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Property, Plant and Equipment (Narrative) (Detail) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 08, 2023 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) MW | Sep. 30, 2022 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Project Cost |  |  |  | $ 14 | $ 139
Virginia Electric and Power Company |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Project Cost |  |  |  | $ 14 | 51
Forecast | Virginia Electric and Power Company | Virginia Power Easement Agreement |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Easement charges after tax |  |  | $ 49 |  |
Easement charges before tax |  |  | $ 65 |  |
Subsequent Event | Virginia Electric and Power Company | Virginia Power Easement Agreement |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Project easement cost paid | $ 65 |  |  |  |
Acquisition of Solar Project Foxhound Virginia |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Date Agreement Entered |  |  |  | 2023-03 |
Date Agreement Closed |  |  |  | Excepted 2024 |
Project Cost |  |  |  | $ 205 |
Date of Commercial Operations |  |  |  | Excepted 2024 |
MW Capacity | MW |  |  |  | 83 |
Utility Property |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Sale of utility property |  | $ 16 |  |  |
Gain on sale of asset |  |  |  |  | 16
Gain on sale of asset after tax |  |  |  |  | $ 12

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