<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.23.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>409</ContextCount>
  <ElementCount>327</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>140</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>11</UnitCount>
  <MyReports>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Statement - Consolidated Income Statement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/ConsolidatedIncomeStatement</Role>
      <ShortName>Consolidated Income Statement</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0000003 - Statement - Consolidated Statement of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/ConsolidatedStatementofComprehensiveIncome</Role>
      <ShortName>Consolidated Statement of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0000004 - Statement - Consolidated Balance Sheet</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/ConsolidatedBalanceSheet</Role>
      <ShortName>Consolidated Balance Sheet</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0000005 - Statement - Consolidated Balance Sheet (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/ConsolidatedBalanceSheetParenthetical</Role>
      <ShortName>Consolidated Balance Sheet (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0000006 - Statement - Consolidated Statement of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/ConsolidatedStatementofCashFlows</Role>
      <ShortName>Consolidated Statement of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0000007 - Statement - Consolidated Statement of Cash Flows (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/ConsolidatedStatementofCashFlowsParenthetical</Role>
      <ShortName>Consolidated Statement of Cash Flows (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0000008 - Disclosure - Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/BasisofPresentation</Role>
      <ShortName>Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0000009 - Disclosure - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/Inventories</Role>
      <ShortName>Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0000010 - Disclosure - Acquisitions and Dispositions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/AcquisitionsandDispositions</Role>
      <ShortName>Acquisitions and Dispositions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0000011 - Disclosure - Investments and Long-Term Receivables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/InvestmentsandLongTermReceivables</Role>
      <ShortName>Investments and Long-Term Receivables</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0000012 - Disclosure - Investment in Cenovus Energy</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/InvestmentinCenovusEnergy</Role>
      <ShortName>Investment in Cenovus Energy</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0000013 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0000014 - Disclosure - Changes in Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/ChangesinEquity</Role>
      <ShortName>Changes in Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0000015 - Disclosure - Guarantees</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/Guarantees</Role>
      <ShortName>Guarantees</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0000016 - Disclosure - Contingencies and Commitments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/ContingenciesandCommitments</Role>
      <ShortName>Contingencies and Commitments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0000017 - Disclosure - Derivative and Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/DerivativeandFinancialInstruments</Role>
      <ShortName>Derivative and Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0000018 - Disclosure - Fair Value Measurement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/FairValueMeasurement</Role>
      <ShortName>Fair Value Measurement</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0000019 - Disclosure - Suspended Wells</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SuspendedWells</Role>
      <ShortName>Suspended Wells</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>0000020 - Disclosure - Accumulated Other Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/AccumulatedOtherComprehensiveLoss</Role>
      <ShortName>Accumulated Other Comprehensive Loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>0000021 - Disclosure - Cash Flow Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/CashFlowInformation</Role>
      <ShortName>Cash Flow Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>0000022 - Disclosure - Employee Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/EmployeeBenefitPlans</Role>
      <ShortName>Employee Benefit Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>0000023 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>0000024 - Disclosure - Sales and Other Operating Revenues</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SalesandOtherOperatingRevenues</Role>
      <ShortName>Sales and Other Operating Revenues</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>0000025 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/EarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>0000026 - Disclosure - Segment Disclosures and Related Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SegmentDisclosuresandRelatedInformation</Role>
      <ShortName>Segment Disclosures and Related Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>0000027 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.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>28</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.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>29</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9954471 - Disclosure - Basis of Presentation (Policy)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/BasisofPresentationPolicy</Role>
      <ShortName>Basis of Presentation (Policy)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9954472 - Disclosure - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/InventoriesTables</Role>
      <ShortName>Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/Inventories</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9954473 - Disclosure - Acquisitions and Dispositions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/AcquisitionsandDispositionsTables</Role>
      <ShortName>Acquisitions and Dispositions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/AcquisitionsandDispositions</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9954474 - Disclosure - Changes in Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/ChangesinEquityTables</Role>
      <ShortName>Changes in Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/ChangesinEquity</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9954475 - Disclosure - Derivative and Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/DerivativeandFinancialInstrumentsTables</Role>
      <ShortName>Derivative and Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/DerivativeandFinancialInstruments</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9954476 - Disclosure - Fair Value Measurement (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/FairValueMeasurementTables</Role>
