v2.4.0.6
Inventories (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Inventory Disclosure [Abstract]    
Productive material, supplies and work in process $ 7,112 $ 6,486
Finished product, including service parts 8,321 7,838
Total inventories $ 15,433 $ 14,324