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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
LIFO Method Related Items [Abstract]    
LIFO Inventory Amount $ 109 $ 138
Average Cost Method, Difference 19 18
Inventory, Net [Abstract]    
Finished products and parts 1,528 1,992
Raw materials and supplies 836 879
Work in process 111 122
Inventory, net 2,475 2,993
Obsolescence reserves $ 240 $ 251