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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
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 |

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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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