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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,412,788 $ 2,666,209 $ 4,839,967 $ 5,275,792  
Accounts Receivable, Allowance for Credit Loss, Current 43,281   43,281   $ 7,404
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     38,400    
Accounts Receivable, Allowance for Credit Loss, Writeoff     (8,600)    
Accounts Receivable, Allowance for Credit Loss, Recovery     6,000    
Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 2,190,557 2,345,727 4,241,196 4,466,751  
Natural Gas, US Regulated [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 22,495 30,699 66,471 85,647  
Competitive Businesses [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 199,736 289,783 532,300 723,394  
Residential [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 790,869 770,373 1,588,897 1,572,911  
Commercial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 526,121 595,025 1,065,061 1,149,082  
Industrial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 576,203 641,733 1,133,718 1,242,734  
Governmental [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 46,959 57,623 99,541 110,584  
Sales for Resale [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 52,761 75,318 106,487 159,753  
Other Electric [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 168,721 195,952 218,887 211,422  
Non-Customer [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 28,923 9,703 28,605 20,265  
Non-Customer [Member] | Competitive Businesses [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 24,016 9,385 140,577 82,525  
Competitive Business Sales [Member] | Competitive Businesses [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 175,720 280,398 391,723 640,869  
Billed Retail [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 1,940,152 2,064,754 3,887,217 4,075,311  
Customer | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 2,161,634 2,336,024 4,212,591 4,446,486  
Entergy Arkansas [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 491,767 542,929 973,679 1,088,741  
Accounts Receivable, Allowance for Credit Loss, Current 7,340   7,340   1,169
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     6,300    
Accounts Receivable, Allowance for Credit Loss, Writeoff     (1,800)    
Accounts Receivable, Allowance for Credit Loss, Recovery     1,600    
Entergy Arkansas [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 491,767 542,929 973,679 1,088,741  
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 171,171 157,714 390,859 367,581  
Entergy Arkansas [Member] | Commercial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 106,104 125,555 217,349 250,133  
Entergy Arkansas [Member] | Industrial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 106,254 118,913 207,342 240,491  
Entergy Arkansas [Member] | Governmental [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 4,344 4,971 8,374 9,869  
Entergy Arkansas [Member] | Sales for Resale [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 36,956 74,501 78,096 154,085  
Entergy Arkansas [Member] | Other Electric [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 63,537 58,209 65,134 60,514  
Entergy Arkansas [Member] | Non-Customer [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 3,401 3,066 6,525 6,068  
Entergy Arkansas [Member] | Billed Retail [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 387,873 407,153 823,924 868,074  
Entergy Arkansas [Member] | Customer | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 488,366 539,863 967,154 1,082,673  
Entergy Louisiana [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 1,011,652 1,106,317 1,942,299 2,065,647  
Accounts Receivable, Allowance for Credit Loss, Current 14,516   14,516   1,902
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     14,100    
Accounts Receivable, Allowance for Credit Loss, Writeoff     (3,500)    
Accounts Receivable, Allowance for Credit Loss, Recovery     2,000    
Entergy Louisiana [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 1,001,601 1,094,259 1,914,142 2,030,952  
Entergy Louisiana [Member] | Natural Gas, US Regulated [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 10,051 12,058 28,157 34,695  
Entergy Louisiana [Member] | Residential [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 301,105 290,366 560,965 554,431  
Entergy Louisiana [Member] | Commercial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 209,119 232,134 411,365 438,912  
Entergy Louisiana [Member] | Industrial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 335,201 384,919 657,542 731,598  
Entergy Louisiana [Member] | Governmental [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 16,781 17,925 33,535 34,817  
Entergy Louisiana [Member] | Sales for Resale [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 82,698 83,208 161,228 167,164  
Entergy Louisiana [Member] | Other Electric [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 53,104 80,307 85,113 92,746  
Entergy Louisiana [Member] | Non-Customer [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 3,593 5,400 4,394 11,284  
Entergy Louisiana [Member] | Billed Retail [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 862,206 925,344 1,663,407 1,759,758  
