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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,903,568 $ 3,140,575 $ 7,743,534 $ 8,416,367    
Accounts Receivable, Allowance for Credit Loss, Current 73,426   73,426     $ 7,404
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     66,900      
Accounts Receivable, Allowance for Credit Loss, Writeoff     (8,600)      
Accounts Receivable, Allowance for Credit Loss, Recovery     7,700      
Regulatory asset related to bad debt expenses associated with COVID-19 pandemic 51,000   51,000      
Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 2,666,805 2,812,934 6,907,999 7,279,683    
Natural Gas, US Regulated [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 22,357 27,269 88,829 112,916    
Competitive Businesses [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 214,406 300,372 746,706 1,023,768    
Residential [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 1,153,220 1,154,455 2,742,118 2,727,367    
Commercial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 647,119 722,334 1,712,179 1,871,416    
Industrial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 589,648 686,122 1,723,367 1,928,857    
Governmental [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 56,710 61,697 156,251 172,280    
Sales for Resale [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 145,187 63,082 251,674 222,834    
Other Electric [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 69,122 115,352 288,009 326,771    
Non-Customer [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 5,799 9,892 34,401 30,158    
Non-Customer [Member] | Competitive Businesses [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 19,222 17,952 159,800 100,480    
Competitive Business Sales [Member] | Competitive Businesses [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 195,184 282,420 586,906 923,288    
Billed Retail [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 2,446,697 2,624,608 6,333,915 6,699,920    
Customer | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 2,661,006 2,803,042 6,873,598 7,249,525    
Entergy Arkansas [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 644,389 687,526 1,618,068 1,776,267    
Accounts Receivable, Allowance for Credit Loss, Current 12,229   12,229     1,169
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     10,600      
Accounts Receivable, Allowance for Credit Loss, Writeoff     (1,800)      
Accounts Receivable, Allowance for Credit Loss, Recovery     2,200      
Regulatory asset related to costs associated with COVID-19 pandemic 6,100   6,100      
Regulatory asset related to bad debt expenses associated with COVID-19 pandemic 6,100   6,100      
Entergy Arkansas [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 644,389 687,526 1,618,068 1,776,267    
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 274,496 253,627 665,355 621,208    
Entergy Arkansas [Member] | Commercial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 137,764 162,564 355,112 412,697    
Entergy Arkansas [Member] | Industrial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 138,037 156,024 345,378 396,515    
Entergy Arkansas [Member] | Governmental [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 5,133 5,907 13,508 15,776    
Entergy Arkansas [Member] | Sales for Resale [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 64,494 58,953 142,590 213,038    
Entergy Arkansas [Member] | Other Electric [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 17,677 47,085 82,811 107,599    
Entergy Arkansas [Member] | Non-Customer [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 6,788 3,366 13,314 9,434    
Entergy Arkansas [Member] | Billed Retail [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 555,430 578,122 1,379,353 1,446,196    
Entergy Arkansas [Member] | Customer | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 637,601 684,160 1,604,754 1,766,833    
Entergy Louisiana [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 1,120,022 1,231,677 3,062,321 3,297,324    
Accounts Receivable, Allowance for Credit Loss, Current 27,157   27,157     1,902
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     26,300      
Accounts Receivable, Allowance for Credit Loss, Writeoff     (3,500)      
Accounts Receivable, Allowance for Credit Loss, Recovery     2,500      
Regulatory asset related to costs associated with COVID-19 pandemic 27,400   27,400      
Regulatory asset related to bad debt expenses associated with COVID-19 pandemic 20,900   20,900      
Entergy Louisiana [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 1,110,217 1,221,874 3,024,359 3,252,826    
Entergy Louisiana [Member] | Natural Gas, US Regulated [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 9,805 9,803 37,962 44,498    
Entergy Louisiana [Member] | Residential [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 413,442 426,012 974,407 980,443    
Entergy Louisiana [Member] | Commercial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 248,276 277,071 659,641 715,983    
Entergy Louisiana [Member] | Industrial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 316,876 376,595 974,419 1,108,193    
Entergy Louisiana [Member] | Governmental [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 17,449 18,731 50,984 53,547    
Entergy Louisiana [Member] | Sales for Resale [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 81,843 81,664 243,071 248,827    
Entergy Louisiana [Member] | Other Electric [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 35,097 37,521 120,209 130,269    
Entergy Louisiana [Member] | Non-Customer [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax (2,766) 4,280 1,628 15,564    
Entergy Louisiana [Member] | Billed Retail [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 996,043 1,098,409 2,659,451 2,858,166    
