3.24.0.1 html 458 642 1 true 151 0 false 16 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Consolidated Balance Sheets Sheet http://www.sceg.com/20231231/taxonomy/role/Role_StatementConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 100020 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.sceg.com/20231231/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome1 Consolidated Statements of Comprehensive Income Statements 4 false false R5.htm 100040 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) Sheet http://www.sceg.com/20231231/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncomeParenthetical Consolidated Statements of Comprehensive Income (Parenthetical) Statements 5 false false R6.htm 100050 - Statement - Consolidated Statements of Cash Flows Sheet http://www.sceg.com/20231231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 6 false false R7.htm 100060 - Statement - Consolidated Statements of Cash Flows (Parenthetical) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlowsParenthetical Consolidated Statements of Cash Flows (Parenthetical) Statements 7 false false R8.htm 100070 - Statement - Consolidated Statements of Changes in Common Equity Sheet http://www.sceg.com/20231231/taxonomy/role/Role_StatementConsolidatedStatementsOfChangesInCommonEquity Consolidated Statements of Changes in Common Equity Statements 8 false false R9.htm 100080 - Disclosure - Nature of Operations Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureNatureOfOperations Nature of Operations Notes 9 false false R10.htm 100090 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 10 false false R11.htm 100100 - Disclosure - Rate and Other Regulatory Matters Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureRateAndOtherRegulatoryMatters Rate and Other Regulatory Matters Notes 11 false false R12.htm 100110 - Disclosure - Operating Revenue Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingRevenue Operating Revenue Notes 12 false false R13.htm 100120 - Disclosure - Equity Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEquity Equity Notes 13 false false R14.htm 100130 - Disclosure - Long-Term and Short-Term Debt Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebt Long-Term and Short-Term Debt Notes 14 false false R15.htm 100140 - Disclosure - Income Taxes Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxes Income Taxes Notes 15 false false R16.htm 100150 - Disclosure - Derivative Financial Instruments Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstruments Derivative Financial Instruments Notes 16 false false R17.htm 100160 - Disclosure - Fair Value Measurements, Including Derivatives Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivatives Fair Value Measurements, Including Derivatives Notes 17 false false R18.htm 100170 - Disclosure - Asset Retirement Obligations Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAssetRetirementObligations Asset Retirement Obligations Notes 18 false false R19.htm 100180 - Disclosure - Employee Benefit Plans and Equity Compensation Plan Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlan Employee Benefit Plans and Equity Compensation Plan Notes 19 false false R20.htm 100190 - Disclosure - Commitments And Contingencies Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments And Contingencies Notes 20 false false R21.htm 100200 - Disclosure - Leases Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeases Leases Notes 21 false false R22.htm 100210 - Disclosure - Operating Segments Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingSegments Operating Segments Notes 22 false false R23.htm 100220 - Disclosure - Utility Plant and Nonutility Property Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureUtilityPlantAndNonutilityProperty Utility Plant and Nonutility Property Notes 23 false false R24.htm 100230 - Disclosure - Affiliated and Related Party Transactions Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAffiliatedAndRelatedPartyTransactions Affiliated and Related Party Transactions Notes 24 false false R25.htm 100240 - Disclosure - Other Income (Expense), Net Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOtherIncomeExpenseNet Other Income (Expense), Net Notes 25 false false R26.htm 100250 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 26 false false R27.htm 100260 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 27 false false R28.htm 100270 - Disclosure - Rate and Other Regulatory Matters (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureRateAndOtherRegulatoryMattersTables Rate and Other Regulatory Matters (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureRateAndOtherRegulatoryMatters 28 false false R29.htm 100280 - Disclosure - Operating Revenue (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingRevenueTables Operating Revenue (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingRevenue 29 false false R30.htm 100290 - Disclosure - Long-Term and Short-Term Debt (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtTables Long-Term and Short-Term Debt (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebt 30 false false R31.htm 100300 - Disclosure - Income Taxes (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxes 31 false false R32.htm 100310 - Disclosure - Derivative Financial Instruments (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsTables Derivative Financial Instruments (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstruments 32 false false R33.htm 100320 - Disclosure - Fair Value Measurements, Including Derivatives (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesTables Fair Value Measurements, Including Derivatives (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivatives 33 false false R34.htm 100330 - Disclosure - Asset Retirement Obligations (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAssetRetirementObligationsTables Asset Retirement Obligations (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAssetRetirementObligations 34 false false R35.htm 100340 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables Employee Benefit Plans and Equity Compensation Plan (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlan 35 false false R36.htm 100350 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables Commitments and Contingencies (Tables) Tables 36 false false R37.htm 100360 - Disclosure - Leases (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesTables Leases (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeases 37 false false R38.htm 100370 - Disclosure - Operating Segments (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingSegmentsTables Operating Segments (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingSegments 38 false false R39.htm 100380 - Disclosure - Utility Plant and Nonutility Property (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureUtilityPlantAndNonutilityPropertyTables Utility Plant and Nonutility Property (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureUtilityPlantAndNonutilityProperty 39 false false R40.htm 100390 - Disclosure - Affiliated and Related Party Transactions (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAffiliatedAndRelatedPartyTransactionsTables Affiliated and Related Party Transactions (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAffiliatedAndRelatedPartyTransactions 40 false false R41.htm 100400 - Disclosure - Other Income (Expense), Net (Tables) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOtherIncomeExpenseNetTables Other Income (Expense), Net (Tables) Tables http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOtherIncomeExpenseNet 41 false false R42.htm 100410 - Disclosure - Nature of Operations (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureNatureOfOperationsNarrativeDetail Nature of Operations (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureNatureOfOperations 42 false false R43.htm 100420 - Disclosure - Summary of Significant Accounting Policies (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesNarrativeDetail Summary of Significant Accounting Policies (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables 43 false false R44.htm 100430 - Disclosure - Summary of Significant Accounting Policies (Schedule of Weighted Average Depreciation Rates) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfWeightedAverageDepreciationRatesDetail Summary of Significant Accounting Policies (Schedule of Weighted Average Depreciation Rates) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables 44 false false R45.htm 100440 - Disclosure - Summary of Significant Accounting Policies (Schedule of Weighted Average Depreciation Rates) (Parenthetical) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfWeightedAverageDepreciationRatesParentheticalDetail Summary of Significant Accounting Policies (Schedule of Weighted Average Depreciation Rates) (Parenthetical) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables 45 false false R46.htm 100450 - Disclosure - Summary of Significant Accounting Policies (Schedule of Cash and Cash equivalents) (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfCashAndCashEquivalentsDetails Summary of Significant Accounting Policies (Schedule of Cash and Cash equivalents) (Details) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables 46 false false R47.htm 100460 - Disclosure - Rate and Other Regulatory Matters (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureRateAndOtherRegulatoryMattersNarrativeDetail Rate and Other Regulatory Matters (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureRateAndOtherRegulatoryMattersTables 47 false false R48.htm 100470 - Disclosure - Rate and Other Regulatory Matters (Schedule of Regulatory Assets) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureRateAndOtherRegulatoryMattersScheduleOfRegulatoryAssetsDetail Rate and Other Regulatory Matters (Schedule of Regulatory Assets) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureRateAndOtherRegulatoryMattersTables 48 false false R49.htm 100480 - Disclosure - Rate and Other Regulatory Matters (Schedule of Regulatory Liabilities) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureRateAndOtherRegulatoryMattersScheduleOfRegulatoryLiabilitiesDetail Rate and Other Regulatory Matters (Schedule of Regulatory Liabilities) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureRateAndOtherRegulatoryMattersTables 49 false false R50.htm 100490 - Disclosure - Operating Revenue (Disaggregation of Revenue) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/DisclosureOperatingRevenueDisaggregationOfRevenueDetail Operating Revenue (Disaggregation of Revenue) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingRevenueTables 50 false false R51.htm 100500 - Disclosure - Operating Revenue (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingRevenueNarrativeDetail Operating Revenue (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingRevenueTables 51 false false R52.htm 100510 - Disclosure - Operating Revenue (Balance and Activity Related to Contract Costs Deferred as Regulatory Assets) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingRevenueBalanceAndActivityRelatedToContractCostsDeferredAsRegulatoryAssetsDetail Operating Revenue (Balance and Activity Related to Contract Costs Deferred as Regulatory Assets) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingRevenueTables 52 false false R53.htm 100520 - Disclosure - Equity (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEquityNarrativeDetail