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Quarterly Financial and Common Stock Data (Unaudited) (Quarterly Financial and Common Stock Data) (Detail) - USD ($) $ / shares in Units, $ 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
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating 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]
Income from operations | 953 | 1,152 | 753 | 1,079 | 765 | 1,102 | 740 | 841 | 3,937 |  | 3,448 |  | 3,420 |
Net income including noncontrolling interests | 1,333 | 696 | 417 | 674 | 491 | 728 | 462 | 531 | 3,120 |  | 2,212 |  | 1,923 |
Net income (loss) attributable to Dominion Energy | $ 1,312 | $ 665 | $ 390 | $ 632 | $ 457 | $ 690 | $ 452 | $ 524 | $ 2,999 |  | $ 2,123 |  | $ 1,899 |
Net income attributable to Dominion Energy - Basic | $ 2.04 | $ 1.03 | $ 0.62 | $ 1.01 | $ 0.73 | $ 1.10 | $ 0.73 | $ 0.88 | $ 4.72 |  | $ 3.44 |  | $ 3.21 |
Net income attributable to Dominion Energy - Diluted | 2.04 | 1.03 | 0.62 | 1.01 | 0.73 | 1.10 | 0.73 | 0.88 | 4.72 |  | 3.44 |  | 3.20 |
Dividends declared per share | $ 0.770 | $ 0.770 | $ 0.755 | $ 0.755 | $ 0.700 | $ 0.700 | $ 0.700 | $ 0.700 | $ 3.035 |  | $ 2.800 |  | $ 2.590 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | $ 1,824 | $ 2,154 | $ 1,747 | $ 1,831 | $ 1,711 | $ 2,211 | $ 1,776 | $ 1,890 | $ 7,556 |  | $ 7,588 |  | $ 7,622 |
Income from operations | 619 | 847 | 613 | 653 | 369 | 914 | 553 | 514 | 2,732 |  | 2,350 |  | 2,121 |
Net income (loss) attributable to Dominion Energy | 407 | 459 | 318 | 356 | 172 | 503 | 280 | 263 | 1,540 |  | 1,218 |  | 1,087 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | 501 | 401 | 422 | 490 | 457 | 382 | 368 | 431 | 1,814 | [2] | 1,638 | [2] | 1,716 | [2]
Income from operations | 181 | 185 | 116 | 156 | 156 | 114 | 167 | 156 | 638 |  | 593 |  | 727 |
Net income (loss) attributable to Dominion Energy | $ 313 | $ 117 | $ 77 | $ 108 | $ 106 | $ 83 | $ 105 | $ 98 | $ 615 |  | $ 392 |  | $ 457 |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | $ 85.30 | $ 80.67 | $ 81.65 | $ 79.36 | $ 77.32 | $ 78.97 | $ 77.93 | $ 75.18 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | $ 75.75 | $ 75.40 | $ 76.17 | $ 70.87 | $ 69.51 | $ 72.49 | $ 68.71 | $ 66.25 |  |  |  |  |  |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 24 for amounts attributable to related parties.

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