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Operating Revenue (Schedule of Operating Revenue For Revised Guidance of Revenue Recognition From Contracts with Customers ) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Gas sales: |  |  |
Total operating revenue | [1] | $ 3,466 | $ 3,384
Virginia Electric and Power Company |  |  |
Gas sales: |  |  |
Total operating revenue | [2] | 1,748 | 1,831
Dominion Energy Gas Holdings, LLC |  |  |
Gas sales: |  |  |
Total operating revenue | [3] | $ 526 | 490
Prior to adoption of revised guidance |  |  |
Electric sales: |  |  |
Regulated |  |  | 1,766
Nonregulated |  |  | 427
Gas sales: |  |  |
Regulated |  |  | 448
Nonregulated |  |  | 144
Gas transportation and storage |  |  | 492
Other revenues |  |  | 107
Total operating revenue |  |  | 3,384
Prior to adoption of revised guidance | Virginia Electric and Power Company |  |  |
Electric sales: |  |  |
Regulated |  |  | 1,766
Gas sales: |  |  |
Other revenues |  |  | 65
Total operating revenue |  |  | 1,831
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC |  |  |
Gas sales: |  |  |
Regulated |  |  | 32
Nonregulated |  |  | 2
Gas transportation and storage |  |  | 396
Other revenues |  |  | 60
Total operating revenue |  |  | $ 490
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 18 for amounts attributable to affiliates.
[3] | See Note 18 for amounts attributable to related parties.

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- Definition Revenue derived from the regulated (by a federal, state, or local government or agency) generation, transmission and distribution of electricity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Revenue related to midstream and downstream gas activities. May include the following: gathering from wells, processing to remove impurities, storage, transmission, and the sale of natural gas and related products. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62246-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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- Definition Amount, after sales adjustments, returns, allowances, and discounts, of revenue classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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