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Regulatory Matters - Summary of Additional Significant Riders Associated with Various Virginia Power Projects (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019
Public Utilities, General Disclosures [Line Items] |  |
Increase (decrease) in revenue requirement | $ 11 |
Rider S | Virginia Electric and Power Company |  |
Public Utilities, General Disclosures [Line Items] |  |
Rate Year Beginning |  | 2020-04
Total Revenue Requirement (millions) |  | $ 195,000,000
Increase (decrease) in revenue requirement |  | $ (20,000,000)
Rider GV | Virginia Electric and Power Company |  |
Public Utilities, General Disclosures [Line Items] |  |
Application Date |  | 2019-05
Approval Date |  | February 2020
Rate Year Beginning |  | 2020-04
Total Revenue Requirement (millions) |  | $ 132,000,000
Increase (decrease) in revenue requirement |  | $ 12,000,000
Rider W | Virginia Electric and Power Company |  |
Public Utilities, General Disclosures [Line Items] |  |
Application Date |  | 2019-05
Approval Date |  | February 2020
Rate Year Beginning |  | 2020-04
Total Revenue Requirement (millions) |  | $ 106,000,000
Increase (decrease) in revenue requirement |  | $ 1,000,000
Rider R | Virginia Electric and Power Company |  |
Public Utilities, General Disclosures [Line Items] |  |
Application Date |  | 2019-05
Approval Date |  | February 2020
Rate Year Beginning |  | 2020-04
Total Revenue Requirement (millions) |  | $ 44,000,000
Increase (decrease) in revenue requirement |  | $ (13,000,000)
Rider B | Virginia Electric and Power Company |  |
Public Utilities, General Disclosures [Line Items] |  |
Application Date |  | 2019-05
Approval Date |  | February 2020
Rate Year Beginning |  | 2020-04
Total Revenue Requirement (millions) |  | $ 32,000,000
Increase (decrease) in revenue requirement |  | $ (6,000,000)
Rider US-3 | Virginia Electric and Power Company |  |
Public Utilities, General Disclosures [Line Items] |  |
Application Date |  | 2019-07
Approval Date |  | Pending
Rate Year Beginning |  | 2020-06
Total Revenue Requirement (millions) |  | $ 31,000,000
Increase (decrease) in revenue requirement |  | $ 21,000,000
Rider BW | Virginia Electric and Power Company |  |
Public Utilities, General Disclosures [Line Items] |  |
Application Date |  | 2019-10
Approval Date |  | Pending
Rate Year Beginning |  | 2020-09
Total Revenue Requirement (millions) |  | $ 120,000,000
Increase (decrease) in revenue requirement |  | $ 1,000,000
Rider US-2 | Virginia Electric and Power Company |  |
Public Utilities, General Disclosures [Line Items] |  |
Application Date |  | 2019-10
Approval Date |  | Pending
Rate Year Beginning |  | 2020-09
Total Revenue Requirement (millions) |  | $ 10,000,000
Increase (decrease) in revenue requirement |  | $ (5,000,000)
Rider E | Virginia Electric and Power Company |  |
Public Utilities, General Disclosures [Line Items] |  |
Application Date |  | 2020-01
Approval Date |  | Pending
Rate Year Beginning |  | 2020-11
Total Revenue Requirement (millions) |  | $ 88,000,000
Increase (decrease) in revenue requirement |  | $ (16,000,000)

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