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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2018
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, 2018 and 2017 (in millions):
| 2018 |  | 2017
Vehicles | $ | 9,820 |  |  | $ | 9,365 |
Aircraft | 17,499 |  |  | 16,248 |
Land | 2,000 |  |  | 1,582 |
Buildings | 4,808 |  |  | 4,035 |
Building and leasehold improvements | 4,323 |  |  | 3,934 |
Plant equipment | 11,833 |  |  | 9,387 |
Technology equipment | 2,093 |  |  | 1,907 |
Equipment under operating leases | — |  |  | 29 |
Construction-in-progress | 2,112 |  |  | 2,239 |
| 54,488 |  |  | 48,726 |
Less: Accumulated depreciation and amortization | (27,912 | ) |  | (26,608 | )
| $ | 26,576 |  |  | $ | 22,118 |
As part of our ongoing investment in transformation, in 2018 we made prospective revisions to our estimates of useful lives for building improvements, vehicles and plant equipment which in general had the effect of lengthening the useful lives of these categories. This resulted in a decrease in depreciation expense and an increase in operating income of $286 million and an increase to net income of $228 million or $0.26 per share on a basic and diluted basis. Separately, capital investments in additional property, plant and equipment, net of disposals and fully-depreciated assets, resulted in an increase in depreciation expense of $257 million and a decrease to net income of $205 million or $0.24 per share on a basic and diluted basis in 2018. Combining both impacts resulted in a net decrease of $29 million to depreciation expense, and an increase to net income of $23 million or $0.03 per share on both a basic and diluted basis in 2018. 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 2018, 2017 or 2016.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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