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Operating Segments (Tables) | 3 Months Ended
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Mar. 31, 2018
Segment Reporting Information [Line Items] |
Segment Reporting Disclosure Other Information | A description of the operations included in the Companies’ primary operating segments is as follows:
Primary Operating Segment |  | Description of Operations |  | Dominion Energy |  | Virginia Power |  | Dominion Energy Gas
Power Delivery |  | Regulated electric distribution |  | X |  | X |  |
|  | Regulated electric transmission |  | X |  | X |  |
Power Generation |  | Regulated electric fleet |  | X |  | X |  |
|  | Merchant electric fleet |  | X |  |  |  |
Gas Infrastructure |  | Gas transmission and storage |  | X |  |  |  | X
|  | Gas distribution and storage |  | X |  |  |  | X
|  | Gas gathering and processing |  | X |  |  |  | X
|  | LNG terminalling and storage |  | X |  |  |  |
|  | Nonregulated retail energy marketing |  | X |  |  |  |
Schedule of Segment Reporting Information, by Segment | The following table presents segment information pertaining to Dominion Energy’s operations:
|  | Power Delivery |  |  | Power Generation |  |  | Gas Infrastructure |  |  | Corporate and Other |  |  | Adjustments/ Eliminations |  |  | Consolidated Total |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three Months Ended March 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue from external customers |  | $ | 563 |  |  | $ | 1,860 |  |  | $ | 1,222 |  |  | $ | (207 | ) |  | $ | 28 |  |  | $ | 3,466 |
Intersegment revenue |  |  | 6 |  |  |  | 2 |  |  |  | 6 |  |  |  | 175 |  |  |  | (189 | ) |  |  | — |
Total operating revenue |  |  | 569 |  |  |  | 1,862 |  |  |  | 1,228 |  |  |  | (32 | ) |  |  | (161 | ) |  |  | 3,466 |
Net income (loss) attributable to Dominion Energy |  |  | 156 |  |  |  | 348 |  |  |  | 327 |  |  |  | (328 | ) |  |  | — |  |  |  | 503 |
Three Months Ended March 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue from external customers |  | $ | 554 |  |  | $ | 1,653 |  |  | $ | 901 |  |  | $ | 3 |  |  | $ | 273 |  |  | $ | 3,384 |
Intersegment revenue |  |  | 5 |  |  |  | 3 |  |  |  | 266 |  |  |  | 152 |  |  |  | (426 | ) |  |  | — |
Total operating revenue |  |  | 559 |  |  |  | 1,656 |  |  |  | 1,167 |  |  |  | 155 |  |  |  | (153 | ) |  |  | 3,384 |
Net income (loss) attributable to Dominion Energy |  |  | 125 |  |  |  | 261 |  |  |  | 263 |  |  |  | (17 | ) |  |  | — |  |  |  | 632 |
Virginia Electric and Power Company |
Segment Reporting Information [Line Items] |
Schedule of Segment Reporting Information, by Segment | The following table presents segment information pertaining to Virginia Power’s operations:
|  | Power Delivery |  |  | Power Generation |  |  | Corporate and Other |  |  | Consolidated Total |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three Months Ended March 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ | 563 |  |  | $ | 1,400 |  |  | $ | (215 | ) |  | $ | 1,748 |
Net income (loss) |  |  | 154 |  |  |  | 222 |  |  |  | (192 | ) |  |  | 184 |
Three Months Ended March 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ | 557 |  |  | $ | 1,274 |  |  | $ | — |  |  | $ | 1,831 |
Net income |  |  | 125 |  |  |  | 223 |  |  |  | 8 |  |  |  | 356 |
Dominion Energy Gas Holdings, LLC |
Segment Reporting Information [Line Items] |
Schedule of Segment Reporting Information, by Segment | The following table presents segment information pertaining to Dominion Energy Gas' operations:
|  | Gas Infrastructure |  |  | Corporate and Other |  |  | Consolidated Total |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
Three Months Ended March 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ | 526 |  |  | $ | — |  |  | $ | 526 |
Net income (loss) |  |  | 167 |  |  |  | (1 | ) |  |  | 166 |
Three Months Ended March 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ | 490 |  |  | $ | — |  |  | $ | 490 |
Net income (loss) |  |  | 109 |  |  |  | (1 | ) |  |  | 108 |

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