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Property, Plant and Equipment | 12 Months Ended
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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) |  | 2024 |  | 2023
(Dollars in millions) |  |  |  |  |
Land | N/A |  | $ | 47 |  |  | $ | 41 |
Buildings | 20 |  | 279 |  |  | 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.

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