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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Note 10 Property, Plant and Equipment
Property, plant and equipment in service and under construction, and related accumulated depreciation and amortization, as of December 31, 2024 and 2023, were as follows:
December 31,Useful Lives (Years)20242023
(Dollars in millions)   
Land N/A $47 $41 
Buildings20279 281 
Leasehold and land improvements
 1-30
1,631 1,570 
Cell site equipment
 7-30
3,492 4,381 
Switching equipment
 5-8
692 1,090 
Office furniture and equipment
 3-5
179 193 
Other operating assets and equipment
 3-5
47 47 
System development
 1-7
1,846 1,790 
Work in process N/A 174 167 
Total property, plant and equipment, gross 8,387 9,560 
Accumulated depreciation and amortization (5,885)(6,984)
Total property, plant and equipment, net $2,502 $2,576 
Depreciation and amortization expense totaled $644 million, $637 million and $682 million in 2024, 2023 and 2022, respectively.