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Significant Accounting Policies (Narrative) (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2022 USD ($) $ / shares | Mar. 31, 2020 USD ($) | Mar. 31, 2022 USD ($) $ / shares | Mar. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) MWh | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) MWh
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Accrued unbilled revenue |  |  |  |  | $ 1,100,000,000 | $ 779,000,000 |
Reversal of interest expense on uncertain tax positions effectively settled |  |  |  |  | 21,000,000 |  |
Reversal of penalty expense on uncertain tax positions effectively settled |  |  |  |  | 7,000,000 |  |
Margin deposit assets |  |  |  |  | 480,000,000 | 678,000,000 |
Capitalized interest costs and Capitalized interest costs and AFUDC |  |  |  |  | 112,000,000 | 117,000,000 | $ 103,000,000
Impairment of assets and other charges |  |  |  |  | $ 2,063,000,000 | 195,000,000 | $ 2,105,000,000
Finite Lived Intangible Asset Useful Life |  |  |  |  | 35 years |  |
Estimated proved developed or proved gas and oil reserves rate per unit | MWh |  |  |  |  | 1.67 |  | 1.92
Cost saving incentive |  |  |  |  | $ 27,000,000 | $ 0 | $ 0
Non-jurisdictional and Certain Nonutility Solar Generation Facilities |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite Lived Intangible Asset Useful Life | 35 years |  |  |  |  |  |
Change in Depreciation Rates from New Depreciation Study |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase in EPS | $ / shares |  |  | $ 0.05 |  |  | $ 0.03 |
Revision Of Estimated Useful Life | Non-jurisdictional and Certain Nonutility Solar Generation Facilities |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase (decrease) in depreciation expense | $ (16,000,000) |  |  |  |  |  |
Increase (decrease) in depreciation expense, after tax | $ (12,000,000) |  |  |  |  |  |
Increase in EPS | $ / shares | $ 0.02 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Lease extend term |  |  |  |  | 1 year |  |
Maximum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Lease extend term |  |  |  |  | 70 years |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Accrued unbilled revenue |  |  |  |  | $ 620,000,000 | $ 398,000,000 |
Percentage of fuel currently subject to deferred fuel accounting |  |  |  |  | 86.00% |  |
Margin deposit assets |  |  |  |  | $ 310,000,000 | 167,000,000 |
Margin liabilities |  |  |  |  | 0 | 0 |
Capitalized interest costs and Capitalized interest costs and AFUDC |  |  |  |  | 66,000,000 | 78,000,000 | 60,000,000
AFUDC recorded as regulatory asset |  |  |  |  | 34,000,000 | 35,000,000 | 11,000,000
Finite Lived Intangible Asset Useful Life | 35 years |  |  |  |  |  |
Virginia Electric and Power Company | Change in Depreciation Rates from New Depreciation Study |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase (decrease) in depreciation expense |  |  | $ 60,000,000 |  |  | (31,000,000) |
Increase (decrease) in depreciation expense, after tax |  |  | $ (45,000,000) |  |  | (23,000,000) |
Virginia Electric and Power Company | Revision Of Estimated Useful Life |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase (decrease) in depreciation expense | $ (6,000,000) |  |  |  |  |  |
Increase (decrease) in depreciation expense, after tax | $ (4,000,000) |  |  |  |  |  |
Virginia Electric and Power Company | Electric Generation Facilities |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Charges recorded with dismantling |  |  |  |  | 167,000,000 |  | 54,000,000
Charges recorded with dismantling after tax |  |  |  |  | 124,000,000 |  | 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 |  | $ 751,000,000 |  | $ 76,000,000 |  |  | 127,000,000
Asset impairment charges after tax |  | $ 559,000,000 |  | $ 56,000,000 |  |  | $ 94,000,000
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Income tax receivable |  |  |  |  |  | 35,000,000 |
Income tax payable |  |  |  |  | 22,000,000 |  |
Virginia Electric and Power Company | Affiliated Entity | Federal |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Income tax receivable |  |  |  |  |  | 33,000,000 |
Income tax payable |  |  |  |  | 25,000,000 |  |
Virginia Electric and Power Company | Affiliated Entity | State |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Income tax receivable |  |  |  |  | $ 3,000,000 | 2,000,000 |
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 |  |  |  |  | $ 14,000,000 | 26,000,000 |
Amount exceeded on LIFO basis |  |  |  |  | $ 129,000,000 | $ 74,000,000 |
Cove Point | Brookfield |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  |  |  |  | 25.00% |  |
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% |  |

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