<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>261</ContextCount>
  <ElementCount>521</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>95</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - Auditor Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/AuditorInformation</Role>
      <ShortName>Auditor Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952151 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952152 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952153 - Statement - Consolidated Statements of Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedStatementsofShareholdersEquity</Role>
      <ShortName>Consolidated Statements of Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952154 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedStatementsofOperations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952155 - Statement - Consolidated Statements of Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedStatementsofComprehensiveIncomeLoss</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952156 - Statement - Consolidated Statements of Comprehensive Income (Loss) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedStatementsofComprehensiveIncomeLossParenthetical</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Loss) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952157 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedStatementsofCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimates</Role>
      <ShortName>Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - Adoption of Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/AdoptionofAccountingPolicies</Role>
      <ShortName>Adoption of Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - Discontinued Operations and Disposal Groups</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/DiscontinuedOperationsandDisposalGroups</Role>
      <ShortName>Discontinued Operations and Disposal Groups</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - Fair Value Measurements, Cash, Cash Equivalents and Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/FairValueMeasurementsCashCashEquivalentsandInvestments</Role>
      <ShortName>Fair Value Measurements, Cash, Cash Equivalents and Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Consolidated Balance Sheets Details</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsDetails</Role>
      <ShortName>Consolidated Balance Sheets Details</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Debentures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/Debentures</Role>
      <ShortName>Debentures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - Capital Stock</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CapitalStock</Role>
      <ShortName>Capital Stock</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - Earnings (Loss) Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/EarningsLossPerShare</Role>
      <ShortName>Earnings (Loss) Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - Accumulated Other Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/AccumulatedOtherComprehensiveLoss</Role>
      <ShortName>Accumulated Other Comprehensive Loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - Revenue and Segment Disclosures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/RevenueandSegmentDisclosures</Role>
      <ShortName>Revenue and Segment Disclosures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - Cash Flow and Additional Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CashFlowandAdditionalInformation</Role>
      <ShortName>Cash Flow and Additional Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.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>25</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.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>26</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimatesPolicies</Role>
      <ShortName>Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimates</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimatesTables</Role>
      <ShortName>Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimates</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - Discontinued Operations and Disposal Groups (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/DiscontinuedOperationsandDisposalGroupsTables</Role>
      <ShortName>Discontinued Operations and Disposal Groups (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://blackberry.com/role/DiscontinuedOperationsandDisposalGroups</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - Fair Value Measurements, Cash, Cash Equivalent and Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/FairValueMeasurementsCashCashEquivalentandInvestmentsTables</Role>
      <ShortName>Fair Value Measurements, Cash, Cash Equivalent and Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - Consolidated Balance Sheets Details (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsDetailsTables</Role>
      <ShortName>Consolidated Balance Sheets Details (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://blackberry.com/role/ConsolidatedBalanceSheetsDetails</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://blackberry.com/role/IncomeTaxes</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - Debentures (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/DebenturesTables</Role>
      <ShortName>Debentures (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://blackberry.com/role/Debentures</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - Capital Stock (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CapitalStockTables</Role>
      <ShortName>Capital Stock (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://blackberry.com/role/CapitalStock</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - Earnings (Loss) Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/EarningsLossPerShareTables</Role>
      <ShortName>Earnings (Loss) Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://blackberry.com/role/EarningsLossPerShare</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - Accumulated Other Comprehensive Loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/AccumulatedOtherComprehensiveLossTables</Role>
      <ShortName>Accumulated Other Comprehensive Loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://blackberry.com/role/AccumulatedOtherComprehensiveLoss</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - Leases, Codification Topic 842 (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/LeasesCodificationTopic842Tables</Role>
      <ShortName>Leases, Codification Topic 842 (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - Revenue and Segment Disclosure (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/RevenueandSegmentDisclosureTables</Role>
