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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | $ 3,470 | $ 3,746 | $ 7,793 | $ 7,376
Other revenues | [1] | 115 | 224 | 288 | 452
NGL Midstream | Transferred at a Point in Time |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 19 | 42 | 58 | 93
Renewable Energy Investment Tax Credits |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 7 | 4 | 11 | 7
Alternative Revenue Programs |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Other revenues |  | 39 | 21 | 75 | 35
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 509 | 529 | 1,064 | 1,094
Other revenues | [2] | 1 | 1 | 2 | 2
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 |  | 0 | 2 | 1 | 3
Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 1,765 | 1,914 | 3,674 | 3,866
Other revenues | [1],[2] | 40 | 24 | 61 | 37
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 5 | 2 | 8 | 3
Virginia Electric and Power Company | Alternative Revenue Programs |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Other revenues |  | $ 34 | $ 18 | $ 51 | $ 26
[1] | Amounts above include alternative revenue of $39 million and $21 million at Dominion Energy and $34 million and $18 million at Virginia Power for the three months ended June 30, 2020 and 2019, respectively, and $75 million and $35 million at Dominion Energy and $51 million and $26 million at Virginia Power for the six months ended June 30, 2020 and 2019, respectively.
[2] | See Notes 10 and 19 for amounts attributable to related parties and affiliates.

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