XML 39 R16.htm IDEA: XBRL DOCUMENT v3.22.0.1
Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Note 9 Property, Plant and Equipment
Property, plant and equipment in service and under construction, and related accumulated depreciation and amortization, as of December 31, 2021 and 2020, were as follows:
December 31,Useful Lives (Years)20212020
(Dollars in millions)   
Land N/A $37 $34 
Buildings20293 295 
Leasehold and land improvements 1-30 1,442 1,369 
Cell site equipment 7-25 4,150 4,018 
Switching equipment 5-8 1,095 1,094 
Office furniture and equipment 3-5 252 282 
Other operating assets and equipment 3-5 47 49 
System development 1-7 1,479 1,327 
Work in process N/A 261 317 
Total property, plant and equipment, gross 9,056 8,785 
Accumulated depreciation and amortization (6,450)(6,319)
Total property, plant and equipment, net $2,606 $2,466 
Depreciation and amortization expense totaled $662 million, $669 million and $689 million in 2021, 2020 and 2019, respectively. In 2021, 2020 and 2019, (Gain) loss on asset disposals, net included charges of $23 million, $25 million and $19 million, respectively, related to disposals of assets, trade-ins of older assets for replacement assets and other retirements of assets from service in the normal course of business.