75000 - Document - Document and Entity Information
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75010 - Statement - Consolidated Balance Sheets
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75020 - Statement - Consolidated Balance Sheets (Parenthetical)
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75030 - Statement - Consolidated Statements of Comprehensive Income
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75040 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical)
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75050 - Statement - Consolidated Statements of Cash Flows
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75060 - Statement - Consolidated Statements of Cash Flows (Parenthetical)
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75070 - Statement - Consolidated Statements of Changes in Common Equity
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995455 - Disclosure - Cybersecurity Risk Management, Strategy and Governance
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995465 - Disclosure - Nature of Operations
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995475 - Disclosure - Summary of Significant Accounting Policies
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995485 - Disclosure - Rate and Other Regulatory Matters
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995495 - Disclosure - Operating Revenue
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995505 - Disclosure - Equity
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995515 - Disclosure - Long-Term and Short-Term Debt
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995525 - Disclosure - Income Taxes
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995535 - Disclosure - Derivative Financial Instruments
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995545 - Disclosure - Fair Value Measurements, Including Derivatives
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995555 - Disclosure - Asset Retirement Obligations
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995565 - Disclosure - Employee Benefit Plans and Equity Compensation Plan
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995575 - Disclosure - Commitments And Contingencies
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995585 - Disclosure - Leases
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995595 - Disclosure - Operating Segments
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995605 - Disclosure - Utility Plant and Nonutility Property
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995615 - Disclosure - Affiliated and Related Party Transactions
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995625 - Disclosure - Other Income (Expense), Net
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995635 - Disclosure - Summary of Significant Accounting Policies (Policies)
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995645 - Disclosure - Summary of Significant Accounting Policies (Tables)
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995655 - Disclosure - Rate and Other Regulatory Matters (Tables)
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995665 - Disclosure - Operating Revenue (Tables)
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995675 - Disclosure - Long-Term and Short-Term Debt (Tables)
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995685 - Disclosure - Income Taxes (Tables)
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995695 - Disclosure - Derivative Financial Instruments (Tables)
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995705 - Disclosure - Fair Value Measurements, Including Derivatives (Tables)
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995715 - Disclosure - Asset Retirement Obligations (Tables)
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995725 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Tables)
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995735 - Disclosure - Commitments and Contingencies (Tables)
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995745 - Disclosure - Leases (Tables)
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995755 - Disclosure - Operating Segments (Tables)
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995765 - Disclosure - Utility Plant and Nonutility Property (Tables)
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995775 - Disclosure - Affiliated and Related Party Transactions (Tables)
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995785 - Disclosure - Other Income (Expense), Net (Tables)
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995795 - Disclosure - Nature of Operations (Narrative) (Detail)
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995805 - Disclosure - Summary of Significant Accounting Policies (Narrative) (Detail)
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995815 - Disclosure - Summary of Significant Accounting Policies (Schedule of Weighted Average Depreciation Rates) (Detail)
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995825 - Disclosure - Summary of Significant Accounting Policies (Schedule of Cash and Cash equivalents) (Details)
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995835 - Disclosure - Rate and Other Regulatory Matters (Narrative) (Detail)
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995845 - Disclosure - Rate and Other Regulatory Matters (Schedule of Regulatory Assets) (Detail)
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995855 - Disclosure - Rate and Other Regulatory Matters (Schedule of Regulatory Liabilities) (Detail)
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995865 - Disclosure - Operating Revenue (Disaggregation of Revenue) (Detail)
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995875 - Disclosure - Operating Revenue (Narrative) (Detail)
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995885 - Disclosure - Operating Revenue (Balance and Activity Related to Contract Costs Deferred as Regulatory Assets) (Detail)
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995895 - Disclosure - Equity (Narrative) (Detail)
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995905 - Disclosure - Long-Term and Short-Term Debt (Schedule of Debt) (Detail)
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995915 - Disclosure - Long-Term and Short-Term Debt (Schedule of Debt) (Parenthetical) (Detail)
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995925 - Disclosure - Long-Term and Short-Term Debt (Schedule of Principal Payments of Long-Term Debt) (Detail)
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995935 - Disclosure - Long-Term and Short-Term Debt (Narrative) (Detail)
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995945 - Disclosure - Long-Term and Short-Term Debt (Schedule of Line of Credit Facilities) (Detail)
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995955 - Disclosure - Long-Term and Short-Term Debt (Schedule of Line of Credit Facilities) (Parenthetical) (Detail)
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995965 - Disclosure - Income Taxes (Narrative) (Detail)
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995975 - Disclosure - Income Taxes (Details of Income Tax Expense for Continuing Operations Including Noncontrolling Interests) (Detail)
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995985 - Disclosure - Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Detail)
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995995 - Disclosure - Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Detail) 2
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996005 - Disclosure - Income Taxes (Summary of Income Tax Payments (Net of Funds Received) (Detail)
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996015 - Disclosure - Income Taxes (Schedule of Deferred Income Taxes) (Detail)
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996025 - Disclosure - Income Taxes (Schedule of Deferred Income Taxes) (Detail) 2
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996035 - Disclosure - Income Taxes (Schedule of Deferred Income Taxes) (Detail) 3
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996045 - Disclosure - Income Taxes (Summary of Deductible Loss and Credit Carryforwards) (Detail)
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996055 - Disclosure - Income Taxes (Reconciliation of Unrecognized Tax Benefits Roll Forward) (Detail)
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996065 - Disclosure - Derivative Financial Instruments (Narrative) (Detail)
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996075 - Disclosure - Derivative Financial Instruments (Offsetting Assets and Liabilities) (Detail)
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996085 - Disclosure - Derivative Financial Instruments (Offsetting Assets and Liabilities) (Parenthetical) (Details)
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996095 - Disclosure - Derivative Financial Instruments (Schedule of Volume of Derivative Activity) (Detail)
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996105 - Disclosure - Derivative Financial Instruments (Fair Value of Derivatives) (Detail)
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996115 - Disclosure - Derivative Financial Instruments (Derivatives in Cash Flow Hedging Relationships) (Detail)
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996125 - Disclosure - Derivative Financial Instruments (Derivatives Not Designated as Hedging Instruments) (Detail)
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996135 - Disclosure - Fair Value Measurements, Including Derivatives (Schedule of Quantitative Information About Level 3 Fair Value Measurements) (Details)
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996145 - Disclosure - Fair Value Measurements, Including Derivatives (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details)
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996155 - Disclosure - Fair Value Measurements, Including Derivatives (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis and Included in Level 3) (Details)
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996165 - Disclosure - Fair Value Measurements, Including Derivatives (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Narrative) (Details)
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996175 - Disclosure - Fair Value Measurements, Including Derivatives (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Detail)
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996185 - Disclosure - Asset Retirement Obligations (Narrative) (Detail)
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996195 - Disclosure - Asset Retirement Obligations (Schedule of Reconciliation of the Carrying Amount of AROs) (Detail)
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996205 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Narrative) (Detail)
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996215 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Changes in Benefit Obligations) (Detail)
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996225 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Significant Assumptions Used to Determine Benefit Obligations) (Detail)
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996235 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Funded Status) (Detail)
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996245 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Amounts Recognized on Consolidated Balance Sheets) (Detail)
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996255 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Amounts Recognized in AOCI) (Detail)
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996265 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Amounts Recognized in Regulatory Assets) (Detail)
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996275 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Change in Fair Value of Plan Assets) (Detail)
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996285 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Schedule of Fair Value Measurements By Category) (Detail)
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996295 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Schedule of Fair Value Measurements By Category) (Parenthetical) (Detail)
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996305 - Disclosure - Employee Benefit Plans and Equity Compensation Plan - (Schedule of Net Change In Pension And Other Postretirement Plan Assets Included in Level 3 Fair Value) (Details)
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996315 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Expected Benefit Payments) (Detail)
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996325 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Components of Net Periodic Benefit Cost) (Detail)
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996335 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Schedule of Defined Benefit Plan, Amounts Recognized in Accumulated Other Comprehensive Income (Loss)) (Detail)
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996345 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Schedule of Defined Benefit Plan Amounts Recognized in Regulatory Assets) (Detail)
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996355 - Disclosure - Employee Benefit Plans and Equity Compensation Plan (Schedule of Assumptions Used in Determining Net Periodic Benefit Cost) (Detail)
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996365 - Disclosure - Commitments and Contingencies (Narrative) (Detail)
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996375 - Disclosure - Commitments and Contingencies (Environmental Matters) (Narrative) (Detail)
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996385 - Disclosure - Commitments and Contingencies (Claims and Litigation) (Narrative) (Detail)
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996395 - Disclosure - Commitments and Contingencies (Nuclear Insurance) (Narrative) (Details)
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996405 - Disclosure - Commitments and Contingencies (Schedule of Long-Term Purchase Agreements) (Detail)
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996415 - Disclosure - Commitments and Contingencies (Schedule of Long-Term Purchase Agreements) (Parenthetical) (Detail)
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996425 - Disclosure - Commitments and Contingencies (Surety Bonds) (Narrative) (Details)
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996435 - Disclosure - Leases (Schedule of Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Detail)
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996445 - Disclosure - Leases (Schedule of Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Parenthetical) (Detail)
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996455 - Disclosure - Leases (Summary of Total Lease Cost) (Detail)
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996465 - Disclosure - Leases (Cash Paid for Amounts Included in Measurement of Lease Liabilities) (Detail)
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996475 - Disclosure - Leases (Summary of Weighted-average Remaining Lease Term And Discount Rate for Operating and Finance Leases) (Detail)
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996485 - Disclosure - Leases (Schedule of Maturity Analysis of Operating and Finance Lease Liabilities) (Detail)
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996495 - Disclosure - Leases (Schedule of Maturity Analysis of Operating and Finance Lease Liabilities) (Detail) 2
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996505 - Disclosure - Operating Segments (Narrative) (Detail)
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996515 - Disclosure - Operating Segments - Schedule of Segment Information (Details)
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996525 - Disclosure - Utility Plant and Nonutility Property - Property, Plant and Equipment (Details)
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996535 - Disclosure - Utility Plant and Nonutility Property - Schedule of Jointly Owned Utility Plants (Details)
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996545 - Disclosure - Utility Plant and Nonutility Property (Narrative) (Details)
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996555 - Disclosure - Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Income Statement) (Detail)
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996565 - Disclosure - Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Income Statement) (Parenthetical) (Detail)
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996575 - Disclosure - Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Balance Sheet) (Detail)
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996585 - Disclosure - Affiliated and Related Party Transactions (Schedule of Affiliated Transactions - Balance Sheet) (Parenthetical) (Detail)
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996595 - Disclosure - Other Income (Expense), Net (Components of Other Income (Expense), Net) (Detail)
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Capitalized Contract Cost [Table Text Block]
Balance and Activity Related to Contract Costs Deferred as Regulatory Assets
Increase (Decrease) in Interest Payable, Net
Interest accrued
Retirement Plan Type [Axis]
Retirement Plan Type
Segments [Domain]
Segments
Number of DESC hydroelectric facilities subject to regulations.
Number Of D E S C Hydroelectric Facilities Subject To Regulations
Number of DESC hydroelectric facilities subject to regulations
Pension and other postretirement benefit plans regulated assets net gains before tax.
Pension And Other Postretirement Benefit Plans Regulated Assets Net Gains Before Tax
Net actuarial (gain) loss
Net actuarial (gain) loss
Environmental Costs, Policy [Policy Text Block]
Environmental
Concentration Risk Type [Axis]
Concentration Risk Type
Over-the-Counter [Member]
Over The Counter [Member]
Estimated Insurance Recoveries
Amount that could be assessed for each licensed reactor
Finance Lease, Liability
Present value of finance lease liabilities
Finance leases
Finance Lease, Liability, Total
Ending balance
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs
Beginning balance
Ending balance
Schedule of Related Party Transactions [Table Text Block]
Schedule of Affiliated Transactions
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Finance Lease, Liability, to be Paid, Year Four
Maturity of finance lease liabilities, 2029
Preferred Stock, Shares Issued
Preferred stock, shares issued
Asset Retirement Obligation Other Conditional Obligations
Asset Retirement Obligation Other Conditional Obligations
Asset retirement obligation, other conditional obligations
Statement of Financial Position Location, Balance [Domain]
Balance Sheet Location
Derivative Asset, Noncurrent
Derivative assets
Defined Benefit Plan, Plan Assets, Contributions by Employer
Defined benefit plan, contributions by employer
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Noncash investing and financing activities:
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate
Crediting interest rate for cash balance plans
Entity Current Reporting Status
Entity Current Reporting Status
Other Commitment
Energy payments under power purchase contracts
Other Commitment, Total
Operating Expenses [Abstract]
Operating Expenses:
Facility Expected Cost, Excluding Financing Costs
Facility expected cost, excluding financing costs.
