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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
LIFO Method Related Items [Abstract]    
LIFO Inventory Amount $ 135 $ 133
Average Cost Method, Difference 18 16
Inventory, Net [Abstract]    
Finished products and parts 1,448 1,388
Raw materials and supplies 713 778
Work in process 134 109
Inventory, net 2,295 2,275
Obsolescence reserves $ 265 $ 263