<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>1009</ContextCount>
  <ElementCount>606</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>163</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>13</UnitCount>
  <MyReports>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - COVER</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/COVER</Role>
      <ShortName>COVER</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - AUDIT INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/AUDITINFORMATION</Role>
      <ShortName>AUDIT INFORMATION</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952151 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952153 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952154 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSSINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952155 - Statement - CONSOLIDATED STATEMENT OF EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDSTATEMENTOFEQUITYANDREDEEMABLENONCONTROLLINGINTERESTS</Role>
      <ShortName>CONSOLIDATED STATEMENT OF EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952156 - Statement - CONSOLIDATED STATEMENT OF EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDSTATEMENTOFEQUITYANDREDEEMABLENONCONTROLLINGINTERESTSParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENT OF EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952157 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952158 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDBALANCESHEETS_1</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952159 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDBALANCESHEETSParenthetical_1</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952160 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS_1</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952161 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSSINCOME_1</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952162 - Statement - CONSOLIDATED STATEMENT OF EQUITY (DEFICIT) AND REDEEMABLE NONCONTROLLING INTERESTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDSTATEMENTOFEQUITYDEFICITANDREDEEMABLENONCONTROLLINGINTERESTS</Role>
      <ShortName>CONSOLIDATED STATEMENT OF EQUITY (DEFICIT) AND REDEEMABLE NONCONTROLLING INTERESTS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952163 - Statement - CONSOLIDATED STATEMENT OF EQUITY (DEFICIT) AND REDEEMABLE NONCONTROLLING INTERESTS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDSTATEMENTOFEQUITYDEFICITANDREDEEMABLENONCONTROLLINGINTERESTSParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENT OF EQUITY (DEFICIT) AND REDEEMABLE NONCONTROLLING INTERESTS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952164 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS_1</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - STOCK-BASED COMPENSATION PLANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/STOCKBASEDCOMPENSATIONPLANS</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - PROPERTY AND EQUIPMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROPERTYANDEQUIPMENT</Role>
      <ShortName>PROPERTY AND EQUIPMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETS</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - OTHER ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/OTHERASSETS</Role>
      <ShortName>OTHER ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCING</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASES</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - PROGRAM CONTRACTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROGRAMCONTRACTS</Role>
      <ShortName>PROGRAM CONTRACTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - COMMON STOCK</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/COMMONSTOCK</Role>
      <ShortName>COMMON STOCK</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9952175 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/COMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9952176 - Disclosure - VARIABLE INTEREST ENTITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/VARIABLEINTERESTENTITIES</Role>
      <ShortName>VARIABLE INTEREST ENTITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9952177 - Disclosure - RELATED PERSON TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONS</Role>
      <ShortName>RELATED PERSON TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9952178 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/EARNINGSPERSHARE</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9952179 - Disclosure - SEGMENT DATA</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/SEGMENTDATA</Role>
      <ShortName>SEGMENT DATA</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9952180 - Disclosure - FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/FAIRVALUEMEASUREMENTS</Role>
      <ShortName>FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9952181 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9952182 - Disclosure - EQUITY-BASED COMPENSATION PLANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/EQUITYBASEDCOMPENSATIONPLANS</Role>
      <ShortName>EQUITY-BASED COMPENSATION PLANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9952183 - Disclosure - PROPERTY AND EQUIPMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROPERTYANDEQUIPMENT_1</Role>
      <ShortName>PROPERTY AND EQUIPMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9952184 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETS_1</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9952185 - Disclosure - OTHER ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/OTHERASSETS_1</Role>
      <ShortName>OTHER ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9952186 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCING_1</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9952187 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASES_1</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9952188 - Disclosure - PROGRAM CONTRACTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROGRAMCONTRACTS_1</Role>
      <ShortName>PROGRAM CONTRACTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9952189 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXES_1</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9952190 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/COMMITMENTSANDCONTINGENCIES_1</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9952191 - Disclosure - VARIABLE INTEREST ENTITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/VARIABLEINTERESTENTITIES_1</Role>
