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Inventories (Tables)
3 Months Ended
Mar. 31, 2014
Inventory, Net [Abstract]  
Schedule of Inventory
The following table summarizes our inventory for the periods presented:
Millions of dollars
 
March 31,
2014
 
December 31,
2013
Finished products
 
$
2,195

 
$
1,950

Raw materials and work in process
 
631

 
622

 
 
2,826

 
2,572

Less: excess of FIFO cost over LIFO cost
 
(160
)
 
(164
)
Total inventories
 
$
2,666


$
2,408