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Operating Segments - Virginia Power (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Charge for RGGI compliance cost, after tax | $ 134 |  |  |  |
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax | 142 |  |  |  |
Gain (loss) on investments |  |  | $ (505) | $ 639 | $ 412
Benefit for change in CCRO reserve, after tax |  | $ 97 |  |  |
Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge for RGGI compliance cost, after tax | 134 |  |  |  |
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax | $ 142 |  |  |  |
Benefit for change in CCRO reserve, after tax |  | $ 97 |  |  |
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net expenses |  |  | (2,900) | (485) | (1,200)
Charge associated with storm damage and service restoration |  |  | 125 |  |
Charge associated with storm damage and service restoration, after tax |  |  | 93 |  |
Operating Segments | Nuclear Decommissioning Trust Fund |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on investments |  |  | 559 | 568 | 335
Gain (loss) on investments, after tax |  |  | 451 | 445 | 264
Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset early retirement expense |  |  |  |  | 751
Asset early retirement expense after tax |  |  |  |  | 559
Charges associated with budget process related to customer arrears |  |  |  | 77 |
Charges associated with budget process related to customer arrears, after tax |  |  |  | 57 |
Charge associated with storm damage and service restoration |  |  | 117 | 68 |
Charge associated with storm damage and service restoration, after tax |  |  | 87 | 50 |
Loss from unbilled revenue reduction |  |  |  | 151 |
Loss from unbilled revenue reduction, after tax |  |  |  | 112 |
Net charge associated with settlement of the 2021 Triennial Review |  |  |  | 125 |
Net charge associated with settlement of the 2021 Triennial Review, after tax |  |  |  | 93 |
Amortization of regulatory asset |  |  | 243 | 61 |
Amortization of regulatory asset after tax |  |  | 181 | 45 |
Charge for RGGI compliance cost |  |  | 213 |  |
Charge for RGGI compliance cost, after tax |  |  | 159 |  |
Charge in connection with comprehensive settlement agreement for fuel expenses |  |  | 191 |  |
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax |  |  | 142 |  |
Charges for Dismantling cost |  |  | 167 |  |
Charges for Dismantling cost, after tax |  |  | 124 |  |
Benefit for change in CCRO reserve |  |  |  | 130 |
Benefit for change in CCRO reserve, after tax |  |  |  | 97 |
Charge for expected CCRO |  |  |  |  | 130
Charge for expected CCRO, net of tax |  |  |  |  | 97
Charges associated with legislation enacted related to customer arrears |  |  |  |  | 127
Charges associated with legislation enacted related to customer arrears, net of tax |  |  |  |  | 94
Operating Segments | Virginia Electric and Power Company | Nuclear Decommissioning Trust Fund |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on investments |  |  | (78) |  |
Gain (loss) on investments, after tax |  |  | (58) |  |
Operating Segments | Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net expenses |  |  | (1,700) | 705 | (2,900)
After- tax net expenses for specific items |  |  | (1,700) | 821 | (2,700)
Operating Segments | Corporate and Other | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net expenses |  |  | (792) | (202) | (863)
After- tax net expenses for specific items |  |  | $ (773) | $ (202) | $ (915)

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