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Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Debt and Equity Securities, FV-NI [Line Items] |  |
Net assets related to pending sales of securities | $ 42 |
Net assets related to pending purchases of securities |  | $ 35
Fair value of securities in an unrealized loss position | 1,600 | 883
Virginia Electric and Power Company |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Net assets related to pending sales of securities | 24 | 5
Fair value of securities in an unrealized loss position | $ 946 | $ 425

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