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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Public Utilities General Disclosures [Line Items] |  |  |  |
Operating revenue from contracts with customers | $ 3,718 | $ 3,455 | $ 7,803 | $ 6,979
Renewable Energy Investment Tax Credits |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |
Operating revenue from contracts with customers | 5 | 7 | 15 | 12
Transition services agreements |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |
Other revenues | 24 | 13 | 51 | 17
Alternative Revenue Programs |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |
Other revenues | 60 | 33 | 82 | 61
Virginia Electric and Power Company |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |
Operating revenue from contracts with customers | 2,660 | 2,468 | 5,411 | 4,885
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |
Operating revenue from contracts with customers | 2 | 3 | 6 | 5
Virginia Electric and Power Company | Alternative Revenue Programs |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |
Other revenues | $ 60 | $ 33 | $ 82 | $ 61

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