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Operating Revenue (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Revenues From Contract With Customer [Line Items] |  |
Revenue recognized from contract liability balances | $ 45 | $ 48
Other Current Liabilities and Other Deferred Credits and Other Liabilities |  |
Revenues From Contract With Customer [Line Items] |  |
Contract liability balances | 52 | 47
Virginia Electric and Power Company |  |
Revenues From Contract With Customer [Line Items] |  |
Revenue recognized from contract liability balances | 40 | 39
Virginia Electric and Power Company | Other Current Liabilities and Other Deferred Credits and Other Liabilities |  |
Revenues From Contract With Customer [Line Items] |  |
Contract liability balances | $ 46 | $ 40

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