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Derivatives and Hedge Accounting Activities (Narrative) (Detail) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |
Derivative instruments designated in fair value hedges | $ 0 | $ 0 | $ 0
Virginia Power |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |
Derivative instruments designated in fair value hedges | $ 0 | $ 0 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Net fair value of all derivative instruments designated as fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 5 -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480463/815-10-45-5 + Details
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- Details
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