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Fair Value Measurements (Narrative) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  | $ 600,000,000 |  | $ 307,000,000 |  | $ 1,401,000,000 |
Net Income (Loss) From Discontinued Operations | $ (3,000,000) | $ (15,000,000) | $ 97,000,000 | $ 118,000,000 | $ (33,000,000) | $ (541,000,000) | $ 168,000,000 | $ 281,000,000 |  | 197,000,000 | [1] | (125,000,000) | [1] | 922,000,000 | [1]
Net Income (Loss) From Discontinued Operations, after tax |  |  |  |  |  |  |  |  |  | 197,000,000 |  | (125,000,000) |  | 922,000,000 | [2]
Unrealized gains or losses included in earnings in Level 3 fair value category |  |  |  |  |  |  |  |  |  | (5,000,000) |  | 7,000,000 |  | 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 | $ 23,000,000 |  |  |  | 35,000,000 |  |  |  |  | 23,000,000 |  | 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 |  |  |  |  |  |  |  |  |  | 17,000,000 |  | 93,000,000 |  |  |
Asset impairment charges after tax |  |  |  |  |  |  |  |  |  | 12,000,000 |  | 69,000,000 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains or losses included in earnings in Level 3 fair value category |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | $ 0 |
Virginia Electric and Power Company | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  | $ 191,000,000 | 25,000,000 |  |  |  |  |
Asset impairment charges after tax |  |  |  |  |  |  |  |  | $ 142,000,000 | $ 18,000,000 |  |  |  |  |
Nonregulated Solar Assets | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets, estimated fair value |  |  |  |  | $ 22,000,000 |  |  |  |  |  |  | 22,000,000 |  |  |
Nonregulated Solar Assets | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |
Asset impairment charges after tax |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000 |  |  |
[1] | Includes income tax expense of $31 million, $1.3 billion and $207 million for the years ended December 31, 2024, 2023 and 2022, respectively.
[2] | As discussed in Note 19, effective in June 2022 through its redemption in September 2022, the Series A Preferred Stock was considered to be mandatorily redeemable and was classified in current liabilities.

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