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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers | $ 14,559 | $ 11,662 | $ 11,551
Renewable Energy Investment Tax Credits |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers | 42 | 33 | 20
Alternative Revenue Programs |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Other revenues | 72 | 44 | 84
Virginia Electric and Power Company |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers | 9,868 | 7,470 | 7,661
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers | 18 | 21 | 11
Virginia Electric and Power Company | Alternative Revenue Programs |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Other revenues | $ 72 | $ 44 | $ 84

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