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Operating Segments - Virginia Power (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax | $ 38 | $ 48 | $ (187) | $ 17
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 | $ (9) | (41) | (14)
Charge related to a voluntary retirement program |  |  |  | 192
Charge related to a voluntary retirement program, after-tax |  |  |  | 143
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 |  |  | 2,900 | 1,800
Gain loss on investments held in nuclear decommissioning trust funds |  |  | 145 | 336
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  | 115 | 251
Operating Segments | Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  |  | 3,100 | 2,100
Operating Segments | Virginia Electric and Power Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  |  | 654 | 607
Asset early retirement expense |  |  | 751 |
Asset early retirement expense after tax |  |  | 559 |
Operating Segments | Virginia Electric and Power Company | Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  |  | $ 654 | $ 652

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