Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Entergy Louisiana [Member] | Waterford 3 [Member]
Variable Interest Entities (Textual) [Abstract]
Payments on lease, including interest	$ 9.2
System Energy [Member] | Grand Gulf [Member]
Variable Interest Entities (Textual) [Abstract]
Payments on lease, including interest		$ 17.2	$ 17.2	$ 17.2