Risk Management and Fair Values Fair Values Of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Collateral Already Posted, Aggregate Fair Value		$ 8.0
Utility [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Letters of Credit Outstanding, Amount	$ 2.0	3.0
Prepayments And Other [Member] | Natural Gas Swaps [Member] | Utility [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		13.0
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset		$ 0.0
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Prepaid Expense and Other Assets, Current
Prepayments And Other [Member] | Financial Transmission Rights (FTRs) [Member] | Utility [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	21.0	$ 21.0
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	$ 0.0	$ (2.0)
Derivative Liability, 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
Other Deferred Debits And Other Assets [Member] | Natural Gas Swaps [Member] | Utility [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		$ 3.0
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset		$ 0.0
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets, Noncurrent
Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Utility [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	$ 11.0	$ 25.0
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	0.0	0.0
Derivative Liability, Subject to Master Netting Arrangement, before Offset	$ 11.0	$ 25.0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Entergy Louisiana [Member] | Natural Gas Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Prepaid Expense and Other Assets, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Other Assets, Noncurrent
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] | Not Designated as Hedging Instrument [Member]
Derivative Liability, 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] | Natural Gas Swaps [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		$ 13.1
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset		0.0
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	$ 9.8	7.7
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	0.0	(0.4)
Entergy Louisiana [Member] | Other Deferred Debits And Other Assets [Member] | Natural Gas Swaps [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		3.4
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset		$ 0.0
Entergy Louisiana [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [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
Derivative Liability, Subject to Master Netting Arrangement, before Offset	0.4
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
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability, 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	$ 6.0	$ 10.3
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	$ 0.0	$ 0.0
Entergy Mississippi [Member] | Natural Gas Swaps [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	$ 0.2
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability, 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	$ 1.4	$ 0.6
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 [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	10.1	24.0
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	0.0	0.0
Derivative Liability, Subject to Master Netting Arrangement, before Offset	$ 10.1	$ 24.0
Entergy New Orleans [Member] | Natural Gas Swaps [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 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		$ 0.2
Entergy New Orleans [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability, 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	$ 1.1	$ 0.8
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 [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	1.5
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	0.0	0.0
Derivative Liability, Subject to Master Netting Arrangement, before Offset	0.6	1.5
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	$ 2.4
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Liability, 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	$ 2.7	$ 1.2
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset	$ 0.3	$ 1.1