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Property, Plant and Equipment (Narrative) (Detail) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) MW | Jun. 30, 2022 USD ($)
Property Plant And Equipment [Line Items] |  |  |
Project Cost |  | $ 12 | $ 121
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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