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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 were composed of the following:
| December 31
Millions of dollars | 2017 | 2016
Land | $ | 248 |  | $ | 228 |
Buildings and property improvements | 3,460 |  | 3,399 |
Machinery, equipment and other | 17,062 |  | 16,103 |
Total | 20,770 |  | 19,730 |
Less accumulated depreciation | 12,249 |  | 11,198 |
Net property, plant and equipment | $ | 8,521 |  | $ | 8,532 |
Percentages of building and property improvements, and total machinery, and equipment and other, excluding oil and natural gas investments, depreciated over useful lives | Classes of assets are depreciated over the following useful lives:
| Buildings and Property Improvements
| 2017 | 2016
1 - 10 years | 11% | 11%
11 - 20 years | 42% | 42%
21 - 30 years | 22% | 22%
31 - 40 years | 25% | 25%
| Machinery, Equipment and Other
| 2017 | 2016
1 - 5 years | 35% | 34%
6 - 10 years | 56% | 57%
11 - 20 years | 9% | 9%

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- Definition Tabular disclosure of the percentages that building and property improvements, total machinery, equipment and other, excluding oil and natural gas investments, are depreciated over their useful lives. + References No definition available. + Details
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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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