Stock-Based Compensation (Financial Information For Stock Options) (Details) (Parent Company [Member], Employee Stock Option [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Parent Company [Member] | Employee Stock Option [Member]
Employee service share-based compensation, aggregate disclosures
Compensation expense included in Entergy's net income	$ 1.0	$ 1.0	$ 3.1	$ 3.2
Tax benefit recognized in Entergy's net income	0.4	0.4	1.2	1.3
Compensation cost capitalized as part of fixed assets and inventory	$ 0.2	$ 0.2	$ 0.5	$ 0.6