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Acquisitions and Dispositions (Results of Operations and Pro Forma Information) (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Dominion Energy |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration related costs |  | $ 3 |  | $ 17
SCANA |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Increase in operating revenue | $ 979 |  | $ 2,100 |
Decrease in net income | 97 |  | 1,100 |
Merger and integration related costs |  |  | 570 |
SCANA | Dominion Energy |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration related costs | 29 |  | 596 |
SCANA | Dominion Energy | Voluntary Retirement Program |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration related costs | 4 |  | 427 |
SCANA | Dominion Energy | Other operations and maintenance |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration related costs | 25 |  | 160 |
SCANA | Dominion Energy | Interest and related charges |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration related costs |  |  | $ 9 |
SCANA | Dominion Energy | Maximum | Interest and related charges |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration related costs | $ 1 |  |  |

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