<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>489</ContextCount>
  <ElementCount>402</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>136</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>12</UnitCount>
  <MyReports>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952151 - Statement - Consolidated Statements of Financial Position</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/ConsolidatedStatementsofFinancialPosition</Role>
      <ShortName>Consolidated Statements of Financial Position</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952152 - Statement - Consolidated Statements of Loss and Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/ConsolidatedStatementsofLossandComprehensiveIncomeLoss</Role>
      <ShortName>Consolidated Statements of Loss and Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952153 - Statement - Consolidated Statements of Changes in Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/ConsolidatedStatementsofChangesinEquity</Role>
      <ShortName>Consolidated Statements of Changes in Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952154 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/ConsolidatedStatementsofCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952155 - Disclosure - Reporting entity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Reportingentity</Role>
      <ShortName>Reporting entity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952156 - Disclosure - Basis of preparation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Basisofpreparation</Role>
      <ShortName>Basis of preparation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952157 - Disclosure - Changes in accounting policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Changesinaccountingpolicies</Role>
      <ShortName>Changes in accounting policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - Material accounting policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Materialaccountingpolicies</Role>
      <ShortName>Material accounting policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - Critical judgments in applying accounting policies and key sources of estimation uncertainty</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Criticaljudgmentsinapplyingaccountingpoliciesandkeysourcesofestimationuncertainty</Role>
      <ShortName>Critical judgments in applying accounting policies and key sources of estimation uncertainty</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - Recent accounting pronouncements and future accounting policy changes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Recentaccountingpronouncementsandfutureaccountingpolicychanges</Role>
      <ShortName>Recent accounting pronouncements and future accounting policy changes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - Trade and other receivables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Tradeandotherreceivables</Role>
      <ShortName>Trade and other receivables</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Inventories</Role>
      <ShortName>Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - Property, plant and equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Propertyplantandequipment</Role>
      <ShortName>Property, plant and equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Intangible assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Intangibleassets</Role>
      <ShortName>Intangible assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - Equity-accounted Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityaccountedInvestments</Role>
      <ShortName>Equity-accounted Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - Long-term financial investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Longtermfinancialinvestments</Role>
      <ShortName>Long-term financial investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - Bank facilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Bankfacilities</Role>
      <ShortName>Bank facilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - Trade and other payables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Tradeandotherpayables</Role>
      <ShortName>Trade and other payables</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - Deferred revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Deferredrevenue</Role>
      <ShortName>Deferred revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - Provisions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Provisions</Role>
      <ShortName>Provisions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - Lease liability</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Leaseliability</Role>
      <ShortName>Lease liability</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - Other non-current liabilities and employee future benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Othernoncurrentliabilitiesandemployeefuturebenefits</Role>
      <ShortName>Other non-current liabilities and employee future benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Equity</Role>
      <ShortName>Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - Commitments and contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Commitmentsandcontingencies</Role>
      <ShortName>Commitments and contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9952175 - Disclosure - Disaggregation of revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Disaggregationofrevenue</Role>
      <ShortName>Disaggregation of revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9952176 - Disclosure - Personnel expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Personnelexpenses</Role>
      <ShortName>Personnel expenses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9952177 - Disclosure - Other operating expense</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Otheroperatingexpense</Role>
      <ShortName>Other operating expense</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9952178 - Disclosure - Finance income and expense</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Financeincomeandexpense</Role>
