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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 |  | $ 3,361.0 | $ 3,451.0 | $ 3,088.0 | $ 3,466.0 | $ 3,210.0 | $ 3,179.0 | $ 2,813.0 | $ 3,384.0 | $ 13,366.0 | [1] | $ 12,586.0 | [1] | $ 11,737.0 | [1]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2,000.0 |  | 1,905.0 |  | 1,559.0 |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 403.0 |  | 15.0 |  | 4.0 |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | (380.0) |  | (147.0) |  | (40.0) |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 197.0 |  | (18.0) |  | 111.0 |
Interest income |  |  |  |  |  |  |  |  |  | 84.0 |  | 82.0 |  | 66.0 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 1,493.0 |  | 1,205.0 |  | 1,010.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 580.0 |  | (30.0) |  | 655.0 |
Net income |  | 641.0 | 854.0 | 449.0 | 503.0 | 1,312.0 | 665.0 | 390.0 | 632.0 | 2,447.0 |  | 2,999.0 |  | 2,123.0 |
Investment in equity method investees |  | 1,278.0 |  |  |  | 1,544.0 |  |  |  | 1,278.0 |  | 1,544.0 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 4,405.0 |  | 5,909.0 |  | 6,125.0 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 4,254.0 |  | 5,504.0 |  | 6,085.0 |
Total assets |  | 77,914.0 |  |  |  | 76,585.0 |  |  |  | 77,914.0 |  | 76,585.0 |  |  |
Total assets |  | 77,914.0 |  |  |  | 76,585.0 |  |  |  | 77,914.0 |  | 76,585.0 |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | 532.0 | 423.0 | 459.0 | 526.0 | 501.0 | 401.0 | 422.0 | 490.0 | 1,940.0 | [2] | 1,814.0 | [2] | 1,638.0 | [2]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 244.0 |  | 227.0 |  | 204.0 |
Impairment of assets and related charges |  | 219.0 |  |  |  |  |  |  |  | 346.0 |  | 16.0 |  |  |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | (119.0) |  | (70.0) |  | (45.0) |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 24.0 |  | 21.0 |  | 21.0 |
Interest income |  |  |  |  |  |  |  |  |  | 2.0 |  | 2.0 |  | 1.0 |
Interest and related charges | [2] |  |  |  |  |  |  |  |  | 105.0 |  | 97.0 |  | 94.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 86.0 |  | 51.0 |  | 215.0 |
Net income |  | (16.0) | 136.0 | 15.0 | 166.0 | 313.0 | 117.0 | 77.0 | 108.0 | 301.0 |  | 615.0 |  | 392.0 |
Investment in equity method investees |  | 91.0 |  |  |  | 95.0 |  |  |  | 91.0 |  | 95.0 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 772.0 |  | 778.0 |  | 854.0 |
Total assets |  | 12,351.0 |  |  |  | 11,940.0 |  |  |  | 12,351.0 |  | 11,940.0 |  |  |
Total assets |  | 12,351.0 |  |  |  | 11,940.0 |  |  |  | 12,351.0 |  | 11,940.0 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | 1,810.0 | 2,232.0 | 1,829.0 | 1,748.0 | 1,824.0 | 2,154.0 | 1,747.0 | 1,831.0 | 7,619.0 | [3] | 7,556.0 | [3] | 7,588.0 | [3]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,132.0 |  | 1,141.0 |  | 1,025.0 |
Interest income |  |  |  |  |  |  |  |  |  | 10.0 |  | 19.0 |  |  |
Interest and related charges | [3] |  |  |  |  |  |  |  |  | 511.0 |  | 494.0 |  | 461.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 300.0 |  | 774.0 |  | 727.0 |
Net income |  | 239.0 | $ 520.0 | $ 339.0 | $ 184.0 | 407.0 | $ 459.0 | $ 318.0 | $ 356.0 | 1,282.0 |  | 1,540.0 |  | 1,218.0 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 2,542.0 |  | 2,729.0 |  | 2,649.0 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 2,228.0 |  | 2,496.0 |  | 2,489.0 |
Total assets |  | 36,880.0 |  |  |  | 35,139.0 |  |  |  | 36,880.0 |  | 35,139.0 |  |  |
Total assets |  | 36,880.0 |  |  |  | 35,139.0 |  |  |  | 36,880.0 |  | 35,139.0 |  |  |
Gas Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 4,221.0 |  | 2,832.0 |  | 2,069.0 |
Gas Infrastructure | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 1,940.0 |  | 1,814.0 |  | 1,638.0 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 244.0 |  | 227.0 |  | 214.0 |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 5.0 |  | 15.0 |  |  |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | (119.0) |  | (70.0) |  | (45.0) |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 24.0 |  | 21.0 |  | 21.0 |
Interest income |  |  |  |  |  |  |  |  |  | 2.0 |  | 2.0 |  | 1.0 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 104.0 |  | 97.0 |  | 92.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 188.0 |  | 256.0 |  | 237.0 |
