<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>351</ContextCount>
  <ElementCount>250</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>108</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>12</UnitCount>
  <MyReports>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/DocumentandEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952151 - Statement - CONSOLIDATED STATEMENTS OF INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/CONSOLIDATEDSTATEMENTSOFINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952152 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952153 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952154 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952155 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/CONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952156 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952157 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - General (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://kindermorgan.com/role/GeneralNotes</Role>
      <ShortName>General (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - Acquisitions (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://kindermorgan.com/role/AcquisitionsNotes</Role>
      <ShortName>Acquisitions (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - Debt (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://kindermorgan.com/role/DebtNotes</Role>
      <ShortName>Debt (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - Stockholders' Equity (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://kindermorgan.com/role/StockholdersEquityNotes</Role>
      <ShortName>Stockholders' Equity (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Risk Management (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementNotes</Role>
      <ShortName>Risk Management (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - Revenue Recognition (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://kindermorgan.com/role/RevenueRecognitionNotes</Role>
      <ShortName>Revenue Recognition (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Reportable Segments (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://kindermorgan.com/role/ReportableSegmentsNotes</Role>
      <ShortName>Reportable Segments (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - Income Taxes (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://kindermorgan.com/role/IncomeTaxesNotes</Role>
      <ShortName>Income Taxes (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - Litigation and Environmental (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://kindermorgan.com/role/LitigationandEnvironmentalNotes</Role>
      <ShortName>Litigation and Environmental (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - Recent Accounting Pronouncements (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://kindermorgan.com/role/RecentAccountingPronouncementsNotes</Role>
      <ShortName>Recent Accounting Pronouncements (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.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>19</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - General (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/GeneralPolicies</Role>
      <ShortName>General (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://kindermorgan.com/role/RecentAccountingPronouncementsNotes</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - General (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/GeneralTables</Role>
      <ShortName>General (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://kindermorgan.com/role/GeneralNotes</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - Acquisitions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/AcquisitionsTables</Role>
      <ShortName>Acquisitions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://kindermorgan.com/role/AcquisitionsNotes</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/DebtTables</Role>
      <ShortName>Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://kindermorgan.com/role/DebtNotes</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/StockholdersEquityTables</Role>
      <ShortName>Stockholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://kindermorgan.com/role/StockholdersEquityNotes</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - Risk Management (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementTables</Role>
      <ShortName>Risk Management (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://kindermorgan.com/role/RiskManagementNotes</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - Revenue Recognition (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RevenueRecognitionTables</Role>
      <ShortName>Revenue Recognition (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://kindermorgan.com/role/RevenueRecognitionNotes</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - Reportable Segments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/ReportableSegmentsTables</Role>
      <ShortName>Reportable Segments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://kindermorgan.com/role/ReportableSegmentsNotes</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://kindermorgan.com/role/IncomeTaxesNotes</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - General - Organization and Basis of Presentation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/GeneralOrganizationandBasisofPresentationDetails</Role>
      <ShortName>General - Organization and Basis of Presentation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - General - Schedule of EPS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/GeneralScheduleofEPSDetails</Role>
      <ShortName>General - Schedule of EPS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - General - Schedule of Antidilutive Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/GeneralScheduleofAntidilutiveSecuritiesDetails</Role>
      <ShortName>General - Schedule of Antidilutive Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - Acquisitions - Acquisitions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/AcquisitionsAcquisitionsDetails</Role>
      <ShortName>Acquisitions - Acquisitions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - Debt - Schedule of Debt Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/DebtScheduleofDebtOutstandingDetails</Role>
      <ShortName>Debt - Schedule of Debt Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - Debt - Credit Facilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/DebtCreditFacilitiesDetails</Role>
      <ShortName>Debt - Credit Facilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - Debt - Fair Value of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/DebtFairValueofFinancialInstrumentsDetails</Role>
