accelerated share repurchase (ASR) agreements with two third-party financial institutions (Dealers). Under the ASR agreements, Merck agreed to purchase $5 billion of Merck’s common stock, in total, with an initial delivery of 56.7 million shares of Merck’s common stock, based on the then-current market price, made by the Dealers to Merck, and payments of $5 billion made by Merck to the Dealers on October 29, 2018, which were funded with existing cash and investments, as well as short-term borrowings. The payments to the Dealers were recorded as reductions to shareholders’ equity, consisting of a $4 billion increase in treasury stock, which reflected the value of the initial 56.7 million shares received on October 29, 2018, and a $1 billion decrease in other-paid-in capital, which reflected the value of the stock held back by the Dealers pending final settlement. Upon settlement of the ASR agreements in April 2019, Merck received an additional 7.7 million shares as determined by the average daily volume weighted-average price of Merck’s common stock during the term of the ASR program, less a negotiated discount, bringing the total shares received by Merck under this program to 64.4 million.

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Inventories - Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Finished goods	$ 1,772	$ 1,658
Raw materials and work in process	5,650	5,004
Supplies	207	194
Total (approximates current cost)	7,629	6,856
(Decrease) increase to LIFO cost	(171)	1
Total current and noncurrent inventories	7,458	6,857
Recognized as:
Inventories	5,978	5,440
Other assets	$ 1,480	$ 1,417

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Pension and Other Postretirement Benefit Plans - Summary of Health Care Cost Trend Rate Assumptions for Other Postretirement Benefit Plans (Details) - Other Postretirement Benefits	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year	6.80%	7.00%
Rate to which the cost trend rate is assumed to decline	4.50%	4.50%

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Pension and Other Postretirement Benefit Plans - Fair Values of Other Postretirement Benefit Plan Assets (Details) - Other Postretirement Benefits - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	$ 1,102	$ 968	$ 1,114
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	74	94
Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	343	295
Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	81	79
Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	17	16
Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	3
Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	225	200
Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	196	141
Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	149	116
Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	17	24
Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	312	307
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	52	78
Level 1 | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	19	16
Level 1 | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	15	12
Level 1 | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	1	1
Level 1 | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 1 | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	225	200
Level 1 | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 1 | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 1 | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	362	281
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 2 | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 2 | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 2 | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 2 | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 2 | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 2 | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	196	141
Level 2 | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	149	116
Level 2 | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	17	24
Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 3 | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 3 | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 3 | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 3 | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 3 | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 3 | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 3 | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 3 | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
NAV
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	428	380
NAV | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	22	16
NAV | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	324	279
NAV | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	66	67
NAV | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	16	15
NAV | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	3
NAV | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
NAV | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
NAV | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
NAV | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	$ 0	$ 0

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Financial Instruments - Information on Debt and Equity Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	$ 1,768	$ 7,340
Debt securities, gross unrealized gains	17	6
Debt securities, gross unrealized losses	0	(85)
Debt securities, fair value	1,785	7,261
Publicly traded equity securities, fair value	838	456
Total debt and publicly traded equity securities, fair value	2,623	7,717
Unrealized net gains	160	(35)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	668	0
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	0	0
Debt securities, fair value	668	0
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	608	4,985
Debt securities, gross unrealized gains	13	3
Debt securities, gross unrealized losses	0	(68)
Debt securities, fair value	621	4,920
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	266	895
Debt securities, gross unrealized gains	3	2
Debt securities, gross unrealized losses	0	(5)
Debt securities, fair value	269	892
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	226	1,285
Debt securities, gross unrealized gains	1	1
Debt securities, gross unrealized losses	0	(11)
Debt securities, fair value	227	1,275
Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	0	167
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	0	(1)
Debt securities, fair value	0	166
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	0	8
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	0	0
Debt securities, fair value	0	8
Fair Value, Measurements, Recurring | Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Debt securities, fair value	621	4,835
Fair Value, Measurements, Recurring | U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, fair value	209	731
Fair Value, Measurements, Recurring | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, fair value	227	1,253
Fair Value, Measurements, Recurring | Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Debt securities, fair value	0	166
Fair Value, Measurements, Recurring | Publicly traded equity securities
Debt Securities, Available-for-sale [Line Items]
Publicly traded equity securities, fair value	$ 518	$ 147

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Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Calculations of Earnings Per Share

The calculations of earnings per share (shares in millions) are as follows:

Years Ended December 31	2019		2018		2017
Net income attributable to Merck & Co., Inc.	$	9,843	$	6,220	$	2,394
Average common shares outstanding	2,565		2,664		2,730
Common shares issuable (1)	15		15		18
Average common shares outstanding assuming dilution	2,580		2,679		2,748
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders	$	3.84	$	2.34	$	0.88
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders	$	3.81	$	2.32	$	0.87

⁽¹⁾ 

Issuable primarily under share-based compensation plans.

XML

Summary of Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]
Product return period and expiration	12 months
Customer discounts	$ 11,800	$ 10,700	$ 10,700
Accrual for chargebacks reflected as direct reduction to accounts receivable	233	245
Accrual for rebates included in accrued and other current liabilities	2,200	2,400
Depreciation	1,700	1,400	1,500
Advertising and promotion costs	2,100	2,100	2,200
Decrease in deferred income taxes	(1,470)	(1,702)
Accumulated other comprehensive loss	6,193	5,545
Net periodic defined benefit plan (credit) cost other than service cost	(545)	(512)	$ (512)
Operating lease, right-of-use assets	1,073
Operating lease, liability	1,004
Accounting Standards Update 2016-02
Summary Of Significant Accounting Policies [Line Items]
Operating lease, right-of-use assets				$ 1,100
Operating lease, liability				$ 1,100
Enterprise wide resource planning system
Summary Of Significant Accounting Policies [Line Items]
Unamortized capitalized software costs	$ 548	$ 439
Minimum
Summary Of Significant Accounting Policies [Line Items]
Product return period	3 months
Estimated useful life of intangible assets	2 years
Minimum | Enterprise wide resource planning system
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets	6 years
Minimum | Capitalized Software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets	3 years
Minimum | Buildings
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment	25 years
Minimum | Machinery, equipment and office furnishings
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment	3 years
Minimum | United States | Pharmaceutical segment
Summary Of Significant Accounting Policies [Line Items]
Payment terms	36 days
Minimum | United States | Animal Health
Summary Of Significant Accounting Policies [Line Items]
Payment terms	30 days
Minimum | Outside of the United States
Summary Of Significant Accounting Policies [Line Items]
Payment terms	30 days
Maximum
Summary Of Significant Accounting Policies [Line Items]
Product return period	6 months
Estimated useful life of intangible assets	24 years
Maximum | Enterprise wide resource planning system
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets	10 years
Maximum | Capitalized Software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets	5 years
Maximum | Buildings
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment	45 years
Maximum | Machinery, equipment and office furnishings
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment	15 years
Maximum | Outside of the United States
Summary Of Significant Accounting Policies [Line Items]
Payment terms	90 days
Keytruda | Maximum | United States
Summary Of Significant Accounting Policies [Line Items]
Payment terms	90 days

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Collaborative Arrangements - Narrative (Details) - USD ($) $ in Millions	1 Months Ended									12 Months Ended			17 Months Ended	35 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jan. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Jul. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Jan. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research and development										$ 9,872	$ 9,752	$ 10,339
Noncurrent liabilities				$ 11,970		$ 12,041				11,970	12,041		$ 12,041
Amortization expense for intangible assets										2,000	3,100	3,200
Other intangibles, net				14,196		13,104				14,196	13,104		13,104
Estimated aggregate amortization expense, 2020				1,600						1,600
Estimated aggregate amortization expense, 2021				1,500						1,500
Estimated aggregate amortization expense, 2022				1,500						1,500
Estimated aggregate amortization expense, 2023				1,500						1,500
Estimated aggregate amortization expense, 2024				1,400						1,400
Licenses
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Other intangibles, net				2,361		1,673				2,361	1,673		1,673
Lynparza | Licenses
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Other intangibles, net				955						955
Lenvima | Licenses
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Other intangibles, net				956						956
Adempas | Other Intangible Assets, Net
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Intangible assets				883						883
AstraZeneca
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront and milestone payments									$ 1,600
Payments to acquire intangible assets				100		400		$ 250	$ 750
Research and development												$ 2,350
AstraZeneca | Sales-Based Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contingent payments collaborative arrangement										3,100
AstraZeneca | Regulatory Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contingent payments collaborative arrangement										1,700
AstraZeneca | Lynparza | Sales-Based Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Probable future contingent payments collaborative arrangement										300
Liabilities				300						300
Milestone payments made to collaborative partner										200	250		700
AstraZeneca | Lynparza | Regulatory Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone payments made to collaborative partner										30	140
Eisai
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront and milestone payments							$ 750
Payments to acquire intangible assets					$ 325
Research and development											1,400
Eisai | Sales-Based Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contingent payments collaborative arrangement										3,000
Eisai | Regulatory Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contingent payments collaborative arrangement										135
Eisai | Lenvima | Sales-Based Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Probable future contingent payments collaborative arrangement										682	268
Liabilities				$ 682						682
Milestone payments made to collaborative partner										50
Eisai | Lenvima | Regulatory Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone payments made to collaborative partner											250
Eisai | Forecast
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payments to acquire intangible assets	$ 125	$ 200												$ 650
Bayer AG | Sales-Based Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contingent payments collaborative arrangement										$ 400
Bayer AG | Adempas | Sales-Based Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Probable future contingent payments collaborative arrangement											375
Noncurrent liabilities						$ 375					375		$ 375
Milestone payments made to collaborative partner											$ 350
Subsequent Event | AstraZeneca | Lynparza | Sales-Based Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone payments made to collaborative partner			$ 250
Subsequent Event | Eisai | Lenvima | Sales-Based Milestones
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone payments made to collaborative partner			$ 150

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Loans Payable, Long-Term Debt and Leases - Maturity Schedule (Details) $ in Millions	Dec. 31, 2019 USD ($)
Leases [Abstract]
2020	$ 264
2021	200
2022	168
2023	113
2024	89
Thereafter	297
Total lease payments	1,131
Less: imputed interest	127
Total operating lease liability	$ 1,004

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Share-Based Compensation Plans - Summary of Information Relative to Stock Option Plan Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Options, Outstanding, January 1 (in shares)	23,807
Number of Options, Granted (in shares)	2,796
Number of Options, Exercised (in shares)	(8,119)
Number of Options, Forfeited (in shares)	(616)
Number of Options, Outstanding, December 31 (in shares)	17,868	23,807
Number of Options, Exercisable (in shares)	11,837
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Options Outstanding, January 1 (in dollars per share)	$ 51.89
Weighted Average Exercise Price, Granted (in dollars per share)	80.05	$ 58.15	$ 63.88
Weighted Average Exercise Price, Exercised (in dollars per share)	44.48
Weighted Average Exercise Price, Forfeited (in dollars per share)	45.48
Weighted Average Exercise Price, Options Outstanding, December 31 (in dollars per share)	59.88	$ 51.89
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 55.40
Weighted Average Remaining Contractual Term, Outstanding	6 years 5 months 23 days
Weighted Average Remaining Contractual Term, Exercisable	5 years 5 months 12 days
Aggregate Intrinsic Value, Outstanding	$ 555
Aggregate Intrinsic Value, Exercisable	$ 421

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Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 48	$ 57	$ 57
Interest cost	69	69	81
Expected return on plan assets	(72)	(83)	(78)
Amortization of unrecognized prior service cost	(78)	(84)	(98)
Net loss amortization	(10)	1	1
Termination benefits	5	3	8
Curtailments	(11)	(8)	(31)
Settlements	0	0	0
Net periodic benefit cost (credit)	(49)	(45)	(60)
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	293	326	312
Interest cost	458	432	454
Expected return on plan assets	(817)	(851)	(862)
Amortization of unrecognized prior service cost	(49)	(50)	(53)
Net loss amortization	151	232	180
Termination benefits	31	19	44
Curtailments	14	10	3
Settlements	0	5	0
Net periodic benefit cost (credit)	81	123	78
International | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	238	238	252
Interest cost	177	178	172
Expected return on plan assets	(426)	(431)	(393)
Amortization of unrecognized prior service cost	(12)	(13)	(11)
Net loss amortization	64	84	98
Termination benefits	8	2	4
Curtailments	6	1	(4)
Settlements	1	13	5
Net periodic benefit cost (credit)	$ 56	$ 72	$ 123

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Contingencies and Environmental Liabilities - Legal Defense Reserves - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Legal Defense Costs
Loss Contingencies [Line Items]
Legal defense costs reserve	$ 240	$ 245

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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	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	$ 288	$ 454
Fair Value of Derivative, Liability	97	160
U.S. Dollar Notional	30,666	29,742
Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	222	338
Fair Value of Derivative, Liability	24	89
U.S. Dollar Notional	14,728	14,390
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	66	116
Fair Value of Derivative, Liability	73	71
U.S. Dollar Notional	15,938	15,352
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other Assets
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	15	0
U.S. Dollar Notional	3,400	0
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Accrued and other current liabilities
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Liability	1	0
U.S. Dollar Notional	1,250	0
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Liability	0	81
U.S. Dollar Notional	0	4,650
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other Assets
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	55	75
Fair Value of Derivative, Liability	0	0
U.S. Dollar Notional	2,160	2,655
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other current assets
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	152	263
U.S. Dollar Notional	6,117	6,222
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Accrued and other current liabilities
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Liability	22	7
U.S. Dollar Notional	1,748	774
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	53	89
Foreign exchange contracts | Derivatives Not Designated as Hedging Instruments | Other current assets
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Asset	66	116
U.S. Dollar Notional	7,245	5,430
Foreign exchange contracts | Derivatives Not Designated as Hedging Instruments | Accrued and other current liabilities
Derivatives, Fair Value [Line Items]
Fair Value of Derivative, Liability	73	71
U.S. Dollar Notional	$ 8,693	$ 9,922

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Financial Instruments - Narrative (Details)	3 Months Ended		12 Months Ended
	Dec. 31, 2019 USD ($) interest_rate_swap	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) interest_rate_swap	Dec. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)
Derivative [Line Items]
Number of interest rate swaps held | interest_rate_swap	19		19
Notional amount of derivative	$ 30,666,000,000	$ 29,742,000,000	$ 30,666,000,000	$ 29,742,000,000
Face amount of debt					$ 5,000,000,000.0
Pre tax net unrealized gain (loss) on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales			31,000,000
Equity investments without readily determinable fair values	420,000,000	568,000,000	420,000,000	568,000,000
Unrealized gains based on favorable observable price changes			20,000,000	167,000,000
Unrealized loss related to unfavorable observable price changes			13,000,000	26,000,000
Upward price adjustment	109,000,000		109,000,000
Downward price adjustment	21,000,000		21,000,000
Available-for-sale debt securities included in Short-term investments	749,000,000		749,000,000
Available-for-sale debt securities maturing within five years	933,000,000		933,000,000
Cash and cash equivalents	9,676,000,000	7,965,000,000	9,676,000,000	7,965,000,000
Payments of contingent consideration			85,000,000	244,000,000
Fair value of loans payable and long-term debt, including current portion	28,800,000,000	25,600,000,000	28,800,000,000	25,600,000,000
Long term and short term debt	26,300,000,000	25,100,000,000	26,300,000,000	25,100,000,000
Accounts receivable factored	2,700,000,000	1,100,000,000
Funds collected from factoring of receivable, held in restricted cash	256,000,000		256,000,000
Cash collateral received from counterparties	34,000,000	107,000,000	34,000,000	107,000,000
Right to reclaim cash	0	0	$ 0	0
Customer Concentration Risk | Accounts Receivable | McKesson Corporation, AmerisourceBergen Corporation and Cardinal Health, Inc.
Derivative [Line Items]
Percentage of accounts receivable represented by customers with largest balances (as percent)			35.00%
Afferent Pharmaceuticals
Derivative [Line Items]
Payments of contingent consideration				175,000,000
Level 2
Derivative [Line Items]
Cash and cash equivalents	9,700,000,000		$ 9,700,000,000
Cash equivalents	8,900,000,000		8,900,000,000
Derivatives Designated as Hedging Instruments
Derivative [Line Items]
Notional amount of derivative	14,728,000,000	14,390,000,000	14,728,000,000	14,390,000,000
Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Notional amount of derivative	$ 15,938,000,000	$ 15,352,000,000	$ 15,938,000,000	$ 15,352,000,000
Maximum | Derivatives Designated as Hedging Instruments
Derivative [Line Items]
Maximum planning cycle of hedges (no more than)			2 years
Maximum | Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Maximum planning cycle of hedges (no more than)			1 year

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Collaborative Arrangements - Schedule of Collaborative Arrangement Transactions (Details) - Collaborative Arrangement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AstraZeneca | Other current assets
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Receivables from counterparty	$ 128	$ 52
AstraZeneca | Accrued and other current liabilities
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payables to counterparty	577	405
AstraZeneca | Other Noncurrent Liabilities
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payables to counterparty	0	250
AstraZeneca | Total sales
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total sales	444	187	$ 20
AstraZeneca | Cost of sales
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expenses	148	93	4
AstraZeneca | Selling, general and administrative
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expenses	138	48	1
AstraZeneca | Research and development
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expenses	168	152	2,419
Eisai | Other current assets
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Receivables from counterparty	150	71
Eisai | Accrued and other current liabilities
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payables to counterparty	700	375
Eisai | Other Noncurrent Liabilities
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payables to counterparty	525	543
Eisai | Total sales
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total sales	404	149
Eisai | Cost of sales
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expenses	206	39
Eisai | Selling, general and administrative
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expenses	80	13
Eisai | Research and development
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expenses	189	1,489
Bayer AG | Other current assets
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Receivables from counterparty	49	32
Bayer AG | Other Noncurrent Liabilities
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payables to counterparty	375	375
Bayer AG | Total sales
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Net product sales recorded by Merck	215	190	149
Merck’s profit share of sales in marketing territories	204	139	151
Total sales	419	329	300
Bayer AG | Cost of sales
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expenses	113	216	99
Bayer AG | Selling, general and administrative
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expenses	41	35	27
Bayer AG | Research and development
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expenses	$ 126	$ 127	$ 101

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Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities
Net income	$ 9,777	$ 6,193	$ 2,418
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,652	4,519	4,676
Intangible asset impairment charges	1,040	296	646
Charge for the acquisition of Peloton Therapeutics, Inc.	993	0	0
Charge for future payments related to collaboration license options	0	650	500
Provisional charge for one-time transition tax related to the enactment of U.S. tax legislation	0	0	5,347
Deferred income taxes	(556)	(509)	(2,621)
Share-based compensation	417	348	312
Other	184	978	190
Net changes in assets and liabilities:
Accounts receivable	294	(418)	297
Inventories	(508)	(911)	(145)
Trade accounts payable	399	230	254
Accrued and other current liabilities	376	(341)	(922)
Income taxes payable	(2,359)	827	(3,291)
Noncurrent liabilities	(237)	(266)	(123)
Other	(32)	(674)	(1,087)
Net Cash Provided by Operating Activities	13,440	10,922	6,451
Cash Flows from Investing Activities
Capital expenditures	(3,473)	(2,615)	(1,888)
Purchases of securities and other investments	(3,202)	(7,994)	(10,739)
Proceeds from sales of securities and other investments	8,622	15,252	15,664
Acquisition of Antelliq Corporation, net of cash acquired	(3,620)	0	0
Acquisition of Peloton Therapeutics, Inc., net of cash acquired	(1,040)	0	0
Other acquisitions, net of cash acquired	(294)	(431)	(396)
Other	378	102	38
Net Cash (Used in) Provided by Investing Activities	(2,629)	4,314	2,679
Cash Flows from Financing Activities
Net change in short-term borrowings	(3,710)	5,124	(26)
Payments on debt	0	(4,287)	(1,103)
Proceeds from issuance of debt	4,958	0	0
Purchases of treasury stock	(4,780)	(9,091)	(4,014)
Dividends paid to stockholders	(5,695)	(5,172)	(5,167)
Proceeds from exercise of stock options	361	591	499
Other	5	(325)	(195)
Net Cash Used in Financing Activities	(8,861)	(13,160)	(10,006)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	17	(205)	457
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	1,967	1,871	(419)
Cash, Cash Equivalents and Restricted Cash at Beginning of Year (includes $2 million of restricted cash at January 1, 2019 included in Other Assets)	7,967	6,096	6,515
Cash, Cash Equivalents and Restricted Cash at End of Year (includes $258 million of restricted cash at December 31, 2019 included in Other Assets - see Note 6)	$ 9,934	$ 7,967	$ 6,096

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Restructuring (Tables)

12 Months Ended

Dec. 31, 2019

Restructuring and Related Activities [Abstract]

Charges Related to Restructuring Program Activities by Type of Cost

The following table summarizes the charges related to restructuring program activities by type of cost:

	Separation Costs		Accelerated Depreciation			Other		Total
Year Ended December 31, 2019
Cost of sales	$	—	$	198		$	53	$	251
Selling, general and administrative	—		33			1		34
Research and development	—		2			2		4
Restructuring costs	572		—			66		638
	$	572	$	233		$	122	$	927
Year Ended December 31, 2018
Cost of sales	$	—	$	10		$	11	$	21
Selling, general and administrative	—		2			1		3
Research and development	—		(13		)	15		2
Restructuring costs	473		—			159		632
	$	473	$	(1	)	$	186	$	658
Year Ended December 31, 2017
Cost of sales	$	—	$	52		$	86	$	138
Selling, general and administrative	—		2			—		2
Research and development	—		6			5		11
Restructuring costs	552		—			224		776
	$	552	$	60		$	315	$	927

Charges and Spending Relating to Restructuring Activities by Program

The following table summarizes the charges and spending relating to restructuring program activities:

	Separation Costs			Accelerated Depreciation			Other			Total
Restructuring reserves January 1, 2018	$	619		$	—		$	128		$	747
Expenses	473			(1		)	186			658
(Payments) receipts, net	(649		)	—			(238		)	(887		)
Non-cash activity	—			1			15			16
Restructuring reserves December 31, 2018	443			—			91			534
Expenses	572			233			122			927
(Payments) receipts, net	(325		)	—			(136		)	(461		)
Non-cash activity	—			(233		)	(8		)	(241		)
Restructuring reserves December 31, 2019 (1)	$	690		$	—		$	69		$	759

⁽¹⁾ 

The remaining cash outlays are expected to be substantially completed by the end of 2023.

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Segment Reporting - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 segment
Segment Reporting [Abstract]
Number of operating segments	4

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Loans Payable, Long-Term Debt and Leases (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Long-term debt at December 31 consisted of:

	2019		2018
2.75% notes due 2025	$	2,492	$	2,490
3.70% notes due 2045	1,975		1,974
2.80% notes due 2023	1,747		1,745
3.40% notes due 2029	1,732		—
4.00% notes due 2049	1,468		—
2.35% notes due 2022	1,248		1,214
4.15% notes due 2043	1,238		1,237
3.875% notes due 2021	1,151		1,132
1.125% euro-denominated notes due 2021	1,113		1,134
1.875% euro-denominated notes due 2026	1,107		1,127
2.40% notes due 2022	1,010		983
3.90% notes due 2039	982		—
2.90% notes due 2024	745		—
6.50% notes due 2033	722		726
0.50% euro-denominated notes due 2024	555		565
1.375% euro-denominated notes due 2036	551		561
2.50% euro-denominated notes due 2034	550		560
3.60% notes due 2042	490		490
6.55% notes due 2037	412		414
5.75% notes due 2036	338		338
5.95% debentures due 2028	306		306
5.85% notes due 2039	271		270
6.40% debentures due 2028	250		250
6.30% debentures due 2026	135		135
1.85% notes due 2020	—		1,231
Floating-rate notes due 2020	—		699
Other	148		225
	$	22,736	$	19,806

Supplemental Balance Sheet Information

Supplemental balance sheet information related to operating leases is as follows:

December 31	2019
Assets
Other Assets (1)	$	1,073
Liabilities
Accrued and other current liabilities	236
Other Noncurrent Liabilities	768
	$	1,004
Weighted-average remaining lease term (years)	7.4
Weighted-average discount rate	3.2		%

⁽¹⁾ Includes prepaid leases that have no related lease liability.

