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Fair Value Measurements (Narrative) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  | $ 307,000,000 |  | $ 1,401,000,000 |  | $ 194,000,000 |
Net Income (Loss) From Discontinued Operations | $ (71,000,000) | $ (541,000,000) | $ 168,000,000 | $ 281,000,000 | $ 122,000,000 | $ 150,000,000 | $ 212,000,000 | $ 410,000,000 | (163,000,000) | [1],[2] | 894,000,000 | [1],[2] | 1,358,000,000 | [1],[2]
Net Income (Loss) From Discontinued Operations, after tax |  |  |  |  |  |  |  |  | (163,000,000) |  | 894,000,000 |  | 1,358,000,000 |
Unrealized gains or losses included in earnings in Level 3 fair value category |  |  |  |  |  |  |  |  | 7,000,000 |  | 0 |  | 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 |  |  |  |  |  |  |  | 35,000,000 |  |  |  | 26,000,000 |
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 |  |  |  |  |  |  |  |  | 93,000,000 |  |  |  | 16,000,000 |
Asset impairment charges after tax |  |  |  |  |  |  |  |  | 69,000,000 |  |  |  | 12,000,000 |
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 | Level 2 | Maximum | Nonregulated Retail Software Development |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets, estimated fair value |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |
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 |  |  |  |  |  |  |
Asset impairment charges after tax |  |  |  |  |  |  | $ 142,000,000 |  |  |  |  |  |  |
Virginia Electric and Power Company | Impairment of Assets and Other Charges | Nonregulated Retail Software Development |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |
Asset impairment charges after tax |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |
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 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 |  |  |  |  |
[1] | Includes income tax expense of $1.3 billion, $197 million and $374 million for the years ended December 31, 2023, 2022 and 2021, respectively.
[2] | See Note 9 for amounts attributable to related parties.

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