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Acquisitions and Dispositions (Schedule of Disposal Groups, Including Discontinued Operations Consolidated Statements of Income) (Detail) - Dominion Energy Gas Holdings L L C [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition And Dispositions [Line Items] |  |  |  |
Net income from discontinued operations | $ 45 | $ 33 | $ 125 | $ 135
Discontinued Operations [Member] | East Ohio [Member] |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |
Operating revenue | 155 | 148 | 538 | 527
Depreciation and amortization | 23 | 19 | 66 | 55
Other operating expenses | 90 | 88 | 364 | 322
Other income | 20 | 18 | 55 | 54
Interest and related charges | 11 | 10 | 30 | 27
Income tax expense | 8 | 13 | 25 | 39
Net income from discontinued operations | 43 | 36 | 108 | 138
Discontinued Operations [Member] | DGP [Member] |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |
Operating revenue | 31 | 42 | 110 | 144
Depreciation and amortization | 1 | 4 | 4 | 11
Other operating expenses | 27 | 42 | 83 | 137
Income tax expense | 1 | (1) | 6 | (1)
Net income from discontinued operations | $ 2 | $ (3) | $ 17 | $ (3)

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