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Asset Retirement Obligations (Cumulative Decommissioning And Retirement Cost Liabilities And Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation $ 4,757.1 $ 6,469.5 $ 6,159.2
Accretion 317.9 394.6  
Spending (1,997.1)    
Asset Retirement Obligation, Period Increase (Decrease) 33.2 84.3  
Entergy Arkansas [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 1,390.4 1,314.2 1,242.6
Accretion 77.7 73.3  
Spending (1.5)    
Asset Retirement Obligation, Period Increase (Decrease) 0.0 1.7  
Entergy Louisiana [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 1,653.2 1,573.3 1,497.3
Accretion 79.9 76.0  
Spending 0.0    
Asset Retirement Obligation, Period Increase (Decrease) 0.0 0.0  
Entergy Mississippi [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 10.3 9.8 9.7
Accretion 0.5 0.6  
Spending 0.0    
Asset Retirement Obligation, Period Increase (Decrease) 0.0 0.5  
Entergy New Orleans [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 4.0 3.8 3.5
Accretion 0.2 0.3  
Spending 0.0    
Asset Retirement Obligation, Period Increase (Decrease) 0.0 0.0  
Entergy Texas [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 8.5 8.1 7.6
Accretion 0.4 0.5  
Spending 0.0    
Asset Retirement Obligation, Period Increase (Decrease) 0.0 0.0  
System Energy [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 1,007.6 968.9 931.7
Accretion 38.7 37.2  
Spending 0.0    
Asset Retirement Obligation, Period Increase (Decrease) 0.0 0.0  
Entergy Wholesale Commodities [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 0.6 0.5 0.5
Accretion 0.1 0.0  
Spending 0.0    
Asset Retirement Obligation, Period Increase (Decrease) 0.0 0.0  
Big Rock Point [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 42.0 41.1 40.3
Accretion 3.4 3.3  
Spending 0.0    
Asset Retirement Obligation, Period Increase (Decrease) 2.5 2.5  
Indian Point 1 [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 0.0 246.6 238.6
Accretion 8.8 20.4  
Spending (254.1)    
Asset Retirement Obligation, Period Increase (Decrease) 1.3 12.4  
Indian Point 2 [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 0.0 839.8 829.0
Accretion 28.9 69.4  
Spending (843.6)    
Asset Retirement Obligation, Period Increase (Decrease) 25.1 58.6  
Indian Point 3 [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 0.0 869.4 808.4
Accretion 29.1 67.4  
Spending (897.9)    
Asset Retirement Obligation, Period Increase (Decrease) 0.6 6.4  
Palisades [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation 640.4 594.1 $ 549.8
Accretion 50.1 46.4  
Spending 0.0    
Asset Retirement Obligation, Period Increase (Decrease) $ 3.8 $ 2.1