<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:us-gaap="http://fasb.org/us-gaap/2025"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:xom="http://www.exxonmobil.com/20260925">
    <link:schemaRef xlink:href="xom-20260925.xsd" xlink:type="simple"/>
    <context id="duration_2026-09-25_to_2026-09-25">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002115436</identifier>
        </entity>
        <period>
            <startDate>2026-09-25</startDate>
            <endDate>2026-09-25</endDate>
        </period>
    </context>
    <context id="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002115436</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:CommonStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-09-25</startDate>
            <endDate>2026-09-25</endDate>
        </period>
    </context>
    <context id="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2028Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002115436</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">xom:ZeroPointFiveTwoFourPercentNotesDue2028Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-09-25</startDate>
            <endDate>2026-09-25</endDate>
        </period>
    </context>
    <context id="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2032Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002115436</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">xom:ZeroPointFiveTwoFourPercentNotesDue2032Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-09-25</startDate>
            <endDate>2026-09-25</endDate>
        </period>
    </context>
    <context id="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-OnePointFourZeroEightPercentNotesDue2039Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002115436</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">xom:OnePointFourZeroEightPercentNotesDue2039Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-09-25</startDate>
            <endDate>2026-09-25</endDate>
        </period>
    </context>
    <dei:EntityRegistrantName
      contextRef="duration_2026-09-25_to_2026-09-25"
      id="Hidden_dei_EntityRegistrantName">ExxonMobil Holdings Corp</dei:EntityRegistrantName>
    <dei:AmendmentFlag contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-412">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="duration_2026-09-25_to_2026-09-25"
      id="Hidden_dei_EntityCentralIndexKey">0002115436</dei:EntityCentralIndexKey>
    <dei:DocumentType contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-455">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-456">2026-09-25</dei:DocumentPeriodEndDate>
    <dei:EntityIncorporationStateCountryCode contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-457">TX</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-458">1-43384</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-459">41-4104094</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1 contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-460">22777 Springwoods</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2 contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-461">Village Parkway</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-462">Spring</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-463">TX</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-464">77389-1425</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-465">(972)</dei:CityAreaCode>
    <dei:LocalPhoneNumber contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-466">940-6000</dei:LocalPhoneNumber>
    <dei:WrittenCommunications contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-467">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-468">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-469">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-470">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="ixv-471">Common Stock, par value $0.001 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="ixv-472">XOM</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="ixv-473">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2028Member"
      id="ixv-474">0.524% Notes due 2028</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2028Member"
      id="ixv-475">XOM28</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2028Member"
      id="ixv-476">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2032Member"
      id="ixv-477">0.835% Notes due 2032</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2032Member"
      id="ixv-478">XOM32</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2032Member"
      id="ixv-479">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-OnePointFourZeroEightPercentNotesDue2039Member"
      id="ixv-480">1.408% Notes due 2039</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-OnePointFourZeroEightPercentNotesDue2039Member"
      id="ixv-481">XOM39A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-09-25_to_2026-09-25_us-gaap-StatementClassOfStockAxis_xom-OnePointFourZeroEightPercentNotesDue2039Member"
      id="ixv-482">NYSE</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany contextRef="duration_2026-09-25_to_2026-09-25" id="ixv-483">false</dei:EntityEmergingGrowthCompany>
</xbrl>