Facility expected cost, excluding financing costs
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 2
Level 2
Deferred Tax Assets, Net of Valuation Allowance
Total deferred income tax assets
Deferred Tax Assets, Net of Valuation Allowance, Total
Residential, commercial and industrial customers.
Residential Commercial And Industrial Customers [Member]
Residential Commercial And Industrial Customers
Commitments and Contingencies Disclosure [Text Block]
Commitments and Contingencies
Cash Flow Hedging [Member]
Cash Flow Hedging [Member]
Contract with Customer, Refund Liability, Current
Customer deposits and customer prepayments
Charge for refund of amounts from customers
Number of facility
Number of facility.
Number Of Facility
Regulated Entity, Other Assets, Noncurrent [Abstract]
Deferred Debits and Other Assets:
Common Stock, Shares Authorized
Common stock, shares authorized
Percentage Of Earned Return On Equity On Proposed Rate
Percentage Of Earned Return On Equity On Proposed Rate
Percentage of earned return on equity proposed rate
Other nonoperating expense income.
Other Nonoperating Expense Income
Other expense
Other Nonoperating Income (Expense) [Member]
Other Income (Expense), Net
Represents deferred costs, net of costs previously recovered through rates and insurance settlements that are included in regulatory assets.
Environmental Remediation Costs Recognized In Regulatory Assets
Environmental remediation costs recognized in regulatory assets
Asset Retirement Obligation [Policy Text Block]
Asset Retirement Obligations
Product and Service [Axis]
Product and Service
Fair Value by Liability Class [Domain]
Document Fiscal Period Focus
Document Fiscal Period Focus
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Finance Lease, Liability, to be Paid
Maturity of finance lease liabilities, total undiscounted lease payments
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years
Defined benefit plan, expected benefit payments, 2031-2035
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets
Defined benefit plan, assumptions used calculating net periodic benefit cost, expected long-term rate of return on plan assets
Expected return on plan assets
Liability, Defined Benefit Plan, Current
Current liability
Debt Instrument, Interest Rate, Stated Percentage
Debt instrument, interest rate
Interest rate percentage
Revenue from Contract with Customer [Abstract]
Entity Shell Company
Entity Shell Company
Electric Domestic Regulated Revenues - Affiliate
Electric Domestic Regulated Revenues Affiliate
Operating Revenues – Electric from sales to affiliate
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service
Plant in service, jointly owned utility plant
Cash and Cash Equivalent
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value, Total
Purchase Obligations Due in Third Year
Purchase Obligations Due in Third Year.
Purchased electric capacity, 2028
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax
Net actuarial (gain) loss
Net actuarial (gain) loss
Regulatory Agency [Domain]
Regulatory Agency
Defined Benefit Plan, Benefit Obligation
Benefit obligation
Beginning balance
Ending balance
Maximum liability each nuclear plant is insured against.
Maximum Liability Each Nuclear Plant Is Insured Against
Maximum liability each nuclear plant is insured against
Defined Benefit Plan, Expected Future Benefit Payment, Year Two
Defined benefit plan, expected benefit payments, 2027
Cybersecurity Risk Management, Strategy, and Governance [Abstract]
Common stock, shares issued
Common Stock, Shares, Issued
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]
Cybersecurity Risk Board of Directors Oversight [Text Block]
Asset Class [Domain]
Public Utilities, Property, Plant and Equipment, Amount of Construction Work in Process Included in Rate Base
Construction work in progress
Statement [Table]
Statement [Table]
Energy [Axis]
Interest rate - current derivative contract.
Interest Rate Current Derivative Contract [Member]
Interest Rate Swap Current [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Investments Owned Federal Income Tax Note [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions
Increases-current period positions
Regulatory Liability [Axis]
Regulatory Liability
Guarantor Obligations, Nature [Domain]
Schedule of regulatory assets and liabilities.
Schedule Of Regulatory Assets And Liabilities [Table Text Block]
Schedule of Regulatory Assets and Liabilities
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
Schedule of Amounts Recognized in Balance Sheet
Schedule of maturity analysis of operating and finance lease liabilities.
Schedule Of Maturity Analysis Of Operating And Finance Lease Liabilities [Table Text Block]
Schedule of Maturity Analysis of Operating and Finance Lease Liabilities
Other Alternative Investments [Member]
Other alternative investments.
Capitalized Contract Cost, Net
Ending balance
Beginning balance
Capitalized Contract Cost, Net, Total
Beginning balance
Asset Retirement Obligation
Ending balance
Asset Retirement Obligation, Total
Statement [Line Items]
Statement [Line Items]
Business Combination [Domain]
Increase (decrease) in regulatory assets.
Increase Decrease In Regulatory Assets
Regulatory assets
Increase in regulatory assets
Entity Filer Category
Entity Filer Category
Schedule of debt and finance leases maturity.
Schedule Of Debt And Finance Leases Maturity [Table Text Block]
Schedule of Principal Payments of Long-Term Debt
Natural Gas [Member]
Natural gas [Member]
Capital Contribution From Parent
Capital contribution from parent.
Capital contribution from parent
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Liabilities and Equity
Total capitalization and liabilities
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral
Gross amounts not offset in the consolidated balance sheet, net amounts
Gross amounts not offset in the consolidated balance sheet, net amounts
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Number of facilities inactive subject to final rule.
Number of Facilities Inactive Subject to Final Rule
Number of facilities inactive subject to final rule
Credit Concentration Risk [Member]
Credit Concentration Risk [Member]
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent, Total
Changes in unrecognized tax benefits
Long-Term Debt, Maturity, Year Three
2028
Long-Lived Tangible Asset [Axis]
Long-Lived Tangible Asset
Finance Lease, Liability, to be Paid, Year Three
Maturity of finance lease liabilities, 2028
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate
Crediting interest rate for cash balance plans
Derivative assets with affiliates.
Derivative Assets With Affiliates
Derivative assets with affiliates
Fair Value, by Balance Sheet Grouping [Table Text Block]
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
Hedging Relationship [Axis]
Hedging Relationship
Public Utilities, Property, Plant and Equipment, Net
Utility plant, net
Utility plant, net
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]
Transfers into Level 3
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3
Derivative [Line Items]
Derivative [Line Items]
Current Derivative Assets [Member]
Current derivative assets.
Current Derivative Assets [Member]
Power Generation Capacity For Proposed Construction Facility
Power generation capacity for proposed construction facility.
Power generation capacity for proposed construction facility
Deferred Tax Assets, Valuation Allowance
Deferred tax asset,valuation allowance
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
U.S. federal statutory tax rate
Period preceding issuance of bonds.
Period Preceding Issuance Of Bonds
Months preceding issuance of bonds
Inflation adjustments period for nuclear insurance.
Inflation Adjustments Period For Nuclear Insurance
Inflation adjustment period for nuclear insurance
Industrial Revenue Bonds
Industrial Revenue Bonds [Member]
Industrial revenue bonds [member].
Cybersecurity Risk Management Third Party Engaged [Flag]
Other Noncash Income (Expense)
Other Noncash Income (Expense), Total
Other adjustments
Deferred tax liability unrecovered nuclear plant cost.
Deferred Tax Liability Unrecovered Nuclear Plant Cost
Unrecovered nuclear plant cost
Effective Income Tax Rate Reconciliation, Percent
Effective tax rate
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Income Tax Jurisdiction [Axis]
Income Tax Authority
Asset Retirement Obligation, Accretion Expense
Accretion expense
Deferred losses or gains on interest rate derivatives.
Deferred Losses Or Gains On Interest Rate Derivatives [Member]
Deferred Losses or Gains On Interest Rate Derivatives [Member]
Operating and finance lease liability.
Operating And Finance Lease Liability
Total lease liabilities
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
Schedule of Changes in Projected Benefit Obligations
Segment, Expenditure, Addition to Long-Lived Assets
Capital expenditures
Gain (Loss) on Disposition of Assets for Financial Service Operations, Total
Gain (Loss) on Disposition of Assets for Financial Service Operations
Gains on sales of assets
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation
Accumulated depreciation, jointly owned utility plant
Electricity [Member]
Electricity [Member]
Regulated Operation, Regulatory Liability [Table]
Schedule Of Regulatory Liabilities [Table]
Lease Description [Table]
Lease description.
New Expected Amortization Of Carrying Value Of Coal Fired Generating Unit
New expected amortization of carrying value of coal-fired generating unit
New expected amortization of carrying value of coal-fired generating unit.
Gain from transferred remaining utility property, after tax
Gain Related To Litigation Settlement On Transfer of Remaining Property After Tax
Gain related to litigation settlement on transfer of remaining property after-tax.
Defined Benefit Plan, Plan Assets, Benefits Paid
Benefits paid
Related Party
Related Party [Member]
Significant Accounting Policies [Text Block]
Summary of Significant Accounting Policies
Property, Plant and Equipment [Line Items]
Property Plant And Equipment [Line Items]
Regulatory Asset, Current
Regulatory assets
Regulatory assets, current
Proceeds from Issuance of Secured Debt
Proceeds from issuance of debt
Schedule of Cash and Cash Equivalents [Table Text Block]
Schedule of Cash and Cash Equivalents
Guarantor Obligations, Nature [Axis]
Unfunded property additions
Unfunded Property Additions
Unfunded property additions
Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the net benefit cost, including assumed discount rates, rate increase in compensation increase and expected long-term rates of return on plan assets.
Schedule Of Assumptions Used In Determining Net Periodic Benefit Cost [Table Text Block]
Schedule of Assumptions Used in Determining Net Periodic Benefit Cost
Disaggregation of Revenue [Table]
Disaggregation Of Revenue [Table]
Payments to Acquire Investments to be Held in Decommissioning Trust Fund
Payments to acquire investments to be held in decommissioning trust fund
Cybersecurity Risk Management, Strategy, and Governance [Table]
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Other assets and liabilities
Increase (Decrease) in Other Operating Assets and Liabilities, Net, Total
Natural Gas, Storage [Member]
Storage [Member]
Deferred transmission operating costs expected recovery period.
Deferred Transmission Operating Costs Expected Recovery Period
Deferred transmission operating costs expected recovery period
Liability [Member]
Liability
Disaggregation of Revenue [Table Text Block]
Disaggregation of Revenue
Retirement Benefits [Text Block]
Employee Benefit Plans and Equity Compensation Plan
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate
Annual discount rate used to determine benefit obligation
Discount rate percentage
Realized Investment Gains (Losses) [Abstract]
Total realized and unrealized gains (losses):
Other.
Other [Member]
Other
Electric - Other [Member]
Electric Other [ Member]
Electric Other
Retirement Plan Type [Domain]
Retirement Plan Type
Liabilities, Current
Total current liabilities
Regulatory Asset, Noncurrent
Regulatory assets
Regulatory assets, noncurrent
Cost of fuel and purchased gas under collections member.
Cost Of Fuel And Purchased Gas Under Collections [Member]
Cost of Fuel and Purchased Gas Under-Collections [Member]
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Adjustments to reconcile net income to net cash provided by operating activities:
Long-Term Purchase Commitment [Table Text Block]
Schedule of Long-Term Purchase Agreements
Lessee, Operating Lease, Liability, to be Paid, Year Five
Maturity of operating lease liabilities, 2030
Hedging Designation [Domain]
Hedging Designation
Reserves Related to Personal Injury or Wrongful Death Cases
Reserves related to personal injury or wrongful death cases.
Reserves related to personal injury or wrongful death cases
Income Tax Paid, Federal, after Refund Received
Income Tax Paid, Federal, after Refund Received, Total
Federal
Domestic Tax Jurisdiction [Member]
Federal
Purchase Obligation, to be Paid, Year Two
Purchased electric capacity, 2027
Nuclear insurance.
Nuclear Insurance [Member]
Nuclear Insurance
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions
Increases-prior period positions
Consolidation Items [Domain]
Consolidation Items
Entity Small Business
Entity Small Business
Amount Accrued Annually For Tree Trimming And Vegetation Management.
Amount Accrued Annually For Tree Trimming And Vegetation Management
Amount accrued annually for tree trimming and vegetation management
Regulated Operations [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Schedule of Volume of Derivative Activity
Hedging Designation [Axis]
Hedging Designation
Investment Tax Credits
Investment tax credits.
