DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015 MMBTU	Dec. 31, 2014 MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	60,113,497	55,733,059
Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	10,140,000	6,840,000
Retail Gas Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	5,633,000	7,951,000
Energy Marketing [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	44,340,497	40,942,059
Commodity Contract
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	19,301,964	18,237,720
Commodity Contract \| Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	10,140,000	6,840,000
Commodity Contract \| Retail Gas Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	5,633,000	7,951,000
Commodity Contract \| Energy Marketing [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	3,528,964	3,446,720
Energy Related Derivative [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	40,811,533	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	40,811,533	37,495,339
Energy Related Derivative [Member] \| Basis Swap [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure	3,148,404	933,893
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount	1,300.0	1,100.0
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount	124.4	124.4
SCEG \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount	1,300.0	1,100.0
SCEG \| Cash Flow Hedging [Member] \| Interest Rate Swap [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount	36.4	36.4

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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