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Operating Revenue (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Revenues From Contract With Customer [Line Items] |  |
Revenue recognized from contract liability balances | $ 118 | $ 124
Other Current Liabilities and Other Deferred Credits and Other Liabilities |  |
Revenues From Contract With Customer [Line Items] |  |
Contract liability balances | 150 | 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 | $ 39 | $ 33

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