Schedule of Maturities of Operating Lease Liabilities

Maturities of operating leases liabilities are as follows:

2020	$	264
2021	200
2022	168
2023	113
2024	89
Thereafter	297
Total lease payments	1,131
Less: Imputed interest	127
	$	1,004

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Taxes on Income - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Unrecognized tax benefits, reduction resulting from divestiture of Merck's consumer care business	$ (103)	$ (29)	$ (11)
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance January 1	1,893	1,723	3,494
Additions related to current year positions	199	221	146
Additions related to prior year positions	46	142	520
Reductions for tax positions of prior years	(454)	(73)	(1,038)
Settlements	(356)	(91)	(1,388)
Lapse of statute of limitations (2)	(103)	(29)	(11)
Balance December 31	1,225	$ 1,893	$ 1,723
consumer care business
Income Tax Contingency [Line Items]
Unrecognized tax benefits, reduction resulting from divestiture of Merck's consumer care business	(78)
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Lapse of statute of limitations (2)	$ (78)

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Consolidated Balance Sheet - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 9,676	$ 7,965
Short-term investments	774	899
Accounts receivable (net of allowance for doubtful accounts of $86 in 2019 and $119 in 2018)	6,778	7,071
Inventories (excludes inventories of $1,480 in 2019 and $1,417 in 2018 classified in Other assets - see Note 7)	5,978	5,440
Other current assets	4,277	4,500
Total current assets	27,483	25,875
Investments	1,469	6,233
Property, Plant and Equipment (at cost)
Land	343	333
Buildings	11,989	11,486
Machinery, equipment and office furnishings	15,394	14,441
Construction in progress	5,013	3,355
Property, plant and equipment (at cost)	32,739	29,615
Less: accumulated depreciation	17,686	16,324
Property, plant and equipment, net	15,053	13,291
Goodwill	19,425	18,253
Other Intangibles, Net	14,196	13,104
Other Assets	6,771	5,881
Total Assets	84,397	82,637
Current Liabilities
Loans payable and current portion of long-term debt	3,610	5,308
Trade accounts payable	3,738	3,318
Accrued and other current liabilities	12,549	10,151
Income taxes payable	736	1,971
Dividends payable	1,587	1,458
Total current liabilities	22,220	22,206
Long-Term Debt	22,736	19,806
Deferred Income Taxes	1,470	1,702
Other Noncurrent Liabilities	11,970	12,041
Merck & Co., Inc. Stockholders’ Equity
Common stock, $0.50 par value Authorized - 6,500,000,000 shares Issued - 3,577,103,522 shares in 2019 and 2018	1,788	1,788
Other paid-in capital	39,660	38,808
Retained earnings	46,602	42,579
Accumulated other comprehensive loss	(6,193)	(5,545)
Stockholders' equity before deduction for treasury stock	81,857	77,630
Less treasury stock, at cost: 1,038,087,496 shares in 2019 and 984,543,979 shares in 2018	55,950	50,929
Total Merck & Co., Inc. stockholders’ equity	25,907	26,701
Noncontrolling Interests	94	181
Total equity	26,001	26,882
Total Liabilities and Equity	$ 84,397	$ 82,637

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Other (Income) Expense, Net (Tables)

12 Months Ended

Dec. 31, 2019

Other Income and Expenses [Abstract]

Other (Income) Expense, Net

Other (income) expense, net, consisted of:

Years Ended December 31	2019			2018			2017
Interest income	$	(274	)	$	(343	)	$	(385	)
Interest expense	893			772			754
Exchange losses (gains)	187			145			(11		)
Income from investments in equity securities, net (1)	(170		)	(324		)	(352		)
Net periodic defined benefit plan (credit) cost other than service cost	(545		)	(512		)	(512		)
Other, net	48			(140		)	6
	$	139		$	(402	)	$	(500	)

⁽¹⁾ Includes net realized and unrealized gains and losses from investments in equity securities either owned directly or through ownership interests in investment funds.

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Taxes on Income - Reconciliation Between Effective Tax Rate and US Statutory Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amount
U.S. statutory rate applied to income before taxes	$ 2,408	$ 1,827	$ 2,282
Differential arising from:
Foreign earnings	(1,020)	(245)	(1,654)
GILTI and the foreign-derived intangible income deduction	336	(25)	0
Tax settlements	(403)	(22)	(356)
R&D tax credit	(118)	(96)	(71)
State taxes	(2)	201	77
Acquisition of Peloton	209	0	0
TCJA	117	289	2,625
Valuation allowances	113	269	632
Acquisition-related costs, including amortization	95	267	713
Restructuring	39	56	142
Other	(87)	(13)	(287)
Taxes on income	$ 1,687	$ 2,508	$ 4,103
Tax Rate
U.S. statutory rate applied to income before taxes	21.00%	21.00%	35.00%
Differential arising from:
Foreign earnings	(8.90%)	(2.80%)	(25.40%)
GILTI and the foreign-derived intangible income deduction	2.90%	(0.30%)	0.00%
Tax settlements	(3.50%)	(0.30%)	(5.50%)
R&D tax credit	(1.00%)	(1.10%)	(1.10%)
State taxes	0.00%	2.30%	1.20%
Acquisition of Peloton	1.80%	0.00%	0.00%
TCJA	0.010	0.033	0.403
Valuation allowances	1.00%	3.10%	9.70%
Acquisition-related costs, including amortization	0.80%	3.10%	10.90%
Restructuring	0.30%	0.60%	2.20%
Other	(0.70%)	(0.10%)	(4.40%)
Total, Tax Rate	14.70%	28.80%	62.90%

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Inventories

12 Months Ended

Dec. 31, 2019

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories at December 31 consisted of:

	2019			2018
Finished goods	$	1,772		$	1,658
Raw materials and work in process	5,650			5,004
Supplies	207			194
Total (approximates current cost)	7,629			6,856
(Decrease) increase to LIFO cost	(171		)	1
	$	7,458		$	6,857
Recognized as:
Inventories	$	5,978		$	5,440
Other assets	1,480			1,417

Inventories valued under the LIFO method comprised approximately $2.6 billion and $2.5 billion at December 31, 2019 and 2018, respectively. Amounts recognized as Other assets are comprised almost entirely of raw materials and work in process inventories. At December 31, 2019 and 2018, these amounts included $1.3 billion and $1.4 billion, respectively, of inventories not expected to be sold within one year. In addition, these amounts included $168 million and $7 million at December 31, 2019 and 2018, respectively, of inventories produced in preparation for product launches.

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Acquisitions, Divestitures, Research Collaborations and License Agreements

12 Months Ended

Dec. 31, 2019

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 arrangements, 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.

Recently Completed Transaction

In January 2020, Merck acquired ArQule, Inc. (ArQule), a publicly traded biopharmaceutical company focused on kinase inhibitor discovery and development for the treatment of patients with cancer and other diseases for $2.7 billion. ArQule’s lead investigational candidate, MK-1026 (formerly ARQ 531), is a novel, oral Bruton’s tyrosine kinase (BTK) inhibitor currently in a Phase 2 dose expansion study for the treatment of B-cell malignancies. The Company is in the process of determining the preliminary fair value of assets acquired, liabilities assumed and total consideration transferred in this transaction, which will be accounted for as an acquisition of a business.

2019 Transactions

In July 2019, Merck acquired Peloton Therapeutics, Inc. (Peloton), a clinical-stage biopharmaceutical company focused on the development of novel small molecule therapeutic candidates targeting hypoxia-inducible factor-2α (HIF-2α) for the treatment of patients with cancer and other non-oncology diseases. Peloton’s lead candidate, MK-6482 (formerly PT2977), is a novel oral HIF-2α inhibitor in late-stage development for renal cell carcinoma. Merck made an upfront payment of $1.2 billion in cash; additionally, former Peloton shareholders will be eligible to receive $50 million upon U.S. regulatory approval, $50 million upon first commercial sale in the United States, and up to $1.05 billion of sales-based milestones. The transaction was accounted for as an acquisition of an asset. Merck recorded cash of $157 million, deferred tax liabilities of $52 million, and other net liabilities of $4 million at the acquisition date and Research and development expenses of $993 million in 2019 related to the transaction.

On April 1, 2019, Merck acquired Antelliq Corporation (Antelliq), a leader in digital animal identification, traceability and monitoring solutions. These solutions help veterinarians, farmers and pet owners gather critical data to improve management, health and well-being of livestock and pets. Merck paid $2.3 billion to acquire all outstanding shares of Antelliq and spent $1.3 billion to repay Antelliq’s debt. The transaction was accounted for as an acquisition of a business.

The estimated fair value of assets acquired and liabilities assumed from Antelliq is as follows:

($ in millions)	April 1, 2019
Cash and cash equivalents	$	31
Accounts receivable	73
Inventories	95
Property, plant and equipment	62
Identifiable intangible assets (useful lives ranging from 18-24 years) (1)	2,689
Deferred income tax liabilities	(520		)
Other assets and liabilities, net	(81		)
Total identifiable net assets	2,349
Goodwill (2)	1,302
Consideration transferred	$	3,651

⁽¹⁾  The estimated fair values of identifiable intangible assets relate primarily to trade names and were determined using an income approach. The future net cash flows were discounted to present value utilizing a discount rate of 11.5%. Actual cash flows are likely to be different than those assumed.

⁽²⁾  The goodwill recognized is largely attributable to anticipated synergies expected to arise after the acquisition and was allocated to the Animal Health segment. The goodwill is not deductible for tax purposes.

The Company’s results for 2019 include eight months of activity for Antelliq. The Company incurred $47 million of transaction costs directly related to the acquisition of Antelliq, consisting largely of advisory fees, which are reflected in Selling, general and administrative expenses in 2019.

Also in April 2019, Merck acquired Immune Design, a late-stage immunotherapy company employing next-generation in vivo approaches to enable the body’s immune system to fight disease, for $301 million in cash. The transaction was accounted for as an acquisition of a business. Merck recognized intangible assets for IPR&D of $156 million, cash of $83 million and other net assets of $42 million. The excess of the consideration transferred over the fair value of net assets acquired of $20 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. Actual cash flows are likely to be different than those assumed.

2018 Transactions

In 2018, the Company recorded an aggregate charge of $423 million within Cost of sales in conjunction with the termination of a collaboration agreement entered into in 2014 with Samsung Bioepis Co., Ltd. (Samsung) for insulin glargine. The charge reflects a termination payment of $155 million, which represents the reimbursement of all fees previously paid by Samsung to Merck under the agreement, plus interest, as well as the release of Merck’s ongoing obligations under the agreement. The charge also included fixed asset abandonment charges of $137 million, inventory write-offs of $122 million, as well as other related costs of $9 million. The termination of this agreement has no impact on the Company’s other collaboration with Samsung.

In June 2018, Merck acquired Viralytics Limited (Viralytics), an Australian publicly traded company focused on oncolytic immunotherapy treatments for a range of cancers, for AUD 502 million ($378 million). The transaction provided Merck with full rights to V937 (formerly CVA21), Viralytics’s investigational oncolytic immunotherapy. V937 is based on Viralytics’s proprietary formulation of an oncolytic virus (Coxsackievirus Type A21) that has been shown to preferentially infect and kill cancer cells. V937 is currently being evaluated in multiple clinical trials, both as an intratumoral and intravenous agent, including in combination with Keytruda. Under a previous agreement between Merck and Viralytics, a study is investigating the use of the Keytruda and V937 combination in melanoma, prostate, lung and bladder cancers. The transaction was accounted for as an acquisition of an asset. Merck recorded net assets of $34 million (primarily cash) at the acquisition date and Research and development expenses of $344 million in 2018 related to the transaction. There are no future contingent payments associated with the acquisition.

In March 2018, Merck and Eisai Co., Ltd. (Eisai) entered into a strategic collaboration for the worldwide co-development and co-commercialization of Lenvima, an orally available tyrosine kinase inhibitor discovered by Eisai (see Note 4).

2017 Transactions

In October 2017, Merck acquired Rigontec GmbH (Rigontec), a leader in accessing the retinoic acid-inducible gene I pathway, part of the innate immune system, as a novel and distinct approach in cancer immunotherapy to induce both immediate and long-term anti-tumor immunity. Rigontec’s lead candidate, MK-4621 (formerly RGT100), is in development for the treatment in patients with various tumors. Under the terms of the agreement, Merck made an upfront cash payment of €119 million ($140 million) and may make additional contingent payments of up to €349 million (of which €184 million are related to the achievement of research milestones and regulatory approvals and €165 million are related to the achievement of commercial targets). The transaction was accounted for as an acquisition of an asset and the upfront payment is reflected within Research and development expenses in 2017.

In July 2017, Merck and AstraZeneca PLC (AstraZeneca) entered into a global strategic oncology collaboration to co-develop and co-commercialize AstraZeneca’s Lynparza for multiple cancer types (see Note 4).

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 $102 million, other net assets of $32 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 $156 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. 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 the fourth quarter of 2017, Merck acquired an additional 4.5% interest in Vallée for $18 million, which reduced the noncontrolling interest related to Vallée.

Remicade/Simponi

In 1998, a subsidiary of Schering-Plough entered into a licensing agreement with Centocor Ortho Biotech Inc. (Centocor), a Johnson & Johnson (J&J) company, to market Remicade, which is prescribed for the treatment of inflammatory diseases. In 2005, Schering-Plough’s subsidiary exercised an option under its contract with Centocor for license rights to develop and commercialize Simponi, a fully human monoclonal antibody. The Company has marketing rights to both products throughout Europe, Russia and Turkey. Remicade lost market exclusivity in major European markets in 2015 and the Company no longer has market exclusivity in any of its marketing territories. The Company continues to have market exclusivity for Simponi in all of its marketing territories. All profits derived from Merck’s distribution of the two products in these countries are equally divided between Merck and J&J.

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Segment Reporting - Property, Plant and Equipment, Net by Geographic Area (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 15,053	$ 13,291	$ 12,439
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	8,974	8,306	8,070
Europe, Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	4,767	3,706	3,151
Asia Pacific (other than Japan and China)
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	714	684	632
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	266	264	271
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	174	167	150
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	152	159	158
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 6	$ 5	$ 7

XML

Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Other Comprehensive Income (Loss)

Other Comprehensive Income (Loss)

Changes in AOCI by component are as follows:

	Derivatives				Investments				Employee Benefit Plans				Cumulative Translation Adjustment			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2017, net of taxes	$	338			$	(3	)		$	(3,206	)		$	(2,355	)	$	(5,226	)
Other comprehensive income (loss) before reclassification adjustments, pretax	(561		)		212				438				235			324
Tax	207				(35		)		(106		)		166			232
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(354		)		177				332				401			556
Reclassification adjustments, pretax	(141		)	(1)	(291		)	(2)	117			(3)	—			(315		)
Tax	49				56				(30		)		—			75
Reclassification adjustments, net of taxes	(92		)		(235		)		87				—			(240		)
Other comprehensive income (loss), net of taxes	(446		)		(58		)		419				401			316
Balance at December 31, 2017, net of taxes	(108		)		(61		)		(2,787		)		(1,954		)	(4,910		)
Other comprehensive income (loss) before reclassification adjustments, pretax	228				(108		)		(728		)		(84		)	(692		)
Tax	(55		)		1				169				(139		)	(24		)
Other comprehensive income (loss) before reclassification adjustments, net of taxes	173				(107		)		(559		)		(223		)	(716		)
Reclassification adjustments, pretax	157			(1)	97			(2)	170			(3)	—			424
Tax	(33		)		—				(36		)		—			(69		)
Reclassification adjustments, net of taxes	124				97				134				—			355
Other comprehensive income (loss), net of taxes	297				(10		)		(425		)		(223		)	(361		)
Adoption of ASU 2018-02	(23		)		1				(344		)		100			(266		)
Adoption of ASU 2016-01	—				(8		)		—				—			(8		)
Balance at December 31, 2018, net of taxes	166				(78		)		(3,556		)	(4)	(2,077		)	(5,545		)
Other comprehensive income (loss) before reclassification adjustments, pretax	86				140				(948		)		112			(610		)
Tax	(15		)		—				192				(16		)	161
Other comprehensive income (loss) before reclassification adjustments, net of taxes	71				140				(756		)		96			(449		)
Reclassification adjustments, pretax	(261		)	(1)	(44		)	(2)	66			(3)	—			(239		)
Tax	55				—				(15		)		—			40
Reclassification adjustments, net of taxes	(206		)		(44		)		51				—			(199		)
Other comprehensive income (loss), net of taxes	(135		)		96				(705		)		96			(648		)
Balance at December 31, 2019, net of taxes	$	31			$	18			$	(4,261	)	(4)	$	(1,981	)	$	(6,193	)

⁽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. In 2017, these amounts included both investments in debt and equity securities; however, as a result of the adoption of ASU 2016-01 in 2018, these amounts relate only to investments in available-for-sale debt securities.

⁽³⁾  Includes net amortization of prior service cost and actuarial gains and losses included in net periodic benefit cost (see Note 13).

⁽⁴⁾ 

Includes pension plan net loss of $5.1 billion and $4.4 billion at December 31, 2019 and 2018, respectively, and other postretirement benefit plan net gain of $247 million and $170 million at December 31, 2019 and 2018, respectively, as well as pension plan prior service credit of $263 million and $314 million at December 31, 2019 and 2018, respectively, and other postretirement benefit plan prior service credit of $305 million and $375 million at December 31, 2019 and 2018, respectively.

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Pension and Other Postretirement Benefit Plans

12 Months Ended

Dec. 31, 2019

Retirement Benefits [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. In addition, the Company provides medical benefits, principally to its eligible U.S. retirees and their dependents, through its other postretirement benefit plans. The Company uses December 31 as the year-end measurement date for all of its pension plans and other postretirement benefit plans.

Net Periodic Benefit Cost

The net periodic benefit cost (credit) for pension and other postretirement benefit plans consisted of the following components:

	Pension Benefits
	U.S.									International									Other Postretirement Benefits
Years Ended December 31	2019			2018			2017			2019			2018			2017			2019			2018			2017
Service cost	$	293		$	326		$	312		$	238		$	238		$	252		$	48		$	57		$	57
Interest cost	458			432			454			177			178			172			69			69			81
Expected return on plan assets	(817		)	(851		)	(862		)	(426		)	(431		)	(393		)	(72		)	(83		)	(78		)
Amortization of unrecognized prior service cost	(49		)	(50		)	(53		)	(12		)	(13		)	(11		)	(78		)	(84		)	(98		)
Net loss amortization	151			232			180			64			84			98			(10		)	1			1
Termination benefits	31			19			44			8			2			4			5			3			8
Curtailments	14			10			3			6			1			(4		)	(11		)	(8		)	(31		)
Settlements	—			5			—			1			13			5			—			—			—
Net periodic benefit cost (credit)	$	81		$	123		$	78		$	56		$	72		$	123		$	(49	)	$	(45	)	$	(60	)

The changes in net periodic benefit cost (credit) year over year for pension plans are largely attributable to changes in the discount rate affecting net loss amortization.

In connection with restructuring actions (see Note 5), termination charges were recorded in 2019, 2018 and 2017 on pension and other postretirement benefit plans related to expanded eligibility for certain employees exiting Merck. Also, in connection with these restructuring activities, curtailments were recorded on pension and other postretirement benefit plans and settlements were recorded on certain U.S. and international pension plans as reflected in the table above.

The components of net periodic benefit cost (credit) other than the service cost component are included in Other (income) expense, net (see Note 14), with the exception of certain amounts for termination benefits, curtailments and settlements, which are recorded in Restructuring costs if the event giving rise to the termination benefits, curtailment or settlement is related to restructuring actions as noted above.

Obligations and Funded Status

Summarized information about the changes in plan assets and benefit obligations, the funded status and the amounts recorded at December 31 is as follows:

	Pension Benefits												Other Postretirement Benefits
	U.S.						International
	2019			2018			2019			2018			2019			2018
Fair value of plan assets January 1	$	9,648		$	10,896		$	8,580		$	9,339		$	968		$	1,114
Actual return on plan assets	2,165			(810		)	1,505			(289		)	203			(72		)
Company contributions	130			378			262			167			14			6
Effects of exchange rate changes	—			—			31			(352		)	—			—
Benefits paid	(582		)	(772		)	(230		)	(202		)	(104		)	(80		)
Settlements	—			(44		)	(12		)	(106		)	—			—
Other	—			—			27			23			21			—
Fair value of plan assets December 31	$	11,361		$	9,648		$	10,163		$	8,580		$	1,102		$	968
Benefit obligation January 1	$	10,620		$	11,904		$	9,083		$	9,483		$	1,615		$	1,922
Service cost	293			326			238			238			48			57
Interest cost	458			432			177			178			69			69
Actuarial losses (gains) (1)	2,165			(1,258		)	1,313			(154		)	21			(341		)
Benefits paid	(582		)	(772		)	(230		)	(202		)	(104		)	(80		)
Effects of exchange rate changes	—			—			4			(387		)	1			(6		)
Plan amendments	—			—			1			10			—			(9		)
Curtailments	18			13			3			(2		)	—			—
Termination benefits	31			19			8			2			5			3
Settlements	—			(44		)	(12		)	(106		)	—			—
Other	—			—			27			23			18			—
Benefit obligation December 31	$	13,003		$	10,620		$	10,612		$	9,083		$	1,673		$	1,615
Funded status December 31	$	(1,642	)	$	(972	)	$	(449	)	$	(503	)	$	(571	)	$	(647	)
Recognized as:
Other Assets	$	—		$	—		$	837		$	659		$	—		$	—
Accrued and other current liabilities	(92		)	(47		)	(18		)	(14		)	(10		)	(10		)
Other Noncurrent Liabilities	(1,550		)	(925		)	(1,268		)	(1,148		)	(561		)	(637		)

⁽¹⁾ Actuarial losses (gains) primarily reflect changes in discount rates.

At December 31, 2019 and 2018, the accumulated benefit obligation was $22.8 billion and $19.0 billion, respectively, for all pension plans, of which $12.8 billion and $10.4 billion, respectively, related to U.S. pension plans.

Information related to the funded status of selected pension plans at December 31 is as follows:

	U.S.				International
	2019		2018		2019		2018
Pension plans with a projected benefit obligation in excess of plan assets
Projected benefit obligation	$	13,003	$	10,620	$	7,421	$	6,251
Fair value of plan assets	11,361		9,648		6,135		5,089
Pension plans with an accumulated benefit obligation in excess of plan assets
Accumulated benefit obligation	$	12,009	$	9,702	$	2,476	$	5,936
Fair value of plan assets	10,484		8,966		1,501		5,071

Plan Assets

Entities are required to use 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. The Level 3 assets are those whose values are determined using pricing models, discounted cash flow methodologies, or similar techniques with significant unobservable inputs, as well as instruments for which the determination of fair value requires significant judgment or estimation. At December 31, 2019 and 2018, $860 million and $826 million, respectively, or approximately 4% and 5%, respectively, of the Company’s pension investments were categorized as Level 3 assets.

If the inputs used to measure the financial assets 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.

The fair values of the Company’s pension plan assets at December 31 by asset category are as follows:

	Fair Value Measurements Using										Fair Value Measurements Using
	Level 1		Level 2		Level 3		NAV (1)		Total		Level 1		Level 2		Level 3		NAV (1)		Total
	2019										2018
U.S. Pension Plans
Assets
Cash and cash equivalents	$	3	$	—	$	—	$	236	$	239	$	40	$	—	$	—	$	182	$	222
Investment funds
Developed markets equities	205		—		—		3,542		3,747		169		—		—		3,021		3,190
Emerging markets equities	165		—		—		723		888		121		—		—		720		841
Government and agency obligations	—		—		—		173		173		—		—		—		161		161
Corporate obligations	—		—		—		—		—		—		—		—		32		32
Equity securities
Developed markets	2,451		—		—		—		2,451		2,172		—		—		—		2,172
Fixed income securities																			—
Government and agency obligations	—		2,094		—		—		2,094		—		1,509		—		—		1,509
Corporate obligations	—		1,582		—		—		1,582		—		1,246		—		—		1,246
Mortgage and asset-backed securities	—		178		—		—		178		—		262		—		—		262
Other investments	—		—		9		—		9		—		—		13		—		13
Plan assets at fair value	$	2,824	$	3,854	$	9	$	4,674	$	11,361	$	2,502	$	3,017	$	13	$	4,116	$	9,648
International Pension Plans
Assets
Cash and cash equivalents	$	70	$	1	$	—	$	15	$	86	$	50	$	3	$	—	$	16	$	69
Investment funds
Developed markets equities	546		3,761		—		96		4,403		461		3,071		—		75		3,607
Government and agency obligations	462		2,534		—		207		3,203		372		2,082		—		180		2,634
Emerging markets equities	66		96		—		90		252		56		112		—		83		251
Corporate obligations	5		11		—		109		125		4		7		—		94		105
Fixed income obligations	9		6		—		—		15		7		4		—		—		11
Real estate	—		1		—		—		1		—		1		1		—		2
Equity securities
Developed markets	565		—		—		—		565		544		—		—		—		544
Fixed income securities
Government and agency obligations	3		376		—		—		379		2		291		—		—		293
Corporate obligations	1		135		—		—		136		1		113		—		—		114
Mortgage and asset-backed securities	—		61		—		—		61		—		55		—		—		55
Other investments
Insurance contracts (2)	—		65		851		—		916		—		66		811		—		877
Other	—		5		—		16		21		—		4		1		13		18
Plan assets at fair value	$	1,727	$	7,052	$	851	$	533	$	10,163	$	1,497	$	5,809	$	813	$	461	$	8,580

⁽¹⁾  Certain investments that were measured at net asset value (NAV) per share or its equivalent have not been classified in the fair value hierarchy. The NAV amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets at December 31, 2019 and 2018.

⁽²⁾  The plans’ Level 3 investments in insurance contracts are generally valued using a crediting rate that approximates market returns and invest in underlying securities whose market values are unobservable and determined using pricing models, discounted cash flow methodologies, or similar techniques.

