LONG-TERM AND SHORT-TERM DEBT (Details 2) (USD $) In Millions, unless otherwise specified																	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Oct. 15, 2012	Jun. 30, 2013 Wells Fargo Bank, National Association (Member)	May 01, 2013 Wells Fargo Bank, National Association (Member)	Jun. 30, 2013 Bank of America, N.A. (Member)	Jun. 30, 2013 Morgan Stanly Bank, N.A. (Member)	Jun. 30, 2013 Branch Banking and Trust Company (Member)	Jun. 30, 2013 Credit Suisse AG, Cayman Islands Branch (Member)	Jun. 30, 2013 JPMorgan Chase Bank, N.A. (Member)	Jun. 30, 2013 Mizuho Corporate Bank, Ltd (Member)	Jun. 30, 2013 TD Bank, N.A. (Member)	Jun. 30, 2013 UBS Loan Finance LLC (Member)	Jun. 30, 2013 Deutsche Bank AG, New York Branch (Member)	Jun. 30, 2013 Union Bank, N.A. (Member)	Jun. 30, 2013 US Bank National Association (Member)	Jun. 30, 2013 SCEG	Dec. 31, 2012 SCEG	Oct. 15, 2012 SCEG	Sep. 30, 2012 SCEG	Jun. 30, 2013 Parent Company [Member]	Dec. 31, 2012 Parent Company [Member]	Sep. 30, 2012 Parent Company [Member]	Jun. 30, 2013 Retail Gas Marketing and Energy Marketing	Dec. 31, 2012 Retail Gas Marketing and Energy Marketing	Jun. 30, 2013 SCE&G (including Fuel Company)	May 01, 2013 SCE&G (including Fuel Company)	Dec. 31, 2012 SCE&G (including Fuel Company)	Oct. 15, 2012 SCE&G (including Fuel Company)	Sep. 30, 2012 SCE&G (including Fuel Company)	Jun. 30, 2013 SCE&G (including Fuel Company) Wells Fargo Bank, National Association (Member)	Jun. 30, 2013 SCE&G (including Fuel Company) Branch Banking and Trust Company (Member)	Dec. 31, 2012 SCE&G (including Fuel Company) Credit Suisse AG, Cayman Islands Branch (Member)	May 01, 2013 SCE and G [Member] Deutsche Bank AG, New York Branch (Member)	Mar. 31, 2013 Fuel Company	Sep. 30, 2012 Fuel Company	Jun. 30, 2013 PSNC Energy	Dec. 31, 2012 PSNC Energy	Sep. 30, 2012 PSNC Energy	Jun. 30, 2013 Bonds [Member]	Jan. 31, 2013 Bonds [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of First Mortgage Bond																	$ 400
Repayments of First Mortgage Bond																	150
Due to Affiliate, Current																	109.0	124.0						14.8	13.1
Debt Instruments [Abstract]
Debt Instrument, Interest Rate, Stated Percentage																																								4.60%	7.125%
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	1,800																			1,200	300	300	300			1,400	200	1,400	1,400	1,200					500	500	100	100	100
Commercial Paper																					65	142				238		449									0	32
Commercial paper, weighted average interest rate (as a percent)																					0.4786%	0.58%				0.30%		0.42%									0.00%	0.44%
Letters of credit supported by LOC																					3.0	3.0				0.3		0.3									0	0
Line of Credit Facility, Remaining Borrowing Capacity																					232	155				1,162		951									100	68
LOC advances																					0	0				0		0									0	0
3 year credit agreement																		200
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank				10.70%	10.70%	10.70%	10.70%	8.90%	8.90%	8.90%	8.90%	8.90%	8.90%	6.30%	6.30%	6.30%															10.70%	6.30%	8.90%	6.30%
Number of other banks (in entities)			2																2
Related Party Transaction, Due from (to) Related Party, Current	$ 34.9	$ 49.4