Income Statement [Abstract] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] SCE&G SCE&G [member] Represents South Carolina Electric and Gas Company, a wholly owned subsidiary of the entity. Statement [Line Items] Statement [Line Items] Operating Revenues: Revenues [Abstract] Electric Domestic Regulated Revenue Electric Domestic Regulated Revenue Gas-regulated Regulated Operating Revenue, Gas Gas-nonregulated Unregulated Operating Revenue Total Operating Revenues Regulated Operating Revenue Regulated and Unregulated Operating Revenue Regulated and Unregulated Operating Revenue Operating Expenses [Abstract] Operating Expenses [Abstract] Fuel used in electric generation Utilities Operating Expense, Fuel Used Purchased power Utilities Operating Expense, Purchased Power Gas purchased for resale Cost of Purchased Oil and Gas Other operation and maintenance Utilities Operating Expense, Maintenance and Operations Depreciation and amortization Utilities Operating Expense, Depreciation and Amortization Other taxes Utilities Operating Expense, Taxes Total Operating Expenses Utilities Operating Expense Operating Income Operating Income (Loss) Other Income (Expense): Nonoperating Income (Expense) [Abstract] Other income Other Nonoperating Income Other expenses Other Nonoperating Expense Interest charges, net of allowance for borrowed funds used during construction of $2, $2 Interest Expense Allowance for equity funds used during construction Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Total Other Expense Nonoperating Income (Expense) Income Before Income Tax Expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income Tax Expense Income Tax Expense (Benefit) Income Available to Common Shareholders Net Income (Loss) Available to Common Stockholders, Basic Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Parent Less Preferred Stock Dividends of Subsidiary Dividends, Preferred Stock Per Common Share Data Earnings Per Share [Abstract] Basic Earnings Per Share of Common Stock (in dollars per share) Earnings Per Share, Basic Diluted Earnings Per Share of Common Stock (in dollars per share) Earnings Per Share, Diluted Weighted Average Common Shares Outstanding (millions) Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Dividends Declared Per Share of Common Stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Dividends, Common Stock, Cash Dividends, Common Stock, Cash Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value by Measurement Frequency [Axis] Fair Value by Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring basis Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Interest Rate Contract Interest Rate Contract [Member] Commodity contracts Commodity Contract [Member] Other energy management contracts Other energy management contracts [member] [member] [member] [member] Derivative instrument whose primary underlying risk is tied to fixed price supply contracts. Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets, Fair Value Disclosure [Abstract] Assets, Fair Value Disclosure [Abstract] Available-for-sale Securities Available-for-sale Securities Derivative Assets Derivative Assets Liabilities, Fair Value Disclosure [Abstract] Liabilities, Fair Value Disclosure [Abstract] Derivative Financial Instruments, Liabilities, Fair Value Disclosure Derivative Financial Instruments, Liabilities, Fair Value Disclosure Compensation and Retirement Disclosure [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Pension Benefits Pension Plans, Defined Benefit [Member] Other Postretirement Benefits Other Postretirement Benefit Plans, Defined Benefit [Member] Pension and Other Postretirement Benefit Plans Defined Benefit Plan Disclosure [Line Items] Components of Net Periodic Benefit Cost Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on assets Defined Benefit Plan, Expected Return on Plan Assets Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax Defined Benefit Plan, Amortization of Transition Obligations (Assets) Defined Benefit Plan, Amortization of Transition Obligations (Assets) Defined Benefit Plan, Actuarial Net (Gains) Losses Defined Benefit Plan, Actuarial Net (Gains) Losses Defined Benefit Plan, Net Periodic Benefit Cost Defined Benefit Plan, Net Periodic Benefit Cost Pension Costs Related to Retail Electric Operations and Natural Gas Operations Deferred as Regulatory Assets Pension Costs Related to Retail Electric Operations and Natural Gas Operations Deferred as Regulatory Assets Represents the pension expense related to retail electric operations and natural gas operations allowable to defer as a regulatory asset. Entities [Table] Derivative [Line Items] Derivative [Line Items] Derivative Instruments and Hedging Activities Disclosure [Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Long-term Debt [Text Block] Long-term Debt [Text Block] Accounting Policies [Abstract] Use of Estimates Use of Estimates, Policy [Policy Text Block] Asset Management and Supply Service Agreements Asset Management and Supply Service Agreements [Policy Text Block] Disclosure of the accounting policy for the asset management and supply service agreement. Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Stockholders' Equity Note [Abstract] Schedule of Stockholders Equity [Table Text Block] Schedule of Stockholders Equity [Table Text Block] Schedule of accumulated balances related to each component of other comprehensive income (loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Long-term Debt, Maturities, Repayments of Principal in Year Three Schedule of Long-term Debt Instruments [Table] Line of Credit Facility [Axis] Line of Credit Facility [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Medium-term Notes [Member] Medium-term Notes [Member] Senior Notes [Member] Senior Notes [Member] First Mortgage Bonds [Member] First Mortgage Bonds [Member] Secured first mortgage bonds with maturities ranging from 2012 to 2039. Junior Subordinated Debt [Member] Junior Subordinated Debt [Member] Genco Notes [Member] Genco Notes [Member] Secured notes issued by GENCO (South Carolina Generating Company, Inc., a wholly owned subsidiary of the entity) with maturities ranging from 2012 to 2024. Industrial and Pollution Control Bonds [Member] Industrial and Pollution Control Bonds [Member] Industrial and pollution control bonds with maturities ranging from 2012 to 2038. Senior Debentures [Member] Senior Debentures [Member] Senior debentures with maturities ranging from 2012 to 2026. Interest Rate Swap [Member] Interest Rate Swap [Member] Other Debt [Member] Other Debt [Member] Other debt Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank Represents each bank's portion of the credit facilities as a percentage of the aggregate credit facilities. Long-term Debt, Gross Long-term Debt, Gross Derivative Liabilities Derivative Liabilities Long-term Debt, Current Maturities Long-term Debt, Current Maturities Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount Long- Term Debt Noncurrent including Derivative Liabilities Long Term Debt Noncurrent including Derivative Liabilities Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. Also includes the fair value of interest rate swaps. Debt Instrument, Interest Rate at Period End Debt Instrument, Interest Rate at Period End Notional Amount of Fair Value Hedge Instruments Notional Amount of Fair Value Hedge Instruments Notional Amount of Cash Flow Hedge Instruments Notional Amount of Cash Flow Hedge Instruments Long-term Debt, Maturities, Repayments of Principal in Year Five Long-term Debt, Maturities, Repayments of Principal in Year Two Long-term Debt, by Maturity [Abstract] Long-term Debt, Maturities, Repayments of Principal in Year Four Debt Instrument, Carrying Amount Including Derivative Liabilities Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. Also includes the fair value of interest rate swaps. Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Derivatives designated as hedging instruments Designated as Hedging Instrument [Member] Derivatives not designated as hedging instruments Not Designated as Hedging Instrument [Member] Other Energy Management Contract [Member] Other Energy Management Contract [Member] Derivative instrument whose primary underlying risk is tied to fixed price supply contracts. Derivatives, Fair Value, by Balance Sheet Location [Axis] Derivatives, Fair Value, by Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Prepayments and other Prepayments and other current assets [member] Prepayments and other current assets line item in the statement of financial position in which fair value amounts of derivative instruments are included. Other deferred debits and other assets Other Deferred Debits and Other Assets [Member] Represents the other deferred debits and other assets line item in the statement of financial position in which fair value amounts of derivative instruments are included. Other current liabilities Other Current Liabilities [Member] Other current liabilities line item in the statement of financial position in which fair value amounts of derivative instruments are included. Other deferred credits and other liabilities Other Deferred Credits and Other Liabilities [Member] Represents the other deferred credits and other liabilities line item in the statement of financial position in which fair value amounts of derivative instruments are included. Asset Derivatives Fair Value Derivative Asset, Fair Value, Gross Asset Liability Derivatives Fair Value Derivative Liability, Fair Value, Gross Liability Reconciliation of the weighted average number of common shares Schedule of Weighted Average Number of Shares [Table Text Block] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] SEGMENT OF BUSINESS INFORMATION Segment Reporting Disclosure [Text Block] EMPLOYEE BENEFIT PLANS Pension and Other Postretirement Benefits Disclosure [Text Block] Regulated Operations [Abstract] Schedule of Regulatory Liabilities [Table] Schedule of Regulatory Liabilities [Table] Regulatory Liability [Axis] Regulatory Liability [Axis] Regulatory Liability [Domain] Regulatory Liability [Domain] Accumulated deferred income taxes Deferred Income Tax Charges [Member] Asset Retirement Obligation Costs [Member] Asset Retirement Obligation Costs [Member] Asset removal costs Asset removal costs Anticipated costs associated with the removal of assets that may occur on the sale, disposal, abandonment or decommissioning of other assets. Storm damage reserve Storm damage reserve Reserve related to repairs of expected future uninsured storm damage that a regulator may direct a regulated enterprise to include in allowable costs for rate-making purposes. Monetization of bankruptcy claim Monetization of bankruptcy claim Anticipated costs associated with the monetization of bankruptcy claim. Deferred gains on interest rate derivatives Deferred gains on interest rate derivatives Discloses the amount of regulatory liabilities related to gains on interest rate derivatives. Other Other Discloses the amount of other regulatory liabilities. Other. Other. Discloses the amount of other regulatory assets. Regulatory Liabilities: Regulatory Liabilities [Line Items] Amount Recovered Through Electric Rates to Offset Turbine Expenses Amount Recovered Through Electric Rates to Offset Turbine Expenses Represents the amount recovered through electric rates to offset turbine maintenance expenditures. Amount Recovered Through Electric Rates to Offset Deferred Pollution, Control Costs Amount Recovered Through Electric Rates to Offset Deferred Pollution, Control Costs Represents the amount recovered through electric rates to offset deferred pollution control costs. Regulatory liabilities Regulatory Liability, Noncurrent Amount allowed to be recovered through electric rates to offset incremental storm damage costs Amount Allowed to be Recovered through Electric Rates to Offset Incremental Storm Damage Costs Represents the amount allowed to be recovered through electric rates to offset the incremental storm damage costs. Annual amount of storm damage costs which can not be offset by amounts recovered through electric rates Annual Storm Damage Costs not offset by Amounts Recovered through Electric Rates Represents the annual amount of storm damage costs which can not be offset by amounts recovered through electric rates. Cost applied to storm damage cost reserve Storm Damage Reserve Cost Applied Represents the cost applied to storm damage cost reserve. Accrual period of nuclear refueling charges (in months) Accrual Term for Nuclear Refueling Charges Represents the accrual period of nuclear refueling charges under the refueling outage cycle where nuclear refueling charges are recorded as a component of cost of service. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Common Shareholders' Equity Common Shareholders' Equity Total of all Stockholders' Equity items other than those pertaining to Preferred Stock. Includes the following: Common Stock at Par, Common Stock Additional Paid-in Capital, Retained Earnings, and Accumulated Other Comprehensive Income (Loss). Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Forward Contract Indexed to Issuer's Equity, Indexed Shares Forward Contract Indexed to Issuer's Equity, Indexed Shares Retained earnings apportioned for payment of cash dividends on SCE&G's common stock Retained Earnings, Restrictions Payment of Cash Dividend Represents the amount of retained earnings apportioned for the payment of cash dividends on the common stock as required under the Federal Power Act. Dividends declared Dividends, Common Stock Accumulated balances related to each component of other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Net unrealized losses on cash flow hedging activities, net of taxes of $50 and $22 Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Net unrealized deferred costs of employee benefit plans, net of taxes of $8 and $6 Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax Tax effect on net unrealized losses on cash flow hedging activities Accumulated Other Comprehensive Income (Loss) Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges Effect, Tax Effect Tax effect of the accumulated change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. It includes the entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. Tax effect on net unrealized deferred costs of employee benefit plans Accumulated Other Comprehensive Income (Loss) Defined Benefit Pension and Other Postretirement Plans, Tax Effect Tax effect of the net gain (loss), prior service cost (credit) and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of the net periodic benefit cost. Losses recognized on cash flow hedges, net of tax Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax Common Stock, Shares Authorized Common Stock, Shares Authorized Common stock issued through various compensation and dividend reinvestment plans, including the Stock Purchase Savings Plan Stock Issued During Period, Value, Dividend Reinvestment Plans and Compensation Plans Value of stock issued during the period from various dividend reinvestment plans and