Rate And Regulatory Matters System Agreement Cost Equalization Payments (Receipts) Among Utility Operating Companies (Details) - USD ($) $ in Millions	1 Months Ended	4 Months Ended	6 Months Ended
	Jul. 31, 2015	Oct. 31, 2016	Jun. 30, 2018
Entergy Arkansas [Member]
System Agreement Bandwidth Remedy Receipts			$ (4.0)
Entergy Louisiana [Member]
System Agreement Bandwidth Remedy Receipts			(23.0)
Entergy Mississippi [Member]
System Agreement Bandwidth Remedy Payments			16.0
Entergy New Orleans [Member]
System Agreement Bandwidth Remedy Payments			5.0
Entergy Texas [Member]
System Agreement Bandwidth Remedy Payments	$ 10.9	$ 10.9	$ 6.0