      <ShortName>VARIABLE INTEREST ENTITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9952192 - Disclosure - RELATED PERSON TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONS_1</Role>
      <ShortName>RELATED PERSON TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9952193 - Disclosure - SEGMENT DATA</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/SEGMENTDATA_1</Role>
      <ShortName>SEGMENT DATA</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9952194 - Disclosure - FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/FAIRVALUEMEASUREMENTS_1</Role>
      <ShortName>FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - STOCK-BASED COMPENSATION PLANS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/STOCKBASEDCOMPENSATIONPLANSTables</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/STOCKBASEDCOMPENSATIONPLANS</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - PROPERTY AND EQUIPMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROPERTYANDEQUIPMENTTables</Role>
      <ShortName>PROPERTY AND EQUIPMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/PROPERTYANDEQUIPMENT</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSTables</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETS</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - OTHER ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/OTHERASSETSTables</Role>
      <ShortName>OTHER ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/OTHERASSETS</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCINGTables</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCING</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASESTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/LEASES</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - PROGRAM CONTRACTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROGRAMCONTRACTSTables</Role>
      <ShortName>PROGRAM CONTRACTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/PROGRAMCONTRACTS</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/INCOMETAXES</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - VARIABLE INTEREST ENTITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/VARIABLEINTERESTENTITIESTables</Role>
      <ShortName>VARIABLE INTEREST ENTITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/VARIABLEINTERESTENTITIES</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/EARNINGSPERSHARETables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/EARNINGSPERSHARE</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - SEGMENT DATA (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/SEGMENTDATATables</Role>
      <ShortName>SEGMENT DATA (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/SEGMENTDATA</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/FAIRVALUEMEASUREMENTSTables</Role>
      <ShortName>FAIR VALUE MEASUREMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/FAIRVALUEMEASUREMENTS</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - EQUITY-BASED COMPENSATION PLANS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/EQUITYBASEDCOMPENSATIONPLANSTables</Role>
      <ShortName>EQUITY-BASED COMPENSATION PLANS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/EQUITYBASEDCOMPENSATIONPLANS</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - PROPERTY AND EQUIPMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROPERTYANDEQUIPMENTTables_1</Role>
      <ShortName>PROPERTY AND EQUIPMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/PROPERTYANDEQUIPMENT</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSTables_1</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETS</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - OTHER ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/OTHERASSETSTables_1</Role>
      <ShortName>OTHER ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/OTHERASSETS</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCINGTables_1</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCING</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASESTables_1</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/LEASES</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - PROGRAM CONTRACTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROGRAMCONTRACTSTables_1</Role>
      <ShortName>PROGRAM CONTRACTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/PROGRAMCONTRACTS</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESTables_1</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/INCOMETAXES</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - VARIABLE INTEREST ENTITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/VARIABLEINTERESTENTITIESTables_1</Role>
      <ShortName>VARIABLE INTEREST ENTITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/VARIABLEINTERESTENTITIES</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - SEGMENT DATA (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/SEGMENTDATATables_1</Role>
      <ShortName>SEGMENT DATA (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/SEGMENTDATA</ParentRole>
      <Position>74</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/FAIRVALUEMEASUREMENTSTables_1</Role>
      <ShortName>FAIR VALUE MEASUREMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://sbgi.net/role/FAIRVALUEMEASUREMENTS</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Nature of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNatureofOperationsDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Nature of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Company Reorganization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESCompanyReorganizationDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Company Reorganization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAccountsReceivableDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Broadcast Television Programming (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESBroadcastTelevisionProgrammingDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Broadcast Television Programming (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Payable and Accrued Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAccountsPayableandAccruedLiabilitiesDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Payable and Accrued Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Hedge Accounting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESHedgeAccountingDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Hedge