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Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Parenthetical) (Detail) - Virginia Electric and Power Company $ in Millions | 1 Months Ended | 9 Months Ended
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Jun. 30, 2022 USD ($) | May 31, 2022 USD ($) | Dec. 31, 2021 USD ($) program | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2022 USD ($)
Rider SNA |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  | $ 107
Rider T1 |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  | 706
Rider U |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |
Total revenue requirement |  |  |  |  |  | $ 95
Virginia Regulation | Previous Phase |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |
Projected capital investment | $ 74 |  |  |  | $ 60 |
Virginia Regulation | Rider SNA | Operating Segments | Transmission Component Of Virginia Powers |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |
Projected capital investment |  |  |  | $ 1,200 |  |
Virginia Regulation | Rider T1 | Operating Segments |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |
Total revenue requirement |  | $ 224 |  |  |  |
Virginia Regulation | Rider T1 | Operating Segments | Transmission Component Of Virginia Powers |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |
Total revenue requirement |  | $ 482 |  |  |  |
Virginia Regulation | Rider U | Previous Phase |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |
Projected capital investment |  |  |  |  | $ 35 |
Virginia Regulation | Rider DSM |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |
Amount of cost cap recovery |  |  | $ 140 |  |  |
Public utilities energy efficiency program cost exceed percentage |  |  | 15.00% |  |  |
Virginia Regulation | Rider DSM | Operating Segments | Energy Efficiency Program |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |
Number of new energy efficiency programs | program |  |  | 9 |  |  |

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