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Stock Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 28, 2016
Jan. 31, 2016
Mar. 31, 2016
Jun. 30, 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       7,386,878
Weighted-average exercise price of stock options outstanding (in dollars per share)       $ 84.48
Intrinsic value in the money stock options       $ 36.2
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