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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
LIFO Method Related Items [Abstract]    
LIFO Inventory Amount $ 168 $ 177
Average Cost Method, Difference 31 31
Inventory, Net [Abstract]    
Finished products and parts 1,821 1,547
Raw materials and supplies 890 703
Work in process 176 146
Inventory, net 2,887 2,396
Obsolescence reserves $ 247 $ 276