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Acquisitions and Dispositions (Results of Operations and Pro Forma Information) (Narrative) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019
Dominion Energy |  |
Business Acquisition [Line Items] |  |
Merger and integration related costs | $ 10,000,000 | $ 14,000,000
SCANA |  |
Business Acquisition [Line Items] |  |
Increase in operating revenue | 909,000,000 | 1,100,000,000
Decrease in net income | 102,000,000 | 1,200,000,000
Merger and integration related costs |  | 548,000,000
SCANA | Dominion Energy |  |
Business Acquisition [Line Items] |  |
Merger and integration related costs | 443,000,000 | 567,000,000
SCANA | Dominion Energy | Voluntary Retirement Program |  |
Business Acquisition [Line Items] |  |
Merger and integration related costs | 423,000,000 | 423,000,000
SCANA | Dominion Energy | Other operations and maintenance |  |
Business Acquisition [Line Items] |  |
Merger and integration related costs | 20,000,000 | 135,000,000
SCANA | Dominion Energy | Interest and related charges |  |
Business Acquisition [Line Items] |  |
Merger and integration related costs | $ 0 | $ 9,000,000

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