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Income Taxes (Income Tax Expense for Continuing Operations Including Noncontrolling Interests) (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Current: |  |  |  |  |
Federal |  |  | $ (76) | $ (301) | $ (388)
State |  |  | 27 | 13 | (91)
Total current expense (benefit) |  |  | (49) | (288) | (479)
Deferred: |  |  |  |  |
Taxes before operating loss carryforwards and investment tax credits |  |  | (63) | 144 | (16)
Tax utilization expense of operating loss carryforwards |  |  | 35 | 42 | 42
Investment tax credits |  |  | (129) | 250 | 311
State |  |  | 44 | (26) | 44
Total deferred expense (benefit) |  |  | (113) | 410 | 381
Investment tax credit-gross deferral |  |  | 18 | 121 | 42
Investment tax credit-amortization |  |  | (4) | (4) | (3)
Total income tax expense (benefit) | $ 336 | $ 173 | (148) | 239 | (59)
Virginia Electric and Power Company |  |  |  |  |
Current: |  |  |  |  |
Federal |  |  | 17 | 67 | 364
State |  |  | (17) | (13) | 71
Total current expense (benefit) |  |  | 0 | 54 | 435
Deferred: |  |  |  |  |
Taxes before operating loss carryforwards and investment tax credits |  |  | 212 | 145 | (226)
Tax utilization expense of operating loss carryforwards |  |  | 0 | 0 | 0
Investment tax credits |  |  | (148) | (39) | (27)
State |  |  | 112 | 118 | 7
Total deferred expense (benefit) |  |  | 176 | 224 | (246)
Investment tax credit-gross deferral |  |  | 18 | 121 | 42
Investment tax credit-amortization |  |  | (3) | (2) | (2)
Total income tax expense (benefit) |  |  | $ 191 | $ 397 | $ 229

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