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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Public Utilities General Disclosures [Line Items] |  |  |  |
Operating revenue from contracts with customers | $ 3,758 | $ 4,236 | $ 10,290 | $ 10,967
Renewable Energy Investment Tax Credits |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |
Operating revenue from contracts with customers | 7 | 21 | 36 | 32
Alternative Revenue Programs |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |
Other revenues | 34 | 20 | 111 | 47
Virginia Electric and Power Company |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |
Operating revenue from contracts with customers | 2,598 | 2,959 | 7,133 | 7,394
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |
Operating revenue from contracts with customers | 2 | 13 | 24 | 13
Virginia Electric and Power Company | Alternative Revenue Programs |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |
Other revenues | $ 34 | $ 20 | $ 111 | $ 47

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