Transactions With Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Entergy Arkansas [Member]
Intercompany revenues	$ 109.8	$ 105.2	$ 117.5
Intercompany operating expenses	559.7	515.5	534.0
Intercompany interest and investment income	0.0	0.0	0.4
Entergy Louisiana [Member]
Intercompany revenues	289.9	280.5	277.8
Intercompany operating expenses	755.2	661.5	665.4
Intercompany interest and investment income	127.6	127.7	128.5
Entergy Mississippi [Member]
Intercompany revenues	1.4	1.2	1.4
Intercompany operating expenses	299.8	283.3	306.7
Intercompany interest and investment income	0.0	0.1	0.4
Entergy New Orleans [Member]
Intercompany revenues	0.0	0.0	0.0
Intercompany operating expenses	287.8	266.0	292.1
Intercompany interest and investment income	0.0	0.0	0.0
Entergy Texas [Member]
Intercompany revenues	64.3	40.4	51.6
Intercompany operating expenses	275.0	260.3	255.0
Intercompany interest and investment income	0.0	0.0	0.4
System Energy [Member]
Intercompany revenues	545.6	520.7	584.1
Intercompany operating expenses	190.8	177.4	156.2
Intercompany interest and investment income	0.0	0.2	1.0
EWO Marketing, LLC [Member] | RS Cogen [Member]
Intercompany operating expenses	$ 24.0	$ 26.0	$ 24.5