<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>241</ContextCount>
  <ElementCount>501</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>92</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>13</UnitCount>
  <MyReports>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>75000 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>75010 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>75020 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>75030 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/CONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>75040 - Statement - CONSOLIDATED STATEMENTS OF INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/CONSOLIDATEDSTATEMENTSOFINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>75060 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>75070 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>75080 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS(Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsparenthetical</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS(Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>75090 - Statement - CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NONCONTROLLING INTEREST</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/CONSOLIDATEDSTATEMENTSOFEQUITYANDREDEEMABLENONCONTROLLINGINTEREST</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NONCONTROLLING INTEREST</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>75100 - Statement - CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/CONSOLIDATEDSTATEMENTSOFEQUITYANDREDEEMABLENONCONTROLLINGINTERESTParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>75110 - Disclosure - Cybersecurity Risk Management, Strategy, and Governance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureCybersecurityRiskManagementStrategyAndGovernance</Role>
      <ShortName>Cybersecurity Risk Management, Strategy, and Governance</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.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>13</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995455 - Disclosure - Description of business, use of estimates, basis of presentation, and summary of significant accounting policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureDescriptionOfBusinessUseOfEstimatesBasisOfPresentationAndSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Description of business, use of estimates, basis of presentation, and summary of significant accounting policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995465 - Disclosure - Goodwill and other intangible assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/Goodwillandotherintangibleassets</Role>
      <ShortName>Goodwill and other intangible assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995475 - Disclosure - Investments and other assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/Investmentsandotherassets</Role>
      <ShortName>Investments and other assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995485 - Disclosure - Income taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/Incometaxes</Role>
      <ShortName>Income taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995495 - Disclosure - Long-term debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/Longtermdebt</Role>
      <ShortName>Long-term debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995505 - Disclosure - Retirement plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/Retirementplans</Role>
      <ShortName>Retirement plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995515 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995525 - Disclosure - Fair value measurement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/Fairvaluemeasurement</Role>
      <ShortName>Fair value measurement</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995535 - Disclosure - Shareholders' equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/Shareholdersequity</Role>
      <ShortName>Shareholders' equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995545 - Disclosure - Asset impairment and other</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/Assetimpairmentandother</Role>
      <ShortName>Asset impairment and other</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995555 - Disclosure - Other matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/Othermatters</Role>
      <ShortName>Other matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995575 - Disclosure - Description of business, use of estimates, basis of presentation, and summary of significant accounting policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureDescriptionOfBusinessUseOfEstimatesBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Description of business, use of estimates, basis of presentation, and summary of significant accounting policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995585 - Disclosure - Description of business, use of estimates, basis of presentation, and summary of significant accounting policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureDescriptionOfBusinessUseOfEstimatesBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Description of business, use of estimates, basis of presentation, and summary of significant accounting policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/DisclosureDescriptionOfBusinessUseOfEstimatesBasisOfPresentationAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995595 - Disclosure - Goodwill and other intangible assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/GoodwillandotherintangibleassetsTables</Role>
      <ShortName>Goodwill and other intangible assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/Goodwillandotherintangibleassets</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995605 - Disclosure - Investments and other assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/InvestmentsandotherassetsTables</Role>
      <ShortName>Investments and other assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/Investmentsandotherassets</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995615 - Disclosure - Income taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/IncometaxesTables</Role>
