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Income Taxes (Narrative) (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2020 | Aug. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |  |  |  |  |
Percentage of interest expense adjusted to taxable income |  |  |  | 30.00% |  |  |
State deferred income tax expense (benefit) |  |  |  | $ 32,000,000 | $ (19,000,000) | $ 72,000,000 |
Income tax expense | $ 336,000,000 |  | $ 173,000,000 | 68,000,000 | 425,000,000 | 83,000,000 |
Income tax expense (benefit) from discontinued operations |  |  |  | 8,000,000 | 188,000,000 | (204,000,000) |
Deferred income tax expense (benefit) |  |  |  | 1,000,000 | 425,000,000 | 439,000,000 |
Income tax benefit associated with remeasurement of state deferred taxes |  |  |  | (36,000,000) | (43,000,000) | (44,000,000) |
Income tax expense attributable to noncontrolling interest |  |  |  |  |  | 55,000,000 |
Unrecognized tax benefits |  |  | 128,000,000 | 117,000,000 | 128,000,000 | 167,000,000 | $ 175,000,000
Unrecognized tax benefits that would impact effective tax rate |  |  | 72,000,000 | 64,000,000 | 72,000,000 | 140,000,000 |
Maximum |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations |  |  |  | 39,000,000 |  |  |
Amount that earnings could potentially increase if changes were to occur |  |  |  | 26,000,000 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
State deferred income tax expense (benefit) |  |  |  | 112,000,000 | 118,000,000 | 7,000,000 |
Income tax expense |  |  |  | 191,000,000 | 397,000,000 | 229,000,000 |
Deferred income tax expense (benefit) |  |  |  | 176,000,000 | 224,000,000 | (246,000,000) |
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 |  |  |  | $ 34,000,000 |  |  |
Percentage of equity interests sold |  |  |  | 100.00% |  |  |
Discontinued Operations |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  |  |  | 5,000,000 |
Unrecognized tax benefits that would impact effective tax rate |  |  | $ 33,000,000 | $ 33,000,000 | 33,000,000 |  |
Continuing Operations |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  | $ (7,000,000) | (34,000,000) | (6,000,000) |
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) |  |
Atlantic Coast Pipeline | Discontinued Operations | Supply Header Project |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Income tax charge |  |  |  |  |  | 81,000,000 |
State |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Income tax benefit associated with remeasurement of state deferred taxes |  |  |  |  |  | 45,000,000 |
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] |  |  |  |  |  |  |
State deferred income tax expense (benefit) |  |  |  |  |  | 18,000,000 |
Income tax expense (benefit) from discontinued operations |  |  |  |  | (17,000,000) |  |
GT&S Transaction | Discontinued Operations |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Income tax benefit related to finalizing income tax returns |  |  |  |  | (14,000,000) |  |
Income tax expense (benefit) on non-deductible goodwill written off |  |  |  |  |  | $ 236,000,000 |
Q-Pipe Group | Discontinued Operations |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) on non-deductible goodwill written off |  |  |  |  | $ 36,000,000 |  |

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