Property, Plant, And Equipment (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Construction expenditures in accounts payable	$ 402.0	$ 723.0
Entergy Arkansas [Member]
Construction expenditures in accounts payable	33.5	35.6
Entergy Louisiana [Member]
Construction expenditures in accounts payable	239.7	507.9
Entergy Mississippi [Member]
Construction expenditures in accounts payable	13.8	26.5
Entergy New Orleans [Member]
Construction expenditures in accounts payable	4.0
Entergy Texas [Member]
Construction expenditures in accounts payable	35.1	73.1
System Energy [Member]
Construction expenditures in accounts payable	$ 34.5	$ 23.4