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Related-Party Transactions (Narrative) (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Related Party Transaction [Line Items] |  |  |  |
Derivative assets | $ 1,209,000,000 |  | $ 613,000,000 |
Derivative liabilities | 1,314,000,000 |  | 868,000,000 |
Virginia Electric and Power Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Derivative assets | 404,000,000 |  | 300,000,000 |
Derivative liabilities | 508,000,000 |  | 470,000,000 |
Payable to affiliates | 235,000,000 |  | 699,000,000 | [1]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries | $ 0 |  | 0 |
Issuance of common stock to Dominion | 0 | 0 |  |
Virginia Electric and Power Company | Pension Benefits | Amounts Associated With Dominion Pension Plan |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amounts due to Dominion, noncurrent | $ 540,000,000 |  | 522,000,000 |
Payment to be paid to Dominion, in 2022 | 175,000,000 |  |  |
Virginia Electric and Power Company | 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 | 453,000,000 |  | 431,000,000 |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Derivative assets | 64,000,000 |  | 29,000,000 |
Derivative liabilities | 1,000,000 |  | 6,000,000 |
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Payable to affiliates | $ 235,000,000 |  | $ 699,000,000 |
[1] | Virginia Power’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.

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