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Income Taxes (Narrative) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Aug. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jul. 31, 2023 | Dec. 31, 2021
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
State deferred income tax expense (benefit) |  |  |  | $ 60,000,000 |  | $ 277,000,000 |  | $ 59,000,000 |  |  |
Income tax expense (benefit) |  |  |  | 308,000,000 | [1] | 568,000,000 | [2] | 59,000,000 | [3] |  |
Income tax expense (benefit) from discontinued operations |  |  |  | 31,000,000 |  | 1,300,000,000 |  | 207,000,000 |  |  |
Discontinued operations, deferred tax liabilities |  | $ 939,000,000 |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  | (302,000,000) |  | 1,474,000,000 |  | 58,000,000 |  |  |
Income tax benefit associated with remeasurement of state deferred taxes |  |  |  | (40,000,000) |  | (45,000,000) |  | (35,000,000) |  |  |
Unrecognized tax benefits |  |  |  | 78,000,000 |  | 110,000,000 |  | 117,000,000 |  |  | $ 128,000,000
Unrecognized tax benefits that would impact effective tax rate |  |  |  | 30,000,000 |  | 52,000,000 |  | 64,000,000 |  |  |
Pre-tax income |  |  |  | 2,182,000,000 |  | 2,724,000,000 |  | 328,000,000 |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations |  |  |  | 38,000,000 |  |  |  |  |  |  |
Amount that earnings could potentially increase if changes were to occur |  |  |  | 30,000,000 |  |  |  |  |  |  |
Cove Point |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) from discontinued operations |  |  |  |  |  | $ 31,000,000 |  | 92,000,000 |  |  |
East Ohio, PSNC and Questar Gas |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  | (39,000,000) |  |  |  |  |  |  |
Discontinued operations, deferred tax liabilities |  |  |  | 851,000,000 |  |  |  |  |  |  |
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) |  |  |  | 60,000,000 |  | 107,000,000 |  | 108,000,000 |  |  |
Income tax expense (benefit) | [4] |  |  | 408,000,000 |  | 389,000,000 |  | 294,000,000 |  |  |
Production tax credit |  |  |  | 89,000,000 |  |  |  |  |  |  |
Deferred income taxes |  |  |  | 384,000,000 |  | 504,000,000 |  | 141,000,000 |  |  |
Income tax benefit associated with remeasurement of state deferred taxes |  |  |  | 0 |  | 0 |  | 0 |  |  |
Unrecognized tax benefits |  |  |  | 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 |  |  |  | 32,000,000 |  | 38,000,000 |  | 33,000,000 |  |  |
Discontinued Operations | East Ohio [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  | (11,000,000) |  |  |  |  |  |  |
Pre-tax income |  |  |  | 60,000,000 |  |  |  |  |  |  |
Discontinued Operations | PSNC |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  | (59,000,000) |  |  |  |  |
Pre-tax income |  |  |  |  |  | 116,000,000 |  |  |  |  |
Discontinued Operations | Questar Gas [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  | (38,000,000) |  |  |
Pre-tax income |  |  |  |  |  |  |  | 242,000,000 |  |  |
Discontinued Operations | East Ohio, PSNC and Questar Gas |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax charge |  | $ 835,000,000 |  |  |  |  |  |  |  |  |
Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  | $ (22,000,000) |  | $ (8,000,000) |  | $ (7,000,000) |  |  |
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 | BHE | Cove Point |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling limited partnership interest retained |  |  |  |  |  |  |  |  |  | 50.00% |
[1] | The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[2] | The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[3] | The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[4] | The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Virginia Power’s CODM.

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