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Acquisitions and Dispositions (Schedule of Disposal Groups, Including Discontinued Operations Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Business Acquisition And Dispositions [Line Items] |  |  |  |
Current assets of discontinued operations |  | $ 228 |  |
Current liabilities of discontinued operations |  | 85 |  |
Dominion Energy Gas Holdings L L C [Member] |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |
Noncurrent assets of discontinued operations |  | 6,178 | $ 5,849 | [1]
Noncurrent liabilities of discontinued operations |  | 3,194 | 2,896 | [1]
East Ohio [Member] | Dominion Energy Gas Holdings L L C [Member] |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |
Current assets of discontinued operations | [2] | 268 | 423 |
Investments |  | 2 | 2 |
Property, plant and equipment, net |  | 3,866 | 3,669 |
Regulatory assets |  | 675 | 711 |
Other deferred charges and other assets, including goodwill and intangible assets |  | 1,440 | 1,275 |
Noncurrent assets of discontinued operations |  | 5,983 | 5,657 |
Current liabilities of discontinued operations |  | 1,055 | 1,262 |
Long-term debt |  | 1,554 | 1,300 |
Deferred income taxes and investment tax credits |  | 741 | 716 |
Regulatory liabilities |  | 769 | 747 |
Other deferred credits and liabilities |  | 110 | 108 |
Noncurrent liabilities of discontinued operations |  | 3,174 | 2,871 |
DGP [Member] | Dominion Energy Gas Holdings L L C [Member] |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |
Current assets of discontinued operations | [3] | 24 | 21 |
Noncurrent assets of discontinued operations | [4] | 195 | 192 |
Current liabilities of discontinued operations |  | 7 | 11 |
Noncurrent liabilities of discontinued operations |  | $ 20 | $ 25 |
[1] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Includes cash and cash equivalents of $5 million and $9 million as of September 30, 2019 and December 31, 2018, respectively.
[3] | Includes cash and cash equivalents of $5 million and less than $1 million dollars as of September 30, 2019 and December 31, 2018, respectively.
[4] | Primarily property, plant and equipment, net.

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