Risk Management and Fair Values (Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	$ 2.0	$ 2.0
Natural Gas Swaps and Options [Member] | Not Designated as Hedging Instrument [Member]
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
Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Prepayments And Other [Member] | Financial Transmission Rights (FTRs) [Member] | 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	$ 9.0	$ 21.0
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	0.0	0.0
Other Current Liabilities [Member] | Natural Gas Swaps and Options [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	6.0	11.0
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	0.0	$ 0.0
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	11.8
Entergy Louisiana [Member] | Natural Gas Swaps and Options [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other Liabilities, Current
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		$ 0.5
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
Entergy Louisiana [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Entergy Louisiana [Member] | Prepayments And Other [Member] | Financial Transmission Rights (FTRs) [Member] | 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	$ 4.1	$ 9.8
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	0.0	0.0
Entergy Louisiana [Member] | Other Current Liabilities [Member] | Natural Gas Swaps and Options [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset		0.4
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset		$ 0.0
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	$ 27.6
Entergy Mississippi [Member] | Natural Gas Swaps and Options [Member] | Not Designated as Hedging Instrument [Member]
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
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		$ 0.3
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [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	$ 0.5
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Entergy Mississippi [Member] | Prepayments And Other [Member] | Financial Transmission Rights (FTRs) [Member] | 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	$ 0.6	$ 1.4
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	0.0	0.0
Entergy Mississippi [Member] | Other Current Liabilities [Member] | Natural Gas Swaps and Options [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	6.5	10.1
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	$ 0.0	$ 0.0
Entergy New Orleans [Member] | Natural Gas Swaps and Options [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other Liabilities, Current
Entergy New Orleans [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Entergy New Orleans [Member] | Prepayments And Other [Member] | Financial Transmission Rights (FTRs) [Member] | 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	$ 0.5	$ 1.1
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	0.0	0.0
Entergy New Orleans [Member] | Other Current Liabilities [Member] | Natural Gas Swaps and Options [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset		0.6
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset		0.0
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	2.1
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		$ 1.2
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	$ 0.6
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Entergy Arkansas [Member] | Prepayments And Other [Member] | Financial Transmission Rights (FTRs) [Member] | 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	$ 2.8	$ 6.0
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	0.0	0.0
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	76.5
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		$ 0.1
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [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	$ 0.2
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Entergy Texas [Member] | Prepayments And Other [Member] | Financial Transmission Rights (FTRs) [Member] | 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	$ 1.2	$ 2.7
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	$ 0.0	$ 0.3