      <ShortName>Income taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/Incometaxes</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995625 - Disclosure - Long-term debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/LongtermdebtTables</Role>
      <ShortName>Long-term debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/Longtermdebt</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995635 - Disclosure - Retirement plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansTables</Role>
      <ShortName>Retirement plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/Retirementplans</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995645 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/Leases</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995655 - Disclosure - Fair value measurement (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/FairvaluemeasurementTables</Role>
      <ShortName>Fair value measurement (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/Fairvaluemeasurement</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995665 - Disclosure - Shareholders' equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/ShareholdersequityTables</Role>
      <ShortName>Shareholders' equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/Shareholdersequity</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995675 - Disclosure - Asset impairment and other (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/AssetimpairmentandotherTables</Role>
      <ShortName>Asset impairment and other (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/Assetimpairmentandother</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995685 - Disclosure - Other matters (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/OthermattersTables</Role>
      <ShortName>Other matters (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/Othermatters</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995695 - Disclosure - Description of business, use of estimates, basis of presentation, and summary of significant accounting policies - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureDescriptionOfBusinessUseOfEstimatesBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesNarrativeDetails</Role>
      <ShortName>Description of business, use of estimates, basis of presentation, and summary of significant accounting policies - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.tegna.com/20251231/taxonomy/role/DisclosureDescriptionOfBusinessUseOfEstimatesBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995705 - Disclosure - Description of business, use of estimates, basis of presentation, and summary of significant accounting policies - Reconciliations Between Revenue and Primary Measures of Profit or Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureDescriptionOfBusinessUseOfEstimatesBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesReconciliationsBetweenRevenueAndP</Role>
      <ShortName>Description of business, use of estimates, basis of presentation, and summary of significant accounting policies - Reconciliations Between Revenue and Primary Measures of Profit or Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995715 - Disclosure - Description of business, use of estimates, basis of presentation, and summary of significant accounting policies - Schedule of Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureDescriptionOfBusinessUseOfEstimatesBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesScheduleOfDisaggregationOfRevenue</Role>
      <ShortName>Description of business, use of estimates, basis of presentation, and summary of significant accounting policies - Schedule of Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995725 - Disclosure - Goodwill and other intangible assets - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/GoodwillandotherintangibleassetsNarrativeDetails</Role>
      <ShortName>Goodwill and other intangible assets - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995735 - Disclosure - Goodwill and other intangible assets - Schedule of Indefinite-Lived Intangible Assets, and Amortizable Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/GoodwillandotherintangibleassetsScheduleofIndefiniteLivedIntangibleAssetsandAmortizableIntangibleAssetsDetails</Role>
      <ShortName>Goodwill and other intangible assets - Schedule of Indefinite-Lived Intangible Assets, and Amortizable Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995755 - Disclosure - Goodwill and other intangible assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/GoodwillandotherintangibleassetsScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseDetails</Role>
      <ShortName>Goodwill and other intangible assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995775 - Disclosure - Investments and other assets - Components of Investments and Other Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureInvestmentsAndOtherAssetsComponentsOfInvestmentsAndOtherAssetsDetails</Role>
      <ShortName>Investments and other assets - Components of Investments and Other Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995785 - Disclosure - Investments and other assets - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/InvestmentsandotherassetsNarrativeDetails</Role>
      <ShortName>Investments and other assets - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995795 - Disclosure - Income taxes - Schedule of Provision (Benefit) for Income Taxes on Income Consists (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/IncometaxesScheduleofProvisionBenefitforIncomeTaxesonIncomeConsistsDetails</Role>
      <ShortName>Income taxes - Schedule of Provision (Benefit) for Income Taxes on Income Consists (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995805 - Disclosure - Income taxes - Schedule of Reconciliation of Effective Tax Rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/IncometaxesScheduleofReconciliationofEffectiveTaxRateDetails</Role>
