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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
LIFO Method Related Items [Abstract]    
LIFO Inventory Amount $ 160 $ 160
Inventory, LIFO Reserve 42 36
Inventory, Net [Abstract]    
Finished products and parts 2,405 1,801
Raw materials and supplies 773 673
Work in process 119 96
Inventory, net 3,297 2,570
Obsolescence reserves $ 110 $ 108