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Inventories (Tables)
9 Months Ended
Sep. 30, 2013
Inventory, Net [Abstract]  
Schedule of Inventory
The following table summarizes our inventory for the periods presented:
Millions of dollars
 
September 30,
2013
 
December 31,
2012
Finished products
 
$
2,197

 
$
1,948

Raw materials and work in process
 
639

 
596

Gross inventories
 
2,836

 
2,544

Less: excess of FIFO cost over LIFO cost
 
(169
)
 
(190
)
Total inventories
 
$
2,667


$
2,354