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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, including owned assets and assets subject to finance leases, consisted of the following as of December 31, 2022 and 2021 (in millions):
20222021
Vehicles$10,628 $10,018 
Aircraft22,598 21,973 
Land2,140 2,140 
Buildings6,032 5,802 
Building and leasehold improvements5,067 5,010 
Plant equipment16,145 15,650 
Technology equipment2,411 2,798 
Construction-in-progress2,409 1,418 
67,430 64,809 
Less: Accumulated depreciation and amortization(32,711)(31,334)
Property, Plant and Equipment, Net$34,719 $33,475 
Property, plant and equipment purchased on account was $176 and $248 million as of December 31, 2022 and 2021, respectively. 
There were no material impairment charges during the year ended December 31, 2022. We recognized impairment charges of $71 million during the year ended December 31, 2021, due to the reevaluation of certain facility projects.
During 2022, we reduced the estimated residual value of our MD-11 aircraft to zero, incurring a one-time charge on our fully-depreciated aircraft during the fourth quarter. This resulted in an increase in depreciation expense of $76 million, and a decrease in net income of $58 million, or $0.07 per share on a basic and diluted basis. The change in estimate for the remainder of our MD-11 fleet will be accounted for prospectively.