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Risk Management and Fair Values (Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Financial Transmission Rights (FTRs) [Member]    
Derivatives, Fair Value [Line Items]    
Letters of Credit Outstanding, Amount $ 2.0 $ 2.0
Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
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, 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 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] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, before Offset   0.0
Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, before Offset   $ 21.0
Natural gas swaps | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Prepaid Expense and Other Assets, Current
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 Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current  
Derivative Liability, Subject to Master Netting Arrangement, before Offset $ 5.0  
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset 0.0  
Derivative Liability, Subject to Master Netting Arrangement, after Offset $ 5.0  
Interest Rate Swap | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current  
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 Liability, Statement of Financial Position [Extensible Enumeration] Deferred Credits and Other Liabilities  
Derivative Liability, Subject to Master Netting Arrangement, before Offset $ 3.0  
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset 0.0  
Derivative Liability, Subject to Master Netting Arrangement, after Offset 3.0  
Entergy Louisiana [Member] | Financial Transmission Rights (FTRs) [Member]    
Derivatives, Fair Value [Line Items]    
Letters of Credit Outstanding, Amount $ 0.8 $ 0.1
Entergy Louisiana [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
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, 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
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [Member]    
Derivatives, Fair Value [Line Items]    
Letters of Credit Outstanding, Amount $ 0.1 $ 0.5
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
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, 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
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member]    
Derivatives, Fair Value [Line Items]    
Letters of Credit Outstanding, Amount $ 0.8 0.8
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current  
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 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 | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Prepaid Expense and Other Assets, Current
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 Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current  
Derivative Liability, Subject to Master Netting Arrangement, before Offset $ 5.3  
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset 0.0  
Derivative Liability, Subject to Master Netting Arrangement, after Offset $ 5.3  
Entergy New Orleans [Member] | Financial Transmission Rights (FTRs) [Member]    
Derivatives, Fair Value [Line Items]    
Letters of Credit Outstanding, Amount   $ 0.1
Entergy New Orleans [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
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, 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
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [Member]    
Derivatives, Fair Value [Line Items]    
Letters of Credit Outstanding, Amount $ 0.1 $ 0.3
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
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, 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
Entergy Texas [Member] | Interest Rate Swap | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current  
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 Liability, Statement of Financial Position [Extensible Enumeration] Deferred Credits and Other Liabilities  
Derivative Liability, Subject to Master Netting Arrangement, before Offset $ (3.0)  
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset 0.0  
Derivative Liability, Subject to Master Netting Arrangement, after Offset $ (3.0)