The table below provides a summary of the changes in fair value, including transfers in and/or out, of all financial assets measured at fair value using significant unobservable inputs (Level 3) for the Company’s pension plan assets:

	2019												2018
	Insurance Contracts			Real Estate			Other			Total			Insurance Contracts			Real Estate			Other			Total
U.S. Pension Plans
Balance January 1	$	—		$	—		$	13		$	13		$	—		$	—		$	15		$	15
Actual return on plan assets:
Relating to assets still held at December 31	—			—			(8		)	(8		)	—			—			(3		)	(3		)
Relating to assets sold during the year	—			—			8			8			—			—			4			4
Purchases and sales, net	—			—			(4		)	(4		)	—			—			(3		)	(3		)
Balance December 31	$	—		$	—		$	9		$	9		$	—		$	—		$	13		$	13
International Pension Plans
Balance January 1	$	811		$	1		$	1		$	813		$	470		$	2		$	1		$	473
Actual return on plan assets:
Relating to assets still held at December 31	54			—			—			54			(32		)	—			—			(32		)
Purchases and sales, net	(14		)	(1		)	(1		)	(16		)	380			(1		)	—			379
Transfers out of Level 3	—			—			—			—			(7		)	—			—			(7		)
Balance December 31	$	851		$	—		$	—		$	851		$	811		$	1		$	1		$	813

The fair values of the Company’s other postretirement benefit plan assets at December 31 by asset category are as follows:

	Fair Value Measurements Using										Fair Value Measurements Using
	Level 1		Level 2		Level 3		NAV (1)		Total		Level 1		Level 2		Level 3		NAV (1)		Total
	2019										2018
Assets
Cash and cash equivalents	$	52	$	—	$	—	$	22	$	74	$	78	$	—	$	—	$	16	$	94
Investment funds
Developed markets equities	19		—		—		324		343		16		—		—		279		295
Emerging markets equities	15		—		—		66		81		12		—		—		67		79
Government and agency obligations	1		—		—		16		17		1		—		—		15		16
Corporate obligations	—		—		—		—		—		—		—		—		3		3
Equity securities																			—
Developed markets	225		—		—		—		225		200		—		—		—		200
Fixed income securities
Government and agency obligations	—		196		—		—		196		—		141		—		—		141
Corporate obligations	—		149		—		—		149		—		116		—		—		116
Mortgage and asset-backed securities	—		17		—		—		17		—		24		—		—		24
Plan assets at fair value	$	312	$	362	$	—	$	428	$	1,102	$	307	$	281	$	—	$	380	$	968

⁽¹⁾  Certain investments that were measured at net asset value (NAV) per share or its equivalent have not been classified in the fair value hierarchy. The NAV amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets at December 31, 2019 and 2018.

The Company has established investment guidelines for its U.S. pension and other postretirement plans to create an asset allocation that is expected to deliver a rate of return sufficient to meet the long-term obligation of each plan, given an acceptable level of risk. The target investment portfolio of the Company’s U.S. pension and other postretirement benefit plans is allocated 30% to 45% in U.S. equities, 15% to 30% in international equities, 35% to 45% in fixed-income investments, and up to 5% in cash and other investments. The portfolio’s equity weighting is consistent with the long-term nature of the plans’ benefit obligations. The expected annual standard deviation of returns

of the target portfolio, which approximates 10%, reflects both the equity allocation and the diversification benefits among the asset classes in which the portfolio invests. For international pension plans, the targeted investment portfolio varies based on the duration of pension liabilities and local government rules and regulations. Although a significant percentage of plan assets are invested in U.S. equities, concentration risk is mitigated through the use of strategies that are diversified within management guidelines.

Expected Contributions

Expected contributions during 2020 are approximately $100 million for U.S. pension plans, approximately $150 million for international pension plans and approximately $15 million for other postretirement benefit plans.

Expected Benefit Payments

Expected benefit payments are as follows:

	U.S. Pension Benefits		International Pension Benefits		Other Postretirement Benefits
2020	$	747	$	242	$	88
2021	717		225		92
2022	710		243		94
2023	718		250		98
2024	708		250		100
2025 — 2029	3,943		1,417		540

Expected benefit payments are based on the same assumptions used to measure the benefit obligations and include estimated future employee service.

Amounts Recognized in Other Comprehensive Income

Net loss amounts reflect experience differentials primarily relating to differences between expected and actual returns on plan assets as well as the effects of changes in actuarial assumptions. Net loss amounts in excess of certain thresholds are amortized into net periodic benefit cost over the average remaining service life of employees. The following amounts were reflected as components of OCI:

	Pension Plans																		Other Postretirement Benefit Plans
	U.S.									International
Years Ended December 31	2019			2018			2017			2019			2018			2017			2019			2018			2017
Net (loss) gain arising during the period	$	(816	)	$	(397	)	$	(19	)	$	(227	)	$	(505	)	$	309		$	112		$	186		$	170
Prior service (cost) credit arising during the period	(4		)	(4		)	(13		)	(1		)	(10		)	22			(11		)	2			(31		)
	$	(820	)	$	(401	)	$	(32	)	$	(228	)	$	(515	)	$	331		$	101		$	188		$	139
Net loss amortization included in benefit cost	$	151		$	232		$	180		$	64		$	84		$	98		$	(10	)	$	1		$	1
Prior service credit amortization included in benefit cost	(49		)	(50		)	(53		)	(12		)	(13		)	(11		)	(78		)	(84		)	(98		)
	$	102		$	182		$	127		$	52		$	71		$	87		$	(88	)	$	(83	)	$	(97	)

Actuarial Assumptions

The Company reassesses its benefit plan assumptions on a regular basis. The weighted average assumptions used in determining U.S. pension and other postretirement benefit plan and international pension plan information are as follows:

	U.S. Pension and Other Postretirement Benefit Plans						International Pension Plans
December 31	2019		2018		2017		2019		2018		2017
Net periodic benefit cost
Discount rate	4.40	%	3.70	%	4.30	%	2.20	%	2.10	%	2.20	%
Expected rate of return on plan assets	8.10	%	8.20	%	8.70	%	4.90	%	5.10	%	5.10	%
Salary growth rate	4.30	%	4.30	%	4.30	%	2.80	%	2.90	%	2.90	%
Interest crediting rate	3.40	%	3.30	%	3.30	%	2.90	%	2.80	%	3.00	%
Benefit obligation
Discount rate	3.40	%	4.40	%	3.70	%	1.50	%	2.20	%	2.10	%
Salary growth rate	4.20	%	4.30	%	4.30	%	2.80	%	2.80	%	2.90	%
Interest crediting rate	4.90	%	3.40	%	3.30	%	2.80	%	2.90	%	2.80	%

For both the pension and other postretirement benefit plans, the discount rate is evaluated on measurement dates and modified to reflect the prevailing market rate of a portfolio of high-quality fixed-income debt instruments that would provide the future cash flows needed to pay the benefits included in the benefit obligation as they come due. The expected rate of return for both the pension and other postretirement benefit plans represents the average rate of return to be earned on plan assets over the period the benefits included in the benefit obligation are to be paid and is determined on a plan basis. The expected rate of return for each plan is developed considering long-term historical returns data, current market conditions, and actual returns on the plan assets. Using this reference information, the long-term return expectations for each asset category and a weighted-average expected return for each plan’s target portfolio is developed, according to the allocation among those investment categories. The expected portfolio performance reflects the contribution of active management as appropriate. For 2020, the expected rate of return for the Company’s U.S. pension and other postretirement benefit plans will range from 7.00% to 7.30%, as compared to a range of 7.70% to 8.10% in 2019. The decrease reflects lower expected asset returns and a modest shift in asset allocation. The change in the weighted-average expected return on U.S. pension and other postretirement benefit plan assets from 2017 to 2019 is due to the relative weighting of the referenced plans’ assets.

The health care cost trend rate assumptions for other postretirement benefit plans are as follows:

December 31	2019		2018
Health care cost trend rate assumed for next year	6.8	%	7.0	%
Rate to which the cost trend rate is assumed to decline	4.5	%	4.5	%
Year that the trend rate reaches the ultimate trend rate	2032		2032

Savings Plans

The Company also maintains defined contribution savings plans in the United States. The Company matches a percentage of each employee’s contributions consistent with the provisions of the plan for which the employee is eligible. Total employer contributions to these plans in 2019, 2018 and 2017 were $149 million, $136 million and $131 million, respectively.

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Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Sales of Company's Products

Sales of the Company’s products were as follows:

Years Ended December 31	2019						2018						2017
	U.S.		Int’l		Total		U.S.		Int’l		Total		U.S.		Int’l		Total
Pharmaceutical:
Oncology
Keytruda	$	6,305	$	4,779	$	11,084	$	4,150	$	3,021	$	7,171	$	2,309	$	1,500	$	3,809
Alliance revenue - Lynparza (1)	269		176		444		127		61		187		—		20		20
Alliance revenue - Lenvima (1)	239		165		404		95		54		149		—		—		—
Emend	183		205		388		312		210		522		342		213		556
Vaccines
Gardasil/Gardasil 9	1,831		1,905		3,737		1,873		1,279		3,151		1,565		743		2,308
ProQuad/M-M-R II/Varivax	1,683		592		2,275		1,430		368		1,798		1,374		303		1,676
Pneumovax 23	679		247		926		627		281		907		581		240		821
RotaTeq	506		284		791		496		232		728		481		204		686
Vaqta	130		108		238		127		112		239		94		124		218
Hospital Acute Care
Bridion	533		598		1,131		386		531		917		239		465		704
Noxafil	282		380		662		353		389		742		309		327		636
Primaxin	2		271		273		7		258		265		10		270		280
Invanz	30		233		263		253		243		496		361		241		602
Cubicin	92		165		257		191		176		367		189		193		382
Cancidas	6		242		249		12		314		326		20		402		422
Immunology
Simponi	—		830		830		—		893		893		—		819		819
Remicade	—		411		411		—		582		582		—		837		837
Neuroscience
Belsomra	92		214		306		96		164		260		98		112		210
Virology
Isentress/Isentress HD	398		576		975		513		627		1,140		565		639		1,204
Zepatier	118		252		370		8		447		455		771		888		1,660
Cardiovascular
Zetia	14		575		590		45		813		857		352		992		1,344
Vytorin	16		269		285		10		487		497		124		627		751
Atozet	—		391		391		—		347		347		—		225		225
Adempas	—		419		419		—		329		329		—		300		300
Diabetes
Januvia	1,724		1,758		3,482		1,969		1,718		3,686		2,153		1,584		3,737
Janumet	589		1,452		2,041		811		1,417		2,228		863		1,296		2,158
Women’s Health
NuvaRing	742		136		879		722		180		902		564		197		761
Implanon/Nexplanon	568		219		787		495		208		703		496		191		686
Diversified Brands
Singulair	29		669		698		20		688		708		40		692		732
Cozaar/Hyzaar	24		418		442		23		431		453		18		466		484
Nasonex	9		284		293		23		353		376		54		333		387
Arcoxia	—		288		288		—		335		335		—		363		363
Follistim AQ	103		138		241		115		153		268		123		174		298
Other pharmaceutical (2)	1,563		3,343		4,901		1,319		3,380		4,705		1,759		3,556		5,314
Total Pharmaceutical segment sales	18,759		22,992		41,751		16,608		21,081		37,689		15,854		19,536		35,390
Animal Health:
Livestock	582		2,201		2,784		528		2,102		2,630		471		2,013		2,484
Companion Animals	724		885		1,609		710		872		1,582		619		772		1,391
Total Animal Health segment sales	1,306		3,086		4,393		1,238		2,974		4,212		1,090		2,785		3,875
Other segment sales (3)	174		1		175		248		2		250		396		1		397
Total segment sales	20,239		26,079		46,319		18,094		24,057		42,151		17,340		22,322		39,662
Other (4)	86		436		521		118		26		143		84		376		460
	$	20,325	$	26,515	$	46,840	$	18,212	$	24,083	$	42,294	$	17,424	$	22,698	$	40,122

U.S. plus international may not equal total due to rounding.

⁽¹⁾  Alliance revenue represents Merck’s share of profits, which are product sales net of cost of sales and commercialization costs (see Note 4).

⁽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 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 2019, 2018 and 2017 also includes approximately $80 million, $95 million and $85 million, respectively, related to the sale of the marketing rights to certain products.

Consolidated Revenues by Geographic Area

Consolidated sales by geographic area where derived are as follows:

Years Ended December 31	2019		2018		2017
United States	$	20,325	$	18,212	$	17,424
Europe, Middle East and Africa	12,707		12,213		11,478
Japan	3,583		3,212		3,122
China	3,207		2,184		1,586
Asia Pacific (other than Japan and China)	2,943		2,909		2,751
Latin America	2,469		2,415		2,339
Other	1,606		1,149		1,422
	$	46,840	$	42,294	$	40,122

Reconciliation of Segment Profits to Income Before Taxes

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

Years Ended December 31	2019			2018			2017
Segment profits:
Pharmaceutical segment	$	28,324		$	24,871		$	23,018
Animal Health segment	1,609			1,659			1,552
Other segments	(7		)	103			275
Total segment profits	29,926			26,633			24,845
Other profits	363			6			26
Unallocated:
Interest income	274			343			385
Interest expense	(893		)	(772		)	(754		)
Depreciation and amortization	(1,573		)	(1,334		)	(1,378		)
Research and development	(9,499		)	(9,432		)	(10,004		)
Amortization of purchase accounting adjustments	(1,419		)	(2,664		)	(3,056		)
Restructuring costs	(638		)	(632		)	(776		)
Charge related to the termination of a collaboration with Samsung	—			(423		)	—
Loss on extinguishment of debt	—			—			(191		)
Other unallocated, net	(5,077		)	(3,024		)	(2,576		)
Income Before Taxes	$	11,464		$	8,701		$	6,521

Equity Income from Affiliates and Depreciation and Amortization Included in Segment Profits

Equity (income) loss from affiliates and depreciation and amortization included in segment profits is as follows:

	Pharmaceutical		Animal Health		All Other		Total
Year Ended December 31, 2019
Included in segment profits:
Equity (income) loss from affiliates	$	—	$	—	$	—	$	—
Depreciation and amortization	137		109		10		256
Year Ended December 31, 2018
Included in segment profits:
Equity (income) loss from affiliates	$	4	$	—	$	—	$	4
Depreciation and amortization	243		82		10		335
Year Ended December 31, 2017
Included in segment profits:
Equity (income) loss from affiliates	$	7	$	—	$	—	$	7
Depreciation and amortization	125		75		12		212

Property, Plant and Equipment, Net by Geographic Area

Property, plant and equipment, net, by geographic area where located is as follows:

December 31	2019		2018		2017
United States	$	8,974	$	8,306	$	8,070
Europe, Middle East and Africa	4,767		3,706		3,151
Asia Pacific (other than Japan and China)	714		684		632
Latin America	266		264		271
China	174		167		150
Japan	152		159		158
Other	6		5		7
	$	15,053	$	13,291	$	12,439

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Acquisitions, Divestitures, Research Collaborations and License Agreements - Divestitures Narrative (Detail) - Samsung $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Acquisitions Divestitures Research Collaborations and License Agreements Transactions [Line Items]
Gain (loss) on contract termination	$ (423)
Contract termination fee payment	155
Other contract termination costs	9
Fixed asset abandonment costs related to contract termination	137
Inventory write-off related to contract termination	$ 122

XML

Financial Instruments - Summarized Information About Changes in Liabilities for Contingent Consideration (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration	$ 788	$ 935
Changes in estimated fair value	64	89
Additions	0	8
Payments	(85)	(244)
Contingent consideration	767	788
Contingent consideration, liability, current	$ 114
Sanofi Pasteur
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.115
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration	$ 614
Contingent consideration	$ 625	$ 614
Measurement Input, Discount Rate | Sanofi Pasteur
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.08

XML

Pension and Other Postretirement Benefit Plans - Components of Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net loss amortization included in benefit cost	$ 112	$ 186	$ 170
Prior service (cost) credit arising during the period	(11)	2	(31)
Total	101	188	139
Net loss amortization included in benefit cost	(10)	1	1
Prior service credit amortization included in benefit cost	(78)	(84)	(98)
Total	(88)	(83)	(97)
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net loss amortization included in benefit cost	(816)	(397)	(19)
Prior service (cost) credit arising during the period	(4)	(4)	(13)
Total	(820)	(401)	(32)
Net loss amortization included in benefit cost	151	232	180
Prior service credit amortization included in benefit cost	(49)	(50)	(53)
Total	102	182	127
International | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net loss amortization included in benefit cost	(227)	(505)	309
Prior service (cost) credit arising during the period	(1)	(10)	22
Total	(228)	(515)	331
Net loss amortization included in benefit cost	64	84	98
Prior service credit amortization included in benefit cost	(12)	(13)	(11)
Total	$ 52	$ 71	$ 87

XML

Pension and Other Postretirement Benefit Plans - Fair Values of Pension Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 860	$ 826
United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,361	9,648	$ 10,896
United States | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	239	222
United States | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,747	3,190
United States | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	888	841
United States | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	173	161
United States | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	32
United States | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,451	2,172
United States | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,094	1,509
United States | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,582	1,246
United States | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	178	262
United States | Other, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	13
United States | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,824	2,502
United States | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	40
United States | Level 1 | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	205	169
United States | Level 1 | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	165	121
United States | Level 1 | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 1 | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 1 | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,451	2,172
United States | Level 1 | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 1 | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 1 | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 1 | Other, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,854	3,017
United States | Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 2 | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 2 | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 2 | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 2 | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 2 | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 2 | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,094	1,509
United States | Level 2 | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,582	1,246
United States | Level 2 | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	178	262
United States | Level 2 | Other, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	13	15
United States | Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 3 | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 3 | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 3 | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 3 | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 3 | Real estate, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0	0
United States | Level 3 | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 3 | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 3 | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 3 | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Level 3 | Insurance contracts, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0	0
United States | Level 3 | Other, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	13	15
United States | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,674	4,116
United States | NAV | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	236	182
United States | NAV | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,542	3,021
United States | NAV | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	723	720
United States | NAV | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	173	161
United States | NAV | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	32
United States | NAV | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | NAV | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | NAV | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | NAV | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | NAV | Other, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,163	8,580	9,339
International | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	86	69
International | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,403	3,607
International | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	252	251
International | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,203	2,634
International | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	125	105
International | Fixed income obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15	11
International | Real estate, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	2
International | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	565	544
International | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	379	293
International | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	136	114
International | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	61	55
International | Insurance contracts, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	916	877
International | Other, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	18
International | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,727	1,497
International | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	70	50
International | Level 1 | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	546	461
International | Level 1 | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	66	56
International | Level 1 | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	462	372
International | Level 1 | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	4
International | Level 1 | Fixed income obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	7
International | Level 1 | Real estate, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 1 | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	565	544
International | Level 1 | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	2
International | Level 1 | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	1
International | Level 1 | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 1 | Insurance contracts, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 1 | Other, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,052	5,809
International | Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	3
International | Level 2 | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,761	3,071
International | Level 2 | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	96	112
International | Level 2 | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,534	2,082
International | Level 2 | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11	7
International | Level 2 | Fixed income obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	4
International | Level 2 | Real estate, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	1
International | Level 2 | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 2 | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	376	291
International | Level 2 | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	135	113
International | Level 2 | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	61	55
International | Level 2 | Insurance contracts, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	65	66
International | Level 2 | Other, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	4
International | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	851	813	473
International | Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 3 | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 3 | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 3 | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 3 | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 3 | Fixed income obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 3 | Real estate, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	1	2
International | Level 3 | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 3 | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 3 | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 3 | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Level 3 | Insurance contracts, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	851	811	470
International | Level 3 | Other, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	1	$ 1
International | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	533	461
International | NAV | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15	16
International | NAV | Developed markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	96	75
International | NAV | Emerging markets equities, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	90	83
International | NAV | Government and agency obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	207	180
International | NAV | Corporate obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	109	94
International | NAV | Fixed income obligations, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | NAV | Real estate, Investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | NAV | Developed markets, Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | NAV | Government and agency obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | NAV | Corporate obligations, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | NAV | Mortgage and asset backed-securities, Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | NAV | Insurance contracts, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | NAV | Other, Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 16	$ 13

XML

Financial Instruments - Location and Pretax (Gains) or Loss Amounts for Derivatives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Sales	$ 46,840	$ 42,294	$ 40,122
Other (income) expense, net	139	(402)	(500)
Other comprehensive income (loss)	(648)	(361)	316
Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in OCI on derivatives	(6)	(4)	(3)
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in OCI on derivatives	87	228	(562)
(Decrease) increase in Sales as a result of AOCI reclassifications	(255)	160	(138)
Other (income) expense, net | Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	(95)	27	48
Derivatives designated as hedging instruments	65	(50)	(12)
Derivative, Gain (Loss) on Derivative, Net	(4)	(4)	(3)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Sales	$ 255	$ (160)	$ 138

XML

Other (Income) Expense, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Interest income	$ (274)	$ (343)	$ (385)
Interest expense	893	772	754
Exchange losses (gains)	187	145	(11)
Income on investments in equity securities, net	(170)	(324)	(352)
Net periodic defined benefit plan (credit) cost other than service cost	(545)	(512)	(512)
Other, net	48	(140)	6
Other (income) expense, net	$ 139	$ (402)	$ (500)

XML

Goodwill and Other Intangibles - Goodwill Activity by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 18,253	$ 18,284
Acquisitions	1,341	41
Impairments	(162)	(144)
Other	(7)	72
Goodwill, Ending Balance	19,425	18,253
Accumulated goodwill impairment losses	531	369
Pharmaceutical
Goodwill [Roll Forward]
Goodwill, Beginning Balance	16,162	16,066
Acquisitions	19	0
Impairments	0	0
Other	0	96
Goodwill, Ending Balance	16,181	16,162
Animal Health
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,870	1,877
Acquisitions	1,322	17
Impairments	0	0
Other	0	(24)
Goodwill, Ending Balance	3,192	1,870
All Other
Goodwill [Roll Forward]
Goodwill, Beginning Balance	221	341
Acquisitions	0	24
Impairments	(162)	(144)
Other	(7)	0
Goodwill, Ending Balance	$ 52	$ 221

XML

Financial Instruments - Information About Interest Rate Swaps (Details)	Dec. 31, 2019 USD ($) interest_rate_swap	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Derivative [Line Items]
Par Value of Debt		$ 5,000,000,000.0
Number of Interest Rate Swaps Held | interest_rate_swap	19
U.S. Dollar Notional	$ 30,666,000,000		$ 29,742,000,000
1.85% notes due 2020 | Interest Rate Swap
Derivative [Line Items]
Par Value of Debt	$ 1,250,000,000
Number of Interest Rate Swaps Held | interest_rate_swap	5
U.S. Dollar Notional	$ 1,250,000,000
Fixed-rate notes, stated interest rate (as percent)	1.85%
3.875% notes due 2021 | Interest Rate Swap
Derivative [Line Items]
Par Value of Debt	$ 1,150,000,000
Number of Interest Rate Swaps Held | interest_rate_swap	5
U.S. Dollar Notional	$ 1,150,000,000
Fixed-rate notes, stated interest rate (as percent)	3.875%
2.40% notes due 2022 | Interest Rate Swap
Derivative [Line Items]
Par Value of Debt	$ 1,000,000,000
Number of Interest Rate Swaps Held | interest_rate_swap	4
U.S. Dollar Notional	$ 1,000,000,000
Fixed-rate notes, stated interest rate (as percent)	2.40%
2.35% notes due 2022 | Interest Rate Swap
Derivative [Line Items]
Par Value of Debt	$ 1,250,000,000
Number of Interest Rate Swaps Held | interest_rate_swap	5
U.S. Dollar Notional	$ 1,250,000,000
Fixed-rate notes, stated interest rate (as percent)	2.35%

XML

Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 927	$ 658	$ 927
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs	251	21	138
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs	34	3	2
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring costs	4	2	11
Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	638	632	776
Separation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	572	473	552
Separation Costs | Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	0	0
Separation Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	0	0
Separation Costs | Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	0	0
Separation Costs | Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	572	473	552
Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Restructuring costs	233	(1)	60
Accelerated Depreciation | Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs	198	10	52
Accelerated Depreciation | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs	33	2	2
Accelerated Depreciation | Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2	(13)	6
Accelerated Depreciation | Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	0	0
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	122	186	315
Other | Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs	53	11	86
Other | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1	1	0
Other | Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2	15	5
Other | Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 66	$ 159	$ 224

