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PROPERTY, PLANT AND EQUIPMENT | 9 Months Ended
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Sep. 30, 2018
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment as of September 30, 2018 and December 31, 2017 consists of the following (in millions):
| 2018 |  | 2017
Vehicles | $ | 9,500 |  |  | $ | 9,365 |
Aircraft | 17,245 |  |  | 16,248 |
Land | 1,783 |  |  | 1,582 |
Buildings | 4,615 |  |  | 4,035 |
Building and leasehold improvements | 4,095 |  |  | 3,934 |
Plant equipment | 10,054 |  |  | 9,387 |
Technology equipment | 2,062 |  |  | 1,907 |
Equipment under operating leases | — |  |  | 29 |
Construction-in-progress | 3,692 |  |  | 2,239 |
| 53,046 |  |  | 48,726 |
Less: Accumulated depreciation and amortization | (27,667 | ) |  | (26,608 | )
| $ | 25,379 |  |  | $ | 22,118 |
We continually monitor our aircraft fleet utilization in light of current and projected volume levels, aircraft fuel prices and other factors. Additionally, we monitor all 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 during the three or nine months ended September 30, 2018 or 2017.

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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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