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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
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Significant noncash items |  |  |
Accrued capital expenditures | [1],[2] | $ 343 | $ 201
Dominion Energy Gas Holdings, LLC |  |  |
Significant noncash items |  |  |
Accrued capital expenditures |  | $ 13 | 31
East Ohio | Dominion Energy Gas Holdings, LLC |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Capital expenditures |  |  | 65
Significant noncash items |  |  |
Accrued capital expenditures |  |  | 6
DGP | Dominion Energy Gas Holdings, LLC |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Capital expenditures |  |  | $ 3
[1] | See Note 16 for noncash financing activities related to the acquisition of the public interest in Dominion Energy Midstream.
[2] | See Note 3 for noncash investing and financing activities related to the SCANA Combination.

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