Accounting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Information - Statement of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESSupplementalInformationStatementofCashFlowsDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Information - Statement of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRevenueRecognitionDisaggregationofRevenueDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRevenueRecognitionNarrativeDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Acquisitions and Station Disposals (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAcquisitionsandStationDisposalsDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Acquisitions and Station Disposals (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advertising Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdvertisingExpenseDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advertising Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Post-retirement Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPostretirementBenefitsDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Post-retirement Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Redeemable Subsidiary Preferred Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRedeemableSubsidiaryPreferredEquityDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Redeemable Subsidiary Preferred Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - STOCK-BASED COMPENSATION PLANS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/STOCKBASEDCOMPENSATIONPLANSNarrativeDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - STOCK-BASED COMPENSATION PLANS - Schedule of Changes in Unvested Restricted Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/STOCKBASEDCOMPENSATIONPLANSScheduleofChangesinUnvestedRestrictedStockDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Schedule of Changes in Unvested Restricted Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - STOCK-BASED COMPENSATION PLANS - Schedule of SAR Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/STOCKBASEDCOMPENSATIONPLANSScheduleofSARActivityDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Schedule of SAR Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - STOCK-BASED COMPENSATION PLANS - Schedule of Assumptions Used to Estimate the Value of Stock Options Under ESPP (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/STOCKBASEDCOMPENSATIONPLANSScheduleofAssumptionsUsedtoEstimatetheValueofStockOptionsUnderESPPDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Schedule of Assumptions Used to Estimate the Value of Stock Options Under ESPP (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - STOCK-BASED COMPENSATION PLANS - Schedule of Summary of Changes in Outstanding Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/STOCKBASEDCOMPENSATIONPLANSScheduleofSummaryofChangesinOutstandingOptionsDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Schedule of Summary of Changes in Outstanding Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - PROPERTY AND EQUIPMENT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROPERTYANDEQUIPMENTDetails</Role>
      <ShortName>PROPERTY AND EQUIPMENT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://sbgi.net/role/PROPERTYANDEQUIPMENTTables</ParentRole>
      <Position>94</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Change in Carrying Amount of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSScheduleofChangeinCarryingAmountofGoodwillDetails</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Change in Carrying Amount of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSNarrativeDetails</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSTables</ParentRole>
      <Position>96</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Indefinite-Lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSScheduleofIndefiniteLivedIntangibleAssetsDetails</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Indefinite-Lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Definite Lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSScheduleofDefiniteLivedIntangibleAssetsDetails</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Definite Lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Estimated Amortization Expense of the Definite-lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSScheduleofEstimatedAmortizationExpenseoftheDefinitelivedIntangibleAssetsDetails</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Estimated Amortization Expense of the Definite-lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - OTHER ASSETS - Schedule of Other Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/OTHERASSETSScheduleofOtherAssetsDetails</Role>
      <ShortName>OTHER ASSETS - Schedule of Other Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - OTHER ASSETS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/OTHERASSETSNarrativeDetails</Role>
      <ShortName>OTHER ASSETS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Schedule of Notes Payable, Finance leases, and Commercial Bank Financing (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCINGScheduleofNotesPayableFinanceleasesandCommercialBankFinancingDetails</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Schedule of Notes Payable, Finance leases, and Commercial Bank Financing (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Schedule of Amended Credit Agreement, Notes Payable, and Finance Leases (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCINGScheduleofAmendedCreditAgreementNotesPayableandFinanceLeasesDetails</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Schedule of Amended Credit Agreement, Notes Payable, and Finance Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Additional Debt Narrative (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCINGAdditionalDebtNarrativeDetails</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Additional Debt Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>104</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Schedule of Stated and Weighted Average Effective Interest Rates (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCINGScheduleofStatedandWeightedAverageEffectiveInterestRatesDetails</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Schedule of Stated and Weighted Average Effective Interest Rates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - LEASES - Schedule of Lease Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASESScheduleofLeaseExpensesDetails</Role>
