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Property, Plant and Equipment (Table) | 12 Months Ended
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Dec. 31, 2016
Disclosure [Text Block] |
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

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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://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 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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