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Risk Management and Fair Values (Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset $ 153.0 $ 110.0 $ 84.0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (195.0) (164.0) (124.0)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 27.0 20.0 21.0 $ 19.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances 49.0 53.0 42.0  
Entergy Arkansas [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset 36.5 44.7    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (51.3) (59.8)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 5.5 8.5 6.0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances 11.8 17.6    
Entergy Louisiana [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset 80.4 48.9    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (101.0) (71.7)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 16.7 8.6 9.8  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances 28.7 21.6    
Entergy Mississippi [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset 10.9 1.7    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (11.5) (7.5)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0.4 (0.5) 1.4  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances 1.5 3.9    
Entergy New Orleans [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset 12.6 4.3    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (15.0) (6.9)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1.8 1.3 1.1  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances 2.9 2.8    
Entergy Texas [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset 12.0 10.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (15.8) (17.8)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 2.1 1.9 $ 2.4  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances $ 4.0 $ 7.3