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Inventories, net - Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 637 $ 614
Work in process 522 501
Finished goods and purchased products 2,606 2,505
Inventory, Gross 3,765 3,620
Less: Inventory reserve (907) (634)
Total $ 2,858 $ 2,986