RATE AND REGULATORY MATTERS (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Details)	1 Months Ended																		6 Months Ended	9 Months Ended		12 Months Ended
	Oct. 31, 2026 USD ($) MW	Sep. 30, 2026 USD ($)	Aug. 31, 2026 USD ($)	Jul. 31, 2026 USD ($)	Jun. 30, 2026 USD ($) MW	May 31, 2026 USD ($)	Apr. 30, 2026 USD ($)	Mar. 31, 2026 USD ($)	Feb. 28, 2026 USD ($)	Jan. 31, 2026 USD ($)	Nov. 30, 2025	Oct. 31, 2025 USD ($)	Sep. 30, 2025 USD ($) $ / kWh MW	Jul. 31, 2025 USD ($)	Jan. 31, 2025 USD ($)	Nov. 30, 2024 USD ($)	Apr. 30, 2024 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($) MW	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Public Utilities, General Disclosures [Line Items]
Requested deferred fuel costs																				$ 164,173,000	$ 189,958,000
Other regulatory liabilities		$ 3,898,506,000																	$ 3,898,506,000	3,898,506,000			$ 3,911,839,000
ENTERGY ARKANSAS, LLC
Public Utilities, General Disclosures [Line Items]
Requested deferred fuel costs																				137,909,000	49,533,000
Other regulatory liabilities		1,054,729,000																	1,054,729,000	1,054,729,000			1,044,060,000
ENTERGY LOUISIANA, LLC
Public Utilities, General Disclosures [Line Items]
Requested deferred fuel costs																				(37,868,000)	(7,455,000)
Other regulatory liabilities		1,560,954,000																	1,560,954,000	1,560,954,000			1,630,763,000
ENTERGY LOUISIANA, LLC | Winter Storm Fern
Public Utilities, General Disclosures [Line Items]
Requested deferred fuel costs										$ 141,900,000
Deferred cost period										4 months
ENTERGY TEXAS, INC.
Public Utilities, General Disclosures [Line Items]
Requested deferred fuel costs																				39,500,000	48,081,000
Other regulatory liabilities		182,711,000																	182,711,000	182,711,000			138,969,000
ENTERGY TEXAS, INC. | Public Utility, Commission Of Texas
Public Utilities, General Disclosures [Line Items]
Fuel and purchased power expenses		1,200,000,000
Cumulative over-recovery balance		90,100,000
ENTERGY MISSISSIPPI, LLC
Public Utilities, General Disclosures [Line Items]
Requested deferred fuel costs																				22,789,000	103,852,000
Other regulatory liabilities		164,701,000																	164,701,000	164,701,000			144,124,000
ENTERGY MISSISSIPPI, LLC | Winter Storm Fern | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Securitization amount requested	$ 237,800,000
Non-fuel system restoration costs	145,700,000
Incremental fuel restoration costs	65,000,000.0
Retired amount	7,600,000
Estimated carrying costs	14,300,000
Estimated issuance and financing costs	5,200,000
ENTERGY NEW ORLEANS, LLC
Public Utilities, General Disclosures [Line Items]
Requested deferred fuel costs																				1,844,000	$ (4,053,000)
Other regulatory liabilities		301,477,000																	301,477,000	301,477,000			312,962,000
Energy Cost Recovery Rider | ENTERGY ARKANSAS, LLC
Public Utilities, General Disclosures [Line Items]
Energy cost recovery riser per kWh (in dollars per kWh)							$ 0.01508															$ 0.01333
Requested energy cost recovery rider per kWh (in dollars per kWh)																			0.01508
Capacity Cost Recovery Rider | ENTERGY TEXAS, INC.
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider						$ 58,000,000
Frontier Power Purchase Agreement | ENTERGY TEXAS, INC.
