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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, 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
Segment Reporting Information [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]
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 2,655 |  | 2,000 |  | 1,905 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 168 |  | 197 |  | (18) |
Interest income |  |  |  |  |  |  |  |  |  | 101 |  | 84 |  | 82 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 1,773 |  | 1,493 |  | 1,205 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 351 |  | 580 |  | (30) |
Net income (loss) |  | 1,009 | 975 | 54 | (680) | 641 | 854 | 449 | 503 | 1,358 |  | 2,447 |  | 2,999 |
Investment in equity method investees |  | 1,646 |  |  |  | 1,278 |  |  |  | 1,646 |  | 1,278 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 5,321 |  |  |  |  |
Total assets |  | 103,823 |  |  |  | 77,914 |  |  |  | 103,823 |  | 77,914 |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | 571 | 502 | 530 | 566 | 566 | 533 | 508 | 389 | 2,169 | [2] | 1,996 | [2] | 1,523 | [2]
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 367 |  | 333 |  | 242 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 43 |  | 54 |  | 47 |
Interest income |  |  |  |  |  |  |  |  |  | 105 |  | 26 |  | 4 |
Interest and related charges | [2] |  |  |  |  |  |  |  |  | 311 |  | 174 |  | 60 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 101 |  | 124 |  | (65) |
Net Income (loss) from discontinued operations | [3] |  |  |  |  |  |  |  |  | 141 |  | 24 |  | 163 |
Net income (loss) |  | 261 | 151 | 119 | 190 | 27 | 191 | 83 | 180 | 721 |  | 481 |  | 703 |
Investment in equity method investees |  | 312 |  |  |  | 339 |  |  |  | 312 |  | 339 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 704 |  | 1,109 |  | 1,815 |
Total assets |  | 18,784 |  |  |  | 26,751 |  |  |  | 18,784 |  | 26,751 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | 1,941 | 2,264 | 1,938 | 1,965 | 1,810 | 2,232 | 1,829 | 1,748 | 8,108 | [4] | 7,619 | [4] | 7,556 | [4]
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 1,223 |  | 1,132 |  | 1,141 |
Interest income |  |  |  |  |  |  |  |  |  | 11 |  | 10 |  | 19 |
Interest and related charges | [4] |  |  |  |  |  |  |  |  | 524 |  | 511 |  | 494 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 264 |  | 300 |  | 774 |
Net income (loss) |  | 427 | $ 602 | $ 100 | $ 20 | 239 | $ 520 | $ 339 | $ 184 | 1,149 |  | 1,282 |  | 1,540 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 2,981 |  | 2,542 |  | 2,729 |
Total assets |  | 41,428 |  |  |  | 36,880 |  |  |  | 41,428 |  | 36,880 |  |  |
Dominion Energy South Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,948 |  |  |  |  |
Dominion Energy Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 8,170 |  | 8,401 |  | 8,254 |
Dominion Energy Virginia | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 8,137 |  | 7,835 |  | 7,556 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 1,215 |  | 1,157 |  | 1,141 |
Interest income |  |  |  |  |  |  |  |  |  | 11 |  | 10 |  | 19 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 529 |  | 516 |  | 497 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 481 |  | 378 |  | 868 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 1,783 |  | 1,594 |  | 1,466 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 2,981 |  | 2,542 |  | 2,729 |
Total assets |  | 41,400 |  |  |  | 37,000 |  |  |  | 41,400 |  | 37,000 |  |  |
Gas, Transmission & Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 3,074 |  | 1,867 |  | 1,054 |
Gas, Transmission & Storage | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,186 |  | 1,996 |  | 1,523 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 367 |  | 333 |  | 242 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 43 |  | 54 |  | 47 |
Interest income |  |  |  |  |  |  |  |  |  | 105 |  | 26 |  | 4 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 309 |  | 173 |  | 60 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 170 |  | 226 |  | 189 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 594 |  | 571 |  | 314 |
Investment in equity method investees |  | 312 |  |  |  | 339 |  |  |  | 312 |  | 339 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 391 |  | 749 |  | 1,459 |
Total assets |  | 18,800 |  |  |  | 19,900 |  |  |  | 18,800 |  | 19,900 |  |  |
Gas Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,367 |  | 1,769 |  | 1,778 |
Contracted Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 1,135 |  | 1,487 |  | 1,345 |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (1,122) |  | (249) |  | (27) |
Corporate and Other | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (17) |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 2 |  | 1 |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (69) |  | (102) |  | (254) |
Net Income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  | 141 |  | 24 |  | 163 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 127 |  | (90) |  | 389 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 313 |  | 360 |  | 356 |
Total assets |  | 0 |  |  |  | 6,900 |  |  |  | 0 |  | 6,900 |  |  |
Corporate and Other | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 29 |  | 216 |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 8 |  | (25) |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | (5) |  | (5) |  | (3) |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (217) |  | (78) |  | (94) |
Net income (loss) |  |  |  |  |  |  |  |  |  | (634) |  | (312) |  | 74 |
Total assets |  |  |  |  |  | (100) |  |  |  |  |  | (100) |  |  |
Adjustments & Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  |  | 91 |  | 182 |
