Inventories (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
LIFO method related items [Abstract]
LIFO inventory amount	$ 205	$ 160
LIFO reserve	40	36
Inventories, net [Abstract]
Finished products and parts	2,050	1,801
Raw materials and supplies	764	673
Work in process	102	96
Total	2,916	2,570
Obsolescence reserves	$ 111	$ 108