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PROPERTY AND EQUIPMENT
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT
4. PROPERTY AND EQUIPMENT:
 
Property and equipment are stated at cost, less accumulated depreciation. Depreciation is generally computed under the straight-line method over the following estimated useful lives:
 
Buildings and improvements 
10 - 30 years
Operating equipment 
5 - 10 years
Office furniture and equipment 
5 - 10 years
Leasehold improvements 
Lesser of 10 - 30 years or lease term
Automotive equipment 
3 - 5 years
Property and equipment under finance leases Lease term
 
Acquired property and equipment is depreciated on a straight-line basis over the respective estimated remaining useful lives.
 
Property and equipment consisted of the following as of December 31, 2021 and 2020 (in millions):
 
 20212020
Land and improvements$72 $74 
Real estate held for development and sale21 25 
Buildings and improvements308 307 
Operating equipment973 939 
Office furniture and equipment129 123 
Leasehold improvements60 59 
Automotive equipment63 66 
Finance lease assets61 59 
Construction in progress34 36 
 1,721 1,688 
Less: accumulated depreciation(888)(865)
 $833 $823