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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 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Goodwill | [1] | $ 7,381 | $ 7,395 | $ 4,859
Dominion Energy Gas Holdings, LLC | GT&S Transaction |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Cash and cash equivalents |  |  | 20 |
Goodwill |  |  | 1,400 |
Current portions of long-term debt |  |  | 699 |
Dominion Energy Gas Holdings, LLC | Q-Pipe Transaction |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Cash and cash equivalents |  | 7 | 11 |
Goodwill |  | $ 191 | $ 191 |
[1] | Goodwill amounts do not contain any accumulated impairment losses.

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