INCOME TAXES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended
	Oct. 31, 2026	Sep. 30, 2026	May 31, 2026	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Jan. 01, 2027	Apr. 30, 2026
Income Tax Contingency [Line Items]
Tax credits received		$ 223,800
Changes in other regulatory liabilities						$ (83,354)	$ 143,848
Amortization of tax gross-up on customer advances				$ 43,500	$ 20,800	106,700	45,400
ENTERGY ARKANSAS, LLC
Income Tax Contingency [Line Items]
Tax credits received		99,200
Income tax rate reduction									4.30%
Changes in other regulatory liabilities						29,691	160,749
Amortization of tax gross-up on customer advances				7,000	2,100	11,200	3,400
ENTERGY ARKANSAS, LLC | Income taxes
Income Tax Contingency [Line Items]
Changes in other regulatory liabilities			$ 16,000
ENTERGY ARKANSAS, LLC | Subsequent Event
Income Tax Contingency [Line Items]
Tax credits received	$ 32,100
Income tax rate reduction								4.10%
ENTERGY LOUISIANA, LLC
Income Tax Contingency [Line Items]
Tax credits received		55,800
Changes in other regulatory liabilities						(118,055)	(89,444)
Amortization of tax gross-up on customer advances				25,900	14,800	68,400	28,200
SYSTEM ENERGY RESOURCES, INC.
Income Tax Contingency [Line Items]
Tax credits received		$ 68,800
Changes in other regulatory liabilities						(15,142)	131,917
ENTERGY MISSISSIPPI, LLC
Income Tax Contingency [Line Items]
Changes in other regulatory liabilities						15,028	2,850
Amortization of tax gross-up on customer advances				9,100	2,600	24,900	10,200
ENTERGY TEXAS, INC.
Income Tax Contingency [Line Items]
Changes in other regulatory liabilities						22,682	(20,878)
Amortization of tax gross-up on customer advances				$ 1,500	$ 1,300	$ 2,200	$ 3,600