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Income Taxes (Schedule of Deferred Income Taxes) (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Deferred income taxes: |  |
Total deferred income tax assets | $ 2,748 | $ 2,686
Total deferred income tax liabilities | 7,813 | 7,158
Plant and equipment, primarily depreciation method and basis differences | 4,933 | 5,056
Excess deferred income taxes | (993) | (1,050)
Nuclear decommissioning | 815 | 829
Deferred state income taxes | 626 | 834
Federal benefit of deferred state income taxes | (132) | (175)
Deferred fuel, purchased energy and gas costs | 60 | 1
Pension benefits | 81 | 141
Other postretirement benefits | (5) | (51)
Loss and credit carryforwards | (1,546) | (1,536)
Valuation allowances | 158 | 146
Partnership basis differences | 1,135 | 473
Other | (67) | (196)
Total net deferred income tax liabilities | 5,065 | 4,472
Deferred Investment Tax Credits - Regulated Operations | 51 | 51
Total Deferred Taxes and Deferred Investment Tax Credits | 5,116 | 4,523
Virginia Electric and Power Company |  |
Deferred income taxes: |  |
Total deferred income tax assets | 1,054 | 923
Total deferred income tax liabilities | 4,020 | 3,600
Plant and equipment, primarily depreciation method and basis differences | 3,367 | 2,969
Excess deferred income taxes | (678) | (687)
Nuclear decommissioning | 273 | 260
Deferred state income taxes | 284 | 378
Federal benefit of deferred state income taxes | (60) | (79)
Deferred fuel, purchased energy and gas costs | 59 | (3)
Pension benefits | (132) | (104)
Other postretirement benefits | 55 | 44
Loss and credit carryforwards | (183) | (111)
Valuation allowances | 5 | 5
Other | (24) | 5
Total net deferred income tax liabilities | 2,966 | 2,677
Deferred Investment Tax Credits - Regulated Operations | 51 | 51
Total Deferred Taxes and Deferred Investment Tax Credits | 3,017 | 2,728
Dominion Energy Gas Holdings, LLC |  |
Deferred income taxes: |  |
Total deferred income tax assets | 296 | 293
Total deferred income tax liabilities | 1,626 | 1,299
Plant and equipment, primarily depreciation method and basis differences | 671 | 645
Excess deferred income taxes | (156) | (155)
Deferred state income taxes | 203 | 258
Federal benefit of deferred state income taxes | (43) | (51)
Deferred fuel, purchased energy and gas costs | (1) |
Pension benefits | 134 | 139
Other postretirement benefits | (3) | (3)
Loss and credit carryforwards | (5) | (5)
Valuation allowances | 6 | 4
Partnership basis differences | 570 | 220
Other | (46) | (46)
Total net deferred income tax liabilities | 1,330 | 1,006
Total Deferred Taxes and Deferred Investment Tax Credits | $ 1,330 | $ 1,006

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