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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | [1] | $ 3,970 | $ 3,088 | $ 7,828 | $ 6,554
Net income (loss) |  | 54 | 449 | (626) | 952
Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 1,938 | 1,829 | 3,903 | 3,577
Net income (loss) |  | 100 | 339 | 120 | 523
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | [2] | 530 | 508 | 1,096 | 898
Net income from discontinued operations |  | 26 | 45 | 80 | 102
Net income (loss) |  | 119 | 83 | 309 | 263
Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (303) | (187) | (523) | (376)
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 3,970 | 3,088 | 7,828 | 6,554
Adjustments/Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  |  | 14 |  | 42
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (303) | (173) | (523) | (334)
Power Delivery |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 585 | 528 | 1,183 | 1,091
Net income (loss) |  | 156 | 145 | 311 | 301
Power Delivery | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 6 | 6 | 12 | 12
Power Delivery | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 591 | 534 | 1,195 | 1,103
Power Delivery | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 585 | 528 | 1,183 | 1,091
Net income (loss) |  | 156 | 145 | 310 | 299
Power Generation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 1,598 | 1,635 | 3,343 | 3,495
Net income (loss) |  | 250 | 276 | 558 | 624
Power Generation | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 5 | 3 | 9 | 5
Power Generation | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 1,603 | 1,638 | 3,352 | 3,500
Power Generation | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 1,353 | 1,301 | 2,749 | 2,701
Net income (loss) |  | 237 | 227 | 441 | 449
Gas Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 881 | 914 | 2,254 | 2,136
Net income (loss) |  | 247 | 249 | 606 | 576
Gas Infrastructure | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 29 | 8 | 55 | 14
Gas Infrastructure | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 910 | 922 | 2,309 | 2,150
Gas Infrastructure | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 530 | 508 | 1,096 | 898
Net income from discontinued operations |  | 0 | 0 | 0 | 0
Net income (loss) |  | 116 | 130 | 254 | 253
Southeast Energy |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 915 |  | 2,097 |
Net income (loss) |  | 82 |  | 214 |
Southeast Energy | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 915 |  | 2,097 |
Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (9) | (3) | (1,049) | (210)
Net income (loss) |  | (681) | (221) | (2,315) | (549)
Corporate and Other | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 263 | 170 | 447 | 345
Corporate and Other | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 254 | 167 | (602) | 135
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 0 | 0 | (29) | (215)
Net income (loss) |  | (293) | (33) | (631) | (225)
Corporate and Other | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 0 | 0 | 0 | 0
Net income from discontinued operations |  | 26 | 45 | 80 | 102
Net income (loss) |  | $ 3 | $ (47) | $ 55 | $ 10
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 20 for amounts attributable to related parties.

X
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