Risk Management and Fair Values (Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 7,000,000	$ 9,000,000	$ 20,000,000	$ 21,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	36,000,000	41,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(49,000,000)	(53,000,000)
Financial Transmission Rights (FTRs) [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	0		$ 2,000,000
Financial transmission rights
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	0
Financial transmission rights | Not Designated as Hedging Instrument [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]			Other Liabilities, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	$ 0		$ 1,000,000
Derivative Liability, Subject to Master Netting Arrangement, after Offset			$ 1,000,000
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, after Offset	$ 7,000,000		$ 20,000,000
Other Current Liabilities [Member] | Financial transmission rights | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset			0
Prepaid Expenses and Other Current Assets | Financial transmission rights | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	(7,000,000)		(21,000,000)
Entergy Louisiana [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	3,400,000	4,100,000	8,600,000	9,800,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	16,800,000	10,500,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(22,000,000.0)	(16,200,000)
Entergy Louisiana [Member] | Uncommitted Credit Facility of $125 Million [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	56,200,000
Entergy Louisiana [Member] | Financial Transmission Rights (FTRs) [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	0		100,000
Entergy Louisiana [Member] | Financial transmission rights | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	(3,400,000)		(8,700,000)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	$ 0		$ 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, after Offset	$ 3,400,000		$ 8,600,000
Entergy Mississippi [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		600,000		1,400,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	2,400,000	300,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(2,000,000.0)	(1,100,000)
Entergy Mississippi [Member] | Uncommitted Credit Facility of $65 Million [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	32,600,000
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	0		800,000
Entergy Mississippi [Member] | Financial transmission rights | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	$ (200,000)		$ (400,000)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current		Other Liabilities, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	$ 300,000		$ 900,000
Derivative Liability, Subject to Master Netting Arrangement, after Offset	100,000		500,000
Entergy New Orleans [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	400,000	500,000	1,300,000	1,100,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	1,300,000	500,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(2,200,000)	(1,100,000)
Entergy New Orleans [Member] | Financial Transmission Rights (FTRs) [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	0		100,000
Entergy New Orleans [Member] | Financial transmission rights | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	(400,000)		(1,300,000)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	$ 0		$ 0
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, after Offset	$ 400,000		$ 1,300,000
Entergy Arkansas [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	3,000,000.0	2,800,000	8,600,000	6,000,000.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	13,200,000	23,700,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(18,800,000)	(26,900,000)
Entergy Arkansas [Member] | Uncommitted Credit Facility of $25 Million [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	17,100,000
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	0		500,000
Entergy Arkansas [Member] | Financial transmission rights | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	(3,000,000.0)		(8,600,000)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	$ 0		$ 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, after Offset	$ 3,000,000.0		$ 8,500,000
Entergy Texas [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	400,000	1,200,000	1,900,000	$ 2,400,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	2,000,000.0	6,300,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(3,500,000)	$ (7,500,000)
Entergy Texas [Member] | Uncommitted Credit Facility of $80 Million [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	105,400,000
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	0		300,000
Entergy Texas [Member] | Financial transmission rights | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	(600,000)		(2,000,000.0)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	$ 200,000		$ 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, after Offset	$ 400,000		$ 1,900,000