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Disclosure - REVOLVING CREDIT FACILITIES, LINES OF CREDIT, SHORT-TERM BORROWINGS, AND LONG-TERM DEBT (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Long-Term Debt Instruments) (Details) Sheet http://www.entergy.com/role/REVOLVINGCREDITFACILITIESLINESOFCREDITSHORTTERMBORROWINGSANDLONGTERMDEBTEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyScheduleofLongTermDebtInstrumentsDetails REVOLVING CREDIT FACILITIES, LINES OF CREDIT, SHORT-TERM BORROWINGS, AND LONG-TERM DEBT (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Long-Term Debt Instruments) (Details) Details http://www.entergy.com/role/REVOLVINGCREDITFACILITIESLINESOFCREDITSHORTTERMBORROWINGSANDLONGTERMDEBTEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 45 false false R46.htm 9955534 - 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Disclosure - RETIREMENT AND OTHER POSTRETIREMENT BENEFITS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Narrative) (Details) Sheet http://www.entergy.com/role/RETIREMENTANDOTHERPOSTRETIREMENTBENEFITSEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyNarrativeDetails RETIREMENT AND OTHER POSTRETIREMENT BENEFITS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Narrative) (Details) Details http://www.entergy.com/role/RETIREMENTANDOTHERPOSTRETIREMENTBENEFITSEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 49 false false R50.htm 9955538 - Disclosure - RETIREMENT AND OTHER POSTRETIREMENT BENEFITS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Reclassifications) (Details) Sheet http://www.entergy.com/role/RETIREMENTANDOTHERPOSTRETIREMENTBENEFITSEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyScheduleofReclassificationsDetails RETIREMENT AND OTHER POSTRETIREMENT BENEFITS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Reclassifications) (Details) Details http://www.entergy.com/role/RETIREMENTANDOTHERPOSTRETIREMENTBENEFITSEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 50 false false R51.htm 9955539 - Disclosure - RETIREMENT AND OTHER POSTRETIREMENT BENEFITS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Expected Benefit Payments) (Details) Sheet http://www.entergy.com/role/RETIREMENTANDOTHERPOSTRETIREMENTBENEFITSEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyScheduleofExpectedBenefitPaymentsDetails RETIREMENT AND OTHER POSTRETIREMENT BENEFITS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Expected Benefit Payments) (Details) Details http://www.entergy.com/role/RETIREMENTANDOTHERPOSTRETIREMENTBENEFITSEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 51 false false R52.htm 9955540 - Disclosure - BUSINESS SEGMENT INFORMATION (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Narrative) (Details) Sheet http://www.entergy.com/role/BUSINESSSEGMENTINFORMATIONEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyNarrativeDetails BUSINESS SEGMENT INFORMATION (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Narrative) (Details) Details http://www.entergy.com/role/BUSINESSSEGMENTINFORMATIONEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 52 false false R53.htm 9955541 - Disclosure - BUSINESS SEGMENT INFORMATION (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Summary of Significant Categories) (Details) Sheet http://www.entergy.com/role/BUSINESSSEGMENTINFORMATIONEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergySummaryofSignificantCategoriesDetails BUSINESS SEGMENT INFORMATION (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Summary of Significant Categories) (Details) Details http://www.entergy.com/role/BUSINESSSEGMENTINFORMATIONEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 53 false false R54.htm 9955542 - Disclosure - BUSINESS SEGMENT INFORMATION (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Summary of Segment Reporting) (Details) Sheet http://www.entergy.com/role/BUSINESSSEGMENTINFORMATIONEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergySummaryofSegmentReportingDetails BUSINESS SEGMENT INFORMATION (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Summary of Segment Reporting) (Details) Details http://www.entergy.com/role/BUSINESSSEGMENTINFORMATIONEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 54 false false R55.htm 9955543 - Disclosure - RISK MANAGEMENT AND FAIR VALUES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Narrative) (Details) Sheet http://www.entergy.com/role/RISKMANAGEMENTANDFAIRVALUESEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyNarrativeDetails RISK MANAGEMENT AND FAIR VALUES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Narrative) (Details) Details http://www.entergy.com/role/RISKMANAGEMENTANDFAIRVALUESEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 55 false false R56.htm 9955544 - Disclosure - RISK MANAGEMENT AND FAIR VALUES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Derivatives Instruments) (Details) Sheet http://www.entergy.com/role/RISKMANAGEMENTANDFAIRVALUESEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyScheduleofDerivativesInstrumentsDetails