<SEC-DOCUMENT>0001140361-21-003357.txt : 20210204
<SEC-HEADER>0001140361-21-003357.hdr.sgml : 20210204
<ACCEPTANCE-DATETIME>20210204111601
ACCESSION NUMBER:		0001140361-21-003357
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		15
CONFORMED PERIOD OF REPORT:	20210201
ITEM INFORMATION:		Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20210204
DATE AS OF CHANGE:		20210204

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Merck & Co., Inc.
		CENTRAL INDEX KEY:			0000310158
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				221918501
		STATE OF INCORPORATION:			NJ
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-06571
		FILM NUMBER:		21589646

	BUSINESS ADDRESS:	
		STREET 1:		2000 GALLOPING HILL ROAD
		CITY:			KENILWORTH
		STATE:			NJ
		ZIP:			07033
		BUSINESS PHONE:		908-740-4000

	MAIL ADDRESS:	
		STREET 1:		2000 GALLOPING HILL ROAD
		CITY:			KENILWORTH
		STATE:			NJ
		ZIP:			07033

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Merck & Co. Inc.
		DATE OF NAME CHANGE:	20091103

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SCHERING PLOUGH CORP
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
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    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 14pt; font-weight: bold;">UNITED STATES</div>

    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 14pt; font-weight: bold;">SECURITIES AND EXCHANGE COMMISSION</div>

    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 12pt; font-weight: bold;">Washington, D.C. 20549</div>

    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;"> <br />
    </div>

    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;"> <span style="font-size: 18pt;">FORM <ix:nonNumeric name="dei:DocumentType" id="Fact_53938ba7fb394023a8833433a78301b5" contextRef="c20210201to20210201">8-K</ix:nonNumeric></span></div>

    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;"> <br />
    </div>

    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">CURRENT REPORT</div>

    <div style="font-family: 'Times New Roman';"><br />
    </div>

    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">Pursuant to Section<span style="font-size: 10pt;">&#160;</span>13 OR 15(d) of the Securities Exchange Act of 1934</div>

    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt;"> <br />
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    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt;">Date of report (Date of earliest event reported):<span style="font-size: 10pt; font-weight: bold;"> <span style="text-decoration: underline;"><ix:nonNumeric name="dei:DocumentPeriodEndDate" id="Fact_06e9ad8da3cb4900bfc835922f74c1ec" contextRef="c20210201to20210201" format="ixt:datemonthdayyearen">February 1, 2021</ix:nonNumeric></span></span><span style="text-decoration: underline;"><span style="font-size: 10pt; font-weight: bold; color: rgb(0, 0, 0);"> (February 4, 2021)</span></span></div>

    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;"> <br />
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    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 24pt; font-weight: bold;"><ix:nonNumeric name="dei:EntityRegistrantName" id="Fact_3852c776439d433aa711d9cd05a59a42" contextRef="c20210201to20210201">Merck &amp; Co., Inc.</ix:nonNumeric><br />
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    <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt;">(Exact name of registrant as specified in its charter)</div>

    <div style="font-family: 'Times New Roman';"><br />
    </div>

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    <td style="width: 32%; vertical-align: top; border-bottom: 2px solid rgb(0, 0, 0); font-family: 'Times New Roman'; text-align: center; font-weight: bold;"><span style="-sec-ix-hidden:Fact_2d9284f8b3c444d3bc788368bd5519d9">1-6571</span><br />
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            <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt;">(State or other jurisdiction of incorporation)</div>
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    <td style="width: 2%; vertical-align: bottom; font-family: 'Times New Roman';"><br />
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    <td style="width: 32%; vertical-align: bottom;">
            <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt;">(Commission File Number)</div>
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    <td style="width: 2%; vertical-align: bottom; font-family: 'Times New Roman';"><br />
          </td>

    <td style="width: 32%; vertical-align: bottom;">
            <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt;">(I.R.S Employer Identification No.)</div>
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  </tr>


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    <div style="font-family: 'Times New Roman';"><br />
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    <td style="width: 49%; vertical-align: bottom; font-family: 'Times New Roman';" rowspan="1" colspan="3"><br />
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            <div style="text-align: center; color: rgb(0, 0, 0); font-size: 10pt; font-weight: bold;"><span style="-sec-ix-hidden:Fact_c3cb6259e8f644dba35179d1685207e5">2000 Galloping Hill Road</span>, <span style="-sec-ix-hidden:Fact_be9cb74e28f64d59acec0a40c19cf146">Kenilworth</span>, <span style="-sec-ix-hidden:Fact_09a6a62b03b54696adf4a9f3504d0a19">NJ</span></div>
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    <td style="width: 2%; vertical-align: bottom; font-family: 'Times New Roman';"><br />
          </td>

    <td style="width: 49%; vertical-align: bottom; border-bottom: 2px solid rgb(0, 0, 0); font-family: 'Times New Roman'; text-align: center; font-weight: bold;"><ix:nonNumeric name="dei:EntityAddressPostalZipCode" id="Fact_0a05fc3027154203888fc43695671278" contextRef="c20210201to20210201">07033</ix:nonNumeric><br />
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    <td style="width: 49%; vertical-align: top; font-family: 'Times New Roman';">
            <div style="text-align: center; color: rgb(0, 0, 0); font-size: 10pt;">(Address of principal executive offices)</div>
          </td>

    <td style="width: 2%; vertical-align: bottom; font-family: 'Times New Roman';"><br />
          </td>

    <td style="width: 49%; vertical-align: top; font-family: 'Times New Roman';">
            <div style="text-align: center; color: rgb(0, 0, 0); font-size: 10pt;">(Zip code)</div>
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    <div style="font-family: 'Times New Roman';"><br />
    </div>

    <div style="font-family: 'Times New Roman';">
      <div style="text-align: center; font-size: 10pt;">(Registrant&#8217;s telephone number, including area code)<span style="font-size: 10pt; font-weight: bold;">&#160;</span><span style="text-decoration: underline;"><span style="font-size: 10pt; font-weight: bold; color: rgb(0, 0, 0);">(<ix:nonNumeric name="dei:CityAreaCode" id="Fact_47694a3c011649c08df766f036512023" contextRef="c20210201to20210201">908</ix:nonNumeric>)</span><span style="font-size: 10pt; font-weight: bold;"> </span><span style="font-weight: bold;"><ix:nonNumeric name="dei:LocalPhoneNumber" id="Fact_068cf4f6a0f24ecf94cc4df0eb516ed0" contextRef="c20210201to20210201">740-4000</ix:nonNumeric></span></span></div>

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    <div style="font-family: 'Times New Roman';"><br />
    </div>

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    <td style="width: 25%; vertical-align: top; font-family: 'Times New Roman';"><br />
          </td>

    <td style="width: 50%; vertical-align: middle; border-bottom: 2px solid rgb(0, 0, 0); font-family: 'Times New Roman';">
            <div style="text-align: center; color: rgb(0, 0, 0); font-size: 10pt; font-weight: bold;">Not Applicable</div>
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    <td style="width: 25%; vertical-align: top; font-family: 'Times New Roman';"><br />
          </td>

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    <td colspan="3" style="vertical-align: top; font-family: 'Times New Roman';">
            <div style="text-align: center; color: rgb(0, 0, 0); font-size: 10pt;">(Former name, former address, and former fiscal year if changed since last report.)</div>
          </td>

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    <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;"> <br />
    </div>

    <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</div>

    <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;"> <br />
    </div>

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    <td style="width: 27pt; vertical-align: top; color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 10pt;"><ix:nonNumeric name="dei:WrittenCommunications" id="Fact_28f8feec457c4f97bb9f5d22f6e1dff1" contextRef="c20210201to20210201" format="ixt-sec:boolballotbox">&#x2610;</ix:nonNumeric><br />
          </td>

    <td style="width: auto; vertical-align: top; text-align: left; font-family: 'Times New Roman';">
            <div style="color: rgb(0, 0, 0); font-size: 10pt;">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</div>
          </td>

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</table>
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    <td style="width: 27pt; vertical-align: top; color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 10pt;"><ix:nonNumeric name="dei:SolicitingMaterial" id="Fact_42ad350684764f489bb243d20e6af287" contextRef="c20210201to20210201" format="ixt-sec:boolballotbox">&#x2610;</ix:nonNumeric></td>

    <td style="width: auto; vertical-align: top; text-align: left; font-family: 'Times New Roman';">
            <div style="color: rgb(0, 0, 0); font-size: 10pt;">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</div>
          </td>

