Risk Management and Fair Values (Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	$ 3.0		$ 3.0		$ 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		Other Liabilities, Current
Financial Transmission Rights (FTRs) [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Issuance of Financial Transmission Rights	$ 53.0	$ 42.0	$ 53.0	$ 42.0
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		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	$ 49.0		$ 49.0		$ 21.0
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	0.0		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	2.0		2.0		11.0
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	0.0		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	20.7		20.7
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
Issuance of Financial Transmission Rights	21.6	18.1	21.6	18.1
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	$ 0.7		$ 0.7
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		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	$ 19.9		$ 19.9		$ 9.8
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	0.1		0.1		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	$ 41.1		$ 41.1
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		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
Issuance of Financial Transmission Rights	$ 3.9	1.4	$ 3.9	1.4
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	$ 0.6		$ 0.6
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		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	$ 3.6		$ 3.6		$ 1.4
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	0.0		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	1.5		1.5		10.1
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	0.0		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]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Issuance of Financial Transmission Rights	$ 2.8	1.4	$ 2.8	1.4
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		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	$ 2.6		$ 2.6		$ 1.1
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	0.0		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	12.4		12.4
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
Issuance of Financial Transmission Rights	17.6	20.6	17.6	20.6
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	$ 1.0		$ 1.0
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		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	$ 16.1		$ 16.1		$ 6.0
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	0.0		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	79.7		79.7
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
Issuance of Financial Transmission Rights	7.3	$ 0.2	7.3	$ 0.2
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	$ 0.4		$ 0.4
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		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	$ 6.6		$ 6.6		$ 2.7
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	$ 0.0		$ 0.0		$ 0.3