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Decommissioning Trust Funds (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
May 31, 2021
Decommissioning Fund Investments $ 5,514,016 $ 7,253,215    
Decommissioning Trust Funds [Abstract]        
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts (28,435) 17,586 $ 14,023  
Amortized cost of debt securities $ 2,125,000 2,423,000    
Average coupon rate of debt securities 2.74%      
Proceeds from the dispositions of debt securities $ 1,465,000 1,024,000 1,427,000  
Average Duration of Debt Securities in Years 6 years 11 months 8 days      
Average Maturity of Debt Securities, Years 10 years 6 months 18 days      
Equity Securities, FV-NI, Unrealized Gain $ 605,000      
Debt Securities, Available-for-sale, Allowance for Credit Loss 400 100    
Debt Securities, Available-for-sale, Realized Gain 29,000 47,000 25,000  
Debt Securities, Available-for-sale, Realized Loss 17,000 4,000 4,000  
Entergy Arkansas [Member]        
Decommissioning Fund Investments 1,438,416 1,273,921    
Decommissioning Trust Funds [Abstract]        
Amortized cost of debt securities $ 519,600 420,400    
Average coupon rate of debt securities 2.28%      
Proceeds from the dispositions of debt securities $ 57,600 94,500 110,600  
Average Duration of Debt Securities in Years 6 years 5 months 8 days      
Average Maturity of Debt Securities, Years 7 years 6 months 29 days      
Equity Securities, FV-NI, Unrealized Gain $ 163,200      
Debt Securities, Available-for-sale, Realized Gain 2,500 8,800 2,900  
Debt Securities, Available-for-sale, Realized Loss 600 200 100  
Entergy Louisiana [Member]        
Decommissioning Fund Investments $ 2,114,523 1,794,042    
Percentage Interest in River Bend 30.00%      
Decommissioning Trust Funds [Abstract]        
Amortized cost of debt securities $ 766,300 581,400    
Average coupon rate of debt securities 3.30%      
Proceeds from the dispositions of debt securities $ 303,400 159,700 186,000  
Average Duration of Debt Securities in Years 6 years 9 months 29 days      
Average Maturity of Debt Securities, Years 12 years 3 months 14 days      
Equity Securities, FV-NI, Unrealized Gain $ 249,400      
Debt Securities, Available-for-sale, Realized Gain 6,800 8,100 4,800  
Debt Securities, Available-for-sale, Realized Loss 4,100 700 300  
System Energy [Member]        
Decommissioning Fund Investments 1,385,254 1,215,868    
Decommissioning Trust Funds [Abstract]        
Amortized cost of debt securities $ 515,600 398,400    
Average coupon rate of debt securities 2.33%      
Proceeds from the dispositions of debt securities $ 513,800 252,200 338,100  
Average Duration of Debt Securities in Years 7 years 3 months 29 days      
Average Maturity of Debt Securities, Years 10 years 1 month 24 days      
Equity Securities, FV-NI, Unrealized Gain $ 155,100      
Debt Securities, Available-for-sale, Realized Gain 9,300 11,500 5,400  
Debt Securities, Available-for-sale, Realized Loss 4,000 600 $ 700  
Indian Point 3 [Member]        
Decommissioning Trust Fair Values   991,000    
Indian Point 1 [Member]        
Decommissioning Trust Fair Values   631,000    
Indian Point 2 [Member]        
Decommissioning Trust Fair Values   794,000    
Palisades [Member]        
Decommissioning Trust Fair Values 576,000 554,000    
Indian Point [Member]        
Decommissioning Trust Fair Values       $ 2,387,000
Debt Securities [Member]        
Decommissioning Trust Funds [Abstract]        
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts $ 2,000 $ 31,000