<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>373</ContextCount>
  <ElementCount>507</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>124</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>995200090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>995200100 - Statement - CONSOLIDATED STATEMENTS OF INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/StatementConsolidatedStatementsOfIncome</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>995200200 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/StatementConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>995200300 - Statement - CONSOLIDATED STATEMENTS OF EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/StatementConsolidatedStatementsOfEquity</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>995200400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995200500 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/StatementConsolidatedBalanceSheets</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995210001 - Disclosure - NOTES TO CONSOLIDATED FINANCIAL STATEMENTS</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.videotron.com/role/DisclosureNotesToConsolidatedFinancialStatements</Role>
      <ShortName>NOTES TO CONSOLIDATED FINANCIAL STATEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995210101 - Disclosure - SUMMARY OF MATERIAL ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureSummaryOfMaterialAccountingPolicies</Role>
      <ShortName>SUMMARY OF MATERIAL ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995210201 - Disclosure - EMPLOYEE COSTS AND PURCHASE OF GOODS AND SERVICES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureEmployeeCostsAndPurchaseOfGoodsAndServices</Role>
      <ShortName>EMPLOYEE COSTS AND PURCHASE OF GOODS AND SERVICES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995210301 - Disclosure - FINANCIAL EXPENSES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialExpenses</Role>
      <ShortName>FINANCIAL EXPENSES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995210401 - Disclosure - RESTRUCTURING, IMPAIRMENT OF ASSETS AND OTHER</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRestructuringImpairmentOfAssetsAndOther</Role>
      <ShortName>RESTRUCTURING, IMPAIRMENT OF ASSETS AND OTHER</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995210501 - Disclosure - LOSS ON DEBT REFINANCING</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLossOnDebtRefinancing</Role>
      <ShortName>LOSS ON DEBT REFINANCING</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995210601 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureIncomeTaxes</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995210701 - Disclosure - BUSINESS ACQUISITIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureBusinessAcquisitions</Role>
      <ShortName>BUSINESS ACQUISITIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995210801 - Disclosure - ACCOUNTS RECEIVABLE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAccountsReceivable</Role>
      <ShortName>ACCOUNTS RECEIVABLE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995210901 - Disclosure - PROPERTY, PLANT AND EQUIPMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePropertyPlantAndEquipment</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995211001 - Disclosure - INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureIntangibleAssets</Role>
      <ShortName>INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995211101 - Disclosure - RIGHT-OF-USE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRightOfUseAssets</Role>
      <ShortName>RIGHT-OF-USE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995211201 - Disclosure - GOODWILL</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureGoodwill</Role>
      <ShortName>GOODWILL</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995211301 - Disclosure - OTHER ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureOtherAssets</Role>
      <ShortName>OTHER ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995211401 - Disclosure - ACCOUNTS PAYABLE, ACCRUED CHARGES AND PROVISIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAccountsPayableAccruedChargesAndProvisions</Role>
      <ShortName>ACCOUNTS PAYABLE, ACCRUED CHARGES AND PROVISIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995211501 - Disclosure - LONG-TERM DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLongTermDebt</Role>
      <ShortName>LONG-TERM DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995211601 - Disclosure - LEASE LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLeaseLiabilities</Role>
      <ShortName>LEASE LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995211701 - Disclosure - OTHER LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureOtherLiabilities</Role>
      <ShortName>OTHER LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995211801 - Disclosure - CAPITAL STOCK</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureCapitalStock</Role>
      <ShortName>CAPITAL STOCK</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995211901 - Disclosure - STOCK-BASED COMPENSATION PLANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureStockBasedCompensationPlans</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995212001 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO SHAREHOLDER</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAttributableToShareholder</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO SHAREHOLDER</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995212101 - Disclosure - COMMITMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureCommitments</Role>
      <ShortName>COMMITMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995212201 - Disclosure - GUARANTEES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureGuarantees</Role>
      <ShortName>GUARANTEES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995212301 - Disclosure - CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureContingencies</Role>
