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Leases (Future Minimum Lease Payments Sale Leaseback Transactions) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Year One $ 1,040,631    
Year Two 2,460,563    
Year Three 2,299,475    
Year Four 1,379,140    
Year Five 2,595,720    
Long-term Debt, Fair Value 27,061,171 $ 24,813,818  
Interest Expense, Debt 863,712 837,981 $ 807,382
Total Long-Term Debt 25,880,901 22,369,776  
System Energy [Member]      
Year One 50,305    
Year Two 250,000    
Year Three 36,100    
Year Four 200,000    
Year Five 0    
Long-term Debt, Fair Value 743,040 840,540  
Interest Expense, Debt 38,393 34,467 35,328
Total Long-Term Debt 741,296 805,274  
System Energy [Member] | Grand Gulf [Member]      
Year One 17,188    
Year Two 17,188    
Year Three 17,188    
Year Four 17,188    
Year Five 17,188    
Long-term Debt, Maturities, Repayments of Principal after Year Five 171,875    
Long-term Debt, Fair Value 257,815    
Interest Expense, Debt 223,494    
Total Long-Term Debt 34,321    
Entergy Louisiana [Member]      
Year One 200,000    
Year Two 1,445,000    
Year Three 1,782,300    
Year Four 300,000    
Year Five 775,000    
Long-term Debt, Fair Value 11,492,650 10,258,294  
Interest Expense, Debt 350,227 331,352 $ 309,493
Total Long-Term Debt $ 10,914,346 $ 9,027,451