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Property, Plant and Equipment | 12 Months Ended
--- | ---
Dec. 31, 2016
Property, Plant and Equipment, Net [Abstract] |
Property, Plant and Equipment | P ROPERTY, P LANT AND E QUIPMENT 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 |
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.
The co-owners are obligated to pay their share of all future construction expenditures and operating costs of the jointly-owned facilities in the same proportion as their respective ownership interest. Dominion and Virginia Power report their share of operating costs in the appropriate operating expense (electric fuel and other energy-related purchases, other operations and maintenance, depreciation, depletion and amortization and other taxes, etc.) in the Consolidated Statements of Income. Assignments of Shale Development Rights In December 2013, Dominion Gas closed on agreements with two natural gas producers to convey over time approximately 100,000 acres of Marcellus Shale development rights underneath several of its natural gas storage fields. The agreements provide for payments to Dominion Gas, subject to customary adjustments, of approximately $200 million over a period of nine years, and an overriding royalty interest in gas produced from the acreage. In 2013, Dominion Gas received approximately $100 million in cash proceeds, resulting in a $20 million ($12 million after-tax) gain, recorded to operations and maintenance expense in Dominion Gas' Consolidated Statements of Income. In 2014, Dominion Gas received $16 million in additional cash proceeds resulting from post-closing adjustments. In March 2015, Dominion Gas and one of the natural gas producers closed on an amendment to the agreement, which included the immediate conveyance of approximately 9,000 acres of Marcellus Shale development rights and a two-year extension of the term of the original agreement. The conveyance of development rights resulted in the recognition of $43 million ($27 million after-tax) of previously deferred revenue to operations and maintenance expense in Dominion Gas' Consolidated Statements of Income. In April 2016, Dominion Gas and the natural gas producer closed on an amendment to the agreement, which included the immediate conveyance of a 32% partial interest in the remaining approximately 70,000 acres. This conveyance resulted in the recognition of the remaining $35 million ($21 million after-tax) of previously deferred revenue to operations and maintenance expense in Dominion Gas’ Consolidated Statements of Income. In November 2014, Dominion Gas closed an agreement with a natural gas producer to convey over time approximately 24,000 acres of Marcellus Shale development rights underneath one of its natural gas storage fields. The agreement provides for payments to Dominion Gas, subject to customary adjustments, of approximately $120 million over a period of four years, and an overriding royalty interest in gas produced from the acreage. In November 2014, Dominion Gas closed on the agreement and received proceeds of $60 million associated with an initial conveyance of approximately 12,000 acres, resulting in a $60 million ($36 million after-tax) gain, recorded to operations and maintenance expense in Dominion Gas' Consolidated Statements of Income. In connection with that agreement, in 2016, Dominion Gas conveyed approximately 4,000 acres of Marcellus Shale development rights and received proceeds of $10 million and an overriding royalty interest in gas produced from the acreage. These transactions resulted in a $10 million ($6 million after-tax) gain. The gains are included in other operations and maintenance expense in Dominion Gas' Consolidated Statements of Income. In March 2015, Dominion Gas conveyed to a natural gas producer approximately 11,000 acres of Marcellus Shale development rights underneath one of its natural gas storage fields and received proceeds of $27 million and an overriding royalty interest in gas produced from the acreage. This transaction resulted in a $27 million ($16 million after-tax) gain, included in other operations and maintenance expense in Dominion Gas' Consolidated Statements of Income. In September 2015, Dominion Gas closed on an agreement with a natural gas producer to convey approximately 16,000 acres of Utica and Point Pleasant Shale development rights underneath one of its natural gas storage fields. The agreement provided for a payment to Dominion Gas, subject to customary adjustments, of $52 million and an overriding royalty interest in gas produced from the acreage. In September 2015, Dominion Gas received proceeds of $52 million associated with the conveyance of the acreage, resulting in a $52 million ($29 million after-tax) gain, included in other operations and maintenance expense in Dominion Gas’ Consolidated Statements of Income.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + 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 210.5-02.13-14) -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 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: 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 + Details
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