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    <td style="width: 27pt; vertical-align: top; color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 10pt;"><ix:nonNumeric name="dei:PreCommencementTenderOffer" id="Fact_74c82c5abcfc42319cb6a13addd40d3c" contextRef="c20210201to20210201" format="ixt-sec:boolballotbox">&#x2610;</ix:nonNumeric></td>

    <td style="width: auto; vertical-align: top; text-align: left; font-family: 'Times New Roman';">
            <div style="color: rgb(0, 0, 0); font-size: 10pt;">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</div>
          </td>

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</table>
    <table cellspacing="0" cellpadding="0" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%; text-align: left; color: #000000;" class="DSPFListTable" id="z11e7eddc16ab4600abe0347956facf7a">


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    <td style="width: 27pt; vertical-align: top; color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 10pt;"><ix:nonNumeric name="dei:PreCommencementIssuerTenderOffer" id="Fact_b7375333fea8477a916b85bbddd376a7" contextRef="c20210201to20210201" format="ixt-sec:boolballotbox">&#x2610;</ix:nonNumeric></td>

    <td style="width: auto; vertical-align: top; text-align: left; font-family: 'Times New Roman';">
            <div style="color: rgb(0, 0, 0); font-size: 10pt;">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</div>
          </td>

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</table>
    <div style="font-family: 'Times New Roman';"><br />
    </div>

    <div style="text-align: left; color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 10pt;">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (&#167;230.405 of this
      chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (&#167;240.12b-2 of this chapter).</div>

    <div style="text-align: left; margin-left: 6pt; font-family: 'Times New Roman'; font-size: 10pt;"> <br />
    </div>

    <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">Emerging growth company&#160; <ix:nonNumeric name="dei:EntityEmergingGrowthCompany" id="Fact_abbe0234bb5e4421b63af40fcf73b9f2" contextRef="c20210201to20210201" format="ixt-sec:boolballotbox">&#x2610;</ix:nonNumeric></div>

    <div style="text-align: left; margin-left: 6pt; font-family: 'Times New Roman'; font-size: 10pt;"> <br />
    </div>

    <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">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. &#9744; </div>

    <div style="text-align: left; margin-left: 6pt; font-family: 'Times New Roman'; font-size: 10pt;"> <br />
    </div>

    <div style="text-align: left; color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">Securities registered pursuant to Section 12(b) of the Act:</div>

    <div style="font-family: 'Times New Roman';"><br />
    </div>

    <table cellspacing="0" cellpadding="0" border="0" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%; border-collapse: collapse; text-align: left; color: #000000;" id="ze96c22d4df3444fab2701ef9e30eadcd">


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    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman';">
            <div style="text-align: center; color: rgb(0, 0, 0); font-size: 10pt; font-style: italic;"><span style="text-decoration: underline;">Title of Each Class</span></div>
          </td>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman';">
            <div style="text-align: center; color: rgb(0, 0, 0); font-size: 10pt; font-style: italic;"><span style="text-decoration: underline;">Trading Symbol(s)</span></div>
          </td>

    <td style="width: 50%; vertical-align: bottom; font-family: 'Times New Roman';">
            <div style="text-align: center; color: rgb(0, 0, 0); font-size: 10pt; font-style: italic;"><span style="text-decoration: underline;">Name of Each Exchange on which Registered</span></div>
          </td>

  </tr>

  <tr>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:Security12bTitle" id="Fact_0cce5d35d0f84c8b9c5744a549166a22" contextRef="c20210201to20210201_StatementClassOfStockAxis_CommonStockMember">Common Stock ($0.50 par value)</ix:nonNumeric><br />
          </td>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:TradingSymbol" id="Fact_bf4c68b561634048b6e5191a5bab48f4" contextRef="c20210201to20210201_StatementClassOfStockAxis_CommonStockMember">MRK</ix:nonNumeric><br />
          </td>

    <td style="width: 50%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:SecurityExchangeName" id="Fact_1d71418d6b074809a65bef851b7106ca" contextRef="c20210201to20210201_StatementClassOfStockAxis_CommonStockMember" format="ixt-sec:exchnameen">New York Stock Exchange</ix:nonNumeric><br />
          </td>

  </tr>

  <tr>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:Security12bTitle" id="Fact_851cb23632b945dd987792e2e15cbcce" contextRef="c20210201to20210201_StatementClassOfStockAxis_One125NotesDue2021Member">1.125% Notes due 2021</ix:nonNumeric><br />
          </td>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:TradingSymbol" id="Fact_64d12c6e78664c699da30af49eaba1af" contextRef="c20210201to20210201_StatementClassOfStockAxis_One125NotesDue2021Member">MRK/21</ix:nonNumeric><br />
          </td>

    <td style="width: 50%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:SecurityExchangeName" id="Fact_2692755b7b4b483284cc14d919611136" contextRef="c20210201to20210201_StatementClassOfStockAxis_One125NotesDue2021Member" format="ixt-sec:exchnameen">New York Stock Exchange</ix:nonNumeric><br />
          </td>

  </tr>

  <tr>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:Security12bTitle" id="Fact_5578c059367048289db81853ce230ec0" contextRef="c20210201to20210201_StatementClassOfStockAxis_Zero500NotesDue2024Member">0.500% Notes due 2024</ix:nonNumeric><br />
          </td>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:TradingSymbol" id="Fact_f626e6bf567642ad8b93b802d83910b5" contextRef="c20210201to20210201_StatementClassOfStockAxis_Zero500NotesDue2024Member">MRK24</ix:nonNumeric><br />
          </td>

    <td style="width: 50%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:SecurityExchangeName" id="Fact_c8d871b42d8541fe86a64c6f60da1ce8" contextRef="c20210201to20210201_StatementClassOfStockAxis_Zero500NotesDue2024Member" format="ixt-sec:exchnameen">New York Stock Exchange</ix:nonNumeric><br />
          </td>

  </tr>

  <tr>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:Security12bTitle" id="Fact_8f46ea762eae473b879ac69e619150e5" contextRef="c20210201to20210201_StatementClassOfStockAxis_One875NotesDue2026Member">1.875% Notes due 2026</ix:nonNumeric><br />
          </td>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:TradingSymbol" id="Fact_b69a1465d31f408783029071bb1b8e03" contextRef="c20210201to20210201_StatementClassOfStockAxis_One875NotesDue2026Member">MRK/26</ix:nonNumeric><br />
          </td>

    <td style="width: 50%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:SecurityExchangeName" id="Fact_436fb3d7a13a442b83e0d73345b5b438" contextRef="c20210201to20210201_StatementClassOfStockAxis_One875NotesDue2026Member" format="ixt-sec:exchnameen">New York Stock Exchange</ix:nonNumeric><br />
          </td>

  </tr>

  <tr>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:Security12bTitle" id="Fact_6002324e952c4800afdd5ad16d2a7926" contextRef="c20210201to20210201_StatementClassOfStockAxis_Two500NotesDue2034Member">2.500% Notes due 2034</ix:nonNumeric><br />
          </td>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:TradingSymbol" id="Fact_427659a5af154f8089d11dcf81daef93" contextRef="c20210201to20210201_StatementClassOfStockAxis_Two500NotesDue2034Member">MRK/34</ix:nonNumeric><br />
          </td>

    <td style="width: 50%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:SecurityExchangeName" id="Fact_c7d98a4ec5fb49eebae574f7560399fb" contextRef="c20210201to20210201_StatementClassOfStockAxis_Two500NotesDue2034Member" format="ixt-sec:exchnameen">New York Stock Exchange</ix:nonNumeric><br />
          </td>

  </tr>

  <tr>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:Security12bTitle" id="Fact_c1f6492fe3684a959e58909c80b0d5fe" contextRef="c20210201to20210201_StatementClassOfStockAxis_One375NotesDue2036Member">1.375% Notes due 2036</ix:nonNumeric><br />
          </td>

    <td style="width: 25%; vertical-align: bottom; font-family: 'Times New Roman'; text-align: center;"><ix:nonNumeric name="dei:TradingSymbol" id="Fact_e4bba46e41fc45e991bd46dfde327246" contextRef="c20210201to20210201_StatementClassOfStockAxis_One375NotesDue2036Member">MRK36A</ix:nonNumeric><br />
          </td>

    <td style="width: 50%; vertical-align: bottom; text-align: center;"><ix:nonNumeric name="dei:SecurityExchangeName" id="Fact_ceefdc1f501140ca927be379f580e8be" contextRef="c20210201to20210201_StatementClassOfStockAxis_One375NotesDue2036Member" format="ixt-sec:exchnameen">New York Stock Exchange</ix:nonNumeric><br />
          </td>