Equity (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEquity 53 false false R54.htm 100530 - Disclosure - Long-Term and Short-Term Debt (Schedule of Debt) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtScheduleOfDebtDetail Long-Term and Short-Term Debt (Schedule of Debt) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtTables 54 false false R55.htm 100540 - Disclosure - Long-Term and Short-Term Debt (Schedule of Debt) (Parenthetical) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtScheduleOfDebtParentheticalDetail Long-Term and Short-Term Debt (Schedule of Debt) (Parenthetical) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtTables 55 false false R56.htm 100550 - Disclosure - Long-Term and Short-Term Debt (Schedule of Principal Payments of Long-Term Debt) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtScheduleOfPrincipalPaymentsOfLongTermDebtDetail Long-Term and Short-Term Debt (Schedule of Principal Payments of Long-Term Debt) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtTables 56 false false R57.htm 100560 - Disclosure - Long-Term and Short-Term Debt (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtNarrativeDetail Long-Term and Short-Term Debt (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtTables 57 false false R58.htm 100570 - Disclosure - Long-Term and Short-Term Debt (Schedule of Line of Credit Facilities) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtScheduleOfLineOfCreditFacilitiesDetail Long-Term and Short-Term Debt (Schedule of Line of Credit Facilities) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtTables 58 false false R59.htm 100580 - Disclosure - Long-Term and Short-Term Debt (Schedule of Line of Credit Facilities) (Parenthetical) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtScheduleOfLineOfCreditFacilitiesParentheticalDetail Long-Term and Short-Term Debt (Schedule of Line of Credit Facilities) (Parenthetical) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLongTermAndShortTermDebtTables 59 false false R60.htm 100590 - Disclosure - Income Taxes (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesNarrativeDetail Income Taxes (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesTables 60 false false R61.htm 100600 - Disclosure - Income Taxes (Details of Income Tax Expense for Continuing Operations Including Noncontrolling Interests) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesDetailsOfIncomeTaxExpenseForContinuingOperationsIncludingNoncontrollingInterestsDetail Income Taxes (Details of Income Tax Expense for Continuing Operations Including Noncontrolling Interests) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesTables 61 false false R62.htm 100610 - Disclosure - Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesScheduleOfEffectiveIncomeTaxRateReconciliationDetail Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesTables 62 false false R63.htm 100620 - Disclosure - Income Taxes (Schedule of Deferred Income Taxes) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesScheduleOfDeferredIncomeTaxesDetail Income Taxes (Schedule of Deferred Income Taxes) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesTables 63 false false R64.htm 100630 - Disclosure - Income Taxes (Summary of Deductible Loss and Credit Carryforwards) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesSummaryOfDeductibleLossAndCreditCarryforwardsDetail Income Taxes (Summary of Deductible Loss and Credit Carryforwards) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesTables 64 false false R65.htm 100640 - Disclosure - Income Taxes (Reconciliation of Unrecognized Tax Benefits Roll Forward) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesReconciliationOfUnrecognizedTaxBenefitsRollForwardDetail Income Taxes (Reconciliation of Unrecognized Tax Benefits Roll Forward) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxesTables 65 false false R66.htm 100660 - Disclosure - Derivative Financial Instruments (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsNarrativeDetail Derivative Financial Instruments (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsTables 66 false false R67.htm 100680 - Disclosure - Derivative Financial Instruments (Offsetting Assets and Liabilities) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/DisclosureDerivativeFinancialInstrumentsOffsettingAssetsAndLiabilitiesDetail Derivative Financial Instruments (Offsetting Assets and Liabilities) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsTables 67 false false R68.htm 100690 - Disclosure - Derivative Financial Instruments (Schedule of Volume of Derivative Activity) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsScheduleOfVolumeOfDerivativeActivityDetail Derivative Financial Instruments (Schedule of Volume of Derivative Activity) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsTables 68 false false R69.htm 100700 - Disclosure - Derivative Financial Instruments (Fair Value of Derivatives) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsFairValueOfDerivativesDetail Derivative Financial Instruments (Fair Value of Derivatives) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsTables 69 false false R70.htm 100710 - Disclosure - Derivative Financial Instruments (Derivatives in Cash Flow Hedging Relationships) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsDerivativesInCashFlowHedgingRelationshipsDetail Derivative Financial Instruments (Derivatives in Cash Flow Hedging Relationships) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsTables 70 false false R71.htm 100720 - Disclosure - Derivative Financial Instruments (Derivatives Not Designated as Hedging Instruments) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsDerivativesNotDesignatedAsHedgingInstrumentsDetail