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
	Mar. 31, 2014	Mar. 31, 2013
Parent Company [Member] | Employee Stock Option [Member]
Employee service share-based compensation, aggregate disclosures
Compensation expense included in Entergy's net income	$ 1.3	$ 1.3
Tax benefit recognized in Entergy's net income	0.5	0.5
Compensation cost capitalized as part of fixed assets and inventory	$ 0.2	$ 0.2