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Acquisitions and Dispositions (Results of Operations and Pro Forma Information) (Narrative) (Detail) - SCANA - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |
Increase in operating revenue | $ 701,000,000 | $ 909,000,000 | $ 1,600,000,000 | $ 1,100,000,000
Increase (decrease) in net income | 58,000,000 | (102,000,000) | 112,000,000 | (1,200,000,000)
Merger and integration-related costs |  |  |  | 446,000,000
Dominion Energy |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration-related costs | 23,000,000 | 443,000,000 | 42,000,000 | 567,000,000
Dominion Energy | Voluntary Retirement Program |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration-related costs |  | 423,000,000 |  | 423,000,000
Dominion Energy | Other Operations and Maintenance |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration-related costs | $ 20,000,000 | 20,000,000 | $ 39,000,000 | 135,000,000
Dominion Energy | Interest and Related Charges |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration-related costs |  | $ 0 |  | $ 9,000,000

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