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Commitments and Contingencies (Nuclear Operations) (Narrative) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | Feb. 28, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement amount awarded from other party |  |  | $ 48,000,000 |  |  |
Minimum financial assurance |  |  |  | $ 3,600,000,000 |  |
NRC minimum requirement for nuclear power plant licensees |  |  |  | 1,060,000,000.00 |  |
Maximum assessment for premiums on insurance policy |  |  |  | 32,000,000 |  |
Maximum assessment for insurance policy |  |  |  | 65,000,000 |  |
Spent Nuclear Fuel |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Receivables |  |  |  | 56,000,000 | $ 52,000,000 |
Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Amount that could be assessed for each licensed reactor |  |  |  | 138,000,000 |  |
Amount that could be assessed for each licensed reactor per reactor |  |  |  | 20,000,000 |  |
Nuclear Obligations |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Maximum liability protection per nuclear incident amount |  |  |  | 13,700,000,000 |  |
Nuclear Obligations | Secondary Financial Protection Program |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Maximum liability protection per nuclear incident amount | $ 13,700,000,000 | $ 13,500,000,000 |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Minimum financial assurance |  |  |  | 2,100,000,000 |  |
Maximum assessment for premiums on insurance policy |  |  |  | 33,000,000 |  |
Maximum assessment for insurance policy |  |  |  | 9,000,000 |  |
Virginia Electric and Power Company | Spent Nuclear Fuel |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Receivables |  |  |  | 37,000,000 | 39,000,000 |
DESC | Non-nuclear Obligation | European Mutual Association |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Property insurance coverage |  |  |  | 1,000,000 |  |
Surry and North Anna |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement amount awarded from other party |  |  |  | 17,000,000 | 25,000,000 | $ 24,000,000
Millstone |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement amount awarded from other party |  |  |  | 7,000,000 | 9,000,000 | 11,000,000
Summer |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement amount awarded from other party |  |  |  | 1,000,000 | $ 1,000,000 | $ 4,000,000
Millstone, Summer, Surry and North Anna |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Amount of coverage purchased from commercial insurance pools |  |  |  | 450,000,000 |  |
Property insurance coverage |  |  |  | $ 1,060,000,000.00 |  |

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