Interest income |  |  |  |  |  |  |  |  |  | (386) |  | (271) |  | (222) |
Interest and related charges |  |  |  |  |  |  |  |  |  | (386) |  | (272) |  | (222) |
Total assets |  | (9,700) |  |  |  | (12,900) |  |  |  | (9,700) |  | (12,900) |  |  |
Intersegment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (1,470) |  | (918) |  | (1,008) |
Intersegment revenue | Dominion Energy South Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Intersegment revenue | Dominion Energy Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (13) |  | (552) |  | (688) |
Intersegment revenue | Gas, Transmission & Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 247 |  | 723 |  | 946 |
Intersegment revenue | Gas Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 18 |  | 16 |  | 17 |
Intersegment revenue | Contracted Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 15 |  | 8 |  | 9 |
Intersegment revenue | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 1,199 |  | 723 |  | 724 |
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (1,470) |  | (827) |  | (826) |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 4,405 |  | 5,909 |
Operating Segments | Dominion Energy South Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,952 |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 452 |  |  |  |  |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | (4) |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 242 |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 163 |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 430 |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 562 |  |  |  |  |
Total assets |  | 15,800 |  |  |  |  |  |  |  | 15,800 |  |  |  |  |
Operating Segments | Dominion Energy Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 8,157 |  | 7,849 |  | 7,566 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 1,216 |  | 1,158 |  | 1,141 |
Interest income |  |  |  |  |  |  |  |  |  | 11 |  | 10 |  | 19 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 530 |  | 516 |  | 497 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 482 |  | 380 |  | 865 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 1,786 |  | 1,596 |  | 1,466 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 3,002 |  | 2,640 |  | 2,726 |
Total assets |  | 43,700 |  |  |  | 39,100 |  |  |  | 43,700 |  | 39,100 |  |  |
Operating Segments | Gas, Transmission & Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 3,321 |  | 2,590 |  | 2,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 400 |  | 348 |  | 260 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 161 |  | 178 |  | 158 |
Interest income |  |  |  |  |  |  |  |  |  | 211 |  | 143 |  | 114 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 405 |  | 262 |  | 100 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 262 |  | 236 |  | 291 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 934 |  | 844 |  | 552 |
Investment in equity method investees |  | 1,517 |  |  |  | 1,159 |  |  |  | 1,517 |  | 1,159 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 431 |  | 765 |  | 1,489 |
Total assets |  | 20,900 |  |  |  | 22,600 |  |  |  | 20,900 |  | 22,600 |  |  |
Operating Segments | Gas Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,385 |  | 1,785 |  | 1,795 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 335 |  | 263 |  | 258 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 116 |  | 79 |  | 72 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 114 |  | 95 |  | 195 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 488 |  | 373 |  | 351 |
Investment in equity method investees |  | 32 |  |  |  |  |  |  |  | 32 |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 848 |  | 647 |  | 452 |
Total assets |  | 16,000 |  |  |  | 11,800 |  |  |  | 16,000 |  | 11,800 |  |  |
Operating Segments | Contracted Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 1,150 |  | 1,495 |  | 1,354 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 179 |  | 213 |  | 200 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | (1) |  | 18 |  | (171) |
Interest income |  |  |  |  |  |  |  |  |  | 92 |  | 80 |  | 77 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 98 |  | 124 |  | 110 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 20 |  | 75 |  | (160) |
Net income (loss) |  |  |  |  |  |  |  |  |  | 276 |  | 245 |  | 253 |
Investment in equity method investees |  | 74 |  |  |  | 82 |  |  |  | 74 |  | 82 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 367 |  | 247 |  | 979 |
Total assets |  | 10,200 |  |  |  | 9,000 |  |  |  | 10,200 |  | 9,000 |  |  |
Operating Segments | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 77 |  | 474 |  | 697 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 73 |  | 18 |  | 46 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 10 |  | 1 |  | (5) |
Interest income |  |  |  |  |  |  |  |  |  | 160 |  | 122 |  | 94 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 768 |  | 784 |  | 648 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (690) |  | (206) |  | (1,221) |
Net income (loss) |  |  |  |  |  |  |  |  |  | (2,556) |  | (611) |  | 377 |
Investment in equity method investees |  | 23 |  |  |  | 37 |  |  |  | 23 |  | 37 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 111 |  | 106 |  | $ 263 |
Total assets |  | $ 6,900 |  |  |  | $ 8,300 |  |  |  | $ 6,900 |  | $ 8,300 |  |  |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 25 for amounts attributable to related parties.
[3] | Includes income tax expense of $33 million, less than $1 million and $91 million in 2019, 2018 and 2017, respectively.
[4] | See Note 25 for amounts attributable to affiliates.

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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