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Property, Plant and Equipment (Property, Plant and Equipment) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Utility: |  |
Generation | $ 17,602 | $ 17,147
Transmission | 15,335 | 14,315
Distribution | 17,408 | 16,381
Storage | 2,887 | 2,814
Nuclear fuel | 1,599 | 1,537
Gas gathering and processing | 219 | 216
Oil and gas | 1,720 | 1,652
General and other | 1,514 | 1,450
Plant under construction | 7,765 | 6,254
Total utility | 66,049 | 61,766
Nonutility: |  |
Merchant generation-nuclear | 1,452 | 1,419
Merchant generation-other | 4,992 | 4,149
Nuclear fuel | 968 | 897
Gas Gathering and Processing | 630 | 619
Other-including plant under construction | 732 | 706
Total nonutility | 8,774 | 7,790
Total property, plant and equipment | 74,823 | 69,556
Virginia Electric and Power Company |  |
Utility: |  |
Generation | 17,602 | 17,147
Transmission | 8,332 | 7,871
Distribution | 11,151 | 10,573
Nuclear fuel | 1,599 | 1,537
General and other | 794 | 745
Plant under construction | 2,840 | 2,146
Total utility | 42,318 | 40,019
Nonutility: |  |
Other-including plant under construction | 11 | 11
Total property, plant and equipment | 42,329 | 40,030
Dominion Energy Gas Holdings, LLC |  |
Utility: |  |
Transmission | 4,732 | 4,231
Distribution | 3,267 | 3,019
Storage | 1,688 | 1,627
Gas gathering and processing | 202 | 198
General and other | 216 | 184
Plant under construction | 293 | 448
Total utility | 10,398 | 9,707
Nonutility: |  |
Gas Gathering and Processing | 630 | 619
Other-including plant under construction | 145 | 149
Total nonutility | 775 | 768
Total property, plant and equipment | $ 11,173 | $ 10,475

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