DERIVATIVE FINANCIAL INSTRUMENTS (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($) MMBTU	Dec. 31, 2014 USD ($) MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	57,812,862	55,733,059
Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	10,170,000	6,840,000
Retail Gas Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	8,290,000	7,951,000
Energy Marketing [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	39,352,862	40,942,059
Commodity Contract
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	22,162,627	18,237,720
Commodity Contract | Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	10,170,000	6,840,000
Commodity Contract | Retail Gas Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	8,290,000	7,951,000
Commodity Contract | Energy Marketing [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	3,702,627	3,446,720
Energy Related Derivative [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU	35,650,235	37,495,339
Energy Related Derivative [Member] | Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0	0
Energy Related Derivative [Member] | Retail Gas Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0	0
Energy Related Derivative [Member] | Energy Marketing [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	35,650,235	37,495,339
Energy Related Derivative [Member] | Basis Swap [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	2,201,175	933,893
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount	$ 835.0	$ 1,100.0
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount	120.0	124.4
SCEG | Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount	835.0	1,100.0
SCEG | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount	$ 36.4	$ 36.4