      <ShortName>CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995212401 - Disclosure - FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagement</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995212501 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRelatedPartyTransactions</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995212601 - Disclosure - PENSION PLANS AND POSTRETIREMENT BENEFITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePensionPlansAndPostretirementBenefits</Role>
      <ShortName>PENSION PLANS AND POSTRETIREMENT BENEFITS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995212701 - Disclosure - ADDITIONAL INFORMATION ON THE CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAdditionalInformationOnConsolidatedStatementsOfCashFlows</Role>
      <ShortName>ADDITIONAL INFORMATION ON THE CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.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>35</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.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>36</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>99920102 - Disclosure - SUMMARY OF MATERIAL ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureSummaryOfMaterialAccountingPoliciesPolicies</Role>
      <ShortName>SUMMARY OF MATERIAL ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>99930003 - Disclosure - NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.videotron.com/role/DisclosureNotesToConsolidatedFinancialStatementsTables</Role>
      <ShortName>NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureNotesToConsolidatedFinancialStatements</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>99930103 - Disclosure - SUMMARY OF MATERIAL ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureSummaryOfMaterialAccountingPoliciesTables</Role>
      <ShortName>SUMMARY OF MATERIAL ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureSummaryOfMaterialAccountingPolicies</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>99930203 - Disclosure - EMPLOYEE COSTS AND PURCHASE OF GOODS AND SERVICES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureEmployeeCostsAndPurchaseOfGoodsAndServicesTables</Role>
      <ShortName>EMPLOYEE COSTS AND PURCHASE OF GOODS AND SERVICES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureEmployeeCostsAndPurchaseOfGoodsAndServices</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>99930303 - Disclosure - FINANCIAL EXPENSES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialExpensesTables</Role>
      <ShortName>FINANCIAL EXPENSES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureFinancialExpenses</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>99930403 - Disclosure - RESTRUCTURING, IMPAIRMENT OF ASSETS AND OTHER (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRestructuringImpairmentOfAssetsAndOtherTables</Role>
      <ShortName>RESTRUCTURING, IMPAIRMENT OF ASSETS AND OTHER (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureRestructuringImpairmentOfAssetsAndOther</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>99930603 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureIncomeTaxesTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureIncomeTaxes</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>99930703 - Disclosure - BUSINESS ACQUISITIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureBusinessAcquisitionsTables</Role>
      <ShortName>BUSINESS ACQUISITIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureBusinessAcquisitions</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>99930803 - Disclosure - ACCOUNTS RECEIVABLE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAccountsReceivableTables</Role>
      <ShortName>ACCOUNTS RECEIVABLE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureAccountsReceivable</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>99930903 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePropertyPlantAndEquipmentTables</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosurePropertyPlantAndEquipment</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>99931003 - Disclosure - INTANGIBLE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureIntangibleAssetsTables</Role>
      <ShortName>INTANGIBLE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureIntangibleAssets</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>99931103 - Disclosure - RIGHT-OF-USE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRightOfUseAssetsTables</Role>
      <ShortName>RIGHT-OF-USE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureRightOfUseAssets</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>99931303 - Disclosure - OTHER ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureOtherAssetsTables</Role>
      <ShortName>OTHER ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureOtherAssets</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>99931403 - Disclosure - ACCOUNTS PAYABLE, ACCRUED CHARGES AND PROVISIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAccountsPayableAccruedChargesAndProvisionsTables</Role>
      <ShortName>ACCOUNTS PAYABLE, ACCRUED CHARGES AND PROVISIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureAccountsPayableAccruedChargesAndProvisions</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>99931503 - Disclosure - LONG-TERM DEBT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLongTermDebtTables</Role>
      <ShortName>LONG-TERM DEBT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureLongTermDebt</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>99931603 - Disclosure - LEASE LIABILITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLeaseLiabilitiesTables</Role>
      <ShortName>LEASE LIABILITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureLeaseLiabilities</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>99931703 - Disclosure - OTHER LIABILITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureOtherLiabilitiesTables</Role>
      <ShortName>OTHER LIABILITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureOtherLiabilities</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>99931803 - Disclosure - CAPITAL STOCK (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureCapitalStockTables</Role>
