<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.2.u1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>120</ContextCount>
  <ElementCount>152</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>35</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/DocumentandEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Statement - Statement of Net Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/StatementofNetIncomeUnaudited</Role>
      <ShortName>Statement of Net Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0000003 - Statement - Balance Sheet (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/BalanceSheetUnaudited</Role>
      <ShortName>Balance Sheet (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0000004 - Statement - Statement of Changes in Member's Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/StatementofChangesinMembersEquityUnaudited</Role>
      <ShortName>Statement of Changes in Member's Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0000005 - Statement - Statement of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/StatementofCashFlowsUnaudited</Role>
      <ShortName>Statement of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0000006 - Disclosure - Basis of Presentation (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://co.williams.com/role/BasisofPresentationNotes</Role>
      <ShortName>Basis of Presentation (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0000007 - Disclosure - Revenue Recognition (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://co.williams.com/role/RevenueRecognitionNotes</Role>
      <ShortName>Revenue Recognition (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0000008 - Disclosure - Contingent Liabilities and Commitments (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://co.williams.com/role/ContingentLiabilitiesandCommitmentsNotes</Role>
      <ShortName>Contingent Liabilities and Commitments (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0000009 - Disclosure - Debt and Financing Arrangements (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://co.williams.com/role/DebtandFinancingArrangementsNotes</Role>
      <ShortName>Debt and Financing Arrangements (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0000010 - Disclosure - ARO Trust (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://co.williams.com/role/AROTrustNotes</Role>
      <ShortName>ARO Trust (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0000011 - Disclosure - Fair Value Measurements (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://co.williams.com/role/FairValueMeasurementsNotes</Role>
      <ShortName>Fair Value Measurements (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0000012 - Disclosure - Transactions with Affiliates (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://co.williams.com/role/TransactionswithAffiliatesNotes</Role>
      <ShortName>Transactions with Affiliates (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9954471 - Disclosure - Revenue Recognition (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/RevenueRecognitionTables</Role>
      <ShortName>Revenue Recognition (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://co.williams.com/role/RevenueRecognitionNotes</ParentRole>
      <Position>13</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9954472 - Disclosure - ARO Trust (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/AROTrustTables</Role>
      <ShortName>ARO Trust (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://co.williams.com/role/AROTrustNotes</ParentRole>
      <Position>14</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9954473 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://co.williams.com/role/FairValueMeasurementsNotes</ParentRole>
      <Position>15</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9954474 - Disclosure - Revenue Recognition Contract Asset (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/RevenueRecognitionContractAssetDetails</Role>
      <ShortName>Revenue Recognition Contract Asset (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9954475 - Disclosure - Revenue Recogntion Contract Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/RevenueRecogntionContractLiabilitiesDetails</Role>
      <ShortName>Revenue Recogntion Contract Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9954476 - Disclosure - Revenue Recognition Contract Liabilities Performance Obligation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/RevenueRecognitionContractLiabilitiesPerformanceObligationDetails</Role>
      <ShortName>Revenue Recognition Contract Liabilities Performance Obligation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9954477 - Disclosure - Revenue Recognition Remaining Performance Obligation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/RevenueRecognitionRemainingPerformanceObligationDetails</Role>
      <ShortName>Revenue Recognition Remaining Performance Obligation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9954478 - Disclosure - Contingent Liabilities and Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/ContingentLiabilitiesandCommitmentsDetails</Role>
      <ShortName>Contingent Liabilities and Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://co.williams.com/role/ContingentLiabilitiesandCommitmentsNotes</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9954479 - Disclosure - Debt and Financing Arrangements - Credit Facility and Commercial Paper (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/DebtandFinancingArrangementsCreditFacilityandCommercialPaperDetails</Role>
      <ShortName>Debt and Financing Arrangements - Credit Facility and Commercial Paper (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9954480 - Disclosure - Debt and Financing Arrangements - Other Financing Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/DebtandFinancingArrangementsOtherFinancingObligationsDetails</Role>
      <ShortName>Debt and Financing Arrangements - Other Financing Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9954481 - Disclosure - ARO Trust (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/AROTrustDetails</Role>
      <ShortName>ARO Trust (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://co.williams.com/role/AROTrustTables</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9954482 - Disclosure - Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/FairValueMeasurementsDetails</Role>
      <ShortName>Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://co.williams.com/role/FairValueMeasurementsTables</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="tgpl-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9954483 - Disclosure - Transactions with Affiliates Related Party Transations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://co.williams.com/role/TransactionswithAffiliatesRelatedPartyTransationsDetails</Role>
      <ShortName>Transactions with Affiliates Related Party Transations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>25</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-Q" isDefinitelyFs="true" isUsgaap="true" original="tgpl-20240630.htm">tgpl-20240630.htm</File>
    <File>tgpl-20240630.xsd</File>
    <File>tgpl-20240630_cal.xml</File>
    <File>tgpl-20240630_def.xml</File>
    <File>tgpl-20240630_lab.xml</File>
    <File>tgpl-20240630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="379">http://fasb.org/us-gaap/2023</BaseTaxonomy>
    <BaseTaxonomy items="27">http://xbrl.sec.gov/dei/2023</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
