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Acquisitions and Dispositions (Acquisition Of Scana) (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 16, 2016 | Feb. 28, 2019 | Jan. 31, 2019 | Aug. 31, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Oct. 31, 2017 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Dec. 31, 2015
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period for acquisition, shares |  |  |  | 22,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period for acquisition, value |  |  |  | $ 1,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities |  |  |  |  |  |  |  |  |  | $ 7,196 |  |  |  | $ 7,109 |  |  |  | $ 7,196 | $ 7,109 |  |  |
Regulatory liabilities-current | [1] |  |  |  |  |  |  |  |  | 356 |  |  |  | 193 |  |  |  | 356 | 193 |  |  |
After tax charge in statements of income |  |  |  |  |  |  |  |  |  | 641 | $ 854 | $ 449 | $ 503 | 1,312 | $ 665 | $ 390 | $ 632 | 2,447 | 2,999 | $ 2,123 |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, restricted cash and equivalents |  |  |  |  |  |  |  |  |  | 391 |  |  |  | 185 |  |  |  | 391 | 185 | $ 322 |  | $ 632
Deferred tax asset recorded on federal net operating loss carryforwards |  |  |  |  |  |  |  |  |  | 1,800 |  |  |  |  |  |  |  | 1,800 |  |  |  |
Deferred tax asset recorded on state net operating loss carryforwards |  |  |  |  |  |  |  |  |  | 2,400 |  |  |  |  |  |  |  | 2,400 |  |  |  |
Valuation allowance, deferred tax asset, change in amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106 |  |  |  |
Property, plant and equipment, in service |  |  |  |  |  |  |  |  |  | $ 76,578 |  |  |  | $ 74,823 |  |  |  | $ 76,578 | $ 74,823 |  |  |
Intangible assets, weighted-average amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  | 20,000,000 |  |  |  | 20,000,000 | 20,000,000 |  |  |
Return of equity percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.50% |  |
Decrease in revenue requirement, natural gas rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20 |  |  |  |
Decrease in revenue requirement, adjustments to customer rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |
Before tax charge in statements of income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,129 | $ 3,090 | $ 2,867 |  |
Liabilities recorded |  |  |  |  |  |  |  |  |  | $ 55,866 |  |  |  | $ 57,215 |  |  |  | 55,866 | $ 57,215 |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charitable contributions, annual committed increase for next five years |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock agreed to issue |  |  |  | 66.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period for acquisition, shares |  |  |  | 95,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period for acquisition, value |  |  |  | $ 6,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combination debt outstanding |  |  |  | 6,900 |  |  |  |  |  | 13,083 |  |  |  |  |  |  |  | $ 13,083 |  |  |  |
Business combination, refund to customers |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period to provide refund to customer |  |  |  | 20 years |  |  |  |  | 11 years |  |  |  |  |  |  |  |  | 20 years |  |  |  |
Regulatory Liabilities |  |  |  |  |  |  |  | $ 1,100 | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Refund Liability to electric service customers |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Reduction in operating revenue |  |  |  |  |  |  |  |  | (1,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liabilities-current |  |  |  |  |  |  |  |  | 140 |  |  |  |  |  |  |  |  |  |  |  |  |
After tax charge in statements of income |  |  |  |  |  |  |  |  | (756) |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination cost related to exclusion from rate recovery |  |  |  | $ 2,400 |  |  |  |  |  |  |  |  |  |  |  |  |  | 105 |  |  |  |
Remaining regulatory asset |  |  |  | 2,800 |  |  |  |  |  | 4,219 |  |  |  |  |  |  |  | 4,219 |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charitable contributions, annual committed increase for next five years |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, restricted cash and equivalents |  |  |  |  |  |  |  |  |  | 389 |  |  |  |  |  |  |  | 389 |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  | 115 |  |  |  |  |  |  |  | 115 |  |  |  |
Equity method investment |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  | 20 |  |  |  |
Business combination cost related to exclusion from rate recovery, after tax charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79 |  |  |  |
Property, plant and equipment, in service |  |  |  |  |  |  |  |  |  | 16,331 |  |  |  |  |  |  |  | 16,331 |  |  |  |
Regulatory assets for deferred income tax |  |  |  |  |  |  |  |  |  | 190 |  |  |  |  |  |  |  | 190 |  |  |  |
Regulatory assets deferred, expected to be recognized |  |  |  |  |  |  |  |  | 145 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  | 281 |  |  |  |  |  |  |  | 281 |  |  |  |
Intangible assets, accumulated amortization |  |  |  |  |  |  |  |  |  | 181 |  |  |  |  |  |  |  | $ 181 |  |  |  |