      <ShortName>CAPITAL STOCK (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureCapitalStock</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>99931903 - Disclosure - STOCK-BASED COMPENSATION PLANS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureStockBasedCompensationPlansTables</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureStockBasedCompensationPlans</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>99932003 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO SHAREHOLDER (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAttributableToShareholderTables</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO SHAREHOLDER (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAttributableToShareholder</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>99932103 - Disclosure - COMMITMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureCommitmentsTables</Role>
      <ShortName>COMMITMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureCommitments</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>99932403 - Disclosure - FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagementTables</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagement</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>99932503 - Disclosure - RELATED PARTY TRANSACTIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRelatedPartyTransactionsTables</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureRelatedPartyTransactions</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>99932603 - Disclosure - PENSION PLANS AND POSTRETIREMENT BENEFITS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePensionPlansAndPostretirementBenefitsTables</Role>
      <ShortName>PENSION PLANS AND POSTRETIREMENT BENEFITS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosurePensionPlansAndPostretirementBenefits</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>99932703 - Disclosure - ADDITIONAL INFORMATION ON THE CONSOLIDATED STATEMENTS OF CASH FLOWS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAdditionalInformationOnConsolidatedStatementsOfCashFlowsTables</Role>
      <ShortName>ADDITIONAL INFORMATION ON THE CONSOLIDATED STATEMENTS OF CASH FLOWS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureAdditionalInformationOnConsolidatedStatementsOfCashFlows</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>99940001 - Disclosure - NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.videotron.com/role/DisclosureNotesToConsolidatedFinancialStatementsDetails</Role>
      <ShortName>NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureNotesToConsolidatedFinancialStatementsTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>99940101 - Disclosure - SUMMARY OF MATERIAL ACCOUNTING POLICIES - Tax credits, government assistance and deferred subsidies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureSummaryOfMaterialAccountingPoliciesTaxCreditsGovernmentAssistanceAndDeferredSubsidiesDetails</Role>
      <ShortName>SUMMARY OF MATERIAL ACCOUNTING POLICIES - Tax credits, government assistance and deferred subsidies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>99940102 - Disclosure - SUMMARY OF MATERIAL ACCOUNTING POLICIES - Property, plant and equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureSummaryOfMaterialAccountingPoliciesPropertyPlantAndEquipmentDetails</Role>
      <ShortName>SUMMARY OF MATERIAL ACCOUNTING POLICIES - Property, plant and equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>99940103 - Disclosure - SUMMARY OF MATERIAL ACCOUNTING POLICIES - Goodwill and intangible assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureSummaryOfMaterialAccountingPoliciesGoodwillAndIntangibleAssetsDetails</Role>
      <ShortName>SUMMARY OF MATERIAL ACCOUNTING POLICIES - Goodwill and intangible assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>99940201 - Disclosure - EMPLOYEE COSTS AND PURCHASE OF GOODS AND SERVICES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureEmployeeCostsAndPurchaseOfGoodsAndServicesDetails</Role>
      <ShortName>EMPLOYEE COSTS AND PURCHASE OF GOODS AND SERVICES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureEmployeeCostsAndPurchaseOfGoodsAndServicesTables</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>99940301 - Disclosure - FINANCIAL EXPENSES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialExpensesDetails</Role>
      <ShortName>FINANCIAL EXPENSES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureFinancialExpensesTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>99940401 - Disclosure - RESTRUCTURING, IMPAIRMENT OF ASSETS AND OTHER (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRestructuringImpairmentOfAssetsAndOtherDetails</Role>
      <ShortName>RESTRUCTURING, IMPAIRMENT OF ASSETS AND OTHER (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureRestructuringImpairmentOfAssetsAndOtherTables</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>99940501 - Disclosure - LOSS ON DEBT REFINANCING (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLossOnDebtRefinancingDetails</Role>
      <ShortName>LOSS ON DEBT REFINANCING (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureLossOnDebtRefinancing</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>99940601 - Disclosure - INCOME TAXES - Reconciliation of income tax expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureIncomeTaxesReconciliationOfIncomeTaxExpenseDetails</Role>
      <ShortName>INCOME TAXES - Reconciliation of income tax expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>99940602 - Disclosure - INCOME TAXES - Components of deferred income tax (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureIncomeTaxesComponentsOfDeferredIncomeTaxDetails</Role>
      <ShortName>INCOME TAXES - Components of deferred income tax (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>99940603 - Disclosure - INCOME TAXES - Changes in deferred income tax liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureIncomeTaxesChangesInDeferredIncomeTaxLiabilityDetails</Role>
