    <SEC-DOCUMENT>0001829126-25-001664-index.html : 20250310
    <SEC-HEADER>0001829126-25-001664.hdr.sgml : 20250310
    <ACCEPTANCE-DATETIME>20250310172422
    ACCESSION NUMBER:		0001829126-25-001664
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		22
    CONFORMED PERIOD OF REPORT:	20241231
    FILED AS OF DATE:		20250310
    DATE AS OF CHANGE:		20250310
    EFFECTIVENESS DATE:		20250310

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			GABELLI MULTIMEDIA TRUST INC.
    		CENTRAL INDEX KEY:			0000921671
    		ORGANIZATION NAME:
    		IRS NUMBER:				133767317
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-08476
    		FILM NUMBER:		25724960

    	BUSINESS ADDRESS:
    		STREET 1:		ONE CORPORATE CENTER
    		CITY:			RYE
    		STATE:			NY
    		ZIP:			10580-1434
    		BUSINESS PHONE:		9149215070

    	MAIL ADDRESS:
    		STREET 1:		ONE CORPORATE CENTER
    		CITY:			RYE
    		STATE:			NY
    		ZIP:			10580-1434

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	GABELLI GLOBAL MULTIMEDIA TRUST INC
    		DATE OF NAME CHANGE:	19940414
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>ggt_ncsr.htm
    <DESCRIPTION>N-CSR
    <TEXT>
    Document 1 - file: ggt_ncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CODE ETH
    <SEQUENCE>2
    <FILENAME>ggt_ex99codeeth.htm
    <DESCRIPTION>EXHIBIT 99.CODE ETH
    <TEXT>
    Document 2 - file: ggt_ex99codeeth.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>3
    <FILENAME>ggt_ex99cert.htm
    <DESCRIPTION>EXHIBIT 99.CERT
    <TEXT>
    Document 3 - file: ggt_ex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(A)(3)(2)
    <SEQUENCE>4
    <FILENAME>ggt_ex99a32.htm
    <DESCRIPTION>EXHIBIT (A)(3)(2)
    <TEXT>
    Document 4 - file: ggt_ex99a32.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906 CERT
    <SEQUENCE>5
    <FILENAME>ggt_ex99-906cert.htm
    <DESCRIPTION>EXHIBIT 99.906 CERT
    <TEXT>
    Document 5 - file: ggt_ex99-906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>ggt_001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: ggt_001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>ggt_002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: ggt_002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>ggt_003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: ggt_003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>ggt_back.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: ggt_back.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>10
    <FILENAME>ggt-20241231.xsd
    <DESCRIPTION>XBRL SCHEMA FILE
    <TEXT>
    Document 10 - file: ggt-20241231.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>11
    <FILENAME>ggt-20241231_def.xml
    <DESCRIPTION>XBRL DEFINITION FILE
    <TEXT>
    Document 11 - file: ggt-20241231_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>12
    <FILENAME>ggt-20241231_lab.xml
    <DESCRIPTION>XBRL LABEL FILE
    <TEXT>
    Document 12 - file: ggt-20241231_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>13
    <FILENAME>ggt-20241231_pre.xml
    <DESCRIPTION>XBRL PRESENTATION FILE
    <TEXT>
    Document 13 - file: ggt-20241231_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>15
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 15 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>16
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 16 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>17
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 17 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>18
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 18 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>20
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 20 - file: FilingSummary.html

    Document 20 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>22
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 22 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>23
    <FILENAME>0001829126-25-001664-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 23 - file: 0001829126-25-001664-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>24
    <FILENAME>ggt_ncsr_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 24 - file: ggt_ncsr_htm.html

    Document 24 - RAW XML: ggt_ncsr_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>