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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | $ 4,081 | $ 3,362 | $ 11,457 | $ 9,631
Other revenues | [1] | 188 | 89 | 640 | 374
NGL Midstream |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 36 | 108 | 129 | 170
Alternative Revenue |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Other revenues |  | 9 |  | 44 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 501 | 532 | 1,595 | 1,428
Other revenues |  | 1 | 1 | 3 | 3
Dominion Energy Gas Holdings, LLC | NGL Midstream |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 1 | 3 | 4 | 8
Dominion Energy Gas Holdings, LLC | Renewable Energy Investment Tax Credits |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 12 |  | 19 |
Dominion Energy and Virginia Electric and Power | Renewable Energy Investment Tax Credits |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  |  | 10 |  | 11
Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 2,250 | 2,210 | 6,116 | 5,787
Other revenues | [1],[2] | 14 | $ 22 | 51 | $ 22
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 11 |  | 14 |
Virginia Electric and Power Company | Alternative Revenue |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Other revenues |  | $ 9 |  | $ 35 |
[1] | Amounts above include alternative revenue of $9 million and $44 million at Dominion Energy and $9 million and $35 million at Virginia Power for the three and nine months ended September 30, 2019, respectively.
[2] | See Notes 10 and 20 for amounts attributable to related parties and affiliates.

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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