XML

Equity - Narrative (Details) - USD ($) $ in Millions		1 Months Ended	7 Months Ended	12 Months Ended
	Oct. 29, 2018	Apr. 30, 2019	Apr. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 25, 2018
Equity [Abstract]
Common stock, shares authorized				6,500,000,000	6,500,000,000
Preferred stock, shares authorized				20,000,000
Accelerated Share Repurchases [Line Items]
Treasury stock acquired				$ 4,780	$ 9,091	$ 4,014
Accelerated Share Repurchase Agreement, October 29, 2018
Accelerated Share Repurchases [Line Items]
Purchases of treasury stock (in shares)	56,700,000
Accelerated Share Repurchase Agreement
Accelerated Share Repurchases [Line Items]
Shares authorized to be repurchased (in shares)							$ 5,000
Purchases of treasury stock (in shares)		7,700,000	64,400,000
Payment under ASR agreement	$ 5,000
Treasury stock acquired	4,000
Decrease in other-paid-in capital	$ 1,000

XML

Pension and Other Postretirement Benefit Plans - Accumulated and Projected Benefit Obligation in Excess of Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plans with a projected benefit obligation in excess of plan assets, projected benefit obligation	$ 13,003	$ 10,620
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets	11,361	9,648
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation	12,009	9,702
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets	10,484	8,966
International
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plans with a projected benefit obligation in excess of plan assets, projected benefit obligation	7,421	6,251
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets	6,135	5,089
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation	2,476	5,936
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets	$ 1,501	$ 5,071

XML

Loans Payable, Long-Term Debt and Leases - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 22,736		$ 19,806
2.75% notes due 2025
Debt Instrument [Line Items]
Long-term debt	$ 2,492		2,490
Stated interest rate (as percent)	2.75%
3.70% notes due 2045
Debt Instrument [Line Items]
Long-term debt	$ 1,975		1,974
Stated interest rate (as percent)	3.70%
2.80% notes due 2023
Debt Instrument [Line Items]
Long-term debt	$ 1,747		1,745
Stated interest rate (as percent)	2.80%
3.40% notes due 2029
Debt Instrument [Line Items]
Long-term debt	$ 1,732		0
Stated interest rate (as percent)	3.40%	3.40%
4.00% notes due 2049
Debt Instrument [Line Items]
Long-term debt	$ 1,468		0
Stated interest rate (as percent)	4.00%	4.00%
2.35% notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 1,248		1,214
Stated interest rate (as percent)	2.35%
4.15% notes due 2043
Debt Instrument [Line Items]
Long-term debt	$ 1,238		1,237
Stated interest rate (as percent)	4.15%
3.875% notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 1,151		1,132
Stated interest rate (as percent)	3.875%
1.125% euro-denominated notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 1,113		1,134
Stated interest rate (as percent)	1.125%
1.875% euro-denominated notes due 2026
Debt Instrument [Line Items]
Long-term debt	$ 1,107		1,127
Stated interest rate (as percent)	1.875%
2.40% notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 1,010		983
Stated interest rate (as percent)	2.40%
3.90% notes due 2039
Debt Instrument [Line Items]
Long-term debt	$ 982		0
Stated interest rate (as percent)	3.90%	3.90%
2.90% notes due 2024
Debt Instrument [Line Items]
Long-term debt	$ 745		0
Stated interest rate (as percent)	2.90%	2.90%
6.50% notes due 2033
Debt Instrument [Line Items]
Long-term debt	$ 722		726
Stated interest rate (as percent)	6.50%
0.50% euro-denominated notes due 2024
Debt Instrument [Line Items]
Long-term debt	$ 555		565
Stated interest rate (as percent)	0.50%
1.375% euro-denominated notes due 2036
Debt Instrument [Line Items]
Long-term debt	$ 551		561
Stated interest rate (as percent)	1.375%
2.50% euro-denominated notes due 2034
Debt Instrument [Line Items]
Long-term debt	$ 550		560
Stated interest rate (as percent)	2.50%
3.60% notes due 2042
Debt Instrument [Line Items]
Long-term debt	$ 490		490
Stated interest rate (as percent)	3.60%
6.55% notes due 2037
Debt Instrument [Line Items]
Long-term debt	$ 412		414
Stated interest rate (as percent)	6.55%
5.75% notes due 2036
Debt Instrument [Line Items]
Long-term debt	$ 338		338
Stated interest rate (as percent)	5.75%
5.95% debentures due 2028
Debt Instrument [Line Items]
Long-term debt	$ 306		306
Stated interest rate (as percent)	5.95%
5.85% notes due 2039
Debt Instrument [Line Items]
Long-term debt	$ 271		270
Stated interest rate (as percent)	5.85%
6.40% debentures due 2028
Debt Instrument [Line Items]
Long-term debt	$ 250		250
Stated interest rate (as percent)	6.40%
6.30% debentures due 2026
Debt Instrument [Line Items]
Long-term debt	$ 135		135
Stated interest rate (as percent)	6.30%
1.85% notes due 2020
Debt Instrument [Line Items]
Long-term debt	$ 0		$ 1,231
Stated interest rate (as percent)			1.85%
Floating-rate notes due 2020
Debt Instrument [Line Items]
Long-term debt	0		$ 699
Other
Debt Instrument [Line Items]
Long-term debt	$ 148		$ 225

XML

Share-Based Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement [Abstract]
Shares collectively authorized for future grants under share-based compensation plans (in shares)	111,000,000
Quantity of stock options that vest per year (as percent)	33.33%
Period over which share-based payment awards vest	3 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax share-based compensation cost	$ 417	$ 348	$ 312
Income tax benefits related to share-based compensation	$ 57	$ 55	$ 57
Weighted average exercise price of options granted (in dollars per share)	$ 80.05	$ 58.15	$ 63.88
Weighted average fair value of options granted (in dollars per share)	$ 10.63	$ 8.26	$ 7.04
Total pre tax unrecognized compensation expense related to nonvested stock options, RSU and PSU awards	$ 603
Weighted average period in years of recognition for nonvested stock options, RSU and PSU awards	1 year 10 months 24 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of options	7 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of options	10 years

XML

Share-Based Compensation Plans - Summary of Nonvested RSU and PSU Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Shares, Nonvested January 1 | shares	16,128
Number of Shares, Granted | shares	4,811
Number of Shares, Vested | shares	(6,594)
Number of Shares, Forfeited | shares	(818)
Number of Shares, Nonvested December 31 | shares	13,527
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Nonvested January 1 (in dollars per share) | $ / shares	$ 58.85
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares	80.08
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares	55.70
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares	64.75
Weighted Average Grant Date Fair Value, Nonvested December 31 (in dollars per share) | $ / shares	$ 67.58
PSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Shares, Nonvested January 1 | shares	2,039
Number of Shares, Granted | shares	763
Number of Shares, Vested | shares	(748)
Number of Shares, Forfeited | shares	(82)
Number of Shares, Nonvested December 31 | shares	1,972
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Nonvested January 1 (in dollars per share) | $ / shares	$ 59.42
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares	83.90
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares	57.87
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares	66.68
Weighted Average Grant Date Fair Value, Nonvested December 31 (in dollars per share) | $ / shares	$ 69.18

XML

Contingencies and Environmental Liabilities - Januvia/Janumet Litigation - Narrative (Details) - Januvia	Dec. 31, 2019 legalmatter
Loss Contingencies [Line Items]
Loss contingency, pending claims number	1,380
Cases Company Agreed To Toll Statute Of Limitations
Loss Contingencies [Line Items]
Loss contingency, pending claims number	50
Other State Court
Loss Contingencies [Line Items]
Loss contingency, pending claims number	6

XML

Restructuring

12 Months Ended

Dec. 31, 2019

Restructuring and Related Activities [Abstract]

Restructuring

Restructuring

In early 2019, Merck approved a new global restructuring program (Restructuring Program) as part of a worldwide initiative focused on further optimizing the Company’s manufacturing and supply network, as well as reducing its global real estate footprint. This program is a continuation of the Company’s plant rationalization, builds on prior restructuring programs and does not include any actions associated with the planned spin-off of NewCo. As the Company continues to evaluate its global footprint and overall operating model, it has subsequently identified additional actions under the Restructuring Program, and could identify further actions over time. The actions currently contemplated under the Restructuring Program are expected to be substantially completed by the end of 2023, with the cumulative pretax costs to be incurred by the Company to implement the program now estimated to be approximately $2.5 billion. The Company estimates that approximately 60% of the cumulative pretax costs will result in cash outlays, primarily related to employee separation expense and facility shut-down costs. Approximately 40% of the cumulative pretax costs will be non-cash, relating primarily to the accelerated depreciation of facilities to be closed or divested. The Company expects to record charges of approximately $800 million in 2020 related to the Restructuring Program. Actions under previous global restructuring programs have been substantially completed.

The Company recorded total pretax costs of $927 million in 2019, $658 million in 2018 and $927 million in 2017 related to restructuring program activities. For segment reporting, restructuring charges are unallocated expenses.

The following table summarizes the charges related to restructuring program activities by type of cost:

	Separation Costs		Accelerated Depreciation			Other		Total
Year Ended December 31, 2019
Cost of sales	$	—	$	198		$	53	$	251
Selling, general and administrative	—		33			1		34
Research and development	—		2			2		4
Restructuring costs	572		—			66		638
	$	572	$	233		$	122	$	927
Year Ended December 31, 2018
Cost of sales	$	—	$	10		$	11	$	21
Selling, general and administrative	—		2			1		3
Research and development	—		(13		)	15		2
Restructuring costs	473		—			159		632
	$	473	$	(1	)	$	186	$	658
Year Ended December 31, 2017
Cost of sales	$	—	$	52		$	86	$	138
Selling, general and administrative	—		2			—		2
Research and development	—		6			5		11
Restructuring costs	552		—			224		776
	$	552	$	60		$	315	$	927

Separation costs are associated with actual headcount reductions, as well as those headcount reductions which were probable and could be reasonably estimated.

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 the sites have and will continue to operate up through the respective closure dates and, since future undiscounted cash flows are 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 2019, 2018 and 2017 includes asset abandonment, facility shut-down and other related costs, as well as pretax gains and losses resulting from the sales of facilities and related assets. Additionally, other activity includes certain employee-related costs associated with pension and other postretirement benefit plans (see Note 13) and share-based compensation.

The following table summarizes the charges and spending relating to restructuring program activities:

	Separation Costs			Accelerated Depreciation			Other			Total
Restructuring reserves January 1, 2018	$	619		$	—		$	128		$	747
Expenses	473			(1		)	186			658
(Payments) receipts, net	(649		)	—			(238		)	(887		)
Non-cash activity	—			1			15			16
Restructuring reserves December 31, 2018	443			—			91			534
Expenses	572			233			122			927
(Payments) receipts, net	(325		)	—			(136		)	(461		)
Non-cash activity	—			(233		)	(8		)	(241		)
Restructuring reserves December 31, 2019 (1)	$	690		$	—		$	69		$	759

⁽¹⁾ 

The remaining cash outlays are expected to be substantially completed by the end of 2023.

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Nature of Operations

12 Months Ended

Dec. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Operations

Nature of Operations

Merck & Co., Inc. (Merck or the Company) is a global health care company that delivers innovative health solutions through its prescription medicines, vaccines, biologic therapies and animal health products. The Company’s operations are principally managed on a products basis and include four operating segments, which are the Pharmaceutical, Animal Health, Healthcare Services and Alliances segments. The Pharmaceutical and Animal Health segments are the only reportable segments.

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. Human health 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.

The Animal Health segment discovers, develops, manufactures and markets a wide range of veterinary pharmaceutical and vaccine products, as well as health management solutions and services, for the prevention, treatment and control of disease in all major livestock and companion animal species. The Company also offers an extensive suite of digitally connected identification, traceability and monitoring products. The Company sells its products to veterinarians, distributors and animal producers.

The 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. The Company has recently sold certain businesses in the Healthcare Services segment and is in the process of divesting the remaining businesses.

The Alliances segment primarily includes activity from the Company’s relationship with AstraZeneca LP related to sales of Nexium and Prilosec, which concluded in 2018.

Planned Spin-Off of Women’s Health, Legacy Brands and Biosimilars into New Company

In February 2020, Merck announced its intention to spin-off products from its women’s health, trusted legacy brands and biosimilars businesses into a new, yet-to-be-named, independent, publicly traded company (NewCo) through a distribution of NewCo’s publicly traded stock to Company shareholders. The distribution is expected to qualify as tax-free to the Company and its shareholders for U.S. federal income tax purposes. The legacy brands included in the transaction consist of dermatology, pain, respiratory, and select cardiovascular products including Zetia and Vytorin, as well as the rest of Merck’s diversified brands franchise. Merck’s existing research pipeline programs will continue to be owned and developed within Merck as planned. NewCo will have development capabilities initially focused on late-stage development and life-cycle management, and is expected over time to develop research capabilities in selected therapeutic areas. The spin-off is expected to be completed in the first half of 2021, subject to market and certain other conditions. Subsequent to the spin-off, the historical results of the woman’s health, legacy brands and biosimilars businesses will be reflected as discontinued operations in the Company’s consolidated financial statements.

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Loans Payable, Long-Term Debt and Leases

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Loans Payable, Long-Term Debt and Other Commitments

Loans Payable, Long-Term Debt and Leases

Loans Payable

Loans payable at December 31, 2019 included $1.9 billion of notes due in 2020, $1.4 billion of commercial paper and $226 million of long-dated notes that are subject to repayment at the option of the holders. Loans payable at December 31, 2018 included $5.1 billion of commercial paper and $149 million of long-dated notes that are subject to repayment at the option of the holders. The weighted-average interest rate of commercial paper borrowings was 2.23% and 2.09% for the years ended December 31, 2019 and 2018, respectively.

Long-Term Debt

Long-term debt at December 31 consisted of:

	2019		2018
2.75% notes due 2025	$	2,492	$	2,490
3.70% notes due 2045	1,975		1,974
2.80% notes due 2023	1,747		1,745
3.40% notes due 2029	1,732		—
4.00% notes due 2049	1,468		—
2.35% notes due 2022	1,248		1,214
4.15% notes due 2043	1,238		1,237
3.875% notes due 2021	1,151		1,132
1.125% euro-denominated notes due 2021	1,113		1,134
1.875% euro-denominated notes due 2026	1,107		1,127
2.40% notes due 2022	1,010		983
3.90% notes due 2039	982		—
2.90% notes due 2024	745		—
6.50% notes due 2033	722		726
0.50% euro-denominated notes due 2024	555		565
1.375% euro-denominated notes due 2036	551		561
2.50% euro-denominated notes due 2034	550		560
3.60% notes due 2042	490		490
6.55% notes due 2037	412		414
5.75% notes due 2036	338		338
5.95% debentures due 2028	306		306
5.85% notes due 2039	271		270
6.40% debentures due 2028	250		250
6.30% debentures due 2026	135		135
1.85% notes due 2020	—		1,231
Floating-rate notes due 2020	—		699
Other	148		225
	$	22,736	$	19,806

Other (as presented in the table above) includes $147 million and $223 million at December 31, 2019 and 2018, respectively, of borrowings at variable rates that resulted in effective interest rates of 2.54% and 2.27% for 2019 and 2018, respectively.

With the exception of the 6.30% debentures due 2026, the notes listed in the table above are redeemable in whole or in part, at Merck’s option at any time, at varying redemption prices.

In March 2019, the Company issued $5.0 billion principal amount of senior unsecured notes consisting of $750 million of 2.90% notes due 2024, $1.75 billion of 3.40% notes due 2029, $1.0 billion of 3.90% notes due 2039, and $1.5 billion of 4.00% notes due 2049. The Company used the net proceeds from the offering of $5.0 billion for general corporate purposes, including the repayment of outstanding commercial paper borrowings.

Effective as of November 3, 2009, the Company executed a full and unconditional guarantee of the then existing debt of its subsidiary Merck Sharp & Dohme Corp. (MSD) and MSD executed a full and unconditional guarantee of the then existing debt of the Company (excluding commercial paper), including for payments of principal and interest. These guarantees do not extend to debt issued subsequent to that date.

Certain of the Company’s borrowings require that Merck comply with covenants and, at December 31, 2019, the Company was in compliance with these covenants.

The aggregate maturities of long-term debt for each of the next five years are as follows: 2020, $1.9 billion; 2021, $2.3 billion; 2022, $2.3 billion; 2023, $1.7 billion; 2024, $1.3 billion.

The Company has a $6.0 billion credit facility that matures in June 2024. 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.

Leases

As discussed in Note 1, on January 1, 2019, Merck adopted new guidance for the accounting and reporting of leases. The Company has operating leases primarily for manufacturing facilities, research and development facilities, corporate offices, employee housing, vehicles and certain equipment. As permitted under the transition guidance in ASC 842, the Company elected a package of practical expedients which, among other provisions, allowed the Company to carry forward historical lease classifications. The Company determines if an arrangement is a lease at inception. When evaluating contracts for embedded leases, the Company exercises judgment to determine if there is an explicit or implicit identified asset in the contract and if Merck controls the use of that asset. Embedded leases, primarily associated with contract manufacturing organizations, are immaterial.

Under ASC 842 transition guidance, Merck elected the hindsight practical expedient to determine the lease term for existing leases, which permits companies to consider available information prior to the effective date of the new guidance as to the actual or likely exercise of options to extend or terminate the lease. The lease term includes options to extend or terminate the lease when it is reasonably certain that Merck will exercise that option. Real estate leases for facilities have an average remaining lease term of eight years, which include options to extend the leases for up to four years where applicable. Vehicle leases are generally in effect for four years. The Company has made an accounting policy election not to record short-term leases (leases with an initial term of 12 months or less) on the balance sheet; however, Merck currently has no short-term leases.

Lease expense for operating lease payments is recognized on a straight-line basis over the term of the lease. Operating lease assets and liabilities are recognized based on the present value of lease payments over the lease term. Since the Company’s leases do not have a readily determinable implicit discount rate, the Company uses its incremental borrowing rate to calculate the present value of lease payments by asset class. On a quarterly basis, an updated incremental borrowing rate is determined based on the average remaining lease term of each asset class and the Company’s pretax cost of debt for that same term. The updated rates for each asset class are applied prospectively to new leases. As a practical expedient, the Company has made an accounting policy election for all asset classes not to separate lease components (e.g. payments for rent, real estate taxes and insurance costs) from non-lease components (e.g. common-area maintenance costs) in the event that the agreement contains both. Merck includes both the lease and non-lease components for purposes of calculating the right-of-use asset and related lease liability (if the non-lease components are fixed). For vehicle leases and employee housing, the Company applies a portfolio approach to effectively account for the operating lease assets and liabilities.

Certain of the Company’s lease agreements contain variable lease payments that are adjusted periodically for inflation or for actual operating expense true-ups compared with estimated amounts; however, these amounts are immaterial. Sublease income and activity related to sale and leaseback transactions are immaterial. Merck’s lease agreements do not contain any material residual value guarantees or material restrictive covenants.

Operating lease cost was $339 million in 2019. Cash paid for amounts included in the measurement of operating lease liabilities was $281 million in 2019. Operating lease assets obtained in exchange for lease obligations was $129 million in 2019.

Supplemental balance sheet information related to operating leases is as follows:

December 31	2019
Assets
Other Assets (1)	$	1,073
Liabilities
Accrued and other current liabilities	236
Other Noncurrent Liabilities	768
	$	1,004
Weighted-average remaining lease term (years)	7.4
Weighted-average discount rate	3.2		%

⁽¹⁾ Includes prepaid leases that have no related lease liability.

Maturities of operating leases liabilities are as follows:

2020	$	264
2021	200
2022	168
2023	113
2024	89
Thereafter	297
Total lease payments	1,131
Less: Imputed interest	127
	$	1,004

At December 31, 2019, the Company had entered into additional real estate operating leases that had not yet commenced. The obligations associated with these leases total $538 million, of which $221 million relates to a lease that will commence in April 2020 and has a lease term of 10 years.

As of December 31, 2018, prior to the adoption of ASC 842, the minimum aggregate rental commitments under noncancellable leases were as follows: 2019, $188 million; 2020, $198 million; 2021, $150 million; 2022, $134 million; 2023, $84 million and thereafter, $243 million.

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Inventories (Tables)

12 Months Ended

Dec. 31, 2019

Inventory Disclosure [Abstract]

Inventories

Inventories at December 31 consisted of:

	2019			2018
Finished goods	$	1,772		$	1,658
Raw materials and work in process	5,650			5,004
Supplies	207			194
Total (approximates current cost)	7,629			6,856
(Decrease) increase to LIFO cost	(171		)	1
	$	7,458		$	6,857
Recognized as:
Inventories	$	5,978		$	5,440
Other assets	1,480			1,417

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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

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

The weighted average fair value of options granted in 2019, 2018 and 2017 was $10.63, $8.26 and $7.04 per option, respectively, and were determined using the following assumptions:

Years Ended December 31	2019		2018		2017
Expected dividend yield	3.2	%	3.4	%	3.6	%
Risk-free interest rate	2.4	%	2.9	%	2.0	%
Expected volatility	18.7	%	19.1	%	17.8	%
Expected life (years)	5.9		6.1		6.1

Summarized Information Relative to Stock Option Plan Activity

Summarized information relative to stock option plan activity (options in thousands) is as follows:

	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding January 1, 2019	23,807		$	51.89
Granted	2,796		80.05
Exercised	(8,119	)	44.48
Forfeited	(616	)	45.48
Outstanding December 31, 2019	17,868		$	59.88	6.48	$	555
Exercisable December 31, 2019	11,837		$	55.40	5.45	$	421

Additional Information Pertaining to Stock Option Plans

Additional information pertaining to stock option plans is provided in the table below:

Years Ended December 31	2019		2018		2017
Total intrinsic value of stock options exercised	$	295	$	348	$	236
Fair value of stock options vested	27		29		30
Cash received from the exercise of stock options	361		591		499

Summary of Nonvested RSU and PSU Activity

A summary of nonvested RSU and PSU activity (shares in thousands) is as follows:

	RSUs				PSUs
	Number of Shares		Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value
Nonvested January 1, 2019	16,128		$	58.85	2,039		$	59.42
Granted	4,811		80.08		763		83.90
Vested	(6,594	)	55.70		(748	)	57.87
Forfeited	(818	)	64.75		(82	)	66.68
Nonvested December 31, 2019	13,527		$	67.58	1,972		$	69.18

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Consolidated Statement of Equity - USD ($) $ in Millions	Total	Common Stock	Other Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Non- controlling Interests
Beginning Balance at Dec. 31, 2016	$ 40,308	$ 1,788	$ 39,939	$ 44,133	$ (5,226)	$ (40,546)	$ 220
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Merck & Co., Inc.	2,394			2,394
Other comprehensive income (loss), net of taxes	316				316
Cash dividends declared on common stock ($2.26 per share in 2019, $1.99 per share in 2018 and $1.89 per share in 2017)	(5,177)			(5,177)
Treasury stock shares purchased	(4,014)					(4,014)
Acquisition of Vallée S.A.	7						7
Net income (loss) attributable to noncontrolling interests	24						24
Distributions attributable to noncontrolling interests	(18)						(18)
Share-based compensation plans and other	729		(37)			766
Ending Balance at Dec. 31, 2017	34,569	1,788	39,902	41,350	(4,910)	(43,794)	233
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standards	48			322	(274)
Net Income Attributable to Merck & Co., Inc.	6,220			6,220
Other comprehensive income (loss), net of taxes	(361)				(361)
Cash dividends declared on common stock ($2.26 per share in 2019, $1.99 per share in 2018 and $1.89 per share in 2017)	(5,313)			(5,313)
Treasury stock shares purchased	(9,091)		(1,000)			(8,091)
Net income (loss) attributable to noncontrolling interests	(27)						(27)
Distributions attributable to noncontrolling interests	(25)						(25)
Share-based compensation plans and other	862		(94)			956
Ending Balance at Dec. 31, 2018	26,882	1,788	38,808	42,579	(5,545)	(50,929)	181
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Merck & Co., Inc.	9,843			9,843
Other comprehensive income (loss), net of taxes	(648)				(648)
Cash dividends declared on common stock ($2.26 per share in 2019, $1.99 per share in 2018 and $1.89 per share in 2017)	(5,820)			(5,820)
Treasury stock shares purchased	(4,780)		1,000			(5,780)
Net income (loss) attributable to noncontrolling interests	(66)						(66)
Distributions attributable to noncontrolling interests	(21)						(21)
Share-based compensation plans and other	611		(148)			759
Ending Balance at Dec. 31, 2019	$ 26,001	$ 1,788	$ 39,660	$ 46,602	$ (6,193)	$ (55,950)	$ 94

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Earnings Per Share - Calculations of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to Merck & Co., Inc.	$ 9,843	$ 6,220	$ 2,394
Average common shares outstanding (in shares)	2,565	2,664	2,730
Common shares issuable (in shares)	15	15	18
Average common shares outstanding assuming dilution (in shares)	2,580	2,679	2,748
Basic earnings per common share attributable to Merck & Co., Inc. common shareholders (in dollars per share)	$ 3.84	$ 2.34	$ 0.88
Earnings per common share assuming dilution attributable to Merck & Co., Inc. common shareholders (in dollars per share)	$ 3.81	$ 2.32	$ 0.87