Investment tax credits
Deferred tax assets loss and tax credit carryforwards.
Deferred Tax Assets Loss And Tax Credit Carryforwards
Loss and credit carryforwards
Fuel [Member]
Fuel Used in Electric Generation [Member]
Commodity Contract [Member]
Commodity Contract [Member]
Retained Earnings (Accumulated Deficit)
Retained earnings
Retained Earnings (Accumulated Deficit), Total
Defined Benefit Plan, Funded (Unfunded) Status of Plan
Funded status
Gain (Loss) on Sale of Other Investments
Included in regulatory assets/liabilities
Nature of Operations [Text Block]
Nature of Operations
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Defined Benefit Plan, Alternative Investment
Defined benefit plan, alternative investment.
Alternative investments
Defined Benefit Plan Fair Value Of Plan Assets Realized And Unrealized (Losses) Gains
Defined benefit plan fair value of plan assets realized and unrealized (losses) gains.
Total realized and unrealized (losses) gains
Number of petition agreed for reconsideration
Number of petition agreed for reconsideration.
Number Of Petition Agreed For Reconsideration
Number of prepaid accelerated share repurchase agreements
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Increase decrease in asset retirement obligation and property plant and equipment.
Increase Decrease in Asset Retirement Obligation and Property Plant and Equipment
Decrease in ARO and property, plant and equipment
Leases [Abstract]
Contract with Customer, Liability, Total
Contract with Customer, Liability
Contract liability balances
Amendment Flag
Amendment Flag
Amendment Flag
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service
Composite weighted average depreciation rates for utility plant
Utility plant and non utility property.
Utility Plant And Non Utility Property [Table]
Utility Plant And Non Utility Property [Table]
Product and Service [Domain]
Product and Service
Loss Contingencies [Line Items]
Loss Contingencies [Line Items]
Allowance for Funds Used During Construction, Capitalized Interest
Allowance for funds used during construction
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
U.S. federal statutory tax
Schedule of defined benefit plan, Other changes in plan assets recognized in regulatory assets [Table Text Block].
Schedule Of Defined Benefit Plan Other Changes In Plan Assets Recognized In Regulatory Assets [Table Text Block]
Schedule of Defined Benefit Plan Amounts Recognized in Regulatory Assets
Finance Lease, Interest Expense
Finance lease cost, interest
Regulatory Asset [Line Items]
Regulatory Assets
Liabilities and Equity [Abstract]
CAPITALIZATION AND LIABILITIES
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Environmental Protection Agency [Member]
Environmental protection agency.
EPA
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Net cash provided by operating activities
Derivative, Nonmonetary Notional Amount, Energy Measure
Fixed price
Utilities Operating Expense, Depreciation and Amortization
Depreciation and amortization
Common Stock [Member]
Common Stock
Defined Benefit Plan, Accumulated Benefit Obligation
Defined benefit plan, accumulated benefit obligation
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
Amortization of federal investment tax credits
Effective income tax rate reconciliation amortization of federal investment tax credits.
Effective Income Tax Rate Reconciliation Amortization Of Federal Investment Tax Credits
Amortization of federal investment tax credits
Cybersecurity Risk Role of Management [Text Block]
Tax Credit Carryforward, Amount
Credit Carryforwards, Deductible Amount
Utilities operating expense, impairments after tax.
Utilities Operating Expense, Impairments After Tax
Impairment of assets after tax
Long-Term Debt, Maturity, Year One
2026
Hedging Relationship [Domain]
Hedging Relationship
Operating and finance lease right of use asset.
Operating And Finance Lease Right Of Use Asset
Total lease assets
Noncurrent assets
Assets for Plan Benefits, Defined Benefit Plan
Lessee, Operating Lease, Liability, to be Paid, Year Three
Maturity of operating lease liabilities, 2028
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
Schedule of Net Change In Pension And Other Postretirement Plan Assets Included in Level 3 Fair Value
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Fair Value of Derivatives
Number of manufactured gas plant decommissioned sites contain residues byproduct chemicals.
Number Of Manufactured Gas Plant Decommissioned Sites Contain Residues Byproduct Chemicals
Number of manufacturing gas plant decommissioned sites that contain residues of byproduct chemicals
Surety Bond [Member]
Surety Bonds
Income Tax Paid, by Individual Jurisdiction [Line Items]
Gross amounts not offset in the consolidated balance sheet, financial instruments
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset
Portion at Fair Value Measurement [Member]
Fair Value Disclosure Item Amounts [Default]
Portion at Fair Value Measurement [Member] [Default]
Entity Address, Address Line One
Entity Address, Address Line One
Deferred Tax Liabilities, Gross
Total deferred income tax liabilities
Deferred Tax Liabilities, Gross, Total
Discloses the amount of other regulatory assets.
Other Regulatory Assets [Member]
Other Regulatory Assets [Member]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV
Income Tax, Policy [Policy Text Block]
Income Taxes
Regulatory assets, amortization of actuarial gain (loss), pension and other postretirement benefit plans, net of tax
Regulatory assets, amortization of actuarial losses, pension and other postretirement benefit plans, net of tax
Regulatoryassetsamortizationofactuariallossespensionandotherpostretirementbenefitplansnetoftax
Regulatory assets, amortization of actuarial gain (loss), pension and other postretirement benefit plans, net of tax
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information
Public utilities net revenue requirement amount.
Public Utilities, Net revenue requirement Amount
Public utilities, total revenue requirement amount
Margin Deposit Assets
Margin assets with cash collateral
Derivative Assets
Derivative Asset
Derivative Assets
Derivatives
Public utilities allowance for funds used during construction additions deductions.
Public Utilities Allowance For Funds Used During Construction Additions Deductions
Allowance for equity funds used during construction
Gas Distribution Equipment [Member]
Distribution [Member]
Fuel company
Fuel Company Member
Fuel Company Member
Public utilities, length of transmission line.
Public Utilities Length Of Transmission Line
Miles of Lines
Defined Benefit Plan, Expected Future Benefit Payment, Year Four
Defined benefit plan, expected benefit payments, 2029
Gain Loss On Fuel Used In Electric Generation
Fuel used in electric generation
Gain loss on fuel used in electric generation.
Statement of Financial Position Location, Balance [Axis]
Balance Sheet Location
Nuclear refueling outage cost
Nuclear Refueling Outage Cost
Nuclear refueling outage cost
Intercompany Credit Facility
Intercompany Credit Facility [Member]
Intercompany credit facility.
Operating Lease, Right-of-Use Asset
Operating lease, right of use asset
Operating lease assets
Finance lease liabilities, present value adjustment
Finance Lease, Liability, Undiscounted Excess Amount
Finance lease liabilities, present value adjustment
Defined Benefit Plan, Plan Assets, Category [Domain]
Defined Benefit Plan, Plan Assets, Category
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]
Net Income (Loss) Attributable to Noncontrolling Interest
Comprehensive Income Attributable to Noncontrolling Interest
Net Income (Loss) Attributable to Noncontrolling Interest, Total
Regulatory assets recognized in regulatory assets pension and other postretirement benefit plans net of tax.
Regulatory Assets Recognized In Regulatory Assets Pension And Other Postretirement Benefit Plans Net Of Tax
Regulatory assets, total recognized in regulatory assets, pension and other postretirement benefit plans, net of tax
Decrease In Storm Damage And DSM Components
Decrease in storm damage and DSM components.
Decrease in storm damage and DSM components
Document Type
Document Type
Document Type
Income Taxes Paid, Net
Cash for income taxes paid
Income taxes paid
Total tax payments
Collaborative Arrangement and Arrangement Other than Collaborative [Axis]
Collaborative Arrangement and Arrangement Other than Collaborative
Collaborative Arrangement and Arrangement Other than Collaborative [Domain]
Collaborative Arrangement and Arrangement Other than Collaborative
Entity Central Index Key
Entity Central Index Key
Accounts Receivable, Allowance for Credit Loss, Current
Receivables, customer, allowance for uncollectible accounts
Defined Benefit Plan Actuarial Gain Loss Due To Decrease In Discount Rate
Defined Benefit Plan Actuarial Gain Loss Due To Decrease In Discount Rate
Defined benefit plan gain (loss) due to decrease in discount rate
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]
Tree Trimming And Vegetation Management Cost.
Tree Trimming And Vegetation Management Cost
Tree trimming and vegetation management cost
DESC Summer.
D E S C Summer [Member]
DESC Summer
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation
Net increase in cash, restricted cash and equivalents
Net decrease in cash, restricted cash and equivalents
Subsequent Event Type [Domain]
Dominion Energy Defined Benefit Plans.
Dominion Energy Defined Benefit Plans [Member]
Dominion Energy Defined Benefit Plans [Member]
Amendments
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment
Common Stock, Par or Stated Value Per Share
Common stock, par value
Natural Gas Liquids (NGL) [Member]
Natural Gas (bcf) [Member]
Direct and allocated costs
Operating Costs and Expenses
Operating Costs and Expenses, Total
Deferred tax assets liabilities fuel, purchased energy and gas costs.
Deferred Tax Assets Liabilities Fuel Purchased Energy And Gas Costs
Deferred fuel, purchased energy and gas costs
Deferred fuel, purchased energy and gas costs
Corporate Segment and Other Operating Segment [Member]
Corporate and Other
Document Financial Statement Error Correction [Flag]
Tabular disclosure of the amount recognized in accumulated other comprehensive income.
Schedule Of Defined Benefit Plan Amounts Recognized In Accumulated Other Comprehensive Income Loss [Table Text Block]
Schedule of Amounts Recognized in AOCI
Debt Disclosure [Abstract]
Derivative [Table]
Derivative [Table]
Deferred Compensation Arrangement with Individual, Maximum Contractual Term
Average service period expected to recover other deferred benefit costs
Amortization of Nuclear Fuel
Amortization of nuclear fuel
Estimated Insurance Recoveries Per Year per Reactor
Estimated Insurance Recoveries Per Year Per Reactor
Amount that could be assessed for each licensed reactor per year
Estimate of Fair Value Measurement [Member]
Estimated Fair Value
Hedge Funds
Hedge Funds [Member]
Derivative, Notional Amount
Interest rate
Notional value
Kilo Volt Switchyard Approval Requested for Construction
Kilo volt switchyard approval requested for construction.
Kilo volt switchyard approval requested for construction
Current Fiscal Year End Date
Current Fiscal Year End Date
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)
Actual return (loss) on plan assets
Schedule of Long-Term Debt Instruments [Table]
Debt Instrument [Table]
Purchase Obligation, to be Paid, after Year Five
Purchased electric capacity, Thereafter
Regulatory Liability [Domain]
Regulatory Liability
Schedule of Jointly Owned Utility Plants [Table Text Block]
Schedule of Jointly Owned Utility Plants
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset
Gross amounts not offset in the consolidated balance sheet, cash collateral paid
Litigation Case [Domain]
Litigation Case
Fair Value, by Balance Sheet Grouping [Table]
Fair Value By Balance Sheet Grouping [Table]
Entity Address, State or Province
Entity Address, State or Province
Unfavorable Regulatory Action [Member]
Unfavorable Regulatory Action
Electric Generation Equipment [Member]
Generation [Member]
Increase (Decrease) in Accounts and Other Receivables
Receivables
Collateral Already Posted, Aggregate Fair Value
Collateral already posted
Schedule of Asset Retirement Obligations [Table Text Block]
Schedule of Reconciliation of the Carrying Amount of AROs
Proceeds from (Repayments of) Short-Term Debt
Short-term borrowings, net
Proceeds from (Repayments of) Short-Term Debt, Total
Preferred Stock, Shares Outstanding
Preferred stock, shares outstanding
Preferred Stock, Shares Outstanding, Beginning Balance
Preferred Stock, Shares Outstanding, Ending Balance
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total
Total comprehensive income available to common shareholder
Affiliated and related party payables
Due to Affiliated and Related Party Payables Current
Due to affiliated and related party payables current.
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Cash and cash equivalents
Contract with Customer, Liability, Revenue Recognized
Revenue recognized from contract liability balances
Accounts Receivable [Member]
Accounts Receivable [Member]
Asset Retirement Obligation Disclosure [Abstract]
Pension Costs [Member]
Deferred Employee Benefit Plan Costs [Member]
Stockholders' Equity Attributable to Noncontrolling Interest, Total
Equity, Attributable to Noncontrolling Interest
Noncontrolling interest
Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount
State and local income taxes, net of federal income tax effect
Increase (Decrease) in Due to Related Parties, Current
Accounts payable – affiliated and related party
Increase (Decrease) in Due to Related Parties, Current, Total
Additional costs
Capitalized Contract Additional Costs
Capitalized contract additional costs.
