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Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | [1] | $ 4,269 | $ 3,451 | $ 12,097 | $ 10,005
Net income (loss) |  | 975 | 854 | 349 | 1,806
Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | [2] | 2,264 | 2,232 | 6,167 | 5,809
Net income (loss) |  | 602 | 520 | 722 | 1,043
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue | [3] | 392 | 423 | 1,303 | 1,408
Net income (loss) |  | 92 | 136 | 255 | 317
Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (203) | (175) | (726) | (551)
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 4,269 | 3,451 | 12,097 | 10,005
Adjustments/Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  |  | (2) |  | 40
Net income (loss) |  |  |  |  | 0
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (203) | (177) | (726) | (511)
Power Delivery |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 678 | 596 | 1,861 | 1,687
Net income (loss) |  | 185 | 163 | 496 | 464
Power Delivery | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 5 | 5 | 17 | 17
Power Delivery | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 683 | 601 | 1,878 | 1,704
Power Delivery | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 677 | 595 | 1,860 | 1,686
Net income (loss) |  | 184 | 163 | 494 | 462
Power Generation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 1,848 | 2,021 | 5,191 | 5,516
Net income (loss) |  | 490 | 414 | 1,048 | 1,038
Power Generation | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 6 | 3 | 15 | 8
Power Generation | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 1,854 | 2,024 | 5,206 | 5,524
Power Generation | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 1,587 | 1,637 | 4,336 | 4,338
Net income (loss) |  | 444 | 347 | 885 | 796
Gas Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 788 | 836 | 3,042 | 2,972
Net income (loss) |  | 232 | 264 | 838 | 840
Gas Infrastructure | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 28 | 7 | 83 | 21
Gas Infrastructure | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 816 | 843 | 3,125 | 2,993
Gas Infrastructure | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 392 | 423 | 1,314 | 1,408
Net income (loss) |  | 100 | 146 | 316 | 421
Southeast Energy |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 973 |  | 3,070 |
Net income (loss) |  | 147 |  | 361 |
Southeast Energy | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 973 |  | 3,070 |
Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | (18) |  | (1,067) | (210)
Net income (loss) |  | (79) | 13 | (2,394) | (536)
Corporate and Other | Intersegment revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 164 | 160 | 611 | 505
Corporate and Other | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 146 | 160 | (456) | 295
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 0 | 0 | (29) | (215)
Net income (loss) |  | (26) | 10 | (657) | (215)
Corporate and Other | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenue |  | 0 | 0 | (11) | 0
Net income (loss) |  | $ (8) | $ (10) | $ (61) | $ (104)
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 20 for amounts attributable to affiliates.
[3] | See Note 20 for amounts attributable to related parties.

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