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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
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, 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 |
Depreciation and amortization expense totaled $669 million, $689 million and $627 million in 2020, 2019 and 2018, respectively. In 2020, 2019 and 2018, (Gain) loss on asset disposals, net included charges of $25 million, $19 million and $10 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 asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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