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Acquisitions and Dispositions (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Significant noncash items: |  |
Accrued capital expenditures | $ 425 | $ 341
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 |  | 3
Significant noncash items: |  |
Accrued capital expenditures |  | $ 2

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