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v3.20.2

Operating Segments - Virginia Power (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Charge for Expected customer credit reinvestment offset |  |  | $ 200 |
Charge for Expected customer credit reinvestment offset, net of tax |  |  | 149 |
Gain loss on investments held in nuclear decommissioning trust funds, after tax | $ (36) | $ (94) | (223) | $ (77)
Virginia Electric and Power Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset early retirement expense |  |  |  | 369
Asset early retirement expense after tax |  |  |  | 275
Gain loss on investments held in nuclear decommissioning trust funds, after tax | $ 5 | $ (15) | (36) | (29)
Charge related to a voluntary retirement program |  |  |  | 197
Charge related to a voluntary retirement program, after-tax |  |  |  | 146
Asset planned early retirement expense |  |  |  | 160
Asset planned early retirement expense, after tax |  |  |  | 119
Operating revenue recorded charge |  |  |  | 135
Operating revenue recorded charge, after tax |  |  |  | 100
Cancellation abandonment expense |  |  |  | 62
Cancellation abandonment expense, after tax |  |  |  | 46
Benefit from revision of future closure costs |  |  |  | 113
Benefit from revision of future closure costs, after tax |  |  |  | 84
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  |  | 1,300 | 1,800
Gain loss on investments held in nuclear decommissioning trust funds |  |  |  | 364
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  | 272
Operating Segments | Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  |  | 3,400 | 1,700
Operating Segments | Virginia Electric and Power Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  |  | 815 | 653
Asset early retirement expense |  |  | 751 |
Asset early retirement expense after tax |  |  | 559 |
Charge for Expected customer credit reinvestment offset |  |  | 200 |
Charge for Expected customer credit reinvestment offset, net of tax |  |  | 149 |
Operating Segments | Virginia Electric and Power Company | Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  |  | $ 815 | $ 673

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