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Income Taxes (Schedule of Deferred Income Taxes) (Detail) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Deferred income taxes: |  |
Total deferred income tax assets | $ 3,736,000,000 | $ 2,748,000,000
Total deferred income tax liabilities | 9,883,000,000 | 7,813,000,000
Total net deferred income tax liabilities | 6,147,000,000 | 5,065,000,000
Plant and equipment, primarily depreciation method and basis differences | 6,616,000,000 | 4,933,000,000
Excess deferred income taxes | (1,306,000,000) | (993,000,000)
Unrecovered NND Project costs | 553 | 0
DESC rate refund | (169) | 0
Toshiba Settlement | (219) | 0
Nuclear decommissioning | 909,000,000 | 815,000,000
Deferred state income taxes | 863,000,000 | 626,000,000
Federal benefit of deferred state income taxes | (184,000,000) | (132,000,000)
Deferred fuel, purchased energy and gas costs | 30,000,000 | 60,000,000
Pension benefits | 174,000,000 | 81,000,000
Other postretirement benefits | (37,000,000) | (5,000,000)
Loss and credit carryforwards | (1,832,000,000) | (1,546,000,000)
Valuation allowances | 161,000,000 | 158,000,000
Partnership basis differences | 823,000,000 | 1,135,000,000
Other | (235,000,000) | (67,000,000)
Total net deferred income tax liabilities | 6,147,000,000 | 5,065,000,000
Deferred Investment Tax Credits - Regulated Operations | 130,000,000 | 51,000,000
Total Deferred Taxes and Deferred Investment Tax Credits | 6,277,000,000 | 5,116,000,000
Virginia Electric and Power Company |  |
Deferred income taxes: |  |
Total deferred income tax assets | 1,207,000,000 | 1,054,000,000
Total deferred income tax liabilities | 4,058,000,000 | 4,020,000,000
Total net deferred income tax liabilities | 2,851,000,000 | 2,966,000,000
Plant and equipment, primarily depreciation method and basis differences | 3,359,000,000 | 3,367,000,000
Excess deferred income taxes | (672,000,000) | (678,000,000)
Unrecovered NND Project costs | 0 | 0
DESC rate refund | 0 | 0
Toshiba Settlement | 0 | 0
Nuclear decommissioning | 290,000,000 | 273,000,000
Deferred state income taxes | 302,000,000 | 284,000,000
Federal benefit of deferred state income taxes | (63,000,000) | (60,000,000)
Deferred fuel, purchased energy and gas costs | 1,000,000 | 59,000,000
Pension benefits | (153,000,000) | (132,000,000)
Other postretirement benefits | 62,000,000 | 55,000,000
Loss and credit carryforwards | (280,000,000) | (183,000,000)
Valuation allowances | 5,000,000 | 5,000,000
Partnership basis differences | 0 | 0
Other | 0 | (24,000,000)
Total net deferred income tax liabilities | 2,851,000,000 | 2,966,000,000
Deferred Investment Tax Credits - Regulated Operations | 111,000,000 | 51,000,000
Total Deferred Taxes and Deferred Investment Tax Credits | 2,962,000,000 | 3,017,000,000
Dominion Energy Gas Holdings, LLC |  |
Deferred income taxes: |  |
Total deferred income tax assets | 206,000,000 | 296,000,000
Total deferred income tax liabilities | 1,494,000,000 | 1,626,000,000
Total net deferred income tax liabilities | 1,288,000,000 | 1,330,000,000
Plant and equipment, primarily depreciation method and basis differences | 742,000,000 | 671,000,000
Excess deferred income taxes | (149,000,000) | (156,000,000)
Unrecovered NND Project costs | 0 | 0
DESC rate refund | 0 | 0
Toshiba Settlement | 0 | 0
Nuclear decommissioning | 0 | 0
Deferred state income taxes | 199,000,000 | 203,000,000
Federal benefit of deferred state income taxes | (42,000,000) | (43,000,000)
Deferred fuel, purchased energy and gas costs | 0 | (1,000,000)
Pension benefits | 154,000,000 | 134,000,000
Other postretirement benefits | (6,000,000) | (3,000,000)
Loss and credit carryforwards | (1,000,000) | (5,000,000)
Valuation allowances | 1,000,000 | 6,000,000
Partnership basis differences | 423,000,000 | 570,000,000
Other | (33,000,000) | (46,000,000)
Total net deferred income tax liabilities | 1,288,000,000 | 1,330,000,000
Deferred Investment Tax Credits - Regulated Operations | 0 | 0
Total Deferred Taxes and Deferred Investment Tax Credits | $ 1,288,000,000 | $ 1,330,000,000

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