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Acquisitions and Dispositions (Results of Operations and Pro Forma Information) (Narrative) (Detail) - SCANA - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |
Increase in operating revenue | $ 809,000,000 | $ 979,000,000 | $ 2,400,000,000 | $ 2,100,000,000
Increase (decrease) in net income | 85,000,000 | 97,000,000 | 197,000,000 | (1,100,000,000)
Merger and integration-related costs |  |  |  | 408,000,000
Dominion Energy |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration-related costs | 22,000,000 | 29,000,000 | 64,000,000 | 596,000,000
Dominion Energy | Voluntary Retirement Program |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration-related costs |  | 4,000,000 |  | 427,000,000
Dominion Energy | Other Operations and Maintenance |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration-related costs | $ 22,000,000 | 25,000,000 | $ 61,000,000 | 169,000,000
Dominion Energy | Interest and Related Charges |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration-related costs |  |  |  | $ 9,000,000
Dominion Energy | Interest and Related Charges | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration-related costs |  | $ 1,000,000 |  |

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