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Consolidated Statement of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Sales	$ 46,840	$ 42,294	$ 40,122
Costs, Expenses and Other
Cost of sales	14,112	13,509	12,912
Selling, general and administrative	10,615	10,102	10,074
Research and development	9,872	9,752	10,339
Restructuring costs	638	632	776
Other (income) expense, net	139	(402)	(500)
Total Costs, Expenses and Other	35,376	33,593	33,601
Income Before Taxes	11,464	8,701	6,521
Taxes on Income	1,687	2,508	4,103
Net Income	9,777	6,193	2,418
Less: Net (Loss) Income Attributable to Noncontrolling Interests	(66)	(27)	24
Net Income Attributable to Merck & Co., Inc.	$ 9,843	$ 6,220	$ 2,394
Basic Earnings per Common Share Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share)	$ 3.84	$ 2.34	$ 0.88
Earnings per Common Share Assuming Dilution Attributable to Merck & Co., Inc. Common Shareholders (in dollars per share)	$ 3.81	$ 2.32	$ 0.87

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Taxes on Income - Taxes on Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current provision
Federal	$ 514	$ 536	$ 5,585
Foreign	1,806	2,281	1,229
State	(77)	200	(90)
Total current provision	2,243	3,017	6,724
Deferred provision
Federal	(330)	(402)	(2,958)
Foreign	(240)	(64)	75
State	14	(43)	262
Total deferred provision	(556)	(509)	(2,621)
Taxes on income	$ 1,687	$ 2,508	$ 4,103

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Financial Instruments - Fair Value of Hedges (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Loans payable and current portion of long-term debt
Derivative [Line Items]
Carrying Amount of Hedged Liabilities	$ 1,249	$ 0
Cumulative Amount of Fair Value Hedging Adjustment Increase (Decrease) Included in the Carrying Amount	(1)	0
Long-Term Debt
Derivative [Line Items]
Carrying Amount of Hedged Liabilities	3,409	4,560
Cumulative Amount of Fair Value Hedging Adjustment Increase (Decrease) Included in the Carrying Amount	$ 14	$ (82)

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Restructuring - Charges and Spending Relating to Restructuring Activities by Program (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 534	$ 747
Expenses	927	658	$ 927
(Payments) receipts, net	(461)	(887)
Non-cash activity	(241)	16
Restructuring reserve, ending balance	759	534	747
Separation Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	443	619
Expenses	572	473	552
(Payments) receipts, net	(325)	(649)
Non-cash activity	0	0
Restructuring reserve, ending balance	690	443	619
Accelerated Depreciation
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	0
Expenses	233	(1)	60
(Payments) receipts, net	0	0
Non-cash activity	(233)	1
Restructuring reserve, ending balance	0	0	0
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	91	128
Expenses	122	186	315
(Payments) receipts, net	(136)	(238)
Non-cash activity	(8)	15
Restructuring reserve, ending balance	$ 69	$ 91	$ 128

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Loans Payable, Long-Term Debt and Leases - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2017	Apr. 30, 2020	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, current maturities		$ 1,900,000,000
Loans payable and current portion of long-term debt		3,610,000,000			$ 5,308,000,000
Long-term debt		22,736,000,000			19,806,000,000
Proceeds from debt, net of issuance costs	$ 5,000,000,000.0
Face amount of debt	$ 5,000,000,000.0
Loss on extinguishment of debt			$ 191,000,000
Long-term debt, maturities, repayments of principal in 2020		1,900,000,000
Long-term debt, maturities, repayments of principal in 2021		2,300,000,000
Long-term debt, maturities, repayments of principal in 2022		2,300,000,000
Long-term debt, maturities, repayments of principal in 2023		1,700,000,000
Long-term debt, maturities, repayments of principal in 2024		1,300,000,000
Available borrowing capacity under credit facility		$ 6,000,000,000.0
Operating lease, weighted average remaining lease term		7 years 4 months 24 days
Operating lease, cost		$ 339,000,000
Operating lease, payments		281,000,000
Lessee, operating lease, lease not yet commenced, amount		538,000,000
Operating leases, future minimum payments due, next twelve months					188,000,000
Operating leases, future minimum payments, due in two years					198,000,000
Operating leases, future minimum payments, due in three years					150,000,000
Operating leases, future minimum payments, due in four years					134,000,000
Operating leases, future minimum payments, due in five years					84,000,000
Operating leases, future minimum payments, due thereafter					243,000,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		129,000,000
Other Variable Rate Debt
Debt Instrument [Line Items]
Long-term debt		$ 147,000,000			$ 223,000,000
Effective interest rate (as percent)		2.54%			2.27%
6.30% debentures due 2026
Debt Instrument [Line Items]
Long-term debt		$ 135,000,000			$ 135,000,000
Stated interest rate (as percent)		6.30%
2.90% notes due 2024
Debt Instrument [Line Items]
Long-term debt		$ 745,000,000			0
Stated interest rate (as percent)	2.90%	2.90%
Face amount of debt	$ 750,000,000
3.40% notes due 2029
Debt Instrument [Line Items]
Long-term debt		$ 1,732,000,000			0
Stated interest rate (as percent)	3.40%	3.40%
Face amount of debt	$ 1,750,000,000
3.90% notes due 2039
Debt Instrument [Line Items]
Long-term debt		$ 982,000,000			0
Stated interest rate (as percent)	3.90%	3.90%
Face amount of debt	$ 1,000,000,000.0
4.00% notes due 2049
Debt Instrument [Line Items]
Long-term debt		$ 1,468,000,000			0
Stated interest rate (as percent)	4.00%	4.00%
Face amount of debt	$ 1,500,000,000
Notes Subject To Repayment At Option Of Holder
Debt Instrument [Line Items]
Loans payable and current portion of long-term debt		$ 226,000,000			149,000,000
Commercial paper
Debt Instrument [Line Items]
Loans payable and current portion of long-term debt		$ 1,400,000,000			$ 5,100,000,000
Weighted-average interest rate of commercial paper (as percent)		2.23%			2.09%
Buildings
Debt Instrument [Line Items]
Operating lease, weighted average remaining lease term		8 years
Lessee, operating lease, renewal term		4 years
Vehicles
Debt Instrument [Line Items]
Operating lease, weighted average remaining lease term		4 years
Forecast
Debt Instrument [Line Items]
Lessee, operating lease, lease not yet commenced, amount				$ 221,000,000
Lessee, operating lease,lease not yet commenced, term of contract (in years)				10 years

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Equity - Shareholders' Equity (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Movement in Common Stock and Treasury Stock [Roll Forward]
Balance January 1 (in shares)	3,577,103,522
Balance December 31 (in shares)	3,577,103,522	3,577,103,522
Common Stock
Movement in Common Stock and Treasury Stock [Roll Forward]
Balance January 1 (in shares)	3,577,000,000	3,577,000,000	3,577,000,000
Purchases of treasury stock (in shares)	0	0	0
Issuances (in shares)	0	0	0
Balance December 31 (in shares)	3,577,000,000	3,577,000,000	3,577,000,000
Treasury Stock
Movement in Common Stock and Treasury Stock [Roll Forward]
Balance January 1 (in shares)	985,000,000	880,000,000	828,000,000
Purchases of treasury stock (in shares)	66,000,000	122,000,000	67,000,000
Issuances (in shares)	(13,000,000)	(17,000,000)	(15,000,000)
Balance December 31 (in shares)	1,038,000,000	985,000,000	880,000,000

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Share-Based Compensation Plans - Additional Information Pertaining to Stock Option Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement [Abstract]
Total intrinsic value of stock options exercised	$ 295	$ 348	$ 236
Fair value of stock options vested	27	29	30
Cash received from the exercise of stock options	$ 361	$ 591	$ 499

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Contingencies and Environmental Liabilities - Fosamax Product Liability Litigation - Narrative (Details) - Fosamax - legalmatter	1 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2019
Loss Contingencies [Line Items]
Loss contingency, pending claims number		3,750
Federal Court
Loss Contingencies [Line Items]
Loss contingency, pending claims number		970
Loss contingency, claims dismissed number	650
Loss contingency, claims on appeal, number		515
New Jersey State Court
Loss Contingencies [Line Items]
Loss contingency, pending claims number		2,510
California State Court
Loss Contingencies [Line Items]
Loss contingency, pending claims number		275
Other State Court
Loss Contingencies [Line Items]
Loss contingency, pending claims number		4

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Contingencies and Environmental Liabilities - Environmental Litigation and Matters - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Site Contingency [Line Items]
Accrued liabilities for environmental matters	$ 67	$ 71
Term for paying off environmental liabilities	15 years
Aggregate possible expenditure on environmental matters in excess of amounts accrued	$ 58

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Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Postretirement Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	$ 968	$ 1,114
Actual return on plan assets	203	(72)
Company contributions	14	6
Effects of exchange rate changes	0	0
Benefits paid	(104)	(80)
Settlements	0	0
Other	21	0
Fair value of plan assets December 31	1,102	968	$ 1,114
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation January 1	1,615	1,922
Service cost	48	57	57
Interest cost	69	69	81
Actuarial (gains) losses	21	(341)
Benefits paid	(104)	(80)
Effects of exchange rate changes	1	(6)
Plan amendments	0	(9)
Curtailments	0	0
Termination benefits	5	3	8
Settlements	0	0
Other	18	0
Benefit obligation December 31	1,673	1,615	1,922
Funded status December 31	(571)	(647)
Recognized as:
Other Assets	0	0
Accrued and other current liabilities	(10)	(10)
Other Noncurrent Liabilities	(561)	(637)
United States | Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	9,648	10,896
Actual return on plan assets	2,165	(810)
Company contributions	130	378
Effects of exchange rate changes	0	0
Benefits paid	(582)	(772)
Settlements	0	(44)
Other	0	0
Fair value of plan assets December 31	11,361	9,648	10,896
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation January 1	10,620	11,904
Service cost	293	326	312
Interest cost	458	432	454
Actuarial (gains) losses	2,165	(1,258)
Benefits paid	(582)	(772)
Effects of exchange rate changes	0	0
Plan amendments	0	0
Curtailments	18	13
Termination benefits	31	19	44
Settlements	0	(44)
Other	0	0
Benefit obligation December 31	13,003	10,620	11,904
Funded status December 31	(1,642)	(972)
Recognized as:
Other Assets	0	0
Accrued and other current liabilities	(92)	(47)
Other Noncurrent Liabilities	(1,550)	(925)
International | Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	8,580	9,339
Actual return on plan assets	1,505	(289)
Company contributions	262	167
Effects of exchange rate changes	31	(352)
Benefits paid	(230)	(202)
Settlements	(12)	(106)
Other	27	23
Fair value of plan assets December 31	10,163	8,580	9,339
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation January 1	9,083	9,483
Service cost	238	238	252
Interest cost	177	178	172
Actuarial (gains) losses	1,313	(154)
Benefits paid	(230)	(202)
Effects of exchange rate changes	4	(387)
Plan amendments	1	10
Curtailments	3	(2)
Termination benefits	8	2	4
Settlements	(12)	(106)
Other	27	23
Benefit obligation December 31	10,612	9,083	$ 9,483
Funded status December 31	(449)	(503)
Recognized as:
Other Assets	837	659
Accrued and other current liabilities	(18)	(14)
Other Noncurrent Liabilities	$ (1,268)	$ (1,148)

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Contingencies and Environmental Liabilities

12 Months Ended

Dec. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

Contingencies and Environmental Liabilities

Contingencies and Environmental Liabilities

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 governmental and 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 condition, 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.

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 December 31, 2019, approximately 3,750 cases are pending against Merck in either federal or state court. Plaintiffs in the vast majority of these cases generally allege that they sustained femur fractures and/or other bone injuries (Femur Fractures) in association with the use of Fosamax.

All federal cases involving allegations of Femur Fractures 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.

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). In March 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. Merck filed a petition for a writ of certiorari to the U.S. Supreme Court in August 2017, seeking review of the Third Circuit’s decision. The Supreme Court granted Merck’s petition in June 2018, and in May 2019, the Supreme Court issued its opinion and decided that the Third Circuit had incorrectly concluded that the issue of preemption should be resolved by a jury, and accordingly vacated the judgment of the Third Circuit and remanded the proceedings back to the Third Circuit to address the issue in a manner consistent with the Supreme Court’s opinion. On November 15, 2019, the Third Circuit remanded the cases back to the District Court in order to allow that court to determine in the first instance whether the plaintiffs’ state law claims are preempted by federal law under the standards described by the Supreme Court in its opinion. On December 13, 2019, the District Court ordered Merck to serve its opening brief on or before February 21, 2020, and plaintiffs to file their responsive brief on or before April 22, 2020. Merck may then file a reply on or before May 22, 2020.

Accordingly, as of December 31, 2019, approximately 970 cases were actively pending in the Femur Fracture MDL.

As of December 31, 2019, approximately 2,510 cases alleging Femur Fractures have been filed in New Jersey state court and are pending before Judge James Hyland in Middlesex County. The parties selected an initial group of cases to be reviewed through fact discovery, and Merck has continued to select additional cases to be reviewed.

As of December 31, 2019, approximately 275 cases alleging Femur Fractures have been filed and are pending in California state court. All of the Femur Fracture cases filed in California state court have been coordinated before a single judge in Orange County, California.

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

Discovery is presently stayed in the Femur Fracture MDL and in the state court in California. Merck 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 December 31, 2019, Merck is aware of approximately 1,380 product users alleging that Januvia and/or Janumet caused the development of pancreatic cancer and other injuries.

Most claims have been filed in multidistrict litigation before the U.S. District Court for the Southern District of California (MDL). Outside of the MDL, the majority of claims have been filed in coordinated proceedings before 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 federal preemption.

Plaintiffs appealed in both forums. In November 2017, the U.S. Court of Appeals for the Ninth Circuit vacated the judgment and remanded for further discovery. In November 2018, the California state appellate court reversed and remanded on similar grounds. In March 2019, the parties in the MDL and the California coordinated proceeding agreed to coordinate and adopt a schedule for completing discovery on general causation and preemption issues and for renewing summary judgment and Daubert motions. Under the stipulated case management schedule, the hearings for Daubert and summary judgment motions are expected to take place in June 2020.

As of December 31, 2019, six product users have claims pending against Merck in state courts other than California, including Illinois. In June 2017, the Illinois trial court denied Merck’s motion for summary judgment based on federal preemption. Merck appealed, and the Illinois appellate court affirmed in December 2018. Merck filed a petition for leave to appeal to the Illinois Supreme Court in February 2019. In April 2019, the Illinois Supreme Court stayed consideration of the pending petition to appeal until the U.S. Supreme Court issued its opinion in Merck Sharp & Dohme Corp. v. Albrecht (relating to the Fosamax matter discussed above). Merck filed the opinion in Albrecht with the Illinois Supreme Court in June 2019. The petition for leave to appeal was decided on September 25, 2019, in which the Illinois Supreme Court directed the intermediate appellate court to reconsider its earlier ruling. The Illinois Appellate Court issued a favorable decision concluding, consistent with Albrecht, that preemption presents a legal question to be resolved by the court.

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

Vioxx

As previously disclosed, Merck is a defendant in a lawsuit brought by the Attorney General of Utah alleging that Merck misrepresented the safety of Vioxx. The lawsuit is pending in Utah state court. Utah seeks damages and penalties under the Utah False Claims Act. A bench trial in this matter is currently scheduled for April 20, 2020.

Governmental Proceedings

As previously disclosed, in the fall of 2018, the Company received a records subpoena from the U.S. Attorney’s Office for the District of Vermont (VT USAO) pursuant to Section 248 of the Health Insurance Portability and Accountability Act of 1996 (HIPAA) relating to an investigation of potential health care offenses. The subpoena sought information relating to any actual or potential business relationship or arrangement Merck has had with Practice Fusion, Inc. (PFI), a cloud-based, electronic health records (EHR) company that was acquired by Allscripts in January 2018. The Company cooperated with the government and responded to that subpoena. Subsequently, on May 21, 2019, Merck received a second records subpoena from the VT USAO that broadened the government’s information request by seeking information relating to Merck’s relationship with any EHR company. Shortly thereafter, the VT USAO served a Civil Investigation Demand (CID) upon Merck similarly seeking information on the Company’s relationships with EHR vendors. The CID explains that the government is conducting a False Claims Act investigation concerning whether Merck and/or PFI submitted claims to federal healthcare programs that violate the Federal Anti-Kickback Statute. Merck is cooperating with the government’s investigation.

As previously disclosed, on April 15, 2019, Merck received a set of investigative interrogatories from the California Attorney General’s Office pursuant to its investigation of conduct and agreements that allegedly affected or delayed competition to Lantus in the insulin market. The interrogatories seek information concerning Merck’s development of an insulin glargine product, and its subsequent termination, as well as Merck’s patent litigation against Sanofi S.A. concerning Lantus and the resolution of that litigation. Merck is cooperating with the California Attorney General’s investigation.

As previously disclosed, the Company’s subsidiaries in China have received and may continue to receive inquiries regarding their operations from various Chinese governmental agencies. Some of these inquiries may be

related to matters involving other multinational pharmaceutical companies, as well as Chinese entities doing business with such companies. The Company’s policy is to cooperate with these authorities and to provide responses as appropriate.

As previously disclosed, from time to time, the Company receives inquiries and is the subject of preliminary investigation activities from competition and other governmental authorities in markets outside the United States. These authorities may include regulators, administrative authorities, and law enforcement and other similar officials, and these preliminary investigation activities may include site visits, formal or informal requests or demands for documents or materials, inquiries or interviews and similar matters. Certain of these preliminary inquiries or activities may lead to the commencement of formal proceedings. Should those proceedings be determined adversely to the Company, monetary fines and/or remedial undertakings may be required.

Commercial and Other Litigation

Zetia Antitrust Litigation

As previously disclosed, Merck, MSD, Schering Corporation and MSP Singapore Company LLC (collectively, the Merck Defendants) are defendants in putative class action and opt-out lawsuits filed in 2018 on behalf of direct and indirect purchasers of Zetia alleging violations of federal and state antitrust laws, as well as other state statutory and common law causes of action. The cases have been consolidated for pretrial purposes in a federal multidistrict litigation before Judge Rebecca Beach Smith in the Eastern District of Virginia. In December 2018, the court denied the Merck Defendants’ motions to dismiss or stay the direct purchaser putative class actions pending bilateral arbitration. On August 9, 2019, the district court adopted in full the report and recommendation of the magistrate judge with respect to the Merck Defendants’ motions to dismiss on non-arbitration issues, thereby granting in part and denying in part Merck Defendants’ motions to dismiss. In addition, on June 27, 2019, the representatives of the putative direct purchaser class filed an amended complaint and, on August 1, 2019, retailer opt-out plaintiffs filed an amended complaint. The Merck Defendants moved to dismiss the new allegations in both complaints. On October 15, 2019, the magistrate judge issued a report and recommendation recommending that the district judge grant the motions in their entirety. On December 20, 2019, the district court adopted this report and recommendation in part. The district court granted the Merck Defendants’ motion to dismiss to the extent the motion sought dismissal of claims for overcharges paid by entities that purchased generic ezetimibe from Par Pharmaceutical, Inc. (Par Pharmaceutical) and dismissed any claims for such overcharges. Trial is currently scheduled to begin on October 28, 2020.

Rotavirus Vaccines Antitrust Litigation

As previously disclosed, MSD is a defendant in putative class action lawsuits filed in 2018 on behalf of direct purchasers of RotaTeq, alleging violations of federal antitrust laws. The cases were consolidated in the Eastern District of Pennsylvania. On January 23, 2019, the court denied MSD’s motions to compel arbitration and to dismiss the consolidated complaint. On February 19, 2019, MSD appealed the court’s order on arbitration to the Third Circuit. On October 28, 2019, the Third Circuit vacated the district court’s order and remanded for limited discovery on the issue of arbitrability, after which MSD may file a renewed motion to compel arbitration.

Sales Force Litigation

As previously disclosed, in May 2013, Ms. Kelli Smith filed a complaint against the Company in the U.S. District Court for the District of New Jersey on behalf of herself and a putative class of female sales representatives and a putative sub-class of female sales representatives with children, claiming (a) discriminatory policies and practices in selection, promotion and advancement, (b) disparate pay, (c) differential treatment, (d) hostile work environment and (e) retaliation under federal and state discrimination laws. In April 2016, the Magistrate Judge granted plaintiffs’ request to amend the complaint to add the following: (i) a Company subsidiary as a corporate defendant; (ii) an ERISA claim and (iii) an individual constructive discharge claim for one of the named plaintiffs. Approximately 700 individuals opted-in to this action; the opt-in period has closed. In August 2017, plaintiffs filed their motion to certify a Title VII pay discrimination class and also sought final collective action certification of plaintiffs’ Equal Pay Act claim.

On October 1, 2018, the parties entered into an agreement to fully resolve the Smith sales force litigation. As part of the settlement and in exchange for a full and general release of all individual and class claims, the Company agreed to pay $8.5 million. On December 3, 2019, the court approved the settlement.

Qui Tam Litigation

As previously disclosed, in June 2012, the U.S. District Court for the Eastern District of Pennsylvania unsealed a complaint that has been filed against the Company under the federal False Claims Act by two former employees alleging, among other things, that the Company defrauded the U.S. government by falsifying data in connection with a clinical study conducted on the mumps component of the Company’s M-M-R II vaccine. The complaint alleges the fraud took place between 1999 and 2001. The U.S. government had the right to participate in and take over the prosecution of this lawsuit but notified the court that it declined to exercise that right. The two former employees are pursuing the lawsuit without the involvement of the U.S. government. In addition, as previously disclosed, two putative class action lawsuits on behalf of direct purchasers of the M‑M‑R II vaccine, which charge that the Company misrepresented the efficacy of the M-M-R II vaccine in violation of federal antitrust laws and various state consumer protection laws, are pending in the Eastern District of Pennsylvania. In September 2014, the court denied Merck’s motion to dismiss the False Claims Act suit and granted in part and denied in part its motion to dismiss the then-pending antitrust suit. As a result, both the False Claims Act suit and the antitrust suits have proceeded into discovery, which is now complete, and the parties have filed and briefed cross-motions for summary judgment, which are currently pending before the Court. The Company continues to defend against these lawsuits.

Merck KGaA Litigation

As previously disclosed, 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), historically 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 UK, Germany, Switzerland, Mexico, India, Australia, Singapore, Hong Kong, and China alleging, among other things, unfair competition, trademark infringement and/or corporate name infringement. In the UK, Australia, Singapore, Hong Kong, and India, KGaA also alleges breach of the parties’ coexistence agreement. The litigation is ongoing in the United States with no trial date set, and also ongoing in numerous jurisdictions outside of the United States; the Company is defending those suits in each jurisdiction.

Patent Litigation

From time to time, generic manufacturers of pharmaceutical products file abbreviated New Drug Applications (NDAs) 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. 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.

Januvia, Janumet, Janumet XR — In February 2019, Par Pharmaceutical filed suit against the Company in the U.S. District Court for the District of New Jersey, seeking a declaratory judgment of invalidity of a patent owned by the Company covering certain salt and polymorphic forms of sitagliptin that expires in 2026. In response, the Company filed a patent infringement lawsuit in the U.S. District Court for the District of Delaware against Par Pharmaceutical and additional companies that also indicated an intent to market generic versions of Januvia, Janumet, and Janumet XR following expiration of key patent protection in 2022, but prior to the expiration of the later-granted patent owned by the Company covering certain salt and polymorphic forms of sitagliptin that expires in 2026, and a later granted patent owned by the Company covering the Janumet formulation which expires in 2028. Par Pharmaceutical dismissed its case in the U.S. District Court for the District of New Jersey against the Company and will litigate the action in the U.S. District Court for the District of Delaware. The Company filed a patent infringement lawsuit against Mylan Pharmaceuticals Inc. and Mylan Inc. (Mylan) in the Northern District of West Virginia. The Judicial Panel of Multidistrict Litigation entered an order transferring the Company’s lawsuit against Mylan to the U.S. District Court for the District of Delaware for coordinated and consolidated pretrial proceedings with the other cases pending in that district. The U.S. District Court for the District of Delaware has scheduled the lawsuits for a single 3-day trial on invalidity issues in October 2021. The Court will schedule separate 1-day trials on infringement issues if necessary. In October 2019, Mylan filed a petition for Inter Partes Review (IPR) at the United States Patent and Trademark Office

(USPTO) seeking invalidity of the 2026 patent. The USPTO has six months from filing to determine whether it will institute the requested IPR proceeding.

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 condition, 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 December 31, 2019 and 2018 of approximately $240 million and $245 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.

Environmental Matters

The Company and its subsidiaries are parties to a number of proceedings brought under the Comprehensive Environmental Response, Compensation and Liability Act, commonly known as Superfund, and other federal and state equivalents. These proceedings seek to require the operators of hazardous waste disposal facilities, transporters of waste to the sites and generators of hazardous waste disposed of at the sites to clean up the sites or to reimburse the government for cleanup costs. The Company has been made a party to these proceedings as an alleged generator of waste disposed of at the sites. In each case, the government alleges that the defendants are jointly and severally liable for the cleanup costs. Although joint and several liability is alleged, these proceedings are frequently resolved so that the allocation of cleanup costs among the parties more nearly reflects the relative contributions of the parties to the site situation. The Company’s potential liability varies greatly from site to site. For some sites the potential liability is de minimis and for others the final costs of cleanup have not yet been determined. While it is not feasible to predict the outcome of many of these proceedings brought by federal or state agencies or private litigants, in the opinion of the Company, such proceedings should not ultimately result in any liability which would have a material adverse effect on the financial condition, results of operations or liquidity of the Company. The Company has taken an active role in identifying and accruing for these costs and such amounts do not include any reduction for anticipated recoveries of cleanup costs from former site owners or operators or other recalcitrant potentially responsible parties.

