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Income Taxes (Income Tax Expense for Continuing Operations Including Noncontrolling Interests) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current: |  |  |  |
Federal |  | $ (45) | $ (1) | $ (155)
State |  | 108 | (26) | 85
Total current expense (benefit) |  | 63 | (27) | (70)
Deferred: |  |  |  |
2017 Tax Reform Act impact | $ (851) | 46 | (851) | 0
Taxes before operating loss carryforwards and investment tax credits |  | 436 | 739 | 1,050
Tax utilization expense (benefit) of operating loss carryforwards |  | 92 | 174 | (161)
Investment tax credits |  | (56) | (200) | (248)
State |  | (1) | 132 | 50
Total deferred expense (benefit) |  | 517 | (6) | 691
Investment tax credit-gross deferral |  | 2 | 5 | 35
Investment tax credit-amortization |  | (2) | (2) | (1)
Total income tax expense (benefit) |  | 580 | (30) | 655
Virginia Electric and Power Company |  |  |  |
Current: |  |  |  |
Federal |  | 36 | 432 | 168
State |  | 40 | 73 | 90
Total current expense (benefit) |  | 76 | 505 | 258
Deferred: |  |  |  |
2017 Tax Reform Act impact | (93) | 21 | (93) | 0
Taxes before operating loss carryforwards and investment tax credits |  | 199 | 319 | 435
Tax utilization expense (benefit) of operating loss carryforwards |  | 0 | 4 | (2)
Investment tax credits |  | (51) | (23) | (25)
State |  | 55 | 59 | 27
Total deferred expense (benefit) |  | 224 | 266 | 435
Investment tax credit-gross deferral |  | 2 | 5 | 35
Investment tax credit-amortization |  | (2) | (2) | (1)
Total income tax expense (benefit) |  | 300 | 774 | 727
Dominion Energy Gas Holdings, LLC |  |  |  |
Current: |  |  |  |
Federal |  | 23 | 16 | (27)
State |  | 30 | 8 | 4
Total current expense (benefit) |  | 53 | 24 | (23)
Deferred: |  |  |  |
2017 Tax Reform Act impact | $ (197) | (11) | (197) | 0
Taxes before operating loss carryforwards and investment tax credits |  | 48 | 199 | 239
Tax utilization expense (benefit) of operating loss carryforwards |  | 0 | 5 | (2)
Investment tax credits |  | 0 | 0 | 0
State |  | (4) | 20 | 1
Total deferred expense (benefit) |  | 33 | 27 | 238
Investment tax credit-gross deferral |  | 0 | 0 | 0
Investment tax credit-amortization |  | 0 | 0 | 0
Total income tax expense (benefit) |  | $ 86 | $ 51 | $ 215

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