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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
LIFO method related items [Abstract]    
LIFO inventory amount $ 133 $ 138
Inventory, LIFO reserve 16 18
Inventory, net [Abstract]    
Finished products and parts 1,388 1,992
Raw materials and supplies 778 879
Work in process 109 122
Total 2,275 2,993
Obsolescence reserves $ 263 $ 251