      <ShortName>LEASES - Schedule of Lease Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - LEASES - Schedule of Outstanding Operating and Finance Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASESScheduleofOutstandingOperatingandFinanceObligationsDetails</Role>
      <ShortName>LEASES - Schedule of Outstanding Operating and Finance Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>9955569 - Disclosure - LEASES - Schedule of Supplemental Balance Sheet Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASESScheduleofSupplementalBalanceSheetInformationDetails</Role>
      <ShortName>LEASES - Schedule of Supplemental Balance Sheet Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - LEASES - Schedule of Cash Flow Information Related to Lease (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASESScheduleofCashFlowInformationRelatedtoLeaseDetails</Role>
      <ShortName>LEASES - Schedule of Cash Flow Information Related to Lease (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - PROGRAM CONTRACTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROGRAMCONTRACTSDetails</Role>
      <ShortName>PROGRAM CONTRACTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://sbgi.net/role/PROGRAMCONTRACTSTables</ParentRole>
      <Position>110</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - COMMON STOCK (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/COMMONSTOCKDetails</Role>
      <ShortName>COMMON STOCK (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://sbgi.net/role/COMMONSTOCK</ParentRole>
      <Position>111</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>9955573 - Disclosure - INCOME TAXES - Schedule of Provision (Benefit) for Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESScheduleofProvisionBenefitforIncomeTaxesDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Provision (Benefit) for Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - INCOME TAXES - Schedule of Federal Tax Rate Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESScheduleofFederalTaxRateReconciliationDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Federal Tax Rate Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>113</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - INCOME TAXES - Schedule of Total Deferred Tax Assets And Deferred Tax Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESScheduleofTotalDeferredTaxAssetsAndDeferredTaxLiabilitiesDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Total Deferred Tax Assets And Deferred Tax Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - INCOME TAXES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESNarrativeDetails</Role>
      <ShortName>INCOME TAXES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - INCOME TAXES - Schedule of Activity Related To Accrued Unrecognized Tax Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESScheduleofActivityRelatedToAccruedUnrecognizedTaxBenefitsDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Activity Related To Accrued Unrecognized Tax Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - INCOME TAXES - Schedule of Net Cash Income Taxes Paid (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESScheduleofNetCashIncomeTaxesPaidDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Net Cash Income Taxes Paid (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>117</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>9955579 - Disclosure - COMMITMENTS AND CONTINGENCIES - Litigation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/COMMITMENTSANDCONTINGENCIESLitigationDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Litigation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>118</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>9955580 - Disclosure - COMMITMENTS AND CONTINGENCIES - Changes in the Rules on Television Ownership (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/COMMITMENTSANDCONTINGENCIESChangesintheRulesonTelevisionOwnershipDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Changes in the Rules on Television Ownership (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>119</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>9955581 - Disclosure - VARIABLE INTEREST ENTITIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/VARIABLEINTERESTENTITIESNarrativeDetails</Role>
      <ShortName>VARIABLE INTEREST ENTITIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>120</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R121.htm</HtmlFileName>
      <LongName>9955582 - Disclosure - VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/VARIABLEINTERESTENTITIESScheduleofVariableInterestEntitiesAssetsandLiabilitiesDetails</Role>
      <ShortName>VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>121</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R122.htm</HtmlFileName>
      <LongName>9955583 - Disclosure - RELATED PERSON TRANSACTIONS - Transactions With Our Controlling Shareholders (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSTransactionsWithOurControllingShareholdersDetails</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - Transactions With Our Controlling Shareholders (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>122</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R123.htm</HtmlFileName>
      <LongName>9955584 - Disclosure - RELATED PERSON TRANSACTIONS - Cunningham Broadcasting Corporation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSCunninghamBroadcastingCorporationDetails</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - Cunningham Broadcasting Corporation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>123</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R124.htm</HtmlFileName>
      <LongName>9955585 - Disclosure - RELATED PERSON TRANSACTIONS - Leased Property by Real Estate Ventures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSLeasedPropertybyRealEstateVenturesDetails</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - Leased Property by Real Estate Ventures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>124</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R125.htm</HtmlFileName>
      <LongName>9955586 - Disclosure - RELATED PERSON TRANSACTIONS - WG Communications Group (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSWGCommunicationsGroupDetails</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - WG Communications Group (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>125</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R126.htm</HtmlFileName>