Derivative Financial Instruments (Derivatives Not Designated as Hedging Instruments) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureDerivativeFinancialInstrumentsTables 71 false false R72.htm 100730 - Disclosure - Fair Value Measurements, Including Derivatives (Schedule of Quantitative Information About Level 3 Fair Value Measurements) (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesScheduleOfQuantitativeInformationAboutLevel3FairValueMeasurementsDetails Fair Value Measurements, Including Derivatives (Schedule of Quantitative Information About Level 3 Fair Value Measurements) (Details) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesTables 72 false false R73.htm 100740 - Disclosure - Fair Value Measurements, Including Derivatives (Nonrecurring Fair Value Measurements) (Narrative) (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesNonrecurringFairValueMeasurementsNarrativeDetails Fair Value Measurements, Including Derivatives (Nonrecurring Fair Value Measurements) (Narrative) (Details) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesTables 73 false false R74.htm 100750 - Disclosure - Fair Value Measurements, Including Derivatives (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails Fair Value Measurements, Including Derivatives (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesTables 74 false false R75.htm 100760 - Disclosure - Fair Value Measurements, Including Derivatives (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis and Included in Level 3) (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisAndIncludedInLevel3Details Fair Value Measurements, Including Derivatives (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis and Included in Level 3) (Details) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesTables 75 false false R76.htm 100770 - Disclosure - Fair Value Measurements, Including Derivatives (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Narrative) (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisNarrativeDetails Fair Value Measurements, Including Derivatives (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Narrative) (Details) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesTables 76 false false R77.htm 100780 - Disclosure - Fair Value Measurements, Including Derivatives (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsDetail Fair Value Measurements, Including Derivatives (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureFairValueMeasurementsIncludingDerivativesTables 77 false false R78.htm 100790 - Disclosure - Asset Retirement Obligations (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAssetRetirementObligationsNarrativeDetail Asset Retirement Obligations (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAssetRetirementObligationsTables 78 false false R79.htm 100800 - Disclosure - Asset Retirement Obligations (Schedule of Reconciliation of the Carrying Amount of AROs) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAssetRetirementObligationsScheduleOfReconciliationOfCarryingAmountOfArosDetail Asset Retirement Obligations (Schedule of Reconciliation of the Carrying Amount of AROs) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAssetRetirementObligationsTables 79 false false R80.htm 100810 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanNarrativeDetail Employee Benefit Plans and Equity Compensation Plan (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 80 false false R81.htm 100820 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Changes in Benefit Obligations) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanChangesInBenefitObligationsDetail Employee Benefit Plans and Equity Compensation Plan (Changes in Benefit Obligations) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 81 false false R82.htm 100830 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Significant Assumptions Used to Determine Benefit Obligations) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanSignificantAssumptionsUsedToDetermineBenefitObligationsDetail Employee Benefit Plans and Equity Compensation Plan (Significant Assumptions Used to Determine Benefit Obligations) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 82 false false R83.htm 100840 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Funded Status) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanFundedStatusDetail Employee Benefit Plans and Equity Compensation Plan (Funded Status) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 83 false false R84.htm 100850 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Amounts Recognized on Consolidated Balance Sheets) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanAmountsRecognizedOnConsolidatedBalanceSheetsDetail Employee Benefit Plans and Equity Compensation Plan (Amounts Recognized on Consolidated Balance Sheets) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 84 false false R85.htm 100860 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Amounts Recognized in AOCI) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/DisclosureEmployeeBenefitPlansAndEquityCompensationPlanAmountsRecognizedInAociDetail Employee Benefit Plans and Equity Compensation Plan (Amounts Recognized in AOCI) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 85 false false R86.htm 100870 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Amounts Recognized in Regulatory Assets) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanAmountsRecognizedInRegulatoryAssetsDetail Employee Benefit Plans and Equity Compensation Plan (Amounts Recognized in Regulatory Assets) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 86 false false R87.htm 100880 - Disclosure - Employee Benefit Plans (Change in Fair Value of Plan