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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash Flows From Operating Activities:    
Net Income (Loss) Available to Common Stockholders, Basic $ 400us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 193us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile net income to net cash provided from operating activities:    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal (353)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal  
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions 1us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions 1us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
Deferred Income Tax Expense (Benefit) (74)us-gaap_DeferredIncomeTaxExpenseBenefit 7us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization 100us-gaap_DepreciationAmortizationAndAccretionNet 99us-gaap_DepreciationAmortizationAndAccretionNet
Amortization of nuclear fuel 13scg_AmortizationOfNuclearFuel 15scg_AmortizationOfNuclearFuel
Allowance for equity funds used during construction (5)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity (7)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Carrying cost recovery (3)scg_CarryingCostRecovery (2)scg_CarryingCostRecovery
Cash provided (used) by changes in certain assets and liabilities:    
Receivables 33us-gaap_IncreaseDecreaseInReceivables (56)us-gaap_IncreaseDecreaseInReceivables
Inventories 31us-gaap_IncreaseDecreaseInInventories 70us-gaap_IncreaseDecreaseInInventories
Increase (Decrease) in Prepaid Expense (218)us-gaap_IncreaseDecreaseInPrepaidExpense (12)us-gaap_IncreaseDecreaseInPrepaidExpense
Increase (Decrease) in Other Regulatory Assets (68)us-gaap_IncreaseDecreaseInOtherRegulatoryAssets (108)us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
Regulatory liabilities 6us-gaap_IncreaseDecreaseInRegulatoryLiabilities (94)us-gaap_IncreaseDecreaseInRegulatoryLiabilities
Accounts payable (67)us-gaap_IncreaseDecreaseInAccountsPayable 29us-gaap_IncreaseDecreaseInAccountsPayable
Taxes accrued (71)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (143)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Interest accrued (7)us-gaap_IncreaseDecreaseInInterestPayableNet (7)us-gaap_IncreaseDecreaseInInterestPayableNet
Increase (Decrease) in Pension and Postretirement Obligations (1)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations (2)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
Increase (Decrease) in Derivative Assets and Liabilities 59us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities 39us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities
Changes in other assets (6)us-gaap_IncreaseDecreaseInOtherOperatingAssets 11us-gaap_IncreaseDecreaseInOtherOperatingAssets
Changes in other liabilities (11)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 81us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net Cash Provided From Operating Activities 195us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 138us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows From Investing Activities:    
Property additions and construction expenditures (352)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (289)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from Sale of Property, Plant, and Equipment 645us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment  
Proceeds from investments (including derivative collateral posted) 318scg_ProceedsFromSaleOfInvestmentsAndProductiveAssets 16scg_ProceedsFromSaleOfInvestmentsAndProductiveAssets
Purchase of investments (including derivative collateral posted) (400)us-gaap_PaymentsToAcquireInvestments (22)us-gaap_PaymentsToAcquireInvestments
Net Cash Used in Investing Activities 211us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (295)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows From Financing Activities:    
Proceeds from Issuance of Common Stock 14us-gaap_ProceedsFromIssuanceOfCommonStock 22us-gaap_ProceedsFromIssuanceOfCommonStock
Repayments of Long-term Debt (158)us-gaap_RepaymentsOfLongTermDebt (9)us-gaap_RepaymentsOfLongTermDebt
Dividends (75)us-gaap_PaymentsOfDividends (66)us-gaap_PaymentsOfDividends
Short-term borrowings, net (293)us-gaap_ProceedsFromRepaymentsOfShortTermDebt 184us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Net Cash Provided From Financing Activities (512)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 131us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net (Decrease) Increase in Cash and Cash Equivalents (106)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (26)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents, January 1 137us-gaap_CashAndCashEquivalentsAtCarryingValue 136us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents, March 31 31us-gaap_CashAndCashEquivalentsAtCarryingValue 110us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Cash Flow Information:    
Cash paid for-Interest (net of capitalized interest ) 81us-gaap_InterestPaidNet 80us-gaap_InterestPaidNet
Cash paid for-Income taxes 8us-gaap_IncomeTaxesPaidNet 100us-gaap_IncomeTaxesPaidNet
Noncash Investing and Financing Activities:    
Accrued construction expenditures 84us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid 77us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid
Capital Lease Obligations Incurred 2us-gaap_CapitalLeaseObligationsIncurred 1us-gaap_CapitalLeaseObligationsIncurred
SCEG    
Cash Flows From Operating Activities:    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 126us-gaap_ProfitLoss
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126us-gaap_ProfitLoss
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Adjustments to reconcile net income to net cash provided from operating activities:    
Income (Loss) from Equity Method Investments 1us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= scg_ScegMember
1us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
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Deferred Income Tax Expense (Benefit) 7us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= scg_ScegMember
5us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= scg_ScegMember
Depreciation and amortization 82us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= scg_ScegMember
78us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= scg_ScegMember
Amortization of nuclear fuel 13scg_AmortizationOfNuclearFuel
/ dei_LegalEntityAxis
= scg_ScegMember
15scg_AmortizationOfNuclearFuel
/ dei_LegalEntityAxis
= scg_ScegMember
Allowance for equity funds used during construction (5)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
