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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Accounting Policies [Abstract] |
Schedule of Checks Outstanding but Not Yet Presented for Payment | The following table illustrates the checks outstanding but not yet presented for payment and recorded in accounts payable for the Companies:
Year Ended December 31, | 2016 | 2015
(millions) |  |
Dominion | $24 | $27
Virginia Power | 11 | 11
Dominion Gas | 9 | 7
Schedule of Depreciation Rates | The Companies' average composite depreciation rates on utility property, plant and equipment are as follows:
Year Ended December 31, | 2016 | 2015 | 2014
(percent) |  |  |
Dominion |  |  |
Generation | 2.83 | 2.78 | 2.66
Transmission | 2.47 | 2.42 | 2.38
Distribution | 3.02 | 3.11 | 3.12
Storage | 2.29 | 2.42 | 2.39
Gas gathering and processing | 2.66 | 3.19 | 2.81
General and other | 4.12 | 3.67 | 3.62
Virginia Power |  |  |
Generation | 2.83 | 2.78 | 2.66
Transmission | 2.36 | 2.33 | 2.34
Distribution | 3.32 | 3.33 | 3.34
General and other | 3.49 | 3.40 | 3.29
Dominion Gas |  |  |
Transmission | 2.43 | 2.46 | 2.40
Distribution | 2.55 | 2.45 | 2.47
Storage | 2.19 | 2.44 | 2.40
Gas gathering and processing | 2.58 | 3.20 | 2.82
General and other | 4.54 | 4.72 | 5.77
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 |

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