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Commitments and Contingencies (Narrative) (Detail) gal in Millions, MMcf in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 01, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jul. 31, 2019 USD ($) | May 31, 2019 USD ($) T | Mar. 31, 2019 USD ($) MMcf | Feb. 28, 2019 USD ($) | Jan. 31, 2019 USD ($) | Aug. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Aug. 31, 2016 T | Apr. 30, 2015 Facility | Mar. 31, 2019 USD ($) MMcf | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) Facility gal | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,413.0 | [1] | $ 20.0 |
Regulatory liability |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,498.0 |  | 7,196.0 |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,535.0 |  | 403.0 | $ 15.0
Property, Plant and Equipment, Net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 69,082.0 |  | 54,560.0 |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contesting amount for filed liens in Fairfield country |  |  |  |  |  |  |  | $ 285.0 |  |  |  |  |  |  |  |  |
DESC | NND Project costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |
SCDOR | DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed assessment amount from audit |  |  |  |  |  |  |  |  | $ 410.0 |  |  |  |  |  |  |  |
Proportionate Share of NND Project |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
SOUTH CAROLINA | DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount claimed by plaintiffs in legal matter |  |  |  |  |  | $ 100.0 |  |  |  |  |  |  |  |  |  |  |
Percentage claimed by plaintiffs in legal matter |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement paid | $ 520.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,408.0 | [1] | 14.0 |
Regulatory liability |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,241.0 |  | 4,946.0 |
Asset Impairment Charges After Tax |  |  |  |  |  |  | $ 119.0 |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  | $ 160.0 |  |  |  |  |  |  | 757.0 |  |  |
Property, Plant and Equipment, Net |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,882.0 |  | $ 30,521.0 |
Litigation settlement paid |  |  |  | $ 7.0 |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 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 | Cost of Landfills and Beneficial Reuse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARO incurred |  |  |  |  |  |  |  |  |  |  |  | 2,400.0 | 131.0 |  |  |  |
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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges After Tax |  | $ 12.0 |  | 46.0 | $ 257.0 |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  | $ 17.0 |  | $ 62.0 | 346.0 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  | $ 225.0 |  |  |  |  |  |  |  |  |  |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  |  |  |  |  |  |  |  |  |  |  |  |  | 696.0 |  |  |
SCANA | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit in future electric rate relief |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.0 |  |  |
Escrow account |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.0 |  |  |
Cash payment |  |  | $ 117.0 |  |  |  |  |  |  |  |  |  |  | 115.0 |  |  |
Property, Plant and Equipment, Net |  |  | $ 54.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA | Other Receivables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivables |  |  |  |  |  |  |  |  |  |  |  |  |  | 111.0 |  |  |
SCANA | Impairment Of Assets And Other Charges [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges After Tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 480.0 |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  | 641.0 |  |  |
SCANA | Minimum | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.0 |  |  |
SCANA | Maximum | DESC Ratepayer Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85.0 |  |  |
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 | Virginia Electric and Power Company | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cubic yards of CCR required by legislation to be beneficially reused | MMcf |  |  |  |  | 6.8 |  |  |  |  |  |  | 6.8 |  |  |  |  |
Carbon Regulations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate per rear CO2 equivalent | T |  |  |  |  |  |  |  |  |  | 75,000 |  |  |  |  |  |  |
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 |  |  |  | 28.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Significant emission rate ultimate carbon cap | T |  |  |  | 19.6 |  |  |  |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | CWA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities that may be subject to final regulations | Facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation reserves |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34.0 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation reserves |  |  |  |  |  |  |  |  |  |  |  |  |  | 16.0 |  |  |
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 | SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Updated remediation work plan, cost increase |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.0 |  |  |
Unfavorable Regulatory Action | CCR | Facilities Subject to Coal Combustion Residual Final Rule | Environmental Protection Agency Final Rule Regulating Management of CCRs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities with CCR | Facility |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |
U S department of treasury [member] | FERC-regulated | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liability |  |  |  | $ 7.0 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 23 for further information.

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