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Operating Revenue (Schedule of Operating Revenue Recognition from Contracts with Customers) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,348 |
Operating revenue |  | $ 3,361 | $ 3,451 | $ 3,088 | $ 3,466 | $ 3,210 | $ 3,179 | $ 2,813 | $ 3,384 | $ 13,366 | [1] | $ 12,586 | [1] | 11,737 | [1]
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | 1,810 | 2,232 | 1,829 | 1,748 | 1,824 | 2,154 | 1,747 | 1,831 | 7,619 | [2] | 7,556 | [2] | 7,588 | [2]
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ 566 | $ 533 | $ 508 | $ 389 | $ 405 | $ 351 | $ 363 | $ 404 | 1,996 | [3] | $ 1,523 | [3] | $ 1,374 | [3]
Subsequent To Adoption of Revised Guidance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 12,895 |  |  |  |  |
Nonregulated electric sales |  |  |  |  |  |  |  |  |  | 1,294 |  |  |  |  |
Nonregulated gas sales |  |  |  |  |  |  |  |  |  | 214 |  |  |  |  |
Nonregulated gas transportation and storage |  |  |  |  |  |  |  |  |  | 442 |  |  |  |  |
Other regulated revenues |  |  |  |  |  |  |  |  |  | 179 |  |  |  |  |
Other nonregulated revenues |  |  |  |  |  |  |  |  |  | 563 |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 13,366 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | FERC-regulated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated gas transportation and storage |  |  |  |  |  |  |  |  |  | 1,091 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | State-regulated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated gas transportation and storage |  |  |  |  |  |  |  |  |  | 640 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Residential |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated gas sales |  |  |  |  |  |  |  |  |  | 818 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Commercial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated gas sales |  |  |  |  |  |  |  |  |  | 221 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated gas sales |  |  |  |  |  |  |  |  |  | 36 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Residential |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 3,413 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Commercial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,503 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 490 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Government and Other Retail |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 854 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Wholesale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 137 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue | [4],[5] |  |  |  |  |  |  |  |  | 471 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 7,584 |  |  |  |  |
Other regulated revenues |  |  |  |  |  |  |  |  |  | 132 |  |  |  |  |
Other nonregulated revenues |  |  |  |  |  |  |  |  |  | 55 |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 7,619 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Virginia Electric and Power Company | Regulated Electric Sales | Residential |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 3,413 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Virginia Electric and Power Company | Regulated Electric Sales | Commercial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,503 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Virginia Electric and Power Company | Regulated Electric Sales | Industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 490 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Virginia Electric and Power Company | Regulated Electric Sales | Government and Other Retail |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 854 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Virginia Electric and Power Company | Regulated Electric Sales | Wholesale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 137 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Virginia Electric and Power Company | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue | [4],[6] |  |  |  |  |  |  |  |  | 35 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,002 |  |  |  |  |
Nonregulated gas sales | [6] |  |  |  |  |  |  |  |  | 7 |  |  |  |  |
Nonregulated gas transportation and storage |  |  |  |  |  |  |  |  |  | 442 |  |  |  |  |
Other regulated revenues | [5] |  |  |  |  |  |  |  |  | 19 |  |  |  |  |
Other nonregulated revenues | [5],[6] |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 1,996 |  |  |  |  |
Management service revenue | [6] |  |  |  |  |  |  |  |  | 257 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC | FERC-regulated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated gas transportation and storage |  |  |  |  |  |  |  |  |  | 1,249 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC | Wholesale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated gas sales |  |  |  |  |  |  |  |  |  | 25 |  |  |  |  |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | $ (6) |  |  |  |  |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 24 for amounts attributable to affiliates.
[3] | See Note 24 for amounts attributable to related parties.
[4] | Amounts above include $15 million of alternative revenue at Dominion Energy and Virginia Power for the year ended December 31, 2018.
[5] | Amounts above include $241 million and $10 million for the year ended December 31, 2018 primarily consisting of NGL sales at Dominion Energy and Dominion Energy Gas, respectively, which are considered to be goods transferred at a point in time. In addition, the amounts include $17 million and $11 million of sales of renewable energy credits at both Dominion Energy and Virginia Power for the year ended December 31, 2018, respectively, which are considered to be goods transferred at a point in time.
[6] | See Notes 9 and 24 for amounts attributable to related parties and affiliates.

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