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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | $ 3,794 | $ 3,596 | $ 9,046 | $ 7,875
Net Income (Loss) from discontinued operations including noncontrolling interest | [1] | 13 | (1) | 8 | 18
Net income (loss) attributable to Dominion Energy |  | 599 | (453) | 1,596 | 258
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 3,794 | 3,596 | 9,046 | 7,875
Adjustments & Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 0 | 0 | 0 | 0
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 | 0 | 0 | 0
Adjustments & Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | (251) | (231) | (505) | (471)
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | (251) | (231) | (505) | (471)
Dominion Energy Virginia |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 2,253 | 2,172 | 4,641 | 4,341
Dominion Energy Virginia | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 2,254 | 2,175 | 4,643 | 4,347
Net Income (Loss) from discontinued operations including noncontrolling interest |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | 391 | 440 | 777 | 958
Dominion Energy Virginia | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | (1) | (3) | (2) | (6)
Gas Distribution |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 626 | 565 | 1,994 | 1,795
Gas Distribution | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 626 | 565 | 1,993 | 1,794
Net Income (Loss) from discontinued operations including noncontrolling interest |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | 103 | 125 | 381 | 419
Gas Distribution | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 0 | 0 | 1 | 1
Dominion Energy South Carolina |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 773 | 815 | 1,618 | 1,614
Dominion Energy South Carolina | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 771 | 812 | 1,615 | 1,610
Net Income (Loss) from discontinued operations including noncontrolling interest |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | 68 | 124 | 159 | 233
Dominion Energy South Carolina | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 2 | 3 | 3 | 4
Contracted Assets |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 132 | 167 | 443 | 416
Contracted Assets | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 127 | 161 | 435 | 406
Net Income (Loss) from discontinued operations including noncontrolling interest |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | 11 | 20 | 167 | 121
Contracted Assets | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 5 | 6 | 8 | 10
Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 261 | 108 | 855 | 180
Corporate and Other | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | 16 | (117) | 360 | (282)
Net Income (Loss) from discontinued operations including noncontrolling interest |  | 13 | (1) | 8 | 18
Net income (loss) attributable to Dominion Energy |  | 26 | (1,162) | 112 | (1,473)
Corporate and Other | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  | $ 245 | $ 225 | $ 495 | $ 462
[1] | Includes income tax expense (benefit) of $4 million and $(2) million for the three months ended June 30, 2023 and 2022, respectively, and $3 million and $4 million for the six months ended June 30, 2023 and 2022, respectively.

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