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Commitments and Contingencies (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) site | Jul. 31, 2019 USD ($) | May 31, 2019 USD ($) T | Mar. 31, 2019 USD ($) MMcf | Jan. 31, 2019 USD ($) | Aug. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 petition | Apr. 30, 2017 USD ($) petition station | Aug. 31, 2016 T | Apr. 30, 2015 Facility | Sep. 30, 2019 USD ($) site | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) MMcf | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) site Indicator Facility gal | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of separate petitions for reconsideration granted | petition |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (113.0) |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85.0 |  |  | $ 12.0 |  | 1,232.0 | $ 147.0 |  |
Property, plant and equipment, net |  |  | $ 67,978.0 |  |  |  |  |  |  |  |  |  |  | $ 67,978.0 |  |  |  |  | 67,978.0 |  | $ 54,560.0 | [1]
ARO incurred | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,404.0 |  |  |
Nuclear Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum liability protection per nuclear incident amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,900.0 | $ 14,100.0 |  |  |  |  |  |
SOUTH CAROLINA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount claimed by plaintiffs in legal matter |  |  |  |  |  |  |  |  |  |  | $ 100.0 |  |  |  |  |  |  |  |  |  |  |
Percentage claimed by plaintiffs in legal matter |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 55.00% |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  | 55.00% |  |  |
Contesting amount for filed liens in Fairfield country |  |  |  |  |  |  |  | $ 285.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DESC | SCDOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed assessment amount from audit |  |  |  |  |  |  |  |  | $ 410.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Proportional share with NND project |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (113.0) |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38.0 |  |  |  |  | 781.0 |  |  |
Property, plant and equipment, net |  |  | $ 32,402.0 |  |  |  |  |  |  |  |  |  |  | 32,402.0 |  |  |  |  | 32,402.0 |  | 30,521.0 | [3]
Legislation requires for coal combustion residual | MMcf |  |  |  |  |  | 6.8 |  |  |  |  |  |  |  |  |  | 6.8 |  |  |  |  |  |
ARO incurred | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,403.0 |  |  |
Virginia Electric and Power Company | Cost of Landfills and Beneficial Reuse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,400.0 |  | $ 131.0 |  |  |  |
Virginia Electric and Power Company | Increase In Property Plant And Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300.0 |  | 46.0 |  |  |  |
Virginia Electric and Power Company | Increase In Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  |  |
Virginia Electric and Power Company | Future Ash Pond and Landfill Closure Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 202.0 |  |  |  |  |  |
Virginia Electric and Power Company | Other operations and maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113.0 |  | 81.0 |  |  |  |
ARO incurred, after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 84.0 |  | 60.0 |  |  |  |
Virginia Electric and Power Company | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  | 17.0 |  | $ 62.0 | $ 369.0 | $ 160.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges after tax |  |  | 12.0 |  | $ 46.0 | 275.0 | $ 119.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  |  | $ 225.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.0 |  | 13.0 | $ 127.0 |  |
Property, plant and equipment, net |  |  | 11,611.0 |  |  |  |  |  |  |  |  |  |  | 11,611.0 |  |  |  |  | 11,611.0 |  | 11,481.0 | [4]
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount received from SCANA |  | $ 192.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow account |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000.0 |
Credit in future electric rate relief |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000.0 |
Cash payment |  |  |  | $ 117.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  | $ 54.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115.0 |
SCANA | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  |  | 386.0 |  |  |  |  |  |  |  |  |  |  | 386.0 |  |  |  |  | 386.0 |  |  |
SCANA | Other Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivables |  |  | $ 173.0 |  |  |  |  |  |  |  |  |  |  | 173.0 |  |  |  |  | 173.0 |  |  |
SCANA | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  | 38.0 |  |  |  |  | 316.0 |  |  |
Asset impairment charges after tax |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28.0 |  |  |  |  | $ 236.0 |  |  |
SCANA | Minimum | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.0 |
SCANA | Maximum [Member] | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount through stock issuance |  | $ 32.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA | Maximum [Member] | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85.0 |
CCR | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of petition agreed for reconsideration | petition |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generating station facilities heightened entrainment analysis per day | gal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125 |  |  |
Unfavorable Regulatory Action | VDEQ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate initial carbon cap | T |  |  |  |  | 28,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate ultimate carbon cap | T |  |  |  |  | 19,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | CWA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities that may be subject to final regulations | Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |
Unfavorable Regulatory Action | CWA | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate per rear CO2 equivalent | T |  |  |  |  |  |  |  |  |  |  |  | 75,000 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | 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 |  |  |  |  | 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 |  |  |  |  |  |  |  |  | $ 18.0 |  |  |  |  |  |  |  |  | $ 18.0 |  |  |  |
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 |  |  |  |  |  |  |  |  | 16.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense, net of tax |  |  |  |  |  |  |  |  | $ 12.0 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | 12 |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated compliance costs |  |  | $ 10.0 |  |  |  |  |  |  |  |  |  |  | $ 10.0 |  |  |  |  | $ 10.0 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.0 |  |  |
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] | Primarily related to future ash pond and landfill closure costs at certain utility generation facilities. See Note 18 for further information.
[3] | Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[4] | 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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- Definition Asset Impairment Charges After Tax + References No definition available. + Details
Name: | d_AssetImpairmentChargesAfterTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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