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    <div style="font-family: 'Times New Roman';"><br />
    </div>

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      <hr style="border: none; border-bottom: 4px solid black; border-top: 1px solid black; height: 10px; color: #ffffff; background-color: #ffffff; text-align: center; margin-left: auto; margin-right: auto;" /></div>

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      <div style="page-break-after:always;">
        <hr style="margin: 4px 0px; width: 100%; border-width: 0; height: 2px; color: #000000; background-color: #000000; clear: both;" /></div>

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    <table cellspacing="0" cellpadding="0" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%; text-align: left; color: #000000;" class="DSPFListTable" id="ze5bb563ddd57442a801852dcd86151e3">


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    <td style="width: 54pt; vertical-align: top; color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">Item 5.02.</td>

    <td style="width: auto; vertical-align: top; text-align: left;">
            <div style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; font-weight: bold;"><span style="font-size: 10pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0);">Departure of Directors or Certain Officers; Election of
                Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers</span><span style="font-family: 'Times New Roman';">.</span></div>
          </td>

  </tr>


</table>
    <div style="font-family: 'Times New Roman';"><br />
    </div>

    <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">(b)(c)(d)</div>

    <div style="font-family: 'Times New Roman';"><br />
    </div>

    <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">Merck &amp; Co., Inc. (the &#8220;Company&#8221;) announced that Kenneth C. Frazier, the Company&#8217;s Chairman and Chief Executive Officer will retire as Chief Executive Officer,
      effective June 30, 2021.&#160; After his retirement, Mr. Frazier will continue as Executive Chairman of the Company for a transition period to be determined by the Board of Directors (&#8220;Board&#8221;).</div>

    <div style="font-family: 'Times New Roman';"><br />
    </div>

    <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">In addition, on February 1, 2021, the Board unanimously elected Robert M. Davis, age 54, the Company&#8217;s current Executive Vice President, Global Services and Chief Financial
      Officer, to serve as President of the Company, effective April 1, 2021, and as the Chief Executive Officer and a director of the Company, effective July 1, 2021.</div>

    <div style="font-family: 'Times New Roman';"><br />
    </div>

    <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">On February 4, 2021, the Company issued a press release (the &#8220;Press Release&#8221;) announcing the foregoing.&#160; The Press Release is attached as Exhibit 99.1 and incorporated
      herein by reference.</div>

    <div style="font-family: 'Times New Roman';"><br />
    </div>

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    <td style="width: 54pt; vertical-align: top; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">Item 9.01.</td>

    <td style="width: auto; vertical-align: top; text-align: left; font-family: 'Times New Roman';">
            <div style="font-size: 10pt; font-weight: bold;">Financial Statements and Exhibits.</div>
          </td>

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    <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;"> <br />
    </div>

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      <table cellspacing="0" cellpadding="0" style="width: 100%; font-family: 'Times New Roman'; font-size: 10pt;" id="zf4431ac7f96c40b3a020b071364e93ff" class="DSPFListTable">


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    <td style="vertical-align: top; width: 18pt;">
              <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">(d)</div>
            </td>

    <td style="align: left; vertical-align: top; width: auto;">
              <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">Exhibits</div>
            </td>

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    </div>

    <div style="font-family: 'Times New Roman';"><br />
    </div>

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    <td style="width: 5%; vertical-align: top; font-family: 'Times New Roman';">
            <div style="text-align: left; font-size: 10pt;"><a href="brhc10019731_ex99-1.htm">99.1</a></div>
          </td>

    <td style="width: 95%; vertical-align: top; font-family: 'Times New Roman';">
            <div style="text-align: left; font-size: 10pt;">Press Release issued February 4, 2021</div>
          </td>

  </tr>

  <tr>

    <td style="width: 5%; vertical-align: top; font-family: 'Times New Roman';"><br />
          </td>

    <td style="width: 95%; vertical-align: top; font-family: 'Times New Roman';"><br />
          </td>

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    <td style="width: 5%; vertical-align: top; font-family: 'Times New Roman';">
            <div style="text-align: left; font-size: 10pt;">104</div>
          </td>

    <td style="width: 95%; vertical-align: top; font-family: 'Times New Roman';">
            <div style="text-align: left; font-size: 10pt;">Cover Page Interactive Data File (embedded within the Inline XBRL document)</div>
          </td>

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    <div> <br />
    </div>

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        <hr style="margin: 4px 0px; width: 100%; border-width: 0; height: 2px; color: #000000; background-color: #000000; clear: both;" /></div>

    </div>

    <div style="text-align: center; color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 10pt;"><span style="text-decoration: underline;">SIGNATURES</span></div>

    <div style="font-family: 'Times New Roman';"><br />
    </div>

    <div style="text-align: left; text-indent: 72pt; font-family: 'Times New Roman'; font-size: 10pt;">Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the
      undersigned hereunto duly authorized.</div>

    <div style="font-family: 'Times New Roman';"><br />
    </div>

    <table cellspacing="0" cellpadding="0" border="0" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%; border-collapse: collapse; text-align: left; color: #000000;" id="z8cdb2ad571714544a3f8c63b619962a2">


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    <td style="width: 57%; vertical-align: top; font-family: 'Times New Roman';"><br />
          </td>

    <td colspan="3" style="vertical-align: top; font-family: 'Times New Roman';">
            <div style="text-align: left; color: rgb(0, 0, 0); font-size: 10pt;">Merck &amp; Co., Inc.</div>
          </td>

  </tr>

  <tr>

    <td style="width: 57%; vertical-align: top; font-family: 'Times New Roman';"><br />
          </td>

    <td style="width: 3%; vertical-align: top; font-family: 'Times New Roman';"><br />
          </td>

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          </td>

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    <td style="width: 57%; vertical-align: top;">
            <div style="text-align: left; color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 10pt;">Date: February 4, 2021</div>
          </td>

    <td style="width: 3%; vertical-align: top; font-family: 'Times New Roman';">
            <div style="text-align: left; color: rgb(0, 0, 0); font-size: 10pt;">By:</div>
          </td>

    <td style="vertical-align: top; font-family: 'Times New Roman';" colspan="2">
            <div style="text-align: left; font-size: 10pt;">/s/&#160; Jennifer Zachary</div>
          </td>

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    <td style="width: 57%; vertical-align: top; font-family: 'Times New Roman';"><br />
          </td>

    <td style="width: 3%; vertical-align: top; font-family: 'Times New Roman';"><br />
          </td>

    <td style="width: 5%; vertical-align: top; border-top: 2px solid rgb(0, 0, 0); font-family: 'Times New Roman';">
            <div style="text-align: left; color: rgb(0, 0, 0); font-size: 10pt;">Name:<br />
            </div>
          </td>

    <td style="width: 35%; vertical-align: top; border-top: 2px solid rgb(0, 0, 0); font-family: 'Times New Roman';">Jennifer Zachary</td>

  </tr>

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    <td style="width: 57%; vertical-align: top; font-family: 'Times New Roman';"><br />
          </td>

    <td style="width: 3%; vertical-align: top; font-family: 'Times New Roman';"><br />
          </td>

    <td style="width: 5%; vertical-align: top; font-family: 'Times New Roman';">
            <div style="text-align: left; color: rgb(0, 0, 0); font-size: 10pt;">Title:<br />
            </div>
          </td>

    <td style="width: 35%; vertical-align: top; font-family: 'Times New Roman';">Executive Vice President, General Counsel and Corporate Secretary</td>

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<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>brhc10019731_ex99-1.htm
<DESCRIPTION>EXHIBIT 99.1
<TEXT>
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      <div style="text-align: right; font-family: 'Times New Roman'; font-size: 10pt; font-weight: normal;">EXHIBIT 99.1</div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <table cellspacing="0" cellpadding="0" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%; border-collapse: collapse; text-align: left; color: #000000;" id="z8fb0d99bf1e4400493fc9b7e0518c42e">

