v2.4.0.6
Components of Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Inventory Disclosure [Abstract]    
Productive material, supplies and work in process $ 6,745 $ 6,486
Finished product, including service parts 9,099 7,838
Total inventories $ 15,844 $ 14,324