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Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | $ 3,596 | $ 3,038 | $ 7,875 | $ 6,908
Net Income (Loss) from discontinued operations including noncontrolling interest | [1] | (1) | 26 | 18 | 54
Net income (loss) attributable to Dominion Energy |  | (453) | 285 | 258 | 1,293
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 3,596 | 3,037 | 7,875 | 6,906
Adjustments & Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 0 | 11 | 0 | 28
Net Income (Loss) from discontinued operations including noncontrolling interest |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | 0 | 0 | 0 | 0
Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 0 | 1 | 0 | 2
Adjustments & Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | (231) | (250) | (471) | (501)
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | (231) | (239) | (471) | (473)
Dominion Energy Virginia |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 2,172 | 1,747 | 4,341 | 3,732
Dominion Energy Virginia | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 2,175 | 1,752 | 4,347 | 3,739
Net Income (Loss) from discontinued operations including noncontrolling interest |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | 440 | 431 | 958 | 865
Dominion Energy Virginia | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | (3) | (5) | (6) | (7)
Gas Distribution |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 565 | 455 | 1,795 | 1,431
Gas Distribution | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 565 | 453 | 1,794 | 1,428
Net Income (Loss) from discontinued operations including noncontrolling interest |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | 125 | 95 | 419 | 346
Gas Distribution | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 0 | 2 | 1 | 3
Dominion Energy South Carolina |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 815 | 681 | 1,614 | 1,435
Dominion Energy South Carolina | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 812 | 679 | 1,610 | 1,431
Net Income (Loss) from discontinued operations including noncontrolling interest |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | 124 | 84 | 233 | 186
Dominion Energy South Carolina | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 3 | 2 | 4 | 4
Contracted Assets |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 167 | 274 | 416 | 563
Contracted Assets | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 161 | 257 | 406 | 525
Net Income (Loss) from discontinued operations including noncontrolling interest |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | 20 | 104 | 121 | 254
Contracted Assets | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 6 | 17 | 10 | 38
Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 108 | 120 | 180 | 220
Corporate and Other | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | (117) | (115) | (282) | (245)
Net Income (Loss) from discontinued operations including noncontrolling interest |  | (1) | 26 | 18 | 54
Net income (loss) attributable to Dominion Energy |  | (1,162) | (429) | (1,473) | (358)
Corporate and Other | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | $ 225 | $ 235 | $ 462 | $ 465
[1] | Includes income tax expense (benefit) of $(2) million and $4 million for the three months ended June 30, 2022 and 2021, respectively, and $4 million and $11 million for the six months ended June 30, 2022 and 2021, respectively.

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