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Stock-Based Compensation (Details) (Employee Stock Option [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Stock Option [Member]
Employee service share-based compensation, aggregate disclosures
Compensation expense included in Entergy's Consolidated Net Income	$ 10.4	$ 15.0	$ 16.8
Tax benefit recognized in Entergy's Consolidated Net Income	4.0	5.8	6.5
Compensation cost capitalized as part of fixed assets and inventory	$ 2.0	$ 2.9	$ 3.2

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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