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Significant Accounting Policies (Narrative) (Detail) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 Facility MW | Jan. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | $ 531 | $ 312 |  | $ 1,299 | $ 1,147 |  |  |
Increase to nuclear decommissioning asset retirement obligation |  |  |  | 89 |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | $ 67,980 |  |  | $ 67,980 |  |  | $ 69,082 | [1]
Change In Depreciation Rates From New Depreciation Study |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in EPS | $ / shares |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  |  |
Change In Depreciation Rates From New Depreciation Study | Merchant generation assets | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in EPS | $ / shares |  |  |  |  |  |  |  |  | $ 0.03 |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | $ 482 | 13 |  | $ 482 | 13 |  |  |
Property, plant and equipment |  |  |  | 11,204 |  |  | 11,204 |  |  | 11,628 | [2]
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | 44 | 197 |  | 808 | $ 743 |  |  |
MW Capacity | MW |  | 1,292 |  |  |  |  |  |  |  |  |
Number of facilities in cold reserve units retired | Facility |  | 6 |  |  |  |  |  |  |  |  |
Asset retirement obligations |  |  |  | 91 |  |  | 91 |  |  | 340 | [3]
Property, plant and equipment |  |  |  | 31,499 |  |  | 31,499 |  |  | $ 32,882 | [3]
Virginia Electric and Power Company | Change In Depreciation Rates From New Depreciation Study |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in depreciation expense |  |  |  | (8) |  |  | (16) |  |  |  |
Increase (decrease) in depreciation expense, after tax |  |  |  | (6) |  |  | (12) |  |  |  |
Virginia Electric and Power Company | Change In Depreciation Rates From New Depreciation Study | Merchant generation assets | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in depreciation expense |  |  |  |  |  |  |  |  | $ (31) |  |
Increase (decrease) in depreciation expense, after tax |  |  |  |  |  |  |  |  | $ (23) |  |
Virginia Electric and Power Company | Electric Generation Facilities |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Charges recorded with dismantling |  |  |  | 30 |  |  |  |  |  |  |
Charges recorded with dismantling after tax |  |  |  | 22 |  |  |  |  |  |  |
Virginia Electric and Power Company | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges | $ 754 |  | $ 160 |  | 62 | $ 369 |  |  |  |  |
Asset impairment charges after tax | $ 561 |  | $ 119 |  | $ 46 | $ 275 |  |  |  |  |
DETI |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  | 482 |  |  |  |
Asset impairment charges after tax |  |  |  |  |  |  | 359 |  |  |  |
Asset retirement obligations |  |  |  | 75 |  |  | 75 |  |  |  |
Property, plant and equipment |  |  |  | $ 40 |  |  | $ 40 |  |  |  |
Dominion Energy Midstream Partners, LP | Terra Nova Renewable Partners | Merchant Solar Projects | Call Option |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage ownership in total units |  |  |  | 67.00% |  |  | 67.00% |  |  |  |
Cove Point |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage ownership in total units |  |  |  |  |  |  |  |  |  | 75.00% |
Cove Point | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  |  |  | 25.00% |  |  | 25.00% |  |  |  |
Four Brothers and Three Cedars |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 50.00% |  |  | 50.00% |  |  |  |
Four Brothers and Three Cedars | Dominion Energy Midstream Partners, LP | Terra Nova Renewable Partners | Merchant Solar Projects |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  |  |  | 33.00% |  |  | 33.00% |  |  |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | 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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