LONG-TERM AND SHORT-TERM DEBT (Details 2) (USD $) In Millions, unless otherwise specified															12 Months Ended							1 Months Ended			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011 Wells Fargo Bank, National Association	Dec. 31, 2011 Bank of America, N.A.	Dec. 31, 2011 Morgan Stanly Bank, N.A.	Dec. 31, 2011 Branch Banking and Trust Company	Dec. 31, 2011 Credit Suisse AG, Cayman Islands Branch	Dec. 31, 2011 JPMorgan Chase Bank, N.A.	Dec. 31, 2011 Mizuho Corporate Bank, Ltd	Dec. 31, 2011 TD Bank, N.A.	Dec. 31, 2011 UBS Loan Finance LLC	Dec. 31, 2011 Deutsche Bank AG, New York Branch	Dec. 31, 2011 Union Bank, N.A.	Dec. 31, 2011 US Bank National Association	Dec. 31, 2011 Three other banks Entity	Dec. 31, 2011 SCANA	Dec. 31, 2010 SCANA	Dec. 31, 2011 SCE&G (including Fuel Company)	Dec. 31, 2010 SCE&G (including Fuel Company)	Dec. 31, 2011 Fuel Company	Dec. 31, 2011 PSNC Energy	Dec. 31, 2010 PSNC Energy	Jan. 31, 2012 Medium term notes	Jan. 31, 2012 First mortgage bonds	Jan. 31, 2012 6.25% medium term notes due February 1, 2012	Dec. 31, 2011 Line of credit	Dec. 31, 2011 Industrial Revenue Bonds issued by JEDA, the proceeds of which were loaned to subsidiary
Long-term Debt
Face amount of debt issued																						$ 250	$ 250
Stated interest rate (as a percent)																						4.125%	4.35%	6.25%
Retirement of debt																								250
Lines of credit:
Committed long-term line of credit, Total	1,500														300	300	1,100	1,100	400	100	100
Outstanding commercial paper (270 or fewer days)															131	39	512	381		10
Commercial paper, weighted average interest rate (as a percent)															0.63%	0.35%	0.56%	0.42%		0.57%
Commercial paper, maximum term															270 days	270 days
Letters of credit supported by LOC															3.0	3.0	0.3	0.3
Available amount under lines of credit															166	258	588	719		90	100
Line of credit facilities, term of credit agreements (in years)																									5 years
Percentage of aggregate credit facilities provided by banks		10.00%	10.00%	10.00%	8.00%	8.00%	8.00%	8.00%	8.00%	8.00%	5.30%	5.30%	5.30%	6.00%
Number of other banks (in entities)														3
Face value of Industrial Revenue Bonds issued, proceeds of which were availed as loan																										$ 68.3