      <ShortName>Finance income and expense</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9952179 - Disclosure - Related party transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Relatedpartytransactions</Role>
      <ShortName>Related party transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9952180 - Disclosure - Impairment charges on goodwill</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Impairmentchargesongoodwill</Role>
      <ShortName>Impairment charges on goodwill</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9952181 - Disclosure - Discontinued operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Discontinuedoperations</Role>
      <ShortName>Discontinued operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9952182 - Disclosure - Income taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Incometaxes</Role>
      <ShortName>Income taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9952183 - Disclosure - Supplemental disclosure of cash flow information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Supplementaldisclosureofcashflowinformation</Role>
      <ShortName>Supplemental disclosure of cash flow information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9952184 - Disclosure - Operating segments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Operatingsegments</Role>
      <ShortName>Operating segments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9952185 - Disclosure - Financial instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/Financialinstruments</Role>
      <ShortName>Financial instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - Material accounting policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/MaterialaccountingpoliciesPolicies</Role>
      <ShortName>Material accounting policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - Material accounting policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/MaterialaccountingpoliciesTables</Role>
      <ShortName>Material accounting policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Materialaccountingpolicies</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - Trade and other receivables (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/TradeandotherreceivablesTables</Role>
      <ShortName>Trade and other receivables (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Tradeandotherreceivables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/InventoriesTables</Role>
      <ShortName>Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Inventories</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - Property, plant and equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/PropertyplantandequipmentTables</Role>
      <ShortName>Property, plant and equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Propertyplantandequipment</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - Intangible assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/IntangibleassetsTables</Role>
      <ShortName>Intangible assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Intangibleassets</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - Equity-accounted Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityaccountedInvestmentsTables</Role>
      <ShortName>Equity-accounted Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/EquityaccountedInvestments</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - Long-term financial investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/LongtermfinancialinvestmentsTables</Role>
      <ShortName>Long-term financial investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Longtermfinancialinvestments</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - Trade and other payables (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/TradeandotherpayablesTables</Role>
      <ShortName>Trade and other payables (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Tradeandotherpayables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - Deferred revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/DeferredrevenueTables</Role>
      <ShortName>Deferred revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Deferredrevenue</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - Provisions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/ProvisionsTables</Role>
      <ShortName>Provisions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Provisions</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - Lease liability (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/LeaseliabilityTables</Role>
      <ShortName>Lease liability (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Leaseliability</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - Other non-current liabilities and employee future benefits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/OthernoncurrentliabilitiesandemployeefuturebenefitsTables</Role>
      <ShortName>Other non-current liabilities and employee future benefits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Othernoncurrentliabilitiesandemployeefuturebenefits</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityTables</Role>
      <ShortName>Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/EquityaccountedInvestments</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - Disaggregation of revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/DisaggregationofrevenueTables</Role>
      <ShortName>Disaggregation of revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Disaggregationofrevenue</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - Personnel expenses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/PersonnelexpensesTables</Role>
      <ShortName>Personnel expenses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Personnelexpenses</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - Other operating expense (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/OtheroperatingexpenseTables</Role>
