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Acquisitions and Dispositions (Acquisition of SCANA) (Narrative) (Detail) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Stock issued during period for acquisition, value |  |  |  |  |  | $ 6,818
Impairment of assets and other charges |  | $ 1,151 | $ 85 |  | $ 1,963 | 1,219
SCANA |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Stock issued during period for acquisition, shares | 95.6 |  |  |  |  |
Stock issued during period for acquisition, value | $ 6,800 |  |  |  |  |
Common stock agreed to be issued, percentage | 0.669% |  |  |  |  |
Total outstanding debt | $ 6,900 |  |  |  |  |
Impairment of assets and other charges |  | 44 | 38 |  | 44 | 316
Impairment of assets and other charges, after tax |  | $ 33 | 28 |  | $ 33 | 236
SCANA | NND Project |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Property, plant and equipment | $ 105 |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  | 105
Impairment of assets and other charges, after tax |  |  |  |  |  | 79
SCANA | Dominion Energy South Carolina Inc |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Period to provide refund to customer |  |  |  | 11 years |  |
Charge for refund of amounts from customers |  |  | 1,000 | $ 1,000 |  | 1,000
After tax charge in statements of income |  |  |  |  |  | 756
SCANA | Dominion Energy South Carolina Inc | NND Project |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Income tax regulatory assets |  |  | $ 264 |  |  | 264
Impairment of assets and other charges |  |  |  |  |  | $ 198

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