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Related-Party Transactions (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Derivative Asset |  | $ 252,000,000 |  | $ 252,000,000 |  | $ 93,000,000 |
Derivative Liabilities |  | 776,000,000 |  | 776,000,000 |  | 740,000,000 |
Virginia Electric and Power Company |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Derivative Asset |  | 145,000,000 |  | 145,000,000 |  | 24,000,000 |
Derivative Liabilities |  | 491,000,000 |  | 491,000,000 |  | 466,000,000 |
Payable to affiliates |  | 230,000,000 |  | 230,000,000 |  | 107,000,000 | [1]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries |  | $ 0 |  | $ 0 |  | 0 |
Issuance of common stock to Dominion |  | 0 | 0 | 0 | 0 |  |
Virginia Electric and Power Company | Pension Benefits | Amounts Associated With Dominion Pension Plan |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payment made to Dominion | $ 313,000,000 |  |  |  |  |  |
Amounts due to Dominion, noncurrent |  | $ 556,000,000 |  | $ 556,000,000 |  | 782,000,000 |
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 |  | 334,000,000 |  | 334,000,000 |  | 287,000,000 |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Derivative Asset |  | 11,000,000 |  | 11,000,000 |  | 3,000,000 |
Derivative Liabilities |  | 7,000,000 |  | 7,000,000 |  | 53,000,000 |
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payable to affiliates |  | $ 230,000,000 |  | $ 230,000,000 |  | $ 107,000,000 |
[1] | Virginia Power’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.

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