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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue | $ 4,475 | $ 4,269 | $ 3,970 | $ 3,858 | $ 3,361 | $ 3,451 | $ 3,088 | $ 3,466 | $ 16,572 | [1] | $ 13,366 | [1] | $ 12,586 | [1]
Income (loss) from operations | 1,221 | 1,314 | 461 | (482) | 834 | 1,150 | 742 | 875 | 2,514 |  | 3,601 |  | 3,937 |
Net income including noncontrolling interests | 1,010 | 985 | 58 | (677) | 662 | 883 | 478 | 526 | 1,376 |  | 2,549 |  | 3,120 |
Net income (loss) | $ 1,009 | $ 975 | $ 54 | $ (680) | $ 641 | $ 854 | $ 449 | $ 503 | $ 1,358 |  | $ 2,447 |  | $ 2,999 |
Net income attributable to Dominion Energy — Basic | $ 1.22 | $ 1.19 | $ 0.07 | $ (0.86) | $ 0.97 | $ 1.31 | $ 0.69 | $ 0.77 | $ 1.66 |  | $ 3.74 |  | $ 4.72 |
Net income attributable to Dominion Energy — Diluted | 1.21 | 1.17 | 0.05 | (0.86) | 0.97 | 1.30 | 0.69 | 0.77 | 1.62 |  | 3.74 |  | 4.72 |
Dividends declared per common share | $ 0.9175 | $ 0.9175 | $ 0.9175 | $ 0.9175 | $ 0.835 | $ 0.835 | $ 0.835 | $ 0.835 | $ 3.67 |  | $ 3.34 |  | $ 3.035 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue | $ 1,941 | $ 2,264 | $ 1,938 | $ 1,965 | $ 1,810 | $ 2,232 | $ 1,829 | $ 1,748 | $ 8,108 | [2] | $ 7,619 | [2] | $ 7,556 | [2]
Income (loss) from operations | 659 | 820 | 238 | 122 | 418 | 756 | 533 | 364 | 1,839 |  | 2,071 |  | 2,732 |
Net income (loss) | 427 | 602 | 100 | 20 | 239 | 520 | 339 | 184 | 1,149 |  | 1,282 |  | 1,540 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue | 571 | 502 | 530 | 566 | 566 | 533 | 508 | 389 | 2,169 | [3] | 1,996 | [3] | 1,523 | [3]
Income (loss) from operations | 276 | 202 | 179 | 247 | 228 | 302 | 90 | 167 | 904 |  | 787 |  | 552 |
Net income including noncontrolling interests | 292 | 175 | 149 | 226 | 72 | 242 | 129 | 213 | 842 |  | 656 |  | 829 |
Net income from continuing operations | 276 | 130 | 123 | 172 | 182 | 209 | 84 | 157 |  |  |  |  |  |
Net income (loss) from discontinued operations | 16 | 45 | 26 | 54 | (110) | 33 | 45 | 56 |  |  |  |  |  |
Net income (loss) | $ 261 | $ 151 | $ 119 | $ 190 | $ 27 | $ 191 | $ 83 | $ 180 | $ 721 |  | $ 481 |  | $ 703 |
Preferred Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per preferred share | $ 4.375 | $ 4.375 | $ 0.729 |  |  |  |  |  |  |  |  |  |  |
Preferred Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per preferred share | $ 1.9375 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 25 for amounts attributable to affiliates.
[3] | See Note 25 for amounts attributable to related parties.

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