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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Total operating revenue | [1] | $ 3,088 | $ 2,813 | $ 6,554 | $ 6,197
Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Total operating revenue | [2] | 1,829 | 1,747 | 3,577 | 3,578
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Total operating revenue | [3] | $ 459 | 422 | $ 985 | 912
Prior to adoption of revised guidance |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Nonregulated |  |  | 307 |  | 734
Regulated |  |  | 151 |  | 599
Nonregulated |  |  | 110 |  | 254
Total operating revenue |  |  | 2,813 |  | 6,197
Prior to adoption of revised guidance | Regulated Electric Sales |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 1,716 |  | 3,482
Prior to adoption of revised guidance | Gas Transportation and Storage |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 430 |  | 922
Prior to adoption of revised guidance | Other |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 99 |  | 206
Prior to adoption of revised guidance | Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Total operating revenue |  |  | 1,747 |  | 3,578
Prior to adoption of revised guidance | Virginia Electric and Power Company | Regulated Electric Sales |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 1,716 |  | 3,482
Prior to adoption of revised guidance | Virginia Electric and Power Company | Other |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 31 |  | 96
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated |  |  | 15 |  | 47
Nonregulated |  |  | 8 |  | 10
Total operating revenue |  |  | 422 |  | 912
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC | Gas Transportation and Storage |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | 342 |  | 738
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC | Other |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Revenue |  |  | $ 57 |  | $ 117
[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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