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Fair Value Measurements (Narrative) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
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 | $ (3,000,000) | $ 2,000,000 | $ 10,000,000 | $ (6,000,000)
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

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