Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Entergy Louisiana [Member]
Variable Interest Entity [Line Items]
Payments on lease, including interest		$ 7.8	$ 8.3	$ 28.8	$ 31.0
Entergy New Orleans [Member]
Variable Interest Entity [Line Items]
Issuance Of Debt	$ 98.7
System Energy [Member]
Variable Interest Entity [Line Items]
Payments on lease, including interest		$ 14.6		$ 52.3	$ 51.6
Waterford Three [Member]
Variable Interest Entity [Line Items]
Percentage in power plant owned by VIE				9.30%
Grand Gulf [Member]
Variable Interest Entity [Line Items]
Percentage in power plant owned by VIE				11.50%