compensation plans. Common stock issued Stock Issued During Period, Value, New Issues Number of shares underlying forward sales contracts (in shares) Forward Contract Indexed to Issuer's Equity, Shares Common stock issued to finance capital expenditures Stock Issued During Period, Value, Purchase of Assets Period over which common shares would be sold under forward sales contracts Forward Contract Indexed to Issuers Equity Term of Sale Represents the period over which common shares would be sold under forward sales contracts. Net proceeds from settlement of forward sales agreements Derivative, Cash Received on Hedge Common Stockholders' Equity Common Stockholders' Equity Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, Disclosure Item Amounts [Domain] Fair Value, Disclosure Item Amounts [Domain] Carrying Amount Carrying (Reported) Amount, Fair Value Disclosure [Member] Estimated Fair Value Estimate of Fair Value, Fair Value Disclosure [Member] Financial instruments for which the carrying amount may not equal estimated fair value Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Long-term debt Long-term Debt, Fair Value Related Party Transactions [Abstract] Statement [Table] AFFILIATED TRANSACTIONS Related Party Transactions Disclosure [Text Block] Components of Net Periodic Benefit Cost (Income) Schedule of Net Benefit Costs [Table Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Utility Plant In Service Public Utilities, Property, Plant and Equipment, Plant in Service Accumulated Depreciation and Amortization Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Construction Work in Progress Public Utilities, Property, Plant and Equipment, Amount of Construction Work in Process Included in Rate Base Nuclear Fuel, Net of Accumulated Amortization Nuclear Fuel, Net of Amortization Goodwill, Net of Writedown of $230 Goodwill Utility Plant, Net Public Utilities, Property, Plant and Equipment, Net Nonutility Property and Investments: Nonutility Property and Investments [Abstract] 23558eb0-66d6-11e1-ba93-1231380dc193 Nonutility property, net of accumulated depreciation of $131 and $118 Property, Plant and Equipment, Net Assets held in trust, net-nuclear decommissioning Decommissioning Fund Investments Other investments Other Long-term Investments Nonutility Property and Investments, Net Nonutility Property and Investments, Net Amount representing the nonutility properties and investments as of the balance sheet date. Current Assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Receivables, net of allowance for uncollectible accounts of $6 and $9 Accounts Receivable, Net, Current Due from Affiliate, Current Due from Affiliate, Current Inventories (at average cost): Inventory, Net [Abstract] Fuel Energy Related Inventory Materials and supplies Other Inventory, Supplies Emission allowances Other Inventory Prepayments and other Other Assets, Current Deferred income taxes Deferred Tax Assets (Liabilities), Net, Current Total Current Assets Assets, Current Deferred Debits and Other Assets: Regulated Entity, Other Assets, Noncurrent [Abstract] Regulatory assets Regulatory Assets, Noncurrent Other Other Assets, Noncurrent Total Deferred Debits and Other Assets Regulated Entity, Other Assets, Noncurrent Total Assets Capitalization and Liabilities Liabilities and Equity [Abstract] Common equity Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest Long-Term Debt, Net Total Capitalization Capitalization, Long-term Debt and Equity Current Liabilities: Liabilities, Current [Abstract] Short-term borrowings Short-term Debt Current portion of long-term debt Accounts payable Accounts Payable, Current Due to Affiliate, Current Due to Affiliate, Current Customer deposits and customer prepayments Customer Advances and Deposits, Current Taxes accrued Accrued Income Taxes, Current Interest accrued Interest Payable, Current Dividends declared Dividends Payable, Current Derivative financial instruments Derivative Instruments and Hedges, Liabilities Other Other Liabilities, Current Total Current Liabilities Liabilities, Current Deferred Credits and Other Liabilities: Liabilities, Noncurrent [Abstract] Deferred income taxes, net Deferred Tax Assets (Liabilities), Net, Noncurrent Deferred investment tax credits Accumulated Deferred Investment Tax Credit Asset retirement obligations Asset Retirement Obligations, Noncurrent Pension and other postretirement benefits Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent Other Other Liabilities, Noncurrent Total Deferred Credits and Other Liabilities Liabilities, Noncurrent Commitments and Contingencies (Note 9) Commitments and Contingencies Total Liabilities and Equity Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Statement, Business Segments [Axis] Statement, Business Segments [Axis] Segment [Domain] Segment [Domain] Electric Operations Electric Operations The Electric Operations segment is engaged in the generation, transmission, distribution and sale of electricity in South Carolina. Gas Distribution Gas Distribution Segment [member] [member] The Gas Distribution segment is engaged in the purchase, transportation and sale of natural gas to retail customers in parts of North Carolina and South Carolina. Retail Gas Marketing Retail Gas Marketing Segment [member] [member] Retail Gas Marketing segment markets natural gas in Georgia. Energy Marketing Energy Marketing Segment [member] [member] Energy Marketing markets natural gas to industrial and large commercial customers and municipalities, primarily in the Southeast. All Other All Other This segment represents equity method investments and other nonreportable segments of the entity. Adjustments/Eliminations Business Intersegment, Eliminations [Member] External Revenue Intersegment Revenue Segment Reporting Information, Intersegment Revenue Operating Income Income Available to Common Shareholders of SCANA Segment Assets Goodwill, Writedown Accumulated Amortization and Write-down, Goodwill Amount of acquisition adjustments recognized during the period that results from the amortization and write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment. Nonutility property, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Receivables, net of allowance for uncollectible accounts Allowance for Doubtful Accounts Receivable, Current Schedule of Rate Determination [Table] Schedule of Rate Determination [Table] Represents the information pertaining to rate matters. PSNC Energy PSNC Energy Represents Public Service Company of North Carolina, a wholly owned subsidiary of the entity. Motion request filed by NCUC Motion Request Filed by NCUC [Member] Represents the information pertaining to the motion request filed by the public staff of the NCUC. Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Updated capital cost and construction schedule Pending or Threatened Litigation [Member] Rate Matters [Line Items] Rate Matters [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Recognized amount of deferred state income tax credits to be offset against fuel costs Public Utilities, Deferred State Tax Credits Accelerated Recognition Fuel Cost The amount of previously deferred state tax credits being recognized on an accelerated basis to decrease fuel cost. Increase in retail electric rates (as a percent) Public Utilities, Percent Increase (Decrease) in Retail Electric Rates Represents the percentage increase or decrease in retail electric rates. Allowable return on common equity (as a percent) Public Utilities, Authorized Allowable Return on Common Equity, Percentage Represents the allowable return on common equity. Stipulations adopted pertaining to the order issued Public Utilities, Description of Stipulations Related to Rate Matters Represents the various stipulations required to be adopted for determining electric base rates and authorizing an allowed return on common equity. Public Utilities Stipulations Related to Rate Matters Credit Off Set by Amortization of Weather Related Revenues Public Utilities Stipulations Related to Rate Matters Credit Off Set by Amortization of Weather Related Revenues Represents the amount of the credit to customers to be offset by amortization of weather-related revenues. Length of credit period (in years) Public Utilities Stipulations Related to Rate Matters Credit Off Set by Amortization of Weather Related Revenues Length of Period Represents the length of the period in which the credit to customers to be offset by amortization of weather-related revenues. Demand Side Management Program Costs, Noncurrent Demand Side Management Program Costs, Noncurrent Public Utilities Stipulations Related to Rate Matters Credit Offset by Amortization of Weather Related Revenues Benenefits Exhausted Public Utilities Stipulations Related to Rate Matters Credit Offset by Amortization of Weather Related Revenues Benenefits Exhausted Represents the amount of the credit to customers offset by accelerated recognition of previously deferred state income tax credits which has been exhausted. Public Utilities Construction of New Nuclear Generating Units Public Utilities Construction of New Nuclear Generating Units Represents the number of new nuclear generating units at summer station. Number of Parties Jointly and Severally Filed Appeals Number of Parties Jointly and Severally Filed Appeals Represents the number of intervenors who filed separate appeals to challenge the order passed by the regulatory authority. Length of credit period (in years) Public Utilities Stipulations Related to Rate Matters Credit Off Set by Accelerated Recognition of Previously Deferred State Income Tax Credits Length of Period Represents the length of the period in which the credit to customers to be offset by accelerated recognition of previously deferred state income tax credits. scg_Original Estimated Contingency Cost scg_Original Estimated Contingency Cost scg_Original Estimated Contingency Cost Contingency cost associated with the project Estimated Contingency Costs Represents the estimated contingency cost associated with the Summer Station project. Public Utilities, Property, Plant and Equipment Identifiable Capital Costs Public Utilities, Property, Plant and Equipment Identifiable Capital Costs Represents the identifiable capital costs on the entity's schedule for construction. Additional identifiable capital costs related to new federal healthcare laws, information security measures and certain minor design modifications Public Utilities Property Plant and Equipment Additional Identifiable Capital Costs Represents the additional identifiable capital costs related to new federal healthcare laws, information security measures and certain minor design modifications. Increase (decrease) in identifiable capital costs related to transmission infrastructure Public Utilities Property Plant and Equipment Identifiable Capital Costs Increase (Decrease) Represents the increase (decrease) in identifiable capital costs related to transmission infrastructure. Public Utilities Additional Labor Expenses for Oversight of New Units Public Utilities Additional Labor Expenses for Oversight of New Units Represents the amounts related to additional labor expenses for the oversight of new units during construction and for preparing to operate the new units, facilities and information technology systems required to support the New Units and their personnel. Jointly Owned Utility Plant Claim Validity Not Accepted Jointly Owned Utility Plant Claim Validity Not Accepted Represents the amount of claims on the validity not accepted by the subsidiary. Public Utilities Percent Increase (Decrease) in Retail Electric Rates Requested and Approved Under BLRA Public Utilities Percent Increase (Decrease) in Retail Electric Rates Requested and Approved Under BLRA Represents the percentage increase or decrease in retail electric rates requested and approved under the BLRA. Increase (decrease) in retail electric rate requested under the BLRA Public Utilities Increase (Decrease) in Retail Electric Rates Requested and Approved under BLRA Represents the equivalent total amount of the rate increase or decrease requested and approved under the BLRA. Percentage increase (decrease) in natural gas retail rates under the RSA (as a percent) Public Utilities, Percent Increase (Decrease) in Retail Natural Gas Rates Represents the percentage increase or decrease in retail natural gas rates. Increase (decrease) in natural gas retail rates under the RSA Public Utilities, Increase (Decrease) in Retail Natural Gas Rates Requested and Approved under RSA Represents the equivalent total amount of the rate increase or decrease in retail natural gas rates requested and approved under the RSA. Basis for rate calculation Public Utilities, Rate Calculation Basis Describes the basis for the methodology used to calculate retail natural gas rates. Certain charges reassigned from cost of gas for which motion request filed by Public Staff of the NCUC Public Utilities Certain Charges Reassigned from Cost of Gas Represents the amount of the certain charges reassigned from cost of gas for which motion request filed by Public Staff of the NCUC. Increase in retail electric rates Public Utilities, Increase (Decrease) in Retail Electric Rates Represents the increase or decrease in retail electric rates. Labor expenses for oversight of new units Public Utilities Additional Skills Training and Staff Experience Expenses Represents the amounts related to additional skills, training and experience for the staff which will operate the New Units, the accelerated hiring and training of staff to meet an accelerated completion and in-service date of the second New Unit, and facilities, equipment and information technology systems required to support the New Units and their personnel. Public Utilities, Increase (Decrease) in Cost of Gas Component of Retail Natural Gas Rates Public Utilities, Increase (Decrease) in Cost of Gas Component of Retail Natural Gas Rates Represents the increase or decrease in the cost of gas component in retail natural gas rates. Regulatory Noncurrent Asset, Amortization Period Regulatory Noncurrent Asset, Amortization Period Schedule of Capitalization, Equity [Line Items] Schedule of Capitalization, Equity [Line Items] COMMON EQUITY Stockholders' Equity Note Disclosure [Text Block] Income Tax Disclosure [Abstract] Long-Term Debt and Liquidity [Abstract] Long-Term Debt and Liquidity [Abstract] Schedule of Line of Credit Facilities [Table Text Block] Schedule of Line of Credit Facilities [Table Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Medium Term Notes First [Member] Medium Term Notes First [Member] Debt instruments issued with maturities ranging from five to ten years. First Mortgage Bonds Due 2042 [Member] First Mortgage Bonds Due 2042 [Member] Represents first mortgage bonds which were due on February 1, 2042. Medium Term Notes 6.25 Percent Due 2012 [Member] Medium Term Notes 6.25 Percent Due 2012 [Member] Represents 6.25 percent medium term notes due February 1, 2012. Line of Credit [Member] Line of Credit [Member] Industrial Revenue Bonds issued by JEDA, the proceeds of which were loaned to subsidiary Industrial Revenue Bonds issued by JEDA, the proceeds of which were loaned to subsidiary Represents industrial revenue bonds issued by a third party, the proceeds of which were loaned to a subsidiary of the entity. Medium Term Notes Due 2011 [Member] Medium Term Notes Due 2011 [Member] Represents medium term notes which were due on February 15, 2011. 