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Income Taxes (Schedule of Deferred Income Taxes) (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Deferred income taxes: |  |
Total deferred income tax assets | $ 1,854 | $ 2,150
Total deferred income tax liabilities | 8,266 | 8,771
Total net deferred income tax liabilities | 6,412 | 6,621
Depreciation method and plant basis differences | 4,878 | 4,588
Excess deferred income taxes | (790) | (811)
Unrecovered nuclear plant cost | 420 | 450
DESC rate refund | (49) | (67)
Toshiba Settlement | (133) | (147)
Nuclear decommissioning | 1,232 | 1,109
Deferred state income taxes | 1,046 | 976
Federal benefit of deferred state income taxes | (230) | (220)
Deferred fuel, purchased energy and gas costs | 189 | 299
Pension benefits | 345 | 324
Other postretirement benefits | 174 | 116
Loss and credit carryforwards | (680) | (1,022)
Deferred unamortized investment tax credits | (250) | (257)
Valuation allowances | 113 | 130
Partnership basis differences | (30) | 70
Total deferred taxes on stock held for sale | 0 | 814
Other | 177 | 269
Total net deferred income tax liabilities | 6,412 | 6,621
Virginia Electric and Power Company |  |
Deferred income taxes: |  |
Total deferred income tax assets | 1,082 | 1,281
Total deferred income tax liabilities | 5,127 | 4,905
Total net deferred income tax liabilities | 4,045 | 3,624
Depreciation method and plant basis differences | 3,765 | 3,588
Excess deferred income taxes | (587) | (600)
Nuclear decommissioning | 357 | 332
Deferred state income taxes | 676 | 620
Federal benefit of deferred state income taxes | (142) | (130)
Deferred fuel, purchased energy and gas costs | 178 | 267
Pension benefits | (116) | (110)
Other postretirement benefits | 141 | 125
Loss and credit carryforwards | 0 | (309)
Deferred unamortized investment tax credits | (159) | (164)
Valuation allowances | 0 | 8
Partnership basis differences | (98) | 0
Other | 30 | (3)
Total net deferred income tax liabilities | $ 4,045 | $ 3,624

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