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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2016
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, 2016 and 2015 were as follows:
December 31, | Useful Lives (Years) |  | 2016 |  | 2015
(Dollars in millions) |  |  |  |  |  |  |
Land | N/A |  | $ | 35 |  | $ | 36
Buildings | 20 |  |  | 297 |  |  | 295
Leasehold and land improvements | 1-30 |  |  | 1,153 |  |  | 1,103
Cell site equipment | 7-25 |  |  | 3,383 |  |  | 3,383
Switching equipment | 5-8 |  |  | 976 |  |  | 960
Office furniture and equipment | 3-5 |  |  | 420 |  |  | 502
Other operating assets and equipment | 3-5 |  |  | 53 |  |  | 79
System development | 1-7 |  |  | 1,217 |  |  | 1,169
Work in process | N/A |  |  | 178 |  |  | 142
Total property, plant and equipment, gross |  |  |  | 7,712 |  |  | 7,669
Accumulated depreciation and amortization |  |  |  | (5,242) |  |  | (5,020)
Total property, plant and equipment, net |  |  | $ | 2,470 |  | $ | 2,649
Depreciation and amortization expense totaled $607 million, $596 million and $593 million in 2016, 2015 and 2014, respectively. In 2016, 2015 and 2014, (Gain) loss on asset disposals, net included charges of $22 million, $16 million and $21 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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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