XML 25 R39.htm IDEA: XBRL DOCUMENT v2.4.1.9
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
Share data in Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant Accounting Policies      
Undercollected balance fuel $ 46,000,000scg_UndercollectedBalanceFuel    
Unbilled Receivables, Current 186,400,000us-gaap_UnbilledReceivablesCurrent 183,100,000us-gaap_UnbilledReceivablesCurrent  
Goodwill 210,000,000us-gaap_Goodwill 230,000,000us-gaap_Goodwill  
Number of coal fired units to be retired     6scg_NumberOfCoalFiredUnitsToBeRetired
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 2.84%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService 2.93%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService 2.90%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
Public Utilities, Allowance for Funds Used During Construction, Additions 7.20%us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate 6.90%us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate 6.30%us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate
Asset Management and Supply Service Agreements      
Natural gas inventory, carrying amount   22,800,000scg_CarryingAmountOfEnergyRelatedInventoryNaturalGasInStorage  
Property, Plant and Equipment, Net 284,000,000us-gaap_PropertyPlantAndEquipmentNet 317,000,000us-gaap_PropertyPlantAndEquipmentNet  
Accrual period of nuclear refueling charges (in months) 18    
Earnings Per Share      
Weighted Average Shares Outstanding - Basic 141.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 138.7us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 131.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental Common Shares Attributable to Share-based Payment Arrangements and Equity Forward Agreements 0scg_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsAndEquityForwardAgreements 0.4scg_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsAndEquityForwardAgreements 2.2scg_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsAndEquityForwardAgreements
Weighted Average Number of Shares Outstanding, Diluted 141.9us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 139.1us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 133.3us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
SCEG and GENCO [Member]      
Significant Accounting Policies      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 2.84%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_SCEGandGENCOMember
2.94%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_SCEGandGENCOMember
2.91%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_SCEGandGENCOMember
SCE&G      
Significant Accounting Policies      
Maintenance Costs 18,400,000us-gaap_MaintenanceCosts
/ dei_LegalEntityAxis
= scg_ScegMember
   
Environmental Remediation Costs Recognized in Regulatory Assets 35,500,000scg_EnvironmentalRemediationCostsRecognizedInRegulatoryAssets
/ dei_LegalEntityAxis
= scg_ScegMember
   
Undercollected balance fuel 46,000,000scg_UndercollectedBalanceFuel
/ dei_LegalEntityAxis
= scg_ScegMember
   
Decommissioning Liability, Noncurrent 696,800,000us-gaap_DecommissioningLiabilityNoncurrent
/ dei_LegalEntityAxis
= scg_ScegMember
   
Decommissioning safe storage 60    
Unbilled Receivables, Current 115,800,000us-gaap_UnbilledReceivablesCurrent
/ dei_LegalEntityAxis
= scg_ScegMember
111,900,000us-gaap_UnbilledReceivablesCurrent
/ dei_LegalEntityAxis
= scg_ScegMember
 
Utilities Operating Expense, Maintenance 19,400,000us-gaap_UtilitiesOperatingExpenseMaintenance
/ dei_LegalEntityAxis
= scg_ScegMember
18,100,000us-gaap_UtilitiesOperatingExpenseMaintenance
/ dei_LegalEntityAxis
= scg_ScegMember
 
Anount accrued monthly for nuclear fuel outages   1,400,000scg_AnountAccruedMonthlyForNuclearFuelOutages
/ dei_LegalEntityAxis
= scg_ScegMember
1,200,000scg_AnountAccruedMonthlyForNuclearFuelOutages
/ dei_LegalEntityAxis
= scg_ScegMember
Number of coal fired units to be retired     6scg_NumberOfCoalFiredUnitsToBeRetired
/ dei_LegalEntityAxis
= scg_ScegMember
Nuclear refueling outage cost 43,700,000scg_NuclearRefuelingOutageCost
/ dei_LegalEntityAxis
= scg_ScegMember
  32,300,000scg_NuclearRefuelingOutageCost
/ dei_LegalEntityAxis
= scg_ScegMember
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 2.85%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_ScegMember
2.96%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_ScegMember
2.93%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_ScegMember
Public Utilities, Allowance for Funds Used During Construction, Additions 6.50%us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate
/ dei_LegalEntityAxis
= scg_ScegMember
6.90%us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate
/ dei_LegalEntityAxis
= scg_ScegMember
6.30%us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate
/ dei_LegalEntityAxis
= scg_ScegMember
Asset Management and Supply Service Agreements      
Property, Plant and Equipment, Net 67,000,000us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= scg_ScegMember
69,000,000us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= scg_ScegMember
 