      <ShortName>Revenue and Segment Disclosure (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://blackberry.com/role/RevenueandSegmentDisclosures</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - Cash Flow and Additional Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CashFlowandAdditionalInformationTables</Role>
      <ShortName>Cash Flow and Additional Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://blackberry.com/role/CashFlowandAdditionalInformation</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimatesAdditionalInformationDetails</Role>
      <ShortName>Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Property, plant and equipment, net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimatesPropertyplantandequipmentnetDetails</Role>
      <ShortName>Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Property, plant and equipment, net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Schedule of Finite-Lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimatesScheduleofFiniteLivedIntangibleAssetsDetails</Role>
      <ShortName>Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Schedule of Finite-Lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Revenue Recognition, Multiple-Deliverable Arrangements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimatesRevenueRecognitionMultipleDeliverableArrangementsDetails</Role>
      <ShortName>Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Revenue Recognition, Multiple-Deliverable Arrangements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Stock-based Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimatesStockbasedCompensationDetails</Role>
      <ShortName>Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Stock-based Compensation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Vesting Scenarios (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimatesVestingScenariosDetails</Role>
      <ShortName>Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Vesting Scenarios (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/BlackberryLimitedandSummaryofSignificantAccountingPoliciesandCriticalAccountingEstimatesTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - Discontinued Operations (Details) - Additional Details</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/DiscontinuedOperationsDetailsAdditionalDetails</Role>
      <ShortName>Discontinued Operations (Details) - Additional Details</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/DiscontinuedOperationsandDisposalGroupsTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - Discontinued Operations (Details) - Statement of Operation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/DiscontinuedOperationsDetailsStatementofOperation</Role>
      <ShortName>Discontinued Operations (Details) - Statement of Operation</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/DiscontinuedOperationsandDisposalGroupsTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - Discontinued Operations (Details) - Statement of Cash Flow</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/DiscontinuedOperationsDetailsStatementofCashFlow</Role>
      <ShortName>Discontinued Operations (Details) - Statement of Cash Flow</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/DiscontinuedOperationsandDisposalGroupsTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - Fair Value Measurements - Non-Recurring Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/FairValueMeasurementsNonRecurringFairValueMeasurementsDetails</Role>
      <ShortName>Fair Value Measurements - Non-Recurring Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/FairValueMeasurementsSummaryofChangesinFairValueofCompanysLevel3AssetsDetail</Role>
      <ShortName>Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - Cash, Cash Equivalents and Investments - Components of Cash, Cash Equivalents and Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CashCashEquivalentsandInvestmentsComponentsofCashCashEquivalentsandInvestmentsDetails</Role>
      <ShortName>Cash, Cash Equivalents and Investments - Components of Cash, Cash Equivalents and Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent Presented in the Consolidated Statements of Cash Flow (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CashCashEquivalentRestrictedCashandRestrictedCashEquivalentPresentedintheConsolidatedStatementsofCashFlowDetails</Role>
      <ShortName>Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent Presented in the Consolidated Statements of Cash Flow (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - Cash, Cash Equivalents and Investments - Contractual Maturities of Available-for-Sale Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CashCashEquivalentsandInvestmentsContractualMaturitiesofAvailableforSaleInvestmentsDetails</Role>
      <ShortName>Cash, Cash Equivalents and Investments - Contractual Maturities of Available-for-Sale Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - Cash, Cash Equivalents and Investments - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CashCashEquivalentsandInvestmentsAdditionalInformationDetails</Role>
      <ShortName>Cash, Cash Equivalents and Investments - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - Consolidated Balance Sheets Details - Accounts Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsDetailsAccountsReceivableDetails</Role>
      <ShortName>Consolidated Balance Sheets Details - Accounts Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - Consolidated Balance Sheets Details - Other Current Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsDetailsOtherCurrentAssetsDetails</Role>
      <ShortName>Consolidated Balance Sheets Details - Other Current Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - Consolidated Balance Sheets Detail - Property, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsDetailPropertyPlantandEquipmentDetails</Role>
      <ShortName>Consolidated Balance Sheets Detail - Property, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - Consolidated Balance Sheets Detail - Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsDetailIntangibleAssetsDetails</Role>
      <ShortName>Consolidated Balance Sheets Detail - Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - Consolidated Balance Sheets Details Consolidated Balance Sheet Details - Intangibles Assets Useful Life (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsDetailsConsolidatedBalanceSheetDetailsIntangiblesAssetsUsefulLifeDetails</Role>
      <ShortName>Consolidated Balance Sheets Details Consolidated Balance Sheet Details - Intangibles Assets Useful Life (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - Consolidated Balance Sheets Details Consolidated Balance Sheet Details - Changes to Carrying Amount of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsDetailsConsolidatedBalanceSheetDetailsChangestoCarryingAmountofGoodwillDetails</Role>