      <LongName>9955587 - Disclosure - RELATED PERSON TRANSACTIONS - Diamond Sports Intermediate Holdings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSDiamondSportsIntermediateHoldingsDetails</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - Diamond Sports Intermediate Holdings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>126</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R127.htm</HtmlFileName>
      <LongName>9955588 - Disclosure - RELATED PERSON TRANSACTIONS - Employees (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSEmployeesDetails</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - Employees (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>127</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R128.htm</HtmlFileName>
      <LongName>9955589 - Disclosure - EARNINGS PER SHARE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/EARNINGSPERSHAREDetails</Role>
      <ShortName>EARNINGS PER SHARE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://sbgi.net/role/EARNINGSPERSHARETables</ParentRole>
      <Position>128</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R129.htm</HtmlFileName>
      <LongName>9955590 - Disclosure - SEGMENT DATA - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/SEGMENTDATANarrativeDetails</Role>
      <ShortName>SEGMENT DATA - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>129</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R130.htm</HtmlFileName>
      <LongName>9955591 - Disclosure - SEGMENT DATA - Segment Financial Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/SEGMENTDATASegmentFinancialInformationDetails</Role>
      <ShortName>SEGMENT DATA - Segment Financial Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>130</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R131.htm</HtmlFileName>
      <LongName>9955592 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Carrying Value and Fair Value of Notes and Debentures (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/FAIRVALUEMEASUREMENTSScheduleofCarryingValueandFairValueofNotesandDebenturesDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - Schedule of Carrying Value and Fair Value of Notes and Debentures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>131</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R132.htm</HtmlFileName>
      <LongName>9955593 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Level 3 Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/FAIRVALUEMEASUREMENTSScheduleofLevel3ActivityDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - Schedule of Level 3 Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>132</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R133.htm</HtmlFileName>
      <LongName>9955594 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Nature of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNatureofOperationsDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Nature of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>133</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R134.htm</HtmlFileName>
      <LongName>9955595 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Company Reorganization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESCompanyReorganizationDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Company Reorganization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>134</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R135.htm</HtmlFileName>
      <LongName>9955596 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAccountsReceivableDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>135</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R136.htm</HtmlFileName>
      <LongName>9955597 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Broadcast Television Programming (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESBroadcastTelevisionProgrammingDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Broadcast Television Programming (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>136</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R137.htm</HtmlFileName>
      <LongName>9955598 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Payable and Accrued Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAccountsPayableandAccruedLiabilitiesDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Payable and Accrued Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>137</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R138.htm</HtmlFileName>
      <LongName>9955599 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Hedge Accounting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESHedgeAccountingDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Hedge Accounting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>138</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R139.htm</HtmlFileName>
      <LongName>9955600 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Information - Statement of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESSupplementalInformationStatementofCashFlowsDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Information - Statement of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>139</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R140.htm</HtmlFileName>
      <LongName>9955601 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRevenueRecognitionDisaggregationofRevenueDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>140</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R141.htm</HtmlFileName>
      <LongName>9955602 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRevenueRecognitionNarrativeDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>141</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R142.htm</HtmlFileName>
      <LongName>9955603 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Acquisitions and Station Disposals (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAcquisitionsandStationDisposalsDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Acquisitions and Station Disposals (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>142</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R143.htm</HtmlFileName>
