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Related-Party Transactions (Narrative) (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Borrowing Interest Charges | $ 4,000,000 |  | $ 17,000,000 | $ 40,000,000 | $ 23,000,000 |  |
Dividend paid | 570,000,000 |  | $ 559,000,000 | 1,708,000,000 | $ 1,678,000,000 |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Affiliated current borrowings | 0 |  |  | 0 |  | $ 500,000,000 | [1]
Affiliated lease payables | 221,000,000 |  |  | 221,000,000 |  |  |
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries | 0 |  |  | $ 0 |  | 0 |
Dividend declared |  |  |  |  |  | 407,000,000 |
Lease agreement maturity period |  |  |  | 20 months |  |  |
Dividend paid |  | $ 407,000,000 |  |  |  |  |
Virginia Electric and Power Company | Other Current Liabilities |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Affiliated lease payables | 138,000,000 |  |  | $ 138,000,000 |  |  |
Virginia Electric and Power Company | Other Deferred Credits and Other Liabilities |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Affiliated lease payables | 83,000,000 |  |  | 83,000,000 |  |  |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Derivative assets | 24,000,000 |  |  | 24,000,000 |  | 19,000,000 |
Derivative liabilities | 15,000,000 |  |  | 15,000,000 |  | 17,000,000 |
Virginia Electric and Power Company | Affiliated Entity | Pension Benefits | Amounts Associated With Dominion Pension Plan |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other deferred credits and other liabilities | 572,000,000 |  |  | 572,000,000 |  | 505,000,000 |
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 | 707,000,000 |  |  | 707,000,000 |  | 663,000,000 |
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Affiliated current borrowings |  |  |  |  |  | $ 500,000,000 |
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements | Maximum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Affiliated current borrowings | $ 1,000,000 |  |  | $ 1,000,000 |  |  |
[1] | Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.

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