Rate And Regulatory Matters (Narrative) (Details)	1 Months Ended											4 Months Ended	6 Months Ended		12 Months Ended
	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 ($)	Oct. 31, 2016 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)
Regulatory Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use													$ 51,503,000	$ 220,828,000
Deferred Fuel Cost			$ 114,293,000					$ 95,746,000					114,293,000			$ 95,746,000
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
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			$ 55,000,000										55,000,000
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
Entergy Louisiana [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Reduction in Revenue Requirement		$ 3,500,000
Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Authorized Storm Damage Reserve Balance			15,000,000										15,000,000
Balance At Which Storm Damage Accrual Will Return To Current Level													10,000,000
Deferred Fuel Cost			25,912,000					32,444,000					25,912,000			32,444,000
System Agreement Bandwidth Remedy Payments													16,000,000
Monthly storm damage provision													1,750,000
Offset of Unprotected Excess ADIT Against Net Utility Plant Approved in Stipulation			127,200,000										127,200,000
Offset of Unprotected Excess ADIT Against Other Regulatory Assets Approved in Stipulation			2,200,000										2,200,000
Proposed 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]
Monthly storm damage provision	$ 0
Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Deferred Fuel Cost			19,282,000					0					19,282,000			0
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] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Reduction in Revenue Requirement		$ 20,000,000
Earned return on common equity		10.75%
Earnings bandwidth basis points		10000.00%
Proposed Reduction in Revenue Requirement for Electric Rates		$ 20,000,000
Proposed Reduction in Revenue Requirement for Gas Rates		$ 129,000
Entergy New Orleans [Member] | Subsequent Event [Member] | Minimum [Member]
Regulatory Assets [Line Items]
Earnings bandwidth basis points		5000.00%
Entergy New Orleans [Member] | Subsequent Event [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
Portion of unprotected excess ADIT included in proposed rates				$ 202,000,000
Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Deferred Fuel Cost			$ 69,099,000					$ 63,302,000					$ 69,099,000			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
Entergy Arkansas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Projected Revenue Deficiency															$ 73,400,000
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
System Energy [Member]
Regulatory Assets [Line Items]
Earned return on common equity													10.94%
Percent Interest in Grand Gulf				11.50%									90.00%
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%