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Long - Term Debt Present Value of Future Minimum Lease Payments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Year One $ 2,310,306    
Year Two 2,176,275    
Year Three 1,525,640    
Year Four 2,305,720    
Year Five 1,129,490    
Long-term Debt, Fair Value 22,573,837 $ 27,061,171  
Interest Expense, Debt 940,060 863,712 $ 837,981
Total Long-Term Debt 25,932,549 25,880,901  
System Energy [Member]      
Year One 300,000    
Year Two 0    
Year Three 272,600    
Year Four 0    
Year Five 90,000    
Long-term Debt, Fair Value 702,473 743,040  
Interest Expense, Debt 37,381 38,393 $ 34,467
Total Long-Term Debt 777,905 $ 741,296  
Grand Gulf [Member] | System Energy [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 154,688    
Long-term Debt, Fair Value 240,628    
Interest Expense, Debt 206,330    
Total Long-Term Debt $ 34,298