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Income Taxes (Income Tax Expense for Continuing Operations Including Noncontrolling Interests) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current: |  |  |  |
Federal |  | $ 32 | $ (45) | $ (1)
State |  | 103 | 108 | (26)
Total current expense (benefit) |  | 135 | 63 | (27)
Deferred: |  |  |  |
2017 Tax Reform Act impact | [1] |  | 46 | (851)
Taxes before operating loss carryforwards, investment tax credits and tax reform |  | 182 | 436 | 739
Tax utilization expense (benefit) of operating loss carryforwards |  | 119 | 92 | 174
Investment tax credits |  | (51) | (56) | (200)
State |  | (93) | (1) | 132
Total deferred expense (benefit) |  | 157 | 517 | (6)
Investment tax credit-gross deferral |  | 62 | 2 | 5
Investment tax credit-amortization |  | (3) | (2) | (2)
Total income tax expense (benefit) |  | 351 | 580 | (30)
Virginia Electric and Power Company |  |  |  |
Current: |  |  |  |
Federal |  | 286 | 36 | 432
State |  | 58 | 40 | 73
Total current expense (benefit) |  | 344 | 76 | 505
Deferred: |  |  |  |
2017 Tax Reform Act impact | [1] | 0 | 21 | (93)
Taxes before operating loss carryforwards, investment tax credits and tax reform |  | (128) | 199 | 319
Tax utilization expense (benefit) of operating loss carryforwards |  | 0 | 0 | 4
Investment tax credits |  | (34) | (51) | (23)
State |  | 22 | 55 | 59
Total deferred expense (benefit) |  | (140) | 224 | 266
Investment tax credit-gross deferral |  | 62 | 2 | 5
Investment tax credit-amortization |  | (2) | (2) | (2)
Total income tax expense (benefit) |  | 264 | 300 | 774
Dominion Energy Gas Holdings, LLC |  |  |  |
Current: |  |  |  |
Federal |  | 130 | (227) | 75
State |  | 17 | 31 | 13
Total current expense (benefit) |  | 147 | (196) | 88
Deferred: |  |  |  |
2017 Tax Reform Act impact | [1] |  | (6) | (246)
Taxes before operating loss carryforwards, investment tax credits and tax reform |  | (36) | 343 | 88
Tax utilization expense (benefit) of operating loss carryforwards |  | 0 | 0 | 0
Investment tax credits |  | 0 | 0 | 0
State |  | (10) | (17) | 5
Total deferred expense (benefit) |  | (46) | 320 | (153)
Investment tax credit-gross deferral |  | 0 | 0 | 0
Investment tax credit-amortization |  | 0 | 0 | 0
Total income tax expense (benefit) |  | $ 101 | $ 124 | $ (65)
[1] | The 2017 Tax Reform Act impact for Dominion Energy Gas includes an expense of $8 million for the year ended December 31, 2018 and a benefit of $93 million for the year ended December 31, 2017 arising from discontinued operations.

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