<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Version>2.3.0.15</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ReportType />
  <ContextCount>382</ContextCount>
  <ElementCount>414</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>68</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>true</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0110 - Statement - Consolidated Statements of Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/ConsolidatedIncomeStatement</Role>
      <ShortName>Consolidated Statements of Income (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0120 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0130 - Statement - Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0131 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0140 - Statement - Consolidated Statements of Changes in Equity and Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/ConsolidatedStatementsOfChangesInEquityAndComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Changes in Equity and Comprehensive Income (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0141 - Statement - Consolidated Statements of Changes in Equity and Comprehensive Income (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/ConsolidatedStatementsOfChangesInEquityAndComprehensiveIncomeParenthetical</Role>
      <ShortName>Consolidated Statements of Changes in Equity and Comprehensive Income (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0150 - Statement - Consolidated Income Statements (ENTERGY ARKANSAS, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/IncomeStatementsSubsidiary1</Role>
      <ShortName>Consolidated Income Statements (ENTERGY ARKANSAS, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0151 - Statement - Consolidated Statements of Cash Flows (ENTERGY ARKANSAS, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfCashFlowsSubsidiaries1</Role>
      <ShortName>Consolidated Statements of Cash Flows (ENTERGY ARKANSAS, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0152 - Statement - Consolidated Balance Sheets (ENTERGY ARKANSAS, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsSubsidiaries1</Role>
      <ShortName>Consolidated Balance Sheets (ENTERGY ARKANSAS, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>01521 - Statement - Consolidated Balance Sheets (ENTERGY ARKANSAS, INC.) (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsParentheticalSubsidiaries1</Role>
      <ShortName>Consolidated Balance Sheets (ENTERGY ARKANSAS, INC.) (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0153 - Statement - Consolidated Statements of Changes in Common Equity (ENTERGY ARKANSAS, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfChangesInCommonEquitySubsidiaries1</Role>
      <ShortName>Consolidated Statements of Changes in Common Equity (ENTERGY ARKANSAS, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0154 - Statement - Income Statements (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/IncomeStatementSubsidiary2</Role>
      <ShortName>Income Statements (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0155 - Statement - Statements of Cash Flows (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfCashFlowsSubsidiary2</Role>
      <ShortName>Statements of Cash Flows (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0156 - Statement - Balance Sheets (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsSubsidiary2</Role>
      <ShortName>Balance Sheets (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0157 - Statement - Statements of Changes in Equity and Comprehensive Income (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfChangesInEquityAndComprehensiveIncomeSubsidiary2</Role>
      <ShortName>Statements of Changes in Equity and Comprehensive Income (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>01571 - Statement - Statements of Changes in Equity and Comprehensive Income (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfChangesInEquityAndComprehensiveIncomeParentheticalSubsidiary2</Role>
      <ShortName>Statements of Changes in Equity and Comprehensive Income (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0158 - Statement - Income Statements (ENTERGY LOUISIANA, LLC) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/IncomeStatementsSubsidiary3</Role>
      <ShortName>Income Statements (ENTERGY LOUISIANA, LLC) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0159 - Statement - Statements of Cash Flows (ENTERGY LOUISIANA, LLC) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfCashFlowsSubsidiary3</Role>
      <ShortName>Statements of Cash Flows (ENTERGY LOUISIANA, LLC) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>0160 - Statement - Balance Sheets (ENTERGY LOUISIANA, LLC) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsSubsidiary3</Role>
      <ShortName>Balance Sheets (ENTERGY LOUISIANA, LLC) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>01601 - Statement - Balance Sheets (ENTERGY LOUISIANA, LLC) (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsParentheticalSubsidiaries3</Role>
      <ShortName>Balance Sheets (ENTERGY LOUISIANA, LLC) (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>0161 - Statement - Statements of Changes in Equity and Comprehensive Income (ENTERGY LOUISIANA, LLC) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfChangesInEquityAndComprehensiveIncome</Role>
      <ShortName>Statements of Changes in Equity and Comprehensive Income (ENTERGY LOUISIANA, LLC) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>01611 - Statement - Statements of Changes in Equity and Comprehensive Income (ENTERGY LOUISIANA, LLC) (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfChangesInEquityAndComprehensiveIncomeParentheticalSubsidiary3</Role>