      <ShortName>Income taxes - Schedule of Reconciliation of Effective Tax Rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995825 - Disclosure - Income taxes - Schedule of Reconciliation of Effective Tax Rate (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfEffectiveTaxRateParentheticalDetails</Role>
      <ShortName>Income taxes - Schedule of Reconciliation of Effective Tax Rate (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995835 - Disclosure - Income taxes - Schedule of Deferred Tax Liabilities and Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/IncometaxesScheduleofDeferredTaxLiabilitiesandAssetsDetails</Role>
      <ShortName>Income taxes - Schedule of Deferred Tax Liabilities and Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995845 - Disclosure - Income taxes - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/IncometaxesNarrativeDetails</Role>
      <ShortName>Income taxes - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995855 - Disclosure - Income taxes - Schedule of Valuation Allowances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/IncometaxesScheduleofValuationAllowancesDetails</Role>
      <ShortName>Income taxes - Schedule of Valuation Allowances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995865 - Disclosure - Income taxes - Schedule of Activity Related to Unrecognized Tax Benefits, Excluding Federal Tax Benefit of State Tax Deductions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/IncometaxesScheduleofActivityRelatedtoUnrecognizedTaxBenefitsExcludingFederalTaxBenefitofStateTaxDeductionsDetails</Role>
      <ShortName>Income taxes - Schedule of Activity Related to Unrecognized Tax Benefits, Excluding Federal Tax Benefit of State Tax Deductions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995875 - Disclosure - Income taxes - Schedule of Cash Paid for Income Taxes, Net of Refunds Received (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureIncomeTaxesScheduleOfCashPaidForIncomeTaxesNetOfRefundsReceivedDetails</Role>
      <ShortName>Income taxes - Schedule of Cash Paid for Income Taxes, Net of Refunds Received (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995885 - Disclosure - Long-term debt - Schedule of Long-Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureLongtermDebtScheduleOfLongtermDebtDetails</Role>
      <ShortName>Long-term debt - Schedule of Long-Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995895 - Disclosure - Long-term debt - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/LongtermdebtNarrativeDetails</Role>
      <ShortName>Long-term debt - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995905 - Disclosure - Long-term debt - Schedule of Annual Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/LongtermdebtScheduleofAnnualMaturitiesDetails</Role>
      <ShortName>Long-term debt - Schedule of Annual Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995915 - Disclosure - Retirement plans - Schedule of Pension Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansScheduleofPensionCostsDetails</Role>
      <ShortName>Retirement plans - Schedule of Pension Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995925 - Disclosure - Retirement plans - Schedule of Changes in Projected Benefit Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansScheduleofChangesinProjectedBenefitObligationsDetails</Role>
      <ShortName>Retirement plans - Schedule of Changes in Projected Benefit Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>995935 - Disclosure - Retirement plans - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansNarrativeDetails</Role>
      <ShortName>Retirement plans - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>995945 - Disclosure - Retirement plans - Schedule of Net Funded Status (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansScheduleofNetFundedStatusDetails</Role>
      <ShortName>Retirement plans - Schedule of Net Funded Status (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>995955 - Disclosure - Retirement plans - Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansScheduleofAccumulatedBenefitObligationsinExcessofFairValueofPlanAssetsDetails</Role>
      <ShortName>Retirement plans - Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>995965 - Disclosure - Retirement plans - Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansScheduleofBenefitObligationsinExcessofFairValueofPlanAssetsDetails</Role>
      <ShortName>Retirement plans - Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>995975 - Disclosure - Retirement plans - Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansScheduleofNetPeriodicBenefitCostNotYetRecognizedDetails</Role>
      <ShortName>Retirement plans - Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>995985 - Disclosure - Retirement plans - Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansScheduleofDefinedBenefitPlanAmountsRecognizedinOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>Retirement plans - Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>995995 - Disclosure - Retirement plans - Schedule of Assumptions Used (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansScheduleofAssumptionsUsedDetails</Role>
      <ShortName>Retirement plans - Schedule of Assumptions Used (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996005 - Disclosure - Retirement plans - Schedule of Assumptions Used in Calculating Pension Benefit Obligations Table (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansScheduleofAssumptionsUsedinCalculatingPensionBenefitObligationsTableDetails</Role>
      <ShortName>Retirement plans - Schedule of Assumptions Used in Calculating Pension Benefit Obligations Table (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996015 - Disclosure - Retirement plans - Schedule of Allocation of Plan Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansScheduleofAllocationofPlanAssetsDetails</Role>
      <ShortName>Retirement plans - Schedule of Allocation of Plan Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996035 - Disclosure - Retirement plans - Schedule of Expected Benefit Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/RetirementplansScheduleofExpectedBenefitPaymentsDetails</Role>
