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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net Income (Loss) Available to Common Stockholders, Basic $ 538us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 471us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 420us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile net income to net cash provided from operating activities:      
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions 5us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions 7us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions 0us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
Deferred income taxes, net 235scg_DeferredIncomeTaxNoncashExpenseBenefit 49scg_DeferredIncomeTaxNoncashExpenseBenefit 130scg_DeferredIncomeTaxNoncashExpenseBenefit
Depreciation and amortization 403us-gaap_DepreciationAmortizationAndAccretionNet 393us-gaap_DepreciationAmortizationAndAccretionNet 368us-gaap_DepreciationAmortizationAndAccretionNet
Amortization of nuclear fuel 45scg_AmortizationOfNuclearFuel 57scg_AmortizationOfNuclearFuel 44scg_AmortizationOfNuclearFuel
Allowance for equity funds used during construction (33)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity (27)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity (21)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Carrying cost recovery (9.0)scg_CarryingCostRecovery (3.0)scg_CarryingCostRecovery 0scg_CarryingCostRecovery
Cash provided (used) by changes in certain assets and liabilities:      
Receivables (33)us-gaap_IncreaseDecreaseInReceivables (38)us-gaap_IncreaseDecreaseInReceivables 5us-gaap_IncreaseDecreaseInReceivables
Inventories (62)us-gaap_IncreaseDecreaseInInventories 21us-gaap_IncreaseDecreaseInInventories (53)us-gaap_IncreaseDecreaseInInventories
Increase (Decrease) in Prepaid Expense 235us-gaap_IncreaseDecreaseInPrepaidExpense (49)us-gaap_IncreaseDecreaseInPrepaidExpense (26)us-gaap_IncreaseDecreaseInPrepaidExpense
Increase (Decrease) in Other Regulatory Assets (372)us-gaap_IncreaseDecreaseInOtherRegulatoryAssets 113us-gaap_IncreaseDecreaseInOtherRegulatoryAssets (172)us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
Regulatory liabilities (133)us-gaap_IncreaseDecreaseInRegulatoryLiabilities 56us-gaap_IncreaseDecreaseInRegulatoryLiabilities 62us-gaap_IncreaseDecreaseInRegulatoryLiabilities
Accounts payable 36us-gaap_IncreaseDecreaseInAccountsPayable 24us-gaap_IncreaseDecreaseInAccountsPayable 34us-gaap_IncreaseDecreaseInAccountsPayable
Taxes accrued (24)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 42us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 10us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Increase (Decrease) in Pension and Postretirement Obligations 133us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations (217)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations 89us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
Increase (Decrease) in Derivative Assets and Liabilities 225us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities (72)us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities 3us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities
Changes in other assets (8)us-gaap_IncreaseDecreaseInOtherOperatingAssets 17us-gaap_IncreaseDecreaseInOtherOperatingAssets (143)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Changes in other liabilities 19us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 108us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 37us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net Cash Provided from Operating Activities 730us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 1,050us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 839us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows From Investing Activities      
Property additions and construction expenditures (1,092)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,106)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,077)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from investments (including derivative collateral posted) 347scg_ProceedsFromSaleOfInvestmentsAndProductiveAssets 222scg_ProceedsFromSaleOfInvestmentsAndProductiveAssets 472scg_ProceedsFromSaleOfInvestmentsAndProductiveAssets
Purchase of investments (including derivative collateral posted) (475)us-gaap_PaymentsToAcquireInvestments (176)us-gaap_PaymentsToAcquireInvestments (414)us-gaap_PaymentsToAcquireInvestments
Payments upon interest rate contract settlement (95)us-gaap_PaymentsForHedgeInvestingActivities (49)us-gaap_PaymentsForHedgeInvestingActivities (51)us-gaap_PaymentsForHedgeInvestingActivities
Payments for (Proceeds from) Hedge, Investing Activities 0us-gaap_PaymentsForProceedsFromHedgeInvestingActivities 163us-gaap_PaymentsForProceedsFromHedgeInvestingActivities 14us-gaap_PaymentsForProceedsFromHedgeInvestingActivities
Net Cash Used for Investing Activities (1,315)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (946)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,056)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows from Financing Activities      
Proceeds from Issuance of Common Stock 98us-gaap_ProceedsFromIssuanceOfCommonStock 295us-gaap_ProceedsFromIssuanceOfCommonStock 97us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from issuance of long-term debt 294us-gaap_ProceedsFromIssuanceOfLongTermDebt 451us-gaap_ProceedsFromIssuanceOfLongTermDebt 759us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repayments of Long-term Debt (54)us-gaap_RepaymentsOfLongTermDebt (258)us-gaap_RepaymentsOfLongTermDebt (309)us-gaap_RepaymentsOfLongTermDebt
Dividends (294)us-gaap_PaymentsOfDividends (281)us-gaap_PaymentsOfDividends (257)us-gaap_PaymentsOfDividends
Short-term borrowings, net 542us-gaap_ProceedsFromRepaymentsOfShortTermDebt (247)us-gaap_ProceedsFromRepaymentsOfShortTermDebt (30)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Net Cash Provided From Financing Activities 586us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (40)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 260us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net (Decrease) Increase in Cash and Cash Equivalents 1us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 64us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 43us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents, January 1 136us-gaap_CashAndCashEquivalentsAtCarryingValue 72us-gaap_CashAndCashEquivalentsAtCarryingValue 29us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents, December 31 137us-gaap_CashAndCashEquivalentsAtCarryingValue 136us-gaap_CashAndCashEquivalentsAtCarryingValue 72us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Cash Flow Information      
Cash paid for-Interest (net of capitalized interest ) 301us-gaap_InterestPaidNet 288us-gaap_InterestPaidNet 281us-gaap_InterestPaidNet
Cash paid for-Income taxes 299us-gaap_IncomeTaxesPaidNet 104us-gaap_IncomeTaxesPaidNet 107us-gaap_IncomeTaxesPaidNet
Cash Flow, Noncash Investing and Financing Activities Disclosure      
Accrued construction expenditures 180us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid 111us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid 124us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid
Capital Lease Obligations Incurred 5us-gaap_CapitalLeaseObligationsIncurred 6us-gaap_CapitalLeaseObligationsIncurred 8us-gaap_CapitalLeaseObligationsIncurred
Noncash or Part Noncash Acquisition, Fixed Assets Acquired   98us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1  
SCE&G      
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 458us-gaap_ProfitLoss
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391us-gaap_ProfitLoss
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352us-gaap_ProfitLoss
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Adjustments to reconcile net income to net cash provided from operating activities:      
Income (Loss) from Equity Method Investments 5us-gaap_IncomeLossFromEquityMethodInvestments
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3us-gaap_IncomeLossFromEquityMethodInvestments
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4us-gaap_IncomeLossFromEquityMethodInvestments
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Deferred income taxes, net 187scg_DeferredIncomeTaxNoncashExpenseBenefit
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29scg_DeferredIncomeTaxNoncashExpenseBenefit
/ dei_LegalEntityAxis
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116scg_DeferredIncomeTaxNoncashExpenseBenefit
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Depreciation and amortization 318us-gaap_DepreciationAmortizationAndAccretionNet
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315us-gaap_DepreciationAmortizationAndAccretionNet
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294us-gaap_DepreciationAmortizationAndAccretionNet
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Amortization of nuclear fuel 45scg_AmortizationOfNuclearFuel
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57scg_AmortizationOfNuclearFuel
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44scg_AmortizationOfNuclearFuel
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= scg_ScegMember
Allowance for equity funds used during construction (28)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
/ dei_LegalEntityAxis
= scg_ScegMember
(25)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
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= scg_ScegMember
(21)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
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Carrying cost recovery (9.0)scg_CarryingCostRecovery
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(2.9)scg_CarryingCostRecovery
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= scg_ScegMember
0scg_CarryingCostRecovery
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Cash provided (used) by changes in certain assets and liabilities:      
Receivables (39)us-gaap_IncreaseDecreaseInReceivables
/ dei_LegalEntityAxis
= scg_ScegMember
(36)us-gaap_IncreaseDecreaseInReceivables
/ dei_LegalEntityAxis
= scg_ScegMember
35us-gaap_IncreaseDecreaseInReceivables
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= scg_ScegMember
Inventories (52)us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= scg_ScegMember
35us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= scg_ScegMember
(60)us-gaap_IncreaseDecreaseInInventories
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= scg_ScegMember
Increase (Decrease) in Prepaid Expense 89us-gaap_IncreaseDecreaseInPrepaidExpense
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= scg_ScegMember
(8)us-gaap_IncreaseDecreaseInPrepaidExpense
/ dei_LegalEntityAxis
= scg_ScegMember
(6)us-gaap_IncreaseDecreaseInPrepaidExpense
/ dei_LegalEntityAxis
= scg_ScegMember
Increase (Decrease) in Other Regulatory Assets (350)us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
/ dei_LegalEntityAxis
= scg_ScegMember
83us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
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(158)us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
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Regulatory liabilities (132)us-gaap_IncreaseDecreaseInRegulatoryLiabilities
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54us-gaap_IncreaseDecreaseInRegulatoryLiabilities
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= scg_ScegMember
64us-gaap_IncreaseDecreaseInRegulatoryLiabilities
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Accounts payable 14us-gaap_IncreaseDecreaseInAccountsPayable
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5us-gaap_IncreaseDecreaseInAccountsPayable
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27us-gaap_IncreaseDecreaseInAccountsPayable
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Taxes accrued (53)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
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72us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
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1us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
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Increase (Decrease) in Pension and Postretirement Obligations 106us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
/ dei_LegalEntityAxis
= scg_ScegMember
(186)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
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69us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
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Increase (Decrease) in Derivative Assets and Liabilities 207us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities
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= scg_ScegMember
(65)us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities
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64us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities
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Changes in other assets 12us-gaap_IncreaseDecreaseInOtherOperatingAssets
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27us-gaap_IncreaseDecreaseInOtherOperatingAssets
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(154)us-gaap_IncreaseDecreaseInOtherOperatingAssets
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Changes in other liabilities 41us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
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88us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
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(9)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
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Net Cash Provided from Operating Activities 641us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
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= scg_ScegMember
852us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
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674us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
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Cash Flows From Investing Activities      
Property additions and construction expenditures (934)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
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(1,003)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
