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Operating Segment (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | $ 3,086 | $ 3,132 | $ 2,598 | $ 2,921 | $ 2,556 | $ 2,971 | $ 2,747 | $ 3,409 | $ 11,737 |  | $ 11,683 |  | $ 12,436 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 111 |  | 56 |  | 46 |
Income tax expense |  |  |  |  |  |  |  |  | 655 |  | 905 |  | 452 |
Net income (loss) attributable to Dominion | 457 | 690 | 452 | 524 | 357 | 593 | 413 | 536 | 2,123 |  | 1,899 |  | 1,310 |
Capital expenditures |  |  |  |  |  |  |  |  | 6,085 |  | 5,575 |  | 5,345 |
Investment in equity method affiliates | 1,561 |  |  |  | 1,320 |  |  |  | 1,561 |  | 1,320 |  |  |
Total assets | 71,610 |  |  |  | 58,648 |  |  |  | 71,610 |  | 58,648 |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 11,737 |  | 11,683 |  | 12,436 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 1,559 |  | 1,395 |  | 1,292 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 111 |  | 56 |  | 46 |
Interest income |  |  |  |  |  |  |  |  | 66 |  | 58 |  | 68 |
Interest and related charges |  |  |  |  |  |  |  |  | 1,010 |  | 904 |  | 1,193 |
Income tax expense |  |  |  |  |  |  |  |  | 655 |  | 905 |  | 452 |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | 2,123 |  | 1,899 |  | 1,310 |
Capital expenditures |  |  |  |  |  |  |  |  | 6,125 |  | 5,993 |  | 5,551 |
Investment in equity method affiliates | 1,561 |  |  |  | 1,320 |  |  |  | 1,561 |  | 1,320 |  |  |
Intersegment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | (1,339) |  | (1,284) |  | (1,504) |
Adjustments & Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 718 |  | 741 |  | 949 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest income |  |  |  |  |  |  |  |  | (78) |  | (44) |  | (33) |
Interest and related charges |  |  |  |  |  |  |  |  | (78) |  | (44) |  | (33) |
Income tax expense |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Capital expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Investment in equity method affiliates | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |  |
Total assets | (7,300) |  |  |  | (5,800) |  |  |  | (7,300) |  | (5,800) |  |  |
Segment Reconciling Items and Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | (621) |  | (543) |  | (555) |
DVP |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 2,233 |  | 2,111 |  | 1,936 |
DVP | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 2,210 |  | 2,091 |  | 1,918 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 537 |  | 498 |  | 462 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest income |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest and related charges |  |  |  |  |  |  |  |  | 244 |  | 230 |  | 205 |
Income tax expense |  |  |  |  |  |  |  |  | 308 |  | 307 |  | 317 |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | 484 |  | 490 |  | 502 |
Capital expenditures |  |  |  |  |  |  |  |  | 1,320 |  | 1,607 |  | 1,652 |
Investment in equity method affiliates | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |  |
Total assets | 15,600 |  |  |  | 14,700 |  |  |  | 15,600 |  | 14,700 |  |  |
DVP | Intersegment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 23 |  | 20 |  | 18 |
Dominion Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 6,757 |  | 7,016 |  | 7,169 |
Dominion Generation | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 6,747 |  | 7,001 |  | 7,135 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 662 |  | 591 |  | 514 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | (16) |  | (15) |  | (18) |
Interest income |  |  |  |  |  |  |  |  | 74 |  | 64 |  | 58 |
Interest and related charges |  |  |  |  |  |  |  |  | 290 |  | 262 |  | 240 |
Income tax expense |  |  |  |  |  |  |  |  | 279 |  | 465 |  | 365 |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | 1,397 |  | 1,120 |  | 1,061 |
Capital expenditures |  |  |  |  |  |  |  |  | 2,440 |  | 2,190 |  | 2,466 |
