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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | [1] | $ 3,088 | $ 2,813 | $ 6,554 | $ 6,197
Net income (loss) attributable to Dominion Energy |  | 449 | 390 | 952 | 1,022
Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | [2] | 1,829 | 1,747 | 3,577 | 3,578
Net income (loss) attributable to Dominion Energy |  | 339 | 318 | 523 | 674
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | [3] | 459 | 422 | 985 | 912
Net income (loss) attributable to Dominion Energy |  | 15 | 77 | 181 | 185
Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (187) | (333) | (376) | (759)
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 3,088 | 2,813 | 6,554 | 6,197
Adjustments/Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 14 | 181 | 42 | 454
Net income (loss) attributable to Dominion Energy |  | 0 | 0 | 0 | 0
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (173) | (152) | (334) | (305)
Power Delivery |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 528 | 530 | 1,091 | 1,084
Net income (loss) attributable to Dominion Energy |  | 145 | 127 | 301 | 252
Power Delivery | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 6 | 7 | 12 | 12
Power Delivery | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 534 | 537 | 1,103 | 1,096
Power Delivery | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 528 | 533 | 1,091 | 1,090
Net income (loss) attributable to Dominion Energy |  | 145 | 125 | 299 | 250
Power Generation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 1,635 | 1,507 | 3,495 | 3,160
Net income (loss) attributable to Dominion Energy |  | 276 | 240 | 624 | 501
Power Generation | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 3 | 2 | 5 | 5
Power Generation | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 1,638 | 1,509 | 3,500 | 3,165
Power Generation | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 1,301 | 1,214 | 2,701 | 2,488
Net income (loss) attributable to Dominion Energy |  | 227 | 198 | 449 | 421
Gas Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 914 | 589 | 2,136 | 1,490
Net income (loss) attributable to Dominion Energy |  | 249 | 163 | 576 | 426
Gas Infrastructure | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 8 | 175 | 14 | 441
Gas Infrastructure | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 922 | 764 | 2,150 | 1,931
Gas Infrastructure | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 459 | 422 | 985 | 912
Net income (loss) attributable to Dominion Energy |  | 108 | 88 | 275 | 197
Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (3) | 6 | (210) | 9
Net income (loss) attributable to Dominion Energy |  | (221) | (140) | (549) | (157)
Corporate and Other | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 170 | 149 | 345 | 301
Corporate and Other | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 167 | 155 | 135 | 310
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  |  | 0 | (215) | 0
Net income (loss) attributable to Dominion Energy |  | (33) | (5) | (225) | 3
Corporate and Other | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | $ (93) | $ (11) | $ (94) | $ (12)
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 18 for amounts attributable to affiliates.
[3] | See Note 18 for amounts attributable to related parties.

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