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            <td style="width: 50%; vertical-align: top;">
              <div style="text-align: left; font-family: 'Times New Roman';"><img src="image00001.jpg"></div>
            </td>
            <td style="width: 50%; vertical-align: bottom; font-family: 'Times New Roman'; font-weight: bold; text-align: right;">
              <div style="font-size: 10pt; font-weight: normal;">News Release</div>
            </td>
          </tr>
          <tr>
            <td colspan="2" rowspan="1" style="width: 50%; vertical-align: top; border-bottom: 2px solid rgb(0, 0, 0);"><br>
            </td>
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              <div style="text-align: left; font-size: 10pt;">Media Contacts:</div>
            </td>
            <td style="width: 20%; vertical-align: top; font-family: 'Times New Roman';">
              <div style="text-align: left; font-size: 10pt;">Patrick Ryan</div>
            </td>
            <td style="width: 30%; vertical-align: top; font-family: 'Times New Roman';">
              <div style="text-align: left; font-size: 10pt;">Investor Contacts:</div>
            </td>
            <td style="width: 30%; vertical-align: top; font-family: 'Times New Roman';">
              <div style="text-align: left; font-size: 10pt;">Peter Dannenbaum</div>
            </td>
          </tr>
          <tr>
            <td rowspan="1" style="width: 20%; vertical-align: top; font-family: 'Times New Roman';"><br>
            </td>
            <td rowspan="1" style="width: 20%; vertical-align: top;">
              <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">(973) 275-7075</div>
            </td>
            <td rowspan="1" style="width: 30%; vertical-align: top; font-family: 'Times New Roman';"><br>
            </td>
            <td rowspan="1" style="width: 30%; vertical-align: top;">
              <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">(908) 740-1037</div>
            </td>
          </tr>
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            <td rowspan="1" style="width: 20%; vertical-align: top; font-family: 'Times New Roman';"><br>
            </td>
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            </td>
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            </td>
            <td rowspan="1" style="width: 30%; vertical-align: top; font-family: 'Times New Roman';"><br>
            </td>
            <td rowspan="1" style="width: 30%; vertical-align: top;">
              <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">Michael DeCarbo</div>
            </td>
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            </td>
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            </td>
            <td rowspan="1" style="width: 30%; vertical-align: top; font-family: 'Times New Roman';"><br>
            </td>
            <td rowspan="1" style="width: 30%; vertical-align: top;">
              <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">(908) 740-1807</div>
            </td>
          </tr>

