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Risk Management and Fair Values (Reconciliation Of Changes In The Net Assets (Liabilities) For The Fair Value Of Derivatives Classified As Level 3 In The Fair Value Hierarchy) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Electricity Swaps And Options [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   $ 0.0   $ 0.0       $ 38.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)       2.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset       0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements       38.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       (2.0)        
Issuance of Financial Transmission Rights       0.0        
Fixed Transmission Rights (FTRs) [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 12.0 15.0 $ 12.0 15.0 $ 1.0 $ 4.0 $ 4.0 9.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings     0.0 3.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)     0.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset 32.0 15.0 52.0 135.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 37.0 16.0 60.0 144.0        
Issuance of Financial Transmission Rights 16.0 12.0 16.0 12.0        
Fixed Transmission Rights (FTRs) [Member] | Entergy Arkansas [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 4.4 3.8 4.4 3.8 0.4 2.3 1.4 2.7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 14.6 3.0   27.8        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset     20.2          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 16.0 3.4 23.5 29.5        
Issuance of Financial Transmission Rights 5.4 2.8 5.4 2.8        
Fixed Transmission Rights (FTRs) [Member] | Entergy Louisiana [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 4.7 4.8 4.7 4.8 0.3 0.6 1.2 4.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 15.2 5.4   14.7        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset     24.3          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 16.1 5.9 25.5 18.2        
Issuance of Financial Transmission Rights 5.3 4.1 5.3 4.1        
Fixed Transmission Rights (FTRs) [Member] | Entergy Mississippi [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0.5 2.1 0.5 2.1 0.2 0.3 0.3 0.6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1.7 0.8   7.7        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset     2.6          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (2.2) (0.7) (3.2) (7.9)        
Issuance of Financial Transmission Rights 0.8 1.7 0.8 1.7        
Fixed Transmission Rights (FTRs) [Member] | Entergy New Orleans [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0.6 0.6 0.6 0.6 0.1 0.1 0.1 0.1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1.3 0.9   2.1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset     2.1          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (1.6) (0.8) (2.4) (2.0)        
Issuance of Financial Transmission Rights 0.8 0.4 0.8 0.4        
Fixed Transmission Rights (FTRs) [Member] | Entergy Texas [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1.5 3.8 1.5 3.8 $ 0.5 $ 0.8 $ 0.5 $ 1.6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (1.9) 5.4   82.2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset     1.7          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 1.0 4.8 4.9 82.7        
Issuance of Financial Transmission Rights $ 3.9 $ 2.7 $ 3.9 $ 2.7