v3.26.1
Risk Management and Fair Values (Schedule of Derivatives Not Designated As Hedging Instruments) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financial transmission rights [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Letters of Credit Outstanding, Amount $ 6.0   $ 6.0   $ 2.0
Financial transmission rights [Member] | Not Designated as Hedging Instrument [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [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 Utilities Operating Expense, Purchased Power  
Derivative, Gain (Loss) on Derivative, Net $ 43.0 $ 66.0 $ 87.0 $ 114.0  
Derivative Asset, Subject to Master Netting Arrangement, before Offset $ 68.0   $ 68.0   $ 27.0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset $ (4.0)   $ (4.0)   $ 0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 64.0   $ 64.0   $ 27.0
Natural Gas Swaps | Not Designated as Hedging Instrument [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [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 Utilities Operating Expense, Fuel Used  
Derivative, Gain (Loss) on Derivative, Net $ (1.0) $ 11.0 $ 2.0 $ (1.0)  
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current   Other Liabilities, Current   Other Liabilities, Current
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset $ 0.0   $ 0.0   $ 0.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset 4.0   4.0   5.0
Derivative Liability, Subject to Master Netting Arrangement, before Offset $ 4.0   $ 4.0   5.0
Interest Rate Swap | Not Designated as Hedging Instrument [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Expense, Debt   Interest Expense, Debt    
Derivative, Gain (Loss) on Derivative, Net $ (5.0)   $ (9.0)    
Derivative Asset, Subject to Master Netting Arrangement, before Offset         $ 1.0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]         Prepaid Expense and Other Assets, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset         $ 0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset         $ 1.0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]         Deferred Credits and Other Liabilities
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset         $ 0.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset         3.0
Derivative Liability, Subject to Master Netting Arrangement, before Offset         3.0
Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Other Deferred Debits And Other Assets [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Derivative Asset, Subject to Master Netting Arrangement, before Offset $ 8.0   $ 8.0    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets, Noncurrent   Other Assets, Noncurrent    
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset $ 0.0   $ 0.0    
Derivative Asset, Subject to Master Netting Arrangement, after Offset 8.0   8.0    
Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Prepayments And Other [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Derivative Asset, Subject to Master Netting Arrangement, before Offset $ 1.0   $ 1.0    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current    
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset $ 0.0   $ 0.0    
Derivative Asset, Subject to Master Netting Arrangement, after Offset 1.0   1.0    
Entergy Arkansas [Member] | Financial transmission rights [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Letters of Credit Outstanding, Amount $ 1.4   $ 1.4   0.1
Entergy Arkansas [Member] | Financial transmission rights [Member] | Not Designated as Hedging Instrument [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [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 Utilities Operating Expense, Purchased Power  
Derivative, Gain (Loss) on Derivative, Net $ 8.9 $ 9.5 $ 17.4 $ 28.2  
Derivative Asset, Subject to Master Netting Arrangement, before Offset $ 23.8   $ 23.8   $ 5.5
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset $ 0.0   $ 0.0   $ 0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset 23.8   23.8   5.5
Entergy Louisiana [Member] | Uncommitted Credit Facility of $125 Million [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Letters of Credit Outstanding, Amount 111.1   111.1    
Entergy Louisiana [Member] | Financial transmission rights [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Letters of Credit Outstanding, Amount 1.3   1.3   0.8
Entergy Louisiana [Member] | Financial transmission rights [Member] | Uncommitted Credit Facility of $125 Million [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Letters of Credit Outstanding, Amount $ 1.3   $ 1.3    
Entergy Louisiana [Member] | Financial transmission rights [Member] | Not Designated as Hedging Instrument [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [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 Utilities Operating Expense, Purchased Power  
