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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,666,209 $ 2,668,770 $ 5,275,792 $ 5,392,650
Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,345,727 2,330,225 4,466,751 4,578,486
Natural Gas, US Regulated [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 30,699 29,943 85,647 86,638
Competitive Businesses [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 289,783 308,602 723,394 727,526
Residential [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 770,373 768,710 1,572,911 1,660,795
Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 595,025 581,899 1,149,082 1,177,620
Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 641,733 624,818 1,242,734 1,222,004
Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 57,623 56,823 110,584 113,301
Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 75,318 69,212 159,753 138,738
Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 195,952 219,391 211,422 246,822
Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 9,703 9,372 20,265 19,206
Non-Customer [Member] | Competitive Businesses [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 9,385 (22,960) 82,525 (13,171)
Competitive Business Sales [Member] | Competitive Businesses [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 280,398 331,562 640,869 740,697
Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,064,754 2,032,250 4,075,311 4,173,720
Entergy Arkansas [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 542,929 494,605 1,088,741 1,045,629
Entergy Arkansas [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 542,929 494,605 1,088,741 1,045,629
Entergy Arkansas [Member] | Natural Gas, US Regulated [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Entergy Arkansas [Member] | Residential [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 157,714 159,130 367,581 394,654
Entergy Arkansas [Member] | Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 125,555 93,741 250,133 214,375
Entergy Arkansas [Member] | Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 118,913 97,973 240,491 209,450
Entergy Arkansas [Member] | Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 4,971 3,766 9,869 8,414
Entergy Arkansas [Member] | Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 74,501 53,195 154,085 119,299
Entergy Arkansas [Member] | Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 58,209 84,102 60,514 94,125
Entergy Arkansas [Member] | Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,066 2,698 6,068 5,312
Entergy Arkansas [Member] | Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 407,153 354,610 868,074 826,893
Entergy Louisiana [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,106,317 1,072,788 2,065,647 2,102,132
Entergy Louisiana [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,094,259 1,061,689 2,030,952 2,066,795
Entergy Louisiana [Member] | Natural Gas, US Regulated [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 12,058 11,099 34,695 35,337
Entergy Louisiana [Member] | Residential [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 290,366 267,915 554,431 563,433
Entergy Louisiana [Member] | Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 232,134 221,740 438,912 446,667
Entergy Louisiana [Member] | Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 384,919 368,678 731,598 721,014
Entergy Louisiana [Member] | Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 17,925 16,705 34,817 34,015
Entergy Louisiana [Member] | Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 83,208 111,801 167,164 201,056
Entergy Louisiana [Member] | Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 80,307 70,027 92,746 90,529
Entergy Louisiana [Member] | Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 5,400 4,823 11,284 10,081
Entergy Louisiana [Member] | Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 925,344 875,038 1,759,758 1,765,129
Entergy Mississippi [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 302,737 353,689 584,981 669,432
Entergy Mississippi [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 302,737 353,689 584,981 669,432
Entergy Mississippi [Member] | Natural Gas, US Regulated [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Entergy Mississippi [Member] | Residential [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 116,801 132,730 245,610 281,073
Entergy Mississippi [Member] | Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 102,275 117,351 200,189 227,811
Entergy Mississippi [Member] | Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 38,739 46,129 76,436 88,629
Entergy Mississippi [Member] | Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 10,521 11,452 20,557 22,300
Entergy Mississippi [Member] | Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 4,994 11,776 9,808 13,769
Entergy Mississippi [Member] | Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 26,982 31,696 27,387 30,977
Entergy Mississippi [Member] | Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,425 2,555 4,994 4,873
Entergy Mississippi [Member] | Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 268,336 307,662 542,792 619,813
Entergy New Orleans [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 175,793 178,446 338,987 366,721
Entergy New Orleans [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 157,152 159,602 288,035 315,420
Entergy New Orleans [Member] | Natural Gas, US Regulated [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 18,641 18,844 50,952 51,301
Entergy New Orleans [Member] | Residential [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 58,621 58,232 110,697 122,807
Entergy New Orleans [Member] | Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 53,981 54,524 99,723 108,796
Entergy New Orleans [Member] | Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 8,490 9,267 15,740 16,838
Entergy New Orleans [Member] | Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 18,984 18,448 34,886 36,139
Entergy New Orleans [Member] | Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 8,579 6,190 18,803 19,527
Entergy New Orleans [Member] | Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 7,263 11,623 5,556 8,511
Entergy New Orleans [Member] | Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,234 1,318 2,630 2,802
Entergy New Orleans [Member] | Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 140,076 140,471 261,046 284,580
Entergy Texas [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 363,580 403,486 704,054 752,426
Entergy Texas [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 363,580 403,486 704,054 752,426
Entergy Texas [Member] | Natural Gas, US Regulated [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Entergy Texas [Member] | Residential [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 146,871 150,703 294,592 298,828
Entergy Texas [Member] | Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 81,080 94,544 160,125 179,971
Entergy Texas [Member] | Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 90,672 102,771 178,470 186,073
Entergy Texas [Member] | Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 5,222 6,452 10,455 12,433
Entergy Texas [Member] | Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 14,772 25,177 31,548 48,538
Entergy Texas [Member] | Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 24,656 23,468 28,153 25,733
Entergy Texas [Member] | Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 307 371 711 850
Entergy Texas [Member] | Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 323,845 354,470 643,642 677,305
System Energy [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 139,009 $ 112,456 $ 279,113 $ 260,899