Net income |  |  |  |  |  |  |  |  |  | 552.0 |  | 436.0 |  | 395.0 |
Investment in equity method investees |  | 91.0 |  |  |  | 95.0 |  |  |  | 91.0 |  | 95.0 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 772.0 |  | 778.0 |  | 854.0 |
Total assets |  | 11,800.0 |  |  |  | 11,300.0 |  |  |  | 11,800.0 |  | 11,300.0 |  |  |
Total assets |  | 11,800.0 |  |  |  | 11,300.0 |  |  |  | 11,800.0 |  | 11,300.0 |  |  |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (208.0) |  | 16.0 |  | (7.0) |
Corporate and Other | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  | (10.0) |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 341.0 |  | 1.0 |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 1.0 |  |  |  | 2.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (102.0) |  | (205.0) |  | (22.0) |
Net income |  |  |  |  |  |  |  |  |  | (251.0) |  | 179.0 |  | (3.0) |
Total assets |  | 600.0 |  |  |  | 600.0 |  |  |  | 600.0 |  | 600.0 |  |  |
Total assets |  | 600.0 |  |  |  | 600.0 |  |  |  | 600.0 |  | 600.0 |  |  |
Power Delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,206.0 |  | 2,206.0 |  | 2,210.0 |
Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 7,104.0 |  | 6,676.0 |  | 6,747.0 |
Adjustments & Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 43.0 |  | 856.0 |  | 718.0 |
Adjustments & Eliminations | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | (4.0) |  | (3.0) |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | (4.0) |  | (3.0) |  | (2.0) |
Total assets |  | (0.1) |  |  |  | (0.1) |  |  |  | (0.1) |  | (0.1) |  |  |
Total assets |  | (0.1) |  |  |  | (0.1) |  |  |  | (0.1) |  | (0.1) |  |  |
Intersegment revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (735.0) |  | (1,476.0) |  | (1,339.0) |
Intersegment revenue | Gas Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 27.0 |  | 834.0 |  | 697.0 |
Intersegment revenue | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 674.0 |  | 610.0 |  | 609.0 |
Intersegment revenue | Power Delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 23.0 |  | 22.0 |  | 23.0 |
Intersegment revenue | Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 11.0 |  | 10.0 |  | 10.0 |
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (692.0) |  | (620.0) |  | (621.0) |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 13,366.0 |  | 12,586.0 |  | 11,737.0 |
Operating Segments | Gas Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 4,248.0 |  | 3,666.0 |  | 2,766.0 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 615.0 |  | 522.0 |  | 330.0 |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 8.0 |  |  |  |  |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | (186.0) |  | (147.0) |  | (44.0) |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 178.0 |  | 159.0 |  | 105.0 |
Interest income |  |  |  |  |  |  |  |  |  | 64.0 |  | 45.0 |  | 34.0 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 268.0 |  | 109.0 |  | 38.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 330.0 |  | 487.0 |  | 431.0 |
Net income |  |  |  |  |  |  |  |  |  | 1,214.0 |  | 898.0 |  | 726.0 |
Investment in equity method investees |  | 1,159.0 |  |  |  | 1,422.0 |  |  |  | 1,159.0 |  | 1,422.0 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,415.0 |  | 2,149.0 |  | 2,322.0 |
Total assets |  | 31,500.0 |  |  |  | 28,000.0 |  |  |  | 31,500.0 |  | 28,000.0 |  |  |
Total assets |  | 31,500.0 |  |  |  | 28,000.0 |  |  |  | 31,500.0 |  | 28,000.0 |  |  |
Operating Segments | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 466.0 |  | 626.0 |  | 602.0 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 14.0 |  | 43.0 |  | 30.0 |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 394.0 |  | 15.0 |  | 4.0 |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | (200.0) |  |  |  |  |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 1.0 |  | 4.0 |  | 22.0 |
Interest income |  |  |  |  |  |  |  |  |  | 126.0 |  | 96.0 |  | 36.0 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 782.0 |  | 644.0 |  | 516.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (204.0) |  | (1,224.0) |  | (363.0) |
Net income |  |  |  |  |  |  |  |  |  | (608.0) |  | 389.0 |  | (484.0) |
