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Operating Revenue (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Revenues From Contract With Customer [Line Items] |  |  |
Revenue recognized from contract liability balances | $ 145 | $ 119 |
Other Current Liabilities and Other Deferred Credits and Other Liabilities |  |  |
Revenues From Contract With Customer [Line Items] |  |  |
Contract liability balances | 93 |  | $ 150
Virginia Electric and Power Company |  |  |
Revenues From Contract With Customer [Line Items] |  |  |
Revenue recognized from contract liability balances | 39 | $ 33 |
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 | $ 51 |  | $ 39

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