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Inventories
 12 Months Ended
Dec. 31, 2016
Inventory, Net [Abstract]  
Inventories
 INVENTORIES
The following table summarizes our inventories at December 31, 2016 and 2015:
Millions of dollars
 
2016
 
2015
Finished products
 
$
2,070

 
$
2,093

Raw materials and work in process
 
651

 
655

 
 
2,721

 
2,748

Less: excess of FIFO cost over LIFO cost
 
(98
)
 
(129
)
Total inventories
 
$
2,623


$
2,619


LIFO inventories represented 37% of total inventories at December 31, 2016 and 2015, respectively.