Investment in equity method affiliates | 228 |  |  |  | 245 |  |  |  | 228 |  | 245 |  |  |
Total assets | 27,100 |  |  |  | 25,600 |  |  |  | 27,100 |  | 25,600 |  |  |
Dominion Generation | Intersegment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 10 |  | 15 |  | 34 |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 2,766 |  | 2,572 |  | 3,326 |
Dominion Energy | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 2,069 |  | 1,877 |  | 2,446 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 330 |  | 262 |  | 243 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 105 |  | 60 |  | 54 |
Interest income |  |  |  |  |  |  |  |  | 34 |  | 25 |  | 23 |
Interest and related charges |  |  |  |  |  |  |  |  | 38 |  | 27 |  | 11 |
Income tax expense |  |  |  |  |  |  |  |  | 431 |  | 423 |  | 463 |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | 726 |  | 680 |  | 717 |
Capital expenditures |  |  |  |  |  |  |  |  | 2,322 |  | 2,153 |  | 1,329 |
Investment in equity method affiliates | 1,289 |  |  |  | 1,042 |  |  |  | 1,289 |  | 1,042 |  |  |
Total assets | 26,000 |  |  |  | 15,200 |  |  |  | 26,000 |  | 15,200 |  |  |
Dominion Energy | Intersegment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 697 |  | 695 |  | 880 |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 602 |  | 527 |  | 560 |
Corporate and Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | (7) |  | (27) |  | (12) |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 30 |  | 44 |  | 73 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 22 |  | 11 |  | 10 |
Interest income |  |  |  |  |  |  |  |  | 36 |  | 13 |  | 20 |
Interest and related charges |  |  |  |  |  |  |  |  | 516 |  | 429 |  | 770 |
Income tax expense |  |  |  |  |  |  |  |  | (363) |  | (290) |  | (693) |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | (484) |  | (391) |  | (970) |
Capital expenditures |  |  |  |  |  |  |  |  | 43 |  | 43 |  | 104 |
Investment in equity method affiliates | 44 |  |  |  | 33 |  |  |  | 44 |  | 33 |  |  |
Total assets | 10,200 |  |  |  | 8,900 |  |  |  | 10,200 |  | 8,900 |  |  |
Corporate and Other | Intersegment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 609 |  | 554 |  | 572 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | 1,711 | 2,211 | 1,776 | 1,890 | 1,614 | 2,058 | 1,813 | 2,137 | 7,588 | [1] | 7,622 | [1] | 7,579 | [1]
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 1,025 |  | 953 |  | 915 |
Interest income |  |  |  |  |  |  |  |  | 0 |  | 7 |  | 8 |
Interest and related charges |  |  |  |  |  |  |  |  | 461 |  | 443 |  | 411 |
Income tax expense |  |  |  |  |  |  |  |  | 727 |  | 659 |  | 548 |
Net income (loss) attributable to Dominion | 172 | 503 | 280 | 263 | 187 | 385 | 246 | 269 | 1,218 |  | 1,087 |  | 858 |
Capital expenditures |  |  |  |  |  |  |  |  | 2,489 |  | 2,474 |  | 2,911 |
Capital expenditures |  |  |  |  |  |  |  |  | 2,649 |  | 2,689 |  | 3,107 |
Total assets | 33,308 |  |  |  | 31,565 |  |  |  | 33,308 |  | 31,565 |  |  |
Virginia Electric and Power Company | Adjustments & Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest income |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest and related charges |  |  |  |  |  |  |  |  | (2) |  | (1) |  | 0 |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Capital expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total assets | (100) |  |  |  | (100) |  |  |  | (100) |  | (100) |  |  |
Virginia Electric and Power Company | DVP | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 2,217 |  | 2,099 |  | 1,928 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 537 |  | 498 |  | 462 |
Interest income |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest and related charges |  |  |  |  |  |  |  |  | 244 |  | 230 |  | 205 |
Income tax expense |  |  |  |  |  |  |  |  | 307 |  | 308 |  | 317 |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | 482 |  | 490 |  | 509 |