      <ShortName>Other operating expense (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Otheroperatingexpense</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - Finance income and expense (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/FinanceincomeandexpenseTables</Role>
      <ShortName>Finance income and expense (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Financeincomeandexpense</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - Related party transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/RelatedpartytransactionsTables</Role>
      <ShortName>Related party transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Relatedpartytransactions</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - Discontinued operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/DiscontinuedoperationsTables</Role>
      <ShortName>Discontinued operations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Discontinuedoperations</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - Income taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/IncometaxesTables</Role>
      <ShortName>Income taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Incometaxes</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - Supplemental disclosure of cash flow information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/SupplementaldisclosureofcashflowinformationTables</Role>
      <ShortName>Supplemental disclosure of cash flow information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Supplementaldisclosureofcashflowinformation</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - Operating segments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/OperatingsegmentsTables</Role>
      <ShortName>Operating segments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Operatingsegments</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - Financial instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/FinancialinstrumentsTables</Role>
      <ShortName>Financial instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Financialinstruments</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - Material accounting policies - Schedule of Subsidiaries (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/MaterialaccountingpoliciesScheduleofSubsidiariesDetails</Role>
      <ShortName>Material accounting policies - Schedule of Subsidiaries (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - Material accounting policies - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/MaterialaccountingpoliciesNarrativeDetails</Role>
      <ShortName>Material accounting policies - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - Material accounting policies - Schedule of Estimated Useful Lives of Property, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/MaterialaccountingpoliciesScheduleofEstimatedUsefulLivesofPropertyPlantandEquipmentDetails</Role>
      <ShortName>Material accounting policies - Schedule of Estimated Useful Lives of Property, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - Material accounting policies - Schedule of Leased Assets Depreciated Over the Lease Term or Their Useful Lives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/MaterialaccountingpoliciesScheduleofLeasedAssetsDepreciatedOvertheLeaseTermorTheirUsefulLivesDetails</Role>
      <ShortName>Material accounting policies - Schedule of Leased Assets Depreciated Over the Lease Term or Their Useful Lives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - Material accounting policies - Schedule of Estimated Useful Lives of Goodwill and Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/MaterialaccountingpoliciesScheduleofEstimatedUsefulLivesofGoodwillandIntangibleAssetsDetails</Role>
      <ShortName>Material accounting policies - Schedule of Estimated Useful Lives of Goodwill and Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - Trade and other receivables - Schedule of Trade and Other Receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/TradeandotherreceivablesScheduleofTradeandOtherReceivablesDetails</Role>
      <ShortName>Trade and other receivables - Schedule of Trade and Other Receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - Trade and other receivables - Schedule of Contract Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/TradeandotherreceivablesScheduleofContractAssetsDetails</Role>
      <ShortName>Trade and other receivables - Schedule of Contract Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - Inventories - Schedule of Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/InventoriesScheduleofInventoriesDetails</Role>
      <ShortName>Inventories - Schedule of Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - Inventories - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/InventoriesNarrativeDetails</Role>
      <ShortName>Inventories - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - Property, plant and equipment - Schedule of Property, Plant and Equipment Including Right-of-Use Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/PropertyplantandequipmentScheduleofPropertyPlantandEquipmentIncludingRightofUseAssetsDetails</Role>
      <ShortName>Property, plant and equipment - Schedule of Property, Plant and Equipment Including Right-of-Use Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - Property, plant and equipment - Schedule of Net Carrying Amounts of Property, Plant and Equipment Owned (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/PropertyplantandequipmentScheduleofNetCarryingAmountsofPropertyPlantandEquipmentOwnedDetails</Role>
      <ShortName>Property, plant and equipment - Schedule of Net Carrying Amounts of Property, Plant and Equipment Owned (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - Property, plant and equipment - Schedule of Roll Forward of Property, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/PropertyplantandequipmentScheduleofRollForwardofPropertyPlantandEquipmentDetails</Role>
