Rate And Regulatory Matters (Fuel And Purchased Power Cost Recovery) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Entergy Arkansas [Member]
Deferred fuel costs	$ 130.4	$ 163.6
Deferred fuel cost noncurrent	67.1	66.9
Entergy Louisiana [Member]
Deferred fuel costs	96.7	119.9
Deferred fuel cost noncurrent	168.1	168.1
Entergy Mississippi [Member]
Deferred fuel costs	32.4	7.0
Entergy New Orleans [Member]
Deferred fuel costs	(3.7)	8.9
Deferred fuel cost noncurrent	4.1	4.1
Entergy Texas [Member]
Deferred fuel costs	$ (67.3)	$ (54.5)