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Acquisitions and Dispositions (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | $ (10) | $ 136 | $ (572) | $ 47
Net income (loss) including noncontrolling interests | [1],[2] | 19 | 38 | (1,753) | 526
Net income (loss) attributable to Dominion Energy |  | (13) | 38 | (1,850) | 520
Gas, Transmission & Storage |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Operating revenue |  | 1 |  | 4 |
Dominion Energy Gas Holdings, LLC | Gas, Transmission & Storage |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Operating revenue |  | 511 | 497 | 1,554 | 1,627
Operating Expense | [3] | 208 | 317 | 1,311 | 1,029
Other income (loss) |  | (5) | 13 | 27 | 42
Interest and related charges | [4] | 267 | 76 | 366 | 224
Income (loss) before income taxes |  | 31 | 117 | (96) | 416
Income tax expense (benefit) |  | (14) | 117 | (65) | 42
Net income (loss) including noncontrolling interests |  | 45 | 0 | (31) | 374
Noncontrolling interests |  | 32 | 0 | 97 | 6
Net income (loss) attributable to Dominion Energy |  | 13 | 0 | (128) | 368
Dominion Energy Gas Holdings, LLC | Q-Pipe Transaction |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Operating revenue |  | 59 | 60 | 182 | 185
Operating Expense | [3] | 16 | 31 | 78 | 100
Other income (loss) |  | 1 | 1 | 3 | 3
Interest and related charges | [4] | 5 | 5 | 15 | 15
Income (loss) before income taxes |  | 39 | 25 | 92 | 73
Income tax expense (benefit) |  | 5 | 19 | 19 | 6
Net income (loss) including noncontrolling interests |  | 34 | 6 | 73 | 67
Net income (loss) attributable to Dominion Energy |  | $ 34 | $ 6 | $ 73 | $ 67
[1] | Includes income tax expense (benefit) of $(10) million and $136 million for the three months ended September 30, 2020 and 2019, respectively and $(572) million and $47 million for the nine months ended September 30, 2020 and 2019, respectively.
[2] | See Note 10 for amounts attributable to related parties.
[3] | GT&S Transaction includes a charge of $482 million ($359 million after-tax) recorded in the second quarter of 2020 associated with the probable abandonment of a significant portion of the Supply Header Project as well as the establishment of a $75 million ARO as a result of the cancellation of the Atlantic Coast Pipeline Project.
[4] | GT&S Transaction includes a loss of $237 million recorded in the third quarter of 2020 associated with cash flow hedges of debt-related items that were determined to be probable of not occurring.

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