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Property, Plant and Equipment | 9 Months Ended
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Sep. 30, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | PROPERTY, PLANT AND EQUIPMENT The following table summarizes our property, plant and equipment at September 30, 2020 and December 31, 2019:
Millions of dollars |  | September 30, 2020 |  | December 31, 2019
Land |  | $ | 91 |  |  | $ | 97 |
Buildings |  | 1,540 |  |  | 1,540 |
Machinery and equipment |  | 8,186 |  |  | 8,108 |
Accumulated depreciation |  | (6,681) |  |  | (6,444) |
Property, plant and equipment, net |  | $ | 3,136 |  |  | $ | 3,301 |
During the nine months ended September 30, 2020, we disposed of buildings, machinery and equipment with a net book value of $20 million. The net gain on the disposals were not material.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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