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Inventories (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
LIFO Method Related Items [Abstract] |  |
LIFO Inventory Amount | $ 177 | $ 186
Average Cost Method, Difference | 12 | 24
Inventory, Net [Abstract] |  |
Finished products and parts | 2,122 | 1,947
Raw materials and supplies | 1,114 | 934
Work in process | 144 | 147
Inventory, net | $ 3,380 | 3,028
Increase (Decrease) in Inventory, Percentage | 12.00% |
Obsolescence reserves | $ 179 | $ 219

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