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Property, Plant & Equipment (Tables) | 6 Months Ended
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Jun. 30, 2018
Property, Plant and Equipment [Abstract] |
Summary of Property, Plant and Equipment | The following table summarizes our property, plant and equipment as of June 30, 2018 and December 31, 2017:
Millions of dollars |  | June 30, 2018 |  | December 31, 2017
Land |  | $ | 117 |  |  | $ | 123 |
Buildings |  | 1,655 |  |  | 1,789 |
Machinery and equipment |  | 7,750 |  |  | 8,946 |
Accumulated depreciation |  | (6,095 | ) |  | (6,825 | )
Property, plant and equipment, net |  | $ | 3,427 |  |  | $ | 4,033 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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