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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Inventory    
Raw materials & field materials $ 2,300 $ 2,066 [1]
Work in process 368 364
Finished goods 2,450 2,270
Inventories $ 5,118 $ 4,700
[1]