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Risk Management and Fair Values (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
System Energy [Member] | Return on Equity and Capital Structure Complaints [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Return on equity complaint, estimated annual rate reduction $ 6.8   $ 6.8          
Financial 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 30.0 $ 32.0 30.0 $ 32.0 $ 48.0 $ 20.0 $ 40.0 $ 19.0
Issuance of Financial Transmission Rights     53.0 42.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset 15.0 40.0 90.0 67.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (33.0) (48.0) (133.0) (96.0)        
Financial 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 13.0 11.6 13.0 11.6 16.1 6.0 19.6 10.3
Issuance of Financial Transmission Rights     17.6 20.6        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings       (1.1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset 9.4 2.2 40.8          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (12.5) (10.2) (51.4) (18.2)        
Financial 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 11.6 14.7 11.6 14.7 19.8 9.8 16.7 7.3
Issuance of Financial Transmission Rights     21.6 18.1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings       36.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset 5.9 16.3 35.5          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (14.1) (18.3) (55.3) (46.7)        
Financial 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 (0.3) 1.1 (0.3) 1.1 3.6 1.3 1.2 0.6
Issuance of Financial Transmission Rights     3.9 1.4        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings       10.2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset (1.9) 6.5 (0.4)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (2.0) (6.6) (5.1) (11.1)        
Financial 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 2.0 1.3 2.0 1.3 2.6 1.1 1.5 0.8
Issuance of Financial Transmission Rights     2.8 1.4        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings       3.9        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset 0.6 2.2 3.7          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (1.2) (2.4) (5.6) (4.8)        
Financial 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 4.0 3.3 4.0 3.3 $ 6.6 $ 2.4   $ 0.1
Issuance of Financial Transmission Rights     7.2 0.2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings       17.5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset 0.8 12.5 9.9          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value             $ 1.2  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements $ (3.4) $ (10.4) $ (15.5) $ (14.5)