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Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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LIFO Method Related Items [Abstract] |  |
LIFO Inventory Amount | $ 189 | $ 186
Average Cost Method, Difference | 24 | 24
Inventory, Net [Abstract] |  |
Finished products and parts | 2,063 | 1,947
Raw materials and supplies | 1,047 | 934
Work in process | 154 | 147
Inventory, net | 3,264 | 3,028
Obsolescence reserves | $ 207 | $ 219

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- Definition Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. + 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 210.5-02.6(a)(4),(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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