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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2023
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, 2023 and 2022, were as follows:
December 31,Useful Lives (Years)20232022
(Dollars in millions)   
Land N/A $41 $37 
Buildings20281 281 
Leasehold and land improvements
 1-30
1,570 1,504 
Cell site equipment
 7-30
4,381 4,247 
Switching equipment
 5-8
1,090 1,115 
Office furniture and equipment
 3-5
193 209 
Other operating assets and equipment
 3-5
47 47 
System development
 1-7
1,790 1,676 
Work in process N/A 167 218 
Total property, plant and equipment, gross 9,560 9,334 
Accumulated depreciation and amortization (6,984)(6,710)
Total property, plant and equipment, net $2,576 $2,624 
Depreciation and amortization expense totaled $637 million, $682 million and $662 million in 2023, 2022 and 2021, respectively.