      <ShortName>Statements of Changes in Equity and Comprehensive Income (ENTERGY LOUISIANA, LLC) (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>0162 - Statement - Income Statements (ENTERGY MISSISSIPPI, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/IncomeStatementsSubsidiary4</Role>
      <ShortName>Income Statements (ENTERGY MISSISSIPPI, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>0163 - Statement - Statements of Cash Flows (ENTERGY MISSISSIPPI, INC) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfCashFlowsSubsidiary4</Role>
      <ShortName>Statements of Cash Flows (ENTERGY MISSISSIPPI, INC) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>0164 - Statement - Balance Sheets (ENTERGY MISSISSIPPI, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsSubsidiary4</Role>
      <ShortName>Balance Sheets (ENTERGY MISSISSIPPI, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>01641 - Statement - Balance Sheets (ENTERGY MISSISSIPPI, INC.) (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsParentheticalSubsidiaryFour</Role>
      <ShortName>Balance Sheets (ENTERGY MISSISSIPPI, INC.) (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>0165 - Statement - Statements of Changes in Common Equity (ENTERGY MISSISSIPPI, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfChangesInCommonEquitySubsidiaryFour</Role>
      <ShortName>Statements of Changes in Common Equity (ENTERGY MISSISSIPPI, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>0166 - Statement - Income Statements (ENTERGY NEW ORLEANS, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/IncomeStatementsSubsidiaryFive</Role>
      <ShortName>Income Statements (ENTERGY NEW ORLEANS, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>0167 - Statement - Statements of Cash Flows (ENTERGY NEW ORLEANS, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfCashFlowsSubsidiaryFive</Role>
      <ShortName>Statements of Cash Flows (ENTERGY NEW ORLEANS, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>0168 - Statement - Balance Sheets (ENTERGY NEW ORLEANS, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsSubsidiaryFive</Role>
      <ShortName>Balance Sheets (ENTERGY NEW ORLEANS, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>01681 - Statement - Balance Sheets (ENTERGY NEW ORLEANS, INC.) (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsParentheticalSubsidiaryFive</Role>
      <ShortName>Balance Sheets (ENTERGY NEW ORLEANS, INC.) (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>0169 - Statement - Statements of Changes in Common Equity (ENTERGY NEW ORLEANS, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfChangesInCommonEquitySubsidiaryFive</Role>
      <ShortName>Statements of Changes in Common Equity (ENTERGY NEW ORLEANS, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>0170 - Statement - Consolidated Income Statements (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/IncomeStatementsSubsidiarySix</Role>
      <ShortName>Consolidated Income Statements (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>0171 - Statement - Consolidated Statements of Cash Flows (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfCashFlowsSubsidiarySix</Role>
      <ShortName>Consolidated Statements of Cash Flows (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>0172 - Statement - Consolidated Balance Sheets (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsSubsidiarySix</Role>
      <ShortName>Consolidated Balance Sheets (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>01721 - Statement - Consolidated Balance Sheets (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsParentheticalSubsidiarySix</Role>
      <ShortName>Consolidated Balance Sheets (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>0173 - Statement - Consolidated Statements of Changes in Common Equity (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfChangesInCommonEquitySubsidiary6</Role>
      <ShortName>Consolidated Statements of Changes in Common Equity (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>0174 - Statement - Income Statements (SYSTEM ENERGY RESOURCES, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/IncomeStatementsSubsidiarySeven</Role>
      <ShortName>Income Statements (SYSTEM ENERGY RESOURCES, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>0175 - Statement - Statements of Cash Flows (SYSTEM ENERGY RESOURCES, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfCashFlowsSubsidiary7</Role>
      <ShortName>Statements of Cash Flows (SYSTEM ENERGY RESOURCES, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>0176 - Statement - Balance Sheets (SYSTEM ENERGY RESOURCES, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsSubsidiary7</Role>
      <ShortName>Balance Sheets (SYSTEM ENERGY RESOURCES, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>01761 - Statement - Balance Sheets (SYSTEM ENERGY RESOURCES, INC.) (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BalanceSheetsParentheticalSubsidiarySeven</Role>
      <ShortName>Balance Sheets (SYSTEM ENERGY RESOURCES, INC.) (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>0177 - Statement - Statements of Changes in Common Equity SYSTEM ENERGY RESOURCES, INC.) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StatementsOfChangesInCommonEquitySubsidiarySeven</Role>
