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Fair Value Measurements (Narrative) (Detail) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impairment of assets and other charges | $ 30,000,000 | $ 98,000,000
Unrealized gains (losses) included in operating revenue in Level 3 fair value category | (8,000,000) |
Maximum |  |
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 |  | 1,000,000
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 (losses) included in operating revenue in Level 3 fair value category | $ 0 | $ 0

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