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Business Combinations (Narrative) (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
MW
May 31, 2021
USD ($)
Apr. 30, 2019
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
May 28, 2021
USD ($)
Proceeds from Sale of Productive Assets       $ 17,421 $ 0  
Payments to Acquire Productive Assets       36,534 24,633  
Entergy Texas [Member]            
Proceeds from Sale of Productive Assets       67,920 0  
Payments to Acquire Productive Assets       $ 36,534 $ 4,931  
Hardin County Peaking Facility | Entergy Texas [Member]            
Capacity Of Power Plant Unit | MW 147          
Payments to Acquire Productive Assets $ 36,700          
Montgomery County Power Station | Entergy Texas [Member]            
Proceeds from Sale of Productive Assets $ 67,900          
Percentage of Undivided Ownership Interest 7.56%          
Indian Point Energy Center | Entergy Wholesale Commodities [Member]            
Percentage of Undivided Ownership Interest     100.00%      
Gain (Loss) on Disposition of Assets   $ 340,000        
Gain (Loss) on Disposition of Assets (Net-Of-Tax)   $ 268,000        
Decommissioning Fund Investments, Fair Value           $ 2,387,000
Asset Retirement Obligation           $ 1,996,000