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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Public Utilities General Disclosures [Line Items] |  |
Operating revenue from contracts with customers | $ 4,756 | $ 4,547
NGL Midstream | Transferred at a Point in Time |  |
Public Utilities General Disclosures [Line Items] |  |
Operating revenue from contracts with customers | 8 | 11
Renewable Energy Investment Tax Credits |  |
Public Utilities General Disclosures [Line Items] |  |
Operating revenue from contracts with customers | 5 | 4
Alternative Revenue Programs |  |
Public Utilities General Disclosures [Line Items] |  |
Other revenues | 57 | 30
Virginia Electric and Power Company |  |
Public Utilities General Disclosures [Line Items] |  |
Operating revenue from contracts with customers | 2,346 | 2,196
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |
Public Utilities General Disclosures [Line Items] |  |
Operating revenue from contracts with customers | 3 |
Virginia Electric and Power Company | Alternative Revenue Programs |  |
Public Utilities General Disclosures [Line Items] |  |
Other revenues | $ 27 | 8
Virginia Electric and Power Company | Maximum | Renewable Energy Investment Tax Credits |  |
Public Utilities General Disclosures [Line Items] |  |
Operating revenue from contracts with customers |  | $ 1

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