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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2016
Property, Plant and Equipment, Net [Abstract] |
Property, Plant and Equipment | Dominion's nonutility property, plant and equipment is depreciated using the straight-line method over the following estimated useful lives:
Asset | Estimated Useful Lives
Merchant generation-nuclear | 44 years
Merchant generation-other | 15-36 years
Nonutility gas gathering and processing | 3-50 years
General and other | 5-59 years
Major classes of property, plant and equipment and their respective balances for the Companies are as follows:
At December 31, | 2016 |  | 2015 |
(millions) |  |
Dominion |  |
Utility: |  |
Generation | $ | 17,147 |  | $ | 15,656 |
Transmission | 14,315 |  | 11,461 |
Distribution | 16,381 |  | 13,128 |
Storage | 2,814 |  | 2,460 |
Nuclear fuel | 1,537 |  | 1,464 |
Gas gathering and processing | 216 |  | 799 |
Oil and gas | 1,652 |  | — |
General and other | 1,450 |  | 927 |
Plant under construction | 6,254 |  | 5,550 |
Total utility | 61,766 |  | 51,445 |
Nonutility: |  |  |  |
Merchant generation-nuclear | 1,419 |  | 1,339 |
Merchant generation-other | 4,149 |  | 2,683 |
Nuclear fuel | 897 |  | 938 |
Gas gathering and processing | 619 |  | — |
Other-including plant under construction | 706 |  | 1,371 |
Total nonutility | 7,790 |  | 6,331 |
Total property, plant and equipment | $ | 69,556 |  | $ | 57,776 |
Virginia Power |  |  |  |
Utility: |  |  |  |
Generation | $ | 17,147 |  | $ | 15,656 |
Transmission | 7,871 |  | 6,963 |
Distribution | 10,573 |  | 10,048 |
Nuclear fuel | 1,537 |  | 1,464 |
General and other | 745 |  | 709 |
Plant under construction | 2,146 |  | 2,793 |
Total utility | 40,019 |  | 37,633 |
Nonutility-other | 11 |  | 6 |
Total property, plant and equipment | $ | 40,030 |  | $ | 37,639 |
Dominion Gas |  |
Utility: |  |
Transmission | $ | 4,231 |  | $ | 3,804 |
Distribution | 3,019 |  | 2,765 |
Storage | 1,627 |  | 1,583 |
Gas gathering and processing | 198 |  | 797 |
General and other | 184 |  | 165 |
Plant under construction | 448 |  | 443 |
Total utility | 9,707 |  | 9,557 |
Nonutility: |  |  |  |
Gas gathering and processing | $ | 619 |  | $ | — |
Other-including plant under construction | 149 |  | 136 |
Total nonutility | 768 |  | 136 |
Total property, plant and equipment | $ | 10,475 |  | $ | 9,693 |
Share of Jointly-Owned Power Stations | Dominion's and Virginia Power's proportionate share of jointly-owned power stations at December 31, 2016 is as follows:
| Bath County Pumped Storage Station(1) |  | North Anna Units 1 and 2(1) |  | Clover Power Station(1) |  | Millstone Unit 3(2) |
(millions, except percentages) |  |  |  |
Ownership interest | 60 | % | 88.4 | % | 50 | % | 93.5 | %
Plant in service | $ | 1,052 |  | $ | 2,520 |  | $ | 586 |  | $ | 1,190 |
Accumulated depreciation | (585 | ) | (1,210 | ) | (219 | ) | (349 | )
Nuclear fuel | — |  | 718 |  | — |  | 469 |
Accumulated amortization of nuclear fuel | — |  | (549 | ) | — |  | (366 | )
Plant under construction | 8 |  | 69 |  | 4 |  | 51 |
(1) | Units jointly owned by Virginia Power.
(2) | Unit jointly owned by Dominion.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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