<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.23.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>464</ContextCount>
  <ElementCount>337</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>77</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Statement - Consolidated Statements Of Earnings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/ConsolidatedStatementsOfEarnings</Role>
      <ShortName>Consolidated Statements Of Earnings</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0000003 - Statement - Consolidated Statements Of Earnings (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/ConsolidatedStatementsOfEarningsParenthetical</Role>
      <ShortName>Consolidated Statements Of Earnings (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0000004 - Statement - Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/ConsolidatedStatementsofComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0000005 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0000006 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0000007 - Statement - Consolidated Statement of Equity Statement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/ConsolidatedStatementofEquityStatement</Role>
      <ShortName>Consolidated Statement of Equity Statement</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0000008 - Statement - Consolidated Statement of Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/ConsolidatedStatementofEquityParenthetical</Role>
      <ShortName>Consolidated Statement of Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0000009 - Statement - Consolidated Statements Of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/ConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements Of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0000010 - Disclosure - Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/BasisofPresentation</Role>
      <ShortName>Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0000011 - Disclosure - Revenue Recognition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/RevenueRecognition</Role>
      <ShortName>Revenue Recognition</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0000012 - Disclosure - Common Shares and Share-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/CommonSharesandShareBasedCompensation</Role>
      <ShortName>Common Shares and Share-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0000013 - Disclosure - Acquisitions and Divestitures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/AcquisitionsandDivestitures</Role>
      <ShortName>Acquisitions and Divestitures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0000014 - Disclosure - Discontinued Operations and Disposal Groups</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/DiscontinuedOperationsandDisposalGroups</Role>
      <ShortName>Discontinued Operations and Disposal Groups</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0000015 - Disclosure - Pension &amp; Postretirement Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/PensionPostretirementPlans</Role>
      <ShortName>Pension &amp; Postretirement Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0000016 - Disclosure - Other Deductions, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherDeductionsNet</Role>
      <ShortName>Other Deductions, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0000017 - Disclosure - Restructuring Costs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/RestructuringCosts</Role>
      <ShortName>Restructuring Costs</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0000018 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0000019 - Disclosure - Equity Method Investment and Note Receivable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/EquityMethodInvestmentandNoteReceivable</Role>
      <ShortName>Equity Method Investment and Note Receivable</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>0000020 - Disclosure - Other Financial Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherFinancialInformation</Role>
      <ShortName>Other Financial Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>0000021 - Disclosure - Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/FinancialInstruments</Role>
      <ShortName>Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>0000022 - Disclosure - Accumulated Other Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/AccumulatedOtherComprehensiveIncomeLoss</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>0000023 - Disclosure - Business Segments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/BusinessSegments</Role>
      <ShortName>Business Segments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9954701 - Disclosure - Revenue Recognition (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/RevenueRecognitionTables</Role>
      <ShortName>Revenue Recognition (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/RevenueRecognition</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9954702 - Disclosure - Common Shares and Share-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/CommonSharesandShareBasedCompensationTables</Role>
      <ShortName>Common Shares and Share-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/CommonSharesandShareBasedCompensation</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9954703 - Disclosure - Acquisitions and Divestitures (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/AcquisitionsandDivestituresTables</Role>
      <ShortName>Acquisitions and Divestitures (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/AcquisitionsandDivestitures</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9954704 - Disclosure - Discontinued Operations and Disposal Groups (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/DiscontinuedOperationsandDisposalGroupsTables</Role>
      <ShortName>Discontinued Operations and Disposal Groups (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/DiscontinuedOperationsandDisposalGroups</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9954705 - Disclosure - Pension &amp; Postretirement Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/PensionPostretirementPlansTables</Role>
      <ShortName>Pension &amp; Postretirement Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/PensionPostretirementPlans</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9954706 - Disclosure - Other Deductions, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherDeductionsNetTables</Role>