Entergy Louisiana [Member] | Customer | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 998,008 1,088,859 1,909,748 2,019,668  
Entergy Mississippi [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 297,954 302,737 591,876 584,981  
Accounts Receivable, Allowance for Credit Loss, Current 7,195   7,195   636
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     7,000    
Accounts Receivable, Allowance for Credit Loss, Writeoff     (1,200)    
Accounts Receivable, Allowance for Credit Loss, Recovery     800    
Entergy Mississippi [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 297,954 302,737 591,876 584,981  
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 112,361 116,801 239,463 245,610  
Entergy Mississippi [Member] | Commercial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 89,594 102,275 186,392 200,189  
Entergy Mississippi [Member] | Industrial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 35,874 38,739 72,264 76,436  
Entergy Mississippi [Member] | Governmental [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 9,798 10,521 20,125 20,557  
Entergy Mississippi [Member] | Sales for Resale [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 18,426 4,994 32,848 9,808  
Entergy Mississippi [Member] | Other Electric [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 29,393 26,982 35,836 27,387  
Entergy Mississippi [Member] | Non-Customer [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 2,508 2,425 4,948 4,994  
Entergy Mississippi [Member] | Billed Retail [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 247,627 268,336 518,244 542,792  
Entergy Mississippi [Member] | Customer | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 295,446 300,312 586,928 579,987  
Entergy New Orleans [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 147,343 175,793 296,645 338,987  
Accounts Receivable, Allowance for Credit Loss, Current 8,382   8,382   3,226
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     5,500    
Accounts Receivable, Allowance for Credit Loss, Writeoff     (1,000)    
Accounts Receivable, Allowance for Credit Loss, Recovery     700    
Entergy New Orleans [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 134,899 157,152 258,330 288,035  
Entergy New Orleans [Member] | Natural Gas, US Regulated [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 12,444 18,641 38,315 50,952  
Entergy New Orleans [Member] | Residential [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 53,420 58,621 104,319 110,697  
Entergy New Orleans [Member] | Commercial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 36,401 53,981 81,905 99,723  
Entergy New Orleans [Member] | Industrial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 3,066 8,490 10,413 15,740  
Entergy New Orleans [Member] | Governmental [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 10,475 18,984 26,326 34,886  
Entergy New Orleans [Member] | Sales for Resale [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 8,018 8,579 18,188 18,803  
Entergy New Orleans [Member] | Other Electric [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 3,999 7,263 4,763 5,556  
Entergy New Orleans [Member] | Non-Customer [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 19,520 1,234 12,416 2,630  
Entergy New Orleans [Member] | Billed Retail [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 103,362 140,076 222,963 261,046  
Entergy New Orleans [Member] | Customer | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 115,379 155,918 245,914 285,405  
Entergy Texas [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 372,194 363,580 711,530 704,054  
Accounts Receivable, Allowance for Credit Loss, Current 5,848   5,848   $ 471
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     5,500    
Accounts Receivable, Allowance for Credit Loss, Writeoff     (1,100)    
Accounts Receivable, Allowance for Credit Loss, Recovery     900    
Entergy Texas [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 372,194 363,580 711,530 704,054  
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 152,811 146,871 293,291 294,592  
Entergy Texas [Member] | Commercial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 84,904 81,080 168,050 160,125  
Entergy Texas [Member] | Industrial [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 95,809 90,672 186,157 178,470  
Entergy Texas [Member] | Governmental [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 5,560 5,222 11,180 10,455  
Entergy Texas [Member] | Sales for Resale [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 13,187 14,772 21,815 31,548  
Entergy Texas [Member] | Other Electric [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 20,039 24,656 30,742 28,153  
Entergy Texas [Member] | Non-Customer [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax (116) 307 295 711  
Entergy Texas [Member] | Billed Retail [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 339,084 323,845 658,678 643,642  
Entergy Texas [Member] | Customer | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 372,310 363,273 711,235 703,343  
System Energy [Member] | Electricity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax $ 126,049 $ 139,009 $ 256,713 $ 279,113