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Fair Value Measurements (Narrative) (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Unrealized gains (losses) included in operating revenue in Level 3 fair value category | $ 12,000,000 |  | $ (10,000,000) |  |  | $ 7,000,000 | $ (8,000,000)
Impairment of assets and other charges | 122,000,000 |  | 1,000,000 |  |  | 219,000,000 | 136,000,000
Level 2 | Nonregulated Solar Assets |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Long-lived assets, estimated fair value |  |  |  | $ 22,000,000 |  |  |
Impairment of Assets and Other Charges | Nonregulated Solar Assets |  |  |  |  |  |  |
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 |  |  |
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 |  |  | $ 91,000,000 |  |
Asset impairment charges after tax |  | $ 12,000,000 |  |  | $ 68,000,000 |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Unrealized gains (losses) included in operating revenue in Level 3 fair value category | 0 |  | $ 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 | 25,000,000 |  |  |  |  |  |
Asset impairment charges after tax | $ 18,000,000 |  |  |  |  |  |

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