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Acquisitions and Dispositions (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Significant noncash items |  |  |  |  |
Impairment of assets and other charges |  | $ 1,996 | $ 182 |  | $ 2,345
Depreciation, depletion and amortization |  | 2,830 | 2,478 |  | 2,332
Accrued capital expenditures | [1],[2] | $ 979 | 637 |  | 485
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 |  |  | $ 34 | [3] | 38
Significant noncash items |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  | 27
Accrued capital expenditures |  |  |  |  | 1
Dominion Energy Gas Holdings, LLC | GT&S Transaction |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Capital expenditures | [3] |  |  |  | 292
Significant noncash items |  |  |  |  |
Impairment of assets and other charges | [3] |  |  |  | 469
Depreciation, depletion and amortization | [3] |  |  |  | $ 177
[1] | See Note 9 for noncash investing activities related to the acquisition of a noncontrolling interest in Wrangler and Dominion Privatization.
[2] | See Notes 18, 19, 20 and 23 for noncash financing activities related to the contribution of stock to Dominion Energy’s defined benefit pension plan, remarketing of Series A Preferred Stock, derivative restructuring and the issuance of common stock and transfer of property associated with the settlement of litigation.
[3] | Operations associated with the Q-Pipe Group are through the December 31, 2021 closing date. Operations associated with the GT&S Transaction are through the November 1, 2020 closing date.

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