Assets) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansChangeInFairValueOfPlanAssetsDetail Employee Benefit Plans (Change in Fair Value of Plan Assets) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 87 false false R88.htm 100890 - Disclosure - Employee Benefit Plans (Schedule of Fair Value Measurements By Category) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansScheduleOfFairValueMeasurementsByCategoryDetail Employee Benefit Plans (Schedule of Fair Value Measurements By Category) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 88 false false R89.htm 100900 - Disclosure - Employee Benefit Plans (Schedule of Fair Value Measurements By Category) (Parenthetical) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansScheduleOfFairValueMeasurementsByCategoryParentheticalDetail Employee Benefit Plans (Schedule of Fair Value Measurements By Category) (Parenthetical) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 89 false false R90.htm 100910 - Disclosure - Employee Benefit Plans (Expected Benefit Payments) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansExpectedBenefitPaymentsDetail Employee Benefit Plans (Expected Benefit Payments) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 90 false false R91.htm 100920 - Disclosure - Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetail Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 91 false false R92.htm 100930 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Schedule of Defined Benefit Plan, Amounts Recognized in Accumulated Other Comprehensive Income (Loss)) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanScheduleOfDefinedBenefitPlanAmountsRecognizedInAccumulatedOtherComprehensiveIncomeLossDetail Employee Benefit Plans and Equity Compensation Plan (Schedule of Defined Benefit Plan, Amounts Recognized in Accumulated Other Comprehensive Income (Loss)) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 92 false false R93.htm 100940 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Schedule of Defined Benefit Plan Amounts Recognized in Regulatory Assets) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanScheduleOfDefinedBenefitPlanAmountsRecognizedInRegulatoryAssetsDetail Employee Benefit Plans and Equity Compensation Plan (Schedule of Defined Benefit Plan Amounts Recognized in Regulatory Assets) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 93 false false R94.htm 100950 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Schedule of Assumptions Used in Determining Net Periodic Benefit Cost) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanScheduleOfAssumptionsUsedInDeterminingNetPeriodicBenefitCostDetail Employee Benefit Plans and Equity Compensation Plan (Schedule of Assumptions Used in Determining Net Periodic Benefit Cost) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAndEquityCompensationPlanTables 94 false false R95.htm 100960 - Disclosure - Commitments and Contingencies (Environmental Matters) (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/DisclosureCommitmentsAndContingenciesEnvironmentalMattersNarrativeDetail Commitments and Contingencies (Environmental Matters) (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables 95 false false R96.htm 100970 - Disclosure - Commitments and Contingencies (Claims and Litigation) (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/DisclosureCommitmentsAndContingenciesClaimsAndLitigationNarrativeDetail Commitments and Contingencies (Claims and Litigation) (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables 96 false false R97.htm 100980 - Disclosure - Commitments and Contingencies (Nuclear Insurance) (Narrative) (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/DisclosureCommitmentsAndContingenciesNuclearInsuranceNarrativeDetails Commitments and Contingencies (Nuclear Insurance) (Narrative) (Details) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables 97 false false R98.htm 100990 - Disclosure - Commitments and Contingencies (Schedule of Long-Term Purchase Agreements) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesScheduleOfLongTermPurchaseAgreementsDetail Commitments and Contingencies (Schedule of Long-Term Purchase Agreements) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables 98 false false R99.htm 101000 - Disclosure - Commitments and Contingencies (Schedule of Long-Term Purchase Agreements) (Parenthetical) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesScheduleOfLongTermPurchaseAgreementsParentheticalDetail Commitments and Contingencies (Schedule of Long-Term Purchase Agreements) (Parenthetical) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables 99 false false R100.htm 101010 - Disclosure - Commitments and Contingencies (Surety Bonds) (Narrative) (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/DisclosureCommitmentsAndContingenciesSuretyBondsNarrativeDetails Commitments and Contingencies (Surety Bonds) (Narrative) (Details) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables 100 false false R101.htm 101020 - Disclosure - Leases (Schedule of Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesScheduleOfLeaseAssetsAndLiabilitiesRecordedInConsolidatedBalanceSheetsDetail Leases (Schedule of Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesTables 101 false false R102.htm 101030 - Disclosure - Leases (Schedule of Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Parenthetical) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesScheduleOfLeaseAssetsAndLiabilitiesRecordedInConsolidatedBalanceSheetsParentheticalDetail Leases (Schedule of Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Parenthetical) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesTables 102 false false R103.htm 101040 - Disclosure - Leases (Summary of Total Lease