      <ShortName>Statements of Changes in Common Equity SYSTEM ENERGY RESOURCES, INC.) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>0201 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>0202 - Disclosure - Rate and Regulatory Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RateAndRegulatoryMatters</Role>
      <ShortName>Rate and Regulatory Matters</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>0203 - Disclosure - Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/CommonEquity</Role>
      <ShortName>Equity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>0204 - Disclosure - Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RevolvingCreditFacilitiesLinesOfCreditShortTermBorrowingsAndLongTermDebt</Role>
      <ShortName>Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>0205 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StockBasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>0206 - Disclosure - Retirement and Other Postretirement Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RetirementOtherPostretirementBenefitsAndDefinedContributionPlans</Role>
      <ShortName>Retirement and Other Postretirement Benefits</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>0207 - Disclosure - Business Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BusinessSegmentInformation</Role>
      <ShortName>Business Segment Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>0208 - Disclosure - Risk Management and Fair Values</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RiskManagementAndFairValues</Role>
      <ShortName>Risk Management and Fair Values</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>0209 - Disclosure - Decommissioning Trust Funds</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/DecommissioningTrustFunds</Role>
      <ShortName>Decommissioning Trust Funds</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>0210 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>0211 - Disclosure - Property, Plant, and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/PropertyPlantAndEquipment</Role>
      <ShortName>Property, Plant, and Equipment</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>0212 - Disclosure - Variable Interest Entities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/VariableInterestEntities</Role>
      <ShortName>Variable Interest Entities</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>0502 - Disclosure - Rate and Regulatory Matters (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RateAndRegulatoryMattersTables</Role>
      <ShortName>Rate and Regulatory Matters (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>0503 - Disclosure - Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/EquityTables</Role>
      <ShortName>Equity (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>0504 - Disclosure - Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RevolvingCreditFacilitiesLinesOfCreditShortTermBorrowingsAndLongTermDebtTables</Role>
      <ShortName>Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>0505 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StockBasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>0506 - Disclosure - Retirement and Other Postretirement Benefits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RetirementAndOtherPostretirementBenefitsTables</Role>
      <ShortName>Retirement and Other Postretirement Benefits (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>0507 - Disclosure - Business Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BusinessSegmentInformationTables</Role>
      <ShortName>Business Segment Information (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>0508 - Disclosure - Risk Management and Fair Values (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RiskManagementAndFairValuesTables</Role>
      <ShortName>Risk Management and Fair Values (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>0509 - Disclosure - Decommissioning Trust Funds (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/DecommissioningTrustFundsEntergyCorporationEntergyArkansasEntergyGulfStatesLouisianaEntergyLouisianaAndSystemEnergyTables</Role>
      <ShortName>Decommissioning Trust Funds (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>0602 - Disclosure - Rate and Regulatory Matters (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RateAndRegulatoryMattersDetails</Role>
      <ShortName>Rate and Regulatory Matters (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>06021 - Disclosure - Rate and Regulatory Matters (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RateAndRegulatoryMattersDetailsTextuals</Role>
      <ShortName>Rate and Regulatory Matters (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>0603 - Disclosure - Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/EquityDetails</Role>
      <ShortName>Equity (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>06031 - Disclosure - Equity (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/EquityDetails1</Role>
      <ShortName>Equity (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>0604 - Disclosure - Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/LinesOfCreditRelatedShortTermBorrowingsAndLongTermDebtDetails</Role>
      <ShortName>Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>06041 - Disclosure - Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RevolvingCreditFacilitiesLinesOfCreditAndShortTermBorrowingsDetails1</Role>
      <ShortName>Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>06042 - Disclosure - Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RevolvingCreditFacilitiesLinesOfCreditAndShortTermBorrowingsDetails2</Role>
