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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | $ 3,746 | $ 2,945 | $ 7,376 | $ 6,269
Other revenues | [1] | 224 | 143 | 452 | 285
NGL Midstream |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 42 | 33 | 93 | 63
Renewable Energy Investment Tax Credits |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Other revenues |  | 21 |  | 35 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 529 | 507 | 1,094 | 896
Other revenues |  | 1 | 1 | 2 | 2
Dominion Energy Gas Holdings, LLC | NGL Midstream |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 2 | 3 | 3 | 6
Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue from contracts with customers |  | 1,914 | $ 1,829 | 3,866 | $ 3,577
Other revenues | [1],[2] | 24 |  | 37 |
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Other revenues |  | $ 18 |  | $ 26 |
[1] | Amounts above include alternative revenue of $21 million and $35 million at Dominion Energy and $18 million and $26 million at Virginia Power for the three and six months ended June 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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