Property, Plant, And Equipment (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Construction expenditures in accounts payable	$ 292.0	$ 311.0
Entergy Arkansas [Member]
Construction expenditures in accounts payable	37.9	35.7
Entergy Louisiana [Member]
Construction expenditures in accounts payable	71.3	104.6
Entergy Mississippi [Member]
Construction expenditures in accounts payable	10.8	13.6
Entergy New Orleans [Member]
Construction expenditures in accounts payable	9.9	5.8
Entergy Texas [Member]
Construction expenditures in accounts payable	52.4	55.6
System Energy [Member]
Construction expenditures in accounts payable	$ 19.7	$ 26.3