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Rate And Regulatory Matters (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 8 Months Ended 12 Months Ended 14 Months Ended 24 Months Ended 36 Months Ended
Apr. 30, 2021
Mar. 31, 2021
Feb. 28, 2021
Dec. 31, 2020
Nov. 30, 2020
Oct. 31, 2020
May 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2021
Feb. 28, 2021
Aug. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2020
Aug. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Jun. 30, 2020
Apr. 30, 2020
Regulatory Assets [Line Items]                                          
Impairment of Long-Lived Assets Held-for-use               $ 3,278,000 $ 4,962,000                        
Public Utilities, Property, Plant and Equipment, Construction Work in Progress   $ 1,311,997,000   $ 2,012,030,000       1,311,997,000           $ 1,311,997,000 $ 2,012,030,000            
Proceeds from the issuance of long-term debt               3,676,242,000 3,195,345,000                        
Entergy Louisiana [Member]                                          
Regulatory Assets [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount             $ 109,500,000               63,000,000            
Regulatory asset related to costs associated with COVID-19 pandemic   47,800,000           47,800,000           47,800,000              
Public Utilities, Property, Plant and Equipment, Construction Work in Progress   526,575,000   667,281,000       526,575,000           526,575,000 667,281,000            
Proceeds from the issuance of long-term debt               1,399,245,000 1,221,900,000                        
Amount transfer from restricted escrow account as storm damage reserve         $ 257,000,000                                
Estimated remaining costs for completion of J. Wayne Leonard Power Station               3,100,000                          
Entergy Louisiana [Member] | Mortgage Bonds Zero Point Six Two Percent Series Due November 2023                                          
Regulatory Assets [Line Items]                                          
Proceeds from the issuance of long-term debt         $ 1,100,000,000                                
Debt instrument, interest rate, stated percentage         0.62%                                
Entergy Louisiana [Member] | Winter Storm Uri                                          
Regulatory Assets [Line Items]                                          
Fuel Costs     $ 166,000,000                                    
Entergy Louisiana [Member] | Subsequent Event [Member]                                          
Regulatory Assets [Line Items]                                          
Distribution recovery mechanism - amount per year                                     $ 225,000,000    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent                                     21.00%    
Formula rate plan revenue increase limit - exclusive of riders                                 $ 70,000,000        
Deferral of expenditures on vegetation management                                   $ 7,000,000      
Authorized return on common equity                                     9.50%    
Storm Reserve Escrow Account $ 290,000,000                                        
Entergy Louisiana [Member] | Subsequent Event [Member] | Hurricanes Laura, Delta, Zeta, and Winter Storm Uri [Domain]                                          
Regulatory Assets [Line Items]                                          
Total Restoration Costs For Repair and Replacement of Electrical System 2,050,000,000.00                                        
Non-capital storm costs 310,000,000                                        
Deferred Storm and Property Reserve Deficiency, Noncurrent 1,740,000,000                                        
Total Restoration Costs For Repair and Replacement of Electrical System including carrying costs 2,100,000,000                                        
Entergy Louisiana [Member] | Subsequent Event [Member] | Minimum [Member]                                          
Regulatory Assets [Line Items]                                          
Authorized return on common equity                                     9.00%    
Entergy Louisiana [Member] | Subsequent Event [Member] | Maximum [Member]                                          
Regulatory Assets [Line Items]                                          
Authorized return on common equity                                     10.00%    
Entergy Mississippi [Member]                                          
Regulatory Assets [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount   95,400,000                                      
Rate Increase Included in Formula Rate Plan   44,300,000                                      
Regulatory asset related to costs associated with COVID-19 pandemic   16,300,000           16,300,000           16,300,000              
Public Utilities, Property, Plant and Equipment, Construction Work in Progress   $ 192,649,000   134,854,000       192,649,000           192,649,000 134,854,000            
Proceeds from the issuance of long-term debt               200,573,000 0                        
Public Utilities, Requested Return on Equity, Percentage   6.69%                                      
Cap on 2020 retail revenues   2.00%                                      
Demand side management costs   $ 3,900,000                                      
Interim increase in formula rate plan revenues   16,800,000                                      
Interim rate adjustment   1,700,000                                      
Total interim rate adjustments   18,500,000                                      
Interim increase in formula rate plan revenues due to adjustments   22,100,000                                      
Formula rate plan revenue increase including demand side management costs   $ 48,200,000                                      
Entergy Mississippi [Member] | Maximum [Member]                                          
Regulatory Assets [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Percentage   4.00%                                      
Entergy New Orleans [Member]                                          
Regulatory Assets [Line Items]                                          
public utilities proposed customer credits                     $ 100                    
Regulatory asset related to costs associated with COVID-19 pandemic   $ 14,800,000           14,800,000           14,800,000              
Opportunity Sales Refund to be Redirected to Cares Program                                       $ 7,000,000  
Non-Securitized Storm Reserves Reallocated to Cares Program                                       $ 15,000,000  
Public Utilities, Property, Plant and Equipment, Construction Work in Progress   26,927,000   12,460,000       26,927,000           26,927,000 12,460,000            
