Stock-Based Compensation (Financial Information For Stock Options) (Details) - Parent Company [Member] - Employee Stock Option [Member] - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Employee service share-based compensation, aggregate disclosures | ||||
| Compensation expense included in Entergy's net income | $ 1.1 | $ 1.1 | $ 3.3 | $ 3.2 |
| Tax benefit recognized in Entergy's net income | 0.5 | 0.4 | 1.3 | 1.2 |
| Compensation cost capitalized as part of fixed assets and inventory | $ 0.2 | $ 0.1 | $ 0.6 | $ 0.5 |