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Fair Value Measurements (Narrative) (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 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 | $ 13,000,000 | $ (8,000,000)
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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