REVOLVING CREDIT FACILITIES, LINES OF CREDIT, SHORT-TERM BORROWINGS, AND LONG-TERM DEBT (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Schedule of Letter of Credit Facilities) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Financial transmission rights
Debt Instrument [Line Items]
Letters of Credit	$ 5.0	$ 2.0
ENTERGY ARKANSAS, LLC | Financial transmission rights
Debt Instrument [Line Items]
Letters of Credit	3.2	0.1
ENTERGY LOUISIANA, LLC | Financial transmission rights
Debt Instrument [Line Items]
Letters of Credit		0.8
ENTERGY MISSISSIPPI, LLC | Financial transmission rights
Debt Instrument [Line Items]
Letters of Credit		0.8
ENTERGY NEW ORLEANS, LLC | Financial transmission rights
Debt Instrument [Line Items]
Letters of Credit	0.5
ENTERGY TEXAS, INC. | Financial transmission rights
Debt Instrument [Line Items]
Letters of Credit	1.0	$ 0.1
Uncommitted Credit Facility of $100 Million | ENTERGY ARKANSAS, LLC
Debt Instrument [Line Items]
Capacity	$ 100.0
Commitment fee	0.78%
Letters of Credit	$ 59.2
Uncommitted Credit Facility of $200 Million | ENTERGY ARKANSAS, LLC
Debt Instrument [Line Items]
Capacity	$ 200.0
Commitment fee	0.50%
Letters of Credit	$ 118.3
Uncommitted Credit Facility of $125 Million | ENTERGY LOUISIANA, LLC
Debt Instrument [Line Items]
Capacity	$ 125.0
Commitment fee	0.78%
Letters of Credit	$ 118.1
Uncommitted Credit Facility of $125 Million | ENTERGY LOUISIANA, LLC | Financial transmission rights
Debt Instrument [Line Items]
Letters of Credit	3.2
Uncommitted Credit Facility of $125 Million | ENTERGY NEW ORLEANS, LLC | Financial transmission rights
Debt Instrument [Line Items]
Letters of Credit	0.5
Uncommitted Credit Facility of $60 Million | ENTERGY LOUISIANA, LLC
Debt Instrument [Line Items]
Capacity	$ 120.0
Commitment fee	0.50%
Letters of Credit	$ 63.1
Uncommitted Credit Facility of $60 Million | ENTERGY LOUISIANA, LLC | MISO
Debt Instrument [Line Items]
Letters of Credit	43.1
Uncommitted Credit Facility of $60 Million | ENTERGY LOUISIANA, LLC | Non-MISO
Debt Instrument [Line Items]
Letters of Credit	20.0
Uncommitted Credit Facility of $65 Million | ENTERGY MISSISSIPPI, LLC | MISO
Debt Instrument [Line Items]
Letters of Credit	63.4
Uncommitted Credit Facility of $65 Million | ENTERGY MISSISSIPPI, LLC | Non-MISO
Debt Instrument [Line Items]
Letters of Credit	1.3
Uncommitted Credit Facility of $65 Million | ENTERGY MISSISSIPPI, LLC | Facility 1
Debt Instrument [Line Items]
Capacity	$ 65.0
Commitment fee	0.78%
Letters of Credit	$ 64.7
Uncommitted Credit Facility of $65 Million | ENTERGY MISSISSIPPI, LLC | Facility 2
Debt Instrument [Line Items]
Capacity	$ 65.0
Commitment fee	0.50%
Letters of Credit	$ 62.2
Uncommitted Credit Facility of $1 Million | ENTERGY NEW ORLEANS, LLC
Debt Instrument [Line Items]
Capacity	$ 1.0
Commitment fee	1.625%
Letters of Credit	$ 0.5
Uncommitted Credit Facility of $150 Million | ENTERGY TEXAS, INC.
Debt Instrument [Line Items]
Capacity	$ 150.0
Commitment fee	1.25%
Letters of Credit	$ 95.1
Uncommitted Credit Facility of $150 Million | ENTERGY TEXAS, INC. | Financial transmission rights
Debt Instrument [Line Items]
Letters of Credit	1.0
Uncommitted Credit Facility of $160 Million | ENTERGY TEXAS, INC.
Debt Instrument [Line Items]
Capacity	$ 160.0
Commitment fee	1.05%
Letters of Credit	$ 0.0