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(978)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
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= scg_ScegMember
Proceeds from investments (including derivative collateral posted) 275scg_ProceedsFromSaleOfInvestmentsAndProductiveAssets
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144scg_ProceedsFromSaleOfInvestmentsAndProductiveAssets
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275scg_ProceedsFromSaleOfInvestmentsAndProductiveAssets
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Purchase of investments (including derivative collateral posted) (381)us-gaap_PaymentsToAcquireInvestments
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(116)us-gaap_PaymentsToAcquireInvestments
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(268)us-gaap_PaymentsToAcquireInvestments
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Payments upon interest rate contract settlement (95)us-gaap_PaymentsForHedgeInvestingActivities
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(49)us-gaap_PaymentsForHedgeInvestingActivities
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0us-gaap_PaymentsForHedgeInvestingActivities
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Payments for (Proceeds from) Hedge, Investing Activities 0us-gaap_PaymentsForProceedsFromHedgeInvestingActivities
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163us-gaap_PaymentsForProceedsFromHedgeInvestingActivities
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14us-gaap_PaymentsForProceedsFromHedgeInvestingActivities
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Investment In Affiliate (80)scg_InvestmentInAffiliate
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0scg_InvestmentInAffiliate
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0scg_InvestmentInAffiliate
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Net Cash Used for Investing Activities (1,215)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
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(861)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
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(957)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
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Cash Flows from Financing Activities      
Proceeds from issuance of long-term debt 294us-gaap_ProceedsFromIssuanceOfLongTermDebt
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451us-gaap_ProceedsFromIssuanceOfLongTermDebt
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513us-gaap_ProceedsFromIssuanceOfLongTermDebt
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Repayments of Long-term Debt (48)us-gaap_RepaymentsOfLongTermDebt
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(251)us-gaap_RepaymentsOfLongTermDebt
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(49)us-gaap_RepaymentsOfLongTermDebt
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Dividends (260)us-gaap_PaymentsOfDividends
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(241)us-gaap_PaymentsOfDividends
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(202)us-gaap_PaymentsOfDividends
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Short-term borrowings, net 458us-gaap_ProceedsFromRepaymentsOfShortTermDebt
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(198)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
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(63)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
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Short-term borrowings-affiliate,net 56scg_ProceedsFromRepaymentsOfShorttermBorrowingsAffiliatenet
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(22)scg_ProceedsFromRepaymentsOfShorttermBorrowingsAffiliatenet
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(9)scg_ProceedsFromRepaymentsOfShorttermBorrowingsAffiliatenet
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Contributions from parent 82us-gaap_ProceedsFromContributionsFromParent
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311us-gaap_ProceedsFromContributionsFromParent
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128us-gaap_ProceedsFromContributionsFromParent
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Net Cash Provided From Financing Activities 582us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
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50us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
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318us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
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Net (Decrease) Increase in Cash and Cash Equivalents 8us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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41us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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35us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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Cash and Cash Equivalents, January 1 92us-gaap_CashAndCashEquivalentsAtCarryingValue
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51us-gaap_CashAndCashEquivalentsAtCarryingValue
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16us-gaap_CashAndCashEquivalentsAtCarryingValue
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Cash and Cash Equivalents, December 31 100us-gaap_CashAndCashEquivalentsAtCarryingValue
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92us-gaap_CashAndCashEquivalentsAtCarryingValue
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51us-gaap_CashAndCashEquivalentsAtCarryingValue
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Supplemental Cash Flow Information      
Cash paid for-Interest (net of capitalized interest ) 210us-gaap_InterestPaidNet
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200us-gaap_InterestPaidNet
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186us-gaap_InterestPaidNet
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Cash paid for-Income taxes 177us-gaap_IncomeTaxesPaidNet
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92us-gaap_IncomeTaxesPaidNet
/ dei_LegalEntityAxis
= scg_ScegMember
105us-gaap_IncomeTaxesPaidNet
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Cash Flow, Noncash Investing and Financing Activities Disclosure      
Accrued construction expenditures 151us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid
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100us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid
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116us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid
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Capital Lease Obligations Incurred 5us-gaap_CapitalLeaseObligationsIncurred
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4us-gaap_CapitalLeaseObligationsIncurred
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8us-gaap_CapitalLeaseObligationsIncurred
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Noncash or Part Noncash Acquisition, Fixed Assets Acquired   $ 98us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1
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