      </table>
      <div style="text-align: left;"><font style="font-size: 10pt; font-family: 'Times New Roman';"> </font><font style="font-family: 'Times New Roman';"><br>
        </font></div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">Kenneth C. Frazier to Retire as Merck CEO; Board Elects Robert M. Davis as Successor;</div>
      <div style="text-align: center; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">Frazier to Continue as Executive Chairman</div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">KENILWORTH, N.J., Feb. 4, 2021 &#8211; Merck (NYSE: MRK), known as MSD outside the United States and Canada, today announced that Kenneth C. Frazier, chairman and chief
        executive officer, will retire as CEO, effective June 30, 2021.&#160; Mr. Frazier will continue to serve on Merck&#8217;s board of directors as executive chairman, for a transition period to be determined by the board.&#160; The Merck board of directors has
        unanimously elected Robert M. Davis, Merck&#8217;s current <font style="font-size: 10pt; color: rgb(0, 0, 0);">executive vice president, global services and chief financial officer</font>, as chief executive officer, as well as a member of the board,
        effective July 1, 2021. Mr. Davis will become president of Merck, effective April 1, 2021, at which time <font style="font-size: 10pt; color: rgb(33, 33, 33);">the company&#8217;s operating divisions&#8212;Human Health, Animal Health, Manufacturing, and Merck
          Research Laboratories&#8212;will begin reporting to him</font>.</div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">&#8220;The board and I are delighted that Rob will serve as Merck&#8217;s next CEO,&#8221; Mr. Frazier said.&#160; &#8220;He has deep knowledge of our company and industry and has been a valued
        strategic thought partner to me and the Merck senior management team as well as a highly capable finance leader.&#160; Rob has been instrumental in helping Merck take the right actions to adapt to the changing healthcare environment while remaining
        committed to investing in the scientific innovation that we expect will drive our future growth.&#160; His intellect and proven ability to define and articulate strategies that can be translated into clear and focused operational plans that lead to
        successful execution are also critical attributes.&#160; Rob personifies the values and integrity that are essential for a leader of Merck. I am confident that he has the strategic and leadership skills necessary to ensure that the company remains fully
        committed to its core mission of translating cutting-edge science into products and services that save and improve lives while simultaneously adopting new business and operating models that will unlock future value through innovation, digital
        transformation, and efficiency.&#8221;</div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;"> <br>
      </div>
      <div style="clear: both; margin-top: 10pt; margin-bottom: 10pt;" id="DSPFPageBreakArea">
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      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">Les Brun, Merck&#8217;s lead independent director, said, &#8220;On behalf of the entire Merck board, I thank Ken for his strong and highly principled leadership and his commitment to
        the company&#8217;s core values of scientific excellence, business integrity, patient focus and respect for all people.&#160; Ken&#8217;s vision and courage to make difficult changes within Merck, while steadfastly investing in research and development, have
        positioned Merck well for sustainable future growth.&#160; Under Ken&#8217;s leadership, Merck has delivered many innovative lifesaving medicines and vaccines, including KEYTRUDA, GARDASIL 9, and BRIDION, and also focused on other key growth drivers, such as
        Lynparza, Lenvima, and animal health to create long-term value for its shareholders and other stakeholders.</div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">Ken&#8217;s belief in the importance of a strong, values-based culture, and his ability to attract and retain the best talent, will stand as an enduring testament to his
        concern and care for the people whose skill and commitment will be critical to Merck&#8217;s continued success.&#160; These characteristics and accomplishments, coupled with his principled stances on broader public issues, especially those involving
        intolerance and injustice, make his planned retirement felt so personally by every member of the board.&#8221;</div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">&#8220;It has been a privilege to serve as Merck&#8217;s CEO<font style="font-size: 10pt; color: rgb(0, 0, 0);"> for the past decade and to work with the most dedicated and talented
          employees and management team in the industry,&#8221; said Mr. Frazier.&#160; &#8220;As executive chairman, I look forward to collaborating with Rob and our board of directors to help Merck achieve even higher levels of success.&#8221;</font></div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">Mr. Brun added, &#8220;During our succession planning process the board has had an opportunity to witness Rob&#8217;s substantial contributions to the company and the leadership
        team.&#160; He is the right person to lead Merck into the future.&#160; We have tremendous confidence in Rob&#8217;s ability to continue to foster innovation and to team with Dean Li, president of Merck Research Laboratories, to drive scientific excellence into
        the future.&#160; We are particularly pleased that Ken will continue as executive chairman in order to work with Rob and Dean to ensure a smooth transition for the company.&#8221;</div>
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      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">Mr. Davis joined Merck as chief financial officer in 2014. In 2016 his role was expanded to include the company&#8217;s global support functions, which encompass corporate
        business development, investor relations, information technology, procurement, real estate operations, and corporate strategy.</div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">Mr. Davis said, &#8220;I am honored to be appointed the next chief executive officer of Merck.&#160; I thank the board and Ken for their confidence in me.&#160; I plan to continue Ken&#8217;s
        focus on innovation as we aspire to be the premier research-intensive biopharmaceutical company.&#160; This will be a year of great change both for the company and for our industry.&#160; As we work through the pandemic, we will continue to focus on the
        important work of bringing our medicines and vaccines to those who need them.&#160; Merck will not waver in its role of searching for and developing medically necessary products to improve people&#8217;s lives throughout the world.&#8221;</div>
      <div style="font-family: 'Times New Roman';"><br>
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      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">About Robert M. Davis</div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;"> <br>
      </div>
      <div style="text-align: left; color: rgb(68, 68, 68); font-family: 'Times New Roman'; font-size: 10pt;"><font style="background-color: #FEFEFE;">Prior to joining Merck, Mr. Davis was corporate vice president and president of Baxter&#8217;s Medical Products
          business, where he oversaw the successful integration of that company&#8217;s Global Medication Delivery and Renal businesses into a single organization encompassing commercial operations, manufacturing and R&amp;D, laying the foundation for sustained
          growth and a solid R&amp;D pipeline still delivering value today.&#160; Before that, Mr. Davis served as corporate vice president and president of Baxter&#8217;s Renal business, as corporate vice president and chief financial officer from May 2006 through
          May 2010, and as treasurer from 2004 through May 2006. Mr. Davis previously spent more than 14 years at Eli Lilly and Company.</font></div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; color: rgb(68, 68, 68); font-family: 'Times New Roman'; font-size: 10pt;"><font style="background-color: #FEFEFE;">Mr. Davis serves on the board of directors of Duke Energy Corporation and is a member of its compensation
          and finance committees.&#160; In addition, he is a board member of Project Hope, a non-profit organization focused on empowering health care workers to deliver expert care when and where it is needed most.</font></div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; color: rgb(68, 68, 68); font-family: 'Times New Roman'; font-size: 10pt;"><font style="background-color: #FEFEFE;">Mr. Davis received his J.D. from Northwestern University School of Law, his M.B.A. from Northwestern
          University&#8217;s Kellogg Graduate School of Management and his bachelor&#8217;s degree in finance from Miami University.</font></div>
      <div style="text-align: left; color: rgb(68, 68, 68); font-family: 'Times New Roman'; font-size: 10pt;"><font style="background-color: #FEFEFE;"> <br>
        </font></div>
      <div style="clear: both; margin-top: 10pt; margin-bottom: 10pt;" id="DSPFPageBreakArea">
        <div style="page-break-after:always;" id="DSPFPageBreak">
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      <div style="text-align: left; color: rgb(68, 68, 68); font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;"><font style="background-color: #FEFEFE;">About Kenneth C. Frazier</font></div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">Mr. Frazier joined Merck in 1992 as vice president, general counsel and secretary of the Astra Merck group.&#160; He was appointed as vice president of public affairs in 1994,
        and then in 1997 he assumed the additional responsibilities of assistant general counsel, corporate staff.&#160; Mr. Frazier was promoted to vice president and deputy general counsel in January 1999.&#160; In December 1999, he became senior vice president
        and general counsel.&#160; In November 2006, he was promoted to executive vice president and general counsel.&#160; Mr. Frazier served as executive vice president and president, Global Human Health, from 2007 to 2010.&#160; He was named president of Merck in May
        2010.&#160; Mr. Frazier became Merck&#8217;s chief executive officer and a member of its board in January 2011.&#160; He became chairman of the board on December 1, 2011.</div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">He sits on the boards of PhRMA, Weill Cornell Medicine, Exxon Mobil Corporation<font style="font-size: 10pt; font-weight: bold;">,</font> Catalyst and Cornerstone
        Christian Academy in Philadelphia, PA.&#160; He is co-founder and co-chair of OneTen, a coalition of leading organizations committed to upskilling, hiring, and promoting one million Black Americans into family-sustaining jobs.&#160; Mr. Frazier also is a
        member of the American Academy of Arts and Sciences, the American Philosophical Society, The Business Council, the Council of the American Law Institute, and the American Bar Association.&#160; Additionally, Mr. Frazier is co-chair of the Legal Services
        Corporation&#8217;s Leaders Council.</div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">As a strong advocate for social justice and economic inclusion, Mr. Frazier is the recipient of numerous awards and honors, including the Anti-Defamation League Courage
        Against Hate Award, the Botwinick Prize in Business Ethics from Columbia Business School, the Legend in Leadership Award from the Yale School of Management, the NAACP Legal Defense and Educational Fund National Equal Justice Award, and the National
        Minority Quality Forum&#8217;s Lifetime Achievement Award.&#160; In 2018, Mr. Frazier was named one of the World&#8217;s Greatest Leaders by Fortune Magazine and also was named to the Time 100 Most Influential People.&#160; In 2019, he became the first recipient of the
        Forbes Lifetime Achievement Award for Healthcare.</div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;">Mr. Frazier received his bachelor&#8217;s degree from The Pennsylvania State University and holds a J.D. from Harvard Law School.</div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt;"> <br>
      </div>
      <div style="clear: both; margin-top: 10pt; margin-bottom: 10pt;" id="DSPFPageBreakArea">
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      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">Earnings Conference Call</div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;"> <br>
      </div>
      <div style="text-align: left; text-indent: 36pt; font-family: 'Times New Roman'; font-size: 10pt;">Investors, journalists and the general public may access a live audio webcast of Merck&#8217;s earnings call today at 8:00 a.m. EST on Merck&#8217;s website at <u><font style="font-size: 10pt;">https://www.merck.com/investor-relations/events-and-presentations/</font></u>. Institutional investors and analysts can participate in the call by dialing (833) 353-0277 or (469) 886-1947 and using ID code number
