Rate And Regulatory Matters (Narrative) (Details)	1 Months Ended													3 Months Ended	4 Months Ended	9 Months Ended		12 Months Ended		72 Months Ended
	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Aug. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	May 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) $ / kWh	Jan. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Aug. 31, 2017	Jan. 31, 2017	Jul. 31, 2015 USD ($)	Sep. 30, 2018 USD ($)	Oct. 31, 2016 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2024 USD ($)
Regulatory Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use																$ 210,263,000	$ 241,838,000
Deferred Fuel Cost		$ 61,309,000								$ 95,746,000				$ 61,309,000		61,309,000			$ 95,746,000
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Reduction in Revenue Requirement				$ 3,500,000
Earned return on common equity							10.79%		9.06%
Public Utilities, proposed customer credits							$ 700,000
Proposed prospective reduction in the gas infrastructure rider							$ 200,000
Authorized return on common equity							9.95%				9.95%
Earned Return on Common Equity Resulting From Revenue-Neutral Realignments to Other Recovery Mechanisms					8.16%
Earnings bandwidth basis points											16000.00%
Reduced earnings bandwidth basis points											8000.00%
Public Utilities, Requested Increase in Revenue Requirement									$ 100,000
Monthly increase in regulatory liability related to Tax Act																9,100,000
Regulatory liability related to Tax Act		67,000,000												67,000,000		67,000,000
Target earned return on common equity							9.80%
Common equity basis point bandwidth							$ 60
Cap on potential revenue increase for 2018 rate case evaluation period							35,000,000
Cap on potential revenue increase for 2018 and 2019 rate case evaluation periods							70,000,000
Requirement for excess transmission project costs eligible for costs recovery mechanism							$ 100,000,000
Earned Return on Common Equity Excluding Realignments					9.88%
Rate Increase Included in Formula Rate Plan					$ 4,800,000
Formula rate plan increase excluding Tax Cuts and Jobs Act Credits					98,000,000
Formula rate plan revenue decrease			$ 17,600,000
Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Authorized Storm Damage Reserve Balance		15,000,000			15,000,000									15,000,000		15,000,000
Balance At Which Storm Damage Accrual Will Return To Current Level																10,000,000
Deferred Fuel Cost		22,618,000								32,444,000				22,618,000		22,618,000			32,444,000
System Agreement Bandwidth Remedy Payments																16,000,000
Monthly storm damage provision			$ 0													1,750,000
Offset of Unprotected Excess ADIT Against Net Utility Plant Approved in Stipulation					127,200,000
Offset of Unprotected Excess ADIT Against Other Regulatory Assets Approved in Stipulation					2,200,000
Return of excess ADIT through customer bill credits														25,800,000
Return of unprotected excess ADIT through sale of fuel oil inventory														5,800,000
Proposed customer credits due to internal restructuring								$ 27,000,000
Approved customer credits due to internal restructuring		$ 27,000,000
Preferred Stock, Redemption Amount								21,200,000
Entergy Mississippi [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
MPSC approved customer credits due to internal restructuring																				$ 4,500,000
Entergy New Orleans [Member]
Regulatory Assets [Line Items]
System Agreement Bandwidth Remedy Payments																5,000,000
Benefit to electric customers related to reduction in income tax expense under Tax Act								8,200,000
Benefit to gas customers related to reduction in income tax expense under Tax Act								$ 1,300,000
Allocation of benefits resulting from Tax Cuts and Jobs Act to Energy Smart Programs					13,500,000
Incremental costs related to one year acceleration of implementation of advanced metering infrastructure					$ 4,400,000
Estimated implementation costs for advanced metering infrastructure (AMI)																79,400,000
Entergy New Orleans [Member] | Electricity [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage		10.50%
Proposed rate reduction in revised filing		$ 20,300,000
Revised Increase In Rate Base Request		135,200,000
Portion of base rate increase associated with moving costs from rider into rates		131,500,000
Proposed surcharge to recover advanced metering infrastructure costs		7,100,000
Rate reduction due to decrease in projected fuel and energy efficiency riders		$ 31,100,000
Return on equity including performance adder provision		10.75%
Entergy New Orleans [Member] | Natural Gas [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage		10.75%
Proposed rate reduction in revised filing		$ 142,000
Entergy New Orleans [Member] | Minimum [Member]
Regulatory Assets [Line Items]
Earnings bandwidth basis points				5000.00%
Entergy New Orleans [Member] | Maximum [Member]
Regulatory Assets [Line Items]
Earnings bandwidth basis points				5000.00%
Entergy Texas [Member]
Regulatory Assets [Line Items]
System Agreement Bandwidth Remedy Payments													$ 10,900,000		$ 10,900,000	6,000,000
Refund for fuel cost recovery										30,500,000
Public Utilities, Requested Increase in Revenue Requirement						$ 118,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount						166,000,000
Portion of requested increase in base rates associated with moving costs						$ 48,000,000
Entergy Texas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 53,200,000
Refund due customers resulting from lower federal income tax rate	25,000,000
Capitalized skylining tree hazard costs	6,000,000
Refund to customers of protected excess accumulated deferred taxes	242,500,000
Return of excess ADIT through customer bill credits	185,200,000
Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Payments due Utility Operating Companies Related to Opportunity Sales Proceedings		68,000,000												68,000,000		68,000,000
Interest owed to Utility operating companies on Opportunity Sales proceeding		64,000,000												64,000,000		64,000,000
Total payable including interest due Utiilty operating companies resulting from Opportunity Sales proceeding		132,000,000												132,000,000		132,000,000
Regulatory Asset Recorded to Represent Estimate of Recoverable Retail Portion of Costs		114,000,000												114,000,000		114,000,000
Deferred Fuel Cost		$ 38,691,000								$ 63,302,000				38,691,000		$ 38,691,000			63,302,000
Rate At Which Electricity Sold To Retail Customers | $ / kWh								0.01547
Increase in Rate At Which Electricity Sold To Retail Customers | $ / kWh								0.01882
Projected Revenue Deficiency																			$ 95,600,000
Projected Increase in Revenue Requirement				$ 169,000,000
Annual revenue constraint per rate class percentage				400.00%
Reduced proposed increase in revenue requirement to comply with annual revenue constraint				$ 65,400,000
Entergy Arkansas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Portion of Energy Cost Recovery Rider Redetermination Subject to Possible Refund to Customers	$ 45,700,000
Projected Revenue Deficiency																		$ 73,400,000
Proposed customer credits due to internal restructuring																				$ 39,600,000
System Energy [Member]
Regulatory Assets [Line Items]
Earned return on common equity																10.94%
Percent Interest in Grand Gulf						11.50%										90.00%
Reduction of previously recorded deprecation expense														$ 26,000,000
System Energy [Member] | Minimum [Member]
Regulatory Assets [Line Items]
Earned return on common equity												8.37%
System Energy [Member] | Maximum [Member]
Regulatory Assets [Line Items]
Earned return on common equity												8.67%