In management’s opinion, the liabilities for all environmental matters that are probable and reasonably estimable have been accrued and totaled $67 million and $71 million at December 31, 2019 and 2018, respectively. These liabilities are undiscounted, do not consider potential recoveries from other parties and will be paid out over the periods of remediation for the applicable sites, which are expected to occur primarily over the next 15 years. Although it is not possible to predict with certainty the outcome of these matters, or the ultimate costs of remediation, management does not believe that any reasonably possible expenditures that may be incurred in excess of the liabilities accrued should exceed $58 million in the aggregate. Management also does not believe that these expenditures should result in a material adverse effect on the Company’s financial condition, results of operations or liquidity for any year.

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Financial Instruments

12 Months Ended

Dec. 31, 2019

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 changes 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, Japanese yen and Chinese renminbi. 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 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 Consolidated Balance Sheet. Changes in the fair value of derivative contracts are recorded each period in either current earnings or 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 unrealized gains or losses on these contracts is recorded in AOCI and reclassified into Sales when the hedged anticipated revenue is recognized. 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 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 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 also uses forward exchange contracts to hedge a portion of 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 unrealized gains or losses on these contracts are recorded in foreign currency translation adjustment within OCI, and remain in AOCI until either the sale or complete or substantially complete liquidation of the subsidiary. The Company excludes certain portions of the change in fair value of its derivative instruments from the assessment of hedge effectiveness (excluded component). Changes in fair value of the excluded components are recognized in OCI. The Company recognizes in earnings the initial value of the excluded component on a straight-line basis over the life of the derivative instrument, rather than using the mark-to-market approach. The cash flows from these contracts are reported as investing activities in the 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.

The effects of the Company’s net investment hedges on OCI and the Consolidated Statement of Income are shown below:

	Amount of Pretax (Gain) Loss Recognized in Other Comprehensive Income (1)								Amount of Pretax (Gain) Loss Recognized in Other (income) expense, net for Amounts Excluded from Effectiveness Testing
Years Ended December 31	2019			2018			2017		2019			2018			2017
Net Investment Hedging Relationships
Foreign exchange contracts	$	(10	)	$	(18	)	$	—	$	(31	)	$	(11	)	$	—
Euro-denominated notes	(75		)	(183		)	520		—			—			—

⁽¹⁾ No amounts were reclassified from AOCI into income related to the sale of a subsidiary.

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 December 31, 2019, the Company was a party to 19 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.

	2019
Debt Instrument	Par Value of Debt		Number of Interest Rate Swaps Held	Total Swap Notional Amount
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 along with the offsetting fair value changes in the swap contracts. The cash flows from these contracts are reported as operating activities in the Consolidated Statement of Cash Flows.

The table below presents the location of amounts recorded on the Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges as of December 31:

	Carrying Amount of Hedged Liabilities				Cumulative Amount of Fair Value Hedging Adjustment Increase (Decrease) Included in the Carrying Amount
	2019		2018		2019			2018
Balance Sheet Line Item in which Hedged Item is Included
Loans payable and current portion of long-term debt	$	1,249	$	—	$	(1	)	$	—
Long-Term Debt	3,409		4,560		14			(82		)

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 as of December 31:

		2019						2018
		Fair Value of Derivative				U.S. Dollar Notional		Fair Value of Derivative				U.S. Dollar Notional
	Balance Sheet Caption	Asset		Liability				Asset		Liability
Derivatives Designated as Hedging Instruments
Interest rate swap contracts	Other Assets	$	15	$	—	$	3,400	$	—	$	—	$	—
Interest rate swap contracts	Accrued and other current liabilities	—		1		1,250		—		—		—
Interest rate swap contracts	Other Noncurrent Liabilities	—		—		—		—		81		4,650
Foreign exchange contracts	Other current assets	152		—		6,117		263		—		6,222
Foreign exchange contracts	Other Assets	55		—		2,160		75		—		2,655
Foreign exchange contracts	Accrued and other current liabilities	—		22		1,748		—		7		774
Foreign exchange contracts	Other Noncurrent Liabilities	—		1		53		—		1		89
		$	222	$	24	$	14,728	$	338	$	89	$	14,390
Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts	Other current assets	$	66	$	—	$	7,245	$	116	$	—	$	5,430
Foreign exchange contracts	Accrued and other current liabilities	—		73		8,693		—		71		9,922
		$	66	$	73	$	15,938	$	116	$	71	$	15,352
		$	288	$	97	$	30,666	$	454	$	160	$	29,742

As noted above, the Company records its derivatives on a gross basis in the 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 at December 31:

	2019						2018
	Asset			Liability			Asset			Liability
Gross amounts recognized in the consolidated balance sheet	$	288		$	97		$	454		$	160
Gross amounts subject to offset in master netting arrangements not offset in the consolidated balance sheet	(84		)	(84		)	(121		)	(121		)
Cash collateral received	(34		)	—			(107		)	—
Net amounts	$	170		$	13		$	226		$	39

The table below provides information regarding the location and amount of pretax (gains) losses of derivatives designated in fair value or cash flow hedging relationships:

	Sales							Other (income) expense, net (1)							Other comprehensive income (loss)
Years Ended December 31	2019		2018			2017		2019			2018		2017		2019			2018			2017
Financial Statement Line Items in which Effects of Fair Value or Cash Flow Hedges are Recorded	$	46,840	$	42,294		$	40,122	$	139		(402	)	(500	)	$	(648	)	$	(361	)	$	316
(Gain) loss on fair value hedging relationships
Interest rate swap contracts
Hedged items	—		—			—		95			(27	)	(48	)	—			—			—
Derivatives designated as hedging instruments	—		—			—		(65		)	50		12		—			—			—
Impact of cash flow hedging relationships
Foreign exchange contracts
Amount of gain (loss) recognized in OCI on derivatives	—		—			—		—			—		—		87			228			(562		)
(Decrease) increase in Sales as a result of AOCI reclassifications	255		(160		)	138		—			—		—		(255		)	160			(138		)
Interest rate contracts
Amount of gain recognized in Other (income) expense, net on derivatives	—		—			—		(4		)	(4	)	(3	)	—			—			—
Amount of loss recognized in OCI on derivatives	—		—			—		—			—		—		(6		)	(4		)	(3		)

⁽¹⁾ Interest expense is a component of Other (income) expense, net.

The table below provides information regarding the income statement effects of derivatives not designated as hedging instruments:

		Amount of Derivative Pretax (Gain) Loss Recognized in Income
Years Ended December 31	Income Statement Caption	2019		2018			2017
Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts (1)	Other (income) expense, net	$	174	$	(260	)	$	110
Foreign exchange contracts (2)	Sales	1		(8		)	(3		)

⁽¹⁾ 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.

⁽²⁾ These derivative contracts serve as economic hedges of forecasted transactions.

At December 31, 2019, the Company estimates $31 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 at December 31 is as follows:

	2019								2018
	Amortized Cost		Gross Unrealized				Fair Value		Amortized Cost		Gross Unrealized					Fair Value
			Gains		Losses						Gains		Losses
Commercial paper	$	668	$	—	$	—	$	668	$	—	$	—	$	—		$	—
Corporate notes and bonds	608		13		—		621		4,985		3		(68		)	4,920
U.S. government and agency securities	266		3		—		269		895		2		(5		)	892
Asset-backed securities	226		1		—		227		1,285		1		(11		)	1,275
Foreign government bonds	—		—		—		—		167		—		(1		)	166
Mortgage-backed securities	—		—		—		—		8		—		—			8
Total debt securities	1,768		17		—		1,785		7,340		6		(85		)	7,261
Publicly traded equity securities (1)							838									456
Total debt and publicly traded equity securities							$	2,623								$	7,717

⁽¹⁾ Unrealized net gains recognized in Other (income) expense, net on equity securities still held at December 31, 2019 were $160 million during 2019. Unrealized net losses recognized in Other (income) expense, net on equity securities still held at December 31, 2018 were $35 million during 2018.

At December 31, 2019 and 2018, the Company also had $420 million and $568 million, respectively, of equity investments without readily determinable fair values included in Other Assets. During 2019 and 2018, the Company recognized unrealized gains of $20 million and $167 million, respectively, in Other (income) expense, net, on certain of these equity investments based on favorable observable price changes from transactions involving similar investments of the same investee. In addition, during 2019 and 2018, the Company recognized unrealized losses of $13 million and $26 million, respectively, in Other (income) expense, net, related to certain of these investments based on unfavorable observable price changes. Cumulative unrealized gains and cumulative unrealized losses based on observable prices changes for investments in equity investments without readily determinable fair values were $109 million and $21 million, respectively.

Available-for-sale debt securities included in Short-term investments totaled $749 million at December 31, 2019. Of the remaining debt securities, $933 million mature within five years. At December 31, 2019 and 2018, 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 at December 31 are summarized below:

	Fair Value Measurements Using								Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	2019								2018
Assets
Investments
Commercial paper	$	—	$	668	$	—	$	668	$	—	$	—	$	—	$	—
Corporate notes and bonds	—		621		—		621		—		4,835		—		4,835
Asset-backed securities (1)	—		227		—		227		—		1,253		—		1,253
U.S. government and agency securities	—		209		—		209		—		731		—		731
Foreign government bonds	—		—		—		—		—		166		—		166
Publicly traded equity securities	518		—		—		518		147		—		—		147
	518		1,725		—		2,243		147		6,985		—		7,132
Other assets (2)
U.S. government and agency securities	60		—		—		60		55		106		—		161
Corporate notes and bonds	—		—		—		—		—		85		—		85
Asset-backed securities (1)	—		—		—		—		—		22		—		22
Mortgage-backed securities	—		—		—		—		—		8		—		8
Publicly traded equity securities	320		—		—		320		309		—		—		309
	380		—		—		380		364		221		—		585
Derivative assets (3)
Forward exchange contracts	—		169		—		169		—		241		—		241
Purchased currency options	—		104		—		104		—		213		—		213
Interest rate swaps	—		15		—		15		—		—		—		—
	—		288		—		288		—		454		—		454
Total assets	$	898	$	2,013	$	—	$	2,911	$	511	$	7,660	$	—	$	8,171
Liabilities
Other liabilities
Contingent consideration	$	—	$	—	$	767	$	767	$	—	$	—	$	788	$	788
Derivative liabilities (3)
Forward exchange contracts	—		95		—		95		—		74		—		74
Interest rate swaps	—		1		—		1		—		81		—		81
Written currency options	—		1		—		1		—		5		—		5
	—		97		—		97		—		160		—		160
Total liabilities	$	—	$	97	$	767	$	864	$	—	$	160	$	788	$	948

⁽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.

⁽²⁾  Investments included in other assets are restricted as to use, including for the payment of benefits under employee benefit plans.

⁽³⁾  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.

As of December 31, 2019, Cash and cash equivalents of $9.7 billion include $8.9 billion of cash equivalents (which would be considered Level 2 in the fair value hierarchy).

Contingent Consideration

Summarized information about the changes in liabilities for contingent consideration associated with business acquisitions is as follows:

	2019			2018
Fair value January 1	$	788		$	935
Changes in estimated fair value (1)	64			89
Additions	—			8
Payments	(85		)	(244		)
Fair value December 31 (2)(3)	$	767		$	788

⁽¹⁾ Recorded in Cost of sales, Research and development expenses, and Other (income) expense, net. Includes cumulative translation adjustments.

⁽²⁾ Balance at December 31, 2019 includes $114 million recorded as a current liability for amounts expected to be paid within the next 12 months.

⁽³⁾ At December 31, 2019 and 2018, $625 million and $614 million, respectively, of the liabilities relate to the termination of the SPMSD joint venture in 2016. As part of the termination, Merck recorded a liability for contingent future royalty payments of 11.5% on net sales of all Merck products that were previously sold by the joint venture through December 31, 2024. The fair value of this liability is determined utilizing the estimated amount and timing of projected cash flows and a risk-adjusted discount rate of 8% is used to present value the cash flows.

The changes in the estimated fair value of liabilities for contingent consideration in 2019 and 2018 were largely attributable to increases in the liabilities recorded in connection with the termination of the Sanofi Pasteur MSD (SPMSD) joint venture in 2016. In 2018, these increases were partially offset by the reversal of a liability related to the discontinuation of a program obtained in connection with the acquisition of SmartCells (see Note 8). The payments of contingent consideration in both years relate to the SPMSD termination liabilities described above. The payments of contingent consideration in 2018 also include $175 million related to the achievement of a clinical development milestone for MK-7264 (gefapixant), a program obtained in connection with the acquisition of Afferent Pharmaceuticals.

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 December 31, 2019, was $28.8 billion compared with a carrying value of $26.3 billion and at December 31, 2018, was $25.6 billion compared with a carrying value of $25.1 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, Europe and China 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 global economic conditions, including the volatility associated with international sovereign economies, and associated impacts on the financial markets and its business. 

The Company’s customers with the largest accounts receivable balances are: McKesson Corporation, AmerisourceBergen Corporation and Cardinal Health, Inc., which represented, in aggregate, approximately 35% of total accounts receivable at December 31, 2019. The Company monitors the creditworthiness of its customers to which it grants credit terms in the normal course of business. Bad debts have been minimal. The Company does not normally require collateral or other security to support credit sales.

The Company has accounts receivable factoring agreements with financial institutions in certain countries to sell accounts receivable. In 2019, the Company expanded its factoring arrangements in China and entered into factoring agreements to sell accounts receivable from the Company’s major U.S. distributors. The Company factored

$2.7 billion and $1.1 billion of accounts receivable in the fourth quarter of 2019 and 2018, respectively, under these factoring arrangements, which reduced outstanding accounts receivable. The cash received from the financial institutions is reported within operating activities in the Consolidated Statement of Cash Flows. In certain of these factoring arrangements, for ease of administration, the Company will collect customer payments related to the factored receivables, which it then remits to the financial institutions. At December 31, 2019, the Company had collected $256 million on behalf of the financial institutions, which is reflected as restricted cash in Other current assets and the related obligation to remit the cash within Accrued and other current liabilities. The Company remitted the cash to the financial institutions in January 2020. The net cash flows relating to these collections are reported as financing activities in the Consolidated Statement of Cash Flows. The costs of factoring such accounts receivable were de minimis.

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. Cash collateral received by the Company from various counterparties was $34 million and $107 million at December 31, 2019 and 2018, respectively. The obligation to return such collateral is recorded in Accrued and other current liabilities. No cash collateral was advanced by the Company to counterparties as of December 31, 2019 or 2018.

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Summary of Accounting Policies

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Summary of Accounting Policies

Summary of Accounting Policies

Principles of Consolidation — The consolidated financial statements include the accounts of the Company and all of its subsidiaries in which a controlling interest is maintained. Intercompany balances and transactions are eliminated. Controlling interest is determined by majority ownership interest and the absence of substantive third-party participating rights or, in the case of variable interest entities, by majority exposure to expected losses, residual returns or both. For those consolidated subsidiaries where Merck ownership is less than 100%, the outside shareholders’ interests are shown as Noncontrolling interests in equity. Investments in affiliates over which the Company has significant influence but not a controlling interest, such as interests in entities owned equally by the Company and a third party that are under shared control, are carried on the equity basis.

Acquisitions — In a business combination, the acquisition method of accounting requires that the assets acquired and liabilities assumed be recorded as of the date of the acquisition at their respective fair values with limited exceptions. Assets acquired and liabilities assumed in a business combination that arise from contingencies are generally recognized at fair value. If fair value cannot be determined, the asset or liability is recognized if probable and reasonably estimable; if these criteria are not met, no asset or liability is recognized. 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. Accordingly, the Company may be required to value assets at fair value measures that do not reflect the Company’s intended use of those assets. Any excess of the purchase price (consideration transferred) over the estimated fair values of net assets acquired is recorded as goodwill. Transaction costs and costs to restructure the acquired company are expensed as incurred. The operating results of the acquired business are reflected in the Company’s consolidated financial statements after the date of the acquisition. If the Company determines the assets acquired do not meet the definition of a business under the acquisition method of accounting, the transaction will be accounted for as an acquisition of assets rather than a business combination and, therefore, no goodwill will be recorded. In an asset acquisition, acquired in-process research and development (IPR&D) with no alternative future use is charged to expense and contingent consideration is not recognized at the acquisition date.

Foreign Currency Translation — The net assets of international subsidiaries where the local currencies have been determined to be the functional currencies are translated into U.S. dollars using current exchange rates. The U.S. dollar effects that arise from translating the net assets of these subsidiaries at changing rates are recorded in the foreign currency translation account, which is included in Accumulated other comprehensive income (loss) (AOCI) and reflected as a separate component of equity. For those subsidiaries that operate in highly inflationary economies and for those subsidiaries where the U.S. dollar has been determined to be the functional currency, non-monetary foreign currency assets and liabilities are translated using historical rates, while monetary assets and liabilities are translated at current rates, with the U.S. dollar effects of rate changes included in Other (income) expense, net.

Cash Equivalents — Cash equivalents are comprised of certain highly liquid investments with original maturities of less than three months.

Inventories — Inventories are valued at the lower of cost or net realizable value. The cost of a substantial majority of U.S. pharmaceutical and vaccine inventories is determined using the last-in, first-out (LIFO) method for both financial reporting and tax purposes. The cost of all other inventories is determined using the first-in, first-out (FIFO) method. Inventories consist of currently marketed products, as well as certain inventories produced in preparation for product launches that are considered to have a high probability of regulatory approval. In evaluating the recoverability of inventories produced in preparation for product launches, the Company considers the likelihood that revenue will be obtained from the future sale of the related inventory together with the status of the product within the regulatory approval process.

Investments — Investments in marketable debt securities classified as available-for-sale are reported at fair value. Fair values of the Company’s investments in marketable debt securities are determined using quoted market prices in active markets for identical assets or liabilities or 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. Changes in fair value that are considered temporary are reported net of tax in Other Comprehensive Income (OCI). The Company considers available evidence in evaluating potential impairments of its investments in marketable debt securities, including the duration and extent to which fair value is less than cost. An other-than-temporary impairment has occurred if the Company does not expect to recover the entire amortized cost basis of the marketable debt security. If the Company does not intend to sell the impaired debt security, and it is not more likely than not it will be required to sell the debt security before the recovery of its amortized cost basis, the amount of the other-than-temporary impairment recognized in earnings, recorded in Other (income) expense, net, is limited to the portion attributed to credit loss. The remaining portion of the other-than-temporary impairment related to other factors is recognized in OCI. Realized gains and losses for debt securities are included in Other (income) expense, net.

Investments in publicly traded equity securities are reported at fair value determined using quoted market prices in active markets for identical assets or quoted prices for similar assets or other inputs that are observable or can be corroborated by observable market data. Changes in fair value are included in Other (income) expense, net.

Investments in equity securities without readily determinable fair values are recorded at cost, plus or minus subsequent observable price changes in orderly transactions for identical or similar investments, minus impairments. Such adjustments are recognized in Other (income) expense, net. Realized gains and losses for equity securities are included in Other (income) expense, net.

Revenue Recognition — On January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers, and subsequent amendments (ASC 606 or new guidance), using the modified retrospective method. Comparative information for prior periods has not been restated and continues to be reported under the accounting standards in effect for those periods.

Recognition of revenue requires evidence of a contract, probable collection of sales proceeds and completion of substantially all performance obligations. Merck acts as the principal in substantially all of its customer arrangements and therefore records revenue on a gross basis. The majority of the Company’s contracts related to the Pharmaceutical and Animal Health segments have a single performance obligation - the promise to transfer goods. Shipping is considered immaterial in the context of the overall customer arrangement and damages or loss of goods in transit are rare. Therefore, shipping is not deemed a separately recognized performance obligation.

The vast majority of revenues from sales of products are recognized at a point in time when control of the goods is transferred to the customer, which the Company has determined is when title and risks and rewards of ownership transfer to the customer and the Company is entitled to payment. The Company recognizes revenue from the sales of vaccines to the Federal government for placement into vaccine stockpiles in accordance with Securities and Exchange Commission (SEC) Interpretation, Commission Guidance Regarding Accounting for Sales of Vaccines and BioTerror Countermeasures to the Federal Government for Placement into the Pediatric Vaccine Stockpile or the Strategic National Stockpile. This interpretation allows companies to recognize revenue for sales of vaccines into U.S. government stockpiles even though these sales might not meet the criteria for revenue recognition under other accounting guidance. For businesses within the Company’s Healthcare Services segment and certain services in the Animal Health segment, revenue is recognized over time, generally ratably over the contract term as services are provided. These service revenues are not material.

The nature of the Company’s business gives rise to several types of variable consideration including discounts and returns, which are estimated at the time of sale generally using the expected value method, although the most likely amount method is used for prompt pay discounts.

In the United States, sales discounts are issued to customers at the point-of-sale, through an intermediary wholesaler (known as chargebacks), or in the form of rebates. Additionally, sales are generally made with a limited right of return under certain conditions. Revenues are recorded net of provisions for sales discounts and returns, which are established at the time of sale. In addition, revenues are recorded net of time value of money discounts if collection of accounts receivable is expected to be in excess of one year.

The U.S. provision for aggregate customer discounts covering chargebacks and rebates was $11.8 billion in 2019, $10.7 billion in 2018 and $10.7 billion in 2017. Chargebacks are discounts that occur when a contracted customer purchases through an intermediary wholesaler. The contracted customer generally purchases product from the wholesaler at its contracted price plus a mark-up. The wholesaler, in turn, charges the Company back for the difference between the price initially paid by the wholesaler and the contract price paid to the wholesaler by the customer. The provision for chargebacks is based on expected sell-through levels by the Company’s wholesale customers to contracted customers, as well as estimated wholesaler inventory levels. Rebates are amounts 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. The provision for rebates is based on expected patient usage, as well as inventory levels in the distribution channel to determine the contractual obligation to the benefit providers. The Company uses historical customer segment utilization mix, sales forecasts, changes to product mix and price, inventory levels in the distribution channel, government pricing calculations and prior payment history in order to estimate the expected provision. Amounts accrued for aggregate customer discounts are evaluated on a quarterly basis through comparison of information provided by the wholesalers, health maintenance organizations, pharmacy benefit managers, federal and state agencies, and other customers to the amounts accrued. The accrued balances relative to the provisions for chargebacks and rebates included in Accounts

receivable and Accrued and other current liabilities were $233 million and $2.2 billion, respectively, at December 31, 2019 and were $245 million and $2.4 billion, respectively, at December 31, 2018.

Outside of the United States, variable consideration in the form of discounts and rebates are a combination of commercially-driven discounts in highly competitive product classes, discounts required to gain or maintain reimbursement, or legislatively mandated rebates. In certain European countries, legislatively mandated rebates are calculated based on an estimate of the government’s total unbudgeted spending and the Company’s specific payback obligation. Rebates may also be required based on specific product sales thresholds. The Company applies an estimated factor against its actual invoiced sales to represent the expected level of future discount or rebate obligations associated with the sale.

The Company maintains a returns policy that allows its U.S. pharmaceutical customers to return product within a specified period prior to and subsequent to the expiration date (generally, three to six months before and 12 months after product expiration). The estimate of the provision for returns is based upon historical experience with actual returns. Additionally, the Company considers factors such as levels of inventory in the distribution channel, product dating and expiration period, whether products have been discontinued, entrance in the market of generic competition, changes in formularies or launch of over-the-counter products, among others. Outside of the United States, returns are only allowed in certain countries on a limited basis.

Merck’s payment terms for U.S. pharmaceutical customers are typically 36 days from receipt of invoice and for U.S. animal health customers are typically 30 days from receipt of invoice; however, certain products, including Keytruda, have longer payment terms up to 90 days. Outside of the United States, payment terms are typically 30 days to 90 days, although certain markets have longer payment terms.

Depreciation — Depreciation is provided over the estimated useful lives of the assets, principally using the straight-line method. For tax purposes, accelerated tax methods are used. The estimated useful lives primarily range from 25 to 45 years for Buildings, and from 3 to 15 years for Machinery, equipment and office furnishings. Depreciation expense was $1.7 billion in 2019, $1.4 billion in 2018 and $1.5 billion in 2017.

Advertising and Promotion Costs — Advertising and promotion costs are expensed as incurred. The Company recorded advertising and promotion expenses of $2.1 billion, $2.1 billion and $2.2 billion in 2019, 2018 and 2017, respectively.