      <ShortName>Consolidated Balance Sheets Details Consolidated Balance Sheet Details - Changes to Carrying Amount of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - Consolidated Balance Sheets Detail - Accrued Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsDetailAccruedLiabilitiesDetails</Role>
      <ShortName>Consolidated Balance Sheets Detail - Accrued Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - Consolidated Balance Sheets Detail - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsDetailAdditionalInformationDetails</Role>
      <ShortName>Consolidated Balance Sheets Detail - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - Consolidated Balance Sheets Details (Details) - Restructuring</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/ConsolidatedBalanceSheetsDetailsDetailsRestructuring</Role>
      <ShortName>Consolidated Balance Sheets Details (Details) - Restructuring</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/ConsolidatedBalanceSheetsDetailsTables</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - Income Taxes -Income Taxes - Schedule of Reconciliation of Provision for Income Taxes After the Adoption of ASU 2023 -09 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesIncomeTaxesScheduleofReconciliationofProvisionforIncomeTaxesAftertheAdoptionofASU202309Details</Role>
      <ShortName>Income Taxes -Income Taxes - Schedule of Reconciliation of Provision for Income Taxes After the Adoption of ASU 2023 -09 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - Income Taxes - Components of Provision for (Recovery of) Income Tax and Income from Continuing Operations Before Income Tax (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesComponentsofProvisionforRecoveryofIncomeTaxandIncomefromContinuingOperationsBeforeIncomeTaxDetails</Role>
      <ShortName>Income Taxes - Components of Provision for (Recovery of) Income Tax and Income from Continuing Operations Before Income Tax (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - Income Taxes - Income (Loss) from Continuing Operations Before Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesIncomeLossfromContinuingOperationsBeforeIncomeTaxesDetails</Role>
      <ShortName>Income Taxes - Income (Loss) from Continuing Operations Before Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - Income Taxes - Provision for Income Taxes from Continuing Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesProvisionforIncomeTaxesfromContinuingOperationsDetails</Role>
      <ShortName>Income Taxes - Provision for Income Taxes from Continuing Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesComponentsofDeferredIncomeTaxAssetsandLiabilitiesDetails</Role>
      <ShortName>Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - Income Taxes Income Taxes - Valuation Allowance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesIncomeTaxesValuationAllowanceDetails</Role>
      <ShortName>Income Taxes Income Taxes - Valuation Allowance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Income Tax Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesReconciliationofBeginningandEndingAmountofUnrecognizedIncomeTaxBenefitsDetails</Role>
      <ShortName>Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Income Tax Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - Income Taxes - Summary of Open Tax Years by Major Jurisdiction (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesSummaryofOpenTaxYearsbyMajorJurisdictionDetails</Role>
      <ShortName>Income Taxes - Summary of Open Tax Years by Major Jurisdiction (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - Income Taxes Income Taxes - Summary of Net Operating Loss and Tax Credits Carryforwards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesIncomeTaxesSummaryofNetOperatingLossandTaxCreditsCarryforwardsDetails</Role>
      <ShortName>Income Taxes Income Taxes - Summary of Net Operating Loss and Tax Credits Carryforwards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - Income Taxes - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesAdditionalInformationDetails</Role>
      <ShortName>Income Taxes - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - Income Taxes - Schedule of Cash Taxes Paid (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/IncomeTaxesScheduleofCashTaxesPaidDetails</Role>
      <ShortName>Income Taxes - Schedule of Cash Taxes Paid (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - Debentures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/DebenturesDetails</Role>
      <ShortName>Debentures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/DebenturesTables</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - Debentures - Impact of Changes in Fair Value of Debentures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/DebenturesImpactofChangesinFairValueofDebenturesDetails</Role>
      <ShortName>Debentures - Impact of Changes in Fair Value of Debentures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - Capital Stock - Changes in Issued and Outstanding Common Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CapitalStockChangesinIssuedandOutstandingCommonSharesDetails</Role>
      <ShortName>Capital Stock - Changes in Issued and Outstanding Common Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - Capital Stock - Restricted Share Unit Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CapitalStockRestrictedShareUnitActivityDetails</Role>
      <ShortName>Capital Stock - Restricted Share Unit Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - Capital Stock - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CapitalStockAdditionalInformationDetails</Role>
      <ShortName>Capital Stock - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - Earnings (Loss) Per Share - Summary of Basic and Diluted Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/EarningsLossPerShareSummaryofBasicandDilutedEarningsPerShareDetails</Role>
      <ShortName>Earnings (Loss) Per Share - Summary of Basic and Diluted Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/EarningsLossPerShareTables</ParentRole>
      <Position>80</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/AccumulatedOtherComprehensiveLossComponentsofAccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - Accumulated Other Comprehensive Loss - Location of Loss Reclassified from AOCI into Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/AccumulatedOtherComprehensiveLossLocationofLossReclassifiedfromAOCIintoIncomeDetails</Role>
      <ShortName>Accumulated Other Comprehensive Loss - Location of Loss Reclassified from AOCI into Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - Commitments and Contingencies - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CommitmentsandContingenciesAdditionalInformationDetails</Role>
