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Operating Segments - Virginia Power (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | $ (113) | $ 152
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | (269) | (87)
Operating Segments | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | (125) | 134
Gain (loss) on investments, after tax | (102) | 100
Operating Segments | Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | (311) | 71
After- tax net benefits (expenses) for specific items | (289) | 115
Operating Segments | Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | (159) |
Charge associated with storm damage and service restoration | 94 | 51
Charge associated with storm damage and service restoration, after tax | 70 | 38
Charge for amortization of a regulatory asset, 2021 Triennial Review | 61 |
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax | 45 |
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 |  | 76
Charges associated with budget process related to customer arrears, after tax |  | 56
Loss from unbilled revenue reduction |  | 151
Loss from unbilled revenue reduction, after tax |  | 112
Operating Segments | Virginia Electric and Power Company | Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | (159) | (58)
After- tax net benefits (expenses) for specific items | $ (130) | $ (117)

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