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Stock Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 30, 2020
Jan. 31, 2020
Mar. 31, 2020
Sep. 30, 2020
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)     530,716  
Weighted-average grant-date fair value of options granted (in dollars per share)     $ 11.45  
Stock options outstanding       2,424,013
Weighted-average exercise price of stock options outstanding (in dollars per share)       $ 89.66
Intrinsic value in the money stock options       $ 38.7
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   313,805    
Restricted stock awards granted value (in dollars per share)   $ 131.72    
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   134,853    
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) $ 169.74      
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) $ 131.72