LONG-TERM AND SHORT-TERM DEBT (Details 2) (USD $) In Millions, unless otherwise specified			12 Months Ended																3 Months Ended					3 Months Ended					3 Months Ended		3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 SCE&G	Sep. 30, 2012 SCE&G	Dec. 31, 2011 SCE&G	Dec. 31, 2012 Parent Company [Member]	Sep. 30, 2012 Parent Company [Member]	Dec. 31, 2011 Parent Company [Member]	Sep. 30, 2012 Retail Gas Marketing and Energy Marketing	Dec. 31, 2011 Retail Gas Marketing and Energy Marketing	Dec. 31, 2012 SCE&G (including Fuel Company)	Dec. 31, 2011 SCE&G (including Fuel Company)	Dec. 31, 2012 SCE&G (including Fuel Company) Wells Fargo Bank, National Association (Member)	Dec. 31, 2012 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)	Sep. 30, 2012 Fuel Company	Dec. 31, 2012 First Mortgage Bonds [Member]	Dec. 31, 2011 First Mortgage Bonds [Member]	Sep. 30, 2012 First Mortgage Bonds [Member] SCE&G	Mar. 31, 2012 First Mortgage Bonds [Member] SCE&G	Dec. 31, 2012 First Mortgage Bonds [Member] SCE&G	Dec. 31, 2011 First Mortgage Bonds [Member] SCE&G	Feb. 28, 2011 First Mortgage Bonds [Member] SCE&G	Sep. 30, 2012 Medium Term Notes First [Member]	Sep. 30, 2012 Medium Term Notes First [Member] SCE and G [Member]	Dec. 31, 2012 Medium-term Notes [Member]	Sep. 30, 2012 Medium-term Notes [Member]	Dec. 31, 2011 Medium-term Notes [Member]	Mar. 31, 2013 Industrial Revenue Bonds issued by JEDA, the proceeds of which were loaned to subsidiary	Jan. 31, 2013 Industrial Revenue Bonds issued by JEDA, the proceeds of which were loaned to subsidiary	Mar. 31, 2013 Industrial and Pollution Control Bonds [Member]	Jan. 31, 2013 Industrial and Pollution Control Bonds [Member]	Dec. 31, 2012 Industrial and Pollution Control Bonds [Member]	Dec. 31, 2011 Industrial and Pollution Control Bonds [Member]	Dec. 31, 2012 Industrial and Pollution Control Bonds [Member] SCE&G	Dec. 31, 2011 Industrial and Pollution Control Bonds [Member] SCE&G	Jan. 31, 2013 Bonds [Member]
Debt Instrument [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	$ 49.4	$ 58.5
Long-term Debt, Percentage Bearing Variable Interest, Amount			67.8		71.4																							250.0
Long-term Debt, Current Maturities	172	31	165		19
Long-term Debt, Maturities, Repayments of Principal in Year Two	53		48
Due to Affiliate, Current			124.0		136.0				13.1	13.2
Debt Instruments [Abstract]
Debt Instrument, Increase, Additional Borrowings																			250.0	250.0				250.0	250.0				39.5		14.7
Debt Instrument, Interest Rate, Stated Percentage																			4.35%				4.35%	4.125%			6.25%			4.00%		5.20%					3.63%
Debt Instrument, Decrease, Repayments																															56.9
Face value of Industrial Revenue Bonds issued, proceeds of which were availed as loan			67.8
Unfunded property additions	70.00%
Consecutive months for bond ratio			12
months preceding issuance of bonds			18
Lines of credit:
Line of Credit Facility, Maximum Borrowing Capacity	1,800			1,200		300	300	300			1,400	1,100				500
Commercial Paper						142		131			449	512
Commercial paper, weighted average interest rate (as a percent)						0.58%		0.63%			0.42%	0.56%					5.66%	5.89%			5.66%	5.89%				5.02%		5.69%					4.32%	4.48%	4.32%	4.48%
Letters of credit supported by LOC						3.0		3.0			0	0
Line of Credit Facility, Remaining Borrowing Capacity						155		166			951	588
LOC advances						0		0			0	0
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank													10.70%	6.30%	8.90%
Number of other banks (in entities)				2
3 year credit agreement			200
Long-term Debt, Maturities, Repayments of Principal in Year Three	14		9
Long-term Debt, Maturities, Repayments of Principal in Year Four	13		8
Long-term Debt, Maturities, Repayments of Principal in Year Five	$ 12		$ 8
Bond Ratio			5.22