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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers |  | $ 4,547 | $ 3,840
Other revenues | [1],[2] | (268) | 30
GT&S Transaction |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Revenue associated with discontinued operations |  |  | 1
NGL Midstream | Transferred at a Point in Time |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers |  | 11 | 7
Renewable Energy Investment Tax Credits |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers |  | 4 | 6
Alternative Revenue Programs |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Other revenues |  | 30 | 22
Virginia Electric and Power Company |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers |  | 2,196 | 1,807
Other revenues | [1],[3] | (29) | 23
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers |  |  | 4
Virginia Electric and Power Company | Alternative Revenue Programs |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Other revenues |  | 8 | $ 20
Virginia Electric and Power Company | Maximum | Renewable Energy Investment Tax Credits |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers |  | $ 1 |
[1] | Includes alternative revenue of $30 million and $22 million at Dominion Energy and $8 million and $20 million at Virginia Power for the three months ended March 31, 2022 and 2021, respectively.
[2] | Includes revenue associated with services provided to discontinued operations of $1 million for the three months ended March 31, 2021.
[3] | See Note 19 for amounts attributable to affiliates.

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