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Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | [1] | $ 4,496 | $ 3,858
Net income (loss) |  | (270) | (680)
Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | [2] | 1,930 | 1,965
Net income (loss) |  | (280) | 20
Dominion Energy Gas Holdings, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue | [3] | 556 | 566
Net income (loss) |  | 169 | 190
Net Income from discontinued operations |  |  | 54
Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | (341) | (334)
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 4,496 | 3,858
Adjustments&Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  |  | (33)
Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | (341) | (367)
Dominion Energy Virginia |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 1,938 | 2,001
Net income (loss) |  | 429 | 361
Dominion Energy Virginia | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 1,930 | 1,994
Net income (loss) |  | 427 | 358
Dominion Energy Virginia | Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | (3) | (4)
Dominion Energy Virginia | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 1,935 | 1,997
Gas, Transmission & Storage |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 644 | 984
Net income (loss) |  | 221 | 222
Gas, Transmission & Storage | Dominion Energy Gas Holdings, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 556 | 566
Net income (loss) |  | 174 | 138
Net Income from discontinued operations |  |  | 0
Gas, Transmission & Storage | Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 57 | 54
Gas, Transmission & Storage | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 701 | 1,038
Distribution |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 887 | 917
Net income (loss) |  | 225 | 205
Distribution | Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 3 | 4
Distribution | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 890 | 921
Dominion Energy South Carolina |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 713 | 689
Net income (loss) |  | 94 | 71
Dominion Energy South Carolina | Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 1 |
Dominion Energy South Carolina | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 714 | 689
Contracted Generation |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 286 | 352
Net income (loss) |  | 59 | 102
Contracted Generation | Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 4 | 3
Contracted Generation | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 290 | 355
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 28 | (1,052)
Net income (loss) |  | (1,298) | (1,641)
Corporate and Other | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 0 | (29)
Net income (loss) |  | (707) | (338)
Corporate and Other | Dominion Energy Gas Holdings, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 0 | 0
Net income (loss) |  | (5) | 52
Net Income from discontinued operations |  |  | 54
Corporate and Other | Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | 279 | 277
Corporate and Other | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenue |  | $ 307 | $ (775)
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 19 for amounts attributable to affiliates.
[3] | See Note 19 for amounts attributable to related parties.

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