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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | $ 4,475 | $ 4,269 | $ 3,970 | $ 3,858 | $ 3,361 | $ 3,451 | $ 3,088 | $ 3,466 | $ 16,572 | [1] | $ 13,366 | [1] | $ 12,586 | [1]
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | 1,941 | 2,264 | 1,938 | 1,965 | 1,810 | 2,232 | 1,829 | 1,748 | 8,108 | [2] | 7,619 | [2] | 7,556 | [2]
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | $ 571 | $ 502 | $ 530 | $ 566 | $ 566 | $ 533 | $ 508 | $ 389 | $ 2,169 | [3] | $ 1,996 | [3] | 1,523 | [3]
Prior to adoption of revised guidance |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonregulated electric sales |  |  |  |  |  |  |  |  |  |  |  |  | 1,429 |
Regulated gas sales |  |  |  |  |  |  |  |  |  |  |  |  | 1,067 |
Nonregulated gas sales |  |  |  |  |  |  |  |  |  |  |  |  | 457 |
Total operating revenue |  |  |  |  |  |  |  |  |  |  |  |  | 12,586 |
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 |
Prior to adoption of revised guidance | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 464 |
Prior to adoption of revised guidance | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  |  |  |  |  |  |  |  |  |  |  | 7,556 |
Prior to adoption of revised guidance | Virginia Electric and Power Company | Regulated Electric Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 7,383 |
Prior to adoption of revised guidance | Virginia Electric and Power Company | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 173 |
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated gas sales |  |  |  |  |  |  |  |  |  |  |  |  | 6 |
Nonregulated gas sales |  |  |  |  |  |  |  |  |  |  |  |  | 6 |
Total operating revenue |  |  |  |  |  |  |  |  |  |  |  |  | 1,523 |
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC | Gas Transportation and Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 1,291 |
Prior to adoption of revised guidance | Dominion Energy Gas Holdings, LLC | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 220 |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 25 for amounts attributable to affiliates.
[3] | See Note 25 for amounts attributable to related parties.

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