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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | $ 3,536 | $ 3,623 | $ 10,350 | $ 9,993
Other revenues | [1],[2] | 71 | 159 | 301 | 513
Gas, Transmission & Storage |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue associated with discontinued operations |  | 1 |  | 4 |
NGL Midstream | Transferred at a Point in Time |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 5 | 12 | 16 | 29
Renewable Energy Investment Tax Credits |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 21 | 12 | 32 | 19
Alternative Revenue Programs |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Other revenues |  | 51 | 9 | 90 | 44
Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 2,231 | 2,250 | 5,905 | 6,116
Other revenues | [2],[3] | 17 | 14 | 78 | 51
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 16 | 11 | 24 | 14
Virginia Electric and Power Company | Alternative Revenue Programs |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Other revenues |  | $ 12 | $ 9 | $ 63 | $ 35
[1] | Amounts above include revenue associated with services provided to discontinued operations of $1 million and $4 million for both the three and nine months ended September 30, 2020 and 2019, respectively.
[2] | Amounts above include alternative revenue of $51 million and $9 million at Dominion Energy and $12 million and $9 million at Virginia Power for the three months ended September 30, 2020 and 2019, respectively, and $90 million and $44million at Dominion Energy and $63 million and $35 million at Virginia Power for the nine months ended September 30, 2020 and 2019, respectively.
[3] | See Notes 10 and 19 for amounts attributable to related parties and affiliates.

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