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Related-Party Transactions (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Amounts due to Dominion, noncurrent |  | $ 1,296,000,000 |  | $ 1,296,000,000 |  | $ 1,755,000,000 | [1]
Borrowing Interest Charges |  | 17,000,000 | $ 27,000,000 | 23,000,000 | $ 72,000,000 |  |
Dividend paid |  | 559,000,000 | $ 559,000,000 | 1,678,000,000 | $ 1,674,000,000 |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Amounts due to Dominion, noncurrent |  | 1,096,000,000 |  | 1,096,000,000 |  | 1,125,000,000 | [2]
Payable to affiliates |  | 633,000,000 |  | 633,000,000 |  | 500,000,000 | [2]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries |  | $ 0 |  | $ 0 |  | $ 0 |
Issuance of stock (in shares) |  | 0 | 0 | 0 | 0 |  |
Dividend paid | $ 600,000,000 |  |  |  |  |  |
Commencing Period |  |  |  |  |  | 20 months |
Lease commencement term |  |  |  |  |  | 2025-08 |
Related party transaction costs |  |  |  |  |  | $ 240,000,000 |
Cost of Revenue, Related Party [Extensible Enumeration] |  |  |  |  |  | Affiliated Entity |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Derivative assets |  | $ 11,000,000 |  | $ 11,000,000 |  | $ 1,000,000 |
Derivative liabilities |  | 43,000,000 |  | 43,000,000 |  | 79,000,000 |
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 |  | 493,000,000 |  | 493,000,000 |  | 456,000,000 |
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 |  | 640,000,000 |  | 640,000,000 |  | 584,000,000 |
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payable to affiliates |  | $ 633,000,000 |  | $ 633,000,000 |  | $ 500,000,000 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.

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