Risk Management and Fair Values (Schedule of Derivatives Not Designated As Hedging Instruments) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Financial Transmission Rights (FTRs) [Member]
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]
Letters of Credit Outstanding, Amount	$ 0		$ 2,000,000
Financial transmission rights
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]
Letters of Credit Outstanding, Amount	$ 0
Financial transmission rights | 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
Derivative, Gain (Loss) on Derivative, Net	$ 49,000,000	$ 53,000,000
Derivative Asset, Current, 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		$ (1,000,000)
Derivative Asset, Subject to Master Netting Arrangement, after Offset	7,000,000		$ 20,000,000
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]			Other Liabilities, Current
Derivative Liability, Subject to Master Netting Arrangement, after Offset			$ 1,000,000
Financial transmission rights | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [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			0
Financial transmission rights | Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets
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	$ 7,000,000		$ 21,000,000
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
Derivative, Gain (Loss) on Derivative, Net	$ 11,000,000	$ (6,000,000)
Derivative Asset, Current, 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	$ 8,000,000		$ 2,000,000
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	0		0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	8,000,000		2,000,000
Entergy Arkansas [Member] | Uncommitted Credit Facility of $25 Million [Member]
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]
Letters of Credit Outstanding, Amount	17,100,000
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [Member]
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]
Letters of Credit Outstanding, Amount	$ 0		$ 500,000
Entergy Arkansas [Member] | Financial transmission rights | 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
Derivative, Gain (Loss) on Derivative, Net	$ 18,800,000	$ 26,900,000
Derivative Asset, Current, 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	$ 3,000,000.0		$ 8,600,000
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	0		(100,000)
Derivative Asset, Subject to Master Netting Arrangement, after Offset	3,000,000.0		8,500,000
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	56,200,000
Entergy Louisiana [Member] | Financial Transmission Rights (FTRs) [Member]
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]
Letters of Credit Outstanding, Amount	$ 0		$ 100,000
Entergy Louisiana [Member] | Financial transmission rights | 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
Derivative, Gain (Loss) on Derivative, Net	$ 22,000,000.0	$ 16,200,000
Derivative Asset, Current, 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	$ 3,400,000		$ 8,700,000
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	0		(100,000)
Derivative Asset, Subject to Master Netting Arrangement, after Offset	3,400,000		8,600,000
Entergy Mississippi [Member] | Uncommitted Credit Facility of $65 Million [Member]
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]
Letters of Credit Outstanding, Amount	32,600,000
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member]
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]
Letters of Credit Outstanding, Amount	$ 0		800,000
Entergy Mississippi [Member] | Financial transmission rights | 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
Derivative, Gain (Loss) on Derivative, Net	$ 2,000,000.0	$ 1,100,000
Derivative Asset, Subject to Master Netting Arrangement, before Offset	200,000		400,000
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	$ (300,000)		$ (900,000)
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current		Other Liabilities, Current
Derivative Liability, Subject to Master Netting Arrangement, after Offset	$ 100,000		$ 500,000
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
Derivative, Gain (Loss) on Derivative, Net	$ 11,400,000	$ 5,200,000
Derivative Asset, Current, 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	$ 8,400,000		$ 1,600,000
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	0		0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	8,400,000		1,600,000
Entergy New Orleans [Member] | Financial Transmission Rights (FTRs) [Member]
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]
Letters of Credit Outstanding, Amount	$ 0		$ 100,000
Entergy New Orleans [Member] | Financial transmission rights | 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
Derivative, Gain (Loss) on Derivative, Net	$ 2,200,000	$ 1,100,000
Derivative Asset, Current, 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	$ 400,000		$ 1,300,000
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	0		0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	400,000		1,300,000
Entergy New Orleans [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
Derivative, Gain (Loss) on Derivative, Net		$ 500,000
Entergy Texas [Member] | Uncommitted Credit Facility of $80 Million [Member]
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]
Letters of Credit Outstanding, Amount	105,400,000
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [Member]
Effect Of Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income [Line Items]
Letters of Credit Outstanding, Amount	$ 0		$ 300,000
Entergy Texas [Member] | Financial transmission rights | 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
Derivative, Gain (Loss) on Derivative, Net	$ 3,500,000	$ 7,500,000
Derivative Asset, Current, 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	$ 600,000		$ 2,000,000.0
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(200,000)		(100,000)
Derivative Asset, Subject to Master Netting Arrangement, after Offset	$ 400,000		$ 1,900,000