      <ShortName>Other Deductions, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/OtherDeductionsNet</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9954707 - Disclosure - Restructuring Costs (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/RestructuringCostsTables</Role>
      <ShortName>Restructuring Costs (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/RestructuringCosts</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9954708 - Disclosure - Equity Method Investment and Note Receivable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/EquityMethodInvestmentandNoteReceivableTables</Role>
      <ShortName>Equity Method Investment and Note Receivable (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/EquityMethodInvestmentandNoteReceivable</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9954709 - Disclosure - Other Financial Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherFinancialInformationTables</Role>
      <ShortName>Other Financial Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/OtherFinancialInformation</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9954710 - Disclosure - Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/FinancialInstrumentsTables</Role>
      <ShortName>Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/FinancialInstruments</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9954711 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/AccumulatedOtherComprehensiveIncomeLossTables</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/AccumulatedOtherComprehensiveIncomeLoss</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9954712 - Disclosure - Business Segments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/BusinessSegmentsTables</Role>
      <ShortName>Business Segments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.emerson.com/role/BusinessSegments</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9954714 - Disclosure - Revenue Recognition Contract Assets (Liabilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/RevenueRecognitionContractAssetsLiabilitiesDetails</Role>
      <ShortName>Revenue Recognition Contract Assets (Liabilities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9954715 - Disclosure - Revenue Recognition Performance Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/RevenueRecognitionPerformanceObligationsDetails</Role>
      <ShortName>Revenue Recognition Performance Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9954716 - Disclosure - Common Shares and Share-Based Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/CommonSharesandShareBasedCompensationDetails</Role>
      <ShortName>Common Shares and Share-Based Compensation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/CommonSharesandShareBasedCompensationTables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9954717 - Disclosure - Purchase Price (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/PurchasePriceDetails</Role>
      <ShortName>Purchase Price (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9954718 - Disclosure - Acquisitions And Divestitures Schedule of Purchase Price Allocated to Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/AcquisitionsAndDivestituresScheduleofPurchasePriceAllocatedtoAssetsandLiabilitiesDetails</Role>
      <ShortName>Acquisitions And Divestitures Schedule of Purchase Price Allocated to Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9954719 - Disclosure - Finite &amp; Indefinite Lived Intangibles (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/FiniteIndefiniteLivedIntangiblesDetails</Role>
      <ShortName>Finite &amp; Indefinite Lived Intangibles (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9954720 - Disclosure - Pro Forma Financial Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/ProFormaFinancialInformationDetails</Role>
      <ShortName>Pro Forma Financial Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9954721 - Disclosure - Acquisitions and Divestitures Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/AcquisitionsandDivestituresNarrativeDetails</Role>
      <ShortName>Acquisitions and Divestitures Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9954722 - Disclosure - Discontinued Operations and Disposal Groups (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/DiscontinuedOperationsandDisposalGroupsDetails</Role>
      <ShortName>Discontinued Operations and Disposal Groups (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/DiscontinuedOperationsandDisposalGroupsTables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9954723 - Disclosure - Pension &amp; Postretirement Plans (Schedule Of Net Periodic Pension And Net Postretirement Plan Expenses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/PensionPostretirementPlansScheduleOfNetPeriodicPensionAndNetPostretirementPlanExpensesDetails</Role>
      <ShortName>Pension &amp; Postretirement Plans (Schedule Of Net Periodic Pension And Net Postretirement Plan Expenses) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/PensionPostretirementPlansTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9954724 - Disclosure - Other Deductions, Net (Schedule Of Other Deductions, Net) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherDeductionsNetScheduleOfOtherDeductionsNetDetails</Role>
      <ShortName>Other Deductions, Net (Schedule Of Other Deductions, Net) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/OtherDeductionsNetTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9954725 - Disclosure - Restructuring Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/RestructuringCostsDetails</Role>
      <ShortName>Restructuring Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/RestructuringCostsTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9954726 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/IncomeTaxes</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9954727 - Disclosure - Equity Method Investment and Note Receivable (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/EquityMethodInvestmentandNoteReceivableNarrativeDetails</Role>
      <ShortName>Equity Method Investment and Note Receivable (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/EquityMethodInvestmentandNoteReceivableTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9954728 - Disclosure - Equity Method Investment and Note Receivable - Summarized Financial Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/EquityMethodInvestmentandNoteReceivableSummarizedFinancialInformationDetails</Role>
