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Property, Plant and Equipment (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Property, Plant and Equipment [Line Items] |  |
Impairment of assets and other charges | $ 30 | $ 98
Level 3 | Corporate Office Building |  |
Property, Plant and Equipment [Line Items] |  |
Long-lived assets, estimated fair value |  | 35
Impairment of Assets and Other Charges | Corporate Office Building |  |
Property, Plant and Equipment [Line Items] |  |
Impairment of assets and other charges |  | 91
Asset impairment charges after tax |  | $ 68
Acquisition of Solar Project Foxhound Virginia |  |
Property, Plant and Equipment [Line Items] |  |
Date Agreement Entered | 2023-03 |
Date Agreement Closed | February 2024 |
Date of Commercial Operations | April 2024 |

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