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Commitments and Contingencies (Narrative) (Detail) MMcf in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) site MMcf | Aug. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 Petition | Jun. 30, 2017 | Apr. 30, 2017 station Petition | Aug. 31, 2016 T | Apr. 30, 2015 Facility | Mar. 31, 2019 USD ($) Facility site Indicator gal MMcf | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) GasFiredUnit | Oct. 31, 2017 USD ($) | Oct. 31, 2015 ppb
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  |  |  |  |  |  |  | $ (113) |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  | 835 | $ 1 |  |  |  |
Liabilities recorded | $ 72,455 |  |  |  |  |  |  |  |  | 72,455 |  | $ 55,866 | [1] |  |
Regulatory liability | 11,411 |  |  |  |  |  |  |  |  | 11,411 |  | 7,196 |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities recorded | $ 20 |  |  |  |  |  |  |  |  | $ 20 |  |  |  |  |
Equity method investment, ownership percentage | 55.00% |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |
Contesting amount for filed liens in Fairfield country |  | $ 285 |  |  |  |  |  |  |  |  |  |  |  |  |
DESC | SCDOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportional share with NND project |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Proposed assessment amount from audit |  |  |  | $ 410 |  |  |  |  |  |  |  |  |  |  |
DESC | SOUTH CAROLINA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount claimed by plaintiffs in legal matter |  |  | $ 75 |  |  |  |  |  |  |  |  |  |  |  |
Proportional share with NND project |  |  | 55.00% |  |  |  |  |  |  |  |  |  |  |  |
Minimum | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  | 60 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  |  |  |  |  |  |  | $ (113) |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  | 546 |  |  |  |  |
Liabilities recorded | $ 26,330 |  |  |  |  |  |  |  |  | 26,330 |  | 23,833 | [2] |  |
Regulatory liability | 5,089 |  |  |  |  |  |  |  |  | $ 5,089 |  | 4,946 |  |  |
Virginia Electric and Power Company | Cost of Landfills and Beneficial Reuse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred | 2,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Increase In Property Plant And Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred | 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Future Ash Pond and Landfill Closure Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred | 202 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Other operations and maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred | 113 |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred, after tax | $ 84 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legislation requires for coal combustion residual | MMcf | 6.8 |  |  |  |  |  |  |  |  | 6.8 |  |  |  |  |
Virginia Electric and Power Company | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement | $ 225 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities recorded | 18,156 |  |  |  |  |  |  |  |  | $ 18,156 |  | 17,886 | [3] |  |
Regulatory liability | 845 |  |  |  |  |  |  |  |  | 845 |  | 789 |  |  |
SCANA | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow account |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  |  |
Credit in future electric rate relief |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  |  |
Cash payment |  |  |  |  |  |  |  |  |  |  |  | 115 |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  | 169 |  |  |  |  |
Asset impairment charges after tax |  |  |  |  |  |  |  |  |  | 126 |  |  |  |  |
SCANA | Maximum [Member] | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  | $ 85 |  |  |
Federal Energy Regulatory Commission | Virginia Electric and Power Company | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liability | $ 14 |  |  |  |  |  |  |  |  | $ 14 |  |  |  |  |
CWA | EPA | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compliance date |  |  |  |  | 2023-12 |  |  |  |  |  |  |  |  |  |
CWA | EPA | 2015 Effluent Limitations Guidelines Rule for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compliance date |  |  |  |  | 2020-11 |  |  |  |  |  |  |  |  |  |
CCR | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of petition agreed for reconsideration | Petition |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate per rear CO2 equivalent | T |  |  |  |  |  |  |  | 75,000 |  |  |  |  |  |  |
Electric generating stations with water withdrawals per day | gal |  |  |  |  |  |  |  |  |  | 125 |  |  |  |  |
Unfavorable Regulatory Action | MATS | EPA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of effective days to operate power station units |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Ozone Standards | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standard emission level prior to revision | ppb |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75
Revised emission standard level | ppb |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70
Unfavorable Regulatory Action | Ozone Standards | EPA | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated compliance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |
Unfavorable Regulatory Action | Ozone Standards | EPA | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated compliance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35 |
Unfavorable Regulatory Action | Ozone Standards | EPA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of natural gas fired units to place at facility | GasFiredUnit |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Unfavorable Regulatory Action | CWA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities that may be subject to final regulations | Facility |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |
Unfavorable Regulatory Action | CWA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mandatory facility-specific factors | Indicator |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Number of optional facility-specific factors | Indicator |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |
Number of facilities that may be subject to final regulations | Facility |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |
Unfavorable Regulatory Action | CWA | EPA | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of separate petitions for reconsideration granted | Petition |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant sites | site | 22 |  |  |  |  |  |  |  |  | 22 |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Former Gas Plant Site with Post Closure Groundwater Monitoring Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former sites | site |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant sites | site | 3 |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company | Former Gas Plant Site with Post Closure Groundwater Monitoring Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated compliance costs |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company | Former Gas Plant Site with Post Closure Groundwater Monitoring Program | Other operations and maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense, net of tax |  |  |  | $ 12 |  |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant sites | site | 12 |  |  |  |  |  |  |  |  | 12 |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated compliance costs | $ 10 |  |  |  |  |  |  |  |  | $ 10 |  |  |  |  |
Number of sites under investigation, remediation and monitoring | site |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Number of sites with an updated remediation work plan | site |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Updated remediation work plan, cost increase |  |  |  |  |  |  |  |  |  | $ 8 |  |  |  |  |
Unfavorable Regulatory Action | CCR | EPA | Environmental Protection Agency Final Rule Regulating Management of CCRs | Facilities Subject to Coal Combustion Residual Final Rule |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities with CCR | Facility |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |
Unfavorable Regulatory Action | CCR | EPA | Virginia Electric and Power Company | Environmental Protection Agency Final Rule Regulating Management of CCRs | Facilities Subject to Coal Combustion Residual Final Rule |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities with CCR | Facility |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |
Number of stations | station |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.

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