      <ShortName>Property, plant and equipment - Schedule of Roll Forward of Property, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - Property, plant and equipment - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/PropertyplantandequipmentNarrativeDetails</Role>
      <ShortName>Property, plant and equipment - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - Property, plant and equipment - Schedule of Net Carrying Amounts Included in Property, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/PropertyplantandequipmentScheduleofNetCarryingAmountsIncludedinPropertyPlantandEquipmentDetails</Role>
      <ShortName>Property, plant and equipment - Schedule of Net Carrying Amounts Included in Property, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - Property, plant and equipment - Schedule of Roll Forward of Right-of-Use Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/PropertyplantandequipmentScheduleofRollForwardofRightofUseAssetsDetails</Role>
      <ShortName>Property, plant and equipment - Schedule of Roll Forward of Right-of-Use Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - Intangible assets - Schedule of Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/IntangibleassetsScheduleofIntangibleAssetsDetails</Role>
      <ShortName>Intangible assets - Schedule of Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - Intangible assets - Schedule of Reconciliation of Changes in Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/IntangibleassetsScheduleofReconciliationofChangesinIntangibleAssetsDetails</Role>
      <ShortName>Intangible assets - Schedule of Reconciliation of Changes in Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - Intangible assets - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/IntangibleassetsNarrativeDetails</Role>
      <ShortName>Intangible assets - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - Equity-accounted Investments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityaccountedInvestmentsNarrativeDetails</Role>
      <ShortName>Equity-accounted Investments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - Equity-accounted Investments - Schedule of Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityaccountedInvestmentsScheduleofInvestmentsDetails</Role>
      <ShortName>Equity-accounted Investments - Schedule of Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - Equity-accounted Investments - Financial Information of Weichai Ballard (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityaccountedInvestmentsFinancialInformationofWeichaiBallardDetails</Role>
      <ShortName>Equity-accounted Investments - Financial Information of Weichai Ballard (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - Long-term financial investments - Schedule of Equity- Accounted Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/LongtermfinancialinvestmentsScheduleofEquityAccountedInvestmentsDetails</Role>
      <ShortName>Long-term financial investments - Schedule of Equity- Accounted Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - Long-term financial investments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/LongtermfinancialinvestmentsNarrativeDetails</Role>
      <ShortName>Long-term financial investments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - Bank facilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/BankfacilitiesDetails</Role>
      <ShortName>Bank facilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Bankfacilities</ParentRole>
      <Position>85</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - Trade and other payables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/TradeandotherpayablesDetails</Role>
      <ShortName>Trade and other payables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ballard.com/role/TradeandotherpayablesTables</ParentRole>
      <Position>86</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - Deferred revenue - Schedule of Deferred Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/DeferredrevenueScheduleofDeferredRevenueDetails</Role>
      <ShortName>Deferred revenue - Schedule of Deferred Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - Deferred revenue - Schedule of Contract Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/DeferredrevenueScheduleofContractLiabilitiesDetails</Role>
      <ShortName>Deferred revenue - Schedule of Contract Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - Provisions - Schedule of Provisions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/ProvisionsScheduleofProvisionsDetails</Role>
      <ShortName>Provisions - Schedule of Provisions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - Provisions - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/ProvisionsNarrativeDetails</Role>
      <ShortName>Provisions - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - Lease liability - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/LeaseliabilityNarrativeDetails</Role>
      <ShortName>Lease liability - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - Lease liability - Schedule of Lease Liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/LeaseliabilityScheduleofLeaseLiabilityDetails</Role>
      <ShortName>Lease liability - Schedule of Lease Liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - Lease liability - Schedule of Future Minimum Lease Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/LeaseliabilityScheduleofFutureMinimumLeasePaymentsDetails</Role>
      <ShortName>Lease liability - Schedule of Future Minimum Lease Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - Other non-current liabilities and employee future benefits - Schedule of Other Non-Current Liabilities and Employee Future Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/OthernoncurrentliabilitiesandemployeefuturebenefitsScheduleofOtherNonCurrentLiabilitiesandEmployeeFutureBenefitsDetails</Role>
