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Income Taxes (Schedule of Deferred Income Taxes) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Deferred income taxes: |  |
Total deferred income tax assets | $ 2,686 | $ 1,827
Total deferred income tax liabilities | 7,158 | 10,381
Total net deferred income tax liabilities | 4,472 | 8,554
Plant and equipment, primarily depreciation method and basis differences | 5,056 | 7,782
Excess deferred income taxes | (1,050) |
Nuclear decommissioning | 829 | 1,240
Deferred state income taxes | 834 | 747
Federal benefit of deferred state income taxes | (175) | (261)
Deferred fuel, purchased energy and gas costs | 1 | (25)
Pension benefits | 141 | 155
Other postretirement benefits | (51) | (68)
Loss and credit carryforwards | (1,536) | (1,547)
Valuation allowances | 146 | 135
Partnership basis differences | 473 | 688
Other | (196) | (292)
Total net deferred income tax liabilities | 4,472 | 8,554
Deferred Investment Tax Credits - Regulated Operations | 51 | 48
Total Deferred Taxes and Deferred Investment Tax Credits | 4,523 | 8,602
Virginia Electric and Power Company |  |
Deferred income taxes: |  |
Total deferred income tax assets | 923 | 268
Total deferred income tax liabilities | 3,600 | 5,323
Total net deferred income tax liabilities | 2,677 | 5,055
Plant and equipment, primarily depreciation method and basis differences | 2,969 | 4,604
Excess deferred income taxes | (687) |
Nuclear decommissioning | 260 | 406
Deferred state income taxes | 378 | 321
Federal benefit of deferred state income taxes | (79) | (112)
Deferred fuel, purchased energy and gas costs | (3) | (29)
Pension benefits | (104) | (138)
Other postretirement benefits | 44 | 49
Loss and credit carryforwards | (111) | (88)
Valuation allowances | 5 | 3
Other | 5 | 39
Total net deferred income tax liabilities | 2,677 | 5,055
Deferred Investment Tax Credits - Regulated Operations | 51 | 48
Total Deferred Taxes and Deferred Investment Tax Credits | 2,728 | 5,103
Dominion Energy Gas Holdings, LLC |  |
Deferred income taxes: |  |
Total deferred income tax assets | 320 | 126
Total deferred income tax liabilities | 1,774 | 2,564
Total net deferred income tax liabilities | 1,454 | 2,438
Plant and equipment, primarily depreciation method and basis differences | 1,132 | 1,726
Excess deferred income taxes | (244) |
Deferred state income taxes | 227 | 204
Federal benefit of deferred state income taxes | (48) | (71)
Deferred fuel, purchased energy and gas costs | 2 | 4
Pension benefits | 419 | 646
Other postretirement benefits | (2) | (6)
Loss and credit carryforwards | (4) | (5)
Valuation allowances | 3 |
Partnership basis differences | 26 | 43
Other | (57) | (103)
Total net deferred income tax liabilities | 1,454 | 2,438
Total Deferred Taxes and Deferred Investment Tax Credits | $ 1,454 | $ 2,438

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