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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenue from Contract with Customer, Excluding Assessed Tax $ 3,140,575 $ 3,104,319 $ 8,416,367 $ 8,496,970
Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,812,934 2,697,887 7,279,683 7,276,374
Natural Gas, US Regulated [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 27,269 26,352 112,916 112,990
Competitive Businesses [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 300,372 380,080 1,023,768 1,107,606
Residential [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,154,455 1,138,744 2,727,367 2,799,539
Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 722,334 693,760 1,871,416 1,871,380
Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 686,122 682,823 1,928,857 1,904,828
Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 61,697 60,647 172,280 173,949
Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 63,082 76,247 222,834 214,984
Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 115,352 42,847 326,771 289,668
Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 9,892 2,819 30,158 22,026
Non-Customer [Member] | Competitive Businesses [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 17,952 (27,683) 100,480 (40,854)
Competitive Business Sales [Member] | Competitive Businesses [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 282,420 407,763 923,288 1,148,460
Billed Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,624,608 2,575,974 6,699,920 6,749,696
Entergy Arkansas [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 687,526 568,399 1,776,267 1,614,028
Entergy Arkansas [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 687,526 568,399 1,776,267 1,614,028
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 253,627 250,081 621,208 644,735
Entergy Arkansas [Member] | Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 162,564 119,950 412,697 334,325
Entergy Arkansas [Member] | Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 156,024 126,079 396,515 335,529
Entergy Arkansas [Member] | Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 5,907 4,445 15,776 12,859
Entergy Arkansas [Member] | Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 58,953 60,338 213,038 179,637
Entergy Arkansas [Member] | Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 47,085 4,446 107,599 98,571
Entergy Arkansas [Member] | Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,366 3,060 9,434 8,372
Entergy Arkansas [Member] | Billed Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 578,122 500,555 1,446,196 1,327,448
Entergy Louisiana [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,231,677 1,206,612 3,297,324 3,308,744
Entergy Louisiana [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,221,874 1,196,278 3,252,826 3,263,073
Entergy Louisiana [Member] | Natural Gas, US Regulated [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 9,803 10,334 44,498 45,671
Entergy Louisiana [Member] | Residential [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 426,012 408,680 980,443 972,113
Entergy Louisiana [Member] | Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 277,071 272,985 715,983 719,652
Entergy Louisiana [Member] | Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 376,595 393,884 1,108,193 1,114,898
Entergy Louisiana [Member] | Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 18,731 17,566 53,547 51,581
Entergy Louisiana [Member] | Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 81,664 71,634 248,827 272,690
Entergy Louisiana [Member] | Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 37,521 34,220 130,269 124,749
Entergy Louisiana [Member] | Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 4,280 (2,691) 15,564 7,390
Entergy Louisiana [Member] | Billed Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,098,409 1,093,115 2,858,166 2,858,244
Entergy Mississippi [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 398,732 367,734 983,713 1,037,166
Entergy Mississippi [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 398,732 367,734 983,713 1,037,166
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 177,785 170,258 423,395 451,331
Entergy Mississippi [Member] | Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 131,596 126,987 331,785 354,799
Entergy Mississippi [Member] | Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 44,054 44,383 120,490 133,012
Entergy Mississippi [Member] | Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 12,551 11,488 33,108 33,788
Entergy Mississippi [Member] | Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 9,569 7,876 19,377 21,645
Entergy Mississippi [Member] | Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 20,499 4,079 47,887 35,055
Entergy Mississippi [Member] | Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,678 2,663 7,671 7,536
Entergy Mississippi [Member] | Billed Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 365,986 353,116 908,778 972,930
Entergy New Orleans [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 194,204 200,182 533,191 566,903
Entergy New Orleans [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 176,738 184,164 464,773 499,584
Entergy New Orleans [Member] | Natural Gas, US Regulated [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 17,466 16,018 68,418 67,319
Entergy New Orleans [Member] | Residential [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 81,468 86,014 192,165 208,821
Entergy New Orleans [Member] | Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 56,430 62,428 156,152 171,224
Entergy New Orleans [Member] | Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 8,613 9,655 24,353 26,493
Entergy New Orleans [Member] | Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 19,030 20,364 53,916 56,503
Entergy New Orleans [Member] | Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 6,876 4,863 25,680 24,390
Entergy New Orleans [Member] | Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,537 (1,107) 8,093 7,404
Entergy New Orleans [Member] | Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,784 1,947 4,414 4,749
Entergy New Orleans [Member] | Billed Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 165,541 178,461 426,586 463,041
Entergy Texas [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 442,877 477,231 1,146,931 1,229,657
Entergy Texas [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 442,877 477,231 1,146,931 1,229,657
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 215,563 223,711 510,156 522,539
Entergy Texas [Member] | Commercial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 94,673 111,409 254,799 291,380
Entergy Texas [Member] | Industrial [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 100,836 108,823 279,306 294,896
Entergy Texas [Member] | Governmental [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 5,478 6,785 15,933 19,218
Entergy Texas [Member] | Sales for Resale [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 16,704 23,290 48,251 71,828
Entergy Texas [Member] | Other Electric [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 9,177 2,735 37,329 28,468
Entergy Texas [Member] | Non-Customer [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 446 478 1,157 1,328
Entergy Texas [Member] | Billed Retail [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 416,550 450,728 1,060,194 1,128,033
System Energy [Member] | Electricity [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 145,472 $ 78,965 $ 424,585 $ 339,864