Derivative, Gain (Loss) on Derivative, Net $ 22.7 $ 42.0 $ 48.2 $ 64.1  
Derivative Asset, Subject to Master Netting Arrangement, before Offset $ 32.1   $ 32.1   $ 16.8
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset $ 0.0   $ 0.0   $ (0.1)
Derivative Asset, Subject to Master Netting Arrangement, after Offset 32.1   32.1   16.7
Entergy Mississippi [Member] | Financial transmission rights [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Letters of Credit Outstanding, Amount $ 2.5   $ 2.5   0.8
Entergy Mississippi [Member] | Financial transmission rights [Member] | Not Designated as Hedging Instrument [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [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 Utilities Operating Expense, Purchased Power  
Derivative, Gain (Loss) on Derivative, Net $ 3.4 $ 3.1 $ 11.9 $ 5.1  
Derivative Asset, Subject to Master Netting Arrangement, before Offset $ 0.9   $ 0.9   $ 0.4
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset $ 0.2   $ 0.2   $ 0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 0.7   $ 0.7   $ 0.4
Entergy Mississippi [Member] | Natural Gas Swaps | Not Designated as Hedging Instrument [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [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 Utilities Operating Expense, Fuel Used  
Derivative, Gain (Loss) on Derivative, Net $ (0.8) $ 11.4 $ 2.2 $ (1.2)  
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current   Other Liabilities, Current   Other Liabilities, Current
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset $ 0.0   $ 0.0   $ 0.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset 4.1   4.1   5.3
Derivative Liability, Subject to Master Netting Arrangement, before Offset $ (4.1)   $ (4.1)    
Entergy Mississippi [Member] | Natural Gas Swaps and Options [Member] | Not Designated as Hedging Instrument [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Derivative Liability, Subject to Master Netting Arrangement, before Offset         5.3
Entergy New Orleans [Member] | Financial transmission rights [Member] | Not Designated as Hedging Instrument [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [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 Utilities Operating Expense, Purchased Power  
Derivative, Gain (Loss) on Derivative, Net $ 2.4 $ 8.8 $ 1.3 $ 11.1  
Derivative Asset, Subject to Master Netting Arrangement, before Offset $ 4.0   $ 4.0   $ 1.8
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset $ 0.0   $ 0.0   $ 0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset 4.0   4.0   1.8
Entergy Texas [Member] | Financial transmission rights [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Letters of Credit Outstanding, Amount $ 0.6   $ 0.6   0.1
Entergy Texas [Member] | Financial transmission rights [Member] | Not Designated as Hedging Instrument [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [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 Utilities Operating Expense, Purchased Power  
Derivative, Gain (Loss) on Derivative, Net $ 5.1 $ 2.3 $ 7.8 $ 5.8  
Derivative Asset, Subject to Master Netting Arrangement, before Offset $ 6.9   $ 6.9   $ 2.3
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset $ (3.8)   $ (3.8)   $ (0.2)
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 3.1   $ 3.1   2.1
Entergy Texas [Member] | Interest Rate Swap | Not Designated as Hedging Instrument [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Expense, Debt   Interest Expense, Debt    
Derivative, Gain (Loss) on Derivative, Net $ (4.9)   $ (8.6)    
Derivative Asset, Subject to Master Netting Arrangement, before Offset         $ 0.5
Derivative Asset, Statement of Financial Position [Extensible Enumeration]         Prepaid Expense and Other Assets, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset         $ 0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset         $ 0.5
Entergy Texas [Member] | Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Other Deferred Debits And Other Assets [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Derivative Asset, Subject to Master Netting Arrangement, before Offset $ 7.5   $ 7.5    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets, Noncurrent   Other Assets, Noncurrent    
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset $ 0.0   $ 0.0    
Derivative Asset, Subject to Master Netting Arrangement, after Offset 7.5   7.5    
Entergy Texas [Member] | Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Prepayments And Other [Member]          
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]          
Derivative Asset, Subject to Master Netting Arrangement, before Offset $ 1.1   $ 1.1    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current   Prepaid Expense and Other Assets, Current    
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset $ 0.0   $ 0.0    
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 1.1   $ 1.1