RISK MANAGEMENT AND FAIR VALUES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Derivatives Instruments) (Details) Details http://www.entergy.com/role/RISKMANAGEMENTANDFAIRVALUESEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 56 false false R57.htm 9955545 - Disclosure - RISK MANAGEMENT AND FAIR VALUES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Derivatives Not Designated As Hedging Instruments) (Details) Sheet http://www.entergy.com/role/RISKMANAGEMENTANDFAIRVALUESEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyScheduleofDerivativesNotDesignatedAsHedgingInstrumentsDetails RISK MANAGEMENT AND FAIR VALUES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Derivatives Not Designated As Hedging Instruments) (Details) Details http://www.entergy.com/role/RISKMANAGEMENTANDFAIRVALUESEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 57 false false R58.htm 9955546 - Disclosure - RISK MANAGEMENT AND FAIR VALUES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) Sheet http://www.entergy.com/role/RISKMANAGEMENTANDFAIRVALUESEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails RISK MANAGEMENT AND FAIR VALUES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) Details http://www.entergy.com/role/RISKMANAGEMENTANDFAIRVALUESEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 58 false false R59.htm 9955547 - Disclosure - RISK MANAGEMENT AND FAIR VALUES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Summary of Reconciliation of Changes in Net Assets) (Details) Sheet http://www.entergy.com/role/RISKMANAGEMENTANDFAIRVALUESEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergySummaryofReconciliationofChangesinNetAssetsDetails RISK MANAGEMENT AND FAIR VALUES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Summary of Reconciliation of Changes in Net Assets) (Details) Details http://www.entergy.com/role/RISKMANAGEMENTANDFAIRVALUESEntergyCorporationEntergyArkansasEntergyLouisianaEntergyMississippiEntergyNewOrleansEntergyTexasandSystemEnergyTables 59 false false R60.htm 9955548 - Disclosure - DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) (Narrative) (Details) Sheet http://www.entergy.com/role/DECOMMISSIONINGTRUSTFUNDSEntergyCorporationEntergyArkansasEntergyLouisianaandSystemEnergyNarrativeDetails DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) (Narrative) (Details) Details http://www.entergy.com/role/DECOMMISSIONINGTRUSTFUNDSEntergyCorporationEntergyArkansasEntergyLouisianaandSystemEnergyTables 60 false false R61.htm 9955549 - Disclosure - DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) (Summary of Available-for-Sale Debt Securities Held) (Details) Sheet http://www.entergy.com/role/DECOMMISSIONINGTRUSTFUNDSEntergyCorporationEntergyArkansasEntergyLouisianaandSystemEnergySummaryofAvailableforSaleDebtSecuritiesHeldDetails DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) (Summary of Available-for-Sale Debt Securities Held) (Details) Details http://www.entergy.com/role/DECOMMISSIONINGTRUSTFUNDSEntergyCorporationEntergyArkansasEntergyLouisianaandSystemEnergyTables 61 false false R62.htm 9955550 - Disclosure - DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) (Summary of Fair Value of AFS Debt Securities) (Details) Sheet http://www.entergy.com/role/DECOMMISSIONINGTRUSTFUNDSEntergyCorporationEntergyArkansasEntergyLouisianaandSystemEnergySummaryofFairValueofAFSDebtSecuritiesDetails DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) (Summary of Fair Value of AFS Debt Securities) (Details) Details http://www.entergy.com/role/DECOMMISSIONINGTRUSTFUNDSEntergyCorporationEntergyArkansasEntergyLouisianaandSystemEnergyTables 62 false false R63.htm 9955551 - Disclosure - DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) (Schedule of Investments Classified by Contractual Maturity Date) (Details) Sheet http://www.entergy.com/role/DECOMMISSIONINGTRUSTFUNDSEntergyCorporationEntergyArkansasEntergyLouisianaandSystemEnergyScheduleofInvestmentsClassifiedbyContractualMaturityDateDetails DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) (Schedule of Investments Classified by Contractual Maturity Date) (Details) Details http://www.entergy.com/role/DECOMMISSIONINGTRUSTFUNDSEntergyCorporationEntergyArkansasEntergyLouisianaandSystemEnergyTables 63 false false R64.htm 9955552 - Disclosure - DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) (Schedule of Realized Gain (Loss)) (Details) Sheet http://www.entergy.com/role/DECOMMISSIONINGTRUSTFUNDSEntergyCorporationEntergyArkansasEntergyLouisianaandSystemEnergyScheduleofRealizedGainLossDetails DECOMMISSIONING TRUST FUNDS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, and System Energy) (Schedule of Realized Gain (Loss)) (Details) Details http://www.entergy.com/role/DECOMMISSIONINGTRUSTFUNDSEntergyCorporationEntergyArkansasEntergyLouisianaandSystemEnergyTables 64 false false R65.htm 9955553 - 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