Payments to Acquire Investments to be Held in Decommissioning Trust Fund 3,200,000us-gaap_PaymentsToInvestInDecommissioningFund
/ dei_LegalEntityAxis
= scg_ScegMember
   
Genco      
Significant Accounting Policies      
Power Generation Capacity Megawatts 605scg_PowerGenerationCapacityMegawatts
/ dei_LegalEntityAxis
= scg_GencoMember
   
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 2.66%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_GencoMember
2.66%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_GencoMember
2.66%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_GencoMember
Asset Management and Supply Service Agreements      
Property, Plant and Equipment, Net 472,000,000us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= scg_GencoMember
   
CGT [Member]      
Significant Accounting Policies      
Goodwill 20,000,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= scg_CarolinaGasTransmissionMember
   
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 2.11%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_CarolinaGasTransmissionMember
2.19%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_CarolinaGasTransmissionMember
2.09%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_CarolinaGasTransmissionMember
PSNC Energy      
Significant Accounting Policies      
Goodwill 210,000,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= scg_PsncEnergyMember
   
Accumulated Amortization and Write-down, Goodwill 230,000,000scg_WritedownGoodwill
/ dei_LegalEntityAxis
= scg_PsncEnergyMember
   
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 2.98%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_PsncEnergyMember
3.01%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_PsncEnergyMember
3.01%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
/ dei_LegalEntityAxis
= scg_PsncEnergyMember
Asset Management and Supply Service Agreements      
Percentage of natural gas inventory held by counterparties under asset management and supply service agreements (as a percent) 48.00%scg_PercentageOfEnergyRelatedInventoryNaturalGasInStorage
/ dei_LegalEntityAxis
= scg_PsncEnergyMember
48.00%scg_PercentageOfEnergyRelatedInventoryNaturalGasInStorage
/ dei_LegalEntityAxis
= scg_PsncEnergyMember
 
Natural gas inventory, carrying amount 26,100,000scg_CarryingAmountOfEnergyRelatedInventoryNaturalGasInStorage
/ dei_LegalEntityAxis
= scg_PsncEnergyMember
   
Summer Station Unit 1 [Domain]      
Significant Accounting Policies      
Jointly Owned Utility Plant, Proportionate Ownership Share 66.70%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationUnits1and2and3Domain
66.70%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationUnits1and2and3Domain
 
Asset Management and Supply Service Agreements      
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service 1,200,000,000us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationUnits1and2and3Domain
1,100,000,000us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationUnits1and2and3Domain
 
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation 578,300,000us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationUnits1and2and3Domain
566,900,000us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationUnits1and2and3Domain
 
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 199,300,000us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationUnits1and2and3Domain
127,100,000us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationUnits1and2and3Domain
 
Summer Station Unit 1 [Domain] | SCE&G      
Asset Management and Supply Service Agreements      
Accounts Receivable, Net 88,900,000us-gaap_AccountsReceivableNet
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationUnits1and2and3Domain
/ dei_LegalEntityAxis
= scg_ScegMember
75,600,000us-gaap_AccountsReceivableNet
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationUnits1and2and3Domain
/ dei_LegalEntityAxis
= scg_ScegMember
 
Summer Station New Units [Domain]      
Significant Accounting Policies      
Jointly Owned Utility Plant, Proportionate Ownership Share 55.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationNewUnitsDomain
55.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationNewUnitsDomain
 
Asset Management and Supply Service Agreements      
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 2,700,000,000us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationNewUnitsDomain
2,300,000,000us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_SummerStationNewUnitsDomain
 
SCE&G      
Significant Accounting Policies      
Nuclear refueling outage cost $ 29,100,000scg_NuclearRefuelingOutageCost
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_ScegMember
  21,500,000scg_NuclearRefuelingOutageCost
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_ScegMember
Jointly Owned Utility Plant, Proportionate Ownership Share 5.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= scg_ScegMember