      <ShortName>Fair Value Measurement (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/FairValueMeasurement</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9954477 - Disclosure - Accumulated Other Comprehensive Loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/AccumulatedOtherComprehensiveLossTables</Role>
      <ShortName>Accumulated Other Comprehensive Loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/AccumulatedOtherComprehensiveLoss</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9954478 - Disclosure - Cash Flow Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/CashFlowInformationTables</Role>
      <ShortName>Cash Flow Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/CashFlowInformation</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9954479 - Disclosure - Employee Benefit Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/EmployeeBenefitPlansTables</Role>
      <ShortName>Employee Benefit Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/EmployeeBenefitPlans</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9954480 - Disclosure - Related Party Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/RelatedPartyTransactionsTables</Role>
      <ShortName>Related Party Transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/RelatedPartyTransactions</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9954481 - Disclosure - Sales and Other Operating Revenues (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SalesandOtherOperatingRevenuesTables</Role>
      <ShortName>Sales and Other Operating Revenues (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/SalesandOtherOperatingRevenues</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9954482 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/EarningsPerShare</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9954483 - Disclosure - Segment Disclosures and Related Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SegmentDisclosuresandRelatedInformationTables</Role>
      <ShortName>Segment Disclosures and Related Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/SegmentDisclosuresandRelatedInformation</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9954484 - Disclosure - Inventories - Schedule of Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/InventoriesScheduleofInventoriesDetails</Role>
      <ShortName>Inventories - Schedule of Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9954485 - Disclosure - Acquisitions and Dispositions - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/AcquisitionsandDispositionsNarrativeDetails</Role>
      <ShortName>Acquisitions and Dispositions - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9954486 - Disclosure - Acquisitions and Dispositions - Schedule of Business Acquisition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/AcquisitionsandDispositionsScheduleofBusinessAcquisitionDetails</Role>
      <ShortName>Acquisitions and Dispositions - Schedule of Business Acquisition (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9954487 - Disclosure - Investments and Long-Term Receivables - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/InvestmentsandLongTermReceivablesNarrativeDetails</Role>
      <ShortName>Investments and Long-Term Receivables - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9954488 - Disclosure - Investment in Cenovus Energy - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/InvestmentinCenovusEnergyNarrativeDetails</Role>
      <ShortName>Investment in Cenovus Energy - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9954489 - Disclosure - Debt - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/DebtNarrativeDetails</Role>
      <ShortName>Debt - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9954490 - Disclosure - Changes in Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/ChangesinEquityDetails</Role>
      <ShortName>Changes in Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/ChangesinEquityTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9954491 - Disclosure - Guarantees - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/GuaranteesNarrativeDetails</Role>
      <ShortName>Guarantees - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9954492 - Disclosure - Contingencies and Commitments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/ContingenciesandCommitmentsNarrativeDetails</Role>
      <ShortName>Contingencies and Commitments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9954493 - Disclosure - Derivative and Financial Instruments - Schedule of Balance Sheet Location and Fair Value Amounts of Derivatives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/DerivativeandFinancialInstrumentsScheduleofBalanceSheetLocationandFairValueAmountsofDerivativesDetails</Role>
      <ShortName>Derivative and Financial Instruments - Schedule of Balance Sheet Location and Fair Value Amounts of Derivatives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9954494 - Disclosure - Derivative and Financial Instruments - Schedule of Income Statement Location and Gain (Loss) Amounts of Derivatives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/DerivativeandFinancialInstrumentsScheduleofIncomeStatementLocationandGainLossAmountsofDerivativesDetails</Role>
      <ShortName>Derivative and Financial Instruments - Schedule of Income Statement Location and Gain (Loss) Amounts of Derivatives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9954495 - Disclosure - Derivative and Financial Instruments - Schedule of Net Exposures from Outstanding Commodity Derivative Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/DerivativeandFinancialInstrumentsScheduleofNetExposuresfromOutstandingCommodityDerivativeContractsDetails</Role>
      <ShortName>Derivative and Financial Instruments - Schedule of Net Exposures from Outstanding Commodity Derivative Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9954496 - Disclosure - Derivative and Financial Instruments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/DerivativeandFinancialInstrumentsNarrativeDetails</Role>
      <ShortName>Derivative and Financial Instruments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9954497 - Disclosure - Derivative and Financial Instruments - Schedule of Net Carrying Amount of Held to Maturity Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/DerivativeandFinancialInstrumentsScheduleofNetCarryingAmountofHeldtoMaturityInvestmentsDetails</Role>
      <ShortName>Derivative and Financial Instruments - Schedule of Net Carrying Amount of Held to Maturity Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9954498 - Disclosure - Derivative and Financial Instruments - Schedule of Debt Securities Carried at Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/DerivativeandFinancialInstrumentsScheduleofDebtSecuritiesCarriedatFairValueDetails</Role>