      <ShortName>Equity Method Investment and Note Receivable - Summarized Financial Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9954729 - Disclosure - Other Financial Information (Inventories) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherFinancialInformationInventoriesDetails</Role>
      <ShortName>Other Financial Information (Inventories) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/OtherFinancialInformationTables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9954730 - Disclosure - Other Financial Information (PPE) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherFinancialInformationPPEDetails</Role>
      <ShortName>Other Financial Information (PPE) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/OtherFinancialInformationTables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9954731 - Disclosure - Other Financial Information (Goodwill) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherFinancialInformationGoodwillDetails</Role>
      <ShortName>Other Financial Information (Goodwill) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/OtherFinancialInformationTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9954732 - Disclosure - Other Financial Information (Intangibles) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherFinancialInformationIntangiblesDetails</Role>
      <ShortName>Other Financial Information (Intangibles) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/OtherFinancialInformationTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9954733 - Disclosure - Other Financial Data (Components of Depreciation and Amortization) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherFinancialDataComponentsofDepreciationandAmortizationDetails</Role>
      <ShortName>Other Financial Data (Components of Depreciation and Amortization) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/OtherFinancialInformationTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9954734 - Disclosure - Other Financial Information (Other Assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherFinancialInformationOtherAssetsDetails</Role>
      <ShortName>Other Financial Information (Other Assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/OtherFinancialInformationTables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9954735 - Disclosure - Other Financial Information (Accrued Expenses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherFinancialInformationAccruedExpensesDetails</Role>
      <ShortName>Other Financial Information (Accrued Expenses) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/OtherFinancialInformationTables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9954736 - Disclosure - Other Financial Information (Other Liabilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/OtherFinancialInformationOtherLiabilitiesDetails</Role>
      <ShortName>Other Financial Information (Other Liabilities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/OtherFinancialInformationTables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9954737 - Disclosure - Financial Instruments (Schedule Of Derivative Instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/FinancialInstrumentsScheduleOfDerivativeInstrumentsDetails</Role>
      <ShortName>Financial Instruments (Schedule Of Derivative Instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/FinancialInstrumentsTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9954738 - Disclosure - Financial Instruments (Fair Value Measurements) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/FinancialInstrumentsFairValueMeasurementsDetails</Role>
      <ShortName>Financial Instruments (Fair Value Measurements) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/FinancialInstrumentsTables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9954739 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/AccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/AccumulatedOtherComprehensiveIncomeLossTables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9954740 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/AccumulatedOtherComprehensiveIncomeLossDetails2</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) (Details 2)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/AccumulatedOtherComprehensiveIncomeLossTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9954741 - Disclosure - Business Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/BusinessSegmentsDetails</Role>
      <ShortName>Business Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.emerson.com/role/BusinessSegmentsTables</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9954742 - Disclosure - Business Segment Information - Depreciation &amp; Amortization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/BusinessSegmentInformationDepreciationAmortizationDetails</Role>
      <ShortName>Business Segment Information - Depreciation &amp; Amortization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="emr-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9954743 - Disclosure - Business Segments Geographic Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.emerson.com/role/BusinessSegmentsGeographicInformationDetails</Role>
      <ShortName>Business Segments Geographic Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Warning">[ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 10 fact(s) appearing in ix:hidden were eligible for transformation: dei:Security12bTitle, dei:SecurityExchangeName, dei:TradingSymbol, emr:PeriodOverWhichDistributionsAreExpectedToOccur, us-gaap:CommonStockParOrStatedValuePerShare, us-gaap:CommonStockSharesAuthorized, us-gaap:CommonStockSharesIssued, us-gaap:RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1 -  emr-20230630.htm 4</Log>
  </Logs>
  <InputFiles>
    <File doctype="10-Q" original="emr-20230630.htm">emr-20230630.htm</File>
    <File>emr-20230630.xsd</File>
    <File>emr-20230630_cal.xml</File>
    <File>emr-20230630_def.xml</File>
    <File>emr-20230630_lab.xml</File>
    <File>emr-20230630_pre.xml</File>
    <File>q3fy23exhibit31.htm</File>
    <File>q3fy23exhibit32.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>emr-20230630_g1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1296">http://fasb.org/us-gaap/2023</BaseTaxonomy>
    <BaseTaxonomy items="43">http://xbrl.sec.gov/dei/2023</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