      <ShortName>Other non-current liabilities and employee future benefits - Schedule of Other Non-Current Liabilities and Employee Future Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - Other non-current liabilities and employee future benefits - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/OthernoncurrentliabilitiesandemployeefuturebenefitsNarrativeDetails</Role>
      <ShortName>Other non-current liabilities and employee future benefits - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ballard.com/role/OthernoncurrentliabilitiesandemployeefuturebenefitsTables</ParentRole>
      <Position>95</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>9955569 - Disclosure - Equity - Schedule of Share-Based Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityScheduleofShareBasedCompensationDetails</Role>
      <ShortName>Equity - Schedule of Share-Based Compensation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - Equity - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityNarrativeDetails</Role>
      <ShortName>Equity - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - Equity - Schedule of Options Outstanding from Consolidated Share Option Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityScheduleofOptionsOutstandingfromConsolidatedShareOptionPlanDetails</Role>
      <ShortName>Equity - Schedule of Options Outstanding from Consolidated Share Option Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - Equity - Schedule of Information about Share Options Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityScheduleofInformationaboutShareOptionsOutstandingDetails</Role>
      <ShortName>Equity - Schedule of Information about Share Options Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>9955573 - Disclosure - Equity - Schedule of Deferred Share Units for Common Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityScheduleofDeferredShareUnitsforCommonSharesDetails</Role>
      <ShortName>Equity - Schedule of Deferred Share Units for Common Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - Equity - Schedule of Restricted Share Units for Common Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/EquityScheduleofRestrictedShareUnitsforCommonSharesDetails</Role>
      <ShortName>Equity - Schedule of Restricted Share Units for Common Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - Commitments and contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/CommitmentsandcontingenciesDetails</Role>
      <ShortName>Commitments and contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Commitmentsandcontingencies</ParentRole>
      <Position>102</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - Disaggregation of revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/DisaggregationofrevenueDetails</Role>
      <ShortName>Disaggregation of revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ballard.com/role/DisaggregationofrevenueTables</ParentRole>
      <Position>103</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - Personnel expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/PersonnelexpensesDetails</Role>
      <ShortName>Personnel expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ballard.com/role/PersonnelexpensesTables</ParentRole>
      <Position>104</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - Other operating expense - Schedule of Other Operating Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/OtheroperatingexpenseScheduleofOtherOperatingExpenseDetails</Role>
      <ShortName>Other operating expense - Schedule of Other Operating Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>9955579 - Disclosure - Other operating expense - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/OtheroperatingexpenseNarrativeDetails</Role>
      <ShortName>Other operating expense - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>9955580 - Disclosure - Finance income and expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/FinanceincomeandexpenseDetails</Role>
      <ShortName>Finance income and expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ballard.com/role/FinanceincomeandexpenseTables</ParentRole>
      <Position>107</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>9955581 - Disclosure - Related party transactions - Schedule of Related Party Transactions and Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/RelatedpartytransactionsScheduleofRelatedPartyTransactionsandBalancesDetails</Role>
      <ShortName>Related party transactions - Schedule of Related Party Transactions and Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>9955582 - Disclosure - Related party transactions - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/RelatedpartytransactionsNarrativeDetails</Role>
      <ShortName>Related party transactions - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>9955583 - Disclosure - Related party transactions - Schedule of Key Management Personnel Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/RelatedpartytransactionsScheduleofKeyManagementPersonnelCompensationDetails</Role>
      <ShortName>Related party transactions - Schedule of Key Management Personnel Compensation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>9955584 - Disclosure - Impairment charges on goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/ImpairmentchargesongoodwillDetails</Role>
      <ShortName>Impairment charges on goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ballard.com/role/Impairmentchargesongoodwill</ParentRole>
      <Position>111</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>9955585 - Disclosure - Discontinued operations - Schedule of Net Loss from Discontinued Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/DiscontinuedoperationsScheduleofNetLossfromDiscontinuedOperationsDetails</Role>
      <ShortName>Discontinued operations - Schedule of Net Loss from Discontinued Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>9955586 - Disclosure - Discontinued operations - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/DiscontinuedoperationsNarrativeDetails</Role>
