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Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 3,210 | $ 3,179 | $ 2,813 | $ 3,384 | $ 3,086 | $ 3,132 | $ 2,598 | $ 2,921 | $ 12,586 | [1] | $ 11,737 | [1] | $ 11,683 | [1]
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,905 |  | 1,559 |  | 1,395 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | (18) |  | 111 |  | 56 |
Interest income |  |  |  |  |  |  |  |  | 82 |  | 66 |  | 58 |
Interest and related charges |  |  |  |  |  |  |  |  | 1,205 |  | 1,010 |  | 904 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (30) |  | 655 |  | 905 |
Net income | 1,312 | 665 | 390 | 632 | 457 | 690 | 452 | 524 | 2,999 |  | 2,123 |  | 1,899 |
Investment in equity method investees | 1,544 |  |  |  | 1,561 |  |  |  | 1,544 |  | 1,561 |  | 1,320 |
Capital expenditures |  |  |  |  |  |  |  |  | 5,504 |  | 6,085 |  | 5,575 |
Capital expenditures |  |  |  |  |  |  |  |  | 5,909 |  | 6,125 |  | 5,993 |
Total assets | 76,585 |  |  |  | 71,610 |  |  |  | 76,585 |  | 71,610 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | 1,824 | 2,154 | 1,747 | 1,831 | 1,711 | 2,211 | 1,776 | 1,890 | 7,556 |  | 7,588 |  | 7,622 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,141 |  | 1,025 |  | 953 |
Interest income |  |  |  |  |  |  |  |  | 19 |  |  |  | 7 |
Interest and related charges |  |  |  |  |  |  |  |  | 494 |  | 461 |  | 443 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 774 |  | 727 |  | 659 |
Net income | 407 | 459 | 318 | 356 | 172 | 503 | 280 | 263 | 1,540 |  | 1,218 |  | 1,087 |
Capital expenditures |  |  |  |  |  |  |  |  | 2,496 |  | 2,489 |  | 2,474 |
Capital expenditures |  |  |  |  |  |  |  |  | 2,729 |  | 2,649 |  | 2,689 |
Total assets | 35,139 |  |  |  | 33,308 |  |  |  | 35,139 |  | 33,308 |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | 501 | 401 | 422 | 490 | 457 | 382 | 368 | 431 | 1,814 | [2] | 1,638 | [2] | 1,716 | [2]
Depreciation and amortization |  |  |  |  |  |  |  |  | 227 |  | 204 |  | 217 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 21 |  | 21 |  | 23 |
Interest income |  |  |  |  |  |  |  |  | 2 |  | 1 |  | 1 |
Interest and related charges |  |  |  |  |  |  |  |  | 97 |  | 94 |  | 73 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 51 |  | 215 |  | 283 |
Net income | 313 | $ 117 | $ 77 | $ 108 | 106 | $ 83 | $ 105 | $ 98 | 615 |  | 392 |  | 457 |
Investment in equity method investees | 95 |  |  |  | 98 |  |  |  | 95 |  | 98 |  | 102 |
Capital expenditures |  |  |  |  |  |  |  |  | 778 |  | 854 |  | 795 |
Total assets | 11,940 |  |  |  | 11,142 |  |  |  | 11,940 |  | 11,142 |  |  |
Power Delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 2,206 |  | 2,210 |  | 2,091 |
Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 6,676 |  | 6,747 |  | 7,001 |
Gas Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 2,832 |  | 2,069 |  | 1,877 |
Gas Infrastructure | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,814 |  | 1,638 |  | 1,716 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 227 |  | 214 |  | 213 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 21 |  | 21 |  | 23 |
Interest income |  |  |  |  |  |  |  |  | 2 |  | 1 |  | 1 |
Interest and related charges |  |  |  |  |  |  |  |  | 97 |  | 92 |  | 72 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 256 |  | 237 |  | 296 |
Net income |  |  |  |  |  |  |  |  | 436 |  | 395 |  | 478 |
Investment in equity method investees | 95 |  |  |  | 98 |  |  |  | 95 |  | 98 |  | 102 |
Capital expenditures |  |  |  |  |  |  |  |  | 778 |  | 854 |  | 795 |
Total assets | 11,300 |  |  |  | 10,500 |  |  |  | 11,300 |  | 10,500 |  |  |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 16 |  | (7) |  | (27) |
Corporate and Other | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | (10) |  | 4 |
Interest and related charges |  |  |  |  |  |  |  |  |  |  | 2 |  | 1 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (205) |  | (22) |  | (13) |
Net income |  |  |  |  |  |  |  |  | 179 |  | (3) |  | (21) |
Total assets | 600 |  |  |  | 600 |  |  |  | 600 |  | 600 |  |  |
Adjustments & Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 856 |  | 718 |  | 741 |
Interest income |  |  |  |  |  |  |  |  | (155) |  | (78) |  | (44) |
Interest and related charges |  |  |  |  |  |  |  |  | (155) |  | (78) |  | (44) |
Total assets | (9,100) |  |  |  | (7,300) |  |  |  | (9,100) |  | (7,300) |  |  |
Adjustments & Eliminations | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | (3) |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  | (3) |  | (2) |  | (1) |
Total assets | (100) |  |  |  | (100) |  |  |  | (100) |  | (100) |  |  |
Intersegment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | (1,476) |  | (1,339) |  | (1,284) |
Intersegment revenue | Power Delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | (22) |  | (23) |  | (20) |
Intersegment revenue | Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | (10) |  | (10) |  | (15) |
