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Income Taxes (Income Tax Expense for Continuing Operations Including Noncontrolling Interests) (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current: |  |  |  |
Federal |  | $ (314) | $ (94) | $ 294
State |  | (81) | 58 | 82
Total current expense (benefit) |  | (395) | (36) | 376
Deferred: |  |  |  |
Taxes before operating loss carryforwards, investment tax credits and tax reform |  | 12 | 168 | 30
2017 Tax Reform Act |  | 0 | 0 | 46
Tax utilization expense of operating loss carryforwards |  | 44 | 119 | 92
Investment tax credits |  | 311 | (51) | (56)
State |  | 72 | (50) | 34
Total deferred expense (benefit) |  | 439 | 186 | 146
Investment tax credit-gross deferral |  | 42 | 62 | 2
Investment tax credit-amortization |  | (3) | (3) | (2)
Total income tax expense | $ 336 | 83 | 209 | 522
Virginia Electric and Power Company |  |  |  |
Current: |  |  |  |
Federal |  | 364 | 286 | 36
State |  | 71 | 58 | 40
Total current expense (benefit) |  | 435 | 344 | 76
Deferred: |  |  |  |
Taxes before operating loss carryforwards, investment tax credits and tax reform |  | (226) | (128) | 199
2017 Tax Reform Act |  | 0 | 0 | 21
Tax utilization expense of operating loss carryforwards |  | 0 | 0 | 0
Investment tax credits |  | (27) | (34) | (51)
State |  | 7 | 22 | 55
Total deferred expense (benefit) |  | (246) | (140) | 224
Investment tax credit-gross deferral |  | 42 | 62 | 2
Investment tax credit-amortization |  | (2) | (2) | (2)
Total income tax expense |  | $ 229 | $ 264 | $ 300

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