Entergy Louisiana [Member] | Customer | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 1,112,983 1,217,594 3,022,731 3,237,262    
Entergy Mississippi [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 356,496 398,732 948,372 983,713    
Accounts Receivable, Allowance for Credit Loss, Current 11,385   11,385     636
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     11,000      
Accounts Receivable, Allowance for Credit Loss, Writeoff     (1,200)      
Accounts Receivable, Allowance for Credit Loss, Recovery     1,000      
Regulatory asset related to costs associated with COVID-19 pandemic 10,400   10,400      
Regulatory asset related to bad debt expenses associated with COVID-19 pandemic 8,400   8,400      
Entergy Mississippi [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 356,496 398,732 948,372 983,713    
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 161,031 177,785 400,495 423,395    
Entergy Mississippi [Member] | Commercial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 109,432 131,596 295,823 331,785    
Entergy Mississippi [Member] | Industrial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 34,062 44,054 106,327 120,490    
Entergy Mississippi [Member] | Governmental [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 10,917 12,551 31,043 33,108    
Entergy Mississippi [Member] | Sales for Resale [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 29,535 9,569 62,383 19,377    
Entergy Mississippi [Member] | Other Electric [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 9,612 20,499 45,448 47,887    
Entergy Mississippi [Member] | Non-Customer [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 1,907 2,678 6,853 7,671    
Entergy Mississippi [Member] | Billed Retail [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 315,442 365,986 833,688 908,778    
Entergy Mississippi [Member] | Customer | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 354,589 396,054 941,519 976,042    
Entergy New Orleans [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 182,064 194,204 478,709 533,191    
Accounts Receivable, Allowance for Credit Loss, Current 12,025   12,025     3,226
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     8,800      
Accounts Receivable, Allowance for Credit Loss, Writeoff     (1,000)      
Accounts Receivable, Allowance for Credit Loss, Recovery     1,000      
Regulatory asset related to costs associated with COVID-19 pandemic         $ 8,400  
Regulatory asset related to bad debt expenses associated with COVID-19 pandemic 7,700   7,700      
Entergy New Orleans [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 169,512 176,738 427,842 464,773    
Entergy New Orleans [Member] | Natural Gas, US Regulated [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 12,552 17,466 50,867 68,418    
Entergy New Orleans [Member] | Residential [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 83,242 81,468 187,561 192,165    
Entergy New Orleans [Member] | Commercial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 50,565 56,430 132,470 156,152    
Entergy New Orleans [Member] | Industrial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 7,219 8,613 17,632 24,353    
Entergy New Orleans [Member] | Governmental [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 17,187 19,030 43,512 53,916    
Entergy New Orleans [Member] | Sales for Resale [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 9,057 6,876 27,245 25,680    
Entergy New Orleans [Member] | Other Electric [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 2,403 2,537 7,166 8,093    
Entergy New Orleans [Member] | Non-Customer [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax (161) 1,784 12,256 4,414    
Entergy New Orleans [Member] | Billed Retail [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 158,213 165,541 381,175 426,586    
Entergy New Orleans [Member] | Customer | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 169,673 174,954 415,586 460,359    
Entergy Texas [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 494,922 442,877 1,206,452 1,146,931    
Accounts Receivable, Allowance for Credit Loss, Current 10,629   10,629     $ 471
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)     10,200      
Accounts Receivable, Allowance for Credit Loss, Writeoff     (1,100)      
Accounts Receivable, Allowance for Credit Loss, Recovery     1,000      
Regulatory asset related to costs associated with COVID-19 pandemic 8,700   8,700      
Regulatory asset related to bad debt expenses associated with COVID-19 pandemic 7,900   7,900      
Entergy Texas [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 494,922 442,877 1,206,452 1,146,931    
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 221,009 215,563 514,300 510,156    
Entergy Texas [Member] | Commercial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 101,082 94,673 269,133 254,799    
Entergy Texas [Member] | Industrial [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 93,454 100,836 279,611 279,306    
Entergy Texas [Member] | Governmental [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 6,024 5,478 17,204 15,933    
Entergy Texas [Member] | Sales for Resale [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 67,643 16,704 89,459 48,251    
Entergy Texas [Member] | Other Electric [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 5,685 9,177 36,426 37,329    
Entergy Texas [Member] | Non-Customer [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 25 446 319 1,157    
Entergy Texas [Member] | Billed Retail [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 421,569 416,550 1,080,248 1,060,194    
Entergy Texas [Member] | Customer | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax 494,897 442,431 1,206,133 1,145,774    
System Energy [Member] | Electricity [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax $ 148,517 $ 145,472 $ 405,230 $ 424,585