        2268598. Members of the media are invited to monitor the call by dialing (833) 353-0277 or (469) 886-1947 and using ID code number 2268598. Journalists who wish to ask questions are requested to contact a member of Merck&#8217;s Media Relations team at
        the conclusion of the call.</div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">About Merck</div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;"> <br>
      </div>
      <div style="font-family: 'Times New Roman';">
        <div style="text-align: left; text-indent: 36pt; font-size: 10pt;">For 130 years, Merck, known as MSD outside of the United States and Canada, has been inventing for life, bringing forward medicines and vaccines for many of the world&#8217;s most
          challenging diseases in pursuit of our mission to save and improve lives. We demonstrate our commitment to patients and population health by increasing access to health care through far-reaching policies, programs and partnerships. Today, Merck
          continues to be at the forefront of research to prevent and treat diseases that threaten people and animals &#8211; including cancer, infectious diseases such as HIV and Ebola, and emerging animal diseases &#8211; as we aspire to be the premier
          research-intensive biopharmaceutical company in the world. For more information, visit <u><font style="font-size: 10pt;">www.merck.com</font></u> and connect with us on <u><font style="font-size: 10pt;">Twitter</font></u>, <u><font style="font-size: 10pt;">Facebook</font></u>, <u><font style="font-size: 10pt;">Instagram</font></u>, <u><font style="font-size: 10pt;">YouTube</font></u> and <u><font style="font-size: 10pt;">LinkedIn</font></u><font style="font-size: 10pt;">.</font></div>
      </div>
      <div style="font-family: 'Times New Roman';"><br>
      </div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">Forward-Looking Statement of Merck &amp; Co., Inc., Kenilworth, N.J., USA</div>
      <div style="text-align: left; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;"> <br>
      </div>
      <div style="text-align: left; text-indent: 36pt; font-family: 'Times New Roman'; font-size: 10pt;">This news release of Merck &amp; Co., Inc., Kenilworth, N.J., USA (the &#8220;company&#8221;) includes &#8220;forward-looking statements&#8221; within the meaning of the safe
        harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. These statements are based upon the current beliefs and expectations of the company&#8217;s management and are subject to significant risks and uncertainties. There can be no
        guarantees with respect to pipeline products that the products will receive the necessary regulatory approvals or that they will prove to be commercially successful. If underlying assumptions prove inaccurate or risks or uncertainties materialize,
        actual results may differ materially from those set forth in the forward-looking statements.</div>
      <div style="text-align: left; text-indent: 36pt; font-family: 'Times New Roman'; font-size: 10pt;"> <br>
      </div>
      <div style="text-align: left; text-indent: 36pt; font-family: 'Times New Roman'; font-size: 10pt;">Risks and uncertainties include but are not limited to, general industry conditions and competition; general economic factors, including interest rate
        and currency exchange rate fluctuations; the impact of the global outbreak of novel coronavirus disease (COVID-19); the impact of pharmaceutical industry regulation and health care legislation in the United States and internationally; global trends
        toward health care cost containment; technological advances, new products and patents attained by competitors; challenges inherent in new product development, including obtaining regulatory approval; the company&#8217;s ability to accurately predict
        future market conditions; manufacturing difficulties or delays; financial instability of international economies and sovereign risk; dependence on the effectiveness of the company&#8217;s patents and other protections for innovative products; and the
        exposure to litigation, including patent litigation, and/or regulatory actions.</div>
      <div style="text-align: left; text-indent: 36pt; font-family: 'Times New Roman'; font-size: 10pt;"> <br>
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      <div style="clear: both; margin-top: 10pt; margin-bottom: 10pt;" id="DSPFPageBreakArea">
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      <div style="text-align: left; text-indent: 36pt; font-family: 'Times New Roman'; font-size: 10pt;">The company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or
        otherwise. Additional factors that could cause results to differ materially from those described in the forward-looking statements can be found in the company&#8217;s 2019 Annual Report on Form 10-K and the company&#8217;s other filings with the Securities and
        Exchange Commission (SEC) available at the SEC&#8217;s Internet site (<u><font style="font-size: 10pt;">www.sec.gov</font></u>).</div>
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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.LAB
<SEQUENCE>5
<FILENAME>mrk-20210201_lab.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
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<XBRL>
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    <link:label xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityAddressAddressLine1_lbl" xml:lang="en-US" id="dei_EntityAddressAddressLine1_lbl">Entity Address, Address Line One</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityAddressAddressLine1" xlink:to="dei_EntityAddressAddressLine1_lbl" xlink:title="label: EntityAddressAddressLine1 to dei_EntityAddressAddressLine1_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine2" xlink:label="EntityAddressAddressLine2" xlink:title="EntityAddressAddressLine2" />
    <link:label xlink:type="resource" xlink:label="dei_EntityAddressAddressLine2_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityAddressAddressLine2_lbl" xml:lang="en-US" id="dei_EntityAddressAddressLine2_lbl">Entity Address, Address Line Two</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityAddressAddressLine2" xlink:to="dei_EntityAddressAddressLine2_lbl" xlink:title="label: EntityAddressAddressLine2 to dei_EntityAddressAddressLine2_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine3" xlink:label="EntityAddressAddressLine3" xlink:title="EntityAddressAddressLine3" />
    <link:label xlink:type="resource" xlink:label="dei_EntityAddressAddressLine3_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityAddressAddressLine3_lbl" xml:lang="en-US" id="dei_EntityAddressAddressLine3_lbl">Entity Address, Address Line Three</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityAddressAddressLine3" xlink:to="dei_EntityAddressAddressLine3_lbl" xlink:title="label: EntityAddressAddressLine3 to dei_EntityAddressAddressLine3_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_AmendmentFlag" xlink:label="AmendmentFlag" xlink:title="AmendmentFlag" />
    <link:label xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_AmendmentFlag_lbl" xml:lang="en-US" id="dei_AmendmentFlag_lbl">Amendment Flag</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AmendmentFlag" xlink:to="dei_AmendmentFlag_lbl" xlink:title="label: AmendmentFlag to dei_AmendmentFlag_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode" xlink:label="CityAreaCode" xlink:title="CityAreaCode" />
    <link:label xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_CityAreaCode_lbl" xml:lang="en-US" id="dei_CityAreaCode_lbl">City Area Code</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CityAreaCode" xlink:to="dei_CityAreaCode_lbl" xlink:title="label: CityAreaCode to dei_CityAreaCode_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown" xlink:label="EntityAddressCityOrTown" xlink:title="EntityAddressCityOrTown" />
    <link:label xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityAddressCityOrTown_lbl" xml:lang="en-US" id="dei_EntityAddressCityOrTown_lbl">Entity Address, City or Town</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityAddressCityOrTown" xlink:to="dei_EntityAddressCityOrTown_lbl" xlink:title="label: EntityAddressCityOrTown to dei_EntityAddressCityOrTown_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCountry" xlink:label="EntityAddressCountry" xlink:title="EntityAddressCountry" />
    <link:label xlink:type="resource" xlink:label="dei_EntityAddressCountry_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityAddressCountry_lbl" xml:lang="en-US" id="dei_EntityAddressCountry_lbl">Entity Address, Country</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityAddressCountry" xlink:to="dei_EntityAddressCountry_lbl" xlink:title="label: EntityAddressCountry to dei_EntityAddressCountry_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="DocumentPeriodEndDate" xlink:title="DocumentPeriodEndDate" />
    <link:label xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US" id="dei_DocumentPeriodEndDate_lbl">Document Period End Date</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate_lbl" xlink:title="label: DocumentPeriodEndDate to dei_DocumentPeriodEndDate_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="EntityIncorporationStateCountryCode" xlink:title="EntityIncorporationStateCountryCode" />
    <link:label xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityIncorporationStateCountryCode_lbl" xml:lang="en-US" id="dei_EntityIncorporationStateCountryCode_lbl">Entity Incorporation, State or Country Code</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityIncorporationStateCountryCode" xlink:to="dei_EntityIncorporationStateCountryCode_lbl" xlink:title="label: EntityIncorporationStateCountryCode to dei_EntityIncorporationStateCountryCode_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityListingsTable" xlink:label="EntityListingsTable" xlink:title="EntityListingsTable" />
    <link:label xlink:type="resource" xlink:label="dei_EntityListingsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityListingsTable_lbl" xml:lang="en-US" id="dei_EntityListingsTable_lbl">Entity Listings [Table]</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityListingsTable" xlink:to="dei_EntityListingsTable_lbl" xlink:title="label: EntityListingsTable to dei_EntityListingsTable_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber" xlink:label="LocalPhoneNumber" xlink:title="LocalPhoneNumber" />
    <link:label xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_LocalPhoneNumber_lbl" xml:lang="en-US" id="dei_LocalPhoneNumber_lbl">Local Phone Number</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="LocalPhoneNumber" xlink:to="dei_LocalPhoneNumber_lbl" xlink:title="label: LocalPhoneNumber to dei_LocalPhoneNumber_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode" xlink:label="EntityAddressPostalZipCode" xlink:title="EntityAddressPostalZipCode" />
    <link:label xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityAddressPostalZipCode_lbl" xml:lang="en-US" id="dei_EntityAddressPostalZipCode_lbl">Entity Address, Postal Zip Code</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityAddressPostalZipCode" xlink:to="dei_EntityAddressPostalZipCode_lbl" xlink:title="label: EntityAddressPostalZipCode to dei_EntityAddressPostalZipCode_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince" xlink:label="EntityAddressStateOrProvince" xlink:title="EntityAddressStateOrProvince" />
    <link:label xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityAddressStateOrProvince_lbl" xml:lang="en-US" id="dei_EntityAddressStateOrProvince_lbl">Entity Address, State or Province</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityAddressStateOrProvince" xlink:to="dei_EntityAddressStateOrProvince_lbl" xlink:title="label: EntityAddressStateOrProvince to dei_EntityAddressStateOrProvince_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12bTitle" xlink:label="Security12bTitle" xlink:title="Security12bTitle" />
    <link:label xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_Security12bTitle_lbl" xml:lang="en-US" id="dei_Security12bTitle_lbl">Title of 12(b) Security</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="Security12bTitle" xlink:to="dei_Security12bTitle_lbl" xlink:title="label: Security12bTitle to dei_Security12bTitle_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_NoTradingSymbolFlag" xlink:label="NoTradingSymbolFlag" xlink:title="NoTradingSymbolFlag" />
    <link:label xlink:type="resource" xlink:label="dei_NoTradingSymbolFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_NoTradingSymbolFlag_lbl" xml:lang="en-US" id="dei_NoTradingSymbolFlag_lbl">No Trading Symbol Flag</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NoTradingSymbolFlag" xlink:to="dei_NoTradingSymbolFlag_lbl" xlink:title="label: NoTradingSymbolFlag to dei_NoTradingSymbolFlag_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol" xlink:label="TradingSymbol" xlink:title="TradingSymbol" />
