DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013 MMBTU		Dec. 31, 2012 MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	53,213,558	[1]	48,300,275	[2]
Nonmonetary Notional Amount of Basis Swap, Price Risk Derivative Instruments Not Designated as Hedging Instruments	674,308		3,500,000
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount	$ 663.8		$ 1,100.0
Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	8,820,000		5,170,000
Retail Gas Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	10,407,000		6,490,000
Energy Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	33,986,558	[1]	36,640,275	[2]
Commodity Contract
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	22,305,500		16,537,000
Commodity Contract | Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	8,820,000		5,170,000
Commodity Contract | Retail Gas Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	10,407,000		6,490,000
Commodity Contract | Energy Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	3,078,500		4,877,000
Energy Management Contracts [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	30,908,058		31,763,275
Energy Management Contracts [Member] | Energy Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	30,908,058		31,763,275
SCEG
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount	$ 571.4		$ 971.4

[1] (a) Includes an aggregate 674,308 MMBTU related to basis swap contracts in Energy Marketing.

[2] (b) Includes an aggregate 3,500,000 MMBTU related to basis swap contracts in Energy Marketing.