Rate And Regulatory Matters (Narrative) (Details)	1 Months Ended						3 Months Ended
	Apr. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) $ / kWh	Jan. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Aug. 31, 2017	Jul. 31, 2015 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Regulatory Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use							$ 25,800,000	$ 145,026,000
Deferred Fuel Cost		$ 83,445,000		$ 95,746,000			83,445,000
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Earned return on common equity			9.06%
Authorized return on common equity					9.95%
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		27,000,000					27,000,000
Entergy Louisiana [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Earned return on common equity	10.79%
Public Utilities, proposed customer credits	$ 700,000
Proposed prospective reduction in the gas infrastructure rider	$ 200,000
Authorized return on common equity	9.95%
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
Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Deferred Fuel Cost		18,627,000		32,444,000			18,627,000
Proposed customer credits due to internal restructuring		27,000,000
Preferred Stock, Redemption Amount		21,200,000
Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Deferred Fuel Cost		3,535,000		0			3,535,000
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
Entergy Texas [Member]
Regulatory Assets [Line Items]
System Agreement Bandwidth Remedy Payments						$ 10,900,000
Refund for fuel cost recovery				30,500,000
Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Deferred Fuel Cost		$ 61,282,000		$ 63,302,000			$ 61,282,000
Rate At Which Electricity Sold To Retail Customers | $ / kWh		0.01547
Increase in Rate At Which Electricity Sold To Retail Customers | $ / kWh		0.01882