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Property, Plant and Equipment (Table)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
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