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Stock-Based Compensation (Financial Information For Stock Options) (Details) (Employee Stock Option [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Employee Stock Option [Member]
Employee service share-based compensation, aggregate disclosures
Compensation expense included in Entergy's net income	$ 1.3	$ 2.1
Tax benefit recognized in Entergy's net income	0.5	0.8
Compensation cost capitalized as part of fixed assets and inventory	$ 0.2	$ 0.4

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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