Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Entergy Louisiana [Member]
Variable Interest Entities (Textual) [Abstract]
Payments on lease, including interest	$ 9.2		$ 28.8	$ 31.0
System Energy [Member]
Variable Interest Entities (Textual) [Abstract]
Payments on lease, including interest		$ 17.2	$ 52.3	$ 51.6