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Acquisitions and Dispositions (Schedule of Results of Operations Reported As Discontinued Operations) (Detail) - Dominion Energy Gas Holdings, LLC - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Net income (loss) from discontinued operations | $ 0 | $ 26 | $ 0 | $ 80
East Ohio |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Operating revenue |  | 154 |  | 383
Depreciation and amortization |  | 22 |  | 43
Other operating expenses |  | 128 |  | 277
Other income |  | 18 |  | 37
Interest and related charges |  | 8 |  | 18
Income tax expense |  | 3 |  | 17
Net income (loss) from discontinued operations |  | 11 |  | 65
DGP |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Operating revenue |  | 34 |  | 79
Depreciation and amortization |  | 1 |  | 2
Other operating expenses |  | 12 |  | 56
Income tax expense |  | 6 |  | 6
Net income (loss) from discontinued operations |  | $ 15 |  | $ 15

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