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Acquisitions and Dispositions (Acquisition of SCANA) (Narrative) (Detail) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2019 | Oct. 31, 2017 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Stock issued during period for acquisition, value |  |  |  |  |  | $ 6,818
Regulatory Liabilities |  |  |  |  | $ 10,996 | 10,659
Regulatory liabilities-current |  |  |  |  | 809 | $ 455
SCANA |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Stock issued during period for acquisition, shares |  | 95.6 |  |  |  | 95.6
Stock issued during period for acquisition, value |  | $ 6,800 |  |  |  | $ 6,800
Common stock agreed to be issued, percentage |  | 0.669% |  |  |  |
Total outstanding debt |  | $ 6,900 |  |  |  | 6,707
Business combination, refund to customers |  | $ 2,000 |  |  |  |
Period to provide refund to customer |  | 20 years | 20 years |  |  |
Regulatory Liabilities |  |  | $ 1,100 |  |  |
Regulatory liabilities-current |  |  | 67 |  |  |
Refund Liability to electric service customers |  |  | 1,000 |  |  |
Remaining regulatory asset | [1] |  |  |  |  | 3,940
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Charitable contributions, annual committed increase for next five years |  |  |  |  | $ 1 |
SCANA | Minimum |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Charitable contributions, period committed for annual increase |  | 5 years |  |  |  |
SCANA | NND Project |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Period to provide refund to customer |  | 20 years |  |  |  |
Business combination cost related to exclusion from rate recovery |  | $ 2,400 |  |  |  |
Remaining regulatory asset |  | 2,800 |  |  |  |
Remaining regulatory asset current |  | 138 |  |  |  |
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 |  |
Charge for refund of amounts from customers, current |  |  |  | $ 137 |  |
After tax charge in statements of income |  |  |  |  |  | $ 756
SCANA | Toshiba Corporation |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Cash consideration |  |  | $ 1,100 |  |  |
SCANA | Columbia Energy |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |
Business combination cost related to exclusion from rate recovery |  | $ 180 |  |  |  |
[1] | Includes $258 million of certain income tax-related regulatory assets associated with the NND Project for which Dominion Energy committed to forgo recovery in accordance with the SCANA Merger Approval Order. See Note 5 for additional information.

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