DERIVATIVE FINANCIAL INSTRUMENTS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) MMBTU		Dec. 31, 2014 USD ($) MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	58,229,980	[1]	55,733,059	[2]
Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	7,530,000		6,840,000
Retail Gas Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	7,869,000		7,951,000
Energy Marketing [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	42,830,980	[1]	40,942,059	[2]
Energy Related Derivative [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU	38,857,480	[1]	37,495,339	[2]
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	38,857,480		37,495,339
Commodity Contracts
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	19,372,500		18,237,720
Commodity Contracts | Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	7,530,000		6,840,000
Commodity Contracts | Retail Gas Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	7,869,000		7,951,000
Commodity Contracts | Energy Marketing [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	3,973,500		3,446,720
Basis Swap [Member] | Energy Related Derivative [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	1,842,048		933,893
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 1,235.0		$ 1,085.0
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	120.0		124.4
SCE&G | Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,235.0		1,085.0
SCE&G | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 36.4		$ 36.4

[1] (a) Includes an aggregate 1,842,048 MMBTU related to basis swap contracts in Energy Marketing.

[2] (b) Includes an aggregate 933,893 MMBTU related to basis swap contracts in Energy Marketing.