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Significant Accounting Policies (Narrative) (Detail) | 1 Months Ended | 12 Months Ended |
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Nov. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | May 31, 2019 USD ($) | Mar. 31, 2019 USD ($) Facility MW | Jan. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) MWh $ / shares | Dec. 31, 2019 USD ($) MWh | Dec. 31, 2018 USD ($) $ / shares | Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued unbilled revenue |  |  |  |  |  |  | $ 1,100,000,000 |  | $ 829,000,000 |  |  |
Margin deposit assets |  |  |  |  |  |  | 19,000,000 |  | 42,000,000 |  |  |
Margin liabilities |  |  |  |  |  |  | 5,000,000 |  | 2,000,000 |  |  |
Capitalized interest costs and Capitalized interest costs and AFUDC |  |  |  |  |  |  | 103,000,000 |  | 78,000,000 |  | $ 109,000,000 |
Impairment of assets and other charges |  |  |  |  |  |  | $ 2,105,000,000 |  | $ 1,520,000,000 |  | 12,000,000 |
Finite Lived Intangible Asset Useful Life |  |  |  |  |  |  | 30 years |  |  |  |  |
Estimated proved developed or proved gas and oil reserves rate per unit | MWh |  |  |  |  |  |  | 1.97 |  | 1.80 |  |  |
Retained earnings |  |  |  |  |  |  | $ 4,189,000,000 |  | $ 7,576,000,000 |  |  |
Net unrealized gains on equity securities previously classified as cost method investments |  |  |  |  |  |  |  |  |  |  | 36,000,000 |
Net unrealized gains on equity securities previously classified as cost method investments, after tax |  |  |  |  |  |  |  |  |  |  | 22,000,000 |
Net unrealized losses in other income |  |  |  |  |  |  |  |  |  |  | 190,000,000 |
Net unrealized losses in other income, after tax |  |  |  |  |  |  |  |  |  |  | $ 142,000,000 |
Gain per share from unrealized loss on securities | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.22 |
Operating lease assets |  |  |  |  |  |  | 564,000,000 | [1] | 462,000,000 | [1] |  | $ 504,000,000
Operating lease liability |  |  |  |  |  |  | 570,000,000 |  |  |  |  |
Tax reform, reclassification of tax benefit from AOCI to retained earnings |  |  |  |  |  |  |  |  |  |  | $ 289,000,000 |
Discontinued Operations | GT&S and Q-Pipe Transactions |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease assets |  |  |  |  |  |  | 43,000,000 |  |  |  |  |
Operating lease liability |  |  |  |  |  |  | $ 43,000,000 |  |  |  |  |
Current Regulatory Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains on equity securities previously classified as cost method investments |  |  |  |  |  |  |  |  |  |  | 33,000,000 |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains on equity securities previously classified as cost method investments |  |  |  |  |  |  |  |  |  |  | 3,000,000 |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  |  |  |  |  | true |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  |  |  |  |  | Jan. 01, 2018 |  |  |  |  |
Accounting Standards Update 2014-09 | Cumulative-effect of Changes in Accounting Principles |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  | 3,000,000 |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  |  |  |  |  | true |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  |  |  |  |  | Jan. 01, 2018 |  |  |  |  |
Accounting Standards Update 2016-13 | Cumulative-effect of Changes in Accounting Principles |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains reclassified from AOCI to retained earnings |  |  |  |  |  |  |  |  |  |  | 1,100,000,000 |
Unrealized gains reclassified from AOCI to retained earnings after-tax |  |  |  |  |  |  |  |  |  |  | $ 734,000,000 |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  |  |  |  |  | true |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  |  |  |  |  | Jan. 01, 2019 |  |  |  |  |
Accounting Standards Update 2017-05 |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  |  |  |  |  | true |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  |  |  |  |  | Jan. 01, 2018 |  |  |  |  |
Accounting Standards Update 2017-05 | Cumulative-effect of Changes in Accounting Principles |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | 127,000,000
Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  |  |  |  |  | true |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  |  |  |  |  | Jan. 01, 2018 |  |  |  |  |
Change in Depreciation Rates from New Depreciation Study |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in EPS | $ / shares |  |  |  |  |  |  | $ 0.03 |  |  |  | $ 0.07 |
Change in Depreciation Rates from New Depreciation Study | Merchant generation assets |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in depreciation expense |  |  |  |  |  |  |  |  |  |  | $ (30,000,000) |
Increase (decrease) in depreciation expense, after tax |  |  |  |  |  |  |  |  |  |  | (23,000,000) |
Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  | $ 26,000,000 |  |  |  |  |  |  |  |  |
