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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. 31, 2019
Mar. 31, 2019
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards under Entergy's plans, years     3 years
Equity Ownership And Long Term Cash Incentive Plan Two Thousand Fifteen [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option granted (in shares)   693,161  
Weighted-average grant-date fair value of options granted (in dollars per share)   $ 8.32  
Stock options outstanding     2,912,294
Weighted-average exercise price of stock options outstanding (in dollars per share)     $ 78.64
Intrinsic value in the money stock options     $ 70.8
Restricted Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards under Entergy's plans, years     3 years
Restricted Awards [Member] | Equity Ownership And Long Term Cash Incentive Plan Two Thousand Fifteen [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards granted 355,537    
Restricted stock awards granted value (in dollars per share) $ 89.19    
Long Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards under Entergy's plans, years     3 years
Long Term Incentive Plan [Member] | Equity Ownership And Long Term Cash Incentive Plan Two Thousand Fifteen [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Long-term incentive plan awards 180,824    
Percent of performance measure based on relative total shareholder return 80.00%   80.00%
Percent of performance measure based on cumulative adjusted EPS metric 20.00%   20.00%
Long Term Incentive Plan [Member] | Equity Ownership And Long Term Cash Incentive Plan Two Thousand Fifteen [Member] | Performance measure based on relative total shareholder return [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards granted value (in dollars per share) $ 102.07    
Long Term Incentive Plan [Member] | Equity Ownership And Long Term Cash Incentive Plan Two Thousand Fifteen [Member] | Performance measure based on cumulative adjusted earnings per share metric [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards granted value (in dollars per share) $ 89.19