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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |
State deferred income tax expense (benefit) |  | $ 72 | $ (50) | $ 34 |
Deferred income tax expense |  | 0 | 0 | 46 |
Current federal income taxes |  | (395) | (36) | 376 |
Taxes charged to common shareholders' equity |  |  | 215 |  |
Income tax expense | $ 336 | $ 83 | $ 209 | $ 522 |
Federal statutory income tax rate |  | 21.00% | 21.00% | 21.00% | 35.00%
Deferred income tax expense |  | $ 439 | $ 186 | $ 146 |
Increase (Decrease) to deferred income tax expense |  |  | (5) | 23 |
Increase (Decrease) in regulatory liabilities |  |  | (8) |  |
Income tax benefit associated with remeasurement of state deferred taxes |  | (44) | (119) | (92) |
Income tax expense attributable to noncontrolling interest |  | 55 |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | 140 | 141 | 37 |
Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations |  | 69 |  |  |
Amount that earnings could potentially increase if changes were to occur |  | 7 |  |  |
Virginia Electric and Power Company |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
State deferred income tax expense (benefit) |  | 7 | 22 | 55 |
Deferred income tax expense |  | 0 | 0 | 21 |
Current federal income taxes |  | 435 | 344 | 76 |
Income tax expense |  | $ 229 | $ 264 | $ 300 |
Federal statutory income tax rate |  | 21.00% | 21.00% | 21.00% |
Deferred income tax expense |  | $ (246) | $ (140) | $ 224 |
Increase (Decrease) to deferred income tax expense |  |  |  | 23 |
Increase (Decrease) in regulatory liabilities |  |  |  | 31 |
Income tax benefit associated with remeasurement of state deferred taxes |  | 0 | 0 | 0 |
Unrecognized tax benefits that would impact effective tax rate |  |  |  | 2 |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  | (2) | (2) |
Virginia Electric and Power Company | Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  | 1 |  |
SCANA |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred income tax expense |  | 194 |  |  |
Discontinued Operations |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax expense |  | (204) | 142 | 58 |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  | 5 |  |  |
Discontinued Operations | Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  | (1) | (1) |
Continuing Operations |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  | (6) | $ 3 | $ 6 |
Cove Point |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  | 25.00% |  |
Current federal income taxes |  |  | $ 362 |  |
Benefit for deferred income taxes |  |  | 147 |  |
Federal tax credits |  |  | 208 |  |
Atlantic Coast Pipeline | Discontinued Operations | Supply Header Project |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax charge |  | 81 |  |  |
Federal |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred income tax expense |  |  | $ 48 |  |
State |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax benefit associated with remeasurement of state deferred taxes |  | 45 |  |  |
GT&S Transaction |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
State deferred income tax expense (benefit) |  | 18 |  |  |
GT&S Transaction | Discontinued Operations |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax expense (benefit) on non-deductible goodwill written off |  | $ 236 |  |  |

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