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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, 2020 | Sep. 30, 2020 USD ($) | Aug. 31, 2020 USD ($) | Apr. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jul. 31, 2019 USD ($) | May 31, 2019 T | Feb. 28, 2019 USD ($) | Aug. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Apr. 30, 2017 Petition | Aug. 31, 2016 T | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Facility Indicator site gal | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,151.0 |  |  | $ 85.0 | $ 1,963.0 | $ 1,219.0 |  |  |
Property, plant and equipment, net |  | $ 56,788.0 |  |  |  | $ 57,200.0 | [1] |  |  |  |  |  |  |  | 56,788.0 |  |  |  | 56,788.0 |  | $ 57,200.0 | [1] |
Nuclear Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability protection per nuclear incident available amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,800.0 | $ 13,900.0 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, benefit fund |  |  |  |  | $ 320.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount through stock issuance |  | 322.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, benefit fund |  |  |  |  | 520.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for SCANA legal proceedings |  | 228.0 |  |  |  | 696.0 | [1] |  |  |  |  |  |  |  | 228.0 |  |  |  | 228.0 |  | 696.0 | [1] |
Other expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.0 |  |  |  |
Other expense, after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.0 |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44.0 |  |  | 38.0 | 44.0 | 316.0 |  |  |
Impairment of assets and other charges, after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.0 |  |  | 28.0 | 33.0 | 236.0 |  |  |
Escrow account |  |  |  |  | $ 160.0 |  |  |  |  |  |  |  |  |  |  |  | $ 160.0 |  |  |  |  |  |
Litigation settlement, amount received from SCANA |  |  | $ 32.5 |  |  | 192.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for civil monetary penalty from SCANA |  |  |  | $ 25.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115.0
Proceeds from sale of property |  | 38.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  | 3.0 | $ 27.0 |  |  |  |  |  |  |  |  |  |  |  | 3.0 |  |  |  | 3.0 |  |  |  |
SCANA | Other Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivables |  | 8.0 |  |  |  | 111.0 |  |  |  |  |  |  |  |  | 8.0 |  |  |  | 8.0 |  | 111.0 |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contesting amount for filed liens in Fairfield country |  |  |  |  |  |  |  |  |  |  | $ 285.0 |  |  |  |  |  |  |  |  |  |  |  |
DESC | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed assessment amount from audit |  |  |  |  |  |  |  |  |  |  |  | $ 410.0 |  |  |  |  |  |  |  |  |  |  |
Proportional share of NND project |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
DESC | SOUTH CAROLINA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount claimed by plaintiffs in legal matter |  |  |  |  |  |  |  |  |  | $ 100.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage claimed by plaintiffs in legal matter |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA and DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disgorgement and prejudgment interest total, amount |  |  |  | $ 112.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | SCANA | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.0
Maximum | SCANA | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount through stock issuance |  |  |  |  |  | 32.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | SCANA | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85.0
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.0 |  |  | $ 38.0 | 1,008.0 | $ 781.0 |  |  |
Property, plant and equipment, net |  | $ 32,028.0 |  |  |  | $ 32,882.0 | [2] |  |  |  |  |  |  |  | $ 32,028.0 |  |  |  | $ 32,028.0 |  | 32,882.0 | [2] |
DESC | NND Project Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership in total units |  | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  | 55.00% |  |  |  |
Unfavorable Regulatory Action | VDEQ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate initial carbon cap | T |  |  |  |  |  |  |  |  | 28,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate carbon cap reduction percentage per year |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate ultimate carbon cap | T |  |  |  |  |  |  |  |  | 19,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate regional carbon cap | T |  |  |  |  |  |  |  |  | 27,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generating station facilities heightened entrainment analysis per day | gal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |
Carbon Regulations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate per rear CO2 equivalent | T |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000 |  |  |  |  |  |  |  |  |
CWA | Unfavorable Regulatory Action |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mandatory facility-specific factors | Indicator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Number of optional facility-specific factors | Indicator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |
Number of facilities that are subject to final regulations | Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |
CWA | Unfavorable Regulatory Action | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generating stations with water withdrawals per day | gal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |
CWA | Unfavorable Regulatory Action | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities that are subject to final regulations | Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |
CWA | Unfavorable Regulatory Action | 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 |  |  |  |  |  |  |  |  |  |
CWA | Unfavorable Regulatory Action | EPA | Minimum | Subsequent Event | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingencies individual circumstances period | 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CWA | Unfavorable Regulatory Action | EPA | Maximum | Subsequent Event | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingencies individual circumstances period | 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Waste Management and Remediation | Unfavorable Regulatory Action | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites remediation work substantially completed | site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |
Number of sites with remediation plans | site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Number of sites with an updated work plan | site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Updated work plan, cost increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.0 |  |  |  |
Number of additional sites which are not under investigation | site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |
Waste Management and Remediation | Unfavorable Regulatory Action | EPA | Former Gas Plant Site With Post Closure Groundwater Monitoring Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.0 |  | 30.0 |  |
Waste Management and Remediation | Unfavorable Regulatory Action | EPA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites with remediation plans | site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of additional sites which are not under investigation | site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Waste Management and Remediation | Unfavorable Regulatory Action | EPA | Virginia Electric and Power Company | Former Gas Plant Site With Post Closure Groundwater Monitoring Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16.0 |  | $ 16.0 |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.

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