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Property, plant and equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, plant and equipment | Property, plant and equipment Property, plant and equipment consisted of the following (dollar amounts in millions):
|  |  | December 31,
| Useful life (in years) |  | 2017 |  | 2016
Land | — |  |  | $ | 283 |  |  | $ | 295 |
Buildings and improvements | 10-40 |  |  | 3,507 |  |  | 3,640 |
Manufacturing equipment | 8-12 |  |  | 2,372 |  |  | 2,275 |
Laboratory equipment | 8-12 |  |  | 1,179 |  |  | 1,092 |
Other | 3-15 |  |  | 4,404 |  |  | 4,380 |
Construction in progress | — |  |  | 834 |  |  | 745 |
Property, plant and equipment, gross |  |  | 12,579 |  |  | 12,427 |
Less accumulated depreciation and amortization |  |  | (7,590 | ) |  | (7,466 | )
Property, plant and equipment, net |  |  | $ | 4,989 |  |  | $ | 4,961 |
During the years ended December 31, 2017, 2016 and 2015, we recognized depreciation and amortization expense associated with our property, plant and equipment of $604 million, $619 million and $727 million, respectively.

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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 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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