      <LongName>9955604 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advertising Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdvertisingExpenseDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advertising Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>143</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R144.htm</HtmlFileName>
      <LongName>9955605 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Post-retirement Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPostretirementBenefitsDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Post-retirement Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>144</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R145.htm</HtmlFileName>
      <LongName>9955606 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Redeemable Subsidiary Preferred Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRedeemableSubsidiaryPreferredEquityDetails_1</Role>
      <ShortName>NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Redeemable Subsidiary Preferred Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>145</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R146.htm</HtmlFileName>
      <LongName>9955607 - Disclosure - EQUITY-BASED COMPENSATION PLANS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/EQUITYBASEDCOMPENSATIONPLANSNarrativeDetails</Role>
      <ShortName>EQUITY-BASED COMPENSATION PLANS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>146</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R147.htm</HtmlFileName>
      <LongName>9955608 - Disclosure - EQUITY-BASED COMPENSATION PLANS -Schedule of Changes in Unvested Restricted Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/EQUITYBASEDCOMPENSATIONPLANSScheduleofChangesinUnvestedRestrictedStockDetails</Role>
      <ShortName>EQUITY-BASED COMPENSATION PLANS -Schedule of Changes in Unvested Restricted Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>147</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R148.htm</HtmlFileName>
      <LongName>9955609 - Disclosure - EQUITY-BASED COMPENSATION PLANS - Schedule of SARS Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/EQUITYBASEDCOMPENSATIONPLANSScheduleofSARSActivityDetails</Role>
      <ShortName>EQUITY-BASED COMPENSATION PLANS - Schedule of SARS Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>148</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R149.htm</HtmlFileName>
      <LongName>9955610 - Disclosure - EQUITY-BASED COMPENSATION PLANS - Schedule of Assumptions Used to Estimate the Value of Stock Options Under ESPP (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/EQUITYBASEDCOMPENSATIONPLANSScheduleofAssumptionsUsedtoEstimatetheValueofStockOptionsUnderESPPDetails</Role>
      <ShortName>EQUITY-BASED COMPENSATION PLANS - Schedule of Assumptions Used to Estimate the Value of Stock Options Under ESPP (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>149</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R150.htm</HtmlFileName>
      <LongName>9955611 - Disclosure - EQUITY-BASED COMPENSATION PLANS - Schedule of Changes in Outstanding Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/EQUITYBASEDCOMPENSATIONPLANSScheduleofChangesinOutstandingOptionsDetails</Role>
      <ShortName>EQUITY-BASED COMPENSATION PLANS - Schedule of Changes in Outstanding Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>150</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R151.htm</HtmlFileName>
      <LongName>9955612 - Disclosure - PROPERTY AND EQUIPMENT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROPERTYANDEQUIPMENTDetails_1</Role>
      <ShortName>PROPERTY AND EQUIPMENT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://sbgi.net/role/PROPERTYANDEQUIPMENTTables</ParentRole>
      <Position>151</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R152.htm</HtmlFileName>
      <LongName>9955613 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Change in Carrying Amount of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSScheduleofChangeinCarryingAmountofGoodwillDetails_1</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Change in Carrying Amount of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>152</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R153.htm</HtmlFileName>
      <LongName>9955614 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSNarrativeDetails_1</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSTables</ParentRole>
      <Position>153</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R154.htm</HtmlFileName>
      <LongName>9955615 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Indefinite-Lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSScheduleofIndefiniteLivedIntangibleAssetsDetails_1</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Indefinite-Lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>154</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R155.htm</HtmlFileName>
      <LongName>9955616 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Definite Lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSScheduleofDefiniteLivedIntangibleAssetsDetails_1</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Definite Lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>155</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R156.htm</HtmlFileName>
      <LongName>9955617 - Disclosure - GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Estimated Amortization Expense of the Definite-lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/GOODWILLINDEFINITELIVEDINTANGIBLEASSETSANDOTHERINTANGIBLEASSETSScheduleofEstimatedAmortizationExpenseoftheDefinitelivedIntangibleAssetsDetails_1</Role>
      <ShortName>GOODWILL,??INDEFINITE-LIVED INTANGIBLE ASSETS,??AND??OTHER??INTANGIBLE??ASSETS - Schedule of Estimated Amortization Expense of the Definite-lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>156</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R157.htm</HtmlFileName>
      <LongName>9955618 - Disclosure - OTHER ASSETS - Schedule of Other Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/OTHERASSETSScheduleofOtherAssetsDetails_1</Role>
      <ShortName>OTHER ASSETS - Schedule of Other Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>157</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R158.htm</HtmlFileName>
      <LongName>9955619 - Disclosure - OTHER ASSETS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/OTHERASSETSNarrativeDetails_1</Role>
      <ShortName>OTHER ASSETS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>158</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R159.htm</HtmlFileName>