4.59 % unsecured senior notes due February 14, 2021 4.59 % unsecured senior notes due February 14, 2021 Represents 4.59 percent unsecured senior notes due on February 14, 2021. 5.45 % first mortgage bonds 5.45 % first mortgage bonds Represents 5.45 percent first mortgage bonds maturing on February 1, 2041. 4.75% medium term notes due May 15, 2021 4.75% medium term notes due May 15, 2021 Represents 4.75 percent medium term notes due May 15, 2021. 6.875% medium term notes 6.875% medium term notes Represents 6.875 percent medium term notes. First Mortgage Bonds due February 1, 2011 First Mortgage Bonds due February 1, 2011 Represents first mortgage bonds which were due on February 1, 2011. Commercial Paper [Member] Commercial Paper [Member] Parent Company [Member] Parent Company [Member] SCE&G (including Fuel Company) SCE&G (including Fuel Company) Represents the combination of SCE&G and Fuel Company as SCE&G has a controlling financial interest in Fuel Company. SCE and G [Member] SCE and G [Member] Represents South Carolina Electric and Gas Company, a wholly owned subsidiary of the entity. Fuel Company Fuel Company Represents South Carolina Fuel Company, Inc, a wholly owned subsidiary of the entity. Genco Genco Represents South Carolina Generating Company, Inc., a wholly owned subsidiary of the entity. Wells Fargo Bank, National Association (Member) Wells Fargo Bank, National Association Represents Wells Fargo Bank, National Association, a lender or provider of the credit facility to the entity. Bank of America, N.A. (Member) Bank of America, N.A. Represents Bank of America, a lender or provider of the credit facility to the entity. Morgan Stanly Bank, N.A. (Member) Morgan Stanly Bank, N.A. Represents Morgan Stanley Bank, a lender or provider of the credit facility to the entity. Branch Banking and Trust Company (Member) Branch Banking and Trust Company Represents Branch Banking and Trust Company, a lender or provider of the credit facility to the entity. Credit Suisse AG, Cayman Islands Branch (Member) Credit Suisse AG, Cayman Islands Branch Represents Credit Suisse AG Cayman Islands Branch, a lender or provider of the credit facility to the entity. JPMorgan Chase Bank, N.A. (Member) JPMorgan Chase Bank, N.A. Represents JPMorgan Chase Bank, a lender or provider of the credit facility to the entity. Mizuho Corporate Bank, Ltd (Member) Mizuho Corporate Bank, Ltd Represents Mizuho Corporate Bank, a lender or provider of the credit facility to the entity. TD Bank, N.A. (Member) TD Bank, N.A. Represents TD Bank, a lender or provider of the credit facility to the entity. UBS Loan Finance LLC (Member) UBS Loan Finance LLC Represents UBS Loan Finance LLC , a lender or provider of the credit facility to the entity. Deutsche Bank AG, New York Branch (Member) Deutsche Bank AG, New York Branch Represents Deutsche Bank AG New York Branch, a lender or provider of the credit facility to the entity. Union Bank, N.A. (Member) Union Bank, N.A. Represents Union Bank, a lender or provider of the credit facility to the entity. US Bank National Association (Member) US Bank National Association Represents US Bank National Association, a lender or provider of the credit facility to the entity. Three other banks (Member) Three other banks Represents other banks that serve as lenders or providers of the credit facility to the entity. Debt Instruments [Abstract] Debt Instruments [Abstract] Debt Instrument, Increase, Additional Borrowings Debt Instrument, Increase, Additional Borrowings Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Decrease, Repayments Debt Instrument, Decrease, Repayments Face value of Industrial Revenue Bonds issued, proceeds of which were availed as loan Debt Instrument, Face Amount Liquidity Liquidity [Abstract] Lines of credit: Line of Credit Facility [Abstract] Committed long-term line of credit, Total Line of Credit Facility, Maximum Borrowing Capacity Outstanding commercial paper (270 or fewer days) Commercial Paper Commercial paper, weighted average interest rate (as a percent) Debt, Weighted Average Interest Rate Commercial paper, maximum term Commercial Paper Maximum Term This element represents the maximum term of borrowings under a commercial paper program. Letters of credit supported by LOC Letters of Credit Outstanding, Amount Available amount under lines of credit Line of Credit Facility, Remaining Borrowing Capacity Commercial paper, maximum borrowing capacity Commercial Paper, Maximum Borrowing Capacity This element represents the maximum borrowing capacity under a commercial paper program, without considering any amounts currently outstanding under the credit facility. LOC advances Line of Credit Facility, Amount Outstanding LOC advances, weighted average interest rate (as a percent) Line of Credit Facility, Interest Rate at Period End Line of Credit Facility Term Line of Credit Facility Term The term of the credit agreements relating to the credit facilities. Number of other banks (in entities) Number of Other Banks Represents the number of other banks that lend or provide the remaining portion of the aggregate credit facilities. income tax [Line Items] income tax [Line Items] income tax [Line Items] Income Tax Disclosure [Text Block] Significant Accounting Policies [Line Items] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Commitments and Contingencies Disclosure [Abstract] Schedule of Environmental Loss Contingencies and Loss Contingencies [Table] Schedule of Environmental Loss Contingencies and Loss Contingencies [Table] Disclosure of environmental loss contingencies by individual site also includes specific components (such as the nature, name, and date) of the loss contingency and gives an estimate of the possible loss or range of loss, or states that a reasonable estimate cannot be made of other than environmental loss contingencies. Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] Jointly Owned Nuclear Power Plant [Member] Jointly Owned Nuclear Power Plant [Member] Ratio Component [Axis] Ratio Component [Axis] Represents the components of a ratio or fraction such as the numerator and the denominator. Ratio Component [Domain] Ratio Component [Domain] Represents the components of a ratio or fraction such as the numerator and the denominator. Numerator Numerator [Member] Represents the numerator. Denominator Denominator [Member] Represents the denominator. Commitments and contingencies Loss Contingencies [Line Items] Nuclear Insurance Nuclear Insurance [Abstract] Federal limit on public liability claims from nuclear incident, approximate Federal Limit on Public Liability Claims from Nuclear Incident Approximate The approximate maximum amount of public liability, as limited by federal law, resulting from a nuclear incident. scg_Maximum Insurance Coverage for each Nuclear Plant by ANI scg_Maximum Insurance Coverage for each Nuclear Plant by ANI scg_Maximum Insurance Coverage for each Nuclear Plant by ANI Maximum liability assessment per reactor for each nuclear incident Maximum Federal Limit on Public Liability Claims Per Reactor for Each Nuclear Incident The maximum amount of public liability per reactor based on each nuclear incident