Credits to customer bills resulting from City Council Cares Program   4,300,000           4,300,000           4,300,000              
Proceeds from the issuance of long-term debt               0 139,116,000                        
Storm Reserve Escrow Account   38,841,000   83,038,000       38,841,000           38,841,000 83,038,000            
Withdrawal from storm reserves   44,000,000                                      
Entergy New Orleans [Member] | Maximum [Member]                                          
Regulatory Assets [Line Items]                                          
public utilities proposed customer credits                     $ 400                    
Entergy New Orleans [Member] | Subsequent Event [Member] | Hurricane Zeta [Domain]                                          
Regulatory Assets [Line Items]                                          
Total Restoration Costs For Repair and Replacement of Electrical System 36,000,000                                        
Non-capital storm costs 8,000,000                                        
Deferred Storm and Property Reserve Deficiency, Noncurrent 28,000,000                                        
Entergy Texas [Member]                                          
Regulatory Assets [Line Items]                                          
Regulatory asset related to costs associated with COVID-19 pandemic   10,700,000           10,700,000           10,700,000              
Public Utilities, Property, Plant and Equipment, Construction Work in Progress   178,917,000   879,908,000       178,917,000           178,917,000 879,908,000            
Proceeds from the issuance of long-term debt               0 194,631,000                        
Entergy Texas [Member] | Hurricane Laura [Member]                                          
Regulatory Assets [Line Items]                                          
Interim fuel refund for cumulative over-recovery     $ 75,000,000                                    
Entergy Texas [Member] | Subsequent Event [Member] | Hurricanes Laura and Delta and Winter Storm Uri                                          
Regulatory Assets [Line Items]                                          
Total Restoration Costs For Repair and Replacement of Electrical System 250,000,000                                        
Non-capital storm costs 50,000,000                                        
Deferred Storm and Property Reserve Deficiency, Noncurrent $ 200,000,000                                        
Entergy Arkansas [Member]                                          
Regulatory Assets [Line Items]                                          
Energy Cost Recovery Rider Rate Per kWh                           0.01052              
Regulatory asset related to costs associated with COVID-19 pandemic   11,400,000           11,400,000           11,400,000              
Public Utilities, Property, Plant and Equipment, Construction Work in Progress   $ 288,269,000   234,213,000       288,269,000           288,269,000 234,213,000            
Proceeds from the issuance of long-term debt               604,760,000 264,505,000                        
Provision for rate refund       43,500,000                     43,500,000            
Public Utilities, Requested Return on Equity, Percentage   9.75%                                      
Entergy Arkansas [Member] | Subsequent Event [Member]                                          
Regulatory Assets [Line Items]                                          
Energy Cost Recovery Rider Rate Per kWh                         $ 0.00959                
Net change in required FRP rider revenue                   $ 39,800,000                      
Public Utilities, Requested Return on Equity, Percentage 9.65%                                        
System Energy [Member]                                          
Regulatory Assets [Line Items]                                          
Refund of Lease Payments                                         $ 17,200,000
Rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback   $ 422,000,000           422,000,000           422,000,000              
Interest Portion of rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback   115,000,000           115,000,000           115,000,000              
Refund related to depreciation expense adjustments   19,000,000           19,000,000           19,000,000              
Public Utilities, Property, Plant and Equipment, Construction Work in Progress   $ 73,360,000   59,831,000       73,360,000           73,360,000 $ 59,831,000            
Proceeds from the issuance of long-term debt               189,244,000 $ 243,559,000                        
Authorized return on common equity   10.94%                                      
FERC requested authorized return on equity for System Energy in return on equity proceeding, rebuttal   9.32%                                      
Percent Equity in Proposed Common Equity Ratio   48.15%                                      
Estimated refund related to FERC proceeding   $ 59,000,000           59,000,000           59,000,000              
Estimated annual rate reduction   46,000,000           46,000,000           46,000,000              
Provision related to FERC proceeding   36,000,000           $ 36,000,000           $ 36,000,000              
One-time accumulated deferred income tax credit       25,200,000                                  
Refund related to replacement energy costs   360,000,000                                      
Pre-authorization of capital improvement projects   $ 125,000,000                                      
Sale Leaseback Transaction, Net Book Value                                         $ 70,000,000
Grand Gulf [Member] | System Energy [Member]                                          
Regulatory Assets [Line Items]                                          
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage               11.50%                          
Distribution Cost Recovery Factor Rider [Member] | Entergy Texas [Member]                                          
Regulatory Assets [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount           $ 26,300,000                              
Revenue increase resulting from incremental revenue                       $ 6,800,000                  
Transmission Cost Recovery Factor Rider [Member] | Entergy Texas [Member]                                          
Regulatory Assets [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount           51,000,000                              
Revenue increase resulting from incremental revenue                               $ 31,600,000          
Generation Cost Recovery Rider | Entergy Texas [Member]                                          
Regulatory Assets [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 86,000,000   $ 91,000,000