      <ShortName>Commitments and Contingencies - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - Leases (Components of Operating Lease Expense) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/LeasesComponentsofOperatingLeaseExpenseDetails</Role>
      <ShortName>Leases (Components of Operating Lease Expense) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/LeasesCodificationTopic842Tables</ParentRole>
      <Position>84</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - Leases (Supplemental Cash Flow Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/LeasesSupplementalCashFlowInformationDetails</Role>
      <ShortName>Leases (Supplemental Cash Flow Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/LeasesCodificationTopic842Tables</ParentRole>
      <Position>85</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - Leases (Supplemental Balance Sheet Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/LeasesSupplementalBalanceSheetInformationDetails</Role>
      <ShortName>Leases (Supplemental Balance Sheet Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/LeasesCodificationTopic842Tables</ParentRole>
      <Position>86</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - Leases (Weighted Average Remaining Lease term and Discount Rate) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/LeasesWeightedAverageRemainingLeasetermandDiscountRateDetails</Role>
      <ShortName>Leases (Weighted Average Remaining Lease term and Discount Rate) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/LeasesCodificationTopic842Tables</ParentRole>
      <Position>87</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955579 - Disclosure - Leases (Maturities of Undiscounted Lease Liabilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/LeasesMaturitiesofUndiscountedLeaseLiabilitiesDetails</Role>
      <ShortName>Leases (Maturities of Undiscounted Lease Liabilities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/LeasesCodificationTopic842Tables</ParentRole>
      <Position>88</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955580 - Disclosure - Leases (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/LeasesAdditionalInformationDetails</Role>
      <ShortName>Leases (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://blackberry.com/role/LeasesCodificationTopic842Tables</ParentRole>
      <Position>89</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955581 - Disclosure - Revenue and Segment Disclosures - Operating results by operating segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/RevenueandSegmentDisclosuresOperatingresultsbyoperatingsegmentsDetails</Role>
      <ShortName>Revenue and Segment Disclosures - Operating results by operating segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955582 - Disclosure - Revenue and Segment Disclosures - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/RevenueandSegmentDisclosuresReconciliationofOperatingProfitLossfromSegmentstoConsolidatedDetails</Role>
      <ShortName>Revenue and Segment Disclosures - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955583 - Disclosure - Revenue and Segment Disclosures - Revenue from External Customers by Geographic Areas (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/RevenueandSegmentDisclosuresRevenuefromExternalCustomersbyGeographicAreasDetails</Role>
      <ShortName>Revenue and Segment Disclosures - Revenue from External Customers by Geographic Areas (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955584 - Disclosure - Revenue and Segment Disclosures Revenue classified by timing of recognition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/RevenueandSegmentDisclosuresRevenueclassifiedbytimingofrecognitionDetails</Role>
      <ShortName>Revenue and Segment Disclosures Revenue classified by timing of recognition (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955585 - Disclosure - Revenue and Segment Disclosures Revenue Contract Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/RevenueandSegmentDisclosuresRevenueContractBalancesDetails</Role>
      <ShortName>Revenue and Segment Disclosures Revenue Contract Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>9955586 - Disclosure - Revenue and Segment Disclosures -Transaction price allocated to the remaining performance obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/RevenueandSegmentDisclosuresTransactionpriceallocatedtotheremainingperformanceobligationsDetails</Role>
      <ShortName>Revenue and Segment Disclosures -Transaction price allocated to the remaining performance obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>9955587 - Disclosure - Revenue and Segment Disclosures - Long-lived Assets and Total Assets by Geographic Areas (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/RevenueandSegmentDisclosuresLonglivedAssetsandTotalAssetsbyGeographicAreasDetails</Role>
      <ShortName>Revenue and Segment Disclosures - Long-lived Assets and Total Assets by Geographic Areas (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>9955588 - Disclosure - Revenue and Segment Disclosures - Additional Details (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/RevenueandSegmentDisclosuresAdditionalDetailsDetails</Role>
      <ShortName>Revenue and Segment Disclosures - Additional Details (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>9955589 - Disclosure - Cash Flow and Additional Information - Interest and Income Taxes Paid (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CashFlowandAdditionalInformationInterestandIncomeTaxesPaidDetails</Role>
      <ShortName>Cash Flow and Additional Information - Interest and Income Taxes Paid (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="bbry-20260228.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>9955590 - Disclosure - Cash Flow and Additional Information - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://blackberry.com/role/CashFlowandAdditionalInformationAdditionalInformationDetails</Role>
      <ShortName>Cash Flow and Additional Information - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="bbry-20260228.htm">bbry-20260228.htm</File>
    <File>bbry-20260228.xsd</File>
    <File>bbry-20260228_cal.xml</File>
    <File>bbry-20260228_def.xml</File>
    <File>bbry-20260228_lab.xml</File>
    <File>bbry-20260228_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>bbry-20260228_g1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2026</BaseTaxonomy>
    <BaseTaxonomy items="1237">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="14">http://xbrl.sec.gov/cyd/2026</BaseTaxonomy>
    <BaseTaxonomy items="41">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="6">http://xbrl.sec.gov/ecd/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
