Risk Management and Fair Values (Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 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	$ 30.0	$ 30.0	$ 30.0	$ 30.0	$ 48.0	$ 20.0	$ 48.0	$ 20.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	18.0	15.0	111.0	90.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(36.0)	(33.0)	(150.0)	(133.0)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances			49.0	53.0
Financial transmission rights
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	4.0		4.0			$ 2.0
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	(31.0)		(31.0)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]						Other Liabilities, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	1.0		1.0			$ 1.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset						1.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	$ 30.0		$ 30.0			$ 20.0
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
Natural Gas Swaps | 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						$ (2.0)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current		Other Liabilities, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset						0.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset	$ 5.0		$ 5.0
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
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						$ 0.0
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						(21.0)
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	18.4	11.6	18.4	11.6	28.3	8.6	19.8	9.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	6.1	5.9	61.1	35.5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(16.0)	(14.1)	(80.0)	(55.3)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances			28.7	21.6
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	117.0		117.0
Entergy Louisiana [Member] | Financial Transmission Rights (FTRs) [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	0.5		0.5
Entergy Louisiana [Member] | Financial transmission rights
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	0.5		0.5			0.1
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	(18.6)		(18.6)			(8.7)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	0.2		0.2			0.1
Derivative Asset, Subject to Master Netting Arrangement, after Offset	$ 18.4		$ 18.4			$ 8.6
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
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	$ 0.4	(0.3)	$ 0.4	(0.3)	1.4	$ (0.5)	3.6	1.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	3.2	(1.9)	8.7	(0.4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(4.2)	(2.0)	(9.3)	(5.1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances			1.5	3.9
Entergy Mississippi [Member] | Financial transmission rights
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	1.2		1.2			0.8
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	(0.4)		(0.4)			$ (0.4)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]						Other Liabilities, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	0.0		0.0			$ 0.9
Derivative Liability, Subject to Master Netting Arrangement, after Offset						0.5
Derivative Asset, Subject to Master Netting Arrangement, after Offset	$ 0.4		$ 0.4
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current		Prepaid Expense and Other Assets, Current
Entergy Mississippi [Member] | Natural Gas Swaps | 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						(1.6)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current		Other Liabilities, Current
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset						0.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset	$ 4.9		$ 4.9
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
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	2.2	2.0	2.2	2.0	3.0	$ 1.3	2.6	1.1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	0.9	0.6	10.8	3.7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(1.7)	(1.2)	(12.8)	(5.6)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances			2.9	2.8
Entergy New Orleans [Member] | Financial transmission rights
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount						0.1
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	(2.2)		(2.2)			(1.3)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	0.0		0.0			0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	$ 2.2		$ 2.2			$ 1.3
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
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	$ 8.0	13.0	$ 8.0	13.0	11.1	$ 8.6	16.1	6.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	6.6	9.4	25.5	40.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(9.7)	(12.5)	(37.9)	(51.4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances			11.8	17.6
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	19.8		19.8
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [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	2.1		2.1
Entergy Arkansas [Member] | Financial transmission rights
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	2.1		2.1			0.5
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	(8.0)		(8.0)			(8.6)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	0.0		0.0			0.1
Derivative Asset, Subject to Master Netting Arrangement, after Offset	$ 8.0		$ 8.0			$ 8.5
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
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	$ 1.4	4.0	$ 1.4	4.0	$ 3.9	$ 1.9	$ 6.6	$ 2.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset	1.4	0.8	5.3	9.9
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(3.9)	$ (3.4)	(9.8)	(15.5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances			4.0	$ 7.2
Entergy Texas [Member] | Financial transmission rights
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount						0.3
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	(2.0)		(2.0)			(2.0)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	0.6		0.6			0.1
Derivative Asset, Subject to Master Netting Arrangement, after Offset	$ 1.4		$ 1.4			$ 1.9
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