/ dei_LegalEntityAxis
= scg_ScegMember
(5)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
/ dei_LegalEntityAxis
= scg_ScegMember
Carrying cost recovery (3)scg_CarryingCostRecovery
/ dei_LegalEntityAxis
= scg_ScegMember
(2)scg_CarryingCostRecovery
/ dei_LegalEntityAxis
= scg_ScegMember
Cash provided (used) by changes in certain assets and liabilities:    
Receivables 22us-gaap_IncreaseDecreaseInReceivables
/ dei_LegalEntityAxis
= scg_ScegMember
(23)us-gaap_IncreaseDecreaseInReceivables
/ dei_LegalEntityAxis
= scg_ScegMember
Inventories 0us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= scg_ScegMember
19us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= scg_ScegMember
Increase (Decrease) in Prepaid Expense (75)us-gaap_IncreaseDecreaseInPrepaidExpense
/ dei_LegalEntityAxis
= scg_ScegMember
(7)us-gaap_IncreaseDecreaseInPrepaidExpense
/ dei_LegalEntityAxis
= scg_ScegMember
Increase (Decrease) in Other Regulatory Assets (74)us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
/ dei_LegalEntityAxis
= scg_ScegMember
(107)us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
/ dei_LegalEntityAxis
= scg_ScegMember
Regulatory liabilities 6us-gaap_IncreaseDecreaseInRegulatoryLiabilities
/ dei_LegalEntityAxis
= scg_ScegMember
(94)us-gaap_IncreaseDecreaseInRegulatoryLiabilities
/ dei_LegalEntityAxis
= scg_ScegMember
Accounts payable (20)us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= scg_ScegMember
27us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= scg_ScegMember
Taxes accrued (50)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
/ dei_LegalEntityAxis
= scg_ScegMember
(127)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
/ dei_LegalEntityAxis
= scg_ScegMember
Interest accrued (7)us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= scg_ScegMember
(11)us-gaap_IncreaseDecreaseInInterestPayableNet
/ dei_LegalEntityAxis
= scg_ScegMember
Increase (Decrease) in Pension and Postretirement Obligations 22us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
/ dei_LegalEntityAxis
= scg_ScegMember
(2)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
/ dei_LegalEntityAxis
= scg_ScegMember
Increase (Decrease) in Derivative Assets and Liabilities 81us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities
/ dei_LegalEntityAxis
= scg_ScegMember
40us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities
/ dei_LegalEntityAxis
= scg_ScegMember
Changes in other assets (3)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= scg_ScegMember
15us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= scg_ScegMember
Changes in other liabilities (49)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= scg_ScegMember
81us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= scg_ScegMember
Net Cash Provided From Operating Activities 224us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= scg_ScegMember
43us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= scg_ScegMember
Cash Flows From Investing Activities:    
Property additions and construction expenditures (319)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= scg_ScegMember
(260)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= scg_ScegMember
Proceeds from investments (including derivative collateral posted) 274scg_ProceedsFromSaleOfInvestmentsAndProductiveAssets
/ dei_LegalEntityAxis
= scg_ScegMember
4scg_ProceedsFromSaleOfInvestmentsAndProductiveAssets
/ dei_LegalEntityAxis
= scg_ScegMember
Purchase of investments (including derivative collateral posted) (356)us-gaap_PaymentsToAcquireInvestments
/ dei_LegalEntityAxis
= scg_ScegMember
(9)us-gaap_PaymentsToAcquireInvestments
/ dei_LegalEntityAxis
= scg_ScegMember
Investment In Affiliate 80scg_InvestmentInAffiliate
/ dei_LegalEntityAxis
= scg_ScegMember
 
Net Cash Used in Investing Activities (321)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= scg_ScegMember
(265)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= scg_ScegMember
Cash Flows From Financing Activities:    
Repayments of Long-term Debt (8)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= scg_ScegMember
(9)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= scg_ScegMember
Dividends (74)us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= scg_ScegMember
(62)us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= scg_ScegMember
Contributions from parent (4)us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= scg_ScegMember
20us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= scg_ScegMember
Short-term borrowings, net (99)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= scg_ScegMember
206us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= scg_ScegMember
Short-term borrowings-affiliate,net 192scg_ProceedsFromRepaymentsOfShorttermBorrowingsAffiliatenet
/ dei_LegalEntityAxis
= scg_ScegMember
7scg_ProceedsFromRepaymentsOfShorttermBorrowingsAffiliatenet
/ dei_LegalEntityAxis
= scg_ScegMember
Net Cash Provided From Financing Activities 7us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= scg_ScegMember
162us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= scg_ScegMember
Net (Decrease) Increase in Cash and Cash Equivalents (90)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= scg_ScegMember
(60)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= scg_ScegMember
Cash and Cash Equivalents, January 1 100us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= scg_ScegMember
92us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= scg_ScegMember
Cash and Cash Equivalents, March 31 10us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= scg_ScegMember
32us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
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Supplemental Cash Flow Information:    
Cash paid for-Interest (net of capitalized interest ) 62us-gaap_InterestPaidNet
/ dei_LegalEntityAxis
= scg_ScegMember
62us-gaap_InterestPaidNet
/ dei_LegalEntityAxis
= scg_ScegMember
Cash paid for-Income taxes (83)us-gaap_IncomeTaxesPaidNet
/ dei_LegalEntityAxis
= scg_ScegMember
59us-gaap_IncomeTaxesPaidNet
/ dei_LegalEntityAxis
= scg_ScegMember
Noncash Investing and Financing Activities:    
Accrued construction expenditures 76us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid
/ dei_LegalEntityAxis
= scg_ScegMember
97us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid
/ dei_LegalEntityAxis
= scg_ScegMember
Capital Lease Obligations Incurred $ 2us-gaap_CapitalLeaseObligationsIncurred
/ dei_LegalEntityAxis
= scg_ScegMember
$ 1us-gaap_CapitalLeaseObligationsIncurred
/ dei_LegalEntityAxis
= scg_ScegMember