Intangible assets, weighted-average amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Tender offer expire date |  |  | Mar. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of medium term notes |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, no par value |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision of bill credits impact on retail electric customer rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |
Reduction in base rates to retail electric customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67 |  |  |  |
Transaction cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |
SCANA | Provision for future cost of removal and AROs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 577 |  |  |  |
Business combination, consideration, liabilities incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23 |  |  |  |
SCANA | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charitable contributions, period committed for annual increase |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
SCANA | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78 years |  |  |  |
SCANA | SCE&G Ratepayer Case [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After tax charge in statements of income |  |  |  |  |  |  |  |  | (135) |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow account |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  | $ 2,000 |  |  |  |
Credit in future electric rate relief |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  |  |  |
Cash payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115 |  |  |  |
Before tax charge in statements of income |  |  |  |  |  |  |  |  | $ (180) |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA | SCE&G Ratepayer Case [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 |  |  |  |
SCANA | SCE&G Ratepayer Case [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA | V.C. Summer Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  | 66.70% |  |  |  |  |  |  |  | 66.70% |  |  |  |
Property, plant and equipment, in service |  |  |  |  |  |  |  |  |  | $ 1,500 |  |  |  |  |  |  |  | $ 1,500 |  |  |  |
Property, plant and equipment, accumulated depreciation |  |  |  |  |  |  |  |  |  | 644 |  |  |  |  |  |  |  | 644 |  |  |  |
Property, plant and equipment, under construction |  |  |  |  |  |  |  |  |  | $ 128 |  |  |  |  |  |  |  | $ 128 |  |  |  |
SCE&G [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |  |  |  | 55.00% |  |  |  |
Repurchase of first mortgage bonds |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of additional first mortgage bonds |  |  | $ (1,200) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tender offer expire date |  |  | Mar. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |
Percentage of average residential electric bill |  |  |  |  |  | 18.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in revenue |  |  |  |  |  | $ 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recover of cost and net lost revenue with incentive |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities recorded |  |  |  |  |  |  |  |  |  | $ 11 |  |  |  |  |  |  |  | $ 11 |  |  |  |
Contesting amount for filed liens in Fairfield country |  |  |  |  | $ 285 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum assessment cost,per incident |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92 |  |  |  |
Maximum yearly assessment per nuclear incident |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |
Maximum amount of coverage to nuclear facility for property damage and outage costs |  |  |  |  |  |  |  |  |  | $ 2,800 |  |  |  |  |  |  |  | 2,800 |  |  |  |
Maximum loss for a single nuclear incident |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800 |  |  |  |
Maximum prosepective insurance premium per nuclear incident |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23 |  |  |  |
NEIL Maximum Insurance Coverage To Nuclear Facility For Property Damage And Outage Costs From Non-Nuclear Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 415 |  |  |  |
Maximum Retrospective Premium Assessment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2 |  |  |  |
SCE&G [Member] | SCDOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportional share with NND project |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed assessment amount from audit |  |  |  |  |  |  | $ 410 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCE&G [Member] | South Carolina [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount claimed by plaintiffs in legal matter |  |  |  |  |  | $ 75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportional share with NND project |  |  |  |  |  | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCE&G [Member] | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Current regulatory liabilities are presented in other current liabilities in Dominion Energy and Dominion Energy Gas’ Consolidated Balance Sheets.

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