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Operating Segments - Virginia Power (Narrative) (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | $ (658) | $ 370
Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | (89) | 46
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | (1,800) | (617)
Operating Segments | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | (691) | 309
Gain (loss) on investments, after tax | (536) | 248
Operating Segments | Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | (1,700) | (642)
After- tax net benefits (expenses) for specific items | (1,600) | (492)
Operating Segments | Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | (601) |
Charge in connection with proposed comprehensive settlement agreement for fuel expenses | 191 |
Charge in connection with proposed comprehensive settlement agreement for fuel expenses, after-tax | 142 |
Charge for RGGI compliance cost | 213 |
Charge for RGGI compliance cost, after tax | 159 |
Charge associated with storm damage and service restoration | 94 | 68
Charge associated with storm damage and service restoration, after tax | 70 | 50
Charges for Dismantling cost | 60 |
Charges for Dismantling cost, after tax | 45 |
Charge for amortization of a regulatory asset, 2021 Triennial Review | 183 |
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax | 136 |
Benefit for change in CCRO reserve |  | 130
Benefit for change in CCRO reserve, after tax |  | 97
Charges associated with budget process related to customer arrears |  | 77
Charges associated with budget process related to customer arrears, after tax |  | 57
Loss from unbilled revenue reduction |  | 151
Loss from unbilled revenue reduction, after tax |  | 112
Charges associated with the settlement of the 2021 Triennial Review |  | 119
Charges associated with the settlement of the 2021 Triennial Review, after tax |  | 89
Operating Segments | Virginia Electric and Power Company | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | (96) |
Gain (loss) on investments, after tax | (71) |
Operating Segments | Virginia Electric and Power Company | Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | (601) | (118)
After- tax net benefits (expenses) for specific items | (641) | $ (186)
After-tax net benefits (expenses) attributable to operating segment | $ (635) |

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