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Operating Segments - Dominion Energy Gas (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] |  |  |  |
Impairment of assets and other charges | $ 531 | $ 312 | $ 1,299 | $ 1,147
Dominion Energy Gas Holdings, LLC |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairment of assets and other charges | $ 482 | $ 13 | 482 | 13
DETI |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairment of assets and other charges |  |  | 482 |
Asset impairment charges after tax |  |  | 359 |
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  |  | 2,900 | 1,800
Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Charge related to a voluntary retirement program |  |  |  | 42
Charge related to a voluntary retirement program, after-tax |  |  |  | 31
Operating Segments | Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  |  | 3,100 | 2,100
Operating Segments | Corporate and Other | Dominion Energy Gas Holdings, LLC |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  |  | 365 | 44
Operating Segments | Gas, Transmission & Storage | Dominion Energy Gas Holdings, LLC |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  |  | $ 365 | $ 43

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