Stock-Based Compensation (Schedule Of Financial Information Of Options) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense included in Entergy's Consolidated Net Income for the year	$ 7.7	$ 10.4	$ 15.0
Tax benefit (expense) recognized in Entergy's Consolidated Net Income for the year	3.0	4.0	5.8
Compensation cost capitalized as part of fixed assets and inventory	1.5	2.0	2.9
Restricted Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense included in Entergy's Consolidated Net Income for the year	11.4	3.9
Tax benefit (expense) recognized in Entergy's Consolidated Net Income for the year	4.4	1.5
Compensation cost capitalized as part of fixed assets and inventory	2.0	0.7
Long-Term Incentive Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards	4.3	7.3	10.1
Compensation expense included in Entergy's Consolidated Net Income for the year	(5.0)	0.7	(0.9)
Tax benefit (expense) recognized in Entergy's Consolidated Net Income for the year	(1.9)	0.3	(0.4)
Compensation cost capitalized as part of fixed assets and inventory	(0.9)	0.1	0.1
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards	3.0	6.6	8.3
Compensation expense included in Entergy's Consolidated Net Income for the year	1.3	3.7	3.9
Tax benefit (expense) recognized in Entergy's Consolidated Net Income for the year	0.5	1.4	1.5
Compensation cost capitalized as part of fixed assets and inventory	$ 0.2	$ 0.7	$ 0.9