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Acquisitions and Dispositions (Schedule of Disposal Groups, Including Discontinued Operations Consolidated Statements of Income) (Detail) - Dominion Energy Gas Holdings LLC [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition And Dispositions [Line Items] |  |  |  |
Net income from discontinued operations | $ 26 | $ 45 | $ 80 | $ 102
Discontinued Operations [Member] | East Ohio [Member] |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |
Operating revenue | 154 | 164 | 383 | 379
Depreciation and amortization | 22 | 19 | 43 | 36
Other operating expenses | 128 | 99 | 277 | 235
Other income | 18 | 18 | 37 | 36
Interest and related charges | 8 | 9 | 18 | 17
Income tax expense | 3 | 11 | 17 | 26
Net income from discontinued operations | 11 | 44 | 65 | 101
Discontinued Operations [Member] | DGP [Member] |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |
Operating revenue | 34 | 52 | 79 | 102
Depreciation and amortization | 1 | 4 | 2 | 7
Other operating expenses | 12 | 47 | 56 | 94
Income tax expense | 6 |  | 6 |
Net income from discontinued operations | $ 15 | $ 1 | $ 15 | $ 1

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