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	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligation, Revision of Estimate							$ (67.3)	$ 14.9
Entergy Louisiana [Member]
Asset Retirement Obligation, Revision of Estimate							(107.1)	10.8
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
Entergy Louisiana [Member] | River Bend [Member]
Asset Retirement Obligation, Revision of Estimate						$ 10.8
System Energy [Member]
Asset Retirement Obligation, Revision of Estimate							0.0	0.0
Entergy Arkansas [Member]
Asset Retirement Obligation, Revision of Estimate							20.2	0.0
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							11.8	0.0
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							5.2	0.0
Entergy New Orleans [Member]
Asset Retirement Obligation, Revision of Estimate							$ 0.0	$ 4.1