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Stock Based Compensation (Details 5) (Long-Term Incentive Awards [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Long-Term Incentive Awards [Member]
Employee service share-based compensation, aggregate disclosures
Fair value of long-term incentive awards as of December 31	$ 7.3	$ 10.1	$ 17.2
Compensation expense included in Entergy's Consolidated Net Income for the year	0.7	(0.9)	5.6
Tax benefit (expense) recognized in Entergy's Consolidated Net Income for the year	0.3	(0.4)	2.2
Compensation cost capitalized as part of fixed assets and inventory	$ 0.1	$ 0.1	$ 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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