Tax Credit Carryforward, Valuation Allowance
Credit Carryforward, Valuation Allowance
Credit Carryforward, Valuation Allowance
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Deferred Income Taxes
First Mortgage Bonds [Member]
First Mortgage Bonds [Member]
First Mortgage Bonds
Amortization of carrying value of coal fired generating units end year.
Amortization Of Carrying Value Of Coal Fired Generating Units End Year
Amortization of carrying value of coal-fired generating unit
Proposed Annual Increase Fuel Cost Retail Electric Rates
Proposed annual increase fuel cost retail electric rates.
Proposed South Carolina Commission Order for Increase of Total Fuel Cost Component of Retail Electric Rates to produce a projected under-recovery
Energy Related Derivative [Member]
Electricity [Member]
Affiliated long-term debt fair value.
Affiliated Long Term Debt Fair Value
Affiliated long-term debt
Other Postretirement Benefits Plan [Member]
Other Postretirement Benefits [Member]
Long-Term Debt, Fair Value
Long-term debt
Subsequent Event [Member]
Subsequent Event [Member]
Estimated Litigation Liability, Current
Reserves for litigation and regulatory proceedings
Annual increase (decrease) in pension cost rider.
Annual Increase Decrease In Pension Cost Rider
Annual increase (decrease) in pension cost rider
Property, Plant and Equipment [Abstract]
Remaining lives of related property period.
Remaining Lives Of Related Property Period
Remaining lives of related property period
Other Assets, Noncurrent
Other
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
Unamortized discount, premium and debt issuance costs, net
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, Total
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]
Schedule of Quantitative Information About Level 3 Fair Value Measurements
Electric Base Rate Case
Electric Base Rate Case [Member]
Electric base rate case.
Nuclear Fuel, Net of Amortization
Nuclear fuel, net of accumulated amortization
Decommissioning Fund Investments
Assets held in trust, nuclear decommissioning
Other Machinery and Equipment [Member]
General and other
Canadys Station [Member]
Canadys Station.
Canadys Station [Member]
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sale
Sales
State and Local Jurisdiction [Member]
State
Regulatory Asset, Amortization Period
Recovery period of regulatory asset
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards
Deferred Tax Assets Operating Loss And Tax Credit Carryforwards
Loss and Credit Carryforwards, Deferred Tax Asset
Loss and credit carryforwards
AOCI Attributable to Parent [Member]
AOCI
Customer [Domain]
Customer
Public utilities materials and supplies inventory write down.
Public Utilities Materials And Supplies Inventory Write Down
Write down certain materials and supplies inventory
Derivative Liability
Derivative Liability
Derivative Liability
Derivatives
Utilities Operating Expense, Maintenance and Operations, Affiliate
Utilities Operating Expense Maintenance And Operations Affiliate
Other operations and maintenance – affiliated suppliers
Gross liabilities presented in the consolidated balance sheet
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral
Fair value of derivative instruments with credit-related contingent provisions that are in liability position and not fully collateralized with cash
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral, Total
Income Tax, Penalty Recognition, Classification [Extensible Enumeration]
Cash and Cash Equivalents [Domain]
Discloses the amount of other regulatory liabilities.
Other Regulatory Liability [Member]
Other Regulatory Liability [Member]
Fair value of certain utility property transferred
Utility Property Fair Value
Utility property fair value.
Amount representing the nonutility properties and investments as of the balance sheet date.
Nonutility Property And Investments Net
Nonutility property and investments, net
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred:
Fair value, assets and liabilities measured on recurring basis.
Fair Value Assets And Liabilities Measured On Recurring Basis [Table Text Block]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis
Minimum [Member]
Minimum [Member]
Minimum
Gross amounts not offset in the consolidated balance sheet, cash collateral received
Derivative Asset Not Subject To Master Netting Arrangement Deduction Cash Collateral Received
Derivative asset, not subject to master netting arrangement, deduction, cash collateral received.
Derivative Asset, Subject to Master Netting Arrangement, before Offset
Total assets, fair value
Assets, Current [Abstract]
Current Assets:
Inter company credit facility maximum capacity
Inter Company Credit Facility Maximum Capacity
Inter company credit facility maximum capacity.
Regulatory Assets And Regulatory Liabilities [Policy Text Block]
Regulatory Assets and Liabilities
Regulatory assets and regulatory liabilities.
Deferred investment tax credits
Deferred tax investment tax credits.
Deferred Tax Investment Tax Credits
Property, Plant and Equipment, Gross, Period Increase (Decrease), Total
Property, Plant and Equipment, Gross, Period Increase (Decrease)
Increase in property, plant and equipment
Fair Value, Inputs, Level 3 [Member]
Level 3
Liabilities, Fair Value Disclosure [Abstract]
Liabilities
Insurance Contracts [Member]
Insurance Contracts [Member]
Insurance Contracts
Interest Paid, Capitalized, Investing Activity
Cash paid for interest, capitalized interest
Segment Reporting [Abstract]
Deferred Tax Liabilities, Property, Plant and Equipment
Depreciation method and plant basis differences
Capitalization, Long-Term Debt and Equity
Total capitalization
Real Estate Funds
Employee Benefit Plan, Real Estate [Member]
Liabilities, Current [Abstract]
Current Liabilities:
Benefit related to real estate transactions
Profit (Loss) from Real Estate Operations
Charge in connection with the electric base rate case
Regulatory Asset [Axis]
Regulatory Asset
Related Party Transactions [Abstract]
Rider D S M.
Rider D S M [Member]
DESC
Rider DSM [Member]
Basis
Derivative Notional Basis
Derivative notional basis.
Shares, Outstanding
Ending balance (in shares)
Beginning balance (in shares)
Operating Loss Carryforwards
Loss Carryforwards, Deductible Amount
Accounts Receivable, after Allowance for Credit Loss, Current
Accounts Receivable, after Allowance for Credit Loss, Current, Total
Customer, net of allowance for uncollectible accounts of $5 and $6
Regulatory Assets, Pension and Other Postretirement Benefit Plans, Amortization of Prior Service Cost, Net of Tax
Regulatory assets, pension and other postretirement benefit plans, amortization of prior service cost, net of tax.
Regulatory assets, pension and other postretirement benefit plans, amortization of prior service cost, net of tax
Lessee, Operating Lease, Renewal Term
Lease renewal term
Regulatory Liability, Current
Regulatory liabilities
Regulatory liability, current
Line of credit facility, maturity date, month and year.
Line Of Credit Facility Maturity Date Month And Year
Line of credit facility maturity date
Restricted Cash and Cash Equivalent
Restricted cash and equivalents
Restricted cash and equivalent balances
Restricted Cash and Cash Equivalents, Total
Interest Rate Contract [Member]
Interest Rate Contract [Member]
Commitments and Contingencies
Commitments and Contingencies
Lessee, Leases [Policy Text Block]
Leases
Defined Benefit Plan, Service Cost
Service cost
Other Energy Equipment [Member]
General and other [Member]
DESC
D E S C [Member]
DESC
Operating Lease, Liability
Operating lease liability
Present value of operating lease liabilities
Operating Lease, Liability, Total
Auditor Firm ID
Auditor Firm ID
Gas purchased for resale
Gain (Loss) On Gas Purchased For Resale
Gain (loss) on gas purchased for resale.
Forecast [Member]
Forecast
Short-Term Debt, Total
Short-Term Debt
Short-term borrowings
Common Stock, No Par Value
Common stock, par value
Depreciation, Amortization and Accretion, Net
Depreciation and amortization
Depreciation, Amortization and Accretion, Net, Total
SCANA corporation.
SCANA Corporation [Member]
SCANA Corporation
Inventory, Raw Materials and Supplies, Gross
Materials and supplies
Inventory, Raw Materials and Supplies, Gross, Total
Summary of weighted average remaining lease term and discount rate for operating and finance leases.
Summary Of Weighted Average Remaining Lease Term And Discount Rate For Operating And Finance Leases [Table Text Block]
Summary of Weighted-average Remaining Lease Term And Discount Rate for Operating and Finance Leases
End period for recovery
Regulatory Noncurrent Asset, End Date for Recovery
Turbine.
Turbine [Member]
Turbine [Member]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark
SCDOR.
S C D O R [Member]
SCDOR
Demand Side Management programs [Member]
Demand Side Managementprograms [Member]
Demand Side Management Programs [Member]
Long-Term Debt, Maturity, Year Two
2027
Fair Value Inputs Market Price
Fair value inputs market price.
Fair value inputs market price (per MWh)
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity, Primary Beneficiary [Member]
Proceeds from Legal Settlements
Proceeds from legal settlements of share of claims incurred in previous year
Finance Lease, Liability, Current
Finance lease liabilities - current
Finance Lease, Weighted Average Discount Rate, Percent
Weighted-average discount rate - finance leases
Liabilities, Noncurrent [Abstract]
Deferred Credits and Other Liabilities:
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
Finance Lease, Right-of-Use Asset, Accumulated Amortization
Finance lease assets, accumulated amortization
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net Income
Net income
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]
Included in earnings:
Accrued Income Taxes, Current
Taxes accrued
Number Of Reportable Segments Not Disclosed Flag
Number of reportable segments not disclosed flag.
Defined Benefit Plan, Shared Costs Deferred
Defined Benefit Plan Shared Costs Deferred
Defined benefit plan, shared costs deferred with joint ownership
Long-Term Debt, Type [Domain]
Long-Term Debt, Type
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]
Loss Contingencies [Table]
Loss Contingencies [Table]
Public utilities property plant and equipment requested cost of construction.
Public Utilities Property Plant And Equipment Requested Cost Of Construction
Proposed cost of project
Utility plant and non utility property.
Utility Plant And Non Utility Property [Abstract]
Scenario [Axis]
Increase decrease in accounts payable excluding affiliated related.
Increase Decrease In Accounts Payable Excluding Affiliated Related
Accounts payable
Interest Rate noncurrent Derivative Contract.
Interest Rate Non Current Derivative Contract [Member]
Interest Rate Swap Noncurrent [Member]
Regulatory assets, current year prior service cost, pension and other postretirement benefit plans, net of tax
Regulatory Assets, Pension And Other Postretirement Benefit Plans, Service Cost Arising During The Period, Net Of Tax
Regulatory assets, pension and other postretirement benefit plans, service cost arising during the period, net of tax.
Operating Revenue
Total Operating Revenues
External revenue
Regulatory Asset
Total regulatory assets
Stockholders' Equity, Other
Other
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation
Five Point Three One Percent Affiliated Note [Member]
Five Point Three One Percent Affiliated Note [Member]
5.31% Affiliated Note Due 2027
Segments [Axis]
Segments
Advanced Metering Infrastructure Project [Member]
Advanced Metering Infrastructure Project [Member]
Advanced Metering Infrastructure Project [Member]
Long-Lived Tangible Asset [Domain]
Long-Lived Tangible Asset
Asset Retirement Obligation, Liabilities Incurred
Liabilities incurred
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]
Derivative Asset, Not Subject to Master Netting Arrangement Deduction1
Derivative Asset, not subject to master netting arrangement deduction
Gross amounts not offset in the consolidated balance sheet, financial instruments
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Toshiba Settlement
Deferred Tax Asset, Legal Settlement
Deferred Tax Asset Legal Settlement
Comprehensive income (loss) available (attributable) to common shareholder
Comprehensive Income (Loss) Available To Common Shareholder
Comprehensive income (loss) available to common shareholder.
Comprehensive Income (Loss) Available (Attributable) to Common Shareholder
Long-Term Debt
Total long-term debt
Related Party Transactions Disclosure [Text Block]
Affiliated and Related Party Transactions
Gross Nonutility Property
Gross Nonutility Property [Member]
Gross nonutility property.
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)
Actuarial (gain) loss
Equity, Attributable to Parent
Total common equity
Stockholders' Equity Attributable to Parent, Beginning Balance
Stockholders' Equity Attributable to Parent, Ending Balance
Derivatives Not Designated as Hedging Instruments [Table Text Block]
Derivatives Not Designated as Hedging Instruments
Basis of Accounting, Policy [Policy Text Block]
General
Lessee, Operating Lease, Existence of Option to Extend [true false]
Option to extend, existence, operating lease
Schedule of related party transactions and other affiliates and related parties.
