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DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
MMBTU
Dec. 31, 2013
MMBTU
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 55,733,059invest_DerivativeNonmonetaryNotionalAmount [1] 42,715,958invest_DerivativeNonmonetaryNotionalAmount [2]
Gas Distribution    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 6,840,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_StatementBusinessSegmentsAxis
= scg_GasDistributionSegmentMemberMember		 6,070,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_StatementBusinessSegmentsAxis
= scg_GasDistributionSegmentMemberMember
Retail Gas Marketing    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 7,951,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_StatementBusinessSegmentsAxis
= scg_RetailGasMarketingSegmentMemberMember		 6,726,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_StatementBusinessSegmentsAxis
= scg_RetailGasMarketingSegmentMemberMember
Energy Marketing [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 40,942,059invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_StatementBusinessSegmentsAxis
= scg_EnergyMarketingMember		 [1] 29,919,958invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_StatementBusinessSegmentsAxis
= scg_EnergyMarketingMember		 [2]
Energy Related Derivative [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 37,495,339invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember		 [1] 27,359,958invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember		 [2]
Energy Related Derivative [Member] | Gas Distribution    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 0invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_GasDistributionSegmentMemberMember		 0invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_GasDistributionSegmentMemberMember
Energy Related Derivative [Member] | Retail Gas Marketing    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 0invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_RetailGasMarketingSegmentMemberMember		 0invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_RetailGasMarketingSegmentMemberMember
Energy Related Derivative [Member] | Energy Marketing [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 37,495,339invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_EnergyMarketingMember		 27,359,958invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_EnergyMarketingMember
Commodity Contracts    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 18,237,720invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 15,356,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Commodity Contracts | Gas Distribution    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 6,840,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_GasDistributionSegmentMemberMember		 6,070,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_GasDistributionSegmentMemberMember
Commodity Contracts | Retail Gas Marketing    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 7,951,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_RetailGasMarketingSegmentMemberMember		 6,726,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_RetailGasMarketingSegmentMemberMember
Commodity Contracts | Energy Marketing [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 3,446,720invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_EnergyMarketingMember		 2,560,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_StatementBusinessSegmentsAxis
= scg_EnergyMarketingMember
Basis Swap [Member] | Energy Related Derivative [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Energy Measure 933,893us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember
/ us-gaap_EnergyAxis
= us-gaap_BasisSwapMember		 348,453us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember
/ us-gaap_EnergyAxis
= us-gaap_BasisSwapMember
Not Designated as Hedging Instrument [Member] | Interest Rate Contract    
Derivative [Line Items]    
Derivative, Notional Amount 1,100.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 1,300.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract    
Derivative [Line Items]    
Derivative, Notional Amount 124.4invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 128.8invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
SCE&G | Not Designated as Hedging Instrument [Member] | Interest Rate Contract    
Derivative [Line Items]    
Derivative, Notional Amount 1,100.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= scg_ScegMember		 1,300.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ dei_LegalEntityAxis
= scg_ScegMember
SCE&G | Cash Flow Hedging [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative, Notional Amount 36.4invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ dei_LegalEntityAxis
= scg_ScegMember		 36.4invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ dei_LegalEntityAxis
= scg_ScegMember
[1] (a) Includes an aggregate 933,893 MMBTU related to basis swap contracts in Energy Marketing.
[2] (b) Includes an aggregate 348,453 MMBTU related to basis swap contracts in Energy Marketing.