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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		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Employee Stock Option [Member]
Employee service share-based compensation, aggregate disclosures
Compensation expense included in Entergy's net income	$ 1.9	$ 2.5	$ 5.8	$ 8.0
Tax benefit recognized in Entergy's net income	0.7	0.9	2.2	3.1
Compensation cost capitalized as part of fixed assets and inventory	$ 0.3	$ 0.5	$ 1.1	$ 1.5

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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