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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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 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	$ 3.9	$ 5.5
Tax benefit recognized in Entergy's net income	0.7	1.0	1.5	2.1
Compensation cost capitalized as part of fixed assets and inventory			$ 0.8	$ 1.0

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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