Software Capitalization — The Company capitalizes certain costs incurred in connection with obtaining or developing internal-use software including external direct costs of material and services, and payroll costs for employees directly involved with the software development. These costs are included in Property, plant and equipment. In addition, the Company capitalizes certain costs incurred to implement a cloud computing arrangement that is considered a service agreement, which are included in Other Assets. Capitalized software costs are amortized beginning when the software project is substantially complete and the asset is ready for its intended use. Capitalized software costs associated with projects that are being amortized over 6 to 10 years (including the Company’s on-going multi-year implementation of an enterprise-wide resource planning system) were $548 million and $439 million, net of accumulated amortization at December 31, 2019 and 2018, respectively. All other capitalized software costs are being amortized over periods ranging from 3 to 5 years. Costs incurred during the preliminary project stage and post-implementation stage, as well as maintenance and training costs, are expensed as incurred.

Goodwill — Goodwill represents the excess of the consideration transferred over the fair value of net assets of businesses acquired. Goodwill is assigned to reporting units and evaluated for impairment on at least an annual basis, or more frequently if impairment indicators exist, by first assessing qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the Company concludes it is more likely than not that the fair value of a reporting unit is less than its carrying amount, a quantitative fair value test is performed. If the carrying value of a reporting unit is greater than its fair value, a goodwill impairment charge will be recorded for the difference (up to the carrying value of goodwill).

Acquired Intangibles — Acquired intangibles include products and product rights, licenses, trade names and patents, which are initially recorded at fair value, assigned an estimated useful life, and amortized primarily on a straight-line basis over their estimated useful lives ranging from 2 to 24 years (see Note 8). The Company periodically evaluates whether current facts or circumstances indicate that the carrying values of its acquired intangibles may not

be recoverable. If such circumstances are determined to exist, an estimate of the undiscounted future cash flows of these assets, or appropriate asset groupings, is compared to the carrying value to determine whether an impairment exists. If the asset is determined to be impaired, the loss is measured based on the difference between the carrying value of the intangible asset and its fair value, which is determined based on the net present value of estimated future cash flows.

Acquired In-Process Research and Development — IPR&D that the Company acquires in conjunction with the acquisition of a business represents the fair value assigned to incomplete research projects which, at the time of acquisition, have not reached technological feasibility. The amounts are capitalized and are accounted for as indefinite-lived intangible assets, subject to impairment testing until completion or abandonment of the projects. Upon successful completion of each project, Merck will make a determination as to the then-useful life of the intangible asset, generally determined by the period in which the substantial majority of the cash flows are expected to be generated, and begin amortization. The Company evaluates IPR&D for impairment at least annually, or more frequently if impairment indicators exist, by performing a quantitative test that compares the fair value of the IPR&D intangible asset with its carrying value. If the fair value is less than the carrying amount, an impairment loss is recognized in operating results.

Contingent Consideration — Certain of the Company’s acquisitions involve the potential for future payment of consideration that is contingent upon the achievement of performance milestones, including product development milestones and royalty payments on future product sales. If the transaction is accounted for as an acquisition of a business, the fair value of contingent consideration liabilities is determined at the acquisition date using unobservable inputs. These inputs include the estimated amount and timing of projected cash flows, the probability of success (achievement of the contingent event) and the risk-adjusted discount rate used to present value the probability-weighted cash flows. Subsequent to the acquisition date, at each reporting period until the contingency is resolved, the contingent consideration liability is remeasured at current fair value with changes (either expense or income) recorded in earnings. Significant events that increase or decrease the probability of achieving development and regulatory milestones or that increase or decrease projected cash flows will result in corresponding increases or decreases in the fair values of the related contingent consideration obligations. If the transaction is accounted for as an acquisition of an asset rather than a business, contingent consideration is not recognized at the acquisition date. In these instances, product development milestones are recognized upon achievement and sales-based milestones are recognized when the milestone is deemed probable by the Company of being achieved.

Research and Development — Research and development is expensed as incurred. Nonrefundable advance payments for goods and services that will be used in future research and development activities are expensed when the activity has been performed or when the goods have been received rather than when the payment is made. Research and development expenses include restructuring costs and IPR&D impairment charges. In addition, research and development expenses include expense or income related to changes in the estimated fair value measurement of liabilities for contingent consideration. Research and development expenses also include upfront and milestone payments related to asset acquisitions and licensing transactions involving clinical development programs that have not yet received regulatory approval.

Collaborative Arrangements — Merck has entered into collaborative arrangements that provide the Company with varying rights to develop, produce and market products together with its collaborative partners. When Merck is the principal on sales transactions with third parties, the Company recognizes sales, cost of sales and selling, general and administrative expenses on a gross basis. Profit sharing amounts it pays to its collaborative partners are recorded within Cost of sales. When the collaborative partner is the principal on sales transactions with third parties, the Company records profit sharing amounts received from its collaborative partners as alliance revenue (within Sales). Alliance revenue is recorded net of cost of sales and includes an adjustment to share commercialization costs between the partners in accordance with the collaboration agreement. The adjustment is determined by comparing the commercialization costs Merck has incurred directly and reported within Selling, general and administrative expenses with the costs the collaborative partner has incurred. Research and development costs Merck incurs related to collaborations are recorded within Research and development expenses. Cost reimbursements to the collaborative partner or payments received from the collaborative partner to share these costs pursuant to the terms of the collaboration agreements are recorded as increases or decreases to Research and development expenses.

In addition, the terms of the collaboration agreements may require the Company to make payments based upon the achievement of certain developmental, regulatory approval or commercial milestones. Upfront and milestone payments payable by Merck to collaborative partners prior to regulatory approval are expensed as incurred and included in Research and development expenses. Payments due to collaborative partners upon or subsequent to regulatory approval are capitalized and amortized over the estimated useful life of the corresponding intangible asset to Cost of sales provided that future cash flows support the amounts capitalized. Sales-based milestones payable by Merck to collaborative partners are accrued and capitalized, subject to cumulative amortization catch-up, when probable of being achieved. The amortization catch-up is calculated either from the time of the first regulatory approval for indications that were unapproved at the time the collaboration was formed, or from time of the formation of the collaboration for approved products. The related intangible asset that is recognized is amortized to Cost of sales over its remaining useful life, subject to impairment testing.

Share-Based Compensation — The Company expenses all share-based payments to employees over the requisite service period based on the grant-date fair value of the awards.

Restructuring Costs — The Company records liabilities for costs associated with exit or disposal activities in the period in which the liability is incurred. In accordance with existing benefit arrangements, employee termination costs are accrued when the restructuring actions are probable and estimable. When accruing these costs, the Company will recognize the amount within a range of costs that is the best estimate within the range. When no amount within the range is a better estimate than any other amount, the Company recognizes the minimum amount within the range. Costs for one-time termination benefits in which the employee is required to render service until termination in order to receive the benefits are recognized ratably over the future service period.

Contingencies and Legal Defense Costs — The Company records accruals for contingencies and legal defense costs expected to be incurred in connection with a loss contingency when it is probable that a liability has been incurred and the amount can be reasonably estimated.

Taxes on Income — Deferred taxes are recognized for the future tax effects of temporary differences between financial and income tax reporting based on enacted tax laws and rates. The Company evaluates tax positions to determine whether the benefits of tax positions are more likely than not of being sustained upon audit based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained upon audit, the Company recognizes the largest amount of the benefit that is greater than 50% likely of being realized upon ultimate settlement in the financial statements. For tax positions that are not more likely than not of being sustained upon audit, the Company does not recognize any portion of the benefit in the financial statements. The Company recognizes interest and penalties associated with uncertain tax positions as a component of Taxes on income in the Consolidated Statement of Income. The Company accounts for the tax effects of the tax on global intangible low-taxed income (GILTI) of certain foreign subsidiaries in the income tax provision in the period the tax arises.

Use of Estimates — The consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States (GAAP) and, accordingly, include certain amounts that are based on management’s best estimates and judgments. Estimates are used when accounting for amounts recorded in connection with acquisitions, including initial fair value determinations of assets and liabilities, primarily IPR&D, other intangible assets and contingent consideration, as well as subsequent fair value measurements. Additionally, estimates are used in determining such items as provisions for sales discounts and returns, depreciable and amortizable lives, recoverability of inventories, including those produced in preparation for product launches, amounts recorded for contingencies, environmental liabilities, accruals for contingent sales-based milestone payments and other reserves, pension and other postretirement benefit plan assumptions, share-based compensation assumptions, restructuring costs, impairments of long-lived assets (including intangible assets and goodwill) and investments, and taxes on income. Because of the uncertainty inherent in such estimates, actual results may differ from these estimates.

Reclassifications — Certain reclassifications have been made to prior year amounts to conform to the current year presentation.

Recently Adopted Accounting Standards — In February 2016, the Financial Accounting Standards Board (FASB) issued new accounting guidance for the accounting and reporting of leases (ASU 2016-02) and subsequently issued several updates to the new guidance (ASC 842 or new leasing guidance). The new leasing guidance requires

that lessees recognize a right-of-use asset and a lease liability for each of its leases (other than leases that meet the definition of a short-term lease). Leases are classified as either operating or finance. Operating leases result in straight-line expense in the income statement (similar to previous operating leases), while finance leases result in more expense being recognized in the earlier years of the lease term (similar to previous capital leases). The Company adopted the new standard on January 1, 2019 using a modified retrospective approach. Merck elected the transition method that allows for application of the standard at the adoption date rather than at the beginning of the earliest comparative period presented in the financial statements. The Company also elected available practical expedients. Upon adoption, the Company recognized $1.1 billion of additional assets and related liabilities on its consolidated balance sheet (see Note 9). The adoption of the new leasing guidance did not impact the Company’s consolidated statements of income or of cash flows.

In April 2018, the FASB issued new guidance on the accounting for costs incurred to implement a cloud computing arrangement that is considered a service arrangement. The new guidance requires the capitalization of such costs, aligning it with the accounting for costs associated with developing or obtaining internal-use software. The Company adopted the new standard in the third quarter of 2019 using prospective application for eligible costs, which were immaterial.

In August 2018, the FASB issued new guidance modifying the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The new guidance removes disclosures that no longer are considered cost beneficial, clarifies the specific requirements of certain disclosures, and adds disclosure requirements identified as relevant. The Company elected to early adopt the new guidance in 2019 on a retrospective basis resulting in minor changes to its employee benefit plan disclosures (see Note 13).

Also, in August 2018, the FASB issued new guidance on fair value measurements that adds, removes, and modifies certain disclosure requirements. The Company elected to early adopt the new guidance in 2019 resulting in minor changes to its fair value disclosures (see Note 6).

Recently Issued Accounting Standards Not Yet Adopted — In June 2016, the FASB issued new guidance on the accounting for credit losses on financial instruments. The new 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 Company adopted the new guidance effective January 1, 2020. There was no impact to the Company’s consolidated financial statements upon adoption.

In November 2018, the FASB issued new guidance for collaborative arrangements intended to reduce diversity in practice by clarifying whether certain transactions between collaborative arrangement participants should be accounted for under revenue recognition guidance (ASC 606). The Company adopted the new guidance effective January 1, 2020, which will result in minor changes to the footnote presentation of information related to the Company’s collaborative arrangements.

In December 2019, the FASB issued amended guidance on the accounting and reporting of income taxes. The guidance is intended to simplify the accounting for income taxes by removing exceptions related to certain intraperiod tax allocations and deferred tax liabilities; clarifying guidance primarily related to evaluating the step-up tax basis for goodwill in a business combination; and reflecting enacted changes in tax laws or rates in the annual effective tax rate. The amended guidance is effective for interim and annual periods in 2021. Early adoption is permitted. The application of the amendments in the new guidance are to be applied on a retrospective basis, on a modified retrospective basis through a cumulative-effect adjustment to retained earnings or prospectively, depending on the amendment. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

In January 2020, the FASB issued new guidance intended to clarify certain interactions between accounting standards related to equity securities, equity method investments and certain derivatives. The guidance addresses accounting for the transition into and out of the equity method of accounting and measuring certain purchased options and forward contracts to acquire investments. The new guidance is effective for interim and annual periods in 2021 and is to be applied prospectively. Early adoption is permitted. The Company is currently evaluating the impact of adoption on its consolidated financial statements.

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Consolidated Statement of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Common stock, dividends declared (in dollars per share)	$ 2.26	$ 1.99	$ 1.89

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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ 26,882	$ 34,569	$ 40,308
Other comprehensive income (loss) before reclassification adjustments, pretax	(610)	(692)	324
Tax	161	(24)	232
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(449)	(716)	556
Reclassification adjustments, pretax	(239)	424	(315)
Tax	40	(69)	75
Reclassification adjustments, net of taxes	(199)	355	(240)
Other comprehensive income (loss), net of taxes	(648)	(361)	316
Adoption of ASU 2018-02		(266)
Adoption of new accounting standards			48
Ending Balance	26,001	26,882	34,569
Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	166	(108)	338
Other comprehensive income (loss) before reclassification adjustments, pretax	86	228	(561)
Tax	(15)	(55)	207
Other comprehensive income (loss) before reclassification adjustments, net of taxes	71	173	(354)
Reclassification adjustments, pretax	(261)	157	(141)
Tax	55	(33)	49
Reclassification adjustments, net of taxes	(206)	124	(92)
Other comprehensive income (loss), net of taxes	(135)	297	(446)
Adoption of ASU 2018-02		(23)
Adoption of new accounting standards				$ 0
Ending Balance	31	166	(108)
Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(78)	(61)	(3)
Other comprehensive income (loss) before reclassification adjustments, pretax	140	(108)	212
Tax	0	1	(35)
Other comprehensive income (loss) before reclassification adjustments, net of taxes	140	(107)	177
Reclassification adjustments, pretax	(44)	97	(291)
Tax	0	0	56
Reclassification adjustments, net of taxes	(44)	97	(235)
Other comprehensive income (loss), net of taxes	96	(10)	(58)
Adoption of ASU 2018-02		1
Adoption of new accounting standards				(8)
Ending Balance	18	(78)	(61)
Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(3,556)	(2,787)	(3,206)
Other comprehensive income (loss) before reclassification adjustments, pretax	(948)	(728)	438
Tax	192	169	(106)
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(756)	(559)	332
Reclassification adjustments, pretax	66	170	117
Tax	(15)	(36)	(30)
Reclassification adjustments, net of taxes	51	134	87
Other comprehensive income (loss), net of taxes	(705)	(425)	419
Adoption of ASU 2018-02		(344)
Adoption of new accounting standards				0
Ending Balance	(4,261)	(3,556)	(2,787)
Pension Plan Net Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI	5,100	4,400
Other Postretirement Benefit Plan Net Gain
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI	(247)	(170)
Pension Plan Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI	(263)	(314)
Other Postretirement Benefit Plan Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI	(305)	(375)
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(2,077)	(1,954)	(2,355)
Other comprehensive income (loss) before reclassification adjustments, pretax	112	(84)	235
Tax	(16)	(139)	166
Other comprehensive income (loss) before reclassification adjustments, net of taxes	96	(223)	401
Reclassification adjustments, pretax	0	0	0
Tax	0	0	0
Reclassification adjustments, net of taxes	0	0	0
Other comprehensive income (loss), net of taxes	96	(223)	401
Adoption of ASU 2018-02		100
Adoption of new accounting standards				0
Ending Balance	(1,981)	(2,077)	(1,954)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(5,545)	(4,910)	(5,226)
Adoption of new accounting standards			(274)	$ (8)
Ending Balance	$ (6,193)	$ (5,545)	$ (4,910)

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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 9,843	$ 6,220	$ 2,394
Other Comprehensive (Loss) Income Net of Taxes:
Net unrealized (loss) gain on derivatives, net of reclassifications	(135)	297
Net unrealized (loss) gain on derivatives, net of reclassifications			(446)
Net unrealized gain (loss) on investments, net of reclassifications	96	(10)	(58)
Benefit plan net (loss) gain and prior service (cost) credit, net of amortization	(705)	(425)	419
Cumulative translation adjustment	96	(223)	401
Other comprehensive income (loss), net of taxes	(648)	(361)	316
Comprehensive Income Attributable to Merck & Co., Inc.	$ 9,195	$ 5,859	$ 2,710

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Taxes on Income - Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Tax [Line Items]
Product intangibles and licenses, Assets	$ 442	$ 720
Inventory related, Assets	32	32
Accelerated depreciation, Assets	0	0
Pensions and other postretirement benefits, Assets	785	565
Compensation related, Assets	322	291
Unrecognized tax benefits, Assets	109	174
Net operating losses and other tax credit carryforwards, Assets	897	715
Other, Assets	764	621
Subtotal, Assets	3,351	3,118
Valuation allowance, Assets	(1,100)	(1,348)
Deferred Tax Assets	2,251	1,770
Product intangibles and licenses, Liabilities	1,778	1,640
Inventory related, Liabilities	354	377
Accelerated depreciation, Liabilities	594	582
Pensions and other postretirement benefits, Liabilities	191	151
Other, Liabilities	84	66
Subtotal, Liabilities	3,001	2,816
Deferred income taxes, Liabilities	750	1,046
Deferred income taxes	1,470	1,702
Other Assets
Income Tax [Line Items]
Deferred Tax Assets	$ 719	$ 656

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Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Effect of Net Investment Hedges

The effects of the Company’s net investment hedges on OCI and the Consolidated Statement of Income are shown below:

	Amount of Pretax (Gain) Loss Recognized in Other Comprehensive Income (1)								Amount of Pretax (Gain) Loss Recognized in Other (income) expense, net for Amounts Excluded from Effectiveness Testing
Years Ended December 31	2019			2018			2017		2019			2018			2017
Net Investment Hedging Relationships
Foreign exchange contracts	$	(10	)	$	(18	)	$	—	$	(31	)	$	(11	)	$	—
Euro-denominated notes	(75		)	(183		)	520		—			—			—

⁽¹⁾ No amounts were reclassified from AOCI into income related to the sale of a subsidiary.

Summary of Interest Rate Derivatives

At December 31, 2019, the Company was a party to 19 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.

	2019
Debt Instrument	Par Value of Debt		Number of Interest Rate Swaps Held	Total Swap Notional Amount
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

Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position

The table below presents the location of amounts recorded on the Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges as of December 31:

	Carrying Amount of Hedged Liabilities				Cumulative Amount of Fair Value Hedging Adjustment Increase (Decrease) Included in the Carrying Amount
	2019		2018		2019			2018
Balance Sheet Line Item in which Hedged Item is Included
Loans payable and current portion of long-term debt	$	1,249	$	—	$	(1	)	$	—
Long-Term Debt	3,409		4,560		14			(82		)

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 as of December 31:

		2019						2018
		Fair Value of Derivative				U.S. Dollar Notional		Fair Value of Derivative				U.S. Dollar Notional
	Balance Sheet Caption	Asset		Liability				Asset		Liability
Derivatives Designated as Hedging Instruments
Interest rate swap contracts	Other Assets	$	15	$	—	$	3,400	$	—	$	—	$	—
Interest rate swap contracts	Accrued and other current liabilities	—		1		1,250		—		—		—
Interest rate swap contracts	Other Noncurrent Liabilities	—		—		—		—		81		4,650
Foreign exchange contracts	Other current assets	152		—		6,117		263		—		6,222
Foreign exchange contracts	Other Assets	55		—		2,160		75		—		2,655
Foreign exchange contracts	Accrued and other current liabilities	—		22		1,748		—		7		774
Foreign exchange contracts	Other Noncurrent Liabilities	—		1		53		—		1		89
		$	222	$	24	$	14,728	$	338	$	89	$	14,390
Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts	Other current assets	$	66	$	—	$	7,245	$	116	$	—	$	5,430
Foreign exchange contracts	Accrued and other current liabilities	—		73		8,693		—		71		9,922
		$	66	$	73	$	15,938	$	116	$	71	$	15,352
		$	288	$	97	$	30,666	$	454	$	160	$	29,742

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 at December 31:

	2019						2018
	Asset			Liability			Asset			Liability
Gross amounts recognized in the consolidated balance sheet	$	288		$	97		$	454		$	160
Gross amounts subject to offset in master netting arrangements not offset in the consolidated balance sheet	(84		)	(84		)	(121		)	(121		)
Cash collateral received	(34		)	—			(107		)	—
Net amounts	$	170		$	13		$	226		$	39

Location and Pretax Gain or Loss Amounts for Derivatives

The table below provides information regarding the location and amount of pretax (gains) losses of derivatives designated in fair value or cash flow hedging relationships:

	Sales							Other (income) expense, net (1)							Other comprehensive income (loss)
Years Ended December 31	2019		2018			2017		2019			2018		2017		2019			2018			2017
Financial Statement Line Items in which Effects of Fair Value or Cash Flow Hedges are Recorded	$	46,840	$	42,294		$	40,122	$	139		(402	)	(500	)	$	(648	)	$	(361	)	$	316
(Gain) loss on fair value hedging relationships
Interest rate swap contracts
Hedged items	—		—			—		95			(27	)	(48	)	—			—			—
Derivatives designated as hedging instruments	—		—			—		(65		)	50		12		—			—			—
Impact of cash flow hedging relationships
Foreign exchange contracts
Amount of gain (loss) recognized in OCI on derivatives	—		—			—		—			—		—		87			228			(562		)
(Decrease) increase in Sales as a result of AOCI reclassifications	255		(160		)	138		—			—		—		(255		)	160			(138		)
Interest rate contracts
Amount of gain recognized in Other (income) expense, net on derivatives	—		—			—		(4		)	(4	)	(3	)	—			—			—
Amount of loss recognized in OCI on derivatives	—		—			—		—			—		—		(6		)	(4		)	(3		)

⁽¹⁾ Interest expense is a component of Other (income) expense, net.

Income Statement Effects of Derivatives Not Designated as Hedging Instruments

The table below provides information regarding the income statement effects of derivatives not designated as hedging instruments:

		Amount of Derivative Pretax (Gain) Loss Recognized in Income
Years Ended December 31	Income Statement Caption	2019		2018			2017
Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts (1)	Other (income) expense, net	$	174	$	(260	)	$	110
Foreign exchange contracts (2)	Sales	1		(8		)	(3		)

⁽¹⁾ 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.

⁽²⁾ These derivative contracts serve as economic hedges of forecasted transactions.

Information on Investments in Debt and Equity Securities

Information on investments in debt and equity securities at December 31 is as follows:

	2019								2018
	Amortized Cost		Gross Unrealized				Fair Value		Amortized Cost		Gross Unrealized					Fair Value
			Gains		Losses						Gains		Losses
Commercial paper	$	668	$	—	$	—	$	668	$	—	$	—	$	—		$	—
Corporate notes and bonds	608		13		—		621		4,985		3		(68		)	4,920
U.S. government and agency securities	266		3		—		269		895		2		(5		)	892
Asset-backed securities	226		1		—		227		1,285		1		(11		)	1,275
Foreign government bonds	—		—		—		—		167		—		(1		)	166
Mortgage-backed securities	—		—		—		—		8		—		—			8
Total debt securities	1,768		17		—		1,785		7,340		6		(85		)	7,261
Publicly traded equity securities (1)							838									456
Total debt and publicly traded equity securities							$	2,623								$	7,717

⁽¹⁾ Unrealized net gains recognized in Other (income) expense, net on equity securities still held at December 31, 2019 were $160 million during 2019. Unrealized net losses recognized in Other (income) expense, net on equity securities still held at December 31, 2018 were $35 million during 2018.

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

Financial assets and liabilities measured at fair value on a recurring basis at December 31 are summarized below:

	Fair Value Measurements Using								Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	2019								2018
Assets
Investments
Commercial paper	$	—	$	668	$	—	$	668	$	—	$	—	$	—	$	—
Corporate notes and bonds	—		621		—		621		—		4,835		—		4,835
Asset-backed securities (1)	—		227		—		227		—		1,253		—		1,253
U.S. government and agency securities	—		209		—		209		—		731		—		731
Foreign government bonds	—		—		—		—		—		166		—		166
Publicly traded equity securities	518		—		—		518		147		—		—		147
	518		1,725		—		2,243		147		6,985		—		7,132
Other assets (2)
U.S. government and agency securities	60		—		—		60		55		106		—		161
Corporate notes and bonds	—		—		—		—		—		85		—		85
Asset-backed securities (1)	—		—		—		—		—		22		—		22
Mortgage-backed securities	—		—		—		—		—		8		—		8
Publicly traded equity securities	320		—		—		320		309		—		—		309
	380		—		—		380		364		221		—		585
Derivative assets (3)
Forward exchange contracts	—		169		—		169		—		241		—		241
Purchased currency options	—		104		—		104		—		213		—		213
Interest rate swaps	—		15		—		15		—		—		—		—
	—		288		—		288		—		454		—		454
Total assets	$	898	$	2,013	$	—	$	2,911	$	511	$	7,660	$	—	$	8,171
Liabilities
Other liabilities
Contingent consideration	$	—	$	—	$	767	$	767	$	—	$	—	$	788	$	788
Derivative liabilities (3)
Forward exchange contracts	—		95		—		95		—		74		—		74
Interest rate swaps	—		1		—		1		—		81		—		81
Written currency options	—		1		—		1		—		5		—		5
	—		97		—		97		—		160		—		160
Total liabilities	$	—	$	97	$	767	$	864	$	—	$	160	$	788	$	948

⁽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.

