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Acquisitions and Dispositions (Schedule Of Significant Non Cash And Capital Expenditure) (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Significant noncash items |  |  |
Accrued capital expenditures | [1],[2],[3] | $ 378 | $ 197
Dominion Energy Gas Holdings L L C [Member] |  |  |
Significant noncash items |  |  |
Accrued capital expenditures | [2] | 19 | 72
Dominion Energy Gas Holdings L L C [Member] | East Ohio [Member] |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |
Capital expenditures |  | 267 | 246
Significant noncash items |  |  |
Charge related to a voluntary retirement program |  | 20 |
Accrued capital expenditures |  | 10 | 6
Dominion Energy Gas Holdings L L C [Member] | DGP [Member] |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |
Capital expenditures |  | $ 10 | $ 4
[1] | See Note 17 for noncash financing activities related to the acquisition of the public interest in Dominion Energy Midstream, the remarketing of RSNs and the issuance of stock purchase contracts associated with the 2019 Equity Units.
[2] | See Note 2 for noncash investing and financing activities related to the adoption of a new accounting standard for leasing arrangements.
[3] | See Note 3 for noncash investing and financing activities related to the SCANA Combination.

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