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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment, including both owned assets as well as assets subject to capital leases, consists of the following as of December 31, 2017 and 2016 (in millions):
| 2017 |  | 2016
Vehicles | $ | 9,365 |  |  | $ | 8,638 |
Aircraft | 16,248 |  |  | 15,653 |
Land | 1,582 |  |  | 1,397 |
Buildings | 4,035 |  |  | 3,439 |
Building and leasehold improvements | 3,934 |  |  | 3,612 |
Plant equipment | 9,387 |  |  | 8,430 |
Technology equipment | 1,907 |  |  | 1,741 |
Equipment under operating leases | 29 |  |  | 29 |
Construction-in-progress | 2,239 |  |  | 735 |
| 48,726 |  |  | 43,674 |
Less: Accumulated depreciation and amortization | (26,608 | ) |  | (24,874 | )
| $ | 22,118 |  |  | $ | 18,800 |
We continually monitor our aircraft fleet utilization in light of current and projected volume levels, aircraft fuel prices and other factors. Additionally, we monitor our other property, plant and equipment categories for any indicators that the carrying value of the assets may not be recoverable. No impairment charges on property, plant and equipment were recorded in 2017, 2016 or 2015.

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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 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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