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Inventories (Tables)
 12 Months Ended
Dec. 31, 2014
Inventory, Net [Abstract]  
Inventories
The following table summarizes our inventories at December 31, 2014 and 2013:
Millions of dollars
 
2014
 
2013
Finished products
 
$
2,189

 
$
1,950

Raw materials and work in process
 
724

 
622

 
 
2,913

 
2,572

Less: excess of FIFO cost over LIFO cost
 
(173
)
 
(164
)
Total inventories
 
$
2,740


$
2,408