Risk Management and Fair Values (Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Natural Gas Swaps [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current, 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, Current, Statement of Financial Position [Extensible Enumeration]		Other Liabilities, Current
Derivative Liability, Subject to Master Netting Arrangement, before Offset		$ 11.0
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset		0.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset		11.0
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, 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		$ 21.0
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	$ (1.0)	0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	$ 20.0	$ 21.0
Derivative Liability, Current, 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
Entergy Louisiana [Member] \| Natural Gas Swaps [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]		Other Liabilities, Current
Derivative Liability, Subject to Master Netting Arrangement, before Offset		$ 0.4
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset		0.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset		0.4
Entergy Louisiana [Member] \| Financial Transmission Rights (FTRs) [Member]
Derivatives, Fair Value [Line Items]
Letters of Credit Outstanding, Amount	$ 0.1	$ 0.5
Entergy Louisiana [Member] \| Financial Transmission Rights (FTRs) [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
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	$ 8.7	$ 9.8
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(0.1)	0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	8.6	9.8
Entergy Arkansas [Member] \| Financial Transmission Rights (FTRs) [Member]
Derivatives, Fair Value [Line Items]
Letters of Credit Outstanding, Amount	$ 0.5	$ 1.2
Entergy Arkansas [Member] \| Financial Transmission Rights (FTRs) [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
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	$ 8.6	$ 6.0
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(0.1)	0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	$ 8.5	$ 6.0
Entergy Mississippi [Member] \| Natural Gas Swaps [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current, 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, Current, Statement of Financial Position [Extensible Enumeration]		Other Liabilities, Current
Derivative Liability, Subject to Master Netting Arrangement, before Offset		$ 10.1
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset		0.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset		10.1
Entergy Mississippi [Member] \| Financial Transmission Rights (FTRs) [Member]
Derivatives, Fair Value [Line Items]
Letters of Credit Outstanding, Amount	0.8	$ 0.3
Entergy Mississippi [Member] \| Financial Transmission Rights (FTRs) [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]		Prepaid Expense and Other Assets, Current
Derivative Asset, Subject to Master Netting Arrangement, before Offset	0.4	$ 1.4
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	$ (0.9)	0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset		$ 1.4
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current
Derivative Liability, Subject to Master Netting Arrangement, after Offset	$ 0.5
Entergy New Orleans [Member] \| Natural Gas Swaps [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]		Other Liabilities, Current
Derivative Liability, Subject to Master Netting Arrangement, before Offset		$ 0.6
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset		0.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset		$ 0.6
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, 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	$ 1.3	$ 1.1
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	0.0	0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	1.3	1.1
Entergy Texas [Member] \| Financial Transmission Rights (FTRs) [Member]
Derivatives, Fair Value [Line Items]
Letters of Credit Outstanding, Amount	$ 0.3	$ 0.1
Entergy Texas [Member] \| Financial Transmission Rights (FTRs) [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
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	$ 2.0	$ 2.7
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(0.1)	(0.3)
Derivative Asset, Subject to Master Netting Arrangement, after Offset	$ 1.9	$ 2.4

Fair value, after effect of master netting arrangement, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Includes derivative subject to master netting arrangement not elected or qualified to offset. Excludes derivative not subject to master netting arrangement or similar agreement.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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