Capital expenditures |  |  |  |  |  |  |  |  | 1,313 |  | 1,569 |  | 1,651 |
Total assets | 15,600 |  |  |  | 14,700 |  |  |  | 15,600 |  | 14,700 |  |  |
Virginia Electric and Power Company | Dominion Generation | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 5,390 |  | 5,566 |  | 5,651 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 488 |  | 453 |  | 416 |
Interest income |  |  |  |  |  |  |  |  | 0 |  | 7 |  | 8 |
Interest and related charges |  |  |  |  |  |  |  |  | 219 |  | 210 |  | 203 |
Income tax expense |  |  |  |  |  |  |  |  | 524 |  | 437 |  | 416 |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | 909 |  | 750 |  | 691 |
Capital expenditures |  |  |  |  |  |  |  |  | 1,336 |  | 1,120 |  | 1,456 |
Total assets | 17,800 |  |  |  | 17,000 |  |  |  | 17,800 |  | 17,000 |  |  |
Virginia Electric and Power Company | Corporate and Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | (19) |  | (43) |  | 0 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 0 |  | 2 |  | 37 |
Interest income |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest and related charges |  |  |  |  |  |  |  |  | 0 |  | 4 |  | 3 |
Income tax expense |  |  |  |  |  |  |  |  | (104) |  | (86) |  | (185) |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | (173) |  | (153) |  | (342) |
Capital expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total assets | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |  |
Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | 457 | 382 | 368 | 431 | 425 | 365 | 395 | 531 | 1,638 | [2] | 1,716 | [2] | 1,898 | [2]
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 204 |  | 217 |  | 197 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 21 |  | 23 |  | 21 |
Interest income |  |  |  |  |  |  |  |  | 1 |  | 1 |  | 1 |
Interest and related charges |  |  |  |  |  |  |  |  | 94 |  | 73 |  | 27 |
Income tax expense |  |  |  |  |  |  |  |  | 215 |  | 283 |  | 334 |
Net income (loss) attributable to Dominion | 106 | $ 83 | $ 105 | $ 98 | 100 | $ 111 | $ 85 | $ 161 | 392 |  | 457 |  | 512 |
Capital expenditures |  |  |  |  |  |  |  |  | 854 |  | 795 |  | 719 |
Investment in equity method affiliates | 98 |  |  |  | 102 |  |  |  | 98 |  | 102 |  |  |
Total assets | 11,142 |  |  |  | 10,308 |  |  |  | 11,142 |  | 10,308 |  |  |
Dominion Gas Holdings, LLC | Dominion Energy | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 1,638 |  | 1,716 |  | 1,898 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 214 |  | 213 |  | 197 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 21 |  | 23 |  | 21 |
Interest income |  |  |  |  |  |  |  |  | 1 |  | 1 |  | 1 |
Interest and related charges |  |  |  |  |  |  |  |  | 92 |  | 72 |  | 27 |
Income tax expense |  |  |  |  |  |  |  |  | 237 |  | 296 |  | 340 |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | 395 |  | 478 |  | 521 |
Capital expenditures |  |  |  |  |  |  |  |  | 854 |  | 795 |  | 719 |
Investment in equity method affiliates | 98 |  |  |  | 102 |  |  |  | 98 |  | 102 |  |  |
Total assets | 10,500 |  |  |  | 9,700 |  |  |  | 10,500 |  | 9,700 |  |  |
Dominion Gas Holdings, LLC | Corporate and Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | (10) |  | 4 |  | 0 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest income |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest and related charges |  |  |  |  |  |  |  |  | 2 |  | 1 |  | 0 |
Income tax expense |  |  |  |  |  |  |  |  | (22) |  | (13) |  | (6) |
Net income (loss) attributable to Dominion |  |  |  |  |  |  |  |  | (3) |  | (21) |  | (9) |
Capital expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | $ 0 |
Investment in equity method affiliates | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |  |
Total assets | $ 600 |  |  |  | $ 600 |  |  |  | $ 600 |  | $ 600 |  |  |
[1] | See Note 24 for amounts attributable to affiliates.
[2] | See Note 24 for amounts attributable to related parties.

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