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Inventory (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 972 $ 922
Work-in-process 417 426
Finished goods 1,125 1,134
Inventory at FIFO 2,514 2,482
Excess of FIFO over LIFO cost (120) (133)
Total inventory $ 2,394 $ 2,349