Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended				12 Months Ended
	Aug. 31, 2024	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Asset Retirement Obligation, Revision of Estimate						$ (9.0)	$ (67.3)
Entergy Louisiana [Member]
Asset Retirement Obligation, Revision of Estimate						(4.6)	(107.1)
Entergy Louisiana [Member] \| Nelson Industrial Steam Company Units 1 and 2 [Member]
Asset Retirement Obligation, Revision of Estimate			$ 19.4
Receipt of cash resulting from wind up of partnership	$ 21.3
Entergy Louisiana [Member] \| Waterford 3 [Member]
Asset Retirement Obligation, Revision of Estimate		$ 121.5
System Energy [Member]
Asset Retirement Obligation, Revision of Estimate						0.0	0.0
Entergy Arkansas [Member]
Asset Retirement Obligation, Revision of Estimate						(0.9)	20.2
Entergy Arkansas [Member] \| Walnut Bend Solar facility [Member]
Asset Retirement Obligation, Revision of Estimate							4.5
Entergy Arkansas [Member] \| Driver Solar facility [Member]
Asset Retirement Obligation, Revision of Estimate							13.2
Entergy Arkansas [Member] \| ANO [Member]
Asset Retirement Obligation, Revision of Estimate					$ 14.4
Entergy Arkansas [Member] \| Independence and White Bluff
Asset Retirement Obligation, Revision of Estimate				$ 31.2
Entergy Mississippi [Member]
Asset Retirement Obligation, Revision of Estimate						0.0	11.8
Entergy Mississippi [Member] \| Sunflower Solar facility [Member]
Asset Retirement Obligation, Revision of Estimate							4.0
Entergy Mississippi [Member] \| Independence
Asset Retirement Obligation, Revision of Estimate				$ 9.1
Entergy Texas [Member]
Asset Retirement Obligation, Revision of Estimate						(3.4)	5.2
Entergy New Orleans [Member]
Asset Retirement Obligation, Revision of Estimate						$ 0.0	$ 0.0