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Stock Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Jan. 28, 2021
Jan. 31, 2021
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards under Entergy's plans, years     3 years
2019 Omnibus Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option granted (in shares)     508,704
Weighted-average grant-date fair value of options granted (in dollars per share)     $ 12.27
Stock options outstanding     2,890,582
Weighted-average exercise price of stock options outstanding (in dollars per share)     $ 90.75
Intrinsic value in the money stock options     $ 41.6
Restricted Awards [Member] | 2019 Omnibus Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards granted   392,382  
Restricted stock awards granted value (in dollars per share)   $ 95.87  
Long Term Incentive Plan [Member] | 2019 Omnibus Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Long-term incentive plan awards   203,983  
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] | 2019 Omnibus Incentive Plan | 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) $ 110.74    
Long Term Incentive Plan [Member] | 2019 Omnibus Incentive Plan | 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) $ 95.87