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Fair Value Measurements (Narrative) (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Net Income (Loss) From Discontinued Operations | [1] | $ (554,000,000) |  |  | $ 152,000,000 | $ (105,000,000) | $ 775,000,000
Net Income (Loss) From Discontinued Operations, after tax |  | (554,000,000) |  |  | 152,000,000 | (105,000,000) | 775,000,000
Unrealized gains or losses included in operating revenue in Level 3 fair value category |  | (10,000,000) |  |  | 0 | (8,000,000) | 0
Level 3 | Corporate Office Building |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Long-lived assets, estimated fair value |  |  |  | $ 35,000,000 |  |  |
Impairment of Assets and Other Charges | Corporate Office Building |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | 91,000,000 |  |  |
Asset impairment charges after tax |  |  |  | $ 68,000,000 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Unrealized gains or losses included in operating revenue in Level 3 fair value category |  | $ 0 |  |  | $ 0 | $ 0 | $ 0
Nonregulated Solar Assets |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Net Income (Loss) From Discontinued Operations |  |  | $ 15,000,000 |  |  |  |
Net Income (Loss) From Discontinued Operations, after tax |  |  | 11,000,000 |  |  |  |
Nonregulated Solar Assets | Level 3 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Long-lived assets, estimated fair value |  |  | $ 22,000,000 |  |  |  |
[1] | Includes income tax expense of $1.2 billion and $53 million for the three months ended September 30, 2023 and 2022, respectively, and $1.3 billion and $185 million for the nine months ended September 30, 2023 and 2022, respectively.

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