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Operating Segments (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | $ 2,813 | $ 2,598 | $ 6,197 | $ 5,519
Net income (loss) attributable to Dominion Energy |  | 390 | 452 | 1,022 | 976
Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers | [1] | 1,747 | 1,776 | 3,578 | 3,666
Net income (loss) attributable to Dominion Energy |  | 318 | 280 | 674 | 543
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers | [2] | 422 | 368 | 912 | 799
Net income (loss) attributable to Dominion Energy |  | 77 | 105 | 185 | 203
Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | (333) | (265) | (759) | (643)
Adjustments/Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 181 | 128 | 454 | 312
Net income (loss) attributable to Dominion Energy |  | 0 | 0 | 0 | 0
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | (152) | (137) | (305) | (331)
Power Delivery |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 537 | 518 | 1,096 | 1,079
Power Delivery | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 530 | 512 | 1,084 | 1,068
Net income (loss) attributable to Dominion Energy |  | 127 | 104 | 252 | 224
Power Delivery | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 533 | 512 | 1,090 | 1,069
Net income (loss) attributable to Dominion Energy |  | 125 | 104 | 250 | 222
Power Delivery | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 7 | 6 | 12 | 11
Power Generation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 1,509 | 1,566 | 3,165 | 3,262
Power Generation | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 1,507 | 1,564 | 3,160 | 3,257
Net income (loss) attributable to Dominion Energy |  | 240 | 171 | 501 | 416
Power Generation | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 1,214 | 1,264 | 2,488 | 2,597
Net income (loss) attributable to Dominion Energy |  | 198 | 174 | 421 | 340
Power Generation | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 2 | 2 | 5 | 5
Gas Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 764 | 515 | 1,931 | 1,178
Gas Infrastructure | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 589 | 391 | 1,490 | 876
Net income (loss) attributable to Dominion Energy |  | 163 | 162 | 426 | 348
Gas Infrastructure | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 422 | 368 | 912 | 799
Net income (loss) attributable to Dominion Energy |  | 88 | 108 | 197 | 211
Gas Infrastructure | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 175 | 124 | 441 | 302
Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 155 | 136 | 310 | 331
Corporate and Other | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 6 | 3 | 9 | 6
Net income (loss) attributable to Dominion Energy |  | (140) | 15 | (157) | (12)
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | (5) | 2 | 3 | (19)
Corporate and Other | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | 0 | 0 | 0 | 0
Net income (loss) attributable to Dominion Energy |  | (11) | (3) | (12) | (8)
Corporate and Other | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue from external customers |  | $ 149 | $ 133 | $ 301 | $ 325
[1] | See Note 17 for amounts attributable to affiliates.
[2] | See Note 17 for amounts attributable to related parties.

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