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Stock-Based Compensation (Financial Information For Stock Options) (Details) - Employee Stock Option [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Employee service share-based compensation, aggregate disclosures        
Compensation expense included in Entergy's net income $ 1.0 $ 1.1 $ 2.0 $ 2.2
Tax benefit recognized in Entergy's net income 0.3 0.3 0.5 0.6
Compensation cost capitalized as part of fixed assets and inventory $ 0.3 $ 0.2 $ 0.6 $ 0.4