      <ShortName>Debt - Fair Value of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - Stockholders' Equity - Common Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/StockholdersEquityCommonStockDetails</Role>
      <ShortName>Stockholders' Equity - Common Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - Stockholders' Equity - Accumulated Other Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/StockholdersEquityAccumulatedOtherComprehensiveLossDetails</Role>
      <ShortName>Stockholders' Equity - Accumulated Other Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - Risk Management - Energy Commodity Price Risk Management (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementEnergyCommodityPriceRiskManagementDetails</Role>
      <ShortName>Risk Management - Energy Commodity Price Risk Management (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - Risk Management - Interest Rate Risk Management (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementInterestRateRiskManagementDetails</Role>
      <ShortName>Risk Management - Interest Rate Risk Management (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - Risk Management - Foreign Currency Risk Management (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementForeignCurrencyRiskManagementDetails</Role>
      <ShortName>Risk Management - Foreign Currency Risk Management (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - Risk Management - Fair Value of Derivative Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementFairValueofDerivativeContractsDetails</Role>
      <ShortName>Risk Management - Fair Value of Derivative Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - Risk Management - Derivative Assets Input Level (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementDerivativeAssetsInputLevelDetails</Role>
      <ShortName>Risk Management - Derivative Assets Input Level (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - Risk Management - Derivative Liabilities Input Level (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementDerivativeLiabilitiesInputLevelDetails</Role>
      <ShortName>Risk Management - Derivative Liabilities Input Level (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - Risk Management - Effect of Derivative Contracts on the Income Statement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementEffectofDerivativeContractsontheIncomeStatementDetails</Role>
      <ShortName>Risk Management - Effect of Derivative Contracts on the Income Statement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - Risk Management - CF Hedging Effect on the Income Statements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementCFHedgingEffectontheIncomeStatementsDetails</Role>
      <ShortName>Risk Management - CF Hedging Effect on the Income Statements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - Risk Management - Effect on Income Statement Not Designated (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementEffectonIncomeStatementNotDesignatedDetails</Role>
      <ShortName>Risk Management - Effect on Income Statement Not Designated (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - Risk Management - Credit Risks (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RiskManagementCreditRisksDetails</Role>
      <ShortName>Risk Management - Credit Risks (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - Revenue Recognition - Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RevenueRecognitionDisaggregationofRevenueDetails</Role>
      <ShortName>Revenue Recognition - Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - Revenue Recognition - Contract Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RevenueRecognitionContractBalancesDetails</Role>
      <ShortName>Revenue Recognition - Contract Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - Revenue Recognition - Revenue Allocated to Remaining Performance Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/RevenueRecognitionRevenueAllocatedtoRemainingPerformanceObligationsDetails</Role>
      <ShortName>Revenue Recognition - Revenue Allocated to Remaining Performance Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - Reportable Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/ReportableSegmentsDetails</Role>
      <ShortName>Reportable Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://kindermorgan.com/role/ReportableSegmentsTables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://kindermorgan.com/role/IncomeTaxesTables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - Litigation and Environmental - Other Commercial Matters (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/LitigationandEnvironmentalOtherCommercialMattersDetails</Role>
      <ShortName>Litigation and Environmental - Other Commercial Matters (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - Litigation and Environmental - Portland Harbor (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/LitigationandEnvironmentalPortlandHarborDetails</Role>
      <ShortName>Litigation and Environmental - Portland Harbor (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - Litigation and Environmental - Lower Passaic River (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/LitigationandEnvironmentalLowerPassaicRiverDetails</Role>
      <ShortName>Litigation and Environmental - Lower Passaic River (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - Litigation and Environmental - Louisiana Governmental Coastal Zone Erosion Litigation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/LitigationandEnvironmentalLouisianaGovernmentalCoastalZoneErosionLitigationDetails</Role>
      <ShortName>Litigation and Environmental - Louisiana Governmental Coastal Zone Erosion Litigation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="kmi-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - Litigation and Environmental - Environmental Matters General (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://kindermorgan.com/role/LitigationandEnvironmentalEnvironmentalMattersGeneralDetails</Role>
      <ShortName>Litigation and Environmental - Environmental Matters General (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</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="kmi-20260331.htm">kmi-20260331.htm</File>
    <File>kmi-20260331.xsd</File>
    <File>kmi-20260331_cal.xml</File>
    <File>kmi-20260331_def.xml</File>
    <File>kmi-20260331_lab.xml</File>
    <File>kmi-20260331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>kmi-20260331_g1.gif</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="968">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="33">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>