      <LongName>9955620 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Schedule of Notes Payable, Capital Leases and Commercial Bank Financing (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCINGScheduleofNotesPayableCapitalLeasesandCommercialBankFinancingDetails</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Schedule of Notes Payable, Capital Leases and Commercial Bank Financing (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>159</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R160.htm</HtmlFileName>
      <LongName>9955621 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Schedule of Bank Credit Agreement, Notes Payable, and Finance Leases (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCINGScheduleofBankCreditAgreementNotesPayableandFinanceLeasesDetails</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Schedule of Bank Credit Agreement, Notes Payable, and Finance Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>160</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R161.htm</HtmlFileName>
      <LongName>9955622 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Additional Debt Narrative (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCINGAdditionalDebtNarrativeDetails_1</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Additional Debt Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>161</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R162.htm</HtmlFileName>
      <LongName>9955623 - Disclosure - NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Stated and Weighted Average Effective Interest Rates (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/NOTESPAYABLEANDCOMMERCIALBANKFINANCINGStatedandWeightedAverageEffectiveInterestRatesDetails</Role>
      <ShortName>NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Stated and Weighted Average Effective Interest Rates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>162</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R163.htm</HtmlFileName>
      <LongName>9955624 - Disclosure - LEASES - Schedule of Lease Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASESScheduleofLeaseExpensesDetails_1</Role>
      <ShortName>LEASES - Schedule of Lease Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>163</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R164.htm</HtmlFileName>
      <LongName>9955625 - Disclosure - LEASES - Schedule of Outstanding Operating and Finance Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASESScheduleofOutstandingOperatingandFinanceObligationsDetails_3</Role>
      <ShortName>LEASES - Schedule of Outstanding Operating and Finance Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>164</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R165.htm</HtmlFileName>
      <LongName>9955626 - Disclosure - LEASES - Schedule of Supplemental Balance Sheet Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASESScheduleofSupplementalBalanceSheetInformationDetails_1</Role>
      <ShortName>LEASES - Schedule of Supplemental Balance Sheet Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>165</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R166.htm</HtmlFileName>
      <LongName>9955627 - Disclosure - LEASES - Schedule of Cash Flow Information Related to Lease (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/LEASESScheduleofCashFlowInformationRelatedtoLeaseDetails_1</Role>
      <ShortName>LEASES - Schedule of Cash Flow Information Related to Lease (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>166</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R167.htm</HtmlFileName>
      <LongName>9955628 - Disclosure - PROGRAM CONTRACTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/PROGRAMCONTRACTSDetails_2</Role>
      <ShortName>PROGRAM CONTRACTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://sbgi.net/role/PROGRAMCONTRACTSTables</ParentRole>
      <Position>167</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R168.htm</HtmlFileName>
      <LongName>9955629 - Disclosure - INCOME TAXES - Schedule of Provision (Benefit) for Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESScheduleofProvisionBenefitforIncomeTaxesDetails_1</Role>
      <ShortName>INCOME TAXES - Schedule of Provision (Benefit) for Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>168</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R169.htm</HtmlFileName>
      <LongName>9955630 - Disclosure - INCOME TAXES - Schedule of Federal Tax Rate Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESScheduleofFederalTaxRateReconciliationDetails_1</Role>
      <ShortName>INCOME TAXES - Schedule of Federal Tax Rate Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>169</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R170.htm</HtmlFileName>
      <LongName>9955631 - Disclosure - INCOME TAXES - Schedule of Total Deferred Tax Assets And Deferred Tax Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESScheduleofTotalDeferredTaxAssetsAndDeferredTaxLiabilitiesDetails_1</Role>
      <ShortName>INCOME TAXES - Schedule of Total Deferred Tax Assets And Deferred Tax Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>170</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R171.htm</HtmlFileName>
      <LongName>9955632 - Disclosure - INCOME TAXES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESNarrativeDetails_1</Role>
      <ShortName>INCOME TAXES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>171</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R172.htm</HtmlFileName>
      <LongName>9955633 - Disclosure - INCOME TAXES - Schedule of Unrecognized Tax Benefit Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESScheduleofUnrecognizedTaxBenefitActivityDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Unrecognized Tax Benefit Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>172</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R173.htm</HtmlFileName>
      <LongName>9955634 - Disclosure - INCOME TAXES - Schedule of Net Cash Income Taxes Paid (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/INCOMETAXESScheduleofNetCashIncomeTaxesPaidDetails_1</Role>
      <ShortName>INCOME TAXES - Schedule of Net Cash Income Taxes Paid (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>173</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R174.htm</HtmlFileName>
