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Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Operating revenue | [1] | $ 3,466 | $ 3,384
Net income (loss) attributable to Dominion Energy |  | 503 | 632
Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | [2] | 1,748 | 1,831
Net income (loss) attributable to Dominion Energy |  | 184 | 356
Dominion Energy Gas Holdings, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue | [3] | 526 | 490
Net income (loss) attributable to Dominion Energy |  | 166 | 108
Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | (189) | (426)
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 3,466 | 3,384
Adjustments/Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 28 | 273
Net income (loss) attributable to Dominion Energy |  | 0 | 0
Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | (161) | (153)
Power Delivery |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 563 | 554
Net income (loss) attributable to Dominion Energy |  | 156 | 125
Power Delivery | Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 6 | 5
Power Delivery | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 569 | 559
Power Delivery | Operating Segments | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 563 | 557
Net income (loss) attributable to Dominion Energy |  | 154 | 125
Power Generation |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 1,860 | 1,653
Net income (loss) attributable to Dominion Energy |  | 348 | 261
Power Generation | Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 2 | 3
Power Generation | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 1,862 | 1,656
Power Generation | Operating Segments | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 1,400 | 1,274
Net income (loss) attributable to Dominion Energy |  | 222 | 223
Gas Infrastructure |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 1,222 | 901
Net income (loss) attributable to Dominion Energy |  | 327 | 263
Gas Infrastructure | Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 6 | 266
Gas Infrastructure | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 1,228 | 1,167
Gas Infrastructure | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 526 | 490
Net income (loss) attributable to Dominion Energy |  | 167 | 109
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | (207) | 3
Net income (loss) attributable to Dominion Energy |  | (328) | (17)
Corporate and Other | Intersegment revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 175 | 152
Corporate and Other | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | (32) | 155
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | (215) |
Net income (loss) attributable to Dominion Energy |  | (192) | 8
Corporate and Other | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenue |  | 0 | 0
Net income (loss) attributable to Dominion Energy |  | $ (1) | $ (1)
[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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