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Acquisitions and Dispositions (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Significant noncash items: |  |  |
Accrued capital expenditures | [1] | $ 745 | $ 374
Dominion Energy Gas Holdings, LLC | Q-Pipe Group |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Capital expenditures |  |  | 26
Significant noncash items: |  |  |
Accrued capital expenditures |  |  | $ 2
[1] | See Note 10 for noncash investing activities related to the acquisition of a noncontrolling interest in Dominion Privatization and Notes 16 and 17 for noncash financing activities related to the remarketing of Series A Preferred Stock and the issuance of common stock and transfer of property associated with the settlement of litigation.

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