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Operating Revenue (Schedule of Operating Revenue Recognition from Contracts with Customers) (Parenthetical) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Public Utilities General Disclosures [Line Items] |
Alternative revenue | $ 15
NGL Midstream |
Public Utilities General Disclosures [Line Items] |
Sales revenue | 241
Renewable Energy Investment Tax Credits |
Public Utilities General Disclosures [Line Items] |
Sales revenue | 17
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits |
Public Utilities General Disclosures [Line Items] |
Sales revenue | 11
Dominion Energy Gas Holdings, LLC | NGL Midstream |
Public Utilities General Disclosures [Line Items] |
Sales revenue | $ 10

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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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