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Inventories (Tables)
 12 Months Ended
Dec. 31, 2015
Inventory, Net [Abstract]  
Summary of Inventories
The following table summarizes our inventories at December 31, 2015 and 2014:
Millions of dollars
 
2015
 
2014
Finished products
 
$
2,093

 
$
2,189

Raw materials and work in process
 
655

 
724

 
 
2,748

 
2,913

Less: excess of FIFO cost over LIFO cost
 
(129
)
 
(173
)
Total inventories
 
$
2,619


$
2,740