      <ShortName>Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>06043 - Disclosure - Revolving Credit Facilities, Lines of Credit and Short Term Borrowings and Long Term Debt (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RevolvingCreditFacilitiesLinesOfCreditAndShortTermBorrowingsAndLongTermDebtDetailsTextuals</Role>
      <ShortName>Revolving Credit Facilities, Lines of Credit and Short Term Borrowings and Long Term Debt (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>0605 - Disclosure - Stock-Based Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StockBasedCompensationDetails</Role>
      <ShortName>Stock-Based Compensation (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>06051 - Disclosure - Stock Based Compensation (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StockBasedCompensationDetails5</Role>
      <ShortName>Stock Based Compensation (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>06052 - Disclosure - Stock Based Compensation (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/StockBasedCompensationDetailsTextuals</Role>
      <ShortName>Stock Based Compensation (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>0606 - Disclosure - Retirement and Other Postretirement Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RetirementAndOtherPostretirementBenefitsDetails</Role>
      <ShortName>Retirement and Other Postretirement Benefits (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>06061 - Disclosure - Retirement and Other Postretirement Benefits (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RetirementAndOtherPostretirementBenefitsDetailsTextuals</Role>
      <ShortName>Retirement and Other Postretirement Benefits (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>0607 - Disclosure - Business Segment Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/BusinessSegmentInformationDetails</Role>
      <ShortName>Business Segment Information (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>0608 - Disclosure - Risk Management and Fair Values (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RiskManagementAndFairValuesDetails</Role>
      <ShortName>Risk Management and Fair Values (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>06081 - Disclosure - Risk Management and Fair Values (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RiskManagementAndFairValuesDetails1</Role>
      <ShortName>Risk Management and Fair Values (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>06082 - Disclosure - Risk Management and Fair Values (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RiskManagementAndFairValuesDetails2</Role>
      <ShortName>Risk Management and Fair Values (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>06083 - Disclosure - Risk Management and Fair Values (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RiskManagementAndFairValuesDetails3</Role>
      <ShortName>Risk Management and Fair Values (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>06084 - Disclosure - Risk Management and Fair Values (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/RiskManagementAndFairValuesDetailsTextuals</Role>
      <ShortName>Risk Management and Fair Values (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>0609 - Disclosure - Decommissioning Trust Funds (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/DecommissioningTrustFundsEntergyCorporationEntergyArkansasEntergyGulfStatesLouisianaEntergyLouisianaAndSystemEnergyDetails</Role>
      <ShortName>Decommissioning Trust Funds (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>06091 - Disclosure - Decommissioning Trust Funds (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/DecommissioningTrustFundsDetails1</Role>
      <ShortName>Decommissioning Trust Funds (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>0610 - Disclosure - Income Taxes (Details Textuals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/IncomeTaxesDetailsTextuals</Role>
      <ShortName>Income Taxes (Details Textuals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>0611 - Disclosure - Property, Plant, and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/PropertyPlantAndEquipmentDetails</Role>
      <ShortName>Property, Plant, and Equipment (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>0612 - Disclosure - Variable Interest Entities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://entergy.com/role/VariableInterestEntitiesDetails</Role>
      <ShortName>Variable Interest Entities (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Element etr_RevenueDeficiencyAdjusted had a mix of decimals attribute values: -3 -5.</Log>
    <Log type="Info">Element us-gaap_LineOfCreditFacilityAmountOutstanding had a mix of decimals attribute values: -5 -6.</Log>
    <Log type="Info">Element us-gaap_LineOfCreditFacilityAmountOutstanding had a mix of decimals attribute values: -5 -6.</Log>
    <Log type="Info">Element etr_WeightedAverageInterestRateOnBorrowings had a mix of decimals attribute values: 5 4.</Log>
    <Log type="Info">Element us-gaap_LineOfCreditFacilityAmountOutstanding had a mix of decimals attribute values: -5 -6.</Log>
    <Log type="Info">Element us-gaap_LineOfCreditFacilityAmountOutstanding had a mix of decimals attribute values: -5 -6.</Log>
    <Log type="Info">Element us-gaap_AvailableForSaleSecurities had a mix of decimals attribute values: -5 -6.</Log>
    <Log type="Info">Element us-gaap_AvailableForSaleSecurities had a mix of decimals attribute values: -5 -6.</Log>
