Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,609,584	$ 2,723,881
Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,121,024	2,248,262
Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	54,948	56,695
Competitive Businesses [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	433,612	418,924
Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	802,539	892,085
Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	554,058	595,720
Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	601,000	597,186
Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	52,960	56,478
Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	84,435	69,526
Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	15,470	27,433
Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	10,562	9,834
Non-Customer [Member] | Competitive Businesses [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	73,141	9,789
Competitive Business Sales [Member] | Competitive Businesses [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	360,471	409,135
Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,010,557	2,141,469
Entergy Arkansas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	545,812	551,024
Entergy Arkansas [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	545,812	551,024
Entergy Arkansas [Member] | Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Entergy Arkansas [Member] | Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	209,867	235,524
Entergy Arkansas [Member] | Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	124,578	120,634
Entergy Arkansas [Member] | Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	121,577	111,477
Entergy Arkansas [Member] | Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	4,899	4,648
Entergy Arkansas [Member] | Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	79,584	66,103
Entergy Arkansas [Member] | Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,304	10,024
Entergy Arkansas [Member] | Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	3,003	2,614
Entergy Arkansas [Member] | Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	460,921	472,283
Entergy Louisiana [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	959,330	1,029,344
Entergy Louisiana [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	936,693	1,005,106
Entergy Louisiana [Member] | Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	22,637	24,238
Entergy Louisiana [Member] | Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	264,065	295,517
Entergy Louisiana [Member] | Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	206,779	224,928
Entergy Louisiana [Member] | Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	346,678	352,336
Entergy Louisiana [Member] | Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	16,891	17,310
Entergy Louisiana [Member] | Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	83,955	89,255
Entergy Louisiana [Member] | Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	12,441	20,503
Entergy Louisiana [Member] | Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	5,884	5,257
Entergy Louisiana [Member] | Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	834,413	890,091
Entergy Mississippi [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	282,244	315,743
Entergy Mississippi [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	282,244	315,743
Entergy Mississippi [Member] | Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Entergy Mississippi [Member] | Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	128,809	148,342
Entergy Mississippi [Member] | Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	97,914	110,460
Entergy Mississippi [Member] | Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	37,697	42,501
Entergy Mississippi [Member] | Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	10,036	10,848
Entergy Mississippi [Member] | Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	4,814	1,993
Entergy Mississippi [Member] | Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	405	(719)
Entergy Mississippi [Member] | Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,569	2,318
Entergy Mississippi [Member] | Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	274,456	312,151
Entergy New Orleans [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	163,194	188,275
Entergy New Orleans [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	130,883	155,818
Entergy New Orleans [Member] | Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	32,311	32,457
Entergy New Orleans [Member] | Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	52,076	64,575
Entergy New Orleans [Member] | Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	45,741	54,272
Entergy New Orleans [Member] | Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7,250	7,570
Entergy New Orleans [Member] | Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	15,901	17,691
Entergy New Orleans [Member] | Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	10,224	13,337
Entergy New Orleans [Member] | Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	(1,706)	(3,111)
Entergy New Orleans [Member] | Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,397	1,484
Entergy New Orleans [Member] | Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	120,968	144,108
Entergy Texas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	340,474	348,940
Entergy Texas [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	340,474	348,940
Entergy Texas [Member] | Natural Gas, US Regulated [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Entergy Texas [Member] | Residential [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	147,722	148,126
Entergy Texas [Member] | Commercial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	79,046	85,427
Entergy Texas [Member] | Industrial [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	87,798	83,302
Entergy Texas [Member] | Governmental [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	5,233	5,981
Entergy Texas [Member] | Sales for Resale [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	16,775	23,361
Entergy Texas [Member] | Other Electric [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	3,496	2,264
Entergy Texas [Member] | Non-Customer [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	404	479
Entergy Texas [Member] | Retail [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	319,799	322,836
System Energy [Member] | Electricity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 140,104	$ 148,443