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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment [Abstract] |
Schedule of net property, plant and equipment | Net property, plant and equipment is composed of the following:
| Depreciable Lives |  | As of December 31,
|  | 2015 |  | 2014
|  |  | (Dollars in millions)
Property, plant and equipment: |  |  |  |  |
Land | N/A |  | $ | 349 |  |  | 350 |
Fiber, conduit and other outside plant(1) | 15-45 years |  | 5,362 |  |  | 4,640 |
Central office and other network electronics(2) | 4-10 years |  | 3,614 |  |  | 3,362 |
Support assets(3) | 5-30 years |  | 2,584 |  |  | 2,496 |
Construction in progress(4) | N/A |  | 273 |  |  | 309 |
Gross property, plant and equipment |  |  | 12,182 |  |  | 11,157 |
Accumulated depreciation |  |  | (4,808 | ) |  | (3,956 | )
Net property, plant and equipment |  |  | $ | 7,374 |  |  | 7,201 |
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(1) | Fiber, conduit and other outside plant consists of fiber and metallic cable, conduit, poles and other supporting structures.
(2) | Central office and other network electronics consists of circuit and packet switches, routers, transmission electronics and electronics providing service to customers.
(3) | Support assets consist of buildings, computers and other administrative and support equipment.
(4) | Construction in progress includes inventory held for construction and property of the aforementioned categories that has not been placed in service as it is still under construction.

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -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 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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