Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
LIFO method related items [Abstract]
LIFO inventory amount	$ 120	$ 227
Inventory, LIFO reserve	0	38
Disposal Group, Including Discontinued Operation, Inventory, Current	576
Inventory, net [Abstract]
Finished products and parts	1,747	2,606
Raw materials and supplies	548	754
Work in process	122	211
Total	2,417	3,571
Obsolescence reserves	$ 218	$ 161