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Income Taxes (Schedule of Deferred Income Taxes) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Deferred income taxes: |  |
Total deferred income tax assets | $ 2,869 | $ 3,025
Total deferred income tax liabilities | 9,267 | 9,397
Total net deferred income tax liabilities | 6,398 | 6,372
Plant and equipment, primarily depreciation method and basis differences | 5,545 | 6,017
Excess deferred income taxes | (1,060) | (1,107)
Unrecovered NND Project costs | 479 | 508
DESC rate refund | (89) | (113)
Toshiba Settlement | (162) | (189)
Nuclear decommissioning | 1,001 | 1,114
Deferred state income taxes | 892 | 857
Federal benefit of deferred state income taxes | (199) | (179)
Deferred fuel, purchased energy and gas costs | 579 | 189
Pension benefits | 414 | 362
Other postretirement benefits | 73 | 73
Loss and credit carryforwards | (1,790) | (1,571)
Valuation allowances | 138 | 140
Partnership basis differences | 470 | 398
Other | 107 | (127)
Total net deferred income tax liabilities | 6,398 | 6,372
Deferred Investment Tax Credits – Regulated Operations | 300 | 286
Total Deferred Taxes and Deferred Investment Tax Credits | 6,698 | 6,658
Virginia Electric and Power Company |  |
Deferred income taxes: |  |
Total deferred income tax assets | 1,535 | 1,373
Total deferred income tax liabilities | 4,701 | 4,286
Total net deferred income tax liabilities | 3,166 | 2,913
Plant and equipment, primarily depreciation method and basis differences | 3,355 | 3,327
Excess deferred income taxes | (616) | (629)
Nuclear decommissioning | 311 | 324
Deferred state income taxes | 566 | 420
Federal benefit of deferred state income taxes | (119) | (88)
Deferred fuel, purchased energy and gas costs | 403 | 126
Pension benefits | (105) | (119)
Other postretirement benefits | 111 | 93
Loss and credit carryforwards | (751) | (537)
Valuation allowances | 7 | 6
Other | 4 | (10)
Total net deferred income tax liabilities | 3,166 | 2,913
Deferred Investment Tax Credits – Regulated Operations | 286 | 270
Total Deferred Taxes and Deferred Investment Tax Credits | $ 3,452 | $ 3,183

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