      <ShortName>INCOME TAXES - Changes in deferred income tax liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>99940701 - Disclosure - BUSINESS ACQUISITIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureBusinessAcquisitionsDetails</Role>
      <ShortName>BUSINESS ACQUISITIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureBusinessAcquisitionsTables</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>99940702 - Disclosure - BUSINESS ACQUISITIONS - Schedule of fair value of net assets acquired (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureBusinessAcquisitionsScheduleOfFairValueOfNetAssetsAcquiredDetails</Role>
      <ShortName>BUSINESS ACQUISITIONS - Schedule of fair value of net assets acquired (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>99940801 - Disclosure - ACCOUNTS RECEIVABLE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAccountsReceivableDetails</Role>
      <ShortName>ACCOUNTS RECEIVABLE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureAccountsReceivableTables</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>99940901 - Disclosure - PROPERTY, PLANT AND EQUIPMENT - Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePropertyPlantAndEquipmentCostDetails</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT - Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosurePropertyPlantAndEquipmentTables</ParentRole>
      <Position>76</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>99940902 - Disclosure - PROPERTY, PLANT AND EQUIPMENT - Accumulated depreciation and impairment loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationAndImpairmentLossDetails</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT - Accumulated depreciation and impairment loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>99941001 - Disclosure - INTANGIBLE ASSETS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureIntangibleAssetsDetails</Role>
      <ShortName>INTANGIBLE ASSETS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureIntangibleAssetsTables</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>99941101 - Disclosure - RIGHT-OF-USE ASSETS - Changes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRightOfUseAssetsChangesDetails</Role>
      <ShortName>RIGHT-OF-USE ASSETS - Changes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>99941102 - Disclosure - RIGHT-OF-USE ASSETS - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRightOfUseAssetsAdditionalInformationDetails</Role>
      <ShortName>RIGHT-OF-USE ASSETS - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>99941201 - Disclosure - GOODWILL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureGoodwillDetails</Role>
      <ShortName>GOODWILL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureGoodwill</ParentRole>
      <Position>81</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>99941202 - Disclosure - GOODWILL - Recoverable amount (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureGoodwillRecoverableAmountDetails</Role>
      <ShortName>GOODWILL - Recoverable amount (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>99941301 - Disclosure - OTHER ASSETS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureOtherAssetsDetails</Role>
      <ShortName>OTHER ASSETS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureOtherAssetsTables</ParentRole>
      <Position>83</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>99941401 - Disclosure - ACCOUNTS PAYABLE, ACCRUED CHARGES AND PROVISIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAccountsPayableAccruedChargesAndProvisionsDetails</Role>
      <ShortName>ACCOUNTS PAYABLE, ACCRUED CHARGES AND PROVISIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureAccountsPayableAccruedChargesAndProvisionsTables</ParentRole>
      <Position>84</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>99941501 - Disclosure - LONG-TERM DEBT - Summary of long-term debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLongTermDebtSummaryOfLongTermDebtDetails</Role>
      <ShortName>LONG-TERM DEBT - Summary of long-term debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>99941502 - Disclosure - LONG-TERM DEBT - Senior notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLongTermDebtSeniorNotesDetails</Role>
      <ShortName>LONG-TERM DEBT - Senior notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>99941503 - Disclosure - LONG-TERM DEBT - Principal repayments of long-term debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLongTermDebtPrincipalRepaymentsOfLongTermDebtDetails</Role>
      <ShortName>LONG-TERM DEBT - Principal repayments of long-term debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>99941504 - Disclosure - LONG-TERM DEBT - Changes in long-term debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLongTermDebtChangesInLongTermDebtDetails</Role>
      <ShortName>LONG-TERM DEBT - Changes in long-term debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>99941601 - Disclosure - LEASE LIABILITIES - Changes in lease liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLeaseLiabilitiesChangesInLeaseLiabilitiesDetails</Role>
      <ShortName>LEASE LIABILITIES - Changes in lease liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>99941602 - Disclosure - LEASE LIABILITIES - Repayments of lease liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureLeaseLiabilitiesRepaymentsOfLeaseLiabilitiesDetails</Role>
      <ShortName>LEASE LIABILITIES - Repayments of lease liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>99941701 - Disclosure - OTHER LIABILITIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureOtherLiabilitiesDetails</Role>
      <ShortName>OTHER LIABILITIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureOtherLiabilitiesTables</ParentRole>
      <Position>91</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>99941801 - Disclosure - CAPITAL STOCK - Authorized capital stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureCapitalStockAuthorizedCapitalStockDetails</Role>