Schedule Of Related Party Transactions And Other Affiliates And Related Parties [Table Text Block]
Schedule of Affiliated Transactions
Unrecognized tax benefits income taxes related to affiliated payable
Unrecognized Tax Benefits Income Taxes Related To Affiliated Payable
Income taxes related to affiliated payable
Statement of Stockholders' Equity [Abstract]
Utility plant, net.
Utility Plant Net [Member]
Utility Plant, Net
Decommissioning Liability, Noncurrent
Decommissioning liability, noncurrent
Gross utility plant.
Gross Utility Plant [Member]
Total Gross Utility Plant
Fixed Income Securities [Member]
Fixed Income [Member]
Carbon regulations.
Carbon Regulations [Member]
Carbon Regulations
Long-Term Debt, Maturity, Year Five
2030
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Disclosures [Text Block]
Fair Value Measurements, Including Derivatives
Debt weighted average interest rate in year four.
Debt Weighted Average Interest Rate In Year Four
Weighted-average coupon, 2029
Schedule of input and assumptions used in measuring fair value.
Schedule of Input And Assumptions Used In Measuring Fair Value [Table Text Block}
Schedule of Input And Assumptions Used in Measuring Fair Value
NEIL aggregate maximum loss for any single loss occurrence.
N E I L Aggregate Maximum Loss For Any Single Loss Occurrence
NEIL aggregate maximum loss for any single loss occurrence
Commercial Paper Borrowing Limit
Commercial paper borrowing limit
Commercial paper borrowing limit
Public Utilities, Regulatory Proceeding [Domain]
Public Utilities, Regulatory Proceeding
Summary of cash paid for amounts included in measurement of lease liabilities in consolidated statements of cash flows.
Summary Of Cash Paid For Amounts Included In Measurement Of Lease Liabilities In Consolidated Statements Of Cash Flows [Table Text Block]
Cash Paid for Amounts Included in Measurement of Lease Liabilities
Noncontrolling Interest [Member]
Non-controlling Interest
Deferred tax assets excess deferred income taxes.
Deferred Tax Assets Excess Deferred Income Taxes
Excess deferred income taxes
Foreign Equity Securities [Member]
Foreign Equity Securities [Member]
Foreign Equity Securities
Debt Instrument, Name [Domain]
Debt Instrument, Name
Regulatory Asset [Domain]
Regulatory Asset
Gross amounts not offset in the consolidated balance sheet, net amounts
Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction
Assets [Member]
Assets
Other Assets, Current
Other current assets
Settlement Proceeds [Member]
Settlement Proceeds [Member]
Monetization Of Guaranty Settlement [Member]
Total recorded at NAV
Defined Benefit Plan Recorded At Net Annual Value
Amount of defined benefit plan, assets recorded at NAV.
Long-Term Debt, Maturity, Year Four
2029
Short term commercial paper maturity period.
Short Term Commercial Paper Maturity Period
Short term commercial paper maturity period
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Schedule of Unrecognized Tax Benefits Roll Forward
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Regulatory Liability
Total regulatory liabilities
Customer refundable fees, alternative plan
Asset Retirement Obligation Disclosure [Text Block]
Asset Retirement Obligations
Interest expense from money pool transactions
Interest Expense, Total
Interest charges, net of AFUDC of $32, $25 and $20
Represents the generation capacity (in MW) of the nuclear electric generation units.
Power Generation Capacity Megawatts
Power Generation Capacity Megawatts
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]
Entity [Domain]
Entity
Credit Facility [Axis]
Credit Facility
Nonutility property and investments.
Nonutility Property And Investments [Abstract]
Nonutility Property and Investments:
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block]
Interest Rate Hedges [Member]
Interest rate hedges.
Interest Rate Hedges [Member]
Current State and Local Tax Expense (Benefit)
State
Schedule of Expected Benefit Payments [Table Text Block]
Schedule of Expected Benefit Payments
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]
Finance Lease, Liability, to be Paid, Year One
Maturity of finance lease liabilities, 2026
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year
Defined benefit plan, expected contributions in 2026
Fair value inputs price volatility.
Fair Value Inputs Price Volatility
Fair value inputs price volatility
Schedule of Line of Credit Facilities [Table Text Block]
Schedule of Line of Credit Facilities
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
Operating Lease Liabilities, Payments Due [Abstract]
Affiliated receivables
Due From Affiliated Assets Noncurrent
Due from affiliated assets noncurrent.
Environmental Remediation Contingency [Axis]
Related Party
Related and Nonrelated Parties [Axis]
Taxes accrued
Increase (Decrease) in Income Taxes Payable
Increase in accrued taxes
Total
Pension And Other Postretirement Benefit Plans Regulatory Assets Before Tax
Pension and other postretirement benefit plans regulatory assets before tax.
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount
Other
Pension Plan [Member]
Pension Benefits [Member]
Property, Plant and Equipment, Policy [Policy Text Block]
Utility Plant
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
Current year actuarial (gain) loss
Remeasurement on Unrecognized Tax Benefits
Remeasurement on unrecognized tax benefits.
Remeasurement on unrecognized tax benefits
Entity Address, City or Town
Entity Address, City or Town
Finance Lease, Liability, to be Paid, after Rolling Year Five
Maturity of finance lease liabilities, after 2030
Income tax benefit reasonably possible to occur
Increase in Unrecognized Tax Benefits is Reasonably Possible
Schedule of Regulatory Assets and Liabilities [Text Block]
Rate and Other Regulatory Matters
Credit Facility [Domain]
Credit Facility
Utilities Operating Expense Maintenance And Operations Including Affiliated Expenses
Utilities Operating Expense Maintenance And Operations Including Affiliated Expenses
Other operations and maintenance
Type of Line
Kilo Volt Line 1
Kilo Volt Line.
Regulatory Agency [Axis]
Regulatory Agency
Long-Term Debt, Gross
Total principal
Total
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Other
Property, Plant and Equipment, Gross
Gross nonutility property
Property, Plant and Equipment, Gross, Total
Property, Plant and Equipment, Gross, Beginning Balance
Property, Plant and Equipment, Gross, Ending Balance
Measurement of groundwater withdrawals.
Measurement Of Groundwater Withdrawals
Measurement of groundwater withdrawals
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current:
Tax utilization expense (benefit) of operating loss carryforwards
Deferred federal income tax expense (benefit), tax utilization expense of operating loss carryforwards.
Deferred Federal Income Tax Expense Benefit Tax Utilization Expense Of Operating Loss Carryforwards
Debt, Weighted Average Interest Rate
Weighted-average coupon rate
Weighted-average coupon
Public Utility Property, Plant, and Equipment [Table Text Block]
Schedule of Weighted Average Depreciation Rates
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Income before income tax expense
Income before income tax expense
Concentration Risk Type
Concentration Risk Type [Domain]
Final Rule To Revise Effluent Limitations Guidelines For Steam Electric Power Generating Category [Member]
Final rule to revise effluent limitations guidelines for steam electric power generating category.
Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category
Asset Retirement Obligation Costs [Member]
Asset Retirement Obligation Costs [Member]
Asset Removal Costs
Finance Lease, Liability, to be Paid, Year Five
Maturity of finance lease liabilities, 2030
The Electric Operations segment is engaged in the generation, transmission, distribution and sale of electricity in South Carolina.
Electric Operations [Member]
Electric Operations
Stockholders' Equity Note [Abstract]
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Cash, restricted cash and equivalents at end of period
Cash, restricted cash and equivalents at beginning of period
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows
Interest Paid, Excluding Capitalized Interest, Operating Activity
Cash for interest paid (net of capitalized interest)
Interest paid (net of capitalized interest of $32, $25 and $20)
Measurement Basis [Axis]
Measurement Basis
Statistical Measurement [Domain]
Statistical Measurement
The sum of the tax effects as of the balance sheet date of the amount of the estimated future tax deductions arising from all employee compensation and benefits costs, which can only be deducted for tax purposes when the actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.
Deferred Tax Liabilities Tax Deferred Expense Compensation And Benefits Employee Benefits
Pension benefits
Affiliated amount for long term commitments in future.
Affiliated Amount For Long Term Commitments In Future
Affiliated amount for long term commitments
Production and other credits.
Production And Other Credits [Member]
Production and Other Credits
Cost, Maintenance
Turbine maintenance expense
Construction in Progress Expenditures Incurred but Not yet Paid
Accrued construction expenditures
Assets, Current
Total current assets
Total current assets
Document Period End Date
Document Period End Date
Document Period End Date
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV
Defined Contribution Plan, Cost
Defined contribution plan, employer matching contributions
ICFR Auditor Attestation Flag
ICFR Auditor Attestation Flag
Tax exempt financings.
Tax Exempt Financings [Member]
Tax Exempt Financings
Defined Benefit Plan, Benefit Obligation, Benefits Paid
Benefits paid
Litigation settlement through cash.
Litigation Settlement Through Cash
Litigation settlement through cash
Long-Term Purchase Commitment [Line Items]
Long Term Purchase Commitment [Line Items]
Total recorded at fair value
Defined Benefit Plan Assets In Fair Value Hierarchy
Defined benefit plan, assets in the fair value hierarchy.
Tax credit carryforwards, expiration year.
Tax Credit Carryforwards Expiration Year
Credit Carryforwards, Expiration Period
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
Amount accrued annually for nuclear fuel outages.
Amount Accrued Annually For Nuclear Fuel Outages
Amount accrued annually for nuclear fuel outages
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Energy Related Inventory
Fuel
Energy Related Inventory, Total
Statement of Financial Position [Abstract]
Loss Contingency Nature [Axis]
Solar Affiliates [Member]
Solar Affiliates [Member]
Solar Affiliates [Member]
Revenue [Policy Text Block]
Operating Revenue
Utilities Operating Expense, Impairments
Impairment of assets and other charges
Impairment of assets
Line of Credit [Member]
Line of Credit Facility
Public Utilities, Regulatory Proceeding
Public Utilities, Regulatory Proceeding [Axis]
Loss Contingency, Nature [Domain]
Deferred Tax Liabilities, Net
Total net deferred income tax liabilities
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant
Contributions
Operating loss carryforward, expiration year.
Operating Loss Carryforwards Expiration Year
Loss Carryforwards, Expiration Period
Capitalized Contract Cost, Amortization
Amortization
Total current expense (benefit)
Current Income Tax Expense (Benefit)
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Percentage of current authorized earned from return on equity.
Percentage Of Current Authorized Earned From Return On Equity
Percentage of current authorized earned ROE
Assets not offset in the consolidated balance sheet
Derivative Asset, Not Subject to Master Netting Arrangement
Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
Finance Lease Liabilities, Payments, Due [Abstract]
Schedule of lease assets and liabilities recorded in consolidated balance sheets.
Schedule Of Lease Assets And Liabilities Recorded In Consolidated Balance Sheets [Table Text Block]
Schedule of Lease Assets and Liabilities Recorded in Consolidated Balance Sheets
Not Designated as Hedging Instrument [Member]
Not Designated as Hedging Instrument [Member]
Not Designated as Hedging Instruments [Member]
Settlements of uncertain tax positions
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent, Total
Settlements of uncertain tax positions
Reserve for refunds to electric utility customers.
Reserve For Refunds To Electric Utility Customers [Member]
Reserve For Refunds To Electric Utility Customers [Member]
Maximum Insurance Coverage To Nuclear Facility For Property Damage And Outage Costs From Non-Nuclear Event
N E I L Maximum Insurance Coverage To Nuclear Facility For Property Damage And Outage Costs From Non Nuclear Event
NEIL maximum insurance coverage to nuclear facility for property damage and outage costs from non-nuclear event
Energy [Domain]
Asset Retirement Obligations, Noncurrent
Asset retirement obligations
Asset Retirement Obligations, Noncurrent, Total
Proceeds from Contributions from Parent
Contribution from parent
Contributions from parent
Supply Chain Financing [Policy Text Block]
Supply Chain Financing
Supply Chain Financing
Derivative Liability, Statement of Financial Position [Extensible Enumeration]
Defined Benefit Plan, Expected Return (Loss) on Plan Assets
Expected return on assets
Lessee, Operating Lease, Liability, to be Paid, Year Two
Maturity of operating lease liabilities, 2027
Other [Member]
Other Regulatory Assets (Liabilities) [Member]
Other Regulatory Assets Liabilities
Personal Injury or Wrongful Death Charges
Personal Injury or wrongful death charges.
Personal injury or wrongful death charges
Finance Lease, Right-of-Use Asset, Amortization
Finance lease cost, amortization
Indefinite-Lived Intangible Assets, Major Class Name [Domain]
Utilities Operating Expense, Gas and Petroleum Purchased
Gas purchased for resale
Utilities Operating Expense, Purchased Power
Purchased power
Represents South Carolina Generating Company, Inc., a wholly owned subsidiary of the entity.
