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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ 3,361 | $ 3,451 | $ 3,088 | $ 3,466 | $ 3,210 | $ 3,179 | $ 2,813 | $ 3,384 | $ 13,366 | [1] | $ 12,586 | [1] | $ 11,737 | [1]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2,000 |  | 1,905 |  | 1,559 |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 403 |  | 15 |  | 4 |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | (380) |  | (147) |  | (40) |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 197 |  | (18) |  | 111 |
Interest income |  |  |  |  |  |  |  |  |  | 84 |  | 82 |  | 66 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 1,493 |  | 1,205 |  | 1,010 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 580 |  | (30) |  | 655 |
Net income (loss) |  | 641 | 854 | 449 | 503 | 1,312 | 665 | 390 | 632 | 2,447 |  | 2,999 |  | 2,123 |
Investment in equity method investees |  | 1,278 |  |  |  | 1,544 |  |  |  | 1,278 |  | 1,544 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 4,405 |  | 5,909 |  | 6,125 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 4,254 |  | 5,504 |  | 6,085 |
Total assets |  | 77,914 |  |  |  | 76,585 |  |  |  | 77,914 |  | 76,585 |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | 566 | 533 | 508 | 389 | 405 | 351 | 363 | 404 | 1,996 | [2] | 1,523 | [2] | 1,374 | [2]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 333 |  | 242 |  | 191 |
Impairment of assets and related charges |  | 219 |  |  |  |  |  |  |  | 163 |  | 15 |  |  |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | (117) |  | (70) |  | (44) |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 54 |  | 47 |  | 44 |
Interest income |  |  |  |  |  |  |  |  |  | 26 |  | 4 |  | 3 |
Interest and related charges | [2] |  |  |  |  |  |  |  |  | 174 |  | 60 |  | 65 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 124 |  | (65) |  | 197 |
Net income from discontinued operations | [3] |  |  |  |  |  |  |  |  | 24 |  | 163 |  | 152 |
Net income (loss) |  | 27 | 191 | 83 | 180 | 387 | 119 | 78 | 119 | 481 |  | 703 |  | 477 |
Investment in equity method investees |  | 339 |  |  |  | 349 |  |  |  | 339 |  | 349 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,109 |  | 1,815 |  | 2,188 |
Total assets |  | 26,751 |  |  |  | 22,491 |  |  |  | 26,751 |  | 22,491 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | 1,810 | 2,232 | 1,829 | 1,748 | 1,824 | 2,154 | 1,747 | 1,831 | 7,619 | [4] | 7,556 | [4] | 7,588 | [4]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,132 |  | 1,141 |  | 1,025 |
Interest income |  |  |  |  |  |  |  |  |  | 10 |  | 19 |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 511 |  | 494 |  | 461 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 300 |  | 774 |  | 727 |
Net income (loss) |  | 239 | $ 520 | $ 339 | $ 184 | 407 | $ 459 | $ 318 | $ 356 | 1,282 |  | 1,540 |  | 1,218 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 2,542 |  | 2,729 |  | 2,649 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 2,228 |  | 2,496 |  | 2,489 |
Total assets |  | 36,880 |  |  |  | 35,139 |  |  |  | 36,880 |  | 35,139 |  |  |
Gas Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 4,221 |  | 2,832 |  | 2,069 |
Gas Infrastructure | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 1,996 |  | 1,523 |  | 1,374 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 333 |  | 242 |  | 191 |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 5 |  | 15 |  |  |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | (117) |  | (70) |  | (44) |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 54 |  | 47 |  | 44 |
Interest income |  |  |  |  |  |  |  |  |  | 26 |  | 4 |  | 3 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 173 |  | 60 |  | 65 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 226 |  | 189 |  | 219 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 571 |  | 314 |  | 322 |
Investment in equity method investees |  | 339 |  |  |  | 349 |  |  |  | 339 |  | 349 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 751 |  | 1,459 |  | 1,830 |
Total assets |  | 19,900 |  |  |  | 15,800 |  |  |  | 19,900 |  | 15,800 |  |  |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (208) |  | 16 |  | (7) |
Corporate and Other | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 158 |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (102) |  | (254) |  | (22) |
Net income from discontinued operations |  |  |  |  |  |  |  |  |  | 24 |  | 163 |  | 152 |
Net income (loss) |  |  |  |  |  |  |  |  |  | (90) |  | 389 |  | 155 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 358 |  | 356 |  | 358 |
Total assets |  | 6,900 |  |  |  | 6,700 |  |  |  | 6,900 |  | 6,700 |  |  |
Power Delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,206 |  | 2,206 |  | 2,210 |
Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 7,104 |  | 6,676 |  | 6,747 |
Adjustments & Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 43 |  | 856 |  | 718 |
Interest income |  |  |  |  |  |  |  |  |  | (196) |  | (155) |  | (78) |
Interest and related charges |  |  |  |  |  |  |  |  |  | (196) |  | (155) |  | (78) |
Total assets |  | (10,800) |  |  |  | (9,100) |  |  |  | (10,800) |  | (9,100) |  |  |
Adjustments & Eliminations | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | (4) |  | (3) |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | (4) |  | (3) |  | (2) |
Total assets |  | (100) |  |  |  | (100) |  |  |  | (100) |  | (100) |  |  |
Intersegment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (735) |  | (1,476) |  | (1,339) |
Intersegment revenue | Gas Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 27 |  | 834 |  | 697 |
