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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2024
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, 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