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LONG-TERM AND SHORT-TERM DEBT (Details 2) (USD $)
In Millions, unless otherwise specified
May 01, 2013
Mar. 31, 2013
Dec. 31, 2012
Oct. 15, 2012
Sep. 30, 2012
Lines of credit:          
Line of Credit Facility, Maximum Borrowing Capacity     $ 1,800    
Number of other banks (in entities)       2  
Related Party Transaction, Due from (to) Related Party, Current   48.8 49.4    
Wells Fargo Bank, National Association (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank 10.70% 10.70%      
Bank of America, N.A. (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank   10.70%      
Morgan Stanly Bank, N.A. (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank   10.70%      
Branch Banking and Trust Company (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank   8.90%      
Credit Suisse AG, Cayman Islands Branch (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank   8.90% 8.90%    
JPMorgan Chase Bank, N.A. (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank   8.90%      
Mizuho Corporate Bank, Ltd (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank   8.90%      
TD Bank, N.A. (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank   8.90%      
UBS Loan Finance LLC (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank   8.90%      
Deutsche Bank AG, New York Branch (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank   6.30%      
Union Bank, N.A. (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank   6.30%      
US Bank National Association (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank   6.30%      
SCEG
          
Debt Instrument [Line Items]          
Due to Affiliate, Current   128.0 124.0    
Debt Instruments [Abstract]          
Face value of Industrial Revenue Bonds issued, proceeds of which were availed as loan   67.8      
Lines of credit:          
Line of Credit Facility, Maximum Borrowing Capacity         1,200
3 year credit agreement     200    
Number of other banks (in entities)       2  
Parent Company [Member]
          
Lines of credit:          
Line of Credit Facility, Maximum Borrowing Capacity   300 300   300
Commercial Paper   122 142    
Commercial paper, weighted average interest rate (as a percent)   0.4818% 0.58%    
Letters of credit supported by LOC   3.0 3.0    
Line of Credit Facility, Remaining Borrowing Capacity   175 155    
LOC advances   0 0    
Retail Gas Marketing and Energy Marketing
          
Debt Instrument [Line Items]          
Due to Affiliate, Current   14.1 13.1    
SCE&G (including Fuel Company)
          
Lines of credit:          
Line of Credit Facility, Maximum Borrowing Capacity 200 1,400 1,400 1,400 1,200
Commercial Paper   408 449    
Commercial paper, weighted average interest rate (as a percent)   0.33% 0.42%    
Letters of credit supported by LOC   0 0    
Line of Credit Facility, Remaining Borrowing Capacity   992 951    
LOC advances   0 0    
SCE&G (including Fuel Company) | Wells Fargo Bank, National Association (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank     10.70%    
SCE&G (including Fuel Company) | Branch Banking and Trust Company (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank     6.30%    
SCE&G (including Fuel Company) | Credit Suisse AG, Cayman Islands Branch (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank     8.90%    
SCE and G [Member] | Deutsche Bank AG, New York Branch (Member)
          
Lines of credit:          
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank 6.30%        
Fuel Company
          
Lines of credit:          
Line of Credit Facility, Maximum Borrowing Capacity   500     500
PSNC Energy
          
Lines of credit:          
Line of Credit Facility, Maximum Borrowing Capacity     100   100
Commercial Paper   0 32    
Commercial paper, weighted average interest rate (as a percent)   0.00% 0.44%    
Letters of credit supported by LOC   0 0    
Line of Credit Facility, Remaining Borrowing Capacity   100 68    
LOC advances   $ 0 $ 0