Intersegment revenue | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 674 |  | 610 |  | 609 |
Intersegment revenue | Power Delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 23 |  | 22 |  | 23 |
Intersegment revenue | Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 11 |  | 10 |  | 10 |
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (692) |  | (620) |  | (621) |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 13,366 |  | 12,586 |  | 11,737 |
Operating Segments | Gas Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 4,248 |  | 3,666 |  | 2,766 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 615 |  | 522 |  | 330 |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | (186) |  | (147) |  | (44) |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 178 |  | 159 |  | 105 |
Interest income |  |  |  |  |  |  |  |  |  | 64 |  | 45 |  | 34 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 268 |  | 109 |  | 38 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 330 |  | 487 |  | 431 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 1,214 |  | 898 |  | 726 |
Investment in equity method investees |  | 1,159 |  |  |  | 1,422 |  |  |  | 1,159 |  | 1,422 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,415 |  | 2,149 |  | 2,322 |
Total assets |  | 31,500 |  |  |  | 28,000 |  |  |  | 31,500 |  | 28,000 |  |  |
Operating Segments | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 466 |  | 626 |  | 602 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 14 |  | 43 |  | 30 |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 394 |  | 15 |  | 4 |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | (200) |  |  |  |  |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 1 |  | 4 |  | 22 |
Interest income |  |  |  |  |  |  |  |  |  | 126 |  | 96 |  | 36 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 782 |  | 644 |  | 516 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (204) |  | (1,224) |  | (363) |
Net income (loss) |  |  |  |  |  |  |  |  |  | (608) |  | 389 |  | (484) |
Investment in equity method investees |  | 37 |  |  |  | 41 |  |  |  | 37 |  | 41 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 105 |  | 52 |  | 43 |
Total assets |  | 11,200 |  |  |  | 12,000 |  |  |  | 11,200 |  | 12,000 |  |  |
Operating Segments | Corporate and Other | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (215) |  |  |  | (19) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (25) |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 5 |  | 3 |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (78) |  | (94) |  | (104) |
Net income (loss) |  |  |  |  |  |  |  |  |  | (312) |  | 74 |  | (173) |
Operating Segments | Power Delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,229 |  | 2,228 |  | 2,233 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 625 |  | 593 |  | 537 |
Interest income |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 265 |  | 265 |  | 244 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 160 |  | 334 |  | 308 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 587 |  | 531 |  | 484 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,564 |  | 1,433 |  | 1,320 |
Total assets |  | 17,800 |  |  |  | 16,700 |  |  |  | 17,800 |  | 16,700 |  |  |
Operating Segments | Power Delivery | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,204 |  | 2,212 |  | 2,217 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 624 |  | 594 |  | 537 |
Interest income |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 265 |  | 265 |  | 244 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 158 |  | 334 |  | 307 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 586 |  | 527 |  | 482 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,539 |  | 1,439 |  | 1,313 |
Total assets |  | 17,600 |  |  |  | 16,600 |  |  |  | 17,600 |  | 16,600 |  |  |
Operating Segments | Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 7,115 |  | 6,686 |  | 6,757 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 746 |  | 747 |  | 662 |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | 6 |  |  |  | 4 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 18 |  | (181) |  | (16) |
Interest income |  |  |  |  |  |  |  |  |  | 90 |  | 92 |  | 74 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 374 |  | 342 |  | 290 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 294 |  | 373 |  | 279 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 1,254 |  | 1,181 |  | 1,397 |
Investment in equity method investees |  | 82 |  |  |  | 81 |  |  |  | 82 |  | 81 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,321 |  | 2,275 |  | 2,440 |
Total assets |  | 28,200 |  |  |  | 29,000 |  |  |  | 28,200 |  | 29,000 |  |  |
Operating Segments | Power Generation | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 5,630 |  | 5,344 |  | 5,390 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 533 |  | 547 |  | 488 |
Interest income |  |  |  |  |  |  |  |  |  | 9 |  | 15 |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 250 |  | 232 |  | 219 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 220 |  | 534 |  | 524 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 1,008 |  | 939 |  | 909 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,003 |  | 1,290 |  | $ 1,336 |
Total assets |  | $ 19,400 |  |  |  | $ 18,600 |  |  |  | $ 19,400 |  | $ 18,600 |  |  |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 24 for amounts attributable to related parties.
[3] | Includes income tax expense of less than $1 million, $91 million and $80 million in 2018, 2017 and 2016, respectively.
[4] | See Note 24 for amounts attributable to affiliates.

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