Public Utilities, General Disclosures [Line Items]
Long-term power purchase agreement					14 years
Estimated costs					$ 883,000,000
Frontier Power Purchase Agreement | ENTERGY TEXAS, INC. | Capacity And Energy
Public Utilities, General Disclosures [Line Items]
Generation capacity commitment | MW					300
Frontier Power Purchase Agreement | ENTERGY TEXAS, INC. | Natural Gas Fired Combined Cycle Combustion Turbine Plant
Public Utilities, General Disclosures [Line Items]
Generation capacity commitment | MW					830
2026 Base Rate Case | ENTERGY ARKANSAS, LLC
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider									$ 44,600,000
Requested return on common equity									9.90%
Proposed rate revenue adjustment		(28,600,000)
2026 Base Rate Case | ENTERGY ARKANSAS, LLC | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider	(28,900,000)
Proposed conditional rate adjustment	$ 0
Proposed return on equity percentage	9.70%
Proposed equity percentage	47.50%
Proposed debt percentage	52.50%
2026 Formula Rate Plan Filing | ENTERGY ARKANSAS, LLC
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider																							$ (8,800,000)
Requested return on common equity																							9.65%
Earned rate of return on common equity																							8.80%
Formula rate plan revenue adjustment																							$ 47,200,000
Formula rate plan revenues																							56,000,000.0
Annual revenue constraint percentage				4.00%
2026 Formula Rate Plan Filing | ENTERGY ARKANSAS, LLC | Formula rate plan historical year rate adjustment
Public Utilities, General Disclosures [Line Items]
Other regulatory liabilities					$ 8,800,000
2026 Formula Rate Plan Filing | ENTERGY MISSISSIPPI, LLC
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider					$ 0				$ 0														$ 0
Requested return on common equity									7.64%
Interim rate adjustment									$ 293,000
Earned return on rate base					7.68%																		8.10%
2026 Formula Rate Plan Filing | ENTERGY NEW ORLEANS, LLC
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider							$ 16,600,000
Approved return on equity							9.35%
Earned return on equity							7.55%
Review and discovery period							75 days
Dispute resolution period							25 days
Recommended reduction to requested rate increase				$ 4,400,000
Proposed surcharge recovery amount		$ 20,000,000		$ 20,000,000															$ 20,000,000	$ 20,000,000
Proposed amortization period		5 years		5 years															5 years	5 years
Approved surcharge recovery amount		$ 10,000,000																	$ 10,000,000	$ 10,000,000
Revenue adjustment		13,800,000
2026 Formula Rate Plan Filing | ENTERGY NEW ORLEANS, LLC | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Approved collection for year one	$ 2,300,000
Generating Arkansas Jobs Act Rider | ENTERGY ARKANSAS, LLC
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider								$ 110,400,000
Production Tax Credit Tariffs | ENTERGY ARKANSAS, LLC
Public Utilities, General Disclosures [Line Items]
Tax credit generation period								10 years
Proposed amortization period							15 years
Production Tax Credit Tariffs | ENTERGY ARKANSAS, LLC | Solar Facility
Public Utilities, General Disclosures [Line Items]
Useful life								30 years														30 years
Arkansas Cypress Solar | ENTERGY ARKANSAS, LLC | Solar photovoltaic array
Public Utilities, General Disclosures [Line Items]
Generation capacity | MW													600								600
Arkansas Cypress Solar | ENTERGY ARKANSAS, LLC | Battery energy storage system
Public Utilities, General Disclosures [Line Items]
Generation capacity | MW													350								350
Arkansas Cypress Solar | ENTERGY ARKANSAS, LLC | Battery energy storage system | Driver Solar Facility
Public Utilities, General Disclosures [Line Items]
Estimated costs													$ 389,400,000								$ 389,400,000
Arkansas Cypress Solar | ENTERGY ARKANSAS, LLC | Battery energy storage system | Jones Mill
Public Utilities, General Disclosures [Line Items]
Estimated costs													161,200,000								161,200,000
Arkansas Cypress Solar | ENTERGY ARKANSAS, LLC | Battery energy storage system | Subsequent Event | Driver Solar Facility
Public Utilities, General Disclosures [Line Items]
Generation capacity requested | MW	250
Arkansas Cypress Solar | ENTERGY ARKANSAS, LLC | Battery energy storage system | Subsequent Event | Jones Mill
Public Utilities, General Disclosures [Line Items]
Generation capacity requested | MW	100
