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Income Taxes (Narrative) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Aug. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jul. 31, 2023 | Dec. 31, 2020
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
State deferred income tax expense (benefit) |  |  |  |  | $ 282,000,000 | $ 73,000,000 | $ (49,000,000) |  |
Income tax expense (benefit) |  |  |  | $ 173,000,000 | 575,000,000 | 113,000,000 | (181,000,000) |  |
Income tax expense (benefit) from discontinued operations |  |  |  |  | 1,300,000,000 | 197,000,000 | 374,000,000 |  |
Discontinued operations, deferred tax liabilities |  | $ 939,000,000 |  |  |  |  |  |  |
Deferred income tax expense (benefit) |  |  |  |  | 1,471,000,000 | 102,000,000 | 409,000,000 |  |
Income tax benefit associated with remeasurement of state deferred taxes |  |  |  |  | (45,000,000) | (35,000,000) | (42,000,000) |  |
Unrecognized tax benefits |  |  |  | 128,000,000 | 110,000,000 | 117,000,000 | 128,000,000 |  | $ 167,000,000
Unrecognized tax benefits that would impact effective tax rate |  |  |  | $ 72,000,000 | 52,000,000 | 64,000,000 | 72,000,000 |  |
Pre-tax income |  |  |  |  | 2,732,000,000 | 540,000,000 | 1,880,000,000 |  |
Maximum |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations |  |  |  |  | 27,000,000 |  |  |  |
Amount that earnings could potentially increase if changes were to occur |  |  |  |  | $ 14,000,000 |  |  |  |
Cove Point |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained | [1] |  |  |  | 50.00% |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  |  |  | $ 31,000,000 | 92,000,000 | $ 60,000,000 |  |
Four Brothers And Three Cedars |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  | 50.00% | 50.00% |  | 50.00% |  |
East Ohio, PSNC and Questar Gas |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Discontinued operations, deferred tax liabilities |  | $ 825,000,000 |  |  |  |  |  |  |
East Ohio, PSNC and Questar Gas | Cove Point |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  | 50.00% |  |  | 50.00% |  |  |  |
Income tax expense (benefit) |  |  |  |  | $ 29,000,000 |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
State deferred income tax expense (benefit) |  |  |  |  | 107,000,000 | 108,000,000 | $ 116,000,000 |  |
Income tax expense (benefit) |  |  |  |  | 389,000,000 | 294,000,000 | 447,000,000 |  |
Deferred income tax expense (benefit) |  |  |  |  | 504,000,000 | 141,000,000 | 207,000,000 |  |
Income tax benefit associated with remeasurement of state deferred taxes |  |  |  |  | 0 | 0 | 0 |  |
Unrecognized tax benefits |  |  |  | $ 0 | 0 | 0 | 0 |  |
Hope Gas Inc [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  | 34,000,000 |  |  |
Percentage of equity interests sold |  |  | 100.00% |  |  |  |  |  |
Discontinued Operations |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  |  | $ 33,000,000 | 38,000,000 | 33,000,000 | 33,000,000 |  |
Discontinued Operations | East Ohio [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax income |  |  |  |  | 104,000,000 |  |  |  |
Discontinued Operations | PSNC |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  | (59,000,000) | (38,000,000) |  |  |
Pre-tax income |  |  |  |  |  | 233,000,000 |  |  |
Discontinued Operations | Questar Gas [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  | (37,000,000) |  |
Pre-tax income |  |  |  |  |  |  | 218,000,000 |  |
Discontinued Operations | East Ohio, PSNC and Questar Gas |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax charge |  | $ 886,000,000 |  |  |  |  |  |  |
Continuing Operations |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  |  | $ (8,000,000) | (7,000,000) | (34,000,000) |  |
Deferred income tax expense (benefit) |  |  |  |  |  | (21,000,000) |  |  |
Continuing Operations | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred income tax expense (benefit) |  |  |  |  |  | $ (16,000,000) |  |  |
Continuing Operations | SCANA |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  |  |  |  | 38,000,000 |  |
SBL Holdco |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  | 196,000,000 |  |
BHE | East Ohio, PSNC and Questar Gas | Cove Point |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) from discontinued operations |  | $ 278,000,000 |  |  |  |  |  |  |
IRA |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Percentage of alternate minimum tax on GAAP net income |  |  | 15.00% |  |  |  |  |  |
IRA | Minimum |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax credit expiration year |  |  | 2032 |  |  |  |  |  |
Annual financial statement income for tax years |  |  | $ 1,000,000,000 |  |  |  |  |  |
GT&S Transaction |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  |  |  |  |  | 19,000,000 |  |
GT&S Transaction | Cove Point |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  |  | 50.00% |  |  |
GT&S Transaction | Discontinued Operations |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit related to finalizing income tax returns |  |  |  |  |  |  | (14,000,000) |  |
GT&S Transaction | BHE | Cove Point |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  |  |  |  | 50.00% |
Q-Pipe Group | Discontinued Operations |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) on non-deductible goodwill written off |  |  |  |  |  |  | $ 36,000,000 |  |
[1] | Dominion Energy’s sold its remaining 50% noncontrolling limited partnership interest in September 2023. See discussion below. Presented in noncurrent assets held for sale in Dominion Energy’s Consolidated Balance Sheets at December 31, 2022.

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