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Stock-Based Compensation (Financial Information For Other Equity Plans) (Details) (Restricted Stock Awards [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
Restricted Stock Awards [Member]
Employee service share-based compensation, aggregate disclosures
Compensation expense included in Entergy's net income	$ 3.7	$ 1.0	$ 11.0	$ 2.9
Tax benefit recognized in Entergy's net income	1.4	0.4	4.2	1.1
Compensation cost capitalized as part of fixed assets and inventory	$ 0.6	$ 0.2	$ 1.9	$ 0.5

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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