Arkansas Cypress Solar | ENTERGY ARKANSAS, LLC | Battery energy storage system | Subsequent Event | Big Island Solar Facility
Public Utilities, General Disclosures [Line Items]
Generation capacity requested | MW	440
Arkansas Cypress Solar | ENTERGY ARKANSAS, LLC | Arkansas Cypress Solar
Public Utilities, General Disclosures [Line Items]
Estimated costs													1,602,000,000								$ 1,602,000,000
Resilience Plan Cost Recovery Rider | ENTERGY LOUISIANA, LLC
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider				$ 114,200,000						$ 101,800,000				$ 50,200,000	$ 40,400,000
Initial application period																		5 years
Resilience plan term																		10 years
Investment in resilience plan requested																		$ 5,000,000,000
Initial resilience plan period																	5 years
Investment in resilience plan																	$ 1,900,000,000
Incremental annual revenues				12,400,000						51,600,000				9,800,000	$ 38,900,000
Requested additional costs		600,000,000
Resilience Plan Cost Recovery Rider | ENTERGY LOUISIANA, LLC | Resilience Rider Under-Recovery
Public Utilities, General Disclosures [Line Items]
Regulatory asset				$ 2,500,000										$ 5,600,000
Resilience Plan Cost Recovery Rider | ENTERGY LOUISIANA, LLC | Resilience Rider Over-Recovery
Public Utilities, General Disclosures [Line Items]
Regulatory liability										$ 16,600,000
Vegetation Management Rider | ENTERGY LOUISIANA, LLC
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider							$ 20,000,000
Prior spending percentage cap											100.00%
Prior customer bill percentage cap											1.00%
2025 Formula Rate Plan Filing | ENTERGY LOUISIANA, LLC
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider					$ 222,000,000
Requested return on common equity					9.70%
Earned rate of return on common equity					9.63%
Basis points bandwidth above and below midpoint return on common equity					40
Customer rate credits					$ 73,000,000
2025 Formula Rate Plan Filing | ENTERGY LOUISIANA, LLC | 2025 Test Year
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider					$ 0
Request for Extension of Formula Rate Plan | ENTERGY LOUISIANA, LLC
Public Utilities, General Disclosures [Line Items]
Basis points bandwidth above and below midpoint return on common equity					0.0040
Approved rate extension period					1 year
Approved return on equity					9.70%
Request for Extension of Formula Rate Plan | ENTERGY NEW ORLEANS, LLC
Public Utilities, General Disclosures [Line Items]
Approved rate extension period				4 years
Resilience and Storm Hardening Cost Recovery Rider Adjustment to the Formula Rate Plan | ENTERGY NEW ORLEANS, LLC
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider												$ 11,800,000				$ 1,100,000
River Bend Deregulated Asset Plan Filing | ENTERGY LOUISIANA, LLC
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider													$ 49,000,000
Rate sold to retail customers | $ / kWh													4.6
Distribution Cost Recovery Factor Rider | ENTERGY TEXAS, INC.
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider		127,300,000					112,500,000
Incremental annual revenues		$ 14,800,000					20,400,000
Transmission Cost Recovery Factor Rider | ENTERGY TEXAS, INC.
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider												30,300,000
Incremental annual revenues												$ 20,600,000
Transmission Cost Recovery Factor Rider | ENTERGY TEXAS, INC. | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider	$ 56,700,000
Incremental annual revenues	26,400,000
Generation Cost Recovery Factor Rider | ENTERGY TEXAS, INC.
Public Utilities, General Disclosures [Line Items]
Capacity cost recovery rider								$ 150,400,000
Generation Cost Recovery Factor Rider | ENTERGY TEXAS, INC. | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Reduction in annual revenues	$ 5,700,000
Net Operating Loss Carryforward Proceeding
Public Utilities, General Disclosures [Line Items]
Approved rate extension period			60 days
River Bend 70 Depreciation LPSC Complaint | ENTERGY TEXAS, INC.
Public Utilities, General Disclosures [Line Items]
Potential surcharges due from Entergy Texas to Entergy Louisiana						$ 100,000,000
Joint Targeted Interconnection Queue Cost Allocation Dispute | ENTERGY TEXAS, INC.
Public Utilities, General Disclosures [Line Items]
Estimate of proposed MISO cost assignment charges			$ 70,000,000				$ 112,000,000
Proposed payment timing			20 years				20 years