Intersegment revenue | Gas Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | (834) |  | (697) |  | (695) |
Intersegment revenue | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | (610) |  | (609) |  | (554) |
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | (620) |  | (621) |  | (543) |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 12,586 |  | 11,737 |  | 11,683 |
Operating Segments | Power Delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 2,228 |  | 2,233 |  | 2,111 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 593 |  | 537 |  | 498 |
Interest income |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  | 265 |  | 244 |  | 230 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 334 |  | 308 |  | 307 |
Net income |  |  |  |  |  |  |  |  | 531 |  | 484 |  | 490 |
Capital expenditures |  |  |  |  |  |  |  |  | 1,433 |  | 1,320 |  | 1,607 |
Total assets | 16,700 |  |  |  | 15,600 |  |  |  | 16,700 |  | 15,600 |  |  |
Operating Segments | Power Delivery | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 2,212 |  | 2,217 |  | 2,099 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 594 |  | 537 |  | 498 |
Interest income |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  | 265 |  | 244 |  | 230 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 334 |  | 307 |  | 308 |
Net income |  |  |  |  |  |  |  |  | 527 |  | 482 |  | 490 |
Capital expenditures |  |  |  |  |  |  |  |  | 1,439 |  | 1,313 |  | 1,569 |
Total assets | 16,600 |  |  |  | 15,600 |  |  |  | 16,600 |  | 15,600 |  |  |
Operating Segments | Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 6,686 |  | 6,757 |  | 7,016 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 747 |  | 662 |  | 591 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | (181) |  | (16) |  | (15) |
Interest income |  |  |  |  |  |  |  |  | 92 |  | 74 |  | 64 |
Interest and related charges |  |  |  |  |  |  |  |  | 342 |  | 290 |  | 262 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 373 |  | 279 |  | 465 |
Net income |  |  |  |  |  |  |  |  | 1,181 |  | 1,397 |  | 1,120 |
Investment in equity method investees | 81 |  |  |  | 228 |  |  |  | 81 |  | 228 |  | 245 |
Capital expenditures |  |  |  |  |  |  |  |  | 2,275 |  | 2,440 |  | 2,190 |
Total assets | 29,000 |  |  |  | 27,100 |  |  |  | 29,000 |  | 27,100 |  |  |
Operating Segments | Power Generation | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 5,344 |  | 5,390 |  | 5,566 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 547 |  | 488 |  | 453 |
Interest income |  |  |  |  |  |  |  |  | 15 |  |  |  | 7 |
Interest and related charges |  |  |  |  |  |  |  |  | 232 |  | 219 |  | 210 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 534 |  | 524 |  | 437 |
Net income |  |  |  |  |  |  |  |  | 939 |  | 909 |  | 750 |
Capital expenditures |  |  |  |  |  |  |  |  | 1,290 |  | 1,336 |  | 1,120 |
Total assets | 18,600 |  |  |  | 17,800 |  |  |  | 18,600 |  | 17,800 |  |  |
Operating Segments | Gas Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 3,666 |  | 2,766 |  | 2,572 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 522 |  | 330 |  | 262 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 159 |  | 105 |  | 60 |
Interest income |  |  |  |  |  |  |  |  | 45 |  | 34 |  | 25 |
Interest and related charges |  |  |  |  |  |  |  |  | 109 |  | 38 |  | 27 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 487 |  | 431 |  | 423 |
Net income |  |  |  |  |  |  |  |  | 898 |  | 726 |  | 680 |
Investment in equity method investees | 1,422 |  |  |  | 1,289 |  |  |  | 1,422 |  | 1,289 |  | 1,042 |
Capital expenditures |  |  |  |  |  |  |  |  | 2,149 |  | 2,322 |  | 2,153 |
Total assets | 28,000 |  |  |  | 26,000 |  |  |  | 28,000 |  | 26,000 |  |  |
Operating Segments | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 626 |  | 602 |  | 527 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 43 |  | 30 |  | 44 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 4 |  | 22 |  | 11 |
Interest income |  |  |  |  |  |  |  |  | 96 |  | 36 |  | 13 |
Interest and related charges |  |  |  |  |  |  |  |  | 644 |  | 516 |  | 429 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (1,224) |  | (363) |  | (290) |
Net income |  |  |  |  |  |  |  |  | 389 |  | (484) |  | (391) |
Investment in equity method investees | 41 |  |  |  | 44 |  |  |  | 41 |  | 44 |  | 33 |
Capital expenditures |  |  |  |  |  |  |  |  | 52 |  | 43 |  | 43 |
Total assets | $ 12,000 |  |  |  | $ 10,200 |  |  |  | 12,000 |  | 10,200 |  |  |
Operating Segments | Corporate and Other | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  | (19) |  | (43) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Interest income |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (94) |  | (104) |  | (86) |
Net income |  |  |  |  |  |  |  |  | $ 74 |  | $ (173) |  | $ (153) |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 24 for amounts attributable to related parties.

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