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Risk Management and Fair Values (Derivatives Not Designated as Hedging Instruments) (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financial Transmission Rights (FTRs) [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power
Derivative, Gain (Loss) on Derivative, Net $ 195.0 $ 164.0 $ 124.0
Derivative Asset, Subject to Master Netting Arrangement, before Offset 27.0    
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset 0.0 (1.0)  
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 27.0 $ 20.0  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current  
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other Liabilities, Current  
Derivative Liability, Subject to Master Netting Arrangement, after Offset   $ 1.0  
Financial Transmission Rights (FTRs) [Member] | Prepaid Expenses and Other Current Assets [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Asset, Subject to Master Netting Arrangement, before Offset   21.0  
Financial Transmission Rights (FTRs) [Member] | Other Current Liabilities [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Asset, Subject to Master Netting Arrangement, before Offset   $ 0.0  
Natural Gas Swaps [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Utilities Operating Expense, Fuel Used
Derivative, Gain (Loss) on Derivative, Net     $ (54.0)
Natural gas swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Utilities Operating Expense, Fuel Used Utilities Operating Expense, Fuel Used  
Derivative, Gain (Loss) on Derivative, Net $ (8.0) $ (8.0)  
Derivative Asset, Subject to Master Netting Arrangement, before Offset   2.0  
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset   0.0  
Derivative Asset, Subject to Master Netting Arrangement, after Offset   $ 2.0  
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Prepaid Expense and Other Assets, Current  
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current    
Derivative Liability, Subject to Master Netting Arrangement, after Offset $ 5.0    
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset 0.0    
Derivative Liability, Subject to Master Netting Arrangement, before Offset $ 5.0    
Interest Rate Swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Expense, Debt    
Derivative, Gain (Loss) on Derivative, Net $ (2.0)    
Derivative Asset, Subject to Master Netting Arrangement, before Offset 1.0    
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset 0.0    
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 1.0    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Deferred Credits and Other Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset $ 3.0    
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset 0.0    
Derivative Liability, Subject to Master Netting Arrangement, before Offset $ 3.0    
Entergy Louisiana [Member] | Financial Transmission Rights (FTRs) [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power
Derivative, Gain (Loss) on Derivative, Net $ 101.0 $ 71.7 $ 60.4
Derivative Asset, Subject to Master Netting Arrangement, before Offset 16.8 8.7  
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset (0.1) (0.1)  
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 16.7 $ 8.6  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current  
Entergy Louisiana [Member] | Natural Gas Swaps [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Utilities Operating Expense, Fuel Used
Derivative, Gain (Loss) on Derivative, Net     $ (8.4)
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power
Derivative, Gain (Loss) on Derivative, Net $ 11.5 $ 7.5 $ 13.7
Derivative Asset, Subject to Master Netting Arrangement, before Offset 0.4 0.4  
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset 0.0 $ (0.9)  
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 0.4    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current    
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other Liabilities, Current  
Derivative Liability, Subject to Master Netting Arrangement, after Offset   $ 0.5  
Entergy Mississippi [Member] | Natural gas swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Utilities Operating Expense, Fuel Used Utilities Operating Expense, Fuel Used Utilities Operating Expense, Fuel Used
Derivative, Gain (Loss) on Derivative, Net $ (8.4) $ (7.0) $ (42.9)
Derivative Asset, Subject to Master Netting Arrangement, before Offset   1.6  
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset   0.0  
Derivative Asset, Subject to Master Netting Arrangement, after Offset   $ 1.6  
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Prepaid Expense and Other Assets, Current  
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current    
Derivative Liability, Subject to Master Netting Arrangement, after Offset $ 5.3    
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset 0.0    
Derivative Liability, Subject to Master Netting Arrangement, before Offset $ 5.3    
Entergy New Orleans [Member] | Financial Transmission Rights (FTRs) [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power
Derivative, Gain (Loss) on Derivative, Net $ 15.0 $ 6.9 $ 6.4
Derivative Asset, Subject to Master Netting Arrangement, before Offset 1.8 1.3  
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset 0.0 0.0  
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 1.8 $ 1.3  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current  
Entergy New Orleans [Member] | Natural gas swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Utilities Operating Expense, Fuel Used Utilities Operating Expense, Fuel Used
Derivative, Gain (Loss) on Derivative, Net   $ (0.5) $ (3.0)
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power
Derivative, Gain (Loss) on Derivative, Net $ 51.3 $ 59.8 $ 25.8
Derivative Asset, Subject to Master Netting Arrangement, before Offset 5.5 8.6  
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset 0.0 (0.1)  
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 5.5 $ 8.5  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current  
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power Utilities Operating Expense, Purchased Power
Derivative, Gain (Loss) on Derivative, Net $ 15.8 $ 17.8 $ 17.3
Derivative Asset, Subject to Master Netting Arrangement, before Offset 2.3 2.0  
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset (0.2) (0.1)  
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 2.1 $ 1.9  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current  
Entergy Texas [Member] | Interest Rate Swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Expense, Debt    
Derivative, Gain (Loss) on Derivative, Net $ (2.5)    
Derivative Asset, Subject to Master Netting Arrangement, before Offset 0.5    
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset 0.0    
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 0.5    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Deferred Credits and Other Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset $ (3.0)    
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset 0.0    
Derivative Liability, Subject to Master Netting Arrangement, before Offset $ (3.0)