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LONG-TERM AND SHORT-TERM DEBT (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Debt Instrument [Line Items]          
First Mortgage Bonds         $ 425.0
First Mortgage Bonds rate         4.10%
Debt Instrument, Interest Rate, Stated Percentage       0.78%  
Nuclear Fuel Financing       $ 100.0  
SCEG          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage         4.50%
First Mortgage Bonds due 2064         $ 75.0
First Mortgage Bonds issued May 2014         $ 300.0
Debt Instrument, Face Amount $ 67.8   $ 67.8    
Related Party Transaction, Due from (to) Related Party, Current $ 31.0   $ 29.0    
PSNC Energy [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage   4.18%     4.13%
Senior Notes   $ 150.0     $ 100.0