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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Note 9 Property, Plant and Equipment Property, plant and equipment in service and under construction, and related accumulated depreciation and amortization, as of December 31, 2019 and 2018, were as follows:
December 31, | Useful Lives (Years) |  | 2019 |  | 2018
(Dollars in millions) |  |  |  |  |  |  |
Land | N/A |  | $ | 35 |  |  | $ | 35 |
Buildings | 20 |  | 295 |  |  | 296 |
Leasehold and land improvements | 1-30 |  | 1,280 |  |  | 1,210 |
Cell site equipment | 7-25 |  | 3,708 |  |  | 3,460 |
Switching equipment | 5-8 |  | 1,051 |  |  | 1,018 |
Office furniture and equipment | 3-5 |  | 280 |  |  | 285 |
Other operating assets and equipment | 3-5 |  | 48 |  |  | 51 |
System development | 1-7 |  | 1,238 |  |  | 1,149 |
Work in process | N/A |  | 358 |  |  | 274 |
Total property, plant and equipment, gross |  |  | 8,293 |  |  | 7,778 |
Accumulated depreciation and amortization |  |  | (6,086 | ) |  | (5,576 | )
Total property, plant and equipment, net |  |  | $ | 2,207 |  |  | $ | 2,202 |
Depreciation and amortization expense totaled $689 million, $627 million and $604 million in 2019, 2018 and 2017, respectively. In 2019, 2018 and 2017, (Gain) loss on asset disposals, net included charges of $19 million, $10 million and $17 million, respectively, related to disposals of assets, trade-ins of older assets for replacement assets and other retirements of assets from service in the normal course of business.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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