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LONG-TERM AND SHORT-TERM DEBT (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
SCEG      
Debt Instrument [Line Items]      
First Mortgage Bonds   $ 425.0  
Debt Instrument, Interest Rate, Stated Percentage   4.10%  
Debt Instrument, Face Amount $ 67.8   $ 67.8
Related Party Transaction, Due from (to) Related Party, Current 28.1   33.0
Due from Other Related Parties, Current     $ 9.0
PSNC Energy [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   4.13%  
Senior Notes   $ 100.0  
Nuclear Fuel Contract [Domain]      
Debt Instrument [Line Items]      
Long Term Contract for Nuclear Fuel Purchase $ 100.0    
Debt Instrument, Interest Rate, Stated Percentage 0.78%    
First Mortgage Bonds [Member] | SCEG      
Debt Instrument [Line Items]      
First Mortgage Bonds   $ 75.0  
Debt Instrument, Interest Rate, Stated Percentage   4.50%  
first mortgage bond issued May 2014 [Member] | SCEG      
Debt Instrument [Line Items]      
First Mortgage Bonds $ 300.0    
Debt Instrument, Interest Rate, Stated Percentage 4.50%