Asset impairment charges after tax |  |  | 19,000,000 |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lessee Operating Lease Renewal Term |  |  |  |  |  |  | 70 years |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lessee Operating Lease Renewal Term |  |  |  |  |  |  | 1 year |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued unbilled revenue |  |  |  |  |  |  | $ 740,000,000 |  | 512,000,000 |  |  |
Percentage of fuel currently subject to deferred fuel accounting |  |  |  |  |  |  | 85.00% |  |  |  |  |
Margin deposit assets |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |
Margin liabilities |  |  |  |  |  |  | 0 |  | 0 |  |  |
Capitalized interest costs and Capitalized interest costs and AFUDC |  |  |  |  |  |  | 60,000,000 |  | 34,000,000 |  | 56,000,000 |
AFUDC recorded as regulatory asset |  |  |  |  |  |  | 11,000,000 |  | 11,000,000 |  | 4,000,000 |
Impairment of assets and other charges |  |  |  |  |  |  | 1,093,000,000 |  | 757,000,000 |  |  |
MW Capacity | MW |  |  |  |  | 1,292 |  |  |  |  |  |  |
Number of facilities in cold reserve units retired | Facility |  |  |  |  | 6 |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  | 7,758,000,000 |  | 7,167,000,000 |  |  |
Net unrealized losses in other income |  |  |  |  |  |  |  |  |  |  | 24,000,000 |
Net unrealized losses in other income, after tax |  |  |  |  |  |  |  |  |  |  | 18,000,000 |
Operating lease assets |  |  |  |  |  |  | 185,000,000 | [1] | 212,000,000 | [1] |  | $ 209,000,000
Operating lease liability |  |  |  |  |  |  | 183,000,000 |  |  |  |  |
Tax reform, reclassification of tax benefit from AOCI to retained earnings |  |  |  |  |  |  |  |  |  |  | 3,000,000 |
Virginia Electric and Power Company | Accounting Standards Update 2016-13 | Cumulative-effect of Changes in Accounting Principles |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains reclassified from AOCI to retained earnings |  |  |  |  |  |  |  |  |  |  | 119,000,000 |
Unrealized gains reclassified from AOCI to retained earnings after-tax |  |  |  |  |  |  |  |  |  |  | 73,000,000 |
Virginia Electric and Power Company | Change in Depreciation Rates from New Depreciation Study |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in depreciation expense |  |  |  |  |  |  | (31,000,000) |  |  |  | (60,000,000) |
Increase (decrease) in depreciation expense, after tax |  |  |  |  |  |  | (23,000,000) |  |  |  | $ (44,000,000) |
Virginia Electric and Power Company | Electric Generation Facilities |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges recorded with dismantling |  |  |  |  |  |  | 54,000,000 |  |  |  |  |
Charges recorded with dismantling after tax |  |  |  |  |  |  | 40,000,000 |  |  |  |  |
Virginia Electric and Power Company | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges | $ 127,000,000 | $ 751,000,000 | 17,000,000 | $ 62,000,000 | $ 346,000,000 | $ 160,000,000 | 130,000,000 |  |  |  |  |
Asset impairment charges after tax | $ 94,000,000 | $ 559,000,000 | $ 12,000,000 | $ 46,000,000 | $ 257,000,000 | $ 119,000,000 | 97,000,000 |  |  |  |  |
Virginia Electric and Power Company | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Margin deposit assets |  |  |  |  |  |  |  |  | 1,000,000 |  |  |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax payable |  |  |  |  |  |  | 19,000,000 |  | 35,000,000 |  |  |
Virginia Electric and Power Company | Affiliated Entity | Federal |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax payable |  |  |  |  |  |  | 17,000,000 |  | 15,000,000 |  |  |
Virginia Electric and Power Company | Affiliated Entity | State |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax payable |  |  |  |  |  |  | $ 2,000,000 |  | 20,000,000 |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fuel currently subject to deferred fuel accounting |  |  |  |  |  |  | 96.00% |  |  |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inventory under LIFO method |  |  |  |  |  |  | $ 2,000,000 |  | 19,000,000 |  |  |
Amount exceeded on LIFO basis |  |  |  |  |  |  | $ 52,000,000 |  | $ 60,000,000 |  |  |
Dominion Energy Midstream Partners, LP | Terra Nova Renewable Partners | Nonregulated Solar Projects | Call Option |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership in total units |  |  |  |  |  |  | 67.00% |  |  |  |  |
Cove Point | Brookfield |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  |  |  |  |  |  | 25.00% |  |  |  |  |
Four Brothers and Three Cedars |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  | 50.00% |  |  |  |  |
Four Brothers and Three Cedars | Dominion Energy Midstream Partners, LP | Terra Nova Renewable Partners | Nonregulated Solar Projects |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  |  |  |  |  |  | 33.00% |  |  |  |  |
[1] | Included in other deferred charges and other assets in the Companies’ Consolidated Balance Sheets.

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