Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Electric Revenue		$ 2,248,262	$ 1,991,740
Gas Domestic Regulated Revenue		56,695	43,351
Competitive Energy Revenue		418,924	553,367
TOTAL		2,723,881	2,588,458
Residential [Member]
Electric Revenue		892,085
Commercial [Member]
Electric Revenue		595,720
Industrial [Member]
Electric Revenue		597,186
Governmental [Member]
Electric Revenue		56,478
Sales for Resale [Member]
Electric Revenue	[1]	69,526
Other Electric [Member]
Electric Revenue	[2]	27,433
Non-Customer [Member]
Electric Revenue	[3]	9,834
Competitive Energy Revenue	[3]	9,789
Competitive Business Sales [Member]
Competitive Energy Revenue	[1]	409,135
Retail [Member]
Electric Revenue		2,141,469
Entergy Arkansas [Member]
Electric Revenue		551,024	474,351
Gas Domestic Regulated Revenue		0
Entergy Arkansas [Member] | Residential [Member]
Electric Revenue		235,524
Entergy Arkansas [Member] | Commercial [Member]
Electric Revenue		120,634
Entergy Arkansas [Member] | Industrial [Member]
Electric Revenue		111,477
Entergy Arkansas [Member] | Governmental [Member]
Electric Revenue		4,648
Entergy Arkansas [Member] | Sales for Resale [Member]
Electric Revenue	[1]	66,103
Entergy Arkansas [Member] | Other Electric [Member]
Electric Revenue	[2]	10,024
Entergy Arkansas [Member] | Non-Customer [Member]
Electric Revenue	[3]	2,614
Entergy Arkansas [Member] | Retail [Member]
Electric Revenue		472,283
Entergy Louisiana [Member]
Electric Revenue		1,005,106	864,076
Gas Domestic Regulated Revenue		24,238	16,707
TOTAL		1,029,344	880,783
Entergy Louisiana [Member] | Residential [Member]
Electric Revenue		295,517
Entergy Louisiana [Member] | Commercial [Member]
Electric Revenue		224,928
Entergy Louisiana [Member] | Industrial [Member]
Electric Revenue		352,336
Entergy Louisiana [Member] | Governmental [Member]
Electric Revenue		17,310
Entergy Louisiana [Member] | Sales for Resale [Member]
Electric Revenue	[1]	89,255
Entergy Louisiana [Member] | Other Electric [Member]
Electric Revenue	[2]	20,503
Entergy Louisiana [Member] | Non-Customer [Member]
Electric Revenue	[3]	5,257
Entergy Louisiana [Member] | Retail [Member]
Electric Revenue		890,091
Entergy Mississippi [Member]
Electric Revenue		315,743	258,443
Gas Domestic Regulated Revenue		0
Entergy Mississippi [Member] | Residential [Member]
Electric Revenue		148,342
Entergy Mississippi [Member] | Commercial [Member]
Electric Revenue		110,460
Entergy Mississippi [Member] | Industrial [Member]
Electric Revenue		42,501
Entergy Mississippi [Member] | Governmental [Member]
Electric Revenue		10,848
Entergy Mississippi [Member] | Sales for Resale [Member]
Electric Revenue	[1]	1,993
Entergy Mississippi [Member] | Other Electric [Member]
Electric Revenue	[2]	(719)
Entergy Mississippi [Member] | Non-Customer [Member]
Electric Revenue	[3]	2,318
Entergy Mississippi [Member] | Retail [Member]
Electric Revenue		312,151
Entergy New Orleans [Member]
Electric Revenue		155,818	142,345
Gas Domestic Regulated Revenue		32,457	26,644
TOTAL		188,275	168,989
Entergy New Orleans [Member] | Residential [Member]
Electric Revenue		64,575
Entergy New Orleans [Member] | Commercial [Member]
Electric Revenue		54,272
Entergy New Orleans [Member] | Industrial [Member]
Electric Revenue		7,570
Entergy New Orleans [Member] | Governmental [Member]
Electric Revenue		17,691
Entergy New Orleans [Member] | Sales for Resale [Member]
Electric Revenue	[1]	13,337
Entergy New Orleans [Member] | Other Electric [Member]
Electric Revenue	[2]	(3,111)
Entergy New Orleans [Member] | Non-Customer [Member]
Electric Revenue	[3]	1,484
Entergy New Orleans [Member] | Retail [Member]
Electric Revenue		144,108
Entergy Texas [Member]
Electric Revenue		348,940	363,927
Gas Domestic Regulated Revenue		0
Entergy Texas [Member] | Residential [Member]
Electric Revenue		148,126
Entergy Texas [Member] | Commercial [Member]
Electric Revenue		85,427
Entergy Texas [Member] | Industrial [Member]
Electric Revenue		83,302
Entergy Texas [Member] | Governmental [Member]
Electric Revenue		5,981
Entergy Texas [Member] | Sales for Resale [Member]
Electric Revenue	[1]	23,361
Entergy Texas [Member] | Other Electric [Member]
Electric Revenue	[2]	2,264
Entergy Texas [Member] | Non-Customer [Member]
Electric Revenue	[3]	479
Entergy Texas [Member] | Retail [Member]
Electric Revenue		322,836
System Energy [Member]
Electric Revenue		$ 148,443	$ 154,787

[1] (a)Sales for resale and competitive businesses sales include day-ahead sales of energy in a market administered by an ISO. These sales represent financially binding commitments for the sale of physical energy the next day. These sales are adjusted to actual power generated and delivered in the real time market. Given the short duration of these transactions, Entergy does not consider them to be derivatives subject to fair value adjustments, and includes them as part of customer revenues.

[2] (b)Other electric revenues consist primarily of transmission and ancillary services provided to participants of an ISO-administered market and unbilled revenue.

[3] (c)Non-customer revenues include the settlement of financial hedges, occasional sales of inventory, alternative revenue programs, provisions for revenue subject to refund, and late fees.