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Risk Management and Fair Values (Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location) (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 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 | $ 7,000,000 | $ 9,000,000 | $ 20,000,000 | $ 21,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset | 36,000,000 | 41,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (49,000,000) | (53,000,000) |  |
Financial Transmission Rights (FTRs) [Member] |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] |  |  |  |
Letters of Credit Outstanding, Amount | 0 |  | $ 2,000,000 |
Financial transmission rights |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] |  |  |  |
Letters of Credit Outstanding, Amount | 0 |  |  |
Financial transmission rights | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] |  |  |  |
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] |  |  | Other Liabilities, Current |
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | $ 0 |  | $ 1,000,000 |
Derivative Liability, Subject to Master Netting Arrangement, after Offset |  |  | $ 1,000,000 |
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, after Offset | $ 7,000,000 |  | $ 20,000,000 |
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 |
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 | (7,000,000) |  | (21,000,000) |
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 | 3,400,000 | 4,100,000 | 8,600,000 | 9,800,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset | 16,800,000 | 10,500,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (22,000,000.0) | (16,200,000) |  |
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 | 56,200,000 |  |  |
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 |  | 100,000 |
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 | (3,400,000) |  | (8,700,000) |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | $ 0 |  | $ 100,000 |
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, after Offset | $ 3,400,000 |  | $ 8,600,000 |
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 |  | 600,000 |  | 1,400,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset | 2,400,000 | 300,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (2,000,000.0) | (1,100,000) |  |
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 | 32,600,000 |  |  |
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 |  | 800,000 |
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 | $ (200,000) |  | $ (400,000) |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] |  |  |  |
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Current |  | Other Liabilities, Current |
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | $ 300,000 |  | $ 900,000 |
Derivative Liability, Subject to Master Netting Arrangement, after Offset | 100,000 |  | 500,000 |
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 | 400,000 | 500,000 | 1,300,000 | 1,100,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset | 1,300,000 | 500,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (2,200,000) | (1,100,000) |  |
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 |  | 100,000 |
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 | (400,000) |  | (1,300,000) |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | $ 0 |  | $ 0 |
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, after Offset | $ 400,000 |  | $ 1,300,000 |
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 | 3,000,000.0 | 2,800,000 | 8,600,000 | 6,000,000.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset | 13,200,000 | 23,700,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (18,800,000) | (26,900,000) |  |
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 | 17,100,000 |  |  |
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 | 0 |  | 500,000 |
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 | (3,000,000.0) |  | (8,600,000) |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | $ 0 |  | $ 100,000 |
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, after Offset | $ 3,000,000.0 |  | $ 8,500,000 |
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 | 400,000 | 1,200,000 | 1,900,000 | $ 2,400,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included as Regulatory Liability/Asset | 2,000,000.0 | 6,300,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (3,500,000) | $ (7,500,000) |  |
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 | 105,400,000 |  |  |
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 |  | 300,000 |
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 | (600,000) |  | (2,000,000.0) |
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | $ 200,000 |  | $ 100,000 |
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, after Offset | $ 400,000 |  | $ 1,900,000 |

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