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Operating Revenue (Schedule of Operating Revenue) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Electric sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated |  |  |  |  |  |  |  |  | $ 7,383 |  | $ 7,348 |  | $ 7,482 |
Nonregulated |  |  |  |  |  |  |  |  | 1,429 |  | 1,519 |  | 1,488 |
Gas sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated |  |  |  |  |  |  |  |  | 1,067 |  | 500 |  | 218 |
Nonregulated |  |  |  |  |  |  |  |  | 457 |  | 354 |  | 471 |
Gas transportation and storage |  |  |  |  |  |  |  |  | 1,786 |  | 1,636 |  | 1,616 |
Other |  |  |  |  |  |  |  |  | 464 |  | 380 |  | 408 |
Total operating revenue | $ 3,210 | $ 3,179 | $ 2,813 | $ 3,384 | $ 3,086 | $ 3,132 | $ 2,598 | $ 2,921 | 12,586 | [1] | 11,737 | [1] | 11,683 | [1]
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated |  |  |  |  |  |  |  |  | 7,383 |  | 7,348 |  | 7,482 |
Gas sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  | 173 |  | 240 |  | 140 |
Total operating revenue | 1,824 | 2,154 | 1,747 | 1,831 | 1,711 | 2,211 | 1,776 | 1,890 | 7,556 |  | 7,588 |  | 7,622 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated |  |  |  |  |  |  |  |  | 87 |  | 119 |  | 122 |
Nonregulated |  |  |  |  |  |  |  |  | 20 |  | 13 |  | 10 |
Gas transportation and storage |  |  |  |  |  |  |  |  | 1,435 |  | 1,307 |  | 1,366 |
NGL revenue |  |  |  |  |  |  |  |  | 91 |  | 62 |  | 93 |
Other |  |  |  |  |  |  |  |  | 181 |  | 137 |  | 125 |
Total operating revenue | $ 501 | $ 401 | $ 422 | $ 490 | $ 457 | $ 382 | $ 368 | $ 431 | $ 1,814 | [2] | $ 1,638 | [2] | $ 1,716 | [2]
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 24 for amounts attributable to related parties.

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- Definition Electric Domestic Unregulated Revenue + References No definition available. + Details
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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 Revenue from natural gas production during the reporting period. Natural gas consists largely of the hydrocarbon methane, and is found in underground formations either by itself or with crude oil. + 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 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 Reference 3: 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 + 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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