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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Public Utilities General Disclosures [Line Items] |  |  |
Other revenues | [1] | $ 173 | $ 227
NGL Midstream | Transferred at a Point in Time |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers |  | 39 | 48
Renewable Energy Investment Tax Credits |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers |  | 4 | 3
Alternative Revenue Programs |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Other revenues |  | 36 | 14
Dominion Energy Gas Holdings, LLC |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Other revenues |  | 1 | 1
Dominion Energy Gas Holdings, LLC | NGL Midstream | Transferred at a Point in Time |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers |  | 1 | 1
Virginia Electric and Power Company |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Other revenues | [1],[2] | 21 | 14
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Operating revenue from contracts with customers |  | 3 | 1
Virginia Electric and Power Company | Alternative Revenue Programs |  |  |
Public Utilities General Disclosures [Line Items] |  |  |
Other revenues |  | $ 17 | $ 8
[1] | Includes alternative revenue. For the three months ended March 31, 2020 and 2019, such amounts included $36 million and $14 million, respectively, at Dominion Energy and $17 million and $8 million, respectively, at Virginia Power.
[2] | See Notes 10 and 19 for amounts attributable to related parties and affiliates.

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