      <ShortName>Retirement plans - Schedule of Expected Benefit Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996045 - Disclosure - Leases - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/LeasesNarrativeDetails</Role>
      <ShortName>Leases - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996055 - Disclosure - Leases - Schedule of Lessee, Operating Leases, Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/LeasesScheduleofLesseeOperatingLeasesAssetsandLiabilitiesDetails</Role>
      <ShortName>Leases - Schedule of Lessee, Operating Leases, Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996065 - Disclosure - Leases - Schedule of Future Rent Payments on Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/LeasesScheduleofFutureRentPaymentsonLeaseLiabilitiesDetails</Role>
      <ShortName>Leases - Schedule of Future Rent Payments on Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996075 - Disclosure - Fair value measurement - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/FairvaluemeasurementNarrativeDetails</Role>
      <ShortName>Fair value measurement - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996085 - Disclosure - Fair value measurement - Schedule of Fair Value of Pension Plan Assets by Level within Fair Value Hierarchy (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/FairvaluemeasurementScheduleofFairValueofPensionPlanAssetsbyLevelwithinFairValueHierarchyDetails</Role>
      <ShortName>Fair value measurement - Schedule of Fair Value of Pension Plan Assets by Level within Fair Value Hierarchy (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996095 - Disclosure - Shareholders' equity - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/ShareholdersequityNarrativeDetails</Role>
      <ShortName>Shareholders' equity - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996105 - Disclosure - Shareholders' equity - Schedule of Earnings Per Share (Basic and Diluted) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureShareholdersEquityScheduleOfEarningsPerShareBasicAndDilutedDetails</Role>
      <ShortName>Shareholders' equity - Schedule of Earnings Per Share (Basic and Diluted) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996115 - Disclosure - Shareholders' equity - Schedule of Stock-Based Compensation Related Amounts Recognized in the Consolidated Statements of Income for Equity Awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/ShareholdersequityScheduleofStockBasedCompensationRelatedAmountsRecognizedintheConsolidatedStatementsofIncomeforEquityAwardsDetails</Role>
      <ShortName>Shareholders' equity - Schedule of Stock-Based Compensation Related Amounts Recognized in the Consolidated Statements of Income for Equity Awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>996125 - Disclosure - Shareholders' equity - Schedule of Restricted Stock and RSU Awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/ShareholdersequityScheduleofRestrictedStockandRSUAwardsDetails</Role>
      <ShortName>Shareholders' equity - Schedule of Restricted Stock and RSU Awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>996135 - Disclosure - Shareholders' equity - Schedule of RSAs Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/DisclosureShareholdersEquityScheduleOfRsasActivityDetails</Role>
      <ShortName>Shareholders' equity - Schedule of RSAs Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>996145 - Disclosure - Shareholders' equity - Schedule of Nonvested Performance-based Units Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/ShareholdersequityScheduleofNonvestedPerformancebasedUnitsActivityDetails</Role>
      <ShortName>Shareholders' equity - Schedule of Nonvested Performance-based Units Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>996155 - Disclosure - Shareholders' equity - Schedule of Accumulated Other Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/ShareholdersequityScheduleofAccumulatedOtherComprehensiveLossDetails</Role>
      <ShortName>Shareholders' equity - Schedule of Accumulated Other Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>996165 - Disclosure - Shareholders' equity - Schedule of Reclassification out of Accumulated Other Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/ShareholdersequityScheduleofReclassificationoutofAccumulatedOtherComprehensiveLossDetails</Role>
      <ShortName>Shareholders' equity - Schedule of Reclassification out of Accumulated Other Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>996175 - Disclosure - Asset impairment and other - Schedule of Facility Consolidation and Asset Impairment Charges (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/AssetimpairmentandotherScheduleofFacilityConsolidationandAssetImpairmentChargesDetails</Role>
      <ShortName>Asset impairment and other - Schedule of Facility Consolidation and Asset Impairment Charges (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>996185 - Disclosure - Asset impairment and other - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/AssetimpairmentandotherNarrativeDetails</Role>
      <ShortName>Asset impairment and other - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>996195 - Disclosure - Other matters - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/OthermattersNarrativeDetails</Role>
      <ShortName>Other matters - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="tgna-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>996205 - Disclosure - Other matters - Schedule of Recorded Unconditional Purchase Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tegna.com/20251231/taxonomy/role/OthermattersScheduleofRecordedUnconditionalPurchaseObligationsDetails</Role>
      <ShortName>Other matters - Schedule of Recorded Unconditional Purchase Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</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="tgna-20251231.htm">tgna-20251231.htm</File>
    <File>tgna-20251231.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img33178042_0.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="5">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="1177">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="13">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="39">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
