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Income Taxes (Schedule of Deferred Income Taxes) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Deferred income taxes: |  |
Total deferred income tax assets | $ 2,150 | $ 2,960
Total deferred income tax liabilities | 8,761 | 7,981
Total net deferred income tax liabilities | 6,611 | 5,021
Depreciation method and plant basis differences | 4,588 | 4,449
Excess deferred income taxes | (811) | (847)
Unrecovered nuclear plant cost | 450 | 479
DESC rate refund | (67) | (89)
Toshiba Settlement | (147) | (162)
Nuclear decommissioning | 1,109 | 1,001
Deferred state income taxes | 975 | 786
Federal benefit of deferred state income taxes | (220) | (160)
Deferred fuel, purchased energy and gas costs | 299 | 509
Pension benefits | 324 | 330
Other postretirement benefits | 116 | 58
Loss and credit carryforwards | (1,022) | (1,782)
Deferred unamortized investment tax credits | (257) | (265)
Valuation allowances | 130 | 137
Partnership basis differences | 70 | 466
Total deferred taxes on stock held for sale | 804 | 0
Other | 270 | 111
Total net deferred income tax liabilities | 6,611 | 5,021
Virginia Electric and Power Company |  |
Deferred income taxes: |  |
Total deferred income tax assets | 1,281 | 1,695
Total deferred income tax liabilities | 4,905 | 4,760
Total net deferred income tax liabilities | 3,624 | 3,065
Depreciation method and plant basis differences | 3,588 | 3,437
Excess deferred income taxes | (600) | (616)
Nuclear decommissioning | 332 | 311
Deferred state income taxes | 620 | 544
Federal benefit of deferred state income taxes | (130) | (114)
Deferred fuel, purchased energy and gas costs | 267 | 403
Pension benefits | (110) | (105)
Other postretirement benefits | 125 | 111
Loss and credit carryforwards | (309) | (751)
Deferred unamortized investment tax credits | (164) | (164)
Valuation allowances | 8 | 7
Other | 3 | 2
Total net deferred income tax liabilities | $ 3,624 | $ 3,065

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