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LONG-TERM AND SHORT-TERM DEBT (Details) - USD ($)
6 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Related Party Transaction, Due from (to) Related Party, Current     $ 195,000,000 $ 28,000,000
Proceeds from Issuance of First Mortgage Bond     300,000,000  
SCEG        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount     67,800,000 67,800,000
Related Party Transaction, Due from (to) Related Party, Current     177,000,000 $ 37,000,000
Proceeds from Issuance of First Mortgage Bond     400,000,000  
Genco        
Debt Instrument [Line Items]        
Secured Debt     160,000,000  
Interest Expense, Debt     $ 0.0606  
PSNC Energy [Member]        
Debt Instrument [Line Items]        
Senior Notes $ 100,000,000 $ 150,000,000    
Debt Instrument, Interest Rate, Increase (Decrease) 4.33% 4.18%