GENCO [Member]
Genco
Securities Act File Number
Entity File Number
Payments of Ordinary Dividends, Common Stock
Dividend to parent
Cover [Abstract]
Derivative assets not subject to master netting or similar arrangements
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election1
Derivative asset, fair value, offset against collateral, net of not subject to master netting arrangement, policy election
Purchase Obligation, to be Paid, Year Five
Purchased electric capacity, 2030
Storm restoration, expected recovery.
Storm Restoration, Expected Recovery
Storm restoration expected recovery
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
Derivatives in Cash Flow Hedging Relationships
Settlements with tax authorities
Amount of increase or decrease in unrecognized tax benefits resulting from settlements with taxing authorities.
Unrecognized Tax Benefits Increases Decreases Resulting From Settlements With Taxing Authorities
Settlements with tax authorities
Tax credit and operating loss carryforward amount.
Tax Credit And Operating Loss Carryforward Amount
Loss and Credit Carryforwards, Deductible Amount
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis and included in Level 3
Gain Loss On Purchases
Gain loss on purchases.
Purchases
Environmental Remediation Contingency [Domain]
Defined benefit plan health care cost trend rate assumed.
Defined Benefit Plan Health Care Cost Trend Rate Assumed
Defined benefit plan, annual rate of increase in the per capita cost of covered health care benefits
Environmental Restoration Costs [Member]
Environmental Remediation Costs [Member]
Derivative, Gain (Loss) on Derivative, Net
Derivative, Gain (Loss) on Derivative, Net, Total
Amount of Gain (Loss) Recognized in Income on Derivatives
Scenario [Domain]
Number of Operating Segments
Number of primary operating segments
Defined Benefit Plan Pending Purchase Of Securities
Defined benefit plan pending purchase of securities.
Pending purchases of securities
Segment Reporting Disclosure [Text Block]
Operating Segments
Deferred tax assets DESC rate refund.
Deferred Tax Assets D E S C Rate Refund
DESC rate refund
Changes in fair value and payments of interest rate derivatives designated as cash flow hedge, amortized to interest expense, year.
Changes In Fair Value And Payments Of Interest Rate Derivatives Designated As Cash Flow Hedge Amortized To Interest Expense Year
Changes in fair value and payments of interest rate derivatives designated as cash flow hedge, amortized to interest expense, year
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation
Accumulated depreciation and amortization
Loss contingencies individual facilities circumstances period
Loss contingencies individual facilities circumstances period.
Loss contingencies individual facilities circumstances period
Debt instrument maturity year.
Debt Instrument Maturity Year
Debt Instrument, Maturity Year
New Accounting Standards
New Accounting Pronouncements, Policy [Policy Text Block]
Defined benefit plan, gain (loss) from change in discount rate.
Defined Benefit Plan Gain Loss From Change In Discount Rate
Gain (loss) from change in discount rate
Debt Premium Discount And Expense [Policy Text Block]
Debt Issuance Costs
Debt premium, discount, and expense.
Summary of Income Tax Payments (Net of Funds Received) [Table Text Block]
Summary of Income Tax Payments (Net of Funds Received).
Summary of Income Tax Payments (Net of Funds Received)
Charge in Connection With the Electric Base Rate
Charge in connection with the electric base rate case
Charge in connection with the electric base rate.
Jointly Owned Utility Plant, Proportionate Ownership Share
Jointly owned utility plant, proportionate ownership share
Asset Retirement Obligation, Liabilities Settled
Liabilities settled
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Effective Income Tax Rate, Amount
Reported Value Measurement [Member]
Carrying Amount
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate
Defined benefit plan, ultimate health care cost trend rate
Ultimate health care cost trend rate
Increase in asset retirement obligations
Increase (Decrease) in Asset Retirement Obligations
Receivable from affiliates
Affiliated and related party
Other Receivables, Net, Current
Other Receivables, Net, Current, Total
Increase in proposed non fuel base rate amount.
Increase In Proposed Non Fuel Base Rate Amount
Amount of Increase in proposed non fuel base rate
Lessee, Operating Lease, Term of Contract
Original term of leases
Common Stock, Shares, Outstanding
Common stock, shares outstanding
Common stock, shares outstanding
Common Stock, Shares, Outstanding, Beginning Balance
Common Stock, Shares, Outstanding, Ending Balance
Storm Costs [Member]
Deferred Storm Damage Costs [Member]
Operating Lease, Liability, Current
Operating lease liabilities - current
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Amortization of prior service cost
Cybersecurity Risk Management Processes Integrated [Flag]
Document Transition Report
Document Transition Report
Electric - Cost of Fuel [Member]
Electric Cost of Fuel [Member]
Electric Cost of Fuel.
Investment and other credits.
Investment And Other Credits [Member]
Investment and Other Credits
Asset Impairment Charges
Impairment of assets and other charges
Asset Impairment Charges, Total
South Carolina Regulation.
South Carolina Regulation [Member]
South Carolina Regulation
Lessee, Operating Leases [Text Block]
Leases
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Details of Income Tax Expense for Continuing Operations Including Noncontrolling Interests
Revenue Recognition and Deferred Revenue [Abstract]
Debt weighted average interest rate in year three.
Debt Weighted Average Interest Rate In Year Three
Weighted-average coupon, 2028
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Total Comprehensive Income
Total Comprehensive Income
Liability, Defined Benefit Plan, Noncurrent
Pension and other postretirement benefits
Liability, Defined Benefit Plan, Noncurrent, Total
Unrealized Gain (Loss) on Derivatives
Unrealized gains and losses
Statement of Cash Flows [Abstract]
Estimated environmental remediation activities at manufacturing gas plant sites
Site contingency estimated environmental remediation costs.
Site Contingency Estimated Environmental Remediation Costs
Estimated environmental remediation activities at MGP sites
Loss contingencies facility retirement period
Loss contingencies facility retirement period.
Loss Contingencies Facility Retirement Period
Current Federal Tax Expense (Benefit)
Federal
Assets, Fair Value Disclosure [Abstract]
Assets
Derivative Asset, Statement of Financial Position [Extensible Enumeration]
Equity [Text Block]
Equity
Percentage Of Earned Return On Equity
Percentage of earned return on equity.
Percentage of earned return on equity
unrecovered plant [Member]
Unrecovered Plant [Member]
Other Unrecovered Plant [Member]
Deferred Tax Liabilities, Other
Other
Cybersecurity Risk Management Processes Integrated [Text Block]
Net Income
Increase (Decrease) in Inventories
Inventories
Increase (Decrease) in Inventories, Total
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.
Gas Distribution Segment Member [Member]
Gas Distribution
V.C. Summer nuclear power station unit 1.
V C Summer Nuclear Power Station Unit One [Member]
Summer Unit 1
Affiliated long term debt.
Affiliated Long Term Debt
Affiliated long-term debt
Other Nonoperating Income
Other income
Operating Lease, Cost
Operating lease cost
NEIL maximum retrospective premium assessment.
N E I L Maximum Retrospective Premium Assessment
NEIL maximum retrospective premium assessment
Offsetting Liabilities [Table Text Block]
Offsetting Liabilities
Estimated electric transmission project cost.
Estimated Electric Transmission Project Cost
Estimated electric transmission project cost
Deferred tax Nuclear Decommissioning
Deferred Tax Nuclear Decommissioning
Nuclear decommissioning
Proceeds from (Payment for) Other Financing Activity
Other
Number of separate petitions for reconsideration granted
Loss Contingency Number Of Separate Petitions For Reconsideration Granted
Loss contingency number of separate petitions for reconsideration granted.
Litigation Settlement, Amount Awarded to Other Party
Litigation settlement expense awarded
Purchase Obligation
Purchased electric capacity, Total
Operating Lease, Payments
Operating cash flows from operating leases
Asset Retirement Obligation, Revision of Estimate
Revisions in estimated cash flows
Revision related to nuclear decommissioning cost
Assets [Abstract]
ASSETS
Construction in Progress [Member]
Construction Work In Progress
Increase (Decrease) in Prepaid Expense and Other Assets
Prepayments and deposits, net
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit
Recognized actuarial gain (loss)
Recognized actuarial gain (loss)
Regulated Operating Revenue, Other
Other revenues
Document Fiscal Year Focus
Document Fiscal Year Focus
Deferred federal income tax expense (benefit) before operating loss carryforwards, investment tax credits and tax reform.
Deferred Federal Income Tax Expense Benefit Before Operating Loss Carryforwards Investment Tax Credits And Tax Reform
Taxes before operating loss carryforwards and investment tax credits
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Investing Activities
Retirement Benefits [Abstract]
Accounts Payable, Current
Accounts payable
Accounts Payable, Current, Total
Interest charges
Interest charges, net of AFUDC
Interest Expense, Nonoperating, Total
Interest Expense, Nonoperating
Deferred income taxes and investment tax credits.
Deferred Income Taxes And Investment Tax Credits
Deferred income taxes and investment tax credits
Total deferred taxes and deferred investment tax credits
Schedule of Net Benefit Costs [Table Text Block]
Components of Net Periodic Benefit Cost
NND project costs.
N N D Project Costs [Member]
NND Project Costs [Member]
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
Schedule of Changes in Fair Value of Plan Assets
Transaction Type [Axis]
Transaction Type
Utility plant and non utility property.
Utility Plant And Non Utility Property [Line Items]
Utility Plant And Non Utility Property [Line Items]
Utilities Operating Expense, Fuel Used
Fuel used in electric generation
Fair Value Measurement, Policy [Policy Text Block]
Fair Value Measurements
Purchase Obligation, to be Paid, Year One
Purchased electric capacity, 2026
Private Equity Funds [Member]
Private Equity Funds
Public Utilities, Approved Rate Increase (Decrease), Amount
South Carolina Commission Order, Annual DSM Program Rate Rider Recovery Amount
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase
Assumed annual rate of future salary increases for projected benefit obligation
Fair Value Disclosures [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Derivative [Member]
Derivatives [Member]
Offsetting Assets [Table Text Block]
Offsetting Assets
Gas Purchased for Resale [Member]
Gas Purchased For Resale [Member]
Gas purchased for resale.
Lessee, Operating Lease, Liability, to be Paid, Year One
Maturity of operating lease liabilities, 2026
Proportional share percentage in settlement amount.
Proportional Share Percentage In Settlement Amount
Proportionate ownership share in project
Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.
Schedule Of Assumptions Used To Determine Benefit Obligations [Table Text Block]
Schedule of Assumptions Used to Determine Benefit Obligations
Electric Transmission [Member]
Transmission [Member]
increase decrease in derivatives affecting regulatory assets and liabilities
Increasedecreaseinderivativesaffectingregulatoryassetsandliabilities
Increase (Decrease) in Derivatives Subject to Regulatory Treatment
Regulated Entity, Other Assets, Noncurrent
Total deferred debits and other assets
Total deferred debits and other assets
Income Tax Examination, Description
Income tax examination, description
Line of credit, outstanding
Long-Term Line of Credit
Long-Term Line of Credit, Total
Lease Description [Line Items]
Lease description.
Increase In Proposed Base Rate Amount
Increase in proposed base rate amount.
Increase in proposed base rate amount
Significant Accounting Policies [Table]
Significant Accounting Policies [Table]
Significant Accounting Policies [Table]
Debt Instrument [Axis]
Debt Instrument
Environmental Protection Agency And State Regulatory Agencies [Member]
Environmental protection agency and state regulatory agencies.
Environmental Protection Agency And State Regulatory Agencies
Derivative Instrument [Axis]
Derivative Instrument
Percentage Of Undivided Interest Owned In The Plant And Electrical Output
Percentage of undivided interest owned in the plant and electrical output.
Percentage of undivided interest owned in the plant and electrical output
Derivative Financial Instruments, Assets [Member]
Assets [Member]
Lessee, Operating Lease, Liability, to be Paid, after Year Five
Maturity of operating lease liabilities, after 2030
Defined Benefit Plan, Interest Cost
Interest cost
Assets, Fair Value Disclosure
Total assets
Total assets
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress
Construction work in progress, jointly owned utility plant
Derivatives, Policy [Policy Text Block]
Derivative Instruments
Concentration Risk, Percentage
Concentration risk percentage
Defined Benefit Plan, Expected Future Benefit Payment, Year One
Defined benefit plan, expected benefit payments, 2026
Gain from transferred utility property after-tax
Gain from Transferred Utility Property After Tax
Gain from transferred utility property after tax.
