Stock-Based Compensation (Schedule Of Financial Information Of Options) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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	$ 4.3	$ 4.1	$ 4.1
Tax benefit (expense) recognized in Entergy's Consolidated Net Income for the year	1.6	1.6	1.6
Compensation cost capitalized as part of fixed assets and inventory	0.7	0.7	0.7
Restricted Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	28.7	16.5	11.0
Compensation expense included in Entergy's Consolidated Net Income for the year	19.5	19.3	16.4
Tax benefit (expense) recognized in Entergy's Consolidated Net Income for the year	7.5	7.5	6.3
Compensation cost capitalized as part of fixed assets and inventory	3.9	3.1	2.6
Long-Term Incentive 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	11.8	10.7	6.0
Tax benefit (expense) recognized in Entergy's Consolidated Net Income for the year	4.5	4.1	2.3
Compensation cost capitalized as part of fixed assets and inventory	2.3	1.5	0.9
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	3.8	3.3	2.5
Compensation expense included in Entergy's Consolidated Net Income for the year	0.9	2.2	1.4
Tax benefit (expense) recognized in Entergy's Consolidated Net Income for the year	0.4	0.9	0.6
Compensation cost capitalized as part of fixed assets and inventory	$ 0.3	$ 0.3	$ 0.2