    <link:label xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_TradingSymbol_lbl" xml:lang="en-US" id="dei_TradingSymbol_lbl">Trading Symbol</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TradingSymbol" xlink:to="dei_TradingSymbol_lbl" xlink:title="label: TradingSymbol to dei_TradingSymbol_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName" xlink:label="SecurityExchangeName" xlink:title="SecurityExchangeName" />
    <link:label xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_SecurityExchangeName_lbl" xml:lang="en-US" id="dei_SecurityExchangeName_lbl">Security Exchange Name</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SecurityExchangeName" xlink:to="dei_SecurityExchangeName_lbl" xlink:title="label: SecurityExchangeName to dei_SecurityExchangeName_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityListingsLineItems" xlink:label="EntityListingsLineItems" xlink:title="EntityListingsLineItems" />
    <link:label xlink:type="resource" xlink:label="dei_EntityListingsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityListingsLineItems_lbl" xml:lang="en-US" id="dei_EntityListingsLineItems_lbl">Entity Listings [Line Items]</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityListingsLineItems" xlink:to="dei_EntityListingsLineItems_lbl" xlink:title="label: EntityListingsLineItems to dei_EntityListingsLineItems_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName" xlink:label="EntityRegistrantName" xlink:title="EntityRegistrantName" />
    <link:label xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityRegistrantName_lbl" xml:lang="en-US" id="dei_EntityRegistrantName_lbl">Entity Registrant Name</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityRegistrantName" xlink:to="dei_EntityRegistrantName_lbl" xlink:title="label: EntityRegistrantName to dei_EntityRegistrantName_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="EntityCentralIndexKey" xlink:title="EntityCentralIndexKey" />
    <link:label xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityCentralIndexKey_lbl" xml:lang="en-US" id="dei_EntityCentralIndexKey_lbl">Entity Central Index Key</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey_lbl" xlink:title="label: EntityCentralIndexKey to dei_EntityCentralIndexKey_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityTaxIdentificationNumber" xlink:label="EntityTaxIdentificationNumber" xlink:title="EntityTaxIdentificationNumber" />
    <link:label xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityTaxIdentificationNumber_lbl" xml:lang="en-US" id="dei_EntityTaxIdentificationNumber_lbl">Entity Tax Identification Number</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityTaxIdentificationNumber" xlink:to="dei_EntityTaxIdentificationNumber_lbl" xlink:title="label: EntityTaxIdentificationNumber to dei_EntityTaxIdentificationNumber_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="DocumentFiscalYearFocus" xlink:title="DocumentFiscalYearFocus" />
    <link:label xlink:type="resource" xlink:label="dei_DocumentFiscalYearFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US" id="dei_DocumentFiscalYearFocus_lbl">Document Fiscal Year Focus</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="DocumentFiscalYearFocus" xlink:to="dei_DocumentFiscalYearFocus_lbl" xlink:title="label: DocumentFiscalYearFocus to dei_DocumentFiscalYearFocus_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="DocumentFiscalPeriodFocus" xlink:title="DocumentFiscalPeriodFocus" />
    <link:label xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US" id="dei_DocumentFiscalPeriodFocus_lbl">Document Fiscal Period Focus</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus_lbl" xlink:title="label: DocumentFiscalPeriodFocus to dei_DocumentFiscalPeriodFocus_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType" xlink:label="DocumentType" xlink:title="DocumentType" />
    <link:label xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_DocumentType_lbl" xml:lang="en-US" id="dei_DocumentType_lbl">Document Type</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="DocumentType" xlink:to="dei_DocumentType_lbl" xlink:title="label: DocumentType to dei_DocumentType_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_WrittenCommunications" xlink:label="WrittenCommunications" xlink:title="WrittenCommunications" />
    <link:label xlink:type="resource" xlink:label="dei_WrittenCommunications_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_WrittenCommunications_lbl" xml:lang="en-US" id="dei_WrittenCommunications_lbl">Written Communications</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="WrittenCommunications" xlink:to="dei_WrittenCommunications_lbl" xlink:title="label: WrittenCommunications to dei_WrittenCommunications_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SolicitingMaterial" xlink:label="SolicitingMaterial" xlink:title="SolicitingMaterial" />
    <link:label xlink:type="resource" xlink:label="dei_SolicitingMaterial_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_SolicitingMaterial_lbl" xml:lang="en-US" id="dei_SolicitingMaterial_lbl">Soliciting Material</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SolicitingMaterial" xlink:to="dei_SolicitingMaterial_lbl" xlink:title="label: SolicitingMaterial to dei_SolicitingMaterial_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_PreCommencementTenderOffer" xlink:label="PreCommencementTenderOffer" xlink:title="PreCommencementTenderOffer" />
    <link:label xlink:type="resource" xlink:label="dei_PreCommencementTenderOffer_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_PreCommencementTenderOffer_lbl" xml:lang="en-US" id="dei_PreCommencementTenderOffer_lbl">Pre-commencement Tender Offer</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PreCommencementTenderOffer" xlink:to="dei_PreCommencementTenderOffer_lbl" xlink:title="label: PreCommencementTenderOffer to dei_PreCommencementTenderOffer_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_PreCommencementIssuerTenderOffer" xlink:label="PreCommencementIssuerTenderOffer" xlink:title="PreCommencementIssuerTenderOffer" />
    <link:label xlink:type="resource" xlink:label="dei_PreCommencementIssuerTenderOffer_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_PreCommencementIssuerTenderOffer_lbl" xml:lang="en-US" id="dei_PreCommencementIssuerTenderOffer_lbl">Pre-commencement Issuer Tender Offer</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PreCommencementIssuerTenderOffer" xlink:to="dei_PreCommencementIssuerTenderOffer_lbl" xlink:title="label: PreCommencementIssuerTenderOffer to dei_PreCommencementIssuerTenderOffer_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFileNumber" xlink:label="EntityFileNumber" xlink:title="EntityFileNumber" />
    <link:label xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityFileNumber_lbl" xml:lang="en-US" id="dei_EntityFileNumber_lbl">Entity File Number</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityFileNumber" xlink:to="dei_EntityFileNumber_lbl" xlink:title="label: EntityFileNumber to dei_EntityFileNumber_lbl" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="EntityEmergingGrowthCompany" xlink:title="EntityEmergingGrowthCompany" />
    <link:label xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="dei_EntityEmergingGrowthCompany_lbl" xml:lang="en-US" id="dei_EntityEmergingGrowthCompany_lbl">Entity Emerging Growth Company</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EntityEmergingGrowthCompany" xlink:to="dei_EntityEmergingGrowthCompany_lbl" xlink:title="label: EntityEmergingGrowthCompany to dei_EntityEmergingGrowthCompany_lbl" />
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<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>6
<FILENAME>mrk-20210201_pre.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
<TEXT>
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                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:CommonStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-02-01</startDate>
            <endDate>2021-02-01</endDate>
        </period>
    </context>
    <context id="c20210201to20210201_StatementClassOfStockAxis_One125NotesDue2021Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000310158</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">mrk:One125NotesDue2021Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-02-01</startDate>
            <endDate>2021-02-01</endDate>
        </period>
    </context>
    <context id="c20210201to20210201_StatementClassOfStockAxis_Zero500NotesDue2024Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000310158</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">mrk:Zero500NotesDue2024Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-02-01</startDate>
            <endDate>2021-02-01</endDate>
        </period>
    </context>
    <context id="c20210201to20210201_StatementClassOfStockAxis_One875NotesDue2026Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000310158</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">mrk:One875NotesDue2026Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-02-01</startDate>
            <endDate>2021-02-01</endDate>
        </period>
    </context>
    <context id="c20210201to20210201_StatementClassOfStockAxis_Two500NotesDue2034Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000310158</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">mrk:Two500NotesDue2034Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-02-01</startDate>
            <endDate>2021-02-01</endDate>
        </period>
    </context>
    <context id="c20210201to20210201_StatementClassOfStockAxis_One375NotesDue2036Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000310158</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">mrk:One375NotesDue2036Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-02-01</startDate>
            <endDate>2021-02-01</endDate>
        </period>
    </context>
    <dei:AmendmentFlag
      contextRef="c20210201to20210201"
      id="Fact_6822c1af8e6a44c3a8c29f90ab0917f6">false</dei:AmendmentFlag>
    <dei:EntityFileNumber
      contextRef="c20210201to20210201"
      id="Fact_2d9284f8b3c444d3bc788368bd5519d9">001-06571</dei:EntityFileNumber>
    <dei:EntityAddressAddressLine1
      contextRef="c20210201to20210201"
      id="Fact_c3cb6259e8f644dba35179d1685207e5">2000 GALLOPING HILL ROAD</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown
      contextRef="c20210201to20210201"
      id="Fact_be9cb74e28f64d59acec0a40c19cf146">KENILWORTH</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="c20210201to20210201"
      id="Fact_09a6a62b03b54696adf4a9f3504d0a19">NJ</dei:EntityAddressStateOrProvince>
    <dei:EntityCentralIndexKey
      contextRef="c20210201to20210201"
      id="Fact_19f01d8f031e403ca684ea9afc6f9f4b">0000310158</dei:EntityCentralIndexKey>
    <dei:DocumentType
      contextRef="c20210201to20210201"
      id="Fact_53938ba7fb394023a8833433a78301b5">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="c20210201to20210201"
      id="Fact_06e9ad8da3cb4900bfc835922f74c1ec">2021-02-01</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="c20210201to20210201"
      id="Fact_3852c776439d433aa711d9cd05a59a42">Merck &amp; Co., Inc.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="c20210201to20210201"
      id="Fact_74f6b47cc8924751a87d8260a318d561">NJ</dei:EntityIncorporationStateCountryCode>
    <dei:EntityTaxIdentificationNumber
      contextRef="c20210201to20210201"
      id="Fact_97096ba795c544eea18b528f0a89cb55">22-1918501</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressPostalZipCode
      contextRef="c20210201to20210201"
      id="Fact_0a05fc3027154203888fc43695671278">07033</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="c20210201to20210201"
      id="Fact_47694a3c011649c08df766f036512023">908</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="c20210201to20210201"
      id="Fact_068cf4f6a0f24ecf94cc4df0eb516ed0">740-4000</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="c20210201to20210201"
      id="Fact_28f8feec457c4f97bb9f5d22f6e1dff1">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="c20210201to20210201"
      id="Fact_42ad350684764f489bb243d20e6af287">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="c20210201to20210201"
      id="Fact_74c82c5abcfc42319cb6a13addd40d3c">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="c20210201to20210201"
      id="Fact_b7375333fea8477a916b85bbddd376a7">false</dei:PreCommencementIssuerTenderOffer>
    <dei:EntityEmergingGrowthCompany
      contextRef="c20210201to20210201"
      id="Fact_abbe0234bb5e4421b63af40fcf73b9f2">false</dei:EntityEmergingGrowthCompany>
    <dei:Security12bTitle
      contextRef="c20210201to20210201_StatementClassOfStockAxis_CommonStockMember"
      id="Fact_0cce5d35d0f84c8b9c5744a549166a22">Common Stock ($0.50 par value)</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="c20210201to20210201_StatementClassOfStockAxis_CommonStockMember"