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Net cash used in investing activities
Finance Lease, Weighted Average Remaining Lease Term
Weighted-average remaining lease term - finance leases
Schedule of Segment Reporting Information, by Segment [Table]
Schedule Of Segment Reporting Information By Segment [Table]
Nuclear Fuel [Member]
Nuclear Fuel
Commingled funds/collective trust funds
Compensation and Benefits Trust
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Derivative Financial Instruments
Income Tax Paid, by Individual Jurisdiction [Table]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3
Transfers out of Level 3
Transfers out of Level 3
Related and Nonrelated Parties [Domain]
Related Party
Public Utilities, Property, Plant and Equipment, Plant in Service
Utility plant in service
Public Utilities, Property, Plant and Equipment, Plant in Service, Total
Long-Term Debt, Maturity, after Year Five
Thereafter
Income Tax Disclosure [Text Block]
Income Taxes
Tax exempt financings variable rate due two thousand and thirty eight.
Tax Exempt Financings Variable Rate Due Two Thousand And Thirty Eight [Member]
Tax Exempt Financings Variable Rate Due 2038
Commercial Paper
Outstanding Commercial Paper
Debt weighted average interest rate after year five.
Debt Weighted Average Interest Rate After Year Five
Weighted-average coupon, Thereafter
Charge in Connection With the Electric Base Rate After Tax
Charge in connection with the electric base rate case, after tax
Charge in connection with the electric base rate after tax.
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Other Liabilities, Noncurrent
Other
Consolidated Entities [Axis]
Consolidated Entities
Finance Lease, Right-of-Use Asset, after Accumulated Amortization
Finance lease assets
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total
Legal Entity [Axis]
Legal Entity
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Changes in certain assets and liabilities:
Purchase Obligation, to be Paid, Year Four
Purchased electric capacity, 2029
Property, Plant and Equipment [Table Text Block]
Property, Plant and Equipment
Letters of Credit Outstanding, Amount
Outstanding Letters of Credit
Defined Benefit Plan, Plan Assets, Amount
Fair value of plan assets
Beginning balance
Ending balance
Insurance Settlements Receivable
Insurance receivable
Income Tax Disclosure [Abstract]
Fair Value, Recurring and Nonrecurring [Table]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]
Balance at December 31,
Balance at January 1,
Unrecognized Tax Benefits
Unrecognized tax benefits
Deferred Tax Liabilities Valuation Allowance
Deferred Tax Liabilities Valuation Allowance
Valuation allowances
Fair Value Inputs Market Price Per Decatherm
Fair value inputs market price per decatherm.
Fair value inputs market price per decatherm
Commercial.
Commercial [Member]
Commercial
Dominion Energy South Carolina [Member]
Dominion Energy South Carolina, Inc. [Member]
Dominion energy south Carolina.
Measurement Frequency [Domain]
Measurement Frequency
Hydroelectric Facilities [Member]
Hydroelectric facilities.
Hydroelectric Facilities
Benefit related to real estate transactions, after tax
Profit Loss From Real Estate Operations After Tax
Profit loss from real estate operations after tax.
Charge in connection with the electric base rate case, after tax
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
Statement of Income Location, Balance [Axis]
Income Statement Location
Related Party Transaction [Table]
Schedule Of Related Party Transactions By Related Party [Table]
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Table]
Income Tax Examination, Penalties Expense
Proposed assessment amount from SCDOR audit
Schedule of defined benefit plan, amounts recognized in regulatory assets [Table Text Block].
Schedule Of Defined Benefit Plan Amounts Recognized In Regulatory Assets [Table Text Block]
Schedule of Amounts Recognized in Regulatory Assets
Subsequent Event Type [Axis]
Property, Plant and Equipment, Planned Major Maintenance Activities, Policy [Policy Text Block]
Major Maintenance
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Financing Activities
Related Party Transaction, Purchases from Related Party
Purchases from affiliate
Fair Value, Recurring [Member]
Fair value, recurring
Lessee, Operating Lease, Liability, to be Paid
Maturity of operating lease liabilities, total undiscounted lease payments
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Operating lease liabilities, present value adjustment
Electric generating stations with water withdrawals under CWA.
Electric Generating Stations With Water Withdrawals Under C W A
Electric generating stations with water withdrawals under CWA
Equity Components [Axis]
Equity Components
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]
Income Statement Policy [Policy Text Block]
Statement of Operations Presentation
Income statement policy.
Nonoperating Income (Expense)
Nonoperating Income (Expense), Total
After- tax net income (loss)
Equity Component [Domain]
Equity Component
Asset Class [Axis]
Long term debt including capital lease.
Long Term Debt Including Capital Lease
Long-term debt, net
Document Annual Report
Document Annual Report
Business Combination [Axis]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase
Rate of compensation increase
Customer [Axis]
Customer
Defined benefit plan, actuarial gain (loss) in discount rate offset
Defined Benefit Plan, Actuarial Gain (Loss) in Discount Rate Offset
Defined benefit plan, actuarial gain (loss) in discount rate offset.
Debt Funds [Member]
Debt funds.
Debt Funds
Reclass Other Taxes - nonconsolidated affiliate
Reclass Other Taxes Nonconsolidated Affiliate
Operating Expenses – Other taxes from affiliate
US Treasury and Government [Member]
Government Securities
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount, Total
Changes in unrecognized tax benefits
Accounts and Other Receivables, Net, Current
Amounts due from Santee Cooper for share of direct expenses
Other
Effective Income Tax Rate Reconciliation, Reversal Of Excess Deferred Income Taxes, Amount
Effective income tax rate reconciliation, reversal of excess deferred income taxes, amount.
Reversal of excess deferred income taxes
Utilities Operating Expense, Maintenance and Operations
Other operations and maintenance
Utilities operating expense, maintenance and operations
Utilities Operating Expense, Maintenance and Operations, Total
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits
Pension and other postretirement benefits
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits, Total
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year
Health care cost trend rate
Maximum [Member]
Maximum [Member]
Maximum [Member]
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset
Margin liabilities with cash collateral
Gross amounts not offset in the consolidated balance sheet, cash collateral received
Noncurrent Derivative Assets [Member]
Noncurrent derivative assets.
Noncurrent Derivative Assets [Member]
Liabilities, Fair Value Disclosure
Total liabilities
Total liabilities
Statistical Measurement [Axis]
Statistical Measurement
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits
Other postretirement benefits
Prepaid Expense, Current
Prepayments
Prepaid Expense, Current, Total
Number of stations inactive subject to final rule.
Number of Stations Inactive Subject to Final Rule
Number of stations inactive subject to final rule
Common Stock, Value, Issued
Common Stock - no par value
Bonds ratio.
Bonds Ratio
Finance Lease, Principal Payments
Financing cash flows from finance leases
Rate and other regulatory matters.
Rate And Other Regulatory Matters [Line Items]
Rate And Other Regulatory Matters [Line Items]
Number of DESC facilities subject to final regulations.
Number Of D E S C Facilities Subject To Final Regulations
Number of DESC facilities subject to final regulations
Derivative Asset, Current
Derivative assets
Other Debt
Other Debt [Member]
Other Debt
Increase (Decrease) in Commodity Contract Assets and Liabilities
Net realized and unrealized changes related to commodity derivative activities
Equity, Including Portion Attributable to Noncontrolling Interest
Ending balance
Beginning balance
Total equity
Fair value of certain remaining utility property transferred
Remaining Utility Properties1
Remaining utility properties.
Purchased power
Gain Loss on Purchased Power
Gain (Loss) on purchased power.
Clean Water Act [Member]
Clean water act.
CWA
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Other Comprehensive Income:
Deferred Tax Assets, Operating Loss Carryforwards
Loss Carryforwards, Deferred Tax Asset
Deferred Tax Assets, Operating Loss Carryforwards, Total
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax
Total recognized in other comprehensive income
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax, Total
Tax Credit Carryforward [Axis]
Tax Credit Carryforward
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase
Purchases
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
State taxes, net of federal benefit
State and local income taxes, net of federal income tax effect
Number Of Mandatory Facility Specific Factors
Number of mandatory facility-specific factors
Number of mandatory facility specific factors
Utilities Operating Expense, Taxes
Other taxes
Preferred Stock, Shares Authorized
Preferred stock, shares authorized
Interest Payable, Current
Interest accrued
Deferred Income Tax Charge [Member]
Income Taxes Refundable Through Future Rates [Member]
Capitalized Related Costs
Capitalized Related Costs
Capitalized expenditures
Schedule of Debt [Table Text Block]
Schedule of Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Derivative Financial Instruments, Liabilities [Member]
Liability [Member]
Revenue from Contract with Customer [Text Block]
Operating Revenue
[Line Items] for Significant Accounting Policies [Table]
Significant Accounting Policies [Line Items]
Significant Accounting Policies
Number Of Optional Facility Specific Factors
Number of optional facility-specific factors.
Number of optional facility specific factors
Entity Registrant Name
Entity Registrant Name
Debt Disclosure [Text Block]
Long-Term and Short-Term Debt
Entity Voluntary Filers
Entity Voluntary Filers
Short-term debt including capital lease obligations.
Short Term Debt Including Capital Lease Obligations
Securities due within one year
Liability, Other Postretirement Defined Benefit Plan, Noncurrent
Noncurrent liability
Other Nonoperating Income (Expense)
Other income (expense), net
Other income, net
Other income (expense), net
Deferred State and Local Income Tax Expense (Benefit)
State
Payment for (Proceeds from) Investments and Sales or Disposals of Assets, Including Asset Retirement Costs
Proceeds from investments and sales or disposals of assets, including asset retirement costs
Payment for proceeds from investments and sales or disposals of assets, including asset retirement costs.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Components of Other Income (Expense), Net
Consolidated Entities [Domain]
Consolidated Entities
Public utilities significant emission rate per year CO2 equivalent.
Public Utilities Significant Emission Rate Per Year C O2 Equivalent
Significant emission rate per year CO2 equivalent
Income Tax Expense (Benefit)
Income tax expense (benefit)
Income tax expense
Total income tax expense
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage
US Equity Securities [Member]
Us Equity Securities [Member]
US Equity Securities
Measurement Frequency [Axis]
Measurement Frequency
Defined Benefit Plan, Expected Future Benefit Payment, Year Five
Defined benefit plan, expected benefit payments, 2030
Prior service cost
Pension And Other Postretirement Benefit Plans Regulatory Assets Net Prior Service Costs Credit Before Tax
Pension and other postretirement benefit plans regulatory assets net prior service costs credit before tax.
Deferred transmission operating costs.
Deferred Transmission Operating Costs [Member]
Deferred Transmission Operating Costs [Member]
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Schedule of Sensitivity of The Fair Value Measurements To Changes in The Significant Unobservable Inputs
Utility plant and non utility property disclosure.
Utility Plant And Non Utility Property Disclosure [Text Block]
Utility Plant and Nonutility Property
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Heightened entrainment analysis under CWA.
Heightened Entrainment Analysis Under C W A
Electric generating stations with water withdrawals with heightened entrainment analysis under CWA
Liability Class [Axis]
Public Utilities, Allowance for Funds Used During Construction, Rate
Public utilities, allowance for funds used during construction, rate
Other Income and Other Expense Disclosure [Text Block]
Other Income (Expense), Net
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total
Accumulated other comprehensive loss
Consolidation Items [Axis]
Consolidation Items
Industrial.
Industrial [Member]
Industrial
Federal limit on public liability claims from nuclear incident.
Federal Limit On Public Liability Claims From Nuclear Incident
Maximum liability protection per nuclear incident amount
Defined Benefit Plan, Equity Securities, Common Stock [Member]
Public Equity [Member]
Capital expenditures
Payments to Acquire Property, Plant, and Equipment
Property additions and construction expenditures
Payments to Acquire Property, Plant, and Equipment, Total
Effective income tax reconciliation reversal of excess deferred income taxes.
Effective Income Tax Reconciliation Reversal Of Excess Deferred Income Taxes
Reversal of excess deferred income taxes
Reversal of excess deferred income taxes
Payment for (Proceeds from) Other Investing Activity
Other
Consecutive period for bond ratio.
Consecutive Period For Bond Ratio
Consecutive months for bond ratio
Assets
Total assets
Total assets
Inventory, Policy [Policy Text Block]
Inventories
Property, Plant and Equipment [Table]
Schedule Of Property Plant And Equipment [Table]
Payments for (Proceeds from) Investments, Total
Payments for (Proceeds from) Investments
Purchase of investments
Income Tax Paid, State and Local, after Refund Received
Income Tax Paid, State and Local, after Refund Received, Total
South Carolina
V.C. Summer nuclear power station.