    <Log type="Info">'Monetary' elements on report '0141 - Statement - Consolidated Statements of Changes in Equity and Comprehensive Income (Unaudited) (Parenthetical)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06021 - Disclosure - Rate and Regulatory Matters (Details Textuals)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0603 - Disclosure - Equity (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0604 - Disclosure - Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06042 - Disclosure - Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt (Details 2)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06043 - Disclosure - Revolving Credit Facilities, Lines of Credit and Short Term Borrowings and Long Term Debt (Details Textuals)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06091 - Disclosure - Decommissioning Trust Funds (Details 1)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0610 - Disclosure - Income Taxes (Details Textuals)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 0110 - Statement - Consolidated Statements of Income (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column '1 Months Ended
Oct. 28, 2011'</Log>
    <Log type="Info">Process Flow-Through: 0120 - Statement - Consolidated Statements of Cash Flows (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0130 - Statement - Consolidated Balance Sheets (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">Process Flow-Through: 0131 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 0141 - Statement - Consolidated Statements of Changes in Equity and Comprehensive Income (Unaudited) (Parenthetical)</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2010'</Log>
    <Log type="Info">Process Flow-Through: 0150 - Statement - Consolidated Income Statements (ENTERGY ARKANSAS, INC.) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0151 - Statement - Consolidated Statements of Cash Flows (ENTERGY ARKANSAS, INC.) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0152 - Statement - Consolidated Balance Sheets (ENTERGY ARKANSAS, INC.) (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">Process Flow-Through: 01521 - Statement - Consolidated Balance Sheets (ENTERGY ARKANSAS, INC.) (Unaudited) (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 0154 - Statement - Income Statements (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0155 - Statement - Statements of Cash Flows (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0156 - Statement - Balance Sheets (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">Process Flow-Through: 01571 - Statement - Statements of Changes in Equity and Comprehensive Income (ENTERGY GULF STATES LOUISIANA, L.L.C.) (Unaudited) (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 0158 - Statement - Income Statements (ENTERGY LOUISIANA, LLC) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0159 - Statement - Statements of Cash Flows (ENTERGY LOUISIANA, LLC) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0160 - Statement - Balance Sheets (ENTERGY LOUISIANA, LLC) (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">Process Flow-Through: 01601 - Statement - Balance Sheets (ENTERGY LOUISIANA, LLC) (Unaudited) (Parenthetical)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2010'</Log>
    <Log type="Info">Process Flow-Through: 01611 - Statement - Statements of Changes in Equity and Comprehensive Income (ENTERGY LOUISIANA, LLC) (Unaudited) (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 0162 - Statement - Income Statements (ENTERGY MISSISSIPPI, INC.) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0163 - Statement - Statements of Cash Flows (ENTERGY MISSISSIPPI, INC) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0164 - Statement - Balance Sheets (ENTERGY MISSISSIPPI, INC.) (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">Process Flow-Through: 01641 - Statement - Balance Sheets (ENTERGY MISSISSIPPI, INC.) (Unaudited) (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 0166 - Statement - Income Statements (ENTERGY NEW ORLEANS, INC.) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0167 - Statement - Statements of Cash Flows (ENTERGY NEW ORLEANS, INC.) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0168 - Statement - Balance Sheets (ENTERGY NEW ORLEANS, INC.) (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">Process Flow-Through: 01681 - Statement - Balance Sheets (ENTERGY NEW ORLEANS, INC.) (Unaudited) (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 0170 - Statement - Consolidated Income Statements (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0171 - Statement - Consolidated Statements of Cash Flows (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0172 - Statement - Consolidated Balance Sheets (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">Process Flow-Through: 01721 - Statement - Consolidated Balance Sheets (ENTERGY TEXAS, INC. AND SUBSIDIARIES) (Unaudited) (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 0174 - Statement - Income Statements (SYSTEM ENERGY RESOURCES, INC.) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0175 - Statement - Statements of Cash Flows (SYSTEM ENERGY RESOURCES, INC.) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0176 - Statement - Balance Sheets (SYSTEM ENERGY RESOURCES, INC.) (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">Process Flow-Through: 01761 - Statement - Balance Sheets (SYSTEM ENERGY RESOURCES, INC.) (Unaudited) (Parenthetical)</Log>
  </Logs>
  <InputFiles>
    <File>etr-20110930.xml</File>
    <File>etr-20110930.xsd</File>
    <File>etr-20110930_cal.xml</File>
    <File>etr-20110930_def.xml</File>
    <File>etr-20110930_lab.xml</File>
    <File>etr-20110930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
