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Acquisitions and Dispositions (Schedule of Major Classes of Assets and Liabilities Reported As Held for Sale in Discontinued Operations) (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Goodwill | $ 7,395 | $ 7,395 | [1]
Dominion Energy Gas Holdings, LLC | Gas, Transmission & Storage |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Cash, restricted cash and equivalents of discontinued operations | 24 | 20 |
Goodwill | 1,400 | 1,400 |
Current portions of long-term debt | 1,200 | 699 |
Dominion Energy Gas Holdings, LLC | Gas, Transmission & Storage | Supply Header Project |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Property, plant and equipment | 40 |  |
Asset retirement obligation, Current | 47 |  |
Dominion Energy Gas Holdings, LLC | Q-Pipe Transaction |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Cash, restricted cash and equivalents of discontinued operations | 25 | 11 |
Goodwill | $ 191 | $ 191 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.

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