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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers | $ 13,487 | $ 14,552 | $ 11,661
Renewable Energy Investment Tax Credits |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers | 44 | 42 | 33
Alternative Revenue Programs |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Other revenues | 162 | 72 | 44
Virginia Electric and Power Company |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers | 9,372 | 9,868 | 7,470
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers | 29 | 18 | 21
Virginia Electric and Power Company | Alternative Revenue Programs |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Other revenues | $ 162 | $ 72 | $ 44

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