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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Public Utilities General Disclosures [Line Items] |  |
Operating revenue from contracts with customers | $ 3,631 | $ 3,324
Other revenues | 227 | 142
NGL Midstream |  |
Public Utilities General Disclosures [Line Items] |  |
Operating revenue from contracts with customers | 51 | $ 30
Renewable Energy Investment Tax Credits |  |
Public Utilities General Disclosures [Line Items] |  |
Other revenues | 14 |
Virginia Electric and Power Company |  |
Public Utilities General Disclosures [Line Items] |  |
Other revenues | $ 8 |

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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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