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Operating Revenue (Narrative) (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Revenues From Contract With Customer [Line Items] |  |  |
Revenue recognized from contract liability balances | $ 120 | $ 124 |
Other Current Liabilities and Other Deferred Credits and Other Liabilities |  |  |
Revenues From Contract With Customer [Line Items] |  |  |
Contract liability balances | 159 |  | $ 124
Virginia Electric and Power Company |  |  |
Revenues From Contract With Customer [Line Items] |  |  |
Revenue recognized from contract liability balances | 33 | $ 36 |
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 | $ 43 |  | $ 33

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