V C Summer Nuclear Power Station [Member]
Summer [Member]
Income Statement [Abstract]
Purchased Power [Member].
Purchased Power [Member]
Purchased Power [Member]
Increase In Proposed Base Rate Percentage
Increase in proposed base rate percentage.
Increase in proposed base rate percentage
Finance Lease, Interest Payment on Liability
Operating cash flows from finance leases
Disclosure of the fair value of defined benefit plan assets by the level within the fair value hierarchy in which the fair value measurements fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (level 1), significant other observable inputs (level 2), and significant unobservable inputs (level 3).
Schedule Of Fair Value Of Plan Assets By Measurement Levels [Table Text Block]
Schedule of Fair Value Measurements By Category
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions
Decreases-prior period positions
Amortization of actuarial losses (gains)
Defined Benefit Plan, Amortization of Gain (Loss)
Amortization of actuarial losses
Non interest-bearing cash
Defined Benefit Plan Non Interest Bearing Cash
Defined benefit plan non interest bearing cash
Preferred Stock, No Par Value
Preferred stock, par value
Deferred Income Tax Expense (Benefit)
Deferred income taxes, net
Deferred Income Tax Expense (Benefit), Total
Weighted Average [Member]
Weighted Average
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election1
Derivative liability, fair value, offset against collateral, net of not subject to master netting arrangement, policy election
Derivative liability not subject to master netting or similar arrangements
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Schedule of Segment Reporting Information, by Segment
Operating Segments [Member]
Operating Segment
Operating Segments
Long-Term Purchase Commitment [Table]
Long Term Purchase Commitment [Table]
Line of credit facility outstanding fee percentage.
Line Of Credit Facility Outstanding Fee Percentage
Line of credit facility, commitment fee percentage
Regulatory asset recovery assessment end period
Regulatory Asset Recovery Assessments
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate, U.S. Statutory Rate
Title of 12(g) Security
Title of 12(g) Security
Dividend to parent
Dividend to parent
Dividends, Common Stock
Dividends, Common Stock, Total
City Area Code
City Area Code
Natural Gas Rates [Member]
Natural Gas Rates.
Auditor Name
Auditor Name
Joint revolving credit facility.
Joint Revolving Credit Facility [Member]
Joint Revolving Credit Facility
Finance Lease, Liability, Noncurrent
Finance lease liabilities - noncurrent
Finance leases
EMANI maximum insurance coverage for property damage and outage costs
E M A N I Maximum Insurance Coverage For Property Damage And Outage Costs
E M A N I maximum insurance coverage for property damage and outage costs.
Debt Instrument, Face Amount
Debt instrument, face amount
Gain from transferred remaining utility property
Gain Related To Litigation Settlement On Transfer of Remaining Property
Gain related to litigation settlement on transfer of remaining property.
Non cash operating leases obligation incurred.
Non Cash Operating Leases Obligation Incurred
Operating leases
Line of Credit Facility, Maximum Borrowing Capacity
Facility limit
Deferred Income Taxes and Other Assets [Abstract]
Deferred income taxes:
DES.
DES [Member]
DES
Defined Benefit Plan [Table]
Schedule Of Defined Benefit Plans Disclosures [Table]
Other Intangible Assets [Member]
Intangible
Defined benefit plan assumptions used calculating net periodic benefit cost year achieved.
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Year Achieved
Year achieved
Deferred Tax Assets, Tax Credit Carryforwards
Credit Carryforwards, Deferred Tax Asset
Deferred Tax Assets, Tax Credit Carryforwards, Total
Utility Plant [Domain]
Utility Plant
Gain (Loss) from Litigation Settlement
Settlements
Cash payment
Cash Payment For Settlements
Cash Payment For Settlements
Litigation Case [Axis]
Litigation Case
Operating Lease, Weighted Average Remaining Lease Term
Weighted-average remaining lease term - operating leases
Summary of Tax Credit Carryforwards [Table Text Block]
Summary of Tax Credit Carryforwards
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Defined Benefit Plans Net Accrued Income
Defined benefit plans net accrued income.
Net accrued income
Lease, Cost
Total lease cost
Gross liabilities presented in the consolidated balance sheet
Derivative Liability, Subject to Master Netting Arrangement, before Offset
Total liabilities, fair value
Letter of Credit [Member]
Letter of Credit
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash, Restricted Cash and Equivalents
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax
Deferred cost of employee benefit plans, tax
Derivative Liability, Current
Derivative liabilities
Property, Plant and Equipment, Net
Nonutility property, net of accumulated depreciation
Property, Plant and Equipment, Net, Total
Property, plant and equipment, net
Tax exempt financings three point six two five and four due two thousand and twenty eight and two thousand thirty three.
Tax Exempt Financings Three Point Six Two Five And Four Due Two Thousand And Twenty Eight And Two Thousand Thirty Three [Member]
Tax Exempt Financings 3.625% and 4.00% Due 2028 and 2033
Defined Benefit Plan, Expected Future Benefit Payment, Year Three
Defined benefit plan, expected benefit payments, 2028
Regulatory Liability, Noncurrent
Regulatory liabilities
Regulatory liability, noncurrent
Operating Income (Loss)
Operating income
Operating income
Discount rate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate
Gas domestic regulated revenues affiliate.
Gas Domestic Regulated Revenues Affiliate
Operating Revenues – Gas from sales to affiliate
Retained Earnings [Member]
Retained Earnings
Cash Equivalents and Other [Member]
Cash equivalents and other.
Cash Equivalents and Other [Member]
Gain from transferred utility property
Gain from Transferred Utility Property
Gain from transferred utility property.
Cash and Cash Equivalents [Axis]
Transaction [Domain]
Transaction
Carrying amount as of the balance sheet date of natural gas in storage, which is a mixture of gases (liquefied or otherwise), used for fuel and manufacturing purposes, which is ready for sale.
Energy Related Inventory Natural Gas In Stored
Gas storage
Asset Retirement Obligation Nuclear Decommissioning
Asset Retirement Obligation Nuclear Decommissioning
Asset retirement obligation, nuclear decommissioning
Liabilities, Noncurrent
Total deferred credits and other liabilities
Regulatory assets, pension and other postretirement benefit plans, net unamortized gain (loss) arising during the period, net of tax
Regulatoryassetspensionandotherpostretirementbenefitplansnetunamortizedgainlossarisingduringtheperiodnetoftax
Regulatory assets, pension and other postretirement benefit plans, net unamortized gain (loss) arising during the period, net of tax
Long-Term Debt and Lease Obligation
Total long-term debt
Operating Lease, Weighted Average Discount Rate, Percent
Weighted-average discount rate - operating leases
Operating Lease, Liability, Noncurrent
Operating lease liabilities - noncurrent
Fair Value, Inputs, Level 1 [Member]
Level 1
Public Utility [Axis]
Public Utility
Class of Stock [Line Items]
Class Of Stock [Line Items]
Net cash provided by (used in) financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Lease, Cost [Table Text Block]
Summary of Total Lease Cost
Auditor Location
Auditor Location
Gas and electric distribution.
Gas and Electric Distribution [Member]
Distribution [Member]
Investments, Fair Value Disclosure
Investments
Total investments
Represents the maximum amount of insurance coverage to nuclear facility for property damage and outage costs provided by policies maintained by the entity.
N E I L Maximum Insurance Coverage To Nuclear Facility For Property Damage And Outage Costs
NEIL maximum insurance coverage to nuclear facility for property damage and outage costs
Total investments
Alternative Investment
Alternative investments
Derivative Liability, Noncurrent
Derivative liabilities
Derivative Contract [Domain]
Derivative Contract
Trade and Other Accounts Receivable, Unbilled Receivables, Policy [Policy Text Block]
Receivables
Corporate Debt Securities [Member]
Corporate Debt Securities
Income Tax Jurisdiction [Domain]
Income Tax Authority
Entity Interactive Data Current
Entity Interactive Data Current
Defined Benefit Plan, Plan Assets, Category [Axis]
Defined Benefit Plan, Plan Assets, Category
Statement of Income Location, Balance [Domain]
Income Statement Location
Fair Value Measurement [Domain]
Fair Value Measurement
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Operating Activities
Gas Transmission Equipment [Member]
Transmission [Member]
Electric service customers recovery period.
Electric Service Customers Recovery Period
Electric service customers recovery period
Removal Costs [Member]
Asset Removal Costs [Member]
Finance Lease [Member]
Finance lease.
Finance Lease
Rate and other regulatory matters.
Rate And Other Regulatory Matters [Table]
Rate And Other Regulatory Matters [Table]
Storm restoration expected recovery period.
Storm Restoration Expected Recovery Period
Storm restoration expected recovery period
Unbilled revenues
Unbilled Receivables, Current
Proceeds from short-term borrowings affiliate, net.
Proceeds From Short Term Borrowings Affiliate Net
Short-term borrowings – affiliated, net
Deferred Federal, State and Local, Tax Expense (Benefit)
Total deferred expense
Entity Tax Identification Number
Entity Tax Identification Number
Revenues [Abstract]
Regulated Operation, Regulatory Asset [Table]
Schedule Of Regulatory Assets [Table]
Residential.
Residential [Member]
Residential
Long-Term Debt, Type [Axis]
Long-Term Debt, Type
Increase (Decrease) in Due from Related Parties, Current
Receivables – affiliated and related party
Increase (Decrease) in Due from Related Parties, Current, Total
Utilities Operating Expense
Total operating expenses
Construction work in progress
Construction in Progress, Gross
Local Phone Number
Local Phone Number
Defined Benefit Plan Pending Sale Of Securities
Defined benefit plan pending sale of securities.
Pending sales of securities
Nuclear Decommissioning [Policy Text Block]
Nuclear Decommissioning
Nuclear decommissioning.
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Defined benefit plan, net periodic benefit (credit) cost
Net periodic benefit cost
Affiliated and related party payables and other
Other Liabilities, Current
Other
Short-Term Lease, Cost
Short-term lease cost
Regulatory Liability [Line Items]
Regulatory Liabilities
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax
Deferred cost of employee benefit plans, net of tax
Auditor Opinion [Text Block]
Auditor Opinion
Schedule of Net Funded Status [Table Text Block]
Schedule of Net Funded Status
Finance Lease, Liability, to be Paid, Year Two
Maturity of finance lease liabilities, 2027
Public utilities property plant and equipment plant in service exclude construction work in progress and nuclear fuel.
Public Utilities Property Plant And Equipment Plant In Service Exclude Construction Work In Progress And Nuclear Fuel
Utility plant in service
Unrecognized Tax Benefits, Interest on Income Taxes Expense
Interest expense
Accounting Policies [Abstract]
Service contract term.
Service Contract Term
Service Contract, Term
Real estate transfer to satisfy obligation under settlement.
Real Estate Transfer To Satisfy Obligation Under Settlement
Real estate transfer to satisfy obligation under settlement
Increase (Decrease) in Regulatory Liabilities
Regulatory liabilities
Disaggregation of Revenue [Line Items]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax
Operating revenue from contracts with customers
Operating revenue from contracts with customers
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]
Guarantee obligation
Guarantor Obligations, Maximum Exposure, Undiscounted
Public Utilities, Requested Rate Increase (Decrease), Amount
Amount of increase in base rate
Inventory, Net [Abstract]
Inventories (at average cost):
Deferred tax asset federal benefit of deferred state income taxes.
Deferred Tax Asset Federal Benefit Of Deferred State Income Taxes
Federal benefit of deferred state income taxes
Additional Collateral, Aggregate Fair Value
Additional collateral to its counterparties
Lessee, Operating Lease, Liability, to be Paid, Year Four
Maturity of operating lease liabilities, 2029
Commercial Paper [Member]
Commercial Paper
Federal Income Tax Note [Table]
Federal Income Tax Note [Table]
Dominion Energy.
Dominion Energy [Member]
Dominion Energy [Member]
Dominion Energy
Deferred Tax Liabilities State Income Taxes
Deferred Tax Liabilities State Income Taxes
Deferred state income taxes
Stock, Class of Stock [Table]
Schedule Of Stock By Class [Table]
Entity Emerging Growth Company
Entity Emerging Growth Company
Indefinite-Lived Intangible Assets [Axis]
South Carolina Commission [Member]
South Carolina Commission Member
South Carolina Commission.
Tax Credit Carryforward, Name [Domain]
Tax Credit Carryforward, Name