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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |  |
Federal |  | $ (1) | $ (155) | $ (24)
State |  | (26) | 85 | 75
Total current expense (benefit) |  | (27) | (70) | 51
Deferred: |  |  |  |
Federal 2017 Tax Reform Act impact | $ (851) | (851) |  |
Taxes before operating loss carryforwards and investment tax credits |  | 739 | 1,050 | 384
Tax utilization expense (benefit) of operating loss carryforwards |  | 174 | (161) | 539
Investment tax credits |  | (200) | (248) | (134)
State |  | 132 | 50 | 66
Total deferred expense (benefit) |  | (6) | 691 | 855
Investment tax credit-gross deferral |  | 5 | 35 |
Investment tax credit-amortization |  | (2) | (1) | (1)
Total income tax expense (benefit) |  | (30) | 655 | 905
Virginia Electric and Power Company |  |  |  |
Current: |  |  |  |
Federal |  | 432 | 168 | 316
State |  | 73 | 90 | 92
Total current expense (benefit) |  | 505 | 258 | 408
Deferred: |  |  |  |
Federal 2017 Tax Reform Act impact | (93) | (93) |  |
Taxes before operating loss carryforwards and investment tax credits |  | 319 | 435 | 154
Tax utilization expense (benefit) of operating loss carryforwards |  | 4 | (2) | 96
Investment tax credits |  | (23) | (25) | (11)
State |  | 59 | 27 | 13
Total deferred expense (benefit) |  | 266 | 435 | 252
Investment tax credit-gross deferral |  | 5 | 35 |
Investment tax credit-amortization |  | (2) | (1) | (1)
Total income tax expense (benefit) |  | 774 | 727 | 659
Dominion Energy Gas Holdings, LLC |  |  |  |
Current: |  |  |  |
Federal |  | 16 | (27) | 90
State |  | 8 | 4 | 30
Total current expense (benefit) |  | 24 | (23) | 120
Deferred: |  |  |  |
Federal 2017 Tax Reform Act impact | $ (197) | (197) |  |
Taxes before operating loss carryforwards and investment tax credits |  | 199 | 239 | 156
Tax utilization expense (benefit) of operating loss carryforwards |  | 5 | (2) | 6
State |  | 20 | 1 | 1
Total deferred expense (benefit) |  | 27 | 238 | 163
Total income tax expense (benefit) |  | $ 51 | $ 215 | $ 283

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