      <ShortName>Discontinued operations - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>113</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>9955587 - Disclosure - Discontinued operations - Schedule of Net Cash Flows from Discontinued Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/DiscontinuedoperationsScheduleofNetCashFlowsfromDiscontinuedOperationsDetails</Role>
      <ShortName>Discontinued operations - Schedule of Net Cash Flows from Discontinued Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>9955588 - Disclosure - Income taxes - Schedule of Components of Income Tax Benefit (Expense) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/IncometaxesScheduleofComponentsofIncomeTaxBenefitExpenseDetails</Role>
      <ShortName>Income taxes - Schedule of Components of Income Tax Benefit (Expense) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>9955589 - Disclosure - Income taxes - Schedule of Effective Income Tax Rate Differs from Combined Canadian Federal and Provincial Statutory Income Tax Rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/IncometaxesScheduleofEffectiveIncomeTaxRateDiffersfromCombinedCanadianFederalandProvincialStatutoryIncomeTaxRateDetails</Role>
      <ShortName>Income taxes - Schedule of Effective Income Tax Rate Differs from Combined Canadian Federal and Provincial Statutory Income Tax Rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>9955590 - Disclosure - Income taxes - Schedule of Unrecognized Deferred Tax Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/IncometaxesScheduleofUnrecognizedDeferredTaxAssetsDetails</Role>
      <ShortName>Income taxes - Schedule of Unrecognized Deferred Tax Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>117</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>9955591 - Disclosure - Income taxes - Schedule of Amount Available to Carry Forward (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/IncometaxesScheduleofAmountAvailabletoCarryForwardDetails</Role>
      <ShortName>Income taxes - Schedule of Amount Available to Carry Forward (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>118</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>9955592 - Disclosure - Supplemental disclosure of cash flow information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/SupplementaldisclosureofcashflowinformationDetails</Role>
      <ShortName>Supplemental disclosure of cash flow information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ballard.com/role/SupplementaldisclosureofcashflowinformationTables</ParentRole>
      <Position>119</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>9955593 - Disclosure - Operating segments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/OperatingsegmentsNarrativeDetails</Role>
      <ShortName>Operating segments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>120</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R121.htm</HtmlFileName>
      <LongName>9955594 - Disclosure - Operating segments - Schedule of Revenues from Continuing Operations and Non-Current Assets by Geographic Area (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/OperatingsegmentsScheduleofRevenuesfromContinuingOperationsandNonCurrentAssetsbyGeographicAreaDetails</Role>
      <ShortName>Operating segments - Schedule of Revenues from Continuing Operations and Non-Current Assets by Geographic Area (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>121</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R122.htm</HtmlFileName>
      <LongName>9955595 - Disclosure - Financial instruments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/FinancialinstrumentsNarrativeDetails</Role>
      <ShortName>Financial instruments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>122</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R123.htm</HtmlFileName>
      <LongName>9955596 - Disclosure - Financial instruments - Schedule of Increase (Decrease) in Fair Value Due to MTM and Foreign Exchange (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/FinancialinstrumentsScheduleofIncreaseDecreaseinFairValueDuetoMTMandForeignExchangeDetails</Role>
      <ShortName>Financial instruments - Schedule of Increase (Decrease) in Fair Value Due to MTM and Foreign Exchange (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>123</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R124.htm</HtmlFileName>
      <LongName>9955597 - Disclosure - Financial instruments - Schedule of Nature and Extent of Risks Arising from Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/FinancialinstrumentsScheduleofNatureandExtentofRisksArisingfromFinancialInstrumentsDetails</Role>
      <ShortName>Financial instruments - Schedule of Nature and Extent of Risks Arising from Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>124</Position>
    </Report>
    <Report instance="bldp-20251231_d2.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R125.htm</HtmlFileName>
      <LongName>9955598 - Disclosure - Financial instruments - Schedule of Movement in Allowance for Impairment in Respect of Trade Receivables and Contract Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ballard.com/role/FinancialinstrumentsScheduleofMovementinAllowanceforImpairmentinRespectofTradeReceivablesandContractAssetsDetails</Role>
      <ShortName>Financial instruments - Schedule of Movement in Allowance for Impairment in Respect of Trade Receivables and Contract Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>125</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="40-F" isDefinitelyFs="true" isIfrs="true" original="bldp-20251231_d2.htm">bldp-20251231_d2.htm</File>
    <File doctype="40-F" isDefinitelyFs="true" isIfrs="true" original="bldp-20251231.htm">bldp-20251231.htm</File>
    <File>bldp-20251231.xsd</File>
    <File>bldp-20251231_cal.xml</File>
    <File>bldp-20251231_def.xml</File>
    <File>bldp-20251231_lab.xml</File>
    <File>bldp-20251231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="57">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="1138">https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
