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Inventories (Tables)
12 Months Ended
Dec. 31, 2013
Inventory, Net [Abstract]  
Inventories
The following table summarizes our inventories at December 31, 2013 and 2012:
Millions of dollars
 
2013
 
2012
Finished products
 
$
1,950

 
$
1,948

Raw materials and work in process
 
622

 
596

 
 
2,572

 
2,544

Less: excess of FIFO cost over LIFO cost
 
(164
)
 
(190
)
Total inventories
 
$
2,408


$
2,354