      <ShortName>CAPITAL STOCK - Authorized capital stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>99941802 - Disclosure - CAPITAL STOCK - Issued and outstanding capital stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureCapitalStockIssuedAndOutstandingCapitalStockDetails</Role>
      <ShortName>CAPITAL STOCK - Issued and outstanding capital stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>99941901 - Disclosure - STOCK-BASED COMPENSATION PLANS - Ultimate parent corporation stock option plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureStockBasedCompensationPlansUltimateParentCorporationStockOptionPlanDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Ultimate parent corporation stock option plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>99941902 - Disclosure - STOCK-BASED COMPENSATION PLANS - Ultimate parent corporation outstanding options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureStockBasedCompensationPlansUltimateParentCorporationOutstandingOptionsDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Ultimate parent corporation outstanding options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>99941903 - Disclosure - STOCK-BASED COMPENSATION PLANS - Assumptions in estimating the fair value of awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureStockBasedCompensationPlansAssumptionsInEstimatingFairValueOfAwardsDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Assumptions in estimating the fair value of awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>99941904 - Disclosure - STOCK-BASED COMPENSATION PLANS - Liability and expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureStockBasedCompensationPlansLiabilityAndExpenseDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION PLANS - Liability and expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>99942001 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO SHAREHOLDER (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAttributableToShareholderDetails</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO SHAREHOLDER (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAttributableToShareholderTables</ParentRole>
      <Position>98</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>99942101 - Disclosure - COMMITMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureCommitmentsDetails</Role>
      <ShortName>COMMITMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureCommitmentsTables</ParentRole>
      <Position>99</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>99942401 - Disclosure - FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Foreign exchange forward contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagementForeignExchangeForwardContractsDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Foreign exchange forward contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>99942402 - Disclosure - FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Interest rate swaps (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagementInterestRateSwapsDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Interest rate swaps (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>99942403 - Disclosure - FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Cross-currency swaps (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagementCrossCurrencySwapsDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Cross-currency swaps (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>99942404 - Disclosure - FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Carrying value and fair value of long-term debt and derivative financial instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagementCarryingValueAndFairValueOfLongTermDebtAndDerivativeFinancialInstrumentsDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Carrying value and fair value of long-term debt and derivative financial instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>99942405 - Disclosure - FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Credit risk management (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagementCreditRiskManagementDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Credit risk management (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>104</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>99942406 - Disclosure - FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Changes to the provision for expected credit losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagementChangesToProvisionForExpectedCreditLossesDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Changes to the provision for expected credit losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>99942407 - Disclosure - FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Liquidity risk management (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagementLiquidityRiskManagementDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Liquidity risk management (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>99942408 - Disclosure - FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Market risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagementMarketRiskDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Market risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>99942409 - Disclosure - FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Capital management (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureFinancialInstrumentsAndFinancialRiskManagementCapitalManagementDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Capital management (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>99942501 - Disclosure - RELATED PARTY TRANSACTIONS - Compensation of key management personnel (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRelatedPartyTransactionsCompensationOfKeyManagementPersonnelDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Compensation of key management personnel (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>99942502 - Disclosure - RELATED PARTY TRANSACTIONS - Operating transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRelatedPartyTransactionsOperatingTransactionsDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Operating transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>99942503 - Disclosure - RELATED PARTY TRANSACTIONS - Management arrangements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRelatedPartyTransactionsManagementArrangementsDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Management arrangements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>111</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>99942504 - Disclosure - RELATED PARTY TRANSACTIONS - Accounts receivable from affiliated corporations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRelatedPartyTransactionsAccountsReceivableFromAffiliatedCorporationsDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Accounts receivable from affiliated corporations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>99942505 - Disclosure - RELATED PARTY TRANSACTIONS - Accounts payable to affiliated corporations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRelatedPartyTransactionsAccountsPayableToAffiliatedCorporationsDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Accounts payable to affiliated corporations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>113</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>99942506 - Disclosure - RELATED PARTY TRANSACTIONS - Promissory note receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRelatedPartyTransactionsPromissoryNoteReceivableDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Promissory note receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>99942507 - Disclosure - RELATED PARTY TRANSACTIONS - Tax consolidation transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureRelatedPartyTransactionsTaxConsolidationTransactionsDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Tax consolidation transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>99942601 - Disclosure - PENSION PLANS AND POSTRETIREMENT BENEFITS - Changes in the plans benefit obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePensionPlansAndPostretirementBenefitsChangesInPlansBenefitObligationsDetails</Role>
      <ShortName>PENSION PLANS AND POSTRETIREMENT BENEFITS - Changes in the plans benefit obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>99942602 - Disclosure - PENSION PLANS AND POSTRETIREMENT BENEFITS - Changes in the fair value of plan assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePensionPlansAndPostretirementBenefitsChangesInFairValueOfPlanAssetsDetails</Role>
      <ShortName>PENSION PLANS AND POSTRETIREMENT BENEFITS - Changes in the fair value of plan assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>117</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>99942603 - Disclosure - PENSION PLANS AND POSTRETIREMENT BENEFITS - Components of plan assets and reconciliation of funded status (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePensionPlansAndPostretirementBenefitsComponentsOfPlanAssetsAndReconciliationOfFundedStatusDetails</Role>
      <ShortName>PENSION PLANS AND POSTRETIREMENT BENEFITS - Components of plan assets and reconciliation of funded status (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>118</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>99942604 - Disclosure - PENSION PLANS AND POSTRETIREMENT BENEFITS - Components of re-measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePensionPlansAndPostretirementBenefitsComponentsOfReMeasurementsDetails</Role>
      <ShortName>PENSION PLANS AND POSTRETIREMENT BENEFITS - Components of re-measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>119</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>99942605 - Disclosure - PENSION PLANS AND POSTRETIREMENT BENEFITS - Components of the net benefit costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePensionPlansAndPostretirementBenefitsComponentsOfNetBenefitCostsDetails</Role>
      <ShortName>PENSION PLANS AND POSTRETIREMENT BENEFITS - Components of the net benefit costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>120</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R121.htm</HtmlFileName>
      <LongName>99942606 - Disclosure - PENSION PLANS AND POSTRETIREMENT BENEFITS - Assumptions and sensitivity analysis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosurePensionPlansAndPostretirementBenefitsAssumptionsAndSensitivityAnalysisDetails</Role>
      <ShortName>PENSION PLANS AND POSTRETIREMENT BENEFITS - Assumptions and sensitivity analysis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>121</Position>
    </Report>
    <Report instance="vi-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R122.htm</HtmlFileName>
      <LongName>99942701 - Disclosure - ADDITIONAL INFORMATION ON THE CONSOLIDATED STATEMENTS OF CASH FLOWS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.videotron.com/role/DisclosureAdditionalInformationOnConsolidatedStatementsOfCashFlowsDetails</Role>
      <ShortName>ADDITIONAL INFORMATION ON THE CONSOLIDATED STATEMENTS OF CASH FLOWS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.videotron.com/role/DisclosureAdditionalInformationOnConsolidatedStatementsOfCashFlowsTables</ParentRole>
      <Position>122</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>vi-20251231.xsd</File>
    <File>vi-20251231_cal.xml</File>
    <File>vi-20251231_def.xml</File>
    <File>vi-20251231_lab.xml</File>
    <File>vi-20251231_pre.xml</File>
    <File doctype="20-F" isDefinitelyFs="true" isIfrs="true" isUsgaap="true" original="vi-20251231x20f.htm">vi-20251231x20f.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>vi-20251231x20f003.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="15">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="33">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="1">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
    <BaseTaxonomy items="914">https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
