LONG-TERM AND SHORT-TERM DEBT (Details 2) (USD $) In Millions, unless otherwise specified																	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Oct. 15, 2012	Sep. 30, 2013 Wells Fargo Bank, National Association (Member)	Sep. 30, 2013 Bank of America, N.A. (Member)	Sep. 30, 2013 Morgan Stanly Bank, N.A. (Member)	Sep. 30, 2013 Branch Banking and Trust Company (Member)	Sep. 30, 2013 Credit Suisse AG, Cayman Islands Branch (Member)	Sep. 30, 2013 JPMorgan Chase Bank, N.A. (Member)	Sep. 30, 2013 Mizuho Corporate Bank, Ltd (Member)	Sep. 30, 2013 TD Bank, N.A. (Member)	Sep. 30, 2013 UBS Loan Finance LLC (Member)	Sep. 30, 2013 Deutsche Bank AG New York Branch [Member] [Member]	Sep. 30, 2013 Union Bank, N.A. (Member)	Sep. 30, 2013 US Bank National Association (Member)	Sep. 30, 2013 Two other banks [Domain]	Sep. 30, 2013 SCEG	Dec. 31, 2012 SCEG	Oct. 15, 2012 SCEG	Sep. 30, 2012 SCEG	Sep. 30, 2013 SCEG Wells Fargo Bank, National Association (Member)	Sep. 30, 2013 SCEG Bank of America, N.A. (Member)	Sep. 30, 2013 SCEG Morgan Stanly Bank, N.A. (Member)	Sep. 30, 2013 SCEG Branch Banking and Trust Company (Member)	Sep. 30, 2013 SCEG Credit Suisse AG, Cayman Islands Branch (Member)	Sep. 30, 2013 SCEG JPMorgan Chase Bank, N.A. (Member)	Sep. 30, 2013 SCEG Mizuho Corporate Bank, Ltd (Member)	Sep. 30, 2013 SCEG TD Bank, N.A. (Member)	Sep. 30, 2013 SCEG UBS Loan Finance LLC (Member)	Sep. 30, 2013 SCEG Deutsche Bank AG New York Branch [Member] [Member]	Sep. 30, 2013 SCEG Union Bank, N.A. (Member)	Sep. 30, 2013 SCEG US Bank National Association (Member)	Sep. 30, 2013 SCEG Two other banks [Domain]	Sep. 30, 2013 Parent Company [Member]	Dec. 31, 2012 Parent Company [Member]	Sep. 30, 2012 Parent Company [Member]	Sep. 30, 2013 Retail Gas Marketing and Energy Marketing	Dec. 31, 2012 Retail Gas Marketing and Energy Marketing	Sep. 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)	Sep. 30, 2013 SCE&G (including Fuel Company) Wells Fargo Bank, National Association (Member)	Sep. 30, 2013 SCE&G (including Fuel Company) Branch Banking and Trust Company (Member)	Sep. 30, 2013 SCE&G (including Fuel Company) Credit Suisse AG, Cayman Islands Branch (Member)	Mar. 31, 2013 Fuel Company	Sep. 30, 2012 Fuel Company	Sep. 30, 2013 PSNC Energy	Dec. 31, 2012 PSNC Energy	Sep. 30, 2012 PSNC Energy	Sep. 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																	122.0	124.0																			13.2	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																																		68	142				310		449								0	32
Commercial paper, weighted average interest rate (as a percent)																																		0.427%	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																																		229	155				1,090		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%	8.90%	8.90%	8.90%	8.90%	8.90%	8.90%	6.30%	6.30%	6.30%	6.00%					10.70%	10.70%	10.70%	8.90%	8.90%	8.90%	8.90%	8.90%	8.90%	6.30%	6.30%	6.30%	6.00%											10.70%	6.30%	8.90%
Number of other banks (in entities)			2																2
Related Party Transaction, Due from (to) Related Party, Current	$ 39.6	$ 49.4