      <LongName>9955635 - Disclosure - COMMITMENTS AND CONTINGENCIES - Litigation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/COMMITMENTSANDCONTINGENCIESLitigationDetails_1</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Litigation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>174</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R175.htm</HtmlFileName>
      <LongName>9955636 - Disclosure - COMMITMENTS AND CONTINGENCIES - Changes in the Rules on Television Ownership (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/COMMITMENTSANDCONTINGENCIESChangesintheRulesonTelevisionOwnershipDetails_1</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Changes in the Rules on Television Ownership (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>175</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R176.htm</HtmlFileName>
      <LongName>9955637 - Disclosure - VARIABLE INTEREST ENTITIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/VARIABLEINTERESTENTITIESNarrativeDetails_1</Role>
      <ShortName>VARIABLE INTEREST ENTITIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>176</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R177.htm</HtmlFileName>
      <LongName>9955638 - Disclosure - VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/VARIABLEINTERESTENTITIESScheduleofVariableInterestEntitiesAssetsandLiabilitiesDetails_1</Role>
      <ShortName>VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>177</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R178.htm</HtmlFileName>
      <LongName>9955639 - Disclosure - RELATED PERSON TRANSACTIONS - Transactions With SBG's Indirect Controlling Shareholders (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSTransactionsWithSBGsIndirectControllingShareholdersDetails</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - Transactions With SBG's Indirect Controlling Shareholders (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>178</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R179.htm</HtmlFileName>
      <LongName>9955640 - Disclosure - RELATED PERSON TRANSACTIONS - Cunningham Broadcasting Corporation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSCunninghamBroadcastingCorporationDetails_1</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - Cunningham Broadcasting Corporation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>179</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R180.htm</HtmlFileName>
      <LongName>9955641 - Disclosure - RELATED PERSON TRANSACTIONS - Leased Property by Real Estate Ventures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSLeasedPropertybyRealEstateVenturesDetails_1</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - Leased Property by Real Estate Ventures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>180</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R181.htm</HtmlFileName>
      <LongName>9955642 - Disclosure - RELATED PERSON TRANSACTIONS - WG Communications Group (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSWGCommunicationsGroupDetails_1</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - WG Communications Group (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>181</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R182.htm</HtmlFileName>
      <LongName>9955643 - Disclosure - RELATED PERSON TRANSACTIONS - Sinclair, Inc. (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSSinclairIncDetails</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - Sinclair, Inc. (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>182</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R183.htm</HtmlFileName>
      <LongName>9955644 - Disclosure - RELATED PERSON TRANSACTIONS - Diamond Sports Intermediate Holdings LLC (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSDiamondSportsIntermediateHoldingsLLCDetails</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - Diamond Sports Intermediate Holdings LLC (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>183</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R184.htm</HtmlFileName>
      <LongName>9955645 - Disclosure - RELATED PERSON TRANSACTIONS - Employees (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/RELATEDPERSONTRANSACTIONSEmployeesDetails_1</Role>
      <ShortName>RELATED PERSON TRANSACTIONS - Employees (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>184</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R185.htm</HtmlFileName>
      <LongName>9955646 - Disclosure - SEGMENT DATA - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/SEGMENTDATANarrativeDetails_1</Role>
      <ShortName>SEGMENT DATA - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>185</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R186.htm</HtmlFileName>
      <LongName>9955647 - Disclosure - SEGMENT DATA - Schedule of Segment Financial Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://sbgi.net/role/SEGMENTDATAScheduleofSegmentFinancialInformationDetails</Role>
      <ShortName>SEGMENT DATA - Schedule of Segment Financial Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>186</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R187.htm</HtmlFileName>
      <LongName>9955648 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Carrying Value and Fair Value of Notes and Debentures (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://sbgi.net/role/FAIRVALUEMEASUREMENTSScheduleofCarryingValueandFairValueofNotesandDebenturesDetails_1</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - Schedule of Carrying Value and Fair Value of Notes and Debentures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>187</Position>
    </Report>
    <Report instance="sbgi-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9999.htm</HtmlFileName>
      <LongName>Uncategorized Items - sbgi-20251231.htm</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/role/uncategorizedFacts</Role>
      <ShortName>Uncategorized Items - sbgi-20251231.htm</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>188</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="sbgi-20251231.htm">sbgi-20251231.htm</File>
    <File>sbgi-20251231.xsd</File>
    <File>sbgi-20251231_cal.xml</File>
    <File>sbgi-20251231_def.xml</File>
    <File>sbgi-20251231_lab.xml</File>
    <File>sbgi-20251231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>sbgi-20251231_g1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="2">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="3157">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="15">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="57">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
