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Operating Revenue (Operating Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Electric sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated |  |  |  |  |  |  |  |  | $ 7,348 |  | $ 7,482 |  | $ 7,460 |
Nonregulated |  |  |  |  |  |  |  |  | 1,519 |  | 1,488 |  | 1,839 |
Gas sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated |  |  |  |  |  |  |  |  | 500 |  | 218 |  | 334 |
Nonregulated |  |  |  |  |  |  |  |  | 354 |  | 471 |  | 751 |
Gas transportation and storage |  |  |  |  |  |  |  |  | 1,636 |  | 1,616 |  | 1,543 |
Other |  |  |  |  |  |  |  |  | 380 |  | 408 |  | 509 |
Total operating revenue | $ 3,086 | $ 3,132 | $ 2,598 | $ 2,921 | $ 2,556 | $ 2,971 | $ 2,747 | $ 3,409 | 11,737 |  | 11,683 |  | 12,436 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated |  |  |  |  |  |  |  |  | 7,348 |  | 7,482 |  | 7,460 |
Gas sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  | 240 |  | 140 |  | 119 |
Total operating revenue | 1,711 | 2,211 | 1,776 | 1,890 | 1,614 | 2,058 | 1,813 | 2,137 | 7,588 | [1] | 7,622 | [1] | 7,579 | [1]
Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated |  |  |  |  |  |  |  |  | 119 |  | 122 |  | 209 |
Nonregulated |  |  |  |  |  |  |  |  | 13 |  | 10 |  | 26 |
Gas transportation and storage |  |  |  |  |  |  |  |  | 1,307 |  | 1,366 |  | 1,353 |
NGL revenue |  |  |  |  |  |  |  |  | 62 |  | 93 |  | 212 |
Other |  |  |  |  |  |  |  |  | 137 |  | 125 |  | 98 |
Total operating revenue | $ 457 | $ 382 | $ 368 | $ 431 | $ 425 | $ 365 | $ 395 | $ 531 | $ 1,638 | [2] | $ 1,716 | [2] | $ 1,898 | [2]
[1] | See Note 24 for amounts attributable to affiliates.
[2] | See Note 24 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=26872669&loc=d3e20235-122688 + Details
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- Definition Revenue derived from the unregulated 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=26872669&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=26872669&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=51678428&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=51678428&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=26872669&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=51678428&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=51678428&loc=d3e62246-109447 + Details
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- Definition Revenues from the sale of other goods or rendering of other services, not elsewhere specified in the taxonomy; net of (reduced by) sales adjustments, returns, allowances, and 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(a),(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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