Property, Plant, And Equipment (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Construction expenditures in accounts payable	$ 306.0	$ 311.0
Entergy Arkansas [Member]
Construction expenditures in accounts payable	41.7	35.7
Entergy Louisiana [Member]
Construction expenditures in accounts payable	74.0	104.6
Entergy Mississippi [Member]
Construction expenditures in accounts payable	14.7	13.6
Entergy New Orleans [Member]
Construction expenditures in accounts payable	13.9	5.8
Entergy Texas [Member]
Construction expenditures in accounts payable	81.6	55.6
System Energy [Member]
Construction expenditures in accounts payable	$ 24.6	$ 26.3