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Operating Revenue (Narrative) (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Revenues From Contract With Customer [Line Items] |  |  |
Contract liability balances | $ 45 |  | $ 52
Revenue recognized from contract liability balances | 50 | $ 45 |
Virginia Electric and Power Company |  |  |
Revenues From Contract With Customer [Line Items] |  |  |
Contract liability balances | 38 |  | $ 46
Revenue recognized from contract liability balances | $ 46 | $ 40 |

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