Investment in equity method investees |  | 37.0 |  |  |  | 41.0 |  |  |  | 37.0 |  | 41.0 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 105.0 |  | 52.0 |  | 43.0 |
Total assets |  | 11,200.0 |  |  |  | 12,000.0 |  |  |  | 11,200.0 |  | 12,000.0 |  |  |
Total assets |  | 11,200.0 |  |  |  | 12,000.0 |  |  |  | 11,200.0 |  | 12,000.0 |  |  |
Operating Segments | Corporate and Other | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | (215.0) |  |  |  | (19.0) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (25.0) |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 5.0 |  | 3.0 |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (78.0) |  | (94.0) |  | (104.0) |
Net income |  |  |  |  |  |  |  |  |  | (312.0) |  | 74.0 |  | (173.0) |
Operating Segments | Power Delivery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,229.0 |  | 2,228.0 |  | 2,233.0 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 625.0 |  | 593.0 |  | 537.0 |
Interest income |  |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 265.0 |  | 265.0 |  | 244.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 160.0 |  | 334.0 |  | 308.0 |
Net income |  |  |  |  |  |  |  |  |  | 587.0 |  | 531.0 |  | 484.0 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,564.0 |  | 1,433.0 |  | 1,320.0 |
Total assets |  | 17,800.0 |  |  |  | 16,700.0 |  |  |  | 17,800.0 |  | 16,700.0 |  |  |
Total assets |  | 17,800.0 |  |  |  | 16,700.0 |  |  |  | 17,800.0 |  | 16,700.0 |  |  |
Operating Segments | Power Delivery | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 2,204.0 |  | 2,212.0 |  | 2,217.0 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 624.0 |  | 594.0 |  | 537.0 |
Interest income |  |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 265.0 |  | 265.0 |  | 244.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 158.0 |  | 334.0 |  | 307.0 |
Net income |  |  |  |  |  |  |  |  |  | 586.0 |  | 527.0 |  | 482.0 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,539.0 |  | 1,439.0 |  | 1,313.0 |
Total assets |  | 17.6 |  |  |  | 16.6 |  |  |  | 17.6 |  | 16.6 |  |  |
Total assets |  | 17.6 |  |  |  | 16.6 |  |  |  | 17.6 |  | 16.6 |  |  |
Operating Segments | Power Generation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 7,115.0 |  | 6,686.0 |  | 6,757.0 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 746.0 |  | 747.0 |  | 662.0 |
Impairment of assets and related charges |  |  |  |  |  |  |  |  |  | 1.0 |  |  |  |  |
Gains on sales of assets |  |  |  |  |  |  |  |  |  | 6.0 |  |  |  | 4.0 |
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  |  | 18.0 |  | (181.0) |  | (16.0) |
Interest income |  |  |  |  |  |  |  |  |  | 90.0 |  | 92.0 |  | 74.0 |
Interest and related charges |  |  |  |  |  |  |  |  |  | 374.0 |  | 342.0 |  | 290.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 294.0 |  | 373.0 |  | 279.0 |
Net income |  |  |  |  |  |  |  |  |  | 1,254.0 |  | 1,181.0 |  | 1,397.0 |
Investment in equity method investees |  | 82.0 |  |  |  | 81.0 |  |  |  | 82.0 |  | 81.0 |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,321.0 |  | 2,275.0 |  | 2,440.0 |
Total assets |  | 28,200.0 |  |  |  | 29,000.0 |  |  |  | 28,200.0 |  | 29,000.0 |  |  |
Total assets |  | 28,200.0 |  |  |  | 29,000.0 |  |  |  | 28,200.0 |  | 29,000.0 |  |  |
Operating Segments | Power Generation | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | 5,630.0 |  | 5,344.0 |  | 5,390.0 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 533.0 |  | 547.0 |  | 488.0 |
Interest income |  |  |  |  |  |  |  |  |  | 9.0 |  | 15.0 |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 250.0 |  | 232.0 |  | 219.0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 220.0 |  | 534.0 |  | 524.0 |
Net income |  |  |  |  |  |  |  |  |  | 1,008.0 |  | 939.0 |  | 909.0 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,003.0 |  | 1,290.0 |  | $ 1,336.0 |
Total assets |  | 19.4 |  |  |  | 18.6 |  |  |  | 19.4 |  | 18.6 |  |  |
Total assets |  | $ 19.4 |  |  |  | $ 18.6 |  |  |  | $ 19.4 |  | $ 18.6 |  |  |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 24 for amounts attributable to related parties.
[3] | See Note 24 for amounts attributable to affiliates.

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