      <ShortName>Derivative and Financial Instruments - Schedule of Debt Securities Carried at Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9954499 - Disclosure - Derivative and Financial Instruments - Schedule of Amortized Cost Basis and Fair Value of Investments in Debt Securities Classified as Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/DerivativeandFinancialInstrumentsScheduleofAmortizedCostBasisandFairValueofInvestmentsinDebtSecuritiesClassifiedasAvailableforSaleDetails</Role>
      <ShortName>Derivative and Financial Instruments - Schedule of Amortized Cost Basis and Fair Value of Investments in Debt Securities Classified as Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9954500 - Disclosure - Fair Value Measurement - Schedule of Fair Value Hierarchy for Gross Financial Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/FairValueMeasurementScheduleofFairValueHierarchyforGrossFinancialAssetsandLiabilitiesDetails</Role>
      <ShortName>Fair Value Measurement - Schedule of Fair Value Hierarchy for Gross Financial Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9954501 - Disclosure - Fair Value Measurement - Schedule of Commodity Derivative Balances Subject to Right of Setoff (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/FairValueMeasurementScheduleofCommodityDerivativeBalancesSubjecttoRightofSetoffDetails</Role>
      <ShortName>Fair Value Measurement - Schedule of Commodity Derivative Balances Subject to Right of Setoff (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9954502 - Disclosure - Fair Value Measurement - Schedule of Net Fair Value of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/FairValueMeasurementScheduleofNetFairValueofFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value Measurement - Schedule of Net Fair Value of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9954503 - Disclosure - Suspended Wells (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SuspendedWellsDetails</Role>
      <ShortName>Suspended Wells (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/SuspendedWells</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9954504 - Disclosure - Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Loss in the Equity Section of the Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/AccumulatedOtherComprehensiveLossScheduleofComponentsofAccumulatedOtherComprehensiveLossintheEquitySectionoftheBalanceSheetDetails</Role>
      <ShortName>Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Loss in the Equity Section of the Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9954505 - Disclosure - Accumulated Other Comprehensive Loss - Schedule of Items Reclassified out of Accumulated Other Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/AccumulatedOtherComprehensiveLossScheduleofItemsReclassifiedoutofAccumulatedOtherComprehensiveLossDetails</Role>
      <ShortName>Accumulated Other Comprehensive Loss - Schedule of Items Reclassified out of Accumulated Other Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9954506 - Disclosure - Cash Flow Information - Schedule of Cash Flow Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/CashFlowInformationScheduleofCashFlowInformationDetails</Role>
      <ShortName>Cash Flow Information - Schedule of Cash Flow Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9954507 - Disclosure - Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/EmployeeBenefitPlansScheduleofComponentsofNetPeriodicBenefitCostDetails</Role>
      <ShortName>Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9954508 - Disclosure - Employee Benefit Plans - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/EmployeeBenefitPlansNarrativeDetails</Role>
      <ShortName>Employee Benefit Plans - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9954509 - Disclosure - Related Party Transactions - Schedule of Significant Transactions with Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/RelatedPartyTransactionsScheduleofSignificantTransactionswithRelatedPartiesDetails</Role>
      <ShortName>Related Party Transactions - Schedule of Significant Transactions with Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9954510 - Disclosure - Sales and Other Operating Revenues - Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SalesandOtherOperatingRevenuesRevenueDetails</Role>
      <ShortName>Sales and Other Operating Revenues - Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9954511 - Disclosure - Sales and Other Operating Revenues - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SalesandOtherOperatingRevenuesNarrativeDetails</Role>
      <ShortName>Sales and Other Operating Revenues - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9954512 - Disclosure - Earnings Per Share - Earnings Per Share, Basic and Diluted (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/EarningsPerShareEarningsPerShareBasicandDilutedDetails</Role>
      <ShortName>Earnings Per Share - Earnings Per Share, Basic and Diluted (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9954513 - Disclosure - Segment Disclosures and Related Information - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SegmentDisclosuresandRelatedInformationNarrativeDetails</Role>
      <ShortName>Segment Disclosures and Related Information - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9954514 - Disclosure - Segment Disclosures and Related Information - Sales (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SegmentDisclosuresandRelatedInformationSalesDetails</Role>
      <ShortName>Segment Disclosures and Related Information - Sales (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/SegmentDisclosuresandRelatedInformationTables</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9954515 - Disclosure - Segment Disclosures and Related Information - Net Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SegmentDisclosuresandRelatedInformationNetIncomeLossDetails</Role>
      <ShortName>Segment Disclosures and Related Information - Net Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9954516 - Disclosure - Segment Disclosures and Related Information - Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/SegmentDisclosuresandRelatedInformationAssetsDetails</Role>
      <ShortName>Segment Disclosures and Related Information - Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/SegmentDisclosuresandRelatedInformationTables</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="cop-20230930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9954517 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.conocophillips.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.conocophillips.com/role/IncomeTaxes</ParentRole>
      <Position>76</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="cop-20230930.htm">cop-20230930.htm</File>
    <File>cop-20230930.xsd</File>
    <File>cop-20230930_cal.xml</File>
    <File>cop-20230930_def.xml</File>
    <File>cop-20230930_lab.xml</File>
    <File>cop-20230930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>cop-20230930_g1.jpg</File>
    <File>cop-20230930_g2.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1132">http://fasb.org/us-gaap/2023</BaseTaxonomy>
    <BaseTaxonomy items="32">http://xbrl.sec.gov/dei/2023</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2023</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
