Variable Interest Entities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Entergy Louisiana [Member]
Variable Interest Entities (Textual) [Abstract]
Payments on lease, including interest	$ 21.0	$ 22.7
System Energy [Member]
Variable Interest Entities (Textual) [Abstract]
Payments on lease, including interest	$ 37.6	$ 51.6
Waterford Three [Member]
Variable Interest Entities (Textual) [Abstract]
Percentage in power plant owned by VIE	9.30%
Grand Gulf [Member]
Variable Interest Entities (Textual) [Abstract]
Percentage in power plant owned by VIE	11.50%