⁽²⁾  Investments included in other assets are restricted as to use, including for the payment of benefits under employee benefit plans.

⁽³⁾ 

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.

Summarized Information about the Changes in Liabilities for Contingent Consideration

Summarized information about the changes in liabilities for contingent consideration associated with business acquisitions is as follows:

	2019			2018
Fair value January 1	$	788		$	935
Changes in estimated fair value (1)	64			89
Additions	—			8
Payments	(85		)	(244		)
Fair value December 31 (2)(3)	$	767		$	788

⁽¹⁾ Recorded in Cost of sales, Research and development expenses, and Other (income) expense, net. Includes cumulative translation adjustments.

⁽²⁾ Balance at December 31, 2019 includes $114 million recorded as a current liability for amounts expected to be paid within the next 12 months.

⁽³⁾ At December 31, 2019 and 2018, $625 million and $614 million, respectively, of the liabilities relate to the termination of the SPMSD joint venture in 2016. As part of the termination, Merck recorded a liability for contingent future royalty payments of 11.5% on net sales of all Merck products that were previously sold by the joint venture through December 31, 2024. The fair value of this liability is determined utilizing the estimated amount and timing of projected cash flows and a risk-adjusted discount rate of 8% is used to present value the cash flows.

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Equity (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Summary of Common Stock and Treasury Stock Transactions

A summary of common stock and treasury stock transactions (shares in millions) is as follows:

	2019			2018			2017
	Common Stock	Treasury Stock		Common Stock	Treasury Stock		Common Stock	Treasury Stock
Balance January 1	3,577	985		3,577	880		3,577	828
Purchases of treasury stock	—	66		—	122		—	67
Issuances (1)	—	(13	)	—	(17	)	—	(15	)
Balance December 31	3,577	1,038		3,577	985		3,577	880

⁽¹⁾  

Issuances primarily reflect activity under share-based compensation plans.

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Segment Reporting

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Segment Reporting

Segment Reporting

The Company’s operations are principally managed on a products basis and include four operating segments, which are the Pharmaceutical, Animal Health, Healthcare Services and Alliances segments. The Pharmaceutical and Animal Health segments are the only reportable segments.

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. Human health 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. During 2019, as a result of changes to the Company’s internal reporting structure, certain costs that were previously included in the Pharmaceutical segment are now being included as part of non-segment expenses within Merck Research Laboratories. Prior period Pharmaceutical segment profits have been recast to reflect these changes on a comparable basis.

The Animal Health segment discovers, develops, manufactures and markets a wide range of veterinary pharmaceutical and vaccine products, as well as health management solutions and services, for the prevention, treatment and control of disease in all major livestock and companion animal species. The Company also offers an extensive suite of digitally connected identification, traceability and monitoring products. The Company sells its products to veterinarians, distributors and animal producers.

The 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. The Company has recently sold certain businesses in the Healthcare Services segment and is in the process of divesting the remaining businesses.

The Alliances segment primarily includes activity from the Company’s relationship with AstraZeneca LP related to sales of Nexium and Prilosec, which concluded in 2018.

Sales of the Company’s products were as follows:

Years Ended December 31	2019						2018						2017
	U.S.		Int’l		Total		U.S.		Int’l		Total		U.S.		Int’l		Total
Pharmaceutical:
Oncology
Keytruda	$	6,305	$	4,779	$	11,084	$	4,150	$	3,021	$	7,171	$	2,309	$	1,500	$	3,809
Alliance revenue - Lynparza (1)	269		176		444		127		61		187		—		20		20
Alliance revenue - Lenvima (1)	239		165		404		95		54		149		—		—		—
Emend	183		205		388		312		210		522		342		213		556
Vaccines
Gardasil/Gardasil 9	1,831		1,905		3,737		1,873		1,279		3,151		1,565		743		2,308
ProQuad/M-M-R II/Varivax	1,683		592		2,275		1,430		368		1,798		1,374		303		1,676
Pneumovax 23	679		247		926		627		281		907		581		240		821
RotaTeq	506		284		791		496		232		728		481		204		686
Vaqta	130		108		238		127		112		239		94		124		218
Hospital Acute Care
Bridion	533		598		1,131		386		531		917		239		465		704
Noxafil	282		380		662		353		389		742		309		327		636
Primaxin	2		271		273		7		258		265		10		270		280
Invanz	30		233		263		253		243		496		361		241		602
Cubicin	92		165		257		191		176		367		189		193		382
Cancidas	6		242		249		12		314		326		20		402		422
Immunology
Simponi	—		830		830		—		893		893		—		819		819
Remicade	—		411		411		—		582		582		—		837		837
Neuroscience
Belsomra	92		214		306		96		164		260		98		112		210
Virology
Isentress/Isentress HD	398		576		975		513		627		1,140		565		639		1,204
Zepatier	118		252		370		8		447		455		771		888		1,660
Cardiovascular
Zetia	14		575		590		45		813		857		352		992		1,344
Vytorin	16		269		285		10		487		497		124		627		751
Atozet	—		391		391		—		347		347		—		225		225
Adempas	—		419		419		—		329		329		—		300		300
Diabetes
Januvia	1,724		1,758		3,482		1,969		1,718		3,686		2,153		1,584		3,737
Janumet	589		1,452		2,041		811		1,417		2,228		863		1,296		2,158
Women’s Health
NuvaRing	742		136		879		722		180		902		564		197		761
Implanon/Nexplanon	568		219		787		495		208		703		496		191		686
Diversified Brands
Singulair	29		669		698		20		688		708		40		692		732
Cozaar/Hyzaar	24		418		442		23		431		453		18		466		484
Nasonex	9		284		293		23		353		376		54		333		387
Arcoxia	—		288		288		—		335		335		—		363		363
Follistim AQ	103		138		241		115		153		268		123		174		298
Other pharmaceutical (2)	1,563		3,343		4,901		1,319		3,380		4,705		1,759		3,556		5,314
Total Pharmaceutical segment sales	18,759		22,992		41,751		16,608		21,081		37,689		15,854		19,536		35,390
Animal Health:
Livestock	582		2,201		2,784		528		2,102		2,630		471		2,013		2,484
Companion Animals	724		885		1,609		710		872		1,582		619		772		1,391
Total Animal Health segment sales	1,306		3,086		4,393		1,238		2,974		4,212		1,090		2,785		3,875
Other segment sales (3)	174		1		175		248		2		250		396		1		397
Total segment sales	20,239		26,079		46,319		18,094		24,057		42,151		17,340		22,322		39,662
Other (4)	86		436		521		118		26		143		84		376		460
	$	20,325	$	26,515	$	46,840	$	18,212	$	24,083	$	42,294	$	17,424	$	22,698	$	40,122

U.S. plus international may not equal total due to rounding.

⁽¹⁾  Alliance revenue represents Merck’s share of profits, which are product sales net of cost of sales and commercialization costs (see Note 4).

⁽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 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 2019, 2018 and 2017 also includes approximately $80 million, $95 million and $85 million, respectively, related to the sale of the marketing rights to certain products.

Consolidated sales by geographic area where derived are as follows:

Years Ended December 31	2019		2018		2017
United States	$	20,325	$	18,212	$	17,424
Europe, Middle East and Africa	12,707		12,213		11,478
Japan	3,583		3,212		3,122
China	3,207		2,184		1,586
Asia Pacific (other than Japan and China)	2,943		2,909		2,751
Latin America	2,469		2,415		2,339
Other	1,606		1,149		1,422
	$	46,840	$	42,294	$	40,122

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

Years Ended December 31	2019			2018			2017
Segment profits:
Pharmaceutical segment	$	28,324		$	24,871		$	23,018
Animal Health segment	1,609			1,659			1,552
Other segments	(7		)	103			275
Total segment profits	29,926			26,633			24,845
Other profits	363			6			26
Unallocated:
Interest income	274			343			385
Interest expense	(893		)	(772		)	(754		)
Depreciation and amortization	(1,573		)	(1,334		)	(1,378		)
Research and development	(9,499		)	(9,432		)	(10,004		)
Amortization of purchase accounting adjustments	(1,419		)	(2,664		)	(3,056		)
Restructuring costs	(638		)	(632		)	(776		)
Charge related to the termination of a collaboration with Samsung	—			(423		)	—
Loss on extinguishment of debt	—			—			(191		)
Other unallocated, net	(5,077		)	(3,024		)	(2,576		)
Income Before Taxes	$	11,464		$	8,701		$	6,521

Pharmaceutical segment profits are comprised of segment sales less standard costs, as well as selling, general and administrative expenses directly incurred by the segment. Animal Health segment profits are comprised of segment sales, less all cost of sales, as well as selling, general and administrative expenses and research and development costs directly incurred by the segment. For internal management reporting presented to the chief operating decision maker, Merck does not allocate the remaining cost of sales not included in segment profits as described above, research and development expenses incurred in Merck Research Laboratories, the Company’s research and development division that focuses on human health-related activities, 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 other intangible asset impairment charges, gains or losses on sales of businesses, expense or income related to changes in the estimated fair value of liabilities for contingent consideration, and other miscellaneous income or expense items.

Equity (income) loss from affiliates and depreciation and amortization included in segment profits is as follows:

	Pharmaceutical		Animal Health		All Other		Total
Year Ended December 31, 2019
Included in segment profits:
Equity (income) loss from affiliates	$	—	$	—	$	—	$	—
Depreciation and amortization	137		109		10		256
Year Ended December 31, 2018
Included in segment profits:
Equity (income) loss from affiliates	$	4	$	—	$	—	$	4
Depreciation and amortization	243		82		10		335
Year Ended December 31, 2017
Included in segment profits:
Equity (income) loss from affiliates	$	7	$	—	$	—	$	7
Depreciation and amortization	125		75		12		212

Property, plant and equipment, net, by geographic area where located is as follows:

December 31	2019		2018		2017
United States	$	8,974	$	8,306	$	8,070
Europe, Middle East and Africa	4,767		3,706		3,151
Asia Pacific (other than Japan and China)	714		684		632
Latin America	266		264		271
China	174		167		150
Japan	152		159		158
Other	6		5		7
	$	15,053	$	13,291	$	12,439

The Company does not disaggregate assets on a products and services basis for internal management reporting and, therefore, such information is not presented.

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Other (Income) Expense, Net

12 Months Ended

Dec. 31, 2019

Other Income and Expenses [Abstract]

Other (Income) Expense, Net

Other (Income) Expense, Net

Other (income) expense, net, consisted of:

Years Ended December 31	2019			2018			2017
Interest income	$	(274	)	$	(343	)	$	(385	)
Interest expense	893			772			754
Exchange losses (gains)	187			145			(11		)
Income from investments in equity securities, net (1)	(170		)	(324		)	(352		)
Net periodic defined benefit plan (credit) cost other than service cost	(545		)	(512		)	(512		)
Other, net	48			(140		)	6
	$	139		$	(402	)	$	(500	)

⁽¹⁾ Includes net realized and unrealized gains and losses from investments in equity securities either owned directly or through ownership interests in investment funds.

Other, net (as presented in the table above) in 2019 includes $162 million of goodwill impairment charges related to certain businesses in the Healthcare Services segment (see Note 8).

Other, net in 2018 includes a gain of $115 million related to the settlement of certain patent litigation, income of $99 million related to AstraZeneca’s option exercise in 2014 in connection with the termination of the Company’s relationship with AstraZeneca LP (AZLP), and a gain of $85 million resulting from the receipt of a milestone payment for an out-licensed migraine clinical development program. Other, net in 2018 also includes $144 million of goodwill impairment charges related to certain businesses in the Healthcare Services segment (see Note 8), as well as $41 million of charges related to the write-down of assets held for sale to fair value in anticipation of the dissolution of the Company’s joint venture with Supera Farma Laboratorios S.A. in Brazil.

Other, net in 2017 includes income of $232 million related to AstraZeneca’s option exercise and a $191 million loss on extinguishment of debt.

Interest paid was $841 million in 2019, $777 million in 2018 and $723 million in 2017.

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Segment Reporting - Schedule of Equity Income from Affiliates and Depreciation and Amortization Included in Segment Profits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 3,652	$ 4,519	$ 4,676
Operating Segments
Segment Reporting Information [Line Items]
Equity (income) loss from affiliates	0	4	7
Depreciation and amortization	256	335	212
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Equity (income) loss from affiliates	0	4	7
Depreciation and amortization	137	243	125
Operating Segments | Animal Health
Segment Reporting Information [Line Items]
Equity (income) loss from affiliates	0	0	0
Depreciation and amortization	109	82	75
Operating Segments | All Other
Segment Reporting Information [Line Items]
Equity (income) loss from affiliates	0	0	0
Depreciation and amortization	$ 10	$ 10	$ 12

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Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Changes in AOCI by Component

Changes in AOCI by component are as follows:

	Derivatives				Investments				Employee Benefit Plans				Cumulative Translation Adjustment			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2017, net of taxes	$	338			$	(3	)		$	(3,206	)		$	(2,355	)	$	(5,226	)
Other comprehensive income (loss) before reclassification adjustments, pretax	(561		)		212				438				235			324
Tax	207				(35		)		(106		)		166			232
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(354		)		177				332				401			556
Reclassification adjustments, pretax	(141		)	(1)	(291		)	(2)	117			(3)	—			(315		)
Tax	49				56				(30		)		—			75
Reclassification adjustments, net of taxes	(92		)		(235		)		87				—			(240		)
Other comprehensive income (loss), net of taxes	(446		)		(58		)		419				401			316
Balance at December 31, 2017, net of taxes	(108		)		(61		)		(2,787		)		(1,954		)	(4,910		)
Other comprehensive income (loss) before reclassification adjustments, pretax	228				(108		)		(728		)		(84		)	(692		)
Tax	(55		)		1				169				(139		)	(24		)
Other comprehensive income (loss) before reclassification adjustments, net of taxes	173				(107		)		(559		)		(223		)	(716		)
Reclassification adjustments, pretax	157			(1)	97			(2)	170			(3)	—			424
Tax	(33		)		—				(36		)		—			(69		)
Reclassification adjustments, net of taxes	124				97				134				—			355
Other comprehensive income (loss), net of taxes	297				(10		)		(425		)		(223		)	(361		)
Adoption of ASU 2018-02	(23		)		1				(344		)		100			(266		)
Adoption of ASU 2016-01	—				(8		)		—				—			(8		)
Balance at December 31, 2018, net of taxes	166				(78		)		(3,556		)	(4)	(2,077		)	(5,545		)
Other comprehensive income (loss) before reclassification adjustments, pretax	86				140				(948		)		112			(610		)
Tax	(15		)		—				192				(16		)	161
Other comprehensive income (loss) before reclassification adjustments, net of taxes	71				140				(756		)		96			(449		)
Reclassification adjustments, pretax	(261		)	(1)	(44		)	(2)	66			(3)	—			(239		)
Tax	55				—				(15		)		—			40
Reclassification adjustments, net of taxes	(206		)		(44		)		51				—			(199		)
Other comprehensive income (loss), net of taxes	(135		)		96				(705		)		96			(648		)
Balance at December 31, 2019, net of taxes	$	31			$	18			$	(4,261	)	(4)	$	(1,981	)	$	(6,193	)

⁽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. In 2017, these amounts included both investments in debt and equity securities; however, as a result of the adoption of ASU 2016-01 in 2018, these amounts relate only to investments in available-for-sale debt securities.

⁽³⁾  Includes net amortization of prior service cost and actuarial gains and losses included in net periodic benefit cost (see Note 13).

⁽⁴⁾ 

Includes pension plan net loss of $5.1 billion and $4.4 billion at December 31, 2019 and 2018, respectively, and other postretirement benefit plan net gain of $247 million and $170 million at December 31, 2019 and 2018, respectively, as well as pension plan prior service credit of $263 million and $314 million at December 31, 2019 and 2018, respectively, and other postretirement benefit plan prior service credit of $305 million and $375 million at December 31, 2019 and 2018, respectively.

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Acquisitions, Divestitures, Research Collaborations and License Agreements - Acquisitions Narrative (Detail) € in Millions, $ in Millions, $ in Millions		1 Months Ended								3 Months Ended	12 Months Ended
	Apr. 01, 2019 USD ($)	Jan. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jun. 30, 2018 AUD ($)	Jun. 30, 2018 USD ($)	Oct. 31, 2017 USD ($)	Oct. 31, 2017 EUR (€)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Research and development											$ 9,872	$ 9,752	$ 10,339
Goodwill										$ 18,284	19,425	18,253	$ 18,284
Peloton
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Cash paid for acquisition of business			$ 1,200
Research and development											$ 993
Deferred tax liabilities			52
Other assets and liabilities, net			4
Cash and cash equivalents			157
Antelliq
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Cash paid for acquisition of business	$ 2,300
Debt assumed	1,300
Deferred tax liabilities	520
Other assets and liabilities, net	(81)
Goodwill	1,302
Transaction costs	47
Cash and cash equivalents	$ 31
Immune Design
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Cash paid for acquisition of business				$ 301
Other net assets				42
Goodwill				20
In-process research and development (IPR&D)				156
Cash and cash equivalents				$ 83
Viralytics
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Cash paid for acquisition of business					$ 502	$ 378
Other net assets						$ 34
Research and development												$ 344
Rigontec
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Cash paid for acquisition of business							$ 140	€ 119
Potential future milestone payments, maximum | €								349
Potential future milestone payment, research milestones and regulatory approvals | €								184
Potential future milestone payment, commercial targets | €								€ 165
Vallee SA
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Cash paid for acquisition of business									$ 358
Other net assets									$ 32
Voting rights acquired (as percent)									93.50%	4.50%			4.50%
Escrow deposit									$ 176
Identifiable intangible assets									297
Deferred tax liabilities									102
Noncontrolling interest									25
Contingent liabilities									37
Indemnification assets									37
Goodwill									$ 156
Estimated useful life of intangible assets, acquired									15 years
Payments to acquire additional interest										$ 18
Regulatory Milestones | Peloton
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Potential future milestone payments, maximum			50
Commercial Milestone | Peloton
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Potential future milestone payments, maximum			50
Sales-Based Milestones | Peloton
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Potential future milestone payments, maximum			$ 1,050
Subsequent Event | ArQule
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Cash paid for acquisition of business		$ 2,700

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Taxes on Income - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax [Line Items]
Transition tax	$ 117
Decrease in deferred tax liability			$ 2,000
Measurement period adjustment		$ 124
Transition tax for accumulated foreign earnings		5,500
Transition tax for accumulated foreign earnings, liability	3,400		5,300
Provisional income tax benefit			779
Income tax benefit		32
Deferred tax assets on NOL carryforwards relating to foreign jurisdictions	762
Deferred tax assets relating to various U.S. tax credit carryforwards and NOL carryforwards	135
Income taxes paid	4,500	1,500	4,900
Tax benefits relating to stock option exercises	65	77	73
Unrecognized tax benefits	1,225	1,893	1,723	$ 3,494
Favorable net impact to income tax provision if unrecognized tax benefits were recognized	1,100
Reasonably possible amount that liability for unrecognized tax benefits could decline up to in next 12 months (up to)	40
Interest and penalties associated with uncertain tax positions, expense (benefit)	(101)	51	183
Liabilities for accrued interest and penalties	243	372
Unrecognized tax benefits from adjustments related to examination	356	$ 91	1,388
Foreign Jurisdiction
Income Tax [Line Items]
Valuation allowance on foreign NOL carryforwards	1,100
Federal | Internal Revenue Service (IRS)
Income Tax [Line Items]
Income taxes paid	107		2,800
Unrecognized tax benefits from adjustments related to examination	364		$ 234
Income Taxes Payable
Income Tax [Line Items]
Transition tax liability, current	390
Other Noncurrent Liabilities
Income Tax [Line Items]
Transition tax liability, noncurrent	$ 3,000

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Goodwill and Other Intangibles - Other Intangibles (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 55,324	$ 52,372
Accumulated Amortization	41,128	39,268
Net	14,196	13,104
IPR&D
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	1,032	1,064
Net	1,032	1,064
Products and product rights
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	45,947	46,615
Accumulated Amortization	38,852	37,585
Net	7,095	9,030
Licenses
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	3,185	2,081
Accumulated Amortization	824	408
Net	2,361	1,673
Trade names
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	2,899	209
Accumulated Amortization	217	107
Net	2,682	102
Other
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	2,261	2,403
Accumulated Amortization	1,235	1,168
Net	$ 1,026	$ 1,235

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Inventories - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Inventory [Line Items]
LIFO inventory amount	$ 2,600	$ 2,500
Inventories classified in other assets	1,480	1,417
Inventory Not Expected to be Sold Within One Year
Inventory [Line Items]
Inventories classified in other assets	1,300	1,400
Inventories Produced in Preparation for Product Launches
Inventory [Line Items]
Inventories classified in other assets	$ 168	$ 7

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Pension and Other Postretirement Benefit Plans - Summary of Weighted Average Assumptions Used in Determining Pension Plan and U.S. Pension and Other Postretirement Benefit Plan Information (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
United States
Net periodic benefit cost
Discount rate	4.40%	3.70%	4.30%
Expected rate of return on plan assets	8.10%	8.20%	8.70%
Salary growth rate	4.30%	4.30%	4.30%
Interest crediting rate	3.40%	3.30%	3.30%
Benefit obligation
Discount rate	3.40%	4.40%	3.70%
Salary growth rate	4.20%	4.30%	4.30%
Interest crediting rate	4.90%	3.40%	3.30%
International | Pension Benefits
Net periodic benefit cost
Discount rate	2.20%	2.10%	2.20%
Expected rate of return on plan assets	4.90%	5.10%	5.10%
Salary growth rate	2.80%	2.90%	2.90%
Interest crediting rate	2.90%	2.80%	3.00%
Benefit obligation
Discount rate	1.50%	2.20%	2.10%
Salary growth rate	2.80%	2.80%	2.90%
Interest crediting rate	2.80%	2.90%	2.80%

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Pension and Other Postretirement Benefit Plans - Summary of Changes in Fair Value of Company's Level 3 Pension Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	$ 826
Actual return on plan assets:
Fair value of plan assets December 31	860	$ 826
United States
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	9,648	10,896
Actual return on plan assets:
Fair value of plan assets December 31	11,361	9,648
United States | Other
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	13
Actual return on plan assets:
Fair value of plan assets December 31	9	13
United States | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	13	15
Actual return on plan assets:
Relating to assets still held at December 31	(8)	(3)
Relating to assets sold during the year	8	4
Purchases and sales, net	(4)	(3)
Fair value of plan assets December 31	9	13
United States | Level 3 | Insurance Contracts
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	0	0
Actual return on plan assets:
Relating to assets still held at December 31	0	0
Relating to assets sold during the year	0	0
Purchases and sales, net	0	0
Fair value of plan assets December 31	0	0
United States | Level 3 | Real Estate
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	0	0
Actual return on plan assets:
Relating to assets still held at December 31	0	0
Relating to assets sold during the year	0	0
Purchases and sales, net	0	0
Fair value of plan assets December 31	0	0
United States | Level 3 | Other
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	13	15
Actual return on plan assets:
Relating to assets still held at December 31	(8)	(3)
Relating to assets sold during the year	8	4
Purchases and sales, net	(4)	(3)
Fair value of plan assets December 31	9	13
International
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	8,580	9,339
Actual return on plan assets:
Fair value of plan assets December 31	10,163	8,580
International | Insurance Contracts
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	877
Actual return on plan assets:
Fair value of plan assets December 31	916	877
International | Real Estate
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	2
Actual return on plan assets:
Fair value of plan assets December 31	1	2
International | Other
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	18
Actual return on plan assets:
Fair value of plan assets December 31	21	18
International | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	813	473
Actual return on plan assets:
Relating to assets still held at December 31	54	(32)
Purchases and sales, net	(16)	379
Transfers out of Level 3	0	(7)
Fair value of plan assets December 31	851	813
International | Level 3 | Insurance Contracts
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	811	470
Actual return on plan assets:
Relating to assets still held at December 31	54	(32)
Purchases and sales, net	(14)	380
Transfers out of Level 3	0	(7)
Fair value of plan assets December 31	851	811
International | Level 3 | Real Estate
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	1	2
Actual return on plan assets:
Relating to assets still held at December 31	0	0
Purchases and sales, net	(1)	(1)
Transfers out of Level 3	0	0
Fair value of plan assets December 31	0	1
International | Level 3 | Other
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	1	1
Actual return on plan assets:
Relating to assets still held at December 31	0	0
Purchases and sales, net	(1)	0
Transfers out of Level 3	0	0
Fair value of plan assets December 31	$ 0	$ 1

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Financial Instruments - Effects of Derivatives Not Designated as Hedging Instruments (Details) - Foreign exchange contracts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other (income) expense, net
Derivative [Line Items]
Amount of Derivative Pretax (Gain) Loss Recognized in Income	$ 174	$ (260)	$ 110
Sales
Derivative [Line Items]
Amount of Derivative Pretax (Gain) Loss Recognized in Income	$ 1	$ (8)	$ (3)