<?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/20260828">
    <link:schemaRef xlink:href="xom-20260828.xsd" xlink:type="simple"/>
    <context id="duration_2026-08-28_to_2026-08-28">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002115436</identifier>
        </entity>
        <period>
            <startDate>2026-08-28</startDate>
            <endDate>2026-08-28</endDate>
        </period>
    </context>
    <context id="duration_2026-08-28_to_2026-08-28_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>2026-08-28</startDate>
            <endDate>2026-08-28</endDate>
        </period>
    </context>
    <context id="duration_2026-08-28_to_2026-08-28_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>2026-08-28</startDate>
            <endDate>2026-08-28</endDate>
        </period>
    </context>
    <context id="duration_2026-08-28_to_2026-08-28_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>2026-08-28</startDate>
            <endDate>2026-08-28</endDate>
        </period>
    </context>
    <context id="duration_2026-08-28_to_2026-08-28_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>2026-08-28</startDate>
            <endDate>2026-08-28</endDate>
        </period>
    </context>
    <dei:EntityRegistrantName
      contextRef="duration_2026-08-28_to_2026-08-28"
      id="Hidden_dei_EntityRegistrantName">ExxonMobil Holdings Corp</dei:EntityRegistrantName>
    <dei:AmendmentFlag contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-307">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="duration_2026-08-28_to_2026-08-28"
      id="Hidden_dei_EntityCentralIndexKey">0002115436</dei:EntityCentralIndexKey>
    <dei:DocumentType contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-350">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-351">2026-08-28</dei:DocumentPeriodEndDate>
    <dei:EntityIncorporationStateCountryCode contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-352">TX</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-353">1-43384</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-354">41-4104094</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1 contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-355">22777 Springwoods Village Parkway</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-356">Spring</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-357">TX</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-358">77389-1425</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-359">(972)</dei:CityAreaCode>
    <dei:LocalPhoneNumber contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-360">940-6000</dei:LocalPhoneNumber>
    <dei:WrittenCommunications contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-361">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-362">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-363">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-364">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="ixv-365">Common Stock, par value $0.001 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="ixv-366">XOM</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="ixv-367">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2028Member"
      id="ixv-368">0.524% Notes due 2028</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2028Member"
      id="ixv-369">XOM28</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2028Member"
      id="ixv-370">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2032Member"
      id="ixv-371">0.835% Notes due 2032</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2032Member"
      id="ixv-372">XOM32</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_xom-ZeroPointFiveTwoFourPercentNotesDue2032Member"
      id="ixv-373">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_xom-OnePointFourZeroEightPercentNotesDue2039Member"
      id="ixv-374">1.408% Notes due 2039</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_xom-OnePointFourZeroEightPercentNotesDue2039Member"
      id="ixv-375">XOM39A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-08-28_to_2026-08-28_us-gaap-StatementClassOfStockAxis_xom-OnePointFourZeroEightPercentNotesDue2039Member"
      id="ixv-376">NYSE</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany contextRef="duration_2026-08-28_to_2026-08-28" id="ixv-377">false</dei:EntityEmergingGrowthCompany>
</xbrl>
