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Property, Plant and Equipment (Tables) | 12 Months Ended
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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) |  | 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 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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