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Related-Party Transactions (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Amounts due to Dominion, noncurrent |  |  | $ 7,655,000,000 |  | $ 7,655,000,000 |  | $ 6,963,000,000 | [1]
Payable to affiliates | [2] |  | 1,655,000,000 |  | 1,655,000,000 |  | 1,697,000,000 | [1]
Borrowing Interest Charges |  |  | 27,000,000 |  | 72,000,000 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Amounts due to Dominion, noncurrent | [3] |  | 5,503,000,000 |  | 5,503,000,000 |  | 4,783,000,000 | [4]
Payable to affiliates |  |  | 1,213,000,000 |  | 1,213,000,000 |  | 1,176,000,000 | [4]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries |  |  | $ 0 |  | $ 0 |  | 0 |
Stock Issued During Period Shares New Issues |  |  | 0 | 0 | 0 | 0 |  |
Commencing Period |  | 20 months |  |  |  |  |  |
Lease commencement term |  | 2025-08 |  |  |  |  |  |
Related party transaction costs |  | $ 240,000,000 |  |  |  |  |  |
Cost of Revenue, Related Party, Type [Extensible Enumeration] |  | Affiliated Entity |  |  |  |  |  |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Derivative assets |  |  | $ 2,000,000 |  | $ 2,000,000 |  | 33,000,000 |
Derivative liabilities |  |  | 56,000,000 |  | 56,000,000 |  | 31,000,000 |
Virginia Electric and Power Company | Affiliated Entity | Pension Benefits | Amounts Associated With Dominion Pension Plan |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Amounts due to Dominion, noncurrent |  |  | 447,000,000 |  | 447,000,000 |  | 422,000,000 |
Virginia Electric and Power Company | Affiliated Entity | Medical Coverage for Local retirees | Amounts Associated with the Dominion Retiree Health and Welfare Plan |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent |  |  | 566,000,000 |  | 566,000,000 |  | 518,000,000 |
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Payable to affiliates |  |  | $ 1,800,000,000 |  | $ 1,800,000,000 |  | $ 2,000,000,000 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date and recast for certain events as discussed in Note 1.
[2] | See Note 10 for amounts attributable to related parties.
[3] | See Note 19 for amounts attributable to affiliates.
[4] | Virginia Power’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.

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