      id="Fact_bf4c68b561634048b6e5191a5bab48f4">MRK</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="c20210201to20210201_StatementClassOfStockAxis_CommonStockMember"
      id="Fact_1d71418d6b074809a65bef851b7106ca">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="c20210201to20210201_StatementClassOfStockAxis_One125NotesDue2021Member"
      id="Fact_851cb23632b945dd987792e2e15cbcce">1.125% Notes due 2021</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="c20210201to20210201_StatementClassOfStockAxis_One125NotesDue2021Member"
      id="Fact_64d12c6e78664c699da30af49eaba1af">MRK/21</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="c20210201to20210201_StatementClassOfStockAxis_One125NotesDue2021Member"
      id="Fact_2692755b7b4b483284cc14d919611136">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="c20210201to20210201_StatementClassOfStockAxis_Zero500NotesDue2024Member"
      id="Fact_5578c059367048289db81853ce230ec0">0.500% Notes due 2024</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="c20210201to20210201_StatementClassOfStockAxis_Zero500NotesDue2024Member"
      id="Fact_f626e6bf567642ad8b93b802d83910b5">MRK24</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="c20210201to20210201_StatementClassOfStockAxis_Zero500NotesDue2024Member"
      id="Fact_c8d871b42d8541fe86a64c6f60da1ce8">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="c20210201to20210201_StatementClassOfStockAxis_One875NotesDue2026Member"
      id="Fact_8f46ea762eae473b879ac69e619150e5">1.875% Notes due 2026</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="c20210201to20210201_StatementClassOfStockAxis_One875NotesDue2026Member"
      id="Fact_b69a1465d31f408783029071bb1b8e03">MRK/26</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="c20210201to20210201_StatementClassOfStockAxis_One875NotesDue2026Member"
      id="Fact_436fb3d7a13a442b83e0d73345b5b438">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="c20210201to20210201_StatementClassOfStockAxis_Two500NotesDue2034Member"
      id="Fact_6002324e952c4800afdd5ad16d2a7926">2.500% Notes due 2034</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="c20210201to20210201_StatementClassOfStockAxis_Two500NotesDue2034Member"
      id="Fact_427659a5af154f8089d11dcf81daef93">MRK/34</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="c20210201to20210201_StatementClassOfStockAxis_Two500NotesDue2034Member"
      id="Fact_c7d98a4ec5fb49eebae574f7560399fb">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="c20210201to20210201_StatementClassOfStockAxis_One375NotesDue2036Member"
      id="Fact_c1f6492fe3684a959e58909c80b0d5fe">1.375% Notes due 2036</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="c20210201to20210201_StatementClassOfStockAxis_One375NotesDue2036Member"
      id="Fact_e4bba46e41fc45e991bd46dfde327246">MRK36A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="c20210201to20210201_StatementClassOfStockAxis_One375NotesDue2036Member"
      id="Fact_ceefdc1f501140ca927be379f580e8be">NYSE</dei:SecurityExchangeName>
</xbrl>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>9
<FILENAME>R1.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
							if (e.nextSibling.style.display=='none') {
							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
							}</script>
</head>
<body>
<span style="display: none;">v3.20.4</span><table class="report" border="0" cellspacing="2" id="idm140644437687736">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Document and Entity Information<br></strong></div></th>
<th class="th"><div>Feb. 01, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityListingsLineItems', window );"><strong>Entity Listings [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">8-K<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentPeriodEndDate', window );">Document Period End Date</a></td>
<td class="text">Feb.  01,  2021<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">Merck & Co., Inc.<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityIncorporationStateCountryCode', window );">Entity Incorporation, State or Country Code</a></td>
<td class="text">NJ<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityFileNumber', window );">Entity File Number</a></td>
<td class="text">001-06571<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityTaxIdentificationNumber', window );">Entity Tax Identification Number</a></td>
<td class="text">22-1918501<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressAddressLine1', window );">Entity Address, Address Line One</a></td>
<td class="text">2000 GALLOPING HILL ROAD<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressCityOrTown', window );">Entity Address, City or Town</a></td>
<td class="text">KENILWORTH<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity Address, State or Province</a></td>
<td class="text">NJ<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity Address, Postal Zip Code</a></td>
<td class="text">07033<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
<td class="text">908<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_LocalPhoneNumber', window );">Local Phone Number</a></td>
<td class="text">740-4000<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_WrittenCommunications', window );">Written Communications</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SolicitingMaterial', window );">Soliciting Material</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementTenderOffer', window );">Pre-commencement Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementIssuerTenderOffer', window );">Pre-commencement Issuer Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityEmergingGrowthCompany', window );">Entity Emerging Growth Company</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0000310158<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember', window );">Common Stock [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityListingsLineItems', window );"><strong>Entity Listings [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">Common Stock ($0.50 par value)<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">MRK<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementClassOfStockAxis=mrk_One125NotesDue2021Member', window );">1.125% Notes due 2021 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityListingsLineItems', window );"><strong>Entity Listings [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">1.125% Notes due 2021<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">MRK/21<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementClassOfStockAxis=mrk_Zero500NotesDue2024Member', window );">0.500% Notes due 2024 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityListingsLineItems', window );"><strong>Entity Listings [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">0.500% Notes due 2024<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">MRK24<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementClassOfStockAxis=mrk_One875NotesDue2026Member', window );">1.875% Notes due 2026 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityListingsLineItems', window );"><strong>Entity Listings [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">1.875% Notes due 2026<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">MRK/26<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementClassOfStockAxis=mrk_Two500NotesDue2034Member', window );">2.500% Notes due 2034 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityListingsLineItems', window );"><strong>Entity Listings [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">2.500% Notes due 2034<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">MRK/34<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_us-gaap_StatementClassOfStockAxis=mrk_One375NotesDue2036Member', window );">1.375% Notes due 2036 [Member]</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityListingsLineItems', window );"><strong>Entity Listings [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">1.375% Notes due 2036<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">MRK36A<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_AmendmentFlag">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_AmendmentFlag</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CityAreaCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Area code of city</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CityAreaCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentPeriodEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentPeriodEndDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentType">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentType</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:submissionTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 1 such as Attn, Building Name, Street Name</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressCityOrTown">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressCityOrTown</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressPostalZipCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressPostalZipCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressStateOrProvince">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressStateOrProvince</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:stateOrProvinceItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:centralIndexKeyItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFileNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFileNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:fileNumberItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityIncorporationStateCountryCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Two-character EDGAR code representing the state or country of incorporation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityIncorporationStateCountryCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarStateCountryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityListingsLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityListingsLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
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<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityTaxIdentificationNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityTaxIdentificationNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LocalPhoneNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LocalPhoneNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<tr>
<td><strong> Data Type:</strong></td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementIssuerTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 13e<br> -Subsection 4c<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementIssuerTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 14d<br> -Subsection 2b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_Security12bTitle">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_Security12bTitle</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SecurityExchangeName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the Exchange on which a security is registered.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection d1-1<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SecurityExchangeName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarExchangeCodeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SolicitingMaterial">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Section 14a<br> -Number 240<br> -Subsection 12<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SolicitingMaterial</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_TradingSymbol">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Trading symbol of an instrument as listed on an exchange.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_TradingSymbol</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:tradingSymbolItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_WrittenCommunications">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br> -Section 425<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_WrittenCommunications</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementClassOfStockAxis=mrk_One125NotesDue2021Member</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<td><strong> Balance Type:</strong></td>
<td></td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementClassOfStockAxis=mrk_One875NotesDue2026Member</td>
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<td><strong> Data Type:</strong></td>
<td>na</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
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 "std_ref": {
  "r0": {
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   "Publisher": "SEC",
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   "Subsection": "b"
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  "r1": {
   "Name": "Exchange Act",
   "Number": "240",
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   "Section": "12",
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}
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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
