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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | $ 4,655 | $ 3,434 | $ 12,996 | $ 10,358
Other revenues | [1],[2] | (269) | (258) | (735) | (274)
GT&S Transaction |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue associated with discontinued operations |  |  | 1 |  | 3
NGL Midstream | Transferred at a Point in Time |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 10 | 9 | 35 | 24
Renewable Energy Investment Tax Credits |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 21 | 16 | 32 | 29
Alternative Revenue Programs |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Other revenues |  | 20 | 3 | 90 | 50
Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 2,959 | 1,987 | 7,394 | 5,517
Other revenues | [1],[3] | (84) | (11) | (177) | 30
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 13 | 13 | 13 | 22
Virginia Electric and Power Company | Alternative Revenue Programs |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Other revenues |  | $ 20 | $ 3 | $ 47 | $ 41
[1] | Includes alternative revenue of $20 million and $3 million at Dominion Energy and $20 million and $3 million at Virginia Power for the three months ended September 30, 2022 and 2021, respectively, and $90 million and $50 million at Dominion Energy and $47 million and $41 million at Virginia Power for the nine months ended September 30, 2022 and 2021, respectively.
[2] | Includes revenue associated with services provided to discontinued operations of $1 million and $3 million for the three and nine months ended September 30, 2021, respectively.
[3] | See Note 19 for amounts attributable to affiliates.

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