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Operating Revenue (Schedule of Operating Revenue Recognition from Contracts with Customers) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating Revenue | [1] | $ 3,088 | $ 2,813 | $ 6,554 | $ 6,197
Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating Revenue | [2] | 1,829 | 1,747 | 3,577 | 3,578
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating Revenue | [3] | 459 | $ 422 | 985 | $ 912
Subsequent To Adoption of Revised Guidance |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 2,945 |  | 6,269 |
Nonregulated electric sales |  | 282 |  | 700 |
Nonregulated gas sales |  | 9 |  | 97 |
Nonregulated gas transportation and storage |  | 124 |  | 124 |
Other regulated revenues |  | 44 |  | 94 |
Other nonregulated revenues | [4],[5] | 141 |  | 277 |
Operating Revenue |  | 3,088 |  | 6,554 |
Subsequent To Adoption of Revised Guidance | FERC-regulated |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas transportation and storage |  | 272 |  | 534 |
Subsequent To Adoption of Revised Guidance | State-regulated |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas transportation and storage |  | 144 |  | 334 |
Subsequent To Adoption of Revised Guidance | Residential |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas sales |  | 116 |  | 480 |
Subsequent To Adoption of Revised Guidance | Commercial |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas sales |  | 34 |  | 137 |
Subsequent To Adoption of Revised Guidance | Other |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas sales |  | 1 |  | 11 |
Subsequent To Adoption of Revised Guidance | Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 1,829 |  | 3,577 |
Other regulated revenues |  | 33 |  | 65 |
Other nonregulated revenues | [5] | 18 |  | 31 |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 456 |  | 984 |
Nonregulated gas sales | [5] | 1 |  | 3 |
Other regulated revenues | [5] | 4 |  | 12 |
Other nonregulated revenues | [5] | 4 |  | 6 |
Operating Revenue |  | 459 |  | 985 |
Management service revenue | [5] | 60 |  | 107 |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC | FERC-regulated |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas transportation and storage | [5] | 183 |  | 382 |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC | State-regulated |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas transportation and storage | [5] | 139 |  | 319 |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC | Residential |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas sales |  | 13 |  | 42 |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC | Other |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas sales |  | 2 |  | 9 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Residential |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 788 |  | 1,605 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Commercial |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 636 |  | 1,160 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Industrial |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 121 |  | 228 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Government and Other Retail |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 210 |  | 423 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Wholesale |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 23 |  | 65 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Virginia Electric and Power Company | Residential |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 788 |  | 1,605 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Virginia Electric and Power Company | Commercial |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 636 |  | 1,160 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Virginia Electric and Power Company | Industrial |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 121 |  | 228 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Virginia Electric and Power Company | Government and Other Retail |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 210 |  | 423 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Virginia Electric and Power Company | Wholesale |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 23 |  | 65 |
Subsequent To Adoption of Revised Guidance | Other Revenues |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 143 |  | 285 |
Subsequent To Adoption of Revised Guidance | Other Revenues | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue | [5] | 3 |  | 1 |
Subsequent To Adoption of Revised Guidance | NGL Production | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue | [4],[5] | $ 50 |  | $ 104 |
[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.
[4] | Amounts above include $33 million and $21 million for the three months ended June 30, 2018, and $63 million and $47 million for the six months ended June 30, 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.
[5] | See Notes 10 and 18 for amounts attributable to related parties and affiliates.

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