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Acquisitions and Dispositions (Acquisition of SCANA) (Narrative) (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 16, 2016 | Jan. 31, 2019 | Oct. 31, 2017 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued during period for acquisition, value |  |  |  |  |  |  |  | $ 6,818 |  |  |
Regulatory Liabilities |  |  |  | $ 11,331 |  |  |  | 11,331 |  |  | $ 7,196
Regulatory liabilities-current |  |  |  | 523 |  |  |  | 523 |  |  | $ 356
Net income |  |  |  | 54 |  |  | $ 449 | (626) |  | $ 952 |
SCANA |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued during period for acquisition, shares |  | 95,600,000 |  |  |  |  |  |  |  |  |
Stock issued during period for acquisition, value |  | $ 6,800 |  |  |  |  |  |  |  |  |
Common stock agreed to be issued, percentage |  | 66.90% |  |  |  |  |  |  |  |  |
Total outstanding debt |  | $ 6,900 |  | 13,107 |  |  |  | 13,107 |  |  |
Business combination, refund to customers |  | $ 2,000 |  |  |  |  |  |  |  |  |
Period to provide refund to customer |  | 20 years | 20 years |  |  | 11 years |  |  |  |  |
Regulatory Liabilities |  |  | $ 1,100 |  |  | $ 1,000 |  |  |  |  |
Regulatory liabilities-current |  |  | 67 |  |  | 137 |  |  |  |  |
Refund Liability to electric service customers |  |  | 1,000 |  |  |  |  |  |  |  |
Reduction in operating revenue |  |  |  |  |  | $ (1,000) |  |  |  |  |
Net income |  |  |  |  |  |  |  | (756) |  |  |
Business combination cost related to exclusion from rate recovery |  | $ 2,400 |  |  |  |  |  |  |  |  |
Remaining regulatory asset |  | 2,800 |  | $ 3,940 | [1] |  |  | $ 3,940 | [1] |  |
Remaining regulatory asset current |  | 138 |  |  |  |  |  |  |  |  |
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 | 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 $264 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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