Property, Plant, And Equipment (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Construction expenditures in accounts payable	$ 281.0	$ 406.0
Entergy Arkansas [Member]
Construction expenditures in accounts payable	48.4	67.9
Entergy Louisiana [Member]
Construction expenditures in accounts payable	74.2	115.1
Entergy Mississippi [Member]
Construction expenditures in accounts payable	21.7	34.2
Entergy New Orleans [Member]
Construction expenditures in accounts payable	13.2	18.4
Entergy Texas [Member]
Construction expenditures in accounts payable	46.7	88.1
System Energy [Member]
Construction expenditures in accounts payable	$ 26.1	$ 23.2