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Stock Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Jan. 28, 2016
Jan. 31, 2016
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option granted (in shares)     696,900
Weighted-average grant-date fair value of options granted (in dollars per share)     $ 7.40
Stock options outstanding     7,562,576
Weighted-average exercise price of stock options outstanding (in dollars per share)     $ 84.06
Intrinsic value in the money stock options     $ 30.5
Vesting period of awards under Entergy's plans, years     3 years
Equity Ownership And Long Term Cash Incentive Plan Two Thousand Eleven [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Long-term incentive plan awards   199,800  
LTIP awards granted value (in dollars per share) $ 84.52    
Restricted Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards granted   370,000  
Restricted stock awards granted value (in dollars per share) $ 70.56