Property, Plant, And Equipment (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Construction expenditures in accounts payable	$ 254.0	$ 745.0
Entergy Arkansas [Member]
Construction expenditures in accounts payable	35.3	59.7
Entergy Louisiana [Member]
Construction expenditures in accounts payable	95.7	460.5
Entergy Mississippi [Member]
Construction expenditures in accounts payable	26.3	31.4
Entergy New Orleans [Member]
Construction expenditures in accounts payable	3.8	9.2
Entergy Texas [Member]
Construction expenditures in accounts payable	45.0	116.8
System Energy [Member]
Construction expenditures in accounts payable	$ 16.7	$ 17.7