Cost) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesSummaryOfTotalLeaseCostDetail Leases (Summary of Total Lease Cost) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesTables 103 false false R104.htm 101050 - Disclosure - Leases (Cash Paid for Amounts Included in Measurement of Lease Liabilities) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesCashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesDetail Leases (Cash Paid for Amounts Included in Measurement of Lease Liabilities) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesTables 104 false false R105.htm 101060 - Disclosure - Leases (Summary of Weighted Average Remaining Lease Term And Discount Rate for Operating and Finance Leases) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesSummaryOfWeightedAverageRemainingLeaseTermAndDiscountRateForOperatingAndFinanceLeasesDetail Leases (Summary of Weighted Average Remaining Lease Term And Discount Rate for Operating and Finance Leases) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesTables 105 false false R106.htm 101070 - Disclosure - Leases (Schedule of Maturity Analysis of Operating and Finance Lease Liabilities) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesScheduleOfMaturityAnalysisOfOperatingAndFinanceLeaseLiabilitiesDetail Leases (Schedule of Maturity Analysis of Operating and Finance Lease Liabilities) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureLeasesTables 106 false false R107.htm 101080 - Disclosure - Operating Segments (Narrative) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingSegmentsNarrativeDetail Operating Segments (Narrative) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingSegmentsTables 107 false false R108.htm 101100 - Disclosure - Operating Segments - Schedule of Segment Information (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOperatingSegmentsScheduleOfSegmentInformationDetails Operating Segments - Schedule of Segment Information (Details) Details 108 false false R109.htm 101110 - Disclosure - Utility Plant and Nonutility Property - Property, Plant and Equipment (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureUtilityPlantAndNonutilityPropertyPropertyPlantAndEquipmentDetails Utility Plant and Nonutility Property - Property, Plant and Equipment (Details) Details 109 false false R110.htm 101120 - Disclosure - Utility Plant and Nonutility Property - Schedule of Jointly Owned Utility Plants (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureUtilityPlantAndNonutilityPropertyScheduleOfJointlyOwnedUtilityPlantsDetails Utility Plant and Nonutility Property - Schedule of Jointly Owned Utility Plants (Details) Details 110 false false R111.htm 101130 - Disclosure - Utility Plant and Nonutility Property (Narrative) (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureUtilityPlantAndNonutilityPropertyNarrativeDetails Utility Plant and Nonutility Property (Narrative) (Details) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureUtilityPlantAndNonutilityPropertyTables 111 false false R112.htm 101140 - Disclosure - Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Income Statement) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAffiliatedAndRelatedPartyTransactionsScheduleOfAffiliatedTransactionsIncomeStatementDetail Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Income Statement) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAffiliatedAndRelatedPartyTransactionsTables 112 false false R113.htm 101150 - Disclosure - Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Income Statement) (Parenthetical) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAffiliatedAndRelatedPartyTransactionsScheduleOfAffiliatedTransactionsIncomeStatementParentheticalDetail Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Income Statement) (Parenthetical) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAffiliatedAndRelatedPartyTransactionsTables 113 false false R114.htm 101160 - Disclosure - Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Balance Sheet) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAffiliatedAndRelatedPartyTransactionsScheduleOfAffiliatedTransactionsBalanceSheetDetail Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Balance Sheet) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAffiliatedAndRelatedPartyTransactionsTables 114 false false R115.htm 101170 - Disclosure - Affiliated and Related Party Transactions - (Schedule of Affiliated Transactions - Balance Sheet) (Parenthetical) (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/DisclosureAffiliatedAndRelatedPartyTransactionsScheduleOfAffiliatedTransactionsBalanceSheetParentheticalDetails Affiliated and Related Party Transactions - (Schedule of Affiliated Transactions - Balance Sheet) (Parenthetical) (Details) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureAffiliatedAndRelatedPartyTransactionsTables 115 false false R116.htm 101180 - Disclosure - Other Income (Expense), Net (Components of Other Income (Expense), Net) (Detail) Sheet http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOtherIncomeExpenseNetComponentsOfOtherIncomeExpenseNetDetail Other Income (Expense), Net (Components of Other Income (Expense), Net) (Detail) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOtherIncomeExpenseNetTables 116 false false R117.htm 101190 - Disclosure - Other Income (Expense), Net (Narrative) (Details) Sheet http://www.sceg.com/20231231/taxonomy/role/DisclosureOtherIncomeExpenseNetNarrativeDetails Other Income (Expense), Net (Narrative) (Details) Details http://www.sceg.com/20231231/taxonomy/role/Role_DisclosureOtherIncomeExpenseNetTables 117 false false All Reports Book All Reports ck0000091882-20231231.htm ck0000091882-20231231.xsd http://fasb.org/us-gaap/2023 http://xbrl.sec.gov/dei/2023 false false