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Property, Plant and Equipment (Table) | 12 Months Ended
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Dec. 31, 2020
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, 2020 and 2019, were as follows:
December 31, | Useful Lives (Years) |  | 2020 |  | 2019
(Dollars in millions) |  |  |  |  |
Land | N/A |  | $ | 34 |  |  | $ | 35 |
Buildings | 20 |  | 295 |  |  | 295 |
Leasehold and land improvements | 1-30 |  | 1,369 |  |  | 1,280 |
Cell site equipment | 7-25 |  | 4,018 |  |  | 3,708 |
Switching equipment | 5-8 |  | 1,094 |  |  | 1,051 |
Office furniture and equipment | 3-5 |  | 282 |  |  | 280 |
Other operating assets and equipment | 3-5 |  | 49 |  |  | 48 |
System development | 1-7 |  | 1,327 |  |  | 1,238 |
Work in process | N/A |  | 317 |  |  | 358 |
Total property, plant and equipment, gross |  |  | 8,785 |  |  | 8,293 |
Accumulated depreciation and amortization |  |  | (6,319) |  |  | (6,086) |
Total property, plant and equipment, net |  |  | $ | 2,466 |  |  | $ | 2,207 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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