occurring. Maximum yearly assessment per reactor Maximum Federal Limit on Public Liability Claims Per Reactor for Each Year The maximum amount of public liability per reactor based on each nuclear incident occurring in each year. Proportionate ownership share in Summer Station Unit 1 (as a percent) Jointly Owned Utility Plant Ownership Share The proportionate share of interest in a jointly owned utility plant. Maximum prosepective insurance premium per nuclear incident Maximum Prosepective Insurance Premium Per Nuclear Incident The maximum amount of prosepective insurance premium based on each nuclear incident occurring. Proportionate ownership share of the other owner in Summer Station Unit 1 (as a percent) Jointly Owned Utility Plant Ownership Share of Other Owner The proportionate share of third party interest in a jointly owned utility plant. Period for adjustment for inflation of maximum assessment per reactor and maximum yearly assessment (in years) Maximum Federal Limit on Public Liability Claims Per Reactor for Each Nuclear Incident and for Each Year Adjustment for Inflation Period Represents period for adjustment for inflation of maximum assessment per reactor and the maximum yearly assessment. Maximum amount of coverage to nuclear facility for property damage and outage costs Maximum Insurance Coverage to Nuclear Facility for Property Damage and Outage Costs Represents the maximum amount of insurance coverage to nuclear facility for property damage and outage costs provided by policies maintained by the entity. Maximum amount of coverage for accidental property damage Maximum Insurance Coverage of Accidental Property Damage Represents the amount of insurance coverage for accidental property damage occurring during construction provided by builder's risk insurance policy maintained by the entity. Environmental Environmental [Abstract] Number of states required to reduce emissions to attain mandated levels Number of States Required to Reduce Emission to Attain Mandated Levels Represents the number of states which are required to reduce nitrogen oxide and sulfur dioxide emissions in order to attain mandated state levels as per CAIR. Number of MGP decommissioned sites that contain residues of by-product chemicals Number of MGP Decommissioned Sites Represents the number of MGP decommissioned sites containing residues of by-product chemicals that have been decommissioned. Additional costs to be incurred for remediation Site Contingency MGP Estimated Environmental Remediation Cost Estimated future costs arising from requirements to perform environmental remediation activities at specific MGP sites. Deferred costs, net of costs previously recovered through rates and insurance settlements included in regulatory assets Environmental Remediation Costs Recognized in Regulatory Assets Represents deferred costs, net of costs previously recovered through rates and insurance settlements that are included in regulatory assets. Number of MGP sites that require environmental clean-up Number of MGP Sites Requiring Clean Up Represents the number of sites that require environmental clean-up on which MGP residuals are present or suspected. Nuclear Generation Nuclear Generation [Abstract] Number of nuclear electric generation units Number of Nuclear Electric Generation Units Represents the number of nuclear electric generation units to be designed and constructed under an agreement. Generation capacity (in MW) Power Generation Capacity Megawatts Represents the generation capacity (in MW) of the nuclear electric generation units. Percentage applicable to the Company (as a percent) Jointly Owned Utility Plant, Percentage Share Owner 1 Represents the percentage of share in operating costs, ownership, and or/output generated from nuclear generation units under construction. Percentage applicable to joint owner 2 (as a percent) Jointly Owned Utility Plant, Percentage Share Owner 2 Represents the percentage of share in operating costs, ownership, and or/output generated from nuclear generation units under construction. Estimated cash outflow for plant costs and related transmission infrastructure costs of nuclear electric generation site Jointly Owned Utility Plant, Share in Estimated Cash Outlay Represents the estimated cash outflow for plant costs and related transmission infrastructure costs for nuclear electric generation site. Basis for determination of the projected plant costs and related transmission infrastructure costs Jointly Owned Utility Plant, Basis for Cost Projection Description of the basis for determination of the projected plant costs and related transmission infrastructure costs at the nuclear electric generation site. Number of parties available to participate as joint owners if the ownership interest in one or both nuclear plant changes Jointly Owned Utility Plant, Number of Parties Available to Participate as Joint Owner Subject to Change in Ownership Interest in One or Both Units Represents the minimum number of parties available to participate as joint owners if the ownership interest in one or both nuclear plant changes. Jointly Owned Utility Plant, Minimum Period for which Escalation Rates are Considered to Determine Estimated Cash Outlays Jointly Owned Utility Plant, Minimum Period for which Escalation Rates are Considered to Determine Estimated Cash Outlays Represents the minimum period for which escalation rates are considered to determine estimated cash outlays. Jointly Owned Utility Plant, Maximum Period for which Escalation Rates are Considered to Determine Estimated Cash Outlays Jointly Owned Utility Plant, Maximum Period for which Escalation Rates are Considered to Determine Estimated Cash Outlays Represents the maximum period for which escalation rates are considered to determine estimated cash outlays. Share in Approved Capital Costs Share in Approved Capital Costs Represents the approved cost allowed as capital costs. Statement of Cash Flows [Abstract] Cash Flows From Operating Activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile net income to net cash provided from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Earnings from equity method investments, net of distributions Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Losses from equity method investments Income (Loss) from Equity Method Investments Deferred income taxes, net Deferred Income Tax Noncash (Expense) Benefit The noncash component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations. Depreciation and amortization Depreciation, Amortization and Accretion, Net Amortization of nuclear fuel Amortization of Nuclear Fuel The current period expense charged against earnings for the amortization of nuclear fuel to recognize its cost over its useful live. Allowance for equity funds used during construction Cash provided (used) by changes in certain assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Receivables Increase (Decrease) in Receivables Inventories Increase (Decrease) in Inventories Prepayments and other Increase (Decrease) in Prepaid Expense and Other Assets Regulatory liabilities Increase (Decrease) in Regulatory Liabilities Accounts payable Increase (Decrease) in Accounts Payable Taxes accrued Increase (Decrease) in Income Taxes Payable Interest accrued Increase (Decrease) in Interest Payable, Net Regulatory assets Increase (Decrease) in Other Regulatory Assets Changes in other assets Increase (Decrease) in Other Operating Assets Changes in other liabilities Increase (Decrease) in Other Operating Liabilities Net Cash Provided From Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash Flows From Investing Activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Property additions and construction expenditures Payments to Acquire Property, Plant, and Equipment Proceeds from investments (including derivative collateral posted) Proceeds from Sale of Investments and Productive Assets The cash inflow from the sale of investments and productive assets during the period. Purchase of investments (including derivative collateral posted) Payments to Acquire Investments Payments for (Proceeds from) Hedge, Investing Activities Payments for (Proceeds from) Hedge, Investing Activities Payments for interest rate contract settlements Payments for Interest Rate Contract Hedge Investing Activities The cash outflow for an interest rate contract that meets the hedge criteria as either a cash flow hedge or fair value hedge. Net Cash Used in Investing Activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Cash Flows From Financing Activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Proceeds from Issuance of Common Stock Proceeds from Issuance of Common Stock Proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt Repayments of Long-term Debt Repayments of Long-term Debt Dividends Payments of Dividends Contributions from parent Proceeds from Contributions from Parent Short-term borrowings, net Proceeds from (Repayments of) Short-term Debt Short-term borrowings- affiliate,net Proceeds from Short-term Borrowings Affiliate The net cash inflow (outflow) with an affiliate for borrowings having an initial term of repayment within one year or the normal operating cycle, if longer. Net Cash Provided From Financing Activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net (Decrease) Increase in Cash and Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents, January 1 Cash and Cash Equivalents, March 31 Supplemental Cash Flow Information: Supplemental Cash Flow Information [Abstract] Cash paid for-Interest (net of capitalized interest of $2 and $2) Interest Paid, Net Cash paid for-Income taxes Income Taxes Paid, Net Noncash Investing and Financing Activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Accrued construction expenditures Construction in Progress Expenditures Incurred but Not yet Paid Changes to Unrecognized Tax Benefits Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at the beginning of the period Unrecognized Tax Benefits Gross increases tax positions in prior period Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions Gross decreases tax positions in prior period Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions Gross increases current period tax positions Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions Balance at the end of the period Settlements Unrecognized Tax Benefits, Increases (Decrease) Resulting from Settlements with Taxing Authorities The gross amount of increases or decrease in unrecognized tax benefits resulting from settlements with taxing authorities. Lapse of statute of limitations Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations Possible increase in unrecognized tax benefit Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound Possible decrease in unrecognized tax benefit Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound Accrued interest expense related to unrecognized tax benefits Unrecognized Tax Benefits, Interest on Income Taxes Expense Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table] Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table] Reasonably Possible Significant Change in Unrecognized Tax Benefits by Item [Axis] Reasonably Possible Significant Change in Unrecognized Tax Benefits by Item [Axis] Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Other Information Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Other Information Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Unrecognized Tax Benefits, Decreases Resulting from Current Period Tax Positions Unrecognized Tax Benefits, Decreases Resulting from Current Period Tax Positions Public Utilities Disclosure [Text Block] Public Utilities Disclosure [Text Block] Derivative [Table] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Derivative Instruments and Hedging Activities Disclosure [Abstract] Natural gas derivative contracts outstanding Schedule of Derivative Instruments [Table Text Block] Fair value of energy-related derivatives and interest rate derivatives balance sheet location Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivatives in Cash Flow Hedging Relationships Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Derivatives not designated as Hedging Instruments Gain (Loss) Recognized in Income Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Fair Value Disclosures [Abstract] Fair Value, Measurement Inputs, Disclosure [Table Text Block] Fair Value, Measurement Inputs, Disclosure [Table Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] Derivative [Table] Retail Gas Marketing and Energy Marketing Retail Gas and Energy Marketing Segment [Member] Represents the retail gas and energy marketing segment of the entity. Commodity and other energy management contracts designated as cash flow hedges (in DT) Nonmonetary Notional Amount of Price Risk Cash Flow Hedge Derivatives Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments Commodity and other energy management contracts (in DT) Nonmonetary Notional Amount of Price Risk Derivatives Commodity and other energy management contracts not designated as hedges (in DT) Nonmonetary Notional Amount of Basis Swap, Price Risk Derivative Instruments Not Designated as Hedging Instruments Aggregate notional amount of basis swap price risk derivatives not designated as a hedging instrument with notional amounts expressed in nonmonetary units. For example the number of barrels specified in a fuel oil forward purchase contract. Aggregate notional amount of interest rate swaps designated as fair value hedge (in dollars) Notional Amount of Interest Rate Fair Value Hedge Derivatives Aggregate notional amount of interest rate swaps designated as cash flow hedge (in dollars) Notional Amount of Interest Rate Cash Flow Hedge Derivatives Schedule of Regulatory Assets [Table] Schedule of Regulatory Assets [Table] Williams Stations Williams Stations [Member] Represents information pertaining to Williams Stations. Regulatory Asset [Axis] Regulatory Asset [Axis] Regulatory Asset [Domain] Regulatory Asset [Domain] Deferred Income Tax Charges [Member] Under-collections-electric fuel adjustment clause Regulatory Clause Revenues, under-recovered [Member] Environmental remediation costs Environmental Restoration Costs [Member] Franchise agreements Franchise agreements Discloses the amount of regulatory assets related to franchise agreements. Deferred employee benefit plan costs Pension Costs [Member] Planned major maintenance Planned major maintenance Discloses the amount of regulatory assets pertaining to the planned major maintenance. Deferred losses on interest rate derivatives Deferred losses on interest rate derivatives Discloses the amount of regulatory assets related to losses on interest rate derivatives. Deferred pollution control costs Deferred Pollution Control Cost [Member] Discloses the amount of regulatory assets related to the deferred pollution control cost. Regulatory Assets: Regulatory Assets [Line Items] Regulatory assets, expected recovery period (in years) Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Disclosure [Text Block] Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] Schedule of revenue, income and assets by segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Statement, Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Member] Comprehensive Income (Loss) Comprehensive Income [Member] Other Comprehensive Income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Amortization of deferred employee benefit plan costs reclassified to net income, net of tax of $- and $- Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less comprehensive income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Parent [Abstract] Net Income (Loss) Attributable to Parent [Abstract] Income Available to Common Shareholders Other Comprehensive Income (Loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Unrealized gains (losses) on cash flow hedging activities arising during period Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Losses on cash flow hedging activities reclassified to net income Other Comprehensive Income Other Comprehensive Income (Loss), Net of Tax Total Comprehensive Income (Loss) Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis] Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Derivatives in Fair Value Hedging Relationships Fair Value Hedging [Member] Derivatives in Cash Flow Hedging Relationships Cash Flow Hedging [Member] Other energy management contracts Energy Management Contracts [Member] Derivative instrument whose primary underlying risk is tied to fixed price supply contracts. Gain (Loss) on Derivatives Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) Deferred in Regulatory Accounts Effective Portion, Net Derivative Instruments, Gain (Loss) Deferred in Regulatory Accounts Effective Portion, Net The effective portion of gains and losses (net) on derivative instruments designated and qualifying as cash flow hedging instruments that was deferred in regulatory accounts during the current period. Effect of Fair Value Hedges on Statement of Income Effect of Fair Value Hedges on Results of Operations [Abstract] Reduction to interest expense for combined amount of gains on fair value hedges, losses on hedged fixed rate debt, and amortization of deferred gain on previously terminated swaps Derivative Instruments, Gain (Loss) Recognized in Income, Net Effect of Cash Flow Hedges on Statement of Income Effect of Cash Flow Hedges on Results of Operations [Abstract] Gain or (Loss) Deferred in Regulatory Accounts (Effective Portion), classified in interest expense Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income Effective Portion, Net The effective portion of net gain (loss) reclassified from regulatory deferred accounts into income on derivative instruments designated and qualifying as cash flow hedging instruments. Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred Gain or (Loss) Deferred in Regulatory Accounts (Effective Portion), classified in interest expense Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Derivatives not designated as hedging instruments - gain (loss) recognized in income, classified in gas purchased for resale Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net, Total [Abstract] Other gains (losses) recognized in income for ineffectiveness on interest rate hedges designated as cash flow hedges Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness, Net of Tax The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings, net of tax. Derivative, Credit Risk Related Contingent Features [Abstract] Collateral Already Posted, Aggregate Fair Value Collateral Already Posted, Aggregate Fair Value Additional collateral required to be posted to counterparties if all underlying contingent features were fully triggered Additional Collateral, Aggregate Fair Value Aggregate fair value of all derivative instruments with contingent provisions that are in a net liability position Derivative, Net Liability Position, Aggregate Fair Value Significant Accounting Policies [Table] Significant Accounting Policies [Table] Represents the disclosure pertaining to significant accounting policies of the entity. Significant Accounting Policies Asset Management and Supply Service Agreements Asset Management and Supply Service Agreements [Abstract] Percentage of natural gas inventory held by counterparties under asset management and supply service agreements (as a percent) Percentage of Energy Related Inventory Natural Gas in Storage Represents the percentage of natural gas inventory held by counterparties under the asset management and supply service agreements. Natural gas inventory, carrying amount Carrying Amount of Energy Related Inventory Natural Gas in Storage Represents the carrying value of natural gas inventory held by counterparties under the asset management and supply service agreements. Earnings Per Share Weighted Average Shares Outstanding - Basic Incremental Common Shares Attributable to Share-based Payment Arrangements and Equity Forward Agreements Incremental Common Shares Attributable to Share-based Payment Arrangements and Equity Forward Agreements Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method and equity forward arrangements using the reverse treasury stock method. Weighted Average Number of Shares Outstanding, Diluted Schedule of Changes in Electric Rate BLRA [Table Text Block] Schedule of Changes in Electric Rate BLRA [Table Text Block] Tabular disclosure of changes in electric rate during the period as approved by South Carolina Public Service Commission (SCPSC) under the Base Load Review Act (BLRA). The disclosure includes percentage of increase or decrease in rates in addition to the actual amounts. Schedule of Changes in Gas Rate RSA [Table Text Block] Schedule of Changes in Gas Rate RSA [Table Text Block] Tabular disclosure of changes in gas rate during the period as approved by South Carolina Public Service Commission (SCPSC) under the Natural Gas Rate Stabilization Act (RSA) filings. The disclosure includes percentage of increase or decrease in rates in addition to the actual amounts. Schedule of Regulatory Assets [Table Text Block] Schedule of Regulatory Assets [Table Text Block] Schedule of Regulatory Liabilities [Table Text Block] Schedule of Regulatory Liabilities [Table Text Block] Income Taxes [Abstract] Income Taxes [Abstract] Income Tax, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] SCE&G Subsidiaries [Member] Statement, Scenario [Axis] Statement, Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Interest charges, allowance for borrowed funds used during construction Public Utilities, Allowance for Funds Used During Construction, Capitalized Interest Variable Interest Entities by Classification of Entity [Axis] Variable Interest Entities by Classification of Entity [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] VIEs Variable Interest Entity, Primary Beneficiary [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Utility Plant, Net Total Current Assets Total Deferred Debits and Other Assets CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS PARANTHETICAL [Abstract] CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS PARANTHETICAL [Abstract] Cash paid for interest, capitalized interest Interest Paid, Capitalized Common equity footnote - authorized shares [Abstract] Common equity footnote - authorized shares [Abstract] Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Tax Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Tax Document and Entity Information -- None. No documentation exists for this element. -- Entities [Table] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding