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Operating Revenue (Schedule of Operating Revenue Prior to Revised Guidance of Revenue Recognition From Contracts with Customers) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,348 |
Total 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | $ 566 | $ 533 | $ 508 | $ 389 | $ 405 | $ 351 | $ 363 | $ 404 | $ 1,996 | [3] | 1,523 | [3] | 1,374 | [3]
Prior to adoption of revised guidance |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonregulated electric sales |  |  |  |  |  |  |  |  |  |  | 1,429 |  | 1,519 |
Regulated gas sales |  |  |  |  |  |  |  |  |  |  | 1,067 |  | 500 |
Nonregulated gas sales |  |  |  |  |  |  |  |  |  |  | 457 |  | 354 |
Total operating revenue |  |  |  |  |  |  |  |  |  |  | 12,586 |  | 11,737 |
Prior to adoption of revised guidance | Regulated Electric Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 7,383 |  |  |
Prior to adoption of revised guidance | Gas Transportation and Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 1,786 |  | 1,636 |
Prior to adoption of revised guidance | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 464 |  | 380 |
Prior to adoption of revised guidance | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  |  |  |  |  |  |  |  |  | 7,556 |  | 7,588 |
Prior to adoption of revised guidance | Virginia Electric and Power Company | Regulated Electric Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 7,383 |  | 7,348 |
Prior to adoption of revised guidance | Virginia Electric and Power Company | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 173 |  | 240 |
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated gas sales |  |  |  |  |  |  |  |  |  |  | 6 |  | 44 |
Nonregulated gas sales |  |  |  |  |  |  |  |  |  |  | 6 |  | 4 |
Total operating revenue |  |  |  |  |  |  |  |  |  |  | 1,523 |  | 1,374 |
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC | Gas Transportation and Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 1,291 |  | 1,153 |
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | $ 220 |  | $ 173 |
[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.

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