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Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2020
Public Utilities General Disclosures [Line Items] |  |
Increase (Decrease) Over Previous Year | $ 14 |
Rider US-3 |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2019-07
Approval Date |  | March 2020
Rate Year Beginning |  | 2020-06
Total Revenue Requirement (millions) |  | $ 28
Increase (Decrease) Over Previous Year |  | $ 18
Rider BW |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2019-10
Approval Date |  | June 2020
Rate Year Beginning |  | 2020-09
Total Revenue Requirement (millions) |  | $ 99
Increase (Decrease) Over Previous Year |  | $ (20)
Rider US-2 |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2019-10
Approval Date |  | July 2020
Rate Year Beginning |  | 2020-09
Total Revenue Requirement (millions) |  | $ 10
Increase (Decrease) Over Previous Year |  | $ (5)
Rider E |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2020-01
Approval Date |  | September 2020
Rate Year Beginning |  | 2020-11
Total Revenue Requirement (millions) |  | $ 85
Increase (Decrease) Over Previous Year |  | $ (19)
Rider B |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2020-06
Approval Date |  | Pending
Rate Year Beginning |  | 2021-04
Total Revenue Requirement (millions) |  | $ 24
Increase (Decrease) Over Previous Year |  | $ (8)
Rider GV |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2020-06
Approval Date |  | Pending
Rate Year Beginning |  | 2021-04
Total Revenue Requirement (millions) |  | $ 154
Increase (Decrease) Over Previous Year |  | $ 22
Rider R |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2020-06
Approval Date |  | Pending
Rate Year Beginning |  | 2021-04
Total Revenue Requirement (millions) |  | $ 59
Increase (Decrease) Over Previous Year |  | $ 15
Rider S |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2020-06
Approval Date |  | Pending
Rate Year Beginning |  | 2021-04
Total Revenue Requirement (millions) |  | $ 194
Increase (Decrease) Over Previous Year |  | $ (1)
Rider W |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2020-06
Approval Date |  | Pending
Rate Year Beginning |  | 2021-04
Total Revenue Requirement (millions) |  | $ 120
Increase (Decrease) Over Previous Year |  | $ 14
Rider US-3 |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2020-07
Approval Date |  | Pending
Rate Year Beginning |  | 2021-06
Total Revenue Requirement (millions) |  | $ 39
Increase (Decrease) Over Previous Year |  | $ 10
Rider US-4 |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2020-07
Approval Date |  | Pending
Rate Year Beginning |  | 2021-06
Total Revenue Requirement (millions) |  | $ 12
Increase (Decrease) Over Previous Year |  | $ 4
Rider BW |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2020-10
Approval Date |  | Pending
Rate Year Beginning |  | 2021-09
Total Revenue Requirement (millions) |  | $ 113
Increase (Decrease) Over Previous Year |  | $ 14
Rider US-2 |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2020-10
Approval Date |  | Pending
Rate Year Beginning |  | 2021-09
Total Revenue Requirement (millions) |  | $ 10
Rider E |  |
Public Utilities General Disclosures [Line Items] |  |
Application Date |  | 2021-01
Approval Date |  | Pending
Rate Year